Synthesis And Characterization Of Strontium Ferrite Environmental Sciences Essay

Strontium ferrite is a ferromagnetic stuff and reported as holding hexangular magnetoplumbite type ( M-type ) construction. It is the most widely used lasting magnets throughout the universe, which account for approximately 90wt % of the one-year production of lasting magnets. In this survey, the Sr ferrite is synthesized utilizing sol-gel methods and the magnetic belongingss were analyzed. Chapter 1 gave debut about the construction of M-type hexangular Sr ferrite. Besides, some general magnetic belongingss will be discussed. Commercial applications of Sr ferrite would be discussed every bit good. Chapter 2 is all about the experimental inside informations, including the man-made techniques used for Sr ferrite, description of instrument used and processs carried out. Chapter 3 concentrated on the consequences on magnetic susceptibleness of hexangular Sr ferrite. Comparison between Sr ferrite and cation-substituted Sr ferrite was made. Chapter 4 concluded the whole probe of this survey. Suggestions for future surveies were besides discussed. Better apprehension of the belongingss and practical applications of Sr ferrite can be achieved through this survey.AbstractionThe belongingss of magnetoplumbite type ( M-type ) hexangular Sr ferrite has been investigated. The effort of permutation of Co ( II ) oxide and Ti ( IV ) oxide in order to bring forth a quaternate system of the type SrO-Fe2O3-XO where Ten represents the dopant cation was made. The synthesis is based on sol-gel method where ethene ethanediol is the gel precursor. This technique was employed because it was found to be able to bring forth nanoparticles of cation substituted Sr ferrite. Furthermore, sol-gel method can bring forth high outputs of Sr ferrite atoms. Overall, the magnetic belongingss were observed to be alteration after the cation permutation. Co ( II ) -Ti ( IV ) permutation in SrFe12O19 with different ratios were made in this survey to look into the consequence of cation permutation in magnetic belongingss of Sr ferrite. Co ( II ) -Ti ( IV ) permutation in Sr ferrite with mole ratio of 0.4 showed the best magnetic belongingss that we desired for. The mass susceptibleness where X = 0.4 was found to be increase aggressively compared to the unsubstituted 1. Except the Co Ti permutation with mole ratio of 0.4, other cation permutation ratios showed lessening in mass susceptibleness which is non desirable. Therefore the cobalt-titanium permutation for SrCoxTixFe12-2xO19 with X = 0.4 is the best to better magnetic belongingss of Sr ferrite for assorted commercial applications. Reappraisal Strontium ferrite has been a topic of uninterrupted involvement and intensive survey for several decennaries due to the fact that this compound has been the the most widely used lasting magnets, which account for approximately 90wt % of the one-year production of lasting magnets since shortly after its find in the fiftiess. Strontium hexaferrite, SrFe12O19, is a ferrimagnet and is besides known as ceramic lasting magnet. When compared with alnico-magnets, Sr ferrite has high coercivity, moderate remenance, corrosion opposition and first-class chemical stableness [ 5 ] . Iron ( III ) oxide ( Fe2O3 ) is the chief constituents in SrFe12O19 which gives rise to its magnetic belongingss. Within the five different crystallographic sites of Sr ferrite, the Fe ions are coupled antiferromagnetically. Due to its high magnetocrystalline anisotropy field in its construction, SrFe12O19 exhibits high impregnation magnetisation and high coercivity [ 1 ] . The high magnetic permeableness in Sr ferrit e enables it to hive away strong magnetic Fieldss, which is stronger than Fe. Strontium ferrite is frequently produced as nanoscale size pulverization, which can be sintered into solid nucleuss. Strontium ferrite has been used for several of import industrial applications, such as lasting magnets, microwave devices and high denseness perpendicular entering media, with proper doping in order to better belongingss of Sr ferrite [ 1 ] . SrFe12O19 has besides been investigated as a medium for magnetic recording and magneto-optical recording and for long ( millimeter ) -wave devices [ 2 ] . Attempts have made to the development of fresh man-made methods which facilitate the production of all right hexangular ferrite atoms and to possible ways of cut downing their high intrinsic magnetocrystalline anisotropy. The aim in this survey was to try the synthesis of cation substituted M-type hexangular ferrite SrCoxTixFe12-2xO19 utilizing the sol-gel method. The sol-gel method has been used widely to bring forth all right atoms of a assortment of oxides. The consequence of doping Sr ferrite with Co ( II ) and Ti ( IV ) oxides to bring forth quaternate systems of SrO-Fe2O3-XO, where Ten represents the dopant cation would be tested. The all right atoms of cation substituted ferrite produced by utilizing sol-gel technique is desirable because the grain size of the stuffs used in magnetic recording is the chief factor finding the degree of background noise at low denseness. Magnetic belongingss of Sr ferrite would be focus in this survey. Magnetic susceptibleness balance would be used to find the mass susceptibleness for both strontium ferrite and cation-substituted Sr ferrite produced utilizing the sol-gel method. The mass susceptiblenesss of the samples were compared to find the optimal sum of cation needed to dope to ferrite to give the best magnetic behavior.CRYSTAL STRUCTURE OF M-TYPE HEXAGONAL SrFe12O19Harmonizing to crystalline construction, hexaferrite can be classified into four types, these include M, W, Y and Z types hexaferrites which correspond to ( SrO + MeO ) : Fe2O3 ratios of 1:6, 3:8, 4:6 and 5:12 severally. SrFe12O19 is classified as M-type hexaferrite. The hexangular SrFe12O19 was foremost prepared by AdelskA?old in 1938 [ 2 ] . He besides confirmed that the crystal construction of this compound to be iso-structural with the of course happening ferrite mineral magnetoplumbite, and hence it has the M-type construction. Subsequently structural polishs for Sr hexaferrite have confirmed his finding [ 2 ] . Strontium ferrite is classified as hexangular ferrite. It is denoted as holding the infinite group P63/mmc. Harmonizing to the research made by Kimura et Al, the lattice parametric quantities measured are found to be: a = 0.588 36nm and c = 2.303 76nm at room temperature [ 2 ] . As shown for M-type hexaferrite BaFe12O19 in Fig. 1.1, the crystalline constructions of different types of hexaferrites are unusually complex. The unit cell contains 10 O beds. A unit cell is consecutive constructed for four blocks, they are S ( spinel ) , R ( hexangular ) , S* and R* . The S and R blocks have tantamount atomic agreements and are rotated around the c-axis at 180A ° with regard to S* and R* blocks. Roentgen or R* block consists of three O2a?’A beds while S or S* block contains two O2a?’A beds ; with one O site in the in-between bed substituted by a Ba2+A ion [ 16 ] . The construction of Sr ferrite is similar to that of Ba ferrite, by merely replacing the Ba ion with strontium ion. Fig.A 1.1: A Structure of Ba hexaferrite Occasionally, a unit cell is comprises of two formula units. The unit cell consists of 64 ions per hexangular unit cell, which are 2 strontium ions, 38 O ions and 24 ferrous ions. The construction of magnetoplumbite are made of a bed of hexangular close jammed agreement of O and Sr ions, which is sandwiched between two spinal blocks incorporating a three-dimensional close-packed agreement of O atoms with Fe atoms. The Fe atoms are positioned at five interstitial crystallographically different cation sites of the close-packed beds, viz. 4f1 ( tetrahedral site, A sites ) , 12k, 4f2, 2a ( octahedral sites, B sites ) and 2b ( rhombohedral bipyramidal site ) [ 15 ] . The tetrahedral Fe oxide is FeO4, octahedral Fe oxide consists of six O ions, which is FeO6, and the expression for rhombohedral bipyramidal Fe oxide is FeO5. A conventional M-type structural representation and the five Fe3+ sites are shown in Fig. 1.2 by Collomb et Al. [ 15 ] . Figure 1.2: The crystal construction study map of the hexangular M-type stage and the five Fe sites with their milieus are displayed. The 2b sites merely occur in the same bed with strontium ion. 12k site is the octahedral site of S and R blocks. There are two tetrahedral ( 4f1 ) sites and one octahedral ( 2a ) site in Centre of S block. The two octahedral ( 4f2 ) sites are found in the R block, adjacent to the strontium-containing bed. The M-type construction of strontium ferrite gives rise to its magnetic belongingss. Cation permutation to strontium ferrite may give opportunities whereby changing the construction and therefore act upon the magnetic belongingss.MAGNETIC PROPERTIES OF M-TYPE HEXAGONAL SrFe12O19Strontium hexaferrite is a ferrimagnetic stuff. Since the free negatrons in SrFe12O19 are in close propinquity and remain aligned even the external magnetic field have been removed, it is able to retain a lasting magnetic field and is recognized as ferrimagnetic stuff. In 1950s Gorter predicted that the Fe ions at the rhombohedral bipyramidal ( 2b ) and octahedral ( 2a, 12k ) sites have their spin orientation antiparallel to that of the Fe ions at the 4f sites [ 2 ] . The antiparallel 4f1 and 4f2 and parallel 2a, 12k and 2b sublattices form the ferrimagnetic construction. The magnetic ordination corresponding to the magnetoplumbite construction of hexangular Sr ferrite is good illustrated in Fig. 1.3. In S block, the bulk I ±-sublattice consists of four octahedral ions and the minority I?-sublattice contains two tetrahedral ions whereas R block contributes three octahedral ions and one rhombohedral ion to the bulk sublattice and two octahedral ions to the minority sublattice. Figure 1.3: The conventional construction ( left ) of the SrFe12O19 with Gorter ‘s magnetic ordination ( in-between ) along the c-axis. The big unfastened circles are oxygen ions, the big broken circles are Sr ions ; little circles with a cross inside represent Fe ions at 12k, little circles incorporating a filled circle inside represent Fe ions at 4f2, little unfilled circles represent Fe ions at 4f1, filled little circles represent Fe ions at 2a and little circles with a unfilled circle inside represent Fe ions at 2b. The magnetic construction suggested by Gorter is shown on the right, where the pointers represent the way of spin polarisation. From Fig. 1.3, we can sum up the sites of Fe ( III ) ions matching to the spin way, as in Table 1.1. Site Coordination Occupancy Direction of spin polarisation 12k Octahedral 12 Up 2a Octahedral 2 Up 2b Trigonal Bypiramidal 2 Up 4f1 Tetrahedral 4 Down 4f2 Octahedral 4 Down Table 1.1: Fe ( III ) ion sites in M-type hexangular ferriteHysteresis LoopThe magnetic belongingss of Sr ferrite can be examined through hysteresis cringles. Hysteresis cringle can be measured utilizing instruments such as Vibrating Sample Magnetometer ( VSM ) and SQUID Magnetometry Measurements. When a magnetic stuff is placed in a magnetic field, the flux denseness ( B ) would dawdle behind the magnetising force ( H ) that causes it, and this signifier hysteresis cringle. From a hysteresis cringle, we can place the magnetic belongingss of the stuff, they are saturation magnetisation, remanence or besides known as remnant magnetisation, and coercivity. A typical hysteresis cringle is good illustrated in Fig. 1.4. Figure 1.4: Typical hysteresis cringle ( B-H curve ) Initially, there is no applied magnetic field and it is known as unmagnetized province. After magnetic field is applied, it causes alignment. Until maximal magnetising force applied, maximal flux denseness achieved at the same clip and this phenomenon is known as impregnation magnetisation. At this point, the maximal figure of spin has mobilized. Saturation magnetisation is defined as the maximal possible magnetization of a stuff. It is besides a step of strongest magnetic field a magnet can bring forth. The unit of impregnation magnetisation is in amperes per metre. Strontium ferrite is holding high impregnation magnetisation at which it can hive away high sum of magnetising force. As the magnetizing force being easy removed, the alliance stays at the point where H = 0, this is known as remnant magnetisation. Remnant magnetisation is the magnetisation left in a lasting magnet after an external magnetic field is removed. When a magnet is â€Å" magnetic † , it has remanence. I t is normally measured in unit Tesla. Strong lasting magnet such as Sr ferrite has high leftover magnetisation which means the high sum of magnetic force remains in it even after the magnetizing force is removed. As signifier Fig. 1.4, negative magnetic field is applied to demagnetise the lasting magnet. When the flux denseness ( B ) = 0, there is no magnetising force remain in the magnet and the negative H needed to demagnetise the magnet is known as coercivity. Negative H is the magnetic field applied in opposite way. Coercivity is measured in unit amperes per metre. Due to its high uniaxial magnetocrystalline anisotropy with an easy axis of magnetisation along the hexangular c-axis in the construction, SrFe12O19 has high coercivity. Anisotropy is directional or orientational effects in crystal construction of stuffs which can supply better magnetic public presentation along certain preferable axis. Therefore, we need to use high negative magnetising force to demagnetise Sr ferrite. Attempts have to be made to take down down the coercivity of Sr ferrite for use. Unit of measurements in Magnetism The units used in magnetic attraction can be divided chiefly into two classs, SI system and c.g.s system. The transition table shown in Table 1.2 is to clear up the magnetic attraction expression in both SI and c.g.s systems and the transition factors between them. Measure Symbol SI Unit SI Equation c.g.s Unit c.g.s Equation Conversion Factor Magnetic Initiation Bacillus tesla ( T ) B=A µo ( H+M ) gauss ( G ) B = H+4IˆM 1 T = 104A G Magnetic Field Strength Hydrogen ampere/meterA ( A/m ) H = NA-I/lcA ( lc – magneticA way, m ) oersted ( Oe ) H = 0.4IˆNA-I/lc ( lc – magneticA way, centimeter ) 1 A/m =A 4 IˆA-10-3A Oe Magnetic Flux I ¦ Wb ( Wb ) I ¦ = BA-Ac ( Ac – country, m2A ) Mx ( M ) I ¦ = BA-Ac ( Ac – country, cm2A ) 1 Wb = 108A M Magnetization Meter ampere/meter ( A/m ) M=m/V ( m- sum magnetic minute, A V- volume, m3A ) emu/cm3 M=m/V ( m- sum magnetic minute, A V- volume, cm3A ) 1 A/m = 10-3A electromagnetic unit / cm3 Magnetic Permeability of Vaccum A µo newton/ampere2 A µo= 4IˆA-10-7 1–4IˆA-10-7 Induction Liter H L=I?oI?N2Ac/lc ( Ac- country, M2, A lc – magnetic way, m ) H L=0.4IˆI?N2Ac/lcA-10-8 ( Ac-area, cm2, A lc – magnetic way, centimeter ) 1 Emf ( electromotive force ) Volt V V=-NA-dI ¦/dt V V=-10-8NA-dI ¦/dt 1 Note: In the above equations, I = current ( in As ) , N = bends Table 1.2: Magnetism expressions in SI and c.g.s systems and their transition factors for the magnetic units.1.4 PHOTOLUMINESCENCE PROPERTIES OF SrFe12O19Harmonizing to the survey of G. B. Teh et.al [ 3 ] on Sr ferrite, Sr ferrite was found to exhibit photoluminescence behaviour. When a sample of Sr ferrite is excited at a certain wavelength, highest strength of photoluminescence emanation extremums was obtained. The ability of Sr ferrite to photoluminesce could be due to the O vacancies in their lattice construction. The O vacancies are assumed to do the atoms to exhibit photoluminescence behaviour by moving as traps for nomadic excitement. The O vacancies have effectual +2 charges, doing them powerful electron gaining control centres. Valence negatron would derive sufficient energy to leap from the valency set to the conductivity set and go forthing a spread known as hole during excitement. F-centers, which is the part where contain high sum of negatrons would organize when the aro used negatrons being trapped in O vacancies. These rich negatron centres would take to emanation of luminescence when the holes and negatrons recombine.1.5 SYNTHESIS ROUTE OF SrFe12O19The processing paths used for synthesis of Sr ferrite affect its belongingss much. Traditionally, this ferrite pulverization is synthesized by a assorted oxide ceramic method, which involves the solid-state reaction between SrCO3 and Fe2O3 at a high calcination temperature ( about 1300A °C ) . However, uncontrolled atom morphology, larger atom size and agglomerates would be the biggest disadvantages of this technique. Besides, taint would be introduced to the sample while subsequent milling of the calcined ferrite pulverization and this would impact the magnetic belongingss become less desirable. Therefore, the narrowed atom size distribution, refined atom size and minimum atom agglomeration has been the chief concern during the synthesis of Sr ferrite. In order to better the magnetic belongingss, legion nonconventional soft man-made paths have been carried out, including sol-gel synthesis [ 3 ] , hydrothermal reaction [ 6 ] , co-precipitation [ 7 ] , citric acid method [ 8 ] and microemulsion processing [ 10 ] . In this survey, the synthesis of Sr ferrite employed the sol-gel technique. It is a wet chemical path using ethylene ethanediol as gel precursor. Sol-gel technique is the technique of utilizing chemical substances which have high solubility in organic dissolvers to synthesise precursor compounds. The compounds are easy transformed into hydrated oxides on hydrolysis. The metal alkoxides formed can be removed easy utilizing hydrolysis and thermic intervention and therefore consequences in hydrous oxides which are extremely purify. Sol-gel method is used in this survey because of its many advantages. Sol-gel technique is able to bring forth homogenous nanosized crystallites. This method is tend to give molded stuffs straight from a solution without go throughing through the pulverization processing and the fact that the annealing temperature is really low compared with other conventional engineering. The crystalline size and belongingss of the ferrite produced are mostly affected by calcinations temperature [ 3 ] . Sol gel method has the advantage that the crystal growing of atoms is easier to command by changing the heat intervention [ 11 ] . It was reported that at 500EsC it produced merely maghemite, I?-Fe2O3. A assorted merchandise of magnetic I ±-Fe2O3 and M-type SrFe12O19 were obtained at 600EsC. As the calcination temperature addition to 800EsC and supra, there are merely M-type SrFe12O19 stage was observed. Sol-gel synthesis is able to bring forth high outputs of SrFe12O19 nanoparticles. It is besides able to bring forth nanocrystallite of cation substituted SrFe12O19. Nanoparticle size of Sr ferrite is desirable and aimed to synthesise because nanoparticles tend to give better magnetic belongingss. Nanoparticles give few magnetic spheres, likely individual sphere. Single sphere tends to give higher magnetic initiation because there are no oppose magnetic sphere. Single sphere aligns in one way merely. These belongingss are ideal for the devising of lasting magnet.1.6 CATION SUBSTITUTION IN SrFe12O19In order to better the magnetic belongingss of Sr ferrite, many surveies have been carried out. One of them is cation permutation in Sr ferrite. Rare Earth and other metal cations are used for permutation for Sr and Fe severally [ 5 ] . The brace doping of SrFe12O19 such as a La-Co brace to replace a Sr-Fe brace has been tested [ 14 ] . The doping, or known as cation permutation, is aim to better the magnetic belongingss of Sr ferrite. Cation permutation consequences in structural al terations in Sr ferrite. As the physical belongingss of ferrite alteration, the magnetic belongingss would be affected due to the fact that magnetic belongingss are determined by the agreement of Fe ions in crystal construction. In this survey, Co-Ti brace will be doped to the Sr ferrite. Cobalt Ti permutation will bring forth a quaternate system of the type SrO-Fe2O3-AO where A represents the dopant cation.The Co Ti permutation gives rise to the new expression, SrCoxTixFe12-2xO19 where Ten is the figure of mole of cation substituted in.1.7 Commercial ApplicationsStrontium ferrite is widely used as lasting magnet because it has way of easy magnetisation and the hexangular c-axis which are perpendicular to the plane of the home base. The belongingss that are desirable in utilizing as lasting magnet include high impregnation magnetisation, high leftover magnetisation, high coercivity, high Curie temperature and high magnetocrystalline anisotropy. Besides, SrFe12O19 is besides normally used in high-density informations storage magnetic entering media. Nanoparticles of SrFe12O19 with individual sphere and low coercivity are important in used for magnetic recording media. M-type Sr ferrite nanoparticles have attracted much attending due to their good frequence characteristic, low noise, high end product, in peculiar, first-class high frequence characteristic and broad dynamic frequence scope [ 4 ] . There are two types of entering medium, viz. particulates and thin movies. Tape and floppy is categorized in particulate and difficult thrust is belongs to thin movie. Information is stored by magnetising stuff. The entering caput can use magnetic field ( H ) and align spheres to magnetise the medium. It can besides observe a alteration in the magnetisation of the medium. Magnetic entering media prefers high impregnation magnetisation ; do it to hive away as much information. High value of remnant magnetisation is required in enterin g media to do certain that all stuffs stored in the difficult disc still remained even the power supply ( applied magnetic field ) is switched away. Low coercivity is of import in magnetic recording media. When the positive magnetic field is applied, this charging manages the medium to hive away informations. On the other manus, negative magnetic field applied to recover back the information, this is called discharges. Therefore, less current is needed to recover the information in the low coercivity medium. As a consequence, less heat generated and this saves the electricity. In general, Sr ferrite has high value of uniaxial anisotropy field, high coercive force and high impregnation magnetisation. The high coercivity of Sr ferrite has to be lowered down and impregnation magnetisation has to be at the same time increased if it is to be utile for magnetic recording intents. It has been reported that the permutation of cations such as Co ( II ) for the ion Fe ( III ) in Sr ferrite has lowered the coercive force. Therefore, many surveies were carried out to accomplish better magnetic belongingss of Sr ferrite for commercial applications.Chapter 2: EXPERIMENTALSample PreparationSynthesis of M-type SrFe12O19 Synthesis of Cation Substituted SrFe12O19Sample CharacterizationMagnetic Susceptibility Balance MK12.1 Sample Preparation2.1.1 Synthesis of M-type SrFe12O19The sol-gel technique was used to synthesise M-type SrFe12O19 whereby the ethene ethanediol acts as gel precursor. The starting stuffs, Sr nitrate, Sr ( NO3 ) 2 and Fe ( III ) nitrate-9-hydrates, Fe ( NO3 ) 3A ·9H2O were used due to their high solubility in ethylene ethanediol. Calculation below was made to find the weight of stuffs needed to be used. Relative Molecular Mass of stuffs: Strontium nitrate, Sr ( NO3 ) 2 = 211.63 g/mol Iron ( III ) nitrate-9-hydrates, Fe ( NO3 ) 3A ·9H2O = 404 g/mol ( Note: All replies have to be converted into 3 important figures. ) No. of mol of 1 g Sr ( NO3 ) 2 = Mass of Sr ( NO3 ) 2 RMM of Sr ( NO3 ) 2 = 1g 211.63g/mol = 4.7252Ãâ€"10-3 mol Strontium: Fe = 1: 12 No. of mol of Fe ( NO3 ) 3A ·9H2O needed = 4.7252Ãâ€"10-3 mol x 12 = 5.6702Ãâ€"10-2 mol Mass of Fe ( NO3 ) 3A ·9H2O needed = No. of mol of Fe ( NO3 ) 3A ·9H2O needed ten RMM of Fe ( NO3 ) 3A ·9H2O = 5.6702Ãâ€"10-2 mol x 404g/mol = 22.9 g From the computation, 1g of Sr nitrate and 22.9g of Fe ( III ) nitrate-9-hydrates were needed in the synthesis and were weighted. Strontium nitrate would supply 1 mol of Sr ions and Fe ( III ) nitrate-9-hydrates would supply 12 mol of Fe ions in the synthesis of Sr ferrite, which matched the molecular expression of SrFe12O19. The Sr nitrate and Fe ( III ) nitrate-9-hydrates were readily dissolved in ethene ethanediol with little heat applied due to their high solubility in it. The mixture was heated somewhat and stirred with a magnetic saloon until the mixture was to the full dissolved. The attendant solution is in crystalline ruddy colour. The magnetic stirring saloon was removed. The mixture was heated to 100A °C and it would easy transform into a gel signifier. The gel was dried with uninterrupted heating at 100A °C for 3 hours. The dried gel was so transferred to a crucible to take hints of organic precursor. A mixture of metal oxides in spread nanoclusters signifier was obtained. The dried gel was so annealed in a furnace at 800A °C for 3 yearss with extended land with a stamp in a howitzer after annealed at interval of each twenty-four hours.2.1.2 Synthesis of Cation Substituted SrFe12O19Cation substituted strontium ferrite was synthesized by utilizing Co ( II ) ions and Ti ( IV ) ions to replace the Fe ions in M-type hexangular Sr ferrite. The permutation of Co ( II ) and Ti ( IV ) gives the compound a new molecular expression, which is SrCoxTixFe12-2xO19 where the x denoted different ratios. In the synthesis of cation substituted SrFe12O19, the ratios of cations used, x, is in between 0.2 to 6.0 ( 0.2 a†°Ã‚ ¤ x a†°Ã‚ ¤ 6.0 ) , where ten = 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0. The same method described in subdivision 2.1.1 was used for the synthesis, by merely adding two new get downing stuffs, which are the Co ( II ) nitrate and Ti ( IV ) ethoxide to give the Co2+ and Ti4+ cations. Calculation as described below was made to cipher the weight of stuffs needed severally. Relative Molecular Mass of stuffs: Strontium nitrate, Sr ( NO3 ) 2 = 211.63 g/mol Iron ( III ) nitrate-9-hydrates, Fe ( NO3 ) 3A ·9H2O = 404 g/mol Cobalt ( II ) nitrate, Co ( NO3 ) 2.6H2O = 291.04 g/mol Titanium ( IV ) ethoxide, Ti ( CC2H5 ) 4 = 228.11 g/mol ( Note: All replies have to be converted into 3 important figures. ) Examples used for the computation: SrCo0.2Ti0.2Fe11.6O19, x= 0.2 No. of mol of 1 g Ti ( CC2H5 ) 4 = Mass of Ti ( CC2H5 ) 4 RMM of Ti ( CC2H5 ) 4 = 1g 228.11g/mol = 4.3838Ãâ€"10-3 mol 0.2 mol of Ti needed 1 mol of Sr. 4.3838Ãâ€"10-3 mol of Ti needed ( 4.3838Ãâ€"10-3 mol x 1 ) mol of Sr. 0.2 Therefore, 0.021919 mol of Sr is needed. Mass of Sr ( NO3 ) 2 needed = 0.021919mol ten 211.63 g/mol = 4.64 g 0.2 mol of Ti needed 11.6 mol of Fe. 4.3838Ãâ€"10-3 mol of Ti needed ( 4.3838Ãâ€"10-3 mol x 11.6 ) mol of Sr. 0.2 Therefore, 0.25426 mol of Fe is needed. Mass of Fe ( NO3 ) 3A ·9H2O needed = 0.25426mol ten 404g/mol = 103 g Mass of Co ( NO3 ) 2.6H2O needed = 4.3838Ãâ€"10-3 mol x 291.04g/mol = 1.28 g The computation above were used to cipher the weight of get downing stuffs needed for other cation ratios, ten for 0.4, 0.6, 0.8, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 severally every bit good. The weight needed for each stuff was tabulated in Table 2.1. ten Weight of stuffs needed ( g ) Sr ( NO3 ) 2 Fe ( NO3 ) 3A ·9H2O Co ( NO3 ) 2.6H2O 0.2 4.64 103 1.28 0.4 2.32 51.4 1.28 0.6 1.55 31.9 1.28 0.8 1.11 23.0 1.28 1.0 0.93 17.7 1.28 2.0 0.46 7.08 1.28 3.0 0.31 3.54 1.28 4.0 0.23 1.77 1.28 5.0 0.19 0.71 1.28 6.0 0.15 0.00 1.28 Table 2.1: Weight of stuffs needed for synthesis of Co ( II ) -Ti ( IV ) substituted Sr ferrite For the series of different permutation ratios ( ten ) , the corresponding Sr nitrate, Fe ( III ) nitrate-9-hydrates, Co ( II ) nitrate and Ti ( IV ) ethoxide were weighed and dissolved in 100ml ethene ethanediol. The oxides obtained after ignition were so annealed in a furnace at 800A °C for 3 yearss with extended land with a stamp in a howitzer after annealed at interval of each twenty-four hours. The readying for Sr ferrite and cation substituted strontium ferrite is shown in Fig. 2.1 in flow chart array. Figure 2.1: Conventional diagram of the process for synthesis of Sr ferrite and cobalt-titanium substituted SrFe12O19.Sample CharacterizationMagnetic Susceptibility Balance MK1The magnetic belongingss of Sr ferrite and cobalt-titanium substituted Sr ferrite produced by the method described above were examined utilizing the Magnetic Susceptibility Balance MARK 1 ( MK1 ) by Sherwood Scientific Ltd, England. The magnetic susceptibleness balance setup was shown in Fig. 2.2. Figure 2.2: Magnetic Susceptibility Balance MK1 by Sherwood Scientific Ltd, England. The basic design rule of Magnetic Susceptibility Balance MK1 was shown in Figure 2.3. Magnetic Susceptibility Balance determines the magnetic belongingss by puting two twosome of traveling magnets with the beam in between where the stationary sample is ready to be measured. Basically, the possible warp in the beam and the motion being made of a peculiar sample either solid or liquid could be observed in a balanced system which possesses a magnetic field. Meanwhile, the spiral within the instrument is conducted with current required in order to do compensation of the magnetic force produced by the sample. Either paramagnetic or diamagnetic could be resolved in a asset or minus comparatively on show with the assistance of the way that the beam Swift. Figure 2.3: Basic design rule of Magnetic Susceptibility Balance MK1 by Sherwood Scientific Ltd, England. Magnetic susceptibleness is defined as when the magnetising field is applied to the sample, how much is the ratio of the strength of magnetic attraction induced by the sample in response to the magnetising field which it is capable. In this experiment, mass susceptibleness was the chief concern. Mass susceptibleness, xg, is defines by the mathematical expression below: ?‘?g= ‘?v/d Where vitamin D = denseness of substance ?‘?v is the volume susceptibleness, calculated by utilizing the expression: ?‘?v = I/H Where I = strength of magnetic attraction produced in a substance H = strength of applied magnetic field Based on the magnetic belongingss of magnetic substances, they can be classified into one of the three groups. Among them, there is paramagnetic stuff which would pull by a strong magnetic field, diamagnetic which repelled by magnetic field and ferromagnetic which is alone to retain their ain magnetic field. After the external magnetic field is removed, ferromagnetic stuffs are still able to retain a lasting magnetic field. This is happened due to their free negatrons are in close propinquity and remain aligned without the magnetic field. Strontium ferrite and cobalt-titanium substituted Sr ferrite were found to be ferromagnetic due to the overshooting value observed on the show when the samples were introduced. To get the better of this job, a non-magnetic stuff Na chloride, was used to ‘dilute ‘ the big magnetic attraction induced by the samples. Procedure was carried out. First, the scope boss of Magnetic Susceptibility Balance MK1 was turned to the x1 graduated table and was allowed to warm up for 10 proceedingss before usage. The nothing boss is adjusted until the show reads 000. An empty sample tubing of known weight was placed into the tubing usher and the reading, Ro was taken. 0.0005g sample + 0.2820g NaCl ( sample length, fifty =3cm ) was packed into the sample column. The weight of samples and Na chloride were fixed for all measurings made. The jammed sample tubing was placed into tubing usher and the reading, R was taken. The stairss were repeated for all the 11 samples. The mass susceptibleness, ‘?g is calculated utilizing the expression: ?‘?g= CBal* cubic decimeter * ( R-Ro ) 109 * m Where: cubic decimeter = length of sample ( centimeter ) m = mass of sample ( gm ) R = balance reading for sample + tubing Ro = balance reading for empty tubing CBal = the balance standardization changeless ( =1 )Chapter 3: Consequence AND DISCUSSION3.1 Consequences of Mass Susceptibility3.1.1 Mass susceptibleness of M-type SrFe12O19 3.1.2 Mass susceptibleness of Cation Substituted SrFe12O19 3.1.3 Table of mass susceptibleness of SrFe12O19 and Co ( II ) -Ti ( IV ) substituted SrFe12O19 3.1.4 Graph of mass susceptibleness, ‘?g ( cgs ) against Co ( II ) -Ti ( IV ) ratio3.2 Findingss and Discussion3.1 RESULTS OF MASS SUSCEPTIBILITYMass susceptiblenesss of the samples were calculated utilizing the expression: ?‘?g= CBal* cubic decimeter * ( R-Ro ) 109 * m Where: cubic decimeter = sample length ( centimeter ) m = sample mass ( gm ) R = balance reading for sample in tubing Ro = balance reading for empty tubing CBal = the balance standardization changeless ( =1 ) * All the replies are adjusted to 4 important figures.3.1.1 Mass Susceptibility of M-type SrFe12O19?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 936- ( -036 ) ] 109 x 0.0005 = 1.944Ãâ€"10-43.1.2 Mass Susceptibility of Cation Substituted SrFe12O19SrCo0.2Ti0.2Fe11.6O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 798- ( -036 ) ] 109 x 0.0005 = 1.668Ãâ€"10-4 SrCo0.4Ti0.4Fe11.2O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 671- ( -036 ) ] 109 x 0.0005 = 1.414Ãâ€"10-4 SrCo0.6Ti0.6Fe10.8O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 654- ( -036 ) ] 109 x 0.0005 = 1.380Ãâ€"10-4 SrCo0.8Ti0.8Fe10.4O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 542- ( -036 ) ] 109 x 0.0005 = 1.156Ãâ€"10-4 SrCo1.0Ti1.0Fe10O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 441- ( -036 ) ] 109 x 0.0005 = 0.954Ãâ€"10-4 SrCo2.0Ti2.0Fe8O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 236- ( -036 ) ] 109 x 0.0005 = 0.544Ãâ€"10-4 SrCo3.0Ti3.0Fe6O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 162- ( -036 ) ] 109 x 0.0005 = 0.396Ãâ€"10-4 SrCo4.0Ti4.0Fe4O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ 145- ( -036 ) ] 109 x 0.0005 = 0.362Ãâ€"10-4 SrCo5.0Ti5.0Fe2O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ -006- ( -036 ) ] 109 x 0.0005 = 0.060Ãâ€"10-4 SrCo6.0Ti6.0O19 ?‘?g = CBal* cubic decimeter * ( R-Ro ) 109 * m = 1 ten 3cm ten [ -066- ( -036 ) ] 109 x 0.0005 = -0.060Ãâ€"10-43.1.3 Table of mass susceptibleness of SrFe12O19 and Co ( II ) -Ti ( IV ) substituted SrFe12O19The mass susceptiblenesss of the samples calculated were summarized in Table 1. Samples Sample length, cubic decimeter ( centimeter ) Sample mass, m ( gm ) Empty tubing reading, R0 Reading for tubing + sample, R Mass susceptibleness, xg SrFe12O19 0.1 0.0005 -036 936 1.944Ãâ€"10-4 SrCo0.2Ti0.2Fe11.6O19 0.1 0.0005 -036 798 1.668Ãâ€"10-4 SrCo0.4Ti0.4Fe11.2O19 0.1 0.0005 -036 671 1.414Ãâ€"10-4 SrCo0.6Ti0.6Fe10.8O19 0.1 0.0005 -036 654 1.380Ãâ€"10-4 SrCo0.8Ti0.8Fe10.4O19 0.1 0.0005 -036 542 1.156Ãâ€"10-4 SrCo1.0Ti1.0Fe10O19 0.1 0.0005 -036 441 0.954Ãâ€"10-4 SrCo2.0Ti2.0Fe8O19 0.1 0.0005 -036 236 0.544Ãâ€"10-4 SrCo3.0Ti3.0Fe6O19 0.1 0.0005 -036 162 0.396Ãâ€"10-4 SrCo4.0Ti4.0Fe4O19 0.1 0.0005 -036 145 0.362Ãâ€"10-4 SrCo5.0Ti5.0Fe2O19 0.1 0.0005 -036 -006 0.060Ãâ€"10-4 SrCo6.0Ti6.0O19 0.1 0.0005 -036 -066 -0.060Ãâ€"10-4 Table 3.1: Mass susceptibleness, xg of SrFe12O19 and Co ( II ) -Ti ( IV ) substituted SrFe12O193.1.4 Graph of mass susceptibleness, ‘?g ( cgs ) against Co ( II ) -Ti ( IV ) ratioA graph of mass susceptibleness of SrFe12O19 and Co ( II ) -Ti ( IV ) substituted SrFe12O19 against Co ( II ) -Ti ( IV ) ratio was plotted and shown in Graph 3.1. Figure 3.1: Graph of mass susceptibleness, ‘?g ( cgs ) against Co ( II ) -Ti ( IV ) ratio3.2 FINDINGS AND DISCUSSIONMagnetic susceptibleness is a step of response of negatrons in sample to an applied magnetic field. Electrons produce magnetic minutes at where the negatrons spin circularly around the karyon following right-thumb regulation. The net magmetic minute is the amount of minutes from all negatrons. There are three types of magnetic attraction ; they are ferromagnetic or ferrimagnetic, paramagnetic and diamagnetic. Strontium ferrite is a ferrimagnetic compound due to its high magnetic initiation, B when magnetic field, H is applied. The magnetic minutes of ferrimagnetic Sr ferrite is aligned parallel with applied magnetic field. It is a of course magnet because the magnetic minutes are point at one way even there is no magnetic field is applied. The magnetic minute of M-type hexangular ferrites strongly prefer the hexangular axis way, which is the c-axis. Within the grain boundaries of ferrimagnetic atoms, the spheres are aligned in two waies opposing when there is no magnetic field applied. As the magnetic field is applied and strength of applied field ( H ) increases, the magnetic minute of ferrimagnetic stuff become aligns with H. The magnetic spheres with aligned magnetic minute grow at disbursal of ill aligned 1s. In the terminal, the magnetic spheres become individual sphere when the applied magnetic field additions until a point. Single magnetic sphere is desirable as it is easy to revolve the atoms for use. Single sphere besides gives higher magnetic initiation because there are no oppose magnetic sphere, the individual sphere align in one way merely. These belongingss are ideal for doing of lasting magnet. To a higher opportunity of obtaining individual sphere in atoms of a compound, the compound frequently produced in nanoparticles. Nanoparticles tend to give few magnetic spheres, likely individual sphere. This is due to the really little size of atoms tend to give the smallest sum of grain boundary, hence the opportunity of acquiring magnetic spheres in opposite way is little comparison to the big size atoms which have more grain boundaries. Therefore in this survey, sol-gel technique which is able to bring forth nano-sized atoms was employed. The magnetic belongingss of the hexangular Sr ferrites are strongly dependent upon the synthesis conditions and the site penchant of the substituted cations among the five different Fe3+ sublattices viz. , tetrahedral ( 4f1 ) , rhombohedral bipyramidal ( 2b ) and octahedral ( 12k, 2a and 4f2 ) of hexangular construction [ 13 ] . Mass susceptibleness is the ratio of the strength of magnetic attraction induced in the sample to the magnetizing field applied in response to the denseness of the substance. In commercial application, the mass susceptibleness is desirable as holding high value, for the use of strong lasting magnet and entering media. For the composing where x = 0.2, the substituted Sr ferrite recorded lessening in mass susceptibleness. The magnetic belongingss were non every bit desirable as the value of susceptibleness demands to be comparatively high. In the specimen with x = 0.4, a dramatically addition in mass susceptibleness was measured. The addition in susceptibleness indicated that the permutation of Co ( II ) -Ti ( IV ) had filled up the minor I?-sublattice ( spin-down ) of the magnetoplumbite construction and therefore enhanced the measured magnetization along the I ±-sublattice ( spin-up ) axis. In the specimen with x = 0.6, the mass susceptibleness decreased. The big lessening of susceptibleness indicated that at this ratio, the Co ( II ) -Ti ( IV ) cations may good hold occupied the cation sites which were in the I ±-sublattice ( spin-up ) . For x = 0.8 to 5.0, it was found that both specimens recorded similar values of susceptibleness. As the permutation of Co ( II ) -Ti ( IV ) increased, the susceptibleness showed a rapid lessening. It might hence be expected that farther permutation will later bring forth a superparamagnetic-like Sr ferrite. Superparamagnetism is a phenomenon by which magnetic stuffs may exhibit a behaviour similar to paramagnetism at temperatures below the Curie temperature. For x = 6.0 shows negative value of mass susceptibleness, indicates the formation of Co oxide and Ti dioxide which are diamagnetic. There are no Fe oxides which gives ferromagnetic belongingss. From the old published survey, the partial permutation of Fe3+ ions with a Co2+ + Ti4+ brace was attempted [ 4 ] . However, the coercive force reduces and at the same time impregnation magnetisation besides reduces. Therefore, the ratio of substituted cations is really of import in modifying the magnetic belongingss of ferrite. Single sphere atoms of Ti-Co substituted M-type hexaferrite posses attractive belongingss for the recording media applications [ 13 ] . Such permutations at Fe site are effectual in cut downing the coercivity and magnetocrystalline anisotropy but require higher annealing temperature for the individual stage formation. It has besides been reported that when synthesising Ti-Co substituted hexaferrites, it is hard to avoid the formation of Co ferrite. Although the coercivity lessening by the permutation of Co-Ni but at the same clip the impregnation magnetisation of the stuffs lessening which limit their applications in the high denseness entering media.Chapter 4: Decisions4.1 Decisions4.2 Future Work4.1 DecisionThe consequence of cation permutation on magnetic belongingss of Sr ferrite is discussed in the old chapter. The magnetic belongingss are differing matching to the different cation permutation ratios. There existed important tendency which corresponded to the alterations in perm utation ratio in Sr ferrite. The mass susceptibleness is the highest at x = 0.4 in SrCoxTixFe12-2xO19. This indicates that this cation permutation ratio gives best magnetic behavior where the magnetisation is the highest. This phenomenon is favorable for commercial application such as doing of lasting magnet and magnetic recording media.4.2 FUTURE WORKIn this survey, the magnetic belongingss of M-type hexangular SrFe12O19 and cation substituted SrFe12O19 was studied. One of the magnetic belongingss, mass susceptibleness of the ferrites was determined in this survey, by utilizing magnetic susceptibleness balance. Besides magnetic susceptibleness balance, the survey on magnetic belongingss can be improved by utilizing SQUID gaussmeter or vibrating sample gaussmeter ( VSM ) [ 12 ] to look into the impregnation magnetization, remnant magnetization and coercivity. These three magnetic belongingss are the indispensable one to find their magnetic behavior for assorted applications. However , these two instruments are non available in our research lab. The cobalt-titanium permutation is replacing the Fe sites alternatively of Sr sites. The Sr site could be substituted with other passage elements or rare earth elements with the similar atomic radii, illustration for Bi and rare earth. In future, farther survey could be carried out by substituted rare earth wholly to replace strontium ferrite to look into whether the M-type hexangular construction remains. One of the ways to heighten magnetic belongingss is to bring forth individual sphere atoms by partner offing the divalent-tetravalent permutation in Sr ferrite with appropriate man-made methods. Besides cation permutation by Co2+-Ti4+ brace, sol gel derived strontium ferrite with Fe substituted by Zn2+ , Ti4+ and Ir4+ have been carried out [ 9 ] . They are Zn2+-Ti4+ brace and Zn2+-Ir4+ brace. If this is true, it will hold a great impact on the engineering of tomorrow.

Tree Disks and the Cross-Sections of Tree Limbs, Trunks

For those of you who dont know what a tree cookie is, a  tree cookie is a sliced portion of a tree trunk or limb that can show each and every annual ring on a viewable plane. A tree cross-section disk or cookie can be one of the best botanical teaching aids to kids and adults on things happening in a tree and environmental effects on trees. It is especially effective visually in conifer specimens and more specifically pine. Finding the Perfect Tree Cookie Selecting a tree species that shows well is important when showing annual ring structure. Species that display visible dark annual rings are pines, spruces, cedar, and firs. Conifers used as Christmas trees are great for this if you use a real tree over the holiday. The wood is soft, easy to cut, and sand, and always displays nice rings. Deciduous or broad-leaved trees can show nice rings by cutting their thick faster-growing branches (that also contain annual rings). Best trees for branch collections are oaks, ashes, maples, elms, cherry, and walnut. Trunk slices from these trees are often too large for display where rings are usually too tight and light to easily count. The best tool for quickly felling a small tree is the standard curved large tooth pruning saw. A pruning saw will make quick work on a small trees base or when cutting larger branches. At this point, you need to make a decision on whether to cut the cookies without drying or dry larger poles for cutting cross-sections later. These poles should be cut into four-foot segments with no end less than 2 inches in diameter. The ideal slice size for quick production and use for a classroom is about the diameter of a soda can. Slice the logs into cookie segments between 1 to 2 inches thick. Use the same pruning saw or, for a fine surface, use a motor-driven saw such as a radial arm saw. Drying Logs in a Kiln or Under Sheltered Storage Kiln-drying short poles can be a more involved step to carry out but make for a much better tree slice specimen. A sawmill yard supervisor can dry your tree cookie logs in days using their lumber kiln. These logs will be sufficiently dry, feel much lighter and easier to cut with little to no chance of cracking. If you have time and a space you can set the logs in a dry, well-ventilated place for about a year. Drying Cookies From Green Trees Drying cookies cut from green trees is critical. If the sections are not dried properly, they will attract mold and fungus and lose bark. Store your cut cookies in a dry, well-ventilated surface under low humidity for three to ten days. Turn them over daily to allow both sides to dry. Placing them on a driveway on a sunny day also works. Cracking is a major problem if the cookie is not dried over sufficient time with adequate ventilation. Getting the perfect â€Å"uncracked† cookie is a challenge, and the best way to prevent cracking is to cut cookies from a dried, not green, log or branch. Remember that the smaller the cookie, the less likely cracking will occur. Try cutting cookies from dried limbs, as the grain is often tighter in the limbs than in the main stem. Curing Cookies Using PEG Good preserving with less cracking results when you soak fresh-cut green cookies in polyethylene glycol (PEG). PEG draws the water out and replaces it with the PEG, which is a waxy material with excellent wood stabilizing properties. It also is not cheap and should be used primarily for your best specimens. The disks from fresh-cut wood should be wrapped in plastic or immersed in water to keep in green condition until they can be treated. The PEG soaking time to obtain sufficient penetration against splitting and checking depends on the solution, the size, and thickness of the disks, and the species of wood. One month is usually sufficient soaking time and there is a drying time also associated.

John Keat s Line, Beauty Is Truth, Truth Beauty - 1568 Words

When it comes to media humanity and society mass consume, things that could also be considered artistic like movies, music, books, and so on, media seems to like the message that truth is†¦ solid. That truth is, in a way other things are not. That truth is concrete and that if we work and search, we will find the truth and all our questions will be answered. More ‘artsy’ art, things like paintings, poetry, sculptures, music, and such, seem to very much disagree. Truth becomes an almost illusory concept, searched for, aspired to, but never fully grasped. I believe John Keat’s line â€Å"Beauty is truth, truth beauty† echoes this notion. By linking the concept of truth with a concept that seems different to every person in existence and the†¦show more content†¦Some of the first thoughts of art, and its use or place in society, was through Plato’s presentation of Socrates in various dialogues. In such, he believed Art isn’t needed. Even more so, Art is detrimental. It has no place in the ordered society because it incites views and thoughts that aren’t philosophical or rational at all, but also because all art does is show copies of the world around us, which is itself only a copy of the Forms. We don’t see the truth around us, we don’t even see reality. Art, then, could never give us the truth because we have no earthly idea what that is. We have no sense perception of what truth is, and never can. Beauty seems to have no place in a logic oriented society either, especially as something that could inspire emotions in people, instead of letting them focus on philosophy. (Wartenberg 13) Almost 2,000 years later, David Hume asks if there are any sorts of standards we could use to decide if a work of art is good or bad. No matter what those in the past may have believed best, art stuck around and grew into an almost living thing that no one knew quite what to do with. Was it entertainment? D id it have value? How could we judge that value, when no one seems able to agree on how they feel about any specific piece in the first place? Hume saw the strange contradiction in how a majority of people could somehow agree on oneShow MoreRelatedAnalysis Of The Poem Ode On A Grecian Urn 866 Words   |  4 PagesIn the year of 1819, John Keats, the last of the Romantic poets, was diagnosed with tuberculosis, which he contracted from attempting to nurse his brother back to heath. Alongside the knowledge that his death was surely upon him, Keats published his most distinguished works in that same year. â€Å"Ode to a Grecian Urn† was one of five Odes Keats wrote. In this poem, John Keats uses his theory of negative capability to embody his attitude towards the Grecian Urn, thus further explaining the poet’s universalRead MoreAnalysis Of John Keats1078 Words   |  5 PagesThe Different Perspective (A Discussion on messages in John Keats poems.) John Keats was a poet in the 1800’s who was way ahead of his time. 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Impact Of The Atomic Bombs On Nagasaki And Hiroshima

The impact of the atomic bombs on Nagasaki and Hiroshima were the most destructive singular air strikes against Japan. However, fire raids conducted by Major General Curtis E. Lemay were a significant factor in the air campaign against Japan. They also inflicted more casualties to the Japanese populous and damage to Japanese infrastructure than the atomic bombs (Hanson 60). The decision and execution of these attacks by General Lemay contributed to the overall success of the pacific campaign. The changes that General Lemay made to the XXI Bomber Command created more victories for the Americans with a lower casualty rate. These victories can also be attributed to the success of air power at the tactical, operational, and strategic levels of war. Prior to General Lemay’s control of the XXI Bomber Command, Brigadier General Haywood S. Hansell Jr. was conducting high altitude bombing campaigns on Japanese infrastructure. The bombing command had a solid foundation with its safe base infrastructure, tactics, and organization of command. B-29s stationed at bases in Guam, Tinian, Saipan and Iwo Jima were being more well-constructed leading to less problems during air raids. With better aircraft, missions could have fewer issues occurring leading to higher success rates. The major setback that aircrafts were having was the weather. Because the bombers were at such high altitudes during their attacks it led to overheating of engines and other mission essential issues. ThunderstormsShow MoreRelatedHiroshima, Japan, And Japan1352 Words   |  6 PagesAnswers Who: Hiroshima, Japan and Nagasaki, Japan Leader of Japan: Hideki Tojo, Minister of war Leader of United States: General Douglas MacArthur Hiroshima Hiroshima is a city located in Honshu, Japan. On August 6, 1945, Hiroshima became the first city in the world to be struck by an atomic bomb. 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Australian Tourism and Their Future for Ecotourism - myassignmenthelp

Question: Discuss about theAustralian Tourism and Their Future for Ecotourism. Answer: Title The change in the taste and preference of the people has given rise to the habits of consumerism and other significant practices. I order to adhere to the interests of the people and making them aware of the biodiversity surrounding them, the national parks and the wildlife reserves are being constructed. Moreover, the actions help in the conservation of the biodiversity as well. In order to keep up to the practices and the actions taken by the governments tourism is being developed in order to raise the finance for maintaining the facilities that are being provided to the wildlife[1]. The report will be aiming at the future of the ecotourism in Australia based on the availability of the wildlife reserves and the sanctuaries that forms a greater part of the economy relating to the tourism of the nation. on the other hand the issues relating to the faltering trust of the tourists on the traditional information and the emergence of the Trip Advisor and the like have seriously impacted the eco tourism of the nation. Key information The key issues that are being observed in the present day, relating to the eco tourism of the nation, is based on the faltering trust of the tourist on the traditional sources of information. The technological advancements that are being made by the world has enabled systems and procedures to change rapidly. People nowadays do not rely on the information from the sources of the government and the corporations of the nation[2]. On the other hand, Trip Advisor and the like deliver misleading information to the tourists which h create a heavy impact on the clients choice of the tourist spot. The client is trusting the ratings that are being hypothecated by the websites. Therefore, the misleading information affects the eco tourism of the nation largely. The most common of the issues that are being faced by the nation is based on the international indulgence of the tourism. The international clients expect a varied amount of services to be delivered in order to make use of the various segments. The tourism gets affected when the expected services are not being provided. It affects the rate of the tourism activities and thereby affects the availability of the financial resources for maintaining the eco tourism practices. Large amount of funds are necessary to uphold the practices. Therefore, in order to make use of the economy, the nation must formulate healthy and sufficing tourism activities[3]. The quality of the services that are being provided to the people helps in determining the success of the eco tourism in Australia. The quality of the service determines the tourist retention rate of the nation. In this relation the best services that are being provided to the tourists helps in making the probable progress in the eco tourism industry of the nation[4]. Moreover, it helps in building up the funds in order to make a sustainable journey of conserving the biodiversity of the regions through the wildlife sanctuaries and their maintenance. Financial implications The financial implications include the determination of the funding that are required in order to maintain the services that are being provided to the tourists and also make use of the wildlife sanctuaries in order to attract more tourists to the nation. The maintenance of the wildlife sanctuaries and the national parks not only helps in conserving the endangered species of the region but also makes use of the money that the tourist spends while undertaking their visit to the place[5]. The funding helps in the maintenance of the biodiversity of the place and thereby make it a tourist spot. It also helps in meeting the economic requirements of the nation. The tourism of the nation depends on the financial factors that support the very existence of the source of tourism and therefore in order to maintain the very source, proper funding is required. There are two probable concepts of economics on eco tourism. They are the economic value of the eco tourism and the economic impact[6]. The economic value is being created through the maintenance of the eco tourism, which attracts the tourists from all around the world. On the other hand, the economic impacts can be taken as the implications that the eco tourism enforces on the activities undertaken by the nation for maintaining the tourist spots. In this relation, the economy plays a very important role in creating revenue for the people and also raising funds from the investments of the tourists in order to ensure the safe maintenance of the biodiversity in the national parks and the wild life sanctuaries. The tourism also helps in bringing about a change in the standard of living of the p eople and thereby makes a significant contribution to the treasury. Recommendations In order to bring the significant changes relating to the eco tourism of the nation and thereby bring in sustenance in the process there are certain recommendations that the nation or the committee must undertake[7]. The modification of the policies and the systems helps in determining the probable changes in the tourism and thereby helps in making the work more simple and brief. Based on the requirements of the eco tourism industry the following recommendations can be adhered: Modifying the websites Modifying the websites that provides the tourists with the information on the systems of the tourism is an important consideration that must be taken by the government or the people looking after the sanctuaries[8]. The information plays a very important role in making the tourist aware of the services available in the area. Tourism is a vast and growing industry which includes many factors. Therefore, in order to maintain the tourism all the authorities must consider the factors and design steps for improving the information access of the tourist. Improving the Quality of services The quality of the services that are being provided by the authorities is again an important step that must be taken by the tourism industry in order to maintain and retain the client relations. It helps in maintaining a stable growth of the economy. The services that are being provided to the people helps in determining the tourism that the nation undertakes[9]. The globalization has led to newer concept, which enabled people to visit the best tourism destinations. The quality of the services that are being provided, helps in retaining the tourists largely and thereby it affects the funds that the nation aims at raising for the maintenance of the resources. Title The main objective of the reports is to demonstrate the importance of the industry and the issues that are being faced by the eco tourism in Australia. it helps in understanding the different aspects in which the issues can be addressed and the problems can be solved. the tourism helps in raising the funds and therefore is an important consideration that must be taken by the authorities in order to make a gradual progress in the methodology of the eco tourism. The conservation of the biodiversity is dependents on making the most out of the sanctuaries and thereby improves the economy of the nation[10]. Rationale The benefits for undertaking the recommendations that are being enumerated in the previous section of the report is based on the retention of the tourists through improvising the services that are being provided bu the authorities and the facilities that the tourists are entitled with. Moreover, the retention rate of the tourists helps in improving the retention rate of the tourists. It helps in improving the economic condition of the people and maintains the sanctuaries that are the source of income for the people. The funds also contribute to the treasury of the nation and therefore it helps in improving the standard of living of the nation[11]. On the other hand, the improvements and the modifications made in the information systems helps the people in achieving the correct information from the reliable sources. The dependence of the people on the information that is being provided largely affects the tourism industry of the nation. in most of the cases the information affects the tourism based on the rating s of the services that are being provided by the external websites hypothetically. The ratings affect the mentality of then people as they suppose that the tourism might be just a waste of resources, as they do not expect quality in the services that are being provided. Therefore, the right kind of information helps in making the tourists understand of the probable facilities that the tourist might be attaining through their visit[12]. Consultation The steps that are being undertaken by the units is based on the modification that are being undertaken by the units in order to promote tourism. The most important consideration that is being undertaken by the authorities is based on the requirements of the industry adhering to the valid recommendations that are being formulated[13]. In order to take the steps, the authorities and the governing bodies have formulated teams to administer over the services that are being provided to the tourists for the better understanding of their priorities. References Spenceley, A. ed., 2012.Responsible tourism: Critical issues for conservation and development. Routledge. Newsome, D., Moore, S.A. and Dowling, R.K., 2012.Natural area tourism: Ecology, impacts and management(Vol. 58). Channel view publications. Whitelaw, P.A., King, B.E. and Tolkach, D., 2014. Protected areas, conservation and tourismfinancing the sustainable dream.Journal of Sustainable Tourism,22(4), pp.584-603. Mason, P., 2015.Tourism impacts, planning and management. Routledge. Zahra, A. and McGehee, N.G., 2013. Volunteer tourism: A host community capital perspective.Annals of Tourism Research,42, pp.22-45. Andersson, T.D. and Lundberg, E., 2013. Commensurability and sustainability: Triple impact assessments of a tourism event.Tourism Management,37, pp.99-109. Hein, L., Miller, D.C. and de Groot, R., 2013. Payments for ecosystem services and the financing of global biodiversity conservation.Current Opinion in Environmental Sustainability,5(1), pp.87-93. Chen, W.Y. and Jim, C.Y., 2012. Contingent valuation of ecotourism development in country parks in the urban shadow.International Journal of Sustainable Development World Ecology,19(1), pp.44-53. Janusz, G.K. and Bajdor, P., 2013. Towards to sustainable tourismframework, activities and dimensions.Procedia economics and finance,6, pp.523-529. Lanfranchi, M., Giannetto, C. and De Pascale, A., 2014. Nature based tourism: Natural balance, impacts and management.Calitatea,15(S1), p.224. McKercher, B. and Prideaux, B., 2014. Academic myths of tourism.Annals of Tourism Research,46, pp.16-28. Prudhomme, B. and Raymond, L., 2013. Sustainable development practices in the hospitality industry: An empirical study of their impact on customer satisfaction and intentions.International Journal of Hospitality Management,34, pp.116-126. Garay, L. and Font, X., 2012. Doing good to do well? Corporate social responsibility reasons, practices and impacts in small and medium accommodation enterprises.International Journal of Hospitality Management,31(2), pp.329-337. Fairhead, J., Leach, M. and Scoones, I., 2012. Green Grabbing: a new appropriation of nature?.Journal of Peasant Studies,39(2), pp.237-261.

Winter Sports free essay sample

The Individual competition is a classical style biathlon race covering 20 km for men and 15 km for women, with 4 shooting lanes. Biathletes start at intervals of either 30 seconds or one minute with each competitor choosing his (her) own shooting lane. The first and third shooting stages are taken from the prone position, while the second and fourth are fired standing. Biathletes are penalized one minute for each missed target. The Sprint is an abbreviated version of the Individual competition and one in which speed is a key factor. Men race 10 km, and women 7. km, each with two shooting rounds one prone and one standing. For every missed target, a competitor must complete a 150-meter penalty loop. In the Pursuit competition, athletes start in a staggered fashion depending on their time in the sprint race. Men ski 12. 5 km and women 10 km. Each covers four shooting stages—the first two are taken prone and the second two from a standing position. We will write a custom essay sample on Winter Sports or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page As with the Sprint competition, athletes ski a 150-meter penalty loop for each miss. The Mass Start competition is one of the newest biathlon formats. It covers a distance of 15 km for men and 12. km for women, with four shooting stages, the first two prone and second two standing. In each race, the 30 highest ranked athletes start together simultaneously and take their place at the first shooting stage depending on their starting number. Athletes line up at the remaining shooting stages depending on the order in which they arrived at the firing line. A 150-meter penalty loop is added for each miss. The Relay consists of four-person national teams covering distances of 7. 5 km for men and 6 km for women. Each leg of the race includes two shooting stages, one prone and one standing. As opposed to the individual disciplines, biathletes in the relay have 8 rounds of ammunition for each firing range – five stored in the magazine and three extra rounds that can be loaded by hand, if necessary. Once all 8 rounds have been fired, the athlete must ski a 150-meter penalty loop for each missed target. Sports Equipment * Any form of ski techniques is permitted in the biathlon. However, only skis and ski poles may be used. * Ski boots, providing support and controlling motion. * Ski poles made of composite materials such as carbon-fibre. Their length cannot exceed the height of the athlete using them. The biathlon rifle is a 5. 6 mm calibre weapon that is carried on the athlete’s back in a special harness with the barrel pointed up. * A one-piece special ski suit helps maintain a constant body temperature and minimizes wind resistance. * Skis cannot be shorter than 4 cm less than an athlete’s height. To increase glide, various special waxes are applied to the skis. 2. 2 Skeleton as it is Skeleton is the discipline where competitors aim to drive a one-person sled in a prone, head-first position down an ice track in the fastest time. Olympic skeleton events consist of four runs timed electronically to 0. 01 seconds. The four runs are contested over two days and the final standings are determined by the aggregate time of the four runs. If athletes complete the competition in a tie, they receive the same award. Skeleton consists of two events in the Olympic program — individual men and individual women. Equipment * The sled is made of two runners. The frame must be constructed of steel. The same sled must be used in all rounds of the competition. It must weigh no more than 43kg for men and 35kg for women. * Gloves are made of leather and are worn for protection. * Handles are used for the start push and during the race. They must be covered with soft material. All competitors must wear helmets, which are hard plastic and equipped with a chin guard and visor. The racing suit is a tight-fitting bodysuit made of elastic fabric that may have padding sewn into the elbows. * Shoes are made of synthetic material and have spikes on the soles for traction during the push start.   3. Curling as it is Curling is a sport game played between two teams composed of four players each. The game is played on ice, and members of both teams deliver a 19. 96 kg stone towards a circular target area, cal led the house alternating with an opponent. The objective is to get the stone closer to the Center of the circles than any stone of the opposition. One game consists of ten â€Å"ends†. During each end, each team steers eight stones — two stones per person, alternating with the opponent. Team members deliver the stones in a set order presented to officials before the game. The first player is known as the lead. He/she is followed by the second, then the third (also known as the vice-skip) and finally the skip, or team leader. After all 16 stones have been delivered the score is determined. Only one team can score per end. A team scores one point for each of its own stones located in or touching the house that is closer to the center of the house than any of the oppositions stones. The team with the most points after 10 ends is the winner. If the score is tied after the 10th end, an â€Å"extra-end† period is added. Extra ends are played until one side wins. There are two medal events in curling: men’s and women’s team competition. Sports Equipment * A broom is used to sweep the ice surface in front of the stone. Sweeping creates a film of water between the stone and the ice, which reduces friction, thereby reducing the stones deceleration and straightening its trajectory or â€Å"curl†. Curling brooms can have fabric, hog hair, or horsehair heads. There are also corn/straw brooms, although they are used rarely nowadays. * Special curling shoes have different soles. One has an extremely slippery sole made from Teflon, plastic or steel and is used on the sliding foot. The other is made from rubber and provides much-needed traction on the ice. * A curling stone is traditionally made in Scotland of rare, dense granite. Each stone weighs 19. 96 kg, is polished and is circular in shape. * Each playing surface is 45. 72 m long and not more than 5 m wide, with a target — or house — at either end. Ice Hockey as it it Ice hockey is played on a large flat area of ice, using a three inch (76. 2 mm) diameter vulcanized rubber disc called a puck. This puck is likely to be frozen for high-level matches to decrease the amount of bouncing and friction on the ice surface. The game is contested between two teams of skaters. A team must have no more than six players on the ice while the game is in progress. As a rule, these players are: one goalkeeper, two defensemen, three forwards (two wings and one centre). There can be fewer players on the ice as a result of penalties incurred. Also, a goalkeeper can be replaced by a skater during a penalty or at any other time of the game. A regular ice hockey game consists of three periods of 20-minutes each, with a 15-minute intermission after the first and second period. There are Olympic competitions for men and women. Equipment * Equipment includes: a helmet, shoulder pads, elbow pads, mouth guard, protective gloves, heavily padded shorts, athletic cup/jock strap, shin pads and a neck protector. * Goalkeepers’ equipment includes: a helmet, catcher and blocker gloves, neck guard, chest protector, athletic cup/jock strap, heavily padded shorts and leg pads. The puck is made of vulcanized rubber, must be approved by the International Ice Hockey Federation (IHF) and must be primarily black in color. * Sticks are made of wood or other material, such as aluminium or plastic. Luge as it is Luge is considered as one of the most dangerous Olympic winter sports. Luge involves sliding at high speeds on single- or two-person sleds. The run takes place on a specially built track. The athlete starts in a seating position and after pushing off lies supine and feet-first. The sled is steered by changing the luger’s center of gravity. The winner of the competition is the rider with the fastest time. During a run, the sled can reach speeds of over 140 km/h. There are three classes of Olympic competition: singles men, singles women and doubles. Men and women compete on the same track, but women’s and doubles’ starting line is further down the course than men’s. In male and female singles, athletes take four runs down the track. The four times are added, and the fastest total time determines the winner. The competition takes two days to complete (two runs per day). Doubles luge is a one-day competition in which pairs of athletes take two runs down the track. The fastest total time determines the winner. There is no written rule that says a team must comprise members of the same sex, but men traditionally ride together. Three sets of medals are awarded for each event. Sports Equipment * Lugers wear specially designed race suits to reduce wind resistance. Luge gloves are spiked at the fingertips to assist riders as they accelerate at the start. * Riders wear helmets with clear or tinted visors that extend under the chin to reduce wind resistance. * Riders wear special shoes that typically have firm, smooth outer soles. 6. 1 Figure Skating as it is Figure skating in the Olympic Games includes both mens and womens individual events, pairs mixed, and ice dancing mixed. At the present time, four sets of medals are contested in the Olympic figure skating program. Individual mens and womens figure skating comprises a short program that includes seven compulsory moves, and a free skate program. A well-balanced free program should include jumps, spins, and steps. Likewise, pairs mixed skaters first perform a short program (7 moves) and then a free skate program. Compulsory moves include lifts, spirals, throws and synchronized jumps. One of the most significant criteria in the judging of programs is the degree to which a pairs movements mirror one another. Ice Dancing is the only discipline that allows the use of music with vocals. Dancers much adhere closely to the rhythm of the music and express the character of the music with appropriate emotion and feeling. Until the 2010-2011 season, ice dancing comprised three performances: A compulsory dance (in which the performance closely follows a prescribed set of steps set to a piece of music with a particular character and musical rhythm); An original dance, carried out in keeping with guidelines provided by the International Skating Union; And a free skate dance, the theme and music of which is left to the skaters choice, although the choreography of the dances should include a specific set of elements. At present, ice dancing competitions, like those of other forms of figure skating, consist of two programs. The short program combines a compulsory dance—consisting of one or two parts—and certain prescribed elements. The theme and rhythm of the musical accompaniment is determined each season by the ISU, while the length of this dance—currently 2 minutes and 50 seconds—is similar to requirements of other forms of figure skating. The free dance has not undergone significant changes over the years and the basis of its scoring remains the quality of the compulsory elements in close dancing positions, the unison the skaters display and their ability to express the character of the musical selection. Sports Equipment Figure skaters use the following athletic equipment: * Custom-made boots made of thick, stiff leather, with extra laces and wide tongues, which provide the ankle with both flexibility and support. * High strength carbon-steel blades with concave grooves along their entire length and teeth in the toe of the blade to allow for pushing off when performing certain types of jumps. * A suit made of stretchable material that does not restrict the skater’s range of motion. The outfit should correspond to the character of the musical selection and reflect the artistic idea of the program. A standard skating rink is 30 by 60 meters in size, with plastic or sliding boards. Figure skaters need the highest quality ice, which is possible with the aid of ice resurfacers. The thickness of the ice over its entire surface cannot vary by over 0. 5 cm. 6. 2 Short Track as it is Short track speed skating is a type of speed skating where the athletes compete on a 111. 12 m oval. At the Olympic Winter Games, Short Track Speed Skating consists of eight medal events. Men and women compete in 500m, 1000m, and 1500m races. There is a 5000m relay for men, and a 3000m relay for women. Short track speed skating is an elimination event in which skaters race in packs and try to outskate and outwit fellow competitors within their heats. The first skater to cross the finish line is the winner, regardless of time Individual competitions begin with 32 skaters and feature heats of four athletes at a time. The first two skaters in each heat to cross the finish line continue on to the next round until only 4 athletes are left to vie for medals. The men’s and women’s relays are two-day competitions consisting of a semi-final and a final. Eight teams of 4 athletes are divided into two heats of four. Every team agrees on the number of laps each athlete should skate. The only exception is the last 2 laps that are covered by the same skater. The top two teams in each semi-final advance to the final. Sports Equipment * The short track blades are very sharp and measure 40-46cm lengthwise. Short track boots lace higher up the ankle than traditional skates and are constructed from customized foot moulds and with heavier materials to help stabilize the foot and ankle around the corners. * Gloves are worn to protect skaters’ hands from blades. * Hard plastic helmets prevent potential head injuries resulting from crashes with competitors, the ice or side walls. * Skin-tight suits mould to the skater’s body to reduce wind resistance. Knee, shin, and sometimes neck guards offer protection from the blades of the skater in front. Speed Skating as it is In speed skating, athletes travel around a 400 m oval rink as fast as possible. Speed skating at the Olympic Games consists of ten individual events: 500m, 1000m, 1500m, 5000m for both men and women, women’s 3000m, men’s 10,000m and Team pursuit for men an d women. Thus 12 sets of Olympic medals are awarded in speed skating. In each event, skaters race in pairs using inner and outer lanes on a standard 400m oval. Athletes change the lanes at every lap to skate the equal distance. All events are skated once, with the exception of the men’s and women’s 500 meters, which are skated twice. The final result is based on the total time taken over the two races. In a team pursuit, men skate 8 laps and women–6. 2 teams composed of 3 skaters participate in each heat, with teams starting from opposite sides of the oval at the same time. Each skater in a team becomes a leader of the group taking all air resistance while his partners skate behind him. The race comes to an end only when the last skater on a team crosses the finish line. Sports Equipment * Skaters use special â€Å"clap skates† whose blade isn’t attached to the boot. These boots are usually made of kangaroo leather. * Skaters wear skin-tight racing suits with hoods to reduce air resistance. 6. . 1 Alpine Skiing as it is The Olympic Alpine competition consists of five events each for women and men. These include Downhill, Slalom, Giant Slalom, Super Giant, and Super Combined. The rules are the same for men and women, but the courses differ. Ten sets of medals altogether are awarded. The downhill (DH) features the longest course and the highest speeds in Alpine skiing (120 km/h). Each skier makes a single run down a course one after another and the fastest time determines the winner. The slalom (SL) is an alpine skiing discipline that involves skiing between poles (or â€Å"gates†) spaced much closer together than in Giant Slalom, Super-G or Downhill, resulting in quicker and shorter turns. Slalom is a two-run event; the skier with the fastest combined adjusted time for the two runs wins. Giant slalom (GS) involves skiing between sets of gates spaced at a greater distance from each other than in slalom but not as great as in Super-G. The number of gates in this event ranges from 56 to 70 for men and 46 to 58 for women. The final result is based on the total time taken over the two different runs. The Super giant slalom (Super-G) incorporates aspects of both downhill and giant slalom racing. It involves skiing between widely spaced gates as in Giant Slalom, but with fewer turns over a longer course and with higher speeds approaching those achieved in Downhill. The Super Combined event includes one Downhill or Super-G run and one Slalom run on a single day. Sports Equipment * Reinforced plastic boots are specific to the competition discipline. Bindings are the link between the boots and the skis. Gloves are made of leather or synthetic material * Ski goggles protect the eyes against weather, glare and the effects of speed on the eyes. * A tight-fitting helmet is designed to protect a skier’s head from injuries. * In the downhill and Super-G, poles are curved to fit around the body to reduce air resistance. Skis are made of various materials (wood, composite fibers) specially adapted to the wear and tear they undergo during a race. Skis in downhill are 30% longer than those used in slalom in order to provide added stability at high speeds. * Skin-tight racing suits are made of materials that minimize air resistance. 2 Cross-Country Skiing as it is At the Olympic Winter Games, the cross-country skiing discipline comprises twelve differ ent events. They include sprint, team sprint, individual start, pursuit, mass start and relay events. The Individual Interval Start Race is the traditional race format, where skiers compete against the clock. The skiers start the race at 30-second intervals in reverse order to their season ranking. This means that the top ranked skier will start last. The winner of the race is the skier with the fastest time. Coaches along the course time their athletes, calling out their rank at specific points of the race. Racers who are overtaken by faster competitors must step aside if ecessary to allow the faster skier to pass. In the Olympic Individual Interval Start Race, men compete over a distance of 15km (in loops of 5km) while women race a ski 10km (in loops of 5km). The Sprint Competition will, after a qualifying round (in individual interval start format), consist of 30 skiers competing in elimination heats. In the elimination heats (quarterfinals and semifinals) the skiers start side by side and ra ce one time around a 1. 3 1. 6km loop. The two fastest skiers in each heat advance to the next round. For the 6th positions in the semi-final heats and for the 5 and 6th positions in the final heat, the next two fastest competitors who are ranked 3rd or 4th (called â€Å"lucky losers†) will advance. Six skiers compete in the medal round for the Olympic medals. The team sprint competition consists of teams of two skiers skiing one at a time, tagging their teammate upon completing a 1. 5 km leg. The two skiers alternate skiing one leg each, for a total of 6 legs (3 legs each). 10 teams qualify for the finals through qualification heats, and start in a modified (arrow shape format) mass start on the first leg. In this race, there are often rapid lead changes and high speed. The Pursuit race is an exciting mass start race where skiers ski the first half of the race using the classic technique (and the necessary equipment), then switch to the free technique (in the stadium) before completing the competition. The clock is running during the equipment exchange, similar to a â€Å"pit stop† in car racing. The first skier to cross the finish line is the Pursuit winner. The skiers are required to change skis at the halfway point, and frequently also change poles. In the Pursuit race, men race 15 km (in loops of 3. 5 km) using each technique (for a total distance of 30km), while women race 7. 5km (in loops of 2. 5 km) for a total distance of 15km. The competition course is usually laid out in such a way that the skiers pass through the stadium several times. Individual Mass Start Races are the longest individual Cross Country races at the Olympic Winter Games. In the Individual Mass Start R aces, men race over a distance of 50km, while women ski a distance of 30km. The long-distance mass start events will line the whole field of skiers in rows of 7 – 11, starting a field of 60 to 80 skiers by a start gun. This particular format can be compared to bicycle racing, where large groups of athletes use strategy and tactics to gain an advantage during the course of the race, and then demonstrate their sprinting abilities at the finish. The employment of short loops allows spectators in the stadium to see the contestants every 10-12 minutes. The first skier to finish is the winner, although it is not unusual to have up to 10 athletes vying for the victory in a photo finish. The Relay format features teams of four skiers from each competing country. The two first skiers on each team must use the classic technique while the last two must use the free technique (usually skiing a different course). Skiers take turns competing, and tag their teammate in an exchange zone at the end of leg of the relay race. The team that completes all four legs of the race first is the winner. In the Relays, men race four 10-km legs each, while women race four 5-km legs. Sports Equipment * Cross-country boots for classic technique are similar in design to running shoes. The boots for free technique are more rigid and have more ankle support than the boots used for classic technique. The bindings secure only the toe of the boot to the ski. * For classic technique, the poles should extend to a standing skier’s armpit. For free technique, the poles are generally longer and stiffer and extend to the chin or mouth of the skier. They are usually made of graphite or fiberglass. * The skis are long and thin, to distribute the weight of the skier and allow the skier to move quickly. Depending on the ski design and purpose, they are customized to fit the skier. * The wax can be of two types: glide wax and kick wax, also known as grip wax. Glide waxes are used to make a ski glide faster. Kick waxes are used to provide a grip on snow when weight is transferred to a ski; they are used in classic technique only. * The suit is made from stretch fabric (lycra) that hugs the body and considerably reduces wind resistance when racing. Nordic Combined as it is Nordic Combined events include a ski jumping competition (1 jump) and a 10 km cross-country skiing race. There are three events in the Olympic program in Nordic Combined: Individual men Normal Hill (HS 105), Team men Large Hill 4 x 5 km and Individual men Large Hill (HS 140). HS stands for Hill Size and refers to the longest safe distance flown by the best athletes on a given hill. The individual events are also known as the Individual Gundersen and encompass one competition jump on either a HS 105 or HS 140 ski jumping hill and a 10 km cross-country ski race. Points are scored for distance and style in ski jumping. The racers with most ski jumping points will start first in the cross-country portion, followed by the next best jumper after a gap which reflects the difference in their jumping scores and so on. This means that the first cross-country skier to cross the finish line is also the winner of the event. This method of competition, also known as the Gundersen method, was introduced in the mid 1980s. The team event is similar to the individual event, but contested by teams of four athletes. Each takes one jump on a HS 140 m hill, with all the jumps counting towards the team total. A difference of forty-five points translates to a one minute advantage in the second event, the 4 x 5 km cross-country relay. As with the Individual events, the Gundersen method is used to determine starting times in the relay. The winner is the team whose final skier crosses the finish line first. Sports Equipment Special boots with high instep allowing skiers to lean forward during flight. * The binding must be mounted parallel to the run-direction. The binding must be placed in such a way that a maximum 57% of the entire ski length is used as the front part. A connection cord that is a part of the binding attaches the ski to the boot and prevents the wobbling of skis during flight. All portions of the ski jumping suit must be made of the same material and must offer certain degree of breathability. Special jumping skis can be up to a maximum length of 146% of the total height of the competitor. Cross-country ski equipment * The rear of the boot is built up to shore up the ankle, which is constantly under pressure in the free technique. * Skis are narrower and lighter than those used in Alpine skiing. They have long, curved ends and rise up slightly in the middle. They can be up to 2 m long. * Bindings secure only the toe of the boot to the ski. * Ski poles are long and straight, often reaching up as high as a competitors chin. * The suit is made from body hugging stretch fabric. * Glide wax is chosen depending on snow and weather conditions. 8. Ski Jumping as it is To date, only men can compete in ski jumping at the Olympic Games. Women’s World Championships have been held since 2009— currently the highest level event for women. Three mens ski jumping events are held at the Olympics: Individual Normal Hill, Individual Large Hill and the Team Event. 3 sets of Olympic medals are awarded in ski jumping. Individual Normal Hill is the only ski jumping event on HS 105m hill (K-95). The longest distance reached is around 105m. There are two jumps (the first round open to 50 who qualified on the day before and the final round limited to the top 30 after the first round). The athlete with the highest total score is declared the winner. Individual Large Hill is contested on HS 140 m hill (K-125). The best jumpers land at around 140 meters. There are two jumps: the first round, open to 50 who qualified on the day before; and the final round, limited to the top 30 after the first round. The athlete with the highest total score is declared the winner. The Team Event runs on HS 140 m hill (K-125). There are four members in each team, and there are two jumps (a first and a final round). All teams start in the first round. In the final round the field is reduced to the eight best teams. The team with the highest total score over the eight jumps is declared the winner. Sports Equipment * Special boots with high instep allowing skiers to lean forward during flight. * The binding must be mounted parallel to the run-direction. The binding must be placed in such a way that a maximum 57% of the entire ski length is used as the front part. * A connection cord that is a part of the binding attaches the ski to the boot and prevents the wobbling of skis during flight. * All portions of the suit must be made of the same material and must offer sufficient breathability. Special jumping skis can be up to a maximum length of 146% of the total height of the competitor. Freestyle as it is There are three events for men and women in the Olympic Freestyle program: moguls, aerials and ski cross. 6 sets of medals are awarded for freestyle events. In Mogul, skiers race down a course over a series of bumps or moguls. Each athlete is required to perform two tricks and jumps. The Olympic format includes a one-run elimination round followed by a one-run final of 16 to 20 skiers. Competitors receiving the highest score for their tricks and jumps in the final round are declared winners. Scores are determined by judges who evaluate the quality of a skier’s tricks, and the quality and difficulty of the jumps. Judges also give points for speed according to a special formula. The Olympic aerial competition consists of a two-jump qualifying stage followed by a two-jump final. The combined scores from the two jumps determine 12 athletes qualified for the final. Scores from the qualification round are not counted in the finals. Competitors are judged on jump takeoff (20%), jump form (50%) and landing (30%). Ski cross consists of several rounds of competition. In the qualifying stage, athletes race down a course approximately 1000 meters long with turns and obstacles. 2 athletes with the best times are then divided into groups of four and compete to determine who proceeds to the next round of competition. The top two competitors in each group then move on to the medal round. Sports Equipment * The standard length of mogul skis is typically 180cm for men and 170cm for women. For aerials, the standard ski length for both men and women is 160cm. Ski cross skis are similar to those used in the Supe r Giant Slalom. * Ski poles are used to aid the skier in accelerating, turning and maintaining balance. In moguls the color of knee pads often contrasts with that of a ski suit in order to draw the judges’ attention to the skier’s expertise. * Ski boots should provide sufficient support to allow an athlete to withstand the force of impact. * The helmet is made of hard plastic, protecting the head and preventing serious head injuries in both aerials and moguls. Snowboard as it is There are six snowboard events in the program of the Olympic Winter Games: mens half-pipe, women’s half-pipe, mens parallel giant slalom and women’s parallel giant slalom, mens Boarder-cross and women’s Boarder-cross. sets of medal are awarded altogether. The half-pipe competition takes place in a bowl-shaped course dug deep into the hill. Using speed gained on the slope, snowboarders come up over the rim of the pipe and perform acrobatic aerial tricks. The object of the half-pipe is to perform difficult tricks with perfect form. The parallel giant slalom features head-to-head matches on the mountain. After the qualification round, a 16-person tournament is established and athletes compete under the knock-out system on two side-by-side courses until there is a winner. The Boarder-cross event is held on a challenging route including jumps, bumps, berms and other obstacles. The heats consist of four riders who start at the same time, with the best two in the finish proceeding to the next round (where the athlete with the best time in the previous round goes first). Finally, the four fastest snowboarders make the final and compete for medals. Sports Equipment * A specially designed flexible board for half-pipe is essential for balance and tricks. * The Alpine board is stiff and narrow, which is ideal for turns and high speed. The Boarder-cross board is designed to allow high speed, combined with a maximum of tolerance and flexibility to avoid mistakes in the jumps and obstacles. * Snowboard footwear is usually soft boots, while boots for alpine snowboarding are firmer. * A hard plastic helmet is compulsory for all snowboard competitors.