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RISS 인기검색어
- 검색키워드
- 저자 : Cottam, Y.H. (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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One- and Two-magnon and Exciton Raman Scattering in Antiferromagnetic CoF2: Experiment and Theory
E. Meloche,M. G. Cottam,D. J. Lockwood 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Experimental data are reported for the temperature and polarization dependence of the oneandtwo-magnon Raman light scattering in the rutile-structure antiferromagnet CoF2. The correspondingnStokes and anti-Stokes Raman spectra are measured, emphasizing the temperature andpolarization variations of the one-magnon frequency, line width, and integrated intensity. A Green’sfunction method is employed to derive the excitation energies and their intensities over a broad rangeof temperatures (below the N´eel temperature = 38 K) for a spin S = 3/2 anisotropic antiferromagnetwith strong spin-orbit coupling. The exchange terms are analyzed using the random-phaseapproximation while single-ion anisotropy terms are treated exactly by generating a closed set ofcoupled Green’s function equations. Good overall agreement between theory and experiment isobtained.
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Morel, P.C.H.,Cottam, Y.H. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.11
A growth trial and a digestibility trial were conducted to examine the effect of feed particle size on the performance, nutrient digestibility, gastric ulceration and intestinal morphology in pigs fed barley-based diets. Barley was processed through a hammer mill to achieve four diets varying in particle size (average particle $size{\pm}standard $deviation): coarse ($1,100{\pm}2.19\;{\mu}m$), medium ($785{\pm}2.23\;{\mu}m$), fine ($434{\pm}1.70\;{\mu}m$) and mixed (1/3 of coarse, medium and fine) ($789{\pm}2.45\;{\mu}m$). Sixty-four entire male pigs were used in the growth trial and the diets were fed ad libitum between 31 kg and 87 kg live weight. Following slaughter, stomach and ileal tissues were scored for integrity (ulceration or damage) and histological measurements taken. Twenty-four entire male pigs were used in the digestibility trial, which involved total faecal collection. Over the entire growth phase, there were no differences (p>0.05) in average daily gain and feed conversion ratio between pigs fed diets of different particle size. Pigs fed the coarse and medium diets had lower (p<0.05) stomach ulceration scores (0.20 and 0.25, respectively, on a scale from 0 to 3) than those fed the mixed (0.69) or the fine diets (1.87). The stomachs of all animals fed the fine diet had lesions and stomach ulcerations were present only in this group. Pigs fed the fine diet had thicker (p<0.001) ileal epithelial cell layer with no differences (p>0.05) being observed for villous height or crypt depth. Faecal digestibility coefficients of neutral and acid detergent fibre were the highest (p<0.05) for the mixed diet, intermediate for the fine and coarse diets and the lowest for the medium diet. A similar numerical trend (p = 0.103) was observed for the apparent faecal energy digestibility coefficient. It is concluded that, with barley based diets, a variation in average particle size between $400{\mu}m$ and $1,100{\mu}m$ had no effect on pig performance but the fine dietary particle size affected the integrity of the stomach, as well as the structure of the small intestine, thus compromising overall gut health. Our data also demonstrate that changes in particle size distribution during the digestion process, rather than average particle size or particle size variation, are related to apparent faecal digestibility.
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Source of the Variation in Meat and Bone Meal Nutritional Quality
Hendriks, W.H.,Cottam, Y.H.,Morel, P.C.H.,Thomas, D.V. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.1
The gross composition, gross amino acid content, apparent ileal amino acid digestibility and apparent ileal digestible amino acid content from 64 commercially produced meat and bone meals were statistically analysed. The samples were produced by 22 plants over a 2.5 year period with eight plants using batch dry rendering and 14 plants using low temperature rendering. A linear model with method and time of year (period) as fixed effects, plant within method as a random effect and sheep percent as a covariate was fitted to the composition data. The majority of the variation in the gross composition, amino acid digestibility and digestible amino acid content was explained by differences between plants using the same method. Neither rendering season nor origin of the raw materials contributed significantly to the observed variation in meat and bone meal protein quality. Rendering method (low temperature or batch rendering) had a significant effect on the variation observed in gross fat content, gross energy content, pepsin nitrogen digestibility, protein solubility and total lanthionine content. The digestibility of a number of amino acids and the apparent digestible content of arginine, cysteine, aspartic acid, proline and hydroxyproline were also significantly affected by rendering method. On average, batch dry and low temperature rendering systems produce meat and bone meals of similar nutritional quality. The variation between plant and within plant, however, is large, indicating that purchasing meat and bone meal from the same plant does not guarantee a consistent quality.
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Jan Borchmann,Hoa T. Nguyen,M. G. Cottam 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
A microscopic theory is employed to study magnonic crystals represented by one-dimensionalarrays of ferromagnetic nanorings. The Hamiltonian-based formalism includes the exchange anddipole-dipole coupling within each ring, as well as the long-range dipolar coupling between ringsand an external applied magnetic field. Depending on the applied field, the size of the rings, and theinter-ring spacing, the array elements may be in a vortex (flux closure), onion (bidomain), or otherinhomogeneous magnetization state. Numerical results are reported for the magnonic bands andgaps in Permalloy nanorings with outer diameter typically of order 100 nm. In a strong-couplingregime it is found typically that the bands are wide and the gaps small in the vortex state, andvice-versa in the onion state.
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