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Ferromagnetism in an Itinerant Electron System

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Communications in Nonlinear Science and Numerical Simulation 1996年第3期1卷 12-16页

作者： D. F. WAANG(Institut de Physique Theorique Ecole Polytechnique Federale de lausanne,PHB-Ecublens, CH-1015 lausanne, Switzerland)E-mail: wang@sidpsg. epfl.ch Institut de Physique Théorique Ecole Polytechnique Fédérale de lausanne PHB-Ecublens CH-1015 Lausanne Switzerland

In this work, the ground states of the Hubbard model on complete graph arestudied, for a finite lattice sise L and arbitrary on-site energy U. We construct explicitlythe ground states of the system when the number of the electrons Ne ≥ L + 1. In particular,for Ne = L + 1, the ground state is ferromagntic with total spin sg = (Ne - 2)/2.

关键词： Ferromagnetism Hubbard model Kondo-lattice model

不同精粗比饲粮对西藏地区娟珊牛泌乳性能、消化代谢、瘤胃发酵参数及免疫能力的影响

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家畜生态学报 2024年第8期45卷 22-27页

作者：赵丽索朗曲吉次仁罗布旦增洛桑晋美加措巴桑珠扎西藏自治区农牧科学院畜牧兽医研究所西藏拉萨850009 西藏自治区农牧厅畜牧中心西藏拉萨850000

试验旨在探究不同精粗比饲粮对西藏地区娟珊牛泌乳性能、消化代谢、瘤胃发酵参数及免疫力的影响。采用单因素完全随机区组试验设计,Ⅰ、Ⅱ、Ⅲ组饲粮精粗比为40∶60、50∶50、60∶40。结果表明:(1)Ⅲ组和Ⅱ组奶牛干物质采食量、产奶量... 详细信息

试验旨在探究不同精粗比饲粮对西藏地区娟珊牛泌乳性能、消化代谢、瘤胃发酵参数及免疫力的影响。采用单因素完全随机区组试验设计,Ⅰ、Ⅱ、Ⅲ组饲粮精粗比为40∶60、50∶50、60∶40。结果表明:(1)Ⅲ组和Ⅱ组奶牛干物质采食量、产奶量和乳蛋白含量均显著高于Ⅰ组(P<0.05)。Ⅱ组料奶比显著低于Ⅲ组和Ⅰ组(P<0.05)。Ⅲ组和Ⅱ组奶牛乳脂率显著低于Ⅰ组(P<0.05)。(2)Ⅲ组和Ⅱ组奶牛干物质(DM)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)和粗蛋白(CP)表观消化率显著高于Ⅰ组(P<0.05)。(3)Ⅲ组奶牛瘤胃液中总挥发酸和丙酸比例显著高于Ⅱ组(P<0.05),Ⅱ组显著高于Ⅰ组(P<0.05)。Ⅲ组和Ⅱ组氨态氮(NH 3-N)和微生物蛋白(MCP)含量显著高于Ⅰ组(P<0.05)。(4)Ⅲ组和Ⅱ组奶牛血清总蛋白(TP)含量显著高于Ⅰ组(P<0.05)。Ⅲ组和Ⅱ组血清中免疫球蛋白A(IgA)的含量显著高于Ⅰ组(P<0.05)。Ⅰ组白细胞介素4(IL-4)的含量显著低于Ⅱ组和Ⅲ组(P<0.05)。Ⅰ组血清肿瘤坏死因子(TNF-α)的含量显著高于Ⅲ组和Ⅱ组(P<0.05)。综上所述,精粗比为50:50和60:40的日粮能够显著提高娟珊牛的产奶量,提高娟珊牛对营养物质的消化和吸收,并且能够提高娟珊牛的免疫抗炎能力。

关键词：娟珊牛精粗比泌乳性能消化代谢免疫能力

Raman Spectroscopic Study of Silicon Nanopowders

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Journal of Materials Science & Technology 1997年第4期13卷 327-332页

作者： S.M.Scholz J.Dutta and H.Hofmann(Lab. de Technologie des Poudres, Departement de Materiaux, Ecole Polytechnique Federale de lausanne,1015 lausanne, Switzerland)H.Hofmeister (Max-Planck-Institut fur Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany) Lab. de Téchnologie Des Poudres Département de Matériaux Ecole Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland Max-Planck-Institut Für Mikrostrukturphysik Weinberg 2 D-06120 Halle Germany

Vibrational properties of silicon nanopowders are discussed with reference to Raman spectroscopic measurements. The powders were produced in a low pressure rf plasma from the cluster induced agglomeration of positive ions formed during the dissociation of silane. Influence of thermal treatment and the crystallization phenomena of the powder were studied. Raman spectroscopic measurements reveal size quantization effects for the particles as well as the existence of partially ordered regions in the apparently amorphous primary particles. The crystalline and amorphous volume fraction in the material were calculated from the relative spectraI intensities. The results obtained in these experiments are consistent with the observations from recent high resolution transmission electron microscopy studies of these powders

关键词： HRTEM cm nm Raman Spectroscopic Study of Silicon Nanopowders

Applications of functionalized ionic liquids

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Science China Chemistry 2006年第5期49卷 385-401页

作者： LI Xuehui1, ZHAO Dongbin2,3, FEI Zhaofu2 & WANG Lefu1 1. Department of Chemical Engineering, Guangdong Provincial Laboratory of Green Chemical Technology, South China Uni-versity of Technology, Guangzhou 510641, China 2. Swiss Federal Institute of Technology, lausanne, EPFL, CH-1015 lausanne, Switzerland 3. PKU Green Chemistry Center, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China Department of Chemical Engineering Guangdong Provincial Laboratory of Green Chemical Technology South China University of Technology Guangzhou China lausanne EPFL Swiss Federal Institute of Technology Lausanne Switzerland PKU Green Chemistry Center Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing China

Recent developments of the synthesis and applications of functionalized ionic liquids (including dual-functionalized ionic liquids) have been highlighted in this review. Ionic liquids are at-tracting attention as alternative solvents in green chemistry, but as more functionalized ILs are pre-pared, a greater number of applications in increasingly diverse fields are found.

关键词： ionic liquids functionalized ionic liquids dual-functionallzed ionicliquids reaction media asymmetric synthesis nano-materials porous materials lubricants flue-gas desulfurization oil desul-furization

XV International Congress on Nutrition and Metabolism in Renal Disease

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Enantioselective Multciomponent Reactions

2010年

作者： may lausanne SWITZERLAND

来源：畅想之星图书光盘版（南... 评论

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Enantioselective Multciomponent Reactions

Different analytical models and methods to study wave propagation across rock joints

The 5th International Conference on Multi-Component Reactions and Related Chemistry(MCR2011)

作者： Jieping Zhu Institute of Chemical Sciences and Engineering Ecole Polytechnique Fdrale de lausanne EPFL-SB-ISIC-LSPN CH-1015 lausanne Switzerland

＜正＞The field of catalytic enantioseletive transformations has blossomed into a mainstay of *** many reactions can currently be run with high yields and high enantioselectivities,there remains progress to be made in terms of reaction efficiency,atom economy and environmental *** direction that can potentially combine

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Different analytical models and methods to study wave propag...

Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics

作者： J.B.Zhu W.Wu & J.Zhao Laboratory for Rock Mechanics(LMR) Ecole Polytechnique Federale de lausanne(EPFL) lausanne Switzerland

＜正＞Rock Masses are different from other engineering materials by the existence of a great number of *** results in the discontinuous characteristics of rock masses,and greatly affect the properties of rock *** a wave propagates in jointed rock masses,it is both slowed and attenuated, mainly due to the existence of *** effects of rock joints on wave p ropagation are of fundamental interest in geophysics exploration,rock dynamics,earthquake seismology, and hydrocarbon production.

关键词： Dynamics blasting rock joints rock mass

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长大深埋隧道(连载一)

现代隧道技术 2012年第3期49卷 1-8,24页

作者： ITA No.17 Work Group(International Tunneling and Underground Space Association,lausanne CH-1015) 国际隧道协会第17工作组

因工程的复杂性、地质条件的不确定性及施工运营安全的严苛性,长大深埋隧道工程在规划、设计、施工、运营等方面面临诸多技术挑战。文章针对地质勘察、隧道系统方案选择、设计方案、开挖方法和支护系统、施工及运营安全、风险管理等方... 详细信息

因工程的复杂性、地质条件的不确定性及施工运营安全的严苛性,长大深埋隧道工程在规划、设计、施工、运营等方面面临诸多技术挑战。文章针对地质勘察、隧道系统方案选择、设计方案、开挖方法和支护系统、施工及运营安全、风险管理等方面提出了具体的建议,可为隧道工程技术人员提供借鉴、指导。

关键词：长大深埋隧道规划设计施工运营风险安全

Planning and Architectural Considerations of Underground Science City in Singapore

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Planning and Architectural Considerations of Underground Sci...