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Superconductivity of small metal grains

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Science China(Physics,Mechanics & Astronomy) 2005年第4期48卷 431-441页

作者： ZHENG Renrong1 CHEN Zhiqian2 & ZHU Shunquan1,3.1. Department of Physics, Shanghai Normal University, Shanghai 20023., China 2. Department of Physics, southwest Normal University, Chongqing 400715, China 3. Department of Computer and Electric Technology, Shanghai Business School, Shanghai 201400, China 1. Department of Physics Shanghai Normal University 200234 Shanghai China 2. Department of Physics Southwest Normal University 400715 Chongqing China 3. Department of Computer and Electric Technology Shanghai Business School 201400 Shanghai China

The formulas of the energy gap and superconducting critical temperature appropriate for systems with both odd and even number of electrons are derived; the bases of the derivations are BCS theory and energy level statistics. Numerical results qualitatively agree with the experimental phenomena. i.e., the superconductivity of small metallic grains will first enhance then decrease to zero when the grain are getting smaller and smaller. The calculations indicate that the above phenomena happen in the metallic grains belonging to Gaussian Orthogonal Ensemble (GOE) and Gaussian Unitary ensemble (GUE) with zero spin; The superconductivity of small metallic grains in Gaussian Symplectic Ensemble (GSE) will monotonically decrease to zero with the decreasing of the grain size. The analyses suggest that the superconductivity enhancements come from pairing and the balance of the strengths between spin-orbital coupling and external magnetic field. In order to take the latter into account, it is necessary to include the level statistics given by Random Matrix Theory (RMT) in describing small metallic grains.

关键词： size effect, superconductivity enhancements, small metallic grains.

Multi-level decollement zones and detachment deformation of Longmenshan thrust belt,Sichuan Basin,southwest China

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Science China Earth Sciences 2008年第S2期51卷 32-43页

作者： TANG LiangJie1,2,3.YANG KeMing4,JIN WenZheng1,2,3.L ZhiZhou4 & YU YiXin1,2,3.1 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China 2 Key Laboratory for Hydrocarbon Accumulation Mechanism,China University of Petroleum,Ministry of Education,Beijing 102249,China 3.Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249,China 4 southwest Division Company,SINOPEC,Chengdu 610081,China 1. State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China 2. Key Laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing 102249 China 3. Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China 4. southwest Division Company SINOPEC Chengdu 610081 China

As is well known that many decollement layers were developed in the Longmenshan thrust belt,Si-chuan Basin,China. Through field investigation,explanation of seismic profiles and analysis of the balanced sections,we can divide the decollement zones into 3.categories: (1) the deep level decolle-ment zones,including the crust-mantle decollement layer,intracrustal decollement layer,and presinian basal decollement layer. The main structural styles of their deformation are the crust-mantle decoup-ling detachment deformation,the basal ductile shear deformation,etc.; (2) the middle level decollement zones,including the Cambrian-Ordovician decollement layer,the Silurian decollement layer,etc.,the main structural styles of their deformation are the isopachous fold,the angular fold,the saddle struc-ture,and the combination styles of them; and (3. the shallow level decollement zones,including the Xujiahe Formation decollement layer of Upper Triassic and the Jurassic decollement layers,the main structural styles of their deformation are the thrust-nappe tectonic,the pop-up,the triangle zone ,the duplex,etc. Multi-level decollement zones not only made the Longmenshan thrust belt develop many different deformation styles from deep place to shallow place,but also made some local areas have the superimposition of the tectonic deformation apparently. This study indicates that the multi-level de-collement zones have a very important effect on the shaping and evolution of the Longmenshan thrust belt.

关键词： decollement layer structural styles multi-level decollement zones Longmenshan thrust belt

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中建滨湖设计总部,成都,四川,中国

世界建筑 2024年第4期 16-19页

作者： China southwest Architectural Design and Research Institute Corp. Ltd. 中国建筑西南设计研究院有限公司

作为西南地区首个近零能耗建筑项目,中建滨湖设计总部从地域气候适应性的节能研究出发,考虑冬夏不同工况,突破体型系数的限制,提出了夏热冬冷地区超低能耗建筑设计的理论及方法。项目综合运用被动式策略、主动式技术与可再生能源,结合... 详细信息

作为西南地区首个近零能耗建筑项目,中建滨湖设计总部从地域气候适应性的节能研究出发,考虑冬夏不同工况,突破体型系数的限制,提出了夏热冬冷地区超低能耗建筑设计的理论及方法。项目综合运用被动式策略、主动式技术与可再生能源,结合工业化技术与新材料研发,最终实现形式空间、建筑技术与能耗性能的良好匹配。

关键词：可再生能源工业化技术体型系数气候适应性新材料研发西南地区

Enzymatic cyclization of linear peptide to plant cyclopeptide heterophyllin B

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Science China Chemistry 2006年第1期49卷 63-66页

作者： JIA Aiqun1, LI Xiang2, TAN Ninghua1, LIU Xiaozhu3. SHEN Yuemao1 & ZHOU Jun1 1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Graduate Univer-sity of Chinese Academy of Sciences, Chinese Academy of Sciences, Kunming 650204, China 2. Chinese Peptide Co., Ltd, Hangzhou 3.0018, China 3. southwest Forestry College, Kunming 650204, China 1. State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Graduate University of Chinese Academy of Sciences Chinese Academy of Sciences Kunming 650204 China 2. Chinese Peptide Co. Ltd Hangzhou 310018 China 3. southwest Forestry College 650204 Kunming China

The crude enzyme (PH-1) isolated from Pseudostellaria heterophylla by ourgroup has catalyzed enzymatic cyclization of linear peptideNH_2-Gly^1-Gly^2-Leu-Pro-Pro-Pro-lle-Phe-COOH (4) into cyclopeptide heterophyllin B (HB) from plantfor the first time. To ensure this reaction, some analytical methods including TLC, HPLC, MS, NMR,and ^(13.C labeling were used to prove that the reaction of substrate 4 sharing residue ofNH-Phe-Gly-CO was successful.

关键词： Pseudostellaria heterophylla, cyclopeptides, HB, enzymatic cyclization, isotope labeled.

Design of a 400 N and 12 mm Mechanical Air Gap High Temperature Superconducting Linear Synchronous Motor

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稀有金属材料与工程 2011年第S3期40卷 319-321页

作者： Yen Fei1,2,3. Li Jing1,2,3. Zheng Shijun1,2,3. Jiang Donghui1,2,3. Liu Lu1,2,3. Liu Wei1,2,3. Ma Guangtong1,2,3. Wang Jiasu1,3. Wang Suyu1,3.1 Applied Superconductivity Laboratory, southwest Jiaotong University, Chengdu 61003., China 2 State Key Laboratory of Traction Power, southwest Jiaotong University, Chengdu 61003., China 3.National Laboratory for Rail Transit, Chengdu 61003., China SW Jiaotong Univ Appl Superconduct Lab Chengdu 610031 Peoples R China SW Jiaotong Univ State Key Lab Tract Power Chengdu 610031 Peoples R China Natl Lab Rail Transit Chengdu 610031 Peoples R China

The static thrust output on a superconducting coated conductor coil at different excitation and alternating current suspended above a three phase alternating current long-stator comprised of copper coils is presented. Excitation current up to 45 A was applied through the superconducting coil acting as the excitation system of the superconducting linear synchronous motor (SLSM), alternating current up to 9 A was applied to the armature and magnetic air gaps of 10 and 15 mm were investigated for four different cases; coreless, with an iron core or yoke and both a core and yoke. By scaling up and converting the studied superconducting single pancake racetrack coil into a double pancake coil and connecting four of such coils in series, an SLSM prototype capable of generating 400 N of thrust output and 1 kW of power output with a 12 mm mechanical air gap operating at 77 K is proposed.

关键词： high temperature superconductivity linear synchronous motor long stator motor superconducting coil force measurements

A study of two-dimensional magnetic polaron

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Science China(Physics,Mechanics & Astronomy) 2006年第4期49卷 421-429页

作者： LIU Tao1, ZHANG Huaihong1, FENG Mang1,2 & WANG Kelin1,3.1. School of Science, southwest University of Science and Technology, Mianyang 621010, China 2. Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 43.070, China 3. Department of Modern Physics, University of Science and Technology of China, Hefei 23.026, China School of Science Southwest University of Science Technology Mianyang 621010 China Wuhan Institute of Physics Mathematics Chinese Academy of Sciences Wuhan 430070 China Department of Modern Physics University of Science Technology of China Hefei 230026 China

By using the variational method and anneal simulation, we study in this paper the self-trapped magnetic polaron (STMP) in two-dimensional anti-ferromagnetic material and the bound magnetic polaron (BMP) in ferromagnetic material. Schwinger angular momentum theory is applied to changing the problem into a coupling problem of carriers and two types of Bosons. Our calculation shows that there are single-peak and multi-peak structures in the two-dimensional STMP. For the ferromagnetic material, the properties of the two-dimensional BMP are almost the same as that in one-dimensional case; but for the anti-ferromagnetic material, the two-dimensional STMP structure is much richer than the one-dimensional case.

关键词： self-trapped magnetic polaron, bound magnetic polaron, impurity potential, anti-ferromagnet.

Soil Erosion Control Degree of the Project of Converting Farmland to Forest in Mountainous Areas at China's southwest Border:A Case Study in Mangshi,Yunnan Province

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Journal of Mountain Science 2011年第6期8卷 845-854页

作者： YANG Zisheng HAN Huali ZHAO Qiaogui Institute of Land ＆ Resources and Sustainable Development Yunnan University of Finance and Economics Kunming 650221 China southwest University Chongqing 400715 China Department of Land ＆ Resources of Yunnan Province Kunming 650224 China

There have been few in-depth quantitative studies on soil erosion control and the ecological effects of land use changes. Soil erosion is the first eco-environmental problem particularly in mountainous areas. A major problem in the conversion of farmland to forest is to control soil erosion and improve ecological environment and thus to improve land use sustainability. We report results of calculation and analysis on soil erosion from converted farmland parcels in city of Mangshi （near the SW frontier of China） and the surrounding areas before and after the nine-year （2000-2009） project of converting farmland to forest. There was increased water conservation effect, as a result of decreased soil erosion. The average erosion modulus of the farmland returning to eco-friendly uses decreased by 5,53..59 t/km2·a and the control degree of soil erosion modulus reached 71.00%. The increased soil erosion after the returning in the typical sample area ＂did not drop, but increased＂ as the terraced fields decreased but sloping farmland inereased and yet woodland decreased.

关键词： Soil erosion Control degree The projectof converting farmland to forest Converted farmland

Magnetic mineralogy of the Hongqiling Cu-Ni sulphide deposit: Implications for ore genesis

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Progress in Natural Science:Materials International 2007年第10期17卷 1192-1198页

作者： Xi Aihua1,2, Ge Yuhui1, Cai Yuanfeng2 and Zhang Xuefeng3.1. Faculty of Resources & Environment, southwest Petroleum University, Chengdu 610500, China 2. State Key Laboratory for Endogenic Metal Deposit Research, Nanjing University, Nanjing 210093. China 3. Department of Natural Resources & Technology Information, China University of Petroleum, Beijing 102249, China) Faculty of Resources & Environment Southwest Petroleum University Chengdu 610500 China State Key Laboratory for Endogenic Metal Deposit Research Nanjing University Nanjing 210093 China Department of Natural Resources & Technology Information China University of Petroleum Beijing 102249 China

Pyrrhotite is one of the common ore minerals in Cu-Ni sulphide deposits, but only monoclinic pyrrhotite is ferromagnetic at room temperature. X-ray and EPA analyses reveal that most pyrrhotite forming sideronitic texture in the Hongqiling Cu-Ni sulphide deposit is monoclinic, but that in the massive ore is a mixture of monoclinic and hexagonal pyrrhotites. Differential thermal and magnetic- thermogravimetric analyses of massive ore indicate a magnetic transition and heat absorption at 3.3., suggesting that this temperature is the thermomagnetic and phase transition point of pyrrhotite. For massive pyrrhotite ores heated at 400oC for 3. h and then quenched by cool water, the monoclinic pyrrhotite (mpo) transforms completely into the hexagonal pyrrhotite (hpo). However, all the pyrrhotites resulting from slow cooling of the sample in air are mpo. These results indicate that transformation between hpo and mpo depends upon the cooling rate. Therefore, massive ores in this deposit might have been formed via rapid cooling of ore melts. On the other hand, it is significant to study the effect of the ratio of the magnetite in total ores on the genesis of magmatic Cu-Ni suphide deposits.

关键词： pyrrhotite magnetite genesis of Cu-Ni sulphide deposit Hongqiling.

Construction and cross-correlation analysis of the affective physiological response database

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Science China(Information Sciences) 2010年第9期53卷 1774-1784页

作者： WEN WanHui1,QIU YuHui2,LIU GuangYuan1*,CHENG NanPu3.& HUANG XiTing4 1School of Electronic and Information Engineering,southwest University,Chongqing 400715,China 2College of Computer and Information Science,southwest University,Chongqing 400715,China 3.chool of Materials Science and Engineering,southwest University,Chongqing 400715,China 4School of Psychology,southwest University,Chongqing 400715,China 1. School of Electronic and Information Engineering Southwest University Chongqing 400715 China2. College of Computer and Information Science Southwest University Chongqing 400715 China3. School of Materials Science and Engineering Southwest University Chongqing 400715 China4. School of Psychology Southwest University Chongqing 400715 China

Six kinds of emotions,namely joy,surprise,disgust,grief,anger and fear,are elicited from 3.0 ordinary college students by means of high-rated movie *** signals of galvanic skin response(GSR),heart rate(HR),blood volume pulse(BVP),electrocardiogram(ECG),respiration(Rsp.),facial electromyography(EMG) and two channels of electroencephalography(EEG) from the frontal lobe were recorded while the subjects were watching the affective eliciting *** samples of each kind of signals are analyzed by using random matrix theory(RMT).From the distribution of the eigenvalues and eigenvectors of the correlation matrices of BVP,facial EMG and two EEGs,we find that the statistical properties of these four kinds of signals coincide with the RMT ***,the largest eigenvalue and the corresponding eigenvector component distribution of the correlation matrices of GSR,HR,ECG and *** deviated significantly from the RMT *** experiments also reveal that the correlations between two arbitrary samples of BVP,facial EMG or EEGs does not result from affective response but from random noises,whereas the amplitude variations of GSR,HR,ECG and *** the correlated affective physiological response *** to the data analysis results of RMT,110 features are firstly extracted from the GSR and HR signals,and then a subset of the initial features is selected by using the Backward Selection *** affective data samples each of which is a vector of the features are classified by using a Fisher classifier,and furthermore,the user-independent emotion recognition systems with good prediction performance are constructed during the model selection process.

关键词： affective computing emotion recognition affective physiological response database correlation analysis random matrix theory