检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 216-220页

作者： J. Guo (department of physics, Guangxi university, Nanning 530004, China) Guangxi Univ Nanning China

The artificial neural network method has been applied to the relationship between the atomic parameters and intemction packeters of binary alloy Phases, and the principle of thermodynamics in combination with artificial neural network method has been used for the computerized phase diagrams of continuous solid solution of bigamy alloy systems. The computerized phase diagrams well agree with the real phase diagmms.

关键词： antificial neural network interaction parameter computerized phase diagram

ESTABLISHMENT　AND　APPLICATIONS　OF　MATHEMATICAL　MODELS　FOR　CONCENTRATION　DISTRIBUTION　IN　Mo－Fe－Ni－Co　DIFFUSION　QUARTERNARY──（Ⅱ）　Characteristics　and　Applications　of　Mathematical　Models

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1996年第4期6卷 67-71页

作者： Xu Xingyao(department of Applied Mathematics and Applied Softwares,Central south university of Technology,Changsha 410083)Gan Weiping(department of Materials Science and Engineering,Central south university of Technology,Changsha 410083) CENT S UNIV TECHNOL DEPT APPL MATH & APPL SOFTWARESCHANGSHA 410083PEOPLES R CHINA CENT S UNIV TECHNOL DEPT MAT SCI & ENGNCHANGSHA 410083PEOPLES R CHINA

ＥＳＴＡＢＬＩＳＨＭＥＮＴＡＮＤＡＰＰＬＩＣＡＴＩＯＮＳＯＦＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＳＦＯＲＣＯＮＣＥＮＴＲＡＴＩＯＮＤＩＳＴＲＩＢＵＴＩＯＮＩＮＭｏ－Ｆｅ－Ｎｉ－ＣｏＤＩＦＦＵＳＩＯＮＱＵＡＲＴＥＲＮＡＲ... 详细信息

ＥＳＴＡＢＬＩＳＨＭＥＮＴＡＮＤＡＰＰＬＩＣＡＴＩＯＮＳＯＦＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＳＦＯＲＣＯＮＣＥＮＴＲＡＴＩＯＮＤＩＳＴＲＩＢＵＴＩＯＮＩＮＭｏ－Ｆｅ－Ｎｉ－ＣｏＤＩＦＦＵＳＩＯＮＱＵＡＲＴＥＲＮＡＲＹ──（Ⅱ）Ｃｈａｒａｃｔｅｒｉｓ...

关键词： concentration diffusions mathematical models phase diagram calculations diffusion

Josephson current versus potential strength of the interface in ferromagnetic superconductors

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第5期23卷 537-541页

作者： Hamidreza Emamipour department of physics Ilam University

Based on the scattering theory, we calculate the Josephson current in a junction between two ferromagnetic super-conductors as a function of the interface potential z. We consider the ferromagnetic superconductor （FS） in three different Cooper pairing states： spin singlet s-wave pairing （SWP） state, spin triplet opposite spin pairing （OSP） state, and spin triplet equal spin pairing （ESP） state. We find that the critical Josephson current as a function of z shows clear differences among the SWP, OSP, and ESP states. The obtained results can be used as a useful tool for determining the pair symmetry of the ferromagnetic superconductors.

关键词： ferromagnetic superconductors spin singlet s-wave pairing state spin triplet opposite spin pairingstate spin triplet equal spin pairing state

A computational investigation of boron-doped chromium and chromium clusters by density functional theory

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2010年第5期53卷 812-817页

作者： GE GuiXian1,JING Qun1 & LUO YouHua2,3 1 Key Laboratory of Ecophysics and department of physics,Normal College,Shihezi university,Xinjiang 832003,China 2 School of Science,East China university of Science and Technology,Shanghai 200237,China 3 Institute of Theoretical physics,School of physics and Information Optoelectronics,Henan university,Kaifeng 475004,China 1. Key Laboratory of Ecophysics and department of physics Normal College Shihezi University Xinjiang 832003 China2. School of Science East China University of Science and Technology Shanghai 200237 China3. Institute of Theoretical Physics School of Physics and Information Optoelectronics Henan University Kaifeng 475004 China

The geometries,stabilities and electronic properties of Crn and CrnB(n=2-9) clusters have been systematically investigated by density functional *** results suggest that the lowest energy structures for CrnB clusters can be obtained by substituting one Cr atom in Crn+1 clusters with B *** geometries of CrnB clusters are similar to that of Crn+1 clusters except for local structural *** second-order difference and fragmentation energy show Cr4,Cr6,Cr8,Cr3B,Cr5B and Cr8B cluster are the most stable among these studied *** impurity B increases the stabilities of chromium *** B is doped on the Crn clusters,cluster geometry does dominate positive role in enhancing their *** doped B atom does not change the coupling way of the Cr site in Crn clusters,but breaks the symmetry and the Cr atoms are no longer *** doped B atom increases the total magnetic moments of Crn in most cases.

关键词： Crn and CrnB clusters geometries electronic properties

Quantum statistical entropy corresponding to cosmic horizon in five-dimensional spacetime

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2008年第2期51卷 140-146页

作者： ZHAO Ren1,2 & ZHANG ShengLi1 1 department of Applied physics, Xi’an Jiaotong university, Xi’an 710049, China 2 department of physics, Shanxi Datong university, Datong 037009, China department of Applied physics Xi’an Jiaotong University Xi’an 710049 China department of physics Shanxi Datong University Datong 037009 China

The generalized uncertainty relation is introduced to calculate the quantum statis-tical entropy corresponding to cosmic horizon. By using the new equation of state density motivated by the generalized uncertainty relation, we discuss entropies of Bose field and Fermi field on the background of five-dimensional spacetime. In our calculation, we need not introduce cutoff. There is no divergent logarithmic term in the original brick-wall method. And it is obtained that the quantum statistical en-tropy corresponding to cosmic horizon is proportional to the area of the horizon. Further it is shown that the entropy corresponding to cosmic horizon is the entropy of quantum state on the surface of horizon. The black hole's entropy is the intrinsic property of the black hole. The entropy is a quantum effect. In our calculation, by using the quantum statistical method, we obtain the partition function of Bose field and Fermi field on the background of five-dimensional spacetime. We provide a way to study the quantum statistical entropy corresponding to cosmic horizon in the higher-dimensional spacetime.

关键词： quantum statistical entropy generalized uncertainty relation high-dimensional spacetime

Two mode photon bunching effect as witness of quantum criticality in circuit QED

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2009年第12期52卷 1898-1905页

作者： AI Qing1,WANG YingDan2,LONG GuiLu1,3 & SUN ChangPu4 1 department of physics,Tsinghua university,Beijing 100084,China 2 department of physics,university of Basel,Klingelbergstrasse 82,4056 Basel,Switzerland 3 Tsinghua National Laboratory for Information Science and Technology,Beijing 100084,China 4 Institute of Theoretical physics,Chinese Academy of Sciences,Beijing 100080,China 1. department of physics Tsinghua University Beijing 100084 China 2. department of physics University of Basel Klingelbergstrasse 82 4056 Basel Switzerland 3. Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China 4. Institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China

We suggest a scheme to probe critical phenomena at a quantum phase transition (QPT) using the quantum correlation of two photonic modes simultaneously coupled to a critical system. As an experimentally accessible physical implementation,a circuit QED system is formed by a capacitively coupled Josephson junction qubit array interacting with one superconducting transmission line resonator (TLR). It realizes an Ising chain in the transverse field (ICTF) which interacts with the two magnetic modes propagating in the TLR. We demonstrate that in the vicinity of criticality the originally independent fields tend to display photon bunching effects due to their interaction with the ICTF. Thus,the occurrence of the QPT is reflected by the quantum characteristics of the photonic fields.

关键词： quantum phase transition photon bunching circuit QED

Estimation of convergence rate for multi-regression learning algorithm

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2012年第3期55卷 701-713页

作者： XU ZongBen1,2, ZHANG YongQuan3,1,2 & CAO FeiLong3 1Institute for Information and System Sciences, Xi’an Jiaotong university, Xi’an 710049, China 2MOE Key Labratory for Intelligent Networks and Network Security, Xi’an Jiaotong university, Xi’an 710049, China 3department of Information and Mathematics Sciences, China Jiliang university, Hangzhou 310018, China 1. Institute for Information and System Sciences Xi’an Jiaotong University Xi’an 710049 China2. MOE Key Labratory for Intelligent Networks and Network Security Xi’an Jiaotong University Xi’an 710049 China3. Department of Information and Mathematics Sciences China Jiliang University Hangzhou 310018 China

In many applications, the pre-information on regression function is always unknown. Therefore, it is necessary to learn regression function by means of some valid tools. In this paper we investigate the regression problem in learning theory, i.e., convergence rate of regression learning algorithm with least square schemes in multi-dimensional polynomial space. Our main aim is to analyze the generalization error for multi-regression problems in learning theory. By using the famous Jackson operators in approximation theory, covering number, entropy number and relative probability inequalities, we obtain the estimates of upper and lower bounds for the convergence rate of learning algorithm. In particular, it is shown that for multi-variable smooth regression functions, the estimates are able to achieve almost optimal rate of convergence except for a logarithmic factor. Our results are significant for the research of convergence, stability and complexity of regression learning algorithm.

关键词： learning theory covering number rate of convergence entropy number

BINDING　ENERGY　OF　THE　SHALLOW　DONOR　IN　（CdTe）_m／（ZnTe）_n　STRAINED　DOUBLE　QUANTUM　WELL

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1996年第2期9卷 103-108页

作者： XING Jinhai(department of physics,Liaoning university,Shenyang 110036,China)HUANG Heluan(department of Electronic Science and Engineering,Liaoning university,110036,China) Liaoning Univ Shenyang China

In this paper the binding energy of the *** in CdTe/ZnTe strained double quantum well was *** effect of the finite well potential and strain,resulting from the lattice mismatch,on the binding energy of the impurity is included in a variational *** binding energy is obtained as a function of the well width,barrier width,and impurity position in the barrier by using a variational *** result of the present calculation shows that the variational law of the binding energy is similar to that of unstrained materials.

关键词： binding energy shallow donor strained double quantum well CdTe ZnTe

EQUIVALENT CIRCUIT OF NONLINEAR EFFECT OF SPECTRAL IP

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第4期5卷 1-7页

作者： He, Jishan Li, Daqing Tang, Jingtian(department of Geology, Central south university of Technology, Changsha 410083) Central south Univ of Technology Changsha China

ＥＱＵＩＶＡＬＥＮＴＣＩＲＣＵＩＴＯＦＮＯＮＬＩＮＥＡＲＥＦＦＥＣＴＯＦＳＰＥＣＴＲＡＬＩＰ￥Ｈｅ，Ｊｉｓｈａｎ；Ｌｉ，Ｄａｑｉｎｇ；Ｔａｎｇ，Ｊｉｎｇｔｉａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，Ｃｅｎｔｒａｌ... 详细信息

ＥＱＵＩＶＡＬＥＮＴＣＩＲＣＵＩＴＯＦＮＯＮＬＩＮＥＡＲＥＦＦＥＣＴＯＦＳＰＥＣＴＲＡＬＩＰ￥Ｈｅ，Ｊｉｓｈａｎ；Ｌｉ，Ｄａｑｉｎｇ；Ｔａｎｇ，Ｊｉｎｇｔｉａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆ...

关键词： spectral IP nonlinear effect equivalent circuit admittance anode/cathode polarizaTion

同方期刊数据库

Influence of Yb^(3+) concentration on the upconversion luminescence of oxyfluoride material doped with Er^(3+)

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2010年第2期53卷 310-314页

作者： ZHAO SuLing1,XU Zheng1,WANG LiHui2 & S. Wageh3 1 Institute of Optoelectronic Technology,Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong university),Ministry of Education,Beijing 100044,China 2 department of physics,Chinese People’s Public Security university,Beijing 100038,China 3 physics & Engineering Mathematics department Faculty of Electronic Engineering Menufiya university,Menouf 32952,Egypt 1. Institute of Optoelectronic Technology Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education Beijing 100044 China2. Department of Physics Chinese People’s Public Security University Beijing 100038 China3. Physics & Engineering Mathematics Department Faculty of Electronic Engineering Menufiya University Menouf 32952 Egypt

In this paper,a new upconversion luminescent material co-doped with Erbium and Ytterbium is reported. The upconversion luminescence transition routes and related properties are studied. The results show that the absorption and emission intensities under excitation of 980 nm laser increase with the increase of the Yb3+ concentration. The red emission is stronger than the green emission. The energy transfer process plays an important role in the upconversion mechanism.

关键词： upconversion luminescence Er3+ Yb3+