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TWO-STEP PEIERLS TRANSITION THEORY

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Chinese Science Bulletin 1989年第17期34卷 1425-1430页

作者：周菁龚昌德 department of physics Nanjing University Center for Theoretical physics CCAST (World Laboratory)Beijing Department of Physics Nanjing University

I. INTRODUCTION Recently, the intensive explorations on the high-Tc superconductivity in copper-oxide compounds suggest the tight relationship between the high-Tc superconductivity and the Peierls instability in the perovskite parent compound la2 CuO4. But the interests in this aspect have declined since the classical Peierls transition theory encounters insurmountable difficulties in interpreting the anomalous resistivity, the photoelectron spectrum ob-

关键词： Peierls transition theory CDW interlayer coupling

SUPERCONDUCTIVITY IN la1.85Sr0.15Cu1-xZnxO4

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低温物理学报 1993年第6期15卷 425-426页

作者： Fusui Liuphysics department, Peking university, Beijing, 100871 北京大学北京

Based on the multiple exchange-mediated interaction mechanism of high- Tc superconductivity and the Abrikosov-Gorkov theory of magnetic impurity superconductors, this paper quantitatively explains the Zn-substitution ... 详细信息

关键词： Zn SUPERCONDUCTIVITY IN la x)ZnxO4 Cu Sr

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GIS在交通安全网络通道体系构建中的应用

陕西师范大学学报（自然科学版） 2002年第3期30卷 118-121页

作者：张宏美国路易斯安娜大学土木工程系美国拉斐特la70504

对GIS在交通安全网络通道体系的构建进行了介绍 ,并建立一个面向交通安全的GIS框架结构 .结合在美国的实践 ,论述了GIS不仅能对以往的交通事故进行全面的分析 ,而且能够合理制定道路的管养计划。

关键词：交通安全网络通道体系 GIS 应用体系构建框架结构交通监控交通事故

ELECTRONIC EFFECTS OF la AT THE Si-SiO2 INTERFACE

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Journal of Electronics(China) 1985年第4期2卷 350-353页

作者：李思渊张同军 department of physics lanzhou university

The negative electric effects of la metal at the Si-SiO2 interface and the heat treatment behaviorof these effects are studied *** *** results of electron spectroscopy analysisof the la-doped interfaces are also prese... 详细信息

关键词：大学学报兰州甘肃 la ELECTRONIC EFFECTS OF la AT THE Si-SiO2 INTERFACE 李寿 AT

Pressure-induced crystallite breaking in la_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_3 nanosolids

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Chinese Science Bulletin 1998年第6期43卷 458-461页

作者： ZHENG Fanlei 1, 2, SUI Yu 1, 3, XU Dapeng 1 and SU Wenhui 1, 4 1. department of physics, Jilin university, Changchun 130023, China 2. Changchun Institute of physics, Chinese Academy of Sciences, Changchun 130021, China 3. Institute of Metal R department of physics Jilin University Changchun Chinas Changchun Institute of physics Chinese Academy of Sciences Changchun China Institute of Metal Research Chinese Academy of Sciences Shenyang China International Center for Materials physics Chinese Academy of Sceinces Shenyang China Center for Condensed Matter and Radiation physics CCAST (World Lab.) Beijing China

In the compacting process of the la 0.7Sr 0.3Mn 0.9Fe 0.1O 3 nanosolids under the pressure range of 0.0-4.5 GPa, the apparent pressure-induced crystallite breaking phenomenon in these nanosolids was observed. With increasing pressure up to 4.5 GPa, the average grain size decreases by 46% while the magnetization of nanosolids decrease by 40% and their coercive increases by 35%. This kind of breaking has a close relation to the existence of oxygen deficiency in la 0.7Sr 0.3Mn 0.9Fe 0.1O 3 nanoparticles. A simple and convenient method for preparing the bulk nanosolids with a large number of clean interfaces has been suggested.

关键词： nanosolid pressure-induced breaking high pressure.

High Performance Robust and Fault Tolerant Control

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High Performance Robust and Fault Tolerant Control

Statistical Study on the HF Radar Multi-Frequency Autocorrelation Functions

第二十四届中国控制会议

作者： kemin Zhou department of Electrical and Computer Engineering, Louisiana State university, Baton Rouge, la 70803, usa

It is commonly known in the control community that there are intrinsic tradeoffs between achievable performance and robustness for a given control architecture. In other words, in order to achieve certain performance,... 详细信息

关键词： Robust control Fault Tolerant Control Performance

来源： cnki会议评论

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cnki会议

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Wuhan university Journal of Natural Sciences 1998年第4期3卷 443-448页

作者： Xie Shuguo J. P. Villain Guan Rongsheng Hou Jiechang(College of Electronic information, Wuhan university. Wuhan 430072, China LPCE, Avenue de la Recherche Scientifique, 45071 orleans CEDEX, France) Wuhan university College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***) LPCE Orleans CEDEX 2 France (GRID:grid.49470.3e)

To fit the autocorrelation functions (ACFs) of HF radar ionospheric backscattered signal to an analytical function, which is obtained theoretically by introducing a lagrangian description of turbulent motion, can estimate directly the turbulent parameters of the scatters. We use this method to analyze the HF radar ACFs. A statistical study has been performed with the multi-frequency data, and shown that the statistical results are not the same in different frequency bands. We found that the influences of the limit radar time resolution and the received noise played the important roles in causing this inconsistency, both of them result in an additional expansion to the spectral width, and cause more Lorentzian behavior to ACFs; these two limitations affect the form of ACFs more seriously in the higher frequency band. We verified this by a simple simulation.

关键词： collective wave scattering autocorrelation ionospheric backscatter

Spectrofluorimetric determination of terbium(Ⅲ) by fluorescence enhancement system of Tb-TPA-Triton X-100 by la^(3+)

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Rare Metals 2003年第2期22卷 112-115页

作者： ZHAO Guohu and ZHAO JunBasic Science department, Gansu Agricultural university, lanzhou 730070, China (Received 2002-04-29) Basic Science department Gansu Agriculturald University Lanzhou 730070

The phenomenon of fluorescence enhancement for the system of terbium(b!) with terephthalic acid (benzene-1,4-dicarboxylic acid (TPA)) in the presence of an excess of la3+ in Triton X-100 aqueous solution has been studied. The fluorescence intensity of Tbb!-TPA system can be greatly increased by la3+. The intermolecular transfer of energy was responsible for the mechanism of the fluorescence enhancement. Triton X-100 plays an important role for the stabilization of the system. The system, having the maximum excitation and emission wavelengths at 256 nm and 546 nm, respectively, shows a constant fluorescence intensity over the pH range between 4-6. The fluorescence intensity is a linear function of Tb3+concentration in the range of 1.00 ?

关键词： Analytical chemistry terbium determination spectrofluonmeter benzene-1,4-dicarboxylic acid triton X-100

Phenotypic analyses of Noggin mutant teeth and gene expression patternssuggest a functional redundancy among BMP antagonists during tooth development

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Phenotypic analyses of Noggin mutant teeth and gene expressi...