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ON THE VALENCE STATE OF COPPER IN HIGH T_c SUPERCONDUCTOR YBa_2Cu_3O_x

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Journal of Rare Earths 1990年第1期8卷 26-30页

作者： Song Zengfu Wang Jiafu Lei Zimin Wu Jinguang Xu Guangxian(department of Chemistry,department of physics,peking {4.,beijing 100871,P.R.china)

Various optical luminescence spectroscopic techniques were used to characterize the high T_c superconductor YBa_2Cu_3O_*** emission bands reveal that Cu^(3+) coexist with Cu^(2+) and Cu^+ in this material.

关键词： YBCO ON THE VALENCE STATE OF COPPER IN HIGH Tc SUPERCONDUCTOR YBa2Cu3Ox Cu

Instability of the teleconnection of summer rainfalls between North china and India

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Instability of the teleconnection of summer rainfalls betwee...

Intensified Hadley Circulation and Increasing Outgoing Long-wave Radiation

中国气象学会2006年年会“首届研究生年会”分会场

作者： HUANG Jianbin WANG Shaowu (department of atmospheric Science, School of physics, peking university,{4., china)

Summer rainfall variations in North china closely relate to that in India. It seems that an alternation of signs of “+、-、+” exists in the geographical pattern of the correlation in summer rainfall fro

关键词： North china India summer rainfall teleconnection Instability

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Intensified Hadley Circulation and Increasing Outgoing Long-...

QCD Phase Transition in a Continuous Field Theory Approach

第六次全国动力气象学术会议

作者： Yongyun Hu department of atmospheric Sciences, School of physics, peking university {4., 100871

It is known that the Hadley cell is a thermally driven direct circulation,consisting of a rising of warm and moist air in the equatorial region and a descent ofcolder air in the subtropics,and that the Hadley cell tra...

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QCD Phase Transition in a Continuous Field Theory Approach

Preliminary experiments from a nonsteady atmosphere-earth surface coupled anomaly model

International Workshop on Nuclear Dynamics in Heavy-ion Reactions and Neutron Stars

作者： Yuxin Liu department of physics peking university {4. 100871 china

＜正＞We review briefly the effects of the running coupling strength,the current quark mass,the density and the finite size of the matter on the QCD phase structure and its transition in the framework of Dyson-Schwinger equation approach of *** of our present results are *** results show that,besides the medium effects,the QCD phase structure and its transition depend also on the intrinsic

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Acta Oceanologica Sinica 1988年第3期7卷 369-380页

作者： Lin Benda, Xu Xiaodong and Wang Shaowu department of Geophysics, peking university, beijing,{4. Dept. of Geophysics Peking Univ. Beijing China China

In this paper, a nonsteady atmosphere-earth surface coupled anomaly model is used to conduct both comparative experiments on the physical processes of model and monthly forecasting experiments for anomaly fields. It is shown that after further improvement it is hopeful for the anomaly model with two-hour time step to do monthly forecasting of anomaly fields by taking long period time integration. The comparative experiments show that the interaction between the atmosphere and the surface has significant influence on the long range variation for both atmospheric geopotential anomalies and surface temperature anomalies, and transient eddy transport has also certain effects on the variation of anomaly fields.

关键词： Preliminary experiments from a nonsteady atmosphere-earth surface coupled anomaly model

A DOMINANT DEFECT AT THE Si/SiO_2 INTERFACE IN MOS STRUCTURE

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Science china Mathematics 1989年第12期32卷 1458-1468页

作者：陈开茅卢殿通 department of physics Peking University Institute of Low Energy Nuclear physics of beijing Normal university

The interface defects at the Si/SiO_2 interface in ρ-type silicon (111) MOS structures have been studied by the DLTS method. A dominant defect H_(it),(0.503) at the Si/SiO_2 interface has been found. Its characteristics are (i) the average hole ionization Gibbs free energy △G_p≥0.503 eV; (ii) by changing the gate bias when the distance from Fermi level to the top of Si valence band at the Si/SiO_2 interface is less than △G_p there is still the strong DLTS peak; (iii) its hole apparent activation energy increases with the dectease of the height of semiconductor surface potential barrier; and (iv) its hole capture process causes the multiexponential capacitance transience as a function of pulse width and the H_(it)(0.503) level are very difficult to be fully filled with the holes introduced by thepulst with alimited width. All above show that there is a continuous transition energy band between the energy bands of the covalent crystal silicon and the SiO_2 in the Si/SiO_2 systems formed by thermal oxidation; the dominant defect H_(it)(0.503) is distributed in the transition region, and the distance of H_(it)(0.503) level from the top of the valence band increases with the distance from the silicon surface.

关键词： interface defects MOS structure physics model of Si/SiO_2 interface.

A dipole mode at thermocline layer in the tropical Indian Ocean

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Acta Oceanologica Sinica 2003年第1期22卷 15-24页

作者：田纪伟刘慧卿钱维宏 Physical Oceanography Laboratory Ocean University of China (Ocean University of Qingdao)Qingdao 266003China department of atmospheric Sciences Peking UniversityBeijing 100871China

Temperature data at different layers of the past 4. years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.

关键词： Temperature anomaly dipole mode in thermocline layer tropical Indian Ocean empirical orthogonal function

Modeling the impact of Australian Plate drift on Southern Hemisphere climate and environment

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Chinese Science Bulletin 2005年第14期50卷 1495-1502页

作者： ZHOU Botao1,5, ZHAO Ping2, JIAN Zhimin3 & HE Jinhai4.1. Nansen-Zhu International Research Center, Institute of atmospheric physics, Chinese Academy of Sciences, beijing 100029, china 2. Institute of Climate and Environment, Chinese Academy of Meteoro- logical Sciences, beijing 100081, china 3. Laboratory of Marine Geology, Tongji university, Shanghai 200092, china 4. department of atmospheric Sciences, Nanjing Institute of Meteorol- ogy, Nanjing 21004., china 5. Graduate School of the Chinese Academy of Sciences, beijing 100039, china Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Institute of Climate and Environment Chinese Academy of Meteorological Sciences Beijing 100081 China Laboratory of Marine Geology Tongji University Shanghai 200092 China department of atmospheric Sciences Nanjing Institute of Meteorology Nanjing 210044 China

Using a global atmosphere-ocean coupled model with the present-day and 14.MaB.P. oceanic topogra- phy respectively, two experiments are implemented to inves- tigate the effect of different locations of Australian Plate on the atmospheric circulation in middle-high latitudes of the Southern Hemisphere. The results show that when Austra- lian Plate lay south at 14.MaB.P., both anticyclone circula- tions in the subtropical oceans and cyclone circulation around 60°-70°S are strengthened. Subtropical highs and circumpolar low pressure appear stronger, which results in much stronger Antarctic Oscillation and shorter period of Antarctic Oscillation Index (AOI) at 14.MaB.P. The rainfall and the surface air temperature also change correspondingly. The precipitation decreases around 4.°S and increases around 60°-70°S, and the surface air temperature rises in high latitudes of the South Pacific and descends over the Weddell Sea and its north side. Besides, due to the changes of the temperatures and winds, Antarctic sea ice coverage also changes with its increasing in the Ross Sea and its west re- gions and decreasing in the Weddell Sea.

关键词：半球气候地球环球澳大利亚漂流物海洋地形学

Characteristics of vertical ozone distribution in the lower troposphere in the Yangtze River Delta at Lin'an in the spring of 2001

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Science china Earth Sciences 2005年第9期48卷 1519-1528页

作者： ZHENG Xiangdong1, CHAN Chuenyu2, CUI Hong2, QIN Yu3, CHAN Loyan2, ZHENG Yongguang3 & LEE Yusiang2 1. Chinese Academy of Meteorological Sciences, beijing 100081, china 2. department of Civil and Structural Engineering, Hong Kong Polytechnic university, Hung Hom, Hong Kong, china 3. department of atmospheric Sciences, peking university, beijing 100871, china 1. Chinese Academy of Meteorological Sciences 100081 Beijing China 2. department of Civil and Structural Engineering Hong Kong Polytechnic University Hung Hom Hong Kong China 3. department of atmospheric Sciences Peking University 100871 Beijing China

We analyzed vertical distributions of ozone (O3) in the lower troposphere (< 5 km above ground) at Lin’an (119.75°E, 30.30°N), Zhejiang Province using electrochemical concen- tration cell (ECC) ozonesonde data obta... 详细信息

We analyzed vertical distributions of ozone (O3) in the lower troposphere (4. episodic pollution type and (5) alti- tudinal increasing type. Vertical distributions of O3 affected by regional transport of polluted air masses were investigated. Transport of polluted air from high latitudes of northern china, ac- companying subsiding motion of air and stagnant atmospheric conditions are important factors that lead to high mixing ratios of O3 at Lin’an. The stagnant atmospheric conditions associated with a continental high pressure system and pollution plume transported from the YRD and cen- tral-eastern china also lead to regional accumulation of O3 and high O3 mixing ratio at Lin’an. Long-range transport of O3 and pollutants from the Pearl River Delta in South china and in-situ O3 formation also resulted in elevated O3 mixing ratios at around 1 km altitudes and layered O3 distribution in the lower troposphere.

关键词： vertical ozone distribution, lower troposphere, Yangtze River Delta, Lin'an.