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Classical-field description of Bose-Einstein condensation of parallel light in a nonlinear optical cavity

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Chinese Physics B 2021年第11期30卷 185-195页

作者： Hui-Fang Wang Jin-jun zhang jian-jun zhang School of Chemistry and Material Science Shanxi Normal UniversityLinfen 041004China School of Physics and Information Science Shanxi Normal UniversityLinfen 041004China

We study the Bose–Einstein condensation of parallel light in a two-dimensional nonlinear optical cavity,where the massive photons are converted into photon molecules(p-molecules).We extend the classical-field method to provide a description of the two-component system,and we also derive a coupled density equation which can be used to describe the conversion relation between photons and ***,we obtain the chemical potential of the system,and we also find that the system can transform from the mixed photon and p-molecule condensate phase into a pure p-molecule condensate ***,we investigate the collective excitation of the *** also discuss the problem how the spontaneous decay of an atom is influenced by both the phase transition and collective excitation of the coupling system.

关键词： parallel light Bose-Einstein condensation quantum phase transition collective excitation

A comparison study on interfacial properties of fluorine-bearing and fluorine-free mold flux for casting advanced high-strength steels

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Journal of Iron and Steel Research International 2022年第10期29卷 1613-1618页

作者： jian-jun zhang Bing-yu Zhai Lei zhang Wan-lin Wang Central Research Institute of Baosteel(Qingshan) Wuhan430080HubeiChina School of Metallurgy and Environment Central South UniversityChangsha410083HunanChina National Center for International Research of Clean Metallurgy Central South UniversityChangsha410083HunanChina

A comparison study on interfacial properties of a traditional fluorine-bearing(F-bearing)mold flux and a newly designed fluorine-free(F-free)mold flux to produce advanced high-strength steels(AHSSs)by compact strip production technology was *** results showed that these two kinds of mold fluxes gradually spread out on the typical AHSS substrate when slags began to melt with the increase in heating temperature,and they had a good interfacial ability between the two mold fluxes and the AHSS substrate,and there was no other interfacial reaction except the oxidization of steel substrate by the mold *** comparison,the wettability of the designed F-free mold flux with the AHSS substrate was better than that of the F-bearing mold *** reason could be explained as the addition of B_(2)O_(3) would increase the complexity and polymerization degree of the melt structure and weaken the attractive force between the ions and ionic groups,then leading to a better ***,B_(2)O_(3) is an effective flux,which can reduce the melting temperature obviously,and the surface tension of the liquid F-free mold flux would get reduced with the addition of B_(2)O_(3).

关键词： Advanced high-strength steel Mold flux Fluorine-free Interfacial property Wettability

A NUMERICAL EMBEDDING METHOD FOR SOLVING THE NONLINEAR COMPLEMENTARITY PROBLEM(I) ——THEORY

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Journal of Computational Mathematics 2002年第3期20卷 257-266页

作者： jian-jun zhang De-ren Wang Shanghai Univ Dept Math Shanghai 200436 Peoples R China

Presents information on a study which extended the numerical embedding method for solving the smooth equations to the nonlinear complementarity problem. Presentation of the nonlinear complementarity problem; Use of th... 详细信息

关键词： B-differentiable equations nnlinear complementarity problem nmerical embedding method

Enhanced second harmonic generation in a two-dimensional optical micro-cavity

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Chinese Physics B 2018年第3期27卷 286-290页

作者： jian-jun zhang Hui-Fang Wang jun-Hua Hou School of Physics and Information Science Shanxi Normal University Linfen 041004 China

We introduce a two-dimensional Bose-Einstein condensation model consisting of massive photon and photon-pair. Based on the new nonlinear model, the traditional process of second harmonics generation is reinvestigated. In order to describe the process, a new quantum phase, the harmonic phase, is introduced. The order parameter of the new physical phase is also given in this paper.

关键词： Bose-Einstein condensation quantum phase transition photon

Glu R2-3Y Inhibits the Acquisition and Reinstatement of Morphine-Induced Conditioned Place Preference in Rats

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Neuroscience Bulletin 2016年第2期32卷 177-182页

作者： Xiao-Jing Lin jian-jun zhang Long-Chuan Yu Laboratory of Neurobiology and the National Laboratory of Biomembrane and Membrane Biotechnology College of Life Sciences Peking University Beijing 100871 China Key Laboratory of Mental Health Institute of PsychologyChinese Academy of Sciences Beijing 100101 China National Institute of Biological Sciences Beijing 102206China

Accumulating evidence indicates that a-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors（AMPARs） are involved in the relapse to abused ***, the role of AMPARs containing the Glu R2 subunit in opiate addiction is still unclear. Glu R2-3Y,an interfering peptide, prevents the endocytosis of AMPARs containing the Glu R2 subunit. In this study, we explored the effect of intravenous injection of Glu R2-3Y on the acquisition, expression, and reinstatement of morphine-induced conditioned place preference（m CPP） in rats. We found that infusion of Glu R2-3Y（1.5 nmol/g） one hour before morphine during the conditioning phase inhibited the acquisition of m CPP, while an identical injection one hour before the post-conditioning test had no influence on the expression of m CPP. Injection of Glu R2-3Y（1.5 nmol/g） after m CPP extinction blocked the morphine-induced reinstatement of m CPP. Our results strongly support the hypothesis that inhibition of AMPAR endocytosis provides a new target for the treatment of opiate addiction.

关键词： Glu R2-3Y AMPA receptors Morphine Conditioned place preference Acquisition of mCPP Reinstatement of mCPP

A Linear Approach for Depth and Colour Camera Calibration Using Hybrid Parameters

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Journal of Computer Science & Technology 2016年第3期31卷 479-488页

作者： Ke-Li Cheng Xuan Ju Ruo-Feng Tong Min Tang jian Chang jian-jun zhang College of Computer Science and Technology Zhejiang University Hangzhou 310027 China National Centre for Computer Animation Bournemouth University Poole BH12 5BB U.K.

Many recent applications of computer graphics and human computer interaction have adopted both colour cameras and depth cameras as input devices. Therefore, an effective calibration of both types of hardware taking different colour and depth inputs is required. Our approach removes the numerical difficulties of using non-linear optimization in previous methods which explicitly resolve camera intrinsics as well as the transformation between depth and colour cameras. A matrix of hybrid parameters is introduced to linearize our optimization. The hybrid parameters offer a transformation from a depth parametric space （depth camera image） to a colour parametric space （colour camera image） by combining the intrinsic parameters of depth camera and a rotation transformation from depth camera to colour camera. Both the rotation transformation and intrinsic parameters can be explicitly calculated from our hybrid parameters with the help of a standard QR factorisation. We test our algorithm with both synthesized data and real-world data where ground-truth depth information is captured by Microsoft Kinect. The experiments show that our approach can provide comparable accuracy of calibration with the state-of-the-art algorithms while taking much less computation time （1/50 of Herrera＇s method and 1/10 of Raposo＇s method） due to the advantage of using hybrid parameters.

关键词： camera calibration depth camera linear optimization camera pair Kinect

Broadband channel measurement and analysis

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 24-28页

作者： zhang Ming zhang jian-hua jianG jun zhang Ping WU Yu-fei Wireless Technology Innovation Labs (WTI) Beijing University of Posts and Telecommunications Beijing 100876 China

An outdoor propagation measurement campaign for beyond 3G （B3G） as well as a wide-band indoor measurement campaign have been performed recently in Beijing, China, in which the sounding signals are transmitted by an one-antenna base station and received by a two-antenna mobile receiver operated at 3.49～3.51 GHz bandwidth. Different scenarios： stationary line-of-sight （LoS）, stationary non-LoS （NLoS） scenarios, and dynamic NLoS are deliberately chosen in a classic urban environment and office environment. The initial results are presented in this article. Parameters including vector channel impulse response, path loss, rays number, excess delay spread etc. are extracted, analyzed, and briefly reported here.

关键词： Broadband measurement Beyond 3G path loss,multipath delay rays number

Postischemic Housing Environment on Cerebral Metabolism and Neuron Apoptosis after Focal Cerebral Ischemia in Rats

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Current Medical Science 2018年第4期38卷 656-665页

作者： Hai-zhou QIAN Hong zhang Lin-ling YIN jun-jian zhang Department of Neurology Zhongnan Hospital of wuhan University Wuhan 430071 China Department I of Neurology Xiaogan Hospital Wuhan University of Science and Technology Xiaogan 432000 China

The purpose of this study was to evaluate the roles of different housing environments in neurological function, cerebral metabolism, cerebral infarction and neuron apoptosis after focal cerebral ischemia. Twenty-eight Sprague-Dawley rats were divided into control group （CG） and cerebral ischemia group, and the latter was further divided into subgroups of different housing conditions： standard environment （SE） subgroup, individual living environment （IE） subgroup, and enriched environment （EE） subgroup. Focal cerebral ischemia was induced by the middle cerebral artery occlusion （MCAO）. Beam walking test was used to quantify the changes of overall motor function. Cerebral infarction and cerebral metabolism were studied by in vivo magnetic resonance imaging and 1H-magnetic resonance spectra, respectively. Neuron necrosis and apoptosis were detected by hematoxylin-eosin and TUNEL staining methods, respectively. The results showed that performance on the beam-walk test was improved in EE subgroup when compared to SE subgroup and IE subgroup. Cerebral infarct volume in IE subgroup was significantly larger than that in SE subgroup （P〈0.05） and EE subgroup （P〈0.05） on day 14 after MCAO. NAA/Cr and Cho/Cr ratios were lower in MCAO groups under different housing conditions as compared to those in CG （P〈0.05）. NAA/Cr ratio was lower in IE subgroup （P〈0.05） and higher in EE subgroup （P〈0.05） than that in SE subgroup. NAA/ Cr ratio in EE was significantly higher than that in IE subgroup （P〈0.05）. Cho/Cr ratio was decreased in MCAO groups as compared to that in CG （P〈0.05）. A significant decrease in normal neurons in cerebral cortex was observed in MCAO groups as compared to CG （P〈0.05）. The amount of normal neurons was less in IE subgroup （P〈0.05）, and more in EE subgroup （P〈0.05） than that in SE subgroup after MCAO. The amotmt of normal neurons in EE subgroup was significantly more than that in IE subgroup after MCAO （P〈0.05）. The ratio of TUNEL-positive neurons in EE was signi

关键词： cerebral ischemia enriched environment individual living environment cerebral metabolism neuron apoptosis

Research and design of the protection circuits in LD controller

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The Journal of China Universities of Posts and Telecommunications 2006年第4期13卷 73-76页

作者： SHAN jiang-dong TIAN Xiao-jian DENG jun zhang Shuang College of Electronic Science and Engineering Jilin University Changchun 130012 China

According to the parameters and applications of laser diode （LD）, three protection circuits were designed： the time-delay soft-start protection circuit, the power-on impulse protection circuit and the limit-current protection circuit. In this article, the structure and the principle of every protection circuit have been detailed. From several tests and feedbacks from customers, the expected goals have been completed.

关键词： LD protection circuits time-delay soft-start protection circuit power-on impulse protection circuit limit-current protection circuit