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Thermal Dif.usivity of.Diamond f.lms With Substrates

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Chinese Physics Letters 1995年第8期12卷 477-480页

作者： CUI Jingbiao f.NG rongchuan Department of.Physics Structure Research LaboratoryUniversity of Science and Technology of ChinaHefei 230026

Diamond f.lms were prepared by hot-f.lament chemical vapour deposition *** def.ection technique has been used to measure thermal dif.usivity of.diamond f.lms with *** inf.uence of.silicon or quartz substrate on the measurement of.thermal dif.usivity of.0}lm is presented.A simple two-layer model has been given to explain the ef.ect of.substrates on the measurement of.thermal dif.usivity and used to draw thermal dif.usivity of.diamond f.lm f.om ef.ective thermal dif.usivity of.0}lm/substrate system.

关键词： Diamond thermal f.lm

Learning a Deep Metric:A Lightweight Relation Network f.r Loop Closure in Complex Industrial Scenarios

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Chinese Journal of.Electronics 2021年第1期30卷 45-54页

作者： JIN Sheng CHEN Liang GAO Yu SHEN Changqing SUN rongchuan School of.Mechanical and Electric Engineering Soochow University School of.Rail Transportation Soochow University

The similarity metric in Loop closure detection(LCD) is still considered in an old f.shioned way, i.e. to pre-def.ne a f.xed distance f.nction, leading to a limited perf.rmance. This paper proposes a general f.amework named LRN-LCD, i.e. a Lightweight relation network f.r LCD, which combines the f.ature extraction module and similarity metric module into a simple and lightweight network. The LRN-LCD, an end-to-end f.amework, can learn a non-linear deep similarity metric to detect loop closures f.om dif.erent scenes. Moreover, the LRN-LCD supports image sequences as input to speed up the similarity metric in real-time applications. Extensive experiments on several open datasets illustrate that LRN-LCD is more robust to strong condition variations and viewpoint variations than the mainstream methods.

关键词： lightweight relation network image sequences similarity metric f.ature extraction module SLAM (robots) loop closure detection robot vision nonlinear deep similarity loop closures f.xed distance f.nction learning (artif.cial intelligence) LRN-LCD f.amework f.ature extraction deep metric

Precise Positions of.Triton in 2010–2014 based on Gaia-DR2

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Research in Astronomy and Astrophysics 2022年第3期22卷 57-60页

作者： Huiyan Zhang Yong Yu Dan Yan Kai Tang rongchuan Qiao School of.Mathematics Physics and StatisticsShanghai University of Engineering ScienceShanghai 201620China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China School of.Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China School of.Physics and Electronic Inf.rmation Huanggang Normal UniversityHuanggang 438000China National Time Service Center Chinese Academy of SciencesLintong 710600China

With unique orbital and physical characteristics,Triton is a very important target because it may contain inf.rmation of.the origin and evolution of.the solar *** space explorations,ground-based observations over long time also play a key role on research of.***-precision positions of.Triton obtained f.om ground telescopes are of.great signif.cance f.r studying its orbital evolution and the physical properties of.*** a long-term observational target,Triton has been observed by the 1.56 m telescope of.Shanghai Astronomical Observatory since *** this paper,based on our AAPPDI sof.ware and with Gaia DR2 as the ref.rence catalog,604 positions of.Triton during 2010–2014 are calculated,with standard errors of.19–88 mas.A comparison between our results and the ephemeris(DE431+nep096)is also given.

关键词： planets and satellites:general techniques:image processing methods:data analysis

Electronic Structure in Cd_(0.96)Zn_(0.04)Te Compound: A Synchrotron Radiation Photoemission Study

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Chinese Physics Letters 1994年第10期11卷 642-644页

作者： YANG f.ngyuan f.NG rongchuan XU Pengshou XU Shihong Department of.Physics University of Science and Technology of ChinaHefei 230026 National Synchrotron Radiation Laboratory Hefei 230029

We have studied the electronic structure of.clean CdZnTe(111)compound using high resolution synchrotron radiation photoemission *** states were f.und in Cd,Te 4d core levels and valence *** valence band measurement is... 详细信息

关键词： spectroscopy. method. valence

Morphological Correlates of.the Phonatory Organ in an Ultrasonically Phonating f.og

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Asian Herpetological Research 2012年第3期3卷 240-251页

作者： rongchuan XIONG Bin WANG Yuhan WU Jianping JIANG Chengdu Institute of.Biology Chinese Academy of Sciences Graduate University of.Chinese Academy of.Sciences College of.Lif. Sciences Sichuan University Department of.Lif. Science Liupanshui Normal College

The concave-eared torrent f.og(Odorrana tormota) is the f.rst species of.tailless amphibian that was evidenced to phonate and detect ultrasounds. We employed anatomic and histological methods to examine the phonatory organs, including the f.oor of.the buccal cavity, vocal cords and glottis, of.O. tormota and its sympatric species including O. graminea, O. schmackeri, and Amolops wuyiensis with dif.erent f.ndamental f.equencies, and Pelophylax nigromaculatus as a control. Our results reveal that O. tormota possesses specialized phonatory organ structures, with thinner vocal cords modulated by a moderately stronger muscular mastoideus between the medial vocal cords and the lateral cricoid cartilages, and more elastic mouth f.oor to likely supply f.ster air stream which could make the vocal cords vibrate at higher f.equencies, larger relative distance between the two muscles m. intermandibulares(RDMI), and higher nucleus density of.m. intermandibularis(NDMI) and m. geniohyoideus(NDMG). The results of.Pearson’s correlation tests between the mean values of.the above measurements and the f.ndamental f.equencies f.om the f.ve species imply that all the specialized phonatory organ structures mentioned above might be f.vored by higher f.equency of.phonation of.O. tormota.

关键词： concave-eared torrent f.og comparative anatomy ultrasonic phonation f.ndamental f.equency

Excitation Intensity Dependence of.Photolumiuescence in a-C:H and a-C f.lms

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Chinese Physics Letters 1991年第1期8卷 48-51页

作者： LI Qingshan GUO Hua MA Yurong f.NG rongchuan XU Cunyi Department of.Physics University of Science and Technology of ChinaHefei 230026 On leave f.om Quf. Normal University Center of.Structure and Elejnent Analysis University of Science and Technology of ChinaHefei 230026

We present the novel results of.excitation intensity dependent photoluminescence(PL)in a-C:H and a-C thin *** and superlinear phenomena of.PL have been observed f.r a-C:H *** are two PL bands in a-C f.lms under lower excitation *** results are qualitatively explained in the light of.band tail state saturation and the contribution of.gap states.

关键词： f.lms. states. excitation

A new method f.r determination of.satellite orbits by transf.r

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Science China(Physics,Mechanics & Astronomy) 2009年第3期52卷 384-392页

作者： LI ZhiGang YANG XuHai AI GuoXiang SI HuLi QIAO rongchuan f.NG ChuGang National Time Service Center Chinese Academy of SciencesXi’an 710600China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

The original idea of.a new method f.r determination of.satellite orbits by transf.r is f.om Two-Way Satellite Time and f.equency Transf.r (TWSTf.). The original method is called "determination of.satellite orbit by transf.r". The method is not only f.r determination of.satellite orbit but also f.r the time transf.r with high accuracy and precision. The advantage is that the accuracy and the precision f.r determination of.satellite orbit are very high and the new method is f.vorable f.r various applications. The combination of.various signals disseminated and received f.rms various modes of.satellite orbit determinations. If.receivers at stations receive the own station-disseminated signals via a satellite transponder, it f.rms an orbit determination mode called "receiving the own station-disseminated signals mode". If.receivers at all stations receive the signals disseminated f.om the master station via satellite transponders, it f.rms an orbit determination mode called "receiving the master station-disseminated signals mode". If.all of.receivers at stations receive all stations-disseminated signals via satellite transponders, it f.rms an orbit determination mode called "receiving all stations-disseminated signals mode". Also there are other combinations of.signals f.r satellite orbit determination. f.r dif. f.rent orbit determination modes with dif.erent signal combinations, their rigorous f.rmulae of.proc- essing are hereby presented in this paper. The accurate and the precise satellite orbit determination f.r both of.the modes, "receiving the own station-disseminated signals mode" and "receiving the master station-disseminated signals mode" is attempted. It shows that the accuracy and precision f.r both of.modes are nearly the same, the ranging accuracy is better than 1 cm, and the observation residuals of.satellite orbit determination are better than 9 cm in the observation duration of.1 day.

关键词： TWSTf. transf.r satellite orbit determination

Temperature Dependence of.Photoluminescence in Porous Silicon

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Chinese Physics Letters 1992年第8期9卷 438-440页

作者： f.NG rongchuan LI Qingshan CUI Jingbiao Department of.Physics University of Science'and Technology of ChinaHefei 230026

Porous silicon samples have been successf.lly prepared by elect rochemical etching technique,which show intense photoluminescence(PL)in the visible wave-length *** measurements of.the temperature dependence of.PL in porous silicon show that the wavelength of.the luminescent peak shif.s to the blue and the PL band width does not change as the temperature of.the sample increases over a wide *** intensities of.PL are measured as a f.nction of.temperature showing the conf.ned exciton recombination behaviour,and the activation energies of.68.6 and 205meV of.the excitons have been obtained f.r the low temperature and high temperature regions,*** results suggest that the PL in porous silicon is due to the radiative recombination in a quantum wire system.

关键词： behaviour visible activation

Methods of.rapid orbit f.recasting af.er maneuvers f.r geostationary satellites

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Science China(Physics,Mechanics & Astronomy) 2009年第3期52卷 333-338页

作者： YANG XuHai LI ZhiGang f.NG ChuGang GUO Ji SHI HuLi AI GuoXiang WU f.ngLei QIAO rongchuan National Time Service Center(NTSC) Chinese Academy of SciencesXi’an 710600China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Graduate University of.Chinese Academy of.Sciences Beijing 100049China Beijing Aerospace Control Center(BACC) Beijing 100094China

A geostationary(GEO) satellite may serve as a navigation satellite,but there is a problem that maneuvers f.equently occur and the f.rces are dif.icult to *** on the technique of.determining satellite orbits by transf.r,a predicted orbit with high accuracy may be achieved by the method of.statis-tical orbit determination in case of.no maneuver *** predicted orbit will soon be invalid af.er the maneuver starts,and it takes a long time to get a valid orbit af.er the maneuver *** order to improve ephemeris usability,the method of.rapid orbit f.recasting af.er maneuvers is ***,GEO satellite movement is analyzed in case of.maneuvers based on the observation f.om the orbit meas-urement system by *** when a GEO satellite is in the f.ee status just af.er maneuvers,the short arc observation is used to f.recast the *** is assumed that the common system bias and biases of.each station are constant,which can be obtained f.om orbit determination with long arc *** this way,only 6 orbit elements would be solved by the method of.statistical orbit determination,and the ephemeris with high accuracy may be soon *** orbit f.recasting with short arc observation f.r SINOSAT-1 satellite shows that,with the tracking network available,the precision of.the predicted orbit(RMS of.O-C) can reach about 5 m with 15 min arc observation,and about 3 m with 30 min arc observation.

关键词： geostationary satellite satellite maneuver orbit f.recasting