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Noninvasive beam diagnosis based on the TM_(010)mode

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Nuclear Science and Techniques 2024年第7期35卷 115-125页

作者： Chuang-Ye Song wen-hui Huang Department of Engineering Physics Tsinghua University BeijingBeijing100084China of Education Beijing100084China

A resonant cavity based on the TM_(010)mode is an effective tool for noninvasive beam characterization. This technique has the advantages of a high signal-to-noise ratio, compact structure, and is related to multiple parameters compared with other beam monitors. In this study, high-precision measurements of the bunch charge, arrival time, bunch length, and energy parameters based on the TM_(010)mode are discussed. A cavity beam arrival time monitor(BAM) utilizing a phase cavity has been widely used in many facilities. Regarding bunch-length measurements, the influence of the beam energy, beam offset,and longitudinal spectrum on the TM_(010)mode are carefully considered to reduce errors, and the theoretical resolution of two cavities with different frequencies is analyzed. Owing to the dependence of the beam velocity of the beam loss factor, this method can also be used for the detection low beam energy using two cavities with the same frequency but different cavity lengths. A set of three cavities with different lengths and frequencies of 1.902 and 11.424 GHz is presented for measuring the four aforementioned parameters.

关键词： TM_(010)mode Noninvasive diagnosis Beam length Low energy

Improved sample added LMMSE receiver based on interference mitigation for HSDPA downlink

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The Journal of China Universities of Posts and Telecommunications 2008年第2期15卷 39-44页

作者： CHE wen ZHAO hui WANG wen-bo Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications Beijing 100876 China

In the downlink of wideband code division multiple access （WCDMA） or WCDMA- high speed downlink packet access （HSDPA） system, the frequency reuse factor is equal to 1, which leads to more possible co-channel interference from neighbor cells. In this situation, user equipment（UE） with traditional receiver will suffer from significant performance degradation at the edge of the cell. To solve this problem, a receiver structure considering interference mitigation has been proposed for long term evolution（LTE） of third-generation partnership project （3GPP）. Such receiver makes use of all the interfering cells＇ channel information to perform a linear minimum mean square error （LMMSE） equalization algorithm. In this article, an improved equalization algorithm is presented, which simply adds more samples to perform one equalization operation. Simulations show that the proposed algorithm can obtain a considerable performance improvement in frequency selective fading channel, with relative little additional complexity introduced.

关键词： LMMSE HSDPA equalizer

Chromatin Remodeling in Stem Cell Maintenance in Arabidopsis thaliana

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Molecular Plant 2009年第4期2卷 600-609页

作者： wen-hui Shen Lin Xu Institut de Biologie Moleculaire des Plantes (IBMP) du CNRS Universite de Strasbourg (UdS) 12 rue du General Zimmer 67084 Strasbourg Cedex France Present address: National Key Laboratory of Plant Molecular Genetics Shanghai Institute of Plant Physiology and Ecology Chinese Academy of Sciences Shanghai 200032 China

Pluripotent stem cells are able to both self-renew and generate undifferentiated cells for the formation of new tissues and organs. In higher plants, stem cells found in the shoot apical meristem （SAM） and the root apical meristem （RAM） are origins of organogenesis occurring post-embryonically. It is important to understand how the regulation of stem cell fate is coordinated to enable the meristem to constantly generate different types of lateral organs. Much knowledge has accumulated on specific transcription factors controlling SAM and RAM activity. Here, we review recent evidences for a role of chromatin remodeling in the maintenance of stable expression states of transcription factor genes and the control of stem cell activity in Arabidopsis.

关键词： chromatin structure and remodeling epigenetics meristem development histone chaperone histone modification.

The Polycomb Complex PRC1:Composition and Function in Plants

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Journal of Genetics and Genomics 2013年第5期40卷 231-238页

作者： Anne Molitor wen-hui Shen Institut de Biologie Moléculaire des Plantes du CNRS Université de Strasbourg12 rue du Général Zimmer67084 StrasbourgFrance Institut J.-P.Bourgin UMR1318 INRA-AgroParisTechINRAroute de Saint Cyr78026 VersaillesFrance

Polycomb group（PcG） proteins are crucial epigenetic regulators conferring transcriptional memory to cell *** assemble into multi-protein complexes,e.g.,Polycomb Repressive Complex 1 and 2（PRC1,PRC2）,which are thought to act in a sequential manner to stably maintain gene ***2 induces histone H3 lysine 27（H3K27） trimethylation（H3K27me3）,which is subsequently read by PRCl that further catalyzes H2A monoubiquitination（H2Aub1）,creating a transcriptional silent chromatin ***2 components are conserved in plants and have been extensively characterized in *** contrast,PRCl composition and function are more diverged between animals and *** more recently,PRC1 existence in plants has been *** we review the aspects of plant specific and conserved PRC1 and highlight critical roles of PRC1 components in seed embryonic trait determinacy,shoot stem cell fate determinacy,and flower development in Arabidopsis.

关键词： Epigenetics Chromatin Histone modifications Polycomb PRC1 Arabidopsis development

States and transitions in mixed networks

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Frontiers of physics 2014年第4期9卷 523-528页

作者： Ying Zhang wen-hui Wan Department of Physics Beijing Normal University Beijing 100875 China Department of Physics Beijing Institute of Technology Beijing 100081 China

A network is named as mixed network if it is composed of N nodes, the dynamics of some nodes are periodic, while the others are chaotic. The mixed network with all-to-all coupling and its correspond- ing networks after the nonlinearity gap-condition pruning are investigated. Several synchronization states are demonstrated in both systems, and a first-order phase transition is proposed. The mixture of dynamics implies any kind of synchronous dynamics for the whole network, and the inixed networks may be controlled by the nonlinearity gap-condition pruning.

关键词： mixed network phase transition synchronization state

Identification of a dual functional betulinic acid analog for the treatment of osteoarthritis by phenotypic screening

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Science China Life Sciences 2025年第1期 300-302页

作者： Ze-Min Lin Mai Xiang wen-hui Wei Shu-hui Fan Li Chen Jie Wang Xiao-Qian Yang Chun-Hao Yang Shi-Jun He Jian-Ping Zuo Laboratory of Immunopharmacology State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of Sciences School of Pharmacy University of Chinese Academy of Sciences School of Pharmacy Nanjing University of Chinese Medicine State Key Laboratory of Drug Research Department of Medicinal ChemistryShanghai Institute of Materia MedicaChinese Academy of Sciences Innovation Research Institute of Traditional Chinese Medicine Shanghai University of Traditional Chinese Medicine Experiment Center for Science and Technology Shanghai University of Traditional Chinese Medicine

Dear Editor, Phenotypic drug discovery, which observes compound effects on physiology,has given way to targeting specific molecules, but has revived by using modern methods to find drugs based on therapeutic outcomes in disease models(Vincent et al., 2022). Osteoarthritis(OA) is a prevalent chronic joint disorder, primarily affecting knee joints, with osteoclast activation due to low-grade inflammation resulting in increased bone resorption and structural changes in the joint(Katz et al.,2021).

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A topographical model for precipitation pattern in the Tibetan Plateau

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Journal of Mountain Science 2016年第5期13卷 763-773页

作者： QI wen-wen ZHANG Bai-ping YAO Yong-hui ZHAO Fang ZHANG Shuo HE wen-hui State Key Laboratory of Resource and Environment Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Belting 100049China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development andApplication Nanjing 210023China

As the highest and most extensive plateau on earth, the Tibetan Plateau has strong thermo- dynamic effect, which not only affects regional climate around the plateau but precipitation patterns of scattered meteorological also temperature and itself. However, due to stations, its spatial precipitation pattern and, especially, the mechanism behind are poorly understood. The availability of spatially consistent satellite-derived precipitation data makes it possible to get accurate precipitation pattern in the plateau, which could help quantitatively explore the effect and mechanism of mass elevation effect on precipitation pattern. This paper made full use of TMPA 3B43 V7 monthly precipitation data to track the trajectory of precipitation and identified four routes （east, southeast, south, west directions） along which moisture-laden air masses move into the plateau. We made the assumption that precipitation pattern is the result interplay of these four moisture- laden air masses transportation routes against the distances from moisture sources and the topographic barriers along the routes. To do so, we developed a multivariate linear regression model with the spatial distribution of annual mean precipitation as the dependent variable and the topographical barriers to these four moisture sources as independent variables. The result shows that our model could explain about 7o% of spatial variation of mean annual precipitation pattern in the plateau; the regression analysis also shows that the southeast moisture source （the Bay of Bengal） contributes the most （32.56%） to the rainfall pattern of the plateau; the east and the south sources have nearly the same contribution, 23.59% and 23.48%, respectively; while the west source contributes the least, only 2o.37%. The findings of this study can greatly improve our understanding of mass elevation effect on spatial precipitation pattern.

关键词： Tibetan Plateau Precipitation pattern Topography Moisture sources

Stabilities of Flexible Electrochemical Capacitors Based on Polypyrrole/Carbon Fibers in Different Gel Electrolytes

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Chinese Journal of Polymer Science 2017年第8期35卷 961-973页

作者： ya-hui chang wen zhou 韩高义 yun-zhen chang 肖尧明 wen-hui ma The Institute of Molecular Science Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Shanxi University Taiyuan 030006 China

Flexible electrochemical capacitors（ECs） are vitally important as the emerging flexible *** have prepared polypyrrole doped with counter ion of Cl-on carbon fibers（PPy-Cl/CFs） via the simple electrochemical deposition *** flexible ECs based on PPy-Cl/CFs electrodes have been assembled by using H_3PO_4/poly（vinyl alcohol）（PVA）,H_2SO_4/PVA,LiClO_4/PVA,KCl/PVA and Li Cl/PVA as gel *** capacitive properties of ECs have been systematically evaluated with electrochemical *** results show that the cells with H_3PO_4/PVA electrolyte exhibit good cyclic stability（91.5% retention after 15000 cycles） although PPy-Cl/CFs has moderate specific capacitance in H_3PO_4/PVA（41.6 m F·cm^-1 or 52.0 F·cm^-3）.However,the ECs in other electrolytes have poor cyclic *** electrochemical analysis reveals that the doping/dedoping processes of PPy-Cl/CFs are different in the five electrolytes,and X-ray photoelectron spectra demonstrate that the ratios of counter anions in PPy＇s oxidized states to those in reduced states are obviously different when PPy-Cl/CFs are kept in reduced or oxidized states in the five *** results also illustrate why the capacitors using H_3PO_4/PVA as electrolyte exhibit good cyclic ***,a light emitting diode（LED） with a threshold voltage of 2.5 V can be lighted by three ECs connected in series.

关键词： oxidized electrolyte systematically assembled capacitive retention vinyl connected photoelectron capacitance

Analysis of Crystallization Behavior of Mold Fluxes Containing TiO_2 Using Single Hot Thermocouple Technique

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Journal of Iron and Steel Research International 2016年第4期23卷 322-328页

作者： Yun LEI Bing XIE wen-hui MA State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology College of Materials Science and Engineering Chongqing University

The crystallization behavior of mold fluxes containing 0-8 mass% TiO2 was investigated using the single hot therrnocouple technique （SHTT） and X ray diffraction （XRD） to study the possible effects on the coordination of heat transfer control and strand lubrication for casting crack sensitive peritectic steels. Time-temperature-transforma tion （TTT） and continuous-cooling transformation （CCT） curves were plotted using the data obtained from SHTT to characterize the crystallization of the mold fluxes. The results showed that crystallization of the mold fluxes during isothermal and non-isothermal processes was suppressed with TiO2 addition. From the TTT curves, it could be seen that the incubation and growth time of crystallization increased significantly with TiO2 addition. The CCT curves showed that the crystallization temperature initially decreased, and then suddenly increased with increasing the TiO2 content. XRD analysis suggested the presence of cuspidine in the mold fluxes with lower TiO2 content （〈4 mass%） , while both perovskite and cuspidine were detected in the mold fluxes when the TiO2 content was increased to 8 mass%. In addition, the growth mechanisms of the crystals changed during the isothermal crystallization process from interface controlled growth to diffusion-controlled growth with increasing the TiO2 content.

关键词： mold flux single hot thermocouple technique kinetics crystallization TTT curve CCT curve