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Gaussian process tomography based on Bayesian data analysis for soft x-ray and AXUV diagnostics on EAST

Chinese Physics B 2020年第9期29卷 353-363页

作者： Yan Chao Liqing Xu Liqun Hu Yanmin Duan Tianbo wang Yi yuan Yongkuan zhang Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Southwestern Institute for Physics CNNCChengdu 610200China

This work presents the Gaussian process tomography(GPT)based on Bayesian data analysis and its applications in soft x-ray(SXR)and absolute extreme ultraviolet spectroscopy(AXUV)diagnostics on experimental advanced superconducting tokamak(EAST).This is the first application of the GPT method in the AXUV diagnostic system in fusion *** is found that even if only horizontal detector arrays are used to reconstruct the two-dimensional(2D)distribution of SXR and AXUV emissivity fields,the GPT method performs robustly and extremely fast,which enables the GPT method to provide real-time feedback on impurity transport and fast magnetohydrodynamics(MHD)*** reconstructing SXR emissivity in the poloidal cross section on EAST,an m/n=1/1 internal kink mode has been observed,and the plasma redistribution due to the kink mode is clearly visible in the reconstructions,where m is the poloidal mode number and n is the toroidal mode ***-like internal disruptions extended throughout the entire plasma core and mainly driven by the m/n=2/1 mode have been *** the sawtooth-like internal disruption crash phase,the conversion from an m=2 mode to an m=1 mode is *** the reconstructed AXUV emissivity field we were able to observe the process of impurity accumulated in the plasma core and the mitigation of core impurity due to neon injection in the plasma *** data from all other diagnostics involved in the analysis shows that the reconstructions from AXUV measurements are reliable.

关键词： bayesian inference Gaussian process tomography plasma physics

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Performance Analysis of Sparse Array based Massive MIMO via Joint Convex Optimization

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China Communications 2022年第3期19卷 88-100页

作者： Mengting Lou Jing Jin Hanning wang Dan Wu Liang Xia Qixing wang Yifei yuan Jiangzhou wang Future Research Lab China Mobile Research InstituteBeijing 100053China School of Engineering and Digital Arts University of KentCanterburyU.K.

Massive multiple-input multiple-output(MIMO)technology enables higher data rate transmission in the future mobile ***,exploiting a large number of antenna elements at base station(BS)makes effective implementation of massive MIMO challenging,due to the size and weight limits of the masssive MIMO that are located on each ***,in order to miniaturize the massive MIMO,it is crucial to reduce the number of antenna elements via effective methods such as sparse array *** this paper,a multiple-pattern synthesis is considered towards convex optimization(CO).The joint convex optimization(JCO)based synthesis is proposed to construct a codebook for ***,a criterion containing multiple constraints is developed,in which the sparse array is required to fullfill all ***,extensive evaluations are performed under realistic simulation *** results show that with the same number of antenna elements,sparse array using the proposed JCO-based synthesis outperforms not only the uniform array,but also the sparse array with the existing CO-based synthesis ***,with a half of the number of antenna elements that on the uniform array,the performance of the JCO-based sparse array approaches to that of the uniform array.

关键词： B5G 6G sparse array joint convex optimization massive MIMO system-level simulation

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Joint Source-Channel Coding for 6G Communications

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China Communications 2022年第3期19卷 101-115页

作者： Yanfei Dong Jincheng Dai Kai Niu Sen wang Yifei yuan The Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China China Mobile Research Institute Beijing 100876China

In order to provide ultra low-latency and high energy-efficient communication for intelligences,the sixth generation(6G)wireless communication networks need to break out of the dilemma of the depleting gain of the separated optimization *** this context,this paper provides a comprehensive tutorial that overview how joint source-channel coding(JSCC)can be employed for improving overall system *** the purpose,we first introduce the communication requirements and performance metrics for ***,we provide an overview of the source-channel separation theorem and why it may not hold in practical *** addition,we focus on two new JSCC schemes called the double low-density parity-check(LDPC)codes and the double polar codes,respectively,giving their detailed coding and decoding processes and corresponding performance *** a nutshell,this paper constitutes a tutorial on the JSCC scheme tailored to the needs of future 6G communications.

关键词： 6G joint source and channel coding doubel LDPC codes doubel polar codes

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Shear-band spacing controlled by Bridgman solidification in Dendrite/BMG composites

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Science China(Physics,Mechanics & Astronomy) 2009年第10期52卷 1632-1636页

作者： wang Song zhang Yong State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The paper reports that the shear-band spacing can be controlled by the Bridgman solidification technique for a model alloy of *** volume percent of the glass phase is almost independent of the withdrawal *** shear-band spacing reaches a minimum of about 3 μm with withdrawal velocity of 0.8 mm/*** optimized mechanical properties,such as the fracture strength of ～2100 MPa and plastic strain of ～19%,have been *** large plastic deformation is due to the dislocation slips in the dendrite phase and shear-band propagations in the glass phase.

关键词： Shear-band spacing Bridgman solidification BMG composites

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The Direct Discontinuous Galerkin Methods with Implicit-Explicit Runge-Kutta Time Marching for Linear Convection-Diffusion Problems

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Communications on Applied Mathematics and Computation 2022年第1期4卷 271-292页

作者： Haijin wang Qiang zhang School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Mathematics Nanjing UniversityNanjing 210093China

In this paper,a fully discrete stability analysis is carried out for the direct discontinuous Galerkin(DDG)methods coupled with Runge-Kutta-type implicit-explicit time marching,for solving one-dimensional linear convection-diffusion *** the spatial discretization,both the original DDG methods and the refined DDG methods with interface corrections are *** the time discretization,the convection term is treated explicitly and the diffusion term *** the energy method,we show that the corresponding fully discrete schemes are unconditionally stable,in the sense that the time-stepis only required to be upper bounded by a constant which is independent of the mesh size ***-mal error estimate is also obtained by the aid of a special global *** experiments are given to verify the stability and accuracy of the proposed schemes.

关键词： Direct discontinuous Galerkin method Implicit-explicit scheme Stability analysis Energy method Convection-diffusion problem

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Long-term monitoring and source apportionment of PM_(2.5)/PM_(10) in Beijing,China

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Journal of Environmental Sciences 2008年第11期20卷 1323-1327页

作者： wang Hailin ZHUANG Yahui wang Ying SUN Yele yuan Hui ZHUANG Guoshun HAO Zhengping Research Center for Eco-Environmental Sciences The Chinese Academy of Sciences Beijing 100085 China Center for Atmospheric Environmental Study Department of Chemistry Beijing Normal University Beijing 100875 China

During 2001-2006,PM2.5 (particle matter with aerodynamic diameter less than 2.5 microns) and PM10 (particle matter with aerodynamic diameter less than 10 microns) were collected at the Beijng Normal University (BNU) site,China,and in 2006,at a background site in Duolun (DL).The long-term monitoring data of elements,ions,and black carbon showed that the major constituents of PM2.5 were black carbon (BC) crustal elements,nitrates,ammonium salts,and *** five major components accounted for 20%-80% of...

关键词： PM2.5 PM10 monitoring source apportionment

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CSCO guidelines for colorectal cancer version 2022:Updates and discussions

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Chinese Journal of Cancer Research 2022年第2期34卷 67-70页

作者： Zhijun yuan Shanshan Weng Chenyang Ye Hanguang Hu Suzhan zhang Ying yuan Department of Radiation Oncology Key Laboratory of Cancer Prevention and InterventionMinistry of Educationthe Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Medical Oncology the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Colorectal Surgery and Oncology the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Cancer Center Zhejiang UniversityHangzhou 310058China

Colorectal cancer(CRC) is the third most common cancer worldwide and the second most common in tumor-related mortality by Global Cancer Statistics 2020(1). Recent data show that the incidence and mortality of CRC in C... 详细信息

关键词： mortality cancer colorectal

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双偶氮苯-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子的二阶非线性光学性质

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原子与分子物理学报 2025年第2期42卷 15-23页

作者：张宇红李博陈自然李渊徐友辉张莉萍何旭东四川职业技术学院能源化工与环境学院遂宁629000

使用密度泛函理论(DFT)M06-2X方法、采用6-311+g(d,p)基组,分别对26个双偶氮-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子进行结构优化与频率计算;使用含时密度泛函理论(TD-DFT)TD-M06-2X方法计算了a1~d6分子的前线分子轨道与... 详细信息

使用密度泛函理论(DFT)M06-2X方法、采用6-311+g(d,p)基组,分别对26个双偶氮-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子进行结构优化与频率计算;使用含时密度泛函理论(TD-DFT)TD-M06-2X方法计算了a1~d6分子的前线分子轨道与电子吸收光谱,采用有效场FF方法研究了二阶非线性光学性质(NLO).研究结果表明,26个噻蒽四酮类衍生物分子的能隙在1.33—2.02 eV范围,归属于有机半导体;最低能量吸收峰波长在601.8~609.5nm范围;在增大分子的二阶非线性光学系数β_(μ)(或β_(0))值方面,含相同偶氮苯基团或含不同偶氮苯基团分别引入到二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮分子两侧的2,10位优于2,9位,在2,10位分别端接含推、拉基团的偶氮苯优于含相同给电子基团的偶氮苯.在偶氮苯苯环对位分别端接强吸电子基(-NO_(2))与强供电子基(如-N(CH_(3))_(2)、-N(Ph)_(3)、-N-苯基咔唑等)可增强体系的二阶非线性光学性能,获得性能良好的非线性光学材料.

关键词：双偶氮二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮密度泛函理论电子吸收光谱二阶非线性光学性质

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Knoevenagel Condensation of Acetylacetone with AldehydesCatalyzed by a New Catalyst Indium Trichloride

引用

Chinese Chemical Letters 1998年第2期9卷 123-124页

作者： wang, L zhang, YM Hangzhou Univ Dept Chem Hangzhou 310028 Peoples R China

The Knoevenagel condensation of acetylacetone with aldehydes catalyzed by indium trichloride was carried out at room temperature in acetonitrile to give aryl- or alkylideneacetylacetones in moderate to good yields.

关键词： Knoevenagel condensation indium trichloride acetylacetone aldehyde

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Natural Variation of Pto and Fen Genes and Marker-Assisted Selection for Resistance to Bacterial Speck in Tomato

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Agricultural Sciences in China 2011年第6期10卷 827-837页

作者： SUN Wan-yu ZHAO Wan-ying wang yuan-yuan PEI Cheng-cheng YANG Wen-cai Department of Vegetable Science College of Agronomy and Biotechnology China Agricultural University Beijing 100193 P.R.China

The resistance in tomato plants to bacterial speck caused by Pseudomonas syringae pv. tomato is triggered by the interactions between the plant resistance protein Pto and the pathogen avirulence proteins AvrPto or AvrPtoB. Fen is a gene encoding closely related functional protein kinases as the Pto gene. To investigate the status of resistance to the pathogen and natural variation of Pto and Fen genes in tomato, 67 lines including 29 growing in China were subject to disease resistance evaluation and fenthion-sensitivity test. Alleles of Pto and Fen were amplified from genomic DNA of 25 tomato lines using polymerase chain reaction （PCR） and sequences were determined by sequencing the PCR products. The results indicated that none of the 29 cultivars/hybrids growing in China were resistant to bacterial speck race 0 strain DC3000. Seven of eight tomato lines resistant to DC3000 were also fenthion-sensitive. Analysis of deduced amino acid sequences identified three novel residue substitutions between Pto and pto, and one new substitution identified between Fen and fen. A PCR-based marker was developed and successfully used to select plants with resistance to DC3000.

关键词： tomato bacterial speck Pto Fen natural variation marker-assisted selection

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