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Journal of Modern Power systems and Clean Energy 2019年第6期7卷 1585-1595页

作者： Lei DONG Jia LI Tianjiao pu Naishi chen Power System Research institute North China Electric Power UniversityBeijing 102206China china Electric Power Research institute Beijing 100192China

To ensure the safety and reliability of the distribution network and adapt to the uncertain development of renewable energy sources and loads,a two-stage distributionally robust optimization model is proposed for the active distribution network(ADN)optimization problem considering the uncertainties of the source and load in this *** establishing an ambiguity set to capture the uncertainties of the photovoltaic(PV)power,wind power and load,the piecewise-linear function and auxiliary parameters are introduced to help characterize the probability distribution of uncertain *** optimization goal of the model is to minimize the total expected cost under the worst-case distribution in the ambiguity *** first-stage expected cost is obtained based on the predicted value of the uncertainty *** second-stage expected cost is based on the actual value of the uncertainty variable to solve the first-stage *** generalized linear decision rule approximates the two-stage optimization model,and the affine function is introduced to provide a closer approximation to the second-stage optimization ***,the improved IEEE 33-node and IEEE 118-node systems are simulated and analyzed with deterministic methods,stochastic programming,and robust optimization methods to verify the feasibility and superiority of the proposed model and algorithm.

关键词： Active distribution network(ADN) Source-load uncertainty Two-stage distributionally robust optimization Ambiguity set Generalized linear decision rule

A novel requirement analysis approach for periodic control systems

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Frontiers of Computer science 2013年第2期7卷 214-235页

作者： Zheng WANG Geguang pu Jiangwen LI Yuxiang chen Yongxin ZHAO Mingsong chen Bin GU Mengfei YANG Jifeng HE Shanghai key laboratory of Trustworthy Computing Software Engineering Institute East China Normal UniversityChina Shanghai 200241 beijing institute of control Engineering China Beijing 100080 School of Computing National University of SingaporeSingapore Singapore 119077 china academy of Space Technology China Beijing 100094

Periodic control systems （PCSs） are widely used in real-time embedded system domain. However, traditional manual requirement analysis assumes the expert knowledge, which is laborious and error-prone. This paper proposes a novel requirement analysis approach, which supports the automated validation of the informal requirement specifi- cations. Based on the normalized initial requirement docu- ments, our approach can construct an intermediate SPARDL model with both formal syntax and semantics. To check the overall system behaviors, our approach can transform the SPARDL models into executable code for simulation. The derived prototype simulator from SPARDL models enables the testing-based system behavior validation. Moreover, our approach enables the analysis of the dataflow relations in SPARDL models. By revealing input/output and affecting re- lations, our dataflow analysis techniques can help software engineers to figure out the potential data dependencies be- tween SPARDL modules. This is very useful for the module reuse when a new version of the system is developed. A study of our approach using an industry design demonstrates the practicality and effectiveness of our approach.

关键词： SPARDL simulation dataflow analysis codegeneration

Coordination cage with structural “defects” and open metal sites catalyzes selective oxidation of primary alcohols

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science china Chemistry 2023年第6期66卷 1714-1721页

作者： Tian-pu Sheng Ying Wei Parvathi Jampani Chang Li Feng-Rong Dai Shuping Huang Zhenqiang Wang Zhong-Ning chen State key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry Fuzhou UniversityFuzhou 350108China University of chinese academy of sciences Beijing 100049China Department of Chemistry&Center for Fluorinated Functional Materials University of South DakotaVermillionSDUSA

Coordination cages with intrinsic enzyme-like activity are a class of promising catalysts for improving the efficiency of organic *** present herein a viable strategy to conveniently construct multimetallic active sites into a coordination cage via self-assembly of a pre-formed sulfonylcalix[4]arene-based tetranuclear copper(II)precursor and an amino-functionalized dicarboxylate *** cage exhibits a“defective”,partially open cylindrical structure and features coordinatively labile dimetallic Cu(II)*** by this unique inner cavity environment,promising catalytic activity toward selective oxidation of primary alcohols to carboxylic acids at room temperature is *** studies reveal that the coordinatively labile dimetallic Cu(II)sites can efficiently capture and activate the substrate and oxidant to catalyze the reaction,while the confined nano-cavity environment modulates substrate binding and enhances the catalytic *** study provides a new approach to designing biomimetic multifunctional coordination cages and environmentally friendly supramolecular catalysts.

关键词： coordination cages open metal sites alcohol oxidation host-guest systems supramolecular chemistry

Crystal structure of SARS-CoV-2 papain-like protease

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Acta Pharmaceutica Sinica B 2021年第1期11卷 237-245页

作者： Xiaopan Gao Bo Qin pu chen Kaixiang Zhu Pengjiao Hou Justyna Aleksandra Wojdyla Meitian Wang Sheng Cui NHC key laboratory of systems Biology of Pathogens Institute of Pathogen BiologyChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China The Swiss Light Source(SLS)at the Paul Scherrer Institut Villigen 5232Switzerland

The pandemic of coronavirus disease 2019(COVID-19)is changing the world like never *** crisis is unlikely contained in the absence of effective therapeutics or *** papain-like protease(PLpro)of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)plays essential roles in virus replication and immune evasion,presenting a charming drug *** the PLpro proteases of SARS-CoV-2 and SARS-CoV share significant homology,inhibitor developed for SARS-CoV PLpro is a promising starting point of therapeutic *** this study,we sought to provide structural frameworks for PLpro inhibitor *** determined the unliganded structure of SARS-CoV-2 PLpro mutant C111 S,which shares many structural features of SARS-CoV *** crystal form has unique packing,high solvent content and reasonable resolution 2.5 A°,hence provides a good possibility for fragment-based screening using crystallographic *** characterized the protease activity of PLpro in cleaving synthetic peptide harboring nsp2/nsp3 *** demonstrate that a potent SARS-CoV PLpro inhibitor GRL0617 is highly effective in inhibiting protease activity of SARSCoV-2 with the IC50 of 2.2?0.3 mmol/*** then determined the structure of SARS-CoV-2 PLpro complexed by GRL0617 to 2.6 A°,showing the inhibitor accommodates the S3 e S4 pockets of the substrate binding *** binding of GRL0617 induces closure of the BL2 loop and narrows the substrate binding cleft,whereas the binding of a tetrapeptide substrate enlarges the ***,our results suggest a mechanism of GRL0617 inhibition,that GRL0617 not only occupies the substrate pockets,but also seals the entrance to the substrate binding cleft hence prevents the binding of the LXGG motif of the substrate.

关键词： SARS-CoV-2 PLpro Proteinase inhibitor Crystal structure Antiviral drug Drug design

A novel contact engineering method for transistors based on two-dimensional materials

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Journal of Materials science & Technology 2021年第10期69卷 15-19页

作者： Yaochen Sheng LuFang Zhang Feng Li Xinyu chen Zhijian Xie Haiyan Nan Zihan Xu David Wei Zhan Jianhao chen Yong pu Shaoqing Xiao Wenzhong Bao State key laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Engineering Research Center of IoT Technology Applications(Ministry of Education) Department of Electronic EngineeringJiangnan UniversityWuxi 214122China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China New Energy Technology Engineering laboratory of Jiangsu Province&School of science Nanjing University of Posts and TelecommunicationsNanjing 210023China Six Carbon Tech ShenzhenShenzhen 518106China

Contact engineering is of critical importance for two-dimensional(2D)transition metal dichalcogenide(TMD)-based ***,there are only a few solutions to overcome this obstacle because of the complexity of the TMD-contact *** this work,we propose a novel method using a soft plasma treatment followed by the seamless deposition of a metal electrode to reduce the contact resistance of MoS_(2)field effect transistors(FETs).The treated FETs exhibit three times higher mobility than the control FETs without plasma *** soft plasma treatment can remove the facial sulfur atoms and expose the middle Mo atoms so that they come into direct contact with the metal electrode,thus greatly improving the contact ***-principles calculation is also performed to support the experimental *** potentially scalable strategy can be extended to the whole family of TMD based FETs to provide a possible route of device processsing technology for 2D device application.

关键词： Electrical contact resistance MoS_(2) Plasma

Simultaneously enhancing capacity and security in free-space optical chaotic communication utilizing orbital angular momentum

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Photonics Research 2023年第12期11卷 2185-2193页

作者： YIQUN ZhanG MINGFENG XU MINGBO pu MENGJIE ZHOU JIAZHENG DING SHUANGchenG chen KUN QIU NING JIANG XIANGANG LUO School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China State key laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China School of Optoelectronics University of Chinese Academy of SciencesBeijing 100049China Tianfu Xinglong Lake laboratory Chengdu 610299China

Optical chaotic signals emitted from an external-cavity feedback or injected laser diode enable small-signal information concealment in a noise-like carrier for secure optical *** to the chaotic bandwidth limitation resulting from intrinsic relaxation oscillation frequency of lasers,multiplexing of optical chaotic signal,such as wavelength division multiplexing in fiber,is a typical candidate for high-capacity secure ***,to our best knowledge,the utilization of the spatial dimension of optical chaos for free-space secure communication has not yet been ***,we experimentally demonstrate a free-space all-optical chaotic communication system that simultaneously enhances transmission capacity and security by orbital angular momentum(OAM)*** chaotic signals with two different OAM modes totally carrying 20 Gbps on-off keying signals are secretly transmitted over a 2 m free-space link,where the channel crosstalk of OAM modes is less than-20 d B,with the mode spacing no less than *** receiver can extract valid information only when capturing approximately 92.5% of the OAM beam and correctly demodulating the corresponding *** error rate below the 7%hard-decision forward error correction threshold of 3.8×10^(-3)can be achieved for the intended ***,a simulated weak turbulence is introduced to comprehensively analyze the influence on the system performance,including channel crosstalk,chaotic synchronization,and transmission *** work may inspire structured light application in optical chaos and pave a new way for developing future high-capacity free-space chaotic secure communication systems.

关键词： communication chaotic momentum

Visualization of the electronic phase separation in superconducting K_(x)Fe_(2−y)Se_(2)

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Nano Research 2021年第3期14卷 823-828页

作者： Yujie chen Juan Jiang Haifeng Yang Pavel Dudin Alexey Barinov Zhongkai Liu Haihu Wen Lexian Yang Yulin chen State key laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing100084China Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxfordOX13PUUK Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA94720USA School of Physical science and Technology ShanghaiTech University and CAS-Shanghai Science Research CenterShanghai201210China L’Orme des Merisiers Synchrotron SOLEILSaint Aubin-BP 4891192Gif sur Yvette CedexFrance Elettra-Sincrotrone Trieste TriesteBasovizza34149Italy ShanghaiTech laboratory for Topological Physics Shanghai200031China National laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Frontier science Center for Quantum Information Beijing100084China

Type-II iron-based superconductors(Fe-SCs),the alkali-metal-intercalated iron selenide A_(x)Fe_(2−y)Se_(2)(A=K,Tl,Rb,etc.)with a superconducting transition temperature of 32 K,exhibit unique properties such as high Néel temperature,Fe-vacancies ordering,antiferromagnetically ordered insulating state in the phase diagram,and mesoscopic phase separation in the superconducting *** particular,the electronic and structural phase separation in these systems has attracted intensive attention since it provides a platform to unveil the insulating parent phase of type-II Fe-SCs that mimics the Mott parent phase in *** this work,we use spatial-and angle-resolved photoemission spectroscopy to study the electronic structure of superconducting K_(x)Fe_(2−y)Se_(2).We observe clear electronic phase separation of K_(x)Fe_(2−y)Se_(2) into metallic islands and insulating matrix,showing different K and Fe *** the metallic islands show strongly dispersive bands near the Fermi level,the insulating phase shows an energy gap up to 700 meV and a nearly flat band around 700 meV below the Fermi energy,consistent with previous experimental and theoretical results on the superconducting K_(1−x)Fe_(2)Se_(2)(122 phase)and Fe-vacancy ordered K_(0.8)Fe_(1.6)Se_(2)(245 phase),*** results not only provide important insights into the mysterious composition of phase-separated superconducting and insulating phases of K_(x)Fe_(2−y)Se_(2),but also present their intrinsic electronic structures,which will shed light on the comprehension of the unique physics in type-II Fe-SCs.

关键词： spatial-and angle-resolved photoemission spectroscopy(µ-ARPES) iron-based superconductors phase separation electronic structure

基于双重信息检索的Bash代码注释生成方法

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软件学报 2023年第3期34卷 1310-1329页

作者：陈翔于池杨光濮雪莲崔展齐南通大学信息科学技术学院江苏南通226019 信息安全国家重点实验室(中国科学院信息工程研究所) 北京100093 南通大学经济与管理学院江苏南通226019 北京信息科技大学计算机学院北京100101

Bash是Linux默认的shell命令语言.它在Linux系统的开发和维护中起到重要作用.对不熟悉Bash语言的开发人员来说,理解Bash代码的目的和功能具有一定的挑战性.针对Bash代码注释自动生成问题提出了一种基于双重信息检索的方法 ExplainBash.... 详细信息

Bash是Linux默认的shell命令语言.它在Linux系统的开发和维护中起到重要作用.对不熟悉Bash语言的开发人员来说,理解Bash代码的目的和功能具有一定的挑战性.针对Bash代码注释自动生成问题提出了一种基于双重信息检索的方法 ExplainBash.该方法基于语义相似度和词法相似度进行双重检索,从而生成高质量代码注释.其中,语义相似度基于CodeBERT和BERT-whitening操作训练出代码语义表示,并基于欧式距离来实现;词法相似度基于代码词元构成的集合,并基于编辑距离来实现.以NL2Bash研究中共享的语料库为基础,进一步合并NLC2CMD竞赛共享的数据以构造高质量语料库.随后,选择了来自代码注释自动生成领域的9种基准方法,这些基准方法覆盖了基于信息检索的方法和基于深度学习的方法.实证研究和人本研究的结果验证了ExplainBash方法的有效性.然后设计了消融实验,对ExplainBash方法内设定(例如检索策略、BERT-whitening操作等)的合理性进行了分析.最后,基于所提方法开发出一个浏览器插件,以方便用户对Bash代码的理解.

关键词：程序理解 Bash代码代码注释生成信息检索代码语义代码词法

Transition toward thorium fuel cycle in a molten salt reactor by using plutonium

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Nuclear science and Techniques 2017年第10期28卷 103-112页

作者： De-Yang Cui Shao-Peng Xia Xiao-Xiao Li Xiang-Zhou Cai Jin-Gen chen Shanghai institute of Applied Physics Chinese Academy ofSciencesShanghai 201800China CAS Innovative Academies in TMSR Energy System Chinese Academy of SciencesShanghai 201800China University of chinese academy of sciences Beijing 100049China

The molten salt reactor(MSR), as one of the Generation Ⅳ advanced nuclear systems, has attracted a worldwide interest due to its excellent performances in safety, economics, sustainability, and proliferation resistance. The aim of this work is to provide and evaluate possible solutions to fissile 233 U production and further the fuel transition to thorium fuel cycle in a thermal MSR by using plutonium partitioned from light water reactors spent fuel. By using an in-house developed tool, a breeding and burning(B&B) scenario is first introduced and analyzed from the aspects of the evolution of main nuclides, net 233 U production, spectrum shift, and temperature feedback coefficient. It can be concluded that such a Th/pu to Th/^(233)U transition can be accomplished by employing a relatively fast fuel reprocessing with a cycle time less than 60 days. At the equilibrium state, the reactor can achieve a conversion ratio of about 0.996 for the 60-day reprocessing period(RP) case and about 1.047 for the 10-day RP *** results also show that it is difficult to accomplish such a fuel transition with limited reprocessing(RP is 180 days),and the reactor operates as a converter and burns the plutonium with the help of thorium. Meanwhile, a prebreeding and burning(PB&B) scenario is also analyzed briefly with respect to the net 233 U production and evolution of main nuclides. One can find that it is more efficient to produce 233 U under this scenario, resulting in a double time varying from about 1.96 years for the 10-day RP case to about 6.15 years for the 180-day RP case.

关键词：钍燃料循环反应器熔盐堆先进核能系统钚循环时间轻水反应堆燃料后处理

A joint call for actions to advance taxonomy in china

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Zoological Systematics 2022年第3期47卷 188-197页

作者： Chaodong Zhu Arong Luo Ming Bai Michael COrr Zhonge Hou Siqin Ge Jun chen Yibo Hu Xuming Zhou Gexia Qiao Hongzhi Kong Limin Lu Xiaohua Jin Lei Cai Xinli Wei Ruilin Zhao Wei Miao Qingfeng Wang Zhongli Sha Qiang Lin Meng Qu Jianping Jiang Jiatang Li Jing Che Xuelong Jiang Xiaoyong chen Lianming Gao Zongxin Ren Chunlei Xiang Shixiao Luo Donghui Wu Dong Liu Yanqiong Peng Tao Su chenyang Cai Tianqi Zhu Wanzhi Cai Xingyue Liu Hu Li Huaijun Xue Zhen Ye Xuexin chen pu Tang Shujun Wei Hong Pang Qiang Xie Feng Zhang Feng Zhang Xianjin Peng Aibing Zhang Taiping Gao Changfa Zhou chen Shao Libin Ma Zhaoming Wei Yunxia Luan Ziwei Yin Wu Dai Cong Wei Xiaolei Huang Jingxian Liu Xiangsheng chen Tianci Yi Zhisheng Zhang Zhulidezi Aishan Qin Li Hongying Hu CAS key laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China CAS key laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China State key laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China State key laboratory of Mycology(SKLM) Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China CAS key laboratory of Aquatic Biodiversity and Conservation Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Wuhan Botanical Garden Chinese Academy of SciencesWuhan 430074China Department of Marine Organism Taxonomy&Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China CAS key laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China CAS key laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation key laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China State key laboratory of Genetic Resources and Evolution&Yunnan key laboratory of Biodiversity and Ecological Security of Gaoligong Mountain Kunming Institute of ZoologyChinese Academy of SciencesKunming 650221China CAS key laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China CAS key laboratory of Plant Resource Conservation and Sustainable Utilization South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China CAS key laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China CAS key laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMenglaYunnan 66630

Taxonomy plays an important role in understanding the origin, evolution, and ecological functionality of biodiversity. There are large number of unknown species yet to be described by taxonomists, which together with their ecosystem services cannot be effectively protected prior to description. Despite this, taxonomy has been increasingly underrated insufficient funds and permanent positions to retain young talents. Further, the impact factordriven evaluation systems in china exacerbate this downward trend, so alternative evaluation metrics are urgently necessary. When the current generation of outstanding taxonomists retires,there will be too few remaining taxonomists left to train the next generation. In light of these challenges, all co-authors worked together on this paper to analyze the current situation of taxonomy and put out a joint call for immediate actions to advance taxonomy in china.

关键词： Endangered taxonomists morphology-based taxonomy integrative taxonomy capacity building systematics