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Efficient graphene in-plane homogeneous p-n-p junction based infrared photodetectors with low dark current

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Science China(Information Sciences) 2021年第4期64卷 134-141页

作者： Junru AN tian sun Bin WANG Jianlong XU Shaojuan LI State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences (UCAS) Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and Technology

Graphene-based photodetectors have drawn a large amount of interests owing to its wide spectral response,however,the high dark current greatly limits their *** this study,we develop an efficient graphene in-plane homogeneous p-n-p junction based infrared(IR) photodetector with greatly reduced dark *** devices with p-n-p junctions exhibit excellent photoresponse to 1.0～4.0 μm IR light illumination with ultra-low dark current at the order of～10-9A in double p-n-p junctions and 10-13A in three p-n-p junctions based photodetector,which is three and seven orders of magnitude lower than pristine graphene phototransistors,*** excellent IR photodetection capabilities could be attributed to the synergistic effects of in-plane photovoltaic effects as well as the photogating effects induced carrier injection from the silicon *** results suggest intriguing potential of graphene in-plane p-n-p junctions for applications in high-performance IR photodetectors.

关键词： infrared photodetector graphene p-n-p junction dark current photoresponse

Mechanism of lithium insertion into NiSi_2 anode material for lithium ion batteries

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Rare Metals 2006年第z1期25卷 77-81页

作者： WEN Zhongsheng JI Shijun sun Juncai tian Feng tian Rujin XIE Jingying Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Laboratory of Energy Science and Technology Shanghai Institude of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Laboratory of Energy Science and Technology Shanghai Institude of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

As a promising high capacity anode material for lithium ion batteries, the lithium insertion performance and possible insertion mechanism of binary alloy of NiSi2 were discussed. The initial lithium insertion of crystal NiSi2 can reach up to 600 mAh·g-1, but large irreversible capacity occurrs simultaneously for serious structure transformation and the irreversible phase forms. XRD and XPS were employed to detect the crystal structure and composition changes produced by lithium insertion. The lithium insertion-extraction behavior of NiSi2 electrode is similar to that of silicon after the first discharge. The structure stability seems related to the non-stoichimometric Ni-Si compound formed by lithium insertion into NiSi2.

关键词： anode lithium ion batteries nickel silicide high capacity

Discrimination of neutrons and gamma rays in plastic scintillator based on pulse-coupled neural network

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Nuclear Science and Techniques 2021年第8期32卷 48-56页

作者： Hao-Ran Liu Yu-Xin Cheng Zhuo Zuo tian-tian sun Kai-Min Wang The Engineering&Technical College of Chengdu University of Technology Leshan 614000China Southwestern Institute of Physics Chengdu 610225China

Neutron and gamma ray pulse signal discrimination technology is an essential part of many modern scientific fields,such as biology,geology,radiation imaging,and nuclear *** are always accompanied by gamma rays due to their unique penetration characteristic;thus,the development of n-γdiscrimination methods is especially *** the present study,a novel n-γdiscrimination method is proposed that implements a pulse-coupled neural network for n-γ*** addition,experiments were conducted on the pulse signals detected by an EJ299-33 plastic scintillator,which is especially suitable for n-γ*** proposed method was compared to three other discrimination methods,including the back-propagation neural network(BPNN),the fractal spectrum method,and the charge comparison method,with respect to two aspects:(i)the figure of merit(FoM)and(ii)discrimination *** experimental results showed that the pulse-coupled neural network(PCNN)has a 26.49%improvement in FoM-value compared to the charge comparison method,a72.80%improvement compared to the BPNN,a 66.24%improvement compared to the fractal spectrum method,and the second-fastest discrimination time of 2.22 *** conclusion,the PCNN treats the input signal as a whole for analysis and processing,imparting it with an excellent antinoise effect and the ability to process the dynamic information contained in a pulse signal.

关键词： Pulse-coupled neural network Charge comparison Back-propagation neural network Fractal spectrum n-γdiscrimination

Thermoelectric transport in holographic quantum matter under shear strain

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Communications in Theoretical Physics 2023年第1期75卷 102-119页

作者： Teng Ji Li Li Hao-tian sun CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

We study thermoelectric transport under shear strain in two spatial dimensional quantum matter using the holographic *** analytic formulae for the DC thermoelectric conductivities subjected to finite shear strain are obtained in terms of black hole horizon ***-diagonal terms in the conductivity matrix also appear at zero magnetic field,resembling an emergent electronic nematicity,which cannot nevertheless be identified with the presence of an anomalous Hall *** an explicit model study,we numerically construct a family of strained black holes and obtain the corresponding nonlinear stress-strain *** then compute all electric,thermoelectric,and thermal conductivities and discuss the effects of *** the shear elastic deformation does not affect the temperature dependence of thermoelectric and thermal conductivities quantitatively,it can strongly change the behavior of the electric *** both shear hardening and softening cases,we find a clear metal-insulator transition driven by the shear ***,the violation of the previously conjectured thermal conductivity bound is observed for large shear deformation.

关键词： black hole transport property gauge-gravity duality condensed matter shear strain

Plain carbon steel bipolar plates for PEMFC

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Rare Metals 2006年第z1期25卷 235-239页

作者： WANG Jianli sun Juncai tian Rujin XU Jing Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Basic Science Department Changchun University of Technology Changchun 130012 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China Institute of Materials and Technology Dalian Maritime University Dalian 116026 China

Bipolar plates are a multifunctional component of PEMFC. Comparing with the machined graphite and stainless steels, the plain carbon steel is a very cheap commercial metal material. In this paper, the possibility of applying the plain carbon steels in the bipolar plate for PEMFC was exploited. In order to improve the corrosion resistance of the low carbon steel in the PEMFCs′ environments, two surface modification processes was developed and then the electrochemical performances and interfacial contact resistance (ICR) of the surface modified plate of plain carbon steel were investigated. The results show that the surface modified steel plates have good corrosion resistance and relatively low contact resistance, and it may be a candidate material as bipolar plate of PEMFC.

关键词： plain carbon steel bipolar plate corrosion resistance interfacial contact resistance

旧金山果实乳杆菌生物学特性及其对发酵面食影响的研究进展

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食品工业科技 2025年第1期46卷 431-438页

作者：张国华贺霞霞路婷孙天王灿烂周世伟山西大学生命科学学院山西太原030031 乐斯福管理(上海)有限公司上海200235

旧金山果实乳杆菌(Fructilactobacillus sanfranciscensis)作为酸面团中常见的菌种,是具有良好应用价值的酸面团乳酸菌之一,该菌种通过自身的生长代谢及其与酸面团中酵母菌间的相互作用对发酵面食的风味、营养及质构等方面产生重要影响... 详细信息

旧金山果实乳杆菌(Fructilactobacillus sanfranciscensis)作为酸面团中常见的菌种,是具有良好应用价值的酸面团乳酸菌之一,该菌种通过自身的生长代谢及其与酸面团中酵母菌间的相互作用对发酵面食的风味、营养及质构等方面产生重要影响。自1971年分离该菌株以来,其分类学地位经历多次变迁,命名从Lactobacillus sanfrancisco变更为Lactobacillus sanfranciscensis,在2020年确定为Fructilactobacillus sanfranciscensis,至今,该菌种相关的研究文献已达500余篇。目前,该菌种已列入欧洲食品安全局的可食用菌种名单和韩国的限制性使用的微生物菌种名单,但尚不在我国可食用菌种名单中。本文系统综述了旧金山果实乳杆菌目前的分类学地位及其在酸面团中的普遍性,菌种的生化特性及基因特性,并阐述了其对发酵面食的影响,探索旧金山果实乳杆菌在酸面团中的应用潜力,以期开发用于酸面团的标准化发酵剂,为传统发酵面食产业化提供理论基础。

关键词：酸面团旧金山果实乳杆菌发酵面食酿酒酵母矮小哈萨克斯坦酵母菌

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Occurrence of polycyclic aromatic hydrocarbons in the estuarine sediments of the Taihu Lake and their associated toxic effects on aquatic organisms

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Pedosphere 2022年第6期32卷 833-843页

作者： tian sun Yanhua WANG Yan CHEN Mingli ZHANG Xinggong KONG School of Geography Nanjing Normal UniversityNanjing 210023(China) Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023(China) Key Laboratory of Virtual Geographic Environment Nanjing Normal UniversityMinistry of EducationNanjing 210023(China)

Polycyclic aromatic hydrocarbons(PAHs)are ubiquitous toxic organic pollutants in the natural environment that are strongly associated with socioeconomic *** the distribution,sources,and ecological toxicity of PAHs is essential to abate their pollution and biological *** 16 priority PAHs in different lakeside city estuarine sediments in the northern Taihu Lake in China were determined using gas chromatography-mass *** showed that total concentrations of PAHs(ΣPAHs)ranged from 672.07 to 5858.34 ng g^(^(-1)),with a mean value of 2121.37 ng g^(^(-1)).High-molecular-weight PAHs(4-6 rings)were dominant,accounting for 85%of theΣPAHs *** to the barrier of gate/dam in the estuarine area,the concentrations of PAHs in the sediments were significantly different between the river mouth and lake *** in total organic carbon(TOC)content and the spatial distribution of PAHs in the sediments were *** pollution assessment explored using the fuzzy evaluation model indicated 75%of slight PAH *** estuarine sediments(22%)concentrated in the east of the Wuli Lake in the Meiliang bay of the Taihu Lake were moderately or heavily *** PAHs may lead to occasional detrimental biological consequences in the *** ratios and principal component analysis-multiple linear regression suggested vehicle emission and natural gas combustion as the primary PAH contributors(81%).

关键词： contamination source ecological toxicity grade fuzzy evaluation model pollution risk assessment principal component analysis-multiple linear regression total 16 polycyclic aromatic hydrocarbons toxic organic pollutant

Synthesis of protected (2S,4R)-2-amino-4-methyldecanoic acid, a proposed component of culicinins

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Chinese Chemical Letters 2008年第9期19卷 1068-1070页

作者： Wei Zhang tian tian sun Duo Mei Jun Fei Wang Ying Xia Li Key laboratory of Marine Drugs The Ministry of Education of China School of Pharmacy Ocean University of China Qingdao 266003 China

The protected （2S,4R）-2-amino-4-methyldecanoic acid, a proposed component of culicinins has been synthesized over 10 steps and in total 28% yields using Wittig reaction and Schollkopf amino acid synthesis as key steps.

关键词： Synthesis Amino acid Schollkopf methodology Culicinins

Artifact-centric workflow management system

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计算机集成制造系统 2011年第8期17卷 1709-1721页

作者： sun Yu-tian LIU Xi KUCUKOGUZ Esra SU Jian-wen YANG Jian University of California Santa Barbara CA 93106-5110 USA Nanjing University Nanjing 210093 China Macquarie University Sydney NSW 2109 Australia

Data-centric modeling approach for workflow specification and design has received considerable attention from research and development *** architecture for a workflow management system named EZFLOWS was *** components... 详细信息

关键词： workflow artifact-centric modeling business process management