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Network Reliability Analysis of Digital Instrument and Control System with GO-FLOW Methodology

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Transactions of Tianjin university 2012年第1期18卷 73-78页

作者： FANG Tao LU Daogang WAKABAYASHI Toshio School of Nuclear science and engineering North China Electric Power UniversityBeijing 102206China department of quantum science and energy engineering Tohoku UniversitySendai 980-8579Japan

In this paper,the network reliability of an actual digital instrument and control system (DICS) network is analyzed by using GO-FLOW methodology (GFM).The evaluations of common-cause failure (CCF) and uncertainty are *** significant CCF groups (real time servers,gateways,reactor protection system) and three typical time intervals (10 min,1 h,and 24 h) are selected in the *** is concluded that the network contribution of CCF accounts for over 68% of the system failure *** result indicates that GFM is suitable for the network reliability analysis.

关键词： GO-FLOW methodology common-cause failure network digital instrument and control system

Luminescence regulation of Sb^(3+)in 0D hybrid metal halides by hydrogen bond network for optical anti-counterfeiting

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Opto-Electronic Advances 2024年第3期7卷 15-25页

作者： Dehai Liang Saif M.H.Qaid Xin Yang Shuangyi Zhao Binbin Luo Wensi Cai Qingkai Qian Zhigang Zang Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China department of Physics&Astronomy College of SciencesKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia department of Chemistry and Chemical engineering Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong ProvinceShantou UniversityShantou 515063China department of Oil Army Logistics Academy of PLAChongqing 401311China

The Sb^(3+) doping strategy has been proven to be an effective way to regulate the band gap and improve the photophysical properties of organic-inorganic hybrid metal halides(OIHMHs).However,the emission of Sb^(3+) ions in OIHMHs is primarily confined to the low energy region,resulting in yellow or red *** date,there are few reports about green emission of Sb^(3+)-doped ***,we present a novel approach for regulating the luminescence of Sb^(3+) ions in 0D C_(10)H_(2)_(2)N_(6)InCl_(7)·H_(2)O via hydrogen bond network,in which water molecules act as agents for hydrogen ***^(3+)-doped C_(10)H_(2)2N_(6)InCl_(7)·H_(2)O shows a broadband green emission peaking at 540 nm and a high photoluminescence quantum yield(PLQY)of 80%.It is found that the intense green emission stems from the radiative recombination of the self-trapped excitons(STEs).Upon removal of water molecules with heat,C_(10)H_(2)_(2)N_(6)In_(1-x)Sb_(x)Cl_(7) generates yellow emis-sion,attributed to the breaking of the hydrogen bond network and large structural distortions of excited *** water molecules are adsorbed by C_(10)H_(2)_(2)N_(6)In_(1-x)Sb_(x)Cl_(7),it can subsequently emit green *** water-induced reversible emission switching is successfully used for optical security and information *** findings expand the under-standing of how the local coordination structure influences the photophysical mechanism in Sb^(3+)-doped metal halides and provide a novel method to control the STEs emission.

关键词： indium-based halides Sb^(3+)doping hydrogen bonding network optical anti-counterfeiting

Enhanced visible-light photocatalytic hydrogen evolution using two-dimensional carbon nitride sheets with the removal of amine groups

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Chinese Chemical Letters 2024年第2期35卷 446-450页

作者： Yu Zhang Liting Wu Shaopeng Wang Dingyi Yang Huan Liang Yizhang Wu Jian Hao Youqing Wang Jianke Liu Yong Wang department of Physics Shaanxi University of Science and TechnologyXi'an 710021China School of Advanced Materials and Nanotechnology Academy of Advanced Interdisciplinary ResearchXidian UniversityXi'an 710126China The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi'an 710126China Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing 210093China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical engineering Ningxia UniversityYinchuan 750021China

Two-dimensional(2D)carbon nitride sheets(CNs)with atomically thin structures are regarded as one of the most promising materials for solar energy ***,due to their substantially enlarged bandgap caused by the strong quantum size effect and their incomplete polymerisation with a large number of non-condensed surface amino groups,the practical applicability of CNs in photocatalysis is *** this study,CNs with broad visible-light absorption were synthesised using a 5-min fast thermal *** removal of uncondensed amine groups reduces the bandgap of CNs from 3.06 eV to 2.60 eV,increasing their absorption of visible ***,the CNs were distorted after annealing,which can differentiate the spatial positions of electrons and holes,enhancing the visible-light absorption *** a result,when exposed to visible light,the photocatalytic hydrogen production activity of atomically thin 2D CNs rose by 8.38 *** research presents a dependable and speedy method for creating highly effective visible-light photocatalysts with narrowed bandgaps and improved visible-light absorption.

关键词： 2D carbon nitride sheets Rapid thermal annealing DFT calculations Visible-light absorption visible-light photocatalysis

Monolayer transition metal disulfide: Synthesis, characterization and applications

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Progress in Natural science:Materials International 2016年第3期26卷 221-231页

作者： Qi Fu Bin Xiang department of Materials science & engineering CAS Key Lab of Materials for Energy Conversion and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Two-dimensional transition metal dichalcogenides（2D TMDCs） has aroused tremendous attention in recent years, because of their remarkable properties originated from their unique structure. In this review we report th... 详细信息

关键词： Transition metal disulfide Layered-structure Field effect transistor Photoresponse

Structure,stability,and motion of dislocations in double-wall carbon nanotubes

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Chinese Physics B 2012年第10期21卷 327-334页

作者：张凯旺李中秋吴建彭向阳谭新君孙立忠钟建新 Laboratory for quantum engineering and Micro-Nano energy Technology and department of Physics Xiangtan University

In this paper,a novel double-wall carbon nanotube（DWCNT） with both edge and screw dislocations is studied by using the molecular dynamics（MD） *** differences between two adjacent tubule indexes of armchair and zigzag nanotubes are determined to be 5 and 9,respectively,by taking into account the symmetry,integrality,and thermal stability of the composite *** is found that melting first occurs near the dislocations,and the melting temperatures of the dislocated armchair and zigzag DWCNTs are around 2600 K-2700 *** the premelting temperatures,the shrink of the dislocation loop,which is comprised of edge and screw dislocations,implies that the composite dislocation in DWCNTs has self-healing *** dislocated DWCNTs first fracture at the edge dislocations,which induces the entire break in axial tensile *** dislocated DWCNTs have a smaller fracture strength compared to the perfect *** results not only match with the dislocation glide of carbon nanotubes（CNTs） in experiments,but also can free from the electron beam radiation under experimental conditions observed by the high resolution transmission electron microscope（HRTEM）,which is deemed to cause the motion of dislocation loop.

关键词： dislocation carbon nanotube molecular dynamics thermal stability

Plasma-mirror frequency-resolved optical gating for simultaneous retrieval of a chirped vacuum-ultraviolet waveform and time-dependent reflectivity

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High Power Laser science and engineering 2016年第2期4卷 80-84页

作者： Ryuji Itakura Takayuki Kumada Motoyoshi Nakano Hiroshi Akagi Kansai Photon science Institute National Institutes for Quantum and Radiological Science and Technology(QST) Nuclear science and Research Institute Japan Atomic Energy Agency department of Chemistry Graduate School of ScienceTohoku University

We demonstrate that the methodology of frequency-resolved optical gating(FROG) is applicable to time-resolved reflection spectroscopy of a plasma mirror in the vacuum-ultraviolet(VUV) region. Our recent study [R. Itakura et al. Opt. Express 23, 10914(2015)] has shown that a VUV waveform can be retrieved from a VUV reflection spectrogram of a plasma mirror formed on a fused silica(FS) surface by irradiation with an intense femtosecond laser pulse. Simultaneously, the increase in the reflectivity with respect to the Fresnel reflection of the unexcited FS surface can be obtained as a time-dependent reflectivity of the plasma mirror. In this study, we update the FROG analysis procedure using the least-square generalized projections algorithm. This procedure can reach convergence much faster than the previous one and has no aliasing problem. It is demonstrated that a significantly chirped VUV pulse as long as 1 ps can be precisely characterized.

关键词： frequency-resolved optical gating least-square generalized projections algorithm plasma mirror vacuum ultraviolet

Theoretical investigation of gold based model catalysts

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science China Chemistry 2015年第4期58卷 565-573页

作者： Wenhua Zhang Weixin Huang Jinlong Yang Key Lab of Materials for energy Conversion department of Materials science and engineering University of Science and Technology of China Synergetic Innovation Center of quantum Information & quantum Physics university of science and Technology of China Hefei National Lab for Physical sciences at the Microscale

With potential applications in various fields, gold related catalysts have received intensive attentions. In the past decade, mechanisms of gold catalysis for low-temperature CO oxidation, NOx oxidation/reduction, selective oxidation of alcohols have been investigated both experimentally and theoretically based on model catalysts using free or supported gold nanoparticles and single crystal gold surfaces. In this short review, we summarize recent theoretical studies on molecular oxygen activation process, water or hydroxyl involved oxidation reaction, and also the effect of local structure on the reactivity and selectivity.

关键词： gold catalysis CO oxidation mechanism NO reduction alcohol selective oxidation local structure effect

2D hetero-structures based on transition metal dichalcogenides:fabrication,properties and applications

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science Bulletin 2017年第16期62卷 1148-1161页

作者： Ping Liu Bin Xiang department of Materials science&engineering CAS Key Lab of Materials for Energy Conversionand Synergetic Innovation Center of Quantum Information&Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Recently,two dimensional transition metal dichalcogenides MX_2(M = Mo,W,etc; X = S,Se,Te) have ignited immense interests because of their unique structural and physical properties for the potential applications in the nano-optoelectronics,valley-spintronics etc. In terms of the structural compatibility and van der Waals interaction,two dimensional(2D) MX_2 layers can be fabricated into various lateral and vertical hetero-structures. The atomically-thin hetero-structures comprising different layered MX_2 provide a new platform for exploring fundamental physics and device technologies with unprecedented phenomenon and extraordinary functionalities. In this review,we report the recent progress about the fabrication,properties and applications of 2D hetero-structures based on transition metal dichalcogenides.

关键词： Transition metal dichalcogenides Hetero-structures Chemical vapor deposition Charge transfer Optoelectronic devices

Higher-order topology induced by structural buckling

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National science Review 2022年第8期9卷 55-61页

作者： Huaqing Huang Feng Liu School of Physics Peking University Collaborative Innovation Center of quantum Matter Center for High energy Physics Peking University department of Materials science and engineering University of Utah

Higher-order topological insulator(HOTI) states, such as two-dimension(2D) HOTI featured with topologically protected corner modes at the intersection of two gapped crystalline boundaries, have attracted much recent interest. However, the physical mechanism underlying the formation of HOTI states is not fully understood, which has hindered our fundamental understanding and discovery of HOTI materials. Here we propose a mechanistic approach to induce higher-order topological phases via structural buckling of 2D topological crystalline insulators(TCIs). While in-plane mirror symmetry is broken by structural buckling, which destroys the TCI state, the combination of mirror and rotation symmetry is preserved in the buckled system, which gives rise to the HOTI state. We demonstrate that this approach is generally applicable to various 2D lattices with different symmetries and buckling patterns, opening a horizon of possible materials to realize 2D HOTIs. The HOTIs so generated are also shown to be robust against buckling height fluctuation and in-plane displacement. A concrete example is given for the buckledβ-Sb monolayer from first-principles calculations. Our finding not only enriches our fundamental understanding of higher-order topology, but also opens a new route to discovering HOTI materials.

关键词： higher-order topological insulators structural buckling rotation-reflection symmetry buckled honeycomb antimony monolayer