检索结果-南通市图书馆

Variant selection, coarsening behavior of α phase and associated tensile properties in an α+β titanium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第4期99卷 101-113页

作者： Lei Lei Qinyang Zhao cong wu Yongqing Zhao Shixing Huang Weiju Jia Weidong Zeng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Material Science and Engineering Chang’an UniversityXi’an 710064China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

Effect of cooling rates,i.e.,air cooling and furnace cooling,after solution in α+β phase-field on variant selection,coarsening behavior of α phase and microstructure evolution were investigated in α+β TC21 *** textures of primary α(α_(p))and lamellar α(α_(L))in β phase transformation microstructure(β_(t))were analysed separately,and the orientation relationship among α_(p),α_(L) and the parent β phase were *** addition,the influence of the microstructure characteristics on the tensile properties was *** results showed that all parent β grains,despite their different orientations,produced 12 ideal α_(L) variants with the same texture components and interweave to form a basketweave β_(t) structure under the air-cooling *** α_(p) without Burgers orientation relationship(BOR)with β phase exhibited obviously texture component without overlapping theαL texture *** volume fraction of α_(p) in the furnace-cooled sample(about 50%)was higher than that of the air-cooled sample(about 12%),while the size of it slightly increased with decreasing the cooling *** each β grain,the thick α_(L) in the same orientation formed anαcolony.A typical 3 variant colonies which were related to each other were ***,the α_(L) spatial orientation distribution showed more ***,the BOR between α_(p) and β and the same orientation of some α_(L) and the surrounding α_(p) grains resulting in the overlapping of α_(p) texture component and α_(L) texture *** last,the relationship between microstructure and tensile properties was analysed.

关键词： TC21 alloy Crystallographic orientation Texture Variant selection Tensile properties

Unconventional Bose–Einstein Condensations from Spin-Orbit Coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第9期28卷 217-220页

作者： wu cong-Jun Ian Mondragon-Shem ZHOU Xiang-Fa Department of Physics University of CaliforniaSan DiegoCA 92093 Instituto de Física Universidad de AntioquiaAA 1226MedellínColombia Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026

According to the"no-node"theorem,the many-body ground state wavefunctions of conventional Bose–Einstein condensations(BEC)are positive-definite,thus time-reversal symmetry cannot be spontaneously *** find that multi-component bosons with spin-orbit coupling provide an unconventional type of BECs beyond this *** focus on a subtle case of isotropic Rashba spin-orbit coupling and the spin-independent *** the limit of the weak confining potential,the condensate wavefunctions are frustrated at the Hartree–Fock level due to the degeneracy of the Rashba *** zero-point energy selects the spin-spiral type condensate through the"order-from-disorder"*** a strong harmonic confining trap,the condensate spontaneously generates a half-quantum vortex combined with the skyrmion type of spin *** both cases,time-reversal symmetry is spontaneously *** phenomena can be realized in both cold atom systems with artificial spin-orbit couplings generated from atom-laser interactions and exciton condensates in semi-conductor systems.

关键词： interaction mechanism Einstein

Light carbon isotope events of foraminifera attributed to methane release from gas hydrates on the continental slope, northeastern South China Sea

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第10期59卷 1981-1995页

作者： ZHUANG Chang CHEN Fang CHENG SiHai LU HongFeng wu cong CAO Jun DUAN Xiao Key Laboratory of Marine Mineral Resources Ministry of Land and ResourceGuangzhou Marine Geological Survey

In 2013, the China Geological Survey and Guangzhou Marine Geological Survey conducted the second Chinese gas hydrate expedition in the northern South China Sea （SCS） and successfully obtained visible gas hydrate samples. Five of the thirteen drilling sites were cored for further research. In this work, Site GMGS2-08 is selected for the stable isotopic analy- sis of foraminifera present in the boreholes in order to reveal the carbon isotopic characteristics of the foraminifera and their response to methane release in the gas hydrate geological system. Our results show that the methane content at Site GMGS2-08 is extremely high, with headspace methane concentrations up to 39300 μmol L^-1. The hydrocarbon δ^13C values, ranging from -69.4%o to -72.3‰ PDB, distinctly indicate biogenic generation. Based on the δD analytical results （-183‰ to -185‰ SMOW）, headspace methane is further discriminated to be microbial gas, derived from CO2 reduction. By isotopic measurement, five light δ^13C events are found in the boreholes from Site GMGS2-08, with foraminiferal δ^13C values being ap- parently lower than the normal variation range found in the glacial-interglacial cycles of the SCS. The δ^13C values of benthic Uvigerina peregrina are extremely depleted （as low as -15.85‰ PDB）, while those of planktonic Globigerinoides ruber reach -5.68‰ PDB. Scanning electron micrograph （SEM） studies show that foraminiferal tests have experienced post-depositional alteration, infilled with authigenic carbonate, and the diagenetic mineralization is unlikely to be related to the burial depths. The correlation calculation suggests that the anaerobic oxidation of organic matter has only weak influences on the δ^13C com- position of benthic foraminifera. This means that the anomalous δ^13C depletions are predominantly attributed to the overprint- ing of secondary carbonates derived from the anaerobic oxidation of methane （AOM）. Furthermore, the negative δ^13C anoma- lies, coupled with the positive

关键词： Gas hydrates Carbon isotopes Foraminifera South China Sea Taixinan Basin

A Review on Electric Vehicle Charging Infrastructure Development in the UK

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 193-205页

作者： Tianjin Chen Xiao-Ping Zhang Jianji Wang Jianing Li cong wu Mingzhu Hu Huiping Bian XU JI Power Co. Ltd.XuchangChina Department of Electronic Electrical and Systems EngineeringUniversity of BirminghamBirminghamUK State Grid Shandong Electric Power Company LinyiChina

This paper focuses on the development of electric vehicle(EV)charging infrastructure in the UK,which is a vital part of the delivering ultra-low-emission vehicle(ULEV)and will transition into low emission energy systems in the near *** a brief introduction to global landscape of EV and its infrastructure,this paper presents the EV development in the *** then unveils the government policy in recent years,charging equipment protocols or standards,and existing EV charging *** topologies of charging infrastructure are ***,three important factors to be considered in a typical site,i.e.,design,location and cost,are discussed in ***,the management and operation of charging infrastructure including different types of business models are *** but not least,challenges and future trends are discussed.

关键词： Electric vehicle(EV) charging point charging infrastructure smart charging

Acute liver failure with thrombotic microangiopathy due to sodium valproate toxicity:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第17期9卷 4310-4317页

作者： Xuan Mei Hai-cong wu Mei Ruan Li-Rong Cai Department of Hepatobiliary Internal Medicine The 900th Hospital of PLA Joint Logistics Support ForceFuzhou 350025Fujian ProvinceChina Department of Hepatobiliary Internal Medicine The third affiliated people's hospital of FuJian University of traditional Chinese medicineFuzhou 350100Fujian ProvinceChina

BACKGROUND Sodium valproate is widely used in the treatment of epilepsy in clinical *** adverse reactions to sodium valproate are mild and reversible,while serious idiosyncratic side effects are becoming apparent,particularly ***,we report a case of fatal acute liver failure(ALF)with thrombotic microangiopathy(TMA)caused by treatment with sodium valproate in a patient following surgery for *** SUMMARY A 42-year-old man who received antiepileptic treatment with sodium valproate after surgery for meningioma exhibited extreme fatigue,severe jaundice accompanied by oliguria,soy sauce-colored urine,and *** postoperative laboratory values indicated a rapid decreased platelet count and hemoglobin level,severe liver and kidney dysfunction,and disturbance of the coagulation *** was diagnosed with drug-induced liver failure combined with *** plasma exchange combined with hemoperfusion,pulse therapy with high-dose methylprednisolone,and blood transfusion,his liver function deteriorated,and finally,he *** ALF with TMA is a rare and fatal adverse reaction of sodium valproate which needs to be highly valued.

关键词： Sodium valproate Drug-induced liver injury Thrombotic microangiopathy Plasma exchange Organ transplantation Case report

Design and calculation of a side-coupled accelerating structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第11期28卷 204-209页

作者： Ming-Xuan Liu cong-Feng wu Yun-Gai Tang Gui-Rong Huang National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

In this paper, we present the design and optimization of a side-coupled accelerating structure with an energy switch. The beam parameters are optimized, and the electric field asymmetry in the first cell is analyzed. The new structure we designed has an improvement of 10 times in the accelerating field symmetry. Thermo-mechanical analysis is performed based on the electromagnetic results. The highest temperature is 72.5 ℃ at the nose cone, and the maximal deformation is 73 μm at the outer edge of the coupling cavity.

关键词： Side-coupled accelerating structure Energy switch Beam dynamics Asymmetry Thermomechanical analysis

Benzobisthiazole Polymer with Resonance-assisted Hydrogen Bonds for High-performance Transistor and Solar Cell Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第2期40卷 147-156页

作者： Bing-Yong Liu cong Xie cong-wu Ge Meng-Meng Cui Wei Yang Zai-Fei Ma Xi-Ke Gao Yin-Hua Zhou Qing Zhang Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical EngineeringShanghai Jiaotong UniversityShanghai 200240China wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsDonghua UniversityShanghai 201620China

Benzobisthiazole polymer with resonance-assisted hydrogen bonds(RAHBs)has been synthesized for both organic field-effect transistor and polymer solar cell *** properties of the hydrogen bonded polymer are compared with the reference polymer without ***-crystal X-ray diffraction analyses of the building block reveal that the RAHB interactions are formed between the carbamate hydrogen and imine nitrogen of the *** hydrogen donor and acceptor are connected byπ-conjugated molecular framework and the hydrogen-bridged quasi aromatic rings lock the conformation of the building *** building block adopted a layered sandwich packing in crystal instead of slipped herringbone stacking which was often found in the crystal of benzobisthiazole *** polymer PCBTZ-TT with RAHBs showed deeper HOMO/LUMO energy level(about 0.2 eV)than reference *** PCBTZ-TT demonstrated the hole mobility of0.96 cm^(2)·V^(-1)·s^(-1) in field-effect transistor devices and achieved power conversion efficiency of 13.6%in solar cell devices with Y6 as acceptor without any additive.

关键词： Resonance-assisted hydrogen bonding Benzobisthiazole Thiazole OFET OPV

Brain Cognition Mechanism-Inspired Hierarchical Navigation Method for Mobile Robots

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第2期21卷 852-865页

作者： Qiang Zou Chengdong wu Ming cong Dong Liu Faculty of Robot Science and Engineering Northeastern UniversityShenyang110819China School of Mechanical Engineering Dalian University of TechnologyDalian116024China

Autonomous navigation is a fundamental problem in *** methods generally build point cloud map or dense feature map in perceptual space;due to lack of cognition and memory formation mechanism,traditional methods exist poor robustness and low cognitive *** a new navigation technology that draws inspiration from mammal’s navigation,bionic navigation method can map perceptual information into cognitive space,and have strong autonomy and environment *** improve the robot’s autonomous navigation ability,this paper proposes a cognitive map-based hierarchical navigation ***,the mammals’navigation-related grid cells and head direction cells are modeled to provide the robots with location *** then a global path planning strategy based on cognitive map is proposed,which can anticipate one preferred global path to the target with high efficiency and short ***,a hierarchical motion controlling method is proposed,with which the target navigation can be divided into several sub-target navigation,and the mobile robot can reach to these sub-targets with high confidence ***,some experiments are implemented,the results show that the proposed path planning method can avoid passing through obstacles and obtain one preferred global path to the target with high efficiency,and the time cost does not increase extremely with the increase of experience nodes *** motion controlling results show that the mobile robot can arrive at the target successfully only depending on its self-motion information,which is an effective attempt and reflects strong bionic properties.

关键词： Bionic navigation Spatial localization cells Global path planning Hierarchical motion controlling

Toughening effects of Mo and Nb addition on impact toughness and crack resistance of titanium alloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第20期79卷 147-164页

作者： Shixing Huang Qinyang Zhao Yongqing Zhao Cheng Lin cong wu Weiju Jia Chengliang Mao Vincent Ji School of Materials Science and Engineering Northeastern UniversityShenyangLiaoning110819China School of Material Science and Engineering Chang’an UniversityXi’anShaanxi710064China Northwest Institute for Nonferrous Metal Research Xi’anShaanxi710016China School of Mechanical Engineering Liaoning Shihua UniversityFushunLiaoning113001China ICMMO/SP2M UMR CNRS 8182UniversitéParis-SaclayOrsay91405France

Ti-6Al,Ti-6Al-2Mo and Ti-6Al-3Nb alloys were prepared to investigate the toughening effects ofβstabilizers Mo and Nb on impact toughness and crack resistance of titanium *** Charpy impact tests showed that the total impact absorbed energy of Ti-6Al-2Mo and Ti-6Al-3Nb(∼64 J)were two times higher than that of Ti-6Al(∼30 J),indicating the higher impact toughness of Ti-6Al-2Mo and Ti-6Al-3Nb *** of load-displacement curves revealed the similar crack initiation energy of Ti-6Al,Ti-6Al-2Mo and Ti-6Al-3Nb(15.4 J,16.1 J and 15.0 J,respectively).However,the higher crack propagation energy of Ti-6Al-2Mo and Ti-6Al-3Nb(46.7 J and 48.3 J,respectively)were about three times higher than that of Ti-6Al(14.4 J),indicating the stronger resistance to crack propagation in Ti-6Al-2Mo and ***-mortem analysis of impact samples demonstrated that the increased dislocation density and deformation twinning were mainly responsible for the stronger resistance to crack propagation in Ti-6Al-2Mo and *** to the invisibility of dislocation activation and deformation twinning during the Charpy impact process,a mathematical model has been proposed to evaluate the effects of Al,Mo and Nb elements on dislocation mobility based on the Yu Rui-huang electron *** of Mo and Nb elements significantly improved the dislocation mobility in Ti-6Al-2Mo and Ti-6Al-3Nb compared to that in Ti-6Al ***,more dislocations were activated in Ti-6Al-2Mo and Ti-6Al-3Nb which supplied the larger plastic deformation under impact loading.A dislocation-based model also has been proposed to interpret the nucleation and propagation of deformation twinning under the impact *** pileup atα/βinterfaces provided potential sites for nucleation of deformation twinning in Ti-6Al-2Mo and ***,deformation twinning facilitated the dislocation motion inαgrains with hard *** increased dislocation mobility and deformation

关键词： Titanium alloy Impact toughness Crack resistance Dislocation mobility Deformation twinning