检索结果-南通市图书馆

维普期刊数据库

Quasilocal Energy for Static Charged Black Holes in String Theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第7期36卷 125-128页

作者： wang Shi-liang jiNG ji-liang wang Yong-jiu Institute of Physics and Physics Department Hunan Normal University Changsha 410081 China Institute of Physics and Physics Department Hunan Normal University Changsha 410081 China Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 China Institute of Physics and Physics Department Hunan Normal University Changsha 410081 China

The Brown-York quasilocal energies of some static charged dilaton black holes are calculated, and then the validity of Martinez's conjecture is explored in string theory. It is shown that the energy is positive and monotonically decreases to the ADM mass at spatial infinity, and the conjecture that the Brown-York quasilocal energy at the outer horizon of black hole reduces to twice of its irreducible mass is still applicable for the static charged black holes in string theory. The result is different from Bose-Naing's one.

关键词： quasilocal energy, black hole, string theory

(2+1)-Dimensional AdS Black Hole in Grand Canonical Ensemble

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第10期36卷 413-416页

作者： CHEN Ju-Hua jiNG ji-liang wang Yongjiu Department of Physics Institute of Physics Hunan Normal University Changsha 410081 China Department of Physics Institute of Physics Hunan Normal University Changsha 410081 China Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 China Department of Physics Institute of Physics Hunan Normal University Changsha 410081 China

We investigate thermodynamics of the (2+1)-dimensional AdS black hole in grand canonical ensemble. In the York's formalism, the black hole is enclosed in a "box" with a finite radius and the boundary temperature, radius and potential are fixed in the grand canonical ensemble. We investigate the thermodynamical properties such as action,entropy, temperature, etc. We only find the stable solution for (2+1)-dimensional AdS black hole and do not find the instanton with the negative heat capacity.

关键词： action, grand canonical ensemble, (2+1)-dimensional AdS black hole

Influences of prolate spheroidal baffle of sound diffraction on spatial directivity of acoustic vector sensor

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(Technological Sciences) 2010年第10期53卷 2846-2852页

作者： ji jianFei, liang GuoLong, wang Yan & LIN wangSheng National Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China 1. National Laboratory of Underwater Acoustic Technology Harbin Engineering University Harbin 150001 China

The directivity of acoustic vector sensor (AVS) will be distorted by the sound diffraction of the AVS carrier. In this paper,the scattering of a plane acoustic wave from a prolate spheroid baffle is considered. At first,the sound diffraction of prolate spheroidal baffle is established,then the mathematical expressions of sound pressure field and particle vibration velocity field of sound diffraction are derived and the characteristic of the directivity of pressure and velocity of sound diffraction field at different frequencies and distances is analyzed. The directivity of AVS is determined by the amplitude and phase difference of diffraction wave and incident wave,which possesses a close relationship with frequency and incident angle. Finally,the calculated results are compared with the experimental results.

关键词： prolate spheroidal baffle sound diffraction field spatial directivity vector sensor

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第15期10卷 5082-5087页

作者： Su-Fei Pan Yuan-Yuan Zhang Xiao-Zhen wang jing-jing Sun Shao-Ling Song Yu-Rong Tang ji-liang wang Department of Laboratory Medicine Shengli Oilfield Central HospitalDongying 257034Shandong ProvinceChina

BACKGROUND Mycobacterium abscessus(***)is a rapidly growing mycobacterium and ubiquitous in the environment,which infrequently causes disease in ***,it can cause cutaneous or respiratory infections among immunocompromised *** to the resistance to most antibiotics,the pathogen is formidable and *** SUMMARY Here,we present a case of catheter-related *** infections in a patient with motor neurone *** and peripheral blood cultures of the patient showed positive results during Gram staining and acid-fast *** alarm time of catheter blood culture was 10.6 h earlier than that of peripheral *** removal of the peripherally inserted central catheter,secretion and catheter blood culture were *** was identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry and 16S rDNA *** For catheter-related *** infection,rapid diagnosis and timely and adequate antimicrobial therapy are crucial.

关键词： Catheter-related infections Diagnosis Motor neurone disease Mycobacterium abscessus Case report

Development of a magnetite-gene complex for gene transfection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Medicine 2010年第2期4卷 241-246页

作者： jian XIN Yan LUO Ze-Feng XIA Kai-Xiong TAO Kai-Lin CAI Gao-Xiong HAN Xiao-Ming SHUAI ji-liang wang Han-Song DU Guo-Bin wang Department of Laparoscopic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Ophthalmology Wuhan No.1 HospitalWuhan 430022China

The key to successful gene therapy is toﬁnd a suitable method and carrier for transfection to allow a gene to be transferred into a cell and integrated into the target *** aim of this study was to determine whether biomagnetic material could be combined with the nucleic acid for gene ***-coated iron oxide nanoparticles(DCIONPs)were prepared and mixed with the plasmid pGenesil-1 containing the test gene,which expresses enhanced greenﬂuorescent protein(eGFP).PGenesil-1 empty vector was used as a *** binding ability was assessed by electrophoresis of the DNA on agarose gels and quantiﬁcation using BANDS-CAN *** different gene carriers,Lipofecta-mine 2000,Sofast,and DCIONPs,the large intestine cancer(Lovo)cell line was transfected in vitro with or without a magneticﬁ*** expression of eGFP was observed byﬂuorescence microscopy,and the transfection efﬁciency was *** results showed there was a rapid increase in combining rate when the quality ratio of DCIONPs and pGenesil-1 ascended from 1∶1 to 5∶***,the combining rate increased less rapidly as the quality ratio continued *** expression of eGFP showed that the early transfection rate could be improved by applying a magneticﬁ*** conclusion,the DCIONPs we synthesized are able to carry plasmid DNA and enhance the early transfection efﬁciency when using a magneticﬁeld.

关键词： nanoparticle magnetite gene therapy mag-netofection

IoT Empowered Early Warning of Transmission Line Galloping Based on Integrated Optical Fiber Sensing and Weather Forecast Time Series Data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 1171-1192页

作者： Zhe Li Yun liang jinyu wang Yang Gao State Grid Henan Electric Power Company Electric Power Scientific Research Institute State Grid Henan Electric Power CompanyZhengzhou450052China

Iced transmission line galloping poses a significant threat to the safety and reliability of power systems,leading directly to line tripping,disconnections,and power *** early warning methods of iced transmission line galloping suffer from issues such as reliance on a single data source,neglect of irregular time series,and lack of attention-based closed-loop feedback,resulting in high rates of missed and false *** address these challenges,we propose an Internet of Things(IoT)empowered early warning method of transmission line galloping that integrates time series data from optical fiber sensing and weather ***,the method applies a primary adaptive weighted fusion to the IoT empowered optical fiber real-time sensing data and weather forecast data,followed by a secondary fusion based on a Back Propagation(BP)neural network,and uses the K-medoids algorithm for clustering the fused ***,an adaptive irregular time series perception adjustment module is introduced into the traditional Gated Recurrent Unit(GRU)network,and closed-loop feedback based on attentionmechanism is employed to update network parameters through gradient feedback of the loss function,enabling closed-loop training and time series data prediction of the GRU network ***,considering various types of prediction data and the duration of icing,an iced transmission line galloping risk coefficient is established,and warnings are categorized based on this ***,using an IoT-driven realistic dataset of iced transmission line galloping,the effectiveness of the proposed method is validated through multi-dimensional simulation scenarios.

关键词： Optical fiber sensing multi-source data fusion early warning of galloping time series data IoT adaptive weighted learning irregular time series perception closed-loop attention mechanism

A coordinated planning strategy of energy storage allocation and line upgrading to increase photovoltaic consumption with lowest planning cost

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 Technological Sciences 2025年

作者： Bo ZHANG Yuqi ji Lu ZHANG Wei TANG Xiaohui ZHANG liang wang Haoran DING Hanchen MAO College of Information and Electrical Engineering China Agricultural University State Grid Heilongjiang Electric Power Research Institute State Grid Heilongjiang Electric Power Company Limited School of Electrical and Information Engineering Zhengzhou University of Light Industry

Random integration of massive distributed photovoltaic (PV) generation poses serious challenges to distribution networks. Voltage violations, line overloads, increased peak–valley differences, and power-flow reversals can occur at different locations, times, and severities. Traditional planning methods such as energy storage (ES) allocation and upgrading of lines may result in poor economics and low equipment utilization. This study proposes a distribution-network planning strategy that coordinates three planning mechanisms:ES allocation to substations and to feeders, and line upgrading. The proposed strategy achieved the lowest annual cost, considering the distribution network problems at different locations, times, and severities. A net load curve description method was first proposed considering economic planning and the uncertain distribution of loads and PVs. Second, a multistage optimization model for ES allocation and line upgrading was established based on the net load curves. Finally, an improved IEEE33 node system was used in the case study. The planning results show that the proposed coordinated planning strategy can address the problems caused by the random integration of massive distributed PVs, improve equipment utilization, and obtain the lowest total annual planning cost.

关键词：

Preparation and Performance of Ternary Early Strength Agent and Quercetin Composite Cement Sealing Material

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 130-140页

作者： LIU jian CHEN Meiting ji Xiaoli XU Chao wang Chunmei Department of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry Anhui University of Science and TechnologyHuainan 232001China Department of Chemical Engineering and Explosives Anhui University of Science and TechnologyHuainan 232001China

A ternary early-strengthening agent consisting of calcium formate+triethanolamine+lithium sulfate was compounded with quercetin to shorten the setting time of cementitious materials while ensuring their early *** optimum ratio of the three early-strengthening agents was determined as 0.5%calcium formate+0.04%triethanolamine+0.4%lithium sulfate by response surface *** effects of the ternary early-strengthening agent composed of calcium formate+triethanolamine(TEA)+lithium sulfate on cementitious pore sealing materials under the synergistic effect of quercetin were studied by means of the performance tests of compressive strength,fluidity,and setting time,and the microstructural characterizations of X-ray powder diffractometer(XRD),thermogravimetry(TG-DSC)and scanning electron microscopy(SEM).The study shows that the synergistic effect of ternary early-strengthening agent and quercetin forms a multi-performance composite admixture for cementitious *** best performance was obtained with the compounding scheme of 0.5%calcium formate+0.04%triethanolamine+0.4%lithium sulfate ternary early-strengthening agent and 0.05%*** compressive strength of 1,3,7,and 28 d are 94.8%,39.8%,42%,and 28%higher than those of the blank group,*** initial time and final setting time are 41 and 57 minutes,*** to the microscopic analysis,the network and fibrous C-S-H gels generated by ternary early-strengthening agents are attached to the surface promoted by quercetin,which forms skeleton support while thickening and solidifying the cement slurry,which enhances the early compressive strength of the cement-based materials.

关键词： sealing material ternary early-strengthening agent quercetin synergetic effect response surface methodology

Flexible Graphene Field‑Effect Transistors and Their Application in Flexible Biomedical Sensing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 252-313页

作者： Mingyuan Sun Shuai wang Yanbo liang Chao wang Yunhong Zhang Hong Liu Yu Zhang Lin Han Institute of Marine Science and Technology Shandong UniversityQingdao 266237ShandongPeople’s Republic of China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China School of Integrated Circuits Shandong UniversityJinan 250100ShandongPeople’s Republic of China Shandong Engineering Research Center of Biomarker and Artificial Intelligence Application Jinan250100ShandongPeople’s Republic of China

Flexible electronics are transforming our lives by making daily activities more *** to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and ***,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and *** combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical ***,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning *** ability of FGFETs to sense strains and biomolecular charges opens up diverse application *** specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical ***,we discuss the current challenges and prospects of FGFETs and their applications in biomedical *** review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.

关键词： Flexible Graphene Field-effect transistor Wearable Implantable Biosensor

维普期刊数据库