检索结果-南通市图书馆

Possible Streams of the Globular Clusters in the Galaxy

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第1期7卷 111-119页

作者： Shuang Gao Bi-Wei jiang Yong-heng Zhao Department of Astronomy Beijing Normal University Beijing 100875 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

We aim to retrieve ghost streams under the assumption that all the globular clusters in our Galaxy were formed in very early merge events. Our results are based on two speculations： that the specific energy and angular momentum of the globular clusters after merge are not changed in the course of evolution and that the globular clusters with a common origin would stay in the same orbit plane as the parent galaxy. After taking into account the apogalacticum distance of the orbits, we suggest with some Confidence five possible streams. The number of streams is consistent with the previous results. Three of the four well established members of the Sagittadus stream were found to be in one of our streams. Several other globular clusters in our result were also thought to come from accretion by previous researchers. The orbital parameters of the streams are derived, which provide a way to test whether these streams are true with the help of more accurate measurement of proper motions of the globular clusters.

关键词： globular clusters general-Galaxy formation-Galaxy halo

Recent progress in single-atom nanozymes research

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 1878-1889页

作者： Bing jiang Zhanjun guo Minmin Liang Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Single-atom nanozyme(SAzyme)is the hot topic of the current nanozyme *** intrinsic properties,such as high activity,stability,and low cost,present great substitutes to natural ***,its fundamental characteristics,i.e.,maximized atom utilizations and well-defined geometric and electronic structures,lead to higher catalytic activities and specificity than traditional *** have been applied in many biomedical areas,such as anti-tumor therapy,biosensing,antibiosis,and anti-oxidation ***,we will discuss a series of representative examples of SAzymes categorized by their biomedical applications in this *** the end,we will address the future opportunities and challenges SAzymes facing in their designs and applications.

关键词： single-atom nanozymes natural enzymes enzyme-like activity biomedical applications

Bionic functional membranes for separation of oil-in-water emulsions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2024年第9期12卷 1909-1928页

作者： Chaolang CHEN Ruisong jiang Zhiguang guo School of Mechanical Engineering Sichuan UniversityChengdu 610065China School of Materials Science and Engineering Hubei UniversityWuhan 430062China

The separation of oil-in-water emulsion is an urgent challenge because its massive production and discharge from daily and industrial activities have caused severe hazards to the ecosystem and serious threats to human *** technology is considered an outstanding solution strategy for the separation of oil-in-water emulsions due to its unique advantages of low cost,high efficiency,easy operation,and environmental ***,the membrane is easily fouled by the emulsion oil droplets during the separation process,causing a sharp decline in permeation flux,which greatly inhibits the long-term use of the membrane and largely shortens the membrane’s ***,it was found that endowing the membranes with special wettability e.g.,superhydrophilic and superoleophobic can greatly enhance the permeability of the continuous water phase and inhibit the adhesion of oil droplets,thus promoting the separation performance and anti-oil-fouling property of membrane for oily *** this paper,we review and discuss the recent developments in membranes with special wettability for separating oil-in-water emulsions,including the mechanism analysis of emulsion separation membrane,membrane fouling issues,design strategies,and representative studies for enhancing the membrane’s anti-oil-fouling ability and emulsion separation performance.

关键词： bionic surface membranes wettability oil-in-water emulsions oil-water separation

Adverse Effects of Opioid Analgesics in Osteoarthritis Treatment:A Global Meta-Analysis,2000-2022

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第25期6卷 589-596,I0001-I0012页

作者： heng jiang Xing Xing He Zhu Tuo Dong School of Public Health Harbin Medical UniversityHarbin CityHeilongjiang ProvinceChina School of Public Health Peking UniversityBeijingChina

Osteoarthritis(OA)treatment commonly depends on nonsteroidal anti-inflammatory drugs and opioid ***,the clinical use of opioids is controversial due to their adverse effects and addiction *** study,drawing on 24 randomized controlled trials(RCTs)with a total of 9,586 patients,thoroughly explored the various side effects associated with opioid use in OA *** results provide additional insight into the non-addictive risks of opioids and may assist clinicians in their judicious use,potentially fostering the advancement of safer treatment *** reducing the risks of misuse and addiction,public health and safety can be enhanced.

关键词： potential thoroughly insight

Research on SFLA-Based Bidirectional Coordinated Control Strategy for EV Battery Swapping Station

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 2017年第4期53卷 343-356页

作者： guo Zhao jiang guo Hao Qiang Key Laboratory of Hydraulic Machinery Transients(Wuhan University) Ministry of EducationyWuhan 430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Urban Rail Transit Changzhou UniversityChangzhou 213164China

As a good measure to tackle the challenges from energy shortages and environmental pollution,Electric Vehicles(EVs)have entered a period of rapid *** swapping station is a very important way of energy supply to EVs,and it is urgently needed to explore a coordinated control strategy to effectively smooth the load fluctuation in order to adopt the large-scale *** bidirectional power flow between the station and power grid,this paper proposed a SFLA-based control strategy to smooth the load ***,compared simulations were performed according to the related *** to particle swarm optimization(PSO)method,the presented SFLA-based strategy can effectively lower the peak-valley difference with the faster convergence rate and higher convergence *** is important for the swapping station that energy exchanging mode can supply energy for large-scale EVs with a smoother load profile than one-way charging mode.

关键词： SFLA bidirectional coordinated control battery swapping station optimization

Research on Distributed Coordination Control Method for Microgrid System Based on Finite-time Event-triggered Consensus Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2024年第2期10卷 103-115页

作者： Lizhen Wu heng Yang Jianping Wei Wendong jiang College of Electrical and Information Engineering Lanzhou University of TechnologyLanzhou 730050China National Active Distribution Network Technology Research Center Beijing Jiaotong UniversityBeijing 100044China

Microgrids are networked control systems with multiple distributed generators(DGs).Microgrids are associated with many problems,such as communication delays,high sampling rates,and frequent controller updates,which make it challenging to realize coordination control among the ***,finite-time consensus algorithms and event-triggered control methods are combined to propose a distributed coordination control method for microgrid *** DG in the microgrid system serves as an agent node in the control network,and a distributed secondary controller is designed using finite-time consensus algorithm,such that the frequency and voltage restoration control has a faster convergence time and better anti-interference *** event-triggered function was designed based on the state information of the *** controller exchanges the state information at the trigger *** stability is analyzed using the Lyapunov stability theory,and it is verified that the controller cannot exhibit the Zeno phenomenon in the event-triggered process.A simulation platform was developed in Matlab/Simulink to verify that the proposed control method can effectively reduce the frequency of controller updates during communication delays and the burden on the communication network.

关键词： Microgrid event-triggered control distributed secondary control finite-time consensus algorithm coordination control

Amphichoterpenoids A-C,unprecedented picoline-derived meroterpenoids from the ascidian-derived fungus Amphichorda felina SYSU-MS7908

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第6期32卷 1893-1896页

作者： Minghua jiang Zhenger Wu Qilin Wu Huimin Yin heng guo Siwen Yuan Zhaoming Liu Senhua Chen Lan Liu School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510006China Southern Laboratory of Ocean Science and Engineering(Guangdong Zhuhai)Zhuhai 519000China South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center Guangzhou 510006China State Key Laboratory of Applied Microbiology Southern China Guangdong Provincial Key Laboratory of Microbial Culture Collection and ApplicationGuangdong Open Laboratory of Applied MicrobiologyGuangdong Institute of MicrobiologyGuangdong Academy of SciencesGuangzhou 510070China

Amphichoterpenoids A-C(1-3),unprecedented picoline-derived meroterpenoids possessing a pyrano[3,2-c]pyridinyl-g-pyranone scaffold,were characterized from the ascidian-derived fungus Amphichorda felina *** structures were elucidated by spectroscopic methods,X-ray diffraction and electronic circular dichroism(ECD)calculations.A plausible biosynthetic pathway was *** isolated compounds displayed moderate inhibitory activity against acetylcholinesterase with 50%inhibiting concentration(IC_(50))values of 18.8-53.2 mmol/L.

关键词： Fungal meroterpenoid Picoline Amphichorda felina Encapsulated nanodroplet crystallization Acetylcholinesterase

GRAPHICS PROCESSING UNIT CLUSTER ACCELERATED MONTE CARLO SIMULATION OF PHOTON TRANSPORT IN MULTI-LAYERED TISSUES

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2012年第2期5卷 1-9页

作者： CHAO jiang heng HE PENGCheng LI QINGMING LUO Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Biomedical Photonics of Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China

We present a graphics processing unit(GPU)cluster-based Monte Carlo simulation of photon transport in multi-layered *** cluster is composed of multiple computing nodes in a local area network where each node is a personal computer equipped with one or several GPU(s)for parallel *** this study,the MPI(Message Passing Interface),the OpenMP(Open Multi-Processing)and the CUDA(Compute Unified Device Architecture)technologies are employed to develop the *** is demonstrated that this designing runs roughly N times faster than that using single GPU when the GPUs within the cluster are of the same type,where N is the total number of the GPUs within the cluster.

关键词： Photon transport in tissues Monte Carlo simulation GPU cluster

Dynamic analysis of tethered defunct satellites with solar panels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Astrodynamics 2024年第2期8卷 297-309页

作者： Rui Qi Yang Zhang heng jiang Rui Zhong School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China School of Aerospace Astronautics Beihang UniversityBeijing 100191China

A precise dynamic model for towing and removing a defunct satellite with solar panels in orbit using a tethered net often has low computational efficiency owing to the complex contact and collision between the net and panels,which is not conducive to *** solve this problem,a“single main tether–multiple subtether”bifurcation structure with beads was employed as the tethered net *** study investigated the dynamics of tethered defunct satellites with solar panels,particularly the behavior of the attitude of the tethered satellite,oscillation of the main tether,and vibration of solar panels under different *** results showed that different attachment configurations of the subtethers and the flexibility of the main tether have an evident impact on the dynamic characteristics of the system.

关键词： space debris flexible solar panels tethered towing Kane’s method dynamics modeling