检索结果-南通市图书馆

维普期刊数据库博看期刊

Recent progress in self-propelled particles

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第1期36卷 61-77页

作者： zhen-yu Ouyang Jian-zhong Lin Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo315201China Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou310027China

Self-propelled particles are commonly found in a large number of planktonic organisms such as bacteria,fungi,and algae in nature,and researchers have taken a long interest in exploring their swimming mechanisms for more than a *** in the past 20 years,with the development of computational fluid dynamics and flow display technology,as well as the need for the design of synthetic self-propelled particles and micro-swimming devices,self-propelled particles have become the forefront and hotspot of current research in the field of fluid *** paper first introduces the swimming characteristics of common self-propelled particles,leading to a classic“squirmer”type self-propelled particle *** this basis,a systematic introduction and summary of the theoretical and numerical simulation research of“squirmer”will be ***,the main challenges and opportunities faced by the current research will be summarized.

关键词： Self-propelled particles multiphase flow hydrodynamic interaction

Overview of SSRF phase-Ⅱ beamlines

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 2024年第8期35卷 48-57页

作者： Ren‑zhong Tai zhen‑Tang Zhao Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

The SSRF phase-Ⅱ beamline project was launched in 2016. Its major goal was to establish a systematic state-of-the-art experimental facility for third-generation synchrotron radiation to solve problems in cutting-edge science and ***, the construction is fully completed. All 16 newly built beamlines with nearly 60 experimental methods passed acceptance testing by the Chinese Academy of Sciences and are in operation.

关键词： SSRF phase-Ⅱbeamline project Accelerator upgrade User laboratory User data center Beamline technique support

Retrospect and Prospect of Higher Education in Chinese Medicine in Hong Kong,China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2017年第7期23卷 494-495页

作者： ZHAO zhong-zhen School of Chinese Medicine Hong Kong Baptist UniversityHong Kong SAR China

It has been 16 years since the first courses on Chinese medicine （CM） at Hong Kong Baptist University （HKBU） were *** can be said that the advancement o f CM education is a microcosm of the development of the CM in Hong Kong *** a past course director,I was closely involved with colleagues and students in this unforgettable *** Years of Difficulty Have Laid the Foundation for A Bright Future

关键词： Baptist courses director Bright created advancement curriculum pharmacy Australia earned

Effect of SiO_2 addition on the microstructure and electrical properties of ZnO-based varistors

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 86-91页

作者： zhen-hong Wu Jian-hui Fang Dong xu Qin-dong zhong Li-yi Shi Research Center of Nano Science and Technology Shanghai University Shanghai 200444 China School of Science Shanghai University Shanghai 200444 China School of Material Science and Engineering Shanghai University Shanghai 200072 China

The microstructure and electrical properties of ZnO-based varistors with the SiO2 content in the range of 0-1.00mol% were prepared by a solid reaction route. The varistors were characterized by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry, inductively coupled plasma-atomic emission spectrometry, and X-ray photoelectron spectroscopy. The results indicate that the average grain size of ZnO decreases with the SiO2 content increasing. A new second phase （Zn2SiO4） and a glass phase （Bi2SiO5） are found. Element Si mainly exists in the grain boundary and plays an important role in controlling the Bi2O3 vaporization. The electric measurement shows that the incorporation of SiO2 can significantly improve the nonlinear properties of ZnO-based varistors, and the nonlinear coefficients of the varistors with SiO2 are in the range of 36.8-69.5. The varistor voltage reaches the maximum value of 463 V/mm and the leakage current reaches the minimum value of 0.11 μA at the SiO2 content of 0.75mol%.

关键词： inorganic materials varistor silicon dioxide electrical properties

Engineering morphologies of cobalt oxide/phosphate-carbon nanohybrids for high-efficiency electrochemical water oxidation and reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第1期30卷 139-146,I0005页

作者： Shan-Shan xu Xian-Wei Lv Yan-Mei Zhao Tie-zhen Ren zhong-Yong Yuan Hebei Provincial Key Laboratory of Green Chemical Technology&High Efficient Energy Saving School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin 300350China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021NingxiaChina

Active non-noble metal catalysts plays a decisive role for water electrolysis,however,the rational design and development of cost-efficient electrocatalysts with Pt/IrO2-like activity is still a challenging ***,a facile one-step electrodeposition route in deep eutectic solvents(DESs) is developed for morphology-controllable synthesis of cobalt oxide/phosphate-carbon nano hybrids on nickel foam(CoPO@C/NF).A series of CoPO@C/NF nanostructures including cubes,octahedrons,microspheres and nanoflowers are synthesized,which show promising electrocatalytic properties toward oxygen and hydrogen evolution reactions(OER/HER).Such surface self-organized microstructure with accessible active sites make a significant contribution to the enhanced electrochemical activity,and hybridizing cobalt oxide with cobalt pyrophosphates and carbon can result in enhanced OER performance through synergistic *** all nanostructures,the obtained microspherical CoPO@C/NF-3 catalyst exhibits excellent catalytic activities for OER and HER in 1.0 M KOH,affording an anodic current density of 10 mA cm^(-2) at overpotentials of 293 mV for OER and 93 mV for HER,with good long-time *** work offers a practical route for engineering the high-performance electrocatalysts towards efficient energy conversion and storage devices.

关键词： Cobalt-based electrocatalysts Oxygen evolution reaction Hydrogen evolution reaction Deep eutectic solvents Electrodeposition

Fair multigroup multicast precoding design based on traffic demands for multibeam satellite systems

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第10期36卷 366-374页

作者： Zhiqi DAI zhen xu School of Electronic and Information Engineering Beihang UniversityBeijing 100191China

Onboard resources are limited for multibeam satellite communication systems,while differences exist in traffic demands among *** conventional multigroup multicast precoding methods do not take traffic demands for users into consideration,it is difficult to flexibly adjust the offered throughput to users’*** with higher demand may obtain lower throughput while users with lower demand may be over-satisfied,which results in the requested-offered throughput mismatch and resource *** paper proposes a fair multigroup multicast precoding design based on traffic *** obtain the precoding design,the optimization problem aimed at maximizing the minimum throughput satisfaction ratio,which is defined as the ratio of the offered throughput to the traffic demand,is formulated,so as to provide fair service for all users while satisfying per-feed power constraints and traffic demand *** address this problem,an auxiliary variable is first introduced to equivalently simplify ***,the semidefinite relaxation and the bisection search strategies are adopted to further handle the ***,the optimal precoding vectors are obtained by employing eigenvalue decomposition or Gaussian *** results indicate the effectiveness of the proposed precoding algorithm and demonstrate that it can better adapt to the scenarios with different traffic demands.

关键词： Satellite communication systems Multigroup multicast precoding Traffic demand Throughput satisfaction ratio Fairness optimization

Design Research of a Novel Aftercool-Humidifier Concept for Humid Air Turbine Cycle

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第3期33卷 951-969页

作者： ZHANG Junzheng xu zhen School of Energy and Power Engineering Shandong UniversityJi’nan250061China Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment Shandong UniversityJi’nan250061China

Humid air turbine cycle(HAT)has potential of electrical efficiencies comparable to combined cycle,with lower investment cost and NO_(x) *** typical heat exchanger network of HAT consists of intercooler(if there is),aftercooler,recuperator,economizer and humidifier,which brings higher efficiency but makes the system more *** simplify HAT layout,a novel humidifier concept is proposed by integrating the aftercooler into traditional counter-current *** on this concept,a one-dimensional model including pressure drop and exergy calculation is established to distinguish the thermodynamic and hydrodynamic characteristics,and then the structural parameters,such as the number of rows and columns,tube diameter,pitch and type for a micro HAT are *** results show that the aftercool-humidifier plays the same role as original aftercooler and humidifier,and can match the in-tube air,out-tube air and water stream well with lower *** the case of micro HAT cycle,the volume of heat and mass transfer area can be reduced by 47%compared with traditional *** major thermal resistance occurred in the convection heat transfer process inside the tube;however,using enhanced tube cannot effectively improve the compactness of device.

关键词： humid air turbine cycle humidifier thermodynamic analysis one-dimensional model

A THEORETICAL MODEL FOR THERMAL-SENSITIVE MICROGEL WITH PNIPAM CORE AND ELASTIC SHELL

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2012年第5期25卷 520-529页

作者： zhen Wu zheng zhong School of Aerospace Engineering and Applied Mechanics Tongji Universityshanghai 200092China

Poly （N-isopropylacrylamide）（PNIPAM） microgels are widely used in drug delivery due to their fast response to temperature. In order to get a better biocompatibility, PNIPAM mi- crogels are typically coated with a layer of biocompatible material, resulting in composite microgels with core-shell structure. In a composite microgel prepared recently, for example, a microsphere of PNIPAM gel is enclosed by a phospholipid membrane, and the composite microgel exhibits a substantial volume transition in response to temperature changes. Here we develop a theoretical model to describe the thermal-responsive behavior of this composite microgel. In particular, we treat the phospholipid membrane as an elastic layer behaving like rubber-like elastomers and adopt the form of the free-energy function for nematic gels （which refer to anther species of thermal- sensitive gels whose behavior has been intensively studied） as that for PNIPAM gels. We show that the thermal-responsive behavior of the composite microgel can be markedly influenced by the membrane. By investigating the state of stress on the interface, we further predict that when the coating membrane is stiff and thin, wrinkles are expected to occur on the outer surface of the composite microgel after the volume transition.

关键词： gel poly (N-isopropylacrylamide) volume transition core-shell structure

Framework for Contrastive Learning Phases of Matter Based on Visual Representations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2023年第2期40卷 50-54页

作者： Xiao-Qi Han Sheng-Song xu zhen Feng Rong-Qiang He zhong-Yi Lu Department of Physics Renmin University of ChinaBeijing 100872China

A main task in condensed-matter physics is to recognize,classify,and characterize phases of matter and the corresponding phase transitions,for which machine learning provides a new class of research tools due to the remarkable development in computing power and *** much exploration in this new field,usually different methods and techniques are needed for different ***,we present SimCLP:a simple framework for contrastive learning phases of matter,which is inspired by the recent development in contrastive learning of visual *** demonstrate the success of this framework on several representative systems,including non-interacting and quantum many-body,conventional and *** is flexible and free of usual burdens such as manual feature engineering and prior *** only prerequisite is to prepare enough state ***,it can generate representation vectors and labels and hence help tackle other *** therefore paves an alternative way to the development of a generic tool for identifying unexplored phase transitions.

关键词： Visual hence classify