检索结果-南通市图书馆

A reusable SMA actuated non-explosive lockrelease mechanism for space application

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2020年第1期11卷 65-77页

作者： Xueting pan Yuliang Zhang Yifan Lu Fei Yang Honghao yue State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbinChina Beijing Spacecraft BeijingChina

After the satellite is launched with the carrier rocket,it is necessary to separate the satellite from the rocket at an appropriate time to ensure that the satellite enters the intended *** this process,it is vital to ensure a reliable connection and accurate *** the increasing use of microsatellite in orbit,the contradiction between the shock of separation and the requirement of the platform’s dynamic environment is becoming increasingly ***,the traditional pyrotechnic separation device can no longer meet the *** paper presents a reusable non-explosive release actuator using shape memory alloy(SMA)wire for high load and low *** system is based on the Fast Acting Shock-less Separation Nut(FASSN)*** the shape memory effect of SMA,a biased SMA wire trigger has been developed,which is used as the driver source of the *** the moment of receiving the electrical signal,the SMA wire generates stress and *** trigger set free the constraints on the mechanical components,and the target is *** results indicate that the trigger device can unlock successfully and well meet the technical objectives.

关键词： SMA actuator non-explosive lock-release space application

Controlling Morphology of Active Layer by Tuning Coplanarity of the Centrality in Acceptor-Donor-Acceptor Small Molecules for Photovoltaic Application

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 Chemistry 2013年第11期31卷 1439-1448页

作者： pan Zhang Chao Li yue Zhao Yaowen Li Yingfeng Tu Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou Jiangsu 215123 China

A series of acceptor-donor-acceptor alternative small molecules were synthesized containing electron-donating central building moieties of phenothiazine, 2,7-carbazole and thieno[3,4-b]thiophene and electron-accepting moie- ties of tetrazine on both sides. The various conformations of the central blocks, with the coplanarity in an order of phenothiazine〈2,7-carbazole〈thieno[3,4-b]thiophene, have an obvious influence on the optical, electrochemical property and the crystallinity of small molecule. In addition, the blend films between small molecule and （6,6）-phenyl-C6rbutyric acid methyl ester offered significantly various morphologies, changing from uniform sur- face to interpenetrated networks. As a result, the bulk heterojunction photovoltaic devices based on the three small molecules provided varied performance, and the highest coplanar molecule based device exhibited the best photo- voltaic performance.

关键词： acceptor-donor-acceptor small molecules central blocks coplanarity morphology

Multi-Objective Equilibrium Optimizer for Feature Selection in High-Dimensional English Speech Emotion Recognition

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 2024年第2期78卷 1957-1975页

作者： Liya yue Pei Hu Shu-Chuan Chu Jeng-Shyang pan Fanli Business School Nanyang Institute of TechnologyNanyang473004China School of Computer and Software Nanyang Institute of TechnologyNanyang473004China College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao266590China Department of Information Management Chaoyang University of TechnologyTaichung413310Taiwan

Speech emotion recognition(SER)uses acoustic analysis to find features for emotion recognition and examines variations in voice that are caused by *** number of features acquired with acoustic analysis is extremely high,so we introduce a hybrid filter-wrapper feature selection algorithm based on an improved equilibrium optimizer for constructing an emotion recognition *** proposed algorithm implements multi-objective emotion recognition with the minimum number of selected features and maximum ***,we use the information gain and Fisher Score to sort the features extracted from ***,we employ a multi-objective ranking method to evaluate these features and assign different importance to *** with high rankings have a large probability of being ***,we propose a repair strategy to address the problem of duplicate solutions in multi-objective feature selection,which can improve the diversity of solutions and avoid falling into local *** random forest and K-nearest neighbor classifiers,four English speech emotion datasets are employed to test the proposed algorithm(MBEO)as well as other multi-objective emotion identification *** results illustrate that it performs well in inverted generational distance,hypervolume,Pareto solutions,and execution time,and MBEO is appropriate for high-dimensional English SER.

关键词： Speech emotion recognition filter-wrapper high-dimensional feature selection equilibrium optimizer multi-objective

Research status and performance optimization of medium-temperature thermoelectric material SnTe

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 Physics B 2022年第4期31卷 18-30页

作者： pan-pan Peng Chao Wang lan-Wei Li Shu-Yao Li Yan-Qun Chen Institute for Computational Materials Science School of Physics and ElectronicsHenan UniversityKaifeng 475004China

Thermoelectric materials have the ability to directly convert heat into electricity,which have been extensively studied for decades to solve global energy shortages and environmental *** a medium temperature(400-800 K)thermoelectric material,SnTe has attracted extensive attention as a promising substitute for PbTe due to its non-toxic *** this paper,the research status of SnTe thermoelectric materials is reviewed,and the strategies to improve its performance are summarized and discussed in terms of electrical and thermal transport *** comprehensive discussion will provides guidance and inspiration for the research on SnTe.

关键词： SnTe thermoelectric materials electronic transport thermal conductivity

Effect of Sorbents Added on Adsorption Capability of Soil for Nano-TiO_2

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第4期25卷 446-450页

作者： pan Shu-ying GAO Bao-yu yue Qin-yan School of Environmental Science and Engineering Shandong University Jinan 250100 P. R. China

The adsorption capability of loam soil for nano-TiO2 affected by the amount and intensity of leached water has been investigated by simulating the natural rainfall process under the leaching *** results show that the amount and the intensity of leached water are two important factors affecting the adsorption capability of loam soil for *** results indicate that the depth of the loam soil containing a maximal amount of nano-TiO2 is proportional to the amount of leached water,while it is inversely proportional to the intensity of leached water,at a constant amount of the leached *** was also found that the adsorption capability of soils for nano-TiO2 can be improved by adding other materials,such as dissolved organic matter（DOM）,bentonite and *** was found that DOM is the best sorbent for improving the adsorption capability of loam soil for nano-TiO2,followed by bentonite,while straw is not suitable for the modification of loam *** improvement of adsorption capability of loam soil depends on the amount of these ***-TiO2 can be effectively adsorbed on the surface layer of loam soil containing an appropriate amount of additive.

关键词： Nano-TiO2 DOM Bentonite Adsorption Eluviations

The Relation between the Magnetic Field and Spin Period of a Millisecond Pulsar

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第10期30卷 237-240页

作者： pan Yuan-yue WANG Na ZHANG Cheng-Min Xinjiang Astronomical Observatories Chinese Academy of SciencesUrumqi 830011 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

Based on the function of the accretion induced magnetic decay,the analytical relationship between the magnetic field B and spin period P of a millisecond pulsar(MSP)is investigated,from which the minimum spin period of about one millisecond can be *** this minimum spin period,the range of the neutron star(NS)radius is constrained in comparison with the measured spin period of ***,we also study the relation between the spin period and the accretion massΔM of the NS,and find that the minimum spin period is achieved with the accretion mass of about-0.2M⊙,while the bottom magnetic field of about 108 G is obtained.

关键词： second radius decay

Prognostic models for acute liver failure

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & pancreatic Diseases International 2010年第2期9卷 122-128页

作者： Du, Wei-Bo pan, Xiao-Ping Li, lan-Juan Zhejiang Univ Sch Med Affiliated Hosp 1 State Key Lab Diag & Treatment Infect Dis Hangzhou 310003 Zhejiang Peoples R China

BACKGROUND: Acute liver failure (ALF) remains a dramatic and unpredictable disease with high morbidity and mortality. Early and accurate prognostic assessment of patients with ALF is critically important for optimum clinical pathway. DATA SOURCES: Five English-language medical databases, MEDLINE, Science Direct, OVID, Springer Link and Wiley Interscience were searched for articles on 'acute liver failure', 'prognosis', and related topics. RESULTS: Multi-variable prognostic models including the King's College Hospital criteria and the model for end-stage liver disease score have been widely used in determination of the prognosis of ALF, but the results are far from satisfactory. Other prognostic indicators including serum Gc-globulin, arterial blood lactate, serum phosphate, arterial blood ammonia, and serum alpha-fetoprotein are promising but await further assessement. CONCLUSIONS: A reliable prognostic model to be developed in the future should not only have predictive value for poor outcome but also help to predict the survival of patients without a liver transplantation. Further studies are necessary to assess the prognostic accuracy of any new models. (Hepatobiliary pancreat Dis Int 2010; 9: 122-128)

关键词： acute liver failure prognosis the King's College Hospital criteria model for end-stage liver disease score liver transplantation

Synthesis and Electrochemical Studies of Carbon-modified LiNiPO4 as the Cathode Material of Li-ion Batteries

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2015年第1期31卷 117-122页

作者： ZHANG Ying pan yue LIU Jia WANG Guiling CAO Dianxue Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 P. R. China

Well-crystallized olivine LiNiPO4 and carbon-modified LiNiPO4（LiNiPO4/C） were synthesized by a combined solvothermal and solid state reaction method using water-benzyl alcohol two-phase solvent. The structure and morphology of the prepared LiNiPO4 were systematically characterized by powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The LiNiPO4 particles are up to around 2 μm in diameter while the particle size of LiNiPO4/C is about 100-200 nm. At a current rate of 0.05 C（1.00 C=167 mA/g, corresponding to one Li^＋｜ intercalation/deintercalation）, LiNiPO4 and LiNiPO4/C presented a high initial specific capacity of 157 and 220 mA.h/g, respectively. The capacity of LiNiPO4/C is 72% larger than that of LiNiPO4 at 0.1 C. The LiNiPO4/C cathode exhibits a superior electrochemical performance in comparison with LiNiPO4, revealing that carbon modifying is an effective method to improve the ionic diffusion and electronic conductivity of cathode material LiNiPO4. Furthermore, lithium ion diffusion coefficients of LiNiPO4 and LiNiPO4/C are 1.80× 10^-15 and 1.91×10^-14 cm^2/s, respectively, calculated via the data from electrochemical impedance spectra.

关键词： Lithium nickel phosphate Carbon-modifying Cathode material Lithium ion battery Lithium ion diffusion coefficient

Syntheses of bifunctional molecules containing [12]aneN_3 and carbazol moieties as effective DNA condensation agents

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 Chemistry 2014年第2期57卷 296-306页

作者： YAN Hao yue pan LI ZhiFen GUO ZhiFo LU ZhongLin Key Laboratory of Theoretical and Computational Photochemistry Ministry of Education College of Chemistry Beijing Normal University

Bifunctional molecules containing macrocyclic polyamine [12]aneN3 and carbazol units, 1-4, have been efficiently synthe sized and fully characterized. Through gel electrophoresis, atomic force microscopy, and dynamic light scattering experiments, compounds 3 and 4b bearing both [12]aneN3 and carbazol moieties showed effective DNA condensation ability at the concen- tration of 80 jaM. Investigations from EB displacement fluorescence spectra, viscosity titration, and ionic strength effects re vealed that the effective DNA condensation comes from the appropriate combination of carbazol and [12]aneN3 units in the bifunctional molecules, and the DNA condensation process is reversible. The incorporation of triazole units in the molecules clearly reduced the cytotoxicity.

关键词： DNA condensation macrocyclic polyamines carbazoles triazole gel electrophoresis AFM