检索结果-南通市图书馆

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第3期11卷 191-201页

作者： li-hua LUO Hong liU Ping li hui wang State Key Laboratory of Industrial Control Technology Zhejiang UniversityHangzhou 310027China

For automated vehicles,comfortable driving will improve passengers’ *** fuel consumption brings economic profits for car owners,decreases the impact on the environment and increases energy *** addition to comfort and fuel-economy,automated vehicles also have the basic requirements of safety and *** this purpose,an adaptive cruise control (ACC) algorithm with multi-objectives is proposed based on a model predictive control (MPC) *** the proposed ACC algorithm,safety is guaranteed by constraining the inter-distance within a safe range; the requirements of comfort and car-following are considered to be the performance criteria and some optimal reference trajectories are introduced to increase *** performances of the proposed ACC algorithm are simulated and analyzed in five representative traffic scenarios and multiple *** results show that not only are safety and car-following objectives satisfied,but also driving comfort and fuel-economy are improved significantly.

关键词： Adaptive cruise control (ACC) Multi-objectives Comfort Fuel-economy Model predictive control (MPC)

Measurement of cathode surface temperature using the method of CCD imaging in arc discharge

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2006年第4期17卷 237-240页

作者： li hui wang Chuan-Bing Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China

A two-wavelength pyrometry device using ordinary array CCD (charge coupled device) to collect the ra- diation data in the horizontal and vertical directions has been developed for measuring the cathode surface temperature during the arc discharge. Analyses of experimental results show that the device can make the measurement of the cathode surface temperature feasible. The cathode surface temperatures measured are lower than the melting point of tungsten (3653 K), and the arc current, cathode diameter, and the cathode length are the main influencing factors of the cathode surface temperature.

关键词：阴极表面温度电弧放电电荷耦合器件双波长测高温技术

Congruence Triples on Regular Semigroups and Their Generalizations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第8期27卷 1611-1620页

作者： li Min wang hui Yuan YANG School of Mathematics South China Normal University Guangzhou 510631 P. R. China

In this paper, we introduce the concept of VT-congruence triples on a regular semigroup S and show how such triples can be constructed by nsing the equivalences on S/L, S/R and the special congruences on S. Also, such congruence triples are characterized so that an associated congruence can be uniquely determined by a given congruence triple. Moreover, we also consider the VH-congruence pairs on an orthocryptogroup.

关键词： Regular semigroup orthodox semigroup orthocryptogroup congruence normal equivalence

Dissociation of liquid water on defective rutile TiO2 （110） surfaces using ab initio molecular dynamics simulations

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 physics 2018年第3期13卷 53-59页

作者： hui-li wang Zhen-Peng Hu hui li School of Physics Nankai University Tianjin 300071 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China Institute of Physics Chinese Academy of Sciences Beijing 100190 China

In order to obtain a comprehensive understanding of both thermodynamics and kinetics of water dissociation on TiO2, the reactions between liquid water and perfect and defective rutile TiO2 （110） surfaces were investigated using ab initio molecular dynamics simulations. The results showed that the free-energy barrier （-4.4 kcal/mol） is too high for a spontaneous dissociation of water on the perfect rutile （110） surface at a low temperature. The most stable oxygen vacancy （VOl） on the rutile （110） surface cannot promote the dissociation of water, while other unstable oxygen vacancies can significantly enhance the water dissociation rate. This is opposite to the general understanding that Vol defects are active sites for water dissociation. Furthermore, we reveal that water dissociation is an exothermic reaction, which demonstrates that the dissociated state of the adsorbed water is thermodynamically favorable for both perfect and defective futile （110） surfaces. The dissociation adsorption of water can also increase the hydrophilicity of TiO2.

关键词： ab initio molecular dynamics rutile (110) free energy barrier spontaneous reaction exothermic reaction

Experimental Evaluation on Grinding Texture on Flank Face in Chamfer Milling of Stainless Steel

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 Mechanical Engineering 2018年第4期31卷 117-123页

作者： Xian-li liu Jin-Kui Shi Wei Ji li-hui wang Harbin University of Science and Technology KTH Royal Institute of Technology

The surface quality of chamfer milling of stainless steel is closed related to the products of 3 C(Computer, Communication and Consumer electronics), where a cutter is a major part to achieve that. Targeting a high-quality cutter,an experimental evaluation is carried out on the influence of grinding texture of cutter flank face on surface *** mathematic models of chamfer cutter are established, and they are validated by a numerical simulation. Also the grinding data are generated by the models and tested by a grinding simulation for safety reasons. Then, a set of chamfer cutting tools are machined in a five-axis CNC grinding machine, and consist of five angles between the cutting edge and the grinding texture on the 1 st flank faces, i.e., 0°, 15°, 30°, 45° and 60°. Furthermore, the machined cutting tools are tested in a series of milling experiments of chamfer hole of stainless steel, where cutting forces and surface morphologies are measured and observed. The results show that the best state of both surface quality and cutting force is archived by the tool with 45° grinding texture, which can provide a support for manufacturing of cutting tool used in chamfer milling.

关键词： Grinding texture Chamfer cutter Cutting force Surface quality

Changes in sea surface temperature in western South China Sea over the past 450 ka

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第18期54卷 3335-3343页

作者： li li wang hui li JianRu ZHAO MeiXun wang PinXian State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China

Sea surface temperature over the past 450 ka was obtained by the unsaturation of molecular fossil-long chain alkenone with a resolution of about 1 ka from the western South China Sea. This is the longest temperature profile in the South China Sea at such high resolution. The U3k7′-SST results revealed similar glacial-interglacial cycles as the δ18O profile of planktonic foraminifera, with SST variability of 23―25.5℃ for glacial and 25―28℃ for interglacial periods. The highest SST (28.4℃) was recorded at MIS5.5 and lowest SST (22.6℃) during MIS2. The SST record preceded the planktonic foraminiferal δ18O on five glacial-interglacial transitions. Comparison of temperature records from the Southern and Northern Hemispheres indicated a more Southern Hemisphere-like pattern for the temperature variation in the SCS. Strong precession and semiprecession signals in the spectra of our SST record manifest the tropical phenomena.

关键词：华南西部海表温度中国浮游有孔虫海温变化海上间冰期表面温度

An ERP Study of the Object Preference in Processing Chinese Relative Clauses

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2017年第1期15卷 5-19页

作者： hui-li wang Wei Yue Qiang li Jian-Rong li School of Foreign Langugaes Dalian University of TechnologyDalian 116024China Doka Formwork Shanghai 201109China

Through an event-related potential（ERP）study, we examined the processing mechanisms of four types of Chinese（Mandarin） relative clauses（RCs）,namely subject subject-extracted relative clause（SSR）,subject object-extracted relative clause（SOR）, object subject-extracted relative clause（OSR）, and object object-extracted relative clause（OOR） to test the universality and language specificity of RC comprehension processes. The results of this study support a preference for object-extracted RCs modifying both the subject and object of a sentence, i.e.,SORs and OORs. In particular, ERP results showed stronger P600 effects in the RC region for SSRs compared with SORs, which we argue reflects a canonical word order theory. Stronger N400 effects were observed for verbs compared with nouns, reflecting easier understanding for nouns. ERP results from the matrix clause object and the relativizer “de” showed stronger P600 effects in SSRs compared with SORs,suggesting thematic structure effects on syntactic construction and the processing preference of the whole sentence.

关键词： sentence clause comprehension syntactic preference SSRs argue likely hypothesis Preference

Electrodeposition and characterization of thermoelectric Bi_2Se_3 thin films

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 104-107页

作者： Xiao-long li Ke-feng Cai hui li ling wang Chi-wei Zhou Functional Materials Research Laboratory Tongji University Shanghai 200092 China

Bi2Se3 thin films were electrochemically deposited on Ti and indium tin oxide-coated glass substrates, respectively, at room temperature, using Bi（NO3）3·5H2O and SeO2 as starting materials in diluted HNO3 solution. A conventional three-electrode cell was used with a platinum sheet as a counter electrode, and a saturated calomel electrode was used as a reference electrode. The films were annealed in argon atmosphere. The influence of cold isostatic pressing before annealing on the microstructure and thermoelectric properties of the films was investigated. X-ray diffraction analysis indicates that the film grown on the indium tin oxide-coated glass substrate is pure rhombohedral Bi2Se3, and the film grown on the Ti substrate consists of both rhombohedral and orthorhombic Bi2Se3.

关键词： thermoelectric thin films bismuth selenide electrodeposition thermoelectric properties cold isostafic pressing

Traditional Chinese Medicine Erhuang Suppository for Treatment of Persistent High-risk Human Papillomavirus Infection and Its Impact on Transcriptome of Uterine Cervix

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2024年第4期44卷 841-853页

作者： Zi-zhuo wang hui-li wang Wei XIONG Juan DU Rong liU Department of Obstetrics and Gynecology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China Department of Pharmacology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Objective High-risk human papillomavirus(HR-HPV)infection is the chief cause of cervical intraepithelial neoplasia(CIN)and cervical *** Erhuang suppository(EHS)is a traditional Chinese medicine(TCM)prepared from realgar(As_(2)S_(2)),Coptidis rhizoma,alumen,and borneolum syntheticum and has been used for antiviral and antitumor ***,whether EHS can efficiently alleviate HR-HPV infection remains *** study was conducted to evaluate the efficacy of EHS for the treatment of persistent HR-HPV infection in the uterine *** In this study,we evaluated the therapeutic efficacy of EHS in a randomized controlled clinical trial with a 3-month ***,70 patients with persistent HR-HPV infection were randomly assigned to receive intravaginal administration of EHS or *** DNA,ThinPrep cytologic test(TCT),colposcopy,and safety evaluation were carried out after *** analysis was performed to compare transcriptome profiles before and after EHS treatment.A K14-HPV16 mouse model was generated to confirm the efficiency of *** After 3 months,74.3%(26/35)of the patients in the treatment group were HPV negative,compared to 6.9%(2/29)in the placebo ***-throughput microarrays revealed distinct transcriptome profiles after *** differentially expressed genes were significantly enriched in complement activation,immune response,and apoptotic *** K14-HPV16 mouse model also validated the remarkable efficacy of *** This study demonstrated that EHS is effective against HR-HPV infection and cervical ***,no obvious systemic toxicity was observed in patients during the *** superior efficacy and safety of EHS demonstrated its considerable value as a potential cost-effective drug for the treatment of HPV infection and HPV-related cervical diseases.

关键词： Traditional Chinese Medicine Erhuang suppository human papillomavirus cervical diseases transcriptomics

Understanding the stability and reactivity of ultrathin tellurium nanowires in solution： An emerging platform for chemical transformation and material design

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 Research 2015年第4期8卷 1081-1097页

作者： liang Xu Hai-Wei liang hui-hui li Kai wang Yuan Yang Lu-Ting Song Xu wang Shu-Hong Yu Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at Microscale Collaborative InnovationCenter of Suzhou Nano Science and Technology Department of Chemistry University of Science and Technology of China Hefei230026 China

The stability and reactivity of nanomaterials are of crucial importance for their application, but the long-term effects of stability and reactivity of nanomaterials under practical conditions are still not well understood. In this study, we first established a comprehensive strategy to investigate the stability of a highly reactive nanomaterial from the viewpoint of reaction kinetics with ultrathin tellurium nanowires （TeNWs） as a model material in aqueous solution through an accelerated oxidation process. This allowed us to propose a new approach for the design and synthesis of other unique one-dimensional nanostructures by a chemical transformation process using the intermediate nanostructures ＂captured＂ during the dynamic oxidation process under different conditions. In essence, the oxidation of ultrathin TeNWs is a gas-solid reaction which involves liquid, gas and solid phases. It has been demonstrated that the oxidation process of ultrathin TeNWs in aqueous solution can be divided into three stages, namely oxygen limiting, ultrathin TeNWs limiting and mass transfer resistance limiting stages. The apparent oxidation kinetics for ultrathin TeNWs is approximately in accord with a first order reaction kinetics model and has an apparent activation energy as low as TeNWs are thermodynamically unstable 13.53 ***^-1, indicating that ultrathin However, the unstable nature of ultrathin TeNWs is actually an advantage since it can act as an excellent platform to help us synthesize and design one-dimensional functional nanomaterials--with special structures and distinctive properties--which are difficult to obtain by a direct synthesis method.

关键词： stability reactivity oxidation reaction kinetics chemical transformation storage ultrathin nanowires