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china & World Economy 2003年第3期11卷 51-59页

作者： c.janie chang Hui-MeiTsai Jasmine Yur-Austin Professor of Accounting Department of Accounting and FinanceCollege of BusinessSan Jose State UniversityUSA.Associate Research FellowChung-Hug Institution For Economic ResearchTaipeiTaiwanChina.Associate Professor of FinanceDepartment of FinanceReal Estate and LawCollege of Business AdministrationCalifornia State UniversityUSA

Ⅰ.IntroductionDuring the past two decades,many multinationalenterprises(MNEs)have made substantial investmentsin emerging *** factors dominate thereasoning in favor of such an investment strategy:lowlabor costs and t... 详细信息

关键词： in of An Exploratory Study of Taiwanese Multinational Enterprises in the chinese Mainland The Impact of Investing in Emerging Markets on Firm Performance on

Aligned Ion conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑chang Sung Gwang‑Hee Lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo Dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and chemical Engineering center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

Hierarchical hollow microspheres assembled from carbon nanosheets integrated with molybdenum carbide nanoparticles for boosting microwave absorption properties

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Nano Research 2025年第1期18卷 10-20页

作者： Zongsheng chen Yahui Wang Yi Liu Zhigang Li Xiangyin Lv Liping Liu Yajing chang Jiaming Shi Xiao Zhang State Key Laboratory of Pulsed Power Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China Anhui Provincial Laboratory of Advanced Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Centre for Excellence in NanoscienceInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Hierarchical hollow structure has demonstrated potential for enhancing electromagnetic(EM)attenuation and improving impedance matching,garnering significant attention for ***,we have successfully implemented compositional and structural engineering to fabricate hollow Mo2c/c microspheres with controllable composition by coupling interaction between dopamine hydrochloride and ammonium *** the synergistic effect of composition and hollow structure,the strongest reflection loss intensity and broadest effective absorption of the optimized sample reach-70.2 dB and 6.2 GHz,*** formation of hollow heterogeneous structures not only favors impedance matching feature,but also generates considerable contribution to EM attenuation ***,radar cross-section simulation data indicate that hollow Mo2c/c microspheres with compositional optimization and heterogeneous structures have broad prospects for practical applications.

关键词： electromagnetic absorption Mo2c/c microwave absorption hollow structure

A comparison of Elementary Foreign Language Programs in china and the USA

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Fudan Journal of the Humanities and Social Sciences 2021年第3期14卷 319-344页

作者： Qi Si janie Hubbard Department of curriculum and Instruction The University of AlabamaBox 870232TuscaloosaAlabama 35487USA

This study presents comparisons regarding current elementary foreign language programs in china and the *** design features a comparative analysis approach combined with deductive thematic analysis to collect,analyze,and compare relevant *** were collected from samples such as governmental documents,organizational guidelines,national statistical reports,published scholarly works,audiovisual materials,and *** the research,primary categories were identified,used to group data,and then look for similarities and *** for comparison were:(a)program types,(b)curriculum standards,(c)instructional methods,and(d)*** indicated US programs could benefit from consistency,widespread support and demand,state-to-state organization and/or alignment,equitable teaching materials,and attention to all student ***'s program,while organized,could benefit from more authentic,real-life-context,other-culture-oriented practices,flexibility,and deeper,genuine information about English-speaking countries’*** research contributes to scholarly conversations regarding comparisons of elementary foreign language teaching in china and the USA,while also supporting worldwide comparisons and exchange of ideas.

关键词： Elementary education Foreign language programs Global comparison china and US education

Effects of Terephthalic Acid on Rat Lipid Metabolism

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Biomedical and Environmental Sciences 2006年第4期19卷 273-276页

作者： HEBRON c. chang Jiangsu Key Laboratory of Applied Toxicology Nanjing Medical University Nanjing 210029 Jiangsu China

Objective To study the effect of terephthalic acid （TPA） on lipid metabolism in Sprague-Dawley （SD） rats. Methods Five groups of SD rats that ingested 0%, 0.04%, 0.2%, 1%, and 5% TPA, respectively, were included in a 90-day subchronic feeding study. Effects of TPA on levels of serum protein, total cholesterol （Tc）, triglycerides （TG）, high-density lipoprotein cholesterol （HDL）, total antioxidative capability （T-AOc）, superoxide dismutase （SOD） and malondialdehyde （MDA） were observed. Urine samples were collected and analyzed for concentration of ion. Results TPA decreased the level of serum T-AOc in a dose dependent manner. The contents of serum and bladder MDA significantly decreased in 1% and 5% TPA ingestion groups. Serum cuZn superoxide dismutase （cuZnSOD） lowered in groups of 0.2%, 1%, and 5% TPA. TPA subchronic feeding had no significant influences on serum Tc, LDL or HDL, but increased serum TG, TP and ALB after administration of 0.04% and/or 0.2% TPA. concentrations of urinary ca^2＋, Mg^2＋, Na^＋, and K^＋ were elevated in 1% and 5% TPA groups. conclusion Antioxidative potential decreased after TPA exposure. MDAincrease in serum and bladder tissues was one of the most important reactions in rats which could protect themselves against TPA impairment. The decrease of serum cuZnSOD was related to the excretion of Zn^2＋.

关键词： Terephthalic acid SD rat Serum Bladder SOD MDA T-AOc Lipoprotein

Microstructural Evolution of Infrared Brazed cP-Ti Using Ti-cu-Ni Brazes

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Journal of Materials Science & Technology 2011年第2期27卷 131-138页

作者： c.T.chang T.Y.Yeh R.K.Shiue c.S.chang Department of Mechanical Engineering National Hualien Industrial Vocational Senior High SchoolHualien 970TaiwanChina Department of Materials Science and Engineering National Taiwan UniversityTaipei 106TaiwanChina Engineered Materials Solutions 39 Perry AvenueMS 4-1AttleboroMA 02703-2410USA

Microstructural evolution of infrared vacuum brazed cP-Ti using two Ti-based braze alloys,Ti-15cu-15Ni and Ti-15cu-25Ni,has been *** infrared brazed joint consisted of eutectic Ti 2 cu/Ti 2 Ni intermetallic compounds and Ti-rich *** eutectic Ti 2 cu/Ti 2 Ni intermetallic compounds disappeared from the joint after being annealed at 900 c for 1 *** contrast,the depletion rate of both cu and Ni from the braze alloy into cP-Ti substrate at 750 c annealing was greatly decreased as compared with that annealed at 900 *** Ti 2 cu/Ti 2 Ni phases were observed even if the specimen was annealed at 750 c for 15 *** the Ni content of the Ti-15cu-25Ni braze alloy is much higher than that of the Ti-15cu-15Ni alloy,the amount of eutectic Ti 2 cu/Ti 2 Ni phases in Ti-15cu-25Ni brazed joint is more than that in Ti-15ci-15Ni brazed ***,similar microstructural evolution can be obtained from the infrared brazed joint annealed at various temperatures and/or time for both filler metals.

关键词： Infrared Brazing cP-Ti Ti-cu-Ni fillers Microstructure

A correlation between pulse diagnosis of human body and health monitoring of structures

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Earthquake Engineering and Engineering Vibration 2004年第1期3卷 117-125页

作者： c.c.chang Henry T.Y.Yang Department of civil Engineering Hong Kong University of Science and TechnologyHong Kong Department of Mechanical and Environmental EngineeringUniversity of California Department of Mechanical and Environmental Engineering University of California

The concept of health monitoring is a key aspect of the field of medicine that has been practiced for a long time. A commonly used diagnostic and health monitoring practice is pulse diagnosis, which can be traced back approximately five thousand years in the recorded history of china. With advances in the development of modern technology, the concept of health monitoring of a variety of engineering structures in several applications has begun to attract widespread attention. Of particular interest in this study is the health monitoring of civil structures. It seem natural, and even beneficial, that these two health-monitoring methods, one as applies to the human body and the other to civil structures, should be analyzed and compared. In this paper, the basic concepts and theories of the two monitoring methods are first discussed. Similarities are then summarized and commented upon. It is hoped that this correlation analysis may help provide structural engineers with some insights into the intrinsic concept of using pulse diagnosis in human health monitoring, which may of be some benefit in the development of modern structural health monitoring methods.

关键词： human health monitoring pulse diagnosis structural health monitoring vibration-based techniques local detection techniques

A new localization theory of adaptive machining of near-net-shape blades

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chinese Journal of Aeronautics 2021年第6期34卷 18-32页

作者： Neng WAN Xiaogang SHEN Zhiyong chang Zezhong c.cHEN Department of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Mechanical Industrial and Aerospace EngineeringConcordia UniversityMontrealQuebec H3G IMSCanada

In the fabrication of aero-engine blades,a great deal is gained when massive material removal is avoided at the end of the process,and as little as possible material is left on the blade *** to the uncertainty of pre-process,the billet shapes are ***,the near-net-shape billet doesn’t cover the blade design surface to be ***,blade localization is necessary for these billets before the *** conventional localization methods,the design surface’s location focused on guaranteeing enough material to be ***,because the to-becut surface is in near-net and free-form shape,it is difficult to find a valid localized surface model to generate the tool *** from the localized surface is taken as rigid in previous investigation,it is allowed to deviate from the design surface no more than the tolerance *** term of this principle,the tolerance band is utilized to promote localization ability.A series of optimization models with different priorities is established to avoid the abandonment expensive blade ***,with the experiments performed on the near-net-shape blades,the blade localization theory and the promotion of localization ability are verified.

关键词： Blade localization curvature constraint Machining surface Near-net-shape blade Tolerance constraint

THE 1-LAPLAcIAN cHEEGER cUT： THEORY AND ALGORITHMS

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Journal of computational Mathematics 2015年第5期33卷 443-467页

作者： K.c. chang Sihong Shao Dong Zhang LMAM and School of Mathematical Sciences Peking University Beijing 100871 China

This paper presents a detailed review of both theory and algorithms for the cheeger cut based on the graph 1-Laplacian. In virtue of the cell structure of the feasible set, we propose a cell descend （cD） framework for achieving the cheeger cut. While plugging the relaxation to guarantee the decrease of the objective value in the feasible set, from which both the inverse power （IP） method and the steepest descent （SD） method can also be recovered, we are able to get two specified cD methods. comparisons of all these methods are conducted on several typical graphs.

关键词： Spectral graph theory Spectral clustering 1-Laplace operator Graph Lapla-cian Eigenvalue problems cheeger constant Graph cut Optimization convergence

A survey on dependability improvement techniques for pervasive computing systems

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Science china(Information Sciences) 2015年第5期58卷 19-32页

作者： YANG WenHua LIU YePang XU chang cHEUNG S.c. State Key Laboratory for Novel Software Technology Nanjing University Department of computer Science and Technology Nanjing University Department of computer Science and Engineering The Hong Kong University of Science and Technology

The goal of this survey is to summarize the state-of-the-art research results and identify research challenges of developing and deploying dependable pervasive computing systems. We discuss the factors that affect the system dependability and the studies conducted to improve it with respect to these factors. These studies were categorized according to their similarities and differences in hope of shedding some insight into future research. There are three categories: context management, fault detection, and uncertainty *** three categories of work address the three most difficult problems of pervasive computing systems. First,pervasive computing systems’ perceived environments, which are also called their contexts, can vary intensively,and thus have a great impact on the systems’ dependability. Second, it is challenging to guarantee the correctness of the systems’ internal computations integrated with interactions with external environments for *** detection is then an important issue for improving dependability for these systems. Last but not least importantly, pervasive computing systems interact with their environments frequently. These interactions can be affected by many uncertainties, which can jeopardize the systems’ dependability. After a discussion of these pieces of work, we present an outlook for its future research directions.

关键词： pervasive computing system dependability context fault detection uncertainty