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Epidemiology,surveillance and control of methicillin-resistant Staphylococcus aureus:an Overview

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Asian Pacific Journal of Tropical Medicine 2008年第1期1卷 50-55页

作者： li f DeWolfe Miller f School of Social Work University of HawaiiHonoluluHI 96822USA John A.Burns School of Medicine University of HawaiiHonoluluH196822USA

Staphylococcus aureus(***) is one of the most common human pathogens,causing a wide range of afflictions from minor infections of the skin to serious wound infections,bacteraemia,pneumonia and endocarditis. Methicillin,the first semisynthetic derivative of penicillin,was a new hope to treat penicillin resistant *** in the early ***,only one year after its introduction,the first methicillin-resistant *** (MRSA) strains were *** is no golden rule in the control of ***,using surveillance cultures of patients and healthcare personnel,strictly enforced contact precautions,and judicious use of broad-spectrum antibiotics have helped several countries,including finland,Denmark,and the Netherlands to keep MRSA at a very low ***,countries including China,Japan,US,Italy,Greece,UK, where stringent counter-measure were not able to be installed,MRSA have become *** of MRSA in those countries were obliged to concentrate available resources to prevent MRSA infections only at patients at high risk of serious morbidity and mortality.

关键词： Staphylococcus aureus methicillin surveillance

Ab initio molecular dynamics study on the local structures in Ce_(70)Al_(30) and La_(70)Al_(30) metallic glasses

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Chinese Physics B 2018年第5期27卷 405-411页

作者： f X li J B Kong M Z li Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials ＆ Micro-nano Devices Renmin University of China Beijing 100872 China

Ab initio molecular dynamics simulations were performed to investigate the effect of similar elements on the shortto medium-range atomic packing features in Ce70Al30 and La70Al30 glass-forming alloys. 4 f electrons of Ce element in Ce70Al30 alloy were properly treated in electronic calculations. The local atomic structures in both alloys are qualitatively similar. However, the local environments of Al atoms in Ce70Al30 alloy show fluctuation with temperature in the cooling process, which could result from 4 f electrons of Ce elements. Surprisingly, the medium-range atomic packing features of Al atoms in both MGs are quite different, although Ce and La elements are similar. These findings are useful for understanding the enhanced glass-forming ability by similar element substitution in RE-based MGs from a medium-range structure perspective.

关键词： rare earth-based metallic glasses medium-range order molecular dynamics simulation

Predictive fatigue crack growth law of high-strength steels

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Journal of Materials Science & Technology 2022年第5期100卷 46-50页

作者： H.f.li P.Zhang B.Wang Z.f.Zhang Laboratory of fatigue and fracture for Materials Shi-changxu Innovation Center for Advanced MaterialsChinese Academy of SciencesInstitute of Metal ResearchShenyang 110016China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

The fatigue resistance of metallic materials is generally attributed to both strength and ***,these properties are mutually exclusive in most *** theories like Paris’law only provide some data correlation schemes rather than a predictive capability,which cannot satisfactorily guide the anti-fatigue *** this study,for the first time,the predictive fatigue crack growth rate law is proposed by considering the effects of both strength and ***,a quantitative criterion is established for judging the fatigue crack resistance of high-strength *** predictive law would provide a unique view to the quantitative anti-fatigue design of metallic materials.

关键词： fatigue crack growth Strength and toughness Paris’law High-strength steels

DYNAMIC COMPACTION Of PURE COPPER POWDER USING PULSED MAGNETIC fORCE

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 277-283页

作者： H.P. Yu C.f. li National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

The compaction of pure Cu powder was carried out through a series of experiments using dynamic magnetic pulse compaction, and the effects of process parameters, such as discharge energy and compacting direction, on the homogeneity and the compaction density of compacted specimens were presented and discussed. The results indicated that the compaction density of specimens increased with the augment of discharge voltage and time. During unidirectional compaction, there was a density gradient along the loading direction in the compacted specimen, and the minimum compaction density was localized to the center of the bottom of the specimen. The larger the aspect ratio of a powder body, the higher the compaction density of the compacted specimen. And high conductivity drivers were beneficial to the increase of the compaction density. The iterative and the double direction compaction were efficient means to manufacture the homogeneous and high-density powder parts.

关键词： magnetic pulse compaction copper powder compaction density electromagnetic forming

The Photochemical Study of HSA and BSA with Resonance light Scattering and fluorescence Spectra

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Chinese Chemical Letters 2000年第3期11卷 251-254页

作者： liang, H Shen, XC li, f Jiang, ZL Guangxi Normal Univ Inst Bioinorgan Chem Guilin 541004 Peoples R China

The resonance light-scattering (RLS) of human serum albumin (HSA) and bovine serum albumin (BSA) is reported for the first time, and applied to study photochemical reaction of HSA and BSA. The fact of photocrosslinking self-association effect in HSA and BSA solutions is identified by the enhancement of RLS. The fluorescence quenching at about 350 nm and 700 nm proves that tryptophan (Trp) residues are one of the photochemical activity sites in HSA and BSA molecules. The Rayleigh scattering (RS) spectra of HSA and BSA that were neglected in fluorescence spectra before are found at about 296 nm, 592 nm and 888 nm for the first time, and are of adventageous to studying the aggregation of HSA or BSA. The possible photochemical reaction mechanism is also proposed.

关键词： photochemical reaction photocrosslinking self-association effect resonance light-scattering serum albumin

INVESTIGATION ON HOT DUCTIliTY AND STRENGTH Of CONTINUOUS CASTING SLAB fOR AH32 STEEL

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 75-78页

作者： G. Y. li X.f. li L.G. Ao Technology Center Anshan Iron and Steel Group CorporationAnshan 114009 China

By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the different temperatures and strain rates. The Precipitations of AIN at different temperatures and the fractures of high-temperature tensile samples were observed by using TEM （transmission electron microscope） and SEM （scanning electron microscope）. The factors affecting the brittle temperature zone were discussed.

关键词： continuous casting slab brittle temperature zone tensile strength,ductility simulation

Exploring U.S.-China climate cooperation through linked carbon markets

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Advances in Climate Change Research 2023年第1期14卷 145-155页

作者： Alexander f.li Chen-fei QU Xi-liang ZHANG Schwarzman College Tsinghua UniversityBeijing 100084China Institute of Energy Environmentand EconomyTsinghua UniversityBeijing 100084China

Emissions trading systems(ETSs)are a widely used policy tool for driving emissions reductions and serve as an avenue for international climate *** the recent global agreement on carbon market standards at COP26,this study explores linked ETSs as an avenue for the *** China to cooperate on climate *** emissions,energy,and economic effects of linked ETSs are analyzed through the China-in-Global Energy Model(C-GEM),a multi-regional,computable general equilibrium *** the development of national economy-wide ETSs,two scenarios are developed linking China and the U.S.:1)a bilateral U.S.-China ETS linkage 2)a multilateral ETS linkage that includes China,the U.S.,and nations in Southeast *** indicate that emissions and energy consumption outcomes would be similar in the bilateral and multilateral ***,economic outcomes are more favorable in the multilateral linkage *** China and the *** in bilateral ETS linkage,China predominantly benefits from additional support for domestic decarbonization while the *** from increased GDP compared to without ETS *** Southeast Asia to establish multilateral linkage improves GDP outcomes for all participants,reducing adverse effects on China's GDP while boosting GDP for the *** Southeast *** policymakers considering the design and implementation of international ETSs,this study presents updated modeling on the effects of ETS linkage on each country as well as the economic benefits of expanding participation to additional regions.

关键词： U.S.-China climate cooperation Climate change Emissions trading system Carbon markets Computable general equilibrium model

Just Call Me“Three f li”

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China Today 2009年第10期58卷 18-23页

作者： li YINING liU QIONG the Market Economy Academy of Peking University Guanghua School of Management of Peking University 不详

THEY used to call me Private Enterprise li(li Minying),but I would rather be known as"Three f li"(li Sannong).It was by accident that I became an *** the very beginning of China's economic reform,I presented the concept of transforming China's economy through shareholding,and suggested that the private sector and the state-owned sector enjoy equal status in the economy.

关键词： Pro Just Call Me Three f li

Crack initiation of granite under uniaxial compression tests:A comparison study

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 656-666页

作者： G.K.Zhang H.B.li M.Y.Wang X.f.li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China University of Chinese Academy of Sciences Beijing100049China

In this study,a combination of acoustic emission(AE)method(AEM)and wave transmission method(WTM)is used to investigate the behaviors of AE and ultrasonic properties corresponding to initial fracturing in granitic *** relationships of AE characteristics,frequency spectra,and spatial locations with crack initiation(CI)are *** anisotropic ultrasonic characteristics,velocity distributions in different ray paths,wave amplitudes,and spectral characters of transmitted waves are *** identify CI stress,damage initiations characterized by strain-based method(SBM),AEM and WTM are *** granite samples,it shows that the ratio of CI stress to peak strength estimated by SBM ranges from 0.4 to 0.55,and 0.49-0.6 by WTM,which are higher than that of AEM(0.38-0.46).The CI stress identified by AEM indicates the onset of microcracking,and the combination of AEM and WTM provides an insight into the detection of rock damage initiation and anisotropy.

关键词： Crack initiation(CI)stress Acoustic emission(AE) Ultrasonic transmission Wave velocity Granite