检索结果-南通市图书馆

中华医学杂志(英文版) 2024年第14期137卷 1750-1752页

作者： Xie Xinsheng zhang w.i Fu w.iguo zhang w.yne w. w.ng Lixin Department of Vascular Surgery Xiamen Branch Zhongshan Hospital Fudan University Xiamen Fujian China Department of Vascular Surgery Zhongshan Hospital Fudan University Shanghai China Department of Plastic surgery Plastic Surgery Hospital Peking Union Medical College Beijing China Department of Division of Vascular and Endovascular Surgery Seattle VA Medical Center University of Washington Seattle WA USA

To the Editor: Thoracic endovascular aortic repair (TEVAR) has been w.dely accepted as the first-line treatment w.en aortic repair is indicated. How.ver, TEVAR is still limited by anatomic conditions in many circumstances, and the most common exclusion situations are inadequate proximal and/or distal landing zones w.en important branch vessels are involved. The incidence of insufficient distal landing zone in descending TEVAR ranges from 2.5% to 15.2%, and different approaches to extend it w.re described. Hybrid surgery w.th combined TEVAR and open revascularization of visceral vessels has been employed from the early stage of endovascular aortic repair but it is associated w.th poor outcomes. Endovascular visceral artery revascularization, such as branched and fenestrated endograft, has been used more recently. Outcomes of stenting visceral arteries during fenestrated/branched aortic repair w.re explored by several studies and promising results w.re exhibited. How.ver, these techniques demand heavily on available device and technical skills. Currently, there is no Food and Drug Administration (FDA)-approved branched TEVAR endograft for visceral artery preservation. Chimney or snorkel procedures are relatively easier to perform, but it is associated w.th a higher incidence of endoleaks.

关键词： ANEURYSM TRUNK TEVAR

Thermodynamic Foundation for High Temperature Electrochemistry

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第4期20卷 494-500页

作者： zhang w. E. A. Charles J. Congleton Corrosion Research Group School of Chemical Engineering & Advanced Materials University of Newcastle upon TyneCorrosion Research Group School of Chemical Engineering & Advanced Materials University of Newcastle upon TyneCorrosion Research Group School of Chemical Engineering & Advanced Materials University of Newcastle upon Tyne NE1 7RU UK NE1 7RU UKNE1 7RU UK

Thermodynamic concepts required for the thermodynamic calculation of the potentials of electrodes for high temperature applications are briefly review.d. A thermodynamic approach to the calculation of half cell potentials and the standard chemical potential of an electron at high temperatures w.ich are related to the Standard Hydrogen Electrode(SHE) is discussed. As examples, an external Ag/AgCl reference electrode and a YSZ(Ag|O_2) pH sensor for high temperature applications are analyzed by using the thermodynamic approach to derive a high temperature pH measurement equation. The tw. electrodes are employed to measure high temperature pH and the measured pH w.s compared w.th the calculated pH by using a solution chemistry method. Concepts and principles for electrode kinetics are also briefly introduced and a modification to the Tafel equations is suggested.

关键词： High temperature potential Half cell potential External Ag/AgCl reference electrode Standard chemical potential of an electron High temperature pH sensor.

Modified Multi-Resolution Telescopic Search Algorithm for Block-Matching Motion Estimation

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2001年第3期12卷 90-96页

作者： zhang, w. Zhou, R. Kondo, T. Institute of Microelectronics Tsinghua University Beijing 100084 China

This paper presents a modified multi-resolution telescopic search algorithm (MRTlcSA) for the block-matching motion estimation. A novel inverse telescopic search is substituted for the conventional telescopic search, that reduces the on-chip memory size and memory bandw.dth for VLSI implementation. In addition, strategies of motion track and adaptive search w.ndow.are applied to reduce the computational complexity of motion estimation. Simulation results show.that, compared w.th the MRTleSA, the proposed algorithm reduces the computational load to only 30% w.ile preserving almost the same image quality. Comparisons on hardw.re cost and pow.r consumption of the VLSI implementations using the tw. algorithms are also presented in the paper.

关键词： Algorithms Bandw.dth Computational complexity Computer simulation Image quality Microprocessor chips Optical resolving pow.r Optical telescopes Pattern matching VLSI circuits

An Improvement on the Efficiency of a Single Rotor Transonic Compressor by Reducing the Shock w.ve Strength on the Blade Suction Surfaces

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第2期21卷 127-135页

作者： S. J. Geng N. X. Chen H. w. zhang w. G. Huang Institute of Engineering Thermophysics Chinese Academy of Sciences EO. Box 2706 Beijing 100190 China

It is w.ll know. that increasing the rotational velocity is an effective w.y to increase the total pressure ratio. w.th increasing flow.velocity especially under the condition of transonic flow.in the supersonic region, w.ere exist strong shock w.ves, the shock w.ve loss becomes main and important. Simultaneously, there occurs boundary layer separation due to the shock w.ve / boundary layer interaction. In the present paper the transonic compressor blades w.re studied and analyzed to find a proper and simple w.y to reduce the shock w.ve loss by optimizing the suction surface configuration or controlling the gradient of isentropic Mach number on the suction surface. A Navier-Stokes solver combined w.th a modified design algorithm w.s developed and used. The NASA single rotor for transonic flow.compressor w.s served as a numerical example to show.the effectiveness of this method. Tw. cases for both original and modified rotors w.re analyzed and compared.

关键词： Transonic compressor shock w.ve loss efficiency improvement blade optimization

TiZr-base Bulk Metallic Glass w.th over 50 mm in Diameter

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第6期26卷 481-486页

作者： M. Q. Tang H.F. zhang Z. w. Zhu H.M. Fu A.M. w.ng H. Li Z.Q. Hu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72Wenhua Road Shenyang 110016 China

Low.cost TiZr-base bulk metallic glasses （BMGs）（Ti36.1Zr33.2Ni5.8Be24.9）100-xCux （x=5, 7 and g） w.th a maximum size of over 50 mm in diameter w.re developed by optimizing the alloy composition. The idea is initiated by selecting a particular microstructure comprising primary β-Ti dendrite and amorphous phase. Afterw.rds, based on this composition of amorphous phase, a class of TiZr-base bulk metallic glasses w.s designed step by step to reach the optimum composition range. The glass transition temperature （Tg）, initial crystallization temperature （Tx） and w.dth of supercooled region （AT） of （***33.2Nis.8Be24.9）91Cu9 BMG are 611, 055 and 44 K, respectively. The （Ti36.1Zr33.2Ni5.8Be24.9）91Cu9 BMG exhibits low.density of 5.541 g·cm-3 and high compressive fracture strength of 1800 MPa, w.ich promises the potential application as structural materials.

关键词： TiZr-base alloy Bulk metallic glass (BMG) Fracture strength

Population Aging And Its Strategic Options

在线全文

学校读者我要写书评

暂无评论

China Population Today 1997年第6期14卷 2-2页

作者： zhang w.

Population aging,as one of the major characteristics of population development in the 21st *** the attenticn of the *** United N ations reminded of its member *** the 35 th Conference of Social Devel opment Conmittee onvened *** population aging w.s a major challenge to any society in the coming century,and emphasized the importance for every country to giving priority to this issue.

关键词： Strategic Aging

A Preliminary Comparative Study on the Centering Algorithms for CassiniISS NAC Images

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第10期24卷 58-65页

作者： T.Liang Q.-F.zhang G.-M.Liu w.-H.Zhu C.-S.w.ng Department of Computer Science Jinan UniversityGuangzhou 510632China Sino-French Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China School of Computer Science Guangdong University of EducationGuangzhou 510303China

Obtaining high precision is an important consideration for astrometric studies using images from the Narrow.Angle Camera(NAC)of the Cassini Imaging Science Subsystem(ISS).Selecting the best centering algorithm is key to enhancing astrometric *** this study,w. compared the accuracy of five centering algorithms:Gaussian fitting,the modified moments method,and three point-spread function(PSF)fitting methods(effective PSF(ePSF),PSFEx,and extended PSF(x PSF)from the Cassini Imaging Central Laboratory for Operations(CICLOPS)).w. assessed these algorithms using 70 ISS NAC star field images taken w.th CL1 and CL2 filters across different stellar *** ePSF method consistently demonstrated the highest accuracy,achieving precision below.0.03 pixels for stars of magnitude *** to the previously considered best,the modified moments method,the e PSF method improved overall accuracy by about 10%and 21%in the sample and line directions,***,the xPSF model provided by CICLOPS had low.r precision than the ***,the ePSF exhibits an improvement in measurement precision of 23%and 17%in the sample and line directions,respectively,over the *** discrepancy might be attributed to the xPSF focusing on photometry rather than *** findings highlight the necessity of constructing PSF models specifically tailored for astrometric purposes in NAC images and provide guidance for enhancing astrometric measurements using these ISS NAC images.

关键词： methods:analytical techniques:image processing stars:imaging astrometry

Sb^(3+)and Sm^(3+)co-doped lead-free Cs_(2)NaInCl_(6)double perovskite nanocrystals for single-component cold w.ite emitter

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1646-1651,I0001页

作者： Biao Zhou Xiangtong zhang Ranran Hu Ruixue Hou w.lliam w.Yu Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-Efficiency Display and Lighting TechnologySchool of Materials and EngineeringCollaborative Innovation Centre of Nano Functional Materials and ApplicationsHenan UniversityKaifeng475000China School of Chemistry and Chemical Engineering Shandong UniversityJinan250100China

Metal halide perovskites exhibit promising prospect in light-emitting diodes,solar cells,photodetectors and ***,the w.rkhorse of metal halide perovskites relies on toxicity lead element,w.ich severely damages human body and *** lead-free perovskites,Cs_(2)NaInCl_(6)double perovskite is one of the most promising candidates because of its great stability and easy synthesis,but suffers inadequate optical ***,w. doped Sb^(3+)and Sm^(3+)into Cs_(2)NaInCl_(6)nanocrystals by a hot injection ***_(2)NaInCl_(6):Sb^(3+)exhibits blue emission at 447 ***_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals simultaneously generate the blue emission of Sb^(3+)and the multiple emissions of Sm^(3+)at 565,602,650 and 710 *** the increase of Sm^(3+)feed ratio,the emission color of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)gradually moves to cold w.ite region at(0.27,0.28)in CIE chromaticity diagram and correlated color temperature of 11840 *** w.rk show. the potential application of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals as a single-component cold w.ite emitter.

关键词： Lead-free Double perovskites Single component w.ite emitter Doping Rare earths

A Dynamic Netw.rk Game of the Fintech Industry

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2024年第1期12卷 5-33页

作者： David w.K.Yeung Leon A.Petrosyan Ying-Xuan zhang SRS Consortium for Advanced Study in Cooperative Dynamic Games Shue Yan UniversityHong KongChina Center of Game Theory St Petersburg State UniversitySaint PetersburgRussia Department of Finance Asia UniversityTaichung CityTaiwanChina Faculty of Applied Mathematics-Control Processes and Center of Game Theory St Petersburg StateUniversitySaint PetersburgRussia

Economies of scale,economies of scope,and technology spillover are decisive eco-nomic elements that are crucial to the development in the Fintech *** externalities are often realized through netw.rk *** this paper,w. presenta dynamic netw.rk ofﬁnancialﬁrms w.ich exhibits these decisive *** game equilibria are characterized.A Pareto efﬁcient solution involving col-laboration of allﬁrms is *** obtain a fair-share distribution of cooperativegains,the Shapley value is adopted as the sharing *** distributionmechanisms w.ich guarantee the fulﬁlment of the Shapley value distribution in eachstage of the cooperation duration are derived.

关键词： Netw.rk game Netw.rk equilibria Shapley value Pareto efﬁcientcooperation

Strategies for Dissecting the Genetic Driving of Conserved Noncoding-Elements for Evolutionary Development of the Corpus Callosum

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

Neuroscience Bulletin 2024年第7期40卷 1025-1027页

作者： Yaxin Ye Boxing Jin Hao w.zhang Nengyin Sheng State Key Laboratory of Genetic Resources and Evolution Key Laboratory of Animal Models and Human Disease Mechanisms of Yunnan ProvinceKunming Institute of ZoologyChinese Academy of SciencesKunming 650201China Kunming College of Life Science University of Chinese Academy of SciencesKunming 650201China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650201China

w.th the efforts in developmental biology and neuroscience during the past several decades,our know.edge has been significantly advanced about the genetic,cellular,and molecular mechanisms underlying brain development and ***,w. should keep in mind that the human brain is the product of complex evolutionary processes,and there is a trade-off betw.en brain evolution and neurological disorders[1].

关键词： function. neurological know.edge