|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Guidelines for evaluation and management of cerebral collateral circulation in ischaemic stroke 2017显示文摘Collateral circulation plays a vital role in sustaining blood flow to the ischaemic areas in acute,subacute or chronic phases after an ischaemic stroke or transient ischaemic attack.Good collateral circulation has shown protective effects towards a favourable functional outcome and a lower risk of recurrence in stroke attributed to different aetiologies or undergoing medical or endovascular treatment.Over the past decade,the importance of collateral circulation has attracted more attention and is becoming a hot spot for research.However,the diversity in imaging methods and criteria to evaluate collateral circulation has hindered comparisons of findings from different cohorts and further studies in exploring the clinical relevance of collateral circulation and possible methods to enhance collateral flow.The statement is aimed to update currently available evidence and provide evidence-based recommendations regarding grading methods for collateral circulation,its significance in patients with stroke and methods under investigation to improve collateral flow. | Liping Liu Jing Ding Xinyi Leng Yuehua Pu Li-An Huang Anding Xu Ka Sing Lawrence Wong Xin Wang Yongjun Wang 无 | 2018 | Stroke & Vascular Neurology2018，3，3： | 37 |
| 2 | Macroscopic relationship for preferential flow in the vadose zone:Theory and validation显示文摘Preferential flow commonly observed in unsaturated soils allows rapid movement of solute from the ground surface or vadose zone to the groundwater, bypassing a significant volume of unsaturated soil and increasing the risk of groundwater contamination. A variety of evidence indicates that complex preferential flow patterns observed from fields are fractals. This paper discusses a macroscopic relationship for modeling preferential flow in the vadose zone. Conceptually, the flow domain can be divided into active and inactive regions. Flow occurs preferentially in the active region (characterized by fractals), and inactive region is simply bypassed. The portion of the active region was found to be a power function of saturation. The validity of this macroscopic relationship is demonstrated by its consistency with field observations and the related numerical experiments. | LIU HuiHai1 & ZHANG RenDuo2 1 Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 947200, USA 2 School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China | 2009 | Science China(Technological Sciences)2009，52，11： | 5 |
| 3 | CONTROLLING HIGHTEMPERATURE DEFORMATION BY VARYING MICROSTRUCTURE IN A Ti47Al2Cr2Nb ALLOY显示文摘A Ti 47Al 2Cr 2Nb alloy was made by powder extrusion methods. By varying extrusion temperature, different microstructures were produced. At an extrusion temperature of 1 400 ℃ (above α transus), a uniform, fully lamellar structure was observed. In contrast, when powders were extruded at 1 150 ℃, an inhomogeneous microstructure consisting of γ,α 2 and metastable β phases was obtained. It was demonstrated that, while alloy extruded at 1 400 ℃ exhibited an excellent creep resistance, alloy with the same composition extruded at 1 150 ℃ exhibited superplasticity. The good creep resistance was resulted from the presence of fine lamellae which restrict dislocation slip within γ grains. These fine lamellae also promote the nucleation of deformation twins which impede dislocation glide along the interfaces ( γ/γ and γ/α 2) and, thus, reduces creep rate. In the case of low temperature extrusion, an elongation value of over 300% was obtained at a strain rate of 2×10 -5 s -1 and at a temperature as low as 800 ℃, which is close to the ductile to brittle transition temperature. This is in contrast to the prior major observations of superplastic behaviors in TiAl in which typical temperatures of 1 000 ℃ have usually been required for superplasticity. It was proposed that the occurrence of superplasticity at 800 ℃ is caused by the presence of a B2 phase which, during superplastic deformation (grain boundary sliding), accommodates sliding strains to reduce the propensity for cavitation at grain triple junctions and, thus, delays the fracture process. | T.G.Nieh and J.Wadsworth Lawrence Livermore National Laboratory, L-369, P.O.Box 808, Livermore, CA 94550, U.S.A. | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 5 |
| 4 | The Effect of the Oxygen Preadsorption on the Adsorption of Nitric Oxide on Mo (111)显示文摘The adsorption of nitric oxide adsorption on clean Mod(111), Mo(111)/O2-(4×4), Mo(111)/O2-(1×3), Mo(111)/O2-(112) facets and Mo(111) oxide surfaces was studied. Mass 28 (N2) desorption spectra show two high temperature peaks at approximate 1030 (β1) and 1200K (β2). For NO exposures less than 0. 1 L only the ft peak was observed. At higher exposures, the ft peak appeared and small amounts of N2O as well as NO desorbed. The preadsorption of oxygen blocked the β2 desorption partially on the (4×4) and (1×3) surfaces and fully on the (112) facet and oxide surfaces. In addition, the β1 desorption peak shifted to higher temperatures with increasing oxygen preexposure. | WANG Guo-Jia (Department of Chemistry, Jilin University, Changchun, 130023)K. B. Lewis and G. A. Somorjai(Materials and Molecular Research Division Lawrence Berkeley Laboratory and Department of Chemistry, University of California Berkeley, California, 94720, U. S. A. ) | 1993 | Chemical Research in Chinese Universities1993，9，3： | 3 |
| 5 | EFFECTS OF ALLOYING ELEMENTS ON CREEP OF TiAl ALLOYS WITH FINELAMELLAR STRUCTURES显示文摘Creep experiments have been conducted on five powder metallurgy TiAl alloys with fine grains (65~80 μm), fine lamellar spacings (0.1~0.16 μm), and different compositions [Ti 47Al(+Cr, Nb, Ta, W, Si)] at temperatures of 760 ℃ and 815 ℃ and stresses from 35 to 723 MPa. Results show that at a given lamellar spacing 1% Nb(mole fraction) with 1% Ta and replacing 0.2% Ta with 0.2% W induced little effect, but addition of 0.3% Si decreased the creep resistance by a factor of 3~4 under otherwise identical conditions. These different effects of different alloying elements are interpreted in terms of the interaction of alloy segregants with misfit and/or misorientaion dislocations at the lamellar interface. That is, the interaction retards or facilitates the climb of interfacial dislocations, which is rate controlling during creep, depending on the size of the segregants relative to the host atoms. | J.N.Wang, B.Y.Huang and T.G.Nieh National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China Lawrence Livermore National Laboratory, P.O.Box 808, Livermore, CA 94550, U.S.A. | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 2 |
| 6 | Recent Advance in the Electrochemical Detection of Sulphide and Sulphhydryl Species显示文摘This article aims at providing a critical review of some most recent developments in the electrochemical detection and measurement of hydrogen sulphide and the related species, which are of great significance to a variety of industries and in environmental moitoring. The molecular recognition processes are initiated by using either an organic precursor or a catalytic complex, leading to extensive ranges of detection. A series of advanced chemical and simulation techniques are used to probe the mechanistic details of the analytical chemistry involved. | Nathan S. Lawrence 1, Timothy G. J. Jones 2, Richard G. Compton 1 and Li Jiang 2 1. Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK 2. Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge, | 2002 | Chemical Research in Chinese Universities2002，18，2： | 2 |
| 7 | Relationships between soil properties and vegetation at the Northern Experimental Forest, Howland, Maine显示文摘 | LEVINE L R KNOX R G AND LAWRENCE W T | 1994 | Remote Sensing of Environment1994，47，： | 1 |
| 8 | Wein,2005,A smart Market for industrial procurement with capacity constraints显示文摘 | Jeremie Gallien and Lawrence M | 2005 | Management Science2005，51，1： | 1 |
| 9 | How Invest-ment Bankers Determine the Offer Price and Allocation of NewIssues显示文摘 | Benveniste Lawrence M and Paul A Spindt | 1989 | Journal of Financial Economics1989，，24： | 1 |
| 10 | Meyer,The impact of the potential duration of unemployment benefits on the duration of unemployment 显示文摘 | Katz Lawrence F and Bruce D | 1990 | Journal of Public Economics1990，41，： | 1 |
| 11 | Rural resident tourism perceptions and attitudes 显示文摘 | Perdue Richard Long Patrick and Allen Lawrence | 1987 | Annals of Tourism Research1987，14，： | 1 |
| 12 | Noise Trader Risk in Finance Market显示文摘 | De Long J Bradford Andrei Shleifer Lawrence H Summers and Robert Waldman | 1990 | Journal of Political Economy1990，，98： | 1 |
| 13 | Summer, 1986, Hysteresis and the European Unemployment Problem 显示文摘 | Blanchard Oliver and Lawrence H | 1986 | NBER Macroeeonomics Annual 11986，1578，： | 1 |
| 14 | The anatomy of a large-scale hypertextual web search engine显示文摘 | Sergey Brin and Lawrence Page | 1998 | Comput- er Networks and ISDN Systems1998，30，17： | 1 |
| 15 | Radiologieal assessment of osteoarthrosis 显示文摘 | JH Kellgron and JS Lawrence | 1957 | Ann Rheum Dis1957，16，4： | 1 |
| 16 | Evolution of Coenzyme B12 Bynthesis Among Enteric Bacteria: Evidence for Loss and Reacquisition of a Multigene Complex显示文摘 | Lawrence J and J Roth | 1997 | Genetics1997，142，： | 1 |
| 17 | Identification of ground targets from sequential high-range-resolution radar signatures显示文摘 | Lifo Xue-jun Paul R and Lawrence C | 2002 | IEEE Transactions on Aerospace and Electronic Systems2002，38，4： | 1 |
| 18 | Variation in leaf litter nutrients of a Costa Rican rain forest is related to precipitation 显示文摘 | Tana E Wood Deborah Lawrence and Deborah A Clark | 2005 | Biogeochemistry2005，73，2： | 1 |
| 19 | Postbifurcation Behavior of Wrinkles in Square Metal Sheets Under Yoshida Test显示文摘 | Xiaofang Wang and Lawrence H N Lee | 1993 | International Journal of Plasticity1993，，9： | 1 |
| 20 | Beyond vertical integration: The rise of the value-adding partnership显示文摘 | Russell Johnston and Paul R Lawrence | 1988 | Harvard Business Review1988，66，78： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员