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33篇 您的检索式:作者名="Victor MA"
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1Impacts of degrading permafrost on streamflow in the source area of Yellow River on the Qinghai-Tibet Plateau,China显示文摘Many observations in and model simulations for northern basins have confirmed an increased streamflow from degrading permafrost,while the streamflow has declined in the source area of the Yellow River(SAYR,above the Tanag hydrological station)on the northeastern Qinghai-Tibet Plateau,West China.How and to what extent does the degrading permafrost change the flow in the SAYR?According to seasonal regimes of hydrological processes,the SAYR is divided intofour sub-basins with varied permafrost extents to detect impacts of permafrost degradation on the Yellow River streamflow.Results show that permafrost degradation may have released appreciable meltwater for recharging groundwater.The potential release rate of ground-ice melt-water in the Sub-basin 1(the headwater area of the Yellow River(HAYR),above the Huangheyan hydrological station)is the highest(5.6 mm per year),contributing to 14.4%of the annual Yellow River streamflow at Huangheyan.Seasonal/intra-and annual shifts of streamflow,a possible signal for the marked alteration of hydrological processes by permafrost degradation,is observed in the HAYR,but the shifts are minor in other sub-basins in the SAYR.Improved hydraulic connectivity is expected to occur during and after certain degrees of permafrost degradation.Direct impacts of permafrost degradation on the annual Yellow River streamflow in the SAYR at Tanag,i.e.,from the meltwater of ground-ice,is estimated at 4.9%that of the annual Yellow River discharge at Tanag,yet with a high uncertainty,due to neglecting of the improved hydraulic connections from permafrost degradation and the flow generation conditions for the ground-ice meltwater.Enhanced evapotranspiration,substantial weakening of the Southwest China Autumn Rain,and anthropogenic disturbances may largely account for the declined streamflow in the SAYR.MA Qiang JIN Hui-Jun Victor F.BENSE LUO Dong-Liang Sergey S.MARCHENKO Stuart A.HARRIS LAN Yong-Chao 2019Advances in Climate Change Research2019,10,4:9
2Regional Features and Seasonality of Land–Atmosphere Coupling over Eastern China显示文摘Land-atmosphere coupling is a key process of the climate system, and various coupling mechanisms have been proposed before based on observational and numerical analyses. The impact of soil moisture(SM) on evapotranspiration(ET) and further surface temperature(ST) is an important aspect of such coupling. Using ERA-Interim data and CLM4.0 offline simulation results, this study further explores the relationships between SM/ST and ET to better understand the complex nature of the land-atmosphere coupling(i.e., spatial and seasonal variations) in eastern China, a typical monsoon area. It is found that two diagnostics of land-atmosphere coupling(i.e., SM-ET correlation and ST-ET correlation) are highly dependent on the climatology of SM and ST. By combining the SM-ET and ST-ET relationships, two 'hot spots' of land-atmosphere coupling over eastern China are identified: Southwest China and North China. In Southwest China, ST is relatively high throughout the year, but SM is lowest in spring, resulting in a strong coupling in spring. However, in North China, SM is relatively low throughout the year, but ST is highest in summer, which leads to the strongest coupling in summer. Our results emphasize the dependence of land-atmosphere coupling on the seasonal evolution of climatic conditions and have implications for future studies related to land surface feedbacks.Chujie GAO Haishan CHEN Shanlei SUN Bei XU Victor ONGOMA Siguang ZHU Hedi MA Xing LI 2018Advances in Atmospheric Sciences2018,35,6:5
3Dissolved organic carbon in permafrost regions: A review显示文摘A large quantity of organic carbon(C) is stored in northern and elevational permafrost regions. A portion of this large terrestrial organic C pool will be transferred by water into soil solution(~0.4 Pg C yr^(-1))(1 Pg=10^(15) g), rivers (~0.06 Pg C yr^(-1)),wetlands, lakes, and oceans. The lateral transport of dissolved organic carbon(DOC) is the primary pathway, impacting river biogeochemistry and ecosystems. However, climate warming will substantially alter the lateral C shifts in permafrost regions.Vegetation, permafrost, precipitation, soil humidity and temperature, and microbial activities, among many other environmental factors, will shift substantially under a warming climate. It remains uncertain as to what extent the lateral C cycle is responding,and will respond, to climate change. This paper reviews recent studies on terrestrial origins of DOC, biodegradability, transfer pathways, and modelling, and on how to forecast of DOC fluxes in permafrost regions under a warming climate, as well as the potential anthropogenic impacts on DOC in permafrost regions. It is concluded that:(1) surface organic layer, permafrost soils,and vegetation leachates are the main DOC sources, with about 4.72 Pg C DOC stored in the topsoil at depths of 0–1 m in permafrost regions;(2) in-stream DOC concentrations vary spatially and temporally to a relatively small extent (1–60 mg C L^(-1)) and annual export varies from 0.1–10 g C m^(-2) yr^(-1);(3) biodegradability of DOC from the thawing permafrost can be as high as 71%, with a median at 52%;(4) DOC flux is controlled by multiple factors, mainly including vegetation, soil properties,permafrost occurrence, river discharge and other related environmental factors, and(5) many statistical and process-based models have been developed, but model predictions are inconsistent with observational results largely dependent on the individual watershed characteristics and future discharge trends. Thus, it is still difficult to predict how future lateral C flux will respond to climate change, but changes in the DOC regimes in individual catchments can be predicted with a reasonable reliability. It is advised that sampling protocols and preservation and analysis methods should be standardized, and analytical techniques at molecular scales and numerical modeling on thermokarsting processes should be prioritized.Qiang MA Huijun JIN Congrong YU Victor F.BENSE 2019Science China Earth Sciences2019,62,2:4
4Fast measurement of left ventricular mass with real-time three-dimensional echocardiography-Comparison with magnetic resonance imaging显示文摘Victor MA Lissa S Lynn W 2004Circulation2004,110,13:1
5Antiemetic efficacy of ondansetron and metoclopramide,both combined with corticosteroid,in malignant lym-phoma patients receiving non-cisplatin chemotherapy显示文摘Jorgensen M Victor MA 1996Acts Oncol1996,35,2:1
6Studies on the structure–activity relationship of 1,3,3,4-tetra-substituted pyrrolidine embodied CCR5 receptor antagonists. Part 2: Discovery of highly potent anti-HIV agents显示文摘Ben Li Eric Dale Jones Enkun Zhou Li Chen Dean Cameron Baylis Shanghai Yu Miao Wang Xing He Jonathan Alan Victor Coates David Ian Rhodes Gang Pei John Joseph Deadman Xin Xie Dawei Ma 2010Bioorganic & Medicinal Chemistry Letters2010,,17:1
7Nano-fibrous poly( l -lactic acid) scaffolds with interconnected spherical macropores显示文摘Victor J. Chen Peter X. Ma 2003Biomaterials2003,,11:1
8Nano-fibrous scaffolding architecture selectively enhances protein adsorption contributing to cell attachment biometarials 显示文摘Kyung M W Chen Victor J Ma X Peter 2003J Biomed Mater Res2003,67,2:1
9Attrition resistance and catalytic performance of spray-dried iron Fischer-Tropsch catalysts in a stirred-tank slurry reactor 显示文摘Dragomir B Bukur Ma Wenping Victor Carreto Vazquez 2004Ind Eng Chem Res2004,43,6:1
10显示文摘Chen Victor J Ma Peter X 2004Biomaterials2004,25,11:1
11CD34-Positive Cells Exhibit Increased Potency and Safety for Therapeutic Neovascularization After Myocardial Infarction Compared With Total Mononuclear Cells显示文摘Atsuhiko Kawamoto Hiroto Iwasaki Kengo Kusano Toshinori Murayama Akira Oyamada Marcy Silver Christine Hulbert Mary Gavin Allison Hanley Hong Ma Marianne Kearney Victor Zak Takayuki Asahara Douglas W. Losordo 2006Circulation2006,,20:1
12Mesenchymal stem cells engineered to express selectin ligands and IL-10 exert enhanced therapeutic efficacy in murine experimental autoimmune encephalomyelitis显示文摘Wenbin Liao Victor Pham Linan Liu Milad Riazifar Egest J. Pone Shirley Xian Zhang Fengxia Ma Mengrou Lu Craig M. Walsh Weian Zhao 2016Biomaterials2016,,:1
13CDKN2A/p16 Inactivation Mechanisms and Their Relationship to Smoke Exposure and Molecular Features in Non–Small-Cell Lung Cancer显示文摘Kit W. Tam Wei Zhang Junichi Soh Victor Stastny Min Chen Han Sun Kelsie Thu Jonathan J. Rios Chenchen Yang Crystal N. Marconett Suhaida. A. Selamat Ite A. Laird-Offringa Ayumu Taguchi Samir Hanash David Shames Xiaotu Ma Michael Q. Zhang Wan L. Lam Adi Gaz 2013Journal of Thoracic Oncology2013,,11:1
14Nano-fibrous poly(L-lactic acid) scaffolds with interconnected spherical macropores显示文摘Chen Victor J Ma Peter X 2004Biomaterials2004,25,11:1
15Nano-fibrous scaffolding promotes osteoblast differentiation and biomineralization显示文摘Kyung Mi Woo Ji-Hae Jun Victor J. Chen Jihye Seo Jeong-Hwa Baek Hyun-Mo Ryoo Gwan-Shik Kim Martha J. Somerman Peter X. Ma 2006Biomaterials2006,,2:1
16Fast measurement of left ventricular mass with real time three dimensional echocardiography -comparison with magnetic resonance imaging显示文摘Victor MA Lissa S Lynn W 2004Circulation2004,110,13:1
17Study on catalytic performance and attrition strength of the Ruhrchemie catalyst for the Hscher-Tropsch synthesis in a stirred tank slurry reactor显示文摘Wenping Ma Yunjie Ding Victor H 2004Applied Catalysis A2004,268,:1
18Association of Exon 19 and 21 EGFR Mutation Patterns with Treatment Outcome after First-Line Tyrosine Kinase Inhibitor in Metastatic Non–Small-Cell Lung Cancer显示文摘Victor H.F. Lee Vicky P.C. Tin Tim-shing Choy Ka-on Lam Cheuk-wai Choi Lap-ping Chung Janice W.H. Tsang Patty P.Y. Ho Dennis K.C. Leung Edmond S.K. Ma Jing Liu Tony W.H. Shek Dora L.W. Kwong To-wai Leung Maria P. Wong 2013Journal of Thoracic Oncology2013,,:1
19Effect of TiO2 containing fluxes on the mechanical properties and microstructure in submerged arc weld steels 显示文摘PANIAGUA MERCADO ANA MA LOPEZ HIRATA VICTOR M DORANTES ROSALES HECTOR J 2009Materials Characterization2009,60,:1
20Quantitative evaluation of global and regional left ventricular diastolic function with color kinesis 显示文摘Philippe V Victor MA Lynn W 1998Circulation1998,97,11:1
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