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Search Results: 1 - 10 of 101 matches for " Yushu "
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Phase Transition Dynamics and Its Alpha' Corrections
Song, Yushu
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.76.106014
Abstract: We study the dynamics of the first order phase transition in the holographic hard wall model, namely, Polchinski-Strassler's model and come to the conclusion that the phase transition is incomplete in large N limit with the natural boundary condition. We also consider the string length corrections to both hard wall model and Witten's model, and find that the interesting transition configuration is preserved under the alpha' corrections.
棉花学报 , 2008,
棉花学报 , 2008,
棉花学报 , 2008,
Effects of Methylprednisolone on the Expression and Activity of Calpain Following Ischemia-Reperfusion Spinal Cord Injury in Rats  [PDF]
Zifeng Zhang, Jinquan Xu, Yushu Bai, Tiesheng Hou
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51005

The present study was undertaken to examine the effects of methylprednisolone on the expression and activity of calpain in spinal cord tissue following spinal cord ischemia-reperfusion injury in rats. Adult male Sprague-Dawley rats were subjected to sham operations, ischemia-reperfusion and vehicle treated, or ischemia-reperfusion with methylprednisolone administration after injury. The expression of calpain I in the injured segments of the spinal cord as well as the degradation of the 68 kD neurofilament protein (NFP), a calpain-specific substrate, was determined at 3 h, 24 h, 72 h and 7 days after reperfusion using immunohistochemical labeling and western blot analysis, respectively. Three hours after spinal cord reperfusion, calpain I-positive cells and NFP degradation products were evident. The number of positive cells and immunoreactivity increased with time and peaked at 72 h after reperfusion. In addition, the number of calpain I-positive cells and the abundance of NFP degradation products were significantly lower in the methylprednisolone group, compared with vehicle treated animals following ischemia-reperfusion injury. The results of this study suggest that methylprednisolone can inhibit the expression and degradation activity of calpain following ischemia-reperfusion injury, providing further insight into the therapeutic benefits of methylprednisolone treatment for spinal cord injury.



生态学报 , 1983,
Abstract: The regularity of transportation and accumulation of Pb-pollution in water and in hydrophytes is dealt with in this paper. The results show that the accumulative ability of Pb-pollution of plants is quite different, their order being Myriophyllum spicatum>Spirodela polyrhiza> Hydrocharis dubia>Eichhornia crassipes>Nymphoides peltatum, and that the resistance of plants to Pb-pollution is also very different, their order being Eichhornia era-ssipes->Myriophyllum spicatum>Spirodela polyrhiza>Nymphoides peltatu...

Wu yushu,

生态学报 , 1988,
Abstract: This paper deals with the purification efficiency of five hydrophytes growing in natural ponds and estuaries to the eutrophic ation (nitrogen and phosphorus) and heavy-metals polluted water of Dianchi Lake. Kunming.The results show that these hydrophytes can eliminate N,P and heavy metals six elements-Pb,Cd,Cr, Ni, Zn, Cu have been studied) from the water and the mud through absorption and accumulation . As the content of pollutants in water and mud is reduced, the pH value, COD value and the turbidity of t...
A Modeling Study of Surface Rainfall Processes Associated with a Torrential Rainfall Event over Hubei, China, during July 2007

ZHOU Yushu,CUI Chunguang,

大气科学进展 , 2011,
Abstract: The surface rainfall processes associated with the torrential rainfall event over Hubei, China, during July 2007 were investigated using a two-dimensional cloud-resolving model. The model integrated the large-scale vertical velocity and zonal wind data from National Centers for Environmental Prediction (NCEP)/Global Data Assimilation System (GDAS) for 5 days. The time and model domain mean surface rain rate was used to identify the onset, mature, and decay periods of rainfall. During the onset period, the descending motion data imposed in the lower troposphere led to a large contribution of stratiform rainfall to the model domain mean surface rainfall. The local atmospheric drying and transport of rain from convective regions mainly contributes to the stratiform rainfall. During the mature periods, the ascending motion data integrated into the model was so strong that water vapor convergence was the dominant process for both convective and stratiform rainfall. Both convective and stratiform rainfalls made important contributions to the model domain mean surface rainfall. During the decay period, descending motion data input into the model prevailed, making stratiform rainfall dominant. Stratiform rainfall was mainly caused by the water vapor convergence over raining stratiform regions.
An Analysis of Thermally-Related Surface Rainfall Budgets Associated with Convective and Stratiform Rainfall

ZHOU Yushu,Xiaofan LI,

大气科学进展 , 2011,
Abstract: Both water vapor and heat processes play key roles in producing surface rainfall. While the water vapor effects of sea surface temperature and cloud radiative and microphysical processes on surface rainfall have been investigated in previous studies, the thermal effects on rainfall are analyzed in this study using a series of two-dimensional equilibrium cloud-resolving model experiments forced by zonally-uniform, constant, large-scale zonal wind and zero large-scale vertical velocity. The analysis of thermally-related surface rainfall budget reveals that the model domain mean surface rain rate is primarily associated with the mean infrared cooling rate. Convective rainfall and transport of hydrometeor concentration from convective regions to raining stratiform regions corresponds to the heat divergence over convective regions, whereas stratiform rainfall corresponds to the transport of hydrometeor concentration from convective regions and heat divergence over raining stratiform regions. The heat divergence over convective regions is mainly balanced by the heat convergence over rainfall-free regions, which is, in turn, offset by the radiative cooling over rainfall-free regions. The sensitivity experiments of rainfall to the effects of sea surface temperature and cloud radiative and microphysical processes show that the sea surface temperature and cloud processes affect convective rainfall through the changes in infrared cooling rate over rainfall-free regions and transport rate of heat from convective regions to rainfall-free regions.
周玉淑 ZHOU Yushu
大气科学 , 2009, DOI: 10.3878/j.issn.1006-9895.2009.05.19
Abstract: 利用中尺度数值模式MM5,以6h间隔的NCEP/NCAR1°×1°的格点资料为背景,加入新一代天气雷达(CINRAD-SA雷达)1h间隔的反演风廓线资料和12h探空、3h常规地面观测进行四维同化模拟得到的输出资料,检验非均匀饱和大气中的广义湿位涡在2003年江淮流域暴雨动力指示方面的分析和预报能力。理论分析表明:广义湿位涡综合体现了大气的动力、热力及水汽作用,相对于常用的温度、湿度等物理量来说,在一定程度上包含了风场、温度场和湿度场的相互作用,对实际非均匀饱和大气的热力变化和水汽影响有较好的反映。对模拟结果的诊断发现,广义湿位涡倾向值的正负及强弱变化对暴雨落区预报和单站降水变化趋势预报都有一定的指示意义。利用NCEP/NCAR1°×1°格点资料和气象台站观测的实况降水资料,对1999年长江流域梅雨和2007年淮河流域大洪水时期的广义湿位涡及其倾向变化与区域平均降水变化的对比分析进一步表明了在持续性暴雨发生时期,在大气中低层(主要在500hPa以下),确实持续存在广义湿位涡和广义湿位涡倾向的异常,这种异常能在一定程度上反映出对应时期的水汽分布和水汽集中特征,与降水量的变化是一致的,而850hPa以下的广义湿位涡倾向在一定程度上也能反映出降水的增强或减弱趋势,即:广义湿位涡倾向为正(负)异常时,未来降水量可能增加(减小),因此,广义湿位涡倾向可以定性地给出暴雨是加强还是减弱的强度趋势预报。类似于涡度、湿位涡等其他动力变量,广义湿位涡除了可作为一个分析暴雨系统发生发展的动力变量外,还可体现出暴雨时期高水汽集中的特点,在暴雨分析中有一定的优势。
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