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Search Results: 1 - 10 of 24002 matches for " JIANG Xingwen "
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Water vapor transport over China and its relationship with drought and flood in Yangtze River Basin

JIANG Xingwen,LI Yueqing,WANG Xin,

地理学报 , 2009,
Abstract: The characteristics of water vapor transport (WVT) over China and its relationship with precipitation anomalies in the Yangtze River Basin (YRB) are analyzed by using the upper-air station data in China and ECMWF reanalysis data in summer from 1981 to 2002. The results indicate that the first mode of the vertically integrated WVT is significant whose spatial distribution presents water vapor convergence or divergence in the YRB. When the Western Pacific Subtropical High (WPSH) is strong and shifts southward and westward, the Indian Monsoon Low Pressure (IMLP) is weak, and the northern part of China stands behind the middle and high latitude trough, a large amount of water vapor from the Bay of Bengal (BOB), the South China Sea (SCS) and the western Pacific forms a strong and steady southwest WVT band and meets the strong cold water vapor from northern China in the YRB, thus it is likely to cause flood in the YRB. When WPSH is weak and shifts northward and eastward, IMLP is strong, and there is nearly straight west wind over the middle and high latitude, it is unfavorable for oceanic vapor extending to China and no steady and strong southwest WVT exists in the region south of the YRB. Meanwhile, the cold air from northern China is weak and can hardly be transported to the YRB. This brings on no obvious water vapor convergence, and then less precipitation in the YRB.
Sinusoidal phase modulating interferometer for real-time surface profile measurement
He Guotian,Jiang Helun,Tan Xingwen
Optica Applicata , 2008,
Abstract: The optical interferometry for the surface profile measurement is high accuracy, non-contact, and has a wide application in industry and scientific research. In this paper, a sinusoidal phase modulating (SPM) interferometer to realize real-time surface profile measurement is proposed, and its measuring principle is analyzed theoretically. In the SPM interferometer, the interference signal is detected by a high speed image sensor based on a low-speed CCD and a signal processing circuit is used to obtain the phase of each point on the surface. Therefore, the surface profile can be measured real time. The experiments measuring the surface profile of a wedge-shaped optical flat show that the measurement time of the SPM interferometer is less than 10 ms, the repetitive measurement accuracy is 5.2 nm. The experimental results confirm the validity of the SPM interferometer, and the merits of the interferometer is simple structure, high measurement accuracy.
Climatological Characteristics of Surface Radiation over the Tibetan Plateau
青藏高原地表辐射的气候特征

JIANG Xingwen,LI Yueqing,
蒋兴文
,李跃清

资源科学 , 2010,
Abstract: Climatological characteristics of surface radiation over the Tibetan Plateau (TP) are still unclear due to relatively sparse observations caused by the harsh environment. Using the state-of-the-art satellite products of surface radiation provided by the Global Energy and Water Cycle Experiment-Surface Radiation Budget (GEWEX-SRB), flux characteristics of surface downward and upward shortwave and longwave radiation, effective radiation and net radiation, and their relationships with cloud were comprehensively investigated. The maximum surface downward shortwave radiation flux (SDSWRF) was observed to be over the southwestern TP around the year. The minimum SDSWRF was distributed in the lower reaches of the Brahmaputra River. As for seasonal variation, the maximum SDSWRF was found to be in summer over portions of the southwestern and southeastern TP. The maximum surface upward shortwave radiation flux (SUSWRF) generally took place in spring. The minimum SUSWRF, however, varies with locations. The complexity of the temporal-spatial distribution of land surface albedo would be the principal reason for the spatial and temporal heterogeneity in SUSWRF. Spatial distributions of surface downward longwave radiation flux (SDLWRF) and surface upward longwave radiation flux (SULWRF) were both characterized by that the minimum values were found to be approximately in the center of the TP. The magnitude of both SDLWRF and SULWRF seemed to be similar in spring and autumn, which were larger than in winter and less than in summer. The effective radiation flux was positive all year around. It was found that in general, the surface net radiation flux (SNRF) decreased gradually from the south to the north over the study area. The minimum SNRF were distributed in the Qaidam Basin and the lower reaches of the Brahmaputra River. The maximum cloud radiative forcing of surface downward shortwave (CRFSDSW) was in the southeastern TP in summer, and the minimum was in the west part of the TP in winter. Characteristics of cloud radiative forcing of surface upward shortwave were observed to be the same as CRFSDSW. The value of cloud radiative forcing of surface downward longwave (CRFSDLW) remained positive all year around, whose maximum was over the west edge of TP, and the minimum was generally in the southwest of the TP. The magnitude of cloud radiation forcing of surface upward longwave was generally small. As a result, the spatial pattern of cloud radiative forcing of surface effective radiation was the same as the minus of CRFSDLW. The cloud radiative forcing of surface net flux (CRFSNF) was generally negative in spring and summer across the TP. It was negative in the southeastern TP and positive in the northwestern TP in autumn. In general, CRFSNF was homogenous and positive over the TP. The magnitude of CRFSNF peaked in summer and was smallest in autumn and winter.
Rough Set Approach to Multivariate Decision Trees Inducing
Dianhong Wang,Xingwen Liu,Liangxiao Jiang,Xiaoting Zhang
Journal of Computers , 2012, DOI: 10.4304/jcp.7.4.870-879
Abstract: Aimed at the problem of huge computation, large tree size and over-fitting of the testing data for multivariate decision tree (MDT) algorithms, we proposed a novel rough set-based multivariate decision trees (RSMDT) method. In this paper, the positive region degree of condition attributes with respect to decision attributes in rough set theory is used for selecting attributes in multivariate tests. And a new concept of extended generalization of one equivalence relation corresponding to another one is introduced and used for construction of multivariate tests. We experimentally test RSMDT algorithm in terms of classification accuracy, tree size and computing time, using the whole 36 UCI Machine Learning Repository data sets selected by Weka platform, and compare it with C4.5, classification and regression trees (CART), classification and regression trees with linear combinations (CART-LC), Oblique Classifier 1 (OC1), Quick Unbiased Efficient Statistical Trees (QUEST). The experimental results indicate that RSMDT algorithm significantly outperforms the comparison classification algorithms with improved classification accuracy, relatively small tree size, and shorter computing time.
Water Vapor Transportation over China and Its Relationship with Draught and Flood in the Yangtze River Basin
中国地区水汽输送异常特征及其 与长江流域旱涝的关系

JIANG Xingwen,LI Yueqing,WANG Xin,
蒋兴文
,李跃清,王鑫

地理学报 , 2008,
Abstract: The characteristics of water vapor transportation over China and its relationship with precipitation anomalies in the Yangtze River Basin are analyzed by using the observed data in China and ECMWF reanalysis data from 1981 to 2002 in summer. The results indicate that the first mode of the integrated water vapor transportation is significant whose spatial distribution presents water vapor convergence or divergence in the Yangtze River Basin, and whose variation has a close relationship with the precipitation in the Yangtze River Basin. When the Western Pacific Subtropical High (WPSH) is strong and shifts southward and westward, the Indian Monsoon Low Pressure (IMLP) is weak, and the northern part of China stands behind of the middle and high latitude trough, a large amount of water vapor from Bay of Bengal (BOB), South China Sea (SCS) and Western Pacific forms a strong and steady southwest water vapor band and meets the strong cold water vapor from northern China in the Yangtze River Basin, thus it is likely to cause flood in the Yangtze River Basin. When WPSH is weak and shifts northward and eastward, IMLP is strong, and there is nearly straight west wind over the middle and high latitude, it is unfavorable for oceanic vapor extending to China and no steady and strong southwest water vapor transportation exists in the region south of the Yangtze River. Meanwhile the cold air from northern China is weak and can hardly be transported to the Yangtze River Basin. This brings on no obvious water vapor convergence and less precipitation in the Yangtze River Basin.
四川盆地低涡的月际变化及其日降水分布统计特征
李超 LI Chao,李跃清 LI Yueqing,蒋兴文 JIANG Xingwen
大气科学 , 2015, DOI: 10.3878/j.issn.1006-9895.1502.14270
Abstract: 利用ERA-interim再分析资料和全国824个气象基准站的日降水资料,统计分析了1983年1月1日~2012年12月31日发生在四川盆地的低涡天气过程及其降水特征,结果表明:盆地涡初生位置主要位于盆地的西南部和东北部,盆地涡夏季出现最多,冬季出现最少,其中初生位置位于盆地西南部的低涡7月出现最多,12月和1月出现最少;位于东北部的低涡6月出现最多,1月出现最少;盆地涡具有明显的日变化,西南型盆地涡3~10月夜晚发生概率均大于白天,其他月份低涡夜发性不明显,而东北型盆地涡只在5~9月期间夜晚发生概率大于白天,其他月份低涡夜发性不明显;盆地涡生命史与对流程度具有相关性,对流发展有利于盆地涡长时间维持,然而,夏季西南型盆地涡即使对流没向上发展也能长时间维持;盆地涡夏季移出最多,尤其以7、8月最明显,冬季移出最少,7月前以偏东路径为主,7月后以东北路径为主;盆地涡频数的月际变化与川西高原西南涡源地的风场扰动移出有密切联系,九龙地区夏季风场扰动移出活跃,冬季移出不活跃。小金地区春季风场扰动移出活跃,冬季移出不活跃。九龙地区风场扰动移出对盆地涡频数的月际变化贡献明显,小金地区风场扰动移出对盆地涡频数的月际变化贡献不明显;夏半年(5~10月)西南型盆地涡和东北型盆地涡引起的日降水区域分布的月际变化特征不同,前者的日降水最大值中心随月份先由盆地东北部向西南部移动,之后再由盆地西南部向东北部折回,后者的日降水最大值中心会一直稳定维持在盆地的东北部达州地区。东北型盆地涡虽然出现频次低,但各月的日降水强度要远大于西南型盆地涡。
The comparison of the efficacy of swine FMD vaccine emulsified with oil adjuvant of ISA 201 VG or ISA 206 VG  [PDF]
Dong Li, Chunxue Zhou, Daliang She, Pinghua Li, Pu Sun, Xingwen Bai, Yingli Chen, Baoxia Xie, Zaixin Liu
Journal of Biosciences and Medicines (JBM) , 2013, DOI: 10.4236/jbm.2013.13005
Abstract:

The Seppic Company developed a new adjuvant Montanide ISA 201 VG, the upgraded version of Montanide ISA 206 VG, which keep the advantage and added some chemical components on the basis of ISA 206 to improve the cellular responses. The aim of the study is to compare the efficacy of swine FMD (foot-and-mouth) vaccine emulsified with oil adjuvant of ISA 201 or ISA 206 respectively. The pigs were vaccinated with FMD vaccine emulsified with inactive FMD type O antigen and adjuvant ISA 201 or ISA 206 respectively, according to 2.0 ml (1/1 dose), 0.67 ml (1/3 dose), 0.22 ml (1/9 dose) to calculate their PD50. The sera were collected from the vaccination of the day 0, 3, 7, 14, 21, 28 and the ELISA FMD type O antibody were detected. Furthermore, the PD50 were calculated after the pigs were challenged with virulent FMDV type O on 28 days post vaccination. The ELISA antibody titers of 201vaccine were significantly higher than that of 206 (except the third time). The fifty percent of protection dose (PD50) of 201 vaccine (PD50 = 15.59) was higher than that of 206 vaccine (PD50 = 10.05). The above data showed that the efficacy of the FMD vaccine emulsified with ISA 201 was better than which with ISA 206.

Gene expression profiling in a mouse model of infantile neuronal ceroid lipofuscinosis reveals upregulation of immediate early genes and mediators of the inflammatory response
Xingwen Qiao, Jui-Yun Lu, Sandra L Hofmann
BMC Neuroscience , 2007, DOI: 10.1186/1471-2202-8-95
Abstract: A total of 267 genes were significantly (approximately 2-fold) up- or downregulated over the course of the disease. Immediate early genes (Arc, Cyr61, c-fos, jun-b, btg2, NR4A1) were among the first genes upregulated during the presymptomatic period whereas immune response genes dominated at later time points. Chemokine ligands and protease inhibitors were among the most transcriptionally responsive genes. Neuronal survival factors (IGF-1 and CNTF) and a negative regulator of neuronal apoptosis (DAP kinase-1) were upregulated late in the course of the disease. Few genes were downregulated; these included the α2 subunit of the GABA-A receptor, a component of cortical and hippocampal neurons, and Hes5, a transcription factor important in neuronal differentiation.A molecular description of gene expression changes occurring in the brain throughout the course of neuronal ceroid lipofuscinosis suggests distinct phases of disease progression, provides clues to potential markers of disease activity, and points to new targets for therapy.An unusual group of lysosomal storage disorders, the neuronal ceroid lipofuscinoses, are characterized by retinal and cortical neurodegeneration with scant autofluorescent storage material that accumulates in the brain and peripheral tissues (reviewed in [1]). Distinct subsets of NCL are recognized based on characteristic appearance by electron microscopy that include granular osmiophilic deposits and/or various membrane profiles (curvilinear, fingerprint, and rectilinear) [2]. Autosomal recessive mutations in at least seven different genes are responsible for these disorders [3], and while the function of only a few is known, each appears to participate in some aspect of endo/lysosomal function [4]. The CLN1 (ceroid lipofuscinosis, neuronal-1) gene encodes a soluble lysosomal palmitoyl-protein thioesterase (PPT1) that functions to remove fatty acids (usually palmitate) from modified cysteine residues in proteins [5,6]. A growing number of s
Infusion of methylphenidate into the basolateral nucleus of amygdala or anterior cingulate cortex enhances fear memory consolidation in rats
XinLing Zheng,Fang Liu,XingWen Wu,BaoMing Li
Science China Life Sciences , 2008, DOI: 10.1007/s11427-008-0105-x
Abstract: The psychostimulant methylphenidate (MPD; also called Ritalin) is a blocker of dopamine and norepinephrine transporter. It has been clinically used for treatment of Attention Deficit and Hyperactivity Disorder (ADHD). There have been inconsistent reports regarding the effects of systemically administered MPD on learning and memory, either in animals or humans. In the present study, we investigated the effect of direct infusion of MPD into the basolateral nucleus of amygdala (BLA) or the anterior cingulate cortex (ACC) on conditioned fear memory. Rats were trained on a one-trial step-through inhibitory avoidance task. MPD was infused bilaterally into the BLA or the ACC, either at ‘0’ or 6 h post-training. Saline was administered as control. Memory retention was tested 48 h post-training. Intra-BLA or intra-ACC infusion of MPD ‘0’ h but not 6 h post-training significantly improved 48-h memory retention: the MPD-treated rats had significant longer step-through latency than controls. The present results indicate that action of MPD in the BLA or the ACC produces a beneficial effect on the consolidation of inhibitory avoidance memory.
The theory and application about the regionalization of Chinese ecological assets
中国生态资产区划的理论与应用

HUANG Xingwen,CHEN Baiming,
黄兴文
,陈百明

生态学报 , 1999,
Abstract: The theory and the methodology of the evaluation and regionalization of the ecological assets of China is analyzed and approached.On the basis of definitions of conceptions of ecological assets and value formation,the paper puts forward theoretical foundation,basic hypothesis,regionalized program and method system of the evaluation of ecological assets,and works out a preliminary scheme of regionalization of ecological assets in China by applying the method of integrated evaluation.
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