Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 35 )

2018 ( 415 )

2017 ( 441 )

2016 ( 462 )

Custom range...

Search Results: 1 - 10 of 35407 matches for " Xuezhen Hong "
All listed articles are free for downloading (OA Articles)
Page 1 /35407
Display every page Item
Evaluation Index System of Corporation’s Innovation Capacity and Application Study  [PDF]
Xuezhen Hong, Yingzhong Wang
Technology and Investment (TI) , 2016, DOI: 10.4236/ti.2016.74016
Innovation is the precondition for the sustainable development of corporation, and the purpose of “reform of the supply front” which the government puts forward at present is to improve the innovation capacity of corporation. In this paper, in order to provide reference for improving innovation capacity and seek the factor of improving the innovation capacity, an evaluation index system of corporation’s innovation capacity is established after analyzing the input, profit, steady finance and governance capacity of the corporations which are listed on the Growth Enterprises Market by comparing the score of each corporation’s innovation capacity.
Research and Design on Virtual Experiment System Integration Based on WebService  [PDF]
Xuezhen Niu, Fuan Wen, Yanlian Sun
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.22011

With awareness of information teaching being enhanced, related technology and products on vir- tual experiments have also been continuously developed and improved. However, due to multi-party systems applied result a lack of unity and standardization for experimental teaching processes during the current experimental teaching. This paper purposes integration solutions based on WebService, on the basis of research and analysis of system integrates design, implementation, and virtual experiment platform. The author focuses on realizing integration of Multi virtual experiment teaching resources. Meanwhile through actual trial, results implied that virtual experiment teaching work can be more efficient and normative in university with a standardized process for experiment and management, which can provide a favorable platform basis to achieve resources sharing on virtual experiment in the future.

Response of Simulated Surface Air Temperature to the Interannual Variability of Leaf Area Index in Eastern China
Xuezhen Zhang,Qiuhong Tang
Advances in Meteorology , 2013, DOI: 10.1155/2013/817870
Abstract: Using the coupled WRF-Noah model, we conducted two experiments to investigate impacts of the interannual variability of leaf area index (LAI) on the surface air temperature (SAT) in eastern China. The Moderate Resolution Imaging Spectroradiometer (MODIS) observed dynamic LAI data from 2002 to 2009 were used in one modeling experiment, and the climatological seasonal cycle of the MODIS LAI was used in the other experiment. The results show that the use of dynamic LAI improves model performance. Compared with the use of climatological LAI, the use of dynamic LAI may reduce the warm (cool) bias in the years with large positive (negative) LAI anomalies. The reduction of the warm bias results from the modeled cooling effect of LAI increase through reducing canopy resistance, promoting transpiration, and decreasing sensible heat flux. Conversely, the reduction of cool bias is a result of the warming effect of negative anomaly of LAI. The use of dynamic LAI can improve model performance in summer and to a lesser extent, spring and autumn. Moreover, the dynamic LAI exerts a detectable influence on SAT in the WRF model when the LAI anomaly is at least 20% of the climatological LAI. 1. Introduction A large amount of evidence shows that terrestrial vegetation is an important dynamic component of the climate system [1–4]. Terrestrial vegetation regulates the local/regional weather and climate through modifying the surface energy budget, modifying partition of surface net radiation between latent heat flux and sensible heat flux, modifying surface wind, as reviewed by Notaro et al. [5]. For instance, coupling a dynamic vegetation model could upgrade the ability of the climate model to capture low-frequency variability of precipitation in the Amazon region [6]. The coupled WRF-Noah model could simulate climate warming closer to ground measurements by using a dynamical green vegetation fraction rather than by using a climatological fraction [7]. Therefore, it would be valuable to accurately describe vegetation properties in climate models to improve model performance. In climate models, the land surface submodel is used to simulate the dynamics of moisture and heat within soil and surface heat and moisture fluxes to the atmosphere. The Noah land surface scheme (Noah LSM) is an intermediate-complexity land surface model that can provide reasonable diurnal and seasonal variations of surface heat fluxes [8]. The Noah LSM is employed in the National Centers for Environmental Prediction (NCEP) operational mesoscale Eta model [9], the Mesoscale Model (MM5) [8], the Weather

LIU Xuezhen,

力学与实践 , 2008,
Abstract: Biomechanics in sports applies mechanical concepts and principles to study human body movements. It is important for understanding human body movements, improving sports performance, preventing sports injuries, and helping rehabilitation. This article reviews its history, current research areas, and related studies in China, together with its development in future.
Taylor's Law and the Spatial Distribution of Urban Facilities
Liang Wu,Xuezhen Chen,Chunyan Zhao
Statistics , 2014,
Abstract: Taylor's law is the footprint of ecosystems, which admits a power function relationship $S^{2}=am^{b}$ between the variance $S^{2}$ and mean number $m$ of organisms in an area. We examine the distribution of spatial coordinate data of seven urban facilities (beauty salons, banks, stadiums, schools, pharmacy, convenient stores and restaurants) in 37 major cities in China, and find that Taylor's law is validated among all 7 considered facilities, in the fashion that either all cities are combined together or each city is considered separately. Moreover, we find that the exponent $b$ falls between 1 and 2, which reveals that the distribution of urban facilities resembles that of the organisms in ecosystems. Furthermore, through decomposing the inverse of exponent $b$, we examine two different factors affecting\emph{ }the numbers of facilities in an area of a city respectively, which are the city-specific factor and the facility-specific factor. The city-specific factor reflects the overall density of all the facilities in a city, while the facility-specific factor indicates the overall aggregation level of each type of facility in all the cities. For example, Beijing ranks the first in the overall density, while restaurant tops the overall aggregation level.
Hybrid plant regeneration from interfamilial somatic hybridization between grapevine (vitia vinifera L.) and Red Thorowax (Bupleurum scorzonerifolium willd)
Xiquan Song,Guangmin Xia,Aifen Zhou,Xuezhen Bao,Huimin Chen
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886345
Abstract: The protoplasts of Red Thorowax (Bupleurum scorzonerifolium) irradiated by ultraviolet light (UV) at an intensity of 260 μW/cm2 for 0, 1,2 and 3 min respectively were fused with that of grapevine (Vitia vinifera). The regenerated 19 clones, every one derived from a single fused cell, were identified as hybrids by phenotype, isozyme, chromosome and 5S rDNA spacer region analysis. The results reveal that all of them are somatic hybrids. 11 hybrid calli including asymmetric and symmetric products regenerated somatic embryos and young leaves after 5 months of culture, of which 4 hybrid cell lines derived from asymmetric fusion regenerated plants with roots after 8–10 months of culture. Inspection of chromosome showed that regeneration of whole plant was related to the decrease of chromosome number. Identification of 5S rDNA spacer region of the plants confirmed that they were interfamilial hybrid plants.
Reconstructing temperature change in Central East China during 601–920 AD
QuanSheng Ge,HaoLong Liu,JingYun Zheng,XueZhen Zhang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-4179-z
Abstract: Using historical records on first and last frost and snow, spring cultivation, David peach blossom, autumn crop harvest, grade of sea freeze and change in northern citrus boundary, we reconstructed temperature change during 601–920 AD. The mean temperature of the winter half-year (October to April) over Central East China during this period was about 0.22°C higher than that of the present (1961–2000 AD mean). During 601–820 AD, mean temperature was about 0.52°C higher than the present. During 821–920 AD, the mean temperature was 0.42°C lower than the present. The temperature fluctuations were characterized by a maximum amplitude of 1.05°C at the centennial scale, 1.38°C at the 50–year scale, 2.02°C at the 30-year scale, and 2.3°C at the 20-year scale. There were four peaks warmer than today (601–620 AD, mean of 1°C higher temperature; 641–660 AD, 1.44°C; 701–720 AD, 0.88°C; 781–800 AD, 0.65°C). Three cold periods were in 741–760, 821–840, and 881–900 AD, the mean temperature of which was 0.37–0.87°C lower than the present.
1876–1878 severe drought in North China: Facts, impacts and climatic background
ZhiXin Hao,JingYun Zheng,GuoFeng Wu,XueZhen Zhang,QuanSheng Ge
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3243-z
Abstract: Based on the reconstructed precipitation series in North China from historical documents, the 1876–1878 drought was identified as the most severe and extreme one in North China over the past 300 years. Meanwhile, the spatial patterns of seasonal and annual precipitation during 1876–1877 were analyzed and the social and economic impacts related with this drought event were evaluated according to the descriptions in the historical documents. The results indicated that this long-lasting drought started by the spring of 1876 and did not stop until the spring of 1878. Within the three years, the harvest failures brought the rice price increased to 5–10 times than that in the normal year, and the total population in the five provinces over North China decreased by more than 20 million due to a large number of dead people and migrations. In addition, related investigations suggested that the 1876–1878 drought was prevalent worldwide, which has possible link with abnormal high SST in the equatorial central and eastern Pacific, strong El Ni o episode and positive AAO anomalies.
On stabilization for a class of nonlinear stochastic time-delay systems:a matrix inequality approach

Weihai ZHANG,Xuezhen LIU,Shulan KONG,Qinghua LI,

控制理论与应用 , 2006,
Abstract: This paper treats the feedback stabilization of nonlinear stochastic time-delay systems with state and control-dependent noise. Some locally (globally) robustly stabilizable conditions are given in terms of matrix inequalities that are independent of the delay size. When it is applied to linear stochastic time-delay systems, sufficient conditions for the state-feedback stabilization are presented via linear matrix inequalities. Several previous results are extended to more general systems with both state and control-dependent noise, and easy computation algorithms are also eiven.
Simulated Effects of Cropland Expansion on Summer Climate in Eastern China in the Last Three Centuries
Quansheng Ge,Jingyun Zheng,Xuezhen Zhang,Fanneng He
Advances in Meteorology , 2013, DOI: 10.1155/2013/501014
Abstract: To understand the effects of the land use/cover changes due to agricultural development on summer climate in Eastern China, four 12-year simulations using the WRF-SSiB model were performed. We found that agricultural development resulted in warming and rainy effects. In the middle to lower reaches of the Yellow River and the Yangtze River, the warming effects were approximately 0.6°C and resulted from increased surface net radiation and sensible heat fluxes. In Northeast China, the warming effects were very small due to increases in latent heat fluxes which resulted from the extensive conversion from grassland to cropland. The rainy effect resulted from increases in convective rainfall, which was associated with a warming surface in certain areas of the Yellow River and Yangtze River and a large increase in the surface moisture flux in Northeast China. Conversely, in the middle to lower reaches of the Yellow River and the Yangtze River, the grid-scale rainfall decreased because the climatological northward wind, which is moist and warm, was partially offset by a southward wind anomaly. These findings suggest that the agricultural development left footprints not only on the present climate but also on the historical climate changes before the industrial revolution. 1. Introduction Eastern China is affected by the Asian monsoon [1]. In this area, summer is the warmest and wettest season. The heat and rainfall in summer feed agriculture for human welfare. Therefore, the summer climate has crucial implications to the originations and development of agriculture in East China [2]. The agriculture in Eastern China potentially extends back thousands of years [3]. Agricultural development converts land cover from natural vegetation (e.g., forest, grassland, and wetland) to anthropogenic cropland. Such conversions may lead to changes in surface parameters, including albedo, emissivity, and roughness and therefore may have important climatic implications [4, 5]. As a result, as a by-product of agricultural development, the summer climate might be modified. The current summer climate might therefore include a human dimension. Studying the effects of agricultural development would be valuable for understanding “natural” summer climate to improve our predictability of future scenarios. Many studies attempted to use past history to reveal the effects of human-induced land cover changes (HLCCs) on regional climate [6]. According to the experimental design, these simulation-based studies can be classified into two categories. The first category focused on the climatic
Page 1 /35407
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.