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| 1 | The effect of environmental factors on spatial variability in land use change in the high-sediment region of China's Loess Plateau显示文摘In areas with topographic heterogeneity, land use change is spatially variable and influenced by climate, soil properties, and topography. To better understand this variability in the high-sediment region of the Loess Plateau in which soil loss is most severe and sediment diameter is larger than in other regions of the plateau, this study builds some indicators to identify the characteristics of land use change and then analyze the spatial variability as it is affected by climate, soil property, and topography. We build two indicators, a land use change intensity index and a vegetation change index, to characterize the intensity of land use change, and the degree of vegetation restoration, respectively. Based on a subsection mean method, the two indicators are then used to assess the spatial variability of land use change affected by climatic, edaphic, and topographic elements. The results indicate that: 1) Land use changed significantly in the period 1998–2010. The total area experiencing land use change was 42,302 km2, accounting for 22.57%of the study area. High-coverage grassland, other woodland, and forest increased significantly, while low-coverage grassland and farmland decreased in 2010 compared with 1998. 2) Land use change occurred primarily west of the Yellow River, between 35 and 38 degrees north latitude. The four transformation types, including(a) low-coverage grassland to medium-coverage grassland,(b) medium-coverage grassland to high-coverage grassland,(c) farmland to other woodland, and(d) farmland to medium-coverage grassland, were the primary types of land use change, together constituting 60% of the area experiencing land use change. 3) The spatial variability of land use change was significantly affected by properties of dryness/wetness, soil conditions and slope gradient. In general, land use changed dramatically in semi-arid regions, remained relativelystable in arid regions, changed significantly in clay-rich soil, remained relatively stable in clay-poor soil, changed dramatically in steeper slopes, and remained relatively stable in tablelands and low-lying regions. The increase in vegetation coincided with increasing changes in land use for each physical element. These findings allow for an evaluation of the effect of the Grain to Green Program, and are applicable to the design of soil and water conservation projects on the Loess Plateau of China. | LUO Ya YANG Shengtian ZHAO Changsen LIU Xiaoyan LIU Changming WU Linna ZHAQ Haigen ZHANG Yichi | 2014 | Journal of Geographical Sciences2014，24，5： | 5 |
| 2 | Comprehensive analysis of changes to catchment slope properties in the high-sediment region of the Loess Plateau, 1978-2010显示文摘To control soil erosion and restore the degraded environment in the Loess Plateau, a large number of measures related to soil and water conservation have been employed that have profoundly affected catchment properties. This study constructed three indicators to characterize changes to the catchment slope, proposed both a method for a regression analysis of adjacent images and a sequence model, and applied multisource remotely sensed images and GIS spatial clustering analysis technologies to extract thematic information and comprehensively analyze the catchment change characteristics. The results indicate that the catchment slope properties changed significantly. At catchment scale, the average values of ARC, DVC and ART were 6.43%, 25.57% and 4.30%, respectively. There were six clustering types of catchment slope property changes. The maximum and minimum of the average similarities of the clustering types were 0.992 and 0.935. Each slope control measures had a distinct effect on catchment slope; the dominating factor of each clustering type was identified as: Type 1: D-VC, Type 2: D-VCLU, Type 3: D-LUVC, Type 4: D-TAVC, Type 5: D-TAC and Type 6: D-MFC. Type 5 and Type 1 covered the largest areas, respectively occupying 37.28% and 31.01%. Catchment slope property changes also had distinct types that depended on their geomorphological conditions. These findings provide a useful basis from which to further study catchment slope hydrological and soil erosion processes. | ZHOU Xu YANG Shengtian LIU Xiaoyan LIU Changming ZHAO Changsen ZHAO Haige ZHOU Qiuwen WANG Zhiwei | 2015 | Journal of Geographical Sciences2015，25，4： | 2 |
| 3 | A soil erosion assessment of the upper Mekong River inYunnan Province, China 显示文摘 | Zhou Qiuwen Yang Shengtian Zhao Changsen | 2014 | Mountain Research andDevelopment2014，34，1： | 1 |
| 4 | An in- stream ecological flow method for data-scarce regulat- ed rivers 显示文摘 | Liu Changming Zhao Changsen Xia Jun | 2011 | Journal of Hydrology2011，398，12： | 1 |
| 5 | Security and Privacy in 5G Internet of Vehicles(IoV)Environment显示文摘Modern vehicles are equipped with sensors,communication,and computation units that make them capable of providing monitoring services and analysis of real-time traffic information to improve road safety.The main aim of communication in vehicular networks is to achieve an autonomous driving environment that is accident-free alongside increasing road use quality.However,the demanding specifications such as high data rate,low latency,and high reliability in vehicular networks make 5G an emerging solution for addressing the current vehicular network challenges.In the 5G IoV environment,various technologies and models are deployed,making the environment open to attacks such as Sybil,Denial of Service(DoS)and jamming.This paper presents the security and privacy challenges in an IoV 5G environment.Different categories of vehicular network attacks and possible solutions are presented from the technical point of view. | Benjamin Kwapong Osibo Chengbo Zhang Changsen Xia Guanzhe Zhao Zilong Jin | 2021 | Journal on Internet of Things2021，3，2： | 0 |
| 6 | High J_c Y-Ba-Cu-O Superconductor Tape显示文摘In Dec.5,1988,we successfully developedsome high Jc Y-Ba-Cu-O superconductortape on a nickel substrate by means of powderrolling.The tape is 0.94mm2 in cross-sectionand its critical current is 21.0A at 77K and inzero applied field.X-ray diffraction analysis indicated thatthe composite tape2 which is made by rollingYBa2Cu3O7-x superconductor powder evenlyon Ni substrate,is found to have someYBa2CU3O7-x tetragonal phase which will | Zhao, Changsen Huang, Yibing Zhu, Xinkun Deng, Fengxiang | 1989 | Rare Metals1989，9，2： | 0 |
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