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| 1 | Research on Methods of Ecological Security Assessment of the Middle and Lower Reaches of Liaohe River Based on GIS显示文摘Ecological security assessment and early warning research possess the attributes of spatiality, non-linearity and randomicity, so we must process much spatial information. Spatial analysis and data management are the advantages of GIS, which can define distribution trend and spatial relations of environmental factors, and show ecological security pattern graphically. Spatial differences of ecological security assessment based on GIS are discussed in this paper, of which the middle and lower reaches of the Liaohe River is taken as a study case. First, to work out pressure-state-response (P-S-R) assessment indicators system, and investigate in person and gather information; second, to digitize the watershed; third, to quantize and calculate by the fuzzy method; last, to construct GIS grid database, and expound spatial differences of ecological security by GIS interpolation and assembly analysis. | Wang Geng 1,2 , Nie Baochi 3, Wang Lin 1 & Wu Wei 1 1. School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China 2. Urban and Environmental School, Liaoning Normal University, Dalian 116029, China 3. Shenyang Buraue of Water Resources, Shenyang 110013, China. | 2005 | Chinese Journal of Population,Resources and Environment2005，3，4： | 12 |
| 2 | Simulated Annealing for Earliness/Tardiness Production Planning Model | LI Ying\|juan\+1,\ WANG Ding\|wei\+2 1. Department of Industry and Business Administration, Shenyang University Shenyang 110013,China 2. Department of Systems Engineering, College of Information Science and Engineering,Northeastern University,Shenyan | 2000 | Systems Science and Systems Engineering2000，10，1： | 1 |
| 3 | Static mechanics analysis of no bumping or vibration welding structure applied in high-speed & heavy-load CWR with single inclined surface显示文摘Nowadays, the sleeper, railroad bed, welding technology and materials of the high-speed & heavy-load Continuous Welded Rail (CWR) have been improved greatly. However, the orientation relationship between welding surface and rail is still orientation structure, which appeared 185 years ago in UK, namely, the welding surface is normal to the longitudinal direction of the rail. Thus rail welds are subject to vertical pure shear stress, lateral pure shear stress and axial pure tensile stress. Pure shear stress and pure tensile stress are both dangerous stresses, which result in failure of welds under high-speed & heavy-load condition for a long time. When the wheels pass rail welds, it is difficult to avoid vertical bumping and lateral vibration. In order to solve these problems, in this paper we put forward the single inclined welding surface having dip angle α with the lateral rail or dip angle β with the vertical rail and analyze the position geometry and stress state. Thus the vertical bumping and lateral vibration are basically eliminated, then the bearing capacity of the welding surface is significantly improved, and the stress of axial pure tensile and lateral pure shear of the welding surface is reduced. | SONG YuQuan1, LUO WuWei2 & TAO Yi2 1 Jilin University, Changchun 130022, China 2 Shenyang Railway Bureau, Shenyang 110013, China | 2010 | Science China(Technological Sciences)2010，53，12： | 1 |
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