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面向自组织人群的建筑安全评估算法

浙江大学学报（工学版） 2024年第9期58卷 1844-1856页

作者：武慧何高奇李晨王长波华东师范大学计算机科学与技术学院上海200062

为了解决室内建筑节点不合理与人群逃生路线选择困难的问题,提出面向自组织人群的建筑安全评估算法.基于IndoorGML建立室内空间的水平平面结构和垂直层级结构,形成拓扑空间中的节点关联图,以表示多层建筑物的空间结构.通过对单元空间的... 详细信息

为了解决室内建筑节点不合理与人群逃生路线选择困难的问题,提出面向自组织人群的建筑安全评估算法.基于IndoorGML建立室内空间的水平平面结构和垂直层级结构,形成拓扑空间中的节点关联图,以表示多层建筑物的空间结构.通过对单元空间的风险、通行率的定义,设计基于A^(*)算法的安全疏散路线选择算法.通过分析逃生路线的选择人数、单条逃生路线上节点的最高风险、单条逃生路线的平均逃生时间,找出室内建筑不合理节点并提出优化方案.构建模拟场景进行仿真实验,对比不同路线选择方法的结果,分析并验证所提评估算法的有效性.结果表明,所提出的方法能够找出建筑拥堵的主要因素及其对疏散的影响程度,有助于在建筑设计阶段开展科学的建筑安全评估.

关键词：人群仿真建筑安全评估 Indoor GML 自组织人群安全疏散路线选择

Cost of non-renewable energy in production of wood pellets in China

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Frontiers of Earth Science 2013年第2期7卷 199-205页

作者： changbo wang Lixiao ZHANG Jie LIU State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Transport Planning and Research Institute Ministry of Transport Beijing 100028 China

Assessing the extent to which all bio-fuels that are claimed to be renewable are in fact renewable is essential because producing such renewable fuels itself requires some amount of non-renewable energy （NE） and materials. Using hybrid life cycle analysis （LCA）--from raw material collection to delivery of pellets to end users--the energy cost of wood pellet production in China was estimated at 1.35 J/J, of which only 0.09 J was derived from NE, indicating that only 0.09 J of NE is required to deliver 1 J of renewable energy into society and showing that the process is truly renewable. Most of the NE was consumed during the conversion process （46.21%） and delivery of pellets to end users （40.69%）, during which electricity and diesel are the two major forms of NE used, respectively. Sensitivity analysis showed that the distance over which the pellets are transported affects the cost of NE significantly. Therefore the location of the terminal market and the site where wood resources are available are crucial to saving diesel.

关键词： wood pellet non-renewable energy (NE) hybrid life cycle analysis (LCA) bio-fuel

Simulation of free-surface flow using a boundless grid

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Science China(Information Sciences) 2013年第3期56卷 38-47页

作者： wang changbo ZHANG Qiang KONG FanLong Software Engineering Institute East China Normal University Shanghai Key Laboratory of Trustworthy Computing East China Normal University

Physically based fluid simulation in recent years has been successful for small-scale fluids such as liquid in a cubic ***,for boundless free-surface flow of large scale and irregular area,there is a critical trade-off between simulation efficiency and accuracy because of the restriction of the traditional regular computational *** paper introduces boundless computational grids based on hierarchical runlength encoding to simulate large-scale free-surface *** first modeled the free-surface flow with a lattice Boltzmann method,and calculated the surface curvature in the update *** then introduced an effective method with which to calculate the surface curvature according to the surface tension so that the surface detail was enhanced,and obtained the curvature of each surface effectively as it was ***,we dynamically compressed and indexed the computational cells with the improved hierarchical run-length encoding algorithm,so that the grid expands dynamically according to the fluid flow and the computational resources used were proportional to the volume of the *** fluids in different situations were simulated *** proposed method makes the best of the computational resources to perform the simulation with high resolution,and dynamically allocates resources so that the fluid can expand in random directions without boundaries,which is suited to the simulation of large-scale visual scenes.

关键词： fluid simulation free surface boundless grid hierarchical run-length encoding computing resource

Seasonal Changes of Reproductive Activity and Biochemical Composition of Pen Shell Atrina pectinata Linnaeus,1767 in Bohai Sea,China

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Journal of Ocean University of China 2017年第3期16卷 479-489页

作者： wang changbo LI Qi XU Chengxun YU Ruihai Key Laboratory oJMariculture of Ministry of Education Ocean University of China Qingdao 266003 P. R. China

Seasonal variations in the biochemical composition and the reproductive cycle of pen shell Atrina pectinata in Bohai Sea were investigated from May 2013 to April 2014. Histological analysis indicated that the reproductive cycle of A. pectinata can be divided into two phases, inactive stage and gametogenesis, which were equally and significantly influenced by seawater temperature and food availability. Gametogenesis began in late autumn(October), and completed in June and July. Spawning took place in August, coinciding with the highest water temperature and the richest phytoplankton. The significantly high glycogen content in adductor muscles sustained throughout the late active and ripeness stages, but plummeted during spawning and inactive stages. The protein content in female gonads exhibited a synchronous increase along with oocyte diameter and lipid content, suggesting that the female gonads could accumulate protein and lipid for vitelline in A. pectinata. Furthermore, the RNA/DNA ratio was found to be a useful index to indicate the level of gonad maturation in both males and females. The findings of the present study provided a foundation for the fishery resource administration and the aquaculture development of this species.

关键词： biochemical composition reproductive cycle environment factor Atrina pectinata seasonal variation

汽油机EGR用超纯铁素体J444E不锈钢高温性能研究

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甘肃冶金 2024年第3期46卷 97-101页

作者：李玉峰王长波潘吉祥靳塞特甘肃酒钢集团宏兴钢铁股份有限公司钢铁研究院甘肃嘉峪关735100

根据汽油机EGR冷却器工况特性和对材料的要求,开发出适应复杂环境下性能优良、成本低廉的超纯铁素体不锈钢材料J444E钢。通过对200~630℃、900~1050℃中高温力学性能及900~1050℃不同温度下100~500 h不同时间及900℃钎焊前后高温氧化性... 详细信息

根据汽油机EGR冷却器工况特性和对材料的要求,开发出适应复杂环境下性能优良、成本低廉的超纯铁素体不锈钢材料J444E钢。通过对200~630℃、900~1050℃中高温力学性能及900~1050℃不同温度下100~500 h不同时间及900℃钎焊前后高温氧化性能和氧化层的试验研究和分析,表明该材料在工况环境下具有良好的力学和抗氧化性能。

关键词： EGR冷却器 J444E钢高温力学性能高温氧化性能

Enhancing the green efficiency of fundamental sectors in China’s industrial system:A spatial-temporal analysis

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Journal of Management Science and Engineering 2021年第4期6卷 393-412页

作者： Jiangxue Zhang Xu Liu Xue Zhang Yuan Chang changbo wang Lixiao Zhang School of Economics and Resource Management Beijing Key Lab of SCI-TECH Strategy for Urban Green DevelopmentBeijing Normal UniversityBeijing100875China School of Business Harbin University of CommerceHarbin150028China School of Management Science and Engineering Central University of Finance and EconomicsBeijing100081China College of Economics and Management&Research Center for Soft Energy Science Nanjing University of Aeronautics and AstronauticsNanjing210016China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China

Due to sectoral interactions in the economy,the overall green efficiency(GE)of China’s industrial system relies heavily on fundamental sectors that contribute substantial energy to the supply chain production of other sectors but shows low sectoral *** the three fundamental sectors in China’s industrial systems,namely the smelting and pressing of nonferrous metals(SPNFM),the processing of petroleum,coking,and nuclear fuel(PPCNF);and the manufacturing of nonmetallic mineral products(MNMMP),we employed a three-stage data envelopment analysis(DEA)model to measure GE in the fundamental sectors in 30 provinces from 2010 to *** then adopted a stochastic frontier analysis(SFA)model to evaluate the influence of technological innovation(TI),industrial agglomeration(IA),environmental regulation(ER),and intraindustry competition(IC).The results showed that GE in the three fundamental sectors varied ***,TI promoted GE in MNMMP,but the effect was not obvious in the SPNFM and PPCNF ***,ER had positive impacts on GE in the fundamental *** effects of IA and IC on GE in the fundamental sectors varied in direction and *** eliminating the impacts of environmental effects and statistical noise,the real GE in the three fundamental sectors varied significantly compared to the comprehensive *** opportunities for enhancing GE in the fundamental sectors mainly lie in region-specific policy and regulations that avoid a“one-size-fits-all”governance approach.

关键词： Fundamental sectors Green efficiency Three-stage DEA Spatial differences

Simulation of nuclear isomer production in laser-induced plasma

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Matter and Radiation at Extremes 2024年第5期9卷 1-9页

作者： Zhiguo Ma Yumiao wang Yi Yang Youjing wang Kai Zhao Yixin Li changbo Fu Wanbing He Yugang Ma Key Laboratory of Nuclear Physics and Ion-Beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China

Nuclear isomers play essential roles in various fields,including stellar nucleosynthesis,nuclear clocks,nuclear batteries,clean nuclear energy,and-ray *** technological advances in high-intensity lasers have made it possible to excite or de-excite nuclear isomers using table-top laser *** a particle-in-cell code,we investigate the interaction of a laser with a nanowire array and calculate the production rates of the^(73m)Ge(E_(1)=13.3 keV)and^(107m)Ag(E_(1)=93.1 keV)***^(73m1)Ge,production by Coulomb excitation is found to contribute a peak efficiency of 1.0×10^(19) particles s^(−1)J^(−1),while nuclear excitation by electron capture(NEEC)contributes a peak of 1.65×10^(11)particles s^(−1)J^(−1).These results indicate a high isomeric production ratio,as well as demonstrating the potential for confirming the existence of NEEC,a long-expected but so far experimentally unobserved fundamental process.

关键词： process. isomers excitation

A Beautiful China Initiative Towards the Harmony between Humanity and the Nature

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Frontiers of Environmental Science & Engineering 2024年第6期18卷 33-41页

作者： changbo Qin Qiang Xue Jiawei Zhang Lu Lu Shangao Xiong Yang Xiao Xiaojing Zhang Jinnan wang Institute of Strategic Planning Chinese Academy of Environmental PlanningBeijing 100041China The Center for Beautiful China Chinese Academy of Environmental PlanningBeijing 100041China Chinese Academy of Environmental Planning Beijing 100041China

The Beautiful China Initiative(BCI)is a vivid embodiment of the harmonious coexistence between humans and nature during *** the BCI is an effective method for achieving the goals of building a beautiful China,while offering a“Chinese solution”to global sustainable *** article summarizes the progress and main experiences of the BCI,as well as analyzing the primary challenges facing its future ***,five policy recommendations are proposed,which emphasize the importance of top-level design,coordinated planning,and a robust support system in the implementation of the BCI.

关键词： Beautiful China Initiative Ecological civilization Practice Policy suggestion

Physically based simulation of Buddha Glory

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Progress in Natural Science:Materials International 2006年第6期16卷 656-662页

作者： LIU Shiguang, wang Zhangye, GONG Zheng, wang changbo and PENG Qunsheng (State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou 310027, China Department of Mathematics, Zhejiang University, Hangzhou 310027, China Department of Structure Engineering, Tongji University, Shanghai 200092, China) State Key Laboratory of CAD and CG Zhejiang University Hangzhou 310027 China Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Structure Engineering Tongji University Shanghai 200092 China

This paper proposes a novel method of photorealistic simulation of Buddha Glory, a natural phenomenon of great visual beauty which can be observed in the area of famous Buddhism Holy Lands in China. This phenomenon is mainly caused by back-scattering of water droplets in fog or cloud. To simulate the glory, we first calculate the spectral scatter intensity of glory rings using Mie scattering theory. We then present a new shadow model to determine the deformed shape of the head and body of "Buddha" within the glory ring. The affect of atmospheric parameters such as the solar elevation angles, the density and size of water droplet in fog or cloud on the shape and color of Buddha Glory is also calculated. For rendering, we adopt the method of path scattering integral to generate the whole attenuated scene of Buddha Glory. Compared with the photographs of real Buddha Glory displays, our synthetic results are quite satisfactory.

关键词： natural phenomenon Buddha Glory back-scattering physically based simulation.