Results 21 to 30 of about 14,981 (164)
Dianci bileiqi, 2015 根据1 100 kV瓷套型避雷器机械性能要求,从力学分析角度,建立瓷套型避雷器的静力学和动力学分析模型,采用有限元法进行静力弯曲试验和动力学仿真分析。静力学、动力学仿真计算数据与产品试验数据的对比研究表明:静力学、动力学仿真计算建模及计算方法准确;1 100 kV瓷套型避雷器设计满足工程需求。
刘朝丰 +5 more
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Shuitu Baochi Xuebao, 2023 针对泥石流流变特性和动力学过程复杂的特点,在系统收集国内泥石流数值模拟研究相关文献的基础上,按初步探索、逐渐完善和成熟多元3个阶段对我国泥石流数值模拟研究的历程及现状进行了总结。根据物质组成和动力学特征来看,泥石流的动力学模型可划分为连续介质、离散介质和混合介质模型,通过分析不同模型的特点及应用场景,对比总结各类模型和数值计算方法的适用性及不足,在此基础上针对当前泥石流模拟存在的难点,对泥石流数值模拟的发展进行了展望,旨在为泥石流数值模拟研究及应用软件开发提供参考。
杨昶, 铁永波, 张宪政, 向炳霖
doaj
Preparation and Application of Biochar-Chitosan Magnetic Composite Adsorbent for Removal of Lead and Copper from Groundwater [PDF]
, 2023 BACKGROUNDWastewater containing heavy metals produced by mining, beneficiation, smelting, forging, processing, transportation, and other industries that has been improperly disposed of, leads to heavy metals entering and polluting the groundwater ...
Hailong CAO +6 more
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Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, EarlyView.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2010 目的建立形态、病理、行为表现及血流动力学特点都更加逼真的动脉瘤动物模型,并应用彩色多普勒对动脉瘤模型进行评价。方法采用新西兰大白兔16只,应用显微缝合法制作侧方动脉瘤模型8只,顶端动脉瘤模型8只。分别于动脉瘤建立后即刻和2周测量动脉瘤的直径,并于2周后行彩色多普勒测定载瘤动脉及动脉瘤内血流速度。结果共制作侧方动脉瘤模型8个,顶端动脉瘤模型8个,其中顶端动脉瘤模型有1枚动脉瘤模型建立术后24小时破裂,1枚动脉瘤术后2周破裂。2周后行彩色多普勒检查发现载瘤动脉血流速度较动脉瘤内血流速度快 ...
李淼 +8 more
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Study of NPZD Ecosystem Dynamical Model Application in Beibu Gulf [PDF]
, 2016 北部湾是我国重要的海湾和渔场，被誉为我国“最后的洁净”，近年来在我国沿海经济发展的成就和潜力倍受关注，然而工业化、城镇化进程的持续加快，也给北部湾的生态环境带来了巨大压力。鉴于此，研究北部湾生态系统的时空分布特征及其对动力环境变化的响应过程具有重要意义，可为我国北部湾生态环境保护建设、资源管理开发和经济发展策略制定等提供科学参考依据。 本文在已建立的“北部湾三维水动力—NPZD生态耦合模型”的基础上进行了进一步的拓展和应用研究，结合历年观测数据、卫星遥感数据和数值模型结果 ...
郑艺妃
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Drivers of bat researchers’ intent to adopt field hygiene practices
Conservation Biology, EarlyView.Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman +6 more
wiley +1 more source
Gaoya dianqi, 2005 总结和比较了当前主要的几种等离子体微观模型: Potapov模型、Eindhoven模型、基于动力学的模型和基于最小吉布斯自由焓原理的模型。前两种模型的理论依据都是道尔顿分压定律、质量作用定律、电荷准中性条件与化学计量平衡条件,但质量作用定律和配分函数的表达式不同:后两种一个是从化学反应动力学的角度,一个是从热力学和统计物理的基本定义出发,来描述等离子体的微观过程。分平衡态和非平衡态阐述了模型的变化:推荐了Eindhoven模型作为工程计算用的首选模型。
臧春艳, 何俊佳, 程礼椿
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On the aerodynamic model and the linear motion characteristics of the airship [PDF]
, 2015 本文以飞艇为研究对象，在完成飞艇动力学建模过程中，除了考虑重力、 浮力、推力对飞艇的作用外，重点分析了俄罗斯、美国以及加拿大体系下的气 动力模型，比较了不同气动力结果的差异，进而讨论不同气动力成份对飞艇动 态特性的影响。所进行的研究工作主要包括以下几个方面： （1）飞艇动力学模型的建立。本文基于空间运动的坐标系、坐标变换矩阵 以及运动参数，推导了飞艇运动学方程和动力学方程，对飞艇受到的重力、浮 力、推力等进行了分析和建模。 （2）分析比较俄罗斯、美国、加拿大学者所采用的气动力估算方法。以 ...
刘玲
core
Regulatory compliance and support for altered management of the exotic pet trade
Conservation Biology, EarlyView.Abstract Globally, the exotic pet trade has contributed to species invasion, disease, and animal welfare risks. Although scientists have advocated for increased trade regulation, the success of management and regulatory efforts depends on compliance by participants in the exotic pet trade. We used a regulatory compliance framework to investigate exotic
Elizabeth N. Pratt +3 more
wiley +1 more source