Results 21 to 30 of about 11,289 (219)
Scale dependency of conservation outcomes in a forest‐offsetting scheme
Conservation Biology, Volume 34, Issue 1, Page 148-157, February 2020., 2020 Abstract Offset schemes help avoid or revert habitat loss through protection of existing habitat (avoided deforestation), through the restoration of degraded areas (natural regrowth), or both. The spatial scale of an offset scheme may influence which of these 2 outcomes is favored and is an important aspect of the scheme's design.
Marta Lisli Giannichi +4 more
wiley +1 more source
工程建设, 2020 作者结合自身工作经验，对格构梁联合锚杆在顺层岩质边坡加固中的受力机理进行数值模拟分析，借助专业有限元软件ANSYS来实施建模分析工作，针对锚杆以及相关附属结构的稳定性实施综合分析，针对分析结果我们总结出：将格构梁联合锚杆结构进行合理的设置，不但可以提升施工工作的安全性，并且能够有效的对周边岩体结构稳定性加以提升，为后续的施工工作的顺利开展创造良好的基础。
敏 周
semanticscholar +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 准确模拟建筑物地震倒塌可为分析建筑废墟存活空间分布规律和构建救援生命通道提供重要的前期基础。以钢框架结构为研究对象，重点讨论钢框架、填充墙、填充墙与钢框架之间连接问题。采用有限单元法（FEM）和有限-离散单元法（F-DEM）相结合的方法模拟了2跨×3跨的3层钢框架填充墙结构，以倒塌模式为评价指标来验证数值模拟方法的准确性。结果表明：数值模型整体结构表现为倾斜式倒塌模式，朝大跨度方向倒塌并伴随扭转，与实际震害中外廊式结构的倒塌模式相一致；向着结构大跨度方向的存活空间逐渐减小 ...
裴学良 +4 more
doaj
Jianzhu Gangjiegou Jinzhan, 2021 为了研究复杂钢管空间节点的应力集中系数,采用有限元软件ANSYS建立了复杂钢管空间节点有限元模型。有限元模型考虑了焊缝的影响,将有限元计算结果与试验结果进行比较,二者吻合较好,从而验证了有限元模型的可靠性。对复杂钢管空间节点模型进行了参数分析,研究了各个参数对节点应力集中系数的影响。参数分析结果表明,主管径厚比γ对节点应力集中系数的影响较大;其他参数对节点应力集中系数的影响较小。对252个参数分析模型的结果进行回归分析,建立了节点各部分应力集中系数的拟合公式。拟合公式计算值与有限元计算值吻合较好 ...
梁佳俊 +3 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2016 在三值FPRM（Fixed-Polarity Reed-Muller）逻辑函数中，n变量函数有3n个固定极性.针对不同极性下FPRM电路功耗不同的特点，研究了三值FPRM逻辑表达式，提出一种基于模拟退火遗传算法的三值FPRM电路功耗优化方法.首先，根据三值逻辑函数表达式和开关信号传递理论，建立三值FPRM电路功耗估计模型；再利用模拟退火遗传算法对三值FPRM电路进行功耗最佳极性搜索，得到了功耗最低的FPRM电路；最后对13个MCNC Benchmark电路进行仿真.结果表明：与0极性相比 ...
LIKangping(厉康平) +2 more
doaj +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue +5 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 二维瞬态传热模型仅对构件横截面内两个维度的高温传热进行模拟，若需考虑轻钢组合构件纵向各横截面间的传热影响，需建立三维数值传热模型。建立了轻钢组合构件三维传热有限元精细模型，考虑了空腔热传导、热对流和热辐射作用及构件纵向传热的影响，数值模拟结果与试验结果吻合良好，并在此基础上对组合构件的纵向传热进行了研究。为节省三维传热模拟的计算时间，提出利用热传导作用等效空腔对流作用的简化处理方法，并将二维等效简化方法及所推导的等效导热系数用于三维等效简化模型的建立。将模拟结果与试验结果进行对比 ...
叶继红, 徐焱
doaj
测绘与勘探, 2020 以淮南矿区部署采动区煤层气地面井的工作面为原型，利用 FLAC3D 模拟分析了采动过程中的工作面平面岩层移动变化规律，阐明了不同条件下岩层位移对井孔失稳的影响。
洁 韩
semanticscholar +1 more source
Simulating the efficacy of wolf–dog hybridization management with individual‐based modeling
Conservation Biology, Volume 39, Issue 1, February 2025.In the photo, an introgressed adult wolf–dog in the Northern Apennines, Italy, not far from the city of Bologna. Part of a research program, this male has been sterilized and released back in its own pack with a Global Positioning Collar. Abstract Introgressive hybridization between wolves and dogs is a conservation concern due to its potentially ...
Nina Luisa Santostasi +4 more
wiley +1 more source
Methods in Ecology and Evolution, Volume 10, Issue 9, Page 1412-1430, September 2019., 2019 Abstract Proportional data, in which response variables are expressed as percentages or fractions of a whole, are analysed in many subfields of ecology and evolution. The scale‐independence of proportions makes them appropriate to analyse many biological phenomena, but statistical analyses are not straightforward, since proportions can only take values
Jacob C. Douma +2 more
wiley +1 more source