Results 41 to 50 of about 1,637,472 (150)
Jianzhu Gangjiegou Jinzhan, 2016 通过有限元方法研究火灾下无防火保护蜂窝钢梁孔间腹板屈曲性能及屈曲温度。首先采用有限元传热分析,获得标准火灾下无防火保护蜂窝梁不同受火时刻的三维有限元温度分析结果,然后采用有限元受力分析确定三维有限元温度分析结果下蜂窝梁孔间腹板的受力性能和屈曲温度。传热分布结果表明,开孔后增加了孔洞周边厚度方向上腹板与空气间的热量交换,使得腹板升温速率明显大于翼缘。火灾下结构受力分析结果表明,由于钢材的力学性能随温度升高而降低,而且中心腹板升温速率快使蜂窝梁更易发生孔间腹板屈曲破坏 ...
李鹤, 王旭东, 张露露, 刘梅
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The pre‐existing α‐Fe crystals have important effects on the precipitation and growth of nanocrystals and finally determine the comprehensive soft magnetic properties (SMPs) of the nanocrystalline alloys (NAs). In this work, a high content of Cu elements has been added to Nanomet‐type alloys to enhance the gradient heterogeneity in order to ...
Lei Xie +6 more
wiley +1 more source
Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Integrative Conservation, Volume 5, Issue 1, Page 86-103, March 2026.Urbanization may alter bird foraging. Austral Parakeets (Enicognathus ferrugineus) in Patagonia rely on introduced plants in urban areas, especially in winter, despite preferring natives in the wild. This seasonal reliance on introduced species highlights urbanization trade‐offs and underscores the need to manage green areas with native plants to ...
Rocío Bahía +2 more
wiley +1 more source
, 2016 本论文基于中心集气管对油页岩外热式固定床热解过程的强化，深入研究了反应器内温度分布对热解产物分布和产品特性的影响。采用了单段固定床反应装置、温度梯度热解装置和两段反应装置分别研究了桦甸油页岩的基本热解特性、反应器内温度分布对热解过程的影响和温度分布影响热解的机理。油页岩在500-700 oC温度范围内的固定床程序升温热解实验表明，油收率在550 oC达到最大值7.91%，约为铝甑油收率的86.07%。在油页岩梯度热实验中，当热解温度分布为900-500 oC时页岩油收率为7.40 ...
张喻
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Integrative Conservation, Volume 5, Issue 1, Page 74-85, March 2026.This study investigates distribution patterns of Galliforms in the Indian Himalayas, focusing on factors influencing their occurrence, regions of high diversity and endemism, and their overlap with protected areas. Our study highlights the need for assemblage‐level conservation strategies in high Himalaya which primarily relies on snow leopard‐focused ...
Manvi Sharma +5 more
wiley +1 more source
, 2015 为了深入研究吸附式空分制氧过程的温度分布,采用二维数值模型对吸附床的温度分布进行模拟分析。结果表明,在循环稳定时床内温度波动约10℃,并且温度变化主要发生在升压和降压阶段;在分离过程中氮气的吸附量远远大于氧气的吸附量,所以吸附热主要是由氮气的吸附引起的,因此温度的分布云图非常类似于氮气吸附量的分布;在本研究中壁面换热对床内温度和浓度分布的影响较小 ...
郑新港, 鲍化坤
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, 2000 介绍了一套用于燃烧研究中对温度和成分浓度测量进行校准的氢／空气预混平面火焰燃烧４系统。采用氮ＣＡＲＳ技术对氢／空气预混平面火焰温度进行了系统的测量，包括不同当量比条件下的温度分布，温度的纵向和横向空间分布。结果表明，氮ＣＡＲＳ测温与氢／空气预混平面火焰的理论计算温度之间的误差为３.４％，而在燃烧炉表面上方１ｍｍ以上的空间属于火焰的温度均匀区，温度的不均匀性约为１.８％
赵建荣, 俞刚, 杨仕润, 韩百
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Gaoya dianqi, 2017 自愈式电容器具有无油、低噪声和储能密度高等优点,尤其适合于城市和清洁能源应用场合。为了获得自愈式电容器在运行情况下的温度场分布,在Fluent 15.0中建立了自愈式电力电容器承受400 V交流电压,环境温度为55°C情况下的温度场计算模型;采用有限体积法计算获得了其外壳和内部心子等的温度场分布并对计算结果进行了系统分析。计算结果表明:外壳最高温度在大侧面,大侧面温度高于小侧面。外壳和心子的平均温升分别为3°C和5°C左右,心子温度比外壳温度高23°C。分析了元件直径 ...
何慧雯 +6 more
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毛苔草、漂筏苔草沼泽地与大豆地近地层晴夜气温和相对湿度分布及对比研究
, 2010 采用野外定位观测方法,在2008年6～9月期间选取16个晴夜,在三江平原典型毛苔草、漂筏苔草(Ass.Carex pseudocuraica-Carex lasiocarpa)沼泽地及其邻近大豆地中,在距地表0.5m、1.5m、3m和5m四个高度上进行了气温和相对湿度观测;根据实测数据,分析了沼泽地和大豆地各高度夜间气温和相对湿度的分布规律及其差异。研究结果显示,晴夜,沼泽地和大豆地近地层气温的垂直分布都为逆温分布,与之相对应,二者的相对湿度垂直分布都为湿型分布 ...
刘兆礼 +4 more
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