Results 21 to 30 of about 35,610 (162)
Kongjian kexue xuebao为揭示微重力条件下PCM液桥相变过程流动特征及相变演化规律, 建立PCM液桥数理模型, 采用数值模拟的方法系统研究了不同工况下PCM液桥相变过程中固液界面的演化过程, 分析不同高径比和温差对液桥形状、固液界面演化规律、相变速度和热毛细流动的影响. 研究结果表明, 在大温差条件下热毛细流动更加强烈, 处于外部壁面处的相变材料的相变速度也会更快, 外壁处的相变界面与壁面的夹角会更小. 大的高径比条件下会有同样的效果, 同时也会产生更多的涡胞结构, 热毛细对流效果更明显.
张 永春 +6 more
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Gaoya dianqi, 2022 由于地磁暴在大地产生感应电流以及直流输电系统单极性运行方式与大地形成回路，使得直流电流进入变压器中性点，造成变压器直流偏磁，电流发生畸变，产生谐波。文中在已经研究过的单相特高压变压器直流偏磁计算的基础之上，以230 kV三相五柱式变压器为例，依据单相变压器和三相变压器电路、磁场的区别，利用变压器磁场模型与电路模型建立微分方程，对三相变压器的直流偏磁进行了计算分析。为使计算结果能够快速稳定，在电路中人为串联大电阻，并在计算完成后使用电压补偿的方法将串联电阻所分电压补偿在电路中，根据计算结果可知 ...
王泽忠, 郭苏鑫, 李冰, 张廉杰
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Dizhen xuebao, 2020 在合成孔径雷达干涉测量中，干涉相干是局部干涉条纹质量的重要评价标准，但是由于各种失相干源的影响，会出现失相干现象，而这可能会丢失重要的形变数据。本文首先利用ENVISAT ASAR的两景影像获得了2009年意大利拉奎拉MW6.3地震的带有失相干现象的同震形变场，对数据预处理后再使用移动窗口克里金法对拉奎拉地震的同震形变场进行插值处理，恢复了形变图的失相干区域，之后进一步通过正反演获得同震形变场，并与上一步的插值结果进行对比分析。结果显示，插值结果与反演结果在极震区吻合得很好 ...
Jintian Li +3 more
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Equine Veterinary Journal, EarlyView.Abstract Background The middle conchal sinus (MCS) (ethmoidal sinus) remains one of the least understood equine paranasal compartments. Despite recognition of its involvement in sinonasal disease, disorders of the MCS often remain underdiagnosed in the absence of computed tomographic (CT) imaging due to limited anatomical understanding and challenges ...
J.‐B. Pavard +3 more
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Integrative Conservation, EarlyView.Through systematic price collection and correction for underreporting and undetected seizures, the global illegal wildlife trade (IWT) is estimated at US$28.4–39.5 billion per year. This finding highlights that previous valuations were underestimates.
Jia Hao Tow, L. Roman Carrasco
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Wildlife Letters, EarlyView.We examined changes in perceived risks associated with chronic wasting disease (CWD) and perceived trust in wildlife agencies over time across 10 studies in eight states. Results indicated that perceived risks to both deer and humans declined the longer the disease had been in a state. Results also indicated that agency trust evaluations were positive,
Jerry J. Vaske, Craig A. Miller
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Wildlife Letters, EarlyView.Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu +5 more
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Zhejiang Daxue xuebao. Lixue ban, 2007 为了使ZGB模型结果更接近实验中没有O的中毒态，利用改进的ZGB模型模拟化学反应.应用蒙特卡罗模拟方法研究考虑次近邻格点参与化学反应的ZGB模型的相图.观察到一级相变点值变大，二级相变点值变小，反应窗口变宽.模拟得到相图更接近实验，加深和拓宽了对ZGB模型吸附机制的理解和掌握，同时对非平衡态物理的内在规律有了进一步的认识.
GANKe-chong(淦克冲) +2 more
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Wildlife Letters, EarlyView.Using radiotelemetry, we found that the movement and home range of the endangered Sacalia bealei varied significantly across reproductive classes and seasons, with males exhibiting greater movement than females during wet and mating seasons. The species exhibits strong aquatic dependence, favoring deep pools interspaced among riffle‐pool sequences ...
Wing Sing Chan +3 more
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四川大学学报. 自然科学版, 2004 作者利用电阻法和伸长率 温度曲线的测试,研究了R相变和马氏体相变对TiNi记忆合金双向记忆效应(TWSME)的贡献,并研究了热机械训练对相变特征的影响.研究结果表明,热机械训练可导致降温时R相的出现,并且R相变对双向记忆效应的贡献远大于马氏体相变的贡献.在双向记忆效应训练过程中,由于位错的引入,能引起相变点Ms,Mf,Rs,As和Af的下降.
封向东 +4 more
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