Results 21 to 30 of about 39,766 (300)
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
doaj +1 more source
采用蒙特卡罗(Monte Carlo)结合退火技术研究了线性梯度高分子与纳米颗粒共混体系的相分离行为.模拟研究发现其相分离不但与梯度高分子的分布函数f(t)有关,还与链长、相互作用能和纳米颗粒浓度相关.随着参量的改变发现了无序相与层状相(L)或穿孔层状相(P)以及无序相与球状相(S)相变,此外,当在特定的单体A浓度时同时还出现了共混相,同时纳米颗粒随机分布在单体A区域内.
WANGLi-li(王立丽)+2 more
doaj +1 more source
Using porous metals to enhance heat transfer in phase change materials (PCMs) [PDF]
Heat transfer enhancement mechanism of Phase Change Materials (PCMs) by high-porosity metal foams was investigated in this study. The Darcy-Brinkman-Forchheimer modified flow model was employed in the numerical simulations to consider the non-Darcy ...
Tian, Y. (Yuan), Zhao, Changying
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ABSTRACT In the context of Europeanisation and neo‐corporatism, we examine the lengthy process of revising the Nondiscrimination Act in Finland, spanning from 2007 to 2023. The focus is on the mandate of the Nondiscrimination Ombudsman in the workplace and on explaining the sudden policy change of strengthening it after a prolonged standstill.
Laura Jauhola, Kati Rantala
wiley +1 more source
在土地利用/覆盖变化监测中,通常要对多时相遥感影像进行辐射归化处理,使得影像间的成像差异减小,相同地物的光谱特征相似.本研究利用两时相ETM+影像,精确选取不变像元,采用分段线性回归,探讨一种自动辐射归化处理方法.研究方法充分考虑了影像间成像条件的差异,通过影像对应波段差值直方图剔除变化像元来有效选取不变像元,将不变像元划分为暗、灰和亮3类并分级确定校正系数进行辐射归化处理.结果分析表明该方法具有一定优势.
ZHANGYou-shui(张友水)+2 more
doaj +1 more source
Electronic structure and thermal transport properties of Chalcogenide mGeTe•nSb2Te3 compounds [PDF]
在信息高速发展和能源加速枯竭的今天,寻找高效的新能源材料和信息存储材料迫在眉睫。在锗(Ge)、锑(Sb)、碲(Te)三元相图中,二元相GeTe和Sb2Te3连线上的一系列mGeTe•nSb2Te3(简称GST)化合物既是高效的热电转换材料,同时又能利用快速相变存储数据,具有非常广阔的应用前景。无论是作为相变存储材料还是热电材料,GST化合物中的热传导是影响其使用性能的至关重要的因素。材料的热传导是一个非常复杂的过程,研究者至今仍在寻找一种高效、准确、低成本和普适的测量方法。受限于测量技术 ...
潘元春
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Abstract Parental reflective functioning (PRF) is important in guiding parenting behavior. It is traditionally measured with interviews that are relatively time‐consuming. A self‐report measure of PRF, the Parental Reflective Functioning Questionnaire (PRFQ), has been developed but has not yet been extensively validated across different sociocultural ...
Marjo Flykt+4 more
wiley +1 more source
Synthesis and Crystalline Phase Control of VO2 Powders [PDF]
VO2是一种具有相变特性的热敏功能材料,半导体单斜晶相VO2(M)到金属导体相VO2(R)的可逆转变,导致红外透光率变化,在建筑、汽车等领域有应用前景。在具体应用中,粉体粒径过大或是相变温度过高限制了其应用的发展。因此,探索单斜晶相VO2(M)粉体的高效制备方法、晶相控制以及研究细化粒径和降低相变温度的影响因素,具有挑战性。 本论文采用了液相沉淀-煅烧法与湿化学-热分解法,制备了单一组分的单斜晶相VO2(M)粉体,实验以V2O5为原料,第一步通过添加盐酸肼和浓盐酸,制备VOCl2前驱体溶液 ...
黄敏
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The role of child language ability and parental mentalization in early child dysregulation
Abstract Dysregulation in early childhood is associated with increased vulnerability to psychopathology and poor psychosocial outcomes. While there is evidence that both child language ability and parental mentalization are associated with dysregulation in early childhood, there is little understanding of the relationships between these variables, and ...
Sara Cibralic+6 more
wiley +1 more source
Phase transitional behaviors of V-shaped liquid crystal molecule in electric field [PDF]
作为物质的第四态,液晶如今被广泛应用于光电显示器件之中。液晶态,同时具有类似于液体的流动性质和类似于晶体的有序性与各向异性。在热致液晶中,我们可以根据分子的有序性和排列形式的不同,将其分为向列相液晶、近晶相液晶和胆甾相液晶。由于向列相液晶的稳定结构、较低粘度和较宽的工作温度范围,而被应用的最为广泛。 向列相液晶可存在三种状态—双轴相、单轴相和各向同性相。过去几年,双轴向列相液晶在快速响应显示器件中的应用前景引起了广泛的关注,因为其沿着辅轴转动比沿着主轴转动节能且快捷的多。实际上,在理论和实验中 ...
彭欢高
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