Results 41 to 50 of about 13,137 (167)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Zirconium dioxide (ZrO2) thin films are critical materials owing to their thermal stability, mechanical durability, and optical transparency enabling applications in photonic, sensing, and electronic devices. However, achieving uniform deposition via plasma‐enhanced chemical vapor deposition (PE‐CVD) has remained challenging due to poor ...
Nour Manafikhi +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2021 渗透是崩壁降雨重分布的关键且直接影响其重力侵蚀过程。试验设计6次干湿循环，通过进行崩壁4层土壤的饱和渗透试验并结合数字图像处理技术，研究了干湿循环效应下崩壁4层土的裂隙演化规律及其对各层土饱和渗透性能的影响。结果表明：（1）随干湿循环次数的增加，表土层和红土层裂隙发育明显，裂隙率逐渐增加后趋于稳定，过渡层和砂土层几乎没有产生裂隙；表土层在第3次循环后裂隙几乎发育完全，裂隙率达到3.50%，形态纤细且破碎，而红土层在第1次循环后裂隙骨架基本定型，随着干湿循环的进行，裂隙宽度不断增大至一定程度时不再发生变化；
王佳妮, 马戌, 张晓明
doaj
Calorimeter for determination of heat sink of endothermic hydrocarbon fuels(吸热型碳氢燃料热沉测定装置研究)
Zhejiang Daxue xuebao. Lixue ban, 2005 根据傅立叶定律径向系统的一维传热模型结合Tian's方程建立了一套高温流动型热量计，用于吸热型碳氢燃料的热沉测定和引发剂筛选；考察了系统的热稳定性能，用电标定的方法对仪器在500、550、600、650、700、750、800 ℃时的量热系数进行了标定，绘制了正庚烷在800 ℃、载气流速为0.04 m3/h条件下热裂解的热谱曲线，以正庚烷为模型化合物测定了其热沉.实验证明仪器基线稳定，数据可靠，复现性能良好，有较高的灵敏度和测量精度，能够满足实验需要和工作要求.
ZHOUXi-peng(周西朋) +3 more
doaj +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Formic acid (FA) is considered to be a safe and convenient hydrogen source; however, achieving controlled and efficient FA dehydrogenation under mild conditions using stable solid catalysts remains a significant challenge. Pd‐based catalysts have been extensively studied due to their superior catalytic activity to other metal catalysts.
Shuai Wei +10 more
wiley +1 more source
Gaoya dianqi, 2012 由于光伏阵列的IV特性存在强烈的非线性,光伏系统的最大功率跟踪工作电压可能处于不同的非线性区段,系统调节器的不合理设计,可能造成系统的不稳定甚至崩溃。笔者针对光伏系统存在的不稳定区域问题,通过建立系统状态方程和传递函数,分析系统在MPPT控制中出现的不稳定现象和原因,并进行了仿真和实验验证,确定了影响因素。通过对系统控制参数的正确调节以及母线电容的适当选择可以增加系统的稳定性。
黄明玖, 罗皓泽, 苏建徽
doaj
Calculation of slope stability of fault-containing slopes under the action of cyclic blast vibration [PDF]
In order to accurately quantify and predict the evolution of slope stability of fault-containing slopes under the long-term effect of blasting vibration, and to realize the safe, efficient and sustainable mining of open-pit mines. Taking an open-pit mine
Dong WANG +3 more
core +1 more source
Hobbyist preferences for pet freshwater turtles
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract The burgeoning pet trade is a primary threat to wild freshwater turtles worldwide. Although the risks from commercial exploitation of turtles have been discussed widely, there is little empirical research on preferences for pet turtles from a hobbyists’ perspective.
Jingjing Zhao +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2007 针对弃渣场边坡容易发生细沟侵蚀的问题,采集弃渣场坡面不同坡位的弃渣样品,对弃渣容重、含水量、饱和导水率、饱和含水量、砂粒含量、碎石含量等物理指标进行测定;与此同时,还对各点的样品进行直剪试验,并以此对弃渣场边坡稳定性特征进行分析。结果表明:新形成弃渣场坡面由上而下,其土体内摩擦角ψ逐渐增大,而土体粘滞系数C的变化与弃渣场坡面形成过程关系密切,一般而言,坡面的上部和下部粘滞系数C较小,说明弃渣场坡面上部土体的稳定性较中下部弱;对土体其他物理性质指标与土体的内摩擦角ψ、粘滞系数C进行相关性分析 ...
刘建伟 +3 more
doaj +2 more sources
Seepage characteristics of accumulation landslides under different types of heavy rainfall stability analysis [PDF]
Heavy rainfall is a major causes of sedimentary landslide disasters, and understanding the spatiotemporal dynamic characteristics of the seepage field in landslides under heavy rain is crucial for evaluating landslide stability and providing ...
Hao SHI +5 more
core +1 more source
Growing Demand and Uneven Supply: Eight Years of Nature Education in China 需求增长与供给不均:中国自然教育八年发展回顾
Integrative Conservation, Volume 5, Issue 1, Page 46-58, March 2026.ABSTRACT This study examines the role of nature education in advancing conservation and sustainability in China between 2014 and 2023. Drawing on national survey reports and historical–comparative methods, it analyses the dynamics of public demand, institutional supply, and practitioner capacity.
Qi Yunxi, Lyu Xiang, Huang Yu
wiley +1 more source