Results 41 to 50 of about 16,458 (194)
INFLUENCE OF HIGHNESS OF WALLS ON SEISMIC EFFECT OF HIGHRISE FRAME-WALL STRUCTURES [PDF]
, 2002 采用地震反应谱振型组合法 ,通过对不同墙体高度的高层框 -剪结构的计算分析 ,确定了剪力墙的适宜高度及影响剪力墙高度的主要因素Based on the SRSS method of seismic spectrum analysis, the highrise frame\|wall structures with different highness of walls are studied.
周军, 李少泉
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Dual‐Stage Heat Treatment for Enhanced Hydrogen Storage Properties of Mg−Ni−Y Alloys
Rare Metals, EarlyView.ABSTRACT Mg−Ni−Y alloy is considered to be one of the most promising hydrogen storage materials, but its high dehydrogenation energy barrier hinders its practical application. A dual‐stage heat treatment (490°C × 4 h + 550°C × 4 h) is applied to optimize the microstructure and hydrogen storage performance of a vacuum‐melted Mg94Ni3Y3 alloy.
You Lv +6 more
wiley +1 more source
Research of Dynamic Characteristics and Dynamic Damage Deformation Test of Red Clay [PDF]
, 2010 论文以动载作用下红粘土动力特性及动态损伤变形试验研究为主题，选取厦门港附近红粘土为试样，利用动三轴仪为主要试验装备，测试试样在呈正弦变化的动态荷载作用下的动力反应，从而研究动态荷载不同频率、不同幅值、试样不同含水率等因素对红粘土的动应力—应变、动变形—作用时间（作用次数）等动力学特性的影响。同时选取动弹性模量为损伤变量，通过研究损伤变量的变化，分析试样在动载作用下的损伤过程，并根据流变模型，建立了动态损伤方程。观测土样的微观结构，采用扫描电子显微镜（SEM），放大500倍和5000倍进行拍照 ...
曹勇
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, EarlyView.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 1995 从水力学与泥沙运动力学观点，对初生态侵蚀性坡面薄层水流的基本动力特性，如流产；充态、临界水深、阻力系数等几个基本问题，作了半理论性探讨。
沙际德 蒋允静
doaj
, 1993 该文采用微分离散差分方法求解滑流条件下的修正Reynolds方程.对于一阶导数间断的物理量-气膜厚度采用高精度保凸性磨光法进行处理.给出了气膜压强分布立体图以及几种因加工误差造成磁头滑块润滑面变形的误差型面的飞升曲线,中心线上压强分布,压力中心和负载随加工误差大小的变化情况 ...
傅仙罗, 孙征, 张红英
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Rare Metals, EarlyView.ABSTRACT As a promising alternative to sluggish Li2CO3‐based Li‐CO2 electrochemistry, Li2C2O4 offers a favorable 2e− discharge pathway, yet its selective formation and reversible decomposition remain debated. Herein, we propose a nonmetal‐metal synergistic catalyst—B‐Ti coregulated layered transition metal boride Ti18B18O9/graphene (B‐Ti/TiBOG)—to ...
Qiong Peng +8 more
wiley +1 more source
Gaoya dianqi, 2004 对与真空断路器相配的弹簧操动机构而言,其输出力特性和开关负载特性的合理匹配取决于凸轮机构的合理设计。按全程输出力大于阻力的原则,采用分段多项式方法确定了凸轮轮廓线。凸轮机构的理论计算与试验结果比较吻合,表明该方法能够有效地实现凸轮机构的优化设计,在满足操动机构运动特性的前提下,可降低弹簧刚度和输出力。
闫静, 马志瀛, 金黎
doaj
Investigation on Aerodynamic Characteristics of Long-Grouped High Speed Train Subjected to Crosswind [PDF]
, 2016 采用定常RANS方法,对长大编组高速列车的横风气动特性进行分析,从流场特性和气动力特性两个方面开展研究。结果表明,横风条件下,列车表面流动现象非常丰富,列车首尾流线型存在较多流动分离、再附等现象,且受横风侧偏角影响较大。在列车背风侧出现两个以上的复杂分离涡系,从列车头车下部开始,向列车下游发展并逐渐远离列车车体。分离涡系是列车承受非定常气动力的根源。列车头车是侧向力、滚转力矩最严峻的车厢,且随着横风侧偏角增大,侧向力、滚转力矩逐渐增大 ...
孙振旭, 尚克明, 杜健
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