Results 11 to 20 of about 9,282 (191)
Rare Metals, EarlyView.ABSTRACT Nanocomposite permanent magnets with reduced rare‐earth content represent a promising class of materials for next‐generation high‐performance applications. However, asynchronous precipitation of soft and hard magnetic phases often results in grain size mismatch and limited coercivity.
Xiaowei Zhang +6 more
wiley +1 more source
, 2018 匝道弯桥线型优美、适应性强,广泛应用于城市道路交通建设中。然而,较小的曲率半径也容易引发一些病害事故,例如支座脱空、梁体侧移、预应力筋崩出、甚至梁体倾覆等。为分析匝道弯桥的受力性能,同时找出这些问题产生的主要原因以及作用规律,本文以某实际匝道弯桥作为工程背景,通过建立有限元建模,并施加多种荷载工况进行计算分析,探讨了不同曲率半径和跨径对匝道弯桥基本力学性能的影响。福建省交通运输科技项目 ...
曾勇文, 梅子飞, 裘是
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基于COMSOL Multiphysics的多重雷电流分量对OPGW断股分析
Dianci bileiqi, 2020 光纤复合架空地线（OPGW）的断股严重影响着电力系统的安全稳定性,为了研究雷电流对OPGW断股的影响,应用COMSOL Multiphysics对雷击点局部温度进行仿真,对连续雷电流B、C分量的作用下与多重雷电流A、B、C分量的作用下进行OPGW断股特性分析。结果表明:转移电荷量的大小是决定断股的主要原因。多重雷电流A、B、C分量作用产生温度与断股损伤程度均高于连续雷电流B、C分量的作用。先导雷电流分量越多,作用在OPGW表面遗留的载流子越多,转化的温度越高 ...
孙伟 +6 more
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Theoritical investigations of structural stability, mechanical and thermodynamics properties for γ’ precipitates in Co-based superalloys [PDF]
, 2015 随着国防科技的迅猛发展，新一代的航空航天飞机对发动机涡轮叶片材料的承温能力提出更高的要求。传统Ni基高温合金由于熔点的限制，其最高使用温度已不能满足需要。寻找下一代新型高温合金以满足发展更高效率航空发动机的需求是国内外学术界和产业应用领域共同关注的焦点。最近，新型γ’析出相强化型Co基合金的发现在全世界掀起了开发新型钴基高温材料的热潮。类似于γ’-Ni3Al，γ’析出相在新型Co基高温合金中起到了至关重要的作用。γ’相的结构稳定性、弹性力学性质与温度的依存关系直接决定了Co基合金在高温下的性能表现 ...
许伟伟
core
Precise identification and threshold inversion of pores and fissures in CT digital coal rock based on Bi-PTI model [PDF]
, 2023 In the research area of the CT digital coal petrography, the selection of gray threshold directly affects the accuracy of spatial structure remodeling. To allow the pores and fissures space remodeling data to more accurately represent the real structure ...
Bo ZHAO +5 more
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Rare Metals, EarlyView.ABSTRACT Converting CO2 to CH4 under mild conditions is a promising strategy for solving environmental and energy problems, but also a challenge. In this work, the low‐temperature CO2 hydrogenation process over Ni/CeO2 catalysts was significantly accelerated by optimizing the H2 dissociation ability of Ni through the size effect, thus A‐Ni/CeO2 with an
Yu Xie +8 more
wiley +1 more source
, 2014 用荧光光谱法研究了绿原酸、新绿原酸、隐绿原酸与溶菌酶之间的相互作用。绿原酸（cA）、新绿原酸（NcA）、隐绿原酸（CCA）均能显著焊灭溶菌酶的内源荧光并以静态焯灭为主；随着温度的升高其结合常数和结合位点均呈现降低的趋势。根据热力学参数判断确定CA与LYSO之间以疏水作用力为主，NCA与LYSO之间以氢键和范德华力为主，CCA与LYSO之间以静电作用力为主。
兰月香, 刘梅仙, 陈世忠, 王弘
semanticscholar +1 more source
, 2016 跨海大桥是最需要考虑节约资源和进行环境保护的桥梁。而大跨度公铁两用斜拉桥是目前占用跨海通道资源最少的大桥,也是跨海大桥设计的首选桥型。在广泛调研跨海大桥和收集文献资料的基础上,对我国近年来修建的跨海大桥进行了梳理统计,发现我国已经建设的公路跨海大桥大部分的主航道桥是斜拉桥。对部分国内外大跨度公铁两用斜拉桥的结构设计关键技术进行了论述;结合大跨度公铁两用斜拉桥的结构特点,对适用于大跨度公铁两用斜拉桥的结构体系和桥面布置进行了对比分析;提出了影响公铁两用斜拉桥跨度增大的问题与对策 ...
雷俊卿 +1 more
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Rare Metals, EarlyView.ABSTRACT Early detection of thermal runaway (TR) is essential for lithium‐ion battery (LIB) safety, as unchecked TR risks catastrophic failures in energy storage systems. Gas‐based sensing offers a faster and more direct approach by detecting decomposition products at the molecular level.
Tianshui Liang +9 more
wiley +1 more source
Mechanical Properties of Sandstone after High Temperature [PDF]
, 2016 In this study, we conducted a number of mechanical experiments on sandstone samples from Junan County, Linyi City, in order to investigate the mechanical properties of the sandstone samples after being subjected to high temperatures, ranging from 25 ℃ to
Geng, Jishi +3 more
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