Results 41 to 50 of about 12,470 (167)
Controlled Synthesis and Photocatalytical/Electrochemical Research of Transition Metal Sulfide and C3N4 Composites [PDF]
, 2016 化学掺杂（复合）和微观形貌调控是改变材料结构特征，进而改善材料性能的两种主要手段。其中化学掺杂可以改变材料本身的价带和导带的位置，调整能带结构，并且掺杂的原子或复合的半导体化合物会与原材料产生一系列的互相激发反应，在材料表面或内部引起新的化学或物理反应，从而影响物质的性质；而微观形貌调控则是直接针对材料表面，控制合成不同的表面形貌，使其暴露出的活性位点发生改变，从而改变材料表面所带的基团及其比表面积，最终影响材料的光学、热学、电学、力学或化学特性。 在化学掺杂研究中 ...
王蓉蓉
core
Genetic origins and climate‐induced erosion in economically important Asian walnuts
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract The global climate is undergoing unprecedented changes, posing significant threats to species persistence. However, the spatiotemporal impacts on genetic diversity remain poorly understood, hindering species conservation and management. Walnuts, generally referred to as Juglans regia and J. sigillata, are economically vital in Asia, but little
Peng‐Zhen Fan +17 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2006 目的观察不同渗透压溶液中人红细胞形态和细胞膜表面细微结构的变化。方法用5%葡萄糖溶液（等渗液）,0.6%NaCl溶液（低渗液）,1.5%NaCl溶液（高渗液）分别处理人红细胞,用原子力显微镜观察人红细胞的变化。结果（1）经5%葡萄糖处理的红细胞形态正常;膜表面细微结构为孔洞,孔洞之间为条形隆起,孔洞交织排列,孔洞大小约15 nm100 nm,条形隆起宽约30 nm。（2）经0.6%NaCl溶液处理的红细胞大部分膨胀,细微结构中孔洞呈裂隙状,宽约10 nm,条形隆起粗大,宽约40 nm。（3）经1.5 ...
马亚敏 +5 more
doaj
Optimized Copper Distribution and Enhanced Coercivity in PrO2‐Doped Sm2Co17‐Type Magnets
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT A rational design of Cu distribution is crucial for achieving optimal magnetic properties in Sm2Co17‐type magnets. In this study, nanostructured PrO2 powders were employed to induce Cu redistribution at grain boundaries while preserving the cellular microstructure. The corresponding coercivity (Hcj), remanence (Br), and maximum energy product (
Qi‐Qi Yang +5 more
wiley +1 more source
Ion Irradiation Effects and Evaluation of Al/B4C Neutron Absorbing Materials and Zirconium Alloys [PDF]
, 2015 中子吸收材料和核燃料包壳材料与核燃料安全密切相关。中子吸收材料用于乏燃料的运输和储存中，保持燃料的次临界状态，防止临界事故发生；核燃料包壳材料是防止核燃料和高放射性物质泄漏的重要屏障。本论文主要研究了Al/B4C中子吸收材料和锆合金包壳材料的离子辐照效应，并进行了服役评估。 Al/B4C金属基复合材料具有良好的机械性能，热传导性能和中子吸收性能，主要应用于乏燃料的干式储存罐和乏燃料池格架中。在服役过程中，Al/B4C中子吸收材料不可避免地经受着中子辐照和氦的累积。为了研究辐照效应以及氦在材料中的行为 ...
张飞飞
core
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Transition metal carbides demonstrate exceptional mechanical properties but confront a critical hardness–toughness trade‐off. Spinodal decomposition‐mediated phase separation is an effective approach to enhance mechanical properties in carbide ceramics through high‐temperature treatment.
Zhi‐Xuan Zhang +6 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2005 目的观察人红细胞经8种实验室常用溶液处理后的形态结构,找出利用原子力显微镜观察人红细胞的最佳溶液,探索人红细胞膜表面的细微结构。方法利用原子力显微镜观察经8种溶液处理后的人红细胞。结果从背景颗粒、红细胞的大小形态和红细胞膜表面细微结构来看,1%甲醛溶液、枸橼酸盐缓冲液、5%葡萄糖溶液及TAE溶液处理的红细胞样本背景颗粒少,红细胞大小正常（7μm8μm）、形态双凹圆盘状,红细胞膜表面细微结构清晰,可见红细胞膜表面有孔洞（15nm100nm）,孔洞之间为条形隆起（15nm100nm）,孔洞交织排列 ...
马亚敏 +5 more
doaj
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
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Introducing solid‐state phase transformations into the design of heterogeneous structures is considered an effective strategy for simultaneously optimizing both microstructure and mechanical properties. This study investigates the thermodynamic and kinetic mechanisms of the γ → α transformation in Ti48Al5Nb2Cr0.6Re0.1C alloy under different ...
Ke‐Xuan Li +6 more
wiley +1 more source