Results 21 to 30 of about 15,411 (192)
Rare Metals, EarlyView.ABSTRACT Photodetectors, based on GaAs nanowires (NWs), hold significant promise in the fields of high integration micro‐ and nano‐optoelectronics applications because of their outstanding electronic and optical properties. To date, significant efforts have been directed toward enhancing the performance of photodetectors, aiming for high detectivity ...
Yu Hao +11 more
wiley +1 more source
Study on pressure relief and permeability enhancement effect of cutting coal seam with diamond-bead wire saw [PDF]
In order to explore the pressure relief and permeability enhancement effect around coal seam slot cut by diamond-bead wire saw, firstly, the mechanical model of a doubly clamped roof beam based on the stress of the slot roof was established to analyze ...
Chen WANG +8 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
wiley +1 more source
Mechanism of rock burst induced within the fully mechanized top coal caving face with overlying knife-shape-like gob and hard thick roof [PDF]
Irregular upper gobs may increase the risk of rock burst incidents in coal mines. Investigating the rock burst mechanism in the complex mining spatial structure of multi-seam rock bursts is essential for ensuring the safe extraction of coal resources ...
Chao ZHOU +6 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT The similar physicochemical properties of alkali metal elements make the co‐enrichment and precise separation of Cs+ and Rb+ in complex brine systems highly challenging. Here, an all‐inorganic strategy is proposed, which achieves efficient enrichment and precise separation of Cs+ and Rb+ in high‐salt systems by constructing Sr2+/Ba2+‐based ...
Kang Li, Ruixin Ma, Shina Li
wiley +1 more source
Research on Structural Design and Mechanical Behavior of Double Arc Tooth Profile Harmonic Drive [PDF]
, 2015 谐波齿轮减速器是一种传动精度高、减速比大并能够在密闭空间传动的齿轮传动机构，应用领域广泛，尤其在航空航天领域有不可替代的优势。常用的渐开线齿廓齿根处会出现应力集中以及齿顶产生尖点啮合现象，影响其承载性能和啮合质量。双圆弧齿形谐波齿轮以其良好的承载能力与啮合性能逐渐成为研究热点，本文根据谐波齿轮设计理论设计了双圆弧谐波齿轮装置，并对其结构性能、接触特性以及动力学等方面的分析，探索相关规律，为后续在结构优化、增强啮合性能提供了一定的理论依据。 论文主要包括以下几方面内容： 1 ...
王萌萌
core
Advances in Elemene Nanodelivery Systems: From Material Design to Disease Treatment
Rare Metals, EarlyView.ABSTRACT Elemene (ELE) is a bioactive sesquiterpenoid extracted from traditional Chinese herbs, demonstrating broad‐spectrum antitumor, anti‐inflammatory, and analgesic properties with significant therapeutic potential. However, its clinical utility is constrained by inherent physicochemical limitations, including volatility and hydrophobicity, which ...
Xiao Wang +9 more
wiley +1 more source
基于AWE GCB/GIS自力型触头接触压力分析及应力集中系数初探
Gaoya dianqi, 2014 为实现参数化分析,在AWE（ANSYS workbench environment）集成的DM（design modeler）环境中建立模型,并合理简化。在AWE集成开发环境下,设置自力型触头的工况对其进行接触压力分析,并对结果进行了理论计算校核。考虑到触指根部两侧小范围存在应力集中现象,利用DOE法（the design of experiments method）建立对应的参数化数值模拟,并对其小样本采集分析。根据计算结果确定其应力集中系数在1.201.27范围内变动。
张沛文, 陈伯荣, 周庆清
doaj
Fatigue Life Prediction for Pre-Corroded Aluminum Alloy 2524based on Stress Severity Factor Method [PDF]
, 2013 腐蚀是金属结构失效的重要原因之一，航空结构的腐蚀损伤常常造成一些灾难性事故。机身结构用高强度铝合金处于含氯化物的腐蚀环境时很容易发生点腐蚀损伤。点蚀坑作为应力集中源，是裂纹容易萌生处，疲劳裂纹优先从腐蚀坑处萌生。腐蚀坑的应力集中情况跟腐蚀坑的深度、大小和形状等特征参数有关。因此，定量研究腐蚀坑特征参数与应力集中系数关系，用应力严重系数法对含腐蚀损伤结构进行疲劳寿命预测具有重要的研究价值。 本文主要研究了腐蚀坑特征参数与应力集中系数的关系及用应力严重系数法对腐蚀预损伤铝合金2524进行疲劳寿命预测。 首先，
赵伟
core
Study on the stress evolution law of surrounding rock and cooperative control technology in coal seam group mining [PDF]
Aiming at addressing the challenges encountered in roadway support during coal seam group mining, this project focuses on the 212 main return-air cross-cut in Tucheng Mine, Guizhou Province.
Jitao ZHANG +8 more
core +1 more source