Results 41 to 50 of about 15,411 (192)
Rare Metals, EarlyView.ABSTRACT Against the backdrop of global clean energy transition and surging demand for lithium resources, lithium extraction from salt lakes presents unprecedented development opportunities. Nanofiltration (NF) membrane technology, recognized for its efficiency, energy savings, and environmental benefits, demonstrates significant application potential ...
Wen‐Feng Li +5 more
wiley +1 more source
Damage characteristics and support optimization of roadway surrounding rock in near-vertical coal seams under combined dynamic and static loads [PDF]
Currently, most research on rock burst prevention and control focuses on horizontal and gently inclined coal seams. However, due to the unique occurrence characteristics of near-vertical coal seams, the characteristics of rock burst in these seams are ...
FENG Panfei +3 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT The growing concern over human health issues, driven by increasingly severe electromagnetic pollution from 5G communication, has made the urgent development of high‐performance electromagnetic wave (EMW) absorbing materials. Although carbide‐based materials are promising because of their conductive and polarization losses, existing single ...
Chenqiang Duan +9 more
wiley +1 more source
基于Pro/E Mechanica的农业机械用链轮的动力学分析
Jixie chuandong, 2015 链传动由于其传动可靠、结构简单,在农业机械中获得广泛应用。在工厂化水产养殖中应用的链斗式过滤装置中,作为链传动中关键零件,链轮受到工作环境恶劣、复杂载荷等因素影响,齿根磨损严重而失效。为增加链轮寿命、减少应力集中,利用Pro/E平台建立链轮的三维模型,并应用Pro/E Mechanica进行动力学分析,进行链轮设计的结构优化,在减轻其重量的同时,使链轮受力基本均匀,减少应力集中和变形。通过对链轮做全局敏感度分析表明:齿顶圆弧半径的增加削弱了最大应力的增长;最大应力随凸缘直径的增加而减小 ...
程启云 +4 more
doaj +1 more source
Dianci bileiqi, 2016 针对一起500 kV线路玻璃绝缘子集中破碎8片现象,进行了污秽度测量、成份分析、泄漏电流测量以及火花放电观察。结合运行环境和天气,认为玻璃绝缘子在污秽中成份金属离子和金属氧化物含量比较高,导致绝缘子串上产生长期工频泄漏电流和火花放电。长期工频泄漏电流和火花放电产生的电应力使得玻璃件损伤和钢化层破坏;污秽分布不均以及下雨天气,导致泄漏电流和火花放电集中在污秽严重一侧,玻璃件产生温差,从而产生热应力;在电应力和热应力的共同作用下,最终导致了本次集中破碎。
马御棠 +7 more
doaj
Temporal and spatial evolution law of microseisms and induced impact mechanism in complex spatial structure area of steep and extremely thick coal seam [PDF]
The occurrence of coal mine rock burst disasters is closely related to the spatial structure, especially in the complex spatial structure area. It is of great significance to master the law of coal and rock catastrophe and reveal its mechanism in the ...
Changliang LU +8 more
core +1 more source
Wildlife Letters, EarlyView.Effective wildlife law enforcement is important in the drive for biodiversity conservation. This study examined the challenges of wildlife law enforcement in Oyo and Lagos States of Nigeria across four security outfits (Nigerian Police Force [NPF], Nigerian Customs Service [NCS], National Environmental Standards and Regulations Enforcement Agency ...
Oluwatosin Mercy Dada +2 more
wiley +1 more source
Shiyou jixie, 2014 对压裂球进行受力分析和地面承压测试是开发高性能压裂球的关键。采用有限元数值模拟方法对压裂球进行了受力分析，研究了不同压力对压裂球内应力和塑性变形区域的影响规律，并通过承压试验测试了压裂球的承压性能。为了模拟真实的密封过程，选择显式动力方法定义分析步，在整个过程中认为球座无变形。分析结果表明，压裂球在不同压力载荷下的应力集中区域为球与球座接触区，随着压力的增大，应力集中区和塑性变形区逐渐向球心延伸；当压力超过110 MPa时，压裂球最大应力值已经接近材料的应力极限。
左争云 +3 more
doaj
Dizhen xuebao渝东南武隆地区志留系龙马溪组页岩储层发育，构造裂缝是页岩气运移和聚集的主控因素，而古构造应力场控制着构造裂缝的发育，对武隆地区页岩气的勘探开发具有较大影响。本文对武隆地区及周缘发育的节理进行分期配套处理，明确了武隆地区的古构造应力方向，同时通过岩石声发射实验计算得到了古构造应力的大小。在此基础上，利用ANSYS有限元软件建立了武隆地区志留系龙马溪组地层关键构造变形期的地质模型，并通过构造应力场的分析结果明确了该地区关键构造期的构造应力特征，以确定构造应力场数值模拟的边界条件，进而对构造应力场进行数值模拟。
Yizhen Pang +8 more
doaj +1 more source
Reasonable width and control technology of narrow coal pillar in gob-side entry driving in deep-buried bump-prone coal seam [PDF]
Aiming at the problem of large deformation of surrounding rock and difficulty of control gob-side entry driving in deep coal seam, taking the setting of narrow coal pillar in gob-side entry driving in deep-buried bump-prone coal seam as the engineering ...
BAN Dingcheng +3 more
core +1 more source