共搜索到1565条信息，每页显示10条信息，共157页。用时：0小时0分0秒560毫秒
Effect of landform on aerodynamic performance of high-speed trains in cutting under cross windLIU Tang-hong(刘堂红)1,2, ZHANG Jie(张洁)1,2(1. Key Laboratory of Traffic Safety on Track of Ministry... landforms of the cutting leeward on the aerodynamic performance of high-speed trains were analyzed based on the three-dimensional, steady, and incompressible Navier-Stokes equation and k-e double......
Trans. Nonferrous Met. Soc. China 28(2018) 1413-1423 Cutting parameter optimization for one-step shaft excavation technique based on parallel cutting method Qi-yue LI1, Kai LIU1, Xi-bing LI1, Ze-wei... March 2017; accepted 28 December 2017 Abstract: The outcome of the cutting blasting in a one-step shaft excavation is heavily related to the cutting parameters used for parallel cutting method......
Distribution properties of cutting tooth’s maximum load of spiral mining head for cobalt-crust XIA Yi-min, NIE Si-jun, BU Ying-yong, ZHAO Hai-ming (School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China) Abstract: Mathematic model of the tiny terrain covered cobalt-rich crust and the cutting process of mining head’s cutting tooth were......
on neighboring pillars, and the shear force also increases at relevant positions. However, the roof cutting and surface subsidence characteristics would perform in different patterns. In some cases, surface subsides slowly; in the worst scenario, shock bump may be induced by pillar and roof collapse. Key words: subsidence; deteriorating pillar; failure process; roof cutting Cite this article as: LUO Rong......
and a series of numerical investigations are conducted on the effects of discontinuities on cutting characteristics and cutting efficiency. In laboratory tests, five propagation patterns of radial cracks... will result in the decrease of the cutting efficiency when the spacing between cutters is 70 mm. Some modifications should be made to improve the efficiency when the rocks containing groups......
J. Cent. South Univ. (2021) 28: 112-125 DOI: https://doi.org/10.1007/s11771-021-4590-4 Optimization of cutting parameters with Taguchi and grey relational analysis methods in MQL-assisted face... of lubrication (MQL) system in face milling of AISI O2 steel and to optimize the cutting parameters by different statistical methods. Vegetable oil was preferred as cutting fluid, and Taguchi method was used......
Inhibition of acid mine drainage and immobilization of heavy metals from copper flotation tailings using a marble cutting wasteGulsen TozsinDepartment of Mining Engineering, Ataturk University摘 要:Acid mine drainage(AMD) with high concentrations of sulfates and metals is generated by the oxidation of sulfide bearing wastes. Ca CO3-rich marble cutting......
of Machine Education, Gazi University, 06500 Ankara, Turkey Received 17 June 2010; accepted 15 August 2010 Abstract: The effects of cryogenic cooling on cutting forces in the milling process of AISI...; the flow rate of liquid nitrogen was 5.2 L/min; two cutting directions (climbing and conventional milling), two machining conditions (dry and cryogenic cooling) and four cutting speeds (80, 120, 160......
2#飞剪剪切方式的改进朱玲1,宋明2,渠济华3,夏云龙2(1.北京市北京金自天正智能控制股份有限公司轧钢工程部2.宣龙高速线材有限责任公司3.北京中冶设备研究设计总院有限公司)摘 要:宣龙高速线材有限责任公司第二高速线材厂的2#飞剪,随着生产节奏的加快和不断提速,频繁出现切尾不稳定,二次反爬等问题.针对这一问题,对飞剪的控制系统和剪切方式进行了改进,改变了飞剪工作的初始位置,从而缩短了飞剪一次剪切动作的时间,满足了节奏加快和提速的要求,同时还相应地调整了传动系统的参数.投入实际生产后,该飞剪切头,切尾稳定,大大......
Efficient near-infrared quantum cutting by Ce3+-Yb3+ couple in GdBO3 phosphors张浩,陈金灯,郭海Department of Physics, Zhejiang Normal University摘 要:Ce3+ and Yb3... and luminescent properties. An efficient near-infrared (NIR) quantum cutting (QC) from the phosphors was observed, which involved the emission of two low-energy NIR photons (around 971 nm) from......
