The first major breakthrough for the alleviation of tubal infertility occurred in the last quarter of the twentieth century. Louise Brown was born on the 25 July, 1978 inOldham, England as a result of the pioneering work of Bob Edwards and the late Patrick Steptoe with the help of the late Jean Purdy. Bob Edwards received the ‘Nobel Prize for Physiology or Medicine’ for this work in 2010. In th...

Michaelis-Arbuzov reactions of S-aryl disulfide derivatives of 3'-thiothymidine or 5'-thioadenosine with tris(trimethylsilyl) phosphite proceeded in high yields to the corresponding phosphorothiolate monoesters. Subsequent hydrolytic desilylation and phosphate coupling were effected in one-pot using liquid-assisted grinding in a vibration ball mill. Novel 3',5'- and 5',5'-pyrophosphorothiolate-...

Downhole vibrations caused by rock breaking when drilling through pebbled sandstone formations negatively affect the rate of penetration (ROP) and safety downhole tools. Therefore, it is great significance to study cutting characteristics find a method reducing formations. Based on DEM (discrete element method), simulation model considering random filling high-strength gravels was established u...

Nowadays the surface texturing has been widely recognized as a usable capability to improve the tribological systems. In this paper, ultrasonic assisted turning (UAT) isperformed to create the micro textures on the flat faces. Micro surface texturing ismade on the Al7075-T6 by the UAT in the face turning process. Then, the influences of cutting speed feed, vibration direction and vibration ampl...

With the global economy and industry development, environment-friendly sustainable development has become mainstream of energy exploration utilization. New clean geo-energy exploitation one crucial transformation attempt traditional petroleum industry. However, different from key problems low efficiency high risk, caused by complex geological environment bottom-hole-assembly (BHA) vibration, ar...

Nowadays the surface texturing has been widely recognized as a usable capability to improve the tribological systems. In this paper, ultrasonic assisted turning (UAT) isperformed to create the micro textures on the flat faces. Micro surface texturing ismade on the Al7075-T6 by the UAT in the face turning process. Then, the influences of cutting speed feed, vibration direction and vibration ampl...