In order to study the optimal coal pillar width and surrounding rock control mechanism of gob-side entry under inclined seam condition, 130205 return air adjacent 130203 gob in Yangchangwan No. 1 well is taken as a typical engineering background. By means background analysis, theoretical analysis based on inside outside stress field, numerical simulation by FLAC3D software, situ industrial test...

The exploitation of deep resources and energy needs to break hard rock. Aiming at the problem rock fragmentation, this paper proposes a variable cross-section squeezing pulsed water jet technology (SPWJ). SPWJ was generated under pump pressures 5.2, 6.8, 8.5, 10, 11.9, 13.8 MPa carry out erosion experiments. Features such as spalling area, depth, volume loss, decomposition per unit inlet pressu...

Due to the high in situ stress of deep rock mass and restraining effect surrounding rock, hole blasting vertical shaft faces problems low borehole utilization rate poor effect. In this regard, paper proposes a multi-stage cut technology shaft. Preliminary engineering practice shows that such can make better use explosive energy, reduce increase rate. Furthermore, based on continuum-based discre...

We recently identified a novel human protein kinase, p160 ROCK, as a putative downstream target of the small GTPase Rho. Using the human ROCK cDNA as a probe, we isolated cDNA of two distinct, highly related sequences from mouse libraries. One encoded a mouse counterpart of human ROCK (ROCK-I), and the other encoded a novel ROCK-related kinase (ROCK-II). Like ROCK/ROCK-I, ROCK-II also bound to ...

background: sperm dna fragmentation is known as an important cause of male infertility. the influence of sperm dna damage on reproductive potential has been subject of many studies indicating various results and remaining the subject controversial. in this study, we investigated differences of the semen parameters and intracytoplasmic sperm injection (icsi) outcome according to sperm dna fragme...

background: although the effectiveness of ginger as an antioxidant agent has been exploited, little human research has been conducted on its activity on male reproductive functions. objective: this study was designed to investigate the effects of ginger (zingiber officinale) on sperm dna fragmentation (sdf) in infertile men. materials and methods: this randomized double-blind, placebo-controlle...

Abstract Explosive volcanic eruptions can produce vast amounts of ash made up mainly fragments magmatic glass, country rock and minerals < 2 mm in size. Ash particles forming from magma fragmentation are generated by several processes when brittle response accommodates (local) deformation stress that exceeds the capability bulk material to respond viscous flow. These span a wide range temper...

Drilling into a rock massif is energetically extremely consumptive process. Hence the optimization of drilling regime with objective of energy consumption minimization, is very important. Proposed article discusses partial problem of this problem. During the drilling process it is useful to know the drilled rock type, whereas to particular drilled rock needs convenient drilling regime, which is...