Mining in deep coal seams is characterized by high ground stress, often accompanied and rock dynamic disasters such as bursts. High-pressure water jet slotting technology can relieve pressure reduce the stress concentration on seam, which one of effective relief measures burst for mining. Reasonable parameters are an important influence effectiveness achieved a high-pressure jet. This paper use...

I will start this treatise with a history of two major themes in data integration. In my opinion, the topic began with the major retailers in the 1990s consolidating their sales data into a data warehouse. To do this they needed to extract data from in-store sales systems, transform it into a predefined common representation (think of this as a global schema), and then load it into a data wareh...

In order to automate the scooping task, it is desirable that the resistive force acting on the bucket be obtained before the scooping is performed. The objective of this study is to derive theoretically the resistive forces acting on the bucket during scooping of piled rock fragments. First, the changes in the shape of the rock pile due to the penetration of it by the bucket are modeled. Based ...

Rock burst support of deep rock mass has always been a difficult problem in geotechnical engineering. Aiming at the mass, new type pressure yielding and energy-absorbing bolt system is designed this paper. The energy absorption characteristics laminated spring members with different wall thicknesses were studied by static axial compression test drop hammer dynamic impact test. experimental resu...

Abstract The rockburst dynamic disasters in the process of deep coal mining become more and serious. Taking occurred 23130 working face Yuejin Coal Mine as engineering background, we study characteristics stress field around roadway, plastic failure morphological surrounding rock accumulation/release law elastic energy before after burst. An analysis model quantitatively describing physical roa...

the paper presents lower and upper bounds on the number of parity check digits required for a linear code that detects solid bursts of length $b$ or less and simultaneously any $e$ or less random errors. an example of such a code is also provided. further, codes capable of detecting and simultaneously correcting such errors have also been dealt with.

background adenylate cyclase toxin (cyaa) is an important virulence factor of bordetella pertussis, the causative agent of whooping cough, and a potential component of acellular pertussis vaccine. objectives in the present study the impact of invasive cyaa on oxidative activities of phagocytes was compared with the other form of this molecule to investigate the activity of different parts of mo...

Abstract The presence of manifestation in the Gondang indicates a specific geological condition. Those manifestations are Banyu Kuning Hot Spring, Selo Gajah and Jari Mud Burst. purpose this study, which was carried out near Mount Pandan, to identify distribution magnetic fields anomalies, including patterns potential geothermal energy region based on its magnetism. It also aimed explain rock s...