Recent studies have increasingly investigated construction methods for tunnel excavation because of growing underground space development. Although the New Austrian tunneling method (NATM)—a representative method—can be applied to various ground conditions, as well having good constructability and economic feasibility, it suffers from problems such vibration noise. By contrast, using a boring m...

like most limestone mines, which produce the raw materials required for cement companies, the transportation cost of the raw materials used in the shahrood cement company is high. it has been tried to build the crushing and grinding plant close to the mine as much as possible. on the other hand, blasting has harmful effects, and the impacts of blast-induced damages on the sensitive machinery, e...

Powder blasting, or Abrasive Jet Machining (AJM), is a technique in which a particle jet is directed towards a target for mechanical material removal. It is a fast, cheap and accurate directional etch technique for brittle materials like glass, silicon and ceramics. By introducing electroplated copper as a new mask material, the feature size of this process was decreased. It was found that blas...

Tele–operated service robots are used for extending human capabilities in hazardous and/or inaccessible environments. Their use is undergoing an exponential increase in our society, reason why it is of vital importance that their design, installation and operation follow the strictest possible process, so that the risk of accident could be minimised. However, there is no such process or methodo...

Recent field studies have revived the hypothesis that low self-esteem causes aggression. Accordingly, we reanalyzed the data from a previous experiment and conducted a new experiment to study direct physical aggression in the form of blasting a fellow participant with aversive noise. We also conducted a field study using a measure of indirect aggression in the form of a consequential negative e...

Introduction: Impact structures are unlike most geologic features because there commonly is little or no surface manifestation of their complex crater-filling stratigraphy. Further, many impact structures lie completely buried by as much as several hundred meters of sediment. Frequently, the only means of accessing tangible material from within such structures is by drilling. Of the 172 proven ...

The objectives of this study were to characterize change in surface properties of tetragonal zirconia polycrystals (TZP) after hydrophilic treatment, and to determine the effect of such changes on initial attachment of osteoblast-like cells. Roughened surfaces were produced by alumina-blasting and acid-etching. Hydrophilic treatment comprised application of immediately after blasting and acid-e...

Preliminary notes This paper aims to establish the parameters of optimization and geometrical improvements for the micro-geometry of solid carbide drills through the application of sand blasting process. The effects of sand blasting over the cutting edge and also upon the micro geometry of the tool body are to be taken into consideration. This process is one of the most common ones used in the ...