This paper presents on-line tool breakage detection of small diameter drills by monitoring the AC servo motor current. The continuous wavelet transform was used to decompose the spindle AC servo motor current signal and the discrete wavelet transform was used to decompose the feed AC servo motor current signal in time–frequency domain. The tool breakage features were extracted from the decompos...

Breakage of instruments during laparoscopic surgery is rare. However, when it does occur, locating and retrieving the broken part of the instrument can be cumbersome. Moreover, inability to do so may carry serious medicolegal implications. We report a patient in whom the tip of a fascial closure device broke during laparoscopic surgery. This was located by intraoperative fluoroscopy and retriev...

Abstract Drilling and blasting methods have been used as a common driving technique for shallow-hole in rock roadways. With the advent of digital electronic detonators need increased production efficiency, traditional design is no longer suitable deep hole blasting. In this paper, disperse charge cut method was proposed to address issues low excavation depth high block rate undercut First, mode...

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 ...

This paper describes some computer simulations of the breakage induced in a two-dimensional particle bed by the descent of a single Ž large grinding ball. These are approximate experiments related to ball-milling that are tractable by the simulation technique i.e., involve . relatively few particles . As a result of the impact of the grinding ball, the particles in the bed are broken andror sca...

This study evaluates in vitro the effects of UVB irradiation on three cellular compartments of a shallow water coral species. Coral tissues were dissociated by Ca(2+)-Mg(2+)-free artificial seawater. Cell suspensions were divided into the major cellular compartments (animal cells, algal cells, holobiont entities) by sucrose gradient and then by detergent treatments. Cell fractions were irradiat...

RecA protein promotes an unexpectedly efficient DNA strand exchange between circular single-stranded DNA and duplex DNAs containing short (50-400-base pair) heterologous sequences at the 5' (initiating) end. The major mechanism by which this topological barrier is bypassed involves DNA strand breakage. Breakage is both strand and position specific, occurring almost exclusively in the displaced ...

In this study, a numerical triaxial compression test was carried out to investigate the influence of contact friction on the breakage behavior of brittle granular materials using the 3D discrete element method. An commercial software named Particle Flow Code 3D (PFC3D) was applied to undertake these simulations. The cubic numerical model was 30mm wide, 30mm long, and 30mm high, and contained 56...

The girder of self-anchored suspension bridge is subjected to large compression force applied by main cables. So, serious damage of the girder due to breakage of hangers may cause the collapse of the whole bridge. With the time increasing, the hangers may break suddenly for their resistance capacities decrease due to corrosion. Using nonlinear static and dynamic analysis methods and adopting 3D...

Extensive, programmed chromosome breakage occurs during formation of the somatic macronucleus of ciliated protozoa. The cis-acting signal directing breakage has been most rigorously defined in Tetrahymena thermophila, where it consists of a 15-bp DNA sequence known as Cbs, for chromosome breakage sequence. We have identified sequences identical or nearly identical to the T. thermophila Cbs at s...