Electric breakdown and explosive decomposition of PETN monocrystals initiated by electron beam

The glowing, fracture, and explosive decomposition of pentaerythritol tetranitrate (PETN) monocrystals initiated by a nanosecond pulsed high-current electron beam (HEB) have been experimentally studied. It is established that crystallographically oriented electric (strimer) discharges are formed within the electron-beam action range in the crystal in a broad range of energy densities (0.1?C75.0 J/cm²). Threshold energy density for the electric breakdown, fracture, and explosive decomposition of PETN monocrystals under HEB action have been determined. In contrast to pressed PETN samples, monocrystals exhibit incomplete explosion with expansion of the majority of unreacted substance.     

Detection of Cylindrical and Spherical Surfaces and Determining Their Parameters in Segmentation of Range Images

Journal of Computer and Systems Sciences International - An analytical solution of the problem of estimating the coordinates of the axis of a cylindrical surface and its radius by processing range...     

Doppler Selection of Ground Objects Moving with Random Variations of the Velocity Vector’s Orientation

Journal of Computer and Systems Sciences International - The problem of the radar search-detection-classification of objects on the ground moving with random changes of the direction of the...     

A rapid 2-MV impulse generator

A high-voltage nanosecond impulse generator was developed and tested in order to create electromagnetic impulses (EMIs) in a given area. Tests revealed the characteristics of the generator??s output impulse: the rise (at a level 0.1?C0.9) is about 3.2 ns, the length is 27 ns at half-deflation, and the magnitude is 2 MV. The generator is used to test large-size equipment for tolerance to industrial EMIs.     

A set of test and measuring equipment in the field of electromagnetic compatibility

Instrumental support of scientific research and EMC tests are considered. Sample generators of field and conducted interferences of microsecond, nanosecond, and subnanosecond ranges are given. The structure of an optoelectronic electromagnetic field gage is described. Characteristics of TEM and GTEM chambers are given.     

A method for isolation of sequences missing in one of two related genomes

We describe a novel technique for isolation of sequences that are present in one genome (tracer), but absent in another (driver). Tracer DNA, cleaved with Sau 3A and capped with a single stranded PCR adapter, is allowed to hybridize with an excess of sheared biotinylated driver; biotinylated DNA and its hybrids with the tracer are removed by phenol/chloroform extraction after incubation with streptavidin. After several rounds of subtraction the ends of self-annealed tracer molecules from the nonextractable fraction are filled-in with Tag polymerase and amplified, using the single stranded PCR adapter as a primer. The method has been applied to purification of fragments from a 2.9 kb plasmid added to E. coli DNA at equimolar quantity. Plasmid derived fragments (250-1000 bp), initially comprising 1/1400th part of tracer DNA, were purified to homogeneity after two rounds of subtraction followed by PCR.