Fission time for the U + α reaction measured by the crystal blocking technique

The crystal blocking technique has been used to measure the total time of the induced fission process for the ²³⁵U + α reaction in the energy range of bombarding α-particles from 25.9 to 31.2 MeV. Experimental fission times observed in this reaction vary from 10⁻¹⁷ to 10⁻¹⁶ s, depending on the projectile energy. Together with the corresponding experimental data on angular anisotropy in the same reaction they were analyzed within the dynamic-statistical approach with allowance for the nuclear dissipation phenomenon and the double-humped fission barrier model. It was demonstrated that the time of induced fission at low excitation energies is sensitive to the nuclear dissipation magnitude.     

Investigation of characteristics of planar leaky-wave antenna arrays designed for broadside radiation

The results of computer simulation and experimental investigations of new planar leaky-wave antenna arrays designed for microwave and EHF bands and for the mode of radiation normal to the aperture plane have been presented. These arrays comprise single-layer shielded dielectric waveguides and metal-strip periodic diffraction gratings. The specified antennas ensure the radiation efficiency of no less than 50% and the gain of about 28–30 dB within the 3–4% frequency band.     

Methods for the manufacture of nonmetallic reference specimens for liquid-penetrant inspection

Methods for the manufacture of nonmetallic reference specimens that are used in liquid-penetrant inspection that allow one to produce flaws with an opening width of up to 1 μm are reported.     

Nanofabrication with Pulsed Lasers

An overview of pulsed laser-assisted methods for nanofabrication, which are currently developed in our Institute (LP3), is presented. The methods compass a variety of possibilities for material nanostructuring offered by laser–matter interactions and imply either the nanostructuring of the laser-illuminated surface itself, as in cases of direct laser ablation or laser plasma-assisted treatment of semiconductors to form light-absorbing and light-emitting nano-architectures, as well as periodic nanoarrays, or laser-assisted production of nanoclusters and their controlled growth in gaseous or liquid medium to form nanostructured films or colloidal nanoparticles. Nanomaterials synthesized by laser-assisted methods have a variety of unique properties, not reproducible by any other route, and are of importance for photovoltaics, optoelectronics, biological sensing, imaging and therapeutics.     

Gas-geochemistry approach to monitoring mining-induced genesis processes in the geological environment of the Upper Kama Potassium Salt Deposit

The article focuses at the gas-geochemistry profiling results at the Upper Kama Potassium Salt Deposit. It has been examined how the mining-caused deformations in the salt strata and abovesalt hydrocarbon strata influence the gas background in the subsurface layers. Efficiency of the gasgeochemistry approach to monitoring the mining-induced genesis processes in the studied geological environment has been proved.     

The data-acquisition system of a muon tomograph based on on-chamber electronics

The data-acquisition system of a muon tomograph based on the on-chamber electronics is described. Its advantages over the previously used system based on the electronics made to the VME-9U standard are considered. The hardware component and the software of the new data-acquisition system are presented.     

Semiconductor Yield Analysis and Multi-Chip Package(MCP) Dic Pairing Optimization using Machine Learning

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Analysis of disturbances in a leg of pitch-up maneuvering

A complex model of disturbances for a leg of pitch-up maneuvering by a carrier aircraft in launching a launch vehicle was constructed. The model incorporates the atmospheric disturbances (wind gust, jet wind, and density variations), errors in the motion parameters at the point of beginning the maneuver, and the deviation of the initial mass of a launcher aircraft from the design mass. Such a model is required for a priori estimation of the operational requirements (in normal load factor and attack angle), as well as for determination of possible initial errors in the motion of the launch vehicle due to the air launch. We present majority estimates of errors for the most unfavorable combination of disturbances and the results of statistical analysis for the disturbed-motion trajectories by the Monte Carlo method.