Prediction of environmental risks from explosions based on a set of coupled geophysical fields

This paper presents the results of experimental studies and numerical calculations of weather-dependent ecological risks to social infrastructure facilities from the effects of powerful infrasonic vibrations generated by man-made and natural explosions. The results were obtained by applying an original ecologically safe approach developed by the authors and involving the use of seismic vibrators as sources simulating explosions but having much less power compared to the explosions. Such sources generate both seismic and acoustic (seismoacoustic) vibrations with precision metrological power and frequency-time characteristics, which, in contrast to explosions, ensures high reproducibility of research results. Results comparable to explosions are achieved due to the energy accumulation of weak vibroseismoacoustic signals. The propagation of infralow-frequency wave fields is studied depending on weather conditions and taking into account the effect of heterogeneity of the atmosphere. The results of the experiments are compared with those of numerical calculations.     

CuBr Laser Excited by a Capacitively Coupled Longitudinal Discharge

The paper presents the study of the CuBr laser energy characteristics using capacitively coupled discharge excitation. We have studied the effect of the addition of HBr on laser performance for gas discharge tubes of different bore diameter at various input power conditions. When adding HBr pulse and average output power as well as laser efficiency more than double increase due to the shortening of the current pulse rising time and its duration. The total maximum average lasing power of 3.7 W was obtained at 0.27% efficiency. In the paper, we also notice that when adding admixtures capacitively coupled discharge pumping is superior to traditional glow discharge pumping.     

Simulation of the motion of an individual erythrocyte in a narrow capillary

The motion of an individual deformable erythrocyte in a capillary whose diameter is smaller than the particle diameter has been considered. The problem formulation is based on the Lighthill-Fitzgerald model. The erythrocyte drag at a given pressure difference acting on its frontal surface has been determined. The dependences of the relative drag on the dimensionless parameters of the model as well as on the minimum thickness of the lubricating layer and the rate of motion of the erythrocyte on the pressure at opposite edges of the cell have been obtained. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 5, pp. 5–9, September–October, 2005.     

Pyrolysis of Complexes of Metallosulphophthalocyanines with Chitosan for Obtaining Graphite-Like Structures

Journal of Inorganic and Organometallic Polymers and Materials - The pyrolysis of chitosan and its polymeric complexes with metal phthalocyanines was studied by thermochemical and spectral methods....     

Molecular characteristics of polymerized surfactants: influence of introduced crosslinking agent and monomer concentration

Polymerizable surfactants are currently attracting considerable interest due to their promising applications in various fields of science and engineering. The present work is devoted to studies of crosslinked poly(N‐acryloyl‐11‐aminoundecanoic acid) and sodium poly(N‐acryloyl‐11‐aminoundecanoate) that were synthesized in reaction mixtures of various compositions (i.e. with different amounts of a crosslinking agent and monomer concentrations). The products were studied by viscometry, dynamic light scattering, sedimentation velocity ultracentrifugation, flow birefringence as well as equilibrium and non‐equilibrium electric birefringence. It was established that both intramolecular and intermolecular crosslinks are formed in the polymerization process. Molecular optical methods and electro‐optical methods were used to determine the sizes of macromolecules with intramolecular crosslinks and the structures containing intermolecular crosslinks that were prepared at various concentrations of the monomer and the crosslinking agent. It was demonstrated that a simultaneous decrease in the amount of the crosslinking agent and decrease in the initial monomer concentration during the synthesis resulted in a reduction in the number of intramolecular crosslinks and molecular masses of the synthesized crosslinked macromolecules. © 2019 Society of Chemical Industry