Exact Self-consistent Particle-like Solutions to the Equations of Nonlinear Scalar Electrodynamics in General Relativity

Exact self-consistent particle-like solutions with spherical and/or cylindrical symmetry to the equations governing the interacting system of scalar, electromagnetic and gravitational fields have been obtained. As a particular case it is shown that the equations of motion admit a special kind of solutions with sharp boundary known as droplets. For these solutions, the physical fields vanish and the space-time is flat outside of the critical sphere or cylinder. Therefore, the mass and the electric charge of these configurations are zero.Comment: 17 pages, Submitted to the International Journal of Theoretical Physic

Genetic variability of indels in the prolactin and dopamine receptor D2 genes and their association with the yield of allanto-amniotic fluid in Russian White laying hens

Currently, there is virtually no information on genetic factors affecting the yield of allanto amniotic fluid, which is the raw material for the production of human and animal vaccines. Association studies including this trait are beneficial for increasing productivity of a biotechnological line of chickens used for the production of ‘Clean Eggs’. We examined here a population of the Russian White breed for the effects of indels in the prolactin (PRL) and dopamine receptor D2 (DRD2) genes on the yield of extraembryonic fluid (YEF) and embryo weight at 12.5 days of development. A 24-bp insertion in the 5' flanking region of the PRL gene significantly (P<0.01) increases YEF in the embryos. The heterozygous embryos contained the highest YEF (9.6 mL) than that of the homozygous insertion (9.4 mL) and deletion embryos (8.4 mL). We also found a significant association (P<0.001) between the PRL genotypes and egg weight (EW). The results of the present study suggest a significant association between the PRL gene variation and quantitative traits in the Russian White chickens, contributing to a long-term programme on the effective use of the genetic potential of Russian gene pool breeds and populations of chickens

МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ ПРОЦЕССОВ ПЕРЕМЕШИВАНИЯ АРГОНОМ И НАСЫЩЕНИЯ УГЛЕРОДОМ СТАЛЕЙ В КОВШЕ

The mathematical model for dissolution process of a powder material in steel melt is proposed in the paper. The model permits to take into account mixing hydrodynamics on the basis of the Navier-Stokes equations. One of the industrial out-of-furnace treatment schemes taken as an example demonstrates the opportunities to model a carbon dissolution in a ladle.Предложена математическая модель процесса растворения порошкообразного материала в расплаве стали, позволяющая учитывать гидродинамику перемешивания на основе уравнений Навье - Стокса. На примере одной из схем промышленной внепечной обработки показаны возможности моделирования процесса растворения углерода в разливочном ковше

Comparative analysis of molecular RFLP and SNP markers in assessing and understanding the genetic diversity of various chicken breeds

Monitoring the genetic diversity of small populations is important with respect to conserving rare and valuable chicken breeds, as well as discovery and innovation in germplasm research and application. Restriction fragment length polymorphisms (RFLPs), the molecular markers that underlie multilocus DNA fingerprinting (MLDF), have historically been employed for this purpose, but over the past two decades, there has been an irreversible shift toward high-throughput single-nucleotide polymorphisms (SNPs). In this study, we conducted a comparative analysis of archived MLDF results and new data from whole-genome SNP genotyping (SNPg) among 18 divergently selected breeds representing a large sample of the world gene pool. As a result, we obtained data that fit the general concept of the phylogenetic distribution of the studied breeds and compared them with RFLP and SNP markers. RFLPs were found to be useful markers for retrospective assessment of changes in the genetic architecture and variability underlying the phenotypic variation in chicken populations, especially when samples from previous generations used for MLDF are unavailable for SNPg. These results can facilitate further research necessary to assess the possibility of extrapolating previous MLDF results to study the long-term dynamics of genetic diversity in various small chicken germplasm populations over time. In general, the whole-genome characterization of populations and breeds by multiple SNP loci will further form the basis for the development and implementation of genomic selection with the aim of effective use of the genetic potential of the domestic gene pool in the poultry industry

The BM@N spectrometer at the NICA accelerator complex

BM@N (Baryonic Matter at Nuclotron) is the first experiment operating and taking data at the Nuclotron/NICA ion-accelerating complex.The aim of the BM@N experiment is to study interactions of relativistic heavy-ion beams with fixed targets. We present a technical description of the BM@N spectrometer including all its subsystems.Comment: 34 pages, 47 figures, 6 table

Production of {\pi}+ and K+ mesons in argon-nucleus interactions at 3.2 AGeV

First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on {\pi}+ and K+ meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse momentum distributions, rapidity spectra and multiplicities of {\pi}+ and K+ mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.Comment: 29 pages, 20 figure

EXPERIENCE OF IMPLEMENTATION OF THE ALTERNATING STEEL BLOWING TECHNOLOGY IN CASTING LADLES AT OAO «BMZ»

It is shown that application of the alternating steel conducting technology in casting ladles at OAO “BMZ” has increased the degree of metal desulphurization by 5% as compared to the melting of standard technology

COMPLEX RECONSTRUCTION OF THE CONTINUOUS CASTING MACHINES OF BELARUSIAN STEEL WORKS

Set of activities performed by the machine for continuous casting mill № 3 has enhanced its productivity and also master a new product - continuous casting round billet for seamless drawn pipes in tube-rolling sho

INFLUENCE OF THE STEEL CHEMICAL COMPOSITION, STATE OF THE EQUIPMENT OF MNLZ AND TECHNOLOGICAL PARAMETERS OF CASTING ON APPEARANCE OF SURFACE AND INTERNAL DEFECTS OF CONTINUOUSLY CASTED SLUGS

Experience of operating of the section continuous casting machines of OAO “BMZ” shows that technologies dealing with industrial exploitation of these machines must solve problems on improvement of installations constructions, smelting technologies and out-of-furnace steel processing, selection of refractory materials, improvement of the billet crystallization process, metal protection from secondary oxidation, improvement of the billet quality, etc

REFERENCE SYSTEM FOR SOFT REDUCTION ON CONTINUOUS CASTING MACHINES AND THEIR IMPACT ON THE QUALITY OF MACRO-BLANKS

The application of the system of dynamic soft reduction on continuous casting machines is grounded. Their impact on the quality of macrostructure blanks is displayed