Production of exotic isotopes in complete fusion reactions with radioactive beams

The isotopic dependence of the complete fusion (capture) cross section is analyzed in the reactions $^{130,132,134,136,138,140,142,144,146,148,150}$Xe+$^{48}$Ca with stable and radioactive beams. It is shown for the first time that the very neutron-rich nuclei $^{186-191}$W can be reached with relatively large cross sections by complete fusion reactions with radioactive ion beams at incident energies near the Coulomb barrier. A comparison between the complete fusion and fragmentation reactions for the production of neutron-rich W and neutron-deficient Rn isotopes is performed.Comment: 13 pages, 6 figures, accepted in PR

Op\u27i͡ani͡ela, Op. 150

https://scholarexchange.furman.edu/periphery-kharbintsy2/1018/thumbnail.jp

Atmospheric response to the observed increase of solar UV radiation from solar minimum to solar maximum simulated by the University of Illinois at Urbana-Champaign climate-chemistry model

The University of Illinois at Urbana-Champaign general circulation model with interactive photochemistry has been applied to estimate the changes in ozone, temperature and dynamics caused by the observed enhancement of the solar ultraviolet radiation during the 11-year solar activity cycle. Two 15-yearlong runs with spectral solar UV fluxes for the minimum and maximum solar activity cases have been performed. It was obtained that due to the imposed changes in spectral solar UV fluxes the annual-mean ozone mixing ratio increases 3% over the southern middle latitudes in the upper stratosphere and 2% in the northern lower stratosphere. The model also shows a statistically significant warming of 1.2 K in the stratosphere and an acceleration of the polar-night jets in both hemispheres. The most pronounced changes were found in November and March over the Northern Hemisphere and in September-October over the Southern Hemisphere. The magnitude and seasonal behavior of the simulated changes resemble the most robust features of the solar signal obtained from observational data analysis; however, they do not exactly coincide. The simulated zonal wind and temperature response during late fall to early spring contains the observed downward and poleward propagation of the solar signal, however its structure and phase are different from those observed. The response of the surface air temperature in December consists of warming over northern Europe, USA, and eastern Russia, and cooling over Greenland, Alaska, and central Asia. This pattern resembles the changes of the surface winter temperature after a major volcanic eruption. Model results for September-October show an intensification of ozone loss by up to 10% and expansion of the ozone hole toward South America. Copyright 2004 by the American Geophysical Union

Description of a new species of Chrysina Kirby, 1828 (Coleoptera: Scarabaeidae: Rutelinae) from resplendens group, based on morphological characters and mtDNA COX I molecular marker

A new species of the genus Chrysina Kirby, 1828 is decribed from Panama. Chrysina kalinini sp.n. is related to Chrysina resplendens (Boucard, 1875) in habitus, male genitalia morphology and mtDNA COX I molecular marker). The two closely related species differ in the shape of pronotum, mesosternal process and male genitalia. mtDNA COI molecular marker analysis gives a reliable distance for the compared species

Climate/chemistry effects of the Pinatubo volcanic eruption simulated by the UIUC stratosphere/troposphere GCM with interactive photochemistry

The influence of the sulfate aerosol formed following the massive Pinatubo volcanic eruption in June 1991 on the chemical composition, temperature, and dynamics of the atmosphere has been investigated with the University of Illinois at Urbana-Champaign (UIUC) stratosphere-troposphere General Circulation Model (GCM) with interactive photochemistry (ST-GCM/PC). Ensembles of five runs have been performed for the unperturbed (control) and perturbed (experiment) conditions. The simulated repartitioning within the chlorine and nitrogen groups, as well as the ozone changes, are in reasonable quantitative agreement with observations and theoretical expectations. The simulated ozone changes in the tropics reveal the ozone mixing ratio decreases below 28 km and increases in the stratosphere above this level. However, these changes are not statistically significant in the lowermost stratosphere. The simulated total ozone loss reached 15% over the northern middle and high latitudes in winter and early spring. However, the simulated changes are statistically significant only during early winter. The magnitude of the simulated total ozone depletion is generally less than that observed, but some members of the experiment ensemble are in better agreement with the observed ozone anomalies. The model simulates a pronounced stratospheric warming in the tropics, which exceeds the warming derived from observations by 1-2 K. The model matches well the intensification of the polar-night jet (PNJ) in December 1991 and 1992, the statistically significant cooling of the lower stratosphere and warming of the surface air in boreal winter over the United States, northern Europe, and Russia, and the cooling over Greenland, Alaska, and Central Asia. Copyright 2002 by the American Geophysical Union

NUMERICAL MODELING ELECTRICAL HEATING OF LAUNDER FOR CASTING OF MOLTEN ALUMINIUM

В докладе рассмотрены некоторые вопросы повышения эффективности системы предварительного нагрева встроенными электронагревателями металлотракта с использованием средств численного моделирования в пакете ANSYS-CFX (Академическая лицензия № 00144095).The report addresses some of the issues of improving the preheating system with a built-in electric heaters for casting molten metal using a numerical modeling in a software package ANSYS-CFX (Academic license № 00144095)

Анализ возможности увеличения дальности стрельбы перспективных управляемых ракет для отечественных реактивных систем залпового огня

The article considers a possibility to increase a flying range of the perspective rockets equipped with the control unit with aerodynamic controllers for the multiple launch rocket systems “Smerch”.To increase a flying range and reduce a starting mass of the rocket, the paper studies a possibility to replace the single-mode rocket engine used in the solid-fuel rocket motor for the direct-flow propulsion jet engine (DFPJE) with not head sector air intakes. The DFPJE is implemented according to the classical scheme with a fuel charged in the combustion chamber. A separated solid propellant starting accelerator provides the rocket acceleration to reach a speed necessary for the DFPJE to run.When designing the DFPJE a proper choice of not head air intake parameters is one of the most difficult points. For this purpose a COSMOS Flow Simulation software package and analytical dependences were used to define the following: a boundary layer thickness where an air intake is set, maximum permissible and appropriate angles of attack and deviation angles of controllers at the section where the DFPJE works, and some other parameters as well.Calculation of DFPJE characteristics consisted in determining parameters of an air-gas path of the propulsion system, geometrical sizes of the pipeline flow area, sizes of a fuel charge, and dependence of the propulsion system impulse on the flight height and speed. Calculations were performed both in thermodynamic statement of problem and in using software package of COSMOS Flow Simulation.As a result of calculations and design engineering activities the air intake profile is created and mass-dimensional characteristics of DFPJE are defined. Besides, calculations of the starting solid fuel accelerator were carried out. Further design allowed us to create the rocket shape, estimate its mass-dimensional characteristics, and perform ballistic calculations, which proved that achieving a range of 120 km for the rocket is possible.Thus, with restrictions imposed by the control unit, application of DFPJE allows us to increase a flying range of the rocket more than by 30% in comparison with the existing domestic samples.Предложен способ повышения дальности стрельбы перспективной управляемой ракеты для отечественной реактивной системы залпового огня за счет применения прямоточного воздушно-реактивного двигателя и блока управления. Разработана компоновочная схема ракеты и проведены расчеты прямоточного воздушно-реактивного двигателя с использованием методов математического моделирования и пакетов прикладных программ, подтверждающие возможность реализации предложенного технического решения. Получены конкретные значения повышения дальности стрельбы и показана возможность улучшения характеристик ракеты для отечественной реактивной системы залпового огня до уровня зарубежных аналогов. DOI: 10.7463/aersp.0315.078198