Recovery of nickel from hydrate pulps at amino carboxylic cationites

Regularities of the sorption of nickel from hydrate pulps using amino carboxylic cationites ANKB-35, S 930, and TP 207 are investigated. Kinetic curves and sorption isotherms for these cationites are constructed. It is revealed that it is reasonable to absorb nickel from pulps at pH = 4-5. The desorption of nickel from cationites is investigated. It is shown that cationite TP 207 possesses the maximal sorption capacity. © 2013 Allerton Press, Inc

Bioleaching of low grade uranium ore containing pyrite using A. ferrooxidans and A. thiooxidans

A process of uranium extraction from ore containing 3.1 % pyrite by bacterial leaching was investigated in shaken flasks during 90 days. The highest uranium recovery amounting to 85.1 % was obtained using binary mixture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans that was exceeding results obtained by traditional acid leaching technique up to 27 %. High uranium recovery was founded to be due to the high degree of pyrite dissolution that can be readily achieved by bacterial leaching (up to 98.0 %). © 2012 Akadémiai Kiadó, Budapest, Hungary

Algorithmic means implementing requirements reliability entering information into the onboard control computing system in rocket "SOYUZ-2"

Рассмотрены предъявляемые требования по надежности к режиму ввода программного обеспечения в бортовую цифровую вычислительную систему ракеты-носителя «Союз-2». Произведен анализ существующих программно-алгоритмических средств обеспечения предъявленных требований по надежности. Из-за большого количества используемых элементов и возрастания объемов хранимой информации возникает ряд проблем связанных с реализацией надежного ввода. Основные проблемами в данном режиме это большая вероятность возникновения двух кратных искажений информации и внешнее воздействие на линии связи. В связи с этим представлены доработанные программно-алгоритмические средства обеспечения надежности режима ввода программного обеспечения, с учетом особенностей и возможностей бортовой цифровой вычислительной системы ракеты-носителя «Союз-2», существенно повысившие надежность режима ввода и системы в целом.Discussed requirements to in terms of reliability to the input mode software onboard digital computer system rocket "Soyuz-2". The analysis of existing software and algorithmic means to ensure demand under reliability. Due to the large number of elements used and increasing volumes of stored information, a number of problems associated with the implementation of a reliable input. The main problem in this mode is a large probability of two multiple misstatements and external influence on the link. In this regard, presented the modified software and algorithmic means of securing the input mode information, taking into account the characteristics and capabilities of the onboard digital computer system carrier rocket "Soyuz-2", will significantly increase the reliability of the input mode and the system as a whole

Software debugging methods of the multiprocessor computing system

В работе определяются проблемы, возникающие при создании и отладке программного обеспечения для многопроцессорных систем. Рассматривается метод автоматического обнаружения ошибок в системах с распределенной памятью, а также метод отладки с использованием интерфейса JTAG. Предлагается методика комплексной отладки ошибок двух родов в многопроцессорных системах управления.The paper represents issues in creation and debugging of software for multiprocessor systems. The method of automatic error detection in systems with distributed memory is examined. The debugging method using JTAG is described. The paper also deals with the complex debugging technique of the two types of errors in multiprocessor control systems

Development of SO 2-O 2 system as an oxidant at uranium leaching processes

The oxidation of Fe 2+ in uranium leaching solutions with gaseous mixture of SO 2 and air has been studied. The variables studied include H 2SO 4 concentration, temperature, SO 2 concentration and time. The oxidation rate was founded to increase greatly with an increase in the solution temperature. The almost total oxidation of Fe 2+ is readily achieved at 95 °C. By appropriately adjusting the temperature of solution and SO 2/O 2 in the gas, oxidation of ferrous ion and generation of sulphuric acid can be carried out. It was founded that solutions produced by such oxidation processing are very suitable for the uranium ore leaching. © 2012 Akadémiai Kiadó, Budapest, Hungary