Comment on `Dynamical properties of small polarons'

We show that the conclusion on the breakdown of the standard small polaron theory made recently by E.V. deMello and J. Ranninger (Phys. Rev. B 55, 14872 (1997)) is a result of an incorrect interpretation of the electronic and vibronic energy levels of the two-site Holstein model. The small polaron theory, when properly applied, agrees well with the numerical results of these authors. Also we show that their attempt to connect the properties of the calculated correlation functions with the features of the intersite electron hopping is unsuccessful.Comment: To appear in Phys. Rev.

Comment on “Dynamical properties of small polarons”

We show that the conclusion on the breakdown of the standard small polaron theory made recently by E. V. de Mello and J. Ranninger [Phys. Rev. B 55, 14 872 (1997)] is a result of an incorrect interpretation of the electronic and vibronic energy levels of the two-site Holstein model. The small polaron theory, when properly applied, agrees well with the numerical results of these authors. Also we show that their attempt to connect the properties of the calculated correlation functions with the features of the intersite electron hopping is unsuccessful

The intellectual information system for management of geological and technical arrangements during oil field exploitation

The intellectual information system for management of geological and technical arrangements during oil fields exploitation is developed. Service-oriented architecture of its software is a distinctive feature of the system. The results of the cluster analysis of real field data received by means of this system are shown

Estimate of the Sources of Plutonium-Containing Wastes Generated from MOX Fuel Production in Russia

In Russia, mixed oxide (MOX) fuel is produced in a pilot facility ''Paket'' at ''MAYAK'' Production Association. The Mining-Chemical Combine (MCC) has developed plans to design and build a dedicated industrial-scale plant to produce MOX fuel and fuel assemblies (FA) for VVER-1000 water reactors and the BN-600 fast-breeder reactor, which is pending an official Russian Federation (RF) site-selection decision. The design output of the plant is based on a production capacity of 2.75 tons of weapons plutonium per year to produce the resulting fuel assemblies: 1.25 tons for the BN-600 reactor FAs and the remaining 1.5 tons for VVER-1000 FAs. It is likely the quantity of BN-600 FAs will be reduced in actual practice. The process of nuclear disarmament frees a significant amount of weapons plutonium for other uses, which, if unutilized, represents a constant general threat. In France, Great Britain, Belgium, Russia, and Japan, reactor-grade plutonium is used in MOX-fuel production. Making MOX-fuel for CANDU (Canada) and pressurized water reactors (PWR) (Europe) is under consideration in Russia. If this latter production is added, as many as 5 tons of Pu per year might be processed into new FAs in Russia. Many years of work and experience are represented in the estimates of MOX fuel production wastes derived in this report. Prior engineering studies and sludge treatment investigations and comparisons have determined how best to treat Pu sludges and MOX fuel wastes. Based upon analyses of the production processes established by these efforts, we can estimate that there will be approximately 1200 kg of residual wastes subject to immobilization per MT of plutonium processed, of which approximately 6 to 7 kg is Pu in the residuals per MT of Pu processed. The wastes are various and complicated in composition. Because organic wastes constitute both the major portion of total waste and of the Pu to be immobilized, the recommended treatment of MOX-fuel production waste is incineration or calcination, alkali sintering, and dissolution of sintered products in nitric acid. Insoluble residues are then mixed with vitrifying components and Pu sludges, vitrified, and sent for storage and disposal. Implementation of the intergovernmental agreement between Russia and the United States (US) regarding the utilization of 34 tons of weapons plutonium will also require treatment of Pu containing MOX fabrication wastes at the MCC radiochemical production plant

Исследование теплообмена и гидравлических сопротивлений регенеративных воздухоподогревателей новой конструкции

Results of experimental and theoretical research of heat exchange and hydraulics of cast-iron lattice stuffing of regenerative rotating air heater of new design are given in the paper. Criterial dependences of heat exchange and pressure losses on medium velocity have been obtained. Представлены результаты экспериментальных и теоретических исследований теплообмена и гидравлики чугунной решетчатой набивки регенеративного вращающегося воздухоподогревателя новой конструкции. Получены критериальные зависимости теплоотдачи и гидравлических сопротивлений от скорости движения среды

Опыт применения натрия пирофосфата при оксалатном нефролитиазе в эксперименте

The aim of the investigation was studying sodium pyrophosphate’s effect on experimental oxalate nephrolithiasis.Experimental nephrolithiasis modeling by using of 1% ethylenglycole’s solution as a drink for rats during 6 weeks. First group was control. In the second group since the third week was being administrated sodium pyrophosphate in dose 2 g/kg. Was detecting parameters of kidney’s function, markers enzymes activity, was carried out morphological researches.It was concluded that sodium pyrophosphate’s therapy reduce experimental oxalate nephrolithiasis.Изучено влияние натрия пирофосфата на течение экспериментального оксалатного нефролитиаза.Экспериментальный нефролитиаз моделировался у двух групп крыс путем потребления в течение 6 нед 1%-го раствора этиленгликоля в виде питья. Первая группа являлась контрольной. Во второй группе начиная с 3-й нед ежедневно вводился внутрь натрия пирофосфат в дозе 2 г/кг массы тела. Осуществлялось определение показателей экскреторной функции почек, измерение активности маркерных ферментов, а также морфометрическое исследование почечных срезов.Установлено, что натрия пирофосфат существенно облегчает течение экспериментального нефролитиаза

CMS physics technical design report : Addendum on high density QCD with heavy ions

Peer reviewe