Non-dissipative drag of superflow in a two-component Bose gas

A microscopic theory of a non-dissipative drag in a two-component superfluid Bose gas is developed. The expression for the drag current in the system with the components of different atomic masses, densities and scattering lengths is derived. It is shown that the drag current is proportional to the square root of the gas parameter. The temperature dependence of the drag current is studied and it is shown that at temperature of order or smaller than the interaction energy the temperature reduction of the drag current is rather small. A possible way of measuring the drag factor is proposed. A toroidal system with the drag component confined in two half-ring wells separated by two Josephson barriers is considered. Under certain condition such a system can be treated as a Bose-Einstein counterpart of the Josephson charge qubit in an external magnetic field. It is shown that the measurement of the difference of number of atoms in two wells under a controlled evolution of the state of the qubit allows to determine the drag factor.Comment: 13 pages, 3 figures. This preprint is extended and substantially revised variant of related preprint cond-mat/040456

Graph-analytic engineering method of corrosion current calculation in multielectrode system

The calculation methods of corrosion current in multielectrode system have been analysed. The algorithm of graph-analytical engineering method of corrosion current calculation in multielectrode system including the principles of graphic and analytical calculation methods is presented. As an illustrative example the case with three electrodes (copper, iron, and aldrey) is considered

MANAGEMENT TECHNIQUES FOR REDUCING ADMINISTRATIVE BARRIERS WHEN PROVIDING STATE AND MUNICIPAL SERVICES IN THE RUSSIAN FEDERATION

The subject of the study is administrative barriers in the provision of public services to individuals and business entities in the Russian Federation. The article proposes methods of analysis of the quality of providing public and municipal services to the population and economic entities. The paper investigates the degree of openness of public authorities. The authors propose a systematic approach to the study of the causes and conditions of administrative barriers, as well as an effective universal system of measures designed to eliminate such barriers and improve the quality of the state’s response to public requests. The paper studied methods of combating administrative barriers in a practical application with the establishment of the main techniques and methods of public administration, the methodology for eliminating administrative barriers. The authors analyze the role of self-regulation, professional communities and social networks in removing administrative barriers

MANAGEMENT TECHNIQUES FOR IMPROVING THE QUALITY OF DECISION-MAKING BY OWNERS OF APARTMENT BUILDINGS ON THE CHOICE OF MANAGEMENT ORGANIZATION

The procedure for choosing the organization managing the apartment building is regulated in detail by legislation. However, the law, formally conforming to market principles, leaves the owners of residential premises in the house without any reasonable selection criteria. The wrong choice of a management company is fraught not only with economic losses, but also with safe living. At the same time, the ratings proposed for state accounting or statistics cannot be applied by owners to select the best candidate, since they have other goals. The limited applicability of these ratings and criteria systems has been argued in the article, and also well-grounded approaches and a new system of criteria necessary to resolve the selection problem have been proposed

EI of the Phosphotransferase System of Escherichia coli: Mathematical Modeling Approach to Analysis of Its Kinetic Properties

The mathematical model of the operation of the first enzyme of the Escherichia coli phosphotransferase system, EI, is proposed. Parameters of the kinetic model describing the operation of EI under different conditions are identified on the basis of a large amount of known experimental data. The verified model is employed to predict modes of operation of EI under both in vivo physiological conditions and in vitro nonphysiological conditions. The model predicts that under in vivo physiological conditions, the rate of phosphotransfer from EI to the second protein of the phosphotransferase system HPr by the dimer is much higher than by the monomer. A hypothesis is proposed on the basis of calculations that the transfer by a monomer plays a role in the regulation of chemotaxis. At submicromolar pyruvate concentration, the model predicts nonmonotonic dependence of the phosphotransfer rate on the substrate (PEP) concentration

The development of electrolytes for intermediate temperature solid oxide fuel cells

This report describes a number of experimental studies on the solid state electrolytes for intermediate temperature solid oxide fuel cells (IT-SOFCs): Ce1-xLnxO2-δ (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb), some multicomponent systems Ce1-xLnx/2Ln x/2O2-δ (x = 0 - 0.20; Ln = Sm, La, Gd and L'n = Dy, Nd, Y), some systems with simultaneous doping by rare earth and alkali earth elements Ce0.8(Sm1-xMx)0.2O2-δ (M = Ca, Sr; x = 0.0 - 1.0) and Ce0.8(Sm1-x-yBayMx)0.2O2-δ (M = Ca, Sr; x = 0, 0.15, 0.20; y = 0.05, 0.1). Two important aspects are emphasized: the effect of different dopants' ionic radius and concentration on the electrical properties of CeO2 based solid solutions and the influence of the method of preparation on the structural properties of ceria ceramics and the electrochemical performance of single SOFCs on their base. To describe the electrolytic properties of solid electrolytes the notation of the electrolytic domain boundary (EDB) - the critical oxygen partial pressure P*O2 at which the values of the electronic and ionic components of conductivity are equal, were calculated and presented. The interpretation of these data will lead to a better understanding of, subsequent improvements to and ultimately, the commercialization of IT-SOFCs in Russia. © 2014 WIT Press.International Journal of Safety and Security Engineering;International Journal of Sustainable Development and Planning;WIT Transactions on Ecology and the Environmen

A solution to the problem of clustered objects compact partitioning

The urgency of the study consists in the fact that an object arrangement topology of a distributed system is often nonuniform. Objects can be placed at different distances from each other, thus forming clusters. That is why solving the problem of compact partitioning into sets containing thousands of objects requires the most effective way to a better use of natural structuring of objects that form clusters. The aim of the study is the development of methods of compact partitioning of sets of objects presented as clusters. The research methods are based on applied theories of sets, theory of compact sets and compact partitions, and linear programming methods with Boolean variables. As a result, the paper offers the method necessary to analyze composition and content of clusters. It also evaluates cluster compactness, which results in the decision to include clusters into the sets of partitions. It addresses the problem of optimizing the rearrangement of objects between compact sets that form clusters, which is based on the criteria of maximizing the total compactness of sets. The problem is formulated in the class of objectives of linear programming methods with Boolean variables. It introduces the example of object rearrangement

Factors associated with long-term adverse cardiovascular events in patients with type 2 diabetes

Aim. To identify factors associated with long-term adverse cardiovascular events (CVEs) in patients with type 2 diabetes (T2D).Material and methods. The study included 94 T2D patients aged 40 to 65 years with or without early symptoms of heart failure (HF). Patients underwent clinical and laboratory investigations, 6-minute walk test (6MWT), and echocardiography. Concentration of N-terminal pro-brain natriuretic peptide (NT-proBNP) was determined. After 8,8±0,72 years of follow-up, the prevalence of following CVEs among patients were assessed: any-cause death, myocardial infarction, stroke, emergency myocardial revascularization, hospitalization due to decompensated HF. We assessed the relationship between the development of long-term CVEs in T2D patients and the initial characteristics using logistic regression model.Results. Over a period of 8,8±0,72 years, CVEs occurred in 34 out of 88 (38,6%) patients with T2D. The baseline 6MWT values were lower in patients with CVEs (391,8±56,2 m vs 418,8±53,9 m, p=0,04). Stable coronary artery disease (55,9% vs 27,8%, p=0,008), early-stage HF (61,8% vs 27,8%; p=0,0016) were more common among patients with CVEs. Patients with CVEs had higher median initial NT-proBNP (46,9 pg/ml vs 24,2 pg/ml, p=0,01) and mean left atrial (LA) size (4,5±0,6 cm vs 4,19±0,5 cm, p=0,04) levels. The logistic regression established following factors associated with long-term CVEs in patients with T2D: NT-proBNP level (p=0,05), LA size (p=0,01), and 6MWT results (p=0,002).Conclusion. The development of long-term CVEs in middle-aged T2D patients with or without early-stage HF is associated with an initially increased NT-proBNP levels, an increase in left atrial size, and a decrease in 6MWT values. Further prospective studies with larger samples are needed to identify other factors affecting outcome in patients with early signs of HF

Diabetes mellitus type 2: the relationship of baseline clinical, laboratory and echocardiographic parameters with long-term major adverse cardiovascular events

Background: Type 2 diabetes mellitus (T2DM) increases the risk of developing cardiovascular disease. The search for factors interrelated with the development of major adverse cardiovascular events (MACE) in patients with T2DM over a long period of observation is urgent.Aim: To reveal the relationship of clinical, laboratory and echocardiographic parameters with the development of long-term MACE in T2DM.Materials and methods: 94 patients with T2DM (mean age — 55,3 ± 5,5 years, 65% of women) without manifestations of moderate and severe chronic heart failure (CHF), impaired renal function, severe somatic pathology underwent a ­complete clinical and laboratory examination. Echocardiography and 6-minute walk test (6mwt) were performed. The plasma level of the N-terminal propeptide of natriuretic hormone B-type (NT-proBNP) was determined. The variability of fasting blood glucose and intraday glycemic variability were measured by calculating the standard deviation (SD) and the coefficient of variation (CV) of at least 3 blood glucose values for 3 days. Analysis of MACE (death from any cause, myocardial infarction, stroke, decompensation of CHF, myocardial revascularization for emergency indications) was performed after 8,8 ± 0,72 years (n=88). Patients with T2DM were divided into 2 groups — without MACE (group 1, n=54) and with MACE (group 2, n=34). The search for predictors of long-term MACE in T2DM was carried out using the method of logistic regression.Results: Initially, group 2 differed from group 1 in a longer duration of T2DM, a higher incidence of stable coronary heart disease (55,9% vs 27,8%, p = 0,008), a higher presence of albuminuria>30 mg/day (66,7% vs 37,3% , p=0,008), a higher presence of initial symptoms of CHF (67,8% vs 21,8%, p=0,001), greater fasting glucose variability (SD 2,07 mmol/l vs 1,2 mmol/l, p=0,003), greater intraday glucose variability (SD 2,3 mmol/l vs 1,6 mmol/l, p=0,001, CV 28,2% vs 18,8%, p=0,001), higher levels of NT-proBNP (46,9 pg/ml vs 24,2 pg/ml, p=0,012), larger left atrial size (4,4 cm vs 4,1 cm, p=0,039), shorter 6mwt distance. The logistic regression method revealed the parameters that are most interconnected with long-term MACE in T2DM: intraday glycemic CV (p=0,0012), left atrial size (p=0,02) and initial manifestations of CHF (p=0,03).Conclusion: The development of long-term MACE in T2DM is associated with an increase in glycemic variability, an increase in NT-proBNP level, an increase in the left atrial size, and a decrease in exercise tolerance. According to logistic regression data, the most significant indicators associated with adverse outcomes are an increase in intraday glycemic CV, an increase in the left atrial size, and the presence of initial symptoms of CHF