Subtraction method for NLO corrections in Monte-Carlo event generators for Z boson production

We use a subtraction method to construct NLO corrections in a Monte-Carlo event generator for the case of vector boson production in Drell-Yan processes. Our calculations are carried out both for the Bengtsson-Sjostrand-van Zijl (BSZ) algorithm and for a modified algorithm proposed by Collins. In the case of the modified algorithm, we compute the relation between the parton distribution functions and the ones in the MSbar scheme; this relation is the same as the corresponding relation for DIS. For the BSZ algorithm, we show that there is no simple relation.Comment: 16 pages, 4 figures, JHEP class. Misprints correcte

Imbalance of the hemocoagulation and fibrinolysis systems under conditions of diabetes mellitus complicated by acute circulatory disturbance in the pool of carotid arteries of rats

Introduction. Both cerebral ischemia and diabetes mellitus (DM) are evidenced to be associated with hypercoagulation state, though today the facts concerning hemocoagulation condition with diabetes mellitus complicated by cerebral ischemia-reperfusion are lacking.    The aim of the study. To examine the dynamics of interrelations between the pro-, anticoagulant and fibrinolytic parameters in rats with diabetes mellitus complicated by acute cerebral circulatory disturbance.   Results. At the early ischemic-reperfusion period activation of the pro-coagulant potential (decrease of prothrombin and thrombin time and increase of fibrinogen content) is found to be balanced by a reduced activity of XIII factor and an increase activity of antithrombin III in rats without diabetes mellitus.  At the same period in rats with diabetes increase of the pro-coagulant potential is accompanied by the activation of XIII factor and a reduced activity of antithrombin III promoting clot formation. On the 12th day of the observation the parameters of the coagulation chain in the hemostasis system and antithrombin III return to the level of the control animals in rats without diabetes, but in rats with diabetes the factors of intensification of a thrombotic risk remain activated. At the early and late ischemic-reperfusion periods the parameters of blood fibrinolytic activity increase in rats without diabetes; in animals with diabetes mellitus the parameters of fibrinolytic activity remain without changes at the early period of observation (except decrease of a potential plasminogen activity), and they decrease on the 12th day of the post-ischemic period, which deteriorates conditions of thrombolysis.   Conclusions. Complication of diabetes mellitus by ischemic-reperfusion lesion of the brain results in imbalance in the hemocoagulation system at the expense of intensification of pro-coagulant mechanisms, and promotes inhibition of fibrinolytic processes with advanced changes in the dynamics of observation.   &nbsp

Benefits and drawbacks of applying innovative teaching techniques of ed tpa for training tourism specialists in English

Current paper analyzes positive foreign experience of practical usage of one of the modern teaching developments, such as Ed TPA products, in the process of foreign language training of Bachelors of Tourism in domestic higher educational institutions. Particular attention have been paid to the organizational issues and planning segment of the Ed TPA structure as being decisive for further successful implementation. Recent segment is remarkable for its providing updated background for literacy development through language, as well as standard frameworks, authentic for both: well-experienced educators and beginning instructors. Within this practice, importance of the connection between student’s previous level of knowledge and new learnings has been proved. Illustrations of rubricating and differentiation of levels, corresponding to students’ learning orientation, have been evaluated as productive outcomes. Besides, general benefits and drawbacks of applying technologies within foreign language teaching have been studied. In particular, it has been verified that synchronous and asynchronous communication between students and teachers provides definite positive impact on students’ motivation, comprehensive activity and encourages them for constant, everlasting learning process. Consequently, innovative educational techniques and technological applications achieve a number of positive goals, although some structural shortcomings (such as lack of explanation and concretization) still takes place, as well as lack of control over online students’ performance and content representing is obvious

Absence of Conventional Spin-Glass Transition in the Ising Dipolar System LiHo_xY_{1-x}F_4

The magnetic properties of single crystals of LiHo_xY_{1-x}F_4 with x=16.5% and x=4.5% were recorded down to 35 mK using a micro-SQUID magnetometer. While this system is considered as the archetypal quantum spin glass, the detailed analysis of our magnetization data indicates the absence of a phase transition, not only in a transverse applied magnetic field, but also without field. A zero-Kelvin phase transition is also unlikely, as the magnetization seems to follow a non-critical exponential dependence on the temperature. Our analysis thus unmasks the true, short-ranged nature of the magnetic properties of the LiHo_xY_{1-x}F_4 system, validating recent theoretical investigations suggesting the lack of phase transition in this system.Comment: 5 pages, 4 figure

Curracurrong: a stream processing system for distributed environments

Advances in technology have given rise to applications that are deployed on wireless sensor networks (WSNs), the cloud, and the Internet of things. There are many emerging applications, some of which include sensor-based monitoring, web traffic processing, and network monitoring. These applications collect large amount of data as an unbounded sequence of events and process them to generate a new sequences of events. Such applications need an adequate programming model that can process large amount of data with minimal latency; for this purpose, stream programming, among other paradigms, is ideal. However, stream programming needs to be adapted to meet the challenges inherent in running it in distributed environments. These challenges include the need for modern domain specific language (DSL), the placement of computations in the network to minimise energy costs, and timeliness in real-time applications. To overcome these challenges we developed a stream programming model that achieves easy-to-use programming interface, energy-efficient actor placement, and timeliness. This thesis presents Curracurrong, a stream data processing system for distributed environments. In Curracurrong, a query is represented as a stream graph of stream operators and communication channels. Curracurrong provides an extensible stream operator library and adapts to a wide range of applications. It uses an energy-efficient placement algorithm that optimises communication and computation. We extend the placement problem to support dynamically changing networks, and develop a dynamic program with polynomially bounded runtime to solve the placement problem. In many stream-based applications, real-time data processing is essential. We propose an approach that measures time delays in stream query processing; this model measures the total computational time from input to output of a query, i.e., end-to-end delay

Modelo de gestión del conocimiento para departamentos académicos

La Gestión del Conocimiento abarca un conjunto de procesos que administra el conocimiento de las organizaciones. Logra aumentar la creatividad y garantizar el éxito organizacional, ya que se fundamenta en el recurso más valioso con que actualmente cuentan las instituciones: el conocimiento o capital intelectual. Existen diversos modelos de Gestión del Conocimiento para el ámbito empresarial que indican cómo medir y optimizar el capital humano y el capital tecnológico de una organización. Sin embargo, en las organizaciones sin fines de lucro los modelos son escasos. Más aún, en el contexto educativo, no se dispone de modelos de Gestión de Conocimiento que mejoren la eficacia y la eficiencia de las instituciones. El objetivo de este trabajo consiste en proponer un Modelo de Gestión de Conocimiento para Departamentos Académicos, tomando como estudio de caso el Departamento de Informática de la Universidad Nacional de Santiago del Estero. Con tal fin, se presenta el Mapa de Conocimientos del dominio, elaborado con un lenguaje simbólico propio. Luego, se presenta el modelo construido tomando como base el modelo de comunidades virtuales, el modelo Intellectus y los conocimientos del dominio.Knowledge Management involves a set of processes that deals with the knowledge of the organizations. It increases organizational creativity and guarantees organizational success because it is based in the most valuable resource the institutions have nowadays: knowledge or intellectual capital. Although several models of Knowledge Management for enterprise context are available -that measures and optimizes human and technological capital, there are few models for non profit organizations. Moreover, there is no available model for educational context to improve organizational effectiveness and efficiency. The main objective of this paper is to propose a Knowledge Management Model for Academic Departments. This work is a partial result of a case study research developed at the Informatics Department of the National University of Santiago del Estero. Previously, the Knowledge Domain Map is presented, which was carried out using an own symbolic language. Then, the new model is proposed, based on the ‘virtual communities’ model, on the Intellectus model and on the Knowledge Domain Map.VI Workshop de Tecnología Informática Aplicada en EducaciónRed de Universidades con Carreras en Informática (RedUNCI

WKB approximation in deformed space with minimal length

The WKB approximation for deformed space with minimal length is considered. The Bohr-Sommerfeld quantization rule is obtained. A new interesting feature in presence of deformation is that the WKB approximation is valid for intermediate quantum numbers and can be invalid for small as well as very large quantum numbers. The correctness of the rule is verified by comparing obtained results with exact expressions for corresponding spectra.Comment: 13 pages Now it is avaible at http://stacks.iop.org/0305-4470/39/37

A numerical analysis of non-linear contact tasks for the system of plates with a bolted connection and a clearance in the fixture

Робота присвячується аналізу геометрично нелінійних контактних задач для системи смуг. Особливості представленої задачі полягають у досліджен- ні напружено-деформованого стану двох смуг, сполучених болтовим кріпленням із зазором і навантажених рівномірно розподіленим по верхній кромці поперечним зусиллям. У цій постановці задачі присутні геометрична і структурна нелінійності. Отримано основні закономірності напружено-деформованого стану елементів силосі

Formulation of the Spinor Field in the Presence of a Minimal Length Based on the Quesne-Tkachuk Algebra

In 2006 Quesne and Tkachuk (J. Phys. A: Math. Gen. {\bf 39}, 10909, 2006) introduced a (D+1)-dimensional $(\beta,\beta')$-two-parameter Lorentz-covariant deformed algebra which leads to a nonzero minimal length. In this work, the Lagrangian formulation of the spinor field in a (3+1)-dimensional space-time described by Quesne-Tkachuk Lorentz-covariant deformed algebra is studied in the case where $\beta'=2\beta$ up to first order over deformation parameter $\beta$. It is shown that the modified Dirac equation which contains higher order derivative of the wave function describes two massive particles with different masses. We show that physically acceptable mass states can only exist for $\beta<\frac{1}{8m^{2}c^{2}}$. Applying the condition $\beta<\frac{1}{8m^{2}c^{2}}$ to an electron, the upper bound for the isotropic minimal length becomes about $3 \times 10^{-13}m$. This value is near to the reduced Compton wavelength of the electron $(\lambda_c = \frac{\hbar}{m_{e}c} = 3.86\times 10^{-13} m)$ and is not incompatible with the results obtained for the minimal length in previous investigations.Comment: 11 pages, no figur

FEATURES OF PHYSICAL DEVELOPMENT OF THE PRIMARY SCHOOLCHILDREN WHO ARE STUDYING IN SCHOOLS OF DIFFERENT TYPES

Risk factors during the school period are continuous, systematic and long. Even the most minimum influences have their ability to be accumulate and are accompanied by violations of somatic, mental, physical and reproductive health. Change of system of school education increases influence of school factors on a state of health of pupils, and informatization and intensification of educational process are accompanied by decrease in level of health and physical development of children. The problem of health became the most actual now when transition from the mass unified education to differentiated education is carried out, thus training programs are extensive and correspond to age, physical and mental "forces" of the pupil a little. In research of influence of level of an intensification of education on physical development of children of an initial step of training studying of the main anthropometrical indicators (body length, weight, a thorax circle) children of 1-3rd classes of innovative and traditional schools of Irkutsk was carried out. In researches children, having low and moderate levels of stigmatization, risk factors in ontogenesis, biological and social anamneses took part. 465 children in total are investigated: in traditional school 72 children of 7-8 years and 69 children of 8-9 years, in innovative school 113 children of 7-8 years and 211 children of 8-9 years. It is shown that children starting training in innovative school differ from children of traditional school by higher rates of physical development. Against the raised academic load in children of innovative school some decrease of growth and weight indicators is observed and up to age of 8-9 years these indicators are compared to indicators of children of traditional school that testifies that the intensification of school training makes an adverse effect on indicators of physical development of children and demands further studying and hygienic rationing