Thick de Sitter 3-Branes, Dynamic Black Holes and Localization of Gravity

The embedding of a thick de Sitter 3-brane into a five-dimensional bulk is studied, assuming a scalar field with potential is present in the bulk. A class of solutions is found in closed form that can represent a thick de Sitter 3-brane interpolating either between two dynamical black holes with a $R \times S_{4}$ topology or between two Rindler-like spacetimes with a $R_{2}\times S_{3}$ topology. The gravitational field is localized in a small region near the center of the 3-brane. The analysis of graviton fluctuations shows that a zero mode exists and separates itself from a set of continuous modes by a mass gap. The existence of such a mass gap is shown to be universal. The scalar perturbations are also studied and shown to be stable.Comment: the study of scalar perturbations and some relevant references have been added. The most used definition for mass in de Sitter space has been adopte

Assessment of police work by the population of the Perm region

The factors influencing the population attitude to police work in different cities and areas of Perm region are analyzed. The material is based on the data of the public opinion polls conducted by experts of General Department of the MIA of Russia for the Perm region together with members of the Public council under the General Department and sociologists of Sociological Monitoring Department of home policy of the Perm region Governor’s Administration. The public opinion poll was conducted in October, 2012 on the territory of twenty municipal areas of the region including the city of Perm. 1,200 people were interviewed, maximum error is ± 2.9 %. The main study’s objectives were the following: 1) to determine the degree of region’s population satisfaction with police activity; 2) to assess the role of factors influencing the degree of satisfaction with police work; 3) to determine the degree of influence of respondents’ experience of direct contacts with police officers on their attitude to law enforcement agencies; 4) to establish the dependence of police work assessment on the respondents’ residence. The basic indicators to characterize the attitude of Perm region population to police work are the following: the degree of population satisfaction with law enforcement agencies’ activity; dynamics of police work assessment compared with the period prior to adopting the Federal law оn police; police authority over population; the degree of population confidence to the police; assessment of police activity on maintaining public order. The conclusions are based on the results of sociological researches

Use of the Speckle tracking method for determining global parameters of heart contractility in healthy individuals

The speckle tracking method allows one to quantify the temporal and spatial characteristics of myocardial contraction. Importantly, it does not depend on a scanning angle and allows one to record the movement of speckles in 2D mode in any direction, unlike tissue Doppler imaging. This examination is non-invasive, safe for patients, and economically more beneficial in comparison with other modern methods of assessing heart contractility: MRI and scintigraphy. Diagnostic thresholds are suggested for obtaining peak values of all types of global strains and strain rates by sampling a healthy group, which can reveal early signs of left ventricle contractility failure. Correlation relationships of deformation parameters between themselves and with left ventricular hemodynamic indices, as well as anthropometric parameters in healthy subjects highlight the features of heart contraction biomechanics. However, currently this method is scarcely studied because no generally accepted normal range of strain values exists. • It is necessary to have sufficient qualification and skills in dealing with the XStrain™ Esaote software to obtain optimal values ​​of myocardial deformation. • The study results expand the database of this software for users and determine the normal range of the left ventricular contractility parameters. • The revealed interrelationships of strain values ​​in healthy individuals are relevant for understanding how the contractility mechanisms are altered in patients, and open up the prospect of studying the heart’s compensatory possibilities. Keywords: Correlation analysis of contractility indices, Global strain, Global strain rate, Normal range of strain, Echocardiograph