On the angular distribution of extensive air showers

Angular distributions of extensive air showers with different number of charged particles in the range 2.5x10^5--4x10^7 are derived using the experimental data obtained with the EAS MSU array. Possible approximations of the obtained distributions with different empiric functions available in literature, are analysed. It is shown that the exponential function provides the best approximation of the angular distributions in the sense of the chi-squared criterion.Comment: 5 pages including 1 figur

Superconductivity in the Cuprates as a Consequence of Antiferromagnetism and a Large Hole Density of States

We briefly review a theory for the cuprates that has been recently proposed based on the movement and interaction of holes in antiferromagnetic (AF) backgrounds. A robust peak in the hole density of states (DOS) is crucial to produce a large critical temperature once a source of hole attraction is identified. The predictions of this scenario are compared with experiments. The stability of the calculations after modifying some of the original assumptions is addressed. We find that if the dispersion is changed from an antiferromagnetic band at half-filling to a tight binding $cosk_x + cosk_y$ narrow band at $=0.87$, the main conclusions of the approach remain basically the same i.e. superconductivity appears in the $d_{x^2 - y^2}$-channel and $T_c$ is enhanced by a large DOS. The main features distinguishing these ideas from more standard theories based on antiferromagnetic correlations are here discussed.Comment: RevTex, 7 pages, 5 figures are available on reques

DEPENDENCE OF BENDING INFLEXIBILITY AND STRETCHING MODULE OF METAL CORD ON ITS TECHNICAL CHARACTERISTICS

The dependence of bending rigidity and stretching module of metal-cord of skeleton construction Jxdl+J8xd2 on its physical-mechanical characteristics is investigated

MASTERING OF FLAT BAND PRODUCTION FOR HIGH-LOADED HYDRAULIC HOSES

The different methods at determination of tensile strength and cross-sectional area of flat wire are analyzed. Such technological parameters as drawing-out and widening at upset spreading are examined

Patient-specific fluid–structure interaction model of bile flow: comparison between 1-way and 2-way algorithms

Gallbladder disease is one of the most spread pathologies in the world. Despite the number of operations dealing with biliary surgery increases, the number of postoperative complications is also high. The aim of this study is to show the influence of the biliary system pathology on bile flow character and to numerically assess the effect of surgical operation (cholecystectomy) on the fluid dynamics in the extrahepatic biliary tree, and also to reveal the difference between 1-way and 2-way FSI algorithms on the results. Moreover, the bile viscosity and biliary tree geometry influence on the choledynamics were evaluated. Bile velocity, pressure, wall shear stress (WSS), displacements and von Mises stress distributions in the extrahepatic biliary tree are presented, and comparison is made between a healthy and a lithogenic bile. The patient-specific biliary tree model is created using magnetic resonance imaging (MRI) and imported in a commercial finite element analysis software. It is found that in the case of lithogenic bile, velocities have lower magnitude while pressures are higher. Furthermore, stress analysis of the bile ducts shows that the WSS distribution is found mostly prevailing in the common hepatic duct and common bile duct areas. It is shown that when it is necessary to evaluate the bile flow dynamics in urgent medical situations, 1-way analysis is acceptable. Nevertheless, 2-way FSI provides more accurate data, if necessary to evaluate the stress–strain state of bile ducts. The proposed model can be applied to medical practice to reduce the number of post-operative complications

ALGORITHMS OF PROCESSING OF STEELS MICRO STRUCTURE IMAGES FOR DETERMINATION OF INTERPLATE DISTANCES OF FERRITE AND CEMENTITE

The methods of computer analysis, based on binarization of image for calculation of inter-plate distance in eutectic  colonies of pearlite steel are offered. Algorithms for determination of function of inter-plate distance, that allows to increase informativeness of microstructure investigations  and level of automation in determination of inter-plate distance, are developed

SYSTEM ANALYSIS OF INTERRELATIONS BETWEEN SPECTRAL CHARACTERISTICS OF THE STEEL MICROSTRUCTURE PICTURE AND ITS MECHANICAL CHARACTERISTICS IN METALLURGICAL PRODUCTION

It is shown that spectral characteristics of functions of closeness of the pearlite inter-plate distances, determined by image of the rolled wire samples microstructures, correlate with its mechanical characteristics and also with characteristics of wire, produced of it

STATISTICAL ANALYSIS OF INTERRELATIONS BETWEEN ROD CHARACTERISTICS AND DEFORMATION PROPERTIES OF PRODUCED WIRE

Analysis of interconnection between characteristics of rolled wire and deformational characteristics of produced of it wire in conditions of RUP «BMZ» is investigated. It is shown that the higher degree of wire delamination the lower characteristics of curling