Victor I. Kostin

Learn More
A Finite-difference method for simulation of sonic waves propagating in a vicinity of a borehole filled with fluid and surrounded by a 3D heterogeneous elastic medium is developed. The method utilizes an explicit second order of approximation FD scheme on staggered grids that approximates the elastodynamic system of equations in cylindrical coordinates. A(More)
In order to simulate the interaction of seismic waves with cavernous/fractured reservoirs, a finite-difference technique based on locally refined time-and-space grids is used. The need to use these grids is due primarily to the differing scale of heterogeneities in the reference medium and the reservoir. Domain Decomposition methods allow for the separation(More)
In acute experiments on dogs and cats with occlusion of the coronary arteries the antianginal activities of malate (100 mg/kg) and NAD (0.2 mg/kg) were studied. The drugs were found to increase the collateral blood flow and the contractile activity of the myocardium against the background of a moderate rise of the heart oxygen consumption and to normalize(More)
4 This paper presents a problem-oriented approach, designed for numerical simulation of seismic wave propagation in models containing geological formations with complex properties such as anisotropy, attenuation, and small-scale heterogeneities. Each of the named property requires special treatment which increases computational complexity of the algorithm(More)
The purpose of the study was to explore late ventricular potentials (LVPs) in patients with cardiological X syndrome (XS), their association with ventricular arrhythmias (VA), with the structure and function of the heart. Fifty-two patients were examined. A control group comprised 17 healthy individuals. LVPs were determined by recording a signal-averaged(More)
AIM A comparative study of late ventricular potentials (LVP) in patients with cardiological syndrome X (SX) and stenotic atherosclerosis of coronary arteries (ACA) as well as their relations with arrhythmia, cardiac contractility, lipid metabolism and morphological characteristics of the myocardium. MATERIAL AND METHODS The examination of 52 SX and 77 ACA(More)
  • V I Kostin
  • 1986
In acute experiments on cats the effects of malate (100 mg/kg), NAD (0.2 mg/kg) and their combination on regional myocardial contractility were studied during acute coronary artery occlusion. All the drugs increased significantly myocardial contractility in border and intact zones. However, the response of the central ischemic zone to drug effects was(More)
In acute experiments on cats, the effect of nitroglycerin (0,5 mg/kg), obsidan (0,5 mg/kg) and adrenaline (0,005 mg/kg) on the contractility of various segments of the myocardium in acute ischemia state was studied. It is shown that nitroglycerin increases the contractility of the border zone and decreases the compensatory hyperfunction of intact myocardial(More)