Residual oil pockets and their stimulation in productive formations

The article analyzes processes running in an oil pool under contour water flooding and resulting in formation of bypassed oil. Based on stability criteria, the authors discuss destabilization of the residual oil pockets by vibration so that the bypassed oil becomes proved & developed.     

Use of heparin-coated "Jo Stent M" in patients with ischemic heart disease: first results

The aim of the present study was to make a clinical and angiographic assessment of early outcomes of the use of heparin-coated new "Jo Stents M". The Study comprised 41 patients who were implanted a heparin-coated new "Jo Stent M". There was an immediate success in 45 (97.6%) of 46 cases, the optimal angiographic and suboptimal (the maximum residual stenosis (13%)) results being achieved in 43 (93.4%) and 2 (4.4%) cases, respectively. The first success of the procedure was 97.8%. Due to acute stent thrombosis, acute occlusion with evolving myocardial infarction occurred in 1 (2.4%) patient. Following the procedure, the mean proportion of the stenotic diameter was (-5.8 +/- 6)%. After the procedure, the minimum stenotic diameter with the mean due diameter of 2.9 +/- 0.5 mm was 3.0 +/- 0.2 mm. The procedure-induced diameter increase was 2.1 +/- 0.5 mm. The total number of lateral branches involved in the stenting area was 11 (100%), 2 (18.2) of them closed after stent implantation. Two branches came into the stenting area in 1 (2.4%) case. At discharge, angina pectoris was absent in 30 (74%) patients. The heparin-coated "Jo Stent M" are effective and safe in treating patients with various clinical and angiographic manifestations of coronary atherosclerotic lesions.     

Adaptive video image recognition system using a committee machine

An ensemble of classifiers has been built to solve the problem of video image recognition. The paper offers a way to estimate the a posteriori probability of an image belonging to a particular class in the case of an arbitrary distance and nearest neighbor method. The estimation is shown to be equivalent to the optimal naive Bayesian estimate given the Kullback-Leibler discrimination being used as similarity measure. The block diagram of a video image recognition system is presented. The system features automatic adaptation of the list of images of identical objects which is fed to the committee machine input. The system is tested in face recognition task using popular data sets (FERET, AT&T, Yale) and the results are discussed.     

Anomalous Phenomena on Surfaces of Preirradiated Cryocrystals

Sputtering of Ar atoms from the surface of nominally pure and O₂ doped solid Ar, preliminary irradiated by an electron beam, is studied using a combination of activation spectroscopy methods — thermally stimulated luminescence (TSL) and thermally stimulated exoelectron emission (TSEE) — with measurements of the sputtering yields. Anomalous yield of Ar atoms was detected at temperatures much lower than the characteristic sublimation temperature of solid Ar. A charge recombination reaction is considered to be the stimulating factor for the low temperature desorption from preirradiated solid Ar. Possible models of the anomalous sputtering are discussed and the crowdion mechanism of the atom ejection from the surface is proposed. The influence of oxygen on the sputtering yield is considered.PACS numbers: 61.82 Ms, 68.43 Rs, 68.43 Vx, 72.20 Jv, 71.35 −y     

Thermal conductivity and mechanical properties of expanded graphite

The thermophysical and mechanical properties of compacted expanded graphite (EG) were studied. The experimental results were interpreted with application of similarity theory. The compacted EG critical density corresponding to the observed jump in the thermal conductivity coefficient and elasticity modulus was shown to depend on the expandable graphite preparation method, EG bulk density, and dispersion degree and amounted to 0.01 and 0.005 g/cm³ for the studied EGs.     

Optimization of passively damped composite structures

The paper considers a technique for the optimal design of structures made of viscoelastic materials with the purpose of reducing vibration amplitudes at dynamic loads. __________ Translated from Problemy Prochnosti, No. 5, pp. 128–134, September–October, 2006. Report on International Conference “Dynamics, Strength, and Life of Machines and Structures” (1–4 November 2006, Kiev, Ukraine).     

An approach to surface retouching and mesh smoothing

In this paper, we discuss a novel, fast, practical algorithm for surface modification of geometric objects. A space-mapping technique is used to transform a given or damaged part of a surface into a different shape in a continuous manner. The proposed approach is used for surface-retouching and mesh-smoothing problems. The technique, in fact, is based on a local processing of polygonal data that can be applied to the fairing of 3D meshes. We consider shape transformation as a general type of operation for surface modification and attempt to approach the problem from a single point of view, namely, that of the space-mapping technique based on the implementation of radial-basis functions. Experimental results are included to demonstrate the functionality of our mesh-modeling tool.