The article presents the numerical simulation of an oil reservoir heating by microwave radiation. In the model under the study, the oil reservoir is heated using volumetric heat sources arising from the electromagnetic absorption. Heat and mass transfer processes in the oil reservoir are described by the equations of heat-conduction and piezoconductivity. The rate of oil filtration in the reservoir obeys Darcy's law. As a result of the model study, the fields of temperature, pressure, viscosity and oil filtration rate in the reservoir are obtained. The well yield and the volume of produced oil during the heating of the oil reservoir by microwave radiation are calculated. It is shown that when the oil reservoir is heated by a 10 kW radiation source operating at a frequency of 1 GHz for 120 days, the well yield increases by about 3 times, and the amount of oil produced by heating the oil reservoir is 2.7 times the amount of oil produced from a “cold” well. An assessment of the effectiveness of microwave technology of electromagnetic influence on the oil reservoir in terms of energy balance has been performed.
The article considers the global problem of asteroid–comet hazard and graded protection of the Earth from space threats. A brief review of the development of technologies for detecting dangerous celestial bodies is given; projects, the implementation of which achieved important results are described, as well as major countries and organizations involved in the protection of the Earth are pointed out.
The concepts of technologies for the detection and elimination of asteroid–comet hazard, proposed by scientists from different countries, are considered separately. The classification of existing concepts by the level of application and the method of deviation of a dangerous celestial body from the trajectory of collision with the Earth is done.
The article gives definitions to the data center, fault tolerance, information availability, and describes methods for estimating the cost of forced downtime for a company. The calculations for the indicators of information availability and reliability indicators are made. The aim of the study is to analyze the reliability of the data center infrastructure elements based on operation data. The main property that a data center of a high level of reliability must have is the fault tolerance. Fault tolerance of data center is assessed using information accessibility indicators. The component of the failure rate (meant time to failure) and the average repair time (mean time to recovery) are assessed during the analysis of the information availability. After processing the input data, the average information availability period and the average downtime per year are calculated.
The article describes statistical methods for calculating network motifs frequency of occurrences. In particular, the Edge Sampling method, the method by S. Wernicke and F. Rasche, the method of random sampling of frames and the mixed method of random sampling of frames are analyzed. A comparative analysis of the quality indicators of the investigated statistical methods is done. For the mixed method of random sampling of frames, the mathematical expressions that allow obtaining consistent, unbiased, and effective estimates of frequencies for the 4-motifs are derived.
The article identifies the need for the introduction and modernization of the information security system in the enterprise. The typical structure of the information security system in the enterprise is considered. The relevance of methods application of intelligent decision support in the design of information security systems is presented. A mathematical model of intelligent decision support and a functional model of intellectual project selection of information security system are formed. The software complex architecture of intelligent decision support in the design of the security system of the enterprise information system is constructed.
The article presents the prototype implementation process of contactless user-machine interaction using the Unity 3D game engine. It describes the creation of system objects: five desktops, a drop-down menu bar, a taskbar, a welcome screen and a program window. To control the prototype using the Kinect, a number of scripts, which were originally developed by Microsoft Corporation, are used. These scripts allow recognizing and identifying all possible gestures in software. A set of classes that allow identifying pre-set user gesture and performing relevant action are also described. Objects animation parameters for a transition between different states, which can be changed by scripts, are described. The entire system of methods and classes is assembled into one piece to make control and verification functionality easier to manage. A password gesture is set as a certain unique movement by the user to start the user session. This prototype responds to six human gestures: active hand waving, one-time hand wave to the left, to the right, up, down and holding a hand still. Mouse’s motions that can be recognized as alternative user gestures are provided.
The article discusses the usage of machine learning methods for evaluating the state of fistula for patients on hemodialysis. The approach to gathering source data in laboratory conditions and methods of data processing are considered. Methods of classification are presented. Portable personal devices for patients are proposed.
Digital platforms are recognized as a successful tool for the development of breakthrough strategies in both digital and non-digital industries. The authors of this study share the results of a digital platform project implemented at a scrence and technology center of the petroleum industry. The study analyzes known approaches to the establishment of digital platforms, identifies specific features related to scientific and research activities in the petroleum industry and shows how these features have been taken into account in the ERA:GRAD digital platform.
