The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper the new approach for guaranteed state estimation for electromechanical systems with induction motor is implemented for failure's identification in such systems. Approach is based on matrix comparison systems method, and a comparison with some other estimation methods was realized in package MATLAB. The experimental unit made for practical approbation of identification algorithms is presented...
One of the main stages of production process in manufacturing articles is thermic processing. Quality control of thermal processing consists in hardness measurement. For hardness measurement methods of Brinnel (SS 9012 - 50), Rockwell (SS 9013 - 59), Vikkers (SS 9013 - 59) et al are used. They are based on different methods of static and dynamic effect on the surface of the tested body that is metal...
"Termotest" is a new device developed for nondestructive control, where thermal electromotive force method is used. Functioning of a circuit is based on the fundamental property of electrical thermometry: "Electromotive force of a circuit, consisting of several different conductors, depends only on the temperature of soldered joints and doesn't depend on thermal gradient along conductors".
Calculation of distributions of the absorbed dose is an important constituent of radial therapy of malignant tumours. Accuracy of such calculation substantially determines radial affect on the tumour and the result of treatment. Therefore the scientists continue to improve the methods of calculation in order to obtain a lot of information about distribution of the obsorbed dose with great accuracy...
The aim of the present investigation is adsorbent selection for gas draining and purification, its regeneration, economic efficiency and ecological significance in decreasing waste products negative influence on the environment.
Two approaches - active and passive - are generally used in thermal nondestructive evaluation. The active approach requires using an external heat source to stimulate materials to be inspected, as well as recording thermal fields in time. Unlike the active approach, the passive approach is applicable to materials and structures, of whose the temperature is different from ambient. In this case, temperature...
Development of highly effective quick-acting multiple inputs of machine arithmetic digital electric drives is one of topical problems. A great amount of works in this field (Rabiner L., Gold B., Sholomov L.A.) confirm constant interest to the problem. Adder- subtractors used in digital devices determine the rate of fulfilling mathematical operations. Binary system of notations used in well known devices...
Concrete is usually placed in summer period when environmental temperature contains 5...30degC. In this case physical-chemical transformations in concrete occur as it is supposed to be, however, environmental temperature is not always kept within this limits. In cases of placing concrete at low temperatures or for acceleration of concrete hardening different methods are used: chemical ones - introduction...
The aim of the present work is finding nitrogen saturation peculiarities of technically pure titanium BT1-0 in glow discharge at low pressures, studying the process forming nitration layer depending on sample temperature and discharge parameters, investigating the layer structure and its phase composition. Profiles of microhardness of nitrating titanium BT1-0 at different temperature are determined.
The titanium carbides, nitrides and carbonitrides of different composition are proposed as promising conductive fillers for manufacturing electroconductive polymeric composite material (EPCM) for radioelectronic technique able to replace powders of precious metals. When obtaining EPCM based on nonstoichiometric conductive titanium compound and investigating their properties, the effect of structuring...
Operating characteristics of metals with coatings made by different methods are often determined by the structure of transition zone from coating to the base. This problem is of significant importance in welding and welding deposition of steels possessing different structural classes as intermediate layer of mated between each other deformed austenite and ferrite grating is formed in the zone of alloying...
Aluminum hydroxide is made good use of production of ceramic materials, is applied to catalytic agent production, and is also widespread technical adsorbent, filling material of polymer and others. The application productivity of aluminum hydroxide is depends on method of its production and type of source material. These substances are usually produced with hydrolysis of aluminum salts, with sedimentation...
The materials used in nuclear power engineering as shells of heat releasing elements (HREI) are of significant importance. As it is known shell HREI should satisfy many demands: be mechanically reliable and provide the constancy of form, dimensions geometry at prolonged reactor operation; possess high physical and mechanical properties. In this connection large amount of investigations is devoted...
The cooling rate of CuPb13Sn10Zn2Ni2 bronze has been detected in moulds of different heat conductivity: metal (steel), shell moulds and chromo- alumina phosphate moulds. It is supposed that the cooling rate in chromo-alumina phosphate moulds comes to that one of sand-and-loam moulds. The pouring temperature was 1,050degC and 1,220degC.
The process of gradual damage accumulation under alternating stresses resulting in changes of the properties, phase structure, and defect substructure of the material and in the initiation of cracks, their further growth, and finally failure of the material is called the metal fatigue. The application of modern structural methods of research has allowed making the certain steps in understanding of...
This paper deals with the problem of detecting forward obstacles on the road and proposes a solution for safe driving. To detect a vehicle or an obstacle, obtained image frame goes through three main algorithms, such as finding underneath, edge extraction, counting edge. The main result of the paper is the following: (a) the system architecture designed is very simple; (b) the embedded system achieves...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.