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Basis of the necessity of the thermal modelling and analysis of its problem DOI:10.15199/48.2017.05.28

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This article describes the main destabilizing factors affecting to the electronic equipment. The basis describes the necessity of the thermal regime in the design of equipment using specialized software. The authors give the example of the calculation of the printed circuit assembly in the subsystem of the thermal modelling “ASONIKA-TM". The authors suggest to pay attention to the main problems of the thermal modelling and the possible ways of its solution. Streszczenie. W artykule opisano główne czynniki destabilizujące, które oddziałują na sprzęt elektroniczny. Opisano konieczność stosowania reżimu termicznego w projektowaniu urządzeń wykorzystujących specjalistyczne oprogramowanie. Autorzy przedstawili przykłady obliczeń zespołu obwodów drukowanych w podsystemie termicznego modelowania “ASONIKA-TM". W publikacji autorzy zwracają uwagę na główne problemy modelowania termicznego oraz możliwe sposoby ich rozwiązania.(Podstawy konieczności modelowania termicznego i analizy tego problemu). Keywords: electronic equipment, modelling, the thermal process, destabilizing factor, printed circuit assembly. Słowa kluczowe: sprzęt elektroniczny, modelowanie, proces termiczny, czynnik destabilizujący, zespół obwodów drukowanych Introduction The modern radio-electrical equipment (REE) of the crucial use (civil or military) works in the conditions of the destabilizing factors, which can be divided into the internal and external factors. The external factors include the influence of the external environment (temperature, humidity, atmospheric pressure), the background of radiation, the electromagnetic fields and mechanical factors. The internal factors include the components of the generated heat based on the electronic components and the activity assembly of the equipment. Unlike the internal, the external destabilizing factors influence to the REE, and even switch off state. Temperature REE consist of the blocks, each of can include [...]

Acoustic excitation of electric field in water solution NaCl DOI:10.15199/48.2019.04.28

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The physical phenomena, research methods and devices are widely used in modern biological technologies [1,2,3]. One of the physical phenomena poorly studied in these technologies is action of a direct magnetic field on movement of particles of the electroconducting medium. Forward moving of the charged particles with some speed (v) in a direct magnetic field (DMF) with induction B causes occurrence of electric field E in space. Vector E is directed under some corner to directions of vectors of speed and a magnetic field [1]. This physical phenomenon has been opened in 19 century great English experimenter Michael Faradey, but has started to be applied only in the middle of 20 centuries. It has been used by Van-Alfen for an explanation of electromagnetic properties of an ionosphere of the Earth [4], for creation powerful magnetohydrodynamic (MHD) generators of electric energy [1] and for creation of pumps for swapping of liquid metals [5]. In the given work we study possibility of application of it the phenomenon for the decision of problems of biological technologies. Magnetohydrodynamic (MHD) generato12rs of electric energy are constructed, in particular, on the basis of this law. The value and direction of a vector of intensity of direct electric field in this case is defined by the formula of vector product: (1) E  v  B The scalar product of the velocity and induction of the magnetic field determines the magnitude of the electric field strength if the velocity and induction vectors are mutually perpendicular: (2) E  v  B Features of moving of the charged particles with a variable on a value and a direction of the speed are studied in the given work. In particular, such collective moving can make ions of electroconducting liquid under the influence of a wave of ultrasonic radiation (USR). Biological tissue (BT) is basically an electroconducting liquid. Periodic highfrequency compression [...]

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