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The paper is devoted to the issue of energy efficiency monitoring in industry. The drawbacks of well-known statistical method based on Monitoring and Targeting systems are considered. An improved procedure of energy efficiency monitoring for industrial objects has been proposed. Appropriate procedure is based on the statistical modelling of energy consumption, including confidence intervals of mathematical...
In this paper a novel operational amplifier (OPA) voltage-controlled oscillator (VCO) with inductive feedback is analyzed. The VCO comprises positive and negative feedback implemented through two inductors. Mathematical equations for determining the oscillation voltage amplitude and start-up conditions are derived. The designed VCO operates in UHF range from 739.7 MHz to 1.003 GHz with maximum phase...
The research of the electromagnetic field distribution of the tunable shielded cylindrical metal-dielectric resonator was performed. The distribution of axial electric field in the resonator is presented. The external Q-factor and coupling coefficient were calculated for coupling loops of different shape and size.
Developing and studying modern radio systems is hardly possible without the creation and research of their mathematical models. This paper discusses a complete MATLAB model, including the formation, transmission and reception of the Earth's surface and atmosphere images, obtained by low-orbit meteorological satellites in the digital low-rate picture transmission (LRPT) format. Using models enables...
The model of interaction of electron with electromagnetic irradiation for non-isotropic carbon-hydrogen a long chain molecular and radical is reconsidered. The time interval from start of interaction to electron detachment under different type of irradiation and external static magnetic field is determined. The influences of vector intensity of combine magnetic field on the form and frequency of 3D...
An approach to calculating integral conductivity of a model nanotube/dielectric composite system is discussed. Conductivity of random nanotube network formed in the dielectric medium is simulated considering tunneling conductivity between individual nanotubes being in close proximity and taking into account intrinsic conductivity of nanotubes.
We have presented the practical application of complex permittvity dielectromerty method to identify the glucose amount in water solution for modelling the determination of the glucose amount in human blood. We used disigned by us the waveguide-differential dielectrometer for the complex permittivity determination of high loss liquids such as water and water solutions. The complex permittivity of...
Fabrication of core/shell-structured Y2O3:Bi, Eu/SiO2 nanophosphors was presented. The core nanophosphors, Y2O3:Bi, Eu, were synthesized by urea precipitation and annealing. The silica shell was formed by modified Stober method and its thickness was controlled by the amount of TEOS. Additional heat-treatment was applied on the core-shell particles in order to remove any residual impurities. Size and...
Magnetic Resonance Imaging (MRI) is a non-invasive widely used modality in medical diagnosis. One of disadvantages of this method is the low signal to noise ratio (SNR) and (or) contrast to noise ratio (CNR). That's why the image analysis tasks such as segmentation, reconstruction and registration are rather complicated. So the noise reduction in MR images is very important as a pre-processing task...
The idea of this paper is that the properties of the virus can be studied by physics methods, in particular, optical methods. The vesicular stomatitis virus was used for this research. Optical absorption spectra of virus and viral capsides were investigated. Also, these spectra have been simulated theoretically. Calculations were made using the effective sensibility. Where absorption is determined...
The possibility of the inhibition of virus activity due to the local field enhancement effect near the surface is studied. Interaction in the system “virus-surface” is considered; the local field distribution and the absorption potential in the system have been calculated. The influence of the nanoobjects on the local field and adsorption potential has been studied. As the nanoobjects the infinite...
Microfluidic systems are emerging as potential novel flow-based assays for monitoring platelet response under controlled shear stress conditions. Current approaches for microfluidic channel design are currently based on computing basic fluid dynamic quantities (e.g. wall shear stress) from simplified formulas. However, accurate designing approaches should take into account the variability of shear...
The problem of image enhancement for low-contrast medical images with complex structure was considered. The histogram-based method for automatic contrast enhancement of low-contrast images with small-size objects on the basis of the analyzing of contrast distribution at boundaries of objects and background was proposed. The proposed method is intended for automatic preprocessing of complex medical...
Simple low power circuit for bioimpedance tracking on different frequencies is purposed in this paper. Using ADC and digital signal processing is intentionally avoided to reduce power consuming and processing power required. Instead only analog comparators and digital timers are used to determine signal phase, amplitude and calculate impedance with noise correction. Programmable system on chip (PSoC)...
This paper presents the new Write-Back scheme, which solve the half-select operation problem and faster than conventional Write-Back technique for memory array with seven-transistor (7T) single-ended static random access memory (SE-SRAM) bit cell. Data in the cells are sensitive and flipping can happen, so proposed scheme improves the stability issue for half-selected cells without performance degradation.
The model for the optical response of the template with sinusoidal relief based on a self-consistent analytical approach is proposed. The dispersion properties of evanescent TE-polarized surface waves under Kretchman configuration is studied theoretically in the frame of the effective susceptibility concept. An influence relief parameters on dispersion spectrum of the TE waves is investigated.
In the paper field-effect transistors with porous silicon layer in the gate area are described. Such structures can be used for vapor detection as well as in liquids. It was shown that depending on formation conditions porous silicon layer formed by different etching methods can be selective between substances.
The practical use of a scanning tunneling microscope for modifying the sample surface and for creation of nano-objects on the sample surface is shown. The possibility of modification of the sample surface by tunneling current was shown. Nano-objects on the surface of the experimental samples were created using contact and non-contact modification of surface. This may also enable preparation of the...
In this paper we propose a new method for constructing the magnetic field of frequency transducers based on magnetically effect in bipolar transistors. Circuits of the magnetic field of frequency transducers on the single and the two-collectors bipolar transistors have been offered, which sensitivity is here from 0.5 to 7 kHz/mT.
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