Our vector of development is releasing of demanded and competitive products DOI: 10.22184/1993-8578.2021.14.7-8.400.404
Nuances and peculiarities of DOP-testing and differential pressure measurement DOI: 10.22184/1993-8578.2021.14.7-8.406.411
This paper deals with technical aspects of differential pressure measurements, integrity and tightness of HEPA-filter installations (DOP test), and also describes the clean room certification procedures, which include a number of important parameters measurements required by national standards such as particulate matter concentration, temperature, humidity, noise level, differential pressure and others. Particular attention is paid to checking the integrity and tightness of the HEPA-filters.
Design of a high-voltage three-channel voltage regulator for automotive applications DOI: 10.22184/1993-8578.2021.14.7-8.412.423
The paper presents the principles of designing a three-channel voltage regulator. Modern technologies for intelligent power management allow of implementing complex functionality within a single circuit. One of the possible applications of power management systems is their use as voltage regulators. Here, an important role is played by such system parameters as the generated voltage levels and / or currents, real-time temperature monitoring and various types of errors that such a key reports to the central controller in real time. The minimum switching time of such a regulator reduces likelihood of an error associated with noise from the power supply circuits of the microcircuit. Intelligent power management technologies allow the development of a variety of specialized systems such as anti-lock brakes, airbag control or engine management in car electronics. As well as the systems similar in structure in the fields of industrial electronics, telecommunications and data processing. Currently available systems allow to manage power and external systems and analyze systems for errors or hazardous conditions. The proposed solution allows to provide a stable output voltage of 5V in a wide range of input voltages from 5.5 to 45V, with an output current of up to 450mA in the main channel and up to 150mA and 50mA in the auxiliary ones. The paper describes the main functions of the design, such as the function of limiting the output current, protection against reverse polarity, temperature protection, the function of limiting the excess of the output voltage, as well as the digital function of the built-in "watch dog" timer intended for connecting the design to a microcontroller unit.
Super-resolution microscopy in biomedicine and biology DOI: 10.22184/1993-8578.2021.14.7-8.424.428
The optical microscope is one of the most common and simple tools for studying objects on the microscale, especially in the biological sciences, biomedicine, and chemistry. A significant limitation for use of the optical microscopy is the optical diffraction limit, which is about 250 nm in white light at a wavelength of about 550 nm and a microscope numerical aperture of 1.0. This resolution is often insufficient for imaging tasks of cell organelles, tissue, viral and bacterial particles. A microsphere placed on the sample surface can overcome this limitation and visualise structures as small as 25 nm.
Electromagnetic shielding of superconducting quantum circuits DOI: 10.22184/1993-8578.2021.14.7-8.446.458
The article provides an overview of the shielding systems of quantum circuits used in leading scientific groups. The general requirements for the construction of such systems are outlined and the problems associated with a wide variety of materials and the absence of the methodology for their development are identified.
Influence of structural state of TiNi alloy on corrosion resistance in activating electrolytes DOI: 10.22184/1993-8578.2021.14.7-8.460.467
This work deals with the corrosion behavior of the TiNi alloy in the coarse-grained and ultrafine-grained states in inorganic media. Data on the microstructure of the TiNi alloy were obtained after corrosion tests by the gravimetric method. Research in active electrolytes has shown that the dissolution of titanium nickelide in the austenitic structure alloy is facilitated. The high activity of ultra-fine grained titanium nickelide is due to the smaller grain size of alloy and longer boundary lengths as well as a high density of dislocations along the boundaries.
3D-image construction, processing and analysis in biomedical scanning probe microscopy DOI: 10.22184/1993-8578.2021.14.7-8.430.433
The scanning probe microscopy is becoming an important and informative tool in biomedicine and medical diagnostics due to the development of efficient data processing algorithms. The software allows measuring sizes, volumes, object areas, contour lengths, angles of crystal structures, surface roughness, form factor, friction and elasticity coefficients, and adhesion values. The data on the imaging of bacterial and cellular structures and the results of their subsequent quantitative description are presented in this paper.
Diffusion properties of human brain cortex in-vivo. Part 2 DOI: 10.22184/1993-8578.2021.14.7-8.434.445
We investigated the cortical depth dependence of diffusion properties with high resolution over the whole human brain in vivo establishing a first reference for future cortical diffusion tensor imaging studies. All brain areas showed similar cortical depth dependence of diffusion invariants with gradually decreasing and increasing patterns of fractional anisotropy (FA) and mean diffusivity (MD) from white matter to cerebrospinal fluid. At the white matter – cortex interface a drop in FA and a peak in MD is observed. The structure of these profiles is likely reflecting fiber-bending effects at the white matter – cortex interface and fiber density reduction at the cortex – cerebrospinal fluid border.