Preview

Doklady BGUIR

Advanced search
No 2 (2016)
5-10 356
Abstract
The results of study and development of silicon nanowires (SiNWs) formation by metal-assisted chemical etching (MACE) are introduced. Linear dependence of SiNWs length from etching time is established. Total and mirror reflectance spectra, Raman scattering spectra of SiNWs and photoluminescence (PL) spectra are studied. Si band broadening and shifting to short-wave region in Raman spectra with increasing of etching time are revealed.
11-17 400
Abstract
An analysis of hardware implementations of the cryptographic hash function SHA-1 based on pipeline circuits with different numbers of logic levels was made in this paper. The hardware implementations of the hash function SHA-1 for high performance applications were described.
18-24 325
Abstract
The results of study of electrochemical and hydrothermal deposition of doped and undoped zinc oxide nanostructure arrays in liquid phase are presented in the article. The values of parameters of electrochemical deposition process at which formation of erbium doped zinc oxide nanostructures arrays occurs are determined. The influence of parameters of hydrothermal deposition process on structural properties of undoped zinc oxide is investigated. Obtained arrays of doped and undoped zinc oxide nanostructures deposited by hydrothermal and electrochemical methods can be used in photovoltaic and optoelectronic applications.
25-31 1260
Abstract
Necessary theoretical data for the analysis of information predictability of process of random structure are provided. The case with the concentrated change of structure is considered in detail. The example of the analysis of information predictability of stochastic process with the concentrated change of demolition structure is given.
32-36 302
Abstract
The estimation of influence of the microwave sensor frequency short-term instability on the information processing device operation accuracy in a security alarm system is presented. Results of theoretical calculation of microwave sensor noise characteristics and experimental data are given. Calculation of a sharply directed conic antenna with a dielectric lens is executed and results of experimental researches of its directional diagram in E - and H -planes are resulted.
37-43 380
Abstract
For increase of reliability of radar-tracking objects classification it is offered to use sequential Bayesian recognition algorithm, providing minimisation risk of accepted decisions on an object class and about further supervision continuation. For the information sequential specification propose to use a posteriori probability of solving statistics of the classification previous step as a priori information for a following step. Calculation results of radar-tracking objects recognition characteristics for three simulated classes to sequential algorithm and one-step Bayesian classification algorithm are produced.
44-50 268
Abstract
To find errors in codewords the parity check on axis and diagonals (main and auxiliary) of code plain is proposed. The results of such checks are used in algorithm to find multiple errors in lines and columns of code plane.
51-55 3388
Abstract
Conventional method of nondestructive control - laser microinterferometry, which possibilities have been earlier expanded concerning to study “semiconductor chip - substrate” assemblies peculiarity, has given the chance to evaluate these assemblies stability to mechanical, electric and thermal loadings and to predict operational reliability of prefabricated production of electronic technics and microelectronics. Laser microinterferometry has very high sensitivity to undetachable connections continuity infringement of these constructions. The above-stated method reliability and practical expediency have been proved by metrological means. Being based on high sensitivity and making a start from laser microinterferometry metrological proved reliability, reliability of a new developed high-sensitive method - laser photoacoustic introscopy in the field of undetachable connections “delicate” structures discontinuity of the given constructions has been confirmed. The comparative estimation of two aforementioned methods was spent on the basis of the correlation analysis.
56-62 249
Abstract
The general principles of expert opinions on works of artistic value with the use of laser method of spectral analysis and special software are given. An example of direct research, the results of which show the described principles and approaches is presented.
63-69 297
Abstract
The modified algorithms length coding to compress grayscale images without losses that are different from the basic algorithm taking into account the likelihood of the occurrence of pixel values and images that reduce the size of the encoded data.
70-74 1300
Abstract
The ultrasonic method for detecting of the fibrin clot formation during the coagulation tests is propose. To start clotting cascade in research APTT and PTV tests were used. The results of investigation for detecting fibrin clot formation by changing the amplitude and phase shift of the ultrasonic signal are presented.
75-80 362
Abstract
The results of numerical simulation of antenna array with rectangular, elliptical and octagonal aperture and uniform distribution of radiators are presented.
81-87 301
Abstract
The method of angle measurement in super-fast scanning (SFS) systems is presented. The SFS range cells scanning allows to get the angle information from envelop of received pulses dwell time. Complex information processing of SFS and range cell scanning in synthesized two dimensional measurer is employed.
88-94 3386
Abstract
The typical automatic tracking correlation system of optical observable objects is described. The method of tracking failure probability lowering based on the integration of the initial images of IR and TV ranges is offered and proved. Results of the experiments confirming efficiency of the offered decision are resulted.
95-100 2367
Abstract
The analysis results of inertial forces effect on the behavior of cargo and trolley, development and research methods of compensation this forces in anti-sway control systems are presented. As shown by simulation, inertial forces should be taken into account when develop anti-sway control methods. We have proposed ways to compensate this forces in control system with input shaping control system.
101-106 2407
Abstract
The results of numerical and experimental analysis of the metamaterial shields effectiveness for use with the receiver antenna signals of global satellite navigation systemsare are given. From the many possible designs the screens with regular geometry design without curvature were chosen. Numerically, brute force, strictly periodic shields and shields of finite size were investigated. The suppressing interfering signals values of 8…10 dB were theoretically achieved. Experimental studies in the real situation, basically, confirmed it.
107-113 285
Abstract
Algorithms of video stabilization from unmanned aerial vehicle board and search of small size targets on the video sequence frames with the prediction are proposed. Proposed stabilization method provides a parametrization and localization time reduction to 5.2 times compared with the SURF method. Proposed search algorithm speeds up frame processing time approximately in 6.2 times in comparison with the standard covariance method.
114-118 2420
Abstract
The results of optical and photoluminescence properties of anodic alumina formed in the acidic electrolyte and subjected to high-temperature heat treatment are described in article. It was found that the photoluminescence properties of anodic alumina determined by the oxygen vacancies with different values of the charge states and impurities in the form of acid residues. As a basis of threshold detectors in terms of the mechanical strength the substrates formed in the oxalic electrolyte and modified by heat treatment at 800 °C are preferred.
119-122 280
Abstract
The results and analysis of the impact of multilayered study environment on the process of discovery hydrocarbon deposits.
123-126 288
Abstract
The technique of the angle optical scan of the flat surfaces with sub-pixel processing of images obtained with the photodetector CMOS matrix scanner is proposed.


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


ISSN 1729-7648 (Print)
ISSN 2708-0382 (Online)