The Scientific Journal of Rezeknes Augstskola
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    ADMINISTRATIVE OFFENCE PROCEEDINGS IN INSTITUTION

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    Law on Administrative Liability and amendments of sectoral laws came into force on 01.07.2020. and decentralized the rules on administrative liability law. From 01.07.2020. administrative offences, penalties and offence proceedings in construction are stipulated in Construction Law. The aim of paper is to summarize and analyse the main information about administrative offence proceedings in an institution, so that not only performed procedural actions of the institution, but also the rights of persons who participate in administrative offence proceedings would be observed in order to reduce the possibility to contest the decisions taken by an institution. The work is based on administrative offence proceedings in the building authority, but the review can also be useful in other sectors. In order to achieve set goals, the author reviewed the regulatory enactments regulating the researched issue, published sources and information available on the internet, which was published until 03.12.2021. There are summarized and analyzed researched information and put forward conclusions. The main conclusion shows that it is important not only to perform procedural actions within the time limits prescribed by the Law on Administrative Liability, but also justify decisions

    THERMAL CHARACTERISTICS OF MATERIALS IN MODELLING OF WELDING PROCESSES

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    The application of welding processes during manufacturing of metallic products result in changes of the properties of the base materials. Process simulation enables evaluation of the effect of heat application in proximity to the weld seam. The availability and use of input data, relevant for the specific material, is essential for the reliability of the results. The thermal characteristics of the materials, required for the heat modelling were identified. Their dependency on the material temperature was investigated and the formulas were presented. Particular values were found in existingdata sources, for specific structural steels, stainless steels, nickel and titanium alloys. The values of the thermal characteristics were represented and in graphical and tabulated formats, facilitating direct implementation in calculations, assessment of variation trends and applicability for specific purposes.

    EFFECT OF BORON ON THE WEAR BEHAVIOR OF HIGH CHROMIUM WHITE CAST IRONS

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    The wear behavior of high chromium white cast irons with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr and 0,18 ÷ 1,25% B is investigated. The microstructure and tribological characteristics of six compositions of high chromium white cast irons (one without boron and with 0,18; 0,23; 0,59; 0,96; 1,25% boron) are studied.After casting, heat treatment was carried out, including quenching at 9500C and tempering at 2350C for 1 h. The influence of the heating temperature in the interval 850÷11000С, 25 min on the Rockwell hardness and the microstructure are studied.The wear resistance during abrasive wear for samples after casting and after heat treatment is investigated as measured loss of mass in terms of dry friction under load of 1,5 kg during 10 min. The lowest mass loss during abrasive wear test in dry conditions friction is defined for cast irons alloyed with 0,18 % boron - ∆ m = 0,1469 g after casting and ∆ m = 0,0022 g after heat treatment. The highest mass loss is determined during abrasive testing of alloyed cast irons with 0,96 and 1,25% boron. The alloyed cast irons with 0,18 % boron show highest wear resistance.

    APPLICATION OF A FINITE ELEMENT MODEL TO OBTAIN THE INFLUENCE OF THE TREATMENT’S POWER, REFLECION AND FOCAL DIAMETER IN LASER TEXTURING OF ALUMINUM

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    In this work, a numerical model of laser texturing is considered. A finite element model of a representative sample of pure aluminum was created. The impact of a laser pulse was simulated, assuming a Gaussian volume distribution of the heat flux. Material properties are assumed to be constant and latent heat is accounted for. Results are obtained for the thermal field and the width of the vaporized zone, assuming that the crater is characterized by its maximum width. The numerical model was used to study the influence of pulse power density, reflection, focal diameter and pulse duration. The ablation threshold at different laser pulse durations was determinate.

    MODELLING AND SIMULATION OF ELECTROPNEUMATIC POSITIONING SYSTEM INCLUDING THE LENGTH OF PNEUMATIC LINES

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    This paper presents a mathematical model of electropneumatic positioning system including the length of pneumatic lines for the determination of flow and pressure in unsteady operating modes. A simulation model is developed to study the dynamic processes in an electropneumatic positioning system. Simulation of the mathematical models of the screw compressor, proportional directional valve, pneumatic lines, pneumatic cylinder and PID controller were designed in “MatLab Simulink”. The simulation models of the transients in the electropneumatic positioning system at different line lengths from 1m and 10m with stepwise variation of the input setpoint are simulated developed. Graphical comparison is made of the obtained experimental results and simulation model influence of the pneumatic line length on the dynamics of the electropneumatic positioning system are made

    COMPARISON OF POTENTIAL ROAD ACCIDENT DETECTION ALGORITHMS FOR MODERN MACHINE VISION SYSTEM

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    Nowadays the robotics is relevant development industry. Robots are becoming more sophisticated, and this requires more sophisticated technologies. One of them is robot vision. This is needed for robots which communicate with the environment using vision instead of a batch of sensors. These data are utilized to analyze the situation at hand and develop a real-time action plan for the given scenario. This article explores the most suitable algorithm for detecting potential road accidents, specifically focusing on the scenario of turning left across one or more oncoming lanes. The selection of the optimal algorithm is based on a comparative analysis of evaluation and testing results, including metrics such as maximum frames per second for video processing during detection using robot’s hardware. The study categorises potential accidents into two classes: danger and not-danger. The Yolov7 and Detectron2 algorithms are compared, and the article aims to create simple models with the potential for future refinement. Also, this article provides conclusions and recommendations regarding the practical implementation of the proposed models and algorithm

    USING LEGAL ENTITY IDENTIFIER (LEI) ON BLOCKCHAIN FOR REDUCING MONEY LAUNDERING RISKS AT FINANCIAL INSTITUTIONS

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    The increasing use of blockchain technology nowadays can play a key role in using the decentralized network as a standard database for the unified and secured registry, through which financial institutions can conduct a relevant customer due to diligence measures and business transactions by verifying organizations’ Legal Entity Identifier (LEI) codes, self-sovereign identifiers managed by the Global Legal Entity Identifier Foundation (GLEIF). With proper implementation, this solution can be applied to blockchain networks, offering the additional advantage of quality control and detailed business analysis. Thus, by giving financial institutions the benefit of interacting with legal entities that have proved their reputation and, therefore, by reducing the money laundering risk at financial institutions, blockchain technologies now could reach global standardization and acceptance by financial institutions worldwide

    STUDY ABOUT THE INFLUENCE OF THE PROCESS PARAMETERS OF VIBRO IMPACT CUTTING OF OPTICAL SLUGS ON THE PRODUCTIVITY OF THE PROCESS

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    In the article, experimental studies were carried out, contributing to determination of degree of influence of the parameters of the modes of vibro-impact cutting of optical slugs on the productivity of the process. The optimal frequencies of the forced oscillations of the technological system "slug-cut disc" were reported, in which the durability of the tool and the quality of the obtained surfaces are maximum.

    RESEARCH ON WORKING BODIES OF HAMMER CRUSHERS EMPLOYING THE FINITE ELEMENT METHOD

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    The present paper studies the issues of improving the reliability of the working bodies of hammer crushers. This machine is widely used for grinding grain material in animal husbandry and the processing industry. The main wear element of such crushers is the hammers and disks to which they are attached. To study the strength characteristics of these parts, a technique and algorithm for studying the stress-strain state of the hammer crusher disc employing the finite element method (FEM) using computer simulation software products were developed. The mathematical apparatus of finite element method simplifies the model construction where the stress-strain state must be explored. Finite element method provides solutions in the form of stress and deformation fields in almost any cross-section of structural parts. The express analysis module of the APM FEM COMPASS system was used as the software for this work. The implementation of finite element methodwill reduce the metal intensity of the equipment, increase the reliability of its operation and reduce the cost, improve the quality of the feed produced. The results of the study showed that the maximum stresses occur on the surface creating the internal holes in the place of attachment of the disc to the shaft, but the stresses that occur there remain within the normal range. 

    EXPERIMENTAL STUDIES OF AN ALGORITHM FOR MINIMIZING THE IDLE TOOL MOVES WHEN MILLING COMPLEX SURFACES ON TRIAXIAL CNC MACHINE TOOLS

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    The idle running times of the working units of a machine tool are the sum of the idle running times for the tool change and for changing the section uder treatment. The time, spent on idle running is the extra machining time. A large number of milling cutters are used for purely mechanical machining of details with complex surfaces and for a significant number of machined sections, where the complex surface is broken as a rule. This leads to an increase in the extra time for treatment. Reducing the auxiliary time in machining the parts will significantly increase the productivity of the actual milling process. When modeling the process of machining details with complex surfaces on triaxial milling machines, the optimization of the sequence of moves will allow to reduce the idle running time by up to 50% without causing deterioration in the quality of the surface layer. In modern production a method is needed, which would allow to automatically and quickly enough make a choice of an optimal option for a sequence of performing tool moves while taking into account the durability of the metal cutting tool

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    The Scientific Journal of Rezeknes Augstskola is based in Latvia
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