scholarly journals Comparative analysis of calculation methods for enclosing pit structures

2021 ◽  
Vol 18 (3) ◽  
pp. 92-99
Author(s):  
V. V. Konyushkov ◽  
Keyword(s):  
Comparative Analysis ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Preliminary Calculation ◽  
Elastic Line ◽  
Advantages And Disadvantages ◽  
Software Packages ◽  
The Stability ◽  
Cost Of Materials ◽  
Selection Of

Choosing the calculation method for the enclosing excavation pit structures is an urgent issue, since the results of the calculations determine the selection of the geometric and mechanical parameters, as well as the estimated cost of materials and works. At present, at calculation of the enclosing structures of excavation pits, there are used classical semi-graphical solutions, semi-analytical programs and software packages based on the finite element method. Each method has its own prerequisites and assumptions, as well as advantages and disadvantages. The purpose of this article is presentation of comparative analysis results of the main methods for calculating the enclosing structures of excavation pits considering their features and boundary conditions of application. The author has performed test calculations of the excavation pit enclosing structures using the elastic line method in the SCAD and PLAXIS 2D software packages. The author has also developed and proposed a simplified method for calculating pit fences. This method can be used at the pre-project stage of construction in the form of preliminary calculation or as additional verification calculation of the stability, strength and deformability of pit enclosing structures.

scholarly journals Comparative analysis of cylindrical and planar aesa in 3d suveillance radar.

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Dragan Paunović ◽  
Keyword(s):  
Comparative Analysis ◽  
Vertical Plane ◽  
Optimal Solution ◽  
Main Beam ◽  
Advantages And Disadvantages ◽  
Near Zone ◽  
Constant Shape ◽  
Mechanical Rotation ◽  
Original Configuration ◽  
Selection Of

A modern rotating 3D surveillance radars scan azimuth by mechanical rotation, and scan elevation using Active Electronic Scanning Array (AESA) in Multi Beam Receive Mode (MBM). Radars with fixed cylindrical AESA and four-sided prismatic antenna, with 4 flat AESA, scan azimuth electronically, without mechanical rotation. The most significant advantage of electronic scanning is the possibility of Multi-mode operation: surveillance targets in the far zone and targeting targets in the near zone. However, electronic scanning also brings problems. A main beam of planar AESA spreads and lateral lobes increase when the radiating direction increases. An original arrangement of shifted array to reduce lateral lobes has been proposed. The cylindrical array has a constant shape of pattern during azimuth scanning. But, for both prismatic and cylindrical AESA, the beam deforms during scanning in vertical plane, so limits the elevation scan. Also, the complexity and price of fixed AESA is significantly higher compared to the rotating one. In order to enable the selection of the optimal solution for a specific application, the comparative analysis of advantages and disadvantages for cylindrical, prismatic and rotating AESA is done. The original configuration of the cylindrical AESA for Very Fast Scanning in Near-zone has been proposed.

Psycholinguistic techniques in second language acquisition research

2003 ◽  
Vol 19 (2) ◽  
pp. 144-161 ◽  
Author(s):  
Theodore Marinis
Keyword(s):  
Second Language ◽  
Second Language Acquisition ◽  
Language Acquisition ◽  
Language Processing ◽  
Online Experiments ◽  
Second Language Processing ◽  
Advantages And Disadvantages ◽  
Financial Costs ◽  
Software Packages ◽  
Selection Of

This article presents the benefits of using online methodologies in second language acquisition (SLA) research. It provides a selection of online experiments that have been widely used in first and second language processing studies that are suitable for SLA research and most importantly discusses the hardware and software packages and other equipment required for the setting-up of a psycholinguistics laboratory, the advantages and disadvantages of the software packages available and what financial costs are involved. The aim of the article is to inspire researchers in second language acquisition to embark on research using online methodologies.

Hardware Implementation Tasks to Configure Regulators

2014 ◽  
Vol 945-949 ◽  
pp. 2611-2616 ◽  
Author(s):  
Valery Goncharov ◽  
Ilya O. Ilyin ◽  
Andrey Kudryavtsev
Keyword(s):  
Mobile Device ◽  
Hardware Implementation ◽  
Interpolation Method ◽  
Real Interpolation ◽  
Mathematical Software ◽  
The Real ◽  
Advantages And Disadvantages ◽  
Software Packages ◽  
Real Interpolation Method ◽  
Selection Of

The authors consider the problem of configuring regulators. This paper describes the selection of instrumental tools to create a mobile device, based on the real interpolation method, enabling to configure regulators without the use of mathematical software packages like Matlab or Mathcad. Also described are advantages and disadvantages of selecting hardware and software part for the mobile devise:

scholarly journals Stability analysis of the Kosciuszko Mound using terrestrial laser scanner and numerical modelling

2018 ◽  
Vol 66 ◽  
pp. 01018
Author(s):  
Elżbieta Pilecka ◽  
Karolina Tomaszkiewicz
Keyword(s):  
Stability Analysis ◽  
Laser Scanner ◽  
Technical Condition ◽  
Point Of View ◽  
Terrestrial Laser Scanner ◽  
The Finite Element Method ◽  
Anthropogenic Soils ◽  
Differential Model ◽  
The Stability ◽  
Selection Of

Landslides which form in anthropogenic soils are complicated from a geological engineering and geotechnical point of view. Each case requires a detailed investigation and the selection of effective reinforcements is a difficult project issue. The study presents the problem of the stability analysis of landslides occurring in the anthropogenic soils of the Kosciuszko Mound in Cracow. The previously performed protections are discussed to highlight their ineffectiveness and the current technical condition of the mound is also presented. By overlapping the results of displacement measurements made with a terrestrial laser scanner, a differential model of the terrain was created which made it possible to determine the size and direction of the deformation of the slopes of the mound and the tendencies for the development of landslide movements in this area. A cross-section, selected on the basis of the model, was numerically analysed using the finite element method (FEM) in the Midas GTS NX program. As a result of the analysis, the values of the displacements and strains occurring in the Mound were calculated. On the basis of the value of the safety factor obtained, it was also possible to assess the risk of landslide movements.

scholarly journals Influence of the train load on the stability of the subgrade at the speed of movement

2021 ◽  
Vol 264 ◽  
pp. 02019
Author(s):  
Abduhamit Abdujabarov ◽  
Pardaboy Begmatov ◽  
Farkhod Eshonov ◽  
Mashhur Mekhmonov ◽  
Makhsud Khamidov
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Inhomogeneous Deformation ◽  
High Speed Train ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Soil Material ◽  
Subgrade Soil ◽  
Sloping Terrain ◽  
The Stability

The article deals with the vibration of the subgrade soil and for the sections of the sloping terrain of the location of the subgrade calculation methods. In the calculations, we use the finite element method, the advantages of which are the simplicity of obtaining systems of resolving equations and the possibility of thickening the grid of elements and taking into account the inhomogeneous deformation and density properties of the soil material. The stress-strain state caused by structural changes in the subgrade during high-speed train traffic is determined. It also determines the dependence of the increase in the stress in the embankment of the subgrade on its height during high-speed train traffic, the dependence of the stress in the embankment of the subgrade on its width during high-speed train traffic, and the dependence of the stress in the slopes of the notch its depth.

The selection of the indicators and the mathematical model for the evaluation of resistance of electronics and information systems to electromagnetic radiation.

2021 ◽  
Vol 5 ◽  
Author(s):  
A.J. Onufrej ◽  
◽  
A.V. Razumov ◽  
A.V. Rassadin
Keyword(s):  
Mathematical Model ◽  
Information System ◽  
Information Systems ◽  
Comparative Analysis ◽  
Electromagnetic Radiation ◽  
Analytical Model ◽  
Probability Of Failure ◽  
The Stability ◽  
The Mathematical Model ◽  
Selection Of

Based on a comparative analysis of the definitions of reliability and resistance, the article substantiates the possibility of using the probability of failure of radio-electronic equipment of an information system (REA IS) as an indicator of resistance to the effects of EMR. The interrelation of these definitions is shown and an analytical model is proposed for assessing the stability of equipment to the effects of a sequence of electromagnetic radiation. As an indicator of resistance, it is proposed to use the probability of failure of the REA during operation.

scholarly journals Improving the stability of high embankment slopes on weak foundations

2021 ◽  
Vol 244 ◽  
pp. 05018
Author(s):  
Aleksey Kamenchukov ◽  
Ilya Ukrainskiy ◽  
Gamilia Nikolaeva
Keyword(s):  
Mechanical Characteristics ◽  
Field Studies ◽  
The Finite Element Method ◽  
Software Packages ◽  
Rolling Strip ◽  
Geological Conditions ◽  
Permafrost Soils ◽  
Analytical Review ◽  
The Stability ◽  
Physical And Mechanical Characteristics

The article considers the issues of assessing the stability of non-standard soil-geological systems in difficult conditions. An analytical review of modern methods and tools for assessing the stability of embankment slopes is carried out. The features of the work of the embankment in the areas of the spread of permafrost are considered. The features of the design of embankments on permafrost soils with the preservation or partial thawing of frozen soils have been studied. Two versions of the calculated static schemes of sliding surfaces are presented: base - subgrade and base - subgrade - pavement. Based on the results of field studies, the physical and mechanical characteristics of the soils of the embankment and the base of the subgrade were determined, which became the basis for mathematical modeling and assessment of the stability of the embankment slopes. In software packages GeoStab and Geo5, based on the finite element method and the results of field studies, digital models of embankments were built on a weak foundation. The calculation of the stability of the system “base - subgrade” under the action of a standard uniformly distributed load has been performed. Two models of the system and the base - subgrade - road surface are considered: without cracks on the rolling strip and with cracks. It was found that coating defects affect the stability of the system only in the presence of an earthquake of medium strength and more. Recommendations for strengthening the slopes of embankments operating in difficult soil-geological conditions are given.

scholarly journals METHODS FOR THE DETERMINATION OF THE STABILITY OF THE EARTH CONSTRUCTION DEVICE

2017 ◽  
pp. 81-87
Author(s):  
О. L. TIUTKIN ◽  
О. І. DUBINCHIK ◽  
V. R. KILDEEV
Keyword(s):  
Geological Structure ◽  
Calculation Model ◽  
Theoretical Research ◽  
Advantages And Disadvantages ◽  
Earth Construction ◽  
Stability Of Slopes ◽  
Research Findings ◽  
The Stability ◽  
Selection Of

Purpose. Conduct a generalized analysis of methods for assessing the stability of slopes and slopes, which are currently used. An assessment of the stability of slopes and slopes can be carried out only on the basis of a comprehensive study using different methods. Methodology. Theoretical research. Findings. The analysis carried out in the framework of this study to determine the stability characteristics of landslide slopes suggests that the coefficient of stability depends directly on the nature, steepness and geological structure of the slope. Originality. The calculation scheme for determining the coefficient of stability directly depends on the methods chosen. The calculation will be reliable in the event that the corresponding scheme is more accurately and more detailed. Practical value. The use of each of the methods considered provides for the use of a number of special geotechnical surveys and the selection of a calculation model by comparing advantages and disadvantages.

scholarly journals Introduction of electronic test tools with the aim of increasing the effectiveness of the knowledge test

2019 ◽  
Vol 16 (4) ◽  
pp. 14-25
Author(s):  
Yuriy Skorin ◽  
Oleksandr Shcherbakov
Keyword(s):  
Comparative Analysis ◽  
Effective Means ◽  
Educational Process ◽  
Control Measures ◽  
Advantages And Disadvantages ◽  
Computer Testing ◽  
Definition Of ◽  
Forms Of Knowledge ◽  
Testing And Evaluation ◽  
Selection Of

In article as the direction of improvement of educational process, increase of efficiency of use of perspective forms of check and an assessment of knowledge introduction in educational process of electronic means of computer testing is defined. The study is based on the analysis of existing forms of verification and evaluation of knowledge and the main types of control measures in the study of the discipline, the allocation of advantages and disadvantages of the main forms of knowledge testing, the rationale for the choice of testing as the most effective means of testing and evaluation of students' knowledge, the allocation of the main types of tests, the prospects of the use of electronic tests conducted using computer technology, the definition of the function of computer testing, comparative analysis of software products, providing the implementation of computer testing and selection of the most promising of them, capable, on the one hand, to simplify the testing process, and on the other hand, significantly improve the efficiency of testing and evaluation of students' knowledge. The study suggests: first, analysis, generalization and understanding In article as the direction of improvement of educational process, increase of efficiency of use of perspective forms of check and an assessment of knowledge introduction in educational process of electronic means of computer testing is defined. The study is based on the analysis of existing forms of verification and evaluation of knowledge and the main types of control measures in the study of the discipline, the allocation of advantages and disadvantages of the main forms of knowledge testing, the rationale for the choice of testing as the most effective means of testing and evaluation of students' knowledge, the allocation of the main types of tests, the prospects of the use of electronic tests conducted using computer technology, the definition of the function of computer testing, comparative analysis of software products, providing the implementation of computer testing and selection of the most promising of them, capable, on the one hand, to simplify the testing process, and on the other hand, significantly improve the efficiency of testing and evaluation of students' knowledge. The study suggests: first, analysis, generalization and understanding of the experience of using modern methods of knowledge control, analysis of existing forms of knowledge assessment and the main types of control measures, identification of advantages and disadvantages of the main forms of knowledge testing;  secondly, the rationale for the choice of testing as the most effective means of testing and evaluation of knowledge, the allocation of the main types of tests, the rationale for the prospects of the use of electronic tests conducted using computer technology; third, the analysis of the conditions for the effective use of test control, the definition of the function of computer testing, comparative analysis of software products that provide the implementation of computer testing, the selection of the most promising of them that can improve the efficiency of testing and evaluation of students' knowledge.

scholarly journals Development of Technological Solutions for Sewer Rehabilitation Using Clinker Brick

2021 ◽  
Vol 20 (6) ◽  
pp. 499-505
Author(s):  
D. F. Goncharenko ◽  
A. I. Aleinikova ◽  
S. V. Yesakova ◽  
R. I. Hudilin
Keyword(s):  
Polymer Materials ◽  
The Finite Element Method ◽  
Corrosion Resistant ◽  
Sewer Rehabilitation ◽  
Lining Structure ◽  
Clinker Brick ◽  
Cost Of Materials ◽  
The Cost ◽  
The City ◽  
Selection Of

The aim of the work is to develop a technology for the restoration of damaged sections of sewer collectors using clinker bricks. A significant part of such collectors in the Ukraine has completely exhausted their depreciation resource. For their construction, concrete and reinforced concrete were used, which are subject to destruction as a result of the influence of many factors and, above all, microbiological corrosion. Therefore, the selection of the optimal repair technology using corrosion-resistant clinker brick is relevant. The paper considers the problems of repair and reconstruction of worn-out collectors. Technical and technological solutions of an open method for their recovery using pneumatic formwork and corrosionresistant clinker brick are presented. The design of the collector lining structure has been carried out using the finite element method. To justify the feasibility of using the proposed technology, two options for restoring a worn-out collector have been considered: the “pipe-in-pipe” method and method developed by the authors using clinker bricks. The second option in terms of the cost of materials is almost four times more economical and more expedient than the first one (where polymer materials are used). The advantage of restoring circular sewer collectors by means of laying clinker bricks lies in the durability and resistance of this material (taking into account the anticorrosive composition of concrete) to the aggressive effects of the sewer environment. It should be noted that the application of the developed restoration technology is the most appropriate in conditions of sparse building or outside the city due to the significant volume of earthworks.

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