scholarly journals Roadbed Sedimentation on Folded Bases with Weak Soils

2021 ◽  
pp. 92-98
Author(s):  
V. H Shapoval ◽  
H. P Ivanova ◽  
R. M Tereshchuk ◽  
О. V Nesterova
Keyword(s):  
Theoretical Research ◽  
Theoretical Studies ◽  
Layer By Layer ◽  
Mathematical Methods ◽  
Linear Elastic ◽  
Upper Limit ◽  
Weak Soils ◽  
Layer Stacking ◽  
Research Findings ◽  
Trapezoidal Profile

Purpose. The main purpose of the work is to construct accurate analytical dependences of the sedimentation of the roadbed base on its coordinates and the trapezoidal external load applied to the upper limit of the base. This will allow the foundation settlement profile to be calculated within and outside the embankment using the layer-by-layer stacking method. Methodology. Theoretical studies of geomechanical processes using analytical and numerical mathematical methods were applied to achieve the purpose, as well as analysis and generalization of the results of theoretical research. Findings. Analytical dependences of vertical and horizontal normal deformations on the half-plane coordinates to the upper limit of which the trapezoidal load is applied were obtained within the framework of the base model in the form of a linear elastic isotropic medium and the calculated scheme of planar deformation. On this basis, an algorithm for constructing a profile of a roadbed sedimentation made of soil materials has been developed. Originality. Analytical dependences of vertical normal deformations in the roadbed base with a trapezoidal profile on its coordinates are obtained. Practical value. The research materials presented in this work make it possible to construct the design profile of the roadbed of soil materials, taking into account the strong compressibility of the soil. In addition, the results obtained can be used to determine the lower limit of the compressible strata of the bases, to the upper limit of which a distributed load of either a triangular or a trapezoidal form is applied.

scholarly journals VERTICAL STRESS DISTRIBUTION AT THE BASE OF SOIL DAMS WITH A TRAPEZOIDAL CROSS SECTION

2021 ◽  
pp. 131-137
Author(s):  
V.H. SHAPOVAL ◽  
O.V. SKOBENKO ◽  
O.V. NESTEROVA ◽  
S. M. GAPIEIEV
Keyword(s):  
Lower Boundary ◽  
Theoretical Research ◽  
Practical Significance ◽  
Theoretical Studies ◽  
Mathematical Methods ◽  
Problem Statement ◽  
Distributed Load ◽  
Trapezoidal Shape ◽  
Trapezoidal Profile ◽  
Upper Boundary

Problem statement. The research materials outlined in this work make it possible to construct the design profile of dams from soil materials, taking into account the strong compressibility of the soil and check the strength of the foundation of soil dams in depth. In addition, the results obtained by us can be used to determine the lower boundary of the compressible thickness of the bases, to the upper boundary of which a distributed load of either a triangular or trapezoidal shape is applied. Methods. Theoretical studies of geomechanical processes using analytical and numerical mathematical methods. Analysis and generalization of the results of theoretical research. Results. In the course of writing this article, we obtained analytical dependences of stresses at the base of earth dams on the coordinates and applied to the upper boundary of the base of the trapezoidal external load and showed the methods of accounting. Scientific novelty. Analytical dependences of vertical normal at the base of a soil dam with a trapezoidal profile have been obtained. The profiles of the dam in the form of isosceles and non-isosceles trapezoids are considered. Practical significance. The research materials outlined in this work make it possible to construct the design profile of dams from soil materials, taking into account the strong compressibility of the soil and check the strength of the foundation of soil dams in depth. In addition, our results can be used to determine the lower boundary of the compressible strata of the bases, to the upper boundary of which a distributed load of either a triangular or trapezoidal shape is applied.

scholarly journals Recent Advances in Mathematical Aspects of Engineering

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 811
Author(s):  
Rahmat Ellahi ◽  
Sadiq M. Sait ◽  
Huijin Xu
Keyword(s):  
State Of The Art ◽  
Experimental Studies ◽  
The State ◽  
Original Research ◽  
Theoretical Studies ◽  
Special Issue ◽  
Mathematical Methods ◽  
Recent Advances ◽  
Engineering Problems ◽  
Research Findings

This special issue took this opportunity to invite researchers to contribute their latest original research findings, review articles, and short communications on advances in the state of the art of mathematical methods, theoretical studies, or experimental studies that extend the bounds of existing methodologies to new contributions addressing current challenges and engineering problems on “Recent Advances in Mathematical Aspects of Engineering” to be published in Symmetry.

Analysis of the Weak Soil Behavior, Modified Through Cementation

2019 ◽  
Vol 7 (1) ◽  
pp. 27-36
Author(s):  
Nadiia Kopiika ◽  
Yuriy Petrenko
Keyword(s):  
Soil Stabilization ◽  
Theoretical Research ◽  
Soil Behavior ◽  
Weak Soil ◽  
Calculation Technique ◽  
Literature Overview ◽  
Weak Soils ◽  
Chemical Technique ◽  
Increasing Demand

The purpose of the study is to conduct thorough theoretical research and literature overview regarding possible ways of soil stabilization on the basis of this practice increasing demand. In particular an emphasis is made on the chemical technique for weak soils strengthening, due to its prevalence and various practical and economic advantages. Great amount of promiscuous data was analyzed and organized; in addition on its basis an attempt is made to provide convincing calculation technique for further usage in engineering soils` stabilization practice. Besides, various factors which could influence on the results` accuracy are identified with corresponding recommendations for further possible research on this issue.

scholarly journals The Non-Stationary Metal Vapour Arc

1973 ◽  
Vol 28 (3-4) ◽  
pp. 428-437
Author(s):  
G. Ecker
Keyword(s):  
Residence Time ◽  
Critical Currents ◽  
Theoretical Studies ◽  
Velocity Dependence ◽  
Metal Vapour ◽  
Energy Characteristics ◽  
Upper Limit ◽  
Physical Background ◽  
Experimental And Theoretical Studies ◽  
Spot Motion

AbstractThe motion is depicted as a sequence of steps of a finite residence time.The spot motion affects essentially only the energy characteristics Te which in comparison to the stationary characteristics Tes are shifted to smaller values. Hereby the critical currents I0, I1 are raised in comparison to the corresponding stationary limits I0s, I1s. Particularly attractive are the phenomena found in connection with the dependence of the spot velocity ʋ on the spot current I. If the spot velocity increases with the spot current stronger than ʋ ∞ I1/2 then the E-diagram reveals the existence of an upper limit lu for the spot current. This result can be used to explain qualitatively the experimentally observed phenomena of "spot multiplicity" and “spot extinction”.Quantitative conclusions are obstructed by the lack of knowledge about the velocity dependence on the spot current, ʋ(I). Experimental and theoretical studies to provide a better understanding of the physical background and the analytical laws describing the motion of the cathode spots are urgently needed.

scholarly journals PENERBITAN JURNAL ILMIAH UNTUK MENINGKATKAN KUALITAS SUMBER DAYA MANUSIA

2010 ◽  
Vol 5 (2) ◽  
pp. 216-220
Author(s):  
B. P. Sitepu
Keyword(s):  
Human Resource ◽  
Scientific Journal ◽  
Experimental Results ◽  
Theoretical Research ◽  
Journal Articles ◽  
Academic Communities ◽  
Science Technology ◽  
Research Findings

Scientific journal is one of the periodical publications intended to widely disseminate research findings useful for research and academic communities. Articles published in the journal tend to be highly technical, representing the latest theoretical research and experimental results in the field of science, technolgy, or arts covered by the journal. Articles in the journal can be used as references and inspire researchers and scholars to do further researh. The quantity and quality of journals in a country can indicate the quality of the human resource and development of science, technology, and arts in the country. Based on the available data, the quantity and the quality of journal in Indonesia are still unsatisfactory. This article discusses some problems in managing journal and provides a number of recommendation which are useful for those publishing a journal.

scholarly journals Theoretical studies of the movement of grain moth eggs infected with the trichogram dosing and scattering device of an unmanned aerial vehicle

2020 ◽  
pp. 27-35
Author(s):  
S. O. Maranda ◽  
V. V. Adamchuk
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Coefficient Of Friction ◽  
Particle Motion ◽  
Plant Protection ◽  
Theoretical Research ◽  
Test Material ◽  
Radius Of Curvature ◽  
Theoretical Studies ◽  
The Coefficient Of Friction ◽  
Aerial Vehicle

Annotation Purpose. Determination of the influence of parameters and modes of operation of the dosing and scattering device on the speed characteristics of the movement of grain moth eggs infected with trichogramma. Methods. Theoretical studies of the process of particle motion of the test material by the dosing and scattering device were performed using the basic laws of classical theoretical mechanics. Results. On the basis of the analysis of means for settlement of a trichogram the design of the dosing and scattering device of the unmanned aerial vehicle (UAV) for settlement of a trichogram is defined. According to the results of theoretical studies, it was concluded that in order to achieve high velocity characteristics of the trichogram movement, the length of the diffuser-deflector deflector, the radius of curvature of the deflector and the angle of the deflector sector must have parameters at which the trichogram will be minimally reduced. The material from which the dosing and dispensing device is made must have the lowest possible coefficient of friction. Conclusions 1. According to the results of theoretical research it is established that with increasing: the curvature of the deflector arc from 0.03 m to 0.09 m and the angle of the deflector sector 0° to 90°, the speed of the trichogram varies from 5 m/s to 3.5 m/s. 2. To increase the width of the capture when performing the technological operation of settling the trichogram, the angle of the deflector sector should be in the range of 45–90°. 3. When changing the coefficient of friction from 0.2 to 0.9, the velocity of the particle decreases from 4.61 m/s to 3.5 m/s. With an increase in the coefficient of friction in 2 times the speed decreases by 8%. Keywords: theory of material particle motion, dosing and scattering device, unmanned aerial vehicle, biological plant protection, trichogram settlement, settlement norm, capture width.

scholarly journals Theoretical Interpretation of Traveling Interplanetary Phenomena and Their Solar Origins

1980 ◽  
Vol 91 ◽  
pp. 443-458 ◽  
Author(s):  
S. T. Wu
Keyword(s):  
Solar Wind ◽  
Wave Propagation ◽  
Interplanetary Shock ◽  
Theoretical Interpretation ◽  
Theoretical Studies ◽  
Interplanetary Shocks ◽  
Physical Processes ◽  
Mathematical Methods ◽  
Microscopic Approach ◽  
Alternative Approaches

Recent theoretical studies on Traveling Interplanetary Phenomena (TIP) and their relation or presumed relation to their solar origins will be reviewed. An attempt is made to outline the theoretical studies in the context of mathematical methods and physical processes. The following alternative approaches are examined: analytical vs. numerical methods; magnetohydrodynamics vs. hydrodynamics; processes with or without dissipation; continuum (macroscopic) vs. the kinetic (microscopic) approach. In particular, the flare-generated interplanetary shocks are used as examples to illustrate these theoretical studies within the context of TIP. Some emphasis will be placed on MHD wave propagation through the inner corona and its maturity to a fully-developed interplanetary shock. Further, their propagation and the disturbing effects on the solar wind will be considered. Cases concerning the classification and characteristics of blast-produced shocks and long-lasting ejecta are also discussed in the context of numerical simulations.

Key Role of Aspect Ratio in Optimising Local Surface Plasmon Sensitivities of Solution Phase Triangular Silver Nanoplates

2009 ◽  
Vol 1208 ◽  
Author(s):  
Denise E. Charles ◽  
Damian Aherne ◽  
Deirdre M. Ledwith ◽  
Yurii K Gun'ko ◽  
John M Kelly ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Solution Phase ◽  
Theoretical Studies ◽  
Local Surface ◽  
Ensemble Averaging ◽  
Upper Limit ◽  
Highly Sensitive ◽  
Triangular Silver Nanoplates ◽  
Key Parameter

AbstractSolution phase triangular silver nanoplate (TSNP) ensembles are herein presented as tunable, highly sensitive, LSPR sensors with excellent potential for versatile amply responsive biosensing applications. The recorded LSPR refractive index sensitivities for the highest aspect ratio TSNPs examined are amongst the highest reported to date for various other nanostructures. Calculations demonstrate that sensitivities of the TSNP sols, as high as the theoretical upper limit, are achievable by tuning the aspect ratio parameter, without any significant diminution observed due to ensemble averaging. Theoretical studies identify the aspect ratio of the nanoplates as a key parameter in controlling the LSPR sensitivity of the TSNPs.

Theoretical Research Analysis and Evaluation of Urban Sprawl - A Case Study on the Overall Planning of Kunming

2014 ◽  
Vol 1065-1069 ◽  
pp. 2832-2835
Author(s):  
Jing Zhuo Qin
Keyword(s):  
Economic Development ◽  
Urban Sprawl ◽  
Urban Geography ◽  
Theoretical Research ◽  
Theoretical Studies ◽  
Analysis And Evaluation ◽  
Subject Areas ◽  
Research Analysis

Urban sprawl studies involve various subject areas, including the urban geography, economics, sociology and ecology, etc. and it is a common topic focused by the geographers, planners, environmentalists, land economists, etc. At present, the land expansion in most cities of China is too fast, presenting the extensive economic development and urbanization model of the land extensive operation. It is badly in need of theoretical studies on the urban sprawl. In this paper, the existing domestic and foreign theoretical studies on the urban sprawl are analyzed and evaluated, and combining the overall planning of Kunming City, the urban sprawl phenomenon in Kunming is analyzed.

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