scholarly journals Optimization of repair mortar used in masonry restoration

Spatium ◽  
2019 ◽  
pp. 8-15 ◽  
Author(s):  
Aleksey Kharitonov ◽  
Olga Smirnova
Keyword(s):  
Boundary Conditions ◽  
Mathematical Modelling ◽  
Contemporary Problem ◽  
Experiment Planning ◽  
Optimal Composition ◽  
Repair Mortar ◽  
Short Period ◽  
Masonry Material ◽  
Planning Methods ◽  
Materials Used

Deterioration of ancient masonry is a contemporary problem. The initial properties of the masonry material that determine its durability, deterioration and degree of preservation have led to the appearance of different approaches towards choosing the technology for restoring masonry. The success of any restoration is largely determined by its compatibility with the original materials used, which requires, as a rule, a complex and long process of selecting their composition. One of the main technological approaches in the science of restoration materials is to search for the optimal composition of the material within a given time limit. This paper presents an approach which uses a large number of variables within strict boundary conditions. The solution to this problem can be found in the field of mathematical modelling using experiment planning methods. The paper presents a method developed for mortar optimization which makes it possible to obtain the desired result within a relatively short period of time.

Special Mortars for Repair Masonry: The Problem of the Optimization

2015 ◽  
Vol 1122 ◽  
pp. 78-81
Author(s):  
Aleksey Kharitonov ◽  
Olga Smirnova
Keyword(s):  
Mathematical Modeling ◽  
Boundary Conditions ◽  
Materials Science ◽  
Optimal Composition ◽  
Rigid Boundary ◽  
Short Period ◽  
Short Time ◽  
Technological Methods ◽  
Planning Of Experiments

Destruction masonry is a common problem. The nature of the material of masonry and the degree of preservation offers different combinations of technological methods of repair. In this regard it has formulated one of the main tasks of restoration materials science - finding the optimal composition of a material with a large number of variables in the presence of rigid boundary conditions in a short time. The solution to this problem lies in the area of mathematical modeling using the methods of planning of experiments. In this regard the aim of this study is the development of methods for optimization of mortars that allows getting the desired result in a relatively short period of time.

scholarly journals Verification of normal distribution of welding distortions

2019 ◽  
Vol 91 (3) ◽  
Author(s):  
Damian Grzesiak ◽  
Jarosław Plichta
Keyword(s):  
Statistical Analysis ◽  
Standard Deviation ◽  
Normal Distribution ◽  
Sheet Metal ◽  
Welding Process ◽  
Experiment Planning ◽  
Geometrical Parameters ◽  
Butt Welds ◽  
Planning Methods ◽  
Smirnov Test

The aim of this paper is to answer the question of the distribution of welding distortions. The MIG method was used to make 31 butt welds of 0H18N9 sheet metal, of 6 mm thickness and dimensions 150x350 mm. All joints are made with constant parameters of the welding process. Statistical analysis of the distribution and Kolomogorov-Smirnov test were used in this paper. On the grounds of the analysis it was proved that the distribution of welding deformations is a normal distribution. This justifies the use of experiment planning methods and the use of average values. The relatively high value of the standard deviation makes it necessary to take into account the geometrical parameters of the joint.

Experimental Study of the Corrosion Behaviors on the Rod and Tube Material in Oil Pumping Wells

2011 ◽  
Vol 239-242 ◽  
pp. 1790-1793
Author(s):  
You Qiang Wang
Keyword(s):  
Production Efficiency ◽  
Electrochemical Corrosion ◽  
Oil Production ◽  
Oil Well ◽  
Chemical Corrosion ◽  
Electrode Potentials ◽  
Short Period ◽  
Corrosion Experiment ◽  
Corrosion Behaviors ◽  
Materials Used

To study the corrosion behaviors on the rod and tube materials used in oil well is very important for prolonging oil well repairing periods, lowering oil production maintenance costs and increasing oil production efficiency. Through selecting some kinds of tube and rod materials which are always used in oilfield, chemical corrosion experiment and electrochemical corrosion experiment were carried out under different conditions. The results show that the corrosion rates are accelerated with material prestress increasing, liquid mineralization rate and temperature rising. The nitrified materials have better corrosive resistance than untreated materials. The electrochemical corrosion experiment results show that the electrode potentials of four materials (45, 20CrMo, J55, N80) have tiny difference and don’t exceed 20mV. The bimetallic corrosion tests show that the couple corrosion of the four selected materials pair can be ignored under short period and oxygen conditions.

scholarly journals Evaluation of Dynamic Methods for Earthwork Assessment

2015 ◽  
Vol 11 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Jozef Vlček ◽  
Dominika Ďureková ◽  
Katarína Zgútová
Keyword(s):  
Boundary Conditions ◽  
Quality Evaluation ◽  
Civil Engineering ◽  
Rapid Development ◽  
Road Construction ◽  
Fine Grained ◽  
Dynamic Methods ◽  
Short Period ◽  
Parallel Measurements ◽  
Construction Works

Abstract Rapid development of road construction imposes requests on fast and quality methods for earthwork quality evaluation. Dynamic methods are now adopted in numerous civil engineering sections. Especially evaluation of the earthwork quality can be sped up using dynamic equipment. This paper presents the results of the parallel measurements of chosen devices for determining the level of compaction of soils. Measurements were used to develop the correlations between values obtained from various apparatuses. Correlations show that examined apparatuses are suitable for examination of compaction level of fine-grained soils with consideration of boundary conditions of used equipment. Presented methods are quick and results can be obtained immediately after measurement, and they are thus suitable in cases when construction works have to be performed in a short period of time.

Nouvelles conditions aux limites exactes pour les champs électromagnétiques à la surface des matériaux absorbants

1983 ◽  
Vol 61 (2) ◽  
pp. 332-347 ◽  
Author(s):  
Pierre Langlois ◽  
Alberic Boivin
Keyword(s):  
Boundary Conditions ◽  
Diffraction Theory ◽  
Visible Range ◽  
Scalar Diffraction ◽  
Edge Diffraction ◽  
Conditions Aux Limites ◽  
Exact Boundary ◽  
Good Conductor ◽  
Diffraction Patterns ◽  
Materials Used

Recent experiments using laser light by Langlois et al. have shown for the first time that actual diffraction patterns from edges do depend on the material and ridge shape of the scatterer, as well as on the polarization of the incident wave. These results have brought out the inadequacy of the scalar diffraction theory for diffraction angles larger than about 1°. Farther out one must use exact electromagnetic theory, with the attendant requirement that exact boundary conditions be known for the fields on the surface of the scattering object. These boundary conditions are well known for perfect conductors (Neumann's or Dirichlet's conditions) or even for good conductors (Leontovich's conditions). However, in the visible range one finds that copper is not a good conductor. Therefore, we develop in the present paper new exact boundary conditions, which generalize those of Leontovieh. In actual fact our new boundary conditions have enabled us to perform edge diffraction calculations for a considerably larger range of complex refraction indices covering the materials used. More generally one may claim that our boundary conditions do apply for all usual materials (copper, aluminium, ebonite … ), in as much as they are absorbing and the local ridge curvature of the scattering objects is far larger than the wavelength.

scholarly journals A NON-ALCOHOLIC BEVERAGE FOR PREVENTION AND COMPREHENSIVE TREATMENT OF POST-TRAUMATIC OSTEOARTHRITIS IN PROFESSIONAL AND AMATEUR SPORT

2020 ◽  
Vol 20 (2) ◽  
pp. 116-124
Author(s):  
O Tolmachev ◽  
A Vekovtsev ◽  
A Bykov ◽  
V Pozniakovskiy
Keyword(s):  
High Performance ◽  
Alcoholic Beverage ◽  
Cartilage Tissue ◽  
Comprehensive Treatment ◽  
Plant Materials ◽  
Short Period ◽  
Post Traumatic ◽  
Materials Used ◽  
Biological Complexes ◽  
Main Components

Aim. The article aims to develop a non-alcoholic beverage for post-traumatic recovery of the structure and functions of cartilage tissue in professional and amateur athletes. Materials and methods. The materials used were a premix containing aquamin soluble (a natural source of calcium), glucosamine sulfate (a chondroprotector) and herbal components, as well as laboratory and industrial samples of a sports beverage. To assess the quality of the flavor syrup and the finished drink, generally accepted and special research methods were used including spectrophotometry, high performance liquid chromatography, and inverse voltammetry. Results. Beverage composition is scientifically substantiated based on the characteristics and functional properties of the ingredient composition. The main components of the formulation are premix 124-19, “Eleutherococcus” flavor and “Ginseng with herbs” flavor concentrated bases along with extracts of plant materials with synergistic properties for correcting metabolic processes in post-traumatic osteoarthritis. The novelty of the formulation is confirmed by the patent of the Russian Federation. There are evidence-based medical studies on the effectiveness and functional orientation of calcium and glucosamine in dietary supplements. A technology was developed for the extraction of plant materials, the innovativeness of which is the use of high pressure (100–200 MPA) for a short period of time (60–600 s). The formulation and technology of the beverage are tested in production conditions and are recommended for implementation. Conclusion. Sports beverages based on natural biological complexes can be effective for correcting metabolic disorders and maintaining health in post-traumatic osteoarthritis in professional and amateur sports.

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