MATHEMATICAL MODELING OF OPTIMAL PARAMETERS OF ATMOSPHERIC INFLUENCE ON THE PROPERTIES OF THE SOLAR MODULE

2020 ◽  
Vol 7 (2) ◽  
pp. 58-63
Author(s):  
ERKIN IMAMOV ◽  
◽  
RAMIZULLA MUMINOV ◽  
RUSTAM RAKHIMOV ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Air Pollution ◽  
Protective Coatings ◽  
Optimal Parameters ◽  
Solar Module ◽  
Technological Factors ◽  
Natural Factors ◽  
Night And Day ◽  
Protective Structures ◽  
Working Efficiency

Technological factors of environmental impact on the protective structures of solar modules are considered. It is shown that the problem of extending the service life of solar converters is successfully solved by improving the technology of their opera-tion - indirect activities. It is shown that after each regular cleaning of the surface of the protective structures of the solar module can almost completely restore the working efficiency of its power output, even at high (up to 35%) level of reduction due to dust on the territory of our country within one to two days. The atmospheric impact on the protective structures of solar modules was calculated. The influence of the partial pressure of air particles and the large difference between night and day temperatures on the degree of dust contamination of the protective coatings of the solar module is analyzed. They are the main natural factors that reduce the output power and efficiency of solar energy to electricity converters. Keywords: dust and air pollution, climate parame

Application of the method of mathematical modeling for forecasting channel deformations at the underwater crossing of the main pipeline

2020 ◽  
Vol 10 (6) ◽  
pp. 599-609
Author(s):  
Valery А. Gruzdev ◽  
◽  
Georgy V. Mosolov ◽  
Ekaterina A. Sabayda ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Roughness Coefficient ◽  
Computational Domain ◽  
Channel Deformations ◽  
Geological Surveys ◽  
Kuban River ◽  
The Stability ◽  
Protective Structures

In order to determine the possibility of using the method of mathematical modeling for making long-term forecasts of channel deformations of trunk line underwater crossing (TLUC) through water obstacles, a methodology for performing and analyzing the results of mathematical modeling of channel deformations in the TLUC zone across the Kuban River is considered. Within the framework of the work, the following tasks were solved: 1) the format and composition of the initial data necessary for mathematical modeling were determined; 2) the procedure for assigning the boundaries of the computational domain of the model was considered, the computational domain was broken down into the computational grid, the zoning of the computational domain was performed by the value of the roughness coefficient; 3) the analysis of the results of modeling the water flow was carried out without taking the bottom deformations into account, as well as modeling the bottom deformations, the specifics of the verification and calibration calculations were determined to build a reliable mathematical model; 4) considered the possibility of using the method of mathematical modeling to check the stability of the bottom in the area of TLUC in the presence of man-made dumping or protective structure. It has been established that modeling the flow hydraulics and structure of currents, making short-term forecasts of local high-altitude reshaping of the bottom, determining the tendencies of erosion and accumulation of sediments upstream and downstream of protective structures are applicable for predicting channel deformations in the zone of the TLUC. In all these cases, it is mandatory to have materials from engineering-hydro-meteorological and engineering-geological surveys in an amount sufficient to compile a reliable mathematical model.

Mathematical Modeling of Betanin Extraction from Red Beet (Beta vulgaris L.) by Solid–Liquid Method

2015 ◽  
Vol 11 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Honggao Xu ◽  
Qiang Peng ◽  
Fang Yuan ◽  
Yanxiang Gao
Keyword(s):  
Mathematical Modeling ◽  
Effective Diffusion ◽  
Spherical Model ◽  
Extraction Process ◽  
Extraction Temperature ◽  
Optimal Parameters ◽  
Practical Application ◽  
Sulfurous Acid ◽  
Red Beet ◽  
Solid Liquid

Abstract Effective diffusion coefficient (D-value) is an important parameter for the extraction process. In this study, a cylindrical model to estimate the D-value of betanin extraction from red beet roots was developed. The influence of extraction temperature, pH, cylindrical thickness and type of acids on the D-value was also investigated. The optimal parameters of betanin extraction were 30°C, pH 4.0 adjusted with sulfurous acid or acetic acid. D-values under the above conditions were 18.95×10−11 m2/s and 17.87×10−11 m2/s, respectively. The result showed that D-value elevated with the increase of cylindrical thickness, which was consistent with earlier conclusion from spherical model. The modeling may be useful for the investigation into extraction process and practical application.

scholarly journals The use of mathematical modeling methods for solving geo-ecological problems of sustainable development of regions

2020 ◽  
Vol 161 ◽  
pp. 01005
Author(s):  
M V Volik
Keyword(s):  
Mathematical Modeling ◽  
Air Pollution ◽  
Sustainable Development ◽  
Numerical Study ◽  
Digital Technologies ◽  
Motor Vehicles ◽  
Gaseous Pollutants ◽  
Mathematical Apparatus ◽  
Modeling Methods ◽  
Ecological Problems

Currently, a number of environmental problems have a significant impact on the stable economic development of the country. A global problem is the study of air pollution. The solution of such geoecological problems should be carried out with the use of modern mathematical apparatus and digital technologies. The paper presents the results of a numerical study of the distribution of gaseous pollutants emitted by motor vehicles in the pedestrian zone of streets. It is shown that the vortex structures formed in the studied city buildings development have a significant impact on the accumulation of anthropogenic impurities.

Mathematical modeling of photochemical air pollution—III. Evaluation of the model

1974 ◽  
Vol 8 (6) ◽  
pp. 563-596 ◽  
Author(s):  
Steven D. Reynolds ◽  
Mei-Kao Liu ◽  
Thomas A. Hecht ◽  
Philip M. Roth ◽  
John H. Seinfeld
Keyword(s):  
Mathematical Modeling ◽  
Air Pollution

scholarly journals Mathematical Modeling of Dynamics of the Number of Specimens in a Biological Population Under Changing External Conditions on the Example of the Burzyan Wild-Hive Honeybee (Apismellifera L., 1758)

2017 ◽  
Vol 12 (1) ◽  
pp. 224-236
Author(s):  
Л.С. Ибрагимова ◽  
L.S. Ibragimova
Keyword(s):  
Mathematical Modeling ◽  
Model Parameters ◽  
Natural Factors ◽  
Biological Population ◽  
Ricker Model ◽  
Republic Of Bashkortostan ◽  
External Conditions ◽  
The Republic ◽  
Modeling Of Dynamics ◽  
Periodic Changes

The usage of a non-autonomous discrete model (Ricker model) for describing the dynamics of a biological population is considered. It is shown that in case of periodic changes in parameters, the model can be reduced into equivalent autonomous system. The problems of determining the model parameters in a situation where these parameters depend on time are discussed. As an application, the problem of mathematical modeling of the dynamics of the number of families of the natural population of the Burzyan wild-hive honeybee living on the territory of the Republic of Bashkortostan is considered. The results convincingly demonstrate the fact that the dynamics of the Burzyan Wild-Hive Honeybee is significantly influenced by a combination of natural factors. For example the sum of the precipitation in February is particularly significant here (in particular, the increase in precipitation affects the number of bees negatively) and the temperature values in March, April and June.

scholarly journals Investigation of the operation of vibration-centrrifugal installation for automobile parts machining

2021 ◽  
Vol 1 (101) ◽  
pp. 79-88
Author(s):  
Oleg Lyashuk ◽  
Leonid Serilko ◽  
Ivan Hevko ◽  
Olexander Kondratiuk ◽  
Oleg Tsion ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Kinetic Energy ◽  
Treatment Process ◽  
Rotational Velocity ◽  
Parameters Optimization ◽  
Optimal Parameters ◽  
Process Parameters Optimization ◽  
Vibration Treatment ◽  
Machine Parts

The scheme of vibration-centrifugal installation, providing the increase of productivity and efficiency of machine parts vibration treatment is presented in this paper. The influence of the treated environment on the technological vibration treatment process and determination of its optimal parameters is investigated on the basis of mathematical modeling. Graphical dependences of specific kinetic energy on the crank rotational velocity at different values of the fork rotational velocity are presented. Effective ways of technological process parameters optimization and new ways of its development are identified.

scholarly journals Optimal conditions of acid modification of Bentonite-Like Clay

2021 ◽  
Vol 30 ◽  
pp. 02006
Author(s):  
Natalya Gorbunova ◽  
Aleksandr Vezentsev
Keyword(s):  
Mathematical Modeling ◽  
Sulfuric Acid ◽  
Calculation Method ◽  
Optimal Conditions ◽  
Optimal Parameters ◽  
Acid Modification ◽  
Modification Process

The results of mathematical modeling of the bentonite-like clay’s process of modifying various concentrations sulfuric acid depending on time the modification process is given in the presented article. As a result, the optimal parameters of this process were determined by the experimental and calculation method.

scholarly journals Experimental and theoretical researches of high-speed interaction of thin obstacles with a metal fragment

2019 ◽  
Vol 221 ◽  
pp. 01043
Author(s):  
Svetlana Afanasyeva ◽  
Viktor Burkin ◽  
Aleksey Dyachkovsky ◽  
Alexandr Ishchenko ◽  
Konstantin Rogaev ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Titanium Alloy ◽  
Continuum Mechanics ◽  
High Speed ◽  
Interaction Process ◽  
Actual Problem ◽  
Cost Weight ◽  
Ballistic Resistance ◽  
Protective Structures ◽  
Metal Fragment

The development of lightweight protective structures of increased ballistic resistance is not an easy task, since often there are conflicting requirements in terms of cost, weight, thickness, materials availability, processability, etc. To assess the effectiveness of protective structures one should use methods that allow to research the obstacles destruction when collided with high-speed particles. The paper is devoted to the actual problem of studying the ballistic stability of thin barriers made of various protective materials (steel, titanium alloy, ceramics, metal ceramics) when interacting with a metal fragment simulator a spherical steel drummer in the range of interaction speeds of about 2500 m/s. An experimental technique has been developed to study the most important indicators: the depth of a crater in an obstacle, a fragment’s velocity drop when interacting with protection, the obstacle’s and splinter’s fragments scattering in overgraded space. Mathematical modeling was carried out within the framework of continuum mechanics, which adequately describes the interaction process of the drummer and the obstacle under various impact conditions.

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