scholarly journals FORMATION OF BEGINNING AND BORDER CONDITIONS OF THERMAL LOCALIZATION OF THE EMERGENCY SITUATION ASSOCIATED WITH CHEMICAL-DAMAGES

2020 ◽  
Vol 1 (154) ◽  
pp. 293-297
Author(s):  
V. Strelets ◽  
R. Shevchenko
Keyword(s):  
Mathematical Model ◽  
Boundary Conditions ◽  
Thermal Destruction ◽  
Emergency Situation ◽  
Hazardous Substances ◽  
Protective Device ◽  
Mathematical Apparatus ◽  
Dangerous Substances ◽  
Initial And Boundary Conditions ◽  
The Impact

The urgent problem of formation of initial and boundary conditions of mathematical model of emergency localization with the help of a two-level dome-shaped protective device in case of forced thermal destruction of the device of impulse damage of chemical-dangerous substances is solved in the work. The solution to this problem was based on the hypothesis of the possibility of rapid application of a two-level protective device for the thermal localization of a cell of emergencies related to the impulse lesion of chemically dangerous substances. According to the hypothesis, approaches to the formation of a mathematical apparatus, which consists of a mathematical model of prevention of an emergency of a similar nature, the control algorithm and methods for their practical application, are determined. In order to implement this approach, the paper analyzes the current state of formation of the mathematical apparatus, identifies the existing shortcomings of the existing models. In order to eliminate the latter, the impact of characteristic technical and operational conditions on the effectiveness of localization of emergency situation related to the threat of impulse emission of chemical hazardous substances was analyzed. In the course of the research it was proved that the formation of recommendations for reducing the time of localization of the consequences of emergencies related to the threat of impulse release of chemical-dangerous substances by means of a two-level protective device requires obtaining a multifactor mathematical model of emergency prevention taking into account its initial and boundary conditions. The final step was to determine the initial and boundary conditions of a multifactor mathematical model that describes the behavior of the emergency prevention process. Based on this, further research should be aimed at developing a mathematical model of emergency prevention related to the threat of impulse release of chemical-dangerous substances and appropriate methodology based on it, which will reduce the time of localization of the consequences of an emergency without changing the level of safety of civilians and personal the composition of the emergency rescue unit with the help of a mobile protective device. Keywords: thermal destruction, emergency, chemical hazardous substances, protective device

scholarly journals Mathematical model for determining the limit load capacity of an energy-intensive profile of class 4

2018 ◽  
Vol 19 (9) ◽  
pp. 133-136
Author(s):  
Dominik Gałdyński
Keyword(s):  
Mathematical Model ◽  
Cross Section ◽  
Load Capacity ◽  
Limit Load ◽  
Stress And Strain ◽  
Mathematical Apparatus ◽  
Load Bearing Capacity ◽  
Automotive Body ◽  
The Impact

The article discusses the process of stress and strain changes for an energy-intensive profile with a square cross-section as a result of axial compression, expressed using a mathematical apparatus that allows determination of the load-bearing capacity of such a profile, the use of which in the form of stringers is found in modern automotive body constructions . Elements, such as the so-called a zone of controlled crumpling, taking over part of the impact energy, at the same time being responsible for the progressive nature of the deformation of this area.

scholarly journals MATHEMATICAL MODEL OF UNDERWATER DEMINING BY DIPPER DIVERS OF THE SESU

2021 ◽  
Vol 6 (166) ◽  
pp. 175-183
Author(s):  
I. Soloviev
Keyword(s):  
Mathematical Model ◽  
Emergency Response ◽  
Emergency Situation ◽  
Response Process ◽  
Special Means ◽  
Operational Activities ◽  
Definition Of ◽  
The Impact ◽  
The Mathematical Model ◽  
Technical Recommendations

It is shown that the problem of improving the effectiveness of prevention of emergencies related to the underwater location of explosive objects is relevant. An important and unresolved part of the problem is the lack of a mathematical model of the emergency response process associated with the underwater location of an explosive device in general. Based on this, the object of the study was the elimination of an emergency situation related to the underwater location of explosive objects, and the subject of the study – the process of operational activities of personnel of the underwater demining department of a group of special diving rescue team. The aim of the work is to develop a mathematical model of the emergency response process related to the underwater location of an explosive object as a process of functioning of the system "emergency – special means of underwater demining – diver-sapper", which should be the basis for substantiation of operational and technical recommendations. increasing the efficiency of underwater demining by diver sappers without reducing their level of safety. It is shown that the mathematical model of underwater demining by a diver-sapper is a system of three analytical dependences. The first is a functional that describes the process of underwater demining in the form of a three-factor polynomial model. The second allows us to present this functionality as a set of one-factor models. The third provides the definition of weights in solving a multifactor problem. It is noted that such a model allows to proceed to the substantiation of operational and technical recommendations to the management of the group of special diving works. The advantage of the new scientific result is the ability to obtain both quantitative estimates of the impact of the direct components of the system "diver-sapper – special means of underwater demining – underwater location of an explosive object" and their relationship. The disadvantage is the large number of experimental results that must be obtained to implement the selected plan.

scholarly journals MM5 simulation of the 1999 Orissa Super Cyclone : Impact of bogus vortex on track and intensity prediction

MAUSAM ◽  
2021 ◽  
Vol 57 (1) ◽  
pp. 129-134
Author(s):  
R. G. ASHRIT ◽  
M. DAS GUPTA ◽  
A. K. BOHRA
Keyword(s):  
Boundary Conditions ◽  
Mesoscale Model ◽  
Intensity Prediction ◽  
Super Cyclone ◽  
Initial And Boundary Conditions ◽  
Orissa Coast ◽  
The Impact

lkj & bl v/;;u esa 29 vDrwcj] 1999 dks mM+hlk ds rV ij vk, egkpØokr ds izfr:i.k ds fy, ,u- lh- ,- vkj@ih- ,l- ;w-  ,e- ,e- 5 eslksLdsy fun’kZ ¼xzsy bR;kfn 1995½ dk mi;ksx fd;k x;k gsA bl fun’kZ esa pØokr dh izkjafHkd voLFkk vkSj mldh ifjlhekvksa dh voLFkkvksa ds :i  esa jk"Vªh; e/;&vof/k ekSle iwokZuqeku dsUnz Vh- 80 ds izpkyukRed fo’ys"k.kksa dk iz;ksx fd;k x;k gS vkSj rwQku dh vof/k esa 3 fnu rd dk iwokZuqeku rS;kj djus ds fy, bl fun’kZ dks 72 ?kaVs dh vof/k ds fy, lekdfyr fd;k x;k gSA bl v/;;u dk mn~ns’; pØokr ds ekxZ ij dfYir Hkzfey ds izHkko dk ewY;kadu djuk vkSj pØokr dh rhozrk dk iwokZuqeku yxkuk gSA In this study NCAR/PSU MM5 mesoscale model (Grell et al. 1995) is used to simulate the super cyclone that struck the Orissa coast on 29th October 1999. The model makes use of the operational NCMRWF T 80 analysis as initial and boundary conditions and is integrated up to 72 hr for producing 3-day forecast of the storm. The aim of this study is to assess the impact of bogus vortex on track and intensity prediction. 

scholarly journals FORMATION OF MATHEMATICAL APPARATUS OF METHODS OF FIRE AND EXPLOSION SAFETY CONTROL OF LANDFILL

2021 ◽  
Vol 3 (2) ◽  
pp. 18-28
Author(s):  
N. Rashkevich ◽  
◽  
А. Pastukhova ◽  
V. Konoval ◽  
V. Slovinskyi ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Solid Waste ◽  
Emergency Response ◽  
Waste Disposal ◽  
Household Waste ◽  
Mathematical Apparatus ◽  
Solid Waste Disposal ◽  
Fire And Explosion ◽  
Fire And Explosion Hazards ◽  
Initial And Boundary Conditions

The authors analyze the fire and explosion hazards of solid waste disposal facilities, taking into account current trends in the introduction of biogas (methane) collection and utilization systems. Methane is considered an alternative energy source for power plants. The authors determined the initial and limiting conditions of the mathematical apparatus of the method of combating fire and explosion hazards of solid waste disposal facilities based on the results of analysis and synthesis of factors of occurrence and spread of man-caused danger, existing mathematical models, and methods of counteracting man-caused danger. This is the basis for the further development of appropriate emergency response techniques. During the analysis, the authors found that humidity, the temperature of the landfill (household waste), the presence of sufficient oxygen at some point in time initiate the formation of explosive concentrations of methane in the array and contribute to the spread of hazards in landfills or dumps. The specific weight of the organic component, the value of the density of the array, the height of the landfill affect the process of counteracting the danger, namely the prevention of dangerous events and prevention of emergency from the object to the highest level of distribution (local level), primarily in the first group priorities, such as the number of victims and injured civilians and specialists of the units of the State Emergency Service of Ukraine. The team of authors has defined a system of equations of connection of the existence of the mathematical device taking into account initial and boundary conditions. A system of communication equations is determined taking into account the initial and boundary conditions of the mathematical apparatus, which allows to further develop a control algorithm for emergency response related to fire and explosion hazardous landfills close to settlements.

scholarly journals Modeling enterprises’ economic security in crisis conditions

2021 ◽  
pp. 116-121
Author(s):  
H Blakyta ◽  
O Bogma ◽  
O Bolduieva ◽  
V Lukyanov ◽  
I Shtuler
Keyword(s):  
Mathematical Model ◽  
Scientific Research ◽  
Economic Security ◽  
Mathematical Apparatus ◽  
Qualitative Comparison ◽  
Industrial Enterprises ◽  
Mathematical Formalization ◽  
Crisis Conditions ◽  
The Impact ◽  
The Mathematical Model

Purpose. To create a mathematical model for assessing, analyzing and forecasting the economic security of the enterprise in a crisis. To create an algorithm for assessing the levels of economic security. Methodology. In the scientific research, the results of which are given in the presented article, general and special methods of cognition were used. The method of logical generalization is used to substantiate the relevance of the topic, purpose and objectives of the study, to determine the essential features of indicators of economic security of the enterprise. The method of comparative analysis, quantitative and qualitative comparison is used to identify an integrated indicator that correlates with the characteristics of economic security and to provide analytical and predictive results of profitability of all activities of the enterprises of the industry and on its separate branches. The method of mathematical formalization is used for the formation of a mathematical model and algorithm for assessing the level of threat to the economic security of the enterprise. Findings. It is proposed to create a mathematical model by integrating individual blocks that use different mathematical approaches. This model is designed for analytical study on various aspects of economic security of the enterprise. Algorithms are proposed for estimating the levels of economic security (critical, dangerous, unsatisfactory, satisfactory, optimal ones) and also determining them using an integrated indicator that characterizes these levels; finding its deterministic, probabilistic and fuzzy components; a step-by-step increase in the relevance of the analysis of the level of economic security. It is also proposed to compare the effects of the crisis on enterprises in different industries and to gradually calculate integrated indicators in the areas of economic security for a homogeneous group of enterprises selected by industry, size and region. This provides an opportunity to see more broadly the threats and depth of the crisis and to implement measures to neutralize its consequences more effectively. Originality. The mathematical model for assessing and forecasting the economic security of enterprises in crisis conditions has been created. It is proposed to conduct a permanent rapid analysis and forecast of the impact of the crisis on the economic security of the enterprise using a standardized integrated index of economic security. An algorithm of step-by-step increase in relevance of the analysis of the level of economic security is introduced. Practical value. The developed mathematical apparatus can be used both for scientific research on various aspects of economic security of enterprises, and for practical purposes to predict the impact of the consequences of the economic crisis and implement measures to prevent them. Using this mathematical apparatus, the analysis and forecast of profitability of industrial enterprises as a whole and by its individual branches were carried out. The results of this analysis can be used by the management of small, medium and large enterprises to develop production plans in a crisis.

scholarly journals DEVELOPMENT OF THE BASIS OF THE METHOD OF CONTROL OF THE EMERGENCY SITUATION RELATED TO FIRE AND EXPLOSION SAFETY OF LANDFILL

2021 ◽  
Vol 6 (166) ◽  
pp. 156-162
Author(s):  
N. Rashkevich ◽  
V. Shershnyov ◽  
A. Kondratiev ◽  
О. Shevchenko
Keyword(s):  
Boundary Conditions ◽  
Solid Waste ◽  
Waste Disposal ◽  
Emergency Situation ◽  
Specific Weight ◽  
Organic Component ◽  
Mathematical Apparatus ◽  
Explosion Safety ◽  
Solid Waste Disposal ◽  
Fire And Explosion

It is established that today there is no effective mathematical apparatus that adequately describes the process of preventing a dangerous event and preventing an emergency related to fire and explosion of solid waste disposal facilities close to settlements. The initial and boundary conditions of the existence of the mathematical apparatus are determined, which is the basis for the development of methods of counteracting the emergency. Humidity, the temperature of the landfill, the presence of oxygen at a certain point in time are factors that initiate the danger. The specific weight of the organic component, the value of the density of the array, the height of waste disposal affect the process of counteracting the danger.

scholarly journals STUDY OF THERMAL destruction OF POLYVINYL CHLORIDE FLOORING

2021 ◽  
pp. 109-114
Author(s):  
Е.В. Чернушевич ◽  
П.В. Ширинкин ◽  
Ю.Н. Безбородов
Keyword(s):  
Polyvinyl Chloride ◽  
Building Materials ◽  
Thermal Destruction ◽  
Hazardous Materials ◽  
Combustion Products ◽  
Hazardous Substances ◽  
Analysis Method ◽  
Fire Hazards ◽  
Time Calculation ◽  
The Impact

В существующей системе оценки безопасности строительных материалов не учитываются параметры термической деструкции материалов при воздействии температур, значения которых ниже температуры их тления, что не позволяет в полной мере оценить опасность строительных материалов и их влияние на здоровье человека; степень участия строительных материалов в формировании опасных факторов пожара, а также их влияние на динамику пожара. Целью работы является экспериментальное исследование термической деструкции напольных покрытий из поливинилхлорида на различной основе и оценка опасности данного процесса. Изучение деструкции и её динамики заключалось в определении потери массы образцов и расчете скорости деструкции, а оценка опасности – в отборе газовоздушной среды, образующейся в результате термической деструкции образцов, и проведении её анализа. Изучение деструкции осуществлялось с помощью метода изотермического термогравиметрического анализа, а оценка опасности – с помощью метода анализа выделяющихся газов. По результатам экспериментального исследования получены значения потери массы образцов в результате термической деструкции, установлено влияние времени и температуры на динамику термической деструкции, проведена оценка опасности термической деструкции исследуемых материалов. Установлено, что напольные покрытия из ПВХ являются пожароопасными и склонными к термической деструкции при температурах, значения которых ниже температуры их тления. При воздействии температуры напольные покрытия из ПВХ разрушаются с образованием пожароопасных веществ, что необходимо учитывать при: оценке пожарной опасности материалов; нормировании применения отделочных материалов в зданиях различного функционального назначения; моделировании динамики развития пожара и расчете времени достижения предельно допустимых значений концентраций токсичных газообразных продуктов на путях эвакуации. The existing system of hazardous building materials assessment does not take into account the materials thermal destruction parameters within temperature range below its smoldering phase. This fact does not fully allow to assess the impact of hazardous building materials on human health, the extent of building materials’ effect in the fire hazards formation, as well as its influence on the fire propagation. The aim of the work is the experimental studying of different type polyvinyl chloride floorings’ thermal destruction and assessing the hazards of this process. The study of destruction process and its’ development consisted in samples’ weight loss determining and the destruction rate calculating. The destruction hazards assessment lied in analyzing the gas-air environmental samples being emitted due to materials’ thermal destruction. The thermal destruction research was carried out using isothermal thermogravimetric analysis method. The hazardous destruction assessment was performed using the evolved gases analysis method. The experiment resulted in acquiring the samples’ mass loss data in case of thermal destruction, defining the impact of duration and temperature on thermal destruction development, and assessing studied materials’ thermal destruction hazards. It has been established that PVC floorings are fire hazardous materials, which are prone to thermal degradation at temperatures below their smoldering temperature. When being heated PVC floorings are degradating, what is accompanied by fire hazardous substances emitting. This should be taken into consideration for hazardous materials type assessment; standardization of furnishing materials usage in various purposes buildings; fire development model construction, and time calculation of reaching toxic combustion products’ maximum permissible concentration along the escape routes.

scholarly journals Sensitivity analysis of surface ozone to modified initial and boundary conditions in both rural and industrial zones

2008 ◽  
Vol 2 (1) ◽  
pp. 113-118 ◽  
Author(s):  
N. Castell ◽  
A. F. Stein ◽  
R. Salvador ◽  
E. Mantilla ◽  
M. Millán
Keyword(s):  
Boundary Conditions ◽  
Surface Ozone ◽  
Three Dimensional ◽  
Chemical Species ◽  
Mass Conservation ◽  
Air Quality Model ◽  
Quality Model ◽  
Rural Zone ◽  
Initial And Boundary Conditions ◽  
The Impact

Abstract. A three-dimensional air quality model based on a set of chemical species mass conservation equations describes the time evolution of chemical species in the atmosphere. In order to solve this set of equations, proper choices of initial and boundary conditions are needed. Ideally, initial and boundary conditions should be determined on the basis of observations. However, since such high-resolution observations are generally not available, it becomes necessary to use other information sources to specify the initial and boundary values. The fact that both the initial and the boundary conditions are specified with some degree of presumption makes it important to evaluate their influence in the model results. In this paper we present a study of the impact of initial and boundary concentrations on the modelled surface ozone concentration over two environments: Huelva and Badajoz, an industrial and a rural zone, respectively. The impacts are analysed for the same meteorological period (10–15 August 2003).

Public procurement quality assessment of a region: regression analysis

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Olga S. Belokrylova ◽  
Kirill A. Belokrylov ◽  
Sergey S. Tsygankov ◽  
Vadim A. Syropyatov ◽  
Elena D. Streltsova
Keyword(s):  
Mathematical Model ◽  
Regression Analysis ◽  
Public Procurement ◽  
Mathematical Apparatus ◽  
Content Type ◽  
Correlation And Regression Analysis ◽  
The Impact ◽  
The Mathematical Model ◽  
Functional Attribute

PurposeThe paper aims to present the results of a study aimed at constructing economic and mathematical models used in decision-making in the management of budget procurement of a region, contributing to the efficient use of budget funds. One of the key problems in this area is the assessment of the quality of procurementDesign/methodology/approachOne of the key problems in this area is the assessment of the quality of procurement, the solution of which requires the application of economic and mathematical methods, models, tools and algorithms built into information systems for supporting decision-making. The introduction of these systems brings to a qualitatively new level the system of relations between subjects of budget procurement. The paper analyzes modern publications on the implementation of public procurement and related issues of efficiency (savings) of budgetary funds.FindingsThe indicators on the basis of which the evaluation of the quality of regional procurement is determined are proposed. The architecture of the information system for decision support in the evaluation of procurement quality has been developed. The system has the property of adapting to changes in the state of the environment through the constant accumulation of statistical data characterizing the procurement and adjustment of the parameters of the mathematical model in accordance with them. A mathematical model is built into the control loop that allows ranking the indicators of budget purchases by the degree of their influence on the effective attribute. The role of a functional feature is the quality of budget procurement. The mathematical model is based on the application of the mathematical apparatus of correlation and regression analysis. The impact of each of the factor attributes on the functional attribute has been assessed.Originality/valueThe mathematical model is based on the application of the mathematical apparatus of correlation and regression analysis. The impact of each of the factor attributes on the functional attribute has been assessed. Real statistics are given that characterize budget procurements carried out in retrospect. The coefficients of the linear regression model are determined based on the use of the STATISTICA application software package. The proposed decision support information system with a regression model built into it allows one to make scientifically and quantitatively sound decisions when assessing the quality of budget purchases of a region.

scholarly journals Improvement of methodology of justification of safe routes for transportation of dangerous substances and cargo

2020 ◽  
pp. 112-117
Author(s):  
R. V Petruk ◽  
O. V Lunova ◽  
V. S Garkushevskiy
Keyword(s):  
Emergency Situation ◽  
Time Factors ◽  
Road Transport ◽  
Transportation System ◽  
Transport Network ◽  
Hazardous Substances ◽  
Public Authorities ◽  
Waste Products ◽  
Minimum Number ◽  
Dangerous Substances

Purpose. To improve existing methods for safe routing when transporting hazardous materials as well as waste products. Methodology. Methods of mathematical modeling, methods of statistics, methods for predicting risks and long-term environmental consequences are used. Taking into account time factors, the distribution of population into different sections of highways is considered. Findings. Parameters of the transport network and their influence on the magnitude of the risk of an emergency situation and possible accidents in the transportation of hazardous waste (THW) are established in the work. An analysis is conducted of dangerous effects that can be caused by THW taking into account the parameters of road, transport network, type and modes of transport, and others. In order to minimize the risk of accidents during THW, it is proposed to use appropriate approaches and criteria K1 and K2, which take into account the lowest values of dangerous effects on the person during the transportation time, which allow evaluating the safety of the transportation system and the selected route, whereas their product takes into account all the possible main factors of the transportation system. Typical road and rail transport schemes have been identified to ensure a minimum number of accidents and reduce environmental and human hazards. Originality. Approaches are improved to transportation of dangerous goods by motorway and railroad, in particular, the parameters of curvature and inclination of the road, availability of settlements and bridges, meteorological conditions and traffic congestions, which improves the efficiency and safety of transportation of dangerous substances and materials. Practical value. The original mathematical models of mapping the route for transporting dangerous substances are offered while the existing ones are improved. The results of the research can be used by transport companies, public authorities in the transportation of hazardous substances and logistics and non-hazardous industries.

Sign in / Sign up

Export Citation Format

Share Document