scholarly journals ECONOMIC – MATHEMATICAL MODEL OF THE OPTIMAL PLACEMENT AND DETERMINATION OF RATIONAL CAPACITIES OF AN ENTERPRISES FOR THE PROCESSING OF MUNICIPAL SOLID WASRE (MSW) AT THE REGIONAL LEVEL

2021 ◽  
pp. 23-27
Author(s):  
I.H. Osmanov
Keyword(s):  
Mathematical Model ◽  
Environmental Safety ◽  
Regional Level ◽  
Optimal Placement ◽  
Household Waste ◽  
Processing Plants ◽  
The Crimea ◽  
Recreation Area

The article considers an economic and mathematical model of optimal placement and determination of rational capacities of enterprises for processing solid household waste (SHW) at the regional level. The economic and mathematical model takes into account: factors that ensure the achievement of economic efficiency; ensuring environmental safety of the environment, the population of cities and towns. Environmental safety of SHW processing plants is of the utmost importance, since Crimea is a resort and recreation area. The role of state bodies in solving these urgent problems for the Crimea is considered.

scholarly journals Study on Optimal Placement and Reasonable Number of Viscoelastic Dampers by Improved Weight Coefficient Method

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ji-ting Qu ◽  
Hong-nan Li
Keyword(s):  
Mathematical Model ◽  
Weight Coefficient ◽  
Optimal Placement ◽  
Optimal Method ◽  
Analogy Method ◽  
Numerical Examples ◽  
Viscoelastic Dampers ◽  
Reasonable Number ◽  
Coefficient Method

A new optimal method is presented by combining the weight coefficient with the theory of force analogy method. Firstly, a new mathematical model of location index is proposed, which deals with the determination of a reasonable number of dampers according to values of the location index. Secondly, the optimal locations of dampers are given. It can be specific from stories to spans. Numerical examples are illustrated to verify the effectiveness and feasibility of the proposed mathematical model and optimal method. At last, several significant conclusions are given based on numerical results.

scholarly journals A Control Based Mathematical Model for the Evaluation of Intervention Lines in COVID-19 Epidemic Spread: The Italian Case Study

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 890
Author(s):  
Paolo Di Giamberardino ◽  
Rita Caldarella ◽  
Daniela Iacoviello
Keyword(s):  
Mathematical Model ◽  
Equilibrium Points ◽  
Italian Case ◽  
Control Actions ◽  
Containment Measures ◽  
Asymptomatic Subjects ◽  
The Impact

This paper addresses the problem of describing the spread of COVID-19 by a mathematical model introducing all the possible control actions as prevention (informative campaign, use of masks, social distancing, vaccination) and medication. The model adopted is similar to SEIQR, with the infected patients split into groups of asymptomatic subjects and isolated ones. This distinction is particularly important in the current pandemic, due to the fundamental the role of asymptomatic subjects in the virus diffusion. The influence of the control actions is considered in analysing the model, from the calculus of the equilibrium points to the determination of the reproduction number. This choice is motivated by the fact that the available organised data have been collected since from the end of February 2020, and almost simultaneously containment measures, increasing in typology and effectiveness, have been applied. The characteristics of COVID-19, not fully understood yet, suggest an asymmetric diffusion among countries and among categories of subjects. Referring to the Italian situation, the containment measures, as applied by the population, have been identified, showing their relation with the government's decisions; this allows the study of possible scenarios, comparing the impact of different possible choices.

scholarly journals Mathematical simulation of catalytic paste flow in a ram extruder

2004 ◽  
Vol 58 (9) ◽  
pp. 387-392
Author(s):  
A.V. Zhensa ◽  
V.V. Kostutchenko ◽  
I.A. Petropavlovskiy ◽  
V.A. Filippin ◽  
E.M. Koltsova
Keyword(s):  
Mathematical Model ◽  
Film Thickness ◽  
Volume Content ◽  
Solid Phase ◽  
Functional Dependencies ◽  
Plastic Strength ◽  
Dispersed Phases ◽  
The Mathematical Model

A mathematical model was developed for the stage of catalyst paste preparation. The mathematical model allows the calculation of solvate film thickness and volume content of the solid phase at any moment of time. Functional dependencies were found, which correlated the solvate film thickness and volume content of the solid phase with the plastic strength and viscosity of catalyst pastes. A range of plastic strength was determined, which ensures the optimum forming properties of the pastes. The mathematical model allowed the determination of the concentrations of the components of the continuous and dispersed phases, which ensured the optimum paste forming rheological properties, which, in turn, influence the end properties of an a-FezOs catalyst. The significant role of the solvate film thickness in the forming properties of pastes was demonstrated.

scholarly journals Mechanisms of Constitutional Control: A Preliminary Observation of the Ethiopian System

Afrika Focus ◽  
2007 ◽  
Vol 20 (1-2) ◽  
pp. 75-104 ◽  
Author(s):  
Getahun Kassa
Keyword(s):  
Preliminary Observation ◽  
Regional Level ◽  
Actual Practice ◽  
Constitutional Interpretation ◽  
Federal Level ◽  
State Institutions ◽  
Regional State ◽  
Constitutional Adjudication

Mechanisms of Constitutional Control: A preliminary observation of the Ethiopian system The present mechanism of constitutional adjudication in Ethiopia demonstrates unique features. The mechanism does not belong to any of the constitutional adjudication models operating in other countries. However, a well-developed system of constitutional adjudication is lacking in actual practice. The federal and regional state organs that exercise the power of constitutional control, i.e. the Council of Constitutional Inquiry and the House of Federation at the federal level and the Constitutional Interpretation Commissions, Council of Nationalities and Councils of Constitutional Inquiry at the regional level, are not functioning fully and, moreover, are not moving at equal pace. In some regional states, the institutions competent for constitutional control, though mentioned in the regional constitutions, are not even established yet. In other regions, these institutions have been established, but are not operating in practice. Besides, a challenge of judicial overlap is likely to emerge when the regional organs start to execute their task of constitutional control. Since no mechanism is devised to delimit the respective competences of the federal and state organs, overlap between federal and state institutions is inevitable. Furthermore, there is no clear guidance with regards to the role of the judiciary on matters that involve determination of constitutionality.

scholarly journals Energy Efficiency of a Biofuel Production System

2017 ◽  
Vol 8 (1) ◽  
pp. 60-68 ◽  
Author(s):  
Andrzej Wasiak ◽  
Olga Orynycz
Keyword(s):  
Mathematical Model ◽  
Energy Efficiency ◽  
Production System ◽  
Biofuel Production ◽  
Agricultural Crops ◽  
Production Processes ◽  
Energy Plantations ◽  
The Mathematical Model

Abstract Manufacturing engineering is supposed to provide analyses related to various aspects of manufacturing and production in order to maximise technological, energy, and economic gains in relevant production processes. The present paper gives a recapitulation of several publications by present authors, presenting considerations of the energy efficiency of biofuel production. The energy efficiency is understood as the ratio of energy obtained from biofuels produced basing on crops from a particular area to the energy required to satisfy needs of all subsidiary processes assuring correct functioning of the production system, starting from operations aimed to obtain agricultural crops, and ending with the conversion of the crops onto biofuels. Derived by the present authors, the mathematical model of energy efficiency of biofuel production is extended to a more general form, and applied to the analysis of quantitative relations between energy efficiency of sc. “energy plantations”, and further elements of biofuel production system converting harvested biomass into biofuel. Investigations are aimed towards the determination of the role of biomass as a source of energy.

scholarly journals Mechanisms of Constitutional Control: A preliminary observation of the Ethiopian system

Afrika Focus ◽  
2007 ◽  
Vol 20 (1-2) ◽  
Author(s):  
Getahun Kassa
Keyword(s):  
Preliminary Observation ◽  
Regional Level ◽  
Actual Practice ◽  
Constitutional Interpretation ◽  
Federal Level ◽  
State Institutions ◽  
Federal Constitution ◽  
Constitutional Adjudication

The present mechanism of constitutional adjudication in Ethiopia demonstrates unique features. The mechanism does not belong to any of the constitutional adjudication models operating in other countries. However, a well-developed system of constitutional adjudication is lacking in actual practice. The federal and regional state organs that exercise the power of constitutional control, i.e. the Council of Constitutional Inquiry and the House of Federation at the federal level and the Constitutional Interpretation Commissions, Council of Nationalities and Councils of Constitutional Inquiry at the regional level, are not functioning fully and, moreover, are not moving at equal pace. In some regional states, the institutions competent for constitutional control, though mentioned in the regional constitutions, are not even established yet. In other regions, these institutions have been established, but are not operating in practice. Besides, a challenge of judicial overlap is likely to emerge when the regional organs start to execute their task of constitutional control. Since no mechanism is devised to delimit the respective competences of thefederal and state organs, overlap between federal and state institutions is inevitable. Furthermore, there is no clear guidance with regards to the role of the judiciary on matters that involve determination of constitutionality.Key Words: Constitutional Control, Federal Constitution, Regional Constitutions, Cases, Traditional and Religious Rules and Institutions 

A Molecular Approach to Immunoscintigraphy: A Study of the T-Antigen Conformation on the Surface of Tumors

1987 ◽  
Vol 26 (01) ◽  
pp. 1-6 ◽  
Author(s):  
S. Selvaraj ◽  
M. R. Suresh ◽  
G. McLean ◽  
D. Willans ◽  
C. Turner ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Tumor Cell ◽  
T Antigen ◽  
Human Carcinomas ◽  
Animal Tumor ◽  
Synthetic Antigens

The role of glycoconjugates in tumor cell differentiation has been well documented. We have examined the expression of the two anomers of the Thomsen-Friedenreich antigen on the surface of human, canine and murine tumor cell membranes both in vitro and in vivo. This has been accomplished through the synthesis of the disaccharide terminal residues in both a and ß configuration. Both entities were used to generate murine monoclonal antibodies which recognized the carbohydrate determinants. The determination of fine specificities of these antibodies was effected by means of cellular uptake, immunohistopathology and immunoscintigraphy. Examination of pathological specimens of human and canine tumor tissue indicated that the expressed antigen was in the β configuration. More than 89% of all human carcinomas tested expressed the antigen in the above anomeric form. The combination of synthetic antigens and monoclonal antibodies raised specifically against them provide us with invaluable tools for the study of tumor marker expression in humans and their respective animal tumor models.

On The Mechanism Of Heparin-Induced Potentiation Of Platelet Aggregation

1981 ◽  
Author(s):  
M Yamamoto ◽  
K Watanabe ◽  
Y Ando ◽  
H Iri ◽  
N Fujiyama ◽  
...  
Keyword(s):  
Platelet Aggregation ◽  
Platelet Activation ◽  
Coagulation Factors ◽  
Marked Enhancement ◽  
Matrix Bound ◽  
Induced Aggregation ◽  
Aggregation Of Platelets ◽  
Plasma Heparin

It has been suggested that heparin caused potentiation of aggregation induced by ADP or epinephrine. The exact mechanism of heparin-induced platelet activation, however, remained unknown. In this paper, we have investigated the role of anti-thrombin III ( AT ) in heparin-induced platelet activation using purified AT and AT depleted plasma. When ADP or epinephrine was added to citrated PRP one minute after addition of heparin ( 1 u/ml, porcine intestinal mucosal heparin, Sigma Co. USA ), marked enhancement of platelet aggregation was observed, compared with the degree of aggregation in the absence of heparin. However, in platelet suspensions prepared in modified Tyrode’s solution, heparin exhibited no potentiating effect on platelet aggregation induced by epinephrine or ADP. Potentiation of epinephrine- or ADP-induced platelet aggregation by heparin was demonstrated when purified AT was added to platelet suspensions at a concentration of 20 μg/ml. AT depleted plasma, which was prepared by immunosorption using matrix-bound antibodies to AT, retained no AT, while determination of α1-antitrypsinα2- macroglobulin and fibrinogen in AT depleted plasma produced values which corresponded to those of the original plasma when dilution factor was taken into account. The activities of coagulation factors were also comparable to those of the original plasma. Heparin exhibited potentiating effect on ADP- or epinephrine-induced aggregation of platelets in original plasma, but no effect in AT depleted plasma. When purified AT was added back to AT depleted plasma at a concentration of 20 μg/ml, potentiation of platelet aggregation by heparin was clearly demonstrated.Our results suggest that effect of heparin on platelet aggregation is also mediated by anti-thrombin III.

The Impact of Light Polarisation on Light Field of Scenes with Multiple Reflections

2020 ◽  
pp. 108-115 ◽  
Author(s):  
Vladimir P. Budak ◽  
Anton V. Grimaylo
Keyword(s):  
Mathematical Model ◽  
Light Field ◽  
Global Illumination ◽  
Multiple Reflections ◽  
Software Environment ◽  
The Monte Carlo Method ◽  
Mueller Matrices ◽  
Volume Integration ◽  
The Impact

The article describes the role of polarisation in calculation of multiple reflections. A mathematical model of multiple reflections based on the Stokes vector for beam description and Mueller matrices for description of surface properties is presented. On the basis of this model, the global illumination equation is generalised for the polarisation case and is resolved into volume integration. This allows us to obtain an expression for the Monte Carlo method local estimates and to use them for evaluation of light distribution in the scene with consideration of polarisation. The obtained mathematical model was implemented in the software environment using the example of a scene with its surfaces having both diffuse and regular components of reflection. The results presented in the article show that the calculation difference may reach 30 % when polarisation is taken into consideration as compared to standard modelling.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

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