Scientific Journal of KubSAU

Polythematic online scientific journal
of Kuban State Agrarian University
ISSN 1990-4665
AGRIS logo UlrichsWeb logo DOAJ logo
Search by author's name Search by title
140 kb

MATHEMATICAL MODEL OF PROBABILISTIC ASSESSMENT OF THE ONSET OF TECHNOLOGICAL FAILURE OF A POTATO HARVESTER

abstract 0991405011 issue 99 pp. 189 – 200 30.05.2014 ru 1386
The mathematical model presented in this article is designed to assess the probability of occurrence probability of technological failure potato harvester according to the specific conditions and usage
369 kb

MATHEMATICAL MODEL OF REFERRING AUTOMATED SYSTEM DOCUMENTS TO INFORMATION SPHERES OF USERS RESPONSIBILITY

abstract 0921308057 issue 92 pp. 850 – 859 31.10.2013 ru 1001
In the article, we present the mathematical model of referring documents entering the automated system to the spheres of users responsibility. The possibility of application of mathematical apparatus of final predicates algebra as a basic means of model description is proved
209 kb

MATHEMATICAL MODEL OF SPEED OF THE DRIVING FOR OPTIMUM CONTROL OF DRILLING OF WELLS

abstract 1071503062 issue 107 pp. 916 – 926 31.03.2015 ru 900
Known mathematical models of mechanical speed of a driving are functions of two key parameters of management – axial load of a chisel and speeds of rotation of a chisel. The third parameter – a consumption of boring solution on which cleaning of a well of destroyed breed depends exists only in the A.A. Pogarsky model in an obvious or implicit way. The drilling management of the process of conducting of the well is carried out by regulation only of one parameter – loads of a chisel, thus other parameters are supported by constants according to the project on drilling. However, practice of drilling testifies that function of speed of drilling has extremum and for the speed of rotation of a chisel, and for a solution consumption. In work the regression analysis of experimental data of drilling for receiving mathematical model of mechanical speed of a driving is made as functions of three parameters of management, thus are received the models of speed of drilling depending separately on each of parameters at maintenance of two others constants. Schedules of the approaching functions with points of data of drilling from official reports of drilling foremen are constructed. The technique of adaptive optimum control of process by means of the received model of three variables is described: according to the current data of drilling through the set time interval by means of a method of the smallest squares drilling model coefficients constantly are recalculated - thereby the model is constantly arranged under conditions on a well face. Optimum parameters of management of drilling are determined by the adapted model, they are established on the drilling rig and the face drilling in the optimum mode is made. At breed change coefficients of model are again arranged under bottomhole conditions, optimum parameters of management for this breed, etc. are defined. As the model constantly adapts to a face, as a model it is possible to take a standard polynomial of the second degree and to recalculate its coefficients. It will also allow defining new types of models for management of drilling process
190 kb

MATHEMATICAL MODEL OF THE CORRECTION OF PH SOFTENED WATER IN A LONG CHANNEL OF ELECTRODIALYSIS WITH BIPOLAR MEMBRANE

abstract 1261702002 issue 126 pp. 33 – 49 28.02.2017 ru 849
Theoretically and experimentally, we investigated the process of adjusting the pH of natural water of hydrocarbonate class electrodialyzer with bipolar membranes with channel length of 40 cm. We experimentally measured concentration of components, pH of the solutions in alkaline and acid channels of electrodeposition depending on the current density. The article describes a mathematical model for long channels; to scale the mass transfer characteristics of the process there was applied and verified a method of compartmentalization, which gave the possibility to calculate the dependence of the component along the channel length at different velocities of flow of the solution. Numerical calculations were compared with experimental data on electrodialyser of 10 cm and 40 cm length
621 kb

MATHEMATICAL MODEL OF THE PROBLEM OF ROUTE ORGANIZATION IN LARGE-SCALE TRANSPORT NETWORKS WITH THE APPLICATION OF MULTICRITERIAL OPTIMIZATION METHODS

abstract 1331709092 issue 133 pp. 1220 – 1230 30.11.2017 ru 395
Most of the tasks of planning and organizing transport routes are pointed to solving optimization problems on graphs in multi-criteria statements, for which the only optimal solution is missing. In conditions of multicriteria, it becomes necessary to search for a set of alternatives instead of an optimum. The quality of the admissible solutions is estimated by the vector objective function. The article proposes to investigate the problem using a special class of graphs - prefractal graphs, which allow describing in a natural way the structure of the hierarchy of territorial links, as well as enable to take into account structural dynamics in terms of system growth. A multicriteria mathematical formulation of the problem of covering a prefractal graph by simple intersecting chains is constructed, to which the investigated problem of organizing routes in large-scale transport networks reduces. The main social and economic requirements for the transport system are formulated and included in the model in the form of criteria
436 kb

MATHEMATICAL MODEL OF THE PROCESS OF GRANULATION OF RAW WOOD WITH A HIGH DEGREE OF DAMAGE OF ROT

abstract 1171603020 issue 117 pp. 346 – 357 31.03.2016 ru 546
The article presents the mathematical model for determining the temperature after passing trough nozzles of press-granulator, which allows to take into account heat loss through the exterior surface
415 kb

MATHEMATICAL MODEL OF THE DEVELOPMENT AND ACCUMULATION OF TREE BIOMASS

abstract 0821208015 issue 82 pp. 197 – 214 31.10.2012 ru 1507
The article describes the model of the unsteady growth of biological objects on the example of pine. The features of the growth modeling of biological objects are presented
203 kb

MATHEMATICAL MODEL OF THE DYNAMICS OF HIV INFECTION WITHOUT TREATMENT

abstract 1101506038 issue 110 pp. 562 – 578 30.06.2015 ru 1008
This article discusses the mathematical and numerical modeling of the immune system of the course of HIV infection without treatment. Presently a significant number of scientific papers are devoted to the study of this problem. However, HIV infection is highly volatile and there is no effective drug, in that HIV has the ability to mutate and reproduce itself in the presence of chemical substances that are meant to inhibit or destroy it. The mathematical models used in this paper are conceptual and exploratory in nature. The proposed mathematical model allow us to obtain a complete description of the dynamics of HIV infection, and also an understanding of the progression to AIDS. Thus, the results of the numerical solution of differential equations in this work show that: the disease develops, and at low concentration of the virus, a certain level of stability does not depend on the initial concentration of infestation. In the absence of treatment, for interesting competition between virus and the loss of virus caused by immune response should be strictly greater than the rate of multiplication of the virus in the blood; the reproduction rate of the uninfected cells should be stricly greater than the mortality rate of the uninfected cells
454 kb

MATHEMATICAL MODEL OF THE INERTIAL CONVEYOR WITH THE LINK OF PREACCELERATION OF THE LINEAR INDUCTION ELECTRIC DRIVE

abstract 0971403070 issue 97 pp. 993 – 1006 31.03.2014 ru 1067
The purpose of work is increasing the efficiency of the inertial conveyor by applying the link of preacceleration of the linear induction electric drive (LIED). One of the tasks is creation a mathematical model and its research. LIED design with the link of preliminary dispersal was chosen during the work, its installation coordinated on the inertial conveyor. The mathematical model created and its researches conducted. The results of the researches confirm the increasing of the efficiency of the inertial conveyor
412 kb

MATHEMATICAL MODEL OF THE PLUNGER PUMP WITH A CYLINDRICAL LINEAR INDUCTION MOTOR IN THE DRIVE

abstract 0961402040 issue 96 pp. 575 – 585 28.02.2014 ru 1320
The article deals with a plunger pump with a cylindrical linear induction motor (CLIM) in the drive, patented in the Russian Federation and the mathematical model of the drive, made on the basis of the equations of motion of the plunger and mechanical characteristics of CLIM on differential equations by Park-Gorev
ßíäåêñ.Ìåòðèêà