scholarly journals THE STUDY OF PROFITABILITY OF DWELLING RECONSTRUCTION OF FIRST MASS SERIES

2019 ◽  
Vol 2 (53) ◽  
pp. 143-150
Author(s):  
Tatiana Dubelt
Keyword(s):  
Numerical Experiment ◽  
Mathematical Models ◽  
Graphical Models ◽  
Technological Factors ◽  
Simultaneous Impact ◽  
The Given

The study of organizational and technological factors on dwelling reconstruction profitability of first mass series with thepurpose to define the effective organizational solutions of reconstruction is described. The study is carried out on the basis ofexample of dwelling reconstruction of typical series 1-4382.5-7. The informative and graphical models of reconstruction aremade. The factors having impact on reconstruction indexes are defined. The plan of numerical experiment considering simultaneous impact of the given factors on the profitability index of reconstruction is made. With the help of experimental andstatistical modeling mathematical models of dependency of profitability on the factors in the form of charts are made.The charts analysis defined the areas of effective solutions by simultaneous impact of factors. By the results of studies theconclusions about the conditions of such dwellings reconstruction operations are made.

scholarly journals THE STUDY OF IMPACT OF FACTORS ON PROFITABILITY INDEX OF RECONSTRUCTION OF THE DWELLINGS

2020 ◽  
Vol 1 (154) ◽  
pp. 178-184
Author(s):  
T. Dubelt
Keyword(s):  
Graphical Models ◽  
Mathematical Analysis ◽  
Efficient Solutions ◽  
Graphical Modeling ◽  
Mathematical Formula ◽  
Technological Factors ◽  
Simultaneous Impact ◽  
Lack Of Information ◽  
The Impact ◽  
The Given

The article deals with the study of impact of organizational and technological factors on the index of recon-struction profitability of dwellings of first mass series on condition of habitants’ eviction while doing operations. We find lack of information on the methodology of the study of such objects in informative sources . Factual dwellings’ reconstruction has an incidental character and does not allow to define the impact of factors on the indexes of reconstruction because it takes place by fixed values of factors and limited quantities of objects. And as a consequence we find investors’ unwillingness to put money into the reconstruction of the dwellings of typical series. The purpose of the study is to define the efficient solutions of reconstruction of the dwelling of typical series 1-4382.5-7. The given task is solved by making abstract models of the series imitating reconstruction’s operations by simultaneous impact of organizational and technological factors. While conducting the investigation we defined the factors and the levels of their variation that have impact on the dwellings’ reconstruction. The plan of multiple experiment was elaborated considering the simultaneous effect of the given factors on reconstruction indexes. On the basis of the given series of dwelling we made informative and graphical models, and we also got the indexes of reconstruction. Graphical modeling allowed to obtain numerical values of operations’ durability. Simultaneous impact of factors and the conditions of habitants’ eviction defined numerical value of operations’ cost. With the help of formula we obtained the value of profitability index. We defined the dependency of profitability index on varying factors using the methods of mathematical analysis. It is shown in the form of dependency charts and is described by mathematical formula. We substantiated the admissible numerical values of profitability index of reconstruction of the dwellings of first mass series. The conclusions about effective solutions on reconstruction of such dwellings are made by graphical image and the areas of effective solutions are defined Keywords: factors, reconstruction indexes, reconstruction models, mathematical analysis, charts of dependency.

Investigation of the Influence of Technological Factors on the Characteristics of Flexible Non-Adhesive Foil Dielectrics

2020 ◽  
Vol 25 (6) ◽  
pp. 505-516
Author(s):  
A.V. Vorobyov ◽  
◽  
V.D. Zhora ◽  
N.I. Plis ◽  
S.P. Timoshenkov ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Electrical Characteristics ◽  
Traditional Use ◽  
Total Thermal Resistance ◽  
Technological Factors ◽  
High Adhesion ◽  
Negative Effect ◽  
The Stability ◽  
Thermal Resistors ◽  
The Given

Currently, the traditional use of varnish-foil dielectrics for manufacturing resistors, resistive assemblies and heating elements has been supplemented by their application in production of thermal resistors, the membranes of acoustic and photoelectric transformers. As a rule, the non-adhesive foil dielectrics sustain the affect of high temperatures, permit to significantly increase the density of elements and have better quality characteristics, because the adhesives have negative effect upon the electrical characteristics of the materials, manufactured with their application. Also, the adhesives have comparatively low thermal resistance, which manifests on the total thermal resistance of foil dielectric and the items manufactured on it, especially in case when as a base polyimide is used. In the paper the flexible foil dielectrics for electronic equipment and their manufacturing technology have been considered. The advantages of the non-adhesive foil dielectrics with complete imidization of the polymer base have been shown. The technology of manufacturing the varnish-foil dielectrics, used in manufacturing highly reliable microcircuits of modification 2 and of highly technological membranes of acoustic transformers, has been developed. The polyimide base of the dielectrics has high adhesion to foil and the guaranteed uniformity of the imidization extent 95-100 %. This provides the stability of technological conditions in the process of manufacturing the items from the given materials, as well as an increase of the storage life of the varnish-foil dielectrics up to 12 months.

scholarly journals Kesulitan Siswa Dalam Menyelesaikan Masalah Matematika Berdasarkan Langkah Polya

2020 ◽  
Vol 5 (12) ◽  
pp. 1820
Author(s):  
Amanda Putri Enlisia ◽  
Swasono Rahardjo ◽  
Sisworo Sisworo
Keyword(s):  
Mathematical Model ◽  
Problem Solving ◽  
Data Collection ◽  
Mathematical Models ◽  
Qualitative Data ◽  
Look Back ◽  
The Given ◽  
Looking Back ◽  
Qualitative Data Collection ◽  
Descriptive Qualitative

<p><strong>Abstract:</strong> The purpose of this study is to describe students' difficulties in mathematicals problem solving based on Polya's. The subjects in this study were 2 students of class VII. This type of research is descriptive qualitative. Data collection techniques through problem solving tests and interviews. The results of this study are (1) steps to understanding the problem that students have difficulty in understanding the sentences or terms contained in the problem, and students also have difficulty in finding keywords in the problem; (2) steps to devising the plan that students cannot make a mathematical model; (3) steps to carry out planning are students don’t understand the given problem and aren’t yet right in making mathematical models; (4) the step of looking back is that students don’t understand how to look back correctly and students are still lazy in checking the correctness of the answers.</p><strong>Abstrak:</strong> Tujuan penelitian ini adalah untuk mendeskripsikan kesulitan siswa dalam memecahkan masalah matematika berdasarkan langkah Polya. Subjek dalam penelitian ini adalah siswa kelas VII. Jenis penelitian yang digunakan adalah kualitatif deskriptif. Teknik pengumpulan data melalui tes pemecahan masalah dan wawancara. Hasil dari penelitian ini adalah (1) langkah memahami masalah yaitu siswa kesulitan dalam memahami kalimat atau istilah-istilah yang terdapat pada soal, dan siswa juga kesulitan dalam menemukan kata kunci pada soal; (2) langkah merencanakan masalah yaitu siswa belum dapat membuat model matematika; (3) langkah melaksanakan perencanaan adalah siswa kurang paham dengan masalah yang diberikan dan belum tepat dalam membuat model matematika; (4) langkah melihat kembali adalah siswa belum paham bagaimana cara melihat kembali dengan benar dan siswa masih malas dalam mengecek kebenaran jawaban.

scholarly journals About some approaches modeling of the vehicle on simulator

2019 ◽  
pp. 29-35
Author(s):  
V. G. Mikhailov
Keyword(s):  
Mathematical Models ◽  
Check Point ◽  
Matlab Simulink ◽  
Average Speed ◽  
Bench Tests ◽  
Combined Use ◽  
Moving Platform ◽  
Information Interchange ◽  
The Given ◽  
Perfect Models

The purpose of the given work is consideration and working off of approaches, techniques, schemes of realisation of modelling of the vehicle on simulators on the basis of a choice of more perfect models of movement, fluctuations, roadability of the vehicle in package Matlab/Simulink for reception and an estimation of parametres of the vehicle, it loading. Features of imitating modelling of the vehicle on a simulator, requirements to it, using methods of such modelling on the basis of computer models, hydropulsators and a moving platform with the monitors/projectors, simulating road conditions where reactions to it of the driver, movements essentially influencing modes and loading the vehicle with the further use of the received data at bench tests are considered are considered. Mathematical models of the tyre, movement, fluctuations, the roadabilities of the vehicle providing more correct modelling in real time are developed.New approaches and technique in realisation of imitating modelling of movement, roadability and loading the vehicle, based on combined use of the powerful computer and minicomputer Raspberry for reading of parametres of controls, steering of visualisation of road conditions, module S-Function Builder created ON on С/C++ both an incorporated file longinal profile and a microprofile of real road, the information interchange organisation through three general files on SD disk Raspberry with certain periodicity (5 Hz) are offered, the block diagramme in Matlab/Simulink and is developed software. By the spent modelling of the vehicle 6х6 with ma = 21200 kg it is established that it has fuel consumption of km of 63,56 l/100, average speed of 66,1 km/h and number of switchings of a check point 7 (at t> 10 c). And basically check point switching occurs on last 3 higher drives.

scholarly journals MATHEMATICAL MODELLING OF STRENGTH CHARACTERISTICS OF ELECTROCONSOLIDATED ZrO2-Al2O3 MATERIALS

2014 ◽  
Author(s):  
Edwin Spartakovych Gevorkyan ◽  
Grigoriy Petasyuk ◽  
Olga Melnik
Keyword(s):  
Fracture Toughness ◽  
Mathematical Modelling ◽  
Mathematical Models ◽  
Quality Indicators ◽  
Holding Time ◽  
Strength Characteristics ◽  
Technological Factors ◽  
Synthesis Of Materials ◽  
The Way

In this article the way of forecasting of quality indicators (fracture toughness, hardness) ofelectroconsolidated materials of ZrO2 - Al2O3 nanosystem is considered by a method of mathematicalmodeling.The main patterns of influence of technological factors eleсtroсonsolidation and concentration ofinitial components for the synthesis of materials using zirconia and alumina nanopowders on the strengthcharacteristics of the materials were identified. The mathematical models were built. The model is easy toassess the extent and impact of the results of each of the factors (temperature, holding time and Al2O3concentration) on the characteristics of the object, find it optimal regimes operation. The active experimentallows putting the artificial indignation on object under study and measuring the corresponding valuesoutput parameters. The size and mix of revolting influences introduced into the facility in accordance with adefinite plan, for any optimal criteria.

scholarly journals A Math Approach with Brief Cases towards Reducing Computational and Time Complexity in the Industrial Systems

2020 ◽  
Author(s):  
Yaroslav Matviychuk ◽  
Tomáš Peráček ◽  
Natalya Shakhovska
Keyword(s):  
Mathematical Models ◽  
Time Complexity ◽  
Order Reduction ◽  
Parametric Identification ◽  
Problem Area ◽  
Model Order ◽  
Industrial Systems ◽  
The Neural Network ◽  
Reduction Methods ◽  
The Given

The paper proposes a new principle of finding and removing elements of mathematical model, redundant in terms of parametric identification of the model. It allows reducing computational and time complexity of the applications built on the model. Especially this is important for AI based systems, systems based on IoT solutions, distributed systems etc. Besides, the complexity reduction allows increasing an accuracy of mathematical models implemented. Despite the model order reduction methods are well known, they are extremely depended however on the problem area. Thus, proposed reduction principles can be used in different areas, what is demonstrated in this paper. The proposed method for the reduction of mathematical models of dynamic systems allows also the assessment of the requirements for the parameters of the simulator elements to ensure the specified accuracy of dynamic similarity. Efficiency of the principle is shown on the ordinary differential equations and on the neural network model. The given examples demonstrate efficient normalizing properties of the reduction principle for the mathematical models in the form of neural networks.

Application of dissolved air flotation for treatment of wastewater from meat processing industry

1995 ◽  
Vol 31 (3-4) ◽  
pp. 341-344 ◽  
Author(s):  
J. Wasowski
Keyword(s):  
Rational Design ◽  
Meat Processing ◽  
Waste Waters ◽  
Processing Industry ◽  
Dissolved Air Flotation ◽  
Technological Factors ◽  
Air Flotation ◽  
The Given ◽  
Dissolved Air

The paper concerns the application of dissolved air flotation for treatment of waste water from the meat processing industry. The main aim of the study was identification of the flotation mechanism aided by the coagulation in the layouts with and without recycling, and finding and defining the role of the technological factors influencing flotability of pollutants found in the given waste waters. The results of the studies, supported by the mathematical analysis, form the basis of rational design and conduction of flotation in practice.

scholarly journals Method and equipment for the safe development of preparatory workings in the gas-bearing coal seams

2019 ◽  
Vol 109 ◽  
pp. 00102
Author(s):  
Mykola Trokhymets ◽  
Vira Maltseva ◽  
Yehor Vialushkin ◽  
Volodymyr Antonchik ◽  
Tetiana Moskalova ◽  
...  
Keyword(s):  
Coal Seam ◽  
Mathematical Models ◽  
Mining Operations ◽  
Liquid Injection ◽  
Mathematical Formulas ◽  
Outburst Coal Seam ◽  
The Cost ◽  
The Given ◽  
Gas Bearing

The article describes a method and equipment for the safe development of preparatory working on a gas-bearing, outburst hazardous coal seam by a heading machine. The described method significantly prevents the gas emission during mining operations. Determination of the amount of degassing and relief wells is performed according to the given in article mathematical formulas. This ensures a significant increase in the level of safety processing the preparatory roadway on a gas-bearing, prone to outbursts coal seam by a heading machine. Due to this, the speed of conducting excavation increases and the cost of mining is reduced. The proportionality coefficients of the mathematical models were determined. Mathematical models are used to calculate the number of relief and degassing wells, which are drilled during the impulse hydraulic loosing of the nearby part of the coal seam. Also the duration of liquid injection into a coal seam is also determined. Mathematical models for calculating the number of injection, unloading and degassing boreholes can be used in development of the passports for conducting preparatory workings on a gas-bearing, prone to outburst coal seam by a heading machine with a preliminary impulse hydraulic loosing of the nearby part of a coal seam.

Identification of biological models described by systems of nonlinear differential equations

2015 ◽  
Vol 23 (5) ◽  
Author(s):  
Sergey I. Kabanikhin ◽  
Olga I. Krivorotko
Keyword(s):  
Infectious Disease ◽  
Mathematical Model ◽  
Inverse Problems ◽  
Numerical Experiment ◽  
Mathematical Models ◽  
Tumor Cells ◽  
Nonlinear Differential Equations ◽  
Optimization Approach ◽  
Biological Models ◽  
Gradient Type

AbstractFour simple mathematical models of pharmacokinetic, competition between immune and tumor cells, infectious disease and tuberculosis epidemic are considered. An optimization approach for identification those models based on gradient type methods is introduced. Inverse problems are formulated in the form of an operator equation and then reduced to the minimization of the corresponding misfit functionals. The adjoint problems are used for the calculation of gradients. A mathematical model of competition between immune and tumor cells is considered numerically. The results of a numerical experiment are demonstrated.

Computerised Tooth Profile Generation of Conjugated Involute Internal Gears

2013 ◽  
Vol 572 ◽  
pp. 355-358 ◽  
Author(s):  
Cuneyt Fetvaci
Keyword(s):  
Computer Program ◽  
Mathematical Models ◽  
Tooth Profile ◽  
Tooth Surface ◽  
Gear Pumps ◽  
Tooth Surfaces ◽  
Internal Gear ◽  
The Given ◽  
Gear Profile

This paper studies the conjugated involute profile which are used in internal gear pumps. In this type of gear mechanisms, the internal gear profile is completely conjugate of the external gear profile. A composite line of action curve is obtained because the root fillets also play role in engagement cycle. The perfomance of the mechanism is increased. By applying consequent transformations, firstly the tooth surface of the generated external gear is obtained and secondly the tooth surface of the conjugated involute internal tooth surface is obtained. Also asymmetric tooth is considered. Mathematical models of generating and generated tooth surfaces are given. Based on the given mathematical models, a computer program is developed to obtain generating and generated surface. Conventional and conjugated involute profiles are compared.

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