scholarly journals ANALYSIS AND PARAMETRIC OPTIMIZATION OF ENERGY-AND-TECHNOLOGY UNITS ON THE BASIS OF THE POWER EQUIPMENT OF COMPRESSOR PLANTS OF MAIN GAS PIPELINES

2017 ◽  
Vol 60 (6) ◽  
pp. 571-583
Author(s):  
V. A. Sednin ◽  
A. A. Abrazovskii
Keyword(s):  
Parametric Optimization ◽  
Methodological Approach ◽  
Feasibility Studies ◽  
Optimization Criterion ◽  
Mathematical Tool ◽  
Control Parameters ◽  
Fuel Gas ◽  
Optimization Criteria ◽  
Equal Variance ◽  
The Matrix

On the basis of the gas compressor units of compressor plants of a main gas pipeline mathematical models of the macro-level were generated for analysis and parametric optimization of combined energy-and-technology units. In continuation of the study these models was applied to obtain the regression dependencies. For this purpose, a numerical experiment was used which had been designed with the use of regression analysis mathematical tool, which assumes that the test results should represent independent, normally distributed, random variables with approximately equal variance. Herewith we study the dependence of the optimization criterion on the value of control parameters (factors). Planning, conducting and processing of results of the experiment was conducted in the following sequence: choice of the optimization criteria, selection of control parameters (factors), encoding factors, the matrix of experiment compiling, assessing significance of regression coefficients, testing the adequacy of the model and reproducibility of the experiments. As the optimization criteria the electricity capacity and efficiency of combined energy-technology units were adopted. As control parameters for the installation with a gas-expansion-and-generator machine the temperature of the fuel gas before the expander, the pressure of the fuel gas after the expander and the temperature of the air supplied to the compressor of the engine were adopted, while for the steam turbine the adopted optimization criteria were compression in the compressor of the engine, the steam consumption for the technology and the temperature of the air supplied to the compressor of the engine. The application of the outlined methodological approach makes it possible to obtain a simple polynomial dependence, which significantly simplify the procedures of analysis, parametric optimization and evaluation of efficiency in the feasibility studies of the options of construction of the energy facilities.

scholarly journals On Solutions of the Matrix Equation A ∘ l X  = B with respect to M M -2 Semitensor Product

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Jin Wang
Keyword(s):  
Matrix Equation ◽  
Matrix Multiplication ◽  
Sufficient Condition ◽  
Mathematical Tool ◽  
Necessary And Sufficient Condition ◽  
The Matrix ◽  
Necessary And Sufficient

M M -2 semitensor product is a new and very useful mathematical tool, which breaks the limitation of traditional matrix multiplication on the dimension of matrices and has a wide application prospect. This article aims to investigate the solutions of the matrix equation A ° l X = B with respect to M M -2 semitensor product. The case where the solutions of the equation are vectors is discussed first. Compatible conditions of matrices and the necessary and sufficient condition for the solvability is studied successively. Furthermore, concrete methods of solving the equation are provided. Then, the case where the solutions of the equation are matrices is studied in a similar way. Finally, several examples are given to illustrate the efficiency of the results.

MODEL OF ASSORTMENT OPTIMIZATION AND INVENTORY MANAGEMENT IN ENTERPRISE

2021 ◽  
Vol 9 (1) ◽  
pp. 31-46
Author(s):  
Ibrokhim Xabibullayev ◽  
◽  
Ruslana Zhovnovach ◽  
Mariia Petrova ◽  
◽  
...  
Keyword(s):  
Inventory Management ◽  
Coefficient Of Variation ◽  
Methodological Approach ◽  
Integrated Approach ◽  
Optimization Criterion ◽  
Commercial Activity ◽  
Commercial Activities ◽  
Individual Product ◽  
Assortment Optimization

The actual problems of work in the sphere of organization of supply and sale are considered, the existing developments in the sphere of modeling and optimization of commercial activity of the wholesale trading enterprises are analyzed. The necessity of a comprehensive approach to improving the commercial activities of wholesalers is substantiated. The composition of the solutions included in the integrated approach is determined by the sole purpose, practical possibilities of its implementation and implementation at the wholesale enterprises and is based on the analysis of actual problems of the industry as a whole, interdependence in the work of departments, development of a single optimization criterion. The effectiveness of the integrated approach is based on the fact that for the sake of maximum result it is important not to isolate the development of individual operations, but to improve the entire purchasing system of the wholesale enterprise as a whole. The scientific and methodological approach of carrying out the integrated ABC-XYZ analysis of a range of a trading enterprise by its combination with R/S analysis, which acts as a criterion for the effectiveness of the XYZ analysis and an indicator of the possibility of forecasting the dynamics of sales of individual product groups, has been improved. XYZ analysis, based on the calculation of the coefficient of variation, when there are deterministic factors such as seasonality, cyclicality or trend in a series of determinants, shows erroneous results. Therefore, it is suggested to use R/S analysis to evaluate the quality of the XYZ analysis and to pre-process the data. This will allow us to draw more adequate conclusions about the possibility of forecasting the dynamics of sales of certain product groups in the future.

scholarly journals Making Cycling Spaces in Hilly Cities

2020 ◽  
Author(s):  
Isabel Matias ◽  
Bertha Santos ◽  
Ana Virtudes
Keyword(s):  
Environmental Pollution ◽  
Traffic Congestion ◽  
Road Network ◽  
Methodological Approach ◽  
Feasibility Studies ◽  
It Use ◽  
Doctoral Research ◽  
Definition Of ◽  
Serra Da Estrela

Traffic congestion and environmental pollution in cities have stimulated the rise of policies to encourage practices of less polluting, and more economic and healthier modes of transportation, such as cycling. Several factors influence bicycle use, including the steep gradients which can limit it use, but do not completely prevent it. In this context, urban planning and transport engineering play a key role in promoting cycling, with particular emphasis on the definition and design of cycling networks at hilly cities, according to the citizens’ needs on their daily commutes. To address this challenge, this paper describes the starting developments and the methodological approach of a doctoral research having the following goals: to define the data to be considered in feasibility studies of designing cycling mode in hilly cities; to develop a bicycle suitability model based on demographic, travel-generating poles, type of bicycles (regular vs. electric) and road network criteria; to develop a model to support the definition of cycling network based on connectivity, network intersections, integration with other modes of transportation, parking and safety; and to define a procedure for assessing solutions and define cycling routes hierarchy, having as case study the hilly city of Covilhã, at Serra da Estrela mountain.

scholarly journals Methodological approaches to determining the integrated state and margin of economic security with regard to its provision

2020 ◽  
pp. 59-69
Author(s):  
Ievgeniia Mishchuk
Keyword(s):  
Methodological Approach ◽  
Integrated Approach ◽  
Economic Security ◽  
Primary Sources ◽  
Security Assessment ◽  
Matrix Approach ◽  
Control Factors ◽  
Analysis And Synthesis ◽  
The Matrix ◽  
Methodological Approaches

Purpose of the research. The article aims to develop methodological approaches to determining the integrated state and margin of economic security with regard to its provision. Methodology. The following general scientific theoretical methods are used in the study: generalization, explanation, grouping – to analyse economists’ and practitioners’ views on the object under study and draw conclusions upon analysis of primary sources; analysis and synthesis – to justify a new differentiated-integrated approach to economic security assessment; the matrix approach – to integrate the level of economic security and its temporal state and determine the margin of economic security. Results. The article presents methodological approaches developed to determine the integrated state of economic security of an enterprise. It is proposed to understand the integrated state of economic security as its value at a specific date of assessment determined considering the achieved level and temporal state of economic security at a given moment. The article presents a matrix approach to determining the current economic security and proposes an additional indicator of expediency of security provision measures based on the time criterion. The proposed methodological approach to determining the margin of economic security of the enterprise with regard to its provision is based on qualitative and quantitative approaches to its assessment. The approach involves comparison of the value of the level of economic security provision with the integrated state of security resulted from corresponding measures. Practical meaning. The use of the indicator of the margin of economic security with regard to its provision in practical activities of enterprises enables their management to consider beyond-control factors and on this basis make decisions on strengthening (acceleration) or, on the contrary, weakening and economy of implemented measures and programmes aimed to enhance economic security. Prospects for further research. Further research by the author is devoted to development of a methodology for determining the integrated state of medium-term and strategic economic security and, accordingly, identifying the margin of economic security that may occur when these types of economic security are provided.

scholarly journals Methodological bases of estimating the efficiency of economic security management of the enterprises in the global environment

2018 ◽  
Vol 15 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Iryna D'yakonova ◽  
Alina Nikitina ◽  
Victor Sukhonos ◽  
Fedir Zhuravka
Keyword(s):  
Methodological Approach ◽  
Security Management ◽  
Economic Security ◽  
Global Environment ◽  
Strategic Direction ◽  
The Matrix ◽  
Internal Balance ◽  
Functional Components ◽  
Enterprise Activity ◽  
Total Impact

The article analyzes concepts to determining the essence of the economic security management at an enterprise. The main features of identifying the effectiveness of economic security management at the enterprise are stipulated. The theoretical and methodological approach to determining the effectiveness of economic security management of the enterprise is proposed, which allows to identify the threats and predict their consequences, to provide internal balance in the enterprise activity and the compliance of its mission and strategic direction of the activity with its key interests. Moreover, it is proposed to use the matrix of comparing the level of the enterprise economic security (EES) and the total impact on the EES level in one of the scenarios (pessimistic, optimistic, and most probable), which allows to assess the effectiveness of the economic security management of the enterprises and provide recommendations to increase the latter, minimizing destructive effects of dominant threats in the context of certain functional components of the economic security.

Results From the Research on Microturbine-CHP-Applications in Flanders

2005 ◽  
Author(s):  
Johan Liekens ◽  
Johan Van Bael ◽  
Johan Desmedt ◽  
Nico Robeyn ◽  
Peter Jannis
Keyword(s):  
Energy Saving ◽  
Turbine Blade ◽  
Financial Support ◽  
Energy Savings ◽  
Feasibility Studies ◽  
Primary Energy ◽  
Theoretical Research ◽  
Fuel Gas ◽  
Market Opportunities ◽  
Economical Feasibility

Since 2002, Vito is exploring the market opportunities for microturbine-CHP in Flanders. In the theoretical research, the effect of the efficiencies of microturbine-CHP on the economical feasibility of the project was investigated. In Flanders, cogeneration can obtain financial support proportional to the primary energy saving. The significant impact of this support will be shown from the results of three feasibility studies on microturbine-CHP. This paper also explains that microturbine based cooling does not realize primary energy savings and therefore will hardly be financially attractive in Flanders. In our Thermotechnical laboratory, we have performed tests on the C30 LF/DG-microturbine-CHP. These tests were done with different fuel gas compositions. The turbine performed very good, but emissions increased with lower methane content of the fuel. At the end, one turbine blade seemed to be broken. Nevertheless, the performance or vibrations of the turbine were not affected.

Achieving the spatial development goals using the human-driven approach

2019 ◽  
Vol 5 (3) ◽  
pp. 160-178
Author(s):  
Elena V. Kurushina
Keyword(s):  
Human Capital ◽  
Development Strategy ◽  
Methodological Approach ◽  
Federal District ◽  
Spatial Development ◽  
Matrix Analysis ◽  
Development Factor ◽  
The Matrix ◽  
Development Goals ◽  
Structural Indicators

Efficient implementation of the Spatial Development Strategy is necessary to solve the accumulated problems, and this requires defining a new methodological approach. Relying on the review of modern anthropocentric development theories, the author suggests the types of management models in terms of several elements. They include the goal setting with the focus on the human development, the goal adjustment among the stakeholders, the application of human capital characteristics as the key development factor, and the formation of management mechanisms based on the differential approach. This study explains the decision making to achieve strategic goals of the spatial development with the methodical complex within the human-oriented (human-driven) approach, comprising the method of assessing the human-oriented development, regression models of the human capital growth due to migration and reproduction processes, and the method of the regional typologization in terms of objective and subjective characteristics of the territory attractiveness for population. The method tested in this work focuses on achieving one of the most important goals of the spatial development of the 1st level on the example of the subjects of the Ural Federal District (UFD). During the test, this method allowed assessing not only the level of the human-oriented development, but also the degree of its balance in terms of the standard deviation of the structural indicators of the development components, including the economic, socio-natural and inclusive components. The results obtained allowed defining the positions of regions in the matrix “human-oriented development level — balance of components”. Combination of the matrix analysis of subjects of the UFD with the results of the typologization of these regions showed the dependence of the degree of the migrants’ reaction on the changes in the quality of life and the human-oriented development. The performed study provides the evidence towards the need to increase the level and improve the balance of components of the human-oriented development of regions from the viewpoint of the management efficiency of the human capital accommodation. This is essential for creating new centres of economic growth and ensuring the demographic security of Russia.

Forecasting of industrial coke quality at JSC EVRAZ NTMK based on data of passive industrial experiment. Report 1. Forecasting of CSR and CRI of industrial coke

2021 ◽  
Vol 77 (11) ◽  
pp. 1124-1135
Author(s):  
Yu. A. Zolotukhin ◽  
N. A. Berkutov ◽  
V. V. Kuprygin ◽  
S. N. Kupriyanova
Keyword(s):  
Mathematical Models ◽  
Coke Quality ◽  
Influence Factor ◽  
Methodological Approach ◽  
Coke Production ◽  
Industrial Experiment ◽  
The Matrix ◽  
Report Data ◽  
Coke Batteries ◽  
Dry Quenching

A forecast of coke quality takes a special place in the coke production, since it enables to increase efficiency of management of batching process of various by composition and properties coals and production of coke of stably high and required quality with minimal costs. Description of a methodological approach to processing of passive industrial experiment data of blends coking at Coke production department of JSC EVRAZ NTMK presented by application selective (general) matrix. The matrix accounts various multilevel values of influence factor CSR and CRI of coke - a complex index of coking ability of blends K.п.к.Vo. It was shown that the proposed approach provides wide variations of response function (CSR/CRI) at symmetrical enough matrix, excluding predominance of any particular area of values of indices K.п.к.Vo and CSR/CRI. By applying the passive industrial experiment, based on processing of actual report data of industrial blends coking at the coke batteries No. 5-6 (wet quenching) and No. 9-10 (dry quenching) by selective matrix, mathematical models of forecast of quality of industrial coke by wet and dry quenching (CSR/CRI) were elaborated depending on coal charges properties (K.п.к.Vo) at the existing modes of their preparation and coking at the coke batteries No. 5-6 and 9-10. Verification of accuracy of the mathematical models of coke quality forecast at wet and dry quenching (CSR/CRI) processing a large actual material of industrial coking (62 coking operations in the coke batteries No. 5-6 and 58 coking operations in the coke batteries No. 9-10 showed accuracy good enough for practical application of forecasting indices CSR and CRI of industrial coke of wet and dry quenching.

scholarly journals Tongue Movements in Feeding and Speech

2003 ◽  
Vol 14 (6) ◽  
pp. 413-429 ◽  
Author(s):  
Karen M. Hiiemae ◽  
Jeffrey B. Palmer
Keyword(s):  
Sound Production ◽  
Imaging Techniques ◽  
Methodological Approach ◽  
Kinetic Chain ◽  
Temporal Relationships ◽  
Functional Models ◽  
The Matrix ◽  
Tongue Movements ◽  
Tongue Surface ◽  
Intrinsic Muscles

The position of the tongue relative to the upper and lower jaws is regulated in part by the position of the hyoid bone, which, with the anterior and posterior suprahyoid muscles, controls the angulation and length of the floor of the mouth on which the tongue body ‘rides’. The instantaneous shape of the tongue is controlled by the ‘extrinsic muscles’ acting in concert with the ‘intrinsic’ muscles. Recent anatomical research in non-human mammals has shown that the intrinsic muscles can best be regarded as a ‘laminated segmental system’ with tightly packed layers of the ‘transverse’, ‘longitudinal’, and ‘vertical’ muscle fibers. Each segment receives separate innervation from branches of the hypoglosssal nerve. These new anatomical findings are contributing to the development of functional models of the tongue, many based on increasingly refined finite element modeling techniques. They also begin to explain the observed behavior of the jaw-hyoid-tongue complex, or the hyomandibular ‘kinetic chain’, in feeding and consecutive speech. Similarly, major efforts, involving many imaging techniques (cinefluorography, ultrasound, electro-palatography, NMRI, and others), have examined the spatial and temporal relationships of the tongue surface in sound production. The feeding literature shows localized tongue-surface change as the process progresses. The speech literature shows extensive change in tongue shape between classes of vowels and consonants. Although there is a fundamental dichotomy between the referential framework and the methodological approach to studies of the orofacial complex in feeding and speech, it is clear that many of the shapes adopted by the tongue in speaking are seen in feeding. It is suggested that the range of shapes used in feeding is the matrix for both behaviors.

Energy Harvesting and Regeneration from the Vibration of Suspension System

2014 ◽  
Vol 699 ◽  
pp. 800-805 ◽  
Author(s):  
Mohd Azman Abdullah ◽  
Noreffendy Tamaldin ◽  
Muhammad Afiq Mohamad ◽  
Rahiman Salmi Rosdi ◽  
Mohd Noor Ikhwan Ramlan
Keyword(s):  
Computer Aided Design ◽  
Feasibility Studies ◽  
Electrical Energy ◽  
Energy Regeneration ◽  
Time Consumption ◽  
The Matrix ◽  
Weighted Factor ◽  
Regeneration Capability ◽  
Coil Winding ◽  
Aided Design

Two conceptual designs of energy regenerative suspension have been developed using commercial computer aided design (CAD) software. The designs are based on the available conventional suspension. They consist of basic magnet and coil for electrical energy regeneration and additional components for magnet support and coil winding circular holder. The selection of the design is based on weighted matrix which consists of reliability, cost, time consumption and weight. The score of the matrix is formulated based on relative weighted factor among the selections. All designs are fabricated using selected and available materials. The actual cost, time consumption and weight of the suspensions are compared with the theoretical weighted scores. Standard processes of cuttings, fittings and welding are performed in fabrication. Suitable magnet design is attached on the suspensions. The other moving part of the suspensions is attached by coil and coil holder. The suspensions are tested with various strokes and frequencies for feasibility studies and energy regeneration capability using suspension test rig. The evaluation of the suspensions is performed based on actual experimental results of voltage and power regenerated.

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