scholarly journals The Quality of the Tribosystem as a Factor of Wear Resistance

2018 ◽  
Vol 7 (4.3) ◽  
pp. 25
Author(s):  
Viktor Vojtov ◽  
Abliatif Biekirov ◽  
Anton Voitov
Keyword(s):  
Thermal Diffusivity ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Methodological Approach ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Quality Value ◽  
Definition Of ◽  
The Relationship

The purpose of this work was to develop a criterion for estimating the quality factor of the tribosystem and to assess its effect on wear rate, friction coefficient and run-in time. The basis of the methodological approach when developing a criterion for the quality of the tribosystem is the parameters that take into account the construction of the tribosystem, the thermal diffusivity of materials and the loading conditions of the tribosystems.The definition of the quality of the tribosystem has been further developed, which, unlike the known one, takes into account the geometric dimensions and kinematic scheme of the tribosystem, the thermal diffusivity of materials and the rate of propagation of deformation in the surface layers of the triboelement materials during their contact interaction. Theoretical and experimental studies established the relationship between the quality value, wear rate and the friction coefficient in the process of running-in. It is shown that the increase in quality helps to reduce the above-mentioned parameters.The relationship between the running-in time and the quality value is established. It is shown that the process of running-in can be controlled. To reduce the running-in time, it is necessary to reduce the sliding speed during the transient process and to increase the tribological properties of the lubricating medium. The presented theoretical and experimental studies allow us to state that the quality of tribosystems Q can be a measure of the potential ability of the tribosystem to adapt (adapt) to operating conditions, providing the maximum resource.  

Assessment of the quality factor of tribosystems and relationship with tribological characteristics

2020 ◽  
Vol 98 (4) ◽  
pp. 20-26
Author(s):  
V. Vojtov ◽  
◽  
A. Voitov ◽  
Keyword(s):  
Quality Factor ◽  
Experimental Studies ◽  
Propagation Rate ◽  
Operating Conditions ◽  
Maximum Effect ◽  
Surface Layers ◽  
Steady State Operation ◽  
Definition Of ◽  
Friction Surfaces ◽  
The Relationship

The definition of the quality factor of the tribosystem has been further developed, which, unlike the known one, takes into account not only the geometric dimensions of the tribosystem, thermal diffusivity of triboelement materials, lubricating medium and deformation propagation rate in the surface layers of the material, but also the function of changing the rheological properties of the surface layers of materials during running-in and their increase during running-in. Theoretical studies have established that three parameters have the maximum effect on the quality factor: sliding speed, roughness of friction surfaces and lubricating medium. Experimental studies have established the relationship between the value of the quality factor, wear rate and coefficient of friction during steady-state operation of tribosystems. It has been shown that an increase in the figure of quality factor reduces the above parameters, and the criterion itself Qmax is a measure of the potential of the tribosystem adapt to the operating conditions.

Two Theories of Effective Government

2017 ◽  
Author(s):  
Johannes Lindvall
Keyword(s):  
Political Science ◽  
Political Institutions ◽  
Public Policies ◽  
Methodological Approach ◽  
Decision Makers ◽  
Precise Definition ◽  
Policy Changes ◽  
Political Decision ◽  
Definition Of ◽  
The Relationship

This chapter introduces the problem of “reform capacity” (the ability of political decision-makers to adopt and implement policy changes that benefit society as a whole, by adjusting public policies to changing economic, social, and political circumstances). The chapter also reviews the long-standing discussion in political science about the relationship between political institutions and effective government. Furthermore, the chapter explains why the possibility of compensation matters greatly for the politics of reform; provides a precise definition of the concept of reform capacity; describes the book's general approach to this problem; and discusses the ethics of compensating losers from reform; and presents the book's methodological approach.

scholarly journals The results of studies of eccentric tillage roller

2019 ◽  
Vol 126 ◽  
pp. 00010
Author(s):  
Ivan Sharonov ◽  
Vladimir Kurdyumov ◽  
Viktor Kurushin
Keyword(s):  
Experimental Studies ◽  
Soil Treatment ◽  
Dynamic Force ◽  
Theoretical Studies ◽  
Soil Density ◽  
Operating Modes ◽  
Factors Influencing ◽  
The Relationship ◽  
Required Quality

Developed by eccentric tillage rink, which ensures the desired quality of the soil and increase the yield of crops. As a result of theoretical studies, an expression for determining the dynamic force that increases the intensity of crumbling soil lumps, depending on the regime parameters of the rink. In addition, the relationship between the power required when driving the rink, its parameters. The factors influencing the process of tillage by the developed roller are determined. As a criterion of optimization, the adopted coefficient of compliance with for the density soil of benchmark, which characterizes the quality of soil rolling from the position of compliance of soil density with agrotechnical requirements. As a result of experimental studies, the parameters and operating modes of the roller are optimized, at which the required quality of soil treatment is achieved.

scholarly journals Modeling of Tool Wear in Vibration Assisted Nano Impact-Machining by Loose Abrasives

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Sagil James ◽  
Murali M. Sundaram
Keyword(s):  
Wear Rate ◽  
Tool Wear ◽  
Experimental Studies ◽  
Tool Wear Rate ◽  
Nanoscale Material ◽  
Workpiece Surface ◽  
Atomic Force ◽  
Hard And Brittle Materials ◽  
Afm Probe

Vibration assisted nano impact-machining by loose abrasives (VANILA) is a novel nanomachining process that combines the principles of vibration assisted abrasive machining and tip-based nanomachining, to perform target specific nanoabrasive machining of hard and brittle materials. An atomic force microscope (AFM) is used as a platform in this process wherein nanoabrasives, injected in slurry between the workpiece and the vibrating AFM probe which is the tool, impact the workpiece and cause nanoscale material removal. The VANILA process are conducted such that the tool tip does not directly contact the workpiece. The level of precision and quality of the machined features in a nanomachining process is contingent on the tool wear which is inevitable. Initial experimental studies have demonstrated reduced tool wear in the VANILA process as compared to indentation process in which the tool directly contacts the workpiece surface. In this study, the tool wear rate during the VANILA process is analytically modeled considering impacts of abrasive grains on the tool tip surface. Experiments are conducted using several tools in order to validate the predictions of the theoretical model. It is seen that the model is capable of accurately predicting the tool wear rate within 10% deviation.

Construct and energy reserves improvement of exploitative properties rail friction brake

2020 ◽  
pp. 26-30
Author(s):  
Yuriy Vladimirovich Krivosheya ◽  
◽  
Tatyana Leonidovna Ripol-Saragosi ◽  
Keyword(s):  
Friction Coefficient ◽  
Experimental Studies ◽  
Disc Brake ◽  
Energy Reserves ◽  
Analytical Assessment ◽  
Improved Performance ◽  
Design Options ◽  
The Relationship ◽  
Friction Brake

The paper gives an assessment of the design and energy reserves for improving the operational properties of the railway friction brake under the existing mass-dimensional restrictions and the growth of braking energy. The criterion for assessing the operational properties of the friction brake is the friction coefficient and contact energy load. The results of experimental studies of the relationship between the frictional characteristics of the disc brake and the affecting structural and loadspeed factors are presented. Design options for railway friction brakes are proposed that provide improved performance. A comparative analytical assessment of the contact energy load of new friction brake and classic disc brake options has been performed.

scholarly journals Cancer Cachexia: Mechanisms and Clinical Implications

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Claire L. Donohoe ◽  
Aoife M. Ryan ◽  
John V. Reynolds
Keyword(s):  
Host Response ◽  
Cancer Cachexia ◽  
Resting Energy Expenditure ◽  
Poor Quality ◽  
Therapeutic Agents ◽  
Progressive Weight Loss ◽  
Slow Progress ◽  
Definition Of ◽  
The Relationship

Cachexia is a multifactorial process of skeletal muscle and adipose tissue atrophy resulting in progressive weight loss. It is associated with poor quality of life, poor physical function, and poor prognosis in cancer patients. It involves multiple pathways: procachectic and proinflammatory signals from tumour cells, systemic inflammation in the host, and widespread metabolic changes (increased resting energy expenditure and alterations in metabolism of protein, fat, and carbohydrate). Whether it is primarily driven by the tumour or as a result of the host response to the tumour has yet to be fully elucidated. Cachexia is compounded by anorexia and the relationship between these two entities has not been clarified fully. Inconsistencies in the definition of cachexia have limited the epidemiological characterisation of the condition and there has been slow progress in identifying therapeutic agents and trialling them in the clinical setting. Understanding the complex interplay of tumour and host factors will uncover new therapeutic targets.

scholarly journals Optimization of Parameters and Operating Modes of Disc Sowing Device According to Seeding Uniformity Criterion

2018 ◽  
Vol 28 (3) ◽  
pp. 379-388
Author(s):  
Vladimir A. Ovchinnikov ◽  
Mikhail N. Chatkin ◽  
Alena V. Ovchinnikova
Keyword(s):  
Experimental Studies ◽  
Operating Conditions ◽  
Design Parameters ◽  
Optimal Parameters ◽  
Plant Growth And Development ◽  
Important Condition ◽  
Operating Modes ◽  
Favorable Conditions ◽  
Uniformity Criterion

Introduction. When cultivating agricultural crops, it is necessary to take into account the plants’ need for moisture, nutrients, location by area of nutrition, determining illumination, etc. Taking into account the biological characteristics of crops, various methods of sowing are used to create favorable conditions for plant growth and development. An important condition for sowing is the uniform arrangement of seeds along the sulcus, especially in the cultivation of testes of small-seeded cultures. A key role in the uniformity of seeding is provided by the design parameters and kinematic operating conditions of the sowing device. Materials and Methods. To determine the optimal parameters and operating modes of the disk sowing device, methods of factor experiment and multi-criteria optimization were used. Results. Mathematical models of the technological process of sowing seeds were obtained based of experimental studies. Conclusions. To ensure the improvement of the seeding quality of small seeds, the design parameters of the experimental seeder: х4 – is the diameter of the cell; х5 – the number of cells on the disk, will tend to the maximum values. The optimum circumferential speed of the sowing disk should be in the range from 0.127 to 0.192 m/s, and the speed of the machine’s movement is no more than 2 m/s.

scholarly journals Formation of mutual relations between enterprises and business partners in the process of preparation and production of new products

2021 ◽  
pp. 196-211
Author(s):  
Olena Iastremska ◽  
Hanna Strokovyc ◽  
Olesia Iastremska ◽  
Christos Kalantaridis ◽  
Mariann Veresne Somosi
Keyword(s):  
Factor Analysis ◽  
Methodological Approach ◽  
New Products ◽  
Machine Building ◽  
Business Partners ◽  
Study Results ◽  
Effective Models ◽  
The Relationship ◽  
Building Enterprises

This article summarizes the scientific approaches to improving the quality of relations between the enterprise and business partners in preparation for the release and production of new products in today's economic realities. The study's main purpose is to substantiate and develop a methodological approach for determining effective relationship models between enterprises and business partners to prepare and produce new products. The article presents a developed four-stage methodological approach. The first stage of the study presents an analysis of existing approaches to forming relationships between the enterprise and business-business partners to prepare and produce new products. In the second stage, factual data on machine-building industry enterprises' functioning were collected to determine the effectiveness of cooperation and success, which are the key components that improve the quality of relations between the enterprise and business partners in preparing new products. At the third stage, partners' priority was determined to characterize the quality of the relationship between machine-building enterprises and business-business partners. The fourth stage determined the relationship between the qualitative levels of business partners' priority and appropriate relationship models to prepare and produce new products. The study used expert methods, multidimensional factor analysis, additive convolution method, structural-logical method, graphical method. A survey of enterprise representatives was conducted to assess the effectiveness of cooperation on 12 surveyed machine-building enterprises. Partial indicators were identified and substantiated by multidimensional factor analysis, generalized for making decisions about business partner enterprises' existing opportunities to prepare and produce new products. Based on the calculation of the integrated indicator, partners' priority was determined. That characterized the quality of relations between machine-building enterprises and business-business partners in preparing and producing new products. According to the Harrington scale specified for the economic conditions of Ukraine, the qualitative levels of partner companies' priority were determined. The proposed effective models of relationships for preparing and producing new products are put in line with them. The study results could improve the quality and validity of the formation and maintenance of relationships between enterprises and business partners in preparing and producing new products.

scholarly journals الثنائية اللغوية في تعليم اللغة العربية

ASALIBUNA ◽  
2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Nur Qomari
Keyword(s):  
Arabic Language ◽  
Islamic State ◽  
Teaching Language ◽  
Quality Of Teaching ◽  
Bilingual Teaching ◽  
The World ◽  
World Class ◽  
Definition Of ◽  
The Relationship

Bilingualism in teaching is something to be done to make the quality of teaching more effective especially in the World Class University Like Islamic State Of University Maulana Malik Ibrahim Malang. This Article will be give information about implementation of Bilingulism in teaching. And also give information about the definition of bilingual and what kind of bilingual can be implemented especially in Arabic language teaching for the foreigner. Beside of information about the kind of the suitable bilingual in teaching language, This Article also inform how much of Arabic language acquisition when that language to be tought by bilingual method. And offcourse this give information about the relationship between the bilingual teaching language with the skills of language.

scholarly journals THEORETICAL BASES OF EXPERT PREVENTION: CONCEPT AND TASKS

2019 ◽  
Vol 20 (2) ◽  
pp. 151-162
Author(s):  
N. Filipenko ◽  
O. Uhrovetskyi ◽  
O. Sharapova
Keyword(s):  
Law Enforcement ◽  
Law Enforcement Agencies ◽  
Important Place ◽  
Forensic Institutions ◽  
Special Knowledge ◽  
The Subject ◽  
Definition Of ◽  
Conceptual Foundations ◽  
The Relationship

The article analyzes conceptual foundations, views and ideas concerning the essence of expert prevention. The relationship between the concepts of «prevention» and «prevention», which is in contact with each other, is investigated, because one of the main problems of the criminal investigation of the phenomenon of expert prevention is the ambiguity of both scientific understanding and the practical application of the corresponding conceptual-categorical apparatus. It is emphasized that the essence of expert prevention is the influence of the relevant subjects on crime through the use of special professional knowledge. That is, to the subject of forensic examination, should include studies of circumstances on the basis of which can be and should be developed scientific, organizational and technical measures of preventive nature. Proven that among the tasks of preventive nature, which can be solved by the staff of judicial-expert institutions, the development of aimed at forecasting in criminalistic aspects of circumstances contributing to the commission of crimes, taking into account the possibilities of certain types of expert research, should occupy an important place. It is proved that the preventive activities of forensic institutions of Ukraine should be carried out: in the production of examinations in specific criminal, administrative or civil cases; by summarizing expert, as well as forensic investigative practices; in the process of research on expert prevention; by providing on the basis of special knowledge of scientific and practical assistance to government agencies and public organizations in identifying circumstances conducive to the commission of crimes. In order to improve the quality of expert-preventive activities, the staff of the forensic institutions of Ukraine should pay maximum attention to the promotion of preventive activities among representatives of law enforcement and law enforcement agencies. On the basis of the analysis, the author’s definition of expert prevention is given: the activity of a forensic expert based on the laws and by-laws of normative legal acts, aimed at revealing the circumstances contributing to the commission of a crime, and the development of measures for their elimination with the use of special knowledge.

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