scholarly journals A novel laboratory pushing the limits for optics-based basic turbulence investigations

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Simon Lautrup Ribergaard ◽  
Yisheng Zhang ◽  
Haim Abitan ◽  
Jakob Skov Nielsen ◽  
Niels Steenfeldt Jensen ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Mechanical Engineering ◽  
Intermediate Scale ◽  
Experimental Strategy ◽  
Current State ◽  
Theoretical Investigations ◽  
Scale Turbulence ◽  
Underlying Processes ◽  
Objective Being ◽  
Respective State

Developments in theoretical investigations and experimental techniques are reaching a level of maturity for which it is finally becoming possible to answer some of the most pressing questions in turbulence. The prevailing classical theories all have their strengths and drawbacks based on their respective principal assumptions. To better understand the implications of these assumptions, we have developed a theoryintensive experimental strategy. For these purposes, a laboratory has been established at the Department of Mechanical Engineering, Technical University of Denmark. The objective being to provide the data necessary to test the (bounds of) validity of the existing theories; Most prominently the classical Richardson-Kolmogorov-Batchelor paradigm, but also other generally adopted views such as Rapid Distortion Theory and Equilibrium Similarity. The measurements will be analyzed within a novel theoretical framework that enables not only quantification of the degree to which the small and intermediate scale turbulence behaves according to the existing theories (and their central assumptions), but also unveiling the underlying processes that create the respective state of turbulent flow. The present work will describe the current state of the developments of building up the laboratory.

scholarly journals Possibilities of Using Brownfields After Mining and Processing of Mineral Resources in Slovakia

2019 ◽  
Vol 105 ◽  
pp. 02023
Author(s):  
Zuzana Šimková ◽  
Andrea Seňová ◽  
Adriana Divoková ◽  
Michaela Očenášová ◽  
Peter Varga
Keyword(s):  
Mechanical Engineering ◽  
Slovak Republic ◽  
Mineral Resources ◽  
Current State ◽  
Unused Land ◽  
Environmental Burdens ◽  
Degree Of Degradation ◽  
The Way

The article deals with possibilities of brownfields using after mining and processing of mineral resources in the Slovak Republic, which represent not enough used or unused land, including administrative buildings or mechanical engineering objects. These types of brownfields are often accompanied by environmental burdens in various forms and levels of contamination of individual environmental components. Brownfields, whose degree of degradation and contamination is directly determined by the way of mining and processing of mineral resources, represent the so-called brown investments, which do not benefit the region where the brownfields are currently located. The article points to the current state of existence of environmental burdens as a result of mining and processing of mineral resources, which is also considered negative determinants of their occurrence. Based on the prioritization of negative and positive determinants of the possible use of brownfields after mining and processing of mineral resources, it concludes with a categorization of their possible further use.

scholarly journals Integration Processes In Russia Engineering: Condition For Business Continuity

2019 ◽  
Vol 297 ◽  
pp. 07004
Author(s):  
Ekaterina Strizhakova ◽  
Dmitry Strizhakov ◽  
Igor Simontsev
Keyword(s):  
Mechanical Engineering ◽  
Engineering Industry ◽  
Business Continuity ◽  
Economic Relations ◽  
Industrial Enterprises ◽  
Current State ◽  
Business Continuity Management ◽  
Management Procedure ◽  
Production Relations ◽  
Further Development

The article discusses the nature and main approaches to the integration of enterprises and organizations of mechanical engineering, introduces the concepts of «business continuity» and «business continuity management», offers recommendations for the implementation of a business continuity management procedure in mechanical engineering enterprises. According to the authors, integration refers to the process of strengthening production relations and economic relations, the organizational and economic merging of several components (components, parts) into a single whole, acquiring a higher quality than the arithmetic addition of parts. The limits of the integration processes of the organization are analyzed according to the three possible modern concepts of the company. The evolution and main stages of the integration processes in the engineering industry of Russia for the period from 1991 to the present are analyzed in the article. The current state of the level of integration in the engineering industry of Russia is also given. The assumption about the direct correlation between business continuity and the degree of integration in the engineering industry of Russia is formulated. The prospects for the further development of the integration of industrial enterprises in Russia are evaluated.

scholarly journals The current state of professional training of mechanical engineering specialists in Ukraine

2020 ◽  
Vol 5 (1) ◽  
pp. 9-17
Author(s):  
Sofiia Dembitska ◽  
◽  
Iryna Kobylyanska ◽  
Sergii Puhach ◽  
◽  
...  
Keyword(s):  
Mechanical Engineering ◽  
Professional Training ◽  
Research Problem ◽  
Machine Building ◽  
Building Industry ◽  
Practical Training ◽  
Current State ◽  
Competency Based ◽  
Definition Of ◽  
Different Levels

The article analyzes the features of professional training of future employees of the machine-building industry in higher education institutions of Ukraine. The existing developments on the research problem and practical aspects of training future specialists in mechanical engineering are analyzed. The object of research is the process of professional training of future specialists in mechanical engineering. The purpose of this article is to analyze the features of professional training of future specialists in the machine-building industry with further identification of problems and prospects for improving the professional training of future specialists in mechanical engineering. Based on the analysis of curricula for bachelors and masters of mechanical engineering, the structure of the study load by cycles of disciplines is established. In particular, the share of humanitarian, natural, professional and practical training of future workers in the machine-building industry is determined. The directions of improvement of professional training of future specialists of mechanical engineering by the analysis and adaptation of general didactic principles concerning definition of the maintenance of education are defined: the account of social conditions and needs of a society; compliance of the content of education with the goals of the chosen model of education; structural unity of the content of education at different levels; unity of semantic and procedural aspects of education; accessibility and environmental compliance. Prospects for further research are the development of methodological support for the training of future specialists in engineering specialties on the basis of a competency-based approach

scholarly journals PROSPECTS OF INNOVATIVE DEVELOPMENT OF THE MACHINE-BUILDING INDUSTRY IN AZERBAIJAN

2021 ◽  
Vol 16 (06) ◽  
pp. 37-42
Author(s):  
Natavan Ibragimova Natavan Ibragimova
Keyword(s):  
Economic Development ◽  
Mechanical Engineering ◽  
Machine Building ◽  
Building Industry ◽  
Industrial Complex ◽  
Innovative Development ◽  
Strategic Development ◽  
Current State ◽  
Qualified Personnel ◽  
Development State

The article discusses the priority directions of innovative development of the machine-building complex in Azerbaijan. Mechanical engineering as the most important branch of industry is an industry capable of ensuring sustainable and sustainable innovative development of the country's economy. However, in the era of globalization, this area has faced numerous problems. This can be explained by: a shortage of investments; outdated means of basic production; high competition in domestic and global markets; a shortage of qualified personnel, etc. All this makes it urgent to modernize and recreate the machine-building industry of Azerbaijan in accordance with the requirements of the time. Based on this necessity, the article examines the aspects of sustainable economic development of the machine-building industrial complex. At the end of the article, assessing the current state of the machine-building industrial complex of Azerbaijan, strategic directions of its scientifically-based innovative economic development are proposed. Keywords: strategic development, mechanical engineering, competitiveness, innovative development, state support

Trends and prospects of developing the export potential of Ukraine’s machine building industry

2021 ◽  
Vol 92 (1) ◽  
pp. 43-50
Author(s):  
Olena Liahovska
Keyword(s):  
Mechanical Engineering ◽  
Technological Development ◽  
Labour Force ◽  
Production Capacity ◽  
Machine Building ◽  
Global Market ◽  
Engineering Industry ◽  
Building Industry ◽  
Current State ◽  
Current Production

The purpose of the article is to analyse the current state of development of Ukraine’s mechanical engineering, looking at export trends of mechanical engineering products across product groups and the main importing countries. The analysis indicates that Ukrainian exports of engineering products have declined significantly in recent years. The low export orientation of machine-building production is mainly due to the low level of innovation investment, as a result of which the technological development of Ukraine’s machine building industry not aligned with the requirements of the global market. The author indicates directions of machine-building production that can make the Ukrainian industry more competitive in the future arguing that thanks to the current production capacity and technological skills, availability of the labour force, research institutions, opportunities for international cooperation, Ukraine is well-positioned to increase the export potential of the mechanical engineering industry.

Theories of diversity in disease ecology

2020 ◽  
pp. 221-242
Author(s):  
T. Alex Perkins ◽  
Jason R. Rohr
Keyword(s):  
Community Assembly ◽  
Host Species ◽  
Disease Ecology ◽  
Theoretical Work ◽  
Host Diversity ◽  
Pathogen Diversity ◽  
Current State ◽  
Theoretical Investigations ◽  
Single Host ◽  
Insight Into

Early theoretical developments in disease ecology overwhelmingly focused on interactions between a single pathogen and a single host. Today, it is well understood that numerous pathogens circulate among multiple host species, that some pathogens are comprised of many distinct strains, and that community ecology offers important perspectives for gaining insight into the inner workings of these complex ecological systems. Here, we focus on two topics that have received intense focus in theoretical investigations of multi-host and multi-pathogen systems, respectively. First, we review developments in a rather contentious debate around relationships between host diversity and disease. The current state of theory suggests that divergent views can be reconciled by considering where along a continuum of host diversity a given system lies, which is thought to affect how community assembly processes shape host species composition and overall abundance. Second, we review developments surrounding coexistence and other outcomes in communities of interacting pathogens. Ultimately, coexistence in pathogen communities can be explained by the same mechanisms that explain coexistence in any community, yet certain ways in which pathogens interact make the tailoring of theory specific to this context well justified. Despite a rich literature on host and pathogen diversity, there has been remarkably little theoretical work at their interface. To stimulate fresh developments to theories of diversity in disease ecology, we highlight aspects of ecological theory that may have been underutilized in theoretical work on host and pathogen diversity to date.

Investigations on Large Turbine Bearings Working Under Transitional Conditions Between Laminar and Turbulent Flow

1989 ◽  
Vol 111 (4) ◽  
pp. 628-634 ◽  
Author(s):  
G. Hopf ◽  
D. Schu¨ler
Keyword(s):  
Turbulent Flow ◽  
High Surface ◽  
Operating Conditions ◽  
Test Results ◽  
Special Cases ◽  
Tilting Pad ◽  
Theoretical Investigations ◽  
Laminar And Turbulent Flow ◽  
High Degree ◽  
Gap Width

The report deals with investigations on large turbine bearings, a tilting pad bearing, and an elliptical bearing. In special cases, the maximum babbitt temperatures show a sudden leap, caused by a slight change of the operating conditions. According to the test results, the temperatures do not change within the whole bearing, but only in a region near the minimum gap width. As proved by comparative theoretical investigations, the reason for this temperature leap is a local transition between laminar and turbulent flow, changing the thermal conductivity within the oil film to a high degree. Thus, the consideration of thermal diffusion in the energy equation is essential for precalculating this phenomenon. As a consequence of locally high surface temperatures, considerably large thermoelastic deformations are observed at both test bearings. For this reason the comparative calculations are based upon measured gap width profiles.

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