scholarly journals Partial Renewal is a Tool for an Increase in the Environmental Efficiency of the Worn-out Power Facilities

2021 ◽  
pp. 47-51
Author(s):  
Oleksandr Voinov ◽  
Yuriy Elkin
Keyword(s):  
Natural Environment ◽  
Low Cost ◽  
Harmful Effect ◽  
Power Engineering ◽  
Power Equipment ◽  
Technological Parameters ◽  
Harmful Action ◽  
Successful Fulfillment ◽  
Process Elements ◽  
Domestic Power

The mankind created the global production that has an increasingly harmful effect on the natural environment. The present-day condition of natural environment causes much concern. A global environmental problem has inevitably emerged and now it requires a decrease in the intensity of the harmful action of available productive facilities. The purpose of the research done was to substantiate and find a potential opportunity for the use of a new approach to an increase in the level of ecological compatibility due to a partial renewal of the worn-out equipment. A substantial portion of the domestic energy equipment has a low level of the process-related functioning efficiency (including ecological efficiency). A global practice shows that the problems of the improvement of technological parameters can be solved in a different way to provide failure –free functioning of power facilities. The analysis of the circumstances existing nowadays in the field of the interaction of domestic power engineering and natural environment gives us an opportunity to adhere to the opinion that the use of the method of partial renewal is objectively affordable and it is a highly efficient tool for the reduction of the degree of harmful action on the part of power equipment. The purpose of this research paper was to show technological opportunities of the method of a partial renewal of worn-out engineering facilities (first of all power equipment and especially boiler plants) as an affordable tool for a decrease of the degree of their harmful action on the environment. Among the branches of the domestic industry, the power engineering branch needs badly a partial renewal and in the first turn these are boiler plants. This type of renewal is of vital importance for Ukraine that possesses a huge fleet of completely worn-out boiler plants. It is advisable to perform an integrated partial renewal. The partial renewal can involve all or individual parts of the entire chain of process elements. A successful fulfillment of the program of partial renewal is defined by a high quality control of the system of scientific and organizational-&-engineering problems relating to the renewal arrangement and realization. An issue relating to an index of the estimation of the extent of renewal of engineering facilities is of great importance. The capital inputs into the partial renewal are always justified for all intents and purposes. As for the conception of the renewal of the worn-out equipment the partial renewal can become an important launching low-cost step that will simplify the expected realization of the program of complete renewal.

scholarly journals DETERMINATION OF FORMATION REGIMES FOR BILAYER COBALT DYSPROSIUM INTERMETALIC SURFACE ALLOY

2019 ◽  
Vol 6 ◽  
pp. 3-8
Author(s):  
Vadym Kovalenko ◽  
Denis Kondratyev ◽  
Valerii Kotok ◽  
Olga Chernova ◽  
Ihor Kovalenko ◽  
...  
Keyword(s):  
Low Cost ◽  
Construction Materials ◽  
Development Stage ◽  
Mass Change ◽  
High Tech ◽  
Technological Parameters ◽  
Specific Mass ◽  
Temperature Range ◽  
Diffusion Layers ◽  
Modern Development

High tech industrial fields on modern development stage are in need of construction materials with an optimal ratio of volume and surface properties, along with low cost of material itself. As evidenced by studies, in order to give a set complex of properties to a workpiece that operates under specific conditions, it is often sufficient to only modify its surface area. Over the course of studies, by means of gravimetric, influence of technological parameters (temperature and time samples are kept in the melt) on specific mass change of cobalt samples, that act as substrate, during electroless diffusive saturation with dysprosium in eutectic melt of lithium and potassium chlorides have been studied. A mathematical dependency was established for specific mass change of cobalt samples on time spent in melt for temperature range of 873–973 K. Composition of intermetallic coats obtained on surface of cobalt samples was studied means of EDX and SEM analyses. It was discovered, that for chosen temperature range, diffusion layers formed on surface of cobalt samples consists of two structural zones that correspond to Co-Dy and Cp2Dy phases.

The Influence of Some Technological Parameters on the Fracture Toughness of Ceramic Materials

2010 ◽  
Vol 446 ◽  
pp. 11-21
Author(s):  
Viorel Goanta ◽  
Marian Mares
Keyword(s):  
Fracture Toughness ◽  
Low Cost ◽  
High Hardness ◽  
Fem Analysis ◽  
Ceramic Materials ◽  
Indentation Load ◽  
Test Material ◽  
Vickers Indentation ◽  
Technological Parameters ◽  
Material Fracture

In order to determine the fracture toughness of the materials presenting high hardness values in the superficial layers, the Vickers micro-indentation was imposed as a reliable procedure. That method became attractive because of the relative simplicity of the experimental technique and because of its low cost. There are several calculus relationships that could be applied using the data provided by that method, in order to determine the material fracture toughness. The determination of fracture toughness using the Vickers indentation method is based on the analysis of radial cracks propagation, from the corners of the indentation trace. The length of these cracks is connected with the material fracture toughness, on the basis of some semi-empirical calculus relations that are taking into account the indentation load and some physical characteristics of the test material, as Young’s modulus and Poisson’s coefficient. In the present paper, fracture toughness was determined on a series of ceramic samples, made of the same material, but with different geometrical shapes and obtained by applying different technological procedures. The influence of some technological parameters on the fracture toughness was evaluated. The material fracture toughness was determined, into the vicinity of the propagated cracks (in a sample that could be a final product), on an area with a specified geometric contour. As a preliminary stage, a step by step FEM analysis was made, into the Vickers indentation material region, for different values of indentation load. In this manner, it was proved that the maximum stress value, on the perpendicular direction, as related to the crack diagonal plane, is always located at the peak of the indentation trace, and that is the effective start-point of cracking, for this type of indentation.

Assorted wood harvesting

2020 ◽  
Author(s):  
Andrey Mehrencev ◽  
Vasiliy Azarenok ◽  
Eduard Gerc
Keyword(s):  
Biological Sciences ◽  
Educational Institutions ◽  
Full Time ◽  
Power Equipment ◽  
Technological Parameters ◽  
Wood Harvesting ◽  
Wood Processing ◽  
Part Time ◽  
Forest Enterprises ◽  
Machine Systems

The tutorial shows the possibility and feasibility of varietal wood harvesting using various machine systems, including harvester — forwarder complexes. The main forestry and technological parameters of various logging operations, their technological features and scope are also considered. It is intended for bachelors and undergraduates of higher educational institutions studying in the areas of Forestry", "technology of logging and wood processing industries", postgraduates of full-time and part-time training in the areas of "Forestry", "Biological Sciences", "Technologies, means of mechanization and power equipment in agriculture, forestry and fisheries", researchers, employees of forestry and environmental organizations. The issues discussed in the textbook are of interest to employees of forest enterprises of various forms of ownership and related industries engaged in logging."

Outdoor adventure and successful ageing

2012 ◽  
Vol 33 (4) ◽  
pp. 644-665 ◽  
Author(s):  
MIKE BOYES
Keyword(s):  
Natural Environment ◽  
Social Engagement ◽  
Low Cost ◽  
Successful Ageing ◽  
Outdoor Adventure ◽  
Mixed Methods Design ◽  
Community Based ◽  
Research Outcomes ◽  
Environmental Engagement ◽  
Preventative Health

ABSTRACTThis article explores how outdoor adventure activities in a New Zealand community-based programme are experienced and understood as successful ageing strategies. Outdoor adventures are seen as positive leisure experiences that include challenging physical activity, social engagement and the natural environment. Using a sequential exploratory mixed-methods design, a combination of seven interviews and a survey (N=80) were conducted with a Third Age adventures group. The research outcomes confirmed the attraction of adventure for this cohort. Risk engagement and uncertainty were perceived as less important in favour of emotional, social and environmental engagement through fun, excitement and pleasure. The natural environment was considered integral and defining of the experience with the participants demonstrating a strong environmental ethos. Opportunities for building social capital were plentiful and well illustrated. The benefits of engagement for health, wellbeing and successful ageing are identified through the physical, social and psychological domains. The research supports adventure participation as a successful ageing strategy that is relatively low cost, community based, has many preventative health benefits, builds communities and embraces the environment.

scholarly journals The complex of machines for low-cost artificial reforestation in the taiga zone

2021 ◽  
Vol 875 (1) ◽  
pp. 012089
Author(s):  
A Tsypouk ◽  
A Rodionov ◽  
D Druchinin
Keyword(s):  
Low Cost ◽  
Mineral Soil ◽  
Forest Plot ◽  
Taiga Zone ◽  
State University ◽  
Technological Parameters ◽  
Young Stand ◽  
Commercial Thinning ◽  
Soil Scarification ◽  
Forest Nurseries

Abstract Problems of mechanization of artificial reforestation in the taiga zone are increasing the productivity of manual labour and reducing the costs of subsequent young stand treatment (early tending and early pre-commercial thinning). Petrozavodsk State University has developed the complex of machines and technologies capable to solve these problems. This complex includes: seeder, root-cutter, dynamic hole-maker and mechanical mounder. Seeder and root-cutter are intended for growing enlarged seedlings with an open root system in forest nurseries. Seeder provides mechanization of sowing seeds. Root-cutter is used for pruning the root systems of seedlings during cultivation. Dynamic hole-maker provides strip soil clearing, surface tillage and preparation of holes for manual planting of seedlings. The hole-maker is also capable to make soil scarification and sowing forest seeds. Mechanical mounder provides strip clearing in the forest plot and creation of humus mounds with mineral soil cover for manual planting of seedlings. Basic technological parameters of the complex of machines have been also substantiated at the Petrozavodsk State University.

scholarly journals Analysis of reinforced concrete structures through the ultrasonic pulse velocity: technological parameters involved

2017 ◽  
Vol 10 (2) ◽  
pp. 358-385 ◽  
Author(s):  
D.S. ADAMATTI ◽  
A. LORENZI ◽  
J. A. CHIES ◽  
L.C.P. SILVA FILHO
Keyword(s):  
Reinforced Concrete ◽  
Low Cost ◽  
Concrete Structures ◽  
Ultrasonic Pulse Velocity ◽  
Correct Choice ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Reinforced Concrete Structures ◽  
Technological Parameters ◽  
Surface Mapping

Abstract The application of Nondestructive Testing methods (NDT) may be an interesting strategy to monitor the condition state of reinforced concrete structures, especially when there are problems related to mixing, conveying or placing the concrete. Among the NDT methods, the Ultrasonic Pulse Velocity (UPV) has been one of the most used in various fields of civil engineering, due to the ease of operation, low cost, test velocity and low level of damage to the surface analyzed. This work aims to study the influence of certain technological variables in the results obtained through UPV tests. With this aim two large blocks were cast at the laboratory, with dimensions close to real concrete elements. One of the elements was reinforcement with steel meshes on both sides while the other was cast without reinforcement. Inside these elements objects were introduced to reproduce internal concrete flaws. To facilitate the analysis the results were represented by means of a surface mapping image technique and were also subjected to statistical analysis. Through the study it was demonstrated that the correct choice of test parameters is crucial to obtain a right interpretation of UPV results from real structures.

Finite Element Analysis to Improve the Accuracy of ABS Plastic Parts Made by Desktop 3D Printing Method

2015 ◽  
Vol 760 ◽  
pp. 509-514 ◽  
Author(s):  
Răzvan Păcurar ◽  
Ancuţa Păcurar ◽  
Florin Popişter ◽  
Anca Popişter
Keyword(s):  
Finite Element ◽  
Fused Deposition Modeling ◽  
Tool Path ◽  
Low Cost ◽  
Small Scale ◽  
Slice Thickness ◽  
Technological Parameters ◽  
Element Analysis ◽  
Fused Deposition ◽  
3D Printers

The development of low-cost desktop versions of three-dimensional (3D) printers has made these devices widely accessible for rapid prototyping and small-scale manufacturing in home and office settings. Many desktop 3D printers rely fused deposition modeling process, that it is based on heated thermoplastic filiform material that it is extrused through a nozzle and deposited afterwards onto a heated building platform. The extruding accuracy in part fabrication is subject to transmission machinery and filament diameter on one hand and the technological parameters that are used in the manufacturing process (raster angle, tool path, slice thickness, build orientation, deposition speed, building temperature, etc.) on the other hand. The presented work try to investigate by using the finite element method, how the building temperature in close connection with the material characteristics is influencing the accuracy of a test part that has been designed in order to callibrate an Desktop 3D Printer machine that has been originally designed and produced at the Technical University of Cluj-Napoca (TUC-N).

scholarly journals BOILER PLANTS AND THE ENVIRONMENT PROTECTION FROM INDUSTRY HARMFUL EFFECTS

2021 ◽  
pp. 128-136
Author(s):  
O.P. Voinov ◽  
◽  
Yu.G. Elkin ◽  
Keyword(s):  
Natural Environment ◽  
Power Plants ◽  
Negative Impact ◽  
Thermal Power ◽  
Harmful Effect ◽  
Steam Boiler ◽  
Self Healing ◽  
Technical Object ◽  
Environmental Friendliness ◽  
Harmful Effects

Abstract. At present, environmental problems have become aggravated. The production process has a negative impact on the natural environment. It accumulates these harmful secondary effects. The degree of their harmful effects is increasing rapidly. The natural environment, taking into account its self-healing, undergoes dangerous, irreversible changes in its state. Now it is possible to talk only about slowing down this process. The ability to slow down and then stop the increase in the harmful impact on the natural environment is the essence of the nature conservation activities of humanity. It is necessary to move from a strategy of using the natural environment to a strategy of parity interaction with it. The problem was discussed at the Kyoto and Paris conferences of global importance. Among the branches of production, the most dangerous for the natural environment is energy. Its harmful effect is complex. Defending against it is a complex environmental issue. The adopted energy saving program actively contributes to solving the problem of saving the natural environment from degradation and death. The most environmentally aggressive element of power plants is solid fuel boiler plants. Reducing the intensity of their impact is the main direction of activities to protect the natural environment. The most difficult technical object is considered the power unit of a large thermal power plant. The most difficult part is the boiler plant. The most difficult element is the steam boiler. The level of environmental friendliness of the boiler is highly dependent on the degree of its wear. The problem of updating the fleet of boilers is of current importance. The general line of improving the environmental friendliness of production should be considered an increase in the level of environmental friendliness of power plants, especially those using fossil fuels, and a decrease in their emissions of carbon dioxide and heat. It is necessary to improve boiler installations, to increase their efficiency level, and the quality of their management. It is important to ensure the modernization of worn-out boiler installations based on their complete or partial renewal. In the formation of the power engineering of the future, the socio-psychological position of humanity must be radically changed.

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