Comparative Study Concerning the Generation of some Circular Grooves by Radial Cold Rolling with Roller Tools and Cutting

2014 ◽  
Vol 1036 ◽  
pp. 246-251
Author(s):  
Eduard Niţu ◽  
Monica Iordache ◽  
Doina Iacomi
Keyword(s):  
Comparative Analysis ◽  
Cold Rolling ◽  
Economic Efficiency ◽  
Superficial Layer ◽  
Point Of View ◽  
Micro Hardness ◽  
Circular Profile ◽  
Materials Used ◽  
Cementation Steel

This study is part of the concerns that the authors have had in recent years, representing an extension of a research project funded consisting in modelling representative cold rolling processes of profiles. This paper presents a comparative analysis of quality of the superficial layer of a circular profile (grooves) obtained by two different processes: radial rolling with two roller tools and turning with radial feed. Also, the two processes are compared from the viewpoint of economic efficiency. The materials used for the experiments are frequently used to obtain pieces with circular grooves: two types of cementation steel and two types of heat treatable steel. The characteristics of the superficial layer which describe its quality and which are comparatively analyzed in connection to the two processes are: roughness, microstructure and micro-hardness. The economic efficiency of the two processes was assessed by means of the costs implied and the productivity of processing. The interpretation of the results obtained enabled stressing the advantages to generate circular grooves by cold radial rolling from the point of view of the quality of the superficial layer of pieces, as well as the limits of the use of this process from the viewpoint of economic efficiency.

scholarly journals Magnetic Levitation Cargo Ransport Role in World Economy

2019 ◽  
Vol 5 (2) ◽  
pp. 106-117 ◽  
Author(s):  
Sergey A. Smirnov ◽  
Olga Yu. Smirnova
Keyword(s):  
Economic Growth ◽  
Economic Efficiency ◽  
World Economy ◽  
Magnetic Levitation ◽  
Point Of View ◽  
Competitive Advantages ◽  
Use Of Resources ◽  
Cargo Transport ◽  
Cargo Transportation

Background: Currently, the car, water, railway, air and pipe transports are used for cargo and goods transportation. Each kind of cargo transport has its own specific competitive advantages that provide its most effective application at various stages of logistics chain. The economic efficiency of cargo transportation influences the overall economic efficiency, in particular, the gross domestic product. The quality of economic growth as applied to transport branch and its input to the national economy is relevant, since with the current organisation of different transport modes interaction, there are still high transaction costs. Aim: Study of influence of various modes of transport, including maglev transport, on the economy and economic growth. Methods: Theoretical and empirical. The paper considers the influence of various modes of transport, that operate in the cargo transport sphere, on the countrys economy. The comparison of existing modes of transport with the maglev transport from the point of view of desired effects is made. Results: The maglev transport possesses new properties and advantages, which makes it possible to view is as viable and able to provide a qualitative economic growth and resource-based economy if realised. Conclusion: The most efficient use of resources, the consumption of which should at least not increase and at most decrease, is achieved with the introduction of maglev transport into the transport system, as its economic properties already now excel those of the majority of other types of transport. It is obvious, as to the experts, that in transition to resource-based economy the maglev transport will be major transport for both cargo and passenger transit.

scholarly journals Comparative analysis of balancing of V6 engines with common- and split-pin crankshafts

2014 ◽  
Vol 156 (1) ◽  
pp. 3-12
Author(s):  
Ryszard MOSAKOWSKI
Keyword(s):  
Comparative Analysis ◽  
Point Of View ◽  
Reciprocating Motion ◽  
Bank Angle ◽  
Moments Of Inertia ◽  
Cylinder Bank ◽  
Mathematical Relation ◽  
Inertia Forces ◽  
Mathematical Relations

An analysis of balancing of V6 engines equipped with split-pin crankshafts with any cylinder bank angle based on the mathematical relations derived in the paper was carried out. A comparison of the quality of their balancing with engines equipped with common-pin crankshafts was also carried out. The bank angle ranges beneficial for balancing of moments of inertia forces in reciprocating motion were determined. A mathematical relation on the optimum value of the main counterweights in the function of the cylinder bank angle was derived as well. The advantages of the split-pin crankshafts from the point of view of balancing were also indicated also.

Comparative Study Concerning the Generation of some Circular Grooves by Cold Rolling with Wedge Tools and Cutting

2014 ◽  
Vol 1036 ◽  
pp. 298-303
Author(s):  
Doina Iacomi ◽  
Monica Iordache ◽  
Eduard Niţu
Keyword(s):  
Cold Rolling ◽  
Slope Angle ◽  
Superficial Layer ◽  
Machine Construction ◽  
Cold Plastic Deformation ◽  
Advantages And Disadvantages ◽  
Economic Context ◽  
Circular Profile ◽  
Steel Aisi ◽  
Current Guidelines

The economic context and the current guidelines of research and achievement of complex profiles are focussed on choosing that process which leads to obtaining high quality pieces with minimum costs. Circular grooves are complex surfaces often encountered on pieces in machine construction. They can be processed either by cutting or by cold plastic deformation. This paper presents by comparison a series of characteristics of a circular profile obtained by two different processes: profiled turning with radial feed and cold rolling with two wedge tools. The characteristics analysed refer to the roughness of the profile obtained, the microstructure and micro-hardness of the superficial layer generated. In the experiments two types of materials with different compositions and properties were used: cementing steel AISI 1015 and improving steel AISI 5140, usually used for the construction of pieces with circular grooves. Processing by rolling was performed with two types of wedges: with a long area of deformation and low slope angle and with a short area of deformation and high slope angle. The results of the study allow establishing the conditions to apply each one of the two processes analysed, highlighting their advantages and disadvantages, as it results from the comparison of the characteristics of the profile obtained.

Airtightness of Buildings in Slovakia

2013 ◽  
Vol 649 ◽  
pp. 3-6 ◽  
Author(s):  
Dušan Katunský ◽  
Maros Nemec ◽  
Martin Kamenský
Keyword(s):  
Energy Savings ◽  
Slovak Republic ◽  
Point Of View ◽  
Building Envelopes ◽  
Energy Demands ◽  
Energy Economy ◽  
Materials Used ◽  
Selection Of ◽  
Made In

The actual trend of civil engineering leads to quality improving of housing and to saving of all participated energies. Airtightness of buildings´ envelope constructions has an important job in the point of view of energy savings and energy economy. Undesirable air flow occurs through joints, cracks and leaks in building envelopes. It has a significant influence to final quality of an indoor environment and energy demands and needs of warmth for heating resulting from it. The paper presents results of chosen airtightness measurements made in family and apartment buildings in the Slovak Republic, the achieved level of airtightness by various construction systems and outer walls, as well as which impact for air changes has location and selection of materials used for airtightness layer in the construction of outer walls at pressure difference of 50 Pa (n50).

scholarly journals Application of blood plasma enriched with platelet derived growth factors in experimental perforation of the tympanic membrane

2019 ◽  
pp. 108-114 ◽  
Author(s):  
A. V. Gurov ◽  
A. V. El’chaninov ◽  
Z. V. Murzakhanova
Keyword(s):  
Growth Factors ◽  
Blood Plasma ◽  
Tympanic Membrane ◽  
Middle Ear ◽  
Point Of View ◽  
Extensive Experience ◽  
Extracellular Matrix Components ◽  
Materials Used ◽  
Acute Perforation

Acute traumatic perforation of the tympanic membrane occupies a significant place in the structure of the pathology of the middle ear, since «persistent» perforation of the tympanic membrane is the main cause of chronic inflammation in the middle ear, leading to hearing loss and reducing the quality of life of patients. «Persistent» perforation of the tympanic membrane, according to various authors, is formed in 84-392 cases per 10,000 population, so restoring the integrity of the damaged tympanic membrane is one of the main tasks of reconstructive otosurgery. Most authors are of the opinion that it is advisable to close the traumatic eardrum defect early. To date, many ways to close it have been developed. In modern otorhinolaryngology there is extensive experience in using various methods of myringoplasty using various materials for traumatic perforation of the tympanic membrane. However, such a wide variety of plastic techniques and the variety of materials used for this indicates an unresolved problem of closing the perforation of the tympanic membrane. To date, many works have been published that confirm the effectiveness of the use of blood plasma enriched with platelet growth factors in plastic surgery, cosmetology, traumatology, and dentistry. The result of exposure to blood plasma enriched with growth factors is the expression of proteins that regulate chemotaxis, adhesion, cell proliferation, angiogenesis, cell differentiation and the synthesis of extracellular matrix components. Blood plasma enriched with growth factors is autologous (biocompatible), safe from the point of view of the transfer of infectious pathogens. Thus, it can be assumed that the use of plasma enriched with growth factors during surgery during closure of acute perforation of the tympanic membrane will lead to accelerated tissue regeneration and, consequently, a reduction in the length of the postoperative period, and improved treatment outcomes. The use of this method is possible even in a day hospital.

scholarly journals Chondroitin sodium sulfate – impurities and standardization problems (literature review)

2019 ◽  
Vol 18 (1) ◽  
pp. 25-36
Author(s):  
Е. L. Komarova ◽  
S. V. Chernova ◽  
K. V. Kasumova ◽  
M. S. Tabachnaya ◽  
L. V. Оvsyannikova ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Comparative Analysis ◽  
Chemical Compounds ◽  
Animal Tissue ◽  
Point Of View ◽  
Raw Material ◽  
Technological Processing ◽  
Normative Documentation ◽  
Degree Of Purification

Modern research in the field of chondroitin sulfate chemical composition is considered. Clinical efficiency and safety are shown to depend on the nature and quality of the raw material used, ways of its technological processing and the degree of purification. The composition of chemical compounds (CC) variable is stated to represent the mixture of 2 main isomeric forms: chondroitin 4-sulfate and chondroitin 6-sulfate. In the animal tissue chondroitin 4-sulfate dominates, the content of which is 70 %; the content of chondroitin 6-sulfate is 30 %. The cartilages of sharks and other hydrobionts have got low content of chondroitin 4-sulfate (10 %) and chondroitin 6-sulfate 80 %. Complex polymeric structure and instability of CC composition make the problem of drug standardization on its basis complicated. The impurities encountered in substances are considered. The impurities are divided into several groups: related impurities, technological or mechanical ones uncharacteristic of CC. Comparative analysis of requirements for raw material from the point of view of normative documentation of different countries is carried out and their considerable difference is detected. It has been shown that for raising pharmacological activity the producer of drugs must take into account all the parameters of CC including the structural composition, molecular weight and presence of impurities.

scholarly journals Environmental quality of marginal territories using comparative analysis of fluctuating asymmetry methods and determining the area of leaf damage

2020 ◽  
Vol 210 ◽  
pp. 02009
Author(s):  
Aleksander Lugovskoy ◽  
Sergey Gildenskiold ◽  
Tatjana Krylova ◽  
Nina Fomina
Keyword(s):  
Comparative Analysis ◽  
Fluctuating Asymmetry ◽  
Life Support ◽  
Point Of View ◽  
Leaf Damage ◽  
Territorial Development ◽  
Leisure Facilities ◽  
Favorable Conditions ◽  
And Control

The paper assess marginal and control territories within the Moscow Metropolitan area using a comparative analysis of fluctuating asymmetry method and determining the area of leaf damage to obtain a comprehensive assessment of the territory from the point of view of human habitation with minimal comfort parameters within the sensitivity of plants. The results of the combined analysis of two methods are obtained, which confirm the possibility of their use and the representativeness of the results obtained in assessing the comfort of the environment. The assessment of the quality of the environment in marginal territories was made by quantitative and qualitative indicators for the rational use of land resources, their involvement in economic turnover with the creation of favorable conditions for ensuring the flow of social processes of territorial development and comfortable life support of the population. It was proposed that socially-oriented infrastructure, leisure facilities, and social and cultural facilities have been formed in these territories with a sufficiently large and diverse number of types and forms of employment for the population, which should become the basis for the development of marginal territories.

Comparative Analysis of the Physical and Mechanical Properties of Composites with Functional Fillers Based on Waste

2021 ◽  
Vol 410 ◽  
pp. 668-673
Author(s):  
Vyacheslav V. Barakhtenko ◽  
Tatiana H. Sahabutdinova ◽  
Yury V. Novikov
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Industrial Waste ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Point Of View ◽  
Metallic Materials ◽  
Materials Used ◽  
Functional Fillers ◽  
Properties Of Composites

The article is devoted to research in the development of composite materials based on polyvinyl chloride and industrial waste from the metallurgical, energy and mining industries. The properties of dispersed waste have been studied, which make it possible to speak of the possibility of their use as fillers for polymer compositions. A comparative analysis of the tested physical and mechanical properties is carried out, depending on the characteristics of the particle size of the fillers. It was revealed that from the point of view of construction materials, all the wastes under study can be used as fillers. The development will make it possible to dispose of industrial waste to obtain useful products and save natural non-metallic materials used in the creation of composites.

scholarly journals Obtaining a Functional Product Through the Exploitation of Mushroom Flour in Pasta

2017 ◽  
Vol 74 (1) ◽  
pp. 17 ◽  
Author(s):  
Crina Carmen MURESAN ◽  
Anca FARCAS ◽  
Simona MAN ◽  
Ramona SUHAROSCHI ◽  
Romina Alina VLAIC
Keyword(s):  
Antioxidant Activity ◽  
Nutritional Value ◽  
Raw Materials ◽  
Point Of View ◽  
Biologically Active ◽  
Total Polyphenols ◽  
Organoleptic Characteristics ◽  
Functional Product ◽  
Materials Used

The present study focuses on the influence of adding mushroom powder on a certain assortment of pasta. The research comprises two major directions: the study of the raw materials used to produce pasta from a compositional point of view and the quantification of some biologically active compounds of interest; emphasizing the potential of using Boletus edulis mushroom powder in the composition of pasta and evaluating the quality of the product from a nutritional and sensorial point of view. For this purpose, two types of pasta have been created, with different percentages of mushroom, 10% and 20%, but also a blank sample obtained in the same conditions, but without mushroom powder. To achieve the goal the following analyzes were conducted: proteins, total polyphenols, antioxidant activity, fat, humidity, ashes, acidity, increase in volume of the boiled pasta and customers’ preferences.By using sensory analysis has been established that the consumers preferred pasta enriched with 10% mushroom powder. In conclusion, the addition of mushrooms flour assures an enhancement of the nutritional value, as well as of the organoleptic characteristics of the final product.

scholarly journals Comparative Analysis of the Importance of the Requirements of Passengers and Evaluating the Quality of Air and Bus Transport

2018 ◽  
Vol 236 ◽  
pp. 02006
Author(s):  
Vladimír Konečný ◽  
Róbert Berežný ◽  
Mária Kostolná ◽  
Pavel Šaradín
Keyword(s):  
Comparative Analysis ◽  
Quality Assessment ◽  
Quality Criteria ◽  
Point Of View ◽  
Individual Quality ◽  
Customer Requirements ◽  
Mode Of Transport ◽  
Bus Services ◽  
Bus Transport

The paper deals with the comparison of the importance of passengers’ requirements for the quality of the services provided and the quality assessment of air and bus transport. Individual quality criteria and their importance from the point of view of passengers vary depending on the mode of transport. It is also possible to observe the differing importance of quality criteria in relation to groups of passengers. The paper is processed comparison of the importance of individual quality criteria in air and bus services to the research in this area. In the paper is processed IPA matrix for air and bus transport. These are simple matrices that serve to highlight and understand important customer requirements.

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