ANALYSIS OF PROPERTIES AND STRUCTURE CHANGE PROCESS SAMPLES MATERIAL UNDER EXPOSURE ULTRASONIC STABILIZATION

2021 ◽  
Vol 1 (142) ◽  
pp. 124-130
Author(s):  
Timur A. Baltaev ◽  
◽  
Roza I. Dzhusupkalieva ◽  
Anna Z. Sagynalieva ◽  
◽  
...  
Keyword(s):  
Ultrasonic Treatment ◽  
Negative Impact ◽  
Mechanical Vibration ◽  
Sharp Decrease ◽  
Correct Choice ◽  
Research Purpose ◽  
Sample Material ◽  
Round Plate ◽  
Cyclic Action ◽  
Micro Cracks

The most important task of precision engineering on the modern stage is the development of effective technological processes of manufacturing, providing not only achieving high precision at low costs, but also retaining the original in terms of accuracy throughout the life of the product. (Research purpose) The research purpose is in studying the possible negative effect of ultrasonic mechanical vibration in the process of stabilizing the deformation of circular plates on the subject of appearing of various kinds of micro-cracks, which result will be a sharp decrease in resource products in general, and to make a comparative analysis of changes in the properties and structure of the material. (Materials and methods) Half of the prepared samples were processed using a thermomechanical technology based on the cyclic action of a liquid or gas in different temperature conditions, the other part of the samples was processed using the proposed technology based on the method of ultrasonic mechanical action. The end section of the round plate for both processing options was prepared. (Results and discussion) In the structure of the material of both the samples treated by different methods, there are certain bundles of the micro-cracks type caused by plastic impact. The structure of sample material processed by standard method is more rough, the concentration of microcracks in the material of the sample treated by ultrasonic impact does not exceed the concentration of microcracks of the sample material processed in a standard way. (Conclusions) Changing the structure of the material of the round plate after ultrasonic treatment may not have a negative impact and does not affect the durability of the product during operation. With the correct choice of the ultrasonic treatment mode, a more uniform stress reduction can be achieved during the processing, and the quality and efficiency of the process can be improved. Ultrasonic processing increases the mechanical characteristics of the material, such as tensile strength and proportionality.

ANALYSIS OF PROPERTIES AND STRUCTURE CHANGE PROCESS SAMPLES MATERIAL UNDER EXPOSURE ULTRASONIC STABILIZATION

2021 ◽  
Vol 1 (142) ◽  
pp. 124-130
Author(s):  
Timur Baltaev ◽  
◽  
Roza Dzhusupkalieva ◽  
Anna Sagynalieva ◽  
◽  
...  
Keyword(s):  
Ultrasonic Treatment ◽  
Negative Impact ◽  
Mechanical Vibration ◽  
Sharp Decrease ◽  
Correct Choice ◽  
Research Purpose ◽  
Sample Material ◽  
Round Plate ◽  
Cyclic Action ◽  
Micro Cracks

The most important task of precision engineering on the modern stage is the development of effective technological processes of manufacturing, providing not only achieving high precision at low costs, but also retaining the original in terms of accuracy throughout the life of the product. (Research purpose) The research purpose is in studying the possible negative effect of ultrasonic mechanical vibration in the process of stabilizing the deformation of circular plates on the subject of appearing of various kinds of micro-cracks, which result will be a sharp decrease in resource products in general, and to make a comparative analysis of changes in the properties and structure of the material. (Materials and methods) Half of the prepared samples were processed using a thermomechanical technology based on the cyclic action of a liquid or gas in different temperature conditions, the other part of the samples was processed using the proposed technology based on the method of ultrasonic mechanical action. The end section of the round plate for both processing options was prepared. (Results and discussion) In the structure of the material of both the samples treated by different methods, there are certain bundles of the micro-cracks type caused by plastic impact. The structure of sample material processed by standard method is more rough, the concentration of microcracks in the material of the sample treated by ultrasonic impact does not exceed the concentration of microcracks of the sample material processed in a standard way. (Conclusions) Changing the structure of the material of the round plate after ultrasonic treatment may not have a negative impact and does not affect the durability of the product during operation. With the correct choice of the ultrasonic treatment mode, a more uniform stress reduction can be achieved during the processing, and the quality and efficiency of the process can be improved. Ultrasonic processing increases the mechanical characteristics of the material, such as tensile strength and proportionality.

scholarly journals Investigation Into Effect Of Crude Mixture Of Abrus Precatorius Seed On Hypothalamopituitary Gonadal Axis And Development Of Antifertility In Male Rats

1970 ◽  
Vol 36 (1) ◽  
pp. 103-109 ◽  
Author(s):  
S Talukder ◽  
MA Hossain ◽  
S Sarker ◽  
MAH Khan
Keyword(s):  
Negative Impact ◽  
Sperm Count ◽  
Sharp Decrease ◽  
Serum Levels ◽  
Serum Biochemistry ◽  
Male Rats ◽  
Male Rat ◽  
Control Group ◽  
Abrus Precatorius ◽  
Crude Mixture

To evaluate the antifertility effect of crude mixture of A. precatorius seeds at the dose level of 50 mg/kg body weight in adult male rats, after oral administration to male rats for 40 days, the rats were sacrificed and hormonal profiles, serum biochemistry, sperm count and histological changes were recorded. A sharp decrease in the serum levels of testosterone (0.70 ± 0.17 ng/ml), FSH (0.70 ± 0.22 lU/L), and LH (0.87 ± 0.35 IU/L) was detected compared to control (FSH, LH and testosterone levels 0.93 ± 0.15 ng/ml, 0.76 ± 0.28 IU/L, 1.44 ± .011 IU/L, respectively). A significant reduction of epididymal sperm count (2.34 million/mL) was noted in treated rats as compared to control group (7.87 million/mL). Histology of testes showed marked atrophy of the testes, which was characterized by disruption of the seminiferous epithelium and atrophy of the Leydig cells. Crude mixture of A. precatorius seed has a negative impact on male reproductive functions. It might be suggested that crude mixture of A. precatorius seeds might have antifertility property for male rats.   Keywords: Abrus precatorius; antifertility; male rat; testosterone. DOI: http://dx.doi.org/10.3329/bjar.v36i1.9234 BJAR 2011; 36(1): 103-109

scholarly journals The COVID-19 Shock and Consumer Credit: Evidence from Credit Card Data

2021 ◽  
Vol 2021 (008) ◽  
pp. 1-55
Author(s):  
Akos Horvath ◽  
◽  
Benjamin Kay ◽  
Carlo Wix ◽  
◽  
...  
Keyword(s):  
Interest Rates ◽  
Credit Card ◽  
Negative Impact ◽  
Consumer Credit ◽  
Credit Cards ◽  
Sharp Decrease ◽  
Main Driver ◽  
Credit Card Data ◽  
Pandemic Severity ◽  
The Impact

We use credit card data from the Federal Reserve Board's FR Y-14M reports to study the impact of the COVID-19 shock on the use and availability of consumer credit across borrower types from March through August 2020. We document an initial sharp decrease in credit card transactions and outstanding balances in March and April. While spending starts to recover by May, especially for risky borrowers, balances remain depressed overall. We find a strong negative impact of local pandemic severity on credit use, which becomes smaller over time, consistent with pandemic fatigue. Restrictive public health interventions also negatively affect credit use, but the pandemic itself is the main driver. We further document a large reduction in credit card originations, especially to risky borrowers. Consistent with a tightening of credit supply and a flight-to-safety response of banks, we find an increase in interest rates of newly issued credit cards to less creditworthy borrowers.

scholarly journals Chronological trends in maximum and minimum water flows of the Teesta River, Bangladesh, and its implications

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Md. Sanaul H. Mondal ◽  
Md. Serajul Islam
Keyword(s):  
Negative Impact ◽  
Risk Mitigation ◽  
Flow Characteristics ◽  
Sharp Decrease ◽  
Water Levels ◽  
Mitigation Strategies ◽  
Low Flow ◽  
Risk Mitigation Strategies ◽  
Major River ◽  
Water Justice

Bangladesh shares a common border with India in the west, north and east and with Myanmar in the southeast. These borders cut across 57 rivers that discharge through Bangladesh into the Bay of Bengal in the south. The upstream courses of these rivers traverse India, China, Nepal and Bhutan. Transboundary flows are the important sources of water resources in Bangladesh. Among the 57 transboundary rivers, the Teesta is the fourth major river in Bangladesh after the Ganges, the Brahmaputra and the Meghna and Bangladesh occupies about 2071 km2 . The Teesta River floodplain in Bangladesh accounts for 14% of the total cropped area and 9.15 million people of the country. The objective of this study was to investigate trends in both maximum and minimum water flow at Kaunia and Dalia stations for the Teesta River and the coping strategies developed by the communities to adjust with uncertain flood situations. The flow characteristics of the Teesta were analysed by calculating monthly maximum and minimum water levels and discharges from 1985 to 2006. Discharge of the Teesta over the last 22 years has been decreasing. Extreme low-flow conditions were likely to occur more frequently after the implementation of the Gozoldoba Barrage by India. However, a very sharp decrease in peak flows was also observed albeit unexpected high discharge in 1988, 1989, 1991, 1997, 1999 and 2004 with some in between April and October. Onrush of water causes frequent flash floods, whereas decreasing flow leaves the areas dependent on the Teesta vulnerable to droughts. Both these extreme situations had a negative impact on the lives and livelihoods of people dependent on the Teesta. Over the years, people have developed several risk mitigation strategies to adjust with both natural and anthropogenic flood situations. This article proposed the concept of ‘MAXIN (maximum and minimum) flows’ for river water justice for riparian land.

scholarly journals The Identification of Sustainable Supply Chain Elements in The Enterprise X

2013 ◽  
Vol 5 (1) ◽  
pp. 23-27
Author(s):  
Paula Bajdor
Keyword(s):  
Economic Development ◽  
Supply Chain ◽  
Supply Chains ◽  
Social Environment ◽  
Natural Environment ◽  
Negative Impact ◽  
Research Purpose ◽  
Sustainable Supply Chain ◽  
Green Supply Chains ◽  
Further Development

Abstract Today, operating on the market, enterprises, to a lesser or greater extent, try to carry out their activities in such a way to minimize the possible negative impact on the environment. In most companies, the analysis of its supply chains can identify them as "green supply chains", which primarily involves not harming the natural environment. However, the further development of this concept is "sustainable supply chain", the chain that means not only protection of the environment but also means caring for the closest social environment together with economic development of the company. As opposed to green supply chains, it is still difficult to identify a sustainable supply chain in Polish enterprises. For the research purpose, the interview sheet has been created, based on the answers provided by the companies it is possible to further identify and determine the elements that make up a sustainable supply chain. This article presents an interview sheet with the answers given by one of the companies investigated

scholarly journals Development of Algorithms and Software Systems for Motion Control of a Robotic Tillage Unit

2019 ◽  
Vol 13 (2) ◽  
pp. 48-52 ◽  
Author(s):  
Yakov P. Lobachevsky ◽  
Sergey E. Lonin ◽  
Ilya S. Alekseev ◽  
Nikolay T. Goncharov ◽  
Irina I. Afonina ◽  
...  
Keyword(s):  
Motion Control ◽  
Labor Productivity ◽  
Crop Yields ◽  
Negative Impact ◽  
Weather Conditions ◽  
Field Work ◽  
Soil Tillage ◽  
Research Purpose ◽  
Software Systems ◽  
Random Factor

Abstract. Automation of agricultural machinery is aimed at solving specific practical tasks: control and maintenance of the technological process quality, increasing labor productivity as well as crop yields. The method of "precision farming" is economically expedient, since it is a direct saving of technological material, as well as it helps reducing the negative impact on the environment and farm produce. (Research purpose) The research purpose is to review and analyze the main aspects required to develop the algorithms and software for motion control systems for a robotic tillage unit. (Materials and methods) To implement process control, it is necessary to control the direction of travel along a specified path, change the speed of movement depending on the engine load, switching the transmission gears. Physical-and-mechanical characteristics of the unit are rather heterogeneous and depend on weather conditions. Therefore, the algorithm for controlling the power of the robotic mobile unit must take into account, as much as possible, variations in the external effects of drawbar properties and the motion resistance, as a random factor. (Results and discussion) The authors have developed an imitation model representing the movement of a robotic unit. For the simulation, use has been made of a cyclic trajectory of the unit movement, consisting of two types of sections: the rectilinear ones reflecting the soil tillage pattern, and the turn areas where the unit makes a turn along a curvilinear trajectory around a certain center. (Conclusions) The implementation of robotic technologies in agricultural production result in increased technical, technological, production and economic indicators of agricultural units in field work, increased labor productivity, reduced time required for fieldworks, more rational use of bioenergy resources, increased yields of agricultural crops and reduced environmental impacts.

Improving the human-machine-environment monitoring system and operation rules for increasing operational tractor reliability

2020 ◽  
pp. 12-20
Author(s):  
Nikolay A. Petrishchev ◽  
Mikhail N. Kostomakhin ◽  
Aleksandr S. Sayapin ◽  
Irina B. Ivleva
Keyword(s):  
Human Factor ◽  
Negative Impact ◽  
Operational Reliability ◽  
Operating Costs ◽  
Research Purpose ◽  
Environment Monitoring ◽  
Operating Rules ◽  
Operation Rules ◽  
Subjective Assessments ◽  
Operational Factors

During fieldwork, machines and technical personnel work almost to the limit of their capabilities, while there is an urgent need for comprehensive monitoring of the interaction of the "Human-machine-environment" system and the operating rules for improving the operational reliability of tractors. (Research purpose) The research purpose is in developing a prototype of an electronic digital system that will help the operator to control changes in operational factors for improving the reliability of the entrusted equipment. (Materials and methods) The article presents conducted research on the use of the Galileo Sky+ terminal, which works together with additional programmable contactless sensors. This made it possible improving the system for increasing operational reliability. (Results and discussion) The article present examples and describes the accounting process for the human factor in the Human-machine-environment system. Authors have found that using the monitoring helps the operator and owner in reducing the share of subjective assessments in the efficiency of tractor operation and the readiness to work. (Conclusion) Using the proposed solutions for improving monitoring of the "Human-machine-environment" system will minimize the negative impact and risks of failures caused by the human factor in the operation of equipment. According to preliminary expert estimates, the efficiency of using the system will reduce operating costs and prevent gross errors in the operation of tractors.

scholarly journals Noise Control Transmission Methods of the Combustion Engine by Means of Reduction of the Vibration

2016 ◽  
Vol 41 (2) ◽  
pp. 277-284 ◽  
Author(s):  
Stanislav Žiaran ◽  
Ondrej Chlebo
Keyword(s):  
Prolonged Exposure ◽  
Negative Impact ◽  
Combustion Engine ◽  
Mechanical Vibration ◽  
Low Frequency ◽  
Driving Safety ◽  
Vehicle Body ◽  
Frequency Noise ◽  
Passenger Vehicle ◽  
Low Frequency Waves

Abstract Transmission of vibroacoustic energy from an internal combustion engine (ICE) to its surroundings largely depends on how it is mounted, on available transmission paths and on the construction of the vehicle body and/or its surrounding structures. This is especially true in low speed engines in enclosed areas which generate perceptually weak noise, but strong low-frequency waves which energy has a negative impact on human health, comfort and driving safety especially in prolonged exposure to the source. The primary aim of the article was to analyse components of the ICE unit which had a determining impact on the reduction of low-frequency waves. Thus, the structurally transmitted noise from the ICE to its surrounding structure (body of the passenger vehicle) was analysed. The results of the vibroacoustic measurements were compared to modal analysis in order to determine possible resonance sources in the vehicle body and/or for assessing the influence of the vehicles safety gear on the generated vibroacoustic energy transfer into the cabin area of the passenger vehicle. Measurements were made for a passenger vehicle at rest and operating in its most common operational speed as well as for the stationary ICE of a cogenerate unit (CGU). Measurements and FFT analysis were used for the detection of the vibroacoustic energy sound pressure level (noise) and mechanical vibration. Firstly, the low-frequency noise sources were determined and their direct effects on the human body were investigated. Finally, this paper suggests some measures which may contribute to the reduction of undesirable vibroacoustic energy in enclosed areas.

scholarly journals Preventive Efforts of Parents in Preventing Juvenile Delinquency

2016 ◽  
Vol 3 (2) ◽  
pp. 123-126
Author(s):  
Danis Feny Suwella ◽  
Sri Mugianti ◽  
Triana Setijaningsih ◽  
Suprajitno Suprajitno
Keyword(s):  
Juvenile Delinquency ◽  
Data Collection ◽  
Research Design ◽  
Negative Impact ◽  
Research Purpose ◽  
Survey Results ◽  
Quota Sampling

The research purpose was to describe the preventive efforts of parents in preventing juveniledelinquency. The research design was descriptive and the data was collected with a questionnaire. Thepopulation was 251 parents. The sample was 38 respondents taken by using quota sampling technique.The data collection was conducted in March-April 2015. The survey results revealed that the preventiveefforts of the parents in preventing juvenile delinquency by 84.2% (32 people) in a good category,13.2% (5 people) in a sufficient category and 2.6% (1 person) in a bad category. Preventive efforts inbad category were in a small percentage, but it would have a negative impact if not being handled.Based on the results of the research, it is expected that school provides socialization to the parentsabout the prevention of juvenile delinquency and make a good cooperation in preventing juveniledelinquency.Keywords: Preventive efforts

scholarly journals Ultrasonic intensification of hydrogen sulphide removal from fuel oil

2020 ◽  
Vol 2020 (2) ◽  
pp. 27-32
Author(s):  
Nadezhda Anatolievna Pivovarova ◽  
Ekaterina Sergeevna Akishina ◽  
Marina Vyacheslavovna Ryzhova ◽  
Galina Vladimirovna Vlasova
Keyword(s):  
Hydrogen Sulfide ◽  
Ultrasonic Treatment ◽  
Negative Impact ◽  
Fuel Oil ◽  
Alternative Methods ◽  
Sulfide Removal ◽  
Relevant Today ◽  
Hydrogen Sulfide Removal ◽  
Ultrasonic Intensification ◽  
Hydrogen Sulfide Content

The article considers the problem of environmental pollution caused by the presence of hydrogen sulfide in fuel oil. Hydrogen sulfide has a negative impact on the human health: a slight degree of poisoning develops within 3-4 hours already at a 100 mg/m3 concentration of hydrogen sulfide in the air. The regulatory documents limit the hydrogen sulfide content in fuel oil. The search for new available methods of cleaning fuel oil from hydrogen sulfide is relevant today. There has been considered one of the alternative methods of hydrogen sulfide removal from fuel oil, namely, ultrasonic treatment. The method allows changing the dispersed composition of fuel oil and intensifying the extraction of the gas phase of hydrogen sulfide. The advantages of ultrasonic treatment include the absence of injected reagents and environmental cleanliness, small size, low energy costs and the possibility of using ultrasound unit at existing refineries due to its compactness. The influence of the ultrasonic unit capacity and flow rate on hydrogen sulfide removal from fuel oil and change of its dispersion composition has been studied. There have been presented the optimal conditions for ultrasonic treatment and described the mechanism of hydrogen sulfide removal by using ultrasonic treatment

Sign in / Sign up

Export Citation Format

Share Document