ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference最新文献

{"title":"STUDY OF THE STATE OF INNOVATION DEVELOPMENT AND OBSOLESCENCE IN THE REPUBLIC OF BULGARIA OF COMPANIES FROM THE MECHANICAL ENGINEERING SECTOR","authors":"D. Petrova, Beata Vlahova, A. Lengerov, Tsanka Zlateva-Petkova","doi":"10.17770/etr2023vol1.7239","DOIUrl":"https://doi.org/10.17770/etr2023vol1.7239","url":null,"abstract":"The goal is to make an analytical study of the state of innovation development and innovation obsolescence in 15 machine-building companies in the Republic of Bulgaria. On this basis, the regularity of innovation obsolescence should be established and whether it has priority over physical wear and tear. An alternative approach for choosing solutions to reduce the harmful impact of rapid innovation obsolescence is proposed. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133198700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTICAL SYSTEMS FOR REDUCING THE DIVERGENCE OF LASER BEAMS","authors":"D. Pulov, P. Tsvyatkov","doi":"10.17770/etr2023vol3.7217","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7217","url":null,"abstract":"The rational use of lasers as sources of radiation is also related to the development of optical systems for conversion of laser radiation. One of the ways to convert the laser radiation is related to its collimation, changing the cross-section and changing the divergence. This article presents a methodology for designing two component optical systems to reduce the divergence of laser beams.  Ready-made optical elements were used, with which three different configurations were created and analyzed. The optical design  was developed and subsequent optimization was performed. The resulting system has diffraction-limited quality of the outgoing laser beam and small dimensions.","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133796882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTICAL GEOMETRIC DESIGN OF SMALL MODULAR CYLINDRICAL GEARS WITH ASYMMETRIC PROFILE","authors":"G. Cvetanov, T. Karadzhov","doi":"10.17770/etr2023vol3.7279","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7279","url":null,"abstract":"The article presents specific practical solutions for optimal geometric design of evolvental cylindrical gears with an asymmetric profile of cogs in the context of the basic principle of cog interlocking. In order to achieve unknown until now quality indicators, constructions with a minimum number of cogs and a maximum angle of interlocking are shown, which allow for the production of off-polar gears and significantly increase the gear ratio of the differential and planetary mechanisms. In the process of determining the geometrical parameters of the cogwheels of the gear, the “classical approach” is used by analogy with the parameters of the instrument, necessary for the production of the small-module cogwheels of the gear.","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114485345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SOLVING FUNCTIONAL-TECHNOLOGICAL PROBLEMS USING A NON-PARAMETRIC APPROACH FOR CONTROL OF MICROGEOMETRY OF THE SURFACES OF DETAILS","authors":"Dimilyan Leonov, H. Metev, K. Krumov, A. Lengerov","doi":"10.17770/etr2023vol3.7230","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7230","url":null,"abstract":"In the article considers the effect of surface roughness on the functioning of a specific mechanism. In case of proven dependence of the studied functional property of surface microgeometry, a process of optimization of the sought parameter is carried out, in which the methods of mathematical analysis and theoretic foundations of technology of appliance and mechanical engineering are used for the basis of the theoretical studies. As control parameters of the specified optimal microgeometry, deciding the given task, the so-called non-parametric criteria are used, namely graphical of certain surface-profile functions.","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116298480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CHARACTERISTICS OF MOVEMENTS WHEN CYLINDRICAL TURNING, DRILLING, COREDRILLING AND REAMING","authors":"Angel Poparov, Agop Izmirliqn","doi":"10.17770/etr2023vol3.7259","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7259","url":null,"abstract":"In the process of work the tool angles change their value to become the working angles. This results in a variation of the work conditions of the cutting tools. The variation depends on the characteristic of the resultant cutting motion – the sum of the cutting motion and feed motion.In this article the characteristics of motions of cylindrical turning, drilling, coredrilling and reaming are derived, which can serve as a basis for determining the relations between the tool and working angles. These relations can be used in programming the CNC to prevent the formation of negative working clearance angle and the destruction of the tool. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126974369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVESTIGATING THE IMPACT OF LASER POWER AND SCAN SPEED ON ENGRAVING ASPEN THERMOWOOD","authors":"Dzintars Rāviņš, E. Hristov Yankov, I. Adijāns, L. Lazov, Daivis Rāviņš","doi":"10.17770/etr2023vol3.7250","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7250","url":null,"abstract":"This study examines the effect of pre-heat treatment on laser engraving of aspen thermowood. We used an infrared CO2 laser with a wavelength of 10640 nm to engrave aspen thermowood samples with different pre-treatment temperatures, including one non-treated sample (base). The samples had a similar moisture content of about 6 - 8%, but exhibited different shades of brown depending on the pre-treatment temperature. The engraving depth and width were measured for each sample, and 8 graphs were constructed to analyze the results. Our findings show that pre-treatment temperature has a significant effect on the efficiency of laser engraving, with higher pre-treatment temperatures resulting in deeper engraving lines. The study provides valuable insights into the optimization of laser engraving parameters for aspen thermowood, and demonstrates the potential of pre-heat treatment to improve the quality of laser-engraved wooden products. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124856590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DIDACTIC POTENTIAL OF HUMANITIES IN DEVELOPING TRANSFORMATIVE COMPETENCIES AMONG COMPUTER ENGINEERING AND INFORMATION TECHNOLOGY UNDERGRADUATES","authors":"O. Malykhin, N. Aristova, Tetyana Opaliuk","doi":"10.17770/etr2023vol2.7227","DOIUrl":"https://doi.org/10.17770/etr2023vol2.7227","url":null,"abstract":"In the recent decades harnessing the advanced information technologies and their tremendous potential to improve the quality of life for people all over the world is becoming an urgent need than a luxury. Knowing full well that as an innovative student-centred learning paradigm Education 4.0 creates favourable prerequisites for developing valuable professional skills, abilities and knowledge among Computer Engineering and Information Technology undergraduates, the researchers assumed that it also might be effective in preparing them for challenges of the contemporary world through developing their transformative competencies while studying the humanities. The paper aims to reveal the didactic potential of humanities for developing Computer Engineering and Information Technology undergraduates’ transformative competencies. The researchers carried out an exploratory study in five Ukrainian universities using an online survey conceived and developed by a team of researchers. A total of 275 respondents selected by means of a purposeful sampling method took part in the survey. The study found that humanities (1) are more likely to apply various learning activities which can be done both individually and in groups than technical disciplines and (2) have much broader potential for developing all key constructs of transformative competencies among Computer Engineering and Information Technology undergraduates than technical disciplines. The results enabled the researchers to formulate recommendations for university teachers of humanities on how to develop transformative competences among Computer Engineering and Information Technology undergraduates. The combination of challenge-based learning (CBL) and activity-based learning (ABL) is being considered as a major methodological approach of Education 4.0 for developing transformative competences among Computer Engineering and Information Technology undergraduates. Scientific novelty of research consists in revealing and describing the didactic potential of humanities for developing Computer Engineering and Information Technology undergraduates’ transformative competencies. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125093428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDY OF THE INFLUENCE OF ROAD RESISTANCE ON THE FUEL CONSUMPTION OF A PASSENGER CAR WITH AN AUTOMATIC TRANSMISSION","authors":"K. Ambarev, S. Taneva","doi":"10.17770/etr2023vol3.7273","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7273","url":null,"abstract":"One of the directions in the modern automotive industry is related to optimizing processes of the working cycle of internal combustion engines, which is related on another hand to reducing fuel consumption. This article presents calculation results of fuel consumption of a passenger car Honda Accord with automatic gearbox which are based on experimentally obtained power characteristics by using a chassis dynamometer DYNO COSBER. The fuel consumption was determined at different speeds of the car on a road without a slope and with 2%, 4% and 6% slope by using the chassis dynamometer and diagnostic equipment. The results of calculations about the influence of road resistances on fuel consumption were compared and analyzed with those obtained from measurements.","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121693953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PRODUCT MARKET EXPANSION STRATEGY FOR BUSINESS DEVELOPMENT OF THE COMPANIES OPERATING IN THE FIELD OF PREMISES CLEANING","authors":"R. Zvirgzdiņa, Dace Šakena, Iveta Linina","doi":"10.17770/etr2023vol1.7209","DOIUrl":"https://doi.org/10.17770/etr2023vol1.7209","url":null,"abstract":"The long-term strategic development of cleaning companies cannot be implemented by providing only one type of service - cleaning of premises.Within this research the author studied the theoretical aspects of corporate strategies, product market expansion strategy for business development of the cleaning companies, to understand the industry of cleaning of premises and challenges of that industry.A monographic and descriptive method was used to analyze the theoretical aspects of company strategies, secondary data analysis and expert interview were used to describe the situation of premises cleaning industry, but quantitative research method such as analyzing of statistical data of the cleaning of premises companies, in connection with the comparative, analytical, deductive, logical approach method was used in this research.The research identifies factors that the expansion of the range of services is relevant in every business and every industry, because every industry develops over time, new regulations are adopted that can affect the respective industry, which means that companies are constantly forced to adapt to changing business, economic and political conditions.The research finds that if the company has successfully developed, has found its market share, and is working with good results, this does not mean that the company can relax and not think about its development.  ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125474070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF NI AS MINORITY ALLOYING ELEMENT ON THE CORROSION BEHAVIOR OF AMORPHOUS AL-CU-MG ALLOYS IN CHLORIDE SOLUTION","authors":"V. Dyakova, Y. Kostova, Hristina Spasova","doi":"10.17770/etr2023vol3.7201","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7201","url":null,"abstract":"The influence of nickel as minority alloying element on the corrosion behavior of amorphous alloys (Al74Cu16Mg10)99Ni, (Al74Cu16Mg10)98Ni2 and (Al74Cu16Mg10)97Ni3 was investigated. The amorphous alloys were obtained as ribbons by Chill Block Melt Spinning (CBMS). The amorphous structure of the alloys was proven by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The corrosion rate was calculated gravimetric using continuous immersion tests for 360 hours in 3.5% NaCl solution at a temperature of 25oC. The lowest corrosion rate was found in the alloy containing 3 at. % Ni. The chemical composition of the accumulated corrosion products was studied using XRD.The influence of nickel on the local corrosion resistance of the amorphous ribbons of (Al74Cu16Mg10)100-хNiх x = 0, 1, 2, 3% alloys was investigated electrochemically in a solution of 3.5% NaCl at 25°C. Pitting potential (Epitt) and repassivation potential (Erp) were determined. It was found that most resistant to pitting corrosion was the (Al74Cu16Mg10)97Ni3 alloy, which showed the noblest pitting potential (Epitt -0.332 V) and repassivation potential (Erp -0.530 V).All obtained corrosion test results of the nickel-containing amorphous alloys were compared to the base amorphous Al74Cu16Mg10 alloy. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123134938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}