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

EFFECT OF BORON ON THE WEAR BEHAVIOR OF HIGH CHROMIUM WHITE CAST IRONS 硼对高铬白口铸铁磨损性能的影响

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol3.7294

J. Kaleicheva, Krassimir S. Kirov, V. Mishev, R. Lazarova, Z. Karaguiozova

{"title":"EFFECT OF BORON ON THE WEAR BEHAVIOR OF HIGH CHROMIUM WHITE CAST IRONS","authors":"J. Kaleicheva, Krassimir S. Kirov, V. Mishev, R. Lazarova, Z. Karaguiozova","doi":"10.17770/etr2023vol3.7294","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7294","url":null,"abstract":"The wear behavior of high chromium white cast irons with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr and 0,18 ÷ 1,25% B is investigated. The microstructure and tribological characteristics of six compositions of high chromium white cast irons (one without boron and with 0,18; 0,23; 0,59; 0,96; 1,25% boron) are studied.After casting, heat treatment was carried out, including quenching at 9500C and tempering at 2350C for 1 h. The influence of the heating temperature in the interval 850÷11000С, 25 min on the Rockwell hardness and the microstructure are studied.The wear resistance during abrasive wear for samples after casting and after heat treatment is investigated as measured loss of mass in terms of dry friction under load of 1,5 kg during 10 min. The lowest mass loss during abrasive wear test in dry conditions friction is defined for cast irons alloyed with 0,18 % boron - ∆ m = 0,1469 g after casting and ∆ m = 0,0022 g after heat treatment. The highest mass loss is determined during abrasive testing of alloyed cast irons with 0,96 and 1,25% boron. The alloyed cast irons with 0,18 % boron show highest wear resistance. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"149 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":"115631377","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}

引用次数: 0

ASSESSMENT BY MACROINVERTEBRATES OF THE ECOLOGICAL QUALITY OF SHALLOW LAKE WITH RICH SAPROPEL SEDIMENTS 大型无脊椎动物对富含沉积物的浅湖生态质量的评价

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol1.7315

R. Tretjakova, Jana Paidere, Aija Brakovska

{"title":"ASSESSMENT BY MACROINVERTEBRATES OF THE ECOLOGICAL QUALITY OF SHALLOW LAKE WITH RICH SAPROPEL SEDIMENTS","authors":"R. Tretjakova, Jana Paidere, Aija Brakovska","doi":"10.17770/etr2023vol1.7315","DOIUrl":"https://doi.org/10.17770/etr2023vol1.7315","url":null,"abstract":"In this research, the ecological quality of the Lake Vēveru (Latvia, Rēzekne district) according to macroinvertebrates was investigated. The Lake Vēveru has a large sapropel deposit. The Lake Vēveru is relatively little affected by human economic activity, the only moderate impact is sapropel mining in the lake in 2009-2012, it is planned to resume industrial sapropel mining in the lake. During the period of sapropel removal, a decrease in the transparency of water is noted due to the nutrient flow into the water mass, pH increases, the habitat of planktonic and benthic organisms is disturbed. Macroinvertebrates samples were collected and analyzed using standard methods in the open pelagic and littoral zones of the lake in different seasons. The ecological quality of the lake was assessed in accordance with the requirements of the European Water Framework Directive in Latvia. To characterize the ecological status of the lake the Latvian Lake Macroinvertebrate Multimetric Index was used. According to the Ecological Quality Ratio (EQR) the lake indicates a good ecological status of the water. However, a moderately low species diversity index indicates the dominance of certain taxa. In general, macroinvertebrates species that are often and widely found in Latvia and are environmentally tolerant have been found in the lake. Water temperature, pH, conductivity, dissolved oxygen, oxidation reduction potential, chlorophyll-α were measured with a HACH OTT DS5 Probe. Water transparency was measured using a Secchi disc. ","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"7 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":"121075302","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}

引用次数: 1

RESEARCH INTO 3D PRINTING LAYER ADHESION IN ABS MATERIALS abs材料3d打印层黏附研究

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol3.7255

Valeri Bakardzhiev, Sabin Sabev, P. Kasabov, Konstantin Chukalov

引用次数: 0

PREREQUISITES FOR THE CREATION OF THE "FROM FARM TO SCHOOL" MODEL IN THE KLAIPEDA REGION: THE STUDY OF TARGET GROUPS’ EXPECTATIONS AND PERCEPTIONS 在克莱佩达地区创建“从农场到学校”模式的先决条件:研究目标群体的期望和看法

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol1.7286

J. Melnikova, I. Dailidienė, Simona Graigaliūnienė, Eglė Stonkė

{"title":"PREREQUISITES FOR THE CREATION OF THE \"FROM FARM TO SCHOOL\" MODEL IN THE KLAIPEDA REGION: THE STUDY OF TARGET GROUPS’ EXPECTATIONS AND PERCEPTIONS","authors":"J. Melnikova, I. Dailidienė, Simona Graigaliūnienė, Eglė Stonkė","doi":"10.17770/etr2023vol1.7286","DOIUrl":"https://doi.org/10.17770/etr2023vol1.7286","url":null,"abstract":"The focus of the article is on school meal programs that are common throughout the world and are implemented to promote students’ healthy eating habits and bring added value to their learning outcomes. In recent years there has been increasing emphasis on the possibility of improving school meals by including locally grown products, thus contributing to the development of local economic systems. This model has acquired the name \"Farm to School\" in practice of some countries and, according to its supporters, emphasizes public procurement of locally grown food as a key market opportunity for farmers. The article has been prepared within the BSR Food Coalition project (funded by Interreg Baltic Sea Region Program, contract #S002). The project seeks to create the conditions for the emergence of the \"From farm to school\" model in the Baltic States. The study presented in the article aims at disclosing the conditions and opportunities for the promotion and use of foods produced by local farmers in general education schools in Klaipeda region, Lithuania as well as at defining necessary educational efforts to increase healthy nutrition, develop general health habits, and agricultural and food system literacy within general education schools and their communities. To achieve the aim the surveys with project target groups (school administration, students and their parents) have been carried out in Klaipeda region. The objectives of the survey were to gather data on target groups’ perceptions of local school food procurement and to disclose their opinion, needs and expectations related to model development. The findings of the study would be helpful for designing the further steps of collaboration between schools and local farmers in Klaipeda region. .","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"9 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":"122983535","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}

引用次数: 1

INVESTIGATION OF SURFACE ROUGHNESS OF CARBON STEEL MACHINED PARTS AFTER NANOSECOND FIBER LASER MARKING 纳秒光纤激光打标后碳钢加工件表面粗糙度的研究

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol3.7317

P. Tsvyatkov, E. Hristov Yankov, L. Lazov, E. Teirumnieks, K. Pīgožnis

引用次数: 0

IMPACT OF TYPES OF ELECTROMAGNETIC RADIATION ON LIVING NATURE 各类电磁辐射对生物的影响

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol1.7224

N. Dolchinkov, B. E. Karaivanova-Dolchinkova

引用次数: 0

FREQUENCY ANALYSIS OF AN ARM OF MACPHERSON SUSPENSION ON A PASSENGER CAR 客车麦克逊悬架臂的频率分析

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol3.7277

S. Taneva, K. Ambarev, S. Penchev, Hristo Atanasov

引用次数: 0

PROPERTY INSURANCE DECISION-MAKING ON THE BASIS OF UTILITY FUNCTIONS 基于效用函数的财产保险决策

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol2.7308

Oleg Uzhga-Rebrov, G. Kuleshova

引用次数: 0

ANALYSING THE INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE PROCESS OF LASER MARKING OF SURFACE OF ANODISED ALUMINIUM SAMPLES 分析了工艺参数对阳极氧化铝样品表面激光打标工艺的影响

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol3.7270

Ļubova Denisova, Antons Pacejs, E. Hristov Yankov, L. Lazov

{"title":"ANALYSING THE INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE PROCESS OF LASER MARKING OF SURFACE OF ANODISED ALUMINIUM SAMPLES","authors":"Ļubova Denisova, Antons Pacejs, E. Hristov Yankov, L. Lazov","doi":"10.17770/etr2023vol3.7270","DOIUrl":"https://doi.org/10.17770/etr2023vol3.7270","url":null,"abstract":"The requirements for marking in terms of contrast and durability are constantly increasing. In order to meet all these challenges, it is necessary to carry out research leading to the optimisation and increase in efficiency of the technological process of laser marking. In the case of aluminium, the contrast and durability of the marking depend on the values of the laser marking parameters. In order to determine the optimal laser marking method, experimental studies have been carried out, controlling the power, speed, frequency, pulse duration and line raster step for a specific anodised aluminium. The studies carried out were analysed and subsequently optimized to obtain a contrast marking. A Rofin PowerLine F 20 Varia fiber laser system and aluminium alloy 1050 with anodised surface were used for the research. The surface changes after the laser treatment were analysed using a laser scanning microscope and contrast determination method. The dependence of contrast and roughness on speed, power, frequency and raster step was analysed. Comparative plots of contrast and roughness variations versus laser marking technological parameters were constructed.","PeriodicalId":332103,"journal":{"name":"ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference","volume":"82 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":"124162865","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}

引用次数: 0

APPLICATION OF THE FINITE ELEMENT METHOD FOR THE DESIGN OF SMALL ARM BARRELS 有限元法在小臂枪管设计中的应用

ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference Pub Date : 2023-06-13 DOI: 10.17770/etr2023vol2.7213

C. Conev, T. Karadzhov

引用次数: 0