European Journal of Materials Science and Engineering最新文献_第10页

HOT COMPRESSION DEFORMATION BEHAVIOR AND CONSTITUTIVE ANALYSIS OF EXTRUDED MAGNESIUM-BISMUTH ALLOYS 挤压镁铋合金的热压缩变形行为及本构分析

European Journal of Materials Science and Engineering Pub Date : 2021-09-19 DOI: 10.36868/ejmse.2021.06.03.121

G. Xiong, Lihua Liu, Shuping Hou, Weimin Zhao, Hui Yu, Zhifeng Wang

引用次数: 0

MICROSTRUCTURAL AND PHYSICOCHEMICAL PROPERTIES OF SOME ALUMINUM COOKING TOOLS OBTAINED BY ARTISANAL RECYCLING 手工回收铝炊具的微观结构和物理化学性能

European Journal of Materials Science and Engineering Pub Date : 2021-09-19 DOI: 10.36868/ejmse.2021.06.03.148

Pali Kpelou, Essowè Mouzou, Essossinam Aminti, D. Kongnine

{"title":"MICROSTRUCTURAL AND PHYSICOCHEMICAL PROPERTIES OF SOME ALUMINUM COOKING TOOLS OBTAINED BY ARTISANAL RECYCLING","authors":"Pali Kpelou, Essowè Mouzou, Essossinam Aminti, D. Kongnine","doi":"10.36868/ejmse.2021.06.03.148","DOIUrl":"https://doi.org/10.36868/ejmse.2021.06.03.148","url":null,"abstract":"Recycling metals waste is one of the ways to recover this waste, but also to preserve mining resources and fight against pollution. Aluminum is one of the most recycled metals due to its relatively low melting temperature, high conductivity, ductility, malleability and its high resistance to corrosion. In Togo, as in many West African countries, aluminum wastes are collected, melted and molded in artisanal way to make new objects for domestic use. The aim of this work is to investigate the process of artisanal aluminum recycling and use several modern techniques of characterization in order to improve thereafter products and manufacturing process. Two types of samples were subjected to a series of physicochemical analysis. One from an old aluminum pot (sample (a)) and the other cut from newly pot obtained after artisanal manufacturing (sample (b)). The measurement of the temperature inside the crucible during scarp aluminum melting operation reveals three temperatures ranges with a melting point around 750℃. Atomic absorption spectrometry (AAS) indicates that the two samples contain mostly aluminum, zinc, copper, magnesium and some traces of lead. Optical microscopy observations show that the alpha aluminum matrix was the most abundant phase with 80 to 90% of the observed area and some inclusions randomly dispersed. X- ray diffraction (XRD) confirms the presence of lines characteristic of alpha aluminum and bohemite (γ-AlOOH).","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47007477","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

INVESTIGATION ON THE SURFACE QUALITY OF BÖHLER S290 POWDER METALLURGICAL TOOL STEEL AFTER WEDM MACHINING BÖHLER S290粉末冶金工具钢电火花加工表面质量的研究

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.075

L. Toth

{"title":"INVESTIGATION ON THE SURFACE QUALITY OF BÖHLER S290 POWDER METALLURGICAL TOOL STEEL AFTER WEDM MACHINING","authors":"L. Toth","doi":"10.36868/EJMSE.2021.06.02.075","DOIUrl":"https://doi.org/10.36868/EJMSE.2021.06.02.075","url":null,"abstract":"Nowadays, there is a growing demand for fast, accurate and precise tool manufacturing. At the same time, the requirements for the quality of tool steel materials have also increased. Increasingly, tools are being made from high alloyed, highest purity, segregation free, homogenous and high hardness materials. These materials are difficult to machine with conventional technology. For this problem a solution could be the electrical discharge machining technology (EDM). During the EDM process an electrical discharge occurs between an anode and a cathode in a dielectric medium [1]. The EDM process is characterized by high heat, that cause structural changes on the surface of the machined materials. In EDM process the surface of the machined material is eroded by melting and evaporation due to large quantity of heat [2]. This paper presents a study of the wire EDM machining surface of S290 PM HSS materials with different parameters performed by multiple cutting. The aim of this investigation was to find the optimal parameters and trim cuts number for the efficient production of the tools from S290 HSS PM materials with the required surface quality.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46792800","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

THE POSSIBILITIES OF THE RETAINED AUSTENITE REDUCTION ON TOOL STEELS 工具钢残余奥氏体还原的可能性

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.099

L. Tóth

引用次数: 3

RESEARCH OF PHYSICO CHEMICAL PARAMETERS BEFORE AND AFTER THE USE OF THERMAL WATER IN THE PEJA BATH 泡浴用热水前后理化参数的研究

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.106

Florent Dobroshi, F. Maloku, Krenar Dobroshi

{"title":"RESEARCH OF PHYSICO CHEMICAL PARAMETERS BEFORE AND AFTER THE USE OF THERMAL WATER IN THE PEJA BATH","authors":"Florent Dobroshi, F. Maloku, Krenar Dobroshi","doi":"10.36868/EJMSE.2021.06.02.106","DOIUrl":"https://doi.org/10.36868/EJMSE.2021.06.02.106","url":null,"abstract":"With the development and growth of the population, the demand for quality and safe water increases. The desire for a healthy body, at the same time to cure various health problems and to enjoy the natural beauty pushed one for the sources of thermal water springs, mostly natural and rich in innumerable healing properties for each disease. The purpose of this study is to investigate the physicochemical parameters of thermal water in Banja e Pejes, where sampling sites are located at inlet water sources, during use and at some exit points after thermal water has been used by the hospital for the treatment of several different diseases. A total of 12 samples were taken in this paper. dated: 23.12 2020, where samples are in three time frames 4 samples are taken at 8:00 am, the other 4 samples were taken at 11:00 am, and the last 4 samples were taken at 16:00 pm. The assays were performed with the most advanced methods at the University of Mitrovica Laboratory, we used spectrophotometric method, comparative method and in very rare cases standard classical method of analysis. In this case we have determined: temperature, dissolved oxygen, pH, electrical fluidity, odor, taste, turbidity, nitrates and nitrite. The purpose of this research is to analyze thermal waters before and after use by the Banja e Pejes and their discharge into the environment where it can have consequences for both flora and fauna may also have an impact on the waters used for drinking where the day by day is further reduced.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42669037","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

GUAR GUM HYDROGEL MICROBIAL FUEL CELL USING B.MEGATERIUM 瓜尔胶水凝胶微生物燃料电池

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.089

Sumin Kim

{"title":"GUAR GUM HYDROGEL MICROBIAL FUEL CELL USING B.MEGATERIUM","authors":"Sumin Kim","doi":"10.36868/EJMSE.2021.06.02.089","DOIUrl":"https://doi.org/10.36868/EJMSE.2021.06.02.089","url":null,"abstract":"The main factors of a microbial fuel cell (MFC) are the anode and the microorganisms around it that produce electrons. This research focuses on increasing the efficiency of a MFC in plantMFC (PMFC) or aquarium-like conditions by inoculating microorganisms that help produce electrons to the soil. Guar gum was used as a base structure as it can culture microorganisms and create a hydrogel by cross-linking with borax.[1,2] Bacillus megaterium was added to the hydrogel as it can survive under the basic conditions of borax while producing electrons.[3] Glucose was added as well to help culture the bacteria. Then, the change of voltage was observed along with the growth of B.megaterium. A compound consisting of 0.5% glucose, 1% Guar gum, 10% Borax, and B.megaterium culture medium was created with a volume ratio of 1:25:1:1 in each order. This compound will be named GGB-B. GGB-B was able to keep its shape as a hydrogel along with a voltage increase of 250mV compared to control due to the stable growth of B.megaterium. 100g of GGB-B was placed inside a beaker and was covered with aquarium soil. Two goldfishes (Carassius auratus) were added. Voltage, pH, and the health of goldfishes were observed for 9 days. The result was approximately a 150mV increase in voltage compared to control (tap water). pH decrease was about 1.3, showing a pH of 6.12. There was no change in the goldfishes, and the GGB-B under the aquarium soil fused with the soil as it disintegrated. Therefore, when electron-producing microorganisms such as B.megaterium are added to guar gum, the microorganisms would slowly spread over the soil, thereby increasing the efficiency of MFC. This could also apply to PMFC and aquarium-like conditions as well.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49125169","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

INTRODUCTION OF RESIDUAL CHLORINE SENSOR USING CONSTANT VOLTAGE METHOD AND ITS MEASUREMENT PRINCIPLES 恒压法余氯传感器及其测量原理介绍

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.113

J. Kil

{"title":"INTRODUCTION OF RESIDUAL CHLORINE SENSOR USING CONSTANT VOLTAGE METHOD AND ITS MEASUREMENT PRINCIPLES","authors":"J. Kil","doi":"10.36868/EJMSE.2021.06.02.113","DOIUrl":"https://doi.org/10.36868/EJMSE.2021.06.02.113","url":null,"abstract":"In the past, we could never imagine buying drinkable water. Who would buy to drink water? But now, bottled water are sold just about anywhere in the world, but there are still many countries with water supply shortages. When drinking water is contaminated with microorganisms, it can be exposed to various diseases such as hepatitis, cholera, diarrhea, and typhoid fever. We are not only interested in drinking water, but also the water used in bathrooms, gardens, and laundry of each household. We mention “water quality” because all of these kinds of water are enough to give us a direct stimulus such as odors and greens. When we use tap water in each household, the most direct irritation is the “smell”. In this case, we know that chlorine comes to mind first, and that chlorine is very useful in disinfection. Then, why are we sensitive to toxic odors in drinking water or swimming pools? The answer is simple. The effect of disinfecting with chlorine is only exerted in clear water, and we need to focus on the analysis of residual chlorine that is important for instrumental analysis. Therefore, what is introduced in this study is a “residual chlorine sensor” of a new constant voltage method that can be more accurate in measuring the amount of residual chlorine in water which is the most important factor when it comes to effectively disinfecting our drinking water.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43960254","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

EDUCATION THROUGH INNOVATION IN THE FIELD OF METALLIC MATERIALS SCIENCE 金属材料科学领域的创新教育

European Journal of Materials Science and Engineering Pub Date : 2021-06-20 DOI: 10.36868/EJMSE.2021.06.02.083

A. Ioana, D. Tufeanu, D. Marcu, B. Florea, Daniela Luta, B. Ene, D. Juganaru, R. Solea

引用次数: 0

IDENTIFICATION RADIOACTIVE WASTE AND TREATMENT OF HAZARDOUS SUBSTANCES IN KOSOVO 科索沃放射性废物的鉴定和危险物质的处理

European Journal of Materials Science and Engineering Pub Date : 2021-03-30 DOI: 10.36868/EJMSE.2021.06.01.030

B. Cena

引用次数: 0

MAGNETIC BALANCE FOR CURIE TEMPERATURE IN AMORPHOUS MATERIAL RESEARCH 磁天平用于非晶材料居里温度的研究

European Journal of Materials Science and Engineering Pub Date : 2021-03-30 DOI: 10.36868/EJMSE.2021.06.01.065

B. Płoszaj

引用次数: 0