Contemporary Materials最新文献_第8页

ACTIVITIES ON THE LEGAL FRAMEWORK FOR THE PROTECTION AGAINST THE RADON IN BOSNIA AND HERZEGOVINA 关于波斯尼亚和黑塞哥维那境内防止氡的法律框架的活动

Contemporary Materials Pub Date : 2020-01-10 DOI: 10.7251/comen2001058i

Maida Isović

{"title":"ACTIVITIES ON THE LEGAL FRAMEWORK FOR THE PROTECTION AGAINST THE RADON IN BOSNIA AND HERZEGOVINA","authors":"Maida Isović","doi":"10.7251/comen2001058i","DOIUrl":"https://doi.org/10.7251/comen2001058i","url":null,"abstract":"The legal framework for the protection against the radon in Bosnia and Herzegovina (hereinafter: BiH) is outdated. It covers the works involved in the practices with ionizing sources but does not clearly defines the activities which could involve NORM. The protection against the radon exposure goes beyond the radiation protection field, since it includes the building codes, the legal framework on air quality, and many other relevant legislations in BiH which now do not include the recommendation on protection against radon. As the BiH is a member of the International atomic energy agency (hereinafter: IAEA) and potential candidate for European union (hereinafter: EU) membership, activities of the State regulatory agency for radiation and nuclear safety (hereinafter: SRARNS), include activities on improvement and extension of the legal framework for protection against the radon exposure, which means the creation of new Regulation on monitoring of radioactivity in BiH. The most important activity concerning 222Rn matter is the national technical cooperation project with the IAEA TC for the cycle 2020-2021. Through this project BiH will gather first comprehensive measurements of the radon concentration from the whole territory in systematic way. The result of this project will help to create a first versions of the database and map radon concentration. The working group, made of the representatives of the relevant institutions, will have to decide which following steps BiH’s government will need to do to enable its citizens healthier living and working environment when it comes to the protection against the radon exposure.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80246504","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 GOOGLE SOLUTIONS FOR EVALUATION OF EFFICIENCY AND COST OF APPLICATION QUALITY AND FOOD SAFETY MANAGEMENT SYSTEM 应用Google解决方案进行效率和成本评价，应用质量和食品安全管理体系

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902190n

B. Novaković, I. Grujić

{"title":"APPLICATION OF GOOGLE SOLUTIONS FOR EVALUATION OF EFFICIENCY AND COST OF APPLICATION QUALITY AND FOOD SAFETY MANAGEMENT SYSTEM","authors":"B. Novaković, I. Grujić","doi":"10.7251/comen1902190n","DOIUrl":"https://doi.org/10.7251/comen1902190n","url":null,"abstract":"This paper presents the results of research carried out in companies engaged in the production and distribution of bakery products, which relate to the advantages, disadvantages and costs of implementing the system for quality and food safety management. In focused companies, a quality and food safety management system has been applied, which, after development, has been certified by independent certification bodies. The methodology for collecting data using the Google questionnaire that was created and through which the data from the surveyed companies was obtained. The highest initial costs during the introduction of quality and food safety management systems relate to the elucidation of infrastructure deficiencies (66.6% of surveyed enterprises) and consulting services (33.3% of surveyed enterprises). A key advantage of establishing a company's quality management system is to improve document management and product quality improvement (4.55). The applied quality management systems and food safety systems offer companies numerous advantages, savings in business and represent a model by which applications and other companies can improve their own performance. Determining system efficiency methodologically using google questionnaires is a very simple and useful tool that can be used for similar research with minimal knowledge of online programming techniques.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77174916","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

NEW APPROACH TO DETECTION OF ABNORMAL CERVICAL CELLS 宫颈异常细胞检测的新方法

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902132j

B. Jeftic, L. Matija, Đ. Koruga

引用次数: 0

THERMAL ANALYSIS OF FOOD PRODUCTS USING DIFFERENTIAL SCANNING CALORIMETRY (DSC) 差示扫描量热法(dsc)在食品热分析中的应用

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902175g

R. Grujić, D. Savanović

引用次数: 2

COMPARATIVE INVESTIGATION OF FIXED AND TRACKING PV SOLAR POWER PLANTS ENERGY EFFICIENCY 固定式与跟踪式光伏太阳能电站能源效率的比较研究

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902145p

D. Mirjanić, T. Pavlovic, I. Radonjić, Darko Divnić

引用次数: 0

THE INFLUENCE OF SOLAR MODULES SOILING ON THEIR ENERGY EFFICIENCY 太阳能组件污染对其能源效率的影响

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902152r

I. Radonjić, T. Pavlovic, D. Mirjanić, Darko Divnić

引用次数: 0

PRODUCTION OF WOOD ENERGY BY CHIPPING 通过削木生产木材能量

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902159m

D. Marčeta, V. Petković, Gordana Globočki Lakić

{"title":"PRODUCTION OF WOOD ENERGY BY CHIPPING","authors":"D. Marčeta, V. Petković, Gordana Globočki Lakić","doi":"10.7251/comen1902159m","DOIUrl":"https://doi.org/10.7251/comen1902159m","url":null,"abstract":"Increasing demand for using renewable energy resources is strongly emphasized during the last decades. On the international level it is recognized through a series of conventions, conclusions and recommendations. Forests are energy source through conversion of wood biomass into solid, fluent and gaseous fuels for industrial and household use. Wood chips is a form of biomass, size of 5-50 mm, which is obtained by chipping of lower quality logs, trees, brushwood and wood residues. Some investigation showed that choosing the right chipper is crucial in a projection of chipping system. In this study, chipping at the landing site was compared with the Jenz HEM 700 and Pezzolato PTH 1300/1500 chippers. The subject of chipping was beech long fuelwood and stacked fuelwood. The investigation was done with the time and work-study method. Cost calculation was performed according to FAO methodology, slightly modified for local conditions. Also, in simulations, Jenz HEM 561 DQ was included in order to cover a wider range of chippers by the capacity, but data for this chipper were undertaken from other research. Unit costs of chipping were calculated on the basis of raw material input and chipper output. Unit costs were expressed for factory projected chippers productivity also, in order to compare obtained unit costs with costs when chippers are working below full capacity. Results of the productivity and cost calculation of chippers showed that bigger chippers had lower unit costs, but because of inability to achieve full capacity at the forest landing site and because of their dimensions which hinder the manipulation, it can be recommended using of chippers of smaller capacity like Jenz HEM 561 DQ or even smaller.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88917343","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

TECHNICAL AND ECONOMIC DEVELOPMENT OF THE PHOTOVOLTAIC ELECTRICITY IN BULGARIA 保加利亚光伏发电的技术和经济发展

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902119t

M. Yovchev, Plamen Tsenkov Tsankov

{"title":"TECHNICAL AND ECONOMIC DEVELOPMENT OF THE PHOTOVOLTAIC ELECTRICITY IN BULGARIA","authors":"M. Yovchev, Plamen Tsenkov Tsankov","doi":"10.7251/comen1902119t","DOIUrl":"https://doi.org/10.7251/comen1902119t","url":null,"abstract":"The paper presents technical and economic data on the development of photovoltaic electricity in Bulgaria over the last 10 years. The mix of different types of conventional and renewable energy sources in the country's electricity system is shown. The changes in the installed photovoltaic capacities and the price of electricity generated by them for the studied period are shown in tabular and graphical form. The number of photovoltaic power plants and their distribution by groups of individual powers are given. Brief technical and economic data for some of the largest photovoltaic power plants in Bulgaria are provided. Data analysis shows a short period of rapid development of highcapacity photovoltaic power plants construction after the introduction of high feed-in tariff for the purchase of photovoltaic electricity, as well as the influence of the installed photovoltaic capacities on the market change of the feed-in tariff over time. Feed-in tariff cost decreases remarkably with the increase of the installed photovoltaic capacity and even shows removal tendency for larger-capacity photovoltaic power plants. Examples of the economic profitability of grid-connected and autonomous photovoltaic systems in Bulgaria are given. The analysis and conclusions of the paper could be useful in determining new government policies and setting new market conditions to promote the development of renewable energy sources in Bulgaria and other countries.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89474852","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

ATOMIC FORCE MICROSCOPY AS A TOOL FOR TESTING BIOMEDICAL SAMPLES AND ELIMINATION PROBE ARTIFACTS 原子力显微镜作为测试生物医学样品和消除探针伪影的工具

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902137p

L. Petrov, L. Matija

{"title":"ATOMIC FORCE MICROSCOPY AS A TOOL FOR TESTING BIOMEDICAL SAMPLES AND ELIMINATION PROBE ARTIFACTS","authors":"L. Petrov, L. Matija","doi":"10.7251/comen1902137p","DOIUrl":"https://doi.org/10.7251/comen1902137p","url":null,"abstract":"One of the most perspective available techniques for investigation of the composition, structure and properties of materials, is scanning probe microscopy (SPM), respectively its components scanning tunneling microscopy (STM) and atomic force microscopy (AFM). This technique is used in multidisciplinary research in the field of medicine, pharmacy, dentistry, material science, etc., for study of biological samples, chemical compounds, pharmaceutical products, artificial tissues, implantology materials, and all other materials that have nanotechnological impact on application in these scientific fields. This is because the probes have not perfect size and geometry, which leads to the appearance of artifacts. They are defined as characteristics that appear on the image and are not present on the sample. These effects caused by convolutions between the probe and sample can be corrected to a certain extent by mathematical manipulation of topographic data. The methodology used in this paper is based on algebra of sets, and basic tools of mathematical morphology. Mathematical algorithms for the „blind reconstruction“ of the tip were used, and then in order to detect the parts of the sample surface which is not available in real-time scanning deconvolution was applied. The limit of the real probe tip is calculated from the image, using the morphological limitations inherent in the recording process. The result acuired as an image of the reconstructed surface out of the used images, with the reconstruction of the real tip. The presented results are clear proof of the usability of atomic force microscopy as a technique for imaging of biological materials on nano-level, and the applied algorithms increase the usability of the images in terms of a better conclusion based on precise numerical data taken from the processed images.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73487120","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

EVALUATION OF GINGIVAL MICROLEAKAGE IN CLASS II COMPOSITE RESTORATIONS: AN IN VITRO STUDY ii类复合修复体牙龈微渗漏的评估:一项体外研究

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902182j

O. Janković, S. Paraš, R. Arbutina, Irena Kuzmanović Radman, Tijana Adamović, V. Veselinović, V. Mirjanić

{"title":"EVALUATION OF GINGIVAL MICROLEAKAGE IN CLASS II COMPOSITE RESTORATIONS: AN IN VITRO STUDY","authors":"O. Janković, S. Paraš, R. Arbutina, Irena Kuzmanović Radman, Tijana Adamović, V. Veselinović, V. Mirjanić","doi":"10.7251/comen1902182j","DOIUrl":"https://doi.org/10.7251/comen1902182j","url":null,"abstract":"Introduction: Evaluation of microleakage is important for assessing the success of new restorative materials and methods. The aim of this study was to assess the microleakage of class II restorations with different flowable composites as liners and two different polymerization techniques classic and soft start. Materials and Methods: 40 extracted human premolars teeth with class II cavity preparation medial and distal (80 cavities) were divided into four groups: 1.Vertise Flow (VF)+micro hybrid composite Herculite 2.Surefil SDR Flow (SDRF)+micro-hybrid composite Herculite 3.Tetric Flow (TF)+micro-hybrid composite Herculite 4.control group micro-hybrid composite Herculite. Mesial cavities are polymerized with classic and distal cavity with soft start technique of polymerization. After that, the samples were immersed in 0.5% AgNO3 solution and sectioned into the mesiodistal direction. Using a stereomicroscope (Nikon - Japan), with a magnification of 40x, the gingival microleakage of cavities was examined. Data were analyzed using Fisher's and Student's tests. Results: After using the classical polymerization technique, all three used flowable composites VF+Herculite, SDRF+Herculite, TF+Herculite showed less gingival microleakage than the control group. This difference was statistically significant. After the application of the soft-start technique of polymerization, VF+Herculite and SDRF+Hercules showed a statistically significant reduction in gingival microleakage, while TF+Herculite showed a comparable result with control group, without a statistically significant difference. There was no statistically significant difference between classical and soft start polymerization techniques. Conclusion: Flowable composites in this study have reduced gingival microleakage and can be used as liners in the restoration of II class cavities.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86308770","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