European Journal of Engineering Science and Technology最新文献_第2页

Mine water chemistry development in the R3 shaft of the Rozna I uranium mine, Czech Republic 捷克Rozna I铀矿R3井矿井水化学发展

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i1.606

M. Vokurka, Lenka Mertová, Patricie Žilová

{"title":"Mine water chemistry development in the R3 shaft of the Rozna I uranium mine, Czech Republic","authors":"M. Vokurka, Lenka Mertová, Patricie Žilová","doi":"10.33422/ejest.v4i1.606","DOIUrl":"https://doi.org/10.33422/ejest.v4i1.606","url":null,"abstract":"The paper describes the current non-mining state of the Rozna I uranium mine which is located in the central part of the Czech Republic. The subject is a 1 200 m deep R3 shaft which is excavated from the surface. At the R3 shaft is carried out regular monitoring of mine water, specifically inflows to the deposit and their chemistry. Chemical monitoring is carried out by proper collection of mine water and their consequent chemical analysis in an accredited laboratory. \u0000The results of the chemical analysis were processed using standard text and spreadsheet editors and using geochemical modeling software. The paper defines several types of water with slightly different chemistry, but the majority is calcium sulphate type of mine water. Occasional fluctuations in mine water concentrations were not dependent on the concentration of extraction, because at the R3 shaft was extraction of uranium ore terminated in 1996. Fluctuations are attributed only to technological interventions of maintenance work on the shaft. The development of chemistry of mine water was described at the shaft during the years 1994 – 2019. The mine water from the R3 shaft were analyzed for the saturation index. Minerals which could precipitate under specific conditions in the form of amorphous precipitates, coatings or other precipitates, were described.","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127542170","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

Integrated Modeling of Natural Tin Photoactivation 天然锡光活化的集成建模

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i3.607

C. Oprea, A. Mihul, Alexandru Ioan Oprea

引用次数: 0

Experimental Approach to Monitoring the Degradation Status of Pipelines Transporting Hydrocarbons 烃类输送管道降解状况监测的实验方法

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i2.605

Sarah Yahi, A. Bensmaili, A. Haddad, Manel Benmohamed

引用次数: 0

Techno Economy Comparison of Conventional Generating Unit and Lithium Battery Energy Storage as a Primary Frequency Regulation of Variable Renewable Energy Penetrated Grid System, Case Study: Southern Sulawesi of Indonesia 常规发电机组与锂电池储能作为可变可再生能源并网系统一次调频的技术经济比较，以印度尼西亚苏拉威西岛南部为例

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i3.739

Rendy Yuliansyah, Aditya Idamsyah, Irwan Paundra, B. Priyono

引用次数: 0

Towards Developing Criteria to Evaluate the Functional Performance Efficiency of Learning Spaces 学习空间功能效能评估标准之探讨

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i3.598

Sara Hisham Br, Shahira Sharafeldin, S. Sheta, Wesam E Mehanna

{"title":"Towards Developing Criteria to Evaluate the Functional Performance Efficiency of Learning Spaces","authors":"Sara Hisham Br, Shahira Sharafeldin, S. Sheta, Wesam E Mehanna","doi":"10.33422/ejest.v4i3.598","DOIUrl":"https://doi.org/10.33422/ejest.v4i3.598","url":null,"abstract":"The spatial and geometric design of learning spaces plays an important role in transmitting the dynamics of learning. Recently, there has been a major milestone in effective teaching and learning methods (modern pedagogical approaches) that aim to shift students away from the traditional learning process towards collaborative, problem-oriented and independent learning. These changes required a new generation of learning spaces with different strategies and methods to adapt to these changes. This research problem lies in the huge gap between modern pedagogical methods and the spatial and geometric configuration of different learning spaces that do not meet the requirements of these methods. This article examines the impact of designing different learning spaces on learner-centred teaching and learning by understanding the interrelationships between research in architecture, learning sciences, and environmental psychology in order to achieve effective learning. As a result of the research, a set of criteria for evaluating the functional effectiveness of the research areas under consideration was developed.","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122653864","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

Nuclear Reaction Mechanisms of Neutron Induced Fission of 237Np Nucleus 237Np核中子诱导裂变的核反应机理

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i4.600

C. Oprea, Mohammad Ayaz Ahmad, Alexandru Ioan Oprea, J. B. H. Baker, N. Amrani

{"title":"Nuclear Reaction Mechanisms of Neutron Induced Fission of 237Np Nucleus","authors":"C. Oprea, Mohammad Ayaz Ahmad, Alexandru Ioan Oprea, J. B. H. Baker, N. Amrani","doi":"10.33422/ejest.v4i4.600","DOIUrl":"https://doi.org/10.33422/ejest.v4i4.600","url":null,"abstract":"At FLNP JINR Dubna new prospects for developing new neutron facilities have already been started, that will replace the IBR-2 neutron pulsed research reactor which shut down in the year 2032. Several agreed projects use the fission processes induced by neutrons on neptunium-based fuels. An investigation of the neutron fission process on the 237Np nucleus was conducted in the present research. Several parameters were analyzed during neutron-induced fission of 237Np including the neutron cross-section, mass distributions, prompt neutron emission, isotope production, and neutron spectra. Evaluations of the above observables were conducted using TALYS – 9.1 Software, with incident neutron energies ranging from 0.4 to 25 MeV. The exact value of cross-section was obtained as 5 – 5.5 MeV in the present work, whereas from literature, it was found up to 10 MeV. Neutron spectra were analyzed and separated contributions from different nuclear reaction mechanisms were obtained. Our investigations have revealed some important yields and isotope production cross-sections that were in good agreement with literature data.","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115250460","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

General Solution of Thick Plates on Winkler-Pasternak Foundation Using Orthogonal Polynomial Displacement Functions 用正交多项式位移函数求解Winkler-Pasternak地基厚板

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i4.591

F. Uzodinma, Onodagu P. Dinwoke, Aginam C. Henry, Ubani U. Obinna

{"title":"General Solution of Thick Plates on Winkler-Pasternak Foundation Using Orthogonal Polynomial Displacement Functions","authors":"F. Uzodinma, Onodagu P. Dinwoke, Aginam C. Henry, Ubani U. Obinna","doi":"10.33422/ejest.v4i4.591","DOIUrl":"https://doi.org/10.33422/ejest.v4i4.591","url":null,"abstract":"A solution for thick plates on Winkler-Pasternak foundation using characteristic orthogonal polynomials (COPs) displacement functions was presented in this study. A shear deformation function was developed from Soldatos’ (1992) trigonometric function and the Ritz energy approach was used to determine the total potential energy of the thick plate on elastic foundation. This method presents a simple and efficient method where only definite integration is required to obtain solutions. Results for non-dimensional in-plane and out-of-plane displacements for simply supported (SSSS) thick plates were presented and was observed to converge with that of other third-order shear deformation theories (TSDT) available in literature. From the study, it was observed that the in-plane and out-of-plane displacements reduced generally as the foundation modulus of the soil increased and decreases as the span-depth ratio increased for each aspect ratio. Both the Winkler and Pasternak foundation parameters influenced the results obtained as the foundation modulus is dependent on these parameters.","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121047973","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 Effect of Wire Rope Material on Vibration Characteristics 钢丝绳材料对振动特性的影响

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i1.608

H. Dal, Murat Baklaci

{"title":"The Effect of Wire Rope Material on Vibration Characteristics","authors":"H. Dal, Murat Baklaci","doi":"10.33422/ejest.v4i1.608","DOIUrl":"https://doi.org/10.33422/ejest.v4i1.608","url":null,"abstract":"Wire rope vibration isolators (WRI) are used to protect particularly sensitive and high technology products from severe dynamic loads such as shock and vibration. WRI is widely used in many industries, especially in the defense and space industry. In this study, the effect of rope material used in WRIs on vibration characteristics was experimentally investigated. WRIs were fabricated using nuflex, stainless steel and galvanized steel ropes as the main material component of the rope. Design and fabrication of 3 identical WRI models each with a rope diameter of 3 mm, namely Nufleks (NWRI), stainless (SWRI) and galvanized steel rope vibration isolator (GWRI), were performed. The produced WRI models were subjected to tensile-compression tests under different speed and pre-load conditions and then, force-displacement responses were obtained. In addition, dynamic vibration tests of WRI models were performed using the shaker system and accelerometers. As a result of the studies, it was observed that the rope material used in the WRIs significantly affected the vibration characteristics. When the quasi-static test results are examined, it is clearly understood that GWRI exhibits a more rigid characteristic compared to other models. At the same time, when the damping ratios obtained from hysteretic cycles are compared, it is clearly seen SWRI has the highest damping ratio. When the dynamic tests performed by shaker are examined, it is clearly seen that the isolator with the best vibration isolation characteristics is SWRI. \u0000 ","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124329162","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

Light Nuclei Evaluation by Resonance Neutron Reactions 用共振中子反应评价轻核

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i2.602

C. Oprea, A. Mihul, Alexandru Ioan Oprea

引用次数: 0

Enhancing Sentiment Analysis of Textual Feedback in the Student-Faculty Evaluation using Machine Learning Techniques 利用机器学习技术增强师生评价中文本反馈的情感分析

European Journal of Engineering Science and Technology Pub Date : 2021-12-20 DOI: 10.33422/ejest.v4i1.604

Caren A. Pacol, T. Palaoag

{"title":"Enhancing Sentiment Analysis of Textual Feedback in the Student-Faculty Evaluation using Machine Learning Techniques","authors":"Caren A. Pacol, T. Palaoag","doi":"10.33422/ejest.v4i1.604","DOIUrl":"https://doi.org/10.33422/ejest.v4i1.604","url":null,"abstract":"Sentiment Analysis has been an interesting and popular research area encouraging researchers and practitioners to adopt this tool in various fields such as the government, health care and education. In education, instruction evaluation is one of the activities that sentiment analysis has served. Though, it is a common practice that educational institutions periodically evaluate their teachers’ performance, students’ comments which are rich in insights are not easily taken into account because of lack of automated text analytics methods. In this study, supervised machine learning algorithms were used. Experiments were conducted to evaluate base models employing naïve bayes, support vector machines and logistic regression in comparison to ensemble combining the three. Random forest, an ensemble learning algorithm was also experimented. Machine learning techniques such as term-frequency – inverse document frequency (TF-IDF) and ngram were also explored to devise a model with the highest possible accuracy. Results show that in this case, tf-idf vectorization does not show significant improvement in sentiment classification. On the other hand, ngram vectorization improve performance of base models and has potential to improve ensemble models. Random forest showed higher performance measures than base models and ensemble of the three base models. However, it did not outperform ngram combined with support vector machines. In future work the model with highest accuracy found can be embedded in a sentiment analysis tool for students’ feedback on teaching performance. More advanced transformation techniques and other ensemble techniques may be explored to further improve accuracy in sentiment classification.","PeriodicalId":143710,"journal":{"name":"European Journal of Engineering Science and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131910857","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