The scope of this study was to compare various stability evaluation methods. Accordingly, most common LE approaches were compared with the advanced LE (M‐P) method. Similarly, the differences in FOS computed from LE and FE analyses were compared based on a simple slope considering various load cases. In addition, two real slopes in a case study were analysed for the recorded minimum‐maximum GWT, pseudo‐static and dynamic conditions. Moreover, the stability evaluations of these slopes were based on both LE (M‐P) and FE (PLAXIS) calculation approaches, which both utilized shear strength parameters from advanced triaxle tests. Similarly, Mohr‐Coulomb model was applied in both approaches. The following conclusions are hence derived based on the reported work on both idealized and real slopes. To fulfil one of the aims of the study, the LE based methods are compared based on the factor of safety (FOS) obtained for various load combinations. The comparison is mainly based on simplified slope geometry and assumed input parameters. Among the LE methods, the Bishop simplified (BS), Janbu simplified (JS) and Janbu GPS methods are compared with the Morgenstern‐Price method (M‐PM). These LE methods are well established for many years, and thus some of them are still commonly used in practice for stability analysis. Moreover, the M‐PM has been compared with results from the FE analyses. Compared with theFE (PLAXIS) analyses, the LE (M‐PM) analyses may estimate 5 – 14percent higher FOS, depending on the conditions of a dry slope and a fully saturated slope with hydrostatic pore pressure distributions. For fully saturated conditions in the slope, inaccurate computation of stresses in LE methods may have resulted in larger difference in the computed FOS. Since, the FE software is based on stress‐strain relationship, stress redistributions are surely better computed even for a complicated problem. This has been found one of the advantages in FE simulations. A parameter study shows that the application of a positive dilatancy angle in FE analysis can significantly improve the FOS (4 ‐ 10percent). On contrast, the shear surface optimization in LE (M‐PM in SLOPE/W) analysis results in lower FOS, and thus minimizing the difference in FOS compared with FE analysis
{"title":"Slopes Analyses - Case Study, Slope Stability of Bypass Project","authors":"Diana Bardhi","doi":"10.26417/466qfl71z","DOIUrl":"https://doi.org/10.26417/466qfl71z","url":null,"abstract":"The scope of this study was to compare various stability evaluation methods. Accordingly, most common LE approaches were compared with the advanced LE (M‐P) method. Similarly, the differences in FOS computed from LE and FE analyses were compared based on a simple slope considering various load cases. In addition, two real slopes in a case study were analysed for the recorded minimum‐maximum GWT, pseudo‐static and dynamic conditions. Moreover, the stability evaluations of these slopes were based on both LE (M‐P) and FE (PLAXIS) calculation approaches, which both utilized shear strength parameters from advanced triaxle tests. Similarly, Mohr‐Coulomb model was applied in both approaches. The following conclusions are hence derived based on the reported work on both idealized and real slopes. To fulfil one of the aims of the study, the LE based methods are compared based on the factor of safety (FOS) obtained for various load combinations. The comparison is mainly based on simplified slope geometry and assumed input parameters. Among the LE methods, the Bishop simplified (BS), Janbu simplified (JS) and Janbu GPS methods are compared with the Morgenstern‐Price method (M‐PM). These LE methods are well established for many years, and thus some of them are still commonly used in practice for stability analysis. Moreover, the M‐PM has been compared with results from the FE analyses. Compared with theFE (PLAXIS) analyses, the LE (M‐PM) analyses may estimate 5 – 14percent higher FOS, depending on the conditions of a dry slope and a fully saturated slope with hydrostatic pore pressure distributions. For fully saturated conditions in the slope, inaccurate computation of stresses in LE methods may have resulted in larger difference in the computed FOS. Since, the FE software is based on stress‐strain relationship, stress redistributions are surely better computed even for a complicated problem. This has been found one of the advantages in FE simulations. A parameter study shows that the application of a positive dilatancy angle in FE analysis can significantly improve the FOS (4 ‐ 10percent). On contrast, the shear surface optimization in LE (M‐PM in SLOPE/W) analysis results in lower FOS, and thus minimizing the difference in FOS compared with FE analysis","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128887641","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}
It has been a long time that human is interested in learning how to control involuntary actions such as heartbeat, blood pressure, breathing, etc., so a lot of research has been done on this issue so far. One of the methods using in this field is biofeedback, in which someone can roughly control an involuntary action or having better control over some voluntary actions such as muscle contraction through some visual or audio feedback from those actions. This study is to design and development of one biofeedback instrument, which is GSR (Galvanic Skin Response), and examine some signals that have been taken by this device.
{"title":"Design and Development of GSR Biofeedback Device","authors":"M. Hashemi","doi":"10.26417/920qjy95w","DOIUrl":"https://doi.org/10.26417/920qjy95w","url":null,"abstract":"It has been a long time that human is interested in learning how to control involuntary actions such as heartbeat, blood pressure, breathing, etc., so a lot of research has been done on this issue so far. One of the methods using in this field is biofeedback, in which someone can roughly control an involuntary action or having better control over some voluntary actions such as muscle contraction through some visual or audio feedback from those actions. This study is to design and development of one biofeedback instrument, which is GSR (Galvanic Skin Response), and examine some signals that have been taken by this device.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127014214","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}
Albanian Road Authority (ARA) under the administration of the Ministry of Energy and Infrastructure. It is responsible agency for the process of construction and maintenance of national and regional roads. Albanian Development Fund (ADF) is the agency for construction of rural and regional road infrastructure, also training for maintenance and management of municipalities responsible for maintenance of the urban and rural roads. ARA and ADF are using public funds for the construction of road infrastructure network, so due to restriction budgetary in road maintenance they the need to develop a strategy for the management and financial of maintenance, based on current accounting principles and efficiency of public funds in order to ensure safety and cost saving users. This includes the use of a balance of investments made to launch a database for years and the development of basic documents for the planning and control of public spending in these activities. The question that arises and requires an analysis is: a generally accepted value will be calculated for the infrastructure during its useful life, using the principles of sound accounting and valuation of real estate activities internationally applied. The results show that the existing accounting standards are suitable for use in infrastructure management, allowing a better control of public spending on infrastructure, while the principles of technical assessment of public infrastructure assets require the creation of a database and inventory for all road classification.
{"title":"Road Asset Management Assessment","authors":"Diana Bardhi","doi":"10.26417/646qpv23t","DOIUrl":"https://doi.org/10.26417/646qpv23t","url":null,"abstract":"Albanian Road Authority (ARA) under the administration of the Ministry of Energy and Infrastructure. It is responsible agency for the process of construction and maintenance of national and regional roads. Albanian Development Fund (ADF) is the agency for construction of rural and regional road infrastructure, also training for maintenance and management of municipalities responsible for maintenance of the urban and rural roads. ARA and ADF are using public funds for the construction of road infrastructure network, so due to restriction budgetary in road maintenance they the need to develop a strategy for the management and financial of maintenance, based on current accounting principles and efficiency of public funds in order to ensure safety and cost saving users. This includes the use of a balance of investments made to launch a database for years and the development of basic documents for the planning and control of public spending in these activities. The question that arises and requires an analysis is: a generally accepted value will be calculated for the infrastructure during its useful life, using the principles of sound accounting and valuation of real estate activities internationally applied. The results show that the existing accounting standards are suitable for use in infrastructure management, allowing a better control of public spending on infrastructure, while the principles of technical assessment of public infrastructure assets require the creation of a database and inventory for all road classification.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122662065","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}
Rockfall dynamics is a complex function of the location of the detachment point and the geometry and mechanical properties of both the block and the slope. Theoretically, knowing the initial conditions, the slope geometry, and the relationships describing the energy loss at impact or by rolling, it should be possible to compute the position and velocity of a block at any time. Nevertheless, relevant parameters are difficult to ascertain both in space and time, even for an observed event. Usually, the geometrical and geomechanically properties of the blocks (size, shape, strength, fracturing) and the slope (gradient, length and roughness, longitudinal and transversal concavities and convexities, grain size distribution, elastic moduli, water content, etc.), and the exact location of the source areas are unknown. In this paper, the sources of potential rock fallings involve a rocky area including between km 13+550 and km 13+600 in the new road of Vlora city in Albania. The area is characterized by a rock ridge, shaped like a dome, located few tens of meters above the design road. The purpose of this paper is the rock slope analysis. This analysis consists mainly of defining the sources of falling rocks, estimating the causes (by toppling, rock slides, single blocks) the size, the geometry, and type of blocks, the structural arrangement of joints, etc.
{"title":"Rockfall Analyses at Km 13+550 in the New Road of Vlora, Albania","authors":"Arjol Lule","doi":"10.26417/473cvm79a","DOIUrl":"https://doi.org/10.26417/473cvm79a","url":null,"abstract":"Rockfall dynamics is a complex function of the location of the detachment point and the geometry and mechanical properties of both the block and the slope. Theoretically, knowing the initial conditions, the slope geometry, and the relationships describing the energy loss at impact or by rolling, it should be possible to compute the position and velocity of a block at any time. Nevertheless, relevant parameters are difficult to ascertain both in space and time, even for an observed event. Usually, the geometrical and geomechanically properties of the blocks (size, shape, strength, fracturing) and the slope (gradient, length and roughness, longitudinal and transversal concavities and convexities, grain size distribution, elastic moduli, water content, etc.), and the exact location of the source areas are unknown. In this paper, the sources of potential rock fallings involve a rocky area including between km 13+550 and km 13+600 in the new road of Vlora city in Albania. The area is characterized by a rock ridge, shaped like a dome, located few tens of meters above the design road. The purpose of this paper is the rock slope analysis. This analysis consists mainly of defining the sources of falling rocks, estimating the causes (by toppling, rock slides, single blocks) the size, the geometry, and type of blocks, the structural arrangement of joints, etc.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125851651","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}
Can artificial intelligence (AI) be a sustainable way to help solving the Covid-19 global problem? What does the way how welfare states, charity organizations and labour markets are dealing with the pandemic crisis tells us about the AI capacity for reducing exposition of underprivileged groups to the desease? It is becoming more and more visible how the new coronavirus pandemic is affecting specifically the most deprived and vulnerable groups, and also the big difference that welfare states and their policies make. What did the pandemic show about the relations between social inequality, welfare state provision and AI? This presentation will discuss the role of AI as a tool for public policies fighting inequalities that were amplified during the Covid-19 crisis. It will be analysed how the welfare state, the labour market and social communities are already incorporating AI tools and how this can eventually produce more resilient paths. Accelareted and amplified by the Covid-19, several processes of AI penetration in health, education, healthcare, social security, public administrations, labour and surveillance of citizens, became a subject of public discussion. Artificial intelligence is currently a process of long-term change in health and biotechnologies, long-distance education, teleworking, automation, robotization, consumption behaviours, surveillance and human enhancement. An in-deep analysis of the Portuguese case will support the lessons that can be learnt from AI and its use in public policies in a context of pandemic crisis, leading to a set of political recommendations, to promote its application as a resilient tool to fight inequalities.
{"title":"Artificial Intelligence as a Resilient Tool for Fighting Inequalities in the COVID-19 Crisis","authors":"Luís Capucha, Nuno Nunes, A. Calado","doi":"10.26417/816dpn49i","DOIUrl":"https://doi.org/10.26417/816dpn49i","url":null,"abstract":"Can artificial intelligence (AI) be a sustainable way to help solving the Covid-19 global problem? What does the way how welfare states, charity organizations and labour markets are dealing with the pandemic crisis tells us about the AI capacity for reducing exposition of underprivileged groups to the desease? It is becoming more and more visible how the new coronavirus pandemic is affecting specifically the most deprived and vulnerable groups, and also the big difference that welfare states and their policies make. What did the pandemic show about the relations between social inequality, welfare state provision and AI? This presentation will discuss the role of AI as a tool for public policies fighting inequalities that were amplified during the Covid-19 crisis. It will be analysed how the welfare state, the labour market and social communities are already incorporating AI tools and how this can eventually produce more resilient paths. Accelareted and amplified by the Covid-19, several processes of AI penetration in health, education, healthcare, social security, public administrations, labour and surveillance of citizens, became a subject of public discussion. Artificial intelligence is currently a process of long-term change in health and biotechnologies, long-distance education, teleworking, automation, robotization, consumption behaviours, surveillance and human enhancement. An in-deep analysis of the Portuguese case will support the lessons that can be learnt from AI and its use in public policies in a context of pandemic crisis, leading to a set of political recommendations, to promote its application as a resilient tool to fight inequalities.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127117866","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}
Pub Date : 2019-08-31DOI: 10.26417/ejef.v3i2.p6-10
J. Teta, E. Xhafka, I. Bodi
Manufacturing industry in Albania has been grown significantly over the last decades due to increased public demand, Government’s initiatives, and the investors increased interest in the manufacturing sector. Unfortunately, quality of product is still an important issue for the locally produced goods. Only a few manufacturers are producing high quality products with higher customer satisfaction. Many of them are holding quality certificates but a few has reached a stage of product development where they are able to apply modern quality principles and techniques effectively. Research on product quality improvement shows that meeting customer satisfaction, increasing profits and reducing losses to a minimum level can be attained through the application of modern quality philosophies and principles such as Total Quality Management (TQM). Understanding the tools and techniques of TQM is considered to be significant in order to get useful results. A better understanding is required to investigate the current status of TQM implementation. This research article presents a survey on current quality control practices within the manufacturing industries in Albania to assess the potentiality of implementing TQM technique and principles in order to improve the customer satisfactions and market share.
{"title":"Implementation of TQM in Manufacturing Industries of Developing Countries - Case Study: Albanian Companies","authors":"J. Teta, E. Xhafka, I. Bodi","doi":"10.26417/ejef.v3i2.p6-10","DOIUrl":"https://doi.org/10.26417/ejef.v3i2.p6-10","url":null,"abstract":"Manufacturing industry in Albania has been grown significantly over the last decades due to increased public demand, Government’s initiatives, and the investors increased interest in the manufacturing sector. Unfortunately, quality of product is still an important issue for the locally produced goods. Only a few manufacturers are producing high quality products with higher customer satisfaction. Many of them are holding quality certificates but a few has reached a stage of product development where they are able to apply modern quality principles and techniques effectively. Research on product quality improvement shows that meeting customer satisfaction, increasing profits and reducing losses to a minimum level can be attained through the application of modern quality philosophies and principles such as Total Quality Management (TQM). Understanding the tools and techniques of TQM is considered to be significant in order to get useful results. A better understanding is required to investigate the current status of TQM implementation. This research article presents a survey on current quality control practices within the manufacturing industries in Albania to assess the potentiality of implementing TQM technique and principles in order to improve the customer satisfactions and market share.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123285752","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}
Pub Date : 2019-04-30DOI: 10.26417/ejef.v3i1.p6-17
Semih Dönmezer
Concept of quality, quality assurance, quality policy and quality management have long since become indispensable in economic aspects. Quality management systems and their meaning are no longer discussed every now and then they have become reality and economic necessity. Also, in public administration, in politics, in education and in the non-profit sector, declarations of quality and their steering and securing are of fundamental importance. The general trend is higher expectations as to the quality of the most diverse products - whether physical products or services - is accompanied by the growing awareness that only through continuous and consistent improvements. A high product quality adds to satisfy the needs of the population. Therefore, the extraction of high-quality information based on the measurement technology. The measurement technology is integrated into the production process maximally strongly.
{"title":"Statistical Process Control (SPC) and Quality Management Systems as a Specialty of Quality Management and Case Turkey","authors":"Semih Dönmezer","doi":"10.26417/ejef.v3i1.p6-17","DOIUrl":"https://doi.org/10.26417/ejef.v3i1.p6-17","url":null,"abstract":"Concept of quality, quality assurance, quality policy and quality management have long since become indispensable in economic aspects. Quality management systems and their meaning are no longer discussed every now and then they have become reality and economic necessity. Also, in public administration, in politics, in education and in the non-profit sector, declarations of quality and their steering and securing are of fundamental importance. The general trend is higher expectations as to the quality of the most diverse products - whether physical products or services - is accompanied by the growing awareness that only through continuous and consistent improvements. A high product quality adds to satisfy the needs of the population. Therefore, the extraction of high-quality information based on the measurement technology. The measurement technology is integrated into the production process maximally strongly.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128455216","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}
Pub Date : 2019-04-30DOI: 10.26417/ejef.v3i1.p33-32
Mirela Koci
Composite materials that have started to be used in the production of tourist sailing vehicles especially those of the yacht type, have proven in practice the designers' expectations for the great advantages they have brought in comparison with steel. The performance of new generation ships of this millennium will require the ever-increasing use of innovative materials to meet the growing demand of potential buyers of these vehicles.On the other hand, based on the principles already sanctioned by the European Community for respecting the norms set for CO2 emissions from shipping - in accordance with the Kyoto Protocol on Climate Change, it is necessary to produce marine vehicles that reduce significantly the weight of marine vehicles and for consequence the engine power and fuel consumption will significantly reduce CO2 emissions. This, in addition to the innovation that accompanies the production of marine engines, demonstrates the trend of the development of composite materials in relation to traditional materials.The global composite materials market is estimated at USD 24.4 billion in 2014 and is projected to reach 5.8% growth and is expected to grow at 5.8% in the next five years, reaching 34.4 billion in 2020.Through this scientific paper I will bring a contribution to the maritime sector, analysing the positive impact that has the production of marine vessels with composite materials in maritime transport industry, not only for their excellent technical performance, but also for their positive impact in CO2 emissions in maritime straight. The study has been developed based on data analysing of maritime vessels in the Straight of Otranto.
{"title":"Impact of Marine Vessels Produced with Composite Materials in Their Perfomance and Reduction of CO2 Emmisions.","authors":"Mirela Koci","doi":"10.26417/ejef.v3i1.p33-32","DOIUrl":"https://doi.org/10.26417/ejef.v3i1.p33-32","url":null,"abstract":"Composite materials that have started to be used in the production of tourist sailing vehicles especially those of the yacht type, have proven in practice the designers' expectations for the great advantages they have brought in comparison with steel. The performance of new generation ships of this millennium will require the ever-increasing use of innovative materials to meet the growing demand of potential buyers of these vehicles.On the other hand, based on the principles already sanctioned by the European Community for respecting the norms set for CO2 emissions from shipping - in accordance with the Kyoto Protocol on Climate Change, it is necessary to produce marine vehicles that reduce significantly the weight of marine vehicles and for consequence the engine power and fuel consumption will significantly reduce CO2 emissions. This, in addition to the innovation that accompanies the production of marine engines, demonstrates the trend of the development of composite materials in relation to traditional materials.The global composite materials market is estimated at USD 24.4 billion in 2014 and is projected to reach 5.8% growth and is expected to grow at 5.8% in the next five years, reaching 34.4 billion in 2020.Through this scientific paper I will bring a contribution to the maritime sector, analysing the positive impact that has the production of marine vessels with composite materials in maritime transport industry, not only for their excellent technical performance, but also for their positive impact in CO2 emissions in maritime straight. The study has been developed based on data analysing of maritime vessels in the Straight of Otranto.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"447 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122724397","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}
Pub Date : 2018-12-29DOI: 10.26417/ejef.v2i3.p96-100
A. Hayrapetyan
The Brillouin function arises in the quantum theory of paramagnetic materials, where it describes the dependence of the magnetization on the externally applied magnetic field and on the temperature of the system. There is no closed form exact analytical expression for the inverse Brillouin function, however, there have been several approximations proposed. In this work, we first compare relative errors and simplicity of several approximations for the inverse Brillouin function. Next, we demonstrate the application of the inverse Brillouin function by determining the Hamiltonian of the system using the simulation data of the magnetization dependence on the temperature. Then we compare the Hamiltonian that was used to set up the simulation with the Hamiltonian determined from the magnetization temperature dependence and an approximation to the inverse Brillouin function. We found that some of the approximations for the inverse Brillouin function can be used to accurately predict the Hamiltonian of the system given the magnetization dependence on temperature.
{"title":"Inverse Brillouin Function and Demonstration of Its Application","authors":"A. Hayrapetyan","doi":"10.26417/ejef.v2i3.p96-100","DOIUrl":"https://doi.org/10.26417/ejef.v2i3.p96-100","url":null,"abstract":"The Brillouin function arises in the quantum theory of paramagnetic materials, where it describes the dependence of the magnetization on the externally applied magnetic field and on the temperature of the system. There is no closed form exact analytical expression for the inverse Brillouin function, however, there have been several approximations proposed. In this work, we first compare relative errors and simplicity of several approximations for the inverse Brillouin function. Next, we demonstrate the application of the inverse Brillouin function by determining the Hamiltonian of the system using the simulation data of the magnetization dependence on the temperature. Then we compare the Hamiltonian that was used to set up the simulation with the Hamiltonian determined from the magnetization temperature dependence and an approximation to the inverse Brillouin function. We found that some of the approximations for the inverse Brillouin function can be used to accurately predict the Hamiltonian of the system given the magnetization dependence on temperature.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123162831","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}
Pub Date : 2018-12-29DOI: 10.26417/ejef.v2i3.p66-75
O. Krivenko, V. Mileikovskyi, T. Tkachenko
The article deals with the formation of a healthy human living environment in superstructure buildings with the requirements of indoor air quality, environmental and constructive safety. The results of the development of "Biotecton" - an ultra-high-rise multi-functional building (the height is 1000 m) are presented. In order to effectively overcome the wind and seismic loads, the principles of the structure of the natural form (Gramineae stems, Triticale) are used. It is a multi-tiered spatial structure, in the nodes of which there are dampers for limiting oscillatory movements. For solving the problems of increasing the energy efficiency of ventilation and air conditioning, the use of air from height 1000 m with the minimum of anthropogenic pollution is investigated. Two mechanisms of the movement of air in a superstructure were investigated: natural impulses (under the action of gravitational pressure and wind) and mechanical (fans). It is shown that the natural pressure is insufficient for air movement. The mechanical impulse is necessary, but its energy requirement can be compensated by a renewable energy source - wind turbines with a total capacity of 5.3 MW. For high air quality, the use of "oxygen gardens" in green areas, which are evenly spaced along the entire height of the building, is explored. The study proposed a list of plants that effectively clean air from pollution, sequestrate excess CO2, enrich the air with oxygen and release phytoncides that effectively fight against pathogenic microorganisms.
{"title":"The Principles of Energy Efficient Microclimate Provision in the Skyscraper “Biotecton” of 1 km Height","authors":"O. Krivenko, V. Mileikovskyi, T. Tkachenko","doi":"10.26417/ejef.v2i3.p66-75","DOIUrl":"https://doi.org/10.26417/ejef.v2i3.p66-75","url":null,"abstract":"The article deals with the formation of a healthy human living environment in superstructure buildings with the requirements of indoor air quality, environmental and constructive safety. The results of the development of \"Biotecton\" - an ultra-high-rise multi-functional building (the height is 1000 m) are presented. In order to effectively overcome the wind and seismic loads, the principles of the structure of the natural form (Gramineae stems, Triticale) are used. It is a multi-tiered spatial structure, in the nodes of which there are dampers for limiting oscillatory movements. For solving the problems of increasing the energy efficiency of ventilation and air conditioning, the use of air from height 1000 m with the minimum of anthropogenic pollution is investigated. Two mechanisms of the movement of air in a superstructure were investigated: natural impulses (under the action of gravitational pressure and wind) and mechanical (fans). It is shown that the natural pressure is insufficient for air movement. The mechanical impulse is necessary, but its energy requirement can be compensated by a renewable energy source - wind turbines with a total capacity of 5.3 MW. For high air quality, the use of \"oxygen gardens\" in green areas, which are evenly spaced along the entire height of the building, is explored. The study proposed a list of plants that effectively clean air from pollution, sequestrate excess CO2, enrich the air with oxygen and release phytoncides that effectively fight against pathogenic microorganisms.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117166954","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}
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