Diffusion processes on the contact areas of the metal-solder-semiconductor system are experimentally studied in this work. Diffusion coefficients, activation energies and pre-exponential factors in samples commutated with solders based on Pb-Sb are determined. It has been established that lead-based solder has a significantly higher inertness to thermoelectric materials. Humans are currently facing complex challenges such as rising energy costs, pollution and global warming. To reduce their consequences, scientists are concentrating on improving power generators focused on energy harvesting. Thermoelectric generators (TEGs) have demonstrated their ability to convert thermal energy directly into electricity through the Seebeck effect. Due to the unique advantages, they present, thermoelectric systems have emerged over the past decade as a promising alternative among other technologies for the production of clean energy. [1-11]. Switching is the most time-consuming and responsible operation in the manufacture of thermoelectric modules. In them, which include a significant number of junctions, failures most often occur due to broken contacts [2-8]. To prevent the harmful effects of internal mechanical stresses, in the manufacture of thermoelectric batteries, it is necessary to use a damping layer between the branch and the connecting plate [3-14]. The damping layer is made of a material with sufficient plasticity and low ohmic resistance. It is usually made from lead. The results of the research showed the advantages of using a single -wire technology for soldering with Pb - Sb eutectic solder using an anti -diffusion layer of chemically deposited nickel. In this case, the eutectic solder Pb - Sb in the contact simultaneously performs the role of a damper and a switching solder.
{"title":"Study of diffusion processes in contact areas of thermocouples with metals","authors":"E. O. K., M. A. T.","doi":"10.5897/ijps2022.5017","DOIUrl":"https://doi.org/10.5897/ijps2022.5017","url":null,"abstract":"Diffusion processes on the contact areas of the metal-solder-semiconductor system are experimentally studied in this work. Diffusion coefficients, activation energies and pre-exponential factors in samples commutated with solders based on Pb-Sb are determined. It has been established that lead-based solder has a significantly higher inertness to thermoelectric materials. Humans are currently facing complex challenges such as rising energy costs, pollution and global warming. To reduce their consequences, scientists are concentrating on improving power generators focused on energy harvesting. Thermoelectric generators (TEGs) have demonstrated their ability to convert thermal energy directly into electricity through the Seebeck effect. Due to the unique advantages, they present, thermoelectric systems have emerged over the past decade as a promising alternative among other technologies for the production of clean energy. [1-11]. Switching is the most time-consuming and responsible operation in the manufacture of thermoelectric modules. In them, which include a significant number of junctions, failures most often occur due to broken contacts [2-8]. To prevent the harmful effects of internal mechanical stresses, in the manufacture of thermoelectric batteries, it is necessary to use a damping layer between the branch and the connecting plate [3-14]. The damping layer is made of a material with sufficient plasticity and low ohmic resistance. It is usually made from lead. The results of the research showed the advantages of using a single -wire technology for soldering with Pb - Sb eutectic solder using an anti -diffusion layer of chemically deposited nickel. In this case, the eutectic solder Pb - Sb in the contact simultaneously performs the role of a damper and a switching solder.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"59 25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77082045","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}
{"title":"Using vertical electrical sounding and 2D resistivity tomography to investigate Osogbo central waste dumpsite, Osun State, Nigeria","authors":"C. Chukwudi, M. A. M. Shukwunweizu","doi":"10.5897/ijps2022.5020","DOIUrl":"https://doi.org/10.5897/ijps2022.5020","url":null,"abstract":"","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"249 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82906484","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}
C. A. Chinaza, D. Dominic, U. Mbamara, Chijioke Amakom
{"title":"Indoor ionizing radiation measurement in different departments of the Federal University of Technology Owerri","authors":"C. A. Chinaza, D. Dominic, U. Mbamara, Chijioke Amakom","doi":"10.5897/ijps2022.4989","DOIUrl":"https://doi.org/10.5897/ijps2022.4989","url":null,"abstract":"","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76989206","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}
{"title":"Performance comparison of diversity techniques with Addictive White Gaussian Channel (AWGC) in free space optical communication (FSO) under atmospheric turbulence scenario","authors":"O. Ayeni, J. Ojo, P. Owolawi, M. Ajewole","doi":"10.5897/ijps2020.4896","DOIUrl":"https://doi.org/10.5897/ijps2020.4896","url":null,"abstract":"","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88095858","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}
{"title":"Design of a low-cost electronic board for monitoring photovoltaic systems","authors":"Alioune Dia Pape, Ndiaye Ababacar","doi":"10.5897/ijps2022.4999","DOIUrl":"https://doi.org/10.5897/ijps2022.4999","url":null,"abstract":"","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89822543","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}
An integrated geoelectrical study combining electrical resistivity tomography (ERT) and induced polarization (IP) have been used to delineate potential zones of Lead-Zinc mineralization in Umuobuna, Uburu, Ohaozara local government area, southeastern Nigeria. The wenner array configuration was used to acquire resistivity and induced polarization data sets along three traverses of approximate length of 1 km each and spacing of 5 to 25 m, using ABEM Terrameter SAS 1000. The profiles were inverted using RES2DINV software for 2D imaging to delineate possible zones of Pb-Zn mineralization and the geological structures at selected locations in the study area. The ERT surveys were carried out along the IP lines for comparison of anomalies across the profiles. The potential zones of Pb-Zn mineralization display contrasting values of resistivity and chargeability along the traverses. Resistivity values ranging from 7.53 to 7525 Ωm and corresponding chargeability values of between -15.6 and 354 ms, respectively were encountered at some intervals along the traverses. These zones occur at width range 19.5 to 74.5 m and depths of between 0.9 and 15.5 m. Having a low to moderate resistivity and a corresponding high chargeability values at similar width range may be suggestive of Pb-Zn mineralization and test drilling is needed at the anomalous sites for confirmation
{"title":"Delineation of potential zones of lead-zinc mineralization in Uburu Ohaozara L.G.A South Eastern Nigeria, using electrical resistivity tomography and induced polarization methods","authors":"C. Chukwudi, C. I. Ifunanya","doi":"10.5897/ijps2022.5013","DOIUrl":"https://doi.org/10.5897/ijps2022.5013","url":null,"abstract":"An integrated geoelectrical study combining electrical resistivity tomography (ERT) and induced polarization (IP) have been used to delineate potential zones of Lead-Zinc mineralization in Umuobuna, Uburu, Ohaozara local government area, southeastern Nigeria. The wenner array configuration was used to acquire resistivity and induced polarization data sets along three traverses of approximate length of 1 km each and spacing of 5 to 25 m, using ABEM Terrameter SAS 1000. The profiles were inverted using RES2DINV software for 2D imaging to delineate possible zones of Pb-Zn mineralization and the geological structures at selected locations in the study area. The ERT surveys were carried out along the IP lines for comparison of anomalies across the profiles. The potential zones of Pb-Zn mineralization display contrasting values of resistivity and chargeability along the traverses. Resistivity values ranging from 7.53 to 7525 Ωm and corresponding chargeability values of between -15.6 and 354 ms, respectively were encountered at some intervals along the traverses. These zones occur at width range 19.5 to 74.5 m and depths of between 0.9 and 15.5 m. Having a low to moderate resistivity and a corresponding high chargeability values at similar width range may be suggestive of Pb-Zn mineralization and test drilling is needed at the anomalous sites for confirmation","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82398620","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}
S. Mahamadi, Ousséni Fabrice Ouedraogo Pegdwindé, Ouedraogo Adama, Zida Lamine, Zoungrana Martial, Zerbo Issa
Studies on concentrated light influence do not take into account the effect of the heating and this proves to be harmful on photovoltaic parameters. The main purpose of this work is to study the effects of light concentration and the heating caused by this concentration on intrinsic properties and carrier density profile. A thermal model of the PV cell is proposed. By applying the power balance at the steady-state, the PV cell thermal equation is determined. The resolution of this equation leads to temperature profile which shows a rapid increase with light concentration. The mobility n and diffusion n D coefficients of electrons increase to reach their maxima, respectively
{"title":"Uncooled PV cell under variable light concentration: Determination of profiles of the temperature, the intrinsic properties and the carrier density","authors":"S. Mahamadi, Ousséni Fabrice Ouedraogo Pegdwindé, Ouedraogo Adama, Zida Lamine, Zoungrana Martial, Zerbo Issa","doi":"10.5897/ijps2022.5010","DOIUrl":"https://doi.org/10.5897/ijps2022.5010","url":null,"abstract":"Studies on concentrated light influence do not take into account the effect of the heating and this proves to be harmful on photovoltaic parameters. The main purpose of this work is to study the effects of light concentration and the heating caused by this concentration on intrinsic properties and carrier density profile. A thermal model of the PV cell is proposed. By applying the power balance at the steady-state, the PV cell thermal equation is determined. The resolution of this equation leads to temperature profile which shows a rapid increase with light concentration. The mobility n and diffusion n D coefficients of electrons increase to reach their maxima, respectively","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81215008","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}
Purpose: The study is on the influencing factors of domestic solid waste management in Abuja targeted at investigating and studying the factors influencing domestic solid waste management in Abuja, Historically, the amount of wastes generated by human population was insignificant mainly due to the low population densities, coupled with the fact that there was very little exploitation of natural resources. The problem associated with the management of solid waste in most urban cities in Nigeria, like Abuja, does not completely appear to be a problem of absence of legislative framework for solid waste management owing to the fact that at Federal, States, and Local governments levels, there exist some form of sanitation legislations or the other, but some other factors have come to play with the crises experienced in the management of wastes in the Nigerian urban centers. Methodology: The research procedures involve the following: research design, population of the study, sample and sampling techniques, instrumentation, validation of the instrument, administration of the instrument and data analysis techniques. Findings: The result of the study to determine the social factor affecting the management of domestic waste: Location have great effect on waste management, not that everyone should leave in that location, but amenities available in that location should be considered in other locations too. There’s is inadequate waste bin located across the location of study. To determine the economic factor affecting the management of domestic waste: The key economic factor affecting waste management is the poor economy of the nation. Poor or bad technological concept lack of facilities, insufficient man power and more affect the waste management. To determine the natural factors affecting household waste management in Abuja: Top on the natural factor that affects solid waste management in Abuja is the wind, topography and flooding. Which made the management of this waste difficult by the waste management companies. Rain have a slight stand out as during rainy seasons waste management team don’t go into all sessions to extract waste. Unique contribution to theory, practice and policy: Further finding solving the research questions shows that the social status of Abuja residence affects the disposal of waste. The lack of finance or poor economic condition result to poor waste management. Some natural element has significance on waste management in Abuja. Some other factor that have significant effect on household waste management, e.g. corruption, bad economy, lack of sensitization and lack of funds. Furthermore, waste reuse will not be out of place hence the territory moves closer to a zero waste level, where all said waste are recycled and reused by the host communities.
{"title":"Study of Influencing Factors of Domestic Solid Waste Management in Federal Capital Territory, Abuja","authors":"F. Umar, T. C. Ogwueleka, A. Busari","doi":"10.47941/jps.1145","DOIUrl":"https://doi.org/10.47941/jps.1145","url":null,"abstract":"Purpose: The study is on the influencing factors of domestic solid waste management in Abuja targeted at investigating and studying the factors influencing domestic solid waste management in Abuja, Historically, the amount of wastes generated by human population was insignificant mainly due to the low population densities, coupled with the fact that there was very little exploitation of natural resources. The problem associated with the management of solid waste in most urban cities in Nigeria, like Abuja, does not completely appear to be a problem of absence of legislative framework for solid waste management owing to the fact that at Federal, States, and Local governments levels, there exist some form of sanitation legislations or the other, but some other factors have come to play with the crises experienced in the management of wastes in the Nigerian urban centers. \u0000Methodology: The research procedures involve the following: research design, population of the study, sample and sampling techniques, instrumentation, validation of the instrument, administration of the instrument and data analysis techniques. \u0000Findings: The result of the study to determine the social factor affecting the management of domestic waste: Location have great effect on waste management, not that everyone should leave in that location, but amenities available in that location should be considered in other locations too. There’s is inadequate waste bin located across the location of study. To determine the economic factor affecting the management of domestic waste: The key economic factor affecting waste management is the poor economy of the nation. Poor or bad technological concept lack of facilities, insufficient man power and more affect the waste management. To determine the natural factors affecting household waste management in Abuja: Top on the natural factor that affects solid waste management in Abuja is the wind, topography and flooding. Which made the management of this waste difficult by the waste management companies. Rain have a slight stand out as during rainy seasons waste management team don’t go into all sessions to extract waste. \u0000Unique contribution to theory, practice and policy: Further finding solving the research questions shows that the social status of Abuja residence affects the disposal of waste. The lack of finance or poor economic condition result to poor waste management. Some natural element has significance on waste management in Abuja. Some other factor that have significant effect on household waste management, e.g. corruption, bad economy, lack of sensitization and lack of funds. Furthermore, waste reuse will not be out of place hence the territory moves closer to a zero waste level, where all said waste are recycled and reused by the host communities.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88196374","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}
{"title":"Mineralogical evaluation of clay deposits of Nanka formation in parts of South-eastern Nigeria","authors":"C. Chukwudi, A. Benjamin","doi":"10.5897/ijps2022.5011","DOIUrl":"https://doi.org/10.5897/ijps2022.5011","url":null,"abstract":"","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91193557","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}
To better understand the geomagnetic conditions and the particularities of solar cycles 23 and 24, we present analysis from morphological variations of solar and geomagnetic activities parameters IMF-Bz, the interplanetary electric field (E), the proton density (N), Dst (disturbance storm time), Polar cap (PC) indices (PCN and PCS), and geomagnetic activity index aa. The occurrences of the different classes of geomagnetic activity established by Zerbo et al. (2012), through the daily averages of the Aa index are also presented for the period 1996-2019 covering the solar cycle 23 and 24. This investigation reveals: (1) a decrease in solar activity and geomagnetic activity during the last decade; (2) the solar cycle 23 was a magnetically disturbed solar cycle with 41.52% disturbed days versus 72.35% very quiet conditions for the solar cycle 24; (3) the most important numbers of intense and severe storm or magnetic substorm conditions (E, PC index, Dst < -100 nT) are recorded during the solar cycle 23; (4) solar cycle 24 presents similar characteristics as solar cycles 12 and 14 and has also experienced spotless days at its maximum phase; (5) solar cycle 24 experienced low solar activity compared to solar cycle 23. The two solar cycles can be qualified as antagonistic cycles.
{"title":"Solar wind and geomagnetic activity during two antagonist solar cycles: Comparative study between the solar cycles 23 and 24","authors":"Somaïla Koala, Y. Sawadogo, J. Zerbo","doi":"10.5897/ijps2022.4998","DOIUrl":"https://doi.org/10.5897/ijps2022.4998","url":null,"abstract":"To better understand the geomagnetic conditions and the particularities of solar cycles 23 and 24, we present analysis from morphological variations of solar and geomagnetic activities parameters IMF-Bz, the interplanetary electric field (E), the proton density (N), Dst (disturbance storm time), Polar cap (PC) indices (PCN and PCS), and geomagnetic activity index aa. The occurrences of the different classes of geomagnetic activity established by Zerbo et al. (2012), through the daily averages of the Aa index are also presented for the period 1996-2019 covering the solar cycle 23 and 24. This investigation reveals: (1) a decrease in solar activity and geomagnetic activity during the last decade; (2) the solar cycle 23 was a magnetically disturbed solar cycle with 41.52% disturbed days versus 72.35% very quiet conditions for the solar cycle 24; (3) the most important numbers of intense and severe storm or magnetic substorm conditions (E, PC index, Dst < -100 nT) are recorded during the solar cycle 23; (4) solar cycle 24 presents similar characteristics as solar cycles 12 and 14 and has also experienced spotless days at its maximum phase; (5) solar cycle 24 experienced low solar activity compared to solar cycle 23. The two solar cycles can be qualified as antagonistic cycles.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74453019","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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