Pub Date : 2023-08-01DOI: 10.9734/ajopacs/2023/v11i3205
Kh. Kh. Hashimov
In the article, considering the research studies of many scientists and also on the basis of practical applications, the distribution diagram of copper and sulfur atoms in the phase lattice of the crystal, the structure transformation diagram, the elemental lattice hexagonal and crystallographic data were examined and important results were obtained. Analysis of the studies performed shows that some conflicting results in roentgenographic studies on these compounds are related to obtaining these samples by different methods. Our goal is to obtain single crystals of the compounds Cu2-xNi0.05S (x=0.05,0.25,0.30) and draw the lauegrams and debayograms of those crystals. Then the results were analyzed. During the research, it was found that it is possible to buy single crystals of compounds based on the analysis of existing methods and selection of the optimal method. As a result of the research, the suitable lauegrams of the single crystals obtained by the Bridgman method and the microstructures of the samples were determined and the possibilities of application were determined.
{"title":"Synthesis of Cu2-x Ni0.05 S (x=0.05,0.25,0.30) Compounds and Study of Single Crystals","authors":"Kh. Kh. Hashimov","doi":"10.9734/ajopacs/2023/v11i3205","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3205","url":null,"abstract":"In the article, considering the research studies of many scientists and also on the basis of practical applications, the distribution diagram of copper and sulfur atoms in the phase lattice of the crystal, the structure transformation diagram, the elemental lattice hexagonal and crystallographic data were examined and important results were obtained. Analysis of the studies performed shows that some conflicting results in roentgenographic studies on these compounds are related to obtaining these samples by different methods. \u0000Our goal is to obtain single crystals of the compounds Cu2-xNi0.05S (x=0.05,0.25,0.30) and draw the lauegrams and debayograms of those crystals. Then the results were analyzed. \u0000During the research, it was found that it is possible to buy single crystals of compounds based on the analysis of existing methods and selection of the optimal method. As a result of the research, the suitable lauegrams of the single crystals obtained by the Bridgman method and the microstructures of the samples were determined and the possibilities of application were determined.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73901771","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 : 2023-08-01DOI: 10.9734/ajopacs/2023/v11i3206
J. Hossain, S. Monira, M. Shahinuzzaman, Md. Samiul Bari Avick, Md. Shaharul Islam, Mst. Marjia Khatun, S. Razzaque, M. Uddin
A number of textile industries are using different types of dyes which can be a threat to the environment when they are directly exposed without any treatment. The advanced oxidation process (AOP) has become one of the popular methods in which the dye molecules are degraded using microwave irradiation. This method has become popular due to its eco-friendly and cost-efficient characteristics. In this article, the author has reported the degradation of two azo dyes, named methyl orange (MO) and congo red (CR), in the presence of inorganic salts, some additives like charcoal, H2O2, CCl4, tert-butyl alcohol (TBA), glucose and sucrose. A comparative study was conducted to find out the relative degradation rate enhanced by various additives. For both of the dyes, it was found that charcoal was the most effective additive and significantly enhanced the degradation rate mainly due to its high adsorption capability. TBA was found to be the least enhancer. The order of effectiveness based on the irradiation period for MO was 0.01g charcoal > 20 ml NaCl > 20 ml Na2SO4 > 20ml glucose> 10 ml sucrose > 100 μL CCl4 > 200 μL H2O2 > pure MO > TBA. On the other hand, the order of effectiveness for CR for the same condition of irradiation was Combined additives>0.01g charcoal > TBA > 100 μL CCl4> pure CR.
{"title":"Effect of Additives on Decomposition of Methyl Orange and Congo Red Dyes Found in Industrial Wastewater","authors":"J. Hossain, S. Monira, M. Shahinuzzaman, Md. Samiul Bari Avick, Md. Shaharul Islam, Mst. Marjia Khatun, S. Razzaque, M. Uddin","doi":"10.9734/ajopacs/2023/v11i3206","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3206","url":null,"abstract":"A number of textile industries are using different types of dyes which can be a threat to the environment when they are directly exposed without any treatment. The advanced oxidation process (AOP) has become one of the popular methods in which the dye molecules are degraded using microwave irradiation. This method has become popular due to its eco-friendly and cost-efficient characteristics. In this article, the author has reported the degradation of two azo dyes, named methyl orange (MO) and congo red (CR), in the presence of inorganic salts, some additives like charcoal, H2O2, CCl4, tert-butyl alcohol (TBA), glucose and sucrose. A comparative study was conducted to find out the relative degradation rate enhanced by various additives. For both of the dyes, it was found that charcoal was the most effective additive and significantly enhanced the degradation rate mainly due to its high adsorption capability. TBA was found to be the least enhancer. The order of effectiveness based on the irradiation period for MO was 0.01g charcoal > 20 ml NaCl > 20 ml Na2SO4 > 20ml glucose> 10 ml sucrose > 100 μL CCl4 > 200 μL H2O2 > pure MO > TBA. On the other hand, the order of effectiveness for CR for the same condition of irradiation was Combined additives>0.01g charcoal > TBA > 100 μL CCl4> pure CR.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91460702","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 : 2023-07-14DOI: 10.9734/ajopacs/2023/v11i3204
Sandwidi Sayouba, Haro Kayaba, Dabilgou Téré, Sinon Souleymane, S. Oumar, Koulidiati Jean, Béré Antoine
This work concerns the technical study of implementation, thermal and mechanical characterization of a composite material based on clay and plant fibers, in order to meet the need for bioclimatic and sustainable houses. The objective was to find the proportions of clay and fibers to obtain a mixture that would give better thermal properties. A characterization of the thermal properties was made thanks to the KD2 Pro analyzer on samples of various formulas of mixture clay-plant fibers. The results obtained showed that the thermal properties such as thermal conductivity and thermal diffusivity of the clay-fiber mixture samples decrease with the increase of the fiber content in the mixture. Thus, the thermal conductivity of the samples varies from 0.85 to 0.65 W/m.K; from 0.88 to 0.72 W/m.K and from 0.83 to 0.75 W/m.K respectively with Hibiscus cannabinus L. fiber, sawdust and Oryza sativa husk. As for the thermal diffusivity, it varies from 0.37 to 0.25 mm2/s; from 0.45 to 0.30 mm2/s and from 0.47 to 0.27 mm2/s respectively with the addition of Hibiscus cannabinus L. fibers, sawdust and Oryza sativa husk. In sum, the earth samples stabilized with Hibiscus cannabinus L. fibers offer better thermal properties for the construction of bioclimatic houses.
{"title":"Formulation and Thermomechanical Characterization of Earth-based Biosourced Composites: Cases of Clay-Hibiscus cannabinus L. Fiber, Clay-sawdust and Clay- Oryza sativa Husk","authors":"Sandwidi Sayouba, Haro Kayaba, Dabilgou Téré, Sinon Souleymane, S. Oumar, Koulidiati Jean, Béré Antoine","doi":"10.9734/ajopacs/2023/v11i3204","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3204","url":null,"abstract":"This work concerns the technical study of implementation, thermal and mechanical characterization of a composite material based on clay and plant fibers, in order to meet the need for bioclimatic and sustainable houses. The objective was to find the proportions of clay and fibers to obtain a mixture that would give better thermal properties. A characterization of the thermal properties was made thanks to the KD2 Pro analyzer on samples of various formulas of mixture clay-plant fibers. The results obtained showed that the thermal properties such as thermal conductivity and thermal diffusivity of the clay-fiber mixture samples decrease with the increase of the fiber content in the mixture. Thus, the thermal conductivity of the samples varies from 0.85 to 0.65 W/m.K; from 0.88 to 0.72 W/m.K and from 0.83 to 0.75 W/m.K respectively with Hibiscus cannabinus L. fiber, sawdust and Oryza sativa husk. As for the thermal diffusivity, it varies from 0.37 to 0.25 mm2/s; from 0.45 to 0.30 mm2/s and from 0.47 to 0.27 mm2/s respectively with the addition of Hibiscus cannabinus L. fibers, sawdust and Oryza sativa husk. In sum, the earth samples stabilized with Hibiscus cannabinus L. fibers offer better thermal properties for the construction of bioclimatic houses.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86391835","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 : 2023-06-27DOI: 10.9734/ajopacs/2023/v11i3203
B. O., Lulu Briggs, A. Bubu, C. Ononugbo
Measurement of outdoor and indoor background ionizing radiation (BIR) of O.B. Lulu Briggs Health Centre in the University of Port Harcourt, Rivers State, Nigeria was carried out using a well-calibrated Radalert-100 (Radiation meter) and Digilert-200 meters and Global Positioning System (Garmin 765). 30 selected locations were considered. The outdoor and indoor results are as follows respectively, average exposure rates are 0.012±0.001 and 0.013±0.001 mR/h, mean absorbed dose rate (ADR) are 105.6 and 96.28 nGy/h, estimated value of the annual effective dose equivalent (AEDE) are 0.17 and 0.27 mSv/y and mean excess lifetime cancer risk (ELCR) are (0.60 and 0.92) x 10-3. The obtained values for BIR in O.B. Lulu Briggs Health Centre are not above the recommended standard limit of 0.013mR/h by International Commission on Radiological protection (ICRP). AEDE that was calculated in the entire O.B. Lulu Briggs Health Centre is within safe values, the ELCR and the ADR estimated were higher than the world permissible values of 0.29 x 10-3 and 84.0 nGy/h respectively. The calculated dose to organs for O.B. Lulu Briggs showed that the testes have the highest organ dose of (0.140667 and 0.218053) mSv/y for outdoor and indoor respectively.
{"title":"Measurement of Outdoor and Indoor Background Ionizing Radiation of O.B. Lulu Briggs Health Center, University of Port Harcourt, Choba, Rivers State, Nigeria","authors":"B. O., Lulu Briggs, A. Bubu, C. Ononugbo","doi":"10.9734/ajopacs/2023/v11i3203","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3203","url":null,"abstract":"Measurement of outdoor and indoor background ionizing radiation (BIR) of O.B. Lulu Briggs Health Centre in the University of Port Harcourt, Rivers State, Nigeria was carried out using a well-calibrated Radalert-100 (Radiation meter) and Digilert-200 meters and Global Positioning System (Garmin 765). 30 selected locations were considered. The outdoor and indoor results are as follows respectively, average exposure rates are 0.012±0.001 and 0.013±0.001 mR/h, mean absorbed dose rate (ADR) are 105.6 and 96.28 nGy/h, estimated value of the annual effective dose equivalent (AEDE) are 0.17 and 0.27 mSv/y and mean excess lifetime cancer risk (ELCR) are (0.60 and 0.92) x 10-3. The obtained values for BIR in O.B. Lulu Briggs Health Centre are not above the recommended standard limit of 0.013mR/h by International Commission on Radiological protection (ICRP). AEDE that was calculated in the entire O.B. Lulu Briggs Health Centre is within safe values, the ELCR and the ADR estimated were higher than the world permissible values of 0.29 x 10-3 and 84.0 nGy/h respectively. The calculated dose to organs for O.B. Lulu Briggs showed that the testes have the highest organ dose of (0.140667 and 0.218053) mSv/y for outdoor and indoor respectively.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82371924","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 : 2023-06-23DOI: 10.9734/ajopacs/2023/v11i3201
Souleymane Sinon, Salifou Tera, O. Sanogo, Sayouba Sandwidi, B. Korgo, S. Kam
This paper presents a study of the thermal performance of a solar air collector used to heat the drying air of a fruit and vegetable dryer. The prototype collector could be a viable solution to improve energy efficiency and food security in Burkina Faso and other developing countries, by contributing to the reduction of post-harvest losses and the increase of income for local agricultural producers. The collector is first realized by using black painted cans as air ducts, perforated to increase turbulence, and a glass covering the collection surface. After realization, the collector is connected to the dryer and a measurement campaign is conducted to evaluate the thermal performance of it. The measured parameters are the sunshine and the air temperature by keeping the air speed fixed at 0.3 m/s. The analysis of the results shows an important variation of the air temperature difference going from 0.1°C to 74.4°C, between the inlet and the outlet of the collector for an irradiation which varies between 142 W/m2 and 837 W/m2. The black painted surface of the air ducts as well as the increase in turbulence contributed to improve the efficiency of the collector which varies between 0.94% and 50.68% and allowing to record air temperatures ranging from 27.2°C to 69.2°C inside the dryer. This temperature range is favorable for the drying of most food products.
{"title":"Experimental Investigation for Augmentation of Thermal Performance of Solar Air Collector","authors":"Souleymane Sinon, Salifou Tera, O. Sanogo, Sayouba Sandwidi, B. Korgo, S. Kam","doi":"10.9734/ajopacs/2023/v11i3201","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3201","url":null,"abstract":"This paper presents a study of the thermal performance of a solar air collector used to heat the drying air of a fruit and vegetable dryer. The prototype collector could be a viable solution to improve energy efficiency and food security in Burkina Faso and other developing countries, by contributing to the reduction of post-harvest losses and the increase of income for local agricultural producers. The collector is first realized by using black painted cans as air ducts, perforated to increase turbulence, and a glass covering the collection surface. After realization, the collector is connected to the dryer and a measurement campaign is conducted to evaluate the thermal performance of it. The measured parameters are the sunshine and the air temperature by keeping the air speed fixed at 0.3 m/s. The analysis of the results shows an important variation of the air temperature difference going from 0.1°C to 74.4°C, between the inlet and the outlet of the collector for an irradiation which varies between 142 W/m2 and 837 W/m2. The black painted surface of the air ducts as well as the increase in turbulence contributed to improve the efficiency of the collector which varies between 0.94% and 50.68% and allowing to record air temperatures ranging from 27.2°C to 69.2°C inside the dryer. This temperature range is favorable for the drying of most food products.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85454365","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 : 2023-06-23DOI: 10.9734/ajopacs/2023/v11i3202
S. Ouédraogo, Augustin S. Zongo, J. Nzihou, T. Daho, A. Béré
The objective of our study is to numerically and experimentally simulate the CPC operation according to three different values of the mirror reflectance coefficient. The study not only showed the importance of mirror reflectance in the performance of solar collectors but also estimated which of these three values fits well with the reality in the city of Ouagadougou. The thermal exchanges that took place in the CPC were presented. A matlab program was developed for the calculation and simulation of the different parameters of the solar concentrator. The differential equations governing the heat transfers in the different components of the device were discretized by the advanced finite difference method. They were solved by the Gauss-Seidel method. As for the experimental part, it consisted in the direct measurement of the global solar radiation, of the ambient temperature and of the fluid temperature by means of thermocouples placed on the different parts of the sensor. The experimental values are directly recorded with a datalogger. A statistical study was made using some indicators like coefficient of determination of R2 , root mean square error (RMSE) and percentage of mean absolute error (MAPE). A validation of the obtained results by comparing the calculated values with the experimental values was presented. The results show that among the three values of the reflectance coefficient, the best results on the temperature of the fluid are obtained with the reflectance coefficient equal to 0.68 on the site of Ouagadougou.
{"title":"Influence of the Mirror Reflectance Coefficient on the Performance of the Compound Parabolic Trough Concentrator (CPC): Numerical and Experimental Simulation in a Sahelian Environment","authors":"S. Ouédraogo, Augustin S. Zongo, J. Nzihou, T. Daho, A. Béré","doi":"10.9734/ajopacs/2023/v11i3202","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i3202","url":null,"abstract":"The objective of our study is to numerically and experimentally simulate the CPC operation according to three different values of the mirror reflectance coefficient. The study not only showed the importance of mirror reflectance in the performance of solar collectors but also estimated which of these three values fits well with the reality in the city of Ouagadougou. The thermal exchanges that took place in the CPC were presented. A matlab program was developed for the calculation and simulation of the different parameters of the solar concentrator. The differential equations governing the heat transfers in the different components of the device were discretized by the advanced finite difference method. They were solved by the Gauss-Seidel method. As for the experimental part, it consisted in the direct measurement of the global solar radiation, of the ambient temperature and of the fluid temperature by means of thermocouples placed on the different parts of the sensor. The experimental values are directly recorded with a datalogger. A statistical study was made using some indicators like coefficient of determination of R2 , root mean square error (RMSE) and percentage of mean absolute error (MAPE). A validation of the obtained results by comparing the calculated values with the experimental values was presented. The results show that among the three values of the reflectance coefficient, the best results on the temperature of the fluid are obtained with the reflectance coefficient equal to 0.68 on the site of Ouagadougou.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72943118","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 : 2023-05-31DOI: 10.9734/ajopacs/2023/v11i2200
C. Emeruwa, E. J. Oduobuk
Using propagation models helps with communication system planning and maximizes the use of the radio spectrum, a limited natural resource. Here is a comparative analysis between some propagation models and actual measurements from Yenagoa, Southern Nigeria. Electric field strength measurements made during drive tests for two television transmitters operating at 210.25 MHz and 577.10 MHz make up the experimental data. Analytical comparisons were made between verified predictions for the free space, Okumura, and Hata models and measured data. The results demonstrate that these empirical models fail to take into account Yenagoa's actual terrain profile for television broadcast. The Okumura model is the best fit, with ideal values for root mean square error (RMSE) of 34.9136 and 33.2841 and average relative error of 0.13212 and 0.4327 for 210.25 MHz and 577.10 MHz, respectively. However, if the Okumura model is tailored for Yenagoa to improve electric field strength prediction and coverage estimation, better results can be attained.
{"title":"Analytical Comparison of Path Loss Models for Radio Wave Propagation over Yenagoa–Southern Nigeria","authors":"C. Emeruwa, E. J. Oduobuk","doi":"10.9734/ajopacs/2023/v11i2200","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i2200","url":null,"abstract":"Using propagation models helps with communication system planning and maximizes the use of the radio spectrum, a limited natural resource. Here is a comparative analysis between some propagation models and actual measurements from Yenagoa, Southern Nigeria. Electric field strength measurements made during drive tests for two television transmitters operating at 210.25 MHz and 577.10 MHz make up the experimental data. Analytical comparisons were made between verified predictions for the free space, Okumura, and Hata models and measured data. The results demonstrate that these empirical models fail to take into account Yenagoa's actual terrain profile for television broadcast. The Okumura model is the best fit, with ideal values for root mean square error (RMSE) of 34.9136 and 33.2841 and average relative error of 0.13212 and 0.4327 for 210.25 MHz and 577.10 MHz, respectively. However, if the Okumura model is tailored for Yenagoa to improve electric field strength prediction and coverage estimation, better results can be attained.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77067060","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 : 2023-05-27DOI: 10.9734/ajopacs/2023/v11i2199
M. Onwuka, G. Avwiri, C. Ononugbo
Evaluation of Radionuclide contents of suspended particulate matter from two quarry sites in Nigeria, have been carried out using High Volume air sampler and Gamma ray spectrometer NaI (Tl) Detector. The results obtained showed the mean value for 226 Ra, 232Th and 40k for Ishiagu sampleswere 2.76, 1.57 and 5.29 Bq/Kg respectively while that obtained in Okpella sampleswere 1.84, 2.21 and 6.2 Bq/kg respectively. The values obtained were higher than their control values but lower than the world recommended safe values. The results obtained in Okpella are slightly higher than that obtained in Ishiagu sites. This could be due to different geological constituents and other mining activities going on at Okpella that might have contributed to the slight change. All the radiological health risk parameter estimated were within their safe values as recommended by UNSCEAR. Comparison of results with other similar works shows positive correlation. We therefore conclude that inhalable suspended particulate matter within quarry sites does not constitute immediate radiological health hazard though precaution should be taken to avoid long term accumulation that can lead to stochastic health risk.
{"title":"Evaluation of Radionuclide Concentration in Suspended Particulate Matter from Two Quarry Sites in Nigeria","authors":"M. Onwuka, G. Avwiri, C. Ononugbo","doi":"10.9734/ajopacs/2023/v11i2199","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i2199","url":null,"abstract":"Evaluation of Radionuclide contents of suspended particulate matter from two quarry sites in Nigeria, have been carried out using High Volume air sampler and Gamma ray spectrometer NaI (Tl) Detector. The results obtained showed the mean value for 226 Ra, 232Th and 40k for Ishiagu sampleswere 2.76, 1.57 and 5.29 Bq/Kg respectively while that obtained in Okpella sampleswere 1.84, 2.21 and 6.2 Bq/kg respectively. The values obtained were higher than their control values but lower than the world recommended safe values. The results obtained in Okpella are slightly higher than that obtained in Ishiagu sites. This could be due to different geological constituents and other mining activities going on at Okpella that might have contributed to the slight change. All the radiological health risk parameter estimated were within their safe values as recommended by UNSCEAR. Comparison of results with other similar works shows positive correlation. We therefore conclude that inhalable suspended particulate matter within quarry sites does not constitute immediate radiological health hazard though precaution should be taken to avoid long term accumulation that can lead to stochastic health risk.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77784527","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 : 2023-04-19DOI: 10.9734/ajopacs/2023/v11i2198
Lijun Wang, Dong Sun, X. Hua, Daqing Liu
Using the fluid dynamics model, we studied the formation of graphene surface plasma when the charge is tilted to the graphene sheet for motion. We calculated the electron energy loss spectrum of electrons at different angles and proved that the resonance in the spectrum is related to the frequency of graphene surface plasma, as the electron velocity decreases, the dispersion shifts to higher energies. An increase in the tilt angle will also shift the dispersion energy in a higher range.
{"title":"Energy Losses by the Interaction of Charged Particles with a Graphene Sheet","authors":"Lijun Wang, Dong Sun, X. Hua, Daqing Liu","doi":"10.9734/ajopacs/2023/v11i2198","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i2198","url":null,"abstract":"Using the fluid dynamics model, we studied the formation of graphene surface plasma when the charge is tilted to the graphene sheet for motion. We calculated the electron energy loss spectrum of electrons at different angles and proved that the resonance in the spectrum is related to the frequency of graphene surface plasma, as the electron velocity decreases, the dispersion shifts to higher energies. An increase in the tilt angle will also shift the dispersion energy in a higher range.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81326052","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 : 2023-04-14DOI: 10.9734/ajopacs/2023/v11i2196
B. Eze, N. A. Akonjom, A. Bassey
As monitoring preclinical MRI is essential, it is important that the equipment used must be MRI-compatible. This is because interaction with an MRI radiofrequency (RF) transmitting field can cause RF burns due to inappropriate equipment. And non-compatible MRI monitoring equipment can give inaccurate readings in the MRI system if the equipment has ferromagnetic components. Preclinical MRI is designed for animals, the model used to study diseases related to humans. Animal models are imaged using a smaller scanner with high magnetic fields like the 4.7T. The main parameters of interest are the respiratory rate, the temperature, the pressure transducer and the electrocardiogram (ECG), this is because the animal model is used as a laboratory experiment for human disease. An MRI-compatible lead Ⅱ ECG simulator, with approximately 0.5 mV output amplitude was attached to the input of the ECG preamplifier to represent a small animal’s signal. The transmitted signal is the ECG, the pressure sensor, the temperature, and the battery (voltage), these are all linked to different channels (outside, near and inside magnet) and were acquired with the pressure sensor pad taped on a male adult volunteer’s thumb to record the human pulse of 70 bpm, which is similar to the respiration rate of an anaesthetized mouse or rat. The use of a signal gating generator should be explored in future work, this could make the monitoring parameters to be independent of the RF pulse influence. Finally, fibre optics should be included in the design process.
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