Pub Date : 2021-09-28DOI: 10.14419/ijbas.v10i2.31741
M. Franco-Camacho, D. J. RamÃrez-Calzada, R. T. Páez-Hernández, D. Ladino-Luna
In this paper it is shown the experimental measurements made of the generated radiation by mobile phones, and the corresponding conclusions when comparing them with the values provided by the manufacturers. The so-called specific absorption rate (SAR) is calculated from the amount of electromagnetic energy emitted by mobile phones and absorbed by the human body. It was found that the measurements obtained are within the allowed values, which suggests that the radio frequency emitted by these mobile phones does not have negative effects on human health. These devices have a SAR value provided by the manufacturers, but such values are not completely reliable However, the possibility that its use may cause other harm to human health is not ruled out. The measurements and experimental results were part of the development of a project at a Public University in Mexico City. Â
{"title":"On the effects of the electromagnetic radiation in human health by using mobile telephone in Mexico","authors":"M. Franco-Camacho, D. J. RamÃrez-Calzada, R. T. Páez-Hernández, D. Ladino-Luna","doi":"10.14419/ijbas.v10i2.31741","DOIUrl":"https://doi.org/10.14419/ijbas.v10i2.31741","url":null,"abstract":"In this paper it is shown the experimental measurements made of the generated radiation by mobile phones, and the corresponding conclusions when comparing them with the values provided by the manufacturers. The so-called specific absorption rate (SAR) is calculated from the amount of electromagnetic energy emitted by mobile phones and absorbed by the human body. It was found that the measurements obtained are within the allowed values, which suggests that the radio frequency emitted by these mobile phones does not have negative effects on human health. These devices have a SAR value provided by the manufacturers, but such values are not completely reliable However, the possibility that its use may cause other harm to human health is not ruled out. The measurements and experimental results were part of the development of a project at a Public University in Mexico City. Â","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80282539","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 : 2021-08-26DOI: 10.53896/IJSBAR.V60I1.13016
Khaerunissa, E. Iskandar, Siti Nurul Aini, Marezka, R. Rahmawati, Gotfridus Goris Seran
The aim of this research is to describe the potential, development approach and policy response for developing the cultural tourism based on the local wisdom in Kampung Adat Urug. Firstly, the potentials of local wisdom developed as cultural tourism include hereditary leadership, custom houses, and customary ceremonies. Secondly, the development of cultural tourism based on local wisdom needs partnership among the public and private sectors and people/community and harnesses collaboration among various stakeholders of three sectors to succeed the local wisdom-based cultural tourism. Thirdly, the policy response to develop the cultural tourism based on the local wisdom is by improving the potentials of local wisdom developed as cultural tourism, strengthening the institutional support, stipulating an integrated part of tourism destination system, and providing the e-tourism information.
{"title":"Cultural Tourism Based on Local Wisdom: Potential, Development Approach and Policy Response","authors":"Khaerunissa, E. Iskandar, Siti Nurul Aini, Marezka, R. Rahmawati, Gotfridus Goris Seran","doi":"10.53896/IJSBAR.V60I1.13016","DOIUrl":"https://doi.org/10.53896/IJSBAR.V60I1.13016","url":null,"abstract":"The aim of this research is to describe the potential, development approach and policy response for developing the cultural tourism based on the local wisdom in Kampung Adat Urug. Firstly, the potentials of local wisdom developed as cultural tourism include hereditary leadership, custom houses, and customary ceremonies. Secondly, the development of cultural tourism based on local wisdom needs partnership among the public and private sectors and people/community and harnesses collaboration among various stakeholders of three sectors to succeed the local wisdom-based cultural tourism. Thirdly, the policy response to develop the cultural tourism based on the local wisdom is by improving the potentials of local wisdom developed as cultural tourism, strengthening the institutional support, stipulating an integrated part of tourism destination system, and providing the e-tourism information.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"120 1","pages":"144-155"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78169336","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 : 2021-08-26DOI: 10.53896/IJSBAR.V60I1.12782
Susana Fonseca, Filipe A. P. Duarte
This article seeks to investigate the vulnerability of the directors of Social Organizations (SO). Specifically, this work intends to characterize the directions of the SO, to understand how the management of these organizations is carried out and, further, to understand their view on the adoption of strategies. Additionally, the organizational culture is characterized. We opted for qualitative methods and used the methodology associated with content analysis to examine the information collected from a sample of SO directors in Vila Nova de Foz Coa, namely, the Residential Structures for the Elderly (RSE), in order to analyze the weaknesses of the directions in the management of these SOs. The results of the case study partially confirm what was predicted in the theory, that is, the SOs are currently faced with several challenges and it is essential to adopt strategies in order to overcome these same challenges. What can be seen is that, although the directors aspire to an efficient and effective service provision, there are several challenges imposed on the directors, calling for the adequacy / improvement of management in the SO. Corroborating the literature, in the study we found that the directions of the SO consider that the increase in competition, the hiring and professionalization of Human Resources (HR), sustainability, the establishment of partnerships and the diversification of funding sources are presented as their own. greatest vulnerabilities. Thus, the managements should seek solutions to face the complexity that involves the management of all organizational processes, attesting that the challenges and requirements of preparing, planning and organizing all resources are great. What has been seen is the adoption of strategic planning at different levels and levels of conducive effectiveness that seek to address the needs of organizations.
本文旨在探讨社会组织董事的脆弱性。具体地说，这项工作旨在描述组织的方向，了解这些组织的管理是如何进行的，并进一步了解他们对采用战略的看法。此外，组织文化的特点。我们选择定性方法，并使用与内容分析相关的方法来检查从Vila Nova de Foz Coa的SO董事样本中收集的信息，即老年人住宅结构(RSE)，以分析这些SO管理方向的弱点。案例研究的结果部分证实了理论中的预测，即SOs目前面临着几个挑战，必须采取策略来克服这些挑战。可以看出，虽然董事们渴望提供有效率和有效的服务，但董事们也面临着一些挑战，这就要求公司的管理是否足够/改善。与文献相佐证的是，在本研究中，我们发现SO的发展方向将竞争的加剧、人力资源的雇佣和专业化、可持续性、伙伴关系的建立和资金来源的多样化视为自己的方向。最大的漏洞。因此，管理层应寻求解决方案，以面对涉及管理所有组织过程的复杂性，证明准备，计划和组织所有资源的挑战和要求是巨大的。所看到的是在不同层次和有效层次上采用战略规划，以寻求解决组织的需要。
{"title":"Nonprofit Organizations: Management Vulnerabilities","authors":"Susana Fonseca, Filipe A. P. Duarte","doi":"10.53896/IJSBAR.V60I1.12782","DOIUrl":"https://doi.org/10.53896/IJSBAR.V60I1.12782","url":null,"abstract":"This article seeks to investigate the vulnerability of the directors of Social Organizations (SO). Specifically, this work intends to characterize the directions of the SO, to understand how the management of these organizations is carried out and, further, to understand their view on the adoption of strategies. Additionally, the organizational culture is characterized. We opted for qualitative methods and used the methodology associated with content analysis to examine the information collected from a sample of SO directors in Vila Nova de Foz Coa, namely, the Residential Structures for the Elderly (RSE), in order to analyze the weaknesses of the directions in the management of these SOs. The results of the case study partially confirm what was predicted in the theory, that is, the SOs are currently faced with several challenges and it is essential to adopt strategies in order to overcome these same challenges. What can be seen is that, although the directors aspire to an efficient and effective service provision, there are several challenges imposed on the directors, calling for the adequacy / improvement of management in the SO. Corroborating the literature, in the study we found that the directions of the SO consider that the increase in competition, the hiring and professionalization of Human Resources (HR), sustainability, the establishment of partnerships and the diversification of funding sources are presented as their own. greatest vulnerabilities. Thus, the managements should seek solutions to face the complexity that involves the management of all organizational processes, attesting that the challenges and requirements of preparing, planning and organizing all resources are great. What has been seen is the adoption of strategic planning at different levels and levels of conducive effectiveness that seek to address the needs of organizations.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"45 1","pages":"156-171"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73775511","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 : 2021-08-21DOI: 10.53896/IJSBAR.V60I1.12993
Carol Sake, J. Tchadji, Georgia Ambada, Loveline N. Ngu, A. Lissom, T. Tchouangueu, L. Djukouo, F. Etoa, G. Nchinda
The impact of antiretroviral naive HIV-1 infection on the modulation of Natural Killer (NK) cells phenotype has not been fully assessed. This study aimed to define the phenotype of NK cell in the context of antiretroviral naive HIV-1 infection. A total of 85 ARV naive HIV-1 infected and 55 healthy individuals were included in the study. Purified NK cells alongside bulk Peripheral Blood Mononuclear Cells (PBMC) were surface stained with fluorochrome conjugated antibodies and samples were acquired using a BD FACS canto II flow cytometer. A down-regulation of CD56 + /CD16 - and CD56 + /CD16 + NK cells (p= 0.003), and a significant expansion (p= 0.03) of CD56 - /CD16 + NK cells subset was observed in ARV naive HIV-1 infection. The high expression of both CD38 (p= 0.02) and HLA-DR (p=0.001) in the CD56-/CD16+ NK cells subset, shows the activation status of NK cells from HIV-1 infected people. A reduced expression of activating markers NKp44 and NKp30 and the down regulation of NKG2A was observed in CD56+/CD16- and CD56+/CD16+ NK cells from HIV-1 infected people (p= 0.006, p= 0.009, respectively). Antiretroviral naive HIV-1 infected people living in Cameroon show a differential modulation of NK cell phenotype relative to HIV negative controls.
{"title":"Natural Killer Cells Phenotype in Antiretroviral Naïve HIV-1 Infected People Living in Cameroon","authors":"Carol Sake, J. Tchadji, Georgia Ambada, Loveline N. Ngu, A. Lissom, T. Tchouangueu, L. Djukouo, F. Etoa, G. Nchinda","doi":"10.53896/IJSBAR.V60I1.12993","DOIUrl":"https://doi.org/10.53896/IJSBAR.V60I1.12993","url":null,"abstract":"The impact of antiretroviral naive HIV-1 infection on the modulation of Natural Killer (NK) cells phenotype has not been fully assessed. This study aimed to define the phenotype of NK cell in the context of antiretroviral naive HIV-1 infection. A total of 85 ARV naive HIV-1 infected and 55 healthy individuals were included in the study. Purified NK cells alongside bulk Peripheral Blood Mononuclear Cells (PBMC) were surface stained with fluorochrome conjugated antibodies and samples were acquired using a BD FACS canto II flow cytometer. A down-regulation of CD56 + /CD16 - and CD56 + /CD16 + NK cells (p= 0.003), and a significant expansion (p= 0.03) of CD56 - /CD16 + NK cells subset was observed in ARV naive HIV-1 infection. The high expression of both CD38 (p= 0.02) and HLA-DR (p=0.001) in the CD56-/CD16+ NK cells subset, shows the activation status of NK cells from HIV-1 infected people. A reduced expression of activating markers NKp44 and NKp30 and the down regulation of NKG2A was observed in CD56+/CD16- and CD56+/CD16+ NK cells from HIV-1 infected people (p= 0.006, p= 0.009, respectively). Antiretroviral naive HIV-1 infected people living in Cameroon show a differential modulation of NK cell phenotype relative to HIV negative controls.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"82 1","pages":"83-103"},"PeriodicalIF":0.0,"publicationDate":"2021-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88211681","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 : 2021-08-13DOI: 10.53896/IJSBAR.V60I1.13013
Alice Geraldine S. Hernando-Pagaling
Carigara Bay is one of the successful fishing areas in the entire Philippines because of its multi-gear fishery system. Filipinos living around the bay consider its marine life as one of the sources of their livelihood. However, the biodiversity and biological importance of phytoplankton are still unexplored as evidenced by the dearth of published data in scientific journals, thus, this study was undertaken. Sampling sites are the freshwater tributaries namely Lindog River [Brgy. Uyawan], Bislig River [Brgy. Bislig] situated in Carigara, Himanglos River [Brgy. Hilaba], Canomantag River [Brgy. Canomantag] in Barugo, stream located in Brgy, Libertad, Capoocan, Caraycaray River [Brgy. Caraycaray], Lipasan falls [Brgy. Pinarigusan] in San Miguel and Tula-an falls [Brgy. Tula-an], Busay falls [brgy. Busay] in Babatngon. Water samples from the sampling sites were collected using a 2.5-3L plexi glass sampler, transferred in three [3] 1L cap bottle and brought in the laboratory for processing. All data were subjected to statistical analyses such as two-way analysis of variance [ANOVA] and Post-hoc test. Culture studies were conducted on selected phytoplankton namely the Asterococcus cf limneticus; Chlorococcum cf humicola; Anabaena cf azollae and Oscillatoria cf limnetica. The species were selected and further subjected to optimization due to their fast-growing ability in a span of time, less bacterial contamination compared with the others and their ability to withstand varying conditions of light, temperature and pH. The four phytoplankton were optimized in terms of light intensities, pH and temperature. Cell density was measured every two days using the haemacytometer method and specific growth rates were computed. Results show that the four phytoplankton have the highest specific growth rates at 40.5 umol m-2 s-1, 250C and pH 7. These measurements form the basis of microalgae cultivation in great quantities for the production of natural food and processing of pharmaceutical and other industry products. The optimized microalgae namely Asterococcus cf limneticus; Chlorococcum cf humicola; Anabaena cf azollae, Oscillatoria cf limnetica have high ash, protein and lipid contents which are vital nutrients for food and supplement development.
{"title":"Culture Studies on Four Selected Phytoplankton Isolated from Freshwater Tributaries Connected to Carigara Bay","authors":"Alice Geraldine S. Hernando-Pagaling","doi":"10.53896/IJSBAR.V60I1.13013","DOIUrl":"https://doi.org/10.53896/IJSBAR.V60I1.13013","url":null,"abstract":"Carigara Bay is one of the successful fishing areas in the entire Philippines because of its multi-gear fishery system. Filipinos living around the bay consider its marine life as one of the sources of their livelihood. However, the biodiversity and biological importance of phytoplankton are still unexplored as evidenced by the dearth of published data in scientific journals, thus, this study was undertaken. Sampling sites are the freshwater tributaries namely Lindog River [Brgy. Uyawan], Bislig River [Brgy. Bislig] situated in Carigara, Himanglos River [Brgy. Hilaba], Canomantag River [Brgy. Canomantag] in Barugo, stream located in Brgy, Libertad, Capoocan, Caraycaray River [Brgy. Caraycaray], Lipasan falls [Brgy. Pinarigusan] in San Miguel and Tula-an falls [Brgy. Tula-an], Busay falls [brgy. Busay] in Babatngon. Water samples from the sampling sites were collected using a 2.5-3L plexi glass sampler, transferred in three [3] 1L cap bottle and brought in the laboratory for processing. All data were subjected to statistical analyses such as two-way analysis of variance [ANOVA] and Post-hoc test. Culture studies were conducted on selected phytoplankton namely the Asterococcus cf limneticus; Chlorococcum cf humicola; Anabaena cf azollae and Oscillatoria cf limnetica. The species were selected and further subjected to optimization due to their fast-growing ability in a span of time, less bacterial contamination compared with the others and their ability to withstand varying conditions of light, temperature and pH. The four phytoplankton were optimized in terms of light intensities, pH and temperature. Cell density was measured every two days using the haemacytometer method and specific growth rates were computed. Results show that the four phytoplankton have the highest specific growth rates at 40.5 umol m-2 s-1, 250C and pH 7. These measurements form the basis of microalgae cultivation in great quantities for the production of natural food and processing of pharmaceutical and other industry products. The optimized microalgae namely Asterococcus cf limneticus; Chlorococcum cf humicola; Anabaena cf azollae, Oscillatoria cf limnetica have high ash, protein and lipid contents which are vital nutrients for food and supplement development.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"231 1","pages":"16-38"},"PeriodicalIF":0.0,"publicationDate":"2021-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75190624","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}
This paper focuses on the dynamics and active control of chemical oscillations governed by a forced generalized Rayleigh oscillator. The Melnikov method is used to analytically determine the critical parameters for the onset of chaotic motions. The analytical results are confirmed by numerical simulations. The bifurcation structures obtained show that the model displays a rich variety of dynamical behaviors and remarkable routes to chaos. The effects of the control gain parameters on the behavior of the system are analyzed and the results obtained have shown the control efficiency.
Pub Date : 2021-03-19DOI: 10.14419/ijbas.v10i1.31431
S. Seddighi Chaharborj, Shahriar S. Chaharborj, Phang Pei See
In dynamics, the Van der Pol oscillator is a non-conservative oscillator with non-linear damping. The problems of single-well, double-well and double-hump Van der Pol-Dufing equations are studied in this paper. The Chebyshev Neural Network (ChNN) model will be applied to obtain the numerical solutions of these types of equations for the first time. The hidden layer is eliminated by expanding the input pattern by Chebyshev polynomials which employs a single layer neural network. In order to modify the network parameters and to minimize the computed error function, a feed forward neural network model with error back propagation principle is used. The obtained numerical results form the ChNN model will be compared with the analytical solutions, namely Homotopy Perturbation Method (HPM), Homotopy Analysis Method (HAM), Differential Transform Method (DTM) and exact. Comparisons of the solutions obtained with existing numerical results show that this method is a capable tool for solving this kind of nonlinear problems.
在动力学中，范德波尔振子是一种具有非线性阻尼的非保守振子。本文研究了单井、双井和双峰Van der Pol-Dufing方程问题。切比雪夫神经网络(ChNN)模型将首次用于求解这类方程的数值解。采用单层神经网络，利用切比雪夫多项式展开输入模式，消除了隐层。为了修正网络参数并使计算误差函数最小，采用了误差反向传播原理的前馈神经网络模型。将从ChNN模型中得到的数值结果与解析解进行比较，即同伦摄动法(HPM)、同伦分析法(HAM)、微分变换法(DTM)和exact。与已有数值结果的比较表明，该方法是求解这类非线性问题的有效工具。
{"title":"Application of Chebyshev neural network to solve Van der Pol equations","authors":"S. Seddighi Chaharborj, Shahriar S. Chaharborj, Phang Pei See","doi":"10.14419/ijbas.v10i1.31431","DOIUrl":"https://doi.org/10.14419/ijbas.v10i1.31431","url":null,"abstract":"In dynamics, the Van der Pol oscillator is a non-conservative oscillator with non-linear damping. The problems of single-well, double-well and double-hump Van der Pol-Dufing equations are studied in this paper. The Chebyshev Neural Network (ChNN) model will be applied to obtain the numerical solutions of these types of equations for the first time. The hidden layer is eliminated by expanding the input pattern by Chebyshev polynomials which employs a single layer neural network. In order to modify the network parameters and to minimize the computed error function, a feed forward neural network model with error back propagation principle is used. The obtained numerical results form the ChNN model will be compared with the analytical solutions, namely Homotopy Perturbation Method (HPM), Homotopy Analysis Method (HAM), Differential Transform Method (DTM) and exact. Comparisons of the solutions obtained with existing numerical results show that this method is a capable tool for solving this kind of nonlinear problems.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77965775","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 : 2021-02-19DOI: 10.14419/IJBAS.V10I1.31377
Y. Abdou, A. Abdelghany, A. El-Gendy, F. A. El-Husseiny
Cobalt doped modified borophosphate glasses similar to Hench’s bioglass were successfully synthesized using gradually increasing cobalt ions in addition to another sample of Co free glass. Synthesized samples were studied for their bioactivity through immersion in phosphate solution for different time intervals. FTIR absorption spectral data were collected before and after immersion for a prolonged time intervals. Spectral data reveals appearance of absorption band at 573 cm-1 Splitted into 565 cm-1 and 603 cm-1 after one week of immersion supporting the bone bonding ability and biocompatibility with bone. The change in the calculated N4 value also indi-cate the conversion of both BO3 and BO4 strutural units associated with the formation of hydroxyapatite. Magnetic characteristics meas-ured and calculated through VSM measurements supporting the idea of using such material as a bioactive material that can be used in hyperthermia treatment. Â
{"title":"Corrosion behavior of borate modified Hench’s bioglasses containing dopant cobalt oxide","authors":"Y. Abdou, A. Abdelghany, A. El-Gendy, F. A. El-Husseiny","doi":"10.14419/IJBAS.V10I1.31377","DOIUrl":"https://doi.org/10.14419/IJBAS.V10I1.31377","url":null,"abstract":"Cobalt doped modified borophosphate glasses similar to Hench’s bioglass were successfully synthesized using gradually increasing cobalt ions in addition to another sample of Co free glass. Synthesized samples were studied for their bioactivity through immersion in phosphate solution for different time intervals. FTIR absorption spectral data were collected before and after immersion for a prolonged time intervals. Spectral data reveals appearance of absorption band at 573 cm-1 Splitted into 565 cm-1 and 603 cm-1 after one week of immersion supporting the bone bonding ability and biocompatibility with bone. The change in the calculated N4 value also indi-cate the conversion of both BO3 and BO4 strutural units associated with the formation of hydroxyapatite. Magnetic characteristics meas-ured and calculated through VSM measurements supporting the idea of using such material as a bioactive material that can be used in hyperthermia treatment.  ","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85174102","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 : 2020-12-23DOI: 10.14419/IJBAS.V9I4.31273
J. Salgado, Sandra García López, Y. G. Luna, R. J. Romero
In this work is established a parametric identification method for an absorption air conditioning solar plant. A scaled thermal plant, consisting of a thermal capacitor and a flow line that acts as a capacitor and thermal energy radiator is used. As the mathematical model of the scaled plant is structurally identical to that of the solar plant the first is used to determine the methodology that can be used later for the identification of the PTC solar plant. Parametric identification is a necessary step that allows to determine the unknown parameters of the mathematical model of any solar/thermal plant. This model then can be used to analyze the plant characteristics and design an appropriate control algorithm. Although the system model is nonlinear it can be expressed in the form of a linear regressor in the parameters. This permits to use the least squares method as the identification method. The method is applied to the thermal plant to identify the useful form that the covariance matrix and excitation signals should have to ensure that when applied to the solar plant its unknown parameters can be properly estimated. Once the solar plant parameters are properly estimated model can be used to analyze and simulate the operation of the absorption air conditioning system.
{"title":"Parametric Identification Method for an Absorption Air Conditioning Parabolic Trough Collector Solar Plant","authors":"J. Salgado, Sandra García López, Y. G. Luna, R. J. Romero","doi":"10.14419/IJBAS.V9I4.31273","DOIUrl":"https://doi.org/10.14419/IJBAS.V9I4.31273","url":null,"abstract":"In this work is established a parametric identification method for an absorption air conditioning solar plant. A scaled thermal plant, consisting of a thermal capacitor and a flow line that acts as a capacitor and thermal energy radiator is used. As the mathematical model of the scaled plant is structurally identical to that of the solar plant the first is used to determine the methodology that can be used later for the identification of the PTC solar plant. Parametric identification is a necessary step that allows to determine the unknown parameters of the mathematical model of any solar/thermal plant. This model then can be used to analyze the plant characteristics and design an appropriate control algorithm. Although the system model is nonlinear it can be expressed in the form of a linear regressor in the parameters. This permits to use the least squares method as the identification method. The method is applied to the thermal plant to identify the useful form that the covariance matrix and excitation signals should have to ensure that when applied to the solar plant its unknown parameters can be properly estimated. Once the solar plant parameters are properly estimated model can be used to analyze and simulate the operation of the absorption air conditioning system.","PeriodicalId":14296,"journal":{"name":"International Journal of Sciences: Basic and Applied Research","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84008012","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 : 2020-11-28DOI: 10.14419/IJBAS.V9I3.31182
E. Horozić, Maida Šljivić Husejnović, Adem Bajrić, M. Ibišević, Enida Karić, Amra Džambić, D. Husejnagić, E. Nurković
In this work, four silver(I) complexes with Schiff bases derived from ninhydrin and selected amino acids (methionine, histidine, cysteine, and phenylalanine) were synthesized. The aim of this study is to determine the potential biological activity of these complexes. FTIR and UV/VIS spectroscopy were used for structural characterization of the products. Antioxidant activity was examined in vitro using DPPH method. Antimicrobial screening was performed by diffusion technique on reference bacterial strains from the ATCC collection. Interaction with bovine serum albumin (BSA) was examined using UV/VIS spectroscopy. Based on the obtained spectral data, it is assumed that all Schiff bases coordinate the Ag(I) ion as a tridentate ONO donor ligand. The antioxidant activity of the synthesized compounds is extremely high, with a range of IC 50 values of 0.023-0.06 mg/mL. Antimicrobial screening determined the inhibitory ability of almost all complexes for concentrations of 1 and 2 mg/mL, with zones of inhibition in the range of 9-19 mm. Examination of the interaction of BSA with Ag(I) complexes revealed the same change in the absorption maximum (hyperchromic shift) in the region of about 205 nm, which indicates that the interaction of BSA and the complex results in conformational changes of BSA.
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