Open Access Journal of Science最新文献

{"title":"Slow death from pollution: potential health hazards from air quality in the mgbede oil fields of southsouth Nigeria","authors":"Clinton-Ezekwe Ijeoma Catherine, Osu Charles, Ezekwe Ifeanyichukwu Clinton, Raimi Morufu Olalekan","doi":"10.15406/oajs.2022.05.00177","DOIUrl":"https://doi.org/10.15406/oajs.2022.05.00177","url":null,"abstract":"Background: Today, pollution is a serious issue that threatens the health of billions of people, weakens the economic security of nations, and is to blame for a significant portion of the world's burden of disease, disability, lost productivity, medical expenses, and costs associated with ecosystem damage and premature death. However, despite their enormous size, these expenses are often hidden and frequently go unnoticed as a result of pollution. This has the effect of preventing the entire costs of pollution from being understood, often going uncounted, and being used to counteract economic arguments which are biased towards pollution control. Objectives: This study investigated air quality in the Mgbede Oil Fields of South-south Nigeria. Methods: Air quality sampling points were selected purposefully to meet the objectives of the study. Portable Real-Time Monitoring Technique was used was used for measurement. Results: From the analysis of air samples, cadmium (0.005-0.008 µg/m3) and lead (0.012ug/m3) were detected within the vicinity of the gas flare. Nickel was in the range <0.002 to 0.014 µg/m3 with highest concentrations in the gas flare area. Total suspended particles were within acceptable limits (120 ug/m3) in all locations with PM10 component above standards in the vicinity of the gas flare (20.6-22.6 ug/m3). Zinc was in the range <0.002 to 0.014 ug/m3 with maximum concentrations around the gas flare site. Although these concentrations are well within the acceptable daily exposure range but could be associated with exacerbations in risks of paediatric asthma. NOx ranged between 0.038-0.058 ug/m3 in the study area and falls above standards (0.04 ug/m3) in over 80% of sampled locations. Highest concentrations (0.058 ug/m3) were found around the flare area. SO2 was only detected at concentrations above acceptable limits within the gas flare site at Ebocha. Conclusion: The study therefore concluded that air quality in the area is not only negatively influenced by continuous gas flaring but occur at levels above acceptable international standards where environmental health could be adversely affected. Relocation of all homesteads within 1km radius of the gas flare with adequate compensation for inhabitants with improvement in healthcare delivery; and the establishment of a special health insurance trust fund for long-term exposure to pollutants from oil producing activities are among recommendations. Additionally, since this public health issue necessitates environmental health policies to reduce air pollution, efforts to battle the massive air pollution issues in the Niger Delta and its environmental quality must be combined by worldwide mitigation.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84214081","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":"The “scientific-meta-ethics”: a science of ethics","authors":"João Carlos Holland de Barcellos","doi":"10.15406/oajs.2022.05.00167","DOIUrl":"https://doi.org/10.15406/oajs.2022.05.00167","url":null,"abstract":"The \"Scientific-Meta-Ethics, or simply SME, to shorten it, is a scientific-philosophic theory that aims to standardize, or rather, to bring ethics and morals into the domain of science, and as a consequence and as a consequence to bring law and justice as well.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84963845","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":"Apply mathematical modeling in steam education at high schools","authors":"Tran Viet Cuong, Le Hong Quang, Tran Trung Tinh","doi":"10.15406/oajs.2020.04.00166","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00166","url":null,"abstract":"In mathematics instruction, mathematical models are one of the powerful tools for promoting effective learning. However, it must be used properly. Teachers need to use mathematical models as part of their teaching methods. STEAM education represents a paradigm shift from a traditional education based on standardized test scores to modern ideas that focus on the valuation of learning process. In essence, we allow our students to be wrong, try many ideas, listen to alternative ideas and create a knowledge base that can be applied to real life. In this paper, the researcher studied the application of modeling in STEAM education projects.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78516887","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":"Nonlinear dynamic response analysis of a pressurized carbon nanotube resting on winklerpasternak foundation using multi-dimensional differential transform method","authors":"A. Yinusa, M. Sobamowo, AO Adelaja, GA Oguntala, S. Salawu","doi":"10.15406/oajs.2020.04.00165","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00165","url":null,"abstract":"The tremendous strength and light weight properties of Carbon nanotubes (CNTs) have fascinated the interest of researchers and scientists towards using CNTs for thermal, chemical, optical, electrical, structural and mechanical applications. This paper presents analytical solutions to the nonlinear dynamic response, shear force and bending moment of such CNTs. The CNT is modeled via thermal elasticity mechanics and Euler-Bernoulli theories. Without linearization, series expansion or omission of any independent variable, the developed nonlinear model that governs the physics of the behaviour of the CNT when excited by the aforementioned external agents is solved using transient differential transform method (TDTM) and verified with an inbuilt numerical scheme in MAPLE16. The results of the generated close form solution in this work are also compared with those of past works and excellent agreements are achieved. The parametric studies revealed that an increase in pressure term increases CNT deflection for any mode while a corresponding increase in the temperature and foundation parameters have an attenuating impact on deflection. Finally, the dynamic study reveals that locations with maximum bending moments are observed to possess minimum shear forces. It is envisaged that this work will enhance the use of CNTs for structural, electrical and mechanical applications.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83088958","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":"A simple theory of earthquakes according to quantum mechanics","authors":"Hasan Hüseyin Erbil","doi":"10.15406/oajs.2020.04.00164","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00164","url":null,"abstract":"Centuries have passed to understand the earthquake, which is a natural phenomenon. Many earthquake theories have been put forward as a result of hundreds of years of observations and theories. Some of these theories have been accepted, and some have not been accepted at all. Important ones of the currently accepted earthquake theories are given by Keiiti Aki and Paul G. Richards in a book published in 1979 and 2009, and cited in references. All these earthquake models contributed by these authors are based on the seismic wave propagation theory. It is based on the fact that seismic waves occur as a result of ruptures, fragmentations, dispersions and sliding of some layers on each other in the earth and the classical spread of these waves. Calculation of earthquake parameters is mostly made with the values obtained by statistical models of observed values. All calculations are based on classical physics laws. In this article, the theory we have given is proposed according to the laws of Quantum Mechanics. Therefore, the calculation of earthquake parameters does not depend on any statistical model. In this proposed new earthquake model, magnitude of the earthquake, its energy that may be released when the earthquake will occur, the depth of the earthquake from the earth surface, and in which regions it may occur on earth can be predicted in advance. This will enable people to take precautions in advance. It appears that quantum mechanics can also be applied to macroscopic physical phenomena.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73764513","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":"Chemistry journals impact factors in web of science (ISI) for 2018: a comparative and novel study","authors":"M. A. Abdulla, B. Banik","doi":"10.15406/oajs.2019.03.00141","DOIUrl":"https://doi.org/10.15406/oajs.2019.03.00141","url":null,"abstract":"This paper has discussed and comprised the impact factors of chemistry journals published by the ISI for the year 2018. This study has identified the quality and rank of chemistry journals (638 E-journals). The impact factor services have provided an overall quality of research output. These data will help the researchers to decide the type of journals in which they like to publish their papers. Our current study will also help researchers to identify papers and the contents that are published in journals that have high impact factors.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85443190","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":"Current physiotherapy approaches in lumbal disc herniation","authors":"Ferhan Soyuer","doi":"10.15406/oajs.2020.04.00163","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00163","url":null,"abstract":"In lumbal disc herniation, physiotherapy and rehabilitation applications should be planned depending on the patient's symptoms. There are various physiotherapy approaches. Therefore, applications should be investigated in terms of patient's suitability for treatment, indications and contraindications. The acute, subacute or chronic stage of the disease should not be overlooked in the treatment program. In this short review, physiotherapy approaches with high evidence value are explained.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76170385","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":"Problems with working with acrylic resins-letter","authors":"Z. Raszewski","doi":"10.15406/oajs.2020.04.00161","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00161","url":null,"abstract":"The aim of this article is to introduce dentists and dental technicians to the possible stages of formation of troubles during the work and the fabrication of removable dentures. Based on 20 years of experience, author would like to share with readers this experiences, thoughts and conversations with various people about acrylic resins. If you have ever had problems such as porosity, discoloration or falling out teeth with a finished acrylic denture, this article will help you to follow through the different stages of work and find out what needs to be corrected and that there is no need to repair a new denture. Conclusion:A necessary condition for the production of a suitable acrylic denture is to strictly follow the manufacturer's recommendations.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85195800","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":"Apparent digestibility of dry matter and apparent digestible energy of native fruits consumed by tepezcuintles (cuniculuspaca) in captivity","authors":"R. Montes-Pérez, Pablo Luis Méndez-Castillo, J. K. Ku Vera","doi":"10.15406/oajs.2020.04.00160","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00160","url":null,"abstract":"Eight adult male tepezcuintles (Cuniculus paca) were subjected to consumption tests of orange fruit (Cítrus sinensis), corn (Zea mays), papaya (Carica papaya) and Huaya (Talisia olivaeformis), to measure the apparent digestibility of dry matter (ADDM) and digestible apparent energy (ADE). The tepezcuintles were fed for periods of seven days with each food. Food consumption and feces production were measured during each period. The results showed that the tepezcuintles presented ADDM values from 81.1 to 97.5% with significant differences (P <0.05) and the ADE was from 74.6 to 92.7%. A simple linear regression model was fitted between ADDM and ADE of the four foods (P <0.05, R2 = 90.76). It is concluded that specimens of C. paca in captivity show high ADDM and ADE through a direct and significant relationship between both, with fruits of the four native plant species.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75755197","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":"Tunneling transmission coefficient from the external electric field barrier","authors":"Hasan Hüseyin Erbil","doi":"10.15406/oajs.2020.04.00159","DOIUrl":"https://doi.org/10.15406/oajs.2020.04.00159","url":null,"abstract":"According to classical physics theories, a moving particle cannot move to an environment with greater potential energy than its total energy during movement. But according to quantum theories, this event is well known. This event is called tunneling. Tunneling is a probability, and it is measured by a transmission coefficient. Correct calculation of this coefficient is very important because very sensitive and important instruments have been developed based on this event, and many events in nature can be explained by tunneling. This coefficient is generally calculated by semi-classical approaches (WKB) and the known formula is an approximate formula. In previous publications, the general transmission coefficient of a potential barrier with arbitrary form is calculated by a simple method without any approximation. The results are applied to calculate the half-life values of the nuclei that emit alpha particles. The half-life values obtained from our calculations and the classical method (WKB) have been compared, and it has been found that the new half-life values are exactly consistent with the experimental values. In this article, this general transmission coefficient is applied to calculate transmission coefficient for an arbitrary form external electrical field barrier (cold emission by the metal). The values obtained from our calculations and those of classical method (WKB) have been compared.","PeriodicalId":19581,"journal":{"name":"Open Access Journal of Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81586021","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}