American journal of engineering, science and technology最新文献_第3页

A Dynamic Graph-Based Systems Framework for Modeling, and Control of Cyber-Physical Systems Typified by Buildings 以建筑为代表的信息物理系统建模与控制的动态图系统框架

American journal of engineering, science and technology Pub Date : 2021-10-19 DOI: 10.15864/ajse.2102

Fadel M. Lashhab

引用次数: 0

Assessing the Impact of Mask Usage on COVID-19 Transmission Using a Computer Simulation 利用计算机模拟评估口罩使用对COVID-19传播的影响

American journal of engineering, science and technology Pub Date : 2021-06-09 DOI: 10.1101/2021.06.08.21258593

R. Lacson, P. Veldkamp, C. Zapanta

{"title":"Assessing the Impact of Mask Usage on COVID-19 Transmission Using a Computer Simulation","authors":"R. Lacson, P. Veldkamp, C. Zapanta","doi":"10.1101/2021.06.08.21258593","DOIUrl":"https://doi.org/10.1101/2021.06.08.21258593","url":null,"abstract":"Background: COVID-19, caused by SARS-CoV-2, is highly contagious and causes substantial morbidity and mortality. Mask usage has been advocated by health professionals to minimize its spread. Thus, it is important to develop a simulation that models SARS-CoV-2 spread in indoor environments to evaluate mask usage effectiveness. Methods: A visual computer simulation was developed with Pygame in Python 3. A virtual indoor supermarket is simulated by a given flow of customers with an initial infection percentage and mask usage percentage who enter, move around, and exit a supermarket with shelves, tables and cashiers to demonstrate a systems dynamic complexity, i.e. nonlinear interactions of system elements over time. A supermarket was simulated with initial infection rates of 5%, 10%, and 20% and mask use percentages of 0%, 25%, 50% 75%, and 100%. The environmental settings (e.g. shelf number and location) and total customers (N=200) were kept constant. Results: The number of infected customers increased as the percentage of mask usage decreased (p < 0.01). At 5% initial infection, almost no infections were observed at 50% mask usage, with a logarithmic best-fit model (R2 = 0.947). At 10% initial infection, the association between mask usage and decrease in number of infections was best fit with a linear model (R2 = 0.924). For 20% initial infection, a quadratic model was the best fit (R2 = 0.934). While a linear model suggests proportional decreases in infection, the quadratic model suggests more significant reductions in infections at higher rates of mask use (i.e. increasing mask usage from 5% to 10% is less impactful than from 65% to 70%). Conclusion: The results suggest that mask usage has a significant impact on decreasing COVID-19 transmission. Ideally, mask usage should be as high as possible to achieve more significant reductions in COVID-19 infections. Various parameters can be adjusted during simulation as we learn more about SARS-CoV-2 to guide policies for minimizing COVID-19 transmission.","PeriodicalId":93409,"journal":{"name":"American journal of engineering, science and technology","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73805131","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}

引用次数: 0

Effect of Eucalyptus Globulus Woodlot Plantation on Selected Soil Physico-Chemical Properties, Wheat Yield in Wogera District, Amhara Region, Ethiopia 埃塞俄比亚阿姆哈拉地区Wogera地区蓝桉林地对土壤理化性质和小麦产量的影响

American journal of engineering, science and technology Pub Date : 2021-06-09 DOI: 10.11648/J.AJSET.20210602.14

Kassegn Asnakew Seyoum, B. Alehegn, Asmamaw Abtew

{"title":"Effect of Eucalyptus Globulus Woodlot Plantation on Selected Soil Physico-Chemical Properties, Wheat Yield in Wogera District, Amhara Region, Ethiopia","authors":"Kassegn Asnakew Seyoum, B. Alehegn, Asmamaw Abtew","doi":"10.11648/J.AJSET.20210602.14","DOIUrl":"https://doi.org/10.11648/J.AJSET.20210602.14","url":null,"abstract":"Currently, a Eucalyptus globule is a common smallholder plantation species in the Wogera district. The species is significantly expanding on marginal and fertile farmlands. The objective is to analyze the effects of Eucalyptus globules woodlots plantation and their directions on selected soil physicochemical properties and yield of wheat crop. Three woodlots with similar site conditions were selected for this particular study. Soil samples were taken at a soil depth of 20 cm in RCBD design with three replications. Soil samples were taken at four directions (East, West, South, and North) of woodlots plantation at five different horizontal distances from the woodlots; the center of the woodlot, 5 m, 10 m, 15 m, and 40 m. For the wheat yield study: quadrates of 1m2 area at each distance within directions were laid for wheat grain yield measurement. The finding indicated that electric conductivity, available phosphorus, cation exchange capacity, soil texture, and exchangeable cations were not significantly different across the different directions and distances, whereas soil bulk density, pH, total nitrogen, organic matter were significantly different. This could be attributed to the high organic matter addition via litter-fall, root biomass, uptake, and return of nutrients from deeper soil profiles under the tree canopies. The biomass and grain yield of wheat were significantly different across distance and direction from the sampled woodlot in increasing trend in all directions, this study recommends Eucalyptus should planting on marginal lands with appropriate distance from croplands about 20m to minimize its effect on crop yields.","PeriodicalId":93409,"journal":{"name":"American journal of engineering, science and technology","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89748214","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}

引用次数: 0

A Software Verification Approach That Complies with DO-178B Certification Rules on UAV’s Flight Control Computer 无人机飞控计算机符合DO-178B认证规则的软件验证方法

American journal of engineering, science and technology Pub Date : 2021-06-09 DOI: 10.11648/J.AJSET.20210602.13

O. Demir, İbrahim Seyfullah Babaarslan

{"title":"A Software Verification Approach That Complies with DO-178B Certification Rules on UAV’s Flight Control Computer","authors":"O. Demir, İbrahim Seyfullah Babaarslan","doi":"10.11648/J.AJSET.20210602.13","DOIUrl":"https://doi.org/10.11648/J.AJSET.20210602.13","url":null,"abstract":"In this paper, the verification approach developed in accordance with the DO-178B certification requirements of the software of the Unmanned Aerial Vehicle’s (UAV) Flight Control Computer (FCC) and the lessons learned from this approach are presented. The software verification process is a process that is used to verify how the aircraft's flight control computer behaves according to specified requirements and is used to verify that it does not produce unexpected results. The paper will first describe the software architecture, and then the types of tests developed in accordance with the software architecture. Then, test levels will be compared according to different testing parameters. Afterwards, the information regarding the management of test cases will be reviewed in detail with their different scenarios. The traceability controls and the importance of using traceability while writing the test cases and how to blend a traceability inside a test case will be explained. The studies on structural coverage analysis will be covered in a different section. This whole process can be made automated. To help automate the process, various tools are used. These tools also need to be tested, meaning they need to be qualified. Section 8 talks about this. Finally, lessons learned from the DO-178B certification process will be presented at the end of the paper.","PeriodicalId":93409,"journal":{"name":"American journal of engineering, science and technology","volume":"79 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87926983","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}

引用次数: 0

Equilibrium and Kinetic Study of the Removal of Cadmium from the Human Blood Plasma Using Dried Allium cepa Biomass 干葱生物质去除人血浆中镉的平衡及动力学研究

American journal of engineering, science and technology Pub Date : 2021-04-30 DOI: 10.11648/J.AJSET.20210602.11

Jibunor Victor Udoka, Maaji Sheba Paul, Nnachi Chima

{"title":"Equilibrium and Kinetic Study of the Removal of Cadmium from the Human Blood Plasma Using Dried Allium cepa Biomass","authors":"Jibunor Victor Udoka, Maaji Sheba Paul, Nnachi Chima","doi":"10.11648/J.AJSET.20210602.11","DOIUrl":"https://doi.org/10.11648/J.AJSET.20210602.11","url":null,"abstract":"The therapeutic importance of Allium cepa has been reported in previous studies. However, little has being known of its efficiency to remove heavy metal from the human blood plasma. Thus this study seeks to investigate the efficiency of Allium cepa biomass in detoxification of Cadmium ions from aqueous solution of human blood plasma in-vitro. The biosorbent was prepared and identified using FTIR which revealed the presence of carbonyl group, amide group, sulphoxide group, ether and aromatic groups. The optimum sorption was investigated and the experimental data revealed an equilibrium pH 4, optimum Cd2+ concentration 70 mgL-1 and optimum biosorbent dose 0.80 g were obtained and used to study the equilibrium sorption rate which occurred at 80 mins with 99.98% removal at ambient temperature. The experimental data fitted Pseudo Second order kinetic as indicated by the correlation coefficient value (R2)=0.9961 with a rate constant K2=0.3730 g.mg-1.min-1. The experimental data conforms to Freundlich isotherm and Jovanovis isotherm, however Freundlich isotherm showed best fit with correlation coefficient (R2)=0.632, sorption capacity (KF)=3.3113 and sorption intensive (n)=1.870. The separation factor of the Langmuir isotherm (RL)=0.0141, which suggests that the overall adsorption process was favourable.","PeriodicalId":93409,"journal":{"name":"American journal of engineering, science and technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88541216","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}

引用次数: 0

Biosorption of Copper and Lead from Human Blood Plasma Using allium cepa 葱对人血浆中铜和铅的生物吸附研究

American journal of engineering, science and technology Pub Date : 2021-03-12 DOI: 10.11648/J.AJSET.20210601.11

Jibunor Victor Udoka, Maaji Paul Sheba, Nnachi Chima, Elebo Abuchi

{"title":"Biosorption of Copper and Lead from Human Blood Plasma Using allium cepa","authors":"Jibunor Victor Udoka, Maaji Paul Sheba, Nnachi Chima, Elebo Abuchi","doi":"10.11648/J.AJSET.20210601.11","DOIUrl":"https://doi.org/10.11648/J.AJSET.20210601.11","url":null,"abstract":"Lead and Copper are inorganic pollutants that are non-biodegradable. When released into the environment, they have adverse effect on human beings and animals when ingested. Allium cepa (Onion) is a vegetable product largely consumed for its potential therapeutic importance. This study investigates the efficacy of Allium cepa in removal of Cu2+ and Pb2+ from human blood plasma in-vitro. The adsorption rate was studied at optimum values of pH 6 for Cu2+, and pH 4 for Pb2+, metal ion concentration (50mgL-1), and Allium cepa dose 0.60g for Cu2+ and 0.40g for Pb2+ at physiological temperature (38°C). SEM analysis revealed physical disintegration in the surface morphology of Allium cepa biomass after adsorption. Equilibrium sorption occurred at80 mins with 99.316% removal for Cu2+ and 90minswith 99.8914% removal for Pb2+. The adsorption data obtained for Cu2+ best fits Temkin isotherm with correlation value (R2)=0.901 with low binding energy (AT)=1.340 Lg-1 while the adsorption data for Pb2+ best fits Freundlich isotherm with correlation values (R2)=0.965 at Freundlich coefficient (kf)=3.169.27 Lmg-1. The result also revealedthat physiosorption and chemosorption occurred between the metal ions and binding site on the Allium cepa biomass as Intraparticle diffusion proved not to be the only rate controlling step.","PeriodicalId":93409,"journal":{"name":"American journal of engineering, science and technology","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90532214","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}

引用次数: 0

Study on the limitations of Stacking Technique for Bandwidth Improvement ofMicrostrip Patch Antennas 提高微带贴片天线带宽的叠加技术局限性研究

American journal of engineering, science and technology Pub Date : 2021-01-01 DOI: 10.15864/ajse.2305

引用次数: 0

Moral-Driven Planning in Simple Automated Narrative Generator 简单自动叙事生成器中的道德驱动计划

American journal of engineering, science and technology Pub Date : 2021-01-01 DOI: 10.15864/ajse.2303

引用次数: 0

Quantum Field Theory on Noncommutative Curved Space-times and Noncommutative Gravity 非对易弯曲时空和非对易引力的量子场论

American journal of engineering, science and technology Pub Date : 2021-01-01 DOI: 10.11648/j.ajset.20210604.11

Subhamoy Singha Roy

引用次数: 0

Study of Behaviors of Multi-Source Rauch Filters 多源Rauch滤波器的行为研究

American journal of engineering, science and technology Pub Date : 2021-01-01 DOI: 10.15864/ajse.2104

引用次数: 0