Open Academic Journal of Advanced Science and Technology最新文献

{"title":"Study, Development and Application of a Prosthetic Foot for a Transtibial Amputation of Traumatic Etiologic","authors":"J. Alvarinho, Jose Pedro Fulgencio, N. Domingues","doi":"10.33094/oajast.v6i1.632","DOIUrl":"https://doi.org/10.33094/oajast.v6i1.632","url":null,"abstract":"In Portugal, the evolution of the number of amputations up to the present day has increased, with 553 annual transtibial amputations and 958 annual transfemoral amputation. Therefore, based on the limitations of current conventional prosthetic feet and the needs of their users, this dissertation gave rise to an alternative prosthetic foot for the extremity of the lower limb. This prosthetic foot presents an alternative as it uses low-cost mechanisms and materials. Therefore, the main objective of this study is to develop a prosthetic foot for a population with physical limitations. Initially, a model was designed in Solidworks software and later made 3 simulations in Ansys 2021 software in which each simulation was made with a different material: Onyx; Onyx + Carbon Fibers, and finally, Aluminium. In the simulations, a weight on the foot of a person weighing 90 kg was simulated and the deformations caused, the equivalent stress and the cutting stress were studied in order to determine which design is most suitable for the manufacture of the prosthetic foot. However, the estimated deformations in all studies do not take into account the distribution of the load by filling the printed part. Therefore, deformations in actual tests should be considerably lower.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128570664","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":"Impact of Nitrogen Fertilizer use on Soil Ecosystem Integrity in the Greater Port Harcourt Region, Nigeria","authors":"Wanjala, Mp, Odokuma, L, E. I., Ramkat, R, Odogwu, Ba, Boadu, Ko, K. E.J","doi":"10.33094/5.2017.2021.51.1.12","DOIUrl":"https://doi.org/10.33094/5.2017.2021.51.1.12","url":null,"abstract":"Fertilizers are used in agriculture to increase crop yields, but if they are misused, they can harm the integrity of soil ecosystems. The study's aim was to look at the impact of inorganic fertilizers on soil microbial populations in selected soils in the Greater Port Harcourt Area using Lethal Concentration 50 (LC50). The results revealed that the use of inorganic fertilizer altered soil microbial characteristics in three different settings: agricultural, urban, and industrial. For agricultural areas the maximum NPKB mean value was 0.70±0.76 ppm which was higher than the mean value of the control location of 0.23±0.00 ppm. In the agricultural area, UREA tolerant fungi had a lower LC50 mean value (0.43±0.09 ppm) than the control, which had a mean value of 0.46±0.00 ppm. The mean values in the industrial and urban areas were significantly different (p = 0.001). This study concluded that applying UREA and NPK fertilizers to study area soils lowered the pH of soils in agricultural sites (A1, A2, and A3). Fertilizer use in the study areas increased the population of microorganisms at threshold concentrations but was harmful at concentrations of 1.50 % or higher. Furthermore, findings revealed that microorganisms were more tolerant to fertilizers in agricultural areas (higher LC50 values) than in urban and industrial areas (lower LC50 values). According to the findings of this study, fertilizers used in the study areas were linked to soil microorganisms developing tolerance to NPK and UREA. Farmers should use the recommended amounts of fertilizer to ensure the soil ecosystem's integrity.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127076982","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":"Optimizing the Instrument of Biotechnology in Reducing Climate Change Induced Food Insecurity in Nigeria","authors":"J. C. Ajadike, Ogbu Okonkwo Simeon","doi":"10.33094/5.2017.2019.32.17.23","DOIUrl":"https://doi.org/10.33094/5.2017.2019.32.17.23","url":null,"abstract":"This paper reviews inhibiting factors which climate change places on Nigerian agricultural productivity and food security. Nigeria's agriculture and food security is more than 90 percent dependent on weather and climate elements, especially precipitation (rainfall), humidity, wind and evapo-transpiration. Climate change and climate variability are now happening, and they tend to exacerbate such extreme meteorological events as droughts, floods, heat waves and storms. These extreme weather events are not only intensifying but are also occurring more frequently in many parts of Nigeria. These extreme events are very inimical to agriculture and the food security of Nigeria. For example, droughts now persist in many parts of Nigeria and farmers have constantly recurring stories of losses in their agricultural productivity. In the more humid southern part of Nigeria, floods and destructive storms now occur more frequently, wreaking havoc; farmers count their losses whenever these events strike. Both the on-set and cessation of rains fall outside the routines long established and taken for granted by farmers for decades. Consequently, climate change has now emerged as one of the key obstacles to the attainment of food security in Nigeria. The good news is that the field, of biotechnology, which is an applied form of biology, has many techniques and processes which can be explored, exploited, optimized and widely adopted for improving Nigeria's agriculture and enhancing her food security, especially in this era of climate variability and change. This paper discusses these processes and techniques in full.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129562494","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":"Effect of Different Levels of Phosphorus on the Growth and Yield of Tea","authors":"S. Islam, F. S. Hamid, Q. Zaman, Basharat Hussain Shah, F. Ahmad, H. Shah, Samra Aftab","doi":"10.33094/5.2017.2019.31.11.16","DOIUrl":"https://doi.org/10.33094/5.2017.2019.31.11.16","url":null,"abstract":"To evaluate the role of variable doses of phosphorus on the growth and yield of tea (Camellia sinensis L., variety, Qi-Men), the present study was projected. The experiment was conducted during 2016-17 and repeated during 2017-18 at National Tea and High-value crops Research Institute, Shinkiari. Phosphorus was applied in six variable doses @ 0, 75, 112.5, 150, 187.5 and 225 kg ha-1 as Di-Ammonium Phosphate. Nitrogen and Potassium were applied as basal doses. Nitrogen was applied in the form of Urea @ 225 kg ha-1 while Potassium was applied as Sulphate of Potash @ 75 kg K2O/ha. The full dose of phosphorus and Potassium was applied as basal dose while Nitrogen was applied in three split doses during March, July, September 2017& 2018. The experiment was laid out in Randomized Complete Block Design with 3 replications and six treatments. Plot size was kept as 2 rows 5 meter length and 1.2 meter width. Soil samples were collected before application of fertilizers for physico-chemical characteristics. All agronomic practices were kept uniform and plucking was done manually by keeping four leaves and a bud as standard. Results showed that the application of phosphorus significantly increased plant height, No .of leaves/plant, Leaf Length, No. of branches /plant. Tea was plucked 11 times each year and the total yield of each plot was obtained from the total harvest during 2016-17 & 2017-18. Maximum No. of branches/plant (9, 8), Plant Height (57, 55 cm), No. of Leaves (40, 41) and Leaf Length (17, 17 cm), Fresh leaves yield (5306, 3353 kg/ha), Made tea (1061, 671 Kg/ha) was obtained in treatment T3 respectively when NPK was applied @ 225-150-175 while minimum Plant height (46, 40 cm), No. of leaves/plant (31, 29) Leaf length (12, 11 cm) and No. of branches (6, 5), Fresh leaves yield (3419, 2292 kg/ha), Made tea yield (684, 458 kg/ha) was obtained in control plot (without any fertilizer) during both the years respectively. It was concluded that: 1. Phosphorus may be applied @ 225 kg ha-1 with combination of basal doses of nitrogen @ 245 kg/ha in three split doses and Potassium @ 75 kg K2O/ha to obtain maximum possible yield of tea. 2. Further experiments on different combination of Phosphorus and other major elements like N and K are required for confirmation of results.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123756932","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 Microstrip Monopole Antenna with C-shaped Patch for Multiband Applications","authors":"Ruaa Shallal Abbas Anooz","doi":"10.33094/5.2017.2019.31.6.10","DOIUrl":"https://doi.org/10.33094/5.2017.2019.31.6.10","url":null,"abstract":"In this study, a monopole antenna based on C-shaped microstrip patch for multiband applications has been presented. The projected antenna uses FR-4 substrate and reduced ground plane (defected ground plane) with a compact size of 14 mm × 24 mm. Reception tools parameters have been encoded and inserted by means of CST electromagnetic software package. The simulation consequences of the proposed antenna in terms of S11 responses, gain and radiation patterns are appropriate for Wi MAX, C-band, and WLAN applications for recent communication systems.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124878932","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":"Study of Birth Weight and Post Weaning Growth Rate in Lambs and Kids of Damani Sheep and Damani Goat for Fattening Purpose","authors":"I. Din, Arsalan Khan, M. Rizwan, R. Haq, M. Wazir","doi":"10.33094/5.2017.2019.31.1.5","DOIUrl":"https://doi.org/10.33094/5.2017.2019.31.1.5","url":null,"abstract":"The present study was designed to estimate the birth weights and post weaning growth rate of the male lambs and kids of Damani Sheep and Damani Goats for fattening purpose, respectively, at Livestock Research and Development Station, Paharpur, Dera Ismail Khan. For this purpose, a total of 30 males, including 15 lambs and 15 kids were selected for the study. The animals were raised on local feeding pattern like seasonally cultivated fodder species for grazing (berseem, sorghum, millet etc) and a commercial feed (Shandar wanda) as a supplementary diet. It was found that average birth weights of Damani kids and Damani lambs were 2.71±0.75 and 3.61±0.25 Kg, respectively. Average weaning weights of Damani kids and Damani lambs were 6.50±0.45 and 10.18±0.80 Kg, respectively. Average growth rate of Damani goats for the 4th, 5th, 6th, 7th, 8th and 9th months were 9.16, 12.01, 14.14, 16.30, 18.16 and 23.56, respectively while average growth rate of Damani sheep for the 4th, 5th, 6th, 7th, 8th and 9th months were 13.99, 17.10, 19.86, 22.13, 26 and 30.24, respectively. It was concluded from the study that due to significant (p<0.05) weight gain, the males of Damani sheep and Damani goats can be reared for fattening purpose by the local farmers of Pakistan.","PeriodicalId":276204,"journal":{"name":"Open Academic Journal of Advanced Science and Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122665714","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}