Open Access Original Research Article

Study and Design of a Horizontal Axis Wind Turbine (0.5 kW) Using Software Solid Works

Hagninou E. V. Donnou, Drissa Boro, Jean Noé Fabiyi, Marius Tovoeho, Aristide B. Akpo

Current Journal of Applied Science and Technology, Page 1-17
DOI: 10.9734/cjast/2021/v40i3131546

In the present work, the study and design of a horizontal axis wind turbine suitable for the Cotonou site were investigated on the coast of Benin. A statistical study using the Weibull distribution was carried out on the hourly wind data measured at 10 m from the ground by the Agency for Air Navigation Safety in Africa and Madagascar (ASECNA) over the period from January 1981 to December 2014. Then, the models, techniques, tools and approaches used to design horizontal axis wind turbines were presented and the wind turbine components characteristics were determined. The numerical design and assembly of these components were carried out using SolidWorks software. The results revealed that the designed wind turbine has a power of 571W. It is equipped with a permanent magnet synchronous generator and has three aluminum blades with NACA 4412 biconvex asymmetrical profile. The values obtained for the optimum coefficient of lift and drag are estimated at 1.196 and 0.0189 respectively. The blades are characterised by an attack optimum angle estimated at 6° and the wedge angle at 5°. Their length is 2.50 m and the maximum thickness is estimated at 0.032 m for a rope length of 0.27 m. The wind turbine efficiency is 44%. The computer program designed on SolidWorks gives three-dimensional views of the geometrical shape of the wind turbine components and their assembly has allowed to visualize the compact shape of the wind turbine after export via its graphical interface. The energy quantity that can be obtained from the wind turbine was estimated at 2712,718 kWh/year. This wind turbine design study is the first of its kind for the study area. In order to reduce the technological dependence and the import of wind energy systems, the results of this study could be used to produce lower cost wind energy available on our study site.

Open Access Original Research Article

Kinetic Modelling of Oxalic Acid Production from Cassava Whey by Aspergillus niger

Dennis M. Chioma, Gideon O. Abu, Obioma K. Agwa

Current Journal of Applied Science and Technology, Page 18-26
DOI: 10.9734/cjast/2021/v40i3131547

The transition from eco-harmful chemical processes to bio-based production of organics has been challenged by the complex nature of fermentation processes. The growth kinetics and modelling of oxalic acid production from cassava whey by Aspergillus niger (MW188538) was studied in a batch fermentation system. The production kinetics of the fermentation study was fitted into the Monod, Leudeking-Piret and Andrews kinetic models. The oxalic acid, reducing sugar, cell dry weights were determined according to the experimental design. The results showed that the production of oxalic acid was associated with A. niger with significant R2 value of 0.96 and growth rate of 0.065 biomass/day using the cassava whey as a sole carbon source. The substrate consumption rate of 14.28 and 11.16 mg/g/day with an R2 value of 0.94 and 0.96 suggest there was a healthy utilization of the Cassava whey and yeast extract as described by the Leudeking-Piret and Monod models.

Open Access Original Research Article

Influence of Poultry Droppings on the Production and Mineral Profile of Cowpea (Vigna unguiculata (L.) Walp) in Kombé (Brazzaville, Congo)

J. Yoka, B. O. D. Bassoukissa, Y. F. Assongba, J. J. Loumeto, J. G. Djego, L. S. Baba-Moussa

Current Journal of Applied Science and Technology, Page 27-35
DOI: 10.9734/cjast/2021/v40i3131548

Cowpea (Vigna unguiculata (L.) Walp.) is one of the most important seed legumes in the tropics and subtropics. It is an important staple in sub-Saharan Africa, particularly in the arid savannahs of West Africa. The present study conducted in the Kombé area (Brazzaville) aims to assess the impact of poultry droppings on the yield and mineral profile of cowpea. Seeds of three cowpea cultivars (C1, C2, C3) were sown in a completely randomised system in two plots. Prior to sowing, a treatment of one dose of poultry droppings was applied in one of the two plots, which was named fertilised plot containing treatments C1D1, C2D1 and C3D1. The plot without droppings was the control plot with treatments C1D0, C2D0 and C3D0. The biomass of leaves, pods and seeds was assessed by the harvesting method followed by drying and weighing. Chemical data of leaves and soils were obtained after laboratory analysis. The results show that leaf biomass, pod biomass and seed biomass ranged from 1.8 t DM/ha to 3.4 t DM/ha, 960.2 kg/ha to 1706 kg DM/ha and 563.4 kg DM/ha to 1263.7 kg DM/ha respectively. Treatments C1D1 and C3D1 were respectively the most productive in leaf biomass and pod and seed biomass. The nitrogen and phosphorus contents in the leaves do not seem to be influenced by the addition of poultry droppings. However, these contents are improved in the soil after the application of poultry droppings. Poultry droppings have a beneficial effect on yield in terms of leaf, pod and seed biomass. Poultry droppings may be useful as an organic fertilizer for cowpea cultivation.

Open Access Original Research Article

Interaction Effect of Intellectual Capitals on University Performance

Abdulrasaq Mustapha

Current Journal of Applied Science and Technology, Page 67-79
DOI: 10.9734/cjast/2021/v40i3131550

Intangible assets constitute major resources in the university’s system. However, little or no attention has been given to effective utilization of these resources. This has not only affected the performance of the public universities in Nigeria adversely but also the economic development of the country. Hence, this study examined the effect of the interaction among intellectual capital components on the performance of public universities in South-Western Nigeria. The primary data obtained through the structured questionnaire administered on four hundred and twenty-four (424) respondents were analyzed using ordinary least square regression analysis. The result of the study revealed that the interaction between human capital and structural capital and the interaction between human capital and relational capital has significant positive effect on the performance of public universities in the South-Western Nigeria as indicated by p-values of 0.000 and 0.002 respectively. The result also shows that the interaction between structural intellectual capital and relational capital has an insignificant positive effect on the performance of public universities in the South-Western region of Nigeria as indicated by p-values of 0.139. This study therefore concluded that effective combination of the intellectual capital components improves the performance of public universities in the South-Western region of Nigeria. This study recommends that government at various levels should pay attention to funding strategies of higher education, particularly at university level. Innovative funding strategies that touch all aspects of university activities should reflected in the budget of university education from time to time to translate the expected mandate of ivory tower to reality.

Open Access Review Article

Therapeutic Activity of Collagen and Rosehip Extracts: A Review

Bharat Kwatra, Ramsha Tariq, Dibita Mandal, Nupur Ray, Sneha Hessa, Pratik B. Pardeshi

Current Journal of Applied Science and Technology, Page 36-66
DOI: 10.9734/cjast/2021/v40i3131549

This article is an examination of the therapeutic activity of collagen and rosehip extracts. The scientific development and subsequent activity of collagen continues to influence the researchers all over the globe today. This article examines the research done and published by researchers and scientists. Consideration of current trends and data in scientific queries demonstrates further therapeutic aspects of collagen and rosehip extracts. Collagen hydrolysate is known to alleviate pain in knee joints and provide other protective effects in osteoarthritis, research papers and review articles from the past were considered as the basis of this work. Researchers have carried out experiments and statistically proven the role of collagen hydrolysate in joint disorders and different ortho related disorders. Collagen hydrolysate can provide symptomatic relief to the patients with osteoarthritis and according to the in vitro studies it can also be considered as a potential candidate for its therapeutic properties. Clinical studies have indicated that collagen hydrolysate significantly reduces pain and disability. It also has various regenerating effects that can help restore the damaged cartilage.  Component and chemo metric analysis of the rose hip was done and rosehip extracts were characterized to reveal their anti-oxidant and anti-inflammation properties using enhanced cross-linking mechanism and High-performance liquid chromatography. Collagen and rosehip extracts are clinically proven beneficial for osteoarthritis, rheumatoid arthritis, back pain, joint disorders, knee pain and post – ortho surgery conditions like pain and inflammation. A compilation of data is done in this article and explores options for therapeutic activity of hydrolysate for the treatment of osteoarthritis and other joint disorders and as a dietary supplement in athletes with activity-related joint pain. Anti-inflammatory and anti-oxidant properties of rosehip powder, identification and characterization of the active component GOPO and the assessment of rosehips based on the content of their biologically active compounds and rosehip extracts in ortho and ortho post-surgery