International Journal of Advances in Applied Sciences
International Journal of Advances in Applied Sciences (IJAAS) is a peer-reviewed and open access journal dedicated to publish significant research findings in the field of applied and theoretical sciences. The journal is designed to serve researchers, developers, professionals, graduate students and others interested in state-of-the art research activities in applied science areas, which cover topics including: chemistry, physics, materials, nanoscience and nanotechnology, mathematics, statistics, geology and earth sciences.
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<![CDATA[UCD model in agile software processes ]]>
<![CDATA[Butt, Saad Masood]]>;
<![CDATA[Anatolyevna, Gnevasheva Vera]]>;
<![CDATA[Salmani, Hosna]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[Software development field is becoming more productive day by day with the wonderful model name Agile. Agile is the main focus of research now a days. It is because of its abilities of handling changes in efficient way through iterative and incremental practices. Although it became famous because of its capabilities still there are some issues in it, which is ignorance of usability engineering in different phases of agile that is an important aspect to understand the software. Usability has deep roots in software quality and is a core construct of HCI. To develop interactive and usable systems there is a need of such a model which can integrate HCI with Agile. To address this issue. To solve this issue we have proposed a model which will work with both User Centered (main focus of HCI) and Agile by assembling different practices from both fields which will result useable products. It will enhance software life with user satisfaction by giving them running software with usability.]]>
<![CDATA[Fuzzy logic based MPPT technique for energy conversion ]]>
<![CDATA[Mohit, Kumar]]>;
<![CDATA[Mohanty, S.K.]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[World is facing acute energy crisis as a result of which there is a need for renewable energy sources. Increase in demands and environmental issues lead to rise in renewable energy. Solar energy is being increasing and is being adopted by many countries but the output power is not constant because of two factors radiation and temperature. And also photo voltaic  V-I characteristics are non linear in nature. So MPPT algorithm is applied to increase the overall efficiency. There are many MPPT algorithms and everyone has their own advantages and disadvantages. Perturb and observe are most commonly used MPPT technique because of its simplicity. But it has some drawbacks also. This paper uses Fuzzy logic algorithm as well as Perturb and Observe tracking algorithm for optimizing maximum power point. After simulation and analysis in Matlab the results indicate that Fuzzy logic algorithm is better than perturb and observe because of its high convergence rate, more stability, fast time response and less overshoot. A complete PV system contrastingly comprises boost converter, MPPT algorithm, PV array, and a load mainly resistive type.]]>
<![CDATA[INVESTIGATION OF SUBSURFACE STRUCTURES WITHIN PARTS OF NIGER DELTA, NIGERIA, VIA AEROMAGNETIC DATA ]]>
<![CDATA[Ekpa, Moses M]]>;
<![CDATA[Ibuot, Johnson Cletus]]>;
<![CDATA[Okeke, Francisca N.]]>;
<![CDATA[Obiora, Daniel N.]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v9.i4.pp%p
<![CDATA[Geophysical study involving aeromagnetic method was carried out to investigate partsof Niger Delta in Nigeria, aimed at investigating the cause and nature of anomalous bodies within the study area. Spectral analysis technique was employed in quantitative interpretation to determine depth/thickness of the sedimentary basin, basement topography, structural trends,curie point depth, thermal gradient and heat flow in the area. The total magnetic intensity (TMI) anomalies had values of between -53.7nT and 119.5nT while the residual magnetic intensity ranged from -52.5 to 58.0nT. The spectral analysis revealedthe depth to magnetic sources varying from 2.5 to 5.5km while the shallow magnetic sources varied from 0.89 to 1.47km. The geothermal analysis revealed the curie point depth between 11.782 and 18.048km while the calculated geothermal gradient ranged lie between 32.137 and 49.231o . The heat flow values ranged from 80.343 to 123.080 . The results from this study have thrown more light to the understanding of the variation of subsurface structures in the study area. These will enhance the development of the resources and will be of economic benefit to the country if well harnessed. However, possible future research work on this active area is proposed for more robust results.]]>
<![CDATA[A modeling of copt-h∞ controller and its performance investigation in opto electric system ]]>
<![CDATA[Ramya, K]]>;
<![CDATA[Kumar, KA Ramesh]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[ This research work proposes Concentrated Opto Power Tracker (COPT) - H∞ controller modeling in Opto-Electric Converter System (OECS). The premeditated controller is designed using Riccati equation by considering the system uncertainties. State variable analysis approach is used for the analysis of the controller with system uncertainties. The designed controller is interfaced between the voltage Bias converter and the utility grid. With the proposed controller the grid voltages are estimated (eα,est, eβ,est) and is compared with the actual one (eα, eβ) to check for estimation errors and is observed that the estimation errors are close to zero. The Proposed work concentrates mainly on the modeling of Opto-Electric Converter System (OECS) for parameter uncertainties in the system for system stability. Modeling, Simulation and experimental results are done in MATLAB/SIMULINK to verify the performance of the Concentrated Opto Power Tracker (COPT) - H∞ controller.]]>
<![CDATA[Cooling performance of vortex generator ]]>
<![CDATA[Halder, Nirmal]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[Present numerical investigation proposes to mitigate the effects of CRVP by employing a pair of vortex generator. Numerical simulation has been carried out to investigate the effect of placement of vortex generator on the characteristics of film cooling effectiveness. Various configuration has been taken based on vortex generator location at upstream, downstream of circular film cooling hole. Along with these utilizing multiple vortex generator at different downstream location also has been detected. The jet to cross flow blowing ratios (M = Ïjuj / Ïcfucf) is maintained at unity while Reynolds number based on free stream velocity and film cooling hole dimension is kept at 17000. The investigation of suitable turbulence model has been studied. The results are compared with baseline case. The numerical investigation is accomplished implementing FLUENT commercial code adopting the K-omega SST model. Among configuration E and all quantity (DR, M, RE and TI) better CRVP distribution is depicted for TI and lowest for configuration E.]]>
<![CDATA[Performance of rubber seed oil as an alternative to diesel in oil-based drilling mud formulation ]]>
<![CDATA[Amanze Josiah Destiny]]>;
<![CDATA[Fortune Chukwuebuka Amanze]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp47-59
<![CDATA[The formulation of an oil-based mud was made possible with the oil extracted from rubber seeds using the famous Soxhlet extraction method. The mud was formulated using the American Petroleum Institute (API) standard of 25 g of bentonite to 350 mL base fluid. The choice of rubber oil comes as a result of its flash point and aniline point which lie in the range of base oils used for mud formulation. The rheological properties of the rubber oil-based mud (OBM) were beyond the scope of the viscometer and hence thinner was added to reduce its viscosity and its suitability to compete favorably with diesel OBM was checked. The 10 sec and 10 min gel strength of the rubber OBM were recorded as 68 lb/100 ft2 and 69 lb/100 ft2 respectively while that of Diesel was 65 lb/100 ft2 and 67 lb/100 ft2. The plastic viscosity of rubber OBM was 12 cp while that of Diesel was 17 cp. They both exhibited Bingham Plastic behavior and a similar yield point of 146 lb/100 ft2. The formulated mud samples were subjected to temperatures of 60 ºC and 75 ºC and it was discovered that rubber OBM was more likely to retain its rheological property than diesel OBM. Comparison with other rheological properties of diesel OBM showed that the formulated mud could be used alternatively for diesel in drilling operations.]]>
<![CDATA[Effects of autoclaving (Pleurotus osteratus) spent mushroom substrate water extract on the minerals, elicitors, cassava yield, and the management of African cassava mosaic virus ]]>
<![CDATA[Samuel Okere]]>;
<![CDATA[Anthony Eromosele Ataga]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp13-19
<![CDATA[Farmers all over the world spend millions of dollars to partially control plant diseases that attack their crops using agrochemicals that pollute the environment. Plant diseases reduce crop yield, quality, and shelf life. Enhancing the inherent ability of plants to resist diseases using elicitors and minerals is one of the neglected, sustainable, low-cost, and environmentally friendly approaches to ensure the continued supply of food and fiber. Therefore the aim of this paper is to evaluate the composition of the elicitors and minerals in autoclaved and unautoclaved water extract of Pleurotus osteratus spent mushroom substrate and the effects of its application on the management of African cassava mosaic virus (ACMV), growth, and yield of cassava. The treatments for this investigation comprised Pleurotus osteratus water extract spent mushroom substrate (POWESMS), Pleurotus osteratus autoclaved spent mushroom substrate (POAWESMS), and untreated cassava plants as control. The mineral compositions and the elicitors in the treatments were evaluated using standard procedures. The data generated were subjected to analysis of variance (ANOVA) at (p=0.05). The results obtained from this investigation revealed significant differences in the values of resistant elicitors and minerals. Significant differences were also recorded for the growth, yield parameters, and disease severity evaluated at 4 weeks intervals. The results showed that unautoclaved water extract performed significantly better than the autoclaved in reducing African cassava mosaic disease (ACMD) severity which did not translate to higher crop yield.]]>
<![CDATA[Voltage stability assessment using TCSC and SVC based FACTS controllers ]]>
<![CDATA[Jena, Ramakanta]]>;
<![CDATA[Swain, Sarat Chandra]]>;
<![CDATA[Chirantan, Shaswat]]>;
<![CDATA[Dash, Ritesh]]>;
<![CDATA[Panda, P.C]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[The Most causes of Voltage instability is the sources of reactive power .In order to protect the total system from voltage instability the reactive loads can be reduced or extra reactive power can be added to reach the Voltage collapse point .The Flexible AC transmission devices(FACTS) have made it flexible and possible to prevent Voltage instability by Fast and Flexible control method . Voltage collapse point is predicted with TCSC and SVC devices and is compared with each other. The Voltage stability Indicator is derived to identify the voltage collapse point. it is concluded that voltage stability index provides a simple means to predict vulnerability of a bus in a Multibus system for voltage collapse.]]>
<![CDATA[Performance Enhancement of Five Bus Power System Using Shunt Based FACTS Controllers ]]>
<![CDATA[Jena, Ramakanta]]>;
<![CDATA[Swain, Sarat Chandra]]>;
<![CDATA[Chirantan, Shaswat]]>;
<![CDATA[Dash, Ritesh]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp%p
<![CDATA[FACTS(Flexible AC Transmission System) a boost for grids, have the superior characteristics of grid flexibility,power quality improvement,long distance AC transmission & control series & shunt compensation.FACTS controllers have the inherent features of inject or absorb reactive power to/from the line at the time of requirement.These are synchronized by a bunch of power electronics based controllers.FACTS controllers are of series or shunt connected type or combination of both depending upon their connection with the transmission line.Generally these devices have the most reliable nature of enhancing the maximum power transfer capability from source end to load end.Because of this, FACTS controllers are most significantly used in recent days power system.In this paper shunt type of FACTS controller is taken for system performance analysis of a five bus system.FACTS devices considered here are SVC(Static Var Compensator) & STATCOM(Static Synchronous Compensator).Here,load flow analysis to be taken as the basic criteria for the study.Firstly,Load flow study has been conducted for an uncompensated five bus system & there by analyzing the stability limits in terms of voltage magnitude(p.u) and loss analysis in terms of overall real & reactive power losses.Then load flow study has been carried out for both the FACTS devices independently by incorporating them in to the five bus system.Also the optimal location of SVC & STATCOM is determined by installing at each bus separately & by considering the least possible losses and improved voltage profiles.A comparative study has been done here for these controllers in terms of enhancement of voltage stability and loss minimization & hence improvement of the power transfer capability.SVC & STATCOM both are of shunt FACTS controllers but they may differ in their functionality based on various system parameters in power system.The detailed performance analysis of an uncompensated & shunt compensated five bus system(SVC & STATCOM compensation) is investigated here.All the system performance study has been featured by using MATLAB/SIMULINK software.]]>
<![CDATA[Off-grid rural electrification using integrated renewable energy sources ]]>
<![CDATA[Fortune Chukwuebuka Amanze]]>;
<![CDATA[Destiny Josiah Amanze]]>
<![CDATA[ International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijaas.v10.i1.pp1-12
<![CDATA[Presented in this study is an economic and technical evaluation to determine the optimal system combination for off-grid power generation based on solar, wind, and biodiesel renewable energy resource. Nsukka being endowed with high-intensity solar radiation, adequate wind speed, and sufficient bioresource is a prospective candidate for a hybrid system. The monthly average daily global radiation ranges from 3.91 kWh/m2 to 5.74 kWh/m2 and the average wind speed is about 2.64 m/s. This system was designed to meet the load requirement of the school with annual electrical demand of 10,163 MWh. Sensitivity analysis was carried out based on the effect of changes in biodiesel fuel price and interest rates on the economic performance criteria of the optimal configuration. The optimum hybrid system is composed of a 1 kW capacity PV system, an auto-sized biodiesel generator, and a battery bank of 820 h of autonomy. The levelized cost of energy from the optimal system was found to be $0.0898 per kWh based on sensitivity results. These results obtained show that an integrated system with the combination of PV, biodiesel generator, and battery bank is a cost-effective alternative to grid extension which cost $0.126 per kWh. The system's life span is for 25 years, and it is sustainable, economical, technically feasible, and environmentally friendly.]]>
