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International Journal of Advances in Applied Sciences

IJAAS
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Published by Institute of Advanced Engineering and Science

ISSN : 22528814 EISSN : 27222594 DOI : http://doi.org/10.11591/ijaas

Core Subject : Science, Education, Social,

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

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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Articles 9 Documents

Search results for , issue "Vol 11, No 1: March 2022" : 9 Documents clear

Veriﬁcation and validation of digital twins and virtual testbeds Ulrich Dahmen; Tobias Osterloh; Jürgen Roßmann
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Our society is surrounded by technical systems that increasingly inﬂuence andtake over aspects of everyone’s everyday life. As we build on the correct functioning, the need for appropriate methodologies that support the development of reliable products persists. However, the development and in particular the qualiﬁcation become challenging due to their increasing inherent complexity. Virtual testbeds and digital twins are modern key concepts in this context and offer a wide range of opportunities for simulation-based veriﬁcation and validation processes with virtual prototypes, especially in cases where real tests are hard to perform. However, the validity of test results derived from virtual experiments depends on the quality of the underlying simulation models.Of course, the models themselves must be veriﬁed before. But in the contextof virtual testbeds and digital twins this becomes challenging since the corresponding models are usually complex themselves. Therefore, we presented an approach to establish structured veriﬁcation and validation activities for digital twins and virtual testbeds, based on a modular conﬁguration framework that supports the development of complex simulation models.

Modelling minicab drivers' disordered behaviour for choosing passenger and destination in Akure, Nigeria Adetayo Olaniyi Adeniran; Olorunfemi Samuel; Njoku Ikpechukwu
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

This study investigated the disordered behaviour of minicab drivers for choosing passenger and destination in Akure using the multinomial model and nested logit model respectively. Information was gathered by the distribution of questionnaires to minicab drivers plying the Federal University of Technology Akure (FUTA) North gate to the Oja-Oba axis in Akure, Nigeria. The objectives were to validate the performance of logit models; to identify the major parameters for selecting passenger and destination by disordered minicab drivers, and to examine the interrelationships of variables employed. Primary data was obtained from 314 respondents. The study found that the nested logit model gives a better utility value than the multinomial logit model with ρ02 = 0.48 more than ρc2 = 0.46 which justifies the assertion. Also, the major parameters for selecting passengers and destination by disordered minicab drivers in Akure are transport rates variable, distance variable, and travel time variable. The study recommends that an accurate pricing policy of minicab operation should be efficiently formulated, implemented, and enacted to prevent overcharging and undercharging.

Integrated resistivity study on the effect of dumpsite leachate on groundwater at Ezeani-Obimo, Nsukka, Enugu state Nigeria Mirianrita Ngozi Ossai; Benjamin Shaibu Ojoajogwu; John Akor Yakubu
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

The effect of dumpsite leachate on groundwater at the Ezeani-Obimo community was performed by employing Schlumberger and Wenner configurations for four vertical electrical sounding (VES) and four electrical resistivity tomography (ERT). Four geoelectric layers were obtained and characterized by KH, AK, KH, and QH curve types. The first layer, second and third layer has resistivity values ranging from 21.2 to 7026.0 with thickness and a depth ranging from 0.5-31.6 m. The fourth layer has resistivity values ranging from 105.9 to 3355.4 with undefined thickness and depth values harboring all the aquifer units in the study area. Aquifer resistivity and thickness values vary from 105.9 to 3355.4 and 6.6 to 27.1 m while aquifer conductivity ranges from 0.0003 to 0.0094 increasing towards the E-W direction. The longitudinal conductance and transverse resistance values vary from 0.0024 to 0.0623 and 698.94 to 27178.7 respectively. 2D ERT profiles show low resistivity in the eastern direction and a lateral spread of low resistivity value indicates that leachate flow is moving away gradually from the dumpsite to its outside environment. This study revealed that the layers harboring the aquifer in the area are significantly affected as a result of dumpsite leachate that accumulates on the surface. This result is beneficial for waste managers to take mitigation measures to prevent the risk of total contamination of the groundwater in the area in the nearest future.

Feasibility analysis of single wire earth return system for potential application in rural electrification in Nigeria Sani Sabo Mohammed; Nura Musa Tahir; Usman Bature Isyaku; Ahmad Bala Alhassan; Abdulrazak Sabo
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Traditionally, three-phase networks are used to transmit electric power to consumers. However, due to its high initial cost, many isolated rural communities are yet to have access to electricity. Thus, the single wire earth return (SWER) architecture, which uses the earth as the return path, attracts significant cost savings. In this paper, the potential application of the SWER system for rural electrification in Nigeria was presented. The cost-effectiveness of the SWER system which is about 70% less than the three-phase configuration, is due to the need for fewer cables, pole-top fittings, switching, and protection devices. Initially, the dynamic modeling of the equivalent SWER system was derived for the MATLAB simulation analysis. The pertinent parameters of the realized system, namely, micro-former leakage reactance, the resistive and inductive value of the single-phase network, were determined and employed for the SIMULINK and the repetitive power flow analyses. The results obtained from the power flow analysis and the simulation models for different loading conditions were found to agree with an error margin of +5%. This demonstrates that the proposed prototype can be adopted to reduce the prevalent energy poverty and thereby improved the quality of life of rural dwellers in Nigeria.

A review of simulink for single-phase rectifier Salam Waley Shneen; Roshen Tariq Ahmedhamdi; Moafaq K.S. Al-Ghezi
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

The current review aimed to i) Simulate the work of electronic transformer; ii) Analyze and design different types of electronic transformer; and iii) Identify the most important joints of the topic in the work of the electronic transformer by evaluating and improving the system components. The number of electronic keys has been approved in terms of representing the number of phases on one side and the type of wave on the other hand such as one-half phase full wave or wave, as well as single-phase, which will be detailed later. The type of electronic keys has also been adopted in terms of the representation of electronic keys in the form of a diode, a transistor, or a thyristor.

Risk management system for the monitoring and control of a small lettuce greenhouse Juan Guzmán; Juan Goyeneche; William Mosquera; Roberto Ferro; Edgar Aguirre; Jhon Monje
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

The management of agricultural risks is a scenario that allows knowing the probable factors that can affect a crop, knowing the variables allow designing control and mitigation of projects in case of any affectation, failure to do so may cause loss of production, the objective This research was the design and construction of a monitoring system for greenhouses that would allow to carry out a small-scale control of the environment, through knowledge of the behavior of the different agroecological variables that intervene in the process, allowing to generate different scenarios For the control of the different variables of nutrition, irrigation, and lighting, it was possible to carry out a set of experiments that showed that the system allows controlling the production in the established time, as well as the effect of the control on the quality of the vegetables.

A review on efficiency improvement methods in organic Rankine cycle system: an exergy approach Gollangi Raju; Nagamalleswara Rao Kanidarapu
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Exergy, one of the handed-down energy conservation techniques, which can obtain from thermodynamic laws (first and second), will disclose the work presented within the system, the amount of irreversibility as well as what are the possible ways to reduce inefficiencies in the system. This discourse mainly highlighted various techniques and possible methods for efficiency improvement in the organic Rankine cycle (ORC). That means mainly concentrated on following key parameters like the selection of working fluid, suitable expander, the different heat sources of an evaporator, and modifications in heat exchanger based on the application of ORC system through an exergy approach for better performance, decrease energy losses, and destruction rate. This review can help to pontificate for better-summarized results that were done before and suggest some ideas for how to select an optimized parameter for better efficiency and to decrease the destruction rate in the ORC system.

Evaluating android smartphone’s bluetooth received signal strength indicator measurements for social distancing Majid Faleh Alanezi; Muhammad Tajammal Chughtai
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

This paper presents a digital solution to reduce transmission of coronavirus disease 2019 (COVID-19) by maintaining social distance between the general public. The object is achieved by using bluetooth, which is already handy for almost everyone in the general public and comes as a standard feature in smartphones. The present technique uses an indirect method to calculate the range between the two objects. 5,300 samples were collected by adjusting the receiver at a range of angles to calculate the intensity of the bluetooth signal. The observations are presented in the form of plotted graphs between the number of samples and the average received signal strength indicator (RSSI) value at a particular angle of rotation.

Sustainable supply of aviation fuel in Nigeria: the status quo and the challenges Aderibigbe Israel Adekitan
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Adequate fuel supply and availability are vital for economic sustainability. Aviation fuel accounts for more than 30% of an airline’s operating expenditure. Jet fuel price is one of the factors that determine airfare and airlines’ profitability. Nigerian airlines run on civil grade jet A-1 fuel, and almost annually, the aviation sector is plagued with jet fuel scarcity and the resulting flight delays, rescheduling, and cancellations. Jet fuel scarcity and the escalating cost are products of multifaceted factors that are related to finance, logistics, management, and policy. This study highlighted the operational specifics of the Nigerian aviation fuel sector; it identified various business opportunities that affect air transportation and discusses the main industry challenges responsible for jet fuel price volatility and scarcity in Nigeria. Instability and shortage of foreign exchange (Forex), non-refining of jet fuel locally, and absolute dependence on jet fuel importation are some of the key causal factors. A total revamp of the aviation infrastructure, a review of the current incident of multiple and exorbitant operating fees, and licensing of private and modular refineries for jet fuel production will help address jet fuel scarcity issues in Nigeria.

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