International Journal of Advances in Applied Sciences
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Advanced optimal GWO-PID controller for DC motor
Get PDFThe current work aims to use traditional control algorithms and advanced optimization algorithms that was chosen for its ease of control and the possibility of using it in many industrial applications. By setting the appropriate specifications for the simulation model and after conducting the planned tests that simulate different applications of the motor’s work within electrical systems, the results proved to obtain good performance of the motor’s work, better response, high accuracy, in addition to the speed. The goal is to design and tune a proportional–integral–derivative (PID) controller by grey wolf optimization (GWO) using transfer function (T.F) for a direct current (DC) motor. To adjust the parameters of the traditional controllers using the optimum advanced, an appropriate mechanism and technology from the advanced optimization techniques were chosen, as the gray wolf technology algorithm was chosen as an optimization technique and integral time absolute error (ITAE) to adjust the parameters of the traditional PID controller
Digital terrestrial television in Nigeria: A technical review of path loss modeling and optimization techniques
Get PDFThe switch from analog to digital terrestrial broadcasting (DTTV) has resulted in a substantial shift in the contemporary television broadcasting environment, introducing a new means of transmitting content, as well as a new and upgraded process that will improve consumer satisfaction by ensuring greater reception. Despite the deadline, only a small percentage of terrestrial television stations in Nigeria have been digitalized. This work takes a critical review of various aspects of DTTV implementation, ranging from evolution to path loss estimation, prospects and challenges associated with the switch-over on the very high frequency (VHF) communication links as well as various optimization techniques that are adopted for DTTV in Nigeria and sub-Sahara Africa. Findings show that the prospects are bright and numerous benefits are accruable if the government of Nigeria can solve the problems facing its full migration. Furthermore, investigations into the path-loss of DTTV in the ultra-high frequency (UHF) communication links have enjoyed scanty attention, therefore, careful examination and suitable path-loss model development in this frequency regime for television (TV) services across various ecological and vegetation zones should be considered as it will aid the full deployment of DTTV in Nigeria
Automated Arabic-Arabic sign language translation system based on 3D avatar technology
Get PDFArabic sign language (ArSL) is the natural language of the deaf community in Arabic countries. Deaf people have a set of difficulties due to poor services available. They have problems accessing essential information or receiving an education, communicating with other communities, and engaging in activities. Thus, a machine translation system of Arabic to ArSL has been developed using avatar technologies. Firstly, a dictionary of ArSL was constructed using eSign editor software. The constructed dictionary has three thousand signs. It can be adopted for the translation system in which written text can be transformed into sign language. The dictionary will be available as a free resource for researchers. It is complex and time-consuming, but it is an essential step in the machine translation of whole Arabic text to ArSL with 3D animations. Secondly, the translator has been developed. It performs syntactic and morphological analysis and then applies a set of rules to translate an Arabic text into ArSL text based on the structure and grammar of ArSL. The system is evaluated according to the parallel corpus that consists of 180 sentences using the metric for evaluation of translation with explicit ordering metric for evaluation of translation with explicit ordering(METEOR) our system achieves a relative score of (86%)
Single phase grid interconnected high gain boost converter with soft switching capability
Get PDFThe grid-interconnected application systems require high voltage levels which leads to an efficiency reduction. To overcome this, a new high gain boost converter in association with a buffer capacitor, and passive clamp recovery circuit to restore leakage energy in coupled inductor is presented. The magnetic field of the linked inductor stores the energy obtained from the supply. The energy is transmitted to the connected load for consumption in further operating modes. A passive clamp network recovers the energy that is stored in the leakage inductance, enhances the gain of voltage, and improves overall system efficiency. The essential feature of this converter is that, high duty ratios are not required to achieve higher voltage gain, hence the reverse recovery problem of the diode is prevented. Moreover, a passive clamp network decreases the voltage stress of the switch, thus a minimum rating switch is used, as a result, the system's total efficiency improves. This converter output is fed as input to a single-phase full-bridge inverter and also synchronized to a single-phase grid. The performance and powers injected are analyzed by connecting a resistive load.
Sustainable supply of aviation fuel in Nigeria: the status quo and the challenges
Get PDFAdequate 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
The market potential and financial feasibility of cable car tourist attraction development in Pelaga, Bali, Indonesia
Get PDFThe purpose of this work is to carry out consumer and investor behavior through a feasibility study of cable car tourist attractions in agritourism in Pelaga Village, Petang district, which focuses on studying marketing and financial perspective. This research uses observation and feasible study methods based on marketing theory, and investment financial management theory. It is highly likely by potential tourists as an attraction that can openly present natural beauty, as an environmentally friendly tourist attraction, a unique tourist attraction in Bali, will provide public facilities, telecommunications, restaurants, and agro product market centers, proximity to the city center, availability of transportation to the location, easy access to locations, and community friendliness towards tourist arrivals. The economic aspect where analysis of market opportunities is based on estimated sales data for four types of services: cable cars, restaurants, UFO glass platform attraction, and under the park and agritourist. The findings of this study reinforce the method and theory that business-oriented development planning must go through a feasible study of at least two important aspects, namely aspects of market potential, and aspects of investment management which are expected to be profitable for investors
Integrated resistivity study on the effect of dumpsite leachate on groundwater at Ezeani-Obimo, Nsukka, Enugu state Nigeria
Get PDFThe 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
The concurrent upshot of optical path-length and pressure on O3 absorption cross-section in relation to green communication
Get PDFOzone gas is a greenhouse gas. Accurate measurement of its concentration is dependent on the right value of the ozone gas absorption cross-section. In the literature, discrepancies and inconsistencies have been however linked with ozone gas absorption cross-section. In the literature, information on the pressure effect on pressures less than 100 mbar and greater than 100 but less than 1000 mbar is not available for the visible spectrum. Thus, creating an information gap that this manuscript is intended to fill up. This is the problem that has been addressed in this present work. The method of simulation with SpectralCalc is the method adopted for the present work. HITRAN 2012 simulator, available on spectralcalc.com, was used in simulating the ozone gas absorption cross-section to determine the simultaneous effect of optical path length and pressure at two peak wavelengths in the visible spectrum. Simulation outcomes were obtained for an optical path length of 10 cm to 120 cm showing that the optimum absorption cross-section value of 5.1084×10-25 m2/molecule at 603 nm and 4.7182×10-25 m2/molecule at 575 nm for gas cells length between 10 cm and 120 cm are obtained at peak points. Pressure values at which ozone gas absorption cross-section becomes a constant value of 5.1058×10-25 m2/molecule at 603 nm and 4.7158×10-25 m2/molecule at 575 nm is optical path length dependent. The percentage difference between 5.1084×10-25 m2/molecule and 5.1058×10-25 m2/molecule is 0.05% for all lengths of gas cells considered. Similarly, the percentage difference between 4.7182×10-25 m2/molecule and 4.7158×10-25 m2/molecule is also 0.05% for all lengths of gas cells considered. These results are relevant for high-accuracy and high-precision ozone gas measurements. Furthermore, efficient measurement of ozone gas is a direct enhancement of green communication
Evaluating android smartphone’s bluetooth received signal strength indicator measurements for social distancing
Get PDFThis 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
Adaptive fuzzy sliding mode controller for a single-stage inverted pendulum
Get PDFSliding mode controller (SMC) has become a popular traditional control method in industries due to the most effective control strategies employing nonlinear control and the ability to reject disturbances, particularly for line trajectory control. However, this control method has chattering problems due to high-frequency switching. To cope with the shortcoming, an artificial intelligence (AI) method is utilized in the traditional SMC to eliminate or reduce this chattering problem. This paper investigates an adaptive fuzzy logic system combined with SMC algorithm to alleviate the problem. Fuzzy logic is chosen due to its advantages in tackling nonlinear properties using if-then thinking, whereas SMC method can be applied due to its ability to reject disturbance control. The inverted pendulum is selected as a controlled object and simulated using MATLAB/Simulink to investigate this control method. By combining the fuzzy logic system and the SMC approach, the chattering problems can be adaptively reduced on the line trajectory tracking signal. The adaptive fuzzy SMC achieved better performance with fast response compared with previous literature algorithms for similar plants