International Journal of Emerging Technology and Advanced Engineering
Null-fill is a method of improving the signal level in areas where pattern nulls occur. To take a... more Null-fill is a method of improving the signal level in areas where pattern nulls occur. To take advantage of itin improving FM broadcast coverage, factors such as antenna height in relation to the average terrain, the number of bays in the array and the location of the target area are considered. It is therefore important to understand the radiation characteristics of the antenna system after the application of null-fill. This paper presents an analysis of the radiation characteristics of a four-bay FM collinear antenna array composed of circularly polarized elements with varying upper and lower bank power ratios. The analysis leads to the discussion of the capabilities and limitations of null-fill with the different bank ratios. Results show that, in the elimination of pattern nulls, the bank power ratio of 95:5 produces the best results. Also, irrespective on the value of the bank ratio, there exists a pattern null near the tower base. If left uncorrected, this pattern null poses ...
OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF), 2020
Optical properties of 2D MoS2 have been investigated and used to design optoelectronic devices. P... more Optical properties of 2D MoS2 have been investigated and used to design optoelectronic devices. Photodetectors and photovoltaic devices, fabricated with symmetric and asymmetric metal contacts, show high photoresponsivity and open-circuit voltage, respectively.
International Journal of Recent Technology and Engineering (IJRTE), 2020
The paper presents a design and development of a multi-station automated hand-washing system (MSA... more The paper presents a design and development of a multi-station automated hand-washing system (MSAHWS) that could be integrated into overall solution strategies for combating the threat of SARS-Cov-2 infections and minimizing the health and economic devastation the virus spread can inflict. The researchers seek to create a system that uses a single micro-controller and caters to several users, each of them being served independently of each other. The MSAHWS development follows a four-part methodology: formulation of the sanitary, operational, manufacturing and economic requirements; design, modeling, and simulation of the micro-controller-based control system; MSAHWS hardware prototype development; and system test and data collection. The MSAHWS design and development focuses on a double-station system that uses a single Arduino Uno, an ultrasonic sensor for each station, 4 FET’s, 4 liquid pumps, a water tank, a soap reservoir, a power supply and a frame to house the system. The non...
International journal of engineering research and technology, 2020
Today, global warming is affecting the world and the globe is looking to tackle the gross effects... more Today, global warming is affecting the world and the globe is looking to tackle the gross effects by relying on green energy sources. Relying on renewable energy source has its own part to play and every small contribution have a meaning effect and role. This paper is about designing Small Scale wind turbine as an alternate power source for Addis Ababa city residents. In this paper, the airfoil based on the wind data of Addis Ababa has been designed using SWRDC source code, the power and torque coefficients has been calculated using MATLAB 2013 and finally it was able to design 25.418KWh power generating horizontal axis small scale wind turbine, and this is higher than the demand by a single house hold which is 20KWh. Therefore, it is found that the design remains applicable as an alternate energy source for the city residents. Keywords—Airfoil; Wind Turbine; Alternate Power; Power Coefficient; Renewable Energy; Torque Coefficient; Tip Speed ratio
International Journal of Scientific and Research Publications, 2020
Today, world is looking for alternate energy sources as the gross effect of GHG is disturbing the... more Today, world is looking for alternate energy sources as the gross effect of GHG is disturbing the nature balance. Ethiopia is a country with an aggressive plan to solely depend on clean Energy. This paper is about feasibility study of a 100MW PV power plant at Bati, Ethiopia. For the study RETScreen software is used, Using the RETScreen the benchmark analysis, emission analysis and financial analysis were made. From the bench mark analysis the energy cost of production is reduced to 1.6 ETB/KWh, the emission analysis shows that 2365.3 tCO 2 will be reduced from the potential emission to the environment finally from financial analysis the NPV and the cumulative cash flow shows positive results. Hence, this means the project is feasible financially, technically and environmentally and it will help the country to achieve its goal in building clean energy
International Journal of Scientific and Research Publications, 2020
The design and development of a non-contact temperature reader and sanitizer dispenser (NTRSD) sy... more The design and development of a non-contact temperature reader and sanitizer dispenser (NTRSD) system is presented in this study. The system is intended to help prevent the spread of SARS-CoV-2 infection and assist in maintaining and/or improving community health and reducing the negative impact of the infection on the economy and society. The NTRSD has two subsystems, the temperature reader (TR) and the sanitizer dispenser (SD), which is controlled from a common microcontroller and by design, cannot operate simultaneously. The TR is designed and developed to perform comparably in terms of accuracy with existing and commercially handheld infrared thermometers, display to the user the temperature read, and give visual and aural alerts when the temperature read exceeds the critical body temperature of 38 degrees centigrade. The SD is designed and developed to deliver sanitizer economically, by dispensing only once and only at a needed amount when activated. The design and development of the system go through the following methodology: System Specification, Control System Design, Hardware Prototype Development, System Test and Data Collection. Based on data obtained from tests made on the built prototype, a reiteration of the above steps is carried out wherein the control system software logic and parameters are adjusted so as to meet the specified system performance. The final test results are acceptable and shows the NTRSD provides a significant contribution on temperature monitoring and on disinfecting the hands The system utilizes a single Arduino Uno, an MLX90614 temperature sensor, two ultrasonic sensors, an LCD, two pilot lights, a buzzer, a submersible sanitizer pump, an alcohol reservoir, a power supply and a frame to house the system. Photos of the built and tested prototype, a schematic diagram of the control system, and the flowchart on which the Arduino script is developed are shown. The operation and user-interaction of the actual system is also described. Data are also tabulated and shown along with statistical analysis. The control system program is written such that the temperature read and displayed by the NTRSD very closely matches that of a hand held temperature reader. The non-contact feature for both the reading of body temperature and the dispensing of sanitizer provided by NTRSD precludes the possible viral transmission from using traditional thermometers, renders handheld IR thermometer operators (HITOs) unnecessary, avoids viral transmission between HITOs and subjects of their temperature scans, and ensures a clean and uncontaminated sanitizer. The system is envisioned for strategic deployment in public and private areas like public markets, banks, hospitals, schools, offices, residences, and many others.
International Journal of Emerging Technology and Advanced Engineering
Null-fill is a method of improving the signal level in areas where pattern nulls occur. To take a... more Null-fill is a method of improving the signal level in areas where pattern nulls occur. To take advantage of itin improving FM broadcast coverage, factors such as antenna height in relation to the average terrain, the number of bays in the array and the location of the target area are considered. It is therefore important to understand the radiation characteristics of the antenna system after the application of null-fill. This paper presents an analysis of the radiation characteristics of a four-bay FM collinear antenna array composed of circularly polarized elements with varying upper and lower bank power ratios. The analysis leads to the discussion of the capabilities and limitations of null-fill with the different bank ratios. Results show that, in the elimination of pattern nulls, the bank power ratio of 95:5 produces the best results. Also, irrespective on the value of the bank ratio, there exists a pattern null near the tower base. If left uncorrected, this pattern null poses ...
OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF), 2020
Optical properties of 2D MoS2 have been investigated and used to design optoelectronic devices. P... more Optical properties of 2D MoS2 have been investigated and used to design optoelectronic devices. Photodetectors and photovoltaic devices, fabricated with symmetric and asymmetric metal contacts, show high photoresponsivity and open-circuit voltage, respectively.
International Journal of Recent Technology and Engineering (IJRTE), 2020
The paper presents a design and development of a multi-station automated hand-washing system (MSA... more The paper presents a design and development of a multi-station automated hand-washing system (MSAHWS) that could be integrated into overall solution strategies for combating the threat of SARS-Cov-2 infections and minimizing the health and economic devastation the virus spread can inflict. The researchers seek to create a system that uses a single micro-controller and caters to several users, each of them being served independently of each other. The MSAHWS development follows a four-part methodology: formulation of the sanitary, operational, manufacturing and economic requirements; design, modeling, and simulation of the micro-controller-based control system; MSAHWS hardware prototype development; and system test and data collection. The MSAHWS design and development focuses on a double-station system that uses a single Arduino Uno, an ultrasonic sensor for each station, 4 FET’s, 4 liquid pumps, a water tank, a soap reservoir, a power supply and a frame to house the system. The non...
International journal of engineering research and technology, 2020
Today, global warming is affecting the world and the globe is looking to tackle the gross effects... more Today, global warming is affecting the world and the globe is looking to tackle the gross effects by relying on green energy sources. Relying on renewable energy source has its own part to play and every small contribution have a meaning effect and role. This paper is about designing Small Scale wind turbine as an alternate power source for Addis Ababa city residents. In this paper, the airfoil based on the wind data of Addis Ababa has been designed using SWRDC source code, the power and torque coefficients has been calculated using MATLAB 2013 and finally it was able to design 25.418KWh power generating horizontal axis small scale wind turbine, and this is higher than the demand by a single house hold which is 20KWh. Therefore, it is found that the design remains applicable as an alternate energy source for the city residents. Keywords—Airfoil; Wind Turbine; Alternate Power; Power Coefficient; Renewable Energy; Torque Coefficient; Tip Speed ratio
International Journal of Scientific and Research Publications, 2020
Today, world is looking for alternate energy sources as the gross effect of GHG is disturbing the... more Today, world is looking for alternate energy sources as the gross effect of GHG is disturbing the nature balance. Ethiopia is a country with an aggressive plan to solely depend on clean Energy. This paper is about feasibility study of a 100MW PV power plant at Bati, Ethiopia. For the study RETScreen software is used, Using the RETScreen the benchmark analysis, emission analysis and financial analysis were made. From the bench mark analysis the energy cost of production is reduced to 1.6 ETB/KWh, the emission analysis shows that 2365.3 tCO 2 will be reduced from the potential emission to the environment finally from financial analysis the NPV and the cumulative cash flow shows positive results. Hence, this means the project is feasible financially, technically and environmentally and it will help the country to achieve its goal in building clean energy
International Journal of Scientific and Research Publications, 2020
The design and development of a non-contact temperature reader and sanitizer dispenser (NTRSD) sy... more The design and development of a non-contact temperature reader and sanitizer dispenser (NTRSD) system is presented in this study. The system is intended to help prevent the spread of SARS-CoV-2 infection and assist in maintaining and/or improving community health and reducing the negative impact of the infection on the economy and society. The NTRSD has two subsystems, the temperature reader (TR) and the sanitizer dispenser (SD), which is controlled from a common microcontroller and by design, cannot operate simultaneously. The TR is designed and developed to perform comparably in terms of accuracy with existing and commercially handheld infrared thermometers, display to the user the temperature read, and give visual and aural alerts when the temperature read exceeds the critical body temperature of 38 degrees centigrade. The SD is designed and developed to deliver sanitizer economically, by dispensing only once and only at a needed amount when activated. The design and development of the system go through the following methodology: System Specification, Control System Design, Hardware Prototype Development, System Test and Data Collection. Based on data obtained from tests made on the built prototype, a reiteration of the above steps is carried out wherein the control system software logic and parameters are adjusted so as to meet the specified system performance. The final test results are acceptable and shows the NTRSD provides a significant contribution on temperature monitoring and on disinfecting the hands The system utilizes a single Arduino Uno, an MLX90614 temperature sensor, two ultrasonic sensors, an LCD, two pilot lights, a buzzer, a submersible sanitizer pump, an alcohol reservoir, a power supply and a frame to house the system. Photos of the built and tested prototype, a schematic diagram of the control system, and the flowchart on which the Arduino script is developed are shown. The operation and user-interaction of the actual system is also described. Data are also tabulated and shown along with statistical analysis. The control system program is written such that the temperature read and displayed by the NTRSD very closely matches that of a hand held temperature reader. The non-contact feature for both the reading of body temperature and the dispensing of sanitizer provided by NTRSD precludes the possible viral transmission from using traditional thermometers, renders handheld IR thermometer operators (HITOs) unnecessary, avoids viral transmission between HITOs and subjects of their temperature scans, and ensures a clean and uncontaminated sanitizer. The system is envisioned for strategic deployment in public and private areas like public markets, banks, hospitals, schools, offices, residences, and many others.
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