http://hdl.handle.net/123456789/1071 2026-04-14T23:14:12Z 2026-04-14T23:14:12Z Kayil, Barnabas http://hdl.handle.net/123456789/12213 2025-06-09T10:55:32Z 2024-02-01T00:00:00Z

Design and Implementation f a Smart Low Energy Ram Pump Solar - Powered Arduino Aquaponics (Slersopaa) Kayil, Barnabas Aquaponics is a system of farming that combines both fish and crops within a closed-loop ecosystem. However, high setup costs (HSC), high operational costs (HOC), and high energy demands (HED) pose significant challenges, particularly in regions with limited access to electricity. In this thesis, Smart Low Energy Ram Pump Solar-Powered Arduino Aquaponics (SLERSOPAA) was designed. This innovative approach aims to reduce HSC, HOC, and HED of aquaponics by integrating bamboo grow beds, solar-powered Arduino automation (SPAA), and hydraulic ram pump (HRP), also known as ram pump (RP), into the system. The integration of HRP and SPAA results in a remarkable reduction of HED by 70.25%, while using of bamboo reduces the HSC by 80%. The effect of the reduced HED on water quality parameters in SLERSOPAA within the six months is: a potential hydrogen (pH) range of 7.22–8.05, dissolved oxygen (DO) range of 4.00–5.71 mg/L, electrical conductivity (EC) range of 1.30–1.81 mS/cm, and total dissolved solids (TDS) range of 0.986–1.160 g/L. Besides that, the results of growth rates for the following vegetables, such as hot pepper, tomato, cabbage, and cucumber, in just four weeks were reported. The growth rate of catfish was monitored closely. The obtained average mass of 209.3 g and length of 11.3 cm were recorded within three months. Aside from the bamboo reducing the HSC, it also provides the following antioxidant compounds, such as phenols, flavonoids, vitamin C, and E, which are natural alternatives for the developing functional foods and nutraceuticals within the system for vegetable growth. The SLERSOPAA offers a promising solution to food shortages, promotes clean energy usage, reduces household vulnerabilities, creates employment opportunities, and enhances resilience in sub-Saharan Africa. xviii, 115p:, ill.

2024-02-01T00:00:00Z Domegbebr, Gideon Dometanyem http://hdl.handle.net/123456789/12036 2025-05-28T17:23:26Z 2024-04-01T00:00:00Z

Designing of a Prototype Intelligent Arduino-Based Metal Debris Collector System Domegbebr, Gideon Dometanyem This thesis presents a proof-of-concept of the designing of a prototype of an Intelligent Arduino-Based Metal Debris Collector System (InAMDeCS). The InAMDeCS is made up of the following: a metal detector system, a microcontroller and an electromagnet, as well as an audio system. The prototype employs the principle of Noncontact Active Debris Removal Techniques (NADRT) which encompasses real-time detection of metal debris (MD) using the pulse induction metal detection principle and electromagnetic attraction. A microcontroller coordinates the activities of the metal detection and a subsequent actuation of the electromagnet to remove the MD. The simulations of the metal detection system and the electromagnet’s specifications were performed in a laboratory setting. A change in inductance as a result of MD acting as core for an air-cored coil was observed as a change in tone of the audio system and read as a voltage change in an Arduino Integrated Development Environment. The data obtained was used in training the controller. The electromagnet could attract a six-inch nail at an average distance of 5 cm when a direct current voltage of 6 V to 12 V flows through it. It works by broadcasting a pulsating magnetic field, receiving a returned field and analysing it to ascertain the presence of MD by determining a change in the time constant of an inductor-capacitor oscillator. It can be used as attachment to vehicles used in cleaning roads or it can be developed into an automobile for road maintenance services. The results confirmed the applicability of the prototype in detecting and removing MD from roads and other work site. xvii, 138p:, ill.

2024-04-01T00:00:00Z AKROBORTU, EMMANUEL http://hdl.handle.net/123456789/11657 2025-01-27T15:04:46Z 2023-08-01T00:00:00Z

Optimization Of Radiation Dose And Risk Assessment During Interventional Cardiology Procedures: A Case Study At The National Cardiothoracic Centre, Korle-Bu Teaching Hospital-Ghana AKROBORTU, EMMANUEL Cardiac intervention procedures involve high radiation doses, hence the need to protect patients and staff from deterministic and stochastic effects. Patients’ weight, height, age, and radiation exposure values were measured at the National Cardiothoracic Centre (NCTC), where a number of different interventional cardiology procedures were performed. Body Mass Index (BMI) was calculated from measured weight and height results. Dose data were collected for a total of 498 patients: comprising of 309 males and 189 females. The values for Dose Area Product (DAP) were measured using DAP meter for four cardiovascular examinations namely, Coronary Angiography (CA), Percutaneous Coronary Intervention (PCI), combine Coronary Angiography and Percutaneous Coronary Intervention (CAPCI) and Right Heart Catheterization (RHC). Occupational doses (staff effective doses) were calculated using three different double dosimetry algorithms with two dosimeters (TLDs) that were placed above and below the lead protective apron. Staff total detriment to radiation was estimated using risk coefficients for stochastic effect and the results obtained are 1.76∗ 10−3 for surgeons 7.96∗ 10−4 for nurses and 1.29 ∗10−4 for operators. BMI obtained for females and males were (29.92±5.51) kg/m2 and (27.14±4.03) kg/m2, respectively. Male dose values obtained were [(17.34±12.62), (74.77±11.20), (87.17±10.72), (34.87±37.48)] μGycm2 and female dose values were [(69.44±76.15), (133.49±94.37), (80.90±10.78), (34.27±35.02)] μGycm2 for CA, PCI, CAPCI and RHC, respectively. Effective doses obtained ranged between [0.54-2.20), (0.45-1.61), (0.52-1.04)] mSv for cardiologists, nurses, and operators, respectively. xviii,160p:, ill.

2023-08-01T00:00:00Z Nongnenuor, Festus http://hdl.handle.net/123456789/11344 2024-12-16T14:25:41Z 2023-01-01T00:00:00Z

Investigation of thermoelectric properties of graphene superlattice Nongnenuor, Festus Graphene and its derivatives have attracted significant attention due to their unique electronic, thermal, and mechanical properties which make it a promising material for device applications. This work theoretically investigated the thermoelectric properties of graphene superlattice which was subjected to a combined direct and alternative field. This was done by solving the Boltzmann’s kinetic equation within the semiclassical regime with the energy dispersion relation of graphene superlattice obtained using tight-binding approximation. The expressions for the resistivity, thermo-power as well as thermoelectric power factor of this novel material were derived analytical as a function of temperature, material parameters, and amplitudes of the external applied field. The findings suggest that graphene superlattice exhibits a metallic property, and as expected, its resistivity generally rises with temperature. Due to its low resistivity and high figure of merit at room temperature, graphene superlattice could be served as a suitable material for thermoelectric device applications xvi, 131p,; ill.

2023-01-01T00:00:00Z