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FUTOSpace is the Federal University of Technology, Owerri open-access repository that collects, preserves and make available in digital format the intellectual output of the university's community:
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Recent Submissions
Power Systems Engineering Technology
(Federal University of Technology, Owerri, 2010-05) School of Engineering and Engineering Technology, Department of Electrical/Electronic Engineering.
History of Architecture
(Federal University of Technology, Owerri, 2015-08-17) School of Environmental Sciences, Department of Architecture.
Computer Application to Architecture
(Federal University of Technology, Owerri, 2014-09-27) School of Environmental Sciences, Department of Architecture.
Spectrophotometric determination of the stoichiometries, stability constants and free energies of zinc (II) and vanadium (V) complexesm of anthranilic acid
(Federal University of Technology, Owerri, 2019-05) Eze, Edith Ogochukwu
This research work describes a simple and selective spectrophotometric methods for the determination of the stoichoiometries and the stability constants of zinc (II) and vanadium (V) complexes of anthranilic acid using Job’s method of continuous variation and Yoe-Jones mole ratio method. Zinc (II) ion formed a colourless complex with anthranilc acid at pH 4, and vanadium (V) formed a golden-yellow complex at pH 6. The complexes showed maximum absorbance at 309 nm for zinc (II) and 326.5 nm for vanadium (V). The zinc (II) ion formed a 1:2 metal to ligand mole ratio complex with anthranilic acid (HA), while vanadium (V) ion formed a 1:1 metal to ligand mole ratio complex with anthranilic acid. That is, for Zn2+/Acomplex, ZnA2 is formed and V5+/Acomplex, VO2A is formed.The stability constants, (Log K), molar absorptivity and free energies of the formation of Zn (II) and V (V) anthranlilate complexes were 5 x 105 , (5.71), 7.58 x 104 and -32.58 kJ/mol for zinc (II) anthranilate and 6.61x 104 , 6.67, 4.7x 106 and -38.07 kJ/mol for vanadium (V) anthranilate, respectively. It was found that the vanadium (V) ion formed more stable complex with anthranilic acid with Log K value of 6.67 compared to zinc (II) complex with Log K value of 5.71. The negative values obtained for the free energies of both complexes showed that the reactions were spontaneous, feasible and irreversible and that stable complexes were formed. Anthranilic acid is a bidented ligand and as such formed a 4-coordinate bis-chelate with each of the metals; square planar geometry is being suggested for each of the chelate complexes, bearing in mind that anthranilic acid is a strong ligand.
Characterization of multiple log-periodic array antennas for surveillance systems using a novel array-factor
(Federal University of Technlogy, Owerri, 2023-11) Okoye, Arinze Christian
This research endeavors to comprehensively characterize Multiple Log-Periodic Array (MLPA) antennas, specifically in the context of surveillance systems, using a novel array factor. This array factor streamlines the numerical characterization of MLPA antennas, regardless of the number of elements involved. The study employs a rigorous analytical approach, incorporating the Magnetic Vector Potential (MVP) model and pattern multiplication approach through a top-down methodology. The MVP model was chosen for its auxiliary function, which greatly simplifies the analytical processes. In practical terms, experimental Multiple Log Periodic Array antennas were designed and evaluated for this study. The parameters of these antennas were numerically assessed in the far field using the newly developed Array Factor. MatLab R2010a software played a pivotal role in simulating various parameters of the Multiple Log-Periodic Array antennas, including Array Antenna patterns, Electric/Magnetic fields, Average Poynting Vector, Radiation Intensity, Radiated Power, Directivity, and Directive Gain. The results demonstrated that the array antennas had a Directivity/Gain of 15.68dB or 45.68dBm, at the operating frequency range of 1.350GHz to 2.690GHz. The collective array patterns generated by the MLPA antennas were in line with expectations, relying on the corresponding field of single element. Multiple Log-Periodic Array antennas expanded the function of Single Log-Periodic Array (SLPA) antennas by significantly enhancing radiation gain and signal coverage. Thus, the novel Array Factor accelerates the process of characterizing array antenna parameters, thereby alleviating the bottleneck in computing antenna losses. This marks a significant advancement in the field of antenna technology.