http://hdl.handle.net/123456789/1376 Tue, 14 Apr 2026 23:13:12 GMT 2026-04-14T23:13:12Z http://hdl.handle.net/123456789/5830 inwater harvesting potential of University of Cape Coast campus: a GIS approach Oteng-Peprah, M.; Marfo, M. Osei; Duncan, A,; Sitsofe, A. A. This study accesses the potential of rainwater harvesting as an alternative to conventional water supply scheme in University of Cape Coast. The study involves estimating the surface area of rooftops on the University of Cape Coast campus by using Geographical Information System (GIS), obtaining the mean annual rainfall from the meteorological survey department and determining the quantity of rainwater that can be harvested on UCC campus. Satellite imagery of the whole campus is obtained with Google Earth. Thematic Maps are generated for 2008 to 2012. The volume of rainwater is then calculated for each year. From the calculation, it is realized that an average volume of 178,441m 3 of rainwater can be harvested each year. The average water demand of the university during peak seasons is estimated to be 548.1m 3 per day. This implies that, the rainwater can serve the University for about 325 days 7p:, ill. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/123456789/5830 2014-01-01T00:00:00Z http://hdl.handle.net/123456789/5662 Benzoato and thiobenzoato ligands in the synthesis of dinuclear palladium(iii) and -(ii) compounds: stability and catalytic applications Estevan, Francisco; Ibáñez, Susana; Ofori, Albert; Hirva, Pipsa; Sanaú, Mercedes; Úbeda, Ma Angeles New palladium(III) compounds of formula Pd2[(C6H4)- PPh2]2[OXC(C6H5)]2Cl2 [3a (X = O);3b (X = S)] were obtained by the oxidation of the analogous palladium(II) ones with PhICl2 and were characterized by 31P,1H, and 13C NMR spectroscopy at 223 K. Compound 3a was also structurally characterized by single-crystal X-ray diffraction methods, which revealed a Pd–Pd distance of 2.5212(10) Å. DFT calculations were conducted to study the stability of all of these new palladium(III) and -(II) compounds with focus on the influence of the O↔S substitution of the donor atom in the ligand. The palladium (II) compounds Pd2[(C6H4)PPh2]2- [OXC(C6H5)]2 [2a (X = O),2b (X = S)] were also tested as pre-catalyst in two reactions: (1) the acetoxylation of 2-phenylpyridine and (2) the room-temperature 2-phenylation of indoles. Compound 2b is a better precatalyst than 2a in the first reaction (4 h; isolated yield, 67.5 vs. 50.4%). In the second catalytic reaction, isolated yields of 97 (10 h, substrate: 1-methylindole) and 99% (24 h, substrate: indole) were obtained with 2a as the precatalyst, whereas 2b gave low or noconversion 11p:, ill. Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/123456789/5662 2015-01-01T00:00:00Z http://hdl.handle.net/123456789/3474 Implementation of compensator-based intensity modulated radiotherapy with a conventional telecobalt machine using missing tissue approach Tagoe, S.N.A; Mensah, S.Y; Fletcher, J.J Objectives: The present study aimed to generate intensity-modulated beams with compensators for a conventional telecobalt machine, based on dose distributions generated with a treatment planning system (TPS) performing forward planning, and cannot directly simulate a compensator. Materials and Methods: The following materials were selected for compensator construction: Brass, Copper and Perspex (PMMA). Boluses with varying thicknesses across the surface of a tissue-equivalent phantom were used to achieve beam intensity modulations during treatment planning with the TPS. Beam data measured for specific treatment parameters in a full scatter water phantom with a 0.125 cc cylindrical ionization chamber, with a particular compensator material in the path of beams from the telecobalt machine, and that without the compensator but the heights of water above the detector adjusted to get the same detector readings as before, were used to develop and propose a semi-empirical equation for converting a bolus thickness to compensator material thickness, such that any point within the phantom would receive the planned dose. Once the dimensions of a compensator had been determined, the compensator was constructed using the cubic pile method. The treatment plans generated with the TPS were replicated on the telecobalt machine with a bolus within each beam represented with its corresponding compensator mounted on the accessory holder of the telecobalt machine. Results: Dose distributions measured in the tissue-equivalent phantom with calibrated Gafchromic EBT2 films for compensators constructed based on the proposed approach, were comparable to those of the TPS with deviation less than or equal to ± 3% (mean of 2.29 ± 0.61%) of the measured doses, with resultant confidence limit value of 3.21. Conclusion: The use of the proposed approach for clinical application is recommended, and could facilitate the generation of intensity-modulated beams with limited resources using the missing tissue approach rendering encouraging results. © 2018 Samuel N. A. Tagoe et al., published by Sciendo 2018. Article Sat, 01 Dec 2018 00:00:00 GMT http://hdl.handle.net/123456789/3474 2018-12-01T00:00:00Z