182 research outputs found
Sediments in the Tema Harbour (Ghana): chemical pollution and sedimentation rates; Dissertation, IHE Delft Institute for Water Education and Wageningen University.
No full textThe Tema Harbour in Ghana has been in operation for nearly six decades and is subject to large influxes of sediments and sediment pollution due to the intense human activities in the harbour area. This thesis assessed sediment pollution in the Tema Harbour by using the standard 10-day Corophium volutator and 28-day Hediste diversicolor whole-sediment toxicity bioassays as well as chemical contaminant (DDTs, HCHs, PAHs and metal - Cd, Pb, Cr, Ni, Cu, Zn and As) data. The bioassay results showed significant C. volutator and H. diversicolor mortalities, indicating that the Tema Harbour sediments are polluted and toxic. Biota-sediment accumulation factors further revealed a high potential for bioaccumulation of the sediment-associated metals, which can have adverse implications for the food chain. Thus, the Tema Harbour sediments are unsuitable for disposal at sea without remediation. The thesis further investigated sediment accumulation rates (SARs) in the Tema Harbour by the combined analyses of sediment trap and sediment core data. The sediment cores exhibited variable bulk density profiles, indicating highly dynamic and non-steady sedimentation conditions. 7Be-derived gross-estimates of very recent sediment accumulation rates using the constant flux-constant sedimentation (CF-CS) model were in the range of 2.5-9.0 g.cm-2.y-1. These values were much lower than the estimated average settling fluxes from the sediment trap data (15.2-53.8 g.cm-2.y-1), indicating sediment resuspension plays an important role in the sedimentation process. Conventional 210Pb sediment dating models did not allow any estimation of SARs in the Tema Harbour. The 210Pb-based TERESA model, on the other hand, proved to be a good tool for quantifying sediment accumulation rates in the Tema Harbour with time-averaged values in the range of 1.4-3.0 g.cm-2.y-1 and sediment accretion rates of 1.7-3 cm.y-1. In conclusion, this study has shown that the Tema Harbour has been severely affected by anthropogenic activities, resulting in pollution of the sediments, especially those from the Fishing Harbour and the Canoe Basin. Moreover, the sediment accretion rates in the harbour may pose moderate problems for sustainable use of the harbour. There is, therefore, a need to improve sediment and environmental management in the Tema Harbour and regulate the disposal of the dredged material originating from this tropical coastal harbour
Running water sound technique in contrast-based voiding cystourethrogram: A case–control study
No full textVerkeerswaterbouwkunde b.o.
No full textVaartuigen, vaarwegen, vaarweggebruikers, prognoses van het scheepvaartverkeer, begrippen capaciteit en weerstand, dimensionering van schutsluizen, capaciteit en weerstand van schutsluizen.Hydraulic EngineeringCivil Engineering and Geoscience
Waterbouwkundige kunstwerken b.o. (tunnels)
No full textSoorten oeververbindingen, afweging van keuzes, lengteprofiel van een tunnel, dwarsprofiel van een tunnel, uitvoering van het gezonken deel, enige constructieve aspecten.Hydraulic EngineeringCivil Engineering and Geoscience
Waterbouwkundige kunstwerken B.O.: Voorlopig dicaat
No full textCivil Engineering and GeosciencesHydraulic Engineerin
General B.O. Smith with four unidentified men.
No full texthttps://egrove.olemiss.edu/cfclayton/1058/thumbnail.jp
Aspecten van zandtransport in open waterlopen
No full textCollege "Materiaaltransport B.O.", sedimenttransport in rivieren.Hydraulic EngineeringCivil Engineering and Geoscience
Waterbouwkundige constructies b.o. I, college f9A
No full textHydraulic EngineeringCivil Engineering and Geoscience
Effects of occupational stress and coping mechanisms adopted by radiographers in Ghana
No full textBackground
Studies have shown that population of radiography staff within various hospitals in Ghana decreased by 30% in the last decade due to several reasons. One of such reasons understood to be related to stress and job satisfaction which affect work output.
Purpose
To investigate the effects of occupational stress and the coping mechanisms adopted by radiographers in Ghana.
Method
A descriptive survey using a five-point Likert-scale questionnaire with pre-coded responses was administered via email to respondents. Purposive sampling method was used to select 190 radiographers who work in hospitals in Ghana. Descriptive statistics was mainly used to analyse the data using SPSS Version 20.
Results
Of a total 190 questionnaires sent, 122 were completed and returned giving a 64.3% response rate. Majority 78 (64%) of respondents were males and the predominant area of work was conventional radiography. Most radiographers revealed they were stressed with 63% indicating high/very high levels of stress. The consequent effects of stress on radiographers were sick absence, depression and job dissatisfaction. Most of the radiographers used primary interventions to cope with stress.
Conclusion
This study has demonstrated that most radiographers in Ghana are stressed. However, they cope well with problem-solving mechanisms. This suggests that the decrease in number of radiographers within various facilities in Ghana by 30% may not necessarily be caused by stress but other factors which need to be investigated. Nevertheless, occupational stress has an effect on radiographers' quality of working life and may directly impact on their behaviour during service delivery
The impact of agricultural runoff on the quality of two streams in vegetable farm areas in Ghana
No full text- …
