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Effect of Varying Parboiling Conditions on Physical Qualities of Jasmine 85 and Nerica 14 Rice Varieties
A.J. Ayamdoo,B. Demuyakor,W. Dogbe,R. Owusu
American Journal of Food Technology , 2013,
Abstract: As part of research towards enhancing the value chain of parboiled rice in Ghana, a study was conducted to ascertain the ideal parboiling condition that optimizes the physical qualities of rice. The study was carried out at the Spanish Laboratory of University for Development Studies, Tamale, Ghana. Two rice varieties (Nerica 14 and Jasmine 85) were parboiled in the Laboratory at four different conditions (soaking and steaming time combinations) to ascertain the effects of each parboiling condition on the physical qualities of the parboiled rice. A combination of four (4) soaking times (6, 20, 24, 36 h) and three (3) steaming levels (40, 60, 90 min) was used. Samples were also taken from conventional parboiling groups and used as check alongside the control samples. The parboiled rice were milled and physical properties such as milling yield, Head Rice Yield (HRY), colour, hardness, broken percentage, translucency and gelatinization temperature were evaluated. The results showed that parboiling at 20 to 24 h soaking with 60 min of steaming produced rice with best physical qualities except for colour i.e Milling yield was 80%, HRY was 60% and whiteness was 49%. The commercial samples gave values that were close to medium parboiling. Also ANOVA results showed that soaking and steaming time have direct impact on the final quality of parboiled rice. It was recommended for processors to soak paddy rice for 20 h in warm water between 30 to 40°C followed by steaming for 60 min at 80°C to maximize the physical qualities of parboiled Jasmine 85 and Nerica 14.
Effects of computers on creativity of art students
BK Dogbe
Journal of Science and Technology (Ghana) , 2004,
Abstract: This study was made to investigate the effects of the use of computers by the Art students of the Kwame Nkrumah University of Science and Technology (KNUST) in Kumasi on their creativity in art productions. A total of 200 art students of the fourth year were involved in the study. The instrument consisted of a 20-item Likert scale questionnaire designed and validated by the researcher to elicit the desired responses from the students. The elements of creativity that were investigated included among others, the computer's ability or otherwise to surpass humans in creative art productions in terms of speed, flexibility, versatility, precision, capacity, efficiency and aesthetics. The responses of the questionnaires were coded. The mean and Standard deviations of the responses were calculated. The responses were later correlated through the use of the Pearson correlation formula. Computer was used in processing all data. The results showed varied intercorrelation. The views of the respondents showed a positive stance, which the researcher believes, arose out of enough experience or exposure to computers and their potentials. Based on these results a conclusion was made. Journal of Science and Technology Vol.24(2) 2004:84-91
Spherical Harmonics Expansion of the Vlasov-Poisson initial bounary value problem
Christian Dogbe
Mathematics , 2005,
Abstract: We derive and analyze the ‘SHE' (Spherical Harmonics Expansion) type system of equations coupled in energy. We also show that diffusive behavior occurs on long time and distance scales and we determine the diffusion tensor. The analysis is based on the governing kinetic equations arising in electron transport in semiconductors
----- Nous d\'{e}duisons et analysons le mod\`{e}le Spherical Harmonics Expansion (SHE) gen\'{e}ralisant le modele de D\'{e}rive Diffusion (DD) en ce qu'il d\'{e}crit le comportement d'un nuage de particules en fonction du temps, de la position et d'une variable d''energie (alors que les mod\`{e}les du type DD ne prennent pas en compte l''energie des particules. Nous prouvons galement que le comportement diffusif se produit sur de longues \'{e}chelles de temps et de distance et nous d\'{e}terminons le tenseur de diffusion. L'analyse est bas\'{e}e sur les \'{e}quations cin\'{e}tiques intervenant dans le transport d'\'{e}lectron en semi-conducteurs.
Prevalence of rice blast and varietal screening in Ghana
SK Nutsugah, W Dogbe, JK Twumasi, K Dartey, J Chipili, S Sreenivasaprasad, Y Séré
Journal of Science and Technology (Ghana) , 2005,
Abstract: Surveys were conducted in farmers' fields, participatory varietal selection (PVS) nurseries and researchers' fields during 2000-2002 cropping seasons to assess the incidence of rice blast (Pyricularia oryzae) in Ghana. Screenhouse artificial inoculation studies and field trials were also carried out on some of the rice varieties to assess their response to blast. Blast was recorded in 264 fields in the countrywide surveys. The incidence of blast varied considerably across the country and areas of blast scores of 0-3 (low), 4-6 (moderate) and 7-9 (high) have been identified. No blast was observed in Brong Ahafo, Greater Accra and Upper West Regions. Farmers at some of the high blast areas notably Fodome, Hohoe, Santrokofi and Datano reported complete devastation of their rice fields due to blast infection. The survey results suggest that Datano, Hohoe and Nyankpala are blast prone areas and key sites for resistance screening. The PVS rice varieties, with a few exceptions, had low blast severity scores at the key screening sites under natural field conditions, while the improved varieties had shown varying degrees of resistance to the dominant Ghanaian blast lineage representatives under screenhouse conditions. These improved varieties need to be tested sufficiently at other major rice-growing areas across the country to benefit the low-resourced farmers where improved varieties are not available or where local varieties are susceptible to the blast disease. Journal of Science and Technology Vol. 25(2) 2005: 18-34
Evaluation of Some Herbaceous Legumes for Use as Green Manure Crops in the Rainfed Rice Based Cropping System in Northern Ghana
T.B. Bayorbor,I.K. Addai,I.Y.D. Lawson,W. Dogbe
Journal of Agronomy , 2006,
Abstract: Five herbaceous legumes, Mucuna pruriens var. nagaland, Mucuna pruriens var. cochichinensis, Crotalaria retusa, Crotalaria juncea and Canavalia ensiformis were evaluated as green manure crops for rain fed rice at Nyankpala, Ghana in the interior guinea savanna zone of Ghana during the 2003 and 004 cropping seasons. The Mucuna and Canavalia were planted at a spacing of 20 x 60 cm. Crotalaria was drilled at a seeding rate of 50 kg ha-1 with 20 cm in between the rows. At flowering, the legumes were incorporated into the soil and rice planted. Nitrogen fertilizer was applied at 0, 0 or 60 kg ha-1 three weeks after planting rice. The treatment combinations were laid out in a factorial experiment in Randomized Complete Block Design (RCBD) with three replications. Results have shown that nodulation differed significantly among the legumes. Canavalia ensiformis (CE) gave the highest biomass followed by Mucuna pruriens var nagaland (MN). Mucuna pruriens var. nagaland (MN) gave the highest N accumulation. Incorporation of Mucuna pruriens var nagaland plus fertilizer application (30 kg N ha-1) enhanced yield of rice. It is recommended that for increased yield of rice, farmers in Northern Region of Ghana could integrate Mucuna pruriens var nagaland (MN) into their cropping system with fertilizer N application not exceeding 30 kg N ha-1.
Review of orbital exenterations in Korle-Bu Teaching Hospital
E Ackuaku-Dogbe
Ghana Medical Journal , 2011,
Abstract: Background: Orbital exenteration (OE) is a disfiguring procedure which typically involves removal of the entire contents of the orbit including the periorbita, appendages, eyelids and, sometimes, a varying amount of surrounding skin and bone. It results in devastating functional, aesthetic and psychological losses. Design: This study reports an experience of OE in a Teaching Hospital in Accra Ghana. Method: The records of all patients who underwent OE between November 2005 and October 2009 were reviewed retrospectively. These were cases seen at the orbit and oculoplastic clinic of the eye unit. Results: A total of 25 patients underwent OE. Nineteen (76%) of these were for invasive orbital squamous cell carcinomas and six (24%) were for other cases. Only one patient had OE for a benign condition (orbital haemangioma). Four patients had lid sparing procedures. One of these was for a patient with extensive ocular surface squamous cell carcinoma. Five patients had recurrent tumours. Among those patients with squamous cell carcinoma, seven had previous procedures, sometimes multiple before reporting to our clinic. Conclusion: Orbital exenterations in developing countries are mostly for neglected periorbital and ocular surface malignancies. Educating patients to seek medical attention as soon as they notice a persistent conjunctival growth could prevent this.
Performance-Based Pay as a Motivational Tool for Achieving Organisational Performance: An Exploratory Case Study
Francis Boachie-Mensah,Ophelia Delali Dogbe
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n12p270
Abstract: The issue of employees’ performance in furtherance of organisational objectives has occupied management attention for long. Differences in levels of performance have been attributed to differences in skills and abilities on the one hand, and to different theories of money on the other. This study examined the issue of performance-based pay as a motivational tool for achieving organisational performance, using the situation in a manufacturing company in Ghana as a case study. The main objective of the study was to assess the impact of performance-related pay on the motivation of employees and, subsequently, on the achievement of organisational goals. In all, one hundred and fifty respondents took part in the survey. The sample comprised 20 managerial staff and 60 non-managerial staff. The main research instrument was the questionnaire. A two-way ANOVA table was used to test the main hypotheses. The result of the study revealed that the effect of performance-based pay on employee performance is minimal; and the motivational effect of merit pay is often blunted by biased performance appraisal. The main limitation of the study is that it could not cover all manufacturing companies within the target population, due to time and financial constraints. In this respect, the interpretation of the results of the study should not be over-generalised.
Comparison of two detection methods in thin layer chromatographic analysis of some herbicides in a Coastal Savanna Soil in Ghana
S Afful, CK Akpabli, PO Yeboah, SA Dogbe
West African Journal of Applied Ecology , 2008,
Abstract: o-tolidine plus potassium iodide and photosynthesis inhibition detection methods were investigated for the analysis of three triazine herbicides (atrazine, ametryne, simazine) and two urea herbicides (diuron, metobromuron) in a coastal savanna soil using thin layer chromatography to compare the suitability of the two methods for the study of the herbicides. This was done by spiking 5 g of the soil sample with specific amount of the herbicide standards to generate herbicide-soil concentration of 40.24, 41.46, 40.28, 39.90 and 40.64 ìg/g for atrazine, ametryne, simazine, diuron and metobromuron, respectively. Extraction was performed with acetone/hexane mixture (4:1) and the detection limit of each herbicide was then determined. In all, the photosynthesis inhibition method performed better for both the triazine and the urea herbicides, while the o-tolidine plus potassium iodide method was suitable for only the triazine herbicides. With the photosynthesis inhibition method, detectability in the range of 0.004–0.008 ± 0.002 ìg/g was attained for the herbicides using the unclean extracts. In the case of o-tolidine plus potassium iodide method, detectability of 0.008–0.406 ± 0.02 ìg/g was obtained. With the clean up extracts detectability in the range of 0.025–0.162 ± 0.004 ìg/g was obtained using the photosynthesis inhibition method. However, metobromuron was not detected in the cleaned up extracts when o-tolidine plus potassium iodide detection method was used. For the methods described, clean up with SPE cartridge, equipped with C-18, is not critical to obtain the desired results.
Thin Layer chromatographic analyses of pesticides in a soil ecosystem
S Afful, SA Dogbe, K Ahmad, T Ewusie
West African Journal of Applied Ecology , 2009,
Abstract: Silica gel 60, silica gel 60 F254, and aluminium oxide as adsorbents were used to investigate their suitability for the analysis and detection of the pesticides: nitrofen, atrazine, diuron, dioxacarb, propoxur, propanil, carbaryl and cypermethrin in soil ecosystem using ethyl acetate, chloroform, dichloromethane and ethyl acetate/chloroform (1:1) as developing solvents. O-tolidine and potassium iodide reagent were used for the detection of the pesticides. Rf values obtained for the pesticides using the silica gel 60-ethyl acetate, silica gel 60 F254-ethyl acetate, silica gel 60-chloroform, silica gel 60 F254-chloroform, silica gel 60 – (1:1) ethyl acetate/chloroform and silica gel 60 F254 – (1:1) ethyl acetate/chloroform systems generally were within the stipulated range of 0.4 –0.8. Rf values obtained for the pesticides using silica gel 60-dichloromethane and silica gel 60 F254-dichloromethane systems were very low except for cypermethrin and nitrofen. Analysis with aluminium oxide coated plates gave a heavy yellow background with the detection reagent making visualization of spots difficult. Aluminium oxide coated plate is, therefore, not recommended when o-tolidine plus potassium iodide is used as detection reagent.
The Impact of Money on Joining, Continuing and Leaving Behaviours of Employees of Selected Ghanaian Organizations
Francis O Boachie-Mensah,Ophelia D. Dogbe Zungbey
International Journal of Business and Management , 2012, DOI: 10.5539/ijbm.v7n21p48
Abstract: The main objective of the study was to assess the impact of money on non-managerial and managerial employees’ joining, staying and leaving behaviours of selected Ghanaian organizations. The survey research design was used for the study. Primary data was collected using a well structured questionnaire administered on 150 non-managerial and managerial employees of selected organizations in the Greater Accra Metropolis. The ANOVA test of independence, the T-test of independence and correlation were used in testing the hypotheses. The study revealed that employees have different views as to the reasons why they stay in, or leave their organizations. It was revealed that money significantly influence employees staying or leaving organizations. The study showed that money is a motivator at work; both the symbolic and instrumentality meaning of money revealed its influence to motivate, energize and direct employment decision and its important role in an organization’s ability to attract and retain qualified, high-performance workers. A major limitation of the study is that, due to financial constraints, it was conducted in only few organizations in one region. Therefore, the findings may not be described as a reflection of the general state of affairs in other organizations in the country.
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