Cross River University of Technology

About: Cross River University of Technology is a education organization based out in Calabar, Nigeria. It is known for research contribution in the topics: Population & Exergy. The organization has 465 authors who have published 507 publications receiving 2705 citations.

Academic Staff Disposition To Promotion Criteria In Nigerian Universities

Abstract: This study aimed at determining academic staff satisfaction with promotion criteria and what, in their view, should be included in the promotion criteria. A researcher-designed questionnaire was utilized for data collection from a sample size of 349 academic staff. Findings show that the majority of the academic staff were dissatisfied with the promotion practices. Academic staff were satisfied with promotion criteria that had to do with required number of publications but dissatisfied with those related to computer literacy and international publication requirements. An oral interview before promotion was advocated for inclusion into the promotion criteria by academic staff. Evolving a more holistic criterion for promotion of academic staff was recommended.

Phytochemical composition, antimicrobial effect of azadirachta indica and carica papaya extracts on fungi isolated from gmelina arborea seedling

Abstract: Gmelina arborea Roxb has important economic value in Nigeria and worldwide It has been used as timber, for pulp and paper, furniture, plywood and for particle board Due to the menace caused by fungal diseases in nurseries and sites where the seedlings are raised and the observed disease severity at the Awi Gmelina Forestry Project Nursery in Cross River State, Nigeria It became necessary to provide a viable environmentally friendly measure to curb the diseases, hence, a trial on the antifungal effects of leaf extracts of Carica papaya and Azadirachta indica in-vitro using different extract solvents on some pathogenic fungi isolated from Gmelina arborea seedlings The isolated fungi were Trichoderma viride (from stem and leaf) and Mucor mucedo (stem and leaf) The solvents used were ethanol, methanol, propanol, butanol, acetone, chloroform and distilled water Phytochemical screening of extracts of C papaya from the different solvents showed that there was no tannin and hydroxymethyl anthraquinine Flavonoids and polyphenols were in excess in acetone and methanol extracts respectively For A indica, polyphenols were only found in excess in ethanol and methanol extracts Application of the extracts at different percentages of 0% (control), 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% showed that Carica papaya extracted with butanol was more potent on Trichoderma viride and Mucor mucedo at 60%, 70%, 80% and 100% while the growth of Trichoderma viride and Mucor mucedo was checked by butanol extracts of A indica at 70%, 80%, 90% and 100% Conclusively, butanol extracts of C papaya and A indica at higher concentrations is recommended for use as spray to control the diseases

Occurrence and distribution of Chrysops species in Akamkpa community of Cross River State, Nigeria.

Abstract: Chrysops species have been recognized for its role as vectors in the transmission of human loiasis in Nigeria. This investigation was aimed at studying the occurrence and distribution of Chrysops species in Akamkpa community, Cross River State. Two fly boys were used as human baits in the collection of adult Chrysops from each of the various villages in Akamkpa community, cross river state, Nigeria. Two species of Chrysops were identified. Chrysops dimidiata recorded significantly higher prevalence of 69.7% than Chrysops silacea 30.3% in all the sampling sites (p<0.05). Out of the 1299 Chrysops species caught in the entire study, the highest prevalence was reported during the late rainy season 916 (70.5%), while the least prevalence of 137 (10.6%) was reported during the late dry season (p<0.05). Two biting peaks 9-10 am and 3-4 pm were identified for Chrysops at all the sampling sites. Fly abundance was found to be higher in the morning hours than in the afternoon. The knowledge of the occurrence and distribution of Chrysops vectors will aid in the ongoing control program for human loiasis in Nigeria and the neighbouring countries where the vectors exist.

Design steps of narrow tillage tools for draught reduction and increased soil disruption - a review.

Abstract: Design steps of narrow tillage tools for draught reduction and increased soil disruption was reviewed. Narrow tillage tools are the main components of conservation tillage and soil compaction alleviation equipment. Literature regarding dynamic behaviour and step-by-step design of narrow tillage tools is scarce. A better understanding of soil dynamic behaviour and designing steps will help in the design of new tool shapes which will reduce tool draught, energy demand and increased soil disruption over a wide speed range. At the same time, narrow tools disturb less soil, ideally only the minimum necessary to establish a crop. Narrow tillage tools such as subsoilers have gain much ground in their application for alleviating soil compaction; and are attracting awareness in their utilization for conservative tillage practices. There is a great amount of variability in depth and thickness of hardpan layers from field to field and also within the field. Applying uniform-depth tillage over the entire field may be either too shallow or too deep and can be costly. There is very little to gain from tilling deeper than the compacted layer and in some cases it may be detrimental to till into the deep clay layer. Hence the need for more studies on development of narrow tillage tools for site specific and in-row tillage practices for the enhancement of agriculture. A steps-wise study of the design process of narrow tillage tools will help the designers and producers to improve on the quality of their work for efficient application in agriculture. The purpose of this article is to bring to light the design steps and the various expressions involve in the effective design and construction of narrow tillage tools.

Inhibition, Adsorption and Thermodynamic Investigation of Iron Corrosion by Green Inhibitors in Acidic Medium

Abstract: The corrosion inhibition potentials of alkaloid, saponin and flavonoid extracts of Ocimunbasilicum leaves were investigated by evaluating the corrosion behaviour of Iron immersed in 1.0 M H2SO4 solutions containing varied concentration of the extract (0.5 g/L, 1.0 g/L, 2.0 g/L, 3.5 g/L, 5.0 g/L, 7.5 g/L and 10.0 g/L) using chemical methods. Maximum temperature attained, reaction time, thermodynamic data and adsorption characterizations were utilized to evaluate the corrosion inhibition and adsorption properties of the extract. The results revealed that, the corrosion of Iron decreases with increase in concentration of alkaloid extract, saponin extract and flavonoid extract, also, increases with increase in H2SO4 concentration. The increase in addition of the green inhibitors to the corrosive medium, improve the values of inhibition efficiency of the extract in the order AEOBL > SEOBL > FEOBL. In all cases, Flavonoid extracts exhibits least effect on the corrosion of Zinc in comparison with alkaloids and saponins. Results obtained from adsorption studies indicated that, all the green inhibitors were adsorbed on the surface of the Iron and that the adsorption fit excellently with the assumptions of the Langmuir adsorption isotherm model. All data acquired revealed that Ocimunbasilicum leaves are efficient inhibitors of corrosion in acid medium due to the presence of heterocompounds: saponins, tannins, flavonoids, glycosides, carbohydrates, reducing sugars, terpenoids, steroids and alkaloids.