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Impact of leadership styles on teaching and learning process in Imo State

- Ukpere, Wilfred I., Anyanwu, O.J., Okoroji, L.I.

Authors: Ukpere, Wilfred I. , Anyanwu, O.J. , Okoroji, L.I.
Date: 2014
Subjects: Leadership , High school teachers
Type: Journal
Identifier: uj:5462 , ISSN 2039-2117 , http://hdl.handle.net/10210/13438
Description: The research examined the effect of leadership styles on teaching and learning process. The population comprises the academic staff of selected secondary schools in Owerri North Local Government Area (LGA). The academic staff members selected includes junior and senior staff members, as well as male and female staff. Sixty-six teachers, which constitute the population of academic staff of selected from secondary school makes up the sample for the study. Stratified random sampling technique was used for sample selection. Self structured questionnaire was the instrument used for data collection. The method of data analysis used on this research work is ANOVA statistics. Based on the summary of the findings, Gender to a high extent, influences the leadership style used in classroom teaching and learning process. The result also reveals that majority of secondary school teachers in Owerri North used democratic leadership style more than other types of leadership styles. Having listed some findings of the research work, it is necessary to make recommendation. Both male and female teachers should be exposed to constant and relevant seminars, workshop by the school management boards in order to ensure that these teachers are equipped with better understanding of leadership style as well as better combination of these styles.
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Heat transfer augmentation in 3D internally finned and micro-finned helical tube

- Li, Longjian, Cui, Wenzhi, Liao, Quan, Mingdao, Xin, Jen, Tien-Chien, Chen, Qinghua

Authors: Li, Longjian , Cui, Wenzhi , Liao, Quan , Mingdao, Xin , Jen, Tien-Chien , Chen, Qinghua
Date: 2005
Subjects: Helical tubes , Finned tubes , Heat transfer
Type: Journal
Identifier: uj:5263 , http://hdl.handle.net/10210/14932
Description: Experiments are performed to investigate the single-phase flow and flow-boiling heat transfer augmentation in 3D internally finned and micro-finned helical tubes. The tests for single-phase flow heat transfer augmentation are carried out in helical tubes with a curvature of 0.0663 and a length of 1.15 m, and the examined range of the Reynolds number varies from 1000 to 8500. Within the applied range of Reynolds number, compared with the smooth helical tube, the average heat transfer augmentation ratio for the two finned tubes is 71% and 103%, but associated with a flow resistance increase of 90% and 140%, respectively. A higher fin height gives a higher heat transfer rate and a larger friction flow resistance. The tests for flow-boiling heat transfer are carried out in 3D internally micro-finned helical tube with a curvature of 0.0605 and a length of 0.668 m. Compared with that in the smooth helical tube, the boiling heat transfer coefficient in the 3D internally micro-finned helical tube is increased by 40–120% under varied mass flow rate and wall heat flux conditions, meanwhile, the flow resistance is increased by 18–119%, respectively.
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