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.

The impacts of meteorological parameters on the seasonal, monthly, and annual variation of radio refractivity

Abstract: Results of the variations of radio refractivity, computed from the measurements of ambient temperature, atmospheric pressure, and relative humidity, were studied in Calabar for a period of 12 years (2005–2016) with the archived data provided by the Nigerian Meteorological Agency (NIMET). Correlation plots and modeling show that refractivity is mostly affected by the water vapor content of the atmosphere, and this means that relative humidity can be used to accurately develop models for the variations of refractivity as the refractivity variation within a year showed an almost uniform value which corresponded to the monthly relative humidity trend. The annual variation of refractivity also corresponded to the annual variation of relative humidity with its highest coming in 2012 with 391 N Units. Results also show that the ambient temperature and the atmospheric pressure in the region are not reducing annually and this has a very significant effect on climate change. On climate change, the obtained meteorological parameters have over the years affected the climate of the region as an increase in annual atmospheric pressure as well as the relative humidity has brought about a steady increase in amount of heat retained on the earth’s surface; this is due to the water vapor (a greenhouse gas) in the atmosphere of this region.

Thermo gravimetric analysis (TGA) of PA6/G and PA6/GNP composites using two processing streams

Abstract: The thermogravimetric (TGA) responses of PA6 composites filled with synthetic Graphite (G) and Graphite nanoplatelets (GNP) each on 5 cumulative loading levels were investigated using two processing streams each of a common processing strain. To determine the effect of the 2 carbon fillers on the thermal stability of unfilled PA6, the temperatures at which 5, 20 and 50 wt% losses occurred were observed for the composites and the unfilled PA6. Weight lost at 460 °C and the carbon char at 600 °C were also noted. Effects of varying extrusion screw speeds as well as sonication amplitudes with time were given cognisance. To evaluate the effect of processing on the thermal response of the composites, two in situ polymerised streams and 2 melt extrusion streams with each set being equivalent in ‘magnitude of strain histories’ were characterised using TGA. The TGA for the unfilled PA6 and its graphite composite were conducted under inert (N2) blanketing and reactive (air) media. Initially, TGA responses of the fillers were studied and both GNP and G remained stable in N2. The onset of weight loss under N2 blanketing for G and GNP were respectively 820 ± 27.6 °C and 777.3 ± 17.7 °C. At temperature close to 900 °C, G showed relatively poorer thermal stability compared to GNP. A residue of 1.3% for G and 2.0% for GNP were left. The thermal stability of the streams G200/3 and G100/6 remained within a close range thus indicating that varying screw speeds and durations did not play a significant role on influence the thermal stability of the melt processed composites. For the composites, thermal stability were comparable with unfilled PA6, especially in the melt-processed systems, while Some changes occurred in the 2 in situ polymerized systems (20/20 and 40/10) which was ascribed to the presence of small molecules from the catalysing species or unconverted monomers.

Assessment of Tourist Perception on Service Quality in the Hospitality Industry in Cross River State

Abstract: Quality service has become a serious issue among scholars in the hotel industry. This arises due to the fact that operators of the industry still find it difficult to understand what a tourist needs “are” at a particular time. This paper critically examines tourist perception in the hotel industry, with specific reference to the joint contribution of the various service quality dimensions, variables to tourist satisfaction in the industry. This research adopted the Parasurama, Berry and Zeithan (1988) method in evaluating tourist perception of service quality in the hotel industry. Three hypotheses were test and the result shows that tourist were not satisfied with the service quality provided by the operators of the hotel industry in Calabar. According to Chu (2001) the success of the hotel industry depends on the quality of services provided by the operators of the industry. Therefore, it is very important for the operators of the industry to understand the expectation of the tourist if the industry must strive effectively. Key words: Service quality, tourist, perception, hotel industry, expectation.