Rivers State University of Science And Technology

Port Harcourt, Nigeria

Rivers State University of Science and Technology is a University located in the Diobu area of Port Harcourt, Rivers State, Nigeria. The University has staff strength of 3,000 and a student population of 17,000. Wikipedia.

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Luiselli L.,Rivers State University of Science And Technology | Luiselli L.,IDECC Institute for Development
Herpetological Journal | Year: 2017

Emys orbicularis persica is one of the ecologically least known subspecies of the widespread European pond turtle. Populations of this subspecies were studied in springtime at two extended wetlands of Azerbaijan, and data on density, habitat use, and food habits were collected. These turtles exhibited a mono-peaked diel activity pattern, with peaks during midday hours. Highest mean estimated densities were found in reed-bed habitat (9.51 individuals × ha-1) and in the open water habitat (lake) (9.12 individuals × ha-1), with much lower values in seasonally inundated grasslands (6.0 individuals × ha-1) and no turtles being found in temporary ponds. Density of reeds did not influence the selection of micro-habitat by turtles. Sex-ratio was even, and females attained larger size than males. Diet was carnivorous and relatively specialised, with large larvae of aquatic beetles (Hydrophilus piceus) accounting for by far the main prey item. In this regard, the food habits of the Azerbaijan turtles appeared more specialised than those of other E. orbicularis populations from elsewhere. © 2017 British Herpetological Society. All rights reserved.

Onwuteaka J.,Rivers State University of Science And Technology | Ugbomeh A.,Rivers State University of Science And Technology | Onyebuchi O.A.,Rivers State University of Science And Technology
Annual Research and Review in Biology | Year: 2017

A two-year data set of Periwinkle (Tympanotonous fuscatus) population from a deforested mangrove area was used to assess its population dynamics. Periwinkle snail samples in one hundred (100) 1 m2 quadrats were collected, each in 2015 and 2016. The summary statistics of the periwinkle population show a mean density of 21 indv/m2 in 2015 and 12 indv/m2 in 2016. The length parameter ranged from 0.9 cm-3.6 cm (mean 2.00±0.33) in 2015 and 1.4 cm-5.1 cm (mean 1.76±0.43) in 2016 while the weight parameter ranged from 1.5 g-5 g (mean 1.50±1.51) and 0.4 g-2.53 g (mean 0.70±0.48). The population density indicated a significant change between 2015 and 2016. The total abundance of periwinkle snails between the years declined by forty (40%) percent, varying from a density of 2090 snails in 2015 to 1192 snails in 2016. The distribution statistics also showed that the likelihood of obtaining seven (7) snails in 2016 collections with 1 m2 quadrats declined by 10%; and 18 and 29 snails by sixty-five (65%) percent. The significant difference in abundance values using the Student’s t variance estimate (p<0.05) was also observed (p<0.05) for the variance estimates of the length and weight categories. In the length category, evidence of significant change was indicated by the decline in obtaining the class interval of 1.2 cm-1.6 cm by ten (10%) percent in 2016 collections. Further evidence of significant change in population characteristic was also observed in the weight parameter where the weight class 3 g to 5.5 g was absent in the 2016 collections. The relationship between length-weight was non-collinear in 2015 year collections with a very low R2 = 0.007, indicating that the contribution of shell length to body weight can only be predicted by 0.3%. In contrast, in the 2016 collections, the length-weight relationship returned a value of R2 = 0.646971 indicating that the contribution of the shell length to body weight can be predicted by sixty percent (60%). These differences in population characteristics were interpreted as evidence of the snail response to interplay of environmental conditions between the dates of collection which were similar. Harvesting pressure and indiscriminate habitat destruction are noted as extreme drivers that can likely overwhelm the natural balance of ecological factors. Although the influences of habitat conditioning factors were not discussed, evidence of the quantitative variation in the population dynamics is given to direct future research in conservation. © 2017 Onwuteaka et al.

Onoshakpor R.M.,Rivers State University of Science And Technology
IEEE International Conference on Adaptive Science and Technology, ICAST | Year: 2015

The growing demand for electric power supply in developing countries has driven system operators to seek for better ways to harness more sources of sustainable power. The growth of power Networks and the number of elements which constitutes them has tremendously increased. This has created the need for an increased capacity and diligence in the sustenance of power systems in such countries. The adoption of a holistic approach in the management and planning of power systems cannot be over emphasized. This brings about the need for system maintenance management that encompasses; planning, monitoring and appraisal of maintenance activities in order to sustain growth and productivity. The work highlights due diligence and standard maintenance practices applied in other developed countries where efficiency is recorded. This work looks at some of those practices from the Nigerian context. © 2014 IEEE.

Oleforuh-Okoleh V.U.,Rivers State University of Science And Technology
Asian Journal of Animal Sciences | Year: 2016

The aim of this study was to predict hatchability using external egg quality traits. Seven hundred and twenty eggs were collected from inbred populations of three strains of layer-type chickens comprising of two exotic strains: Black Olympia (BO), H and N brown nick (H and N) and the Nigerian Local Chicken (NLC) at 40 weeks of age. The external egg quality traits measured include Egg Weight (EW), Egg Shape Index (ESI), Shell Weight (SW) and Shell Thickness (ST). Highly significant variations existed between the two exotic strains (BO and H and N) and the NLC in all traits expect actual hatchability. Eggs from BO and H and N were 27.76 and 28.34% heavier than those from the NLC (p<0.01). Actual hatchability percentage ranged between 87.73-88.24%. All egg quality traits studied were negatively correlated with hatchability (EW-0.27, ESI-0.38, SW-0.24 and ST-0.68). The correlation between ESI, ST and hatchability were significant (p<0.01). The multiple linear regression analysis revealed that all the traits except EW had significant (p<0.01) linear effect on hatchability with a coefficient of determination (R2) of 0.698. The estimated hatchability prediction model was y = 124.169-0.007EW-0.358ESI+0.639SW- 37.283ST. The high R2 obtained in this study indicates that the variables employed in predicting the model were adequate and therefore suggests the likelihood that the various external egg quality traits influenced hatchability and could be interpreted in an integrated manner, rather than from a mutually exclusive individual basis. © 2016 V.U. Oleforuh-Okoleh et al.

Zabbey N.,University of Port Harcourt | Uyi H.,Rivers State University of Science And Technology
Marine Pollution Bulletin | Year: 2014

Preliminary impact assessment of two large oil spill incidents at Bodo Creek, in the Niger Delta, was undertaken, focusing on intertidal macrozoobenthos. Post-spill number of species and abundance were measured against recent pre-spill baseline data from the same study area. Results show that surface and infauna communities suffered severe reduction in abundance and number of species reduced by 81% after the spills, with two of the resampled sites having no taxa at all. Capitella capitata populations increased several-fold over pre-spill numbers. The impact of the oil spills is discussed in relation to local livelihoods and ecosystem integrity. The Niger Delta endemic lucinid, Keletistes rhizoecus, is proposed as a potential bioindicator for monitoring hydrocarbon contamination in Niger Delta estuaries. © 2014 Elsevier Ltd.

Johnarry N.T.,Rivers State University of Science And Technology
International Review of Civil Engineering | Year: 2016

The buckling strength of columns is readily brought home to designers through the Euler length factors, \elf\, but vibration analysis still remains less design-oriented. This study develops an effective-vibrating-length, \evl\ from \elf\ and more easily computes the frequencies of any frame assemblage; in essence the \evl\ is a pin-ended bar in uniform mass replacing the given frame. The use of the \evl\ by-passes assumed shape-functions in the Rayleigh quotient method. The introduction of length allows spectral responses to be found easily. The \evl\ by-passes in-determinate structural analysis to find sway and deflection accurately in an elementary way. The effective-vibrating-length does for vibration what the Euler-length-factor does for buckling. © 2016 Praise Worthy Prize S.r.l. All rights reserved.

Brisibe W.G.,Rivers State University of Science And Technology
A/Z ITU Journal of the Faculty of Architecture | Year: 2016

With the architecture of prehistoric sites and ancient civilizations constantly requiring new methodologies and forms of analysis, a new field of research the Archaeology of Architecture or ‘Archaeotecture’ has been designed to merge theory and method for that purpose. It combines aspects of ethnography, anthropology, archaeology and architecture to understand the material context of human social relations, culture and production as seen via architecture through time. Similarities have been drawn between prehistoric architecture and contemporary vernacular architecture of hunter-gatherer societies. This paper takes advantage of these similarities by employing methods used in ‘archaeotecture’ to ascertain cross-spatial and cross-temporal variations in the vernacular architecture of Ijo migrant fishermen in Nigeria. The Principal Co-ordinate Analysis which is a quantitative technique adopted from archaeology was applied in the analysis of architectural data to ascertain variations in vernacular built forms. The results indicated the existence of variations as well as the cultural transmission mechanisms that may have influenced these variations. The paper concludes by discussing and recommending the use of interdisciplinary cross-pollination of methods in examining variations in both vernacular and contemporary architectural studies. © 2016, Istanbul Teknik Universitesi, Faculty of Architecture. All rights reserved.

Namasivayam A.M.,Queen Mary, University of London | Korakianitis T.,Queen Mary, University of London | Crookes R.J.,Queen Mary, University of London | Bob-Manuel K.D.H.,Rivers State University of Science And Technology | Olsen J.,University of New South Wales
Applied Energy | Year: 2010

Dual-fuelling in compression-ignition (CI) engines is a mode of combustion where a small pilot injection of high-cetane fuel (i.e. diesel) ignites a premixed high-octane fuel (i.e. methane) and air mixture. This allows conventional CI engines to lower their emissions of smoke and nitrogen oxides (NOx) while maintaining their high thermal efficiencies. However, poor ignitability of the main fuel-air charge results in increased emissions of unburnt hydrocarbons (HC) and carbon monoxide (CO). Conventional pilot fuels such as diesel and biodiesel (methyl esters transesterified from raw plant oil) have been researched extensively in prior work, showing that in terms of performance and emissions they perform fairly similarly. This is because the physical, chemical and combustion properties of various methyl esters are comparable to those of conventional diesel. In order to reduce these emissions of HC and CO, alternative pilot fuels need to be considered. As fuels employed during normal CI engine operation, both dimethyl ether (DME, a gaseous CI engine fuel) and water-in-fuel emulsions (conventional biodiesel mixed with varying concentrations of water) have shown that they reduce smoke and NOx emissions significantly, while improving combustion quality. In this work, the performance of DME and water-in-biodiesel emulsions as pilot fuels was assessed. It was seen that the water-in-biodiesel emulsions did not perform as well as expected, as increased HC and CO emissions coupled with a mild change in NOx levels was encountered (compared to conventional pilot fuel, in this case neat biodiesel). The emulsions performed very poorly as pilot fuels below a certain BMEP threshold. DME, while producing higher levels of HC and CO than neat biodiesel, managed to reduce NOx significantly compared to neat biodiesel. Emissions of HC and CO, while higher than neat biodiesel, were not as high as levels seen with the emulsions. Thermal efficiency levels were generally maintained with the liquid pilot fuels, with the DME pilot producing comparatively lower levels. © 2009 Elsevier Ltd. All rights reserved.

Igoni A.H.,Rivers State University of Science And Technology
Agricultural Engineering International: CIGR Journal | Year: 2016

The design of a continuously stirred tank reactor (CSTR) for the processing of municipal solid waste (MSW) to produce biogas required an investigation of the kinetic parameters of the substrate relevant to the determination of reactor dimensions. The determination of these parameters is usually complicated with an experimental CSTR set-up. Therefore, it is preferred to use a batch-scale experimentation to determine the parameters. However, because of the differences between the batch and continuous processing, the batch experimentation parameters cannot be directly applied to the design of the CSTR. Some previous researchers had made a comparative evaluation of the batch and continuous processing systems, and developed a procedure for adapting batch experimentation data to the design of continuous reactors. In this study, laboratory scale batch digesters were used to determine the kinetic parameters of MSW, with the said procedure, they were adapted to the design of a CSTR for the digestion of MSW in the production of biogas. This paper presents a successful application of batch experimentation data on MSW to the design of a CSTR for MSW in Port Harcourt metropolis, Nigeria. © 2016, Int. Comm. of Agricultural and Biosystems Engineering. All rights reserved.

Vitus O.L.,Rivers State University of Science And Technology
Proceedings - SPE Annual Technical Conference and Exhibition | Year: 2014

This research work presents an investigation on a wave physics approach to pressure transient analysis. It is hinged on the view that a pressure transient phenomenon has an associated wave behaviour. A Reservoir pressure transient partial differential equation is developed by importing the pressure transient velocity into the general wave partial differential equation. The equation is then solved using the Boltzmann transformation. The resulting equation presents a mathematical definition of a reservoir pressure transient from a wave physics viewpoint. Spectral and Time Series plots of the model and field data predicted pressure transients are presented. Observation shows a similar trend in behaviour for both plots and discrepancies possibly due to reservoir heterogeneities, noise in data and the likelihood of a counterpressure effect from the restrictions. Copyright 2014, Society of Petroleum Engineers.

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