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Search Results: 1 - 10 of 585851 matches for " P.A. Kuale "
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Fault Events Reduction in Electric Power Distribution Reliability Assessment Using Pareto Analysis
E.A. Ogujor,P.A. Kuale
International Journal of Electrical and Power Engineering , 2012,
Abstract: Identification of the significant few faults in Electric Power Distribution Systems (EPDS) is very crucial in reliability assessment. This study presents the application of Pareto analysis in capturing the faults that, if attended to, will increase the reliability of Electric Power Distribution Systems. Historical power outage data in 2004 were collected from the monopolistic operator of the Nigerian power system, National Electric Power Authority-NEPA (now unbundled and called Power Holding Company of Nigeria, (PHCN) Plc) on the four feeders: Uselu, Ugbowo, Eguadaiken and FGGC Road feeders radiating from the 2 15 MVA transformers, 33/11kV Ugbowo injection substation were collected and analysed using Microsoft Access database. The substation serves about 17537 customers. The Pareto charts were then plotted using the line-column in two-axis of Microsoft Excel spreadsheet. The results obtained showed that attending to load shedding, load shedding and earth faults, load shedding and 33kV line failures, load shedding in the FGGC Road, Ugbowo, Uselu and Eguadaiken feeders will lead to reliability increase from 0.78879-093353, 0.69483-0.91959, 0.78797-0.94413 and 0.75938-0.93032, respectively. It is apparent that the reduction of load shedding as suggested by the analysis implies the need for the increase of Electric power generation in Nigeria to meet demand and system losses. The other faults that are not captured by this analysis will cost more to solve than the derivable benefits.
Using Reliability Indices-Markov model in Electric Power Distribution Reliability Assessment
E.A. Ogujor,P.A. Kuale
International Journal of Electrical and Power Engineering , 2012,
Abstract: A Reliability Indices-Markov model for up-coming year reliability prediction suitable for Electric Power Distribution Reliability Assessment is presented. This model was developed using the IEEE Std 1366TM 2003 and Markov chain. The model was calibrated with 2003 power outage data and validated using 2004 data collected from the monopolistic operator of the Nigerian power system, National Electric Power Authority (now unbundled and called Power Holding Company of Nigeria, (PHCN) Plc) on the four feeders: Uselu, Ugbowo, Eguadaiken and FGGC Road feeders radiating from the 2 15 MVA transformers, 33/11kV Ugbowo injection substation. A maximum error in prediction of -0.12% was obtained in the Eguadaiken feeder while a minimum error of -5.5% is obtained in Ugbowo feeder. Due to these low error margins, the model can be used confidently.
Estimation of Technical Losses in the Nigerian 330KV Transmission Network
O.S. Onohaebi,P.A. Kuale
International Journal of Electrical and Power Engineering , 2012,
Abstract: In this study, the estimation of technical power losses associated with the Nigerian 330KV transmission network was carried out. In order to estimate the peak power losses, the 330 KV network was simulated in the computer using the Newton Raphson method in the Power World Simulator ( PWS ) software environment. The annual technical energy losses in the network was calculated based on the Load Factor (LF) and Loss Load Factor (LLF) from hourly readings and empirical formulae. The annual energy loss for 2005 was computed to be 337.5 GWH amounting to over two billion, six hundred Naira.
Effect Of Flyash On The Mechanical, Thermal, Dielectric,Rheological And Morphological Properties Of Filled Nylon 6  [PDF]
Suryasarathi Bose, P.A. Mahanwar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.32007
Abstract: Fillers are used along with various commodities as well as engineering polymers to improve the properties of polymers. The performance of filled polymers is generally determined on the basis of the interface attraction of filler and polymers. Fillers of widely varying particle size and surface characteristics are responsive to the interfacial interactions with polymers. The present study deals with the effect of particle size and its concentration on the properties of flyash filled nylon 6.
Effect of Particle Size of Filler on Properties of Nylon-6  [PDF]
Suryasarathi Bose, P.A. Mahanwar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.31003
Abstract: Particulate reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering plastics. In this study the effects of adding mica with variable particle size on the mechanical, thermal, electrical and rheological properties of nylon-6 was investigated. Composites of nylon-6 with varying concentrations (viz. 5 to 40 weights %) of mica were prepared by twin screw extrusion. The composite showed improved mechanical, thermal as well electrical properties on addition of filler. It is also observed that mechanical properties, electrical properties as well as thermal properties increases with decrease in particle size.
Estadística no extensiva de Tsallis en el latido cardiaco de seres humanos sanos
Ritto, P.A.;
Revista mexicana de física , 2011,
Abstract: it is studied the mit-bih normal sinus rhythm database applying to the heartbeat time-series ad hoc, a statistical technique of analysis based on the wavelet and hilbert transforms. with that technique it was previously found, that there is a nonlinear, collective and intrinsic dynamical behavior in the heartbeat during the night and day hours, from 1-64 heartbeats. now it is shown, that using the biorthogonal wavelet bior 3.1 such a behavior reaches the scale 1024 in periods ~ 24 h without being affected by the circadian cycle in its statistic. that result confirms, that the circulatory system is out of equilibrium. furthermore, consistently to the statistics of tsallis, to the healthy human being it corresponds the nonextensive parameter q = 1.70 ± 0.01.
Pectoral spine size in Synodontis schall (Teleostei: Mochokidae) from Asa Lake, Ilorin, Nigeria
Revista de Biología Tropical , 2000,
Abstract: the pectoral spines of synodontis schall (n = 813) were examined for 24 months. mean length for the right (3.2 cm) and left (3.1 cm) pectoral spines were not significantly different [p 0.05];. however, the male and female pectoral spine lengths were significantly different (p < 0.05). a fractured pectoral spine in one of the specimens was shorter than the other. the fracture which could be deleterious to balancing, feeding and reproductive activities was attributed to an injury rather than to genetic or epigenetic defects.
Physical factors and their influence on fish species composition in Asa Lake, Ilorin, Nigeria
Revista de Biología Tropical , 2009,
Abstract: the effect of physical factors on fish species composition was studied during 12 months in asa lake, nigeria. fish and water samples were collected bimonthly (march 2003 to february 2004) in the morning. fish samples were caught with gill nets set at the surface and bottom habitats. there were 11 fish families and 21 species. osteoglossidae, anabantidae, channidae, schilbedae and cyprinidae were rare and occurred seasonally in fishermen catches, while mormyridae, cichlidae, mochokidae, characidae, bagridae and clariidae showed less variation and were more common. characidae and cichlidae were the most abundant (23.0 and 18.6% respectively) while osteoglossidae, channidae and anabantidae were the least (1.7, 2.1 and 2.3% respectively). clariidae and mormyridae had the highest weight with 16.0% and 12.3% respectively, while anabantidae had the lowest (3.4%). surface water temperatures were generally higher than air temperatures during the afternoon, except from january to march when air temperatures were high (28.1 to 28.7 oc) due to low relative humidity (39 to 70%). in the morning, surface water temperatures (25.5 to 26.3 oc) became higher than air temperatures (25.2 to 26.0 oc) from may to december, when relative humidity values were also high (50 to 88%). the differences between surface and bottom water temperatures was generally higher (0.7 to 3.1 oc; p < 0.05) in the afternoon (0.2 to 0.8 oc) due to sunlight. temperature differences in the surface and bottom waters were usually higher during the dry season (p < 0.05), for similar reasons. captures were higher in the dry season when the fish concentrated in the warmer, steadier and scarcer water. minimal and maximal temperatures were different for surface and bottom waters (p < 0.05). however, there were no marked variations in temperature patterns or species distribution. rev. biol. trop. 57 (1-2): 167-175. epub 2009 june 30.
Man-made lakes, ecological studies and conservation needs in Nigeria
Revista de Biología Tropical , 2002,
Abstract: the benefit derived from the creation of man-made lakes in nigeria and other developing countries is usually associated with great risks. whenever we establish a dam, it appears we dam the inherent consequences to the detriment of man and bis environment. debts were incurred by the countries concerned, man and animals were displaced, arable lands destroyed including degradation of forest and wild life resources. the creation of dams have also ignored the prevention of man and bis life stock from the inherent spread of water borne diseases. the purpose for which a dam is created is threatened if man is indiscriminately exposed to the risk of water borne diseases. the poor and uneconomic management of the fish resources is also another major issue of concern. in order to tap the full potentials of reservoir projects and to promote conservation, it is important to have a round table talk involving all stake holders during the planning stage of such projects. therefore apart from the engineering works, there is also need for collaboration with all experts from relates fields especially the biologists, sociologists and economists for bio-socio-economic reasons during the planning and implementation stages of dam projects in nigeria and other developing countries.
On Issues of Labelling in the "Dictionnaire Fran ais–Mpongwé": A Case-study
P.A Mavoungou
Lexikos , 2005,
Abstract: Dictionaries contain lexicographic data whose occurrence is restricted to certain geo-graphical areas, subject fields, professions, etc. It is part of the duties of the lexicographer to give an account of such deviations to ensure a successful retrieval of the information on the part of the user. This contribution presents a discussion on labelling issues in the Dictionnaire Fran ais–Mpongwé. Although the main focus is on the presentation of different types of labelling as well as problems in labelling, textual condensation procedures and mediostructural representations (to-gether with some aspects of the user perspective) are also critically evaluated. It is shown that these procedures reveal some inconsistencies which are not accounted for in the outer texts (front matter and back matter texts) of the dictionary. Finally suggestions are made for the improvement of the access structure of this dictionary.
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