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Search Results: 1 - 10 of 325310 matches for " S. Sanni "
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On a class of nonlocal degenerate reaction-diffusion equations with localized nonlinear diffusion term
S. A. Sanni
International Journal of Mathematical Analysis , 2013,
Abstract: We study a class of second order nonlocal degenerate semilinearreaction-diffusion equations with localized nonlinear diffusion term. Undera set of conditions on the localized nonlinear diffusivity and nonlinearnonlocal source term, we prove global existence and uniquenessresult in the whole of some weighted Sobolev’s spaces. Furthermore,we prove nonexistence of smooth solution or blow-up of solution undersome other set of conditions. Finally, we give illustrative examples forwhich our results apply.
Animal Traction: an Underused Low External Input Technology among Farming Communities in Kaduna State, Nigeria
Adunni Sanni, S.
Tropicultura , 2008,
Abstract: In spite of the slow rate of adoption of animal traction (AT) technology in West Africa, the potential benefit of the technology, in terms of increase in hectares cultivated and the reduction in drudgery has been a subject of discussion by researchers. This paper uses a linear programming and binary choice probit model to analyze the benefits and constraints to AT technologies taking into consideration socio-economic and institutional factors and perception variables. One hundred and twenty households from Maigana and Yakawada villages in Kaduna State were enumerated by a simple random sampling technique using both structured and unstructured interview procedures. The result revealed considerable under-exploitation of AT technology in the study location. The partial use of AT technology for tillage operation only increased gross margin by 32% and labor bottlenecks experienced in the peak of the season can be reduced by 43%. However, the increase in gross margin is over 78% when the full AT technology package is used. The general trend in the models showed that by adopting the complete package of the technology, the full potential could be exploited. The size of family labor force substantially influenced the adoption behavior of the household while the selected perception variables were quite useful in explaining household's perception of the technology. Conversely, the use of tractors showed a highly significant but negative relationship with the adoption of AT technology. Households' managerial know how, financial constraint and the family labor capacity limits the benefits derived from the technology. These results suggest that farm mechanization using complete AT package is a viable panacea for agricultural intensification and increased productivity among the smallholders in the northern guinea savanna ecology of Nigeria. The paper concludes with pragmatic steps of how the identified constraints can be eliminated to sustain holistic adoption of AT technology and exploit its full potential benefits.
Publication productivity and citation analysis of the Medical Journal of Malaysia: 2004 - 2008
S. A. Sanni
Computer Science , 2013,
Abstract: We analysed 580 articles (original articles only) published in Medical Journal of Malaysia between 2004 and 2008, the resources referenced by the articles and the citations and impact received. Our aim was to examine article and author productivity, the age of references used and impact of the journal. Publication data was obtained from MyAIS database and Google Scholar provided the citation data. From the 580 articles analyzed, contributors mainly come from the hospitals, universities and clinics. Contributions from foreign authors are low. The useful lives of references cited were between 3 to 11 years. ISI derived Impact factor for MJM ranged between 0.378 to 0.616. Journal self-citation is low. Out of the 580 sampled articles, 76.8% have been cited at least once over the 5 years and the ratio of total publications to citations is 1: 2.6.
Effect of Heat Treatment on Microstructure and Mechanical Properties of NF6357A Cast Alloy for Wear Resistance Application  [PDF]
J. O. Agunsoye, V. S. Aigbodion, O. S. Sanni
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011082
Abstract: The solidification structure of the as-cast consists of the matrix structure that is predominantly austenite and precipitated chromium carbide along the grain boundary. Under these circumstances and where the level of impact is relatively modest, such alloys in as-cast condition will perform. However, at higher levels of impact energy, a point is reached where excessive stress are built up within the component and eventually the materials strength is exceeded and the outcome is complete failure in a characteristic stress fracture mode. If this is to be prevented, it is therefore imperative that the casting be subjected to appropriate heat treatment, to obtain a structure which consist of Cr7C3 carbide and martensite at a hardness range of 650-750HB. The microstructure of NF6357A cast chromium steel containing 2.59% C- 0.7%Si-0.91%Mn-18.54%Cr-0.019%P-0.01%S- balance–Fe after appropriate heat treatment such as quenching and tempering process have been characterised by means of optical microscope, micro hardness tester, optical emission spectrometer and charpy testing machine. The results show that oil quenched samples were found to retained microstructural consistency for casting thicker than 120mm section. For economic argument, air quenched castings of less than 120mm thickness is not only cheaper alternative, but it is also environment friendly. The fracture toughness was found to be fairly consistent between 2.4-2.6%C range. However, at higher carbon level, the fracture process is dominated by the presence of segregated carbide network which act as a weak link in the microstructure. This weak link encourages dislocation pile-up and impaired material toughness.
Study of Mechanical Behaviour of Coconut Shell Reinforced Polymer Matrix Composite  [PDF]
Agunsoye J. Olumuyiwa, Talabi S. Isaac, Sanni O. Samuel
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.118065
Abstract: The morphology and mechanical properties of coconut shell reinforced polyethylene composite have been evaluated to establish the possibility of using it as a new material for engineering applications. Coconut shell reinforced composite was prepared by compacting low density polyethylene matrix with 5% - 25% volume fraction coconut shell particles and the effect of the particles on the mechanical properties of the composite produced was investigated. The result shows that the hardness of the composite increases with increase in coconut shell content though the tensile strength, modulus of elasticity, impact energy and ductility of the composite decreases with increase in the particle content. Scanning Electron Microscopy (SEM) of the composites (with 0% - 25% particles) surfaces indicates poor interfacial interaction between the coconut shell particle and the low density polyethylene matrix. This study therefore exploits the potential of agrobased waste fiber in Nigeria as an alternative particulate material for the development of a new composite.
Socio-economic Determinants of Household Fertilizer Use Intensity for Maize-based Production Systems in the Northern Guinea Savannah of Nigeria
S. Adunni Sanni,Werner Doppler
Journal of Applied Sciences , 2007,
Abstract: This study aimed at understanding current status of soil fertility management and the identification of socio-economic characteristics influencing the decision of households on fertilizer use intensity in maize-based production systems in the northern guinea savanna of Nigeria. A total of one hundred and sixty households involved in maize-based production system (2003/2004) were interviewed using structured questionnaire. Data collected were analyzed using descriptive statistics and binary logit model. Analysis revealed that households combine techniques like application of organic and mineral fertilizer and crop planting pattern in maintaining the fertility of their soils. The ratio of N: P2O5: K2O per hectare from both organic and inorganic sources were 49.5:98.3:56.7 kg in Katsina State and 58.7: 109.4: 53.6 kg in Kaduna State. The estimated logit models revealed that fertilizer use intensity is significantly influenced by previous year`s income, land ownership, engagement in off farm activities and years of experience in maize farming.
Effects Of Vitex doniana (Sweet) stem bark aqueous extract on ketamine anaesthesia in rabbits
S Sanni, PA Onyeyili, JG Thliza
Sokoto Journal of Veterinary Sciences , 2005,
Abstract: The effects of Vitex doniana (sweet), black plum, stem bark aqueous extract alone on vital parameters (temperature, respiratory rate, heart rate), and sleeping time as well as the effects of the extract on the same parameters before and after ketamine anaesthesia in rabbits were investigated. Twenty rabbits were randomly separated into four equal groups and were administered 400, 600, 800 and 1200mgkg-1 respectively of the aqueous extract of Vitex doniana (sweet) stem bark intraperitoneally. The temperature, respiratory and heart rates of the rabbits were taken before and after extract administration at 10th, 20th, 30th, 60th and 180th minutes. Fifteen other rabbits were randomly selected and separated into three groups of five each. Group I was administered 50mg/kg of ketamine alone intramuscularly. Groups II and III were administered 200 and 400mg/kg body weight respectively of the extract intraperitoneally 30 minutes prior to the administration of the same dose of ketamine as in group I. Temperature, heart and respiratory rates, as well as onset of, and recovery from, anaesthesia were measured prior to and after the administration of the agents. The administration of the extract alone to rabbits produced increase in temperature and decrease in respiratory rate and in heart rate. The increase in temperature and respiratory rates was associated with presence of reducing sugars in the extract and its analeptic/toxic effects respectively, while the decrease in all the parameters was associated with central nervous system depression. The administration of the extract prior to ketamine administration produced less significant (P<0.05) decrease in respiratory rate and higher percentage decrease in heart rate but no significant (P>0.05) effect on temperature compared with ketamine used alone. It is therefore concluded that the aqueous extract of Vitex doniana (sweet) stem bark used alone altered the vital parameters while it has a reversal action on respiratory rate and it intensifies the depression of heart rate when used prior to ketamine anaesthesia.
Plasma Disposition of Ampicillin following Thiopentone Sodium Anaesthesia in Rabbits (Oryctolagus cuniculi)
S Sanni, FA Lawan, JY Adamu
Nigerian Veterinary Journal , 2011,
Abstract: Nigerian Veterinary Journal, Vol. 32(2): 2011; 97 - 101
Measuring the influence of a journal using impact and diffusion factors
S. A. Sanni,A. N. Zainab
Computer Science , 2013,
Abstract: Presents the result of the calculated IS! equivalent Impact Factor, Relative Diffusion Factor (RDF), and Journal Diffusion Factor (JDF) for articles published in the Medical Journal of Malaysia (MJM) between the years 2004 and 2008 in both their synchronous and diachronous versions. The publication data are collected from MyAis (Malaysian Abstracting & Indexing system) while the citation data are collected from Google Scholar. The values of the synchronous JDF ranges from 0.057 - 0.14 while the diachronous JDF ranges from 0.46 - 1.98. The high diachronous JDF is explained by a relatively high number of different citing journals against the number of publications. This implies that the results of diachronous JDF is influenced by the numbers of publications and a good comparison may be one of which the subject of analysis have similar number of publications and citations period. The yearly values of the synchronous RDF vary in the range of 0.66 - 1.00 while diachronous RDF ranges from 0.62 - 0.88. The result shows that diachronous RDF is negatively correlated with the number of citations, resulting in a low RDF value for highly cited publication years. What this implies in practice is that the diffusion factors can be calculated for every additional year at any journal level of analysis. This study demonstrates that these indicators are valuable tools that help to show development of journals as it changes through time.
Effect of Oral Administration of Aqueous Extract of Khaya senegalensis Stem Bark on Phenylhydrazine-induced Anaemia in Rats
F.S. Sanni,S. Ibrahim,K.A.N. Esievo,S. Sanni
Pakistan Journal of Biological Sciences , 2005,
Abstract: The anti-anaemic effect of Khaya senegalensis stem bark on phenylhydrazine-induced anaemia was carried out in rats. Induction of anaemia was conducted using phenylhydrazine hydrochloride at a dose of 750 mg kg-1 body weight. In vivo investigation showed that oral daily dose of 300 mg kg-1 body weight of the bark aqueous extract of K. senegalensis in rats administered simultaneously with the phenylhydrazine produced significant (p<0.05) anti-anaemic effect probably by protecting the red blood cells against destruction by phenylhydrazine. However, the same oral dose did not show any significant curative effect (p>0.05) after the induction of anaemia using phyenylhdrazine hydrochloride. The phytochemical screening of the aqueous extract of the stem bark of K. senegalensis indicate the presence of carbohydrate, saponin, glycosides and tannins. Also present are important mineral elements necessary for the development and functioning of the body. These include calcium, magnesium, zinc, iron, copper, potassium, and sodium. This study showed that Khaya senegalensis has an anti-anaemic effect.
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