oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

匹配条件: “ Emana Akpan” ,找到相关结果约180条。
列表显示的所有文章,均可免费获取
第1页/共180条
每页显示
Proximate Composition and Phytochemical Constituents of Aspilia africana (Pers) C. D. Adams & Tithonia diversifolia (Hemsl) A. Gray STEMS (Asteraceae)
Uduak Essiett*, Emana Akpan
Indian Journal of Pharmaceutical and Biological Research , 2013,
Abstract: Proximate composition and phytochemical constituents of stems of A. africana and T. diversifolia(Asteraceae) were investigated. The stems of these species contain anti-oxidant, anticancer, anti-tumor,anti-viral, anti-inflammatory and anti-allergic properties which cures malaria, skin diseases, athlete’s foot,asthma, gonorrhoea and to stop bleeding. The stems of these two species revealed the presence offlavonoids, tannins, saponins and cardiac glycosides. The proximate analysis of the stems of A. africanaand T. diversifolia showed the moisture content of 15.7% and 20.6%, total ash of 6.10% and 6.55%, acidinsoluble ash of 0.55% and 0.33%, sulphated ash of 18.8% and 14.0%, protein content of 7.87% and9.62%, fat of 3.68% and 4.21%, fibre of 12.30% and 15.82%, carbohydrate of 75.97% and 70.35%, volatileether soluble of 7.33% and 1.66%, water soluble of 3.33% and 0.33% and diluted alcohol soluble of 5.33%and 5.66%. The results of this study suggest the popular use of A. africana and T. diversifolia in herbalmedicine.
Analysis of vulnerability and resilience to climate change induced shocks in North Shewa, Ethiopia  [PDF]
Gutu Tesso, Bezabih Emana, Mengistu Ketema
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.36106
Abstract: This article analyzes the vulnerability and resilience levels of farm households in North Shewa, Ethiopia, using a survey of 452 households. Agro ecological based classification was done to analyze vulnerability to climate change induced shocks. Integrated vulnerability analysis approach was employed to develop indexes for socioeconomic and biophysical indicators. The indicators have been classified into adaptive capacity, exposure and sensitivity to climate change impact. Then Principal Component Analysis was used to compute vulnerability index of each agro ecological zone. The result shows that farmers living in the highland areas were very much vulnerable to natural shocks compared to those living in the lowland area. In order to identify and analyse the determinants of resilience to climate change impacts, ordered probit model was used. Households were classified into three categories based on the time they take to bounce back after natural shocks. The model outputs indicate that farmers with better investment on natural resource management, access to market, better social network, access to credit, preparedness, saving liquid assets, access to irrigation and better level of education exhibited greater level of resilience during and after climate change induced shocks.
Determination of Molecular Mass of Strong Acids by Differential Temperature Model (DTM) Using H3PO4 and HBF4 for Classical Demonstration  [PDF]
I. A. Akpan
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.36007
Abstract:

A new chemical hypothesis based on the differential temperature model (DTM) for estimation of molecular masses of some strong acids (H2SO4, HNO3 and HCl) in solutions have previously been propounded and tested theoretically and analytically by the author. The results were published in the Bulletin of Pure and Applied Sciences–Chemistry in 2012. The changes in temperature following various dilutions of the acids were found to be proportional to their molecular properties. The new chemical hypothesis and model is hereby tested on H3PO4 and HBF4 and their exact molecular masses have been evaluated analytically and theoretically. The validity of the hypothesis and the model is hereby presented for chemical proof and adoption to theory by chemists.

Adomian Decomposition Approach to the Solution of the Burger’s Equation  [PDF]
Iyakino P. Akpan
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.53030
Abstract: Adomian decomposition method is presented as a method for the solution of the Burger’s equation, a popular PDE model in the fluid mechanics. The method is computationally simple in application. The approximate solution is obtained by considering only the first two terms of the decomposition in this paper. Numerical experimentation shows accuracy of a minimum error of order five for various space steps and coefficient of kinematic viscosity. The method is considered high in accuracy.
A time series analysis of climate variability and its impacts on food production in north Shewa zone in Ethiopia
G Tesso, B Emana, M Ketema
African Crop Science Journal , 2012,
Abstract: North Shewa is among the areas in Ethiopia hardest hit by climate change (CC), mainly through frequent occurrence of CC induced hazards like flooding, insect outbreaks, hailstorm, alien weeds, disease and pests, droughts and all others which are a result of CC. Time series data collected from the Central Statistical Authority of Ethiopia and the National Meteorological Agency of Ethiopia were employed to examine the variability in the trends of precipitation and temperature over the period of three decades. An attempt was made to measure the number of people and area of land vulnerable to CC induced shocks over a time scale. Also, estimation of the impacts of CC on food production was done using an econometric model; where climate variables together with other factors were set to be determinant of food production over time. The co-integrated Vector Auto Regressive and Error Correction Models were employed to empirically analyse the impact of CC factors on food production. The estimated results show that food production was significantly affected by improved technology, area under irrigation, manure usage, Meher rain and temperature, while fertiliser application and Belg rain were found to be less significant in the model. The Johannes’ approach revealed that 90% of the variation in productivity was explained by area under irrigation, area covered by manure per hectare, the change in usage of improved variety, and the three climate parameters (Meher Rain, Belg rain and Average temperature). Le Nord du Shewa en Ethiopie est parmi les régions les plus affectées par les effets du changement climatique (CC), comme les inondations, principalement par des catastrophes fréquents liés au CC comme les inondations, les infestations d’insectes, la grêle, les herbes envahissantes, les maladies, pestes, la sécheresse et autres conséquences dérivant du CC. Une série des données chronologiques collectées dans l’Office central de la statistique et l’agence éthiopienne de la météorologie était utilisée pour examiner la variabilités dans les tendances de la précipitation et la température au cours d’une période de trois décennies. Un effort a été fait pour déterminer le nombre de personnes et les entendues de terre affectées par les effets du CC au cours du temps. Aussi, l’impact du CC sur la production vivrière était estimé sur base d’un modèle économétrique où les variables-climat étaient intégrées comme déterminants de la production vivriere au cours du temps. Le Vecteur co-intégré Auto Régressif et les modèles dit de la Correction d’erreurs étaient employés pour l’analyse empirique de l’impact des facteurs du CC sur la production vivriere. Les résultats prédits montrent que la production vivrière est significativement affectée par la technologie améliorée, l’espace sous irrigation, l’utilisation du fumier, la pluie de Meher et la température alors que l’application d’engrais et la pluie de Belg sont moins signifiants dans le modèle. L’approche de Johannes a rév
Rethinking Security in Nigeria: Conceptual Issues in the Quest for Social Order and National Integration
W Akpan
African Sociological Review / Revue Africaine de Sociologie , 2008,
Abstract: Dapo Adelugba and Philip Ogo Ujomu, eds., "Rethinking Security in Nigeria: Conceptual Issues in the Quest for Social Order and National Integration" Dakar, CODESRIA, 2008. x plus 162. Reviewed by: Wilson Akpan Department of Sociology University of Fort Hare East London South Africa
Putting oil first? Some ethnographic aspects of petroleum-related land use controversies in Nigeria
Wilson Akpan
African Sociological Review / Revue Africaine de Sociologie , 2005,
Abstract:
Curbing the Global Culture of Violence in Nigerian Secondary Schools: The Role of School Administrators
RJ Akpan
African Research Review , 2009,
Abstract: The interactions of learners from distant contrasting cultures through the use of modern communication technologies are integral part of global learning experience leading to globalization. Globalization rides on the crest of technological and information revolution and has numerous gains. Unfortunately, globalization also breeds violence and conflicts. In Nigeria today, violence is one of the major causes of death for the adolescents. Teaching and earning have been impaired by violence in schools. This paper suggests administrative strategies to curb the escalation of violence among the youths so that Nigerians can maximally enjoy the benefits of globalization.
Road Map to Failed State: The Neuxs Between Bad Governance and Failed State
Felix Akpan
Pakistan Journal of Social Sciences , 2012,
Abstract: The essential argument of this study is that Nigeria has remained in lockstep with violence and instability since independence in 1960, mainly due to the failure of past and present leaders to effectively manage and/or reduce conflict drivers within the country. To surmount this problem and prevent the country from careening towards the vortex of a failed state, the study recommends the emergence of leaders that are honest, sincere and committed to social justice, equity, rule of law and other democratic values that help to bond society and promote stability. This is what the library retrieval technique, the methodology employed in writing this study, suggests.
The impact of urbanization and institutions of higher education on Houston Texas’ Third Ward Community
AI Akpan
Journal of Applied Sciences and Environmental Management , 2006,
Abstract: University towns are influenced by the features of urbanization and impact greatly on the health of the inhabitants. This paper evaluates the impacts of urbanization on the Third Ward communities that are located within Texas Southern University and the University of Houston. The paper further assesses how characteristics of the urban environment may have affected the population health. The historical background of the Third Ward Houston Texas is first reviewed to determine the extent to which urbanization and the presence of universities have impacted on the quality of life of the residents. The overall effects of urbanization are reviewed using all the available literature with broad emphasis on the physical, and social environments, and access to health and social services. Irrespective of the presence of universities and colleges, the surrounding neighborhood communities of the Third Ward Houston continue to face formidable historic challenges to improving public health and general quality of life. Although, urbanization has brought about reinvestment initiatives, changing demographics, and growth creating changes that offer new opportunities for improving health while requiring that health systems be adapted to residents' health needs, however, the communities remain stagnant and unique. Ultimately, the key factors affecting the quality of life in the Third Ward communities are the physical environment, the social environment, and access to health and social services. Overall, the neighborhood communities of the Third Ward do not seem to respond positively to developmental influence of the universities and colleges and are negatively impacted by urbanization. It is suggested that improvement in the Third Ward areas should require setting local, state, and national agendas for progress. Therefore, certain priorities must be put in place namely, development must reorient around the educational and population dynamics, including cultural diversity, and the growing numbers of elderly. @JASEM
第1页/共180条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.