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Search Results: 1 - 10 of 462011 matches for " Inemesit A. Akpan "
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Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by Ciprofloxacin Drug
Inemesit A. Akpan,Nnanake-Abasi O. Offiong
International Journal of Corrosion , 2013, DOI: 10.1155/2013/301689
Abstract: The inhibition of mild steel corrosion in hydrochloric acid solution by ciprofloxacin drug as an eco-friendly and commercially available inhibitor was studied at room temperature by weight loss technique. It was found that the test drug has a promising inhibitory action against corrosion of mild steel in the medium investigated. The inhibition efficiency was found to increase with a corresponding increase in the concentration of the inhibitor. It was also found that the adsorption as well as the inhibition process followed a first-order kinetics and obeyed Langmuir’s adsorption isotherm. 1. Introduction Mild steel is extensively used in industries and as a result corrodes when exposed to various industrial environments and conditions. The application of inhibitors has been said to be amongst the most practicable ways for protection of metals against corrosion, especially in acidic media [1–3]. The inhibitive reactivity of an inhibitor is fundamentally affected by the molecular structure of the inhibiting molecules [4, 5]. Most prominent corrosion inhibitors are organic compounds containing nitrogen, sulphur, oxygen, and phosphorus in their functional groups [6–9]. The mechanism of these compounds has been proposed to be the adsorption, by means of lone pairs of electron, of the organic functional groups on the metal surfaces [10]. Furthermore, a good number of drugs are known to posses most of these qualities, and current research has been geared to identify cheap drugs, which are environmentally safe as corrosion inhibitors [11, 12]. The objective of this present work is to study the inhibition of mild steel corrosion in HCl solution by ciprofloxacin drug by weight loss method. 2. Experimental 2.1. Materials A commercially available grade of mild steel (purity = 98% Fe) identified and obtained locally was employed in this study. The sheets of metal were mechanically press cut into coupons of 3?cm × 3?cm × 0.1?cm dimensions. A small hole of about 5?mm diameter near the upper edge of the coupons was made to help hold them with grass hooks and suspend them into the corrosive medium. The coupons were used without further polishing. However, they were degreased in acetone, washed in doubly distilled water, and stored in moisture-free desiccators before use. The inhibitor used in this study was an antibiotic drug with common name: ciprofloxacin, while its systematic name is 1-cyclopropyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-quinoline-3-carboxylic acid. The molecular formula of the drug is C17H18FN3O3 with molecular mass of 331.346?g/moL. Ciprofloxacin has the
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.

Preliminary Geophysical Investigation to Delineate the Groundwater Conductive Zones in the Coastal Region of Akwa Ibom State, Southern Nigeria, around the Gulf of Guinea  [PDF]
George N. Jimmy, Akpan A. Otu, Umoh A. Asuquo
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.41011
Abstract:

This paper presents the first work of its kind within the confines of the study area. It unravels the distribution of the layers of conductive sand and their depths of interaction between freshwater from fresh sands and saltwater within the conductive layers in the coastal region of Akwa Ibom State (Nigeria) around the Gulf of Guinea. Vertical electrical sounding (VES) data whose fidelity was achieved by constraining the data by the available nearby logged borehole information during interpretation was the method applied. In the western region of the study area, the ferruginized and saline water layer is found within the depth range of 22 to 75 m deep. In the northern zone, conductive sandy layer is found within 50 to 210 m and in the eastern zone, the saline and ferruginized sandy layer is found within the depth of 88.5 m and above. Generally, the horizontal and vertical cross sections of the subsoil and the flow regime from water table depths have been delineated. With these information, water can be tapped in the area with caution and the flow direction determined can be used as input parameter in detailed contamination study.

Physicochemical Characteristics, Degradation Rate and Vulnerability Potential of Obudu Cattle Ranch Soils in Southeast Nigeria  [PDF]
A. U. Akpan-Idiok, K. I. Ofem
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.42008
Abstract:

Obudu Cattle Ranch covers an area of 2400 hactares at an altitude of 900 - 1500 m above mean sea level and is suitable for cultivation of cucumber (Cucumis sativus), tomato (Solanum lycopersicum), Irish potato (Solanum tuberosum), spinach (Spinacia oleracea) cabbage (Brassica oleracea), lettuce (Lactuca sativa) because of its semitemperate climate. Physicochemical characteristics, degradation rates and vulnerability potential of the soils were studied. Eighteen composite soil samples (0 - 15 and 15 - 30 cm) were collected at interval of 500 m along North-South and East-West transects in nine locations. The soils were characterized as follows: texture of sandy loam for the surface and subsurface soils; pH(H2O) (4.7 - 5.7), organic carbon (4.9 - 74.8 gkg-1), total nitrogen (0.2 - 4.8 gkg-1), carbon-nitrogen ratio (14 - 25), available P (6.66 - 107.89 mgkg-1), effective cation exchange capacity (ECEC) (5.58 - 14.62 cmol·kg-1) and base saturation (49.37% - 85.28%); the surface soils were generally higher in organic carbon, total nitrogen, available P and ECEC than the subsurface. The Soil Degradation Rate (SDR)/ Vulnerability Potential (Vp) weighted values of texture (3/3), soil pH(H2O) (4/2), organic carbon (1/5) and base saturation (2/4) showed moderate to low susceptibility of the soils to degradation or vulnerability. The soils could be managed by liming, practicing crop rotation and using soil conservative measures.

Can a Good Performance Management Technique Improve Public Health Outcome? A Rapid Assessment of Public Health Organization in Nigeria  [PDF]
David Akpan
Journal of Human Resource and Sustainability Studies (JHRSS) , 2019, DOI: 10.4236/jhrss.2019.72009
Abstract: Performance management practice dates back as one of the critical parts of the human resource management process of any organization which is expected to help the organization make policy level decisions, and program direction and improve to organizational learning. A few organizations have made an attempt to institute a performance management system to assist with assessing work productivity, with findings not used to compare with agreed goal of the organization. Relatively, if the focus of the organization is to deliver public health outcomes, how is performance management a significant step to help the organization shapes its workforce productivity towards achieving on its public health outcomes? What system is in place to enable the performance management process to have a direct impact on public health outcome? This work intends to determine the capacity of public health organizations performance management system in driving work productivity leading to achievement of established public health outcome. A quantitative assessment was conducted using a Performance Management Self-Assessment Tool (PMSAT) developed by Turning Point Performance Management National Excellence Collaborative in 2004 and data collected were analyzed using a statistical tool. The results of the findings revealed a high-level commitment from the leadership, alignment of performance priority areas to the Agency’s mission and the ability of the performance system to measure key areas like health status of personnel, human resource development, financial systems and management practices. However, the current system lacks the capacity to develop its Information and Data System to provide timely reports on performance outcome as well as providing feedback for program and management decision and relationship with clients and stakeholders. In conclusion, it is important to mention that performance management is more than just a process for rewarding employee’s productivity but a tool that helps organizations measure their overall performance based on its employee’s efforts.
Comparative Analysis of Administrative Competencies of Male and Female Secondary School Principals in Supervision
A A Akpan, E B Usoro
African Research Review , 2008,
Abstract: The study aimed at comparing male and female secondary school principals\' administrative competencies in supervision. The sample was made up of 60 male and 60 female principals totaling 120 randomly selected from 10 existing educational zones in Akwa Ibom State, Nigeria. Two hypotheses formed the basis of the study. One tested at 0.05 level of significance using t- test, while the other was tested using analysis of covariance and multiple classification analysis. The results showed that male principals were not significantly better in supervision than their female counterparts. Teaching experience had no significant influence on principals\' supervision competencies but administrative experience has great influence on their supervision competencies. African Research Review Vol. 2 (2) 2008 pp. 82-93
Solutions of Schrödinger Equation with Generalized Inverted Hyperbolic Potential  [PDF]
Akpan N. Ikot, Eno J. Ibanga, Oladunjoye A. Awoga, Louis E. Akpabio, Akaninyene D. Antia
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312232
Abstract: The bound state solutions of the Schr?dinger equation with generalized inverted hyperbolic potential using the Nikiforov-Uvarov method are reported. We obtain the energy spectrum and the wave functions with this potential for arbitrary l-state. It is shown that the results of this potential reduced to the standard potentials—Rosen-Morse, Poschl-Teller and Scarf potential as special cases. We also discussed the energy equation and the wave function for these special cases.
Review of Green Polymer Nanocomposites  [PDF]
Samson O. Adeosun, G. I. Lawal, Sambo A. Balogun, Emmanuel I. Akpan
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.114028
Abstract: Recently, attention has been drawn to the use of bio-reinforced composites in automotive, construction, packaging and medical applications due to increased concern for environmental sustainability. Green polymer nanocomposites show unique properties of combining the advantages of natural fillers and organic polymers. Plant fibers are found suitable to reinforce polymers. They have relatively high strength and stiffness, low cost of acquisition, low density and produce low CO2 emission. They are also biodegradable and are annually renewable compared to other fibrous materials. Organic polymers on the other hand, are desirable because they are either recyclable or biodegradable without causing environmental hazards. This paper reviews current research efforts, techniques of production, trends, challenges and prospects in the field of green nanocomposites.
Anal Cancer in a HIV Sero-Positive Bisexual Bachelor—A Case Report and Literature Review  [PDF]
Victor Nwagbara, M. E. Asuquo, J. A. Ashindoitiang, S. O. Akpan
Case Reports in Clinical Medicine (CRCM) , 2018, DOI: 10.4236/crcm.2018.712055
Abstract: Anal cancer, especially squamous cell carcinoma (SCC) variety, is evolving with rising incidence globally. This is due to the increasing adoption of risky life styles and social habits even in populations with rare occurrences previously. This case report aims to expose risk factors exhibited by a patient recently managed for anal cancer in our facility before his demise. Early exposure to bisexual orientation, receptive anal intercourse and multiple sexual partners, are notable high risk factors for the development of anal SCC. The permissive role of smoking, illicit drug and alcohol use enhances the disease occurrence. Acquisition of human immune-deficiency virus (HIV) sero-positive status further reduces the body’s immune competence and enhances early age of onset as well as accelerates development of anal SCC. Proper history exploring the risk factors, physical/anorectal examination and histological analysis, are vital for proper diagnosis and staging which guides appropriate treatment with chemo-radiation as mainstay.
Accessibility levels to potable Water Supply in Rural Areas of Akwa Ibom State, Nigeria
P.A Akpan, J Aster
Ethiopian Journal of Environmental Studies and Management , 2010,
Abstract: The UN in the year 2000 enlisted improved access to potable water supply as one of the development goals to be achieved by 2015 in developing countries including Nigeria. This study therefore, examined the levels of access to potable water supply in rural areas of Akwa Ibom State against the background of meeting the Millennium Development Goals (MDGs) in 2015. to carry out the investigation, the map of the study area was divided into 500 grid squares (quadrates) and a total of 50 rural communities were sampled using table of random numbers. Community heads or their spokesmen/women in the sampled areas were target respondents and data on major sources of water supply, distance to the nearest major source of water supply and the number of water boreholes in the communities were collected and analyzed. The population of the communities provided a basis for evolving an index that measured the levels of access to potable water supply in the study area. The use of GIS was subsequently employed to map out the study area on the basis of levels of access to potable water supply. The overall result depicts a very poor status scenario as majority of the communities studied have deteriorating conditions. The study recommends among others that a state of emergency be declared in the water sector, if the MDGs are to be achieved in the water sector by 2015.
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