oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 133 )

2018 ( 158 )

2017 ( 145 )

2016 ( 187 )

Custom range...

Search Results: 1 - 10 of 87835 matches for " I Akpan "
All listed articles are free for downloading (OA Articles)
Page 1 /87835
Display every page Item
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.

Effective Safety and Health Management Policy for Improved Performance of Organizations in Africa
Emmanuel I. Akpan
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n3p159
Abstract: Improving performance in organization may be demonstrated by way of intensifying effort towards increasing output level and quality. To accomplish this goal means efforts of employees are required in task performance. Effective execution of such essential employee responsibility, to a great extent, depends on the level of safety in the workplace. Management policy, especially in the developing economies is yet to properly address the issue of employee health and safety. This has resulted in frequent accidents and hazards, leading to high costs in the areas of hospital bills, salaries for hospitalized workers and compensations. Increased labor turnover, absenteeism, strained management-labor relationships, operational inefficiency, and ultimately decreasing performance become noticeable in such organizations. To satisfy workers’ safety needs and motivate them, ceteris paribus, management must maintain effective health and safety program, and be committed to its success in all ramifications.
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.

Non-caseating submental tuberculous lymphadenopathy: A case report  [PDF]
M. E. Asuquo, V. I. Nwagbara, S. Akpan, G. Ebughe, T. Ugbem, I. M. Asuquo
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.25078
Abstract: Chronic peripheral lymphadenopathy in adults is an indication of pathology of which tuberculosis is the commonest in the developing countries. Presented is a 36-year-old with a huge chronic Submental lymphadenopathy in a seronegative patient of 7 years duration. Histology revealed non-caseating tuberculosis. Tuberculosis should be considered in Submental lymphadenopathy. Despite the long duration, the absence of cold abscess, and or sinus formation may be an indication of the non-caseating tuberculous lymphadenopathy.
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.
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.
Palm kernel agar: An alternative culture medium for rapid detection of aflatoxins in agricultural commodities
OO Atanda, I Akpan, OA Enikuomehin
African Journal of Biotechnology , 2006,
Abstract: The feasibility of using palm kernel agar (PKA) as an alternative culture medium to desiccated coconut agar (DCA), the conventional medium for the recovery of aflatoxigenic fungi from mixed cultures and the detection of aflatoxigenic fungi and direct visual determination of aflatoxins in agricultural commodities was assessed. The medium recovered aflatoxigenic fungi in 48 h from mixed cultures and agricultural commodities in 58 h as compared to 62 h obtained for the two treatments on desiccated coconut medium. Aflatoxigenic fungi were detected in all the agricultural commodities except for onions with maize having the highest value of 13.18% (w/w) followed by melon (10.97), yam flour (10.23) and groundnut (8.52) as against 11.48, 10.0, 6.92 and 8.52% (w/w) obtained for DCA. All aflatoxigenic strains produced a characteristic yellow pigmentation on a pink background and blue or blue green fluorescence of palm kernel agar Under long wave UV light (366nm) as against the white background of DCA, which often interferes with fluorescence with corresponding yield of aflatoxins. This shows that the medium is able to efficiently detect aflatoxin production through direct visual observation of fluorescence. Palm kernel agar (PKA) can therefore be routinely used as an alternative culture medium for screening aflatoxigenic fungi and direct visual determination of aflatoxins in agricultural commodities since it is faster and has a unique pink background for easy identification
Effect of Heat and Tetracycline Treatments on the Food Quality and Acridity Factors in Cocoyam [Xanthosoma sagittifolium (L) Schott]
Enomfon J. Akpan,I.B. Umoh
Pakistan Journal of Nutrition , 2004,
Abstract: The effects of heat and drug (Tetracycline) treatments on the food quality of cocoyam-tannia [Xanthosoma sagittifolium (L) Schott] were studied. The proximate composition, mineral elements and anti nutritional factors of cocoyam were determined before and after various treatments. Moisture content decreased from 69.8% in the uncooked sample (C1) to 67.62% in C2 cooked without drug. The decreases became more significant in various cooked samples C2 to C6 with different concentrations of tetracycline. Protein, fat, ash and fibre contents of the raw cocoyam (% dry weight) were 2.83, 0.93, 1.74 and 0.88 respectively. The protein, fat, ash and fibre contents decreased to 1.48, 0.72, 1.70 and 0.76 in the sample cooked without drug (C2). Significant decreases were observed when samples C3-C6 were cooked with 1g (1000mg) of Tetracycline as the values decreased to 1.13, 0.48, 1.33 and 0.57 (% dry wt) respectively. Mineral elements analysis showed general decreases in the cooked samples. There was a 17% reduction in calcium between C1 and C6 and similar trend was observed for other mineral elements. A general reduction in the level of anti nutrients was observed after heat and drug treatments. There was an improvement in food quality with respect to the anti nutrients but with decreased values of the desired nutrients. However, there was also a general reduction in the undesirable properties of the cocoyam such as the acridity factors caused by crystal of oxalate when the corms of cocoyam were cooked with and without Tetracycline.
Quantum Damped Mechanical Oscillator
Akpan N. Ikot,Louis E. Akpabio,Ita O. Akpan,Michael I. Umo,Eno E. Ituen
International Journal of Optics , 2010, DOI: 10.1155/2010/275910
Abstract: The exact solutions of the Schr?dinger equation for quantum damped oscillator with modified Caldirola-Kanai Hamiltonian are evaluated. We also investigate the cases of under-, over-, and critical damping. 1. Introduction Quantum theory has been shown to be the fundamental law of nature and presently is the most correct theory of all microscopic and macroscopic systems [1–3]. Quantum effects usually manifested themselves at the microscopic level. The quantum theory is, however, governed by the Schr?dinger equation whereas classical theory is governed by the Hamilton equation, for instance [3]. Dissipation is usually ascribed as having a microscopic nature. There have been attempts to understand dissipation at a more fundamental level [1–26]. The simplest model for dissipation is damped oscillators with one or two degrees of freedom. In the canonical approach, two different Hamiltonian representations have been introduced for these damped oscillators. One representation of the damped system is the Caldirola-kanai (CK) oscillator which is a one-dimensional system with an exponentially increasing mass [1–3, 18–20, 23–26]. Another representation is the Bateman-Feshbach-Tikochinsky (BFT) oscillator, which consists of a damped and an amplified oscillator [3, 23–26]. The CK, on one hand, is an open system whose parameters such as mass and frequency are all time dependent [1, 2],and, on the other hand, the BFT is a closed system whose total energy is conserved and the dissipated energy from the damped oscillator is transferred to amplified [3, 26]. Recently, Tarasov has evaluated the quantization and classical distribution for dissipative systems [27, 28]. The aim of this paper is to evaluate the damped harmonic mechanical oscillator. The damping is here considered in the form of Caldirola-Kanai Model [1, 2] and the recently developed model [4]. However, the problem of quantum oscillator with time-varying frequency had been solved [5–12]. The Hamiltonian of this model is usually quadratic in coordinates and momenta operators [4–7]. Our primary goals will be to construct the Lagrangian for this simple damped system and use the constructed Lagrangian to evaluate the equation of motion for the damped Harmonic oscillators and also evaluate the minimum uncertain relation for each damping regime. 2. Review of Bateman-Feshbach-Tikochinsky Oscillator In a genuine dissipative system, the energy of the damped subsystem of the system must be dissipated away and transferred to another subsystem. This invariably means that the damped oscillator is described by a
Fatty Acid Profile and Oil Yield in Six Different Varieties of Fresh and Dry Samples of Coconuts (Cocos nucifera)
E.J. Akpan,O.E. Etim,H.D. Akpan,I.F. Usoh
Pakistan Journal of Nutrition , 2006,
Abstract: The physical and chemical properties of the oil extracted from six (6) varieties of coconut fruits were determined. The oils were brownish, some yellowish when melted, and at times white when solidified. The oils had specific gravity ranging between 0.90 and 0.92. The yield of the oil (% contents) from the ether extract was also analyzed using soxhlet extraction technique. The results showed the oil contents of 88.54% in dry samples and 69.14% in fresh samples. Result of the findings showed a higher percentage of saturated fatty acid content across the entire samples (88.5 0.85% - 97.0 0.37%) in the dry samples, than the unsaturated fatty acid constituents (8.4 0.45% - 9.5 0.30%). The moisture content was higher in the fresh samples than the dry samples. These findings therefore suggest a high percentage oil yield in the dry samples. It is therefore advisable that the nuts be harvested dry if the oil is intended for commercial use.
Page 1 /87835
Display every page Item


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