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Search Results: 1 - 10 of 198056 matches for " Romanus N. Njong "
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Corrosion Inhibitory Studies of Novel Schiff Bases Derived from Hydralazine Hydrochloride on Mild Steel in Acidic Media  [PDF]
Romanus N. Njong, Bridget N. Ndosiri, Emmanuel N. Nfor, Offiong E. Offiong
Open Journal of Physical Chemistry (OJPC) , 2018, DOI: 10.4236/ojpc.2018.81002
Abstract: The inhibition performance of 1-hydralazinophthalazine (HPZ) (1), and synthesized1-(2-[(5-methylfuran-2-yl)methylene)] hydrazono) phthalazine (MFHPZ) (2), 1-(phthalazin-1(2H)-one) [(pyridin-2-yl) ethylidene] hydrazone (ACPHPZ) (3) and (2-acetylthiophene hydrazono) phthalazine (ACTHPZ) (4) has been investigated for mild steel in 1 M HCl. Compound 4 shows maximum inhibition efficiency of 93% at 5.0 × 10-3 M concentration. The evaluation of thermodynamics and activation parameters indicated spontaneous adsorption of the inhibitor molecules which takes place through chemisorption. The adsorption of 3 and 2 follows Langmuir adsorption isotherm and Temkin adsorption isotherm for 4 and 1. The inhibitor efficiency was of the order 4 > 3 > 1
A Novel Mixed Ligand Dinuclear Complex of Cobalt (II): Synthesis, Characterization and Magnetic Studies  [PDF]
Emmanuel N. Nfor, Luke L. Keenan, Justin Nenwa, Peter T. Ndifon, Romanus N. Njong, Christelle N. T. Dzesse, Offiong E. Offiong
Crystal Structure Theory and Applications (CSTA) , 2014, DOI: 10.4236/csta.2014.31003
Abstract:

A novel dinuclear complex [Co2(atr)3(mal)2(H2O)2]·4H2O(1) (atr = 4-amino-1,2,4-triazole and mal = malonic acid) containing mixed N and O-donor atoms has been prepared and structurally characterized. The structure is made up of the symmetrically 1, 2, 4-triazole bridged [Co2(atr)3(mal)2(H2O)2] moiety and four lattice water molecules. The single crystal X-ray analysis reveals that the complex has a distorted octahedral structure. Magnetic susceptibility measurements reveals that antiferromagnetic interactions exists between the high spin Co(II) ions within the dinuclear unit.

Nickel (II) and Iron (II) Complexes with Azole Derivatives: Synthesis, Crystal Structures and Antifungal Activities
Emmanuel N. Nfor,Peter F. Asobo,Justin Nenwa,Oswald N. Nfor,Julius N. Njapba,Romanus N. Njong,Offiong E. Offiong
International Journal of Inorganic Chemistry , 2013, DOI: 10.1155/2013/987574
Abstract: Two new complexes of nickel (II) with 4-amino-3, 5-bis(pyridyl)-1, 2, 4-triazole (abpt) and iron (II) with 2-(3-phenyl-1H-pyrazole-5-yl) pyridine (phpzpy) have been synthesized and characterized by elemental analysis and IR spectroscopy. The crystal structures of the complexes have been determined by single crystal X-ray diffraction techniques. In the nickel and iron complexes, the ligands are coordinated through nitrogen atoms in bidentate manner. The ligands and their respective complexes have been tested for their antifungal activity against Aspergillus niger, Aspergillus flavus, and Candida albicans. From the study, the complexes showed enhanced activities against the tested organisms compared to the ligands. 1. Introduction Aromatic nitrogen heterocycles represent an important class of compounds which can act as ligands towards metal ions [1]. Azoles belong to this class and are five-membered heterocyclic ligands containing two or more heteroatoms, one of which must be nitrogen. These compounds have been paid considerable attention due to their wide applicability in medicine [2–4]. Pyrazole and triazole derivatives are subject of many research studies due to their widespread potential biological activities such as antitumour [5, 6], anti-inflammatory [7], antipyretic [8], antivirial [9], antimicrobial [10, 11], anticonvulsant [12], antihistaminic [13], antidepressant [14, 15], insecticides, and fungicides. In coordination chemistry pyrazole-and triazole-derived ligands exhibit various coordination modes and have received considerable attention for the synthesis of transition metal complexes with various nuclearities [16]. Herein we report on the synthesis, structural determination, and antifungal activities of Ni(II) and Fe(II) complexes of abpt and phpzpy, respectively. The crystal structures of the complexes are described and compared with those of closely related structures. 2. Experimental 2.1. Materials and Physical Measurements Elemental analysis for carbon, hydrogen, and nitrogen was performed on a Thermo Flash EA-1112 Series CHNS-O Elemental Analyzer. The IR spectra were obtained from KBr pellets in the range 4000–400?cm?1 using a Perkin-Elmer Spectrum 100?FT-IR spectrometer. 2.2. Single Crystal X-Ray Diffraction Analysis and Structure Determination Suitable-single crystals of 1 and 2 were selected and mounted in air onto a loop. The data collection for 1 and 2 was carried out with a Bruker DUO APEX II CCD diffractometer at 173 ?K using an Oxford cryostream 700. Data reduction and cell refinement were performed using SAINT-Plus, [17–21] and
Fe KαLine in Hard X-ray Emitting Symbiotic Stars
Romanus Eze
Physics , 2013, DOI: 10.1093/mnras/stt1947
Abstract: The 6.4 keV iron emission line is typically created by irradiation of the neutral (or low ionized) iron by a hard X-ray source. Whereas the 6.7 and 7.0 keV emission lines are mainly produced by photoionization and collisional excitation in hot plasma, the 6.4 keV fluorescence line is typically a signature of either reflection from an accretion disk or absorption. We have surveyed the emission using a collection of Suzaku ob- servations of hard X-ray emitting symbiotic stars to better understand the geometry of these systems. We find that they do not seem to have a single geometry, and that while absorption-induced fluorescence leads to some emission in three of the hard X-ray emitting symbiotic stars (hSSs) in our study, CH Cyg, T CrB and RT Cru there are strong hints that significant 6.4 keV emission arises in the accretion disk irradiated by the hard X-rays from the boundary layer between the accretion disk and hot white dwarf in one of our sources, SS73 17. The 6.7 and 7.0 keV lines, however, are largely produced by collisional excitation in the vicinity of the compact white dwarf.
Deteriorating Environmental Resources and Primary School Educational Attainment in the Rural South Pare Highlands, Tanzania
Romanus Lucian Dimoso
International Journal of Education , 2012, DOI: 10.5296/ije.v4i1.1147
Abstract: We assess whether school attendance and progress of children in rural primary schools, with respect to their gender, is inversely affected by deteriorating environmental resources. We distinguished three types of areas, namely, severely-degraded, medium-degraded and non-degraded environmental conditions. Our findings, among others, show that there were other factors like school crowdedness, illness, bad weather, school absenteeism due to petty trading and/or informal casual labour, and poor quality of some primary schools that significantly affected the probability of school attainment for the schoolchildren apart from the environmental degradation situations. Environmental degradation, in all estimates except for the schoolgirls in severely-degraded environment, did not have a significant impact. The policy makers therefore, in their attempt to improve educational attainment and human capital formation at primary level should, as well, focus on these other relevant factors excluded from our model. Moreover, the non-government sector may also be enticed into investing in education through attractive fiscal incentives.
Online Social Networks and Terrorism 2.0 in Developing Countries
Fredrick Romanus Ishengoma
Computer Science , 2014,
Abstract: The advancement in technology has brought a new era in terrorism where Online Social Networks have become a major platform of communication with wide range of usage from message channeling to propaganda and recruitment of new followers in terrorist groups. Meanwhile, during the terrorist attacks people use social networks for information exchange, mobilizing and uniting and raising money for the victims. This paper critically analyses the specific usage of social networks in the times of terrorism attacks in developing countries.
Authentication System for Smart Homes Based on ARM7TDMI-S and IRIS-Fingerprint Recognition Technologies
Fredrick Romanus Ishengoma
Computer Science , 2014,
Abstract: With the rapid advancement in technology, smart homes have become applicable and so the need arise to solve the security challenges that are accompanied with its operation. Passwords and identity cards have been used as traditional authentication mechanisms in home environments, however, the rise of misuse of these mechanisms are proving them to be less reliable. For instance, ID cards can be misplaced, copied or counterfeited and being misused. Conversely, studies have shown that biometrics authentication systems particularly Iris Recognition Technology (IRT) and Fingerprint Recognition Technology (FRT) have the most reliable mechanisms to date providing tremendous accuracy and speed. As the technology becomes less expensive, application of IRT& FRT in smart-homes becomes more reliable and appropriate solution for security challenges. In this paper, we present our approach to design an authentication system for smart homes based on IRT, FRT and ARM7TDMI.The system employs two biometrics mechanisms for high reliability whereby initially, system users must enroll their fingerprints and eyes into the camera. Iris and fingerprint biometrics are scanned and the images are stored in the database. In the stage of authentication, FRT and IRT fingerprint scan and analyze points of the user's current input iris and fingerprint and match with the database contents. If one or more captured images do not match with the one in the database, then the system will not give authorization.
A Novel Design of IEEE 802.15.4 and Solar Based Autonomous Water Quality Monitoring Prototype using ECHERP
Fredrick Romanus Ishengoma
Computer Science , 2014,
Abstract: The recently advancement in Wireless Sensor Network (WSN) technology has brought new distributed sensing applications such as water quality monitoring. With sensing capabilities and using parameters like pH, conductivity and temperature, the quality of water can be known. This paper proposes a novel design based on IEEE 802.15.4 (Zig-Bee protocol) and solar energy called Autonomous Water Quality Monitoring Prototype (AWQMP). The prototype is designed to use ECHERP routing protocol and Adruino Mega 2560, an open-source electronic prototyping platform for data acquisition. AWQMP is expected to give real time data acquirement and to reduce the cost of manual water quality monitoring due to its autonomous characteristic. Moreover, the proposed prototype will help to study the behavior of aquatic animals in deployed water bodies.
Fiscal Policy, Labour Productivity Growth and Convergence between Agriculture and Manufacturing: Implications for Poverty Reduction in Cameroon
Tabi Atemnkeng Johannes,Aloysius Mom Njong
Asian Social Science , 2012, DOI: 10.5539/ass.v8n4p190
Abstract: This paper examines the factors that drive labour productivity convergence between agriculture and manufacturing activities in Cameroon over 1969-2005. It is supposed that whenever one sector grows in terms of labour productivity it will also bring benefit to other industries. For instance, agriculture plays a significant role in reducing poverty. The bulk of the poor are engaged in agriculture and so an increase in agricultural productivity has a significant potential for reducing such poverty. Our findings indicate that while government spending on education, health, and road infrastructures promotes convergence, agricultural spending reinforces inequality in sectoral labour productivity by disproportionately increasing non-agricultural sector productivity. Furthermore, increases in manufacturing and service productivity levels both have a positive impact on agricultural productivity in the long-run, with manufacturing equally contributing in the short-run.
Discriminant Analysis of Demand-Side Roadblocks to Financial Inclusion in Northern Ghana  [PDF]
Issahaku Yakubu, Romanus Dinye, Daniel Buor, Wahab A. Iddrisu
Journal of Mathematical Finance (JMF) , 2017, DOI: 10.4236/jmf.2017.73038
Abstract: Northern Ghana has been described as the most poverty-stricken spot in Ghana. Given the link between financial inclusion and poverty reduction, this paper aims at estimating a discriminant function model to analyse demand-side roadblocks to financial inclusion in Northern Ghana. The study is mainly based on primary data elicited through survey questionnaires. Even though the minimum sample size was determined to be 385 households, a total of 400 households were selected systematically, out of which 395 households returned their questionnaires for analysis. The estimated discriminant function model was found to be significant at the 1% level of significance. It was also found that, the demand-side roadblocks that are very crucial to financial inclusion in Northern Ghana (in order of importance) are “Culture”, “Cost”, “Capability”, and “Trust”. Overall, 77.2% of the cases were correctly classified by the estimated model. This paper therefore concludes that most vulnerable groups in Northern Ghana still find it difficult to access formal financial services due to barriers such as culture, cost, capability and trust. Government policies should therefore be directed at addressing these barriers so as to enhance financial inclusion in the area which eventually will lead to poverty reduction.
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