Papers by Abdulrahman Abdullahi
The inhibition efficacy of a novel green corrosion inhibitor based on Jatropha podagrica stem bar... more The inhibition efficacy of a novel green corrosion inhibitor based on Jatropha podagrica stem bark extract (JPSE) toward carbon steel (CS) corrosion in 0.5 M H2SO4 solution was explored by integrated experimental and computational studies. The inhibition behavior was probed using weight loss analysis, potentiodynamic polarization (PDP) test, electrochemical impedance spectroscopy (EIS) and surface analysis techniques. In addition, the adsorption process between JPSE compounds and iron atom was theoretically examined by using quantum chemical calculations and molecular dynamics (MD) simulations. The experimental results revealed that 600 mg L-1 JPSE protected the CS surface by ~87%. The polarization tests revealed that the JPSE acted as a mixed type inhibitor with dominant effect on the cathodic reactions restriction. The EIS analysis showed that the increase of JPSE concentration led to the significant increment of charge transfer resistance. Surface analysis via SEM clearly proved ...
This study was carried out to compare the digital rectal (DR) thermometer with non-contact infrar... more This study was carried out to compare the digital rectal (DR) thermometer with non-contact infrared thermometer (IRT) measurements at two locations on the face in some large animal species. Two hundred and forty (240) animals comprising of equal numbers of three species (cattle, camel and horses) of varying age and either sex was used. The IR temperature was taken from two sites [frontal (FIRT) and temporal (TIRT) region] on the animal face. The mean IR temperatures (FIRT and TIRT) were higher than the RT in all the animal species. The two thermometers correlate poorly in all the animal species. Bland-Altman analysis showed high biases and limits of agreement not acceptable for clinical purposes. In conclusion, IRT seems to offer a quick and easy way to determine the animal temperature but clinically it cannot be used interchangeably with DR thermometer at the moment for body temperature measurement in these animal species.
The focus of this work is to establish the inherent features of the serial genres in television t... more The focus of this work is to establish the inherent features of the serial genres in television that emerged from literature and discuss their importance and impact on the spectatorship. The rise and development of the serial genres will be discussed along with the growing influence on the society and individuals. How much do the genres of telenovelas and series differ in the context of cultural nuances and what is the genesis of the human urgency in retelling the melodramatic and tragic narratives? Enormous popularity deriving from these stories is reflected in the prime time broadcasting by Croatian, Serbian and Bosnian TV stations since 2002. The essay will explain the ontogenesis of the popularity, reflections and influences on societies and cultures, and features of this hybrid and changing genre of telenovelas and the most recent infatuation with Turkish serials in the TV region of West Balkans.
This study concerns the flame dynamics of a curved-wall jet (CWJ) stabilized turbulent premixed f... more This study concerns the flame dynamics of a curved-wall jet (CWJ) stabilized turbulent premixed flame as it approaches blow-off conditions. Time resolved OH planar laser-induced fluorescence (PLIF) delineated reaction zone contours and simultaneously stereoscopic particle image velocimetry (SPIV) quantified the turbulent flow field features. Ethylene/air flames were stabilized in CWJ burner to determine the sequence of events leading to blowoff. For stably burning flames far from blowoff, flames are characterized with a recirculation zone (RZ) upstream for flame stabilization followed by an intense turbulent interaction jet (IJ) and merged-jet regions downstream; the flame front counterparts the shear layer vortices. Near blowoff, as the velocity of reactants increases, high local stretch rates exceed the extinction stretch rates instantaneously resulting in localized flame extinction along the IJ region. As Reynolds number (Re) increases, flames become shorter and are entrained by ...
Structural Materials eJournal, 2020
Experimental study on the Effect of pulverized glass powder (PGP) on the compressive strength of ... more Experimental study on the Effect of pulverized glass powder (PGP) on the compressive strength of revibrated concrete is presented. A concrete mix of 1:2:4 was used to prepare a total of forty-eight fresh concrete cubes specimen: sixteen for control with 0% PGP; thirty-two cubes for the different percentages of OPC replacements (10%, 20%, 30% and 40% PGP). Each set of fresh concrete cubes were subjected to initial vibration and then re-vibrated at an interval of 10 minutes successions up till 1 hour. The compressive strength was determined at 7 and 28days curing age for each concrete cube. The results show that maximum compressive strength were best achieved in three categories: 21.39 N/mm2 for nonrevibrated; 23.64 N/mm2 and 18.34N/mm2 for 0% and 20% PGP revibrated concrete respectively. It is concluded that pulverized glass can be blended with cement up to 20% PGP to achieve a substantial compressive strength of revibrated concrete.
International Journal of Industrial and Manufacturing Systems Engineering, 2017
Advancement in development of Information and Communication Technology engendered by the inventio... more Advancement in development of Information and Communication Technology engendered by the invention of agent technologies have fundamentally altered the ways the environment is secured. The advent of Intelligent Multi Agent technologies has also brought changes to various human activities, notably in respect of security. A multi-agent system (MAS) is a system composed of multiple interacting intelligent agents. Multi-agent systems can be used to solve problems which are difficult or impossible for an individual agent or monolithic system to solve like effective and continuous monitoring of the environment. It is observed that most institutions such as polytechnics and universities campuses are in critical positions with respect to securing of capital assets (i.e. detecting any problem through monitoring: temperature, motion, etc). Sensor networks are among the most important tools for performing such tasks. In this research work, multi agent technologies system was used to secure and/or monitor the buildings and rooms of a Polytechnic campus. The system is based on Intelligent multi agents and Wireless LAN connected sensors using JADE (Java Agent Development Environment), Netbeans and Java Development Kit (JDK).
Irrigation and Drainage, 2020
Distribution and availability of global resources is highly variable over time and heterogeneous ... more Distribution and availability of global resources is highly variable over time and heterogeneous in space. With the natural or conventional supply of these resources no longer meeting a growing demand, the need to promote resource efficiency is now being paralleled with innovative approaches to conserve resources within their use cycle. These ‘innovative approaches’ herewith referred to as non-conventional was the subject of a 10-weeks extensive discussion among Young Professionals (YPs) in the field of irrigation and drainage. The discussion aligns to a higher objective of breeding a generation of YPs with an open mindset and multi-disciplinary approach to the challenges in irrigation and drainage. Cutting across development corridors in the water sector, this review paper presents insights on non-conventional sources of agricultural water management (AWM) as viewed from the lenses of YPs. The discussions underscore the need for broad-based approaches to resource management, building on the premise that all forms of resources are linked to form a system that provides the most effective service when managed in an integrated fashion. Non-conventional requires divergent approaches and flexibility; underlining the invaluable capabilities YPs present in AWM. Besides highlighting these roles, insights provided by YPs suggests that feeding a growing population necessitates looking beyond system efficiency to multivariate approaches of resource optimisation and utilisation in the field of irrigation and drainage.
Energy & Fuels, 2017
Laminar burning velocities of FACE-C gasoline and a surrogate comprised of toluene primary refere... more Laminar burning velocities of FACE-C gasoline and a surrogate comprised of toluene primary reference fuels (TPRFs) were investigated under the effects of EGR dilution and ethanol blending. Measurements were conducted in a spherical constant volume combustion chamber for a range of equivalence ratios from 0.8 to 1.6 at initial temperatures and pressures up to 383 K and 0.6 MPa, respectively. These measurements highlighted the effects of real combustion residuals (using combustion products directly) at mole fractions up to 0.3 and various volumetric percentages of ethanol blending. For both studied fuels, significant reductions in stretched and un-stretched flame speeds were observed for mixtures laden with real combustion residuals. Blends with less than 50% ethanol showed barely a minimal enhancement in the flame speed. By combining both EGR and ethanol blending, the flame speed reduction by EGR can be compensated for with ethanol addition. For example, up to 10% of EGR requires 60% ethanol blending to maintain the same flame speed. Flame stability enhancement by EGR addition was also quantified through the determination of the Markstein length.
International Journal of Information and Communication Sciences, 2017
Home automation involves introducing a degree of automatic control to certain electrical and elec... more Home automation involves introducing a degree of automatic control to certain electrical and electronic systems in a building such as lighting, temperature control etc. This work presents the design, specification, and prototype implementation of a composite home automation system using Bluetooth/Wi-Fi over android platform. The research work provides multiple yet simple design approaches for developing flexible and robust home automation system to cater for the deficiency in overall control of user appliances. It also tackles the problems with complex, multiple, incompatible standards and the resulting expenses in the existing systems. The proposed system features an Arduino Mega board with core AVR microcontroller (ATmega2560) interfaced to the ubiquitous ESP8266 Wi-Fi chip, Infrared transmitter and receiver mechanism, power relay interface as well as user contact LCD and Keypad. With the HTML5 based intuitive mobile and web applications, unlimited flexibility is induced in the system operations and management. Overall, the system extends the capabilities of home automation beyond the basic appliances switching and monitoring by giving broad control over the appliances' functionalities in addition to switching their power.
The Korean Journal of Parasitology, 1993
Monoclonal antibodies (mAb) against merozoites and sporozoites of the protozoan parasite Cryptosp... more Monoclonal antibodies (mAb) against merozoites and sporozoites of the protozoan parasite Cryptosporidium parvum were examined for potential modulation of cryptosporidial infections in vivo by daily oral mAb administration to oocyst-inoculated neonatal mice. Monoclonal-treated neonatal mice were sacrificed four and eight days post infection (pi). Differences in infection rates were observed among the treatment groups at the p < 0.05 level. Suckling mice treated daily with orally administered mixtures of mAbs (ascitic fluids) showed significantly reduced parasite loads compared to control mice at four and eight days pi, while suckling mice receiving mAb Cmg-3 alone showed significant differences only at 4 days pi., suggesting that passive transfer of mAb may be of value in controlling cryptosporidial infections.
Combustion Science and Technology, 2016
ABSTRACT
International Journal of Information and Network Security (IJINS), 2013
This paper studies the performance of different network devices in an Ethernet based network envi... more This paper studies the performance of different network devices in an Ethernet based network environment. That is the performance of Hub, Switch and Bridge in local area networks (LANs) in order to know which among these three networks devices mentioned above performs best in terms of packet transfer, collision count and delay. The simulation was carried out using OPNET IT Guru Academic Edition 9.1. To observe the performance of these devices, three scenarios were presented. In the first scenario, the network was connected with one hub and 16 nodes; the second scenario was connected with two hubs and a switch while the third scenario was connected with two hubs and a bridge. These entire scenarios were observed under different Packet sizes 1500 bytes, 1024 bytes and 512 bytes. But it was observed that the higher the packet size the higher the value of some of the performance metrics such as traffic received and delay on the other hand some performance such as collision count was improving as the packet size reduces from 1500 bytes, 1024 bytes e.t.c. but in some situation the packet size has no significant impact on some performance metric such as traffic sent. The simulation results displayed the level of data traffic observed in the three scenarios
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Papers by Abdulrahman Abdullahi