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22 articles for “Umar A. Umar”
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Research ArticleOpen accessIn the author namesA SURVEY: PARTICLE SWARM OPTIMIZATION-BASED ALGORITHMS FOR GRID COMPUTING SCHEDULING SYSTEMSFaruku Umar Ambursa, Rohaya LatipBio-inspired heuristics have been promising in solving complex scheduling optimization problems. Several researches have been conducted to tackle the problems of task scheduling for the heterogeneous and dynamic grid systems using different bio-inspired mechanisms such as Genetic Algorithm (GA), Ant Colony Optimization (ACO), Particle Swarm Optimization (PSO). PSO has been proven to have a relatively more promissing performance in dealing … …Journal of Computer Science, Vol. 9, Issue 12 · 25 Nov 2013 · 6,662 accessesView PDFCite
Research ArticleOpen accessIn the author namesImproving Client Internal Capability to Monitor Public-Private Partnerships Projects: A ReviewNoor Amila Wan Abdullah Zawawi, Arazi Idrus, Abdullahi Ahmed Umar, Mohd Faris KhamidiPublic-Private Partnerships (PPP) or Private Finance Initiatives (PFI) are increasingly becoming very popular with governments across the globe for the provision of public infrastructure and services. When contracted, the public sector client believing the private sector will act in accordance with ‘bounded rationality’, ignores the constant monitoring and review process which is an integral part of any project. However, the … …American Journal of Engineering and Applied Sciences, Vol. 5, Issue 4 · 12 Feb 2013 · 7,893 accessesView PDFCite
Research ArticleOpen accessIn the author namesInfluence of Oil Contamination on Geotechnical Properties of Basaltic Residual SoilZulfahmi Ali Rahman, Umar Hamzah, Mohd. Raihan Taha et al.Problem statement: Oil contamination due to accidental spillage or leakage brings hefty damage to the environments. It percolates steadily into subsurface environments and contaminates the soil and water system. Hydrocarbon contamination has not just affected the quality of the soil but will also alter the physical properties of oil-contaminated soil. Approach: This study presented the geotechnical properties of oil-contaminated soils … …American Journal of Applied Sciences, Vol. 7, Issue 7 · 31 Jul 2010 · 10,271 accessesView PDFCite
Research ArticleOpen accessIn the author namesWellbore Surveying While Drilling Based on Kalman FilteringMahmoud ElGizawy, Aboelmagd Noureldin, Jacques Georgy et al.Problem statement: Oil and gas are global fuels obtained primarily from drilling wells in underground terrestrial reservoirs. Vertical drilling is preferred because of its simplicity and therefore low cost, but subsurface targets can often be procured only by directing the wellbore along predefined non-vertical trajectories. For instance, directional drilling must be employed to reach locations inaccessible to the drilling rig, … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 2 · 30 Jun 2010 · 8,584 accessesView PDFCite
Research ArticleOpen accessIn the author namesReport on Mammalian Fossils of Chinji Formation, Dhulian, PakistanMuhammad Akbar Khan, Abdul Ghaffar, Zulfiqar Ali et al.Twenty mammalian fossil specimens of varying preservational state are described from the Chinji Formation of Dhulian, Pakistan. The remains described in this study are all teeth and represent the Proboscidea, Perissodactyla and Artiodactyla. All the dental specimens are new variants recorded here for the first time. Pliotriplopus dhulianensis is new to science having small size and absence of crista than … …American Journal of Applied Sciences, Vol. 2, Issue 12 · 31 Dec 2005 · 7,278 accessesView PDFCite
Research ArticleOpen accessIn the author namesCytotoxicity Evaluation of Curcumin-FITC Conjugates in Granulosa Cells Isolated from Ovarian Follicles of Kampung Chicken (Gallus gallus domesticus)Sukarman Hadi Jaya Putra, Mansur S, UmarudinLinking curcumin to fluorescein isothiocyanate (FITC) results in a hybrid fluorescent marker (curcumin-FITC) that exhibits improved stability and sensitivity in detection. This study sought to evaluate the biological safety and cytotoxic effects of curcumin-FITC on granulosa cells obtained from ovarian follicles (2-5 mm, F1-F4 stage) of Kampung chickens. Following fluorescent labeling with different concentrations of curcumin-FITC (0-100 μg/mL), cell viability … …OnLine Journal of Biological Sciences, Vol. 26, Issue 2 · 14 May 2026 · 1,503 accessesView PDFCite
Research ArticleOpen accessIn the author namesOn the Design and Construction of a Dual Axis Solar Tracker Prototype for a Dish Concentrator using ATMega3298P MicrocontrollerAlbright Abu Edet, Samaila Umaru, Isah IbrahimThe desire for reliable power supply is the reason for further research into alternative sources of power. Although solar tracking is not a new technology, yet solar harvesters still suffer low efficiency due to the intermittence of solar insolation. Thus many smart systems have been designed to maximise solar harvesters. Among the systems is the dual axis solar tracking system. … …Journal of Mechatronics and Robotics, Vol. 5, Issue 1 · 21 Apr 2021 · 7,253 accessesView PDFCite
Research ArticleOpen accessIn the author namesIsolation and Characterization of Chemical Constituents, Cytotoxicity, Antibacterial and Antioxidant Activity of the Compounds from Leptadenia hastata Roots Extract ByIsaac John Umaru, Hauwa A. UmaruThe aim of this work was to extract, isolate and characterise the chemical constituent from Leptadenia hastata roots. Fresh roots were washed and dried and was subjected to sequential maceration in polar and non-polar solvents. And introduced into rotary evaporator to concentrate the extract. Isolated compound was subjected to Thin Layer Chromatography and spectral analysis such as column and UV-Visible … …American Journal of Biochemistry and Biotechnology, Vol. 15, Issue 4 · 24 Dec 2019 · 7,961 accessesView PDFCite
Research ArticleOpen accessIn the author namesWNBLI - A Multifarious Liability Examination for Wireless Sensor NetworksTamilarasi B., UmaRani R.Wireless communications has completely revolutionized the living environment, just as personal computers forever altered the way of working in the 1980’s and the Internet dramatically changed the obtainment and accessing way of information in the 1990’s. Wireless sensor networks are evolving to a new level. The Failure liability is a very prominent problem in Wireless Sensor Network (WSN) research. Failure … …Journal of Computer Science, Vol. 14, Issue 6 · 8 May 2018 · 7,578 accessesView PDFCite
Research ArticleOpen accessIn the author namesAntifungal Potential of Leptadenia Hastata Against Some Pathogenic FungiIsaac John Umaru, Fasihuddin A. Badruddin, Henry Y. Wakawa et al.The objective of this study was to evaluate if the plant extract could provide antifungal potential against some pathogenic fungi. Extract of Dichloromethane solvents was used for disc diffusion assay. The inhibitory concentration of the extract was performed by broth dilution method and zone of inhibition was studied by disc diffusion method at the concentration of 25, 50, 100, 250, … …American Journal of Biochemistry and Biotechnology, Vol. 14, Issue 1 · 9 Mar 2018 · 10,161 accessesView PDFCite