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Search Results: 1 - 10 of 401410 matches for " M Mukhtar "
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Removal of chromium ion from leather industrial wastes by activated pure rice hulls
M Mukhtar
African Journal of Biotechnology , 2009,
Abstract: The removal of Cr ions from industrial wastage by adsorption on rice hulls was investigated based on activated pure rice hulls dosage, stay time, metal concentration and solution temperature. The optimum values of activated pure rice hulls dosage and stay time were determined to be 0.5 gm/50 ml solution and 60 min, respectively, for the adsorption of Cr ions. The constant for the Freundlich, D-R and Langmuir isotherms were calculated at (293 – 323 K). The adsorption of Cr from industrial wastage was found to be exothermic. Thermodynamic parameters such as free energy (G°), enthalpy (H°) and entropy (S°) of adsorption was also calculated and interpreted from the slope and intercept of the plots of In KD vs I/T. The G° value decreases with rise in temperature and the negative values of H° indicate that the adsorption of Cr from industrial wastage was an exothermic process while positive values of change in entropy (S°) were also observed.
Vulnerability Analysis of Wide Area Measurement System in the Smart Grid  [PDF]
Mohd Rihan, Mukhtar Ahmad, M. Salim Beg
Smart Grid and Renewable Energy (SGRE) , 2013, DOI: 10.4236/sgre.2013.46A001
Abstract:

The smart grid will be a power grid more “aware” of its operating state and having the ability to self-heal. These features may be incorporated into the grid by implementing a phasor measurement units based wide area measurement system. Such a system will help in better real time monitoring and control of the grid. However, the wide area measurement system is subject to challenges with respect to its security. In this paper, a comprehensive analysis of security issues with a wide area measurement system is presented and the research efforts required to be taken are identified. Moreover, the effect of communication failure on a PMU installed system has been presented using integer linear programming.

Determination of levels of fluoride and trace metal ions in drinking waters and remedial measures to purify water
M Mukhtar, H Tahir
African Journal of Biotechnology , 2007,
Abstract: Fluoride is recognized to be most effective caries-preventive agent. The main source of fluoride for people is generally food and drinking water. For this reason, fluoride and other metal ion concentrations in the drinking water samples were estimated. For the determination of fluoride, Na, Li and K an ion – meter and flame photometer were used. While the concentrations of other metal ions (Mn, Cd, Co, Ni, Pb, Fe, Zn and Cu) were estimated by flame atomic absorption spectrophotometer. Statistical parameters and multiple correlations between paired water samples were also calculated. For the purification of water, adsorption technique was adopted using Al2O3 and Al2O3 -Pb 0.1, Al2O3 – Pb 0. 01 doping systems. Adsorption isotherm equations were also applied to calculate the values of respective constants. Thermodynamic parameters (DGo, DHo and DSo) were also calculated. According to the results obtained, the metal ion concentration in the drinking waters in the studied area are within the safe drinking water regulation limits and also the fluoride level is lower then the permissible limit for flouride.
Physiological Responses of Some Drought Resistant Cowpea Genotypes (Vigna unguiculata (L.) Walp) to Water Stress
M Hayatu, FB Mukhtar
Bayero Journal of Pure and Applied Sciences , 2010,
Abstract: Drought is an abiotic stress that affects the growth of cowpea genotypes in Sub-saharan Africa One of the first physiological responses to water stress in crops is the functioning of the leaf. The aim of the present study is to determine leaf physiological responses of cowpea to water stress. The study was conducted at International Institute of Agriculture (IITA) Kano state, Nigeria during the period of 17th November to 23rd December 2009. Seven cowpea genotypes differing in drought resistance were evaluated. The experiment was laid out in randomized complete design with three treatment regime, which include unstressed (control), moderate and severe water stress condition. The criteria measured include, Chlorophyll fluorescence parameters, chlorophyll content (SPAD), Water Use Efficiency (WUE) specific leaf area (SLA), shoot and root biomass. The results showed that water stress significantly reduced chlorophyll content (SPAD). 100% reduction was recorded in moderate and severe water stress. The results of photochemical yield (Fv/Fm) indicated that 71% of the genotypes at severe stress had reduction in Fv/Fm, while 42% was recorded in moderate stress. Genotype IT98K-555-1 recorded the highest reduction in Fv/Fm. The result showed a positive correlation between photochemical yield and chlorophyll content (SPAD) at unstressed (r= 0.921), moderate (r=0.903) and severe (r= 0.861) at 5%. Water stress significantly reduced above ground biomass. Lower biomass was recorded more under severe water stress. Reductions in shoot biomass were more significant in IT0K-835-45 and IT98K-555-1. At severe water stress, most of the genotypes recorded lower water use efficiency, except in genotype IT00K-901-5. The results showed a general increase in root biomass in moderate and severe water stress condition, except in IT00K-835-45 and IT96D-610. Increases in the root biomass were recorded more under moderate stress.
Electrosurgery As A Bloodless Curative Treatment For Large Labial Mucocele
Mukhtar M D
Indian Journal of Dermatology , 2004,
Abstract:
Rotational Grazing System for Beef Cows on Dwarf Elephantgrass Pasture for Two Years after Establishment
M Mukhtar,Y Ishii
Journal of Animal Production , 2011,
Abstract: An intensive rotational grazing system for dwarf and late heading (DL) elephant grass (Pennisetum purpureum Schumach) pasture was examined in a summer period for two years following establishment. Four 0.05 of DL elephant grass pastures (20×25 m) were established on May 2003. They were rotationally grazed for 1 week, followed by a 3-week rest period by three breeding or raising beef cattle for three and six cycles during the first and second years of establishment respectively. Before grazing, the plant height, leaf area index and the ratio of leaf blade to stem were at the highest, while tiller number increased and herbage mass tended to increase, except for the first grazing cycle both two years and for one paddock in the second year. Herbage consumption, the rate of herbage consumption and dry matter intake tended to decrease in three paddocks from the first to the third cycle in the first year, but increase as grazing occurred in the second year. Dry matter intake averaged 10.2-14.5 and 15.4–23.2 g DM/kg/live weight (LW)/day over the four paddocks in the first and second year, respectively, and average daily gains were 0.09 and 0.35 kg/head/day in the first and second year respectively. The carrying capacities were estimated at 1,016 and 208 cow-days (CD)/ha (annual total 1,224 CD/ha) in the first year and 1,355 and 207 CD/ha (annual total 1,562 CD/ha) in the second year. Thus, DL elephant grass pasture can expand the grazing period for beef cows for the following two-year establishment. (Animal Production 13(1):10-17 (2011) Key Words: dwarf elephant grass, herbage mass, plant characters, rotational grazing
Plasma Wave Properties of the Schwarzschild Magnetosphere in a Veselago Medium
M. Sharif,Noureen Mukhtar
Physics , 2010, DOI: 10.1007/s10509-010-0430-y
Abstract: We re-formulate the 3+1 GRMHD equations for the Schwarzschild black hole in a Veselago medium. Linear perturbation in rotating (non-magnetized and magnetized) plasma is introduced and their Fourier analysis is considered. We discuss wave properties with the help of wave vector, refractive index and change in refractive index in the form of graphs. It is concluded that some waves move away from the event horizon in this unusual medium. We conclude that for the rotating non-magnetized plasma, our results confirm the presence of Veselago medium while the rotating magnetized plasma does not provide any evidence for this medium.
Hot Plasma Waves Surrounding the Schwarzschild Event Horizon in a Veselago Medium
M. Sharif,Noureen Mukhtar
Physics , 2011, DOI: 10.1007/s10509-011-0594-0
Abstract: This paper investigates wave properties of hot plasma in a Veselago medium. For the Schwarzschild black hole, the $3+1$ GRMHD equations are re-formulated which are linearly perturbed and then Fourier analyzed for rotating (non-magnetized and magnetized) plasmas. The graphs of wave vector, refractive index and change in refractive are used to discuss the wave properties. The results obtained confirm the presence of Veselago medium for both rotating (non-magnetized and magnetized) plasmas. This work generalized the isothermal plasma waves in the Veselago medium to hot plasma case.
Cracking Phenomenon in Spot Welded Joints of Austenitic Stainless Steel  [PDF]
Ahmed M. Al-Mukhtar, Qasim M. Doos
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.410081
Abstract:

The spot welds nugget cracking of austenitic stainless steel at temperatures between 700°C - 1010°C was investigated. Traditionally, the cracks have been observed around the spot nugget in welded temperature. Actually, these cracks are developed due to incomplete melting and inappropriate electrode pressure, which causes an expulsion of molten metal. These cracks start to grow and cause either the interface or plug fracture according to the loading type. In this work, the micro-cracks in the weld nugget were indicated for this type of steel at elevated temperature. Cracks appear in a certain range of temperature; about 700°C - 750°C. The cracks like defect and cavitations were presented. According to the fracture mechanics point of view, these cracks reduce the mechanical strength. Therefore, these cracks have to be taken into account with a certain precaution. Moreover, considering the working temperature and reducing the element may develop ferrite particles.

Second Kind Shifted Chebyshev Polynomials for Solving the Model Nonlinear ODEs  [PDF]
Amr M. S. Mahdy, N. A. H. Mukhtar
American Journal of Computational Mathematics (AJCM) , 2017, DOI: 10.4236/ajcm.2017.74028
Abstract: In this paper, we build the integral collocation method by using the second shifted Chebyshev polynomials. The numerical method solving the model non-linear such as Riccati differential equation, Logistic differential equation and Multi-order ODEs. The properties of shifted Chebyshev polynomials of the second kind are presented. The finite difference method is used to solve this system of equations. Several numerical examples are provided to confirm the reliability and effectiveness of the proposed method.
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