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Search Results: 1 - 10 of 402262 matches for " M. Umar Farooq "
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Interacting holographic dark energy with logarithmic correction
Mubasher Jamil,M. Umar Farooq
Physics , 2010, DOI: 10.1088/1475-7516/2010/03/001
Abstract: The holographic dark energy (HDE) is considered to be the most promising candidate of dark energy. Its definition is originally motivated from the entropy-area relation which depends on the theory of gravity under consideration. Recently a new definition of HDE is proposed with the help of quantum corrections to the entropy-area relation in the setup of loop quantum cosmology. Using this new definition, we investigate the model of interacting dark energy and derive its effective equation of state. Finally we establish a correspondence between generalized Chaplygin gas and entropy-corrected holographic dark energy.
Phantom Wormholes in (2+1)-dimensions
Mubasher Jamil,M. Umar Farooq
Physics , 2010, DOI: 10.1007/s10773-010-0263-z
Abstract: In this paper, we have constructed a (2+1)-dimensional wormhole using inhomogeneous and anisotropic distribution of phantom energy. We have determined the exact form of the equation of state of phantom energy that supports the wormhole structure. Interestingly, this equation of state is linear but variable one and is dependent only on the radial parameter of the model.
Interacting Holographic Viscous Dark Energy Model
Mubasher Jamil,M. Umar Farooq
Physics , 2009, DOI: 10.1007/s10773-009-0176-x
Abstract: In this manuscript, we present a generalization of the interacting holographic dark energy model using the viscous generalized Chaplygin gas. We also study the model by considering a dynamical Newton's constant $G$. Then we reconstruct the potential and the dynamics of the scalar field which describe the viscous Chaplygin cosmology.
Non-equilibrium thermodynamics of dark energy on the power-law entropy corrected apparent horizon
M. Umar Farooq,Mubasher Jamil
Physics , 2011, DOI: 10.1139/p11-126
Abstract: We investigate the Friedmann-Robertson-Walker (FRW) universe (containing dark energy) as a non-equilibrium (irreversible) thermodynamical system by considering the power-law correction to the horizon entropy. By taking power-law entropy area law which appear in dealing with the entanglement of quantum fields in and out the horizon, we determine the power-law entropy corrected apparent horizon of the FRW universe.
Dynamics and Thermodynamics of (2+1)-Dimensional Evolving Lorentzian Wormhole
M. Umar Farooq,M. Akbar,Mubasher Jamil
Physics , 2010, DOI: 10.1063/1.3518333
Abstract: In this paper we study the relationship between the Einstein field equations for the (2+1)-dimensional evolving wormhole and the first law of thermodynamics. It has been shown that the Einstein field equations can be rewritten as a similar form of the first law of thermodynamics at the dynamical trapping horizon (as proposed by Hayward) for the dynamical spacetime which describes intrinsic thermal properties associated with the trapping horizon. For a particular choice of the shape and potential functions we are able to express field equations as a similar form of first law of thermodynamics $dE=-TdS+WdA$ at the trapping horizons. Here $E=\rho A$, $T=-\kappa /2\pi $, $S=4\pi \tilde{r}_{A}$, $W=(\rho -p)/2$%, and $A=\pi \tilde{r}_{A}^{2}$, are the total matter energy, horizon temperature, wormhole entropy, work density and volume of the evolving wormhole respectively.
Bio-Economic Assessment of Different Sunflower Based Intercropping Systems at Different Geometric Configurations
Rashid Saleem,M. Umar Farooq,Riaz Ahmed
Pakistan Journal of Biological Sciences , 2003,
Abstract: Studies to see the comparative productive efficiency and feasibility of different sunflower based intercropping systems were conducted at Agronomic Research area, University of Agriculture, Faisalabad. Intercropping systems included sunflower alone, sunflower + mash and sunflower + mung. Sunflower was sown in 90 cm apart single rows as well as 90 cm apart double row strips. The results of studies indicated that when sunflower grown alone gave the maximum yield of 2.89 t ha ̄1 followed by 2.75 t ha ̄1 in 90 cm apart single row and 90 cm apart double row strips respectively as against when sunflower sown in combination with mung and mash, gave the yield of 2.41 and 2.24 t ha ̄1. It is disserted that intercropping is more beneficial than sole cropping, although it has adverse effect on the main crop but this loss is compensated by additional harvest of intercrops in the term monetary returns. Among the various intercropping treatments sunflower-mashbean was appeared to be highly profitable and gave the highest income of Rs. 37995.51 with the highest BCR value of 3.72 was recorded in case of sunflower + mashbean as against minimum income of Rs. 27618.75 with BCR of 3.02 for sunflower alone in 90 cm apart double rows strips. Therefore intercropping can be practiced to maximize the crop production from the unit area under pertaining condition.
Estimation of Root and Shoot Biomass of Cenchrus ciliaris (Dhaman) Under Barani Conditions
M. Umar Farooq,Rashid Saleem,Abdul Razzaq
Pakistan Journal of Biological Sciences , 2003,
Abstract: Cenchrus ciliaris a palatable and nutritious grass is a warm season grass. Arid and semi-arid rangeland are reseeded with Cenchrus ciliaris to enhance productivity, prolong grazing season and increase carrying capacity. A two ha land area was reseeded with Cenchrus ciliarisat target area Jamrud in June 1980, under barani conditions. Generally shoot biomass is determined at the end of growing season after seed maturity stage. Root shoot and root biomass of Cenchrus ciliarishas not estimated/determined at the end of spring season. The different growing season (spring summer) is lacking. Estimation of shoot and root biomass of Cenchrus ciliaris plant in two growing different seasons is essential in grazing management studies. At the beginnings of spring season reserve carbohydrates are used for the production of new shoots. The shoot biomass at the end of spring season is generally less compared to the end of summer season. The shoot and root biomass estimating of Cenchrus ciliaris plant at the end of two different growing season is required to devise the grazing management programme. This study is proposed to quantify the shoot and root biomass of Cenchrus ciliaris plant at the end of spring and summer growing seasons.
Quality Practices in Open Source Software Development Affecting Quality Dimensions
Sheikh Umar Farooq,S. M. K. Quadri
Trends in Information Management , 2011,
Abstract: Purpose: The quality of open source software has been a matter of debate for a long time now since there is a little concrete evidence to justify it. The main concern is that many quality attributes such as reliability, efficiency, maintainability and security need to be carefully checked, and that fixing software defects pertaining to such quality attributes in OSDM (Open Source Development Model) can never be guaranteed fully. In order to diminish such concerns, we need to look at the practices which affect these quality characteristics in OSS (Open Source Software) negatively. This paper presents an exploratory study of the quality dimensions and quality practices and problems in OSDM. An insight of these problems can serve as a start point for improvements in quality assurance of open source software. Design/Methodology/Approach:A survey was administered based on existing literature. On the basis of this survey those practices in OSDM are described which affect quality attributes negatively in OSS. Findings:The quality characteristics which should be taken into consideration to select or evaluate OSS are presented. Furthermore, quality practices in OSDM which affect the quality of OSS in a negative manner have also been highlighted. Research Implications:Further research is suggested to identify other quality problems not found in this paper and to evaluate the impact of different practices on project quality. Originality/Value:As a first step in the development of practices and processes to assure and further improve quality in open software projects, in addition to quality attributes, existing quality practices and quality problems have to be clearly identified. This paper can serve as a start point for improvements in quality assurance of open source software’s.
A Novel Approach for Evaluating Software Testing Techniques for Reliability
Sheikh Umar Farooq,S. M. K Quadri
ARPN Journal of Systems and Software , 2012,
Abstract: One of the major goals of software testing is to increase reliability of the software. As pointed out by many studies, fault detection does not necessarily increase the reliability of the software when all failures are considered to be equivalent to one another. Accordingly, we need to evaluate software testing techniques to check which technique is more suitable and effective in terms of increasing confidence by reducing risk (by detecting and isolating faults which affect reliability most). We here present a novel experiment which compares three defect detection techniques for reliability. Preliminary results suggest that testing techniques differ in terms of their ability to reduce risk in the software.
Thermodynamics of interacting entropy-corrected holographic dark energy in a non-flat FRW universe
Mubasher Jamil,Ahmad Sheykhi,M. Umar Farooq
Physics , 2010, DOI: 10.1142/S0218271810018116
Abstract: A so-called "entropy-corrected holographic dark energy" (ECHDE), was recently proposed to explain the dark energy-dominated universe with the help of quantum corrections to the entropy-area relation in the setup of loop quantum cosmology. Using this new definition, we investigate its thermodynamical features including entropy and energy conservation. We describe the thermodynamical interpretation of the interaction between ECHDE and dark matter in a non-flat universe. We obtain a relation between the interaction term of the dark components and thermal fluctuation. Our study further generalizes the earlier works [M.R. Setare and E.C. Vagenas, Phys. Lett. B 666 (2008) 111; B. Wang et al., Phys. Lett. B 662 (2008) 1] in this direction.
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