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Search Results: 1 - 10 of 7619 matches for " Muhammad Sharif "
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Anisotropic Universe Models with Perfect Fluid and Scalar Field in f(R,T) Gravity
Muhammad Sharif,Muhammad Zubair
Physics , 2013, DOI: 10.1143/JPSJ.81.114005
Abstract: In this paper, we study the behavior of perfect fluid and massless scalar field for homogeneous and anisotropic Bianchi type I universe model in $f(R,T)$ gravity, where $R$ is the Ricci scalar and $T$ is the trace of the energy-momentum tensor. We assume the variation law of mean Hubble parameter to obtain exact solutions of the modified field equations. The physical and kinematical quantities are discussed for both models in future evolution of the universe. We check the validity of null energy condition and conclude that our perfect fluid solution can behave like phantom model. Finally, we find that perfect fluid solutions correspond to massless scalar field models.
Energy Conditions Constraints and Stability of Power Law Solutions in f(R,T) Gravity
Muhammad Sharif,Muhammad Zubair
Physics , 2012, DOI: 10.7566/JPSJ.82.014002
Abstract: The energy conditions are derived in the context of $f(R,T)$ gravity, where $R$ is the Ricci scalar and $T$ is the trace of the energy-momentum tensor, which can reduce to the well-known conditions in $f(R)$ gravity and general relativity. We present the general inequalities set by the energy conditions in terms of Hubble, deceleration, jerk and snap parameters. In this study, we concentrate on two particular models of $f(R,T)$ gravity namely, $f(R)+\lambda{T}$ and $R+2f(T)$. The exact power-law solutions are obtained for these two cases in homogeneous and isotropic $f(R,T)$ cosmology. Finally, we find certain constraints which have to be satisfied to ensure that power law solutions may be stable and match the bounds prescribed by the energy conditions.
Demand and Response in Smart Grids for Modern Power System  [PDF]
Muhammad Qamar Raza, Muhammad Usman Haider, S. Muhammad Ali, Muhammad Zeeshan Rashid, Farooq Sharif
Smart Grid and Renewable Energy (SGRE) , 2013, DOI: 10.4236/sgre.2013.42016
Abstract:

Micro-grid plays a vital role in fulfilling the increasing demand by using distributed renewable energy resources. Demand and response technique can be broadly classified under the setup DR deployed (e.g. ISO’s/RTO’s). Demand response program can be implemented to improve power system quality, reliability and increasing demand. In modern power industry, strategic player can take more benefit from more emphasized DR study in terms of social benefit (uninterrupted power supply to consumers) and economy. This paper proposes the distributed micro-grid control and implemented control setup implemented demand response algorithm, which provides better power system reliability. This paper presents contingencies control demand and response for micro-grid. The main advantage of implementation of demand and response algorithms in Micro-grids provides reliable power supplies to consumers. The proposed micro-grid TCP/IP setup provides a chance to respond the contingencies to recover the shed to active condition. Micro-grid controller implements demand and response algorithm reasonable for managing the demand of the load and intelligent load scheme in case of blackout.

Charged Perfect Fluid Cylindrical Gravitational Collapse
Muhammad Sharif,Ghulam Abbas
Physics , 2011, DOI: 10.1143/JPSJ.80.104002
Abstract: This paper is devoted to study the charged perfect fluid cylindrical gravitational collapse. For this purpose, we find a new analytical solution of the field equations for non-static cylindrically symmetric spacetime. We discuss physical properties of the solution which predict gravitational collapse. It is concluded that in the presence of electromagnetic field the outgoing gravitational waves are absent. Further, it turns out that when longitudinal length reduces to zero due to resultant action of gravity and electromagnetic field, then the end state of the gravitational collapse is a conical singularity. We also explore the smooth matching of the collapsing cylindrical solution to a static cylindrically symmetric solution. In this matching, we take a special choice of constant radius of the boundary surface. We conclude that the gravitational and Coulomb forces of the system balance each other.
Cosmic Evolution in Self-Interacting Brans-Dicke Cosmology
Muhammad Sharif,Saira Waheed
Physics , 2012, DOI: 10.1143/JPSJ.81.114901
Abstract: In this paper, we investigate the nature of self-interacting potential that can support the accelerated expansion of the universe as indicated by observational data. For this purpose, we consider the Bianchi type I (BI) universe model in the Brans-Dicke (BD) field scenario and use a power law for both the scalar field and the scale factor. It is found that the accelerated expansion of the universe can be discussed for a positive power law potential with negative values of the BD parameter. We also explore the evolution of energy density perturbations. This analysis indicates that the model allows growing modes for negative values of the BD parameter and $m>0$.
Integrating Requirements with SLI Layer for Cloud Computing Services to Meet SLA and QoS  [PDF]
Muhammad Irfan, Zhu Hong, Muhammad Irfan Sharif, Ahmed Junaid Haq Qureshi, Rakhshanda Kanwal, Muhammad Imran
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.63018
Abstract:

Cloud computing is high technology, which fulfills needs of common as well as enterprise level to meet their information and communication technology requirements and so on. Cloud computing extends existing information technology capabilities and requirements. Many technologies are being merged with cloud computing, same as that orchestrations can boost cloud service provisioning process. The usage of orchestrations can play vital role to provision cloud services. Cloud service providers can create scalable cloud services at low cost by organizing cloud infrastructure by using cloud orchestrations. Dynamic orchestration flows can generate required cloud computing services to meet service level agreements and quality of services. There is a need to understand issues and barriers involved to integrate cloud orchestrations with cloud service provisioning process. There is also need to understand business related problems bordering cloud computing technology. There is much capacity to do targeted research work for cloud orchestrations and its integration with service level agreements as well as with SLI (service level integration) layer. In this article we have elaborated detailed analysis and identified a number of issues that will affect the cloud service users as well as cloud service providers and cloud service provisioning system. We are defining an approach to orchestrate cloud infrastructure by using orchestration flows, to generate cloud services in order to meet service level agreements and quality of standard.

Effect of Arbuscular Mycorrhiza Fungal Inoculation with Compost on Yield and P Uptake of Wheat in Alkaline Calcareous Soil  [PDF]
Bismillah Jan, Muhammad Sharif, Farmanullah Khan, Jehan Bakht
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513213
Abstract:

An experiment was conducted in pots under natural conditions in alkaline calcareous soil to determine wheat (Triticum aestivum L. c.v. Atta Habib) yield and P uptake as influenced by Arbuscular mycorrhizal fungi (AMF) inoculation with compost prepared from fresh animal dung and rock phosphate. Data indicated that wheat grain, shoot and roots yields increased significantly (P ≤ 0.05) by inoculation of commercial mycorrhiza (AMF-II) and half dose of compost. Grain yield increased by 43% and 37%, shoot by 43% and 39% and roots yield by 51% and 45% over control of N and K fertilizers. Straw yield was maximum as 5075 kg·ha-1 in the treatment of AMF-II inoculation with full dose of compost, which was significantly (P ≤ 0.05) higher as 44% and 40% over control of N and K fertilizers. Maximum and significantly (P ≤ 0.05) higher plant N and P uptake by wheat were observed in the treatment inoculated by indigenous mycorrhiza (AMF-I) with full dose of compost followed by the inoculation of AMF-II with full dose of compost and SSP treatment. Maximum and significantly (P ≤ 0.05) increased soil spores’ density of AMF by 26 spores per 20 g soil with maximum roots infection intensity in wheat were observed by the inoculation of AMF-I with full dose of compost. The AMF-II is slightly better than AMF-I regarding grain, shoot and root yield, whereas AMF-I is better in N, P uptake, soil spore density and their root infection intensity than AMF-II. Alone inoculation and compost application increase the yield and nutrients uptake but the highest improvement was observed with inoculation of AMF with compost. Results suggest that inoculation of AMF with compost has potential to improve wheat yields and plants’ P uptake under given soil conditions.

Second opinion and discrepancy in the diagnosis of soft tissue lesions at surgical pathology
Sharif Muhammad,Hamdani Syed Naeem
Indian Journal of Pathology and Microbiology , 2010,
Abstract: Objective: To determine the frequency and magnitude of discrepancies in the surgical pathological diagnosis of soft tissue lesions on review and second opinion in a histopathology center. Study Design: Cross-sectional, observational. Place and Duration of Study: Department of Histopathology, Armed Forces Institute of Pathology, Rawalpindi, from April 2006 to May 2007. Materials and Methods: All the cases of soft tissue as well as bone lesions, irrespective of age and gender, which were referred for second opinion or review after being reported elsewhere, were included in the study. A panel of antibodies of soft tissue, epithelial and lymphoid markers was applied according to the requirements of each case. The cases were categorized as category A where there was concurrence between initial diagnosis and diagnosis at review. Category B included cases where there was disagreement in the specific diagnostic entity as per WHO classifications without therapeutic implications. Category C was cases where the category of benign or malignant diagnosis remained the same but there was disagreement in the specific diagnosis with definite therapeutic implications. Category D had diagnosis of benign changed to malignant while category E had cases where diagnosis of malignancy was changed to a benign lesion. Results: During the study period, 34 cases of soft tissue lesions were received for review and second opinion. The mean age of the patients was 39 22 years and immunohistochemistry was performed in 21 (62%) of 34 cases. Concurrence between the review and initial diagnosis was seen in 18 (53%) cases (category A). Discrepancy in the diagnosis at review and initial consultation was seen in 16 (47%) cases. There were four (11.8%) cases that were placed in category B as the diagnosis of benign and malignant remained the same but the specific diagnostic entity was changed. Category C included eight (23.5%) cases where the review diagnosis changed the therapeutic modality despite the benign or malignant category remaining unchanged. All the cases in this category required immunohistochemistry as diagnosis of metastatic carcinoma was changed to sarcoma in two cases and diagnosis of sarcoma was changed to carcinoma in three cases. There was only one (2.9%) case in category D where a benign diagnosis was changed to malignant on review and three (8.8%) cases reported as malignant had a revised diagnosis of benign lesion, placing them in category E. Conclusion: In the absence of a quality assurance regulatory body to monitor and overlook the professional competence of practi
Dust Static Spherically Symmetric Solution in $f(R)$ Gravity
Muhammad Sharif,Hafiza Rizwana Kausar
Physics , 2011, DOI: 10.1143/JPSJ.80.044004
Abstract: In this paper, we take dust matter and investigate static spherically symmetric solution of the field equations in metric f(R) gravity. The solution is found with constant Ricci scalar curvature and its energy distribution is evaluated by using Landau-Lifshitz energy-momentum complex. We also discuss the stability condition and constant scalar curvature condition for some specific popular choices of f(R) models in addition to their energy distribution.
Real Time Face Detection Using Skin Detection (Block Approach)
Muhammad Sharif,Sajjad Mohsin,Muhammad Younas Javed
Journal of Applied Computer Science & Mathematics , 2011,
Abstract: Role of Face recognition in security applications can never be overstated, that is why researchers around the world are still actively participating in this area. The initial step in the procedure of face recognition is to detect it efficiently. In this paper, a hybrid technique is being proposed using skin detection (in RGB color space) and block approach. This fusion is proposed to achieve fast skin detection. Along with the fusion, template matching is also used for detection purpose. Block approach for skin detection means dividing the image into square blocks virtually and then applying the detection ratios on corner pixels. If the corner pixels satisfy the ratios completely, the whole block will be considered as a skin block and if none of them satisfies these ratios, the block will be treated as a non-skin block. Even if some of the corner pixels satisfy the ratios, then the block will be searched for skin pixels. In this way, it will rapidly detect a face in an image including high resolution pixels. The experiments are carried out and the results have shown the significant improvements both in time and accuracy of the detection, that has prove the fastness and robustness of the proposed technique.
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