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Search Results: 1 - 10 of 1698 matches for " Naseer Iqbal "
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Gravitational Waves: Present Status and Future Prospectus  [PDF]
Naseer Iqbal, Showkat Monga
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.65033
Abstract:

Remarkable progress has been made during recent years on the development of gravitational wave detectors. The review describes the present status and future prospectus of the gravitational wave astronomy. The main theme is to review the prominent long baseline detectors in operation around the world and proposed baseline and space-borne interferometers. Looking to the future, the major upgrades to the ground based detectors and new planned detectors will be completed over the coming years, which will create a network of detectors with the significantly improved sensitivity required to detect gravitational waves. Beyond this, the concept and design of possible future “third generation” gravitational-wave detectors will be discussed. Sources such as coalescing compact binary systems, neutron stars in low-mass X-ray binaries, stellar collapses and pulsars are all possible candidates for detection.

Entropy changes in the clustering of galaxies in an expanding universe  [PDF]
Naseer Iqbal, Mohammad Shafi Khan, Tabasum Masood
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.31009
Abstract: In the present work the approach-thermody- namics and statistical mechanics of gravitating systems is applied to study the entropy change in gravitational clustering of galaxies in an expanding universe. We derive analytically the expressions for gravitational entropy in terms of temperature T and average density n of the particles (galaxies) in the given phase space cell. It is found that during the initial stage of clustering of galaxies, the entropy decreases and finally seems to be increasing when the system attains virial equilibrium. The entropy changes are studied for different range of measuring correlation parameter b. We attempt to provide a clearer account of this phenomena. The entropy results for a system consisting of extended mass (non-point mass) particles show a similar behaviour with that of point mass particles clustering gravitationally in an expanding universe.
The peculiar velocity and temperature profile of galaxy clusters
Tabasum Masood,Naseer Iqbal
Physics , 2013,
Abstract: Dynamical parameters like average velocity dispersion and temperature profile of galaxy clusters are determined using a quasi equilibrium thermodynamic theory. The calculated velocity dispersion results from theory and simulations shows a good agreement with the velocity dispersion results of (Abdullah et al. \cite{Abd11}). An Adaptive Mesh Refinement (AMR), Grid based hybrid code have been used to carry out the simulations. Our results indicate that the average velocity dispersion profile of $20$ Abell galaxy clusters falls in the range of $500-1000$ km/s and their temperature profile is of the order of $10^7$ to $10^8$K calculated on the basis of kinetic theory. The data in the plot shows a significant contribution of gravitating particles clustering together in the vicinity of cluster center and beyond a certain region this velocity dies out and gets dominated by the Hubble's flow due to which all the galaxy clusters in an expanding universe participate in Hubble's expansion.
Study of impact materials of akhnoor meteor crater in Jammu and Kashmir (India)  [PDF]
Naseer Iqbal, Ajaz Ahmad, Tabasum Masood, M. N Vahia
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.36058
Abstract: A sample of Akhnoor meteor crater, which fell on 2nd January 2009 in Jammu District, Jammu & Kashmir, India, has been analyzed for ele-mental composition by Spectroscopic tech-niques. Concentrations of 17 major, minor and trace elements were determined. The authentic-ity of the meteorite sample was established by comparing its composition with those of stan-dard meteorites/chondrite. The classification of the sample has been made by comparing the abundances and concentration ratios of ele-ments with other known meteorites.
A Legal Perspective of E-Businesses and E-Marketing for Small and Medium Enterprises (SMEs)
Muneeb Iqbal,Atif Ali Khan,Oumair Naseer
International Journal of Managing Information Technology (IJMIT) , 2013,
Abstract: Electronic businesses are witnessing enormous growth as more and more people are switching to onlineplatforms. The widespread use of Internet has opened new channels to operate trade for many businesses.Also electronic marketing has become a proven channel of passing on the word to the customers. Legal andethical issues quickly become an area of concern. In this research recommendations are made toharmonize IT and Internet Laws. A novel approach is proposed to promote legal risk management culturein organizations. It begins with revising current state of regulations surrounding eBusinesses andelectronic marketing. The proposed approach offers risk management by considering risk mitigationstrategy, educating people and use of information technology. Monitoring compliance requirements aremet by reviewing the latest changes in regulations and rewarding the employees who ensures the successfulimplementation of the strategy.
A legal perspective of E-business and E-marketing for small and medium enterprises
Muneeb Iqbal,Atif Ali Khan,Oumair Naseer
Computer Science , 2013,
Abstract: Electronic businesses are witnessing enormous growth as more and more people are switching to online platforms. The widespread use of Internet has opened new channels to operate trade for many businesses. Also electronic marketing has become a proven channel of passing on the word to the customers. Legal and ethical issues quickly become an area of concern. In this research recommendations are made to harmonize IT and Internet Laws. A novel approach is proposed to promote legal risk management culture in organizations. It begins with revising current state of regulations surrounding eBusinesses and electronic marketing. The proposed approach offers risk management by considering risk mitigation strategy, educating people and use of information technology. Monitoring compliance requirements are met by reviewing the latest changes in regulations and rewarding the employees who ensures the successful implementation of the strategy.
Effect of Cigarette Smoking on Erythrocytes, Leukocytes and Haemoglobin
Iqbal Zafar,Khan Naseer Mohammad,Muhammad Nisar,Mazhar Rashida
Journal of Medical Sciences , 2003,
Abstract: The association of erythrocytes and leukocytes count and haemoglobin level with cigarette smoking was studied and results were compared with non-smokers. The erythrocytes count in smokers was significantly high (p< 0.0005) compared with the non-smokers. The leukocytes count was significantly higher (p< 0.02) in non-smokers compared with the smokers. The difference in haemoglobin level was also significant (p > 0.05) between smokers and non-smokers, smokers being having low level of Hb. The number of cigarettes smoked per day and length of smoking showed the negative correlation with erythrocytes count and positive correlation with leukocytes. The haemoglobin also showed the negative correlation with the number of cigarettes per day (r = -0.57) and period of smoking (r = -0.46).
The Effect of X-ray Irradiation on the Time Dependent Behaviour of Accretion Disks with Stochastic Perturbations
Bari Maqbool,Ranjeev Misra,Naseer Iqbal,Naveel Ahmad
Physics , 2015, DOI: 10.1093/mnras/stv239
Abstract: The UV emission from X-ray binaries, is more likely to be produced by reprocessing of X-rays by the outer regions of an accretion disk. The structure of the outer disk may be altered due to the presence of X-ray irradiation and we discuss the physical regimes where this may occur and point out certain X-ray binaries where this effect may be important. The long term X-ray variability of these sources is believed to be due to stochastic fluctuations in the outer disk, which propagate inwards giving rise to accretion rate variation in the X-ray producing inner regions. The X-ray variability will induce structural variations in the outer disk which in turn may affect the inner accretion rate. To understand the qualitative behaviour of the disk in such a scenario, we adopt simplistic assumptions that the disk is fully ionised and is not warped. We develop and use a time dependent global hydrodynamical code to study the effect of a sinusoidal accretion rate perturbation introduced at a specific radius. The response of the disk, especially the inner accretion rate, to such perturbations at different radii and with different time periods is shown. While we didn't find any oscillatory or limit cycle behaviour, our results show that irradiation enhances the X-ray variability at time-scales corresponding to the viscous time-scales of the irradiated disk.
Correlation functions for extended mass galaxy clusters
Naseer Iqbal,Naveel Ahmad,Mubashir Hamid,Tabasum Masood
Physics , 2012, DOI: 10.1111/j.1745-3933.2012.01281.x
Abstract: The phenomenon of clustering of galaxies on the basis of correlation functions in an expanding Universe is studied by using equation of state, taking gravitational interaction between galaxies of extended nature into consideration. The partial differential equation for the extended mass structures of a two-point correlation function developed earlier by Iqbal, Ahmad and Khan is studied on the basis of assigned boundary conditions. The solution for the correlation function for extended structures satisfies the basic boundary conditions, which seem to be sufficient for understanding the phenomena, and provides a new insight into the gravitational clustering problem for extended mass structures.
QCM-Arrays for Sensing Terpenes in Fresh and Dried Herbs via Bio-Mimetic MIP Layers
Naseer Iqbal,Ghulam Mustafa,Abdul Rehman,Alexander Biedermann,Bita Najafi,Peter A. Lieberzeit,Franz L. Dickert
Sensors , 2010, DOI: 10.3390/s100706361
Abstract: A piezoelectric 10 MHz multichannel quartz crystal microbalance (MQCM), coated with six molecularly imprinted polystyrene artificial recognition membranes have been developed for selective quantification of terpenes emanated from fresh and dried Lamiaceae family species, i.e., rosemary (Rosmarinus Officinalis L.), basil (Ocimum Basilicum) and sage (Salvia Officinalis). Optimal e-nose parameters, such as layer heights (1–6 KHz), sensitivity
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