Natural Sciences: Recent submissions

Now showing items 121-140 of 6213

Photodetachment of H− near a Hard Spherical Surface

Haneef, M.; Ahmad, Iftikhar; Afaq, A.; Rahman, A. (Chinese Physical Society and IOP Publishing Ltd, 2012-01-01)

The photodetachment of a hydrogen negative ion (H−) near a hard spherical surface is investigated by using the theoretical imaging method. The surface is oriented in such a fashion that the laser polarization direction is ...
Efficiency of plasma focus for argon K-series line radiation emission

Zakaullah, M; Alamgir, Khalid; Murtaza, G; Waheed, A (Institute of Physics, 2000-01-01)

X-radiation emission from a low-energy Mather-type plasma focus operated with argon is investigated. Attention is paid to finding the pressure range for the highest argon K-series line emission. The argon line radiation ...
Variations of PM2.5, PM10 mass concentrationand health assessment in Islamabad, Pakistan

Mehmood, Tariq; Ahmad, I; Akram, W (Institute of Physics, 2018-01-01)

Sparse information appears in lack of awareness among the people regarding the linkage between particulate matter (PM) and mortality in Pakistan. The current study is aimed to investigate the seasonal mass ...
Nonplanar Electrostatic Solitary Waves in a Relativistic Degenerate Dense Plasma

Ata-ur-Rahman; Mushtaq, A.; Ali, S.; Qamar, A. (Institute of Physics, 2013-01-01)

By employing the reductive perturbation technique, the propagation of cylindrical and spherical ion acoustic solitary waves is studied in an unmagnetized dense relativistic plasma, consisting of relativistically degenerate ...
Photodetachment of a Homo-Nuclear Linear Tetra-Atomic Negative Molecular Ion

Rahman, A.; Ahmad, Iftikhar; Afaq, A. (Institute of Physics, 2012-01-01)

The photodetachment of a homo-nuclear linear tetra-atomic negative molecular ion is studied theoretically for an arbitrary laser polarization. An expression for the total cross section is obtained by using an extended ...
Non-Thermal Effects on CO–NO Surface Catalytic Reaction on Square Surface: Monte Carlo Study

Khalid, M.; Qaisrani, A. U.; Ahmad, W. (Chinese Physical Society and IOP Publishing Ltd, 2005-01-01)

A Monte Carlo simulation of the CO–NO heterogeneous catalytic reaction over a square surface has already been studied with a model based on the Langmuir–Hinshelwood (LH) mechanism. The results of this study are well known. ...
Confined focused sheet beam flow of a thermionic linear electron source

Alvi, A.; Iqbal, M.; Rehman, A.; Islam, G. (Institute of Physics, 2019-01-01)

A magnetically confined sheet beam has been designed and tested for its uniform transmission. The beam is fully immersed in a uniform magnetic field of 50 Gauss which bends and focuses the beam throughout in a uniform ...
Magnetic electron drift vortex in magnetized plasma

Khizar, M; Mirza, Arshad M; Salahuddin, M; Qaisar, M S (1997-01-01)

The Magnetic Electron Drift Vortex (MEDV) modes in a homogeneous magnetized plasma are investigated using the Braginskii's fluid model for electrons. It is found that the modes become unstable when the propagation is in ...
Apoptotic effect of α-Fe2O3 and SiO2 nanoparticles in human rhabdomyosarcoma cell line

Fatima, Mahvish; Atif, M; Fakhar-e-Alam, Muhammad; Zaidi, S S Z; Suleman, R; Shakoor, Muhammad Nadeem; Afzal, Muhammad; Waseem, Muhammad; Aziz, Muhammad Hammad (Institute of Physics, 2014-01-01)

Nanotechnology provides the opportunity for the development of new materials in the nanometer size range, with many potential applications in biological sciences and clinical medicine. It has been reported that RD (muscle ...
Modelling and simulation for installation feasibility of standalonephotovoltaic system for Quetta, Pakistan

Muhammad, T Z (Institute of Physics, 2018-01-01)

The impactand significance of renewable energy in developing countries is increasing rapidly in latest years. There is much need of energy dependence to be based on off grid photovoltaic systems in developing ...
Investigation of Linear Tetra-Atomic Negative Ion by Photodetached-Electron Spectra

Rahman, A.; Ahmad, Iftikhar; Afaq, A.; Haneef, M.; Zhao, H. J. (Chinese Physical Society and IOP Publishing Ltd, 2011-01-01)

Photodetachment spectra from a linear tetra-atomic negative ion is investigated by treating the detached-electron wave function quantum mechanically. A plane polarized laser light, perpendicular to the axis of the ion, is ...
Biogenic synthesis of green and cost effective cobalt oxide nanoparticles using Geranium wallichianum leaves extract and evaluation of in vitro antioxidant, antimicrobial, cytotoxic and enzyme inhibition properties

Iqbal, Javed; Abbasi, Banzeer Ahsan; Batool, Riffat; Khalil, Ali Talha; Hameed, Safia; Kanwal, Sobia; Ikram Ullah; Mahmood, Tariq (Institute of Physics, 2019-10-25)

In the present study, the CoONPs were simply synthesized using Geranium wallichianum leaves extract as both reducing and stabilizing agents, which were further studied for diverse biological applications (antibacterial, ...
Gravitomagnetic Effects on Collective Plasma Oscillations in Compact Stars

Mirza, Babur M.; Saleem, Hamid (Institute of Physics, 2006-01-01)

The effects of gravitomagnetic force on plasma oscillations are investigated using the kinetic theory of homogeneous electrically neutral plasma in the absence of external electric or magnetic field. The random phase ...
Investigation of 50 Hz Pulsed DC Nitrogen Plasma with Active Screen Cage by Trace Rare Gas Optical Emission Spectroscopy

Saeed, A.; Khan, A. W.; Shafiq, M.; Jan, F.; Abrar, M.; Zaka-Ul-Islam, M.; Zakaullah, M. (Institute of Physics, 2016-01-01)

Optical emission spectroscopy is used to investigate the nitrogen-hydrogen with trace rare gas (4% Ar) plasma generated by 50 Hz pulsed DC discharges. The filling pressure varies from 1 mbar to 5 mbar and the current density ...
Femtosecond laser induced nanostructuring of zirconium in liquid confined environment

Ali, Nisar; Bashir, Shazia; Umm-i-Kalsoom; Rafique, M. Shahid; Begum, Narjis; Ajami, Ali (Chinese Physical Society and IOP Publishing Ltd, 2017-01-01)

The surface, structural, and mechanical properties of zirconium after irradiation with Ti: sapphire laser (800 nm, 30 fs, 1 kHz) have been investigated. The zirconium targets were exposed for a varying number of laser ...
Absorbed dose estimations of 131I for critical organs using the GEANT4 Monte Carlo simulation code

Ziaur Rahman; Shakeel ur Rehman; Arshed, Waheed; Mirza, Nasir M; Rashid, Abdul; Zeb, Jahan (Institute of Physics, 2012-02-01)

The aim of this study is to compare the absorbed doses of critical organs of 131I using the MIRD (Medical Internal Radiation Dose) with the corresponding predictions made by GEANT4 simulations. S-values (mean absorbed dose ...
Structural, electronic, and optical properties of ZnO1−xSex alloys using first-principles calculations

Rashid, Muhammad; Hussain, Fayyaz (Institute of Physics, 2013-01-01)

The structural, electronic, and optical properties of binary ZnO, ZnSe compounds, and their ternary ZnO1−xSex alloys are computed using the accurate full potential linearized augmented plane wave plus local orbital (FP-LAPW ...
Structural, electronic, and optical properties of ZnO1−xSex alloys using first-principles calculations

Rashid, Muhammad; Hussain, Fayyaz; Imran, Muhammad; Ahmad, S A; Noor, N A; Sohaib, M U; Alay-e-Abba, S M (Institue of physics, 2013-01-01)

The structural, electronic, and optical properties of binary ZnO, ZnSe compounds, and their ternary ZnO1−xSex alloys are computed using the accurate full potential linearized augmented plane wave plus local orbital (FP-LAPW ...
Anisotropic Energy Loss of a Pair of Charged Projectiles in a Dusty Plasma

Murtaza, G; Nasim, M H (Institue of physics, 2001-01-01)

By employing a dielectric approach, the energy loss of a pair of test charged projectiles passing through a multicomponent dusty plasma, retaining two ion correlation effects is computed. The numerical results are presented ...
Biosynthesis of silver nanoparticles from Hyphaene thebaica fruits and their in vitro pharmacognostic potential

Mohamed, Hamza Elsayed Ahmed; Afridi, Shakeeb; Khalil, Ali Talha; Zia, Dania; Iqbal, Javed; Ikram Ullah; Shinwar, Zabta Khan; Maaza, Malik (Institue of physics, 2019-01-01)

Hyphaene thebaica fruit extracts were applied as a low cost bio-reductant as well as capping agents for the biosynthesis of anisotropic silver nanoparticles (AgNPs). The AgNPs (4.5 nm–70 nm) revealed interesting morphologies ...

Now showing items 121-140 of 6213

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