Natural Sciences: Recent submissions

Now showing items 201-220 of 6213

Surface, structural and mechanical properties of zirconium ablated by KrF excimer laser radiation

Ali, Nisar; Bashir, Shazia; Begum, Narjis; Syed Waqas, Ahmad (Institute of Physics, 2016-01-01)

We study the effect of the ambient – dry (air) and wet (propanol) – environment on the surface, structural and mechanical properties of zirconium samples after irradiation with a KrF excimer laser (wavelength of $248\ ...
Pulsar supernova remnant correlation

Qadir, A; Rafique, M (1986-01-01)

A formula is provided to check the correlation of pulsars and supernova remnants, using only observable pulsar parameters. The validity of this formula depends on the assumption that the value of the initial pulsar frequency ...
Morphological, mechanical and thermo-kinetic characterization of coal ash incorporated high performance PEO/PMMA thin film electrolyte composites

Sultana, Sabiha; Rehan, Imran; Rehan, Kamran; Khan, Mohammad Saleem; Noor-ul- Amin; Humayun, Muhammad; Tabassum, Safia; Minha, Aaliya (Institute of Physics, 2017-01-01)

In the present work indigenous coal ash of Pakistan was used to prepare polymeric nanocomposites with Poly (ethylene oxide) (PEO)/Poly (methyl methacrylate) (PMMA)/lithium perchlorate (LiClO4). The coal ash was first ...
Historical and Future Climatological Drought Projections Over QuettaValley, Balochistan, Pakistan

Durrani, Imran Hameed; Adnan, Shahzada; Aftab, Syed Mobasher (Institute of Physics, 2018-01-01)

The historical climatological records provide eminent evidence that drought is a permanent natural disastrous phenomenon of Balochistan. The precipitation data from 1950 to 2010 characterized that 18 drought ...
Role of masonry infill wall on the seismic behavior of typical four-storeybuilding in Pakistan

Ahmed, A; Ali, A; Khalid, Hammaad; Ahmad, M (Institute of Physics, 2018-01-01)

Masonry infill walls are used as partition in reinforced concrete frames and are considered as a non-engineeringstructure for design and analysis purposes. The goal of this study is to compare ...
Empirical SPT-CPT correlation for soils from Lahore, Pakistan

Alam, Mehtab; Aaqib, Muhammad; Sadiq, Shamsher; Mandokhail, Saeedullah Jan; Adeel, Muhammad Bilal; Maqsood-ur-Rehman; Nawaz AliKakar (Institute of Physics (IOP), 2018-01-01)

Standard Penetration Test (SPT) andcone penetration test (CPT) are the most widely used in situ tests to depict the soil stratigraphy and determine the geotechnical engineering of the subsurface soils. The CPT leaps ...
Air Pollution Deterministic Index Modeling: Application in Quetta,Pakistan

Akhtar; Shahkhan, F (Institute of Physics (IOP), 2018-01-01)

Mathematical model are applied to predict the sensitivity of climate to changes produced by natural phenomena and human activities. In this paper Air Pollution Deterministic Index Modeling (APDIM)for Pakistan ...
Thermodynamic investigation of M-cycle assisted open-cycle desiccantair conditioning systems

Niaz, Hassan; Sultan, Muhammad; Khan, Zahid Mahmood; Mahmood, Muhammad Hamid; Niaz, Yasir (Institute of Physics (IOP), 2018-01-01)

There is a necessity of lowcost air conditioning (AC) systems for the agriculturalsector of Pakistan e.g. product storage/preservation, greenhouse growing and thermal comfort of animals etc. Solid desiccant ...
Pulsar drift and rotational collapse

Asghar, Qadir; Rafique, M; Siddiqui, A W (Institute of Physics (IOP), 1987-01-01)

The relativistic explanation of pulsar drift is based on an extremely simplistic model. The collapsing star is treated as composed of a collection of particles falling radially inwards. A calculation incorporating a finite ...
Cascade-exciton model analysis of level density parameter dependence in proton induced fission cross sections of some sub-actinide nuclei

Yasin, Zafar; Iram, Warda; Asghar, Muhammad; Shahzad, M. Ikram (Institute of Physics (IOP), 2011-01-01)

Fission cross sections strongly depend on the ratio of the level density parameter in fission to neutron emission, af/an. In this work, a cascade-exciton model implemented in the code CEM95 has been used to observe this ...
Mass Transfer: a Deciding Factor for the Multiplicity of an Event in Deep Inelastic Collisions

Nasir, Tabassum; Baluch, J. J.; Khan, E. U.; Khattak, F. N.; Shahzad, M. I. (Institute of Physics (IOP), 2006-01-01)

Intermediate stage of the three and four-pronged events is investigated in the reaction 208Pb+ 197Au at beam energy 11.67 MeV/u. Multiprong events are analysed numerically using an empirical mass-dependent velocity-range ...
Electrostatic Dust Acoustic Solitons in Pair-Ion-Electron Plasmas

Hafeez Ur Rehman (Institute of Physics (IOP), 2012-01-01)

Using the reductive perturbation method, a Korteweg-de Vries (KdV) equation is derived to study the nonlinear properties of electrostatic collisionless dust acoustic solitons in pair-ion-electron (p-i-e) plasmas. The fluid ...
Formation of Co-implanted Silicon Ultra-Shallow Junctions for Low Thermal Budget Applications

Mustafa, Rehana; Ahmed, S.; Khan, E. U. (Institute of Physics (IOP), 2013-01-01)

We present a systematic study to create ultra-shallow junctions in n-type silicon substrates and investigate both pre- and post-annealing processes to create a processing strategy for potential applications in nano-devices. ...
Gamma irradiation-induced phase transitions of boron nitride nanoparticles

Khan, Hamdullah; Ahmad, Ishaq; Hussain, S S; Iqbal, Javed; Ikram, M; Malik, Maaza; khan, M Zubair; Ilyas, S; Jan, Tariq (Institute of Physics (IOP), 2019-10-23)

Recently different methods are explored to synthesize suparhard orthorhombic boron nitride (o-BN) nanomaterials which have a wide range of industrial applications in the sensors, fiters, battery, biological applications ...
Radiological implications of granite of northern Pakistan

Asgha, M; Tufail, M; Javied, Sabiha; Abid, A; Waqas, M (Institute of Physics (IOP), 2008-08-20)

Granite is an igneous rock that contains natural radioactivity of primordial radionuclides. In Pakistan, granite is distributed in a vast area called the Ambela Granitic Complex (AGC) in North West Frontier Province (NWFP). ...
Gender perceptions and adaptation strategies to climatic hazards-floodsin rural areas of District Sialkot, Punjab, Pakistan

Fitriani, N; Aymen, M; N ul Huda; Tufail, S M; Amir, S; Saud, M (Institute of Physics (IOP), 2019-01-01)

Climate change and its ramifications are evident in the form of global warming andfluctuations. Pakistan is mainly on arid geographical profile and resource scarcity, is among the highly vulnerable countries to climate ...
Astro Ltd. logo Astro Ltd. logo In vitro study of 5-aminolevulinic acid-based photodynamic therapy for apoptosis in human cervical HeLa cell line

Unknown author (Institute of Physics (IOP), 2009-08-11)

5-aminolevulanic acid (ALA), belonging among the promising second generation of sensitizers, was evaluated as an inducer of photodamage on HeLa (human cervical adenocarcinoma) cell line. A diode laser (635 nm) was used as ...
Measurement of radon concentration forassessment of the radiological hazard in theChakwal coalmines of the Salt Range, Pakistan

Mahmood, Arif; Tufail, M (Institute of Physics (IOP), 2011-02-01)

Radon and its progeny are prevalent everywhere on the lithosphere especiallyin the mining environment. Coal exists in the Salt Range that passes throughPakistan. The aim of the present study was to measure radon ...
Natural radioactivity measurements in Pakistan—an overview

Rahman, Said; Faheem, Munazza; Matiullah (Institute of Physics (IOP), 2018-11-24)

Humans have always been exposed throughout their period of existence to naturally occurring ionising radiation. Specifically, naturally occurring radionuclides are present in variable amounts in our environment. To assess ...
Varying Track Etch Rates along the Fission Fragments' Trajectories in CR-39 Detectors

Ali, N.; Khan, E. U.; Waheed, A.; Karim, S.; Khan, F.; Majeed, A. (Institute of Physics (IOP), 2010-01-01)

We determine the behavior of track etch rate VT along the tracks in CR-39 detectors exposed to fission fragments from 252Cf source. CR-39 detectors are etched at 70°C in different concentrations of Na2CO3-mixed 6M NaOH ...

Now showing items 201-220 of 6213

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