A5090508430- Atomic and Molecular Physics
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Chemical Physics Studies
- Optical Network Technologies
- Semiconductor Quantum Structures and Devices
- Laser-induced spectroscopy and plasma
- Muon and positron interactions and applications
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Heavy Metals in Plants
- Atomic and Subatomic Physics Research
- Heavy metals in environment
- Advanced Frequency and Time Standards
- Particle Detector Development and Performance
- Radiology practices and education
- Neutrino Physics Research
- Agricultural Science and Fertilization
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- Astrophysics and Star Formation Studies
- Gas Sensing Nanomaterials and Sensors
- Animal Diversity and Health Studies
- Cold Atom Physics and Bose-Einstein Condensates
Government of Khyber Pakhtunkhwa
2019-2024
Imperial College London
2024
Institute of Modern Physics
2017-2024
Fudan University
2022-2023
University of Peshawar
2019-2021
Pakistan Agricultural Research Council
2021
University of Essex
2010-2020
Chinese Academy of Sciences
2017-2020
University of Chinese Academy of Sciences
2017-2020
Kohat University of Science and Technology
2014
We report novel theoretical results obtained from combining the method of largest Lyapunov exponent (LLE) with spin-flip model (SFM), including noise, to a vertical-cavity surface emitting laser (VCSEL) subject polarized optical injection. The LLE is applied numerical solutions in order automatically calculate stability maps that characterize dynamics. SFM has been extended and generalized allow for injection arbitrary polarization. Measurements on 1550-nm VCSEL have used estimate values key...
The observatory has accumulated a vast archive of over 17,000 X-ray observations the last 25 years. However, standard data processing pipelines may fail to detect certain types transient sources, due their short-lived or dim nature. Identifying these sources is important for understanding full range temporal behaviour, as well that could be routinely detected by future missions such Athena aim this work reprocess archival using newly developed dedicated software in order identify neglected...
Electron–ion recombination of Be-like 40Ar14+ has been measured by employing the electron–ion merged-beams method at cooler storage ring CSRm. The absolute rate coefficients for collision energies from 0 to 60 eV are presented, covering all dielectronic (DR) resonances associated with 2s2 → 2s2p core transitions. In addition, strong trielectronic (TR) 2p2 transitions were observed. Both DR and TR processes lead series peaks in spectrum, which have identified Rydberg formula. Theoretical...
In this research article, an organic polymer based polypyrrole (Ppy) composite material has been synthesized and analyzed for the design fabrication purposes of a fast-responsive, highly sensitive, economical resistive-type novel humidity detection sensor. This sensor most suitably serves purpose industrial (i.e., values ranging from low to high) applications. First, (a mixture polypyrrole, polypyrrole-NiO, polypyrrole-CeO2, polypyrrole-Nb2O5) by chemical oxidative polymerization method,...
Abstract Electron–ion recombination rate coefficients for beryllium-like calcium ions in the center of mass energy from 0 to 51.88 eV have been measured by means electron–ion merged-beam technique at main cooler storage ring Institute Modern Physics Lanzhou, China. The measurement range covers dielectronic (DR) resonances associated with <?CDATA $2{s}^{2}{}^{1}{S}_{0}\to 2s2p{}^{3}{P}_{\mathrm{0,1,2}},{}^{1}{P}_{1}$?> core excitations and trielectronic (TR)...
Abstract Dielectronic recombination (DR) rate coefficients for carbon-like 40 Ca 14+ forming nitrogen-like 13+ have been measured using the electron–ion merged-beam technique at heavy-ion storage ring CSRm Institute of Modern Physics in Lanzhou, China. The DR energy range from 0 to 92 eV cover most resonances associated with 2 s p → and 3 core transitions (Δ N = 0). Theoretical calculations cross sections were carried out by two different state-of-the-art atomic theoretical techniques,...
Electron-ion recombination rate coefficients for fluorine-like nickel ions have been measured by employing the merged-beam technique at cooler storage ring CSRm Institute of Modern Physics in Lanzhou, China. The spectrum covers energy range 0–160 eV, including all dielectronic (DR) resonances associated with Δ N = 0 core excitations. DR cross sections this were calculated a relativistic configuration interaction method using flexible atomic code (FAC). Radiative (RR) obtained from modified...
The accuracy of dielectronic recombination (DR) data for astrophysics related ions plays a key role in astrophysical plasma modeling. absolute DR rate coefficient Fe17+ was measured at the main cooler storage ring Institute Modern Physics, Lanzhou, China. experimental electron-ion collision energy range covers first Rydberg series up to n = 24 resonances associated with core excitations. A theoretical calculation performed by using FAC code and compared coefficient. Overall reasonable...
We report the first comprehensive experimental analysis on dynamics of an optically injected 1550-nm vertical-cavity surface-emitting laser (VCSEL) over a wide temperature range going from -20 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> C to 60 . show variations with measured stability maps VCSEL when subject parallel and orthogonal polarized optical injection for different applied bias currents above threshold. The change in shape...
In this paper, we present detailed measurements of the temperature-dependent relaxation oscillation frequency and polarization resolved linewidth enhancement factor (α) a 1550-nm vertical cavity surface emitting laser (VCSEL). The thermal effects on these parameters are investigated for temperature range -20°C to 60°C. Comparison is made between experimental observations theoretical predictions similar VCSELs with those different in operating wavelength and/or materials.
Fruits are a natural source of antioxidants which inhibit the production and accumulation high reactive oxygen species (ROS), whereas heavy metals may initiate ROS.Therefore, most commonly used fruits such as apple, apricot, banana, cherry, grapes, guava, lemon, mango, orange, peach pomegranate were analysed for toxic (Cr, Co, Ni, Cd Pb).Acid digestion method was metal extraction.The analysis carried out using Flame Atomic Absorption Spectrophotometer (FAAS) (Perkin Elmer AAS-700).The...
The absolute rate coefficients for dielectronic recombination (DR) of sodiumlike krypton ions were measured by employing the electron-ion merged-beam technique at heavy-ion storage ring CSRm Institute Modern Physics in Lanzhou, China. DR spectrum covers collision energy range 0--70 eV, encompassing all resonances due to $3s\ensuremath{\rightarrow}3p$ and part from $3s\ensuremath{\rightarrow}3d(\mathrm{\ensuremath{\Delta}}n=0)$ $3s\ensuremath{\rightarrow}4l(\mathrm{\ensuremath{\Delta}}n=1)$...
We report results of measurements optically modulated optical transmittance GaAs doping superlattices. The data extend over a spectral region 1.39–1.58 eV. find that the peak transmission modulation reaches 21% for 2.6-μm-thick sample and an pump power density &lt;10 W/cm2 at room temperature. interpret our in framework simple semiclassical model includes Franz–Keldysh effect both below above bulk band gap, as well filling shrinkage effects.
The authors have studied the effects of polarised optical injection in a 1550 nm vertical-cavity surface-emitting laser (VCSEL) operated at currents up to 4.5 times threshold. Regions stable locking been measured for cases where injected signal is match one two polarisations fundamental transverse mode solitary VCSEL. In addition regions polarisation switching found case input matched that subsidiary variation this behaviour with current has investigated.
Electron-ion recombination of carbon-like Ar12+ forming Ar11+ has been investigated for the first time by using cooler storage ring CSRm at Institute Modern Physics in Lanzhou, China. The absolute rate coefficients are derived from measurement electron-ion collision energy range 0–50 eV, covering dielectronic (DR) resonances associated with 2s22p2 and 2s2p3 (Δn = 0) core excitations. Theoretical results obtained employing FAC code compared experimental spectrum. An overall agreement is found...
In order to extend the dielectronic recombination (DR) experiments from main cooler storage ring CSRm with intermediate charge state ions experimental CSRe highly charged and even radioactive ions, a test electron‐ion experiment of B‐like Ar 13+ was performed section new electron beam energy detuning system, which will be installed at CSRe. We present measured also calculated DR spectra for ∆ n = 0 resonances 3 eV. The results agree very well previous data CRYRING, resolution reached 30 meV...
The promising chemical, mechanical, and electrical properties of silver from nano scale to bulk level make it useful be used in a variety applications the biomedical electronic fields. Recently, several methods have been proposed applied for small-scale mass production form nanoparticles, nanowires, nanofibers. In this research, we novel method fabrication fibers (AgNFs) that is environmentally friendly can easily deployed large-scale production. Moreover, technique easy device different...