Saluja N.,Lingayas University |
Khanna R.,Thapar University
International Journal of Microwave and Wireless Technologies | Year: 2013
In this paper, a new compact hybrid fractal antenna with ultrawideband (UWB) behavior is proposed. Two merged fractals shapes, i.e. Sierpinski carpet and Sierpinski Gasket fed with coplanar waveguide (CPW) feed make patch as multiband and broadband antenna. The antenna is optimized using particle swarm optimization for side length of Sierpenski Gasket fractal and bandwidth. The overall width of the patch is taken as a parameter for optimizing bandwidth. The total size of presented antenna is 59 × 29 mm2. The antenna resonates at 2-5.2 GHz, so that wideband operation is observed. Antenna with this type of characteristics can be used when UWB response at lower frequencies is required. Sierpenski Gasket performs two functions in the proposed design, i.e. to radiate as well as impedance transformer to Sierpenski carpet. The proposed design presents novelty in design to achieve proper impedance matching to edge of Sierpenski carpet design with CPW feed by making Sierpenski Gasket as impedance transformer. © Cambridge University Press and the European Microwave Association 2013.
Sharma M.K.,Thapar University |
Kanwar S.,Lingayas University |
Sawhney G.,Thapar University |
Gupta R.K.,Panjab University
Physical Review C - Nuclear Physics | Year: 2012
The dynamical cluster-decay model (DCM) is used to study the odd-mass nuclear systems 213Fr * (with N=126) and 217Fr * (with N=130) formed in 19F + 194 ,198Pt reactions. The measured anomaly in fission anisotropy for 213Fr * in this reaction is said to be due to either the possible role of the magic N=126 shell of the compound nucleus (CN) or the presence of a noncompound nucleus component, such as quasifission, in the fission cross section. Our calculations are made within the DCM for the fragments having quadrupole (β 2) deformations with orientations of compact, hot configurations, compared with spherical as well as β 2-β 4 deformed considerations. For quadrupole deformed fragments (with "optimal" orientations), the calculated fission cross-sections (as well as the evaporation residue cross-sections) match the data nearly exactly, without invoking a significant contribution from quasifission. The calculated fission mass distribution for the two systems is quite similar for either of the spherical, β 2- alone deformed, and β 2-β 4 deformed choices of fragments. A small hump or shoulder is seen in fragment preformation yields for the deformed case (β 2 or β 2-β 4) in both the systems due to a deformed closed shell around Z 2=36 and a spherical magic shell around Z 1=50, which for 213Fr * (N=126) decay is somewhat more pronounced as compared to 217Fr * (N=130). Note that the magic shell of the CN proton/neutron number plays no role in DCM. © 2012 American Physical Society.
Saluja N.,Lingayas University
Elektronika ir Elektrotechnika | Year: 2012
In this paper modified feed for Sierpensiki gasket Fractal shaped is presented. Sierpensiki gasket structure is most widely used method in microstrip patch antenna design for multiband operation. But Sierpensiki gasket antenna suffers from the problem of reach of current density over complete fractal patch. In this paper a modified feeding structure is proposed for triangular shaped Sierpensiki gasket fractal patch antenna to have uniform current density throughout the fractal patch. The improvement is studied in terms of return loss and efficiency of antenna. Proposed feeding technique improves power flow throughout antenna so that it reaches small fractal as well as larger fractal structures. The simulated result shows agreement with the theoretical results. © Kauno technologijos universitetas, 2012.
Sharma S.K.,Lingayas University
Journal of Alloys and Compounds | Year: 2010
In the present paper, we present a method to predict the temperature dependence of thermal energy from room temperature to their melting temperatures at atmospheric pressure i.e., P = 1 bar or 105 Pa. We find that the calculated results of thermal energy are in good agreement with the experimental data. We employ the present relationship to NaCl and KCl to validate the present model. Present study also reveals that the temperature dependence of thermal energy shows linearity with isothermal bulk modulus. A close agreement between results and experimental data discloses the validity of present work. © 2010 Elsevier B.V. All rights reserved.
Sharma R.,Lingayas University |
Tiwari R.K.,Jiwaji University
Journal of Applied Crystallography | Year: 2015
Ebastine belongs to the category of second-generation non-sedating H1 receptor antagonists and is chiefly used for the treatment of allergic rhinitis and chronic urticaria. The present paper reports findings on the crystal and molecular structure of ebastine, employing the technique of single-crystal X-ray diffraction. Ebastine crystallizes in the monoclinic P21/c space group with unit-cell dimensions a = 16.5890(12), b = 10.9575(8), c = 16.6795(11)Å, β = 113.623(2)°, V = 2777.8(3)Å3, Z = 4 and calculated density amounting to 1.123Mgm-3. The structure factor value was observed 1016 and final R = 0.0496 for 4360 unique reflections. The piperidine ring in the ebastine molecule was found to exist in a chair conformation, and the C - N bond length was 1.459(3)Å, thereby showing good agreement with the standard C - N bond length of 1.472Å. © 2015 International Union of Crystallography.