Dj College

Baraut, India

Dj College

Baraut, India
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Jain D.,Skk Jain Pg College | Singh K.S.,Dj College | Kumar V.,Dj College | Sharma S.,Gurukul Kangri Vishwavidyalaya | Rao M.P.S.,GMR Institute of Technology
AIP Conference Proceedings | Year: 2013

A simple design of an omni-directional reflector based on Ge/Sio 2 has been presented. The photonic band gap (PBG) of this photonic crystal for TE and TM mode at different angles of incidence is calculated numerically using transfer matrix method. It is found that this type of photonic crystal has omni-direction reflection in near infrared region, which can be used in various application such as deformable mirror, high resolution InAs camera etc. © 2013 AIP Publishing LLC.

Sharma S.,Gurukul Kangri Vishwavidyalaya | Kumar R.,Gurukul Kangri Vishwavidyalaya | Singh K.S.,Dj College | Kumar A.,Amity University | Kumar V.,Dj College
Optik | Year: 2015

The effect of the refractive index profile on the omnidirectional reflector (ODR) of one dimensional dielectric and semiconductor multilayer structure having linearly graded material has been simulated using transfer matrix method. The theoretical analysis shows that the proposed structure works as a perfect mirror within a certain wavelength range. These wavelength ranges can be completely controlled by the refractive index profile of a graded semiconductor layer and also observed that these wavelength ranges are also controlled by refractive index parameters. Reflectance characteristics of 1D binary and ternary photonic crystal (PC) structure have been studied. This property shows that the ODR range of structure increased when a third layer of semiconductor added in a binary photonic crystal. © 2015 Elsevier GmbH.

Kumar V.,Jv College | Kumar V.,Dj College | Kumar P.,Ms College | Kumar A.,Amity University | Ojha S.P.,IIMT
AIP Conference Proceedings | Year: 2013

A simple design of omni-directional reflector based on one dimensional superconductor-semiconductor photonic crystal has been proposed. The proposed structure consists of a periodic array of alternate layers of YBa 2Cu3O7 or YBCO (superconductor) and Si (semiconductor) as the materials of low and high refractive indices respectively. The refractive indices of YBCO and Si layers are taken as the function of temperature and wavelength both. Therefore, this study may be considered to be more physically realistic. The propagation characteristics of the proposed structure are analyzed by the transfer matrix method. © 2013 AIP Publishing LLC.

Singh K.P.,University of Agriculture and Technology | Dobhal R.,Uttarakhand State Council for Science and Technology | Prajapati R.K.,Dj College | Kumar S.,University of Agriculture and Technology | And 2 more authors.
Desalination and Water Treatment | Year: 2010

Molecular imprinting technique is used for preparing molecularly imprinted polymer (MIP) membranes of desired recognition site, selectivity and porosity. The novelty of present work is to use a new approach for preparing imprinted monolith membrane, to study the effect of membrane porosity generated due to molecular imprinting on irreversible thermodynamical characteristics like membrane potential, ion transport, fixed charge density and permselectivity. It seems significant in developing membranes of desired selectivity and porosity for the removal and recognition of templates molecules. MIPs of potent herbicides isoproturon and 2,4-d were prepared by radical polymerization using methyl methacrylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) as functional monomer and cross linking agent. The polymer synthesis took place on a microporous support, which form hydrogen, covalent and ionic bonds with templates in order to form MIP membranes. The significance of this work is to discuss transport study of MIP membranes after creation of molecular recognition sites within the coated MIP. The MIP membranes were studied using theory of irreversible thermodynamics and by evaluating contact angle measurement, surface energy, ion transport study, perms electivity and fixed charge density of the membranes. © 2010 Desalination Publications. All rights reserved.

Pal S.,Mmh College | Kumar R.,Dj College | Singh R.,Mmh College
Journal of Electron Spectroscopy and Related Phenomena | Year: 2012

The modified Jain-Khare semi-empirical formalism for the evaluation of differential and integral electron impact ionization cross sections for molecules has been extended to the evaluation of cross sections for the electron ionization of CO2 clusters: (CO2)240 and (CO2)1700. The energy dependent differential cross sections are evaluated at the incident electron energies of 50, 100 and 200 eV. The integral total ionization cross sections have been calculated in the energy range varying from ionization thresholds to 1000 eV which revealed a good agreement with the available experimental and the theoretical data. The ionization rate coefficients have also been evaluated using the presently calculated ionization cross sections and Maxwell-Boltzmann energy distributions. © 2012 Elsevier B.V. All rights reserved.

Singh K.P.,Govind Ballabh Pant University of Agriculture & Technology | Ahalawat S.,Govind Ballabh Pant University of Agriculture & Technology | Prajapati R.K.,Dj College | Kumar S.,Jv College | And 2 more authors.
Ionics | Year: 2010

Molecularly imprinted polymer (MIP) membranes were used to develop highly sensitive chemical sensors for the detection of herbicide 2,4-dichlorophenoxy acetic acid (2,4-d). The 2,4-d imprinted composite MIP membranes were prepared, and the characterization was done by UV-VIS spectrophotometer, Fourier transform infrared spectroscopy, and scanning electron microscopy, and the same were fitted in a new electrochemical sensor model. Membrane electroconductivity measurements were performed by applying a small-amplitude alternating voltage (20 mV) with a varying frequency from 20 Hz to 80 kHz generated by a low-frequency wave form generator. The measured changes in the membrane ionic/electric conductivity as a function of 2,4-d concentration was allowed to evaluate the recognition properties of the prepared membrane. This sensor is useful in detecting 2,4-d herbicide having concentration range 10-3 M to 10-6 M. The cross-selectivity of the sensor, reproducibility of results, and reusability of MIP membrane were examined and found remarkable and recommendable. © 2010 Springer-Verlag.

Malik J.V.,Jv College | Kumar A.,Amity University | Kumar V.,Dj College | Kumar A.,P.A. College | Singh T.P.,Jv College
AIP Conference Proceedings | Year: 2013

Thermal effect on photonic band gap (PBG) in dispersive semiconductor based one-dimensional photonic crystal has been investigated. ZnS/air and Ge/air multilayer structures have been taken in our calculation. The refractive indices of both semiconductor layers are taken as a function of temperature and wavelength both. Therefore, this study may be considered to be more physically realistic. The effect of temperature and angle of incidence on reflection spectra of proposed structure for TE polarization has been studied. The PBG can be tuned by varying the temperature of the geometry. The propagation characteristics of the proposed structure are analyzed by the transfer matrix method. © 2013 AIP Publishing LLC.

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