Kānpur, India
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Shukla R.K.,Vssd College | Kumar A.,PSIT | Srivastava U.,PSIT | Pandey V.K.,DBS College
International Journal of Thermophysics | Year: 2016

Density and acoustic velocity were measured for binary liquid mixtures of formamide, N-methylacetamide (NMA), dimethylformamide (DMF), and dimethylacetamide (DMA) with acetonitrile at atmospheric pressure and 293.15 K, 298.15 K, 303.15 K, 308.15 K, or 313.15 K over the concentration range 0.12 to 0.97. Models assuming association and nonassociation of the components of the mixtures were used to predict the behavior of the studied liquids, which would typically show weak interactions. The measured properties were fitted to the Redlich–Kister polynomial to estimate the binary coefficients and standard errors. The data were used to study the molecular interactions in the binary mixtures. Furthermore, the McAllister multibody interaction model was used to correlate the properties of the binary liquid mixtures. Testing of the nonassociation and association models for the different systems showed that, compared with the nonassociation model theoretical results, the association model theoretical results were more consistent with the experimental results. © 2016, Springer Science+Business Media New York.


Padalia H.,Regional Remote Sensing Center North | Bharti R.R.,Regional Remote Sensing Center North | Pundir Y.P.S.,Dbs College | Sharma K.P.,Dbs College
Journal of the Indian Society of Remote Sensing | Year: 2010

Increasing concern for biodiversity conservation at species level resulted in the development of cost effective tools for getting information at larger scale. Modeling distribution of species using remote sensing and geographic information has already proved its potentials to get such information with less effort. Pittosporum eriocarpum Royle is an endemic and threatened tree species of Uttarakhand, yet till now its regional distribution is poorly known. This study using geospatial modelling tools indentified several localities of potential occurrence of this species in the Mussoorie hills and Doon valley, and also provides information on its habitat specificity. The main objective of the study is to predict the suitable habitats for endangered plant species in Himalayan region using logistic regression model where availability of sufficient data on species presenceabsence is a major limitation for larger areas. © 2010 Indian Society of Remote Sensing.


Chauhan R.,DAV College Kanpur | Srivastava A.K.,Indian Institute of Technology Kanpur | Mishra M.,Dbs College | Srivastava K.K.,Dbs College
Integrated Ferroelectrics | Year: 2010

Bulk As40Se60 glass was prepared by melt quenching technique. Amorphous films of As40Se60 were prepared by thermal evaporation technique then exposed in UV light for 10 minutes. Virgin and exposed thin films were analyzed using transmission spectra to determine thickness (d), refractive index (n), extinction coefficient (κ), optical absorption coefficient (α), optical band gap (Eg) and real and imaginary parts of dielectric constants (ε′ and ε″). Results show 10 minutes UV exposure cause photodarkening (red shift in the optical band gap) and photorefraction (increase in refractive index) in As 40Se60 thin film, which can be utilized for various photonic applications. Copyright © Taylor & Francis Group, LLC.


Tripathi A.,Research Foundation for Education and Technology | Chauhan R.,DA V College | Chauhan R.,DBS College | Srivastava K.K.,DBS College
AIP Conference Proceedings | Year: 2013

A number of optical applications such as delivery of high power infrared light and optical signal processing require optical materials with photostablity. The photosensitivity of amorphous chalcogeides is well known and thus it is a question, if these materials can be used when photostability is a requirement. Present study reports dependence of photostability with glass network connectivity (given in terms of Mean Coordination Number (MCN)). The investigation of photostability in amorphous Ge6.5As 37.5Se56 (MCN=2.50) thin film for UV light (λ = 365, 436 nm) is done. The usability of the composition is discussed for upcoming optical application. © 2013 AIP Publishing LLC.


Singh C.P.,Dbs College | Singh A.,Dbs College | Nibha,Gorakhpur University | Daniliuc C.G.,University of Munster | And 2 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2015

Abstract The mixed-ligand mononuclear hexacoordinate cadmium perchlorate complex [Cd(2,2'-bipy)2(H2O)(ClO4)]ClO4 was synthesized and characterized by FT-IR, elemental analysis and X-ray crystal structure determination. Thermal characteristics of the complex were studied by thermogravimetry (TG), differential thermal analysis and differential scanning calorimetry. The complex is stable at normal temperature and undergoes dehydration in between the temperature range 95-200°C with loss of coordinated water (2.8 %). Thereafter, on increasing temperature, dehydrated complex shows some gradual mass loss followed by fast decomposition at higher temperature (265-380°C). The kinetic parameters for the decomposition of the complex were investigated by applying model-fitting and isoconversional method on isothermal TG data recorded at five different temperatures. To explore the response of complex to sudden high heat, explosion delay time was recorded at five different temperatures, and kinetics of explosion was investigated using these data. © 2015 Akadémiai Kiadó, Budapest, Hungary.


Tiwari S.,Nmsn Das College | Saxena A.K.,Nmsn Das College | Saxena D.,Dbs College
Asian Journal of Chemistry | Year: 2011

The effect on the optical and other physical properties with the addition of Ag content, viz, Tg, , Hs, , Z, Ncon, L, δEg and energetic parameter A of Ge30-xSe70Agx (x = 0, 5, 10, 15, 20 at %) glassy alloy have been examined theoretically. The relationship between the Tg and has been estimated by using Tichy-Ticha approach. The relationship between ΔEg and chemical composition has been discussed in terms of the Hs and Z. In order to correlate the optical parameter (DEg) with film composition we used the energetic parameter (A). It has been found that , Hs, (ΔE g), Tg, decreases whereas deviation of stoichiometry R, Ncon and the energetic parameter A, increases with increasing Ag content in Ge-Se-Ag system.


Kumar A.,H.B.T.I. | Agarwal P.,Dbs College | Saxena A.,CJM University
AIP Conference Proceedings | Year: 2013

The phase change memory is the revolutionary technology for computer world today. Phase change memory alloy is composed of chalcogenide glasses. In the present work Ag is doped in binary Se70Te30 system and activation energy of crystallization is calculated. These ternary alloys are explored in various fields like photo doping, optical imaging, and phase change optical recording. The crystallization kinetics of various ternary Se 70Te30-xAgx(x=0,2,4,6) alloys are studied by using Non-isothermal Iso-Conversional methods. The dependence of activation energy Ec is discussed by various methods. The result shows that the activation energy Ec plays a vital role in proving these materials as best applicable materials in optical phase change recording devices. © 2013 AIP Publishing LLC.


Dixit S.C.,Dbs College | Singh R.K.,P.A. College
E-Journal of Chemistry | Year: 2012

Reactions of dichlorobis(cyclopentadienyl)zirconium (IV) with pyridinedicarboxylic acids viz. quinolinic acids (QAH2), 2, 4-pyridine dicarboxylic acid (PAH2), isocinchomeronic acid (IAH 2), cinchomeronic acid(cAH2) and dinicotinic acid(dAH 2) were carried out in different stoichiometric ratios. Complexes of the type Cp2Zr (QAH)Cl, Cp2Zr (QAH)2, Cp2Zr (PAH)Cl, Cp2Zr (PAH)2, Cp2Zr (IAH)Cl, Cp 2Zr (IAH)2, Cp2Zr(cAH)Cl, Cp 2Zr(cAH)2, Cp2Zr(dAH)Cl and Cp 2Zr(dAH)2 were obtained. These new complexes were characterized on the basis of their elemental analyses, electrical conductance, magnetic moment and spectral data.


Kumari S.,Dr. M.G.R. Educational and Research Institute | Khan M.K.,King Saud University | Muhaya F.B.,King Saud University | Kumar R.,Dbs College
Proceedings - 2013 International Symposium on Biometrics and Security Technologies, ISBAST 2013 | Year: 2013

Smart card is a widely accepted user authentication tool to ensure only authorized access to resources available via open networks. In 2010, Sood et al. and Song independently examined a smart card based authentication scheme proposed by Xu et al. They showed that in Xu et al.'s scheme an internal user of the system could turn hostile to impersonate other users of the system. Sood et al. and Song also proposed schemes in order to improve scheme proposed by Xu et al.'s. Recently, Chen et al. identified some security problems in the improvements proposed by Sood et al. and Song. To fix these problems Chen et al. presented another scheme, which they claimed to provide mutual authentication and withstand, lost smart card attack. Undoubtedly, in their scheme user can also verify the legitimacy of server but we find that the scheme fails to resist impersonation attacks and privileged insider attack. We also show that the scheme does not provide user anonymity and confidentiality to air messages. In addition, an attacker can guess a user's password from his lost/stolen smart card. © 2013 IEEE.


The present study was made in Sarsainawar and adjacent areas of Etawah district of Uttar Pradesh. Sarsainawar is a northern part of district known for its vast herbal flora. About 21 plant species belonging to 17 families used in the homeopathic system of medicine are highlighted in the present study along with their taxonomic description including botanical name, family, common name, plant's part used, medicine name, and homeopathic uses for ailment against which the medicines are used. The collected plant specimens were identified, taxonomically defined and submitted in the herbarium of Department of Botany, DBS College, Kanpur, for future records.

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