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Now showing items 1 - 16 of 782

  • Studies on p-TiO2/n-graphene heterojunction for hydrogen detection

    Dutta, D.   Hazra, S.K.   Das, J.   Sarkar, C.K.   Basu, S.  

    Thermally oxidized p-type Si [resistivity (5-10) Omega cm and < 1 0 0 > orientation] with oxide thickness of 245 nm was used as the substrate for the deposition of graphene by CVD. The formation of multilayer graphene (MLG) was confirmed by Raman spectroscopy. A heterojunction was fabricated by sol-gel coating of TiO2 on CVD grown graphene layer. The formation of titanium dioxide was verified by electron dispersion spectroscopy (EDS). The surfaces of TiO2, graphene as well as p-TiO2/n-graphene interface were characterized by scanning electron microscopy (SEM). Detail sensor study of the p-TiO2/n-graphene heterojunction was performed by taking two lateral catalytic metal (Pd) contacts deposited by e-beam evaporation. The response time of 16 s and the corresponding recovery time of 61 s were obtained for 0.5% H-2 in air at 125 degrees C. The p-TiO2/n-graphene junction showed selectivity for H-2 compared to methane. The stability study was performed and it showed almost the steady results over a period of 3 days as tested by the discrete measurements. The sensing mechanism was formulated using a simplified energy band diagram. (C) 2015 Elsevier B.V. All rights reserved.
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  • 774: A potent betulenic acid analogue induces apoptosis in HT29 cells

    Dutta, D.   Chakraborty, B.   Chowdhury, C.   Das, P.  

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  • EP-1066: CyberKnife treatment in liver tumours: Initial experience from India

    Dutta, D.   Sudhar, H.   Balaji, S.   Jayaraj, G.   Murli, V.   Kurup, P.G.  

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  • Pion-induced Drell-Yan processes and the flavor-dependent EMC effect

    Dutta, D.   Peng, J. C.   Clo?t, I. C.   Gaskell, D.  

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  • Measuring the axial form factor of 3He using weak capture of polarized electrons

    Dutta, D.  

    A low energy, high intensity polarized electron beam could enable the extraction of the A=3 weak axial form factors F A using the reaction rarre+ 3Herarr 3H+nu. These form factors have never been measured before. We discuss the feasibility of such an experiment using a small toroidal magnet and a radial low energy recoil detector to tag the recoil tritons. A moderately high intensity polarized electron beam (>500 muA) with beam energies between 50 - 150 MeV is necessary for the cross section measurement and to provides a free clean measurement of the background. Moreover, in addition to the cross section, by measuring the electron spin and recoil triton correlation coefficient it may be possible to search for second class currents and to extract the ratio of the axial to the vector form factor of the nucleon. Such novel electron scattering based measurements would have a completely different set of systematic uncertainties compared to polarized neutron beta decay, neutrino scattering and muon capture experiments which are typically used to extract the weak form-factors.
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  • A Nonlinear Acoustic Technique for Crack Detection in Metallic Structures

    Dutta, D.   Sohn, H.   Harries, K. A.   Rizzo, P.  

    A crack detection technique based on nonlinear acoustics is investigated in this study. Acoustic waves at a chosen frequency are generated using an actuating lead zirconate titanate (PZT) transducer, and they travel through the target structure before being received by a sensing PZT wafer. Unlike an undamaged medium, a cracked medium exhibits high acoustic nonlinearity which is manifested as harmonics in the power spectrum of the received signal. Experimental results also indicate that the harmonic components increase nonlinearly in magnitude with increasing amplitude of the input signal. The proposed technique identifies the presence of cracks by looking at the two aforementioned features: harmonics and their nonlinear relationship to the input amplitude. The effectiveness of the technique has been tested on aluminum and steel specimens. The behavior of these nonlinear features as crack propagates in the steel beam has also been studied.
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  • Correlation of ion dynamics and structure of superionic tellurite glasses

    Dutta, D.   Ghosh, A.  

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  • Properties of HflX, an Enigmatic Protein from Escherichia coli

    Dutta, D.   Bandyopadhyay, K.   Datta, A. B.   Sardesai, A. A.   Parrack, P.  

    The Escherichia coli gene hflX was first identified as part of the hflA operon, mutations in which led to an increased frequency of lysogenization upon infection of the bacterium by the temperate coliphage lambda. Independent mutational studies have also indicated that the HflX protein has a role in transposition. Based on the sequence of its gene, HflX is predicted to be a GTP-binding protein, very likely a GTPase. We report here purification and characterization of the HflX protein. We also specifically examined its suggested functional roles mentioned above. Our results show that HflX is a monomeric protein with a high (30% to 40%) content of helices. It exhibits GTPase as well as ATPase activities, but it has no role in lambda lysogeny or in transposition.
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  • Revealing Color Forces with Transverse Polarized Electron Scattering

    Armstrong, W.   Kang, H.   Liyanage, A.   Maxwell, J.   Mulholland, J.   Ndukum, L.   Ahmidouch, A.   Albayrak, I.   Asaturyan, A.   Ates, O.   Baghdasaryan, H.   Boeglin, W.   Bosted, P.   Brash, E.   Butuceanu, C.   Bychkov, M.   Carter, P.   Chen, C.   Chen, J.-P.   Choi, S.   Christy, M. E.   Covrig, S.   Crabb, D.   Danagoulian, S.   Daniel, A.   Davidenko, A. M.   Davis, B.   Day, D.   Deconinck, W.   Deur, A.   Dunne, J.   Dutta, D.   El Fassi, L.   Ellis, C.   Ent, R.   Flay, D.   Frlez, E.   Gaskell, D.   Geagla, O.   German, J.   Gilman, R.   Gogami, T.   Gomez, J.   Goncharenko, Y. M.   Hashimoto, O.   Higinbotham, D.   Horn, T.   Huber, G. M.   Jones, M.   Jones, M. K.   Kalantarians, N.   Kang, H-K.   Kawama, D.   Keith, C.   Keppel, C.   Khandaker, M.   Kim, Y.   King, P. M.   Kohl, M.   Kovacs, K.   Kubarovsky, V.   Li, Y.   Liyanage, N.   Luo, W.   Mack, D.   Mamyan, V.   Markowitz, P.   Maruta, T.   Meekins, D.   Melnik, Y. M.   Meziani, Z.-E.   Mkrtchyan, A.   Mkrtchyan, H.   Mochalov, V. V.   Monaghan, P.   Narayan, A.   Nakamura, S. N.   Nuruzzaman, A.   Pentchev, L.   Pocanic, D.   Posik, M.   Puckett, A.   Qiu, X.   Reinhold, J.   Riordan, S.   Roche, J.   Rondón, O. A.   Sawatzky, B.   Shabestari, M.   Slifer, K.   Smith, G.   Soloviev, L. F.   Solvignon, P.   Tadevosyan, V.   Tang, L.   Vasiliev, A. N.   Veilleux, M.   Walton, T.   Wesselmann, F.   Wood, S.   Yao, H.   Ye, Z.   Zhang, J.   Zhu, L.  

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  • and a measurement of the branching fraction for

    Dutta, D.   Bhuyan, B.   Abdesselam, A.   Adachi, I.   Aihara, H.   Al Said, S.   Arinstein, K.   Asner, D.?M.   Aulchenko, V.   Aushev, T.   Ayad, R.   Aziz, T.   Bahinipati, S.   Bakich, A.?M.   Bansal, V.   Bhardwaj, V.   Bobrov, A.   Bonvicini, G.   Bra?ko, M.   Browder, T.?E.   ?ervenkov, D.   Chen, A.   Cheon, B.?G.   Chilikin, K.   Chistov, R.   Cho, K.   Chobanova, V.   Choi, Y.   Cinabro, D.   Dalseno, J.   Dole?al, Z.   Drásal, Z.   Drutskoy, A.   Dutta, K.   Eidelman, S.   Farhat, H.   Fast, J.?E.   Frost, O.   Gaur, V.   Ganguly, S.   Garmash, A.   Getzkow, D.   Goh, Y.?M.   Golob, B.   Hayashii, H.   He, X.?H.   Hou, W.-S.   Iijima, T.   Ishikawa, A.   Iwasaki, Y.   Jaegle, I.   Joffe, D.   Kang, K.?H.   Kato, E.   Kiesling, C.   Kim, D.?Y.   Kim, J.?B.   Kim, J.?H.   Kim, K.?T.   Kim, M.?J.   Kim, S.?H.   Kim, Y.?J.   Kinoshita, K.   Ko, B.?R.   Kody?, P.   Korpar, S.   Kri?an, P.   Krokovny, P.   Kuhr, T.   Kuzmin, A.   Kwon, Y.-J.   Lange, J.?S.   Lee, I.?S.   Lewis, P.   Li, Y.   Li Gioi, L.   Libby, J.   Liventsev, D.   Matvienko, D.   Miyata, H.   Mizuk, R.   Mohanty, G.?B.   Moll, A.   Mori, T.   Mussa, R.   Nakano, E.   Nakao, M.   Nanut, T.   Nayak, M.   Nisar, N.?K.   Nishida, S.   Ogawa, S.   Okuno, S.   Pakhlov, P.   Pakhlova, G.   Pedlar, T.?K.   Pestotnik, R.   Petri?, M.   Piilonen, L.?E.   Ribe?l, E.   Ritter, M.   Rostomyan, A.   Sakai, Y.   Sandilya, S.   Santelj, L.   Sanuki, T.   Sato, Y.   Savinov, V.   Schneider, O.   Schnell, G.   Schwanda, C.   Schwartz, A.?J.   Semmler, D.   Shebalin, V.   Shibata, T.-A.   Shiu, J.-G.   Shwartz, B.   Sibidanov, A.   Simon, F.   Sohn, Y.-S.   Sokolov, A.   Solovieva, E.   Stari?, M.   Sumihama, M.   Sumiyoshi, T.   Teramoto, Y.   Trabelsi, K.   Uchida, M.   Unno, Y.   Uno, S.   Usov, Y.   Van Hulse, C.   Vanhoefer, P.   Varner, G.   Vinokurova, A.   Vossen, A.   Wagner, M.?N.   Wang, C.?H.   Wang, P.   Watanabe, Y.   Wehle, S.   Williams, K.?M.   Won, E.   Yamamoto, H.   Yamaoka, J.   Yashchenko, S.   Yusa, Y.   Zhang, Z.?P.   Zhilich, V.   Zupanc, A.  

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  • Fixation Temperature Affects DNA Integrity in the Testis as Measured by the TUNEL Assay

    Dutta, D.   Park, I.   Mills, N. C.  

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  • Pore structure of silica gel: a comparative study through BET and PALS

    Dutta, D.   Chatterjee, S.   Pillai, K.T.   Pujari, P.K.   Ganguly, B.N.  

    Porous nature of silica gel samples comprising of micro- and meso-pores were studied with the help of positron annihilation lifetime spectroscopy based on a simple and realistic model which was further compared by nitrogen gas adsorption method namely Brunauer, Emmett and Teller isotherm. The final results illustrate the merits and fineness of the former, the extent of corroboration of the results and also the discrepancies accruing due to the limitations of the latter.
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  • Is overnight tube feeding associated with hypoxia in stroke?

    Dutta, D.   Wood, T.   Thomas, R.   Asrar ul Haq, M.  

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  • Energetics of ice nucleation in mesoporous titania using positron annihilation spectroscopy

    Thangswamy, Muthulakshmi   Dutta, D.   Maheshwari, Priya   Sen, Debasis   Pujari, P. K.  

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  • Bound states in continuum in effective-mass models

    Dutta, D.   Roy, P.  

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  • Conditionally exactly solvable potentials and exceptional orthogonal polynomials

    Dutta, D.   Roy, P.  

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