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Ramakrishnan, G. (author), Kumar, N. (author), Planken, P.C.M. (author), Tanaka, D. (author), Kajikawa, K. (author)Emission of terahertz radiation is observed when surface plasmons are excited on a thin film of gold, in the Kretschmann geometry. When a hemicyanine-terminated alkanethiol self-assembled monolayer of thickness 1.2 nm is deposited on the gold film, stronger terahertz emission is observed. Our experimental results confirm that enhanced terahertz...journal article 2012
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Ingolfsson, O. (author), Kumar, R. (author), Hagen, C.W. (author), Hari, S. (author)To study the potential role of low energy secondary electrons in focused electron beam induced deposition (FEBID) we have studied FEBID using 1,1-dichloro-1-silacyclohexane, silacyclohexane and 1,3,5-trisilacyclohexane. While the first of these compounds shows appreciable cross sections for dissociative electron attachment (DEA) in the gas phase...journal article 2015
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- Orlova, E.E. (author), Hovenier, J.N. (author), Klaassen, T.O. (author), Kasalynas, I. (author), Adam, A.J.L. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Williams, B.S. (author), Kumar, S. (author), Hu, Q. (author), Reno, J.L. (author) journal article 2006
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- Zandbergen, H.W. (author), Foo, M. (author), Xu, Q. (author), Kumar, V. (author), Cava, R.J. (author) journal article 2004
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Baryshev, A. (author), Hovenier, J.N. (author), Adam, A.J.L. (author), Kaalynas, I. (author), Gao, J.R. (author), Klaassen, T.O. (author), Williams, B.S. (author), Kumar, S. (author), Hu, Q. (author), Reno, J.L. (author)We have studied the phase locking and spectral linewidth of an ? 2.7?THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8?GHz is compared with a microwave reference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in...journal article 2006
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Kumar, P. (author), Bauer, P. (author)In this paper, we develop a comprehensive model of a permanent-magnet brushless DC (BLDC) motor. An analytical model for determining instantaneous air-gap field density is developed. This instantaneous field distribution can be further used to determine the cogging torque, induced back electromotive force, and iron losses in the motor. The...journal article 2008
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Kumar, P. (author), Bauer, P. (author)This work focuses on a design methodology that aids in design and development of complex engineering systems. This design methodology consists of simulation, optimization and decision making. Within this work a framework is presented in which modelling, multi-objective optimization and multi criteria decision making techniques are used to design...journal article 2008
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Kumar, S.S. (author), Anupam, K. (author), Scarpas, A. (author), Kasbergen, C. (author)Hydroplaning speed is known to vary over a range of tire slipping conditions from free rolling to completely skidding. An attempt has been made to simulate two extreme conditions of hydroplaning i.e. when the tire is completely rolling (0% slip) and a completely locked tire (100% slip). ASTM standard smooth tire moving over the plane pavement...journal article 2012
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- Kumar, P. (author), Gospodaric, D. (author), Bauer, P. (author) journal article 2007
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Khosropanah, P. (author), Baryshev, A. (author), Zhang, W. (author), Jellema, W. (author), Hovenier, J.N. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Paveliev, D.G. (author), Williams, B.S. (author), Kumar, S. (author), Hu, Q. (author), Reno, J.L. (author), Klein, B. (author), Hesler, J.L. (author)We demonstrate the phase locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (x12) from a microwave synthesizer at ~15 GHz....journal article 2009
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Wandinger, U. (author), Freudenthaler, V. (author), Baars, H. (author), Amodeo, A. (author), Engelmann, R. (author), Mattis, I. (author), Gross, S. (author), Pappalardo, G. (author), Giunta, G. (author), D'Amico, G. (author), Chaikovsky, A. (author), Osipenko, F. (author), Slesar, A. (author), Nicolae, D. (author), Belegante, L. (author), Talianu, C. (author), Serikov, I. (author), Linne, H. (author), Jansen, F. (author), Apituley, A. (author), Wilson, K.M. (author), de Graaf, M. (author), Trickl, T. (author), Giehl, H. (author), Adam, D. (author), Comeron, A. (author), Munoz-Porcar, C. (author), Rocadenbosch, F. (author), Sicard, M. (author), Tomas, S. (author), de Lange, D. (author), Kumar, D. (author), Pujadas, M. (author), Molero, F. (author), Fernandez, A.F. (author), Alados-Arboledas, L. (author), Bravo-Aranda, J.A. (author), Navas-Guzman, F. (author), Guerrero-Rascado, J.L. (author), Granados-Munoz, M.J. (author), Preissler, J. (author), Wagner, F. (author), Gausa, M. (author), Grigorov, I. (author), Stoyanov, D. (author), Iarlori, M. (author), Rizi, V. (author), Spinelli, N. (author), Boselli, A. (author), Wang, X. (author), lo Feudo, F. (author), Perrone, M.R. (author), de Tomasi, F. (author), Burlizzi, P. (author)This paper introduces the recent European Aerosol Research Lidar Network (EARLINET) quality-assurance efforts at instrument level. Within two dedicated campaigns and five single-site intercomparison activities, 21 EARLINET systems from 18 EARLINET stations were intercompared between 2009 and 2013. A comprehensive strategy for campaign setup and...journal article 2016
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Eberhard, M. (author), Kumar, A. (author), Mignanti, S. (author), Petrocco, R. (author), Uitto, M. (author)Peer-to-Peer systems are nowadays a very popular solution for multimedia distribution, as they provide significant cost benefits compared with traditional server-client distribution. Additionally, the distribution of scalable content enables the consumption of the content in a quality suited for the available bandwidth and the capabilities of...journal article 2011
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- Kumar, Munendra (author) journal article 2008
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Ramakrishnan, G. (author), Ramanandan, G.K.P. (author), Adam, A.J.L. (author), Xu, M. (author), Kumar, N. (author), Hendrikx, R.W.A. (author), Planken, P.C.M. (author)We report on the surprisingly strong, broadband emission of coherent terahertz pulses from ultrathin layers of semiconductors such as amorphous silicon, germanium and polycrystalline cuprous oxide deposited on gold, upon illumination with femtosecond laser pulses. The strength of the emission is surprising because the materials are considered to...journal article 2013
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Wagener, T. (author), Sivapalan, M. (author), Troch, P.A. (author), McGlynn, B.L. (author), Harman, C.J. (author), Gupta, H.V. (author), Kumar, P. (author), Rao, P.S.C. (author), Basu, N.B. (author), Wilson, J.S. (author)Human activities exert global-scale impacts on our environment with significant implications for freshwater-driven services and hazards for humans and nature. Our approach to the science of hydrology needs to significantly change so that we can understand and predict these implications. Such an adjustment is a necessary prerequisite for the...journal article 2010
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- Kumar, V.S. (author) journal article 2004
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- Bhatt, V. (author), Sarkar, A. (author), Kumar, R. (author), Basu, S. (author), Agarwal, V.K. (author) journal article 2004
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Voliotis, A. (author), Bezantakos, S. (author), Giamarelou, M. (author), Valenti, M. (author), Kumar, P. (author), Biskos, G. (author)Traditional pottery manufacturing involves firing of the ceramics in kilns, a process that leads to high concentrations of airborne particles that are harmful to human health. In order to assess the associated exposure levels and the involved risks, here, for the first time, we investigate the size, the concentration and the elemental...journal article 2014
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Cohn, H. (author), Kumar, A. (author), Schürmann, A. (author)We study dimensional trends in ground states for soft-matter systems. Specifically, using a high-dimensional version of Parrinello-Rahman dynamics, we investigate the behavior of the Gaussian core model in up to eight dimensions. The results include unexpected geometric structures, with surprising anisotropy as well as formal duality relations....journal article 2009
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Konijnenberg, A.P. (author), Wei, L. (author), Kumar, N. (author), Couto Correa Pinto Filho, L. (author), Cisotto, L. (author), Pereira, S.F. (author), Urbach, H.P. (author)In several optical systems, a specific Point Spread Function (PSF) needs to be generated. This can be achieved by shaping the complex field at the pupil. The Extended Nijboer-Zernike (ENZ) theory relates complex Zernike modes on the pupil directly to functions in the focal region. In this paper, we introduce a method to engineer a PSF using the...journal article 2014