24,430 research outputs found

    Half-bridge Concepts for High Blocking Voltage GaN HEMT

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    GaN power semiconductors with lower blocking voltages are well established meanwhile in low- and mid-power applications for highly efficient power conversion. However, especially for industrial and automotive drive inverters – in a power class of 20 kW up to 30 kW – semiconductor intrinsic normally-off characteristics for higher blocking voltages than 650 V under distinct elevated reliability levels are mandatory. As well, low-inductance power module design elements down to few nH are mandatory for the higher switching frequency ability and the steeper voltage and current gradients in comparison to Silicon power devices. Therefore the partner in the EU public funded project ‘InRel-NPower’ research on new robust and reliable GaN-on-Si devices for higher blocking voltages than 650 V – with respect to DC-link voltage levels towards 800 V – and assembly and interconnection technologies for low-inductance module concepts enabling those new devices towards system level

    Jack Alive / Martin Dead : The Location of the "Author" in Jack London\u27s Martin Eden

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    This essay is an attempt to read Martin Eden, Jack Londonʼs autobiographical novel, in terms of the inextricable relationship between the author and the protagonist. Critics have often taken the unbalanced plot and the lack of ironic distance between narrator and character in Martin Eden as the technical weakness of London, but this paper argues that the achievement of this novel owes a great deal to the attachment of London to Martin. The unbalanced structure is a necessary product of the severe struggle of the author to kill his romantic alter ego. // Martin, who aspires to win Ruth Morse, tries to cross class boundaries by making a career of a writer. Even after realizing the emptiness of Ruth, who turns out to be nothing but a typical figure of the bourgeoisie, he somehow persists in loving her. The notion underlying here is that, for Martin, love, career and art are fundamentally inseparable. He objects to the aestheteʼs view of Brissenden on account of his separation of art from career. Martinʼs identity and life consist only in the triunity of love/career/art; the alternative is the repudiation of life. Thus, the unnatural delay of his disappointment in love can be regarded as Londonʼs strategy to set the suicide of Martin as the necessary consequence of the story. // By finishing the story and killing Martin, London finally detaches himself from Martin, reconstructs his self, and, unlike Martin, survives as a professional writer. In this sense, Martin Eden is a story about “writerʼs self-reconstruction.

    Robert Martin Tiffin's Mystery Man Newspaper Articles

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    Advertiser-Tribune newspaper clippings featuring a story about Robert Martin (written by Nancy Kleinhenz), a local author from Tiffin (Ohio) who wrote under the pseudonym of Lee Roberts, and two of his short stories. Martin wrote mystery novels in his spare time, creating more than 22 mystery novels. For more information about Robert Martin and a list of books go to http://www.mysteryfile.com/RMartin/JBennett.html

    Geochemical Characterization of Insoluble Particle Clusters in Ice Cores Using Two‐dimensional Impurity Imaging

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    Understanding post-depositional processes altering the layer sequence in ice cores is especially needed to avoid misinterpretation of the oldest and most highly thinned layers. The record of soluble and insoluble impurities represents an important part of the paleoclimate proxies in ice cores but is known to be affected through interaction with the ice matrix, diffusion and chemical reactions. Laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) has been recognized for its micron-scale resolution and micro-destructiveness in ice core impurity analysis. Employing LA-ICP-MS for 2D chemical imaging has already revealed a close relationship between the ice grain boundary network and impurity signals with a significant soluble component, such as Na and Mg. Here we show the latest improvements in chemical imaging with LA-ICP-MS, by increasing the spatial resolution to 20 μm and extending the simultaneous analysis to also mostly insoluble impurities, such as Al and Fe. All analytes reveal signals of dispersed spots in a sample of an East Greenland ice core. Based on their average size around 50-60 times larger than an average particle and their heterogeneous elemental ratios these spots are interpreted as particle clusters. To distinguish their origin, a simple colocalization classification reveals elemental ratios consistent with marine and mineral dust aerosol. Based on already existing data from cryo-Raman spectroscopy, we discuss potential ways to integrate the two methods in a future comparison. Such a combined approach may help constraining post-depositional changes to the dust-related insoluble impurity components, such as cluster formation and chemical reactions at grain boundaries

    Conformational And Electronic Interaction Studies Of Some P-substituted α-methylsulfonyl-α-diethoxyphosphorylacetophenones

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    The analysis of the IR carbonyl band of the α-methylsulfonyl-α-diethoxyphosphoryl p-substituted acetophenones p-Y-Ph-C(O)CH(SO2Me)[P(O)(OEt)2] (Y = OMe 1, H 2, F 3, Cl 4, Br 5 and NO2 6) supported by HF/6-31G(d,p) ab initio calculations of the α-methylsulfonyl-α-diethoxyphosphoryl acetophenone 2, indicated the existence of a single stable c1 conformer in gas phase and in solvents of increasing polarity, along with the presence of second less stable conformation in gas phase. The c1 conformer present the (SO2Me) group and the [P(O)(OEt2)] groups in a syn-clinal (gauche) geometry and is stabilised through of the Oδ-(CO)...Pδ+(PO), Oδ-[PO(OEt)]...Cδ+(CO), Oδ-(PO)...Cδ+(CO), Oδ-(CO)...Sδ+(SO2Me) and Oδ-(SO2)...Cδ+(CO) electronic interactions along with Hδ+(SO2Me).... Oδ-(CO), Hδ+(CH2)[POEt].... Oδ-(SO2Me), Hδ+(o-Ph).... Oδ-(CO) and Hδ+(o′-Ph).... Oδ-(PO) intramolecular hydrogen bonds. The almost constant negative carbonyl frequency shifts (Δν) for the title compounds 1-6 with respect to the parent acetophenones 7-14 corroborates the prevalence of the electronic interactions over the -Iσ inductive effect of the α-substituents for the title compounds and gives strong support for the existence of the crossed Oδ-(CO)...Sδ+(SO2Me) and Oδ-(SO2)...Cδ+(CO) (charge transfer and electrostatic); Oδ-(CO)...Pδ+(PO) and Oδ-[PO(OEt)]...Cδ+(CO), (electrostatic) interactions. © 2008 Elsevier B.V. All rights reserved.8921-3300304Distefano, G., Dal Colle, M., Bertolasi, V., Olivato, P.R., Bonfada, E., Mondino, M.G., (1991) J. Chem Soc., Perkin Trans., 2, p. 1195Olivato, P.R., Bonfada, E., Rittner, R., (1992) Magn. Reson. Chem., 30, p. 81Dal Colle, M., Bertolasi, V., de Palo, M., Distefano, G., Jones, D., Modelli, A., Olivato, P.R., (1995) J. Chem. Phys., 99, p. 15011Olivato, P.R., Guerrero, S.A., Rittner, R., (1997) Phosphorus Sulfur Silicon, 130, p. 155Olivato, P.R., Hui, M.LT., Rodrigues, A., Ruiz Filho, R., Rittner, R., Zukerman-Schpector, J., Distefano, G., Dal Colle, M., (2003) J. Mol. Struct., 645, p. 259Olivato, P.R., Reis, A.K.C.A., Ruiz Filho, R., Zukerman-Schpector, J., Rittner, R., (2004) J. Mol. Struct. (Theochem.), 677, p. 199Olivato, P.R., Ruiz Filho, R., Zuckerman-Schpector, J., Dal Colle, M., Distefano, G., (2001) J. Chem. Soc., Perkin Trans., 2, p. 97Jones, D., Dal Colle, M., Distefano, G., Ruiz Filho, R., Olivato, P.R., (2001) J. Organomet. Chem., 625, p. 121Olivato, P.R., Reis, A.K.C.A., Zukerman-Schpector, J., Tormena, C., Rittner, R., Domingues, N.L.C., Dal Colle, M., (2006) J. Mol. Struct., 798, p. 57Sega, E.M., Reis, A.K.C.A., Olivato, P.R., Rodrigues, A., Carvalho, J.E., Castilho, R.F., Rittner, R., Höehr, N.F., (2008) Clin. Chim. Acta, 389, p. 177Reis, A.K.C.A., Olivato, P.R., Rittner, R., (2005) Magn. Reson. Chem., 43, p. 85Galactic Industries Corporation, 1991-1998M.J. Frisch, G.W. Trucks, H.B. Schlegel, G.E. Scuseria, M.A. Robb, J.R. Cheeseman, V.G. Zakrzewski, J.A. Montgomery Jr., R.E. Stratmann, J.C. Burant, S. Dapprich, J.M. Millam, A.D. Daniels, K.N. Kudin, M.C. Strain, O. Farkas, J. Tomasi, V. Barone, M. Cossi, R. Cammi, B. Mennucci, C. Pomelli, C. Adamo, S. Clifford, J. Ochterski, G.A. Petersson, P.Y. Ayala, Q. Cui, K. Morokuma, D.K. Malick, A.D. Rabuck, K. Raghavachari, J.B. Foresman, J. Cioslowski, J.V. Ortiz, B.B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. Gomperts, R.L. Martin, D.J. Fox, T. Keith, M.A. Al-Laham, C.Y. Peng, A. Nanayakkara, C. Gonzalez, M. Challacombe, P.M.W. Gill, B. Johnson, W. Chen, M.W. Wong, J.L. Andres, M. Head-Gordon, E.S. Repogle, J.A. Pople, Gaussian 98, Revision A.6, Gaussian, Pittsburg, PA, 1998Riddick, J.A., Bunger, W.B., (1970) Techniques of Organic Chemistry, vol. II: Organic Solvents. third ed., , Wiley, New YorkMarch, J., (1985) Advanced Organic Chemistry. third ed., , Wiley, New YorkHansh, C., Leo, A., Hoekman, D., (1995) Exploring QSAR Hydrophobic, Electronic and Steric Constants, , American Chemical Society, Washington, D

    Experiences Using Large Scale Video Walls for Distance Education

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    We describe our experiences building and using the Rutgers Videowall, a low-cost telepresence system that has been used teaching 15 courses and colloquia. By relaxing typical spatial telepresence features, such as background continuity, we greatly reduced costs and gained flexibility in the rooms it could be deployed in. The lower costs and room flexibility enabled academic departments to use the wall, in contrast to traditional telepresence systems which remained inaccessible. We found that the Videowall’s spatial distortions did not have a significant impact on useability, as our initial survey results show that students had an overall positive experience.Technical report DCS-tr-72

    Hans Martin Schwarz Collection 1934 - 1938

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    This collection contains clippings of articles by Hans Martin Schwarz (1917, Hamburg – 2006, New York, better known as Martin Ebon), published between 1934 and 1938 in German-Jewish newspapers on a wide variety of subjects such as sports, emigration, the political situation in Germany, and religious attitudes of the young. It also contains reviews of his books "Einer wie Du und Ich" and "Heiteres, Besinnliches, Nachdenkliches."digitizedHans Martin Schwarz (1917, Hamburg – 2006, New York, better known as Martin Ebon), was a journalist and author. In Germany during the 1930s, he published in a variety of German-Jewish periodicals, primarily the Israelitisches Familienblatt. After immigrating to the United States in 1938, he changed his name to Martin Ebon, and published dozens of books in the areas of world affairs and parapsychology.Processe
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