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Ji, L. (author), Xu, Y. (author)In (Xu and Shu in J. Sci. Comput. 40:375–390, 2009), a local discontinuous Galerkin (LDG) method for the surface diffusion of graphs was developed and a rigorous proof for its energy stability was given. Numerical simulation results showed the optimal order of accuracy. In this subsequent paper, we concentrate on analyzing a priori error...journal article 2011
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Performance modeling and optimization of sparse matrix-vector multiplication on NVIDIA CUDA platformXu, S. (author), Xue, W. (author), Lin, H.X. (author)In this article, we discuss the performance modeling and optimization of Sparse Matrix-Vector Multiplication (SpMV) on NVIDIA GPUs using CUDA. SpMV has a very low computation-data ratio and its performance is mainly bound by the memory bandwidth. We propose optimization of SpMV based on ELLPACK from two aspects: (1) enhanced performance for the...journal article 2011
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Klimczuk, T. (author), Wang, C.H. (author), Lawrence, J.M. (author), Xu, Q. (author), Durakiewicz, T. (author), Ronning, F. (author), Llobet, A. (author), Trouw, F. (author), Kurita, N. (author), Tokiwa, Y. (author), Lee, H. (author), Booth, C.H. (author), Gardner, J.S. (author), Bauer, E.D. (author), Joyce, J.J. (author), Zandbergen, H.W. (author), Movshovich, R. (author), Cava, R.J. (author), Thompson, J.D. (author)We report extensive measurements on a new compound (Yb0.24Sn0.76)Ru that crystallizes in the cubic CsCl structure. Valence-band photoemission (PES) and L3 x-ray absorption show no divalent component in the 4f configuration of Yb. Inelastic neutron scattering (INS) indicates that the eight-fold degenerate J-multiplet of Yb3+ is split by the...journal article 2011
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Song, B. (author), Schneider, G.F. (author), Xu, Q. (author), Pandraud, G. (author), Dekker, C. (author), Zandbergen, H. (author)Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.journal article 2011
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Tirumalasetty, G.K. (author), Van Huis, M.A. (author), Fang, C.M. (author), Xu, Q. (author), Tichelaar, F.D. (author), Hanlon, D.N. (author), Sietsma, J. (author), Zandbergen, H.W. (author)Multiphase steels utilising composite strengthening may be further strengthened via grain refinement or precipitation by the addition of microalloying elements. In this study a Nb microalloyed steel comprising martensite, bainite and retained austenite has been studied. By means of transmission electron microscopy (TEM), we have investigated the...journal article 2011
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Lu, H. (author), Xu, T. (author), Nikookar, H. (author), Ligthart, L.P. (author)In this paper, we investigate the diversity, capacity and complexity issues of cooperative Zero-Padding (ZP)-Orthogonal FrequencyDivisionMultiplexing (OFDM) communication. We consider cooperative ZP-OFDM communication over a multipath Rayleigh channel and with multiple Carrier Frequency Offsets (CFOs) existing at different relays. We use a...journal article 2011
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- Xu, M.C. (author), Guedes Soares, C. (author) journal article 2012
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- Xu, M. (author), Negenborn, R.R. (author), van Overloop, P.J. (author), van de Giesen, N.C. (author) journal article 2012
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Xu, T. (author), Tang, Z. (author), Remis, R. (author), Leus, G. (author)OFDM suffers from inter-carrier interference (ICI) when the channel is time varying. This article seeks to quantify the amount of interference resulting from wideband OFDM channels, which are assumed to follow the multi-scale multi-lag (MSML) model. The MSML channel model results in full channel matrices both in the frequency and time domains....journal article 2012
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Tirumalasetty, G.K. (author), Fang, C.M. (author), Xu, Q. (author), Jansen, J. (author), Sietsma, J. (author), Van Huis, M.A. (author), Zandbergen, H.W. (author)A transmission electron microscopy study was conducted on nanoprecipitates formed in Ti microalloyed transformation-inducedplasticity-assisted steels, revealing the presence of Ti(N), Ti2CS and a novel type of ultra-fine Fe(C) precipitate. The matrix/precipitate orientation relationships, sizes and shapes were investigated in detail. The...journal article 2012
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- Xu, G.D. (author), Wu, G.X. (author) journal article 2013
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Non-conducting interfaces of LaAlO3/SrTiO3 produced in sputter deposition: The role of stoichiometryDildar, I.M. (author), Boltje, D.B. (author), Hesselberth, M.H.S. (author), Aarts, J. (author), Xu, Q. (author), Zandbergen, H.W. (author), Harkema, S. (author)We have investigated the properties of interfaces between LaAlO3 films grown on SrTiO3 substrates singly terminated by TiO2. We used RF sputtering in a high-pressure oxygen atmosphere. The films are smooth, with flat surfaces. Transmission electron microscopy shows sharp and continuous interfaces with some slight intermixing. The elemental ratio...journal article 2013
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Blossey, P.N. (author), Bretherton, C.S. (author), Zhang, M. (author), Cheng, A. (author), Endo, S. (author), Heus, T. (author), Liu, Y. (author), Lock, A.P. (author), De Roode, S.R. (author), Xu, K.M. (author)Subtropical marine low cloud sensitivity to an idealized climate change is compared in six large-eddy simulation (LES) models as part of CGILS. July cloud cover is simulated at three locations over the subtropical northeast Pacific Ocean, which are typified by cold sea surface temperatures (SSTs) under well-mixed stratocumulus, cool SSTs under...journal article 2013
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He, Z. (author), Tian, H. (author), Deng, G. (author), Xu, Q. (author), Van Tendeloo, G. (author)The microstructure of the charge/orbital ordering Ruddleden-Popper phase PrCa2Mn2O7 was studied by transmission electron microscopy along both the [001] and the [110] orientation. Three coexisting charge/orbital ordering phases CO1, CO2, and CO3 were observed along the [001] orientation at room temperature. Different from the one-dimensional...journal article 2013
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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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Rudneva, M. (author), Gao, B. (author), Prins, F. (author), Xu, Q. (author), Van der Zant, H.S.J. (author), Zandbergen, H.W. (author)In situ transmission electron microscopy was performed on the electromigration in platinum (Pt) nanowires (14 nm thick, 200 nm wide, and 300 nm long) with and without feedback control. Using the feedback control mode, symmetric electrodes are obtained and the gap usually forms at the center of the Pt nanowire. Without feedback control,...journal article 2013
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Malladi, S. (author), Shen, C. (author), Xu, Q. (author), De Kruijff, T. (author), Yücelen, E. (author), Tichelaar, F. (author), Zandbergen, H. (author)An approach to carry out chemical reactions using aggressive gases in situ in a transmission electron microscope (TEM), at ambient pressures of 1.5 bar using a windowed environmental cell, called a nanoreactor, is presented here. The nanoreactor coupled with a specially developed holder with platinum tubing permits the usage of aggressive...journal article 2013
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Zhang, M. (author), Bretherton, C.S. (author), Blossey, P.N. (author), Austin, P.H. (author), Bacmeister, J.T. (author), Bony, S. (author), Brient, F. (author), Cheedela, S.K. (author), Cheng, A. (author), Del Genio, A.D. (author), De Roode, S.R. (author), Endo, S. (author), Franklin, C.N. (author), Golaz, J.C. (author), Hannay, C. (author), Heus, T. (author), Isotta, F.A. (author), Dufresne, J.L. (author), Kang, I.S. (author), Kawai, H. (author), Köhler, M. (author), Larson, V.E. (author), Liu, Y. (author), Lock, A.P. (author), Lohmann, U. (author), Khairoutdinov, M.F. (author), Molod, A.M. (author), Neggers, R.A.J. (author), Rasch, P. (author), Sandu, I. (author), Senkbeil, R. (author), Siebesma, A.P. (author), Siegenthaler-Le Drian, C. (author), Stevens, B. (author), Suarez, M.J. (author), Xu, K.M. (author), Von Salzen, K. (author), Webb, M.J. (author), Wolf, A. (author), Zhao, M. (author)CGILS—the CFMIP-GASS Intercomparison of Large Eddy Models (LESs) and single column models (SCMs)—investigates the mechanisms of cloud feedback in SCMs and LESs under idealized climate change perturbation. This paper describes the CGILS results from 15 SCMs and 8 LES models. Three cloud regimes over the subtropical oceans are studied: shallow...journal article 2013
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- Wang, X-G (author), Zou, Z-J. (author), Xu, F. (author), Ren, R.-Y. (author) journal article 2014
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Xu, J (author), Mitra, S (author), Matsumoto, A (author), Patki, S (author), van Hoof, C (author), Makinwa, K.A.A. (author)<br/>journal article 2014