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Siemes, C. (author), Ditmar, P. (author), Riva, E.M. (author), Slobbe, D.C. (author), Liu, X.L. (author), Farahani, H. (author)The Gravity Recovery and Climate Experiment (GRACE) satellite mission measures the Earth’s gravity field since March 2002. We propose a new filtering procedure for post-processing GRACE-based monthly gravity field solutions provided in the form of spherical harmonic coefficients. The procedure is tuned for the optimal estimation of linear trends...journal article 2012
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- Liu, Yuming (author) journal article 2012
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- Liu, H. (author) journal article 2012
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- Zhang, Su-xia (author), Tang, You-gang (author), Liu, Xi-jun (author) journal article 2012
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Redi, J.A. (author), Liu, H. (author), Zunino, R. (author), Heynderickx, I.E.J.R. (author)Several attempts to integrate visual saliency information in quality metrics are described in literature, albeit with contradictory results. The way saliency is integrated in quality metrics should reflect the mechanisms underlying the interaction between image quality assessment and visual attention. This interaction is actually two-fold: (1)...journal article 2011
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Liu, H. (author), Redi, J.A. (author), Alers, H. (author), Zunino, R. (author), Heynderickx, I.E.J.R. (author)Reliably assessing overall quality of JPEG/JPEG2000 coded images without having the original image as a reference is still challenging, mainly due to our limited understanding of how humans combine the various perceived artifacts to an overall quality judgment. A known approach to avoid the explicit simulation of human assessment of overall...journal article 2011
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Liu, M. (author), Millan-Agorio, M.G. (author), Aravind, P.V. (author), Brandon, N.P. (author)This paper presents the influence of operation conditions including steam levels, current density and operating time on the performance of Solid Oxide Fuel Cells (SOFCs) fuelled by tar- containing biosyngas. The performance of SOFCs was evaluated by means of recording impedance spectra and polarization curves of the cells before and after tar...journal article 2011
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Liu, H. (author), Heynderickx, I. (author)Developing an objective metric, which automatically quantifies perceived image quality degradation induced by blur, is highly beneficial for current digital imaging systems. In many applications, these objective metrics need to be of the noreference (NR) type, which implies that quality prediction is based on the distorted image only. Recent...journal article 2011
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Liu, H. (author), Yamamoto, M. (author), Tulasi Ram, S. (author), Tsugawa, T. (author), Otsuka, Y. (author), Stolle, C. (author), Doornbos, E. (author), Yumoto, K. (author), Nagatsuma, T. (author)Using ground observations of total electron content (TEC) and equatorial electrojet (EEJ) in the Asian sector, along with plasma and neutral densities obtained from the CHAMP satellite, we investigate the ionospheric electrodynamics and neutral background in this longitude sector during the major stratospheric sudden warming (SSW) in January...journal article 2011
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Van Mieghem, P. (author), Stevanovi?, D. (author), Kuipers, F. (author), Li, C. (author), Van de Bovenkamp, R. (author), Liu, D. (author), Wang, H. (author)The decrease of the spectral radius, an important characterizer of network dynamics, by removing links is investigated. The minimization of the spectral radius by removing m links is shown to be an NP-complete problem, which suggests considering heuristic strategies. Several greedy strategies are compared, and several bounds on the decrease of...journal article 2011
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Liu, H. (author), Doornbos, E.N. (author), Yamamoto, M. (author), Ram, S.T. (author)Thermospheric density simultaneously observed by the CHAMP and GRACE satellites in both the pre?dawn and afternoon local time sectors undergoes significant decrease across both hemispheres during the major stratospheric sudden warming (SSW) in January 2009. This decrease is largest in the equatorial region near the subsolar latitude, reaching ...journal article 2011
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- Liu, M. (author), Millan, M.G. (author), Aravind, P.V. (author), Brandon, N. (author) journal article 2011
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- Liu, Shukui (author) journal article 2011
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- Liu, Yuming (author) journal article 2011
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- Liu, Y.N. (author), Molin, B. (author), Kimmoun, O. (author), Rouault, M.-C. (author) journal article 2011
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- Liu, Shukui (author), Papanikolaou, Apostolos (author), Zaraphonitis, George (author) journal article 2011
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- Van Mieghem, P.F.A. (author), Stevanovic, D (author), Kuipers, F.A. (author), Li, C. (author), van de Bovenkamp, R. (author), Liu, D. (author), Wang, H. (author) journal article 2011
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- Liu, X.L. (author), Ditmar, P.G. (author), Siemes, C. (author), Slobbe, D.C. (author), Revtova, E. (author), Klees, R. (author), Riva, R. (author), Zhao, Q. (author) journal article 2010
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Liu, R. (author), Lühr, H. (author), Doornbos, E. (author), Ma, S.Y. (author)With the help of four years (2002–2005) of CHAMP accelerometer data we have investigated the dependence of low and mid latitude thermospheric density on the merging electric field, Em, during major magnetic storms. Altogether 30 intensive storm events (Dstmin <?100 nT) are chosen for a statistical study. In order to achieve a good correlation Em...journal article 2010
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Holstege, H. (author), Van Beers, E. (author), Velds, A. (author), Liu, X. (author), Joosse, S.A. (author), Klarenbeek, S. (author), Schut, E. (author), Kerkhoven, R. (author), Klijn, C.N. (author), Wessels, L.F.A. (author), Nederlof, P.M. (author), Jonkers, J. (author)Background: Genomic gains and losses are a result of genomic instability in many types of cancers. BRCA1- and BRCA2-mutated breast cancers are associated with increased amounts of chromosomal aberrations, presumably due their functions in genome repair. Some of these genomic aberrations may harbor genes whose absence or overexpression may give...journal article 2010