Searched for: collection%3Air
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Liu, G. (author), England, S.L. (author), Frey, H.U. (author), Immel, T.J. (author), Lin, C.S. (author), Pacheco, E.E. (author), Häusler, K. (author), Doornbos, E.N. (author)
This is the first study to compare plasma depletion drifts with the ambient plasma drifts and neutral winds in the post sunset equatorial ionosphere using global-scale satellite observations. The local time and latitude variations of the drift velocities of O+ plasma depletions at 350–400?km altitude are derived from the observations of the far...
journal article 2013
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Liu, J. (author), Duan, Z. (author), Jiang, J. (author), Zhu, A.X. (author)
This study conducted a comprehensive evaluation of three satellite precipitation products (TRMM (Tropical Rainfall Measuring Mission) 3B42, CMORPH (the Climate Prediction Center (CPC)Morphing algorithm), and PERSIANN (Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks)) using data from 52 rain gauge...
journal article 2015
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Liu, M. (author), Li, D. (author), Qin, P. (author), Liu, C. (author), Wang, H. (author), Wang, F. (author)
Networks can be used to describe the interconnections among individuals, which play an important role in the spread of disease. Although the small-world effect has been found to have a significant impact on epidemics in single networks, the small-world effect on epidemics in interconnected networks has rarely been considered. Here, we study the...
journal article 2015
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Hashemi Farahani, H. (author), Ditmar, P.G. (author), Klees, R. (author), De Teixeira da Encarnacao, J.G. (author), Liu, X. (author), Zhao, Q. (author), Guo, J. (author)
The ability of satellite gravimetry data to validate global static models of the Earth’s gravity field is studied. Two types of data are considered: K-band ranging (KBR) data from the Gravity Recovery and Climate Experiment (GRACE) mission and Satellite Gravity Gradiometry (SGG) data from the GOCE (Gravity field and steady-state Ocean...
journal article 2013
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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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Wei, J. (author), Chen, Z.L. (author), Liu, Z.W. (author), Sarro, P.M. (author)
This paper presents a silicon MEMS capacitive structure to investigate a test methodology for fF-level capacitive sensors’ measurement. The device mimics a capacitive sensor with a changing intermediate layer between the electrodes. A single mask bulk micromachining process is used to fabricate the device, which has a nominal capacitance of 1.2...
journal article 2010
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Loureiro, S.M. (author), Young, D.P. (author), Cava, R.J. (author), Jin, R. (author), Liu, Y. (author), Bordet, P. (author), Qin, Y. (author), Zandbergen, H. (author), Godinho, M. (author), Núñez-Regueiro, M. (author), Batlogg, B. (author)
journal article 2001
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Liu, H. (author), Lühr, H. (author), Watanabe, S. (author), Köhler, W. (author), Henize, V. (author), Visser, P.N.A.M. (author)
Using 3 years (2002–2004), over 16,400 orbits of measurements from the accelerometer on board the CHAMP satellite, we have studied the climatology of the equatorial zonal wind in the upper thermosphere. Several main features are noticed. The most prominent one is that the solar flux significantly influences both the daytime and nighttime winds....
journal article 2006
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Liu, X.G. (author), Or, S.W. (author), Li, B. (author), Ou, Z.Q. (author), Zhang, L. (author), Zhamg, Q. (author), Geng, D.Y. (author), Yang, F. (author), Li, D. (author), Brück, E.H. (author), Zhang, Z.D. (author)
journal article 2010
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Liu, D. (author), Wang, H. (author), Van Mieghem, P. (author)
In recent years, many network perturbation techniques, such as topological perturbations and service perturbations, were employed to study and improve the robustness of complex networks. However, there is no general way to evaluate the network robustness. In this paper, we propose a global measure for a network, the reconstructability...
journal article 2010
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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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Zhou, Y.L. (author), Ma, S.Y. (author), Liu, R.S. (author), Luehr, H. (author), Doornbos, E. (author)
The controls of merging electrical field, Em, and IMF (interplanetary magnetic field) magnitude, B, on the storm-time changes in upper thermospheric mass density are statistically investigated using GRACE accelerometer observations and the OMNI data of solar wind and IMF for 35 great storms during 2002–2006. It reveals the following: (1) The...
journal article 2013
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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, J.R. (author), McKenzie, C.A. (author), Seviour, E.M. (author), Webb, R.I. (author), Blackall, L.L. (author), Saint, C.P. (author), Seviour, R.J. (author)
journal article 2001
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Liu, P. (author), Groves, R.M. (author), Benedictus, R. (author)
Based on a customized time-domain optical coherence tomography (OCT) system, a series of signal processing approaches have been designed and reviewed. To improve demodulation accuracy and image quality, demodulation approaches such as median filter, Hilbert transform, and envelope detector were investigated with simulated as well as experimental...
journal article 2013
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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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Aravind, P.V. (author), Liu, M. (author), Fan, L. (author), Promes, E.J.O. (author), Giraldo, S.Y. (author), Woudstra, T. (author)
An overview of the research activities and on-going multiple projects at Delft University of Technology aimed at the development of Gasifier–Solid Oxide Fuel Cell (SOFC) based power plants are presented. Biosyngas generated in gasifiers consists of a mixture of carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), hydrogen (H2), nitrogen ...
journal article 2013
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Liu, M. (author), Rong, B. (author), Salemink, H.W.M. (author)
journal article 2007
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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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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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