Searched for: faculty:"Aerospace%5C%2BEngineering"
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document
Liu, Z-L (author)
The emission of green-house gases, such as carbon-dioxide, has been increasing rapidly in the last 50 years. Leading to an increase in the overall temperature, melting polar ice, rising sea-levels and more natural disasters. Aviation is one of the causes of these emissions. The efficiency of aircraft engines can be improved by improving the...
master thesis 2017
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Liu, L. (author)
A one-dimensional analytical solution to predict buckling-induced delamination growth was developed toward an efficient and effective engineering application. The postbuckling solution for a composite beam was first obtained with nonlinear deflection approximations based on 'thin film' assumption. An interlaminar stress analysis method was then...
master thesis 2016
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Liu, P. (author), Yao, L. (author), Groves, R.M. (author)
Optical coherence tomography (OCT) is a non-invasive imaging method, which allows the econstruction of three dimensional depth-resolved images with microscale resolution. Originally developed for biomedical diagnostics, nowadays it also shows a high potential for applications in the field of non-destructive testing (NDT). This work demonstrates...
conference paper 2015
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Dingemans, L.M. (author), Papadakis, V. (author), Liu, P. (author), Adam, A.J.L. (author), Groves, R.M. (author)
Optical coherence tomography (OCT) is a contactless and non-destructive testing (NDT) technique based on lowcoherence interferometry. It has recently become a popular NDT-tool for evaluating cultural heritage. In this study, protective coatings on wood and their penetration into the wood structure were measured with a customized infrared fiber...
conference paper 2015
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Liu, P. (author)
Optical coherence tomography (OCT) is a non-invasive, contactless and high resolution imaging method, which allows the reconstruction of two or three dimensional depth-resolved images in turbid media. In the past 20 years, OCT has been extensively developed in the field of biomedical diagnostics, while OCT in the non-destructive testing (NDT)...
doctoral thesis 2014
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Liu, Bin (author)
master thesis 2014
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Liu, P. (author), Groves, R.M. (author), Benedictus, R. (author)
Optical coherence elastography (OCE) has been applied to the study of microscopic deformation in biological tissue under compressive stress for more than a decade. In this paper, OCE has been extended for the first time, to the best of our knowledge, to deformation measurement in a glass fiber composite in the field of nondestructive testing. A...
journal article 2014
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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, 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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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, S. (author)
doctoral thesis 2012
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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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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, 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 journal article 2010
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Lindenbergh, R.C. (author), Liu, S. (author), Hanssen, R. (author), De Haan, S. (author), Van der Marel, H. (author)
High spatial resolution integrated water vapor (IWV) estimates are available from the MERIS spectrometer on board of Envisat. Unfortunately cloud cover results in loss of a large amount of MERIS IWV pixels. Here methods are presented for filling cloud gaps in MERIS IWV scenes, first, by directly interpolating remaining pixels not affected by...
conference paper 2009
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Klees, R. (author), Liu, X. (author), Wittwe, T. (author), Gunter, B.C. (author), Revtova, E.A. (author), Tenzer, R. (author), Ditmar, P. (author), Winsemius, H.C. (author), Savenije, H.H.G. (author)
When using GRACE as a tool for hydrology, many different gravity field model products are now available to the end user. The traditional spherical harmonics solutions produced from GRACE are typically obtained through an optimization of the gravity field data at the global scale, and are generated by a number of processing centers around the...
journal article 2008
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Liu, X. (author)
doctoral thesis 2008
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Ditmar, P. (author), Klees, R. (author), Liu, X. (author)
journal article 2007
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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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