Integrated analysis of seismic normal incidence and wide-angle reflection measurements across the eastern Swiss Alps

1991 ◽  
pp. 195-205 ◽  
Author(s):  
J Ansorge ◽  
K Holliger ◽  
P. Valasek ◽  
S. Ye ◽  
P. Finckh ◽  
...  
Keyword(s):  
Normal Incidence ◽  
Swiss Alps ◽  
Integrated Analysis ◽  
Wide Angle

Silicon based core-shell silicon nanowires for broadband and wide angle antireflection

2013 ◽  
Vol 1510 ◽  
Author(s):  
P. Pignalosa ◽  
H. Lee ◽  
W. Guo ◽  
X. Duan ◽  
Y. Yi
Keyword(s):  
Silicon Nanowires ◽  
Solar Spectrum ◽  
Normal Incidence ◽  
Index Structure ◽  
Core Shell ◽  
Wide Angle ◽  
Si Nanowires ◽  
Graded Index ◽  
Wide Range ◽  
Silicon Based

ABSTRACTAntireflection with broadband and wide angle properties is important for a wide range of applications on photovoltaic cells and display. The SiOx shell layer provides a natural antireflection from air to the Si core absorption layer. In this work, we have demonstrated the random core-shell silicon nanowires with both broadband (from 400nm to 900nm) and wide angle (from normal incidence to 60°) antireflection characteristics within AM1.5 solar spectrum. The graded index structure from the randomly oriented core-shell (Air/SiOx/Si) nanowires may provide a potential avenue to realize a broadband and wide angle antireflection layer.

Coincident normal-incidence and wide-angle reflections from the Moho: evidence for crustal seismic anisotropy

1996 ◽  
Vol 264 (1-4) ◽  
pp. 205-217 ◽  
Author(s):  
K.A. Jones ◽  
M.R. Warner ◽  
R.P.Ll. Morgan ◽  
J.V. Morgan ◽  
P.J. Barton ◽  
...  
Keyword(s):  
Seismic Anisotropy ◽  
Normal Incidence ◽  
Wide Angle

Frequency-tunable wide-angle polarization selection with a graphene-based anisotropic epsilon-near-zero metamaterial

2021 ◽  
Author(s):  
Feng Wu ◽  
Dejun Liu ◽  
Xiaohu Wu ◽  
Hong-ju Li ◽  
Shuyuan Xiao
Keyword(s):  
Data Storage ◽  
High Performance ◽  
Liquid Crystal Display ◽  
Normal Incidence ◽  
Optical Data Storage ◽  
Optical Data ◽  
Angular Width ◽  
Wide Angle ◽  
Frequency Tunable ◽  
Epsilon Near Zero

Abstract In this paper, we achieve frequency-tunable wide-angle polarization selection based on an anisotropic epsilon-near-zero (AENZ) metamaterial mimicked by a subwavelength graphene/SiO2 multilayer. The physical mechanism of wide-angle polarization selection can be explained by the analysis of the iso-frequency curve (IFC). Under transverse electric polarization, only the incident lights which are close to normal incidence can transmit through the designed multilayer since the IFC of the AENZ metamaterial is an extremely small circle. However, under transverse magnetic polarization, all the incident lights can transmit through the designed multilayer since the IFC of the AENZ metamaterial is a flat ellipse. Therefore, polarization selection can work in a broad angular width. By changing the gate voltage applying to the graphene, the operating frequency of polarization selection can be flexibly tuned. The optimal operating angular width of high-performance polarization selection where the polarization selection ratio is larger than 102 reaches 54.9 degrees. This frequency-tunable wide-angle polarization selector would possess potential applications in liquid crystal display, read-write magneto-optical data storage, Q-switched lasing, and chiral molecule detection.

A first coincident normal-incidence and wide-angle approach to studying the extending Aegean crust

1997 ◽  
Vol 270 (3-4) ◽  
pp. 301-312 ◽  
Author(s):  
M. Sachpazi ◽  
A. Hirn ◽  
A. Nercessian ◽  
F. Avedik ◽  
J. Mc Bride ◽  
...  
Keyword(s):  
Normal Incidence ◽  
Wide Angle

The deconvolution of phase‐shifted wavelets

Geophysics ◽  
1982 ◽  
Vol 47 (9) ◽  
pp. 1285-1294 ◽  
Author(s):  
S. Levy ◽  
D. W. Oldenburg
Keyword(s):  
Plane Waves ◽  
Normal Incidence ◽  
Inverse Theory ◽  
Wide Angle ◽  
Reflectivity Function

The assumption that a seismogram can be represented as a convolution of a source wavelet with a set of real impulses breaks down when the wavelet is phase shifted upon reflection from a boundary. For plane waves and plane layers, this effect occurs only for wide‐angle supercritical reflections, but it may also occur in normal incidence seismograms when either the impinging wavefront or the reflective boundary is curved. We show that seismograms containing time‐displaced, phase‐shifted replications of the source wavelet can be deconvolved to recover both the amplitude and phase of the reflectivity coefficients. The method begins by writing the analytic seismogram as the convolution of a complex reflectivity function with an analytic source wavelet; linear inverse theory is then used to carry out the deconvolution.

scholarly journals Crystallographic analysis of temperate ice on Rhonegletscher, Swiss Alps

2021 ◽  
Vol 15 (2) ◽  
pp. 677-694
Author(s):  
Sebastian Hellmann ◽  
Johanna Kerch ◽  
Ilka Weikusat ◽  
Andreas Bauder ◽  
Melchior Grab ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Compressive Stress ◽  
Flow Direction ◽  
Swiss Alps ◽  
Integrated Analysis ◽  
Polar Regions ◽  
Large Area ◽  
Axis Orientation ◽  
Glacier Flow ◽  
The Individual

Abstract. Crystal orientation fabric (COF) analysis provides information about the c-axis orientation of ice grains and the associated anisotropy and microstructural information about deformation and recrystallisation processes within the glacier. This information can be used to introduce modules that fully describe the microstructural anisotropy or at least direction-dependent enhancement factors for glacier modelling. The COF was studied at an ice core that was obtained from the temperate Rhonegletscher, located in the central Swiss Alps. Seven samples, extracted at depths between 2 and 79 m, were analysed with an automatic fabric analyser. The COF analysis revealed conspicuous four-maxima patterns of the c-axis orientations at all depths. Additional data, such as microstructural images, produced during the ice sample preparation process, were considered to interpret these patterns. Furthermore, repeated high-precision global navigation satellite system (GNSS) surveying allowed the local glacier flow direction to be determined. The relative movements of the individual surveying points indicated longitudinal compressive stresses parallel to the glacier flow. Finally, numerical modelling of the ice flow permitted estimation of the local stress distribution. An integrated analysis of all the data sets provided indications and suggestions for the development of the four-maxima patterns. The centroid of the four-maxima patterns of the individual core samples and the coinciding maximum eigenvector approximately align with the compressive stress directions obtained from numerical modelling with an exception for the deepest sample. The clustering of the c axes in four maxima surrounding the predominant compressive stress direction is most likely the result of a fast migration recrystallisation. This interpretation is supported by air bubble analysis of large-area scanning macroscope (LASM) images. Our results indicate that COF studies, which have so far predominantly been performed on cold ice samples from the polar regions, can also provide valuable insights into the stress and strain rate distribution within temperate glaciers.

The nature of crustal boundaries: combined interpretation of wide-angle and normal-incidence seismic data

1994 ◽  
Vol 232 (1-4) ◽  
pp. 309-318 ◽  
Author(s):  
Roger E. Long ◽  
Patricia A. Matthews ◽  
Daniel P. Graham
Keyword(s):  
Seismic Data ◽  
Normal Incidence ◽  
Wide Angle
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