scholarly journals Modified Faraday rotation in a three-dimensional magnetophotonic opal crystal consisting of maghemite/silica composite spheres

2012 ◽  
Vol 101 (15) ◽  
pp. 151121 ◽  
Author(s):  
Shunsuke Murai ◽  
Situ Yao ◽  
Tadashi Nakamura ◽  
Takahiro Kawamoto ◽  
Koji Fujita ◽  
...  
Keyword(s):  
Faraday Rotation ◽  
Three Dimensional ◽  
Silica Composite ◽  
Opal Crystal

scholarly journals Using low-frequency pulsar observations to study the 3-D structure of the Galactic magnetic field

2017 ◽  
Vol 12 (S333) ◽  
pp. 151-156
Author(s):  
C. Sobey ◽  
Keyword(s):  
Magnetic Field ◽  
Faraday Rotation ◽  
Efficient Method ◽  
Galactic Halo ◽  
Three Dimensional ◽  
Low Frequency ◽  
Dimensional Structure ◽  
Galactic Magnetic Field ◽  
Fractional Bandwidth ◽  
Murchison Widefield Array

AbstractThe Galactic magnetic field (GMF) plays a role in many astrophysical processes and is a significant foreground to cosmological signals, such as the Epoch of Reionization (EoR), but is not yet well understood. Dispersion and Faraday rotation measurements (DMs and RMs, respectively) towards a large number of pulsars provide an efficient method to probe the three-dimensional structure of the GMF. Low-frequency polarisation observations with large fractional bandwidth can be used to measure precise DMs and RMs. This is demonstrated by a catalogue of RMs (corrected for ionospheric Faraday rotation) from the Low Frequency Array (LOFAR), with a growing complementary catalogue in the southern hemisphere from the Murchison Widefield Array (MWA). These data further our knowledge of the three-dimensional GMF, particularly towards the Galactic halo. Recently constructed or upgraded pathfinder and precursor telescopes, such as LOFAR and the MWA, have reinvigorated low-frequency science and represent progress towards the construction of the Square Kilometre Array (SKA), which will make significant advancements in studies of astrophysical magnetic fields in the future. A key science driver for the SKA-Low is to study the EoR, for which pulsar and polarisation data can provide valuable insights in terms of Galactic foreground conditions.

Simulations of Realizable Photonic Bandgap Structures with High Refractive Contrast

2001 ◽  
Vol 694 ◽  
Author(s):  
Bonnie Gersten ◽  
Jennifer Synowczynski
Keyword(s):  
Periodic Structures ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Face Centered Cubic ◽  
High Permittivity ◽  
Face Centered ◽  
Photonic Bandgap Structures ◽  
Photonic Band ◽  
Opal Crystal ◽  
Periodic Arrangement

AbstractThe transfer matrix method (TMM) software (Translight, A. Reynolds [1]) was used to evaluate the photonic band gap (PBG) properties of the periodic arrangement of high permittivity ferroelectric composite (40 wt% Ba0.45Sr0.55TiO3 /60 wt% MgO composite, εR= 80, tanδ = 0.0041 at 10 GHz) in air (or Styrofoam, εR~ 1) matrix compared to a lower permittivity material (Al2O3, εR= 11.54, tanδ = 0.00003 at 10 GHz) in air. The periodic structures investigated included a one-dimensional (1D) stack and a three-dimensional (3D) face centered cubic (FCC) opal structure. The transmission spectrum was calculated for the normalized frequency for all incident angles for each structure. The results show that the bandgaps frequency increased and the bandgap width increased with increased permittivity. The effects of orientation of defects in the opal crystal were investigated. It was found by introducing defects propagation bands were introduced. It was concluded that a full PBG is possible with the high permittivity material.

Simulations of Realizable Photonic Bandgap Structures with High Refractive Contrast

2001 ◽  
Vol 692 ◽  
Author(s):  
Bonnie Gersten ◽  
Jennifer Synowczynski
Keyword(s):  
Periodic Structures ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Face Centered Cubic ◽  
High Permittivity ◽  
Face Centered ◽  
Photonic Bandgap Structures ◽  
Photonic Band ◽  
Opal Crystal ◽  
Periodic Arrangement

AbstractThe transfer matrix method (TMM) software (Translight, A. Reynolds [1]) was used to evaluate the photonic band gap (PBG) properties of the periodic arrangement of high permittivity ferroelectric composite (40 wt% Ba0.45Sr0.55TiO3/60 wt% MgO composite, εR = 80, tanδ?= 0.0041 at 10 GHz) in air (or Styrofoam, εR ∼ 1) matrix compared to a lower permittivity material (Al2O3, εR = 11.54, tanδ?= 0.00003 at 10 GHz) in air. The periodic structures investigated included a one-dimensional (1D) stack and a three-dimensional (3D) face centered cubic (FCC) opal structure. The transmission spectrum was calculated for the normalized frequency for all incident angles for each structure. The results show that the bandgaps frequency increased and the bandgap width increased with increased permittivity. The effects of orientation of defects in the opal crystal were investigated. It was found by introducing defects propagation bands were introduced. It was concluded that a full PBG is possible with the high permittivity material.

Alginate/silica composite hydrogel as a potential morphogenetically active scaffold for three-dimensional tissue engineering

RSC Advances ◽  
2013 ◽  
Vol 3 (28) ◽  
pp. 11185 ◽  
Author(s):  
Ute Schloßmacher ◽  
Heinz C. Schröder ◽  
Xiaohong Wang ◽  
Qingling Feng ◽  
Bärbel Diehl-Seifert ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Three Dimensional ◽  
Composite Hydrogel ◽  
Silica Composite

Tough and Three-Dimensional-Printable Poly(2-methoxyethyl acrylate)–Silica Composite Elastomer with Antiplatelet Adhesion Property

2020 ◽  
Vol 12 (41) ◽  
pp. 46621-46628
Author(s):  
Fumio Asai ◽  
Takahiro Seki ◽  
Ayae Sugawara-Narutaki ◽  
Kazuhide Sato ◽  
Jérémy Odent ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Adhesion Property ◽  
Silica Composite
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