Search results for "Anisotropy"
showing 10 items of 912 documents
Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs
2021
We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline called {\tt PyStoch} on data folded over one sidereal day. We use gravitational-wave radiometry (broadband and narrow band) to produce sky maps of stochastic gravitational-wave backgrounds and to search for gravitational waves from point sources. A spherical harmonic decomposition method is employed to look for gravitational-wave emission from spatially-extended sources. Neither technique found eviden…
Guided Wave Techniques for Damage Detection in Composite Aerospace Structures
2018
Composite materials make up an increasing portion of today’s aerospace structures (see, e.g. Boeing 787 and Airbus 380). These aircrafts’ fuselage, for example, is composed of a laminated composite skin connected to composite stringers and C-frames. Of primary importance is the detection of damage in these built-up structures, whether caused by the manufacturing process or in service (e.g. impacts). A related issue is the characterization of the composite (visco)elastic mechanical properties, that can also be related to the quantification of potential damage. Guided elastic waves propagating in the ~100s kHz regime lend themselves to provide the necessary sensitivity to these two conditions…
Large‐scale lateral saturated soil hydraulic conductivity as a metric for the connectivity of subsurface flow paths at hillslope scale
2022
Lateral saturated soil hydraulic conductivity, K-s,K-l, is the soil property governing subsurface water transfer in hillslopes, and the key parameter in many numerical models simulating hydrological processes at the hillslope and catchment scales. Likewise, the hydrological connectivity of the lateral flow paths plays a significant role in determining the rate of the subsurface flow at various spatial scales. This study investigates the relationship between K-s,K-l and hydrological connectivity at the hillslope spatial scale. K-s,K-l was determined by the subsurface flow rates intercepted by drains and water table depths observed in a well network. The hydrological connectivity was evaluate…
Birefringent porous silicon membranes for optical sensing
2012
In this work anisotropic porous silicon is investigated as a material for optical sensing. Birefringence and sensitivity of the anisotropic porous silicon membranes are thoroughly studied in the framework of Bruggeman model which is extended to incorporate the influence of environment effects, such as silicon oxidation. The membranes were also characterized optically demonstrating sensitivity as high as 1245 nm/RIU at 1500 nm. This experimental value only agrees with the theory when it takes into consideration the effect of silicon oxidation. Furthermore we demonstrate that oxidized porous silicon membranes have optical parameters with long term stability. Finally, we developed a new model …
An Interface Model for the Analysis of Anisotropy of Friction and Wear of Contact Surfaces
2008
"Figure 1a" of "Azimuthal anisotropy of neutral pion production in Au+Au collisions at $\sqrt(s_NN)$ = 200 GeV: Path-length dependence of jet quenchi…
2023
Ratios of $v_2$ measured separately using MPC and RXN$_{in}$ to combine results.
"Figure 2a-1" of "Azimuthal anisotropy of neutral pion production in Au+Au collisions at $\sqrt(s_NN)$ = 200 GeV: Path-length dependence of jet quenc…
2023
$v_2$ vs $N_{part}$ and $R_{AA}$ vs $N_{part}$ in two $p_T$ ranges compared with WHDG model.
"Figure 2a-2" of "Azimuthal anisotropy of neutral pion production in Au+Au collisions at $\sqrt(s_NN)$ = 200 GeV: Path-length dependence of jet quenc…
2023
$v_2$ vs $N_{part}$ in two $p_T$ ranges and $R_{AA}$ vs $N_{part}$ in the same $p_T$ ranges.
"Figure 2a-3" of "Azimuthal anisotropy of neutral pion production in Au+Au collisions at $\sqrt(s_NN)$ = 200 GeV: Path-length dependence of jet quenc…
2023
$v_2$ vs $N_{part}$ in two $p_T$ ranges and $R_{AA}$ vs $N_{part}$ in the same $p_T$ ranges.
"Figure 2b-2a" of "Azimuthal anisotropy of neutral pion production in Au+Au collisions at $\sqrt(s_NN)$ = 200 GeV: Path-length dependence of jet quen…
2023
$R_{AA}$ vs $N_{part}$ in two $p_T$ ranges compared with various models.