Results 41 to 50 of about 2,098,146 (304)

The reflection coefficient of a fractional reflector

Journal of Differential Equations
This paper considers the question of characterizing the behavior of waves reflected by a fractional singularity of the wave speed profile, i.e., of the form \[ c(x_1, x_2, x_3) = c_0 \left(1 + \left( \frac{x_1}{\ell}\right)_{+}^α\right)^{-1/2}, \] for $α> 0$ not necessarily integer.
Laurent Demanet, Olivier Lafitte
openaire   +2 more sources

Neurochemical Endpoints to Inform Early‐Stage Trials of Spinocerebellar Ataxia 2 and 3 in a Multisite Setting

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Neurochemical levels measured by brain MR spectroscopy (MRS) have been proposed as endpoints for clinical trials in early‐stage spinocerebellar ataxia (SCA) trials. We tested their trial‐readiness by quantifying neurochemicals in three affected brain regions in early‐stage cohorts of SCA2 and SCA3, examining their reproducibility in ...
James M. Joers, Yaqiao Wei, Dinesh K. Deelchand, Adam Berrington, Young Woo Park, Guita Banan, Michal Povazan, Jens T. Rosenberg, André J. W. van der Kouwe, Tetsuo Ashizawa, Khalaf O. Bushara, Chiadi U. Onyike, Sub H. Subramony, Jeremy D. Schmahmann, Brian J. Soher, Peter B. Barker, Thomas H. Mareci, Eva‐Maria Ratai, Lynn E. Eberly, Gülin Öz   +19 more
wiley   +1 more source

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

Reflection coefficient for two elastic layers joining two homogeneous materials

Archives of Acoustics, 2015
Two homogeneous elastic layers are situated between two homogeneous elastic materials. The reflection coefficient for the harmonic wave depends on the elastic constants of the layers and the frequency.
Z. WESOŁOWSKI
doaj  

JCTR Bulletin 4th Quarter 2016 [PDF]

, 2016
In the last issue we acknowledge the violence in the August general elections. Zambia has continued to experience pockets of post-election political violence amongst supporters of different political parties.
Jesuit Centre for Theological Reflection
core  

Global Rather Than Vertical‐Selective Saccadic Abnormalities in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To test whether vertical saccades are preferentially affected in Progressive Supranuclear Palsy (PSP). Methods PSP patients (n = 24) were compared to age‐matched controls (n = 94) and two degenerative groups (Alzheimer's disease, n = 20; Lewy body disease, n = 50).
Duy Duan Nguyen, Mark Paine, Soohyun Lee, Amir Fazlollahi, Baibin (Ben) Wang, John D. O'Sullivan, Peter J. Nestor   +6 more
wiley   +1 more source

Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
The stability criteria affecting the formation of high‐entropy alloys, particularly focusing in supersaturated solid solutions produced by mechanical alloying, are analyzed. Criteria based on Hume–Rothery rules are distinguished from those derived from thermodynamic relations. The formers are generally applicable to mechanically alloyed samples.
Javier S. Blázquez, Alejandro F. Manchón‐Gordón, Antonio Vidal‐Crespo, Rafael Caballero‐Flores, Jhon J. Ipus, Clara F. Conde   +5 more
wiley   +1 more source

Non-uniform Superstrate Resonant Cavity Antenna Design

四川大学学报. 自然科学版, 2018
A novel non-uniform superstrate resonant cavity antenna (RCA) design method was proposed. The non-uniform superstrate was constructed by changing the reflection coefficient at different location of the aperture.
FENG Pan, CHEN Xing, ZHOU Yong-Hong, XU Ke   +3 more
doaj  

Numerical and Experimental Study on the Wave-Attenuation Effect According to the Height of a Two-Row Submerged Rectangular Structure

한국해양공학회지
Coastal erosion, exacerbated by climate change and coastal development, presents increasing challenges for shoreline protection. This study investigates the effectiveness of submerged structures, specifically underwater breakwaters, in mitigating wave ...
Seonghee Yu, Sanghun Lee, Sanghwan Heo, Weoncheol Koo   +3 more
doaj   +1 more source

Quantitative Strata Calibration Method Based on the Reflection Coefficient Proportions

CT Lilun yu yingyong yanjiu
Strata calibration is the foundation of stratigraphic interpretation and reservoir analysis. Currently used calibration methods qualitatively compare geological interfaces with wave peaks, troughs, and other features, thus emphasizing the depth-time ...
Xing MU, Tao MENG, Haoran YANG, Jianguo SONG   +3 more
doaj   +1 more source