scholarly journals Analysis of Raindrop Shapes and Scattering Calculations: The Outer Rain Bands of Tropical Depression Nate

Atmosphere ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 114 ◽  
Author(s):  
Merhala Thurai ◽  
Sophie Steger ◽  
Franz Teschl ◽  
Michael Schönhuber
Keyword(s):  
Gulf Coast ◽  
Scattering Matrix ◽  
Radar Data ◽  
Tropical Storm ◽  
Matrix Elements ◽  
Tropical Depression ◽  
Warm Rain ◽  
The Us ◽  
Scattering Matrix Elements ◽  
Differential Reflectivity

Tropical storm Nate, which was a powerful hurricane prior to landfall along the US Gulf coast, traversed north and weakened considerably to a tropical depression as it moved near an instrumented site in Hunstville, AL. The outer rain bands lasted 18 h (03:00 to 21:00 UTC on 08 October 2017) and a 2D-video disdrometer (2DVD) captured the event which was shallow at times and indicative of pure warm rain processes. The 2DVD measurements are used for 3D reconstruction of drop shapes (including the rotationally asymmetric drops) and the drop-by-drop scattering matrix has been computed using Computer Simulation Technology integral equation solver for drop sizes >2.5 mm. From the scattering matrix elements, the polarimetric radar observables are simulated by integrating over 1 min consecutive segments of the event. These simulated values are compared with dual-polarized C-band radar data located at 15 km range from the 2DVD site to evaluate the contribution of the asymmetric drop shapes, specifically to differential reflectivity. The drop fall velocities and drop horizontal velocities in terms of magnitude and direction, all being derived from each drop image from two orthogonal cameras of the 2DVD, are also considered.

scholarly journals Analysis of Raindrop Shapes, Fall Velocities, and Scattering Calculations during Tropical Storm Nate

2019 ◽  
Author(s):  
Merhala Thurai ◽  
Sophie Steger ◽  
Franz Teschl ◽  
Michael Schoenhuber
Keyword(s):  
Integral Equation ◽  
Computer Simulation ◽  
Scattering Matrix ◽  
Radar Data ◽  
Tropical Storm ◽  
Polarimetric Radar ◽  
Matrix Elements ◽  
Warm Rain ◽  
Raindrop Size ◽  
Scattering Matrix Elements

Tropical storm Nate, which was a powerful hurricane prior to landfall along the Alabama coast, traversed north towards our instrumented site in Hunstville, AL. The rain bands lasted 18 h and the 2D-video disdrometer (2DVD) captured the event which was shallow and indicative of pure warm rain processes. Measurements of raindrop size, shape and velocity distributions are quite rare in pure warm rain and are expected to differ from cold rain processes. In particular, asymmetric shapes due to drop oscillations and their impact on polarimetric radar signatures in warm rain have not been studied so far. Recently, the 2DVD data has been used for 3D reconstruction of asymmetric raindrop shapes but their fraction (relative to the more common oblate shapes) in warm rain has yet to be ascertained. Here we compute the scattering matrix drop-by-drop using Computer Simulation Technology integral equation solver for drop sizes>2.5 mm. From the scattering matrix elements, the polarimetric radar observables are simulated by integrating over 1 minute consecutive segments of the event. These simulated values are compared with dual-polarized C-band radar data located at 15 km range from the 2DVD site to evaluate the contribution of the asymmetric drop shapes.

scholarly journals FROM ANDERSON LOCALIZATION TO MESOSCOPIC PHYSICS

2010 ◽  
Vol 24 (12n13) ◽  
pp. 1555-1576 ◽  
Author(s):  
Markus Büttiker ◽  
Michael Moskalets
Keyword(s):  
Electron Transport ◽  
Anderson Localization ◽  
Transport Phenomena ◽  
Scattering Matrix ◽  
Scaling Theory ◽  
Single Electron ◽  
Mesoscopic Physics ◽  
Matrix Elements ◽  
Electron Interference ◽  
Scattering Matrix Elements

In the late seventies an increasing interest in the scaling theory of Anderson localization led to new efforts to understand the conductance of systems which scatter electrons elastically. The conductance and its relation to the scattering matrix emerged as an important subject. This, coupled with the desire to find explicit manifestations of single electron interference, led to the emergence of mesoscopic physics. We review electron transport phenomena which can be expressed elegantly in terms of the scattering matrix. Of particular interest are phenomena which depend not only on transmission probabilities but on both amplitude and phase of scattering matrix elements.

scholarly journals Scattering matrix elements of biological particles measured in a flow through system: theory and practice

1989 ◽  
Vol 28 (10) ◽  
pp. 1752 ◽  
Author(s):  
Peter M. A. Sloot ◽  
Alfons G. Hoekstra ◽  
Hans van der Liet ◽  
Carl G. Figdor
Keyword(s):  
System Theory ◽  
Scattering Matrix ◽  
Theory And Practice ◽  
Matrix Elements ◽  
Biological Particles ◽  
Flow Through ◽  
Scattering Matrix Elements

scholarly journals OSCILLATIONS OF FASTER THAN LIGHT MAJORANA NEUTRINOS: A CAUSAL FIELD THEORY

2001 ◽  
Vol 16 (33) ◽  
pp. 2129-2141 ◽  
Author(s):  
NGEE-PONG CHANG
Keyword(s):  
Field Theory ◽  
Canonical Quantization ◽  
Scattering Matrix ◽  
Majorana Neutrino ◽  
Matrix Elements ◽  
Majorana Neutrinos ◽  
Scattering Matrix Elements ◽  
Faster Than Light

In this paper, we carry out the canonical quantization of the field theory of an interacting tachyonic Majorana neutrino. We show how micro-causality is preserved in the physical scattering matrix elements between the in and out vacua. The phenomenology of this radical proposal is nevertheless compatible with normal timelike oscillations.

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