scholarly journals Three-dimensional ray-tracing for very low latitude whistlers, taking into account the latitudinal and longitudinal gradients of the ionosphere

2000 ◽  
Vol 105 (A8) ◽  
pp. 18895-18900 ◽  
Author(s):  
Kenji Ohta ◽  
Masashi Hayakawa
Keyword(s):  
Ray Tracing ◽  
Three Dimensional ◽  
Low Latitude ◽  
Longitudinal Gradients

Study of propagation characteristics of very low latitude whistlers by means of three-dimensional ray-tracing computations

1997 ◽  
Vol 102 (A4) ◽  
pp. 7537-7546 ◽  
Author(s):  
Kenji Ohta ◽  
Yasuhiro Nishimura ◽  
Tomomi Kitagawa ◽  
Masashi Hayakawa
Keyword(s):  
Ray Tracing ◽  
Three Dimensional ◽  
Propagation Characteristics ◽  
Low Latitude

scholarly journals Three-Dimensional Whistler Ray Tracing with Considering the Latitudinal and Longitudinal Gradients of the Ionosphere

1999 ◽  
Vol 119 (1) ◽  
pp. 77-82
Author(s):  
Hiroshi Kanzaki ◽  
Kazuyuki Makita ◽  
Akihiro Tanaka ◽  
Kenji Ohta ◽  
Masashi Hayakawa
Keyword(s):  
Ray Tracing ◽  
Three Dimensional ◽  
Longitudinal Gradients

Assessment of troposphere mapping functions using three-dimensional ray-tracing

GPS Solutions ◽  
2013 ◽  
Vol 18 (3) ◽  
pp. 345-354 ◽  
Author(s):  
Landon Urquhart ◽  
Felipe G. Nievinski ◽  
Marcelo C. Santos
Keyword(s):  
Ray Tracing ◽  
Three Dimensional ◽  
Mapping Functions

Methods to Accelerate Ray Tracing in the Monte Carlo Method for Surface-to-Surface Radiation Transport

2006 ◽  
Vol 128 (9) ◽  
pp. 945-952 ◽  
Author(s):  
Sandip Mazumder
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Radiation Transport ◽  
Three Dimensional ◽  
Intersection Point ◽  
Surface Radiation ◽  
Computational Domain ◽  
Two Dimensional ◽  
Spatial Partitioning ◽  
The Monte Carlo Method

Two different algorithms to accelerate ray tracing in surface-to-surface radiation Monte Carlo calculations are investigated. The first algorithm is the well-known binary spatial partitioning (BSP) algorithm, which recursively bisects the computational domain into a set of hierarchically linked boxes that are then made use of to narrow down the number of ray-surface intersection calculations. The second algorithm is the volume-by-volume advancement (VVA) algorithm. This algorithm is new and employs the volumetric mesh to advance the ray through the computational domain until a legitimate intersection point is found. The algorithms are tested for two classical problems, namely an open box, and a box in a box, in both two-dimensional (2D) and three-dimensional (3D) geometries with various mesh sizes. Both algorithms are found to result in orders of magnitude gains in computational efficiency over direct calculations that do not employ any acceleration strategy. For three-dimensional geometries, the VVA algorithm is found to be clearly superior to BSP, particularly for cases with obstructions within the computational domain. For two-dimensional geometries, the VVA algorithm is found to be superior to the BSP algorithm only when obstructions are present and are densely packed.

Acoustical Design Study on Application of Absorption Materials

2014 ◽  
Vol 711 ◽  
pp. 546-549
Author(s):  
Wei Lin ◽  
Wei Hwa Chiang
Keyword(s):  
Computer Simulation ◽  
Energy Distribution ◽  
Ray Tracing ◽  
Impulse Response ◽  
Background Noise ◽  
Three Dimensional ◽  
Design Phase ◽  
Design Study ◽  
Sound Energy ◽  
Reinforcement System

Taipei Top Church Auditorium is a hall primarily intended for praise and worship. A three dimensional ray tracing computer simulation was used to provide sound energy distribution on the audience area of the hall, realistic design have been performed. The volume of the hall is 24600m3, which is occupied for 2200 people and equipped the hall with acoustical curtains by modifying its acoustical characteristics. Objective measurements of impulse response are reported, and background noise control and noise isolation are also be considered in the design phase. Reinforcement system is conducted to meet all the activity for the acoustical environments.

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