ELT-HIRES the high-resolution spectrograph for the ELT: simulation results of polarimetric aberrations for the polarimetric module

2019 ◽  
Author(s):  
Igor Di Varano ◽  
Shu Yuan ◽  
Manfred Woche ◽  
Klaus G. Strassmeier ◽  
Michael Weber
Keyword(s):  
High Resolution ◽  
Simulation Results

Complex Angle Measuring Method of Passive-Radar-Seeker

2011 ◽  
Vol 55-57 ◽  
pp. 272-275 ◽  
Author(s):  
Chun Na Zhao ◽  
Chang Di Shi ◽  
Yu Zhao ◽  
Yi Liu
Keyword(s):  
High Resolution ◽  
Measuring Method ◽  
Spatial Spectrum ◽  
Passive Radar ◽  
Spectrum Estimation ◽  
Angle Measuring ◽  
Simulation Results ◽  
Spatial Spectrum Estimation

To overcome the shortcomings of the traditional passive-radar-seeker(PRS) for anti-decoy, a complex angle measuring method is proposed in this letter. The complex angle measuring method consists of monopulse angle and spatial spectrum estimation, two angle-measuring units. PRS can get the angle high-resolution features through the complex angle measuring method. So it is possible that PRS confronts decoy. Finally, the simulation results verify the feasibility and anti-decoy capacity of the complex angle-measuring method.

High-resolution x-ray topography of dislocations in 4H-SiC epilayers

2007 ◽  
Vol 22 (4) ◽  
pp. 845-849 ◽  
Author(s):  
Isaho Kamata ◽  
Hidekazu Tsuchida ◽  
William M. Vetter ◽  
Michael Dudley
Keyword(s):  
Computer Simulation ◽  
High Resolution ◽  
Edge Dislocation ◽  
Screw Dislocations ◽  
Burgers Vector ◽  
X Ray ◽  
Topographic Features ◽  
Different Shapes ◽  
Vector Direction ◽  
Simulation Results

Synchrotron x-ray topography with a high-resolution setup using 1128 reflection was carried out on 4H-SiC epilayers. Four different shapes of threading-edge dislocation according to Burgers vector direction were observed. The four types of threading-edge dislocation images were calculated by computer simulation, and the experimental results correlated well with the simulation results. The detailed topographic features generated by plural screw dislocations and basal plane dislocations were also investigated.

scholarly journals 2D Relativistic MHD Simulations of PWNe: Preliminary Results

2004 ◽  
Vol 218 ◽  
pp. 179-180
Author(s):  
Elena Amato ◽  
Luca Del Zanna ◽  
Niccolò Bucciantini
Keyword(s):  
High Resolution ◽  
Wind Energy ◽  
Energy Distribution ◽  
Equatorial Plane ◽  
Detailed Comparison ◽  
X Ray ◽  
Preliminary Results ◽  
Mhd Simulations ◽  
X Ray Imaging ◽  
Simulation Results

We present preliminary results of 2D axisymmetric relativistic MHD simulations of PWNe, aimed at investigating whether structures such as the rings and jets revealed by high resolution X-ray imaging can be due to anisotropy of the outflow from the pulsar. We confirm that these features can qualitatively be explained when the energy flux is larger in the equatorial plane than along the spin axis. Detailed comparison between simulation results and observations is required to constrain the wind energy distribution upstream of the termination shock.

Dynamical Research on a Micro-Displacement Actuator Based on V-Type Guide-Way

2011 ◽  
Vol 305 ◽  
pp. 330-334
Author(s):  
Ji Jie Ma ◽  
Jian Ming Wen ◽  
Ping Zeng ◽  
Jun Wu Kan ◽  
Zhong Hua Zhang
Keyword(s):  
High Resolution ◽  
Electrical Signal ◽  
Loading Capacity ◽  
Kinetic Simulation ◽  
Working Mechanism ◽  
Dynamic Formulation ◽  
Simulation And Experiment ◽  
New Type ◽  
Simulation Results ◽  
Inertial Actuator

A new type of the micro-displacement device based on V-shaped groove by using piezoelectric stack as the driver was presented. The performance characteristic of the driving device was introduced and its working mechanism was discussed. the dynamic formulation of inertial actuator is established, by using matlab software, the kinetic simulation of the actuator is carried out, the structure of newly inertial actuator is designed and manufactured. The simulation and experiment of the actuator is conducted. The simulation results agree well with the experimental results indicates that the simple associated symmetry electrical signal can provide stable stepping movement, the speed of 0.5mm/s, high resolution of 1μm, maximum loading capacity of 600g.

scholarly journals Brief Communication: Initializing RAMMS with High Resolution LiDAR Data for Avalanche Simulations

2021 ◽  
Author(s):  
James Dillon ◽  
Kevin Hammonds
Keyword(s):  
High Resolution ◽  
Snow Depth ◽  
Software Tool ◽  
Lidar Data ◽  
Mass Movements ◽  
Flow Volume ◽  
Vegetative Cover ◽  
Avalanche Forecasting ◽  
Simulation Results ◽  
Rapid Mass

Abstract. The Rapid Mass Movements Simulator (RAMMS) is an avalanche dynamics software tool for research and forecasting. Since the model’s conception, the sensitivity of inputs on simulation results has been well-documented. Here, we introduce a new method for initializing RAMMS that can be easily operationalized for avalanche forecasting using high resolution LiDAR data. As a demonstration, hypothetical avalanche simulations were performed while incrementally incorporating semi-automated LiDAR-derived values for snow depth, interface topography, and vegetative cover from field-collected LiDAR data. Results show considerable variation in the calculated runout extent, flow volume, pressure, and velocity of the simulated avalanches when incorporating these LiDAR-derived values.

scholarly journals Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession

2017 ◽  
Vol 64 (243) ◽  
pp. 49-60 ◽  
Author(s):  
CAROLINE AUBRY-WAKE ◽  
DORIAN ZÉPHIR ◽  
MICHEL BARAER ◽  
JEFFREY M. McKENZIE ◽  
BRYAN G. MARK
Keyword(s):  
High Resolution ◽  
Radiation Budget ◽  
Net Radiation ◽  
Tropical Glaciers ◽  
Exposed Rock ◽  
Glacier Melt ◽  
Physically Based ◽  
Simulation Results ◽  
Thermal Infrared Imagery ◽  
Longwave Flux

ABSTRACTTropical glaciers constitute an important source of water for downstream populations. However, our understanding of glacial melt processes is still limited. One observed process that has not yet been quantified for tropical glaciers is the enhanced melt caused by the longwave emission transfer. Here, we use high-resolution surface temperatures obtained from the thermal infrared imagery of the Cuchillacocha Glacier, in the Cordillera Blanca, Peru in June 2014 to calculate a margin longwave flux. This longwave flux, reaching the glacier margin from the adjacent exposed rock, varies between 81 and 120 W m−2 daily. This flux is incorporated into a physically-based melt model to assess the net radiation budget at the modeled glacier margin. The simulation results show an increase in the energy available for melt by an average of 106 W m−2 during the day when compared with the simulation where the LWmargin flux is not accounted for. This value represents an increase in ablation of ~1.7 m at the glacier margin for the duration of the dry season. This study suggests that including the quantification of the glacier margin longwave flux in physically-based melt models results in an improved assessment of tropical glacier energy budget and meltwater generation.

scholarly journals Pulse Radar Randomly Interrupted Transmitting and Receiving Optimization Based on Genetic Algorithm in Radio Frequency Simulation

2020 ◽  
Author(s):  
Xiaobin LIU ◽  
Feng Zhao ◽  
Xiaofeng Ai ◽  
Qihua Wu
Keyword(s):  
Genetic Algorithm ◽  
High Resolution ◽  
Correlation Coefficient ◽  
Optimization Method ◽  
Sensing Matrix ◽  
Pulse Radar ◽  
Range Profile ◽  
Reconstruction Performance ◽  
Simulation Results ◽  
High Resolution Range Profile

Abstract The interrupted transmitting and receiving (ITR) can be used in anechoic chamber to solve the coupling between the transmitted and reflected signals. When the ITR periods are random, the fake peaks in high resolution range profile (HRRP) of ITR echo can be reduced. Then, by utilizing the piecewise sparse property of ITR echo, the HRRP is reconstructed based on compressive sensing (CS). However, the periods of ITR determine the restricted isometry property (RIP) condition and the HRRP reconstruction performance. In order to improve the HRRP reconstruction performance, the ITR periods sequence optimization method based on genetic algorithm (GA) is proposed in this paper. The correlation coefficient of the sensing matrix columns is minimized after optimization so that the RIP of sensing matrix can be well satisfied . Simulation results illustrate that the optimization method converges fast and the HRRP reconstruction performance is improved with the optimized ITR periods .

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