scholarly journals Digital comparative analysis of simulation results of radioactive deposition field of nuclear explosion

2021 ◽  
Vol 2087 (1) ◽  
pp. 012092
Author(s):  
Yunlong Liu ◽  
Xiaobing Geng ◽  
Mei Xu
Keyword(s):  
Comparative Analysis ◽  
Diffusion Model ◽  
Nuclear Explosion ◽  
Measured Data ◽  
Absolute Difference ◽  
Particle Diffusion ◽  
Effectiveness Measurement ◽  
Simulation Results

Abstract The radioactive settlement of nuclear explosion is simulated by Lagrange particle diffusion model. The simulated settlement map and the measured data map are digitally extracted into the same format. The effectiveness measurement (MOE) method and normalized absolute difference (NAD) method are used to conduct numerical comparative analysis between each dose simulation area and the measured area.

Modeling the Microwave Transmissivity of Row Crops

2021 ◽  
Vol 36 (6) ◽  
pp. 816-823
Author(s):  
Jeil Park ◽  
Praveen Gurrala ◽  
Brian Hornbuckle ◽  
Jiming Song
Keyword(s):  
Soil Moisture ◽  
Analytical Solutions ◽  
Periodic Boundary ◽  
Periodic Boundary Conditions ◽  
Measured Data ◽  
Row Crops ◽  
Satellite Retrieval ◽  
Unit Cells ◽  
Simulation Results ◽  
Agricultural Regions

We develop a method to model the microwave transmissivity of row crops that explicitly accounts for their periodic nature as well as multiple scattering. We hypothesize that this method could eventually be used to improve satellite retrieval of soil moisture and vegetation optical depth in agricultural regions. The method is characterized by unit cells terminated by periodic boundary conditions and Floquet port excitations solved using commercial software. Individual plants are represented by vertically oriented dielectric cylinders. We calculate canopy transmissivity, reflectivity, and loss in terms of S-parameters. We validate the model with analytical solutions and illustrate the effect of canopy scattering. Our simulation results are consistent with both simulated and measured data published in the literature.

scholarly journals Optimal Sizing of a Pv-Wind Hybrid System Using Measured and Generated Database

2021 ◽  
Vol 03 (01) ◽  
pp. 34-44
Author(s):  
Abdellah Benallal ◽  
◽  
Nawel Cheggaga ◽  
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Wind Turbine ◽  
Hybrid Systems ◽  
Hybrid System ◽  
Measured Data ◽  
Electrical Load ◽  
Wind Potential ◽  
Simulation Results ◽  
The Cost

Renewable energy hybrid systems give a good solution in isolated sites, in the Algerian desert; wind and solar potentials are considerably perfect for a combination in a renewable energy hybrid system to satisfy local village electrical load and minimize the storage requirements, which leads to reduce the cost of the installation. For a good sizing, it is essential to know accurately the solar potential of the installation area also wind potential at the same height where wind electric generators will be placed. In this work, we optimize a completely autonomous PV-wind hybrid system and show the techno-economical effects of the height of the wind turbine on the sizing of the hybrid system. We also compare the simulation results obtained from using wind speed measured data at 10 meters and 40 meters of height with the ones obtained from using wind speed extrapolation on HOMER software.

scholarly journals ONLINE PARAMETER IDENTIFICATION OF RICE TRANSPLANTER MODEL BASED ON IPSO-EKF ALGORITHM

2020 ◽  
Vol 61 (2) ◽  
pp. 25-34 ◽  
Author(s):  
Yibo Li ◽  
Hang Li ◽  
Xiaonan Guo
Keyword(s):  
Parameter Identification ◽  
Measured Data ◽  
Model Parameters ◽  
Identification Algorithm ◽  
Output Data ◽  
Swarm Optimization ◽  
Model Based ◽  
Simulation Results ◽  
Filtering Effect ◽  
Ipso Algorithm

In order to improve the accuracy of rice transplanter model parameters, an online parameter identification algorithm for the rice transplanter model based on improved particle swarm optimization (IPSO) algorithm and extended Kalman filter (EKF) algorithm was proposed. The dynamic model of the rice transplanter was established to determine the model parameters of the rice transplanter. Aiming at the problem that the noise matrices in EKF algorithm were difficult to select and affected the best filtering effect, the proposed algorithm used the IPSO algorithm to optimize the noise matrices of the EKF algorithm in offline state. According to the actual vehicle tests, the IPSO-EKF was used to identify the cornering stiffness of the front and rear tires online, and the identified cornering stiffness value was substituted into the model to calculate the output data and was compared with the measured data. The simulation results showed that the accuracy of parameter identification for the rice transplanter model based on the IPSO-EKF algorithm was improved, and established an accurate rice transplanter model.

Electrical Chip-Board Interaction (e-CBI) of Wafer Level Packaging Technology

2017 ◽  
Vol 2017 (1) ◽  
pp. 000325-000330 ◽  
Author(s):  
Wei Zhao ◽  
Mark Nakamoto ◽  
Karthikeyan Dhandapani ◽  
Brian Henderson ◽  
Ron Lindley ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Measured Data ◽  
Circuit Board ◽  
Wafer Level ◽  
Test Chip ◽  
Chip Design ◽  
Packaging Technology ◽  
Printed Circuit ◽  
Wafer Level Packaging ◽  
Simulation Results

Abstract Electrical Chip Board Interaction (e-CBI) has emerged as a new risk in chip design as silicon die can directly interact with printed circuit board (PCB) in substrate-less wafer level packaging technology. To assess this risk Qualcomm Technologies, Inc. has converted an existing test chip to wafer level packaging technology. Both the measured data and simulation results show that e-CBI risk is significant and must be carefully managed.

Analysis of Surface Roughness Transformation of Oxide Scale during Hot Steel Manufacturing

2010 ◽  
Vol 126-128 ◽  
pp. 987-992
Author(s):  
Zheng Yi Jiang ◽  
Jian Ning Tang ◽  
A. Kiet Tieu ◽  
Wei Hua Sun ◽  
Dong Bin Wei
Keyword(s):  
Surface Roughness ◽  
Oxide Scale ◽  
Measured Data ◽  
Initial Surface ◽  
Surface Asperity ◽  
Decrease Rate ◽  
Steel Manufacturing ◽  
Simulation Results ◽  
Scale Surface

In this paper, the effects of the surface asperity wavelength, reduction and lubrication (friction) on the surface roughness transformation of the oxide scale have been studied. The simulation results show that the oxide scale surface roughness decreases with an increase of the average asperity wavelength and reduction. The initial surface roughness affects the decrease rate of surface roughness when the reduction increases. The surface roughness of the oxide scale and steel is quite close when the rolling with lubrication and both of them are reduced with reduction, and the surface roughness of the oxide scale is reduced less comparing with that of without lubrication case. The calculated roughness is close to the measured data.

Dynamic Simulation and Test for the Valve Train Dynamics

2011 ◽  
Vol 117-119 ◽  
pp. 15-19 ◽  
Author(s):  
Cai Yun Guan ◽  
You Ming Chen ◽  
Wen Jie Qin
Keyword(s):  
Dynamic Model ◽  
Contact Stiffness ◽  
Quantitative Agreement ◽  
Measured Data ◽  
Valve Train ◽  
Parameter Determination ◽  
Cam Follower ◽  
Train Dynamics ◽  
Simulation Results

This paper presents the development of a dynamic model of the valve train of one engine. During the parameter determination of the model, finite element method is used to calculate the contact stiffness of the cam-follower . The simulation results of the model are compared with measured data of the valve train at same speed. Excellent quantitative agreement is found between the numerical and experimental results and the validity of the dynamic model can be verified.

Verification of Stress Model in Dissimilar Materials of Varying Cladded Pipes Using a Similar Cladded Plate Model

2020 ◽  
Author(s):  
Bridget Kogo ◽  
Bin Wang ◽  
Mahmoud Chizari ◽  
Luiz Wrobel
Keyword(s):  
Close Agreement ◽  
Dissimilar Materials ◽  
Dynamic Measurement ◽  
Measured Data ◽  
Transient Temperature ◽  
Plate Model ◽  
Finite Element Software ◽  
Weld Joints ◽  
Pipe Model ◽  
Simulation Results

Abstract This paper continues previous research performed by the authors on the modelling of dissimilar welded joints with varying clad thicknesses. This study aims to validate the use of a clad plate model as a replacement to the previous clad pipe model. To fulfill the hypothesis of the study, possible deformation or angular shrinkages occurring at weld joints have been simulated using a commercial finite element software. In parallel, angular shrinkages have been validated using the experimental data with the underlying concept of Gaussian transformation of plates into pipes. The welding of the two dissimilar materials has been carried out in-house with the aid of a Tungsten Arc weld with dynamic measurement of the temperature profile in the vicinity areas of the welding track using high temperature thermocouples. It was discovered that for each deformation angle of 11.5°, 22.75°, 40° and 45°, there exists shrinkage of the order of 0.01mm. Transient temperature curves have been generated for different cladding thicknesses (of stainless steel and mild steel). Comparison of the measured data versus the simulation results shows close agreement.

Comparative Analysis of Grid Connected Photovoltaic Based Z-Source Inverter with PI and PID Controllers

2017 ◽  
Vol 14 (1) ◽  
pp. 577-584
Author(s):  
S Kamalakkannan ◽  
D Kirubakaran
Keyword(s):  
Comparative Analysis ◽  
Pid Controllers ◽  
Grid System ◽  
Pv System ◽  
Matlab Simulink ◽  
Pv Inverter ◽  
Pv Panel ◽  
Time Period ◽  
Ac Current ◽  
Simulation Results

In this work, a grid system attached Z-Source inverters for PV system with perturb and observation algorithm is projected for changing irradiance and to use full obtainable PV power. The boost operation of PV power is attained in inverter using the perception of shoot-through time period. The PV inverter is an important component in a PV system. It executes the conversion of variable DC output of the PV panel module(s) in to pure sinusoidal 50Hz AC current. This pure sinusoidal AC in turn is fed to the grid connected system. The simulation is carried out in Matlab/Simulink platform and benefits of projected systems are emphasised with the aid of simulation results.

Transport barriers with magnetic shear in a tokamak

2007 ◽  
Vol 73 (4) ◽  
pp. 439-453 ◽  
Author(s):  
M. EL MOUDEN ◽  
D. SAIFAOUI ◽  
A. DEZAIRI ◽  
B. ZINE ◽  
M. EDDAHBY
Keyword(s):  
Anomalous Transport ◽  
Particle Diffusion ◽  
Magnetic Shear ◽  
Transport Barriers ◽  
Simulation Results ◽  
Reversed Shear

AbstractThe reversed magnetic shear is the most important factor in the study of the plasmas of a tokamak. In this paper we focus our research, as a first stage, on the control of the improved confinement regimes by studying the influence of the reversed shear on its quality in the plasma of a tokamak and especially in reducing the anomalous transport in ITER. Then we study the influence of the perturbation modes on the particle diffusion. At the end, a comparison between simulation results obtained using ITER and TEXT parameters is carried out.

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