Numerical simulation of regional short-range climate anomalies

1993 ◽  
Vol 10 (3) ◽  
pp. 335-344 ◽  
Author(s):  
Yang Fanglin ◽  
Yuan Chongguang
Keyword(s):  
Numerical Simulation ◽  
Short Range ◽  
Climate Anomalies

Efficient numerical simulation of the time dependence of electronic energy transfer in polymers. 1. Short-range transfer and trapping

1988 ◽  
Vol 21 (12) ◽  
pp. 3402-3413 ◽  
Author(s):  
Jeffrey D. Byers ◽  
Mark S. Friedrichs ◽  
Richard A. Friesner ◽  
S. E. Webber
Keyword(s):  
Numerical Simulation ◽  
Energy Transfer ◽  
Time Dependence ◽  
Short Range ◽  
Electronic Energy ◽  
Electronic Energy Transfer

Diagnosis of the Initial and Forecast Errors in the Numerical Simulation of the Rapid Intensification of Hurricane Emily (2005)

2009 ◽  
Vol 24 (5) ◽  
pp. 1236-1251 ◽  
Author(s):  
Zhaoxia Pu ◽  
Xuanli Li ◽  
Edward J. Zipser
Keyword(s):  
Numerical Simulation ◽  
Short Range ◽  
Inner Core ◽  
Initial Conditions ◽  
Forecast Errors ◽  
Rapid Intensification ◽  
Convective Structures ◽  
Level Data ◽  
Arw Model ◽  
Flight Level

Abstract A diagnostic study is conducted to examine the initial and forecast errors in a short-range numerical simulation of Hurricane Emily’s (2005) early rapid intensification. The initial conditions and the simulated hurricane vortices using high-resolution grids (1 and 3 km), generated from the Advanced Research version of the Weather Research and Forecasting (ARW) model and its three-dimensional variational data assimilation (3DVAR) systems, are compared with the flight-level data acquired from the U.S. Air Force C-130J aircraft data. Numerical simulation results show that the model fails at predicting the actual rapid intensification of the hurricane, although the initial intensity of the vortex matches the observed intensity. Comparing the model results with aircraft flight-level data, unrealistic thermal and convective structures of the storm eyewall are found in the initial conditions. In addition, the simulated eyewall does not contract rapidly enough during the model simulation. Increasing the model’s horizontal resolution from 3 to 1 km can help the model to produce a deeper storm and also a more realistic eye structure. However, even at 1 km the model is still not able to fully resolve the inner-core structures. To provide additional insight, a set of mesoscale reanalyses is generated through the assimilation of available satellite and aircraft dropsonde data into the ARW model throughout the whole simulation period at a 6-h interval. It is found that the short-range numerical simulation of the hurricane has been greatly improved by the mesoscale reanalysis; the data assimilation helps the model to reproduce stronger wind, thermal, and convective structures of the storm, and a more realistic eyewall contraction and eye structure. Results from this study suggest that a more accurate representation of the hurricane vortex, especially the inner-core structures in the initial conditions, is necessary for a more accurate forecast of hurricane rapid intensification.

Elements of Dynamics Analysis of the Warship Launcher of Anti-Aircraft Short Range Homing Missiles

2013 ◽  
Vol 196 ◽  
pp. 28-42 ◽  
Author(s):  
Zbigniew Dziopa
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Short Range ◽  
Dynamics Analysis ◽  
Aircraft Assembly ◽  
Homing Missiles

The paper presents a physical and mathematical model of a short range missile launcher based onboard a warship. The conducted numerical simulation allowed for developing an analysis of the anti-aircraft assembly dynamics. The selected responses of the system are demonstrated in the form of physical values characterizing the launcher motion.

Domain coarsening by grain boundary migration in ordered Ni4Mo

1986 ◽  
Vol 44 ◽  
pp. 560-561
Author(s):  
K. Vasudevan ◽  
H. P. Kao ◽  
C. R. Brooks ◽  
E. E. Stansbury
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Short Range ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Rapid Cooling ◽  
Temperature Range ◽  
Fee Structure ◽  
Domain Coarsening ◽  
Boundary Reaction

The Ni4Mo alloy has a short-range ordered fee structure (α) above 868°C, but transforms below this temperature to an ordered bet structure (β) by rearrangement of atoms on the fee lattice. The disordered α, retained by rapid cooling, can be ordered by appropriate aging below 868°C. Initially, very fine β domains in six different but crystallographically related variants form and grow in size on further aging. However, in the temperature range 600-775°C, a coarsening reaction begins at the former α grain boundaries and the alloy also coarsens by this mechanism. The purpose of this paper is to report on TEM observations showing the characteristics of this grain boundary reaction.

Ordering in Ni4Mo by TEM and APFIM

1987 ◽  
Vol 45 ◽  
pp. 214-215
Author(s):  
E.A. Kenik ◽  
T.A. Zagula ◽  
M.K. Miller ◽  
J. Bentley
Keyword(s):  
Electron Irradiation ◽  
Low Temperatures ◽  
Short Range ◽  
Atom Probe ◽  
Range Order ◽  
Considerable Time ◽  
Probe Field ◽  
Disordered Phase ◽  
Transmission Electron ◽  
Diffraction Patterns

The state of long-range order (LRO) and short-range order (SRO) in Ni4Mo has been a topic of interest for a considerable time (see Brooks et al.). The SRO is often referred to as 1½0 order from the apparent position of the diffuse maxima in diffraction patterns, which differs from the positions of the LRO (D1a) structure. Various studies have shown that a fully disordered state cannot be retained by quenching, as the atomic arrangements responsible for the 1½0 maxima are present at temperatures above the critical ordering temperature for LRO. Over 20 studies have attempted to identify the atomic arrangements associated with this state of order. A variety of models have been proposed, but no consensus has been reached. It has also been shown that 1 MeV electron irradiation at low temperatures (∼100 K) can produce the disordered phase in Ni4Mo. Transmission electron microscopy (TEM), atom probe field ion microscopy (APFIM), and electron irradiation disordering have been applied in the current study to further the understanding of the ordering processes in Ni4Mo.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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