scholarly journals Thermodynamics of Formation of Porous Polymeric Membrane by Phase Separation Method V. Probabilities of Finding Through-, Semi-Open, and Isolated Pores in Three-Dimensional Membrane Structure Model Constructed by Computer Simulation Experiment

1995 ◽  
Vol 27 (10) ◽  
pp. 1033-1043 ◽  
Author(s):  
Hideki Iijima ◽  
Akira Kataoka ◽  
Kenji Kamide
Keyword(s):  
Computer Simulation ◽  
Phase Separation ◽  
Membrane Structure ◽  
Simulation Experiment ◽  
Three Dimensional ◽  
Separation Method ◽  
Polymeric Membrane ◽  
Structure Model ◽  
Computer Simulation Experiment ◽  
Thermodynamics Of Formation

Error assessment for a provincial timber inventory

1995 ◽  
Vol 71 (5) ◽  
pp. 627-632 ◽  
Author(s):  
János Gál ◽  
Imre E. Bella
Keyword(s):  
Computer Simulation ◽  
Simulation Experiment ◽  
Sampling Error ◽  
Measurement Bias ◽  
Error Assessment ◽  
Volume Estimate ◽  
Computer Simulation Experiment ◽  
Volume Estimates ◽  
Timber Inventory

In this case study of the Saskatchewan provincial timber inventory, the major sources of errors were identified and suitable procedures presented for their estimation. Applying those procedures on a pilot area, the results showed that sampling error was by far the most important component affecting the accuracy of volume estimates. Variances arising from the use of taper functions to estimate tree volumes were under 0.05%, and variances from 3P subsampling were about 3% of the total variance. A computer simulation experiment showed that a 2% measurement bias in both diameter and height measurements may result in 8% bias in the volume estimate. Key words: 3P sampling, taper functions, error budget

Comparison of quasi-linear predictions with a computer simulation of whistler waves in unstable plasmas

1974 ◽  
Vol 11 (3) ◽  
pp. 397-401 ◽  
Author(s):  
S. Cuperman ◽  
L. R. Lyons
Keyword(s):  
Growth Rate ◽  
Computer Simulation ◽  
Distribution Function ◽  
Mode Coupling ◽  
Simulation Experiment ◽  
Electron Distribution Function ◽  
Linear Wave ◽  
Wave Growth ◽  
Whistler Mode Waves ◽  
Computer Simulation Experiment

The quasi-linear concept of plateau formation along resonant diffusion surfaces is compared with the time evolution of the electron distribution function during a computer simulation experiment of whistler-mode waves in unstable plasmas. It is found that, as the wave intensities grow, plateau formation does indeed occur, with the distribution function becoming constant along diffusion surfaces at the time when wave intensities maximize. Following the formation of the plateaus, both the wave intensities and the slope of the distribution function along diffusion surfaces oscillate in a manner suggesting msh;mode coupling. Tbe slope of the distribution function along diffusion surfaces, which controls the linear wave growth rate, also gives good predictions of the sign of the actual wave growth rate during the experiment.

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