Experimental and computational results for a power-law elliptic-section projectile in a supersonic air-stream

2001 ◽  
Author(s):  
Paul Schuricht ◽  
James Forsythe ◽  
Gregg Abate ◽  
John Bertin ◽  
Michael Smith
Keyword(s):  
Power Law ◽  
Computational Results ◽  
Air Stream ◽  
Elliptic Section

Crack Tip Strain Distributions and Their Implications to Crack Growth Rate due to Stress Corrosion Cracking

2015 ◽  
Author(s):  
Shin-Jang Sung ◽  
Nikhil Kotasthane ◽  
Yugo Ashida ◽  
Jwo Pan
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Stress Corrosion ◽  
Crack Growth ◽  
Power Law ◽  
Stress Corrosion Cracking ◽  
Radial Distance ◽  
Crack Tip ◽  
Computational Results ◽  
Plastic Materials

In this paper, stress and strain distributions near a crack tip in a round compact tension specimen of elastic-plastic materials are obtained by finite element analyses. The strain distributions are used to explore the use of the crack tip strain distributions for crack growth rate models due to stress corrosion cracking in unirradiated and irradiated steels with different yield stresses and hardening behaviors. Both power-law hardening and perfectly plastic materials are considered. The computational results indicate that the critical radial distance to the tip based on the crack tip opening displacement is outside of the Hutchinson-Rice-Rosengren (HRR) dominant zone for power-law hardening materials in a round compact tension specimen under the stress intensity factor typically considered for stress corrosion cracking. For both the power-law hardening and perfectly plastic materials, the computational results show that the strain distributions are different from those of the analytical solutions for the range of the radial distance larger than the critical radial distance based on the crack opening displacement within the plastic zones. The computational results suggest that for the stress intensity factor typically considered for stress corrosion crack growth rate models, computational results are needed to estimate the strain rate for developing crack growth rate models to correlate to the experimental data.

Comparison between measurements and computations for power-law elliptic section bodies

2000 ◽  
Author(s):  
Paul Schuricht ◽  
James Forsythe ◽  
John Bertin ◽  
Gregg Abate
Keyword(s):  
Power Law ◽  
Elliptic Section

Supersonic flowfield for a slender, power-law elliptic-section (PLES) projectile

2000 ◽  
Author(s):  
Timothy Pesek ◽  
John Bertin ◽  
James Forsythe ◽  
Stephen Plintze ◽  
Paul Schuricht ◽  
...  
Keyword(s):  
Power Law ◽  
Elliptic Section

scholarly journals Fractal dimension of coastline of Australia

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Akhlaq Husain ◽  
Jaideep Reddy ◽  
Deepika Bisht ◽  
Mohammad Sajid
Keyword(s):  
Fractal Dimension ◽  
Parallel Processing ◽  
Programming Language ◽  
Power Law ◽  
Fractal Geometry ◽  
Parallel Computer ◽  
Processing Algorithm ◽  
Computational Results ◽  
Random Fractal

AbstractCoastlines are irregular in nature having (random) fractal geometry and are formed by various natural activities. Fractal dimension is a measure of degree of geometric irregularity present in the coastline. A novel multicore parallel processing algorithm is presented to calculate the fractal dimension of coastline of Australia. The reliability of the coastline length of Australia is addressed by recovering the power law from our computational results. For simulations, the algorithm is implemented on a parallel computer for multi-core processing using the QGIS software, R-programming language and Python codes.

Analysis of power law assumptions for short-period comets and Kuiper bodies

1999 ◽  
Vol 173 ◽  
pp. 289-293 ◽  
Author(s):  
J.R. Donnison ◽  
L.I. Pettit
Keyword(s):  
Power Law ◽  
Pareto Distribution ◽  
Limited Data ◽  
Short Period ◽  
Probability Plots ◽  
Exponential Probability

AbstractA Pareto distribution was used to model the magnitude data for short-period comets up to 1988. It was found using exponential probability plots that the brightness did not vary with period and that the cut-off point previously adopted can be supported statistically. Examination of the diameters of Trans-Neptunian bodies showed that a power law does not adequately fit the limited data available.

Hearing in Mice by GSR Audiometry: II. Magnitude of Unconditioned GSR as a Function of Intensity and Frequency Interactions

1968 ◽  
Vol 11 (1) ◽  
pp. 169-178 ◽  
Author(s):  
Alan Gill ◽  
Charles I. Berlin
Keyword(s):  
Power Law ◽  
Response Magnitude ◽  
Single Units ◽  
Spectral Content ◽  
Hearing Sensitivity ◽  
Subjective Magnitude ◽  
Orderly Fashion ◽  
Viiith Nerve

The unconditioned GSR’s elicited by tones of 60, 70, 80, and 90 dB SPL were largest in the mouse in the ranges around 10,000 Hz. The growth of response magnitude with intensity followed a power law (10 .17 to 10 .22 , depending upon frequency) and suggested that the unconditioned GSR magnitude assessed overall subjective magnitude of tones to the mouse in an orderly fashion. It is suggested that hearing sensitivity as assessed by these means may be closely related to the spectral content of the mouse’s vocalization as well as to the number of critically sensitive single units in the mouse’s VIIIth nerve.

How Useful is the Power Law of Practice for Recognizing Practice in Concentration Tests?

2007 ◽  
Vol 23 (3) ◽  
pp. 157-165 ◽  
Author(s):  
Carmen Hagemeister
Keyword(s):  
Logistic Regression ◽  
Reaction Time ◽  
Power Law ◽  
Error Rate ◽  
Reaction Times ◽  
Practice Effect ◽  
Practice Effects ◽  
Rate Decrease ◽  
Small Practice

Abstract. When concentration tests are completed repeatedly, reaction time and error rate decrease considerably, but the underlying ability does not improve. In order to overcome this validity problem this study aimed to test if the practice effect between tests and within tests can be useful in determining whether persons have already completed this test. The power law of practice postulates that practice effects are greater in unpracticed than in practiced persons. Two experiments were carried out in which the participants completed the same tests at the beginning and at the end of two test sessions set about 3 days apart. In both experiments, the logistic regression could indeed classify persons according to previous practice through the practice effect between the tests at the beginning and at the end of the session, and, less well but still significantly, through the practice effect within the first test of the session. Further analyses showed that the practice effects correlated more highly with the initial performance than was to be expected for mathematical reasons; typically persons with long reaction times have larger practice effects. Thus, small practice effects alone do not allow one to conclude that a person has worked on the test before.

Sign in / Sign up

Export Citation Format

Share Document