scholarly journals Contact theory and the multiethnic community of Riace, Italy: An ethnographic examination

2021 ◽  
Author(s):  
Ester Y. Driel ◽  
Maykel Verkuyten
Keyword(s):  
Contact Theory ◽  
Ethnographic Examination

Women with Disability, Paralympics, and Reasoned Action Contact Theory

1993 ◽  
Vol 2 (2) ◽  
pp. 51-60 ◽  
Author(s):  
Claudine Sherrill
Keyword(s):  
Feminist Theory ◽  
Physical Disability ◽  
Reasoned Action ◽  
Contact Theory ◽  
Equal Access ◽  
Women In Sport ◽  
The World ◽  
Race Ethnicity ◽  
Underrepresentation Of Women ◽  
Women With Disability

The underrepresentation of women in the Paralympics movement warrants attention as the world prepares for Atlanta 1996, when Paralympics (conducted after the Summer Olympics) will attract approximately 3,500 athletes with physical disability or visual impairment from 102 countries. Barriers that confront women with disability, the Paralympic movement, and adapted physical activity as a profession and scholarly discipline that stresses advocacy and attitude theories are presented. Two theories (reasoned action and contact) that have been tested in various contexts are woven together as an approach particularly applicable to women in sport and feminists who care about equal access to opportunity for all women. Women with disability are a social minority that is both ignored and oppressed. Sport and feminist theory and action should include disability along with gender, race/ethnicity, class, and age as concerns and issues.

scholarly journals Investigation on indentation rolling resistance of belt conveyor based on Hertz contact theory compared with one-dimensional Winkler foundation

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878393 ◽  
Author(s):  
Lu Yan
Keyword(s):  
Rolling Resistance ◽  
Contact Theory ◽  
Theoretical Formula ◽  
Winkler Foundation ◽  
Hertz Contact ◽  
Belt Conveyor ◽  
One Dimensional ◽  
Hertz Contact Theory ◽  
Viscoelastic Theory ◽  
Indentation Rolling Resistance

Based on Hertz contact theory and one-dimensional Winkler foundation combination with viscoelastic theory, the author derived theoretical formulas of indentation rolling resistance, respectively. Using the laboratorial apparatus of indentation rolling resistance, the author mainly concentrates on the error analysis about two kinds of theoretical formula which bear on indentation rolling resistance compared with experimental result. The reason why author employs Hertz contact theory to discuss indentation rolling resistance is that indentation rolling resistance is a sort of contact resistance. As a result, Hertz contact theory is generally applicable to study it. On the other hand, because conveyor belt has viscoelastic property, it is appropriate to use viscoelastic theory by the aid of three-parameter Maxwell viscoelastic model combination with one-dimensional Winkler foundation. Ultimately, this article infers that theoretical formula based on the Hertz contact is brief and clear compared with one-dimensional Winkler foundation in principle. However, it is noticeable that when the belt is at high speed, the reliability of formula based on Hertz theory has decreased obviously. This conclusion can give a beneficial reference for the energy saving of belt conveyor.

Approximate Analytical Model for Hertzian Elliptical Wheel/Rail or Wheel/Crossing Contact Problems

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
F. D. Fischer ◽  
M. Wiest
Keyword(s):  
Contact Pressure ◽  
Contact Problems ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Technical Accuracy ◽  
Elliptical Contact ◽  
Current Approximation ◽  
Analytical Expressions ◽  
Maximum Contact ◽  
Hertzian Contact Theory

The Hertzian contact theory is approximated according to a concept by Tanaka (2001, “A New Calculation Method of Hertz Elliptical Contact Pressure,” ASME J. Tribol., 123, pp. 887–889) yielding simple analytical expressions for the elliptical semi-axes, the maximum contact pressure, the mutual approach and the contact spring constant. Several configurations are compared using the exact Hertz theory and the current approximation. The results agree within technical accuracy.

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