Depth Effects: | ScienceGate

Abstract This paper discusses the measurement and modeling of tire rolling resistance for a group of radial medium truck tires. The tires were subjected to tread depth modifications by “buffing” the tread surface. The experimental work used the equilibrium test method of SAE J-1269. The finite element analysis (FEA) tire model for tire rolling resistance has been previously presented. The results of the testing showed changes in rolling resistance as a function of tread depth that were inconsistent between tires. Several observations were also inconsistent with published information and common knowledge. Several mechanisms were proposed to explain the results. Additional experiments and models were used to evaluate the mechanisms. Mechanisms that were examined included tire age, surface texture, and tire shape. An explanation based on buffed tread radius, and the resulting changes in footprint stresses, is proposed that explains the observed experimental changes in rolling resistance with tread depth.

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Investigation on the depth effects of the micro-grooves on the suppression of the second modes in the hypersonic boundary layer

Journal of Physics Conference Series ◽

10.1088/1742-6596/1786/1/012053 ◽

2021 ◽

Vol 1786 (1) ◽

pp. 012053

Author(s):

Qilong Guo ◽

Chen Li ◽

Guohua Tu ◽

Jianqiang Chen ◽

Bingbing Wan ◽

...

Keyword(s):

Boundary Layer ◽

Hypersonic Boundary Layer ◽

Depth Effects

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Absorption by Cyclotron Harmonics in the Optical Spectrum of VV Puppis

International Astronomical Union Colloquium ◽

10.1017/s0252921100076168 ◽

1979 ◽

Vol 53 ◽

pp. 334-340 ◽

Cited By ~ 1

Author(s):

H.S. Stockman ◽

James Liebert ◽

Howard E. Bond

Keyword(s):

White Dwarf ◽

Optical Spectrum ◽

Cyclotron Frequency ◽

Theoretical Models ◽

Doppler Broadening ◽

Cyclotron Emission ◽

Optical Continuum ◽

Cyclotron Harmonics ◽

Accretion Shock ◽

Depth Effects

Most theoretical models of the AM Her variables (AM Her, AN UMa, W Pup and 2A0311-22) rely on strong cyclotron emission at the fundamental cyclotron frequency and higher harmonics to produce the observed, strongly-polarized optical continuum (e.g. Lamb and Masters 1979). The cyclotron lines, which presumably originate in the hot, isothermal accretion shock at the surface of the white dwarf (kT ≳ 10 keV, h/R* ≲ 0.1), should be blurred into a continuous spectrum by both optical depth effects and electron Doppler broadening. Thus the lack of even weak cyclotron features in the optical spectra of these objects is still compatible with a cyclotron origin.

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