New Biochemistry Building, Imperial College of Science and Technology, London

Thomas, Robert

doi:10.1038/209444a0

Cited by 3 publications

(17 citation statements)

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“…Arithmetic average height R a Arithmetic average height is defined as the average absolute deviation of roughness irregularities from the mean line over the sampling length. 20,22,23 It is the most important roughness parameter, which is used for quality control. It could also prepare the best general information about the height variations.…”

Section: Resultsmentioning

confidence: 99%

“…The value of skewness depends on the deviation of the profile from the mean line. 20,22,23,26,27 The negative skewness implies that valleys and deep scratches are predominant in the measuring profile. A symmetrical height distribution has zero skewness.…”

Section: Skewness R Skmentioning

confidence: 99%

“…It has a wide range of applications in manufacturing processes, biomaterials and surface quality control. 20 Roughness parameters such as average roughness, skewness and kurtosis are very useful factors for prediction of surface treatment effects on the wear and fatigue performance of treated surfaces. In general, an increase in average roughness increases the friction coefficient and decreases the fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

“…21 In some situations, average roughness remains constant during the surface treatment so that the skewness and kurtosis could have been used for surface quality evaluation. 20,22,23 These parameters are able to illustrate the details of surface morphology according to the asymmetry of profile about the mean line. [20][21][22] Fatigue crack nucleation, which is the dominant part of fatigue life, is a function of surface morphology, asperity shape and distributions.…”

Section: Introductionmentioning

confidence: 99%

“…20,22,23 These parameters are able to illustrate the details of surface morphology according to the asymmetry of profile about the mean line. [20][21][22] Fatigue crack nucleation, which is the dominant part of fatigue life, is a function of surface morphology, asperity shape and distributions. Therefore, these parameters could provide us very useful information about the effects of surface treatments on the fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

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High temperature oxidation effects on surface roughness of Ti–4Al–2V

Omidbakhsh

Ebrahimi

Sojka

2013

Surface Engineering

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The excellent properties of titanium and its alloys make them a perfect choice for many applications. In this paper, the effects of thermal oxidation condition on the surface morphology and surface roughness have been studied. The results showed that the average roughness at temperatures 450 and 600uC did not change significantly. Despite the constant average roughness, skewness and kurtosis parameters have been changed considerably during the thermal oxidation. The results suggest that the valleys are preferred sites for nucleation and growth of oxides. This mechanism changes the surface morphology from a scratched surface to a bumpy one.

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Section: Resultsmentioning

confidence: 99%

Section: Skewness R Skmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High temperature oxidation effects on surface roughness of Ti–4Al–2V

Omidbakhsh

Ebrahimi

Sojka

2013

Surface Engineering

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Numerical analysis of rough hydrodynamic bearings for various deterministic micro-asperity features

Prajapati¹

2021

Surf. Topogr.: Metrol. Prop.

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The hydrodynamic analysis of isotropic and anisotropic Gaussian surfaces has been studied well. However, the analysis reported earlier cannot simply apply to non-Gaussian and self-affine fractal rough surfaces, which demands a thorough investigation to study the effect of non-Gaussian nature of surfaces having different deterministic asperity features. This work demonstrates the effect of non-Gaussian and fractal nature of rough surfaces on hydrodynamic bearing characteristics. The modified Reynolds equation is used in this work with consideration of cavitation. The variation of asperity pressure, hydrodynamic load, and friction force with lambda ratio (the ratio of nominal film thickness to composite roughness) for various types of non-Gaussian and fractal rough surfaces is presented and discussed in detail. It is found that skewness, kurtosis, and fractal signature significantly affect the bearing load capacity and bearing friction force. No significant effect of types micro features is observed on asperity pressure. Asperity pressure is found to decrease with an increase in lambda ratio. More negative skewness results in a decrease in asperity pressure. Nomenclature S sk skewness H Hurst coefficient or fractal signature S ku kurtosis β correlation length, μm RECEIVED

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Impact of surface morphologies of substrates on the epitaxial growth of magnetron-sputtered (ZnO) _x (InN)_1-x films

Narishige¹,

Kaneshima²,

Yamashita³

et al. 2020

Jpn. J. Appl. Phys.

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The effects of substrates on the growth of sputter-deposited (ZnO) x (InN) 1-x (called "ZION" hereinafter) films have been investigated. We defined the figure of merit (FOM) of ZION films as the reciprocal of the product of full width at half maximum of X-ray rocking curves and root mean square (RMS) roughness. No clear correlation between the FOM and the RMS roughness of the substrates is observed; however, interestingly, a strong correlation between the FOM and the "skewness" of the surface height distribution of the substrates is observed. A possible reason for this is that the existence of a small portion of spikes on the surface, which appear as tiny tails in the distribution but are not reflected in the RMS roughness, limits the migration of adatoms and/or leads to secondary nucleation, degrading the quality of the subsequently grown ZION films. In addition, an atomically flat single-crystalline ZION film is grown on a ZnO template with a small skewness of 0.04.

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New Biochemistry Building, Imperial College of Science and Technology, London

Cited by 3 publications

References 0 publications

High temperature oxidation effects on surface roughness of Ti–4Al–2V

High temperature oxidation effects on surface roughness of Ti–4Al–2V

Numerical analysis of rough hydrodynamic bearings for various deterministic micro-asperity features

Impact of surface morphologies of substrates on the epitaxial growth of magnetron-sputtered (ZnO) _x (InN)_1-x films

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New Biochemistry Building, Imperial College of Science and Technology, London

Cited by 3 publications

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High temperature oxidation effects on surface roughness of Ti–4Al–2V

High temperature oxidation effects on surface roughness of Ti–4Al–2V

Numerical analysis of rough hydrodynamic bearings for various deterministic micro-asperity features

Impact of surface morphologies of substrates on the epitaxial growth of magnetron-sputtered (ZnO) x (InN)1-x films

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Impact of surface morphologies of substrates on the epitaxial growth of magnetron-sputtered (ZnO) _x (InN)_1-x films