ON ADHESIVE THEORIES IN MULTILAYERED INTERFACES, WITH PARTICULAR REGARD TO "SURFACE FORCE APPARATUS" GEOMETRY

Adhesion is a key factor in many tribological processes, especially wear. We generalize a recent formulation for the indentation of a multilayered material using an efficient integral transform method, to the case of adhesion, using a simple energetic transformation in the JKR regime. Then, we specialize the study for the geometry of the Surface Force Apparatus, which consists of two thin layers on a substrate, where the intermediate layer is softer than the other two. We find the pull-off force under "force control" (i.e. for "soft" loading systems), as well as under "displacement control" (i.e. for "rigid" systems), as a function of the geometrical thicknesses and material properties ratios, and the method is fully implemented in a fast Mathematica code, available to the public (see Appendix).

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Integral transform method for rigid-line problem in an infinite plate

Engineering Fracture Mechanics ◽

10.1016/0013-7944(94)90166-x ◽

1994 ◽

Vol 47 (5) ◽

pp. 773-775 ◽

Cited By ~ 2

Author(s):

Y.Z. Chen

Keyword(s):

Integral Transform ◽

Infinite Plate ◽

Transform Method ◽

Rigid Line ◽

Integral Transform Method

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Improved Integral Transform Method Based on Gaussian Kernel for Image Reconstruction

IEEE Transactions on Computational Imaging ◽

10.1109/tci.2021.3117883 ◽

2021 ◽

pp. 1-1

Author(s):

Pengfei Nie ◽

Bin Liu ◽

Ping Chen ◽

Yan Han

Keyword(s):

Image Reconstruction ◽

Integral Transform ◽

Gaussian Kernel ◽

Transform Method ◽

Integral Transform Method

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Homotopy perturbation new integral transform method for numeric study of space- and time- fractional (n+1)-dimensional heat- and wave-like equations

Waves Wavelets and Fractals ◽

10.1515/wwfaa-2018-0003 ◽

2018 ◽

Vol 4 (1) ◽

pp. 19-36 ◽

Cited By ~ 2

Author(s):

Brajesh Kumar Singh

Keyword(s):

Integral Transform ◽

Transform Method ◽

Homotopy Perturbation ◽

Space And Time ◽

Integral Transform Method

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Research on Big Data Digging of Hot Topics about Recycled Water Use on Micro-Blog Based on Particle Swarm Optimization

Sustainability ◽

10.3390/su10072488 ◽

2018 ◽

Vol 10 (7) ◽

pp. 2488 ◽

Cited By ~ 64

Author(s):

Hanliang Fu ◽

Zhaoxing Li ◽

Zhijian Liu ◽

Zelin Wang

Keyword(s):

Big Data ◽

Particle Swarm Optimization ◽

Key Words ◽

Water Use ◽

Particle Swarm ◽

Recycled Water ◽

Swarm Optimization ◽

The Public ◽

Key Factor ◽

Important Significance

The public’s acceptance level of recycled water use is a key factor that affects the popularization of this technology; therefore, it is critical to know the public’s attitude in order to make guiding policies effectively and scientifically. To examine the major focuses and hot topics among the public about recycled water use, one of the major platforms for social opinion in China, the micro blog, is used as a source to obtain data related to the topic. Through the “follow-be followed” and “forward-dialogue” behaviors, a network of discussion of recycled water use among micro-blog users has been constructed. Improved particle swarm optimization has been used to allow deep digging for key words. Ultimately, key words about the topic of have been clustered into three categories, namely, the popularization status of recycled water use, the main application, and the public’s attitude. The conclusion accurately describes the concerns of Chinese citizens regarding recycled water use, and has important significance for the popularization of this technology.

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Exploring public engagement with missing person appeals on Twitter

10.31235/osf.io/wugxs ◽

2020 ◽

Author(s):

Reka Solymosi ◽

Oana Petcu ◽

Jack Wilkinson

Keyword(s):

Social Media ◽

Public Engagement ◽

Evidence Base ◽

Evidence Based ◽

The Public ◽

Missing Persons ◽

Early Return ◽

Police Agencies ◽

Key Factor ◽

Twitter Account

Police agencies globally are seeing an increase in reports of people going missing. These people are often vulnerable, and their safe and early return is a key factor in preventing them from coming to serious harm. One approach to quickly find missing people is to disseminate appeals for information using social media. Yet despite the popularity of twitter-based missing person appeals, presently little is known about how to best construct these messages to ensure they are shared far and wide. This paper aims to build an evidence-base for understanding how police accounts tweet appeals for information about missing persons, and how the public engage with these tweets by sharing them. We analyse 1,008 Tweets made by Greater Manchester Police between the period of 2011 and 2018 in order to investigate what features of the tweet, the twitter account, and the missing person are associated with levels of retweeting. We find that tweets with different choice of image, wording, sentiment, and hashtags vary in how much they are retweeted. Tweets that use custody images have lower retweets than Tweets with regular photos, while tweets asking the question “have you seen...?” and asking explicitly to be retweeted have more engagement in the form of retweets. These results highlight the need for conscientious, evidence-based crafting of missing appeals, and pave the way for further research into the causal mechanisms behind what affects engagement, to develop guidance for police forces worldwide.

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Reflection of an Acoustic Step Wave From an Elastic Cylinder

Journal of Applied Mechanics ◽

10.1115/1.4011696 ◽

1958 ◽

Vol 25 (1) ◽

pp. 103-108

Author(s):

Richard Skalak ◽

M. B. Friedman

Keyword(s):

Integral Transform ◽

Formal Solution ◽

Elastic Cylinder ◽

Transform Method ◽

Pressure Fields ◽

Plane Step ◽

Single Integral ◽

Short Time ◽

Acoustic Fluid

Abstract An elastic cylinder, circular in section and infinite in length, is considered in an infinite acoustic fluid. The object of this paper is the determination of the reflected and diffracted pressure fields at large distances resulting from a plane step wave of pressure impinging on the cylinder and moving in a direction normal to the axis of the cylinder. A formal solution is obtained for the general case of an elastic cylinder. Numerical results are computed for rigid, fixed cylinders, and for rigid, floating cylinders. Two different methods are used to achieve results in the different ranges of time which are of interest. A short time approximation is developed by the use of a double integral-transform method. A mode approach and a single integral transform are used for later times. The results show that the reflected pulse decays quickly, within a time on the order of the transit time of the original wave across the cylinder.

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Musicianship and the Cult of Personality

The Evolution of Music through Culture and Science ◽

10.1093/oso/9780198848400.003.0003 ◽

2019 ◽

pp. 31-50

Author(s):

Peter Townsend

Keyword(s):

Public Perception ◽

Public Access ◽

The Public ◽

Key Factor ◽

The Status ◽

Cult Of Personality ◽

Concert Halls

Public access to secular music started the cult of superstars. Composition matched this new demand. Stars were eclipsed by ever greater virtuosity. This created a demand for more powerful instruments and better concert halls. Fame was equally available for the conductors. The pattern continues to the present day, with faster tempi, more power in performances, larger orchestras, and access to a wider range of music from recordings and broadcasts. We like this concept of idols, even if we can rapidly switch them off, to replace them with new ones. Nevertheless, they influence our musical tastes. A key factor in this is attributed to the new sounds generated by the science of recordings and electronics. The science that has allowed superstars to be heard worldwide has also changed the public perception of musicians and raised them from the unfashionable to include some with the status of musical heroes (and heroines).

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