Results 121 to 130 of about 376,430 (233)

Friction law and hysteresis in granular materials. [PDF]

Proc Natl Acad Sci U S A, 2017
DeGiuli E, Wyart M.
europepmc   +1 more source

Origins of Graphite Resistivity: Decoupling Stacking Fault and Rotational Misorientation

Advanced Science, EarlyView.
Interfacial dislocations critically influence interlayer transport in van der Waals (vdW) materials, yet quantifying their individual contributions remains challenging. We measure graphite's c‐axis resistivity and develop a decoupling strategy, revealing a resistivity ratio of ∼4507:74:1 for rotational misorientations, stacking faults, and AB stacking,
Weipeng Chen, Fuwei Yang, Tielin Wu, Yelingyi Wang, Quanshui Zheng, Deli Peng, Zhanghui Wu   +6 more
wiley   +1 more source

The effects of crack surface friction and roughness on crack tip stress fields [PDF]

A model is presented which can be used to incorporate the effects of friction and tortuosity along crack surfaces through a constitutive law applied to the interface between opposing crack surfaces.
Ballarini, Roberto, Plesha, Michael E.
core   +1 more source

Deformation Driven Suction Cups: A Mechanics‐Based Approach to Wearable Electronics

Advanced Science, EarlyView.
Deformation‐driven suction cups enable robust, reversible adhesion of wearable electronics to human skin spanning wide mechanical compliance, without adhesives or tight straps. By integrating mechanics modeling, experiments, and contact mechanics theory, this work reveals how cup geometry, substrate compliance, and interfacial adhesion govern suction ...
Seola Lee, Andrew Akerson, Roham Pardakhtim, Ehsan Hajiesmaili, Kevin Rhodes, Zidong Li, Andrew Stanley, Amirhossein Amini, Daniele Piazza, Chiara Daraio, Tianshu Liu   +10 more
wiley   +1 more source

Stiffness Calculation and Influence Factor Analysis of Spur Gear Pair Considering Time-varying Friction

Jixie chuandong, 2019
Aiming at the problem of time-varying friction in the meshing process of spur gear pair, the meshing model of spur gear pair is established, and the relative sliding velocity, rolling speed, sliding-rolling ratio, comprehensive radius of curvature and ...
Tao Zhang, Zeyin He, Shirong Yin, Shizheng Sun   +3 more
doaj  

An empirically based steady state friction law and implications for fault stability. [PDF]

Geophys Res Lett, 2016
Spagnuolo E, Nielsen S, Violay M, Di Toro G.   +3 more
europepmc   +1 more source

Salt Water Drops Slide Faster: Ionic Modulation of Drop Friction

Advanced Science, EarlyView.
Salt ions markedly accelerate water drops on conductive substrates coated with nanometer‐thin hydrophobic layers. Across diverse electrolytes and surfaces, higher ion concentration consistently lowers kinetic friction by reducing contact angle hysteresis.
Dongho Shin, Rutvik Lathia, Chirag Hinduja, Hyunbae Cheon, Seongmin Park, Hans‐Jürgen Butt, Junwoo Park   +6 more
wiley   +1 more source

In‐Wheel Piezoelectric DC Power Generator With Zero Resistive Torque

Advanced Science, EarlyView.
In this paper, we present a wheel‐shaped direct‐current piezoelectric generator (DC‐PG) that fundamentally overcomes these constraints by producing phase‐stable DC electricity directly from rolling motion. By embedding this system into suitcase wheels, we demonstrated a fully integrated real‐time location tracking system powered solely by mechanical ...
Hyun Soo Kim, Hyunseok Song, In Woo Oh, Dong‐Gyu Lee, Tae Kyoung Yoon, Jeyeon Lee, Byoung Jin Yoon, So‐Min Song, Iman M. Imani, Seohyun Cho, Seong Jin Kim, Chong‐Yun Kang, Sahn Nahm, Yong Seok Park, Kyung‐Hoon Cho, Jungho Ryu, Jeong Min Baik, Jun Chen, Sunghoon Hur, Hyun‐Cheol Song   +19 more
wiley   +1 more source

Improving the Thermoelectric Properties of Conjugated Polymer Thin Films by Dip Coating – but not through Alignment

Advanced Electronic Materials, EarlyView.
The study demonstrates that dip coating at lower speeds significantly enhances the thermoelectric performance of P3HT by improving electrical conductivity. Contrary to expectations, this improvement is seemingly not due to polymer alignment but rather to better structural order achieved during slower solvent evaporation at lower dip coating speeds ...
Morteza Shokrani, Andrey Alekseevich Butkevich, Martijn Kemerink   +2 more
wiley   +1 more source

Thermoelectric Properties of a Family of Benzodifuranone‐Based Conjugated Copolymers in Oriented Thin Films Doped Sequentially With NDMBI‐H

Advanced Electronic Materials, EarlyView.
Combining high polymer orientation of n‐type copolymers by temperature rubbing and sequential doping with N‐DMBI results in a strong improvement of electrical conductivity and thermoelectric power factors reaching up to 9.8 ± 1.6 S cm−1 and 8 ± 3 µW m−1.K2, respectively.
Shubhradip Guchait, Diego R. Hinojosa, Nathan James Pataki, Said Oummouch, Laurent Herrmann, Mario Caironi, Michael Sommer, Martin Brinkmann   +7 more
wiley   +1 more source