Results 91 to 100 of about 19,554 (250)

Modelling elastic structures with strong nonlinearities with application to stick-slip friction

, 2013
An exact transformation method is introduced that reduces the governing equations of a continuum structure coupled to strong nonlinearities to a low dimensional equation with memory.
Szalai, Robert
core   +1 more source

The Dynamic Energy Band Model of Contact‐Separation and Sliding Mode Triboelectric Charging of Polymers at the Metal‐Polymer Interface

Advanced Science, EarlyView.
Triboelectric charge generation at polymer‐metal interfaces arises from the interplay of intra‐ and inter transformation reactions of mechanochemically generated species, physical properties of polymers, environmental conditions. The direction and the magnitude of electron transfer between metal and polymer are dynamically governed by the relative ...
Sunay Dilara Ekim, Zelal Yavuz, Tuğba Demir Çalışkan, Hande Güler, H. Tarik Baytekin   +4 more
wiley   +1 more source

Combining the Pitcher and Lotus Plant: Supericephobic and Superhydrophobic Silicone Films

Advanced Science, EarlyView.
Based on bench‐top nanomolding of polydimethylsiloxane (PDMS) with optimized silicone oil content, we developed hierarchically structured silicone films by essentially combining the properties of the lotus and pitcher plant; particularly we are able to achieve water contact angle as high as 171° and ice adhesion strength as low as 11.5 kPa (i.e ...
Cliff L. W. Ng, Joshua Ham, Sanpreet Kaur, Clayton W. Schultz, Hua‐Zhong Yu   +4 more
wiley   +1 more source

Downhole vibration causing a drill collar failure and solutions

Natural Gas Industry B, 2017
In large borehole drilling of some blocks or formations, due to serious downhole vibration, fatigue failure of a drill collar occurs frequently and most washouts and fractures are in thread root.
Quanta Zhu, Zongming Zou, Bing Huang, Linhu Ma, Jiaxiang Xia   +4 more
doaj   +1 more source

Cascade‐Responsive MXene@Cu‐MOF Heterostructure Integrates Antioxidant Activity, Infection Control, and Vascularization for Tracheal Repair

Advanced Science, EarlyView.
A cascade‐responsive MXene@Cu‐MOF/GelMA hydrogel is engineered as a “skeleton–backpack” platform for extensive tracheal repair. The MXene framework scavenges postoperative ROS and converts NIR light into mild hyperthermia, while the Cu‐MOF component provides pH/NIR‐responsive Cu2+ dosing for infection control, angiogenesis, and chondrogenesis.
Liang Guo, Yingran Shen, Jiaoyu Yi, Juanjuan Li, Ziming Wang, Erji Gao, Siqiang Zheng, Zhe‐Sheng Chen, Bo Tao   +8 more
wiley   +1 more source

The effect of laser surface texturing to inhibit stick-slip phenomenon in sliding contact

Advances in Mechanical Engineering, 2019
Stick-slip phenomenon in some mechanical structures, especially in machine tools, should be eliminated or inhibited, otherwise the vibration will occur and the position error will inevitably be obtained. In this study, different kinds of surface textures
Hao Wang, Xuan Xie, Xijun Hua, Bifeng Yin, Hang Du, Sheng Xu, Bai Jing Qiu   +6 more
doaj   +1 more source

Static Friction Phenomena in Granular Materials: Coulomb Law vs. Particle Geometry

, 1993
The static as well as the dynamic behaviour of granular material are determined by dynamic {\it and} static friction. There are well known methods to include static friction in molecular dynamics simulations using scarcely understood forces.
A. Drescher, A. Rosato, A. Rosato, B. J. Briscoe, B. McNamara, C. A. Coulomb, C. Laroche, C. Tang, D. C. Hong, D. Dhar, E. Clement, E. N. Miranda, F. Dinkelacker, G. A. Held, G. Ristow, G. W. Baxter, G. W. Baxter, G. W. Baxter, H. Caram, H. J. Herrmann, H. M. Jaeger, H. M. Jaeger, H. M. Jaeger, I. Goldhirsch, J. A. C. Gallas, J. A. C. Gallas, J. C. Williams, J. Rajchenbach, J. Rajchenbach, J. Walker, K. L. Schick, K. Wiesenfeld, L. P. Kadanoff, M. Bretz, M. Faraday, M. P. Allen, O. Cutress, P. A. Thompson, P. Bak, P. Cundall, P. Devillard, P. Evesque, P. Evesque, P. Evesque, P. K. Haff, R. Jullien, S. B. Savage, S. B. Savage, S. R. Nagel, S. Soko l owski, T. G. Drake, T. G. Drake, T. Hwa, T. Pöschel, Thorsten Pöschel, Volkhard Buchholtz, Y. H. Taguchi, Y. Tsuji   +57 more
core   +2 more sources

Atomic Defects in Layered Transition Metal Dichalcogenides for Sustainable Energy Storage and the Intelligent Trends in Data Analytics

Advanced Science, EarlyView.
This review comprehensively summarizes the atomic defects in TMDs for their applications in sustainable energy storage devices, along with the latest progress in ML methodologies for high‐throughput TEM data analysis, offering insights on how ML‐empowered microscopy facilitates bridging structure–property correlation and inspires knowledge for precise ...
Zheng Luo, Ying Yang, Zizhen Fu, Fengqi Liu, Susu Fang, Kele Xu, Shanshan Wang   +6 more
wiley   +1 more source

Investigation and Analysis of Influential Parameters in Bottomhole Stick–Slip Calculation during Vertical Drilling Operations

Energies
The critical factors that affect bottomhole stick–slip vibrations during vertical drilling operations are thoroughly investigated and analyzed in this research.
Chinedu Ejike, Immanuel Frimpong Obuobi, Simon Avinu, Khizar Abid, Catalin Teodoriu   +4 more
doaj   +1 more source

Suppression of Drill-String Stick-Slip Vibration

MATEC Web of Conferences, 2018
We investigate experimentally and numerically suppression of drill-string torsional vibration while drilling by using a sliding mode control. The experiments are conducted on the novel experimental drilling rig developed at the University of Aberdeen [1]
Vaziri Vahid, Kapitaniak Marcin, Wiercigroch Marian   +2 more
doaj   +1 more source