Results 41 to 50 of about 77,563 (254)

Photoswitching Conduction in Framework Materials

Advanced Functional Materials, EarlyView.
This mini‐review summarizes recent advances in state‐of‐the‐art proton and electron conduction in framework materials that can be remotely and reversibly switched on and off by light. It discusses the various photoswitching conduction mechanisms and the strategies employed to enhance photoswitched conductivity.
Helmy Pacheco Hernandez, Stefan Hecht, Wolfgang Wenzel, Lars Heinke, Mariana Kozlowska   +4 more
wiley   +1 more source

Operating mechanism and optimization of dynamic absorber for a system with negative damping

Nihon Kikai Gakkai ronbunshu, 2016
The self-excited vibration, such as galloping, dry friction induced vibration and so on, often occurs in many mechanical systems and structures. For several years, the effectiveness of a dynamic absorber for self-excited vibration has been known. However,
Tomoyuki TANIGUCHI, Takahiro KONDOU
doaj   +1 more source

Simplified prediction of stability limit for oil film bearing rotor systems

Nihon Kikai Gakkai ronbunshu, 2020
Oil film bearings are often used in large rotating machinery because they have large load capacity and damping coefficients. They, however, generate fluid forces and cause unstable vibrations such as oil whirl and oil whip at high rotational speed ...
Yasuhisa SEKIGUCHI, Ryutaro MATSUDA, Masahiro OKAMI, Osami MATSUSHITA   +3 more
doaj   +1 more source

Efficient NiOx Hole Transport Layers Enabled by Multifunctional MXenes for High‐Performance Tin‐Lead Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
An efficient NiOx HTL is successfully prepared by introducing MXene as an additive without further surface modification to fabricate high‐performance FASn0.5Pb0.5I3 perovskite solar cells. The introduction of MXene contributes to improved conductivity of NiOx, better aligned at NiOx/perovskite interfaces, and enhanced quality of perovskite films ...
Lijun Chen, Guanqi Tang, Yanghou Wang, Xiaolong Cao, Junjun Jin, Jie Tang, Liyang Yu, Zheng Zhou, Peng You, Hanlin Hu, Weiqing Yang, Qidong Tai, Feng Yan   +12 more
wiley   +1 more source

Actuating mechanism and design of a cylindrical traveling wave ultrasonic motor using cantilever type composite transducer. [PDF]

PLoS ONE, 2010
BACKGROUND: Ultrasonic motors (USM) are based on the concept of driving the rotor by a mechanical vibration excited on the stator via piezoelectric effect.
Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun Shi   +3 more
doaj   +1 more source

Femtosecond study of the effects of ions on the reorientation dynamics of water

, 2012
We study the effects of ions on the reorientation dynamics of liquid water with polarization-resolved femtosecond mid-infared spectroscopy. We probe the anisotropy of the excitation of the O-D stretch vibration of HDO molecules in solutions of NaCl, NaI ...
Bakker, Huib J., Scheidelaar, Stefan, van der Post, Sietse T.   +2 more
core   +1 more source

Multistability and localization in forced cyclic symmetric structures modelled by weakly-coupled Duffing oscillators [PDF]

, 2018
Many engineering structures are composed of weakly coupled sectors assembled in a cyclic and ideally symmetric configuration, which can be simplified as forced Duffing oscillators.
Ciavarella, M., Fontanela, F., Grolet, A., Hoffmann, N., Papangelo, A.   +4 more
core   +6 more sources

From Single Atoms to Nanoparticles: Pathways Toward Efficient and Durable Pt/TiO2 Photocatalysts

Advanced Functional Materials, EarlyView.
Platinum single atoms on TiO2 nanosheets evolve into clusters and nanoparticles under ethanol photoreforming and thermal treatments. By controlling deposition and post‐treatments, particle size and location on specific facets are modulated. The study reveals how stability pathways determine efficiency, guiding the design of more durable photocatalysts.
Juan José Delgado, Enqi Bu, Yaning Han, Carlos López‐Cartes, Mónica Calatayud, Huiyan Pan, Xiaowei Chen   +6 more
wiley   +1 more source

Self-Excited Vibration Analysis for the Feed Support System in FAST

International Journal of Advanced Robotic Systems, 2014
China is currently building the largest single dish radio telescope in the world, which is called the Five-hundred meter Aperture Spherical radio Telescope (FAST). The feed support system in the FAST is composed of a cable-driven parallel manipulator, an
Xiaoqiang Tang, Zhihua Liu, Zhufeng Shao, Liping Wang   +3 more
doaj   +1 more source

Nonlinear Self-Excited Vibration Mechanism for Under-Actuated Oil-Well Drilling System with Stick-Slip Vibration

Xibei Gongye Daxue Xuebao, 2019
Exploration of oil or gas wells is usually carried out by using drilling system. When the kilometers of drilling system is externally disturbed, the drilling system is prone to undesired stick-slip vibration of the drill-string.

doaj   +1 more source