Results 41 to 50 of about 8,814 (267)

Scalable ω‐Substituted α‐Olefins via Living Chain Transfer Telomerization: A Platform for Next Generation Polyolefins

Angewandte Chemie, EarlyView.
A highly versatile and general strategy is presented for the scalable production of practical quantities of ω‐substituted α‐olefins using tris(ω‐substituted alkyl)aluminum telogens that are readily available through a “green” synthesis from commodity triisobutylaluminum and ethene as the taxogen. These new α‐olefins can be designed and used as monomers
Lauren G. Logue, Cole M. Burrows, Vince J. Wedekind, Hyunku C. Kim Jr., Lawrence R. Sita   +4 more
wiley   +2 more sources

Impact of Frog Height Deviations on Dynamic Response of High-Speed Metro Trains Negotiating Turnouts

Shock and Vibration
Composite frogs inevitably have manufacturing or installation errors, leading to deviations in the height of the frogs, which affects the dynamic performance of trains passing through turnouts.
Dongliang Zeng, Shan Jin, Fei Chen, Xiaoyu Hu, Xiuqi Wei, Kaiyu Zeng, Wang Kaiyun, Chang Li   +7 more
doaj   +1 more source

Analysis of modal frequency optimization of railway vehicle car body

Advances in Mechanical Engineering, 2016
High structural modal frequencies of car body are beneficial as they ensure better vibration control and enhance ride quality of railway vehicles. Modal sensitivity optimization and elastic suspension parameters used in the design of equipment beneath ...
Wenjing Sun, Jinsong Zhou, Dao Gong, Taiwen You   +3 more
doaj   +1 more source

Biomimetic Self‐Reconfigurable Soft Gripper for Cross‐Scale, Multi‐Particle, and High‐Load Multifunctional Manipulation

Advanced Science, EarlyView.
A fully soft, self‐reconfigurable gripper inspired by rapeseed flowers is monolithically 3D‐printed and electronics‐free, switching between diagonal and parallel finger arrangements. Establishing a self‐reconfigurable grasping paradigm, the gripper enables diverse manipulation tasks, including rotating bulbs, picking fruits, grasping cross‐scale ...
Qiping Xu, Bin Wang, Jinxin Chen, Zhengqiang Guo, Baisong Yang, Chaoqian Chen, Jiancheng Cai, Chee‐Meng Chew, Shiju E   +8 more
wiley   +1 more source

A Fault Diagnosis Method for Planetary Gearboxes Based on IFMD

Shock and Vibration
The vibration signal from the planetary gearbox exhibits nonlinear and impulsive characteristics amidst strong noise, impeding the effective extraction of fault information and compromising the accuracy of fault diagnosis.
Fengfeng Bie, Xueping Ding, Qianqian Li, Yuting Zhang, Xinyue Huang   +4 more
doaj   +1 more source

Bio‐Inspired Bidirectional Winding Origami With Programmable Modular Reconfigurability and Scalability

Advanced Science, EarlyView.
A bio‐inspired bidirectional‐winding origami platform enables scalable and programmable deployable structures. Double axial folding inspired by earwig hindwings and Flasher‐based hybridization create modular multilayer architectures with diverse attainable winding angles under fixed boundary conditions.
Wenyao Zhang, Chunlong Wang, Mingli Liu, Chuang Shi, Hongwei Guo, Rongqiang Liu   +5 more
wiley   +1 more source

Selective Polarity Control of Metal Oxide Semiconductors for Complementary Logic Gates

Advanced Science, EarlyView.
A scalable electrochemical doping strategy enables in situ p‐to‐n polarity conversion in tin oxide (SnO) thin films using electrolyte gating. Both the pristine p‐type SnO transistor and the electrochemically converted n‐type SnO2 transistor exhibited noticeable and stable electrical performance.
Dong Hyun Park, Seung Ho Ryu, Min Su Kim, Taek‐Mo Chung, Seong Keun Kim, In‐Hwan Baek, Keun Hyung Lee   +6 more
wiley   +1 more source

Rail Corrugation Characteristics of Cologne Egg Fastener Section in Small Radius Curve

Shock and Vibration, 2020
By analyzing the measured data of rail corrugation in a small radius curve track with Cologne fasteners, the typical passing frequencies of corrugation were obtained.
Zhiqiang Wang, Zhenyu Lei, Yang Zhao, Yao Xu   +3 more
doaj   +1 more source

Nanoparticle‐Mediated Bubble Suppression During Droplet Solidification for Mechanical Reinforcement

Advanced Science, EarlyView.
Nanoparticles mediate droplet solidification by raising nucleation temperature, refining dendrites, and slowing freezing‐front advance, thereby suppressing trapped air bubbles in droplet‐based 3D printing. This strategy reduces bubble volume fraction by ∼35% and increases compressive strength by up to 39%, offering a low‐cost route to stronger printed ...
Runmiao Gao, Xuan Zhang, Mengjie Song, Ronggui Yang, Keke Shao, Jun Shen, Long Zhang, Shuhuai Yao, Yubing Guo, Ruzhu Wang, Christopher Yu Hang Chao   +10 more
wiley   +1 more source

Vibration Analysis of Traction Drive System Components Based on the Field Test for High-Speed Train

Journal of Advanced Transportation, 2023
The traction drive system of a high-speed train is the key subsystem of a high-speed train, which controls the driving and braking of the train through electromechanical coupling, and determines the running speed, power quality, and comfort of the train.
Pingbo Wu, Chunyuan Song, Xun Wang, Sheng Qu, Hao Wu   +4 more
doaj   +1 more source