Results 71 to 80 of about 44,535 (316)

Semi-active damping control for vibration isolation of base disturbances [PDF]

, 2004
This thesis is concerned with semi-active damping control for vibration isolation of base disturbances. The aim is to investigate the effectiveness and suitability of semi-active damping control strategies for improving steady-state vibration isolation ...
Liu, Yuyou
core  

Development of a dynamic vibration absorber with adjustment mechanism of spring constant and damping coefficient

Nihon Kikai Gakkai ronbunshu
This paper proposes a simple passive device with an adjustment mechanism for spring constant and damping coefficient to realize a dynamic vibration absorber (DVA) that can be used for various vibration control target frequencies.
Manaya NAITO, Takahiro TOMIOKA, Takehiko TAKAHASHI   +2 more
doaj   +1 more source

Mechanical Behavior and Fracture Mechanisms of MXene/PVDF Nanocomponsites: In Situ Characterization and Multiscale Analysis

Advanced Functional Materials, EarlyView.
Multiscale experiments and modeling reveal how Ti3C2Tx MXene nanosheets reinforce PVDF nanocomposites. An optimal MXene loading (∼1 wt.%) nearly doubles tensile strength through efficient stress transfer, flake alignment, and crack‐deflection mechanisms, transforming ductile polymer behavior into a controlled multi‐stage fracture pathway which aligns ...
Bita Soltan Mohammadlou, James FitzPatrick, Li Meng, Kateryna Shevchuk, Ahmad Najafi, Yury Gogotsi   +5 more
wiley   +1 more source

Analysis of the energy harvesting performance of a piezoelectric bender outside its resonance [PDF]

, 2014
When the frequency of the source of vibration of a piezolectric generator is significantly different from its eigenfrequency, the dielectric power losses become prominent and decrease the amount of power which is practically harvested.
AMBERG, Michel, GIRAUD, Frédéric, DAWSON, Francis, GIRAUD-AUDINE, Christophe, LEMAIRE-SEMAIL, Betty, Amanci, Adrian, AMANCI, Adrien   +6 more
core   +1 more source

Omnipolar Magnetic Field Detection by Superlattice‐Based Hall Sensor

Advanced Functional Materials, EarlyView.
Magnetic‐field‐induced electronic switching is demonstrated in unit‐cell‐engineered La0.7Sr0.3MnO3–BiFeO3 superlattices. Distinct substrate terminations modify magnetic and transport properties. Hall resistance measurements show omnipolar, hysteretic anomalous Hall switching above the Curie temperature, arising from Fe─Mn interfacial exchange, enabling
Mark Huijben, Nicolas Gauquelin, Arno Annys, Zhaoliang Liao, Jo Verbeeck, Guus Rijnders, Gertjan Koster   +6 more
wiley   +1 more source

Methods of frequency tuning vibration based micro-generator

, 2009
A vibration based micro-generator is an energy harvesting device that couples a certain transduction mechanism to the ambient vibration and converts mechanical energy to electrical energy.
Zhu, Dibin
core  

A novel active vibration suppression device based on momentum wheel and pendulum-tuned mass damper

Journal of Low Frequency Noise, Vibration and Active Control
During the mass transfer process of micro-LEDs, equipment may be affected by low-frequency vibrations, leading to issues such as poor chip alignment accuracy and reduced yield rates.
Yunyang Huang, Jinglin Zhou, Liancai Shen, Haonan Li, Zhihang Lin, Zhihong Zhang   +5 more
doaj   +1 more source

Effects of Cold and Vibration on Venipuncture Pain Management in Children Aged 2-7 Years Old: Randomized Controlled Trial

JMIR Pediatrics and Parenting
BackgroundThe pain resulting from venipuncture is one of the primary sources of stress during childhood and can have adverse effects on children. The Buzzy device can play an important role in alleviating the pain of venipuncture in children.
Zi-yun Zhou, Long-yi Hu, Ming-li Wang, Si-qi Li, Le-shan Zhou   +4 more
doaj   +1 more source

X‐Functionality–Driven Photocatalytic Hydrogen Evolution in 2D 4‐X‐PEA2SnI4 Perovskites

Advanced Functional Materials, EarlyView.
We report a water‐based synthesis of 2D 4‐X‐PEA2SnI4 perovskite microcrystals with prominent photocatalytic (PC) activity for H2 production. The synergy between organic functionalization and HI‐derived iodide scavenges holes suppress octahedral distortion, and favor electron accumulation, enabling a PC H2 evolution ∼20 µmol·g−1 and long‐term stability ...
Taeyeon Kim, Gayoung Seo, Seong Yeon Park, Juwon Jang, Yunho Ahn, Samiksha Mukesh Jain, Samrat Das Adhikari, Harumi Correa‐Leiva, Ignacio Utreras‐Asenjo, Oscar A. Douglas‐Gallardo, Carina Pareja‐Rivera, Kayoung Cho, Byeongsung Kim, Jhonatan Rodriguez‐Pereira, Eunseo Choi, JaeHong Park, Jin Ho Bang, Danilo H. Jara‐Quinteros, Sixto Giménez, Seog Joon Yoon, Andrés F. Gualdrón‐Reyes, Iván Mora‐Seró   +21 more
wiley   +1 more source

Damping System Designs using Nonlinear Frequency Analysis Approach [PDF]

, 2012
The main purpose of this thesis focuses on the investigation of the frequency domain analysis and design approaches for nonlinear damping systems. With the development of modern mechanical and civil engineering structures, the vibration control has ...
Guo, Pengfei
core