Results 141 to 150 of about 2,840,980 (293)

O uso das luvas de proteção no corte manual da cana-de-açúcar

Revista Brasileira de Saúde Ocupacional
Uma negociação tripartite entre a Fundacentro, o Sindicato dos Empregados Rurais de Araraquara e a Usina Santa Cruz permitiu a realização do estudo sobre o uso dos equipamentos de proteção individual (EPI) e das ferramentas de trabalho durante a execução
Maria Cristina Gonzaga, Roberto Funes Abrahão, Oscar Antonio Braunbeck   +2 more
doaj   +1 more source

Detection of Simulated Tactile Gratings by Electro-Static Friction Show a Dependency on Bar Width for Blind and Sighted Observers, and Preliminary Neural Correlates in Sighted Observers. [PDF]

Front Neurosci, 2020
Vuong QC, Shaaban AM, Black C, Smith J, Nassar M, Abozied A, Degenaar P, Al-Atabany W.   +7 more
europepmc   +1 more source

A design of the electromagnetic driver for the "internal force-static friction" capsubot

, 2009
A capsule robot that moves utilizing the internal force between the shell and the sliding mass and the friction between the shell and the environment is named ¿internal force-static friction¿ capsubot.
Tan RJ(谭人嘉), Zhang C(张诚), Li HY(李洪谊), Su G(苏刚)   +3 more
core  

Breaking the Surface: Buoyant Metal–Polymer Open–Cell Hybrid Lattice Metamaterials

Advanced Materials, EarlyView.
Open‐cell metal–polymer lattice metamaterials that defy sinking. (a) Injection process of the polyurethane (PU) foam into the titanium (Ti‐6Al‐4V) hollow‐strut lattice creating the open‐cell Ti‐6Al‐4V+PU hybrid lattice, (b) flotation test of a hybrid lattice specimen, and (c) a digital representation and experimental validation of a marine buoy ...
Jordan Noronha, Joey Tallon, Raad Omar, Jason Dash, Andrey Molotnikov, Martin Leary, Milan Brandt, Ma Qian   +7 more
wiley   +1 more source

TESCLA: A Fully Soft Electromagnetic Linear Actuator With Continuous Bending Enabled by Liquid‐Metal Solenoids

Advanced Materials, EarlyView.
TESCLA (tubular electromagnetic soft conformal linear actuator) combines liquid‐metal solenoids and compliant magnetic composites to achieve large‐stroke bidirectional actuation with continuous bending. Integrated inductance‐based self‐sensing enables proprioceptive position estimation without external sensors, providing a versatile platform for soft ...
Yeongjin Choi, Jeongnam Kim, Seongjun Koh, Yong‐Lae Park   +3 more
wiley   +1 more source

Friction modeling from a practical point of view

Multibody system dynamics
Regularized static friction models have been used successfully for many years. However, they are unable to maintain static friction in detail. For this reason, dynamic friction models have been developed and published in the literature.
Matthias Schuderer, G. Rill, T. Schaeffer, Carsten Schulz   +3 more
semanticscholar   +1 more source

Inductively Expandable Supraparticles as Microscopic Force Generators for Remote Mechanical Actuation

Advanced Materials, EarlyView.
This study demonstrates the combination of magnetic nanoparticles and functional blowing agents into supraparticles. Upon induction heating, they actuate via rapid gas generation or extensive volume expansion. These supraparticles lift up to 25 000 times their own mass and rapidly open cured epoxy resins, providing a versatile strategy for fast micron ...
Leoni Luthardt, Stephan Müssig, Robert Luxenhofer, Karl Mandel   +3 more
wiley   +1 more source

Dynamic Electrophoretic Assembly Coupled With Water‐Splitting‐Induced pH Control Enables Precision Ion Sieving Membranes

Advanced Materials, EarlyView.
A green, external‐catalyst‐free route grows defect‐free covalent organic framework membranes directly on ion‐exchange supports using an alternating electric field and in situ‐generated acid. Through a self‐regulating, self‐healing mechanism, the membranes achieve near‐complete, ultra‐fast separation of monovalent ions such as Li+, Na+, and K+, offering
Mohammad Hossein Jandaghian, Petric Marc Ruya, Ipek Ozyurt, Ali Atyabi, Samuel Eyley, Wim Thielemans, Alexander Volodin, Riccardo Alessandri, Xing Yang   +8 more
wiley   +1 more source

Establishment and Parameter Calibration of a DEM-Based Contact Model for Leymus chinensis Seed–Straw Mixtures

Applied Sciences
The study of Leymus chinensis seed cleaning has been hindered by the lack of accurate discrete-element contact parameters for seed–straw interactions, thereby limiting, to some extent, the optimization of cleaning equipment.
Qihao Wan, Anbin Zhang, Wenxue Dong, Fei Liu, Yingsi Wu, Yin Qi, Yuxing Ren   +6 more
doaj   +1 more source

Investigation of HVOF-sprayed hardmetal coatings for static friction applications

, 2022
S.68-73Frictionally engaged joints are widely used in mechanical engineering and require a high static friction. Thermally sprayed hardmetal coatings have a high potential to fulfil this requirement.
Gerlach, Marco, Gräfensteiner, M., Spatzier, Jörg, Vidner, J., Gröger, Sophie, Schiefer, S., Berger, Lutz-Michael, Leidich, Erhard   +7 more
core