Results 31 to 40 of about 22,198 (264)

Electronic control of elastomeric microfluidic circuits with shape memory actuators [PDF]

, 2008
Recently, sophisticated fluidic circuits with hundreds of independent valves have been built by using multi-layer soft-lithography to mold elastomers.
Adalian, Dvin, Martin, Sujitha, Scherer, Axel, Sitaula, Suresh, Vyawahare, Saurabh   +4 more
core   +1 more source

Molecular biology on a microfluidic chip [PDF]

, 2006
We have developed microfluidic chips for automating molecular biology processes such as gene ligation and gene transformation from nanolitre sample volumes with parallel architecture. Unlike conventional tube methods with cumbersome pipetting procedures,
Anderson, W. French, Chen, Yan, Hong, Jong Wook, Quake, Stephen R.   +3 more
core   +1 more source

Optomechanical zipper cavity lasers: theoretical analysis of tuning range and stability [PDF]

, 2009
The design of highly wavelength tunable semiconductor laser structures is presented. The system is based on a one dimensional photonic crystal cavity consisting of two patterned, doubly-clamped nanobeams, otherwise known as a "zipper" cavity.
Björk, Bruce, Camacho, Chan, Coldren, Day, Diehl, Eichenfield, Eichenfield, Hard, Haus, Hill, Huang, Hwang, Johnson, Kippenberg, Kippenberg, Kitamura, Lee, Lin, Liu, Liu, Liu, Maboudian, Matsui, Moreau, Oskar Painter, Perahia, Raviv Perahia, Rice, Rosenberg, Seo, Sillanpaa, Slusher, Srinivasan, Srinivasan, Stintz, Tas, Thiago P. Mayer Alegre   +38 more
core   +2 more sources

Energy management in pump-controlled actuators

Frontiers in Mechanical Engineering
Pump-controlled actuators, or more generically, hydrostatic actuators, have the significant advantage of not relying on valves to control the cylinders. This results in much better energy usage compared to traditional valve-controlled systems. However, it is possible to further increase energy efficiency by storing load energy in motoring quadrants and
Gustavo Koury Costa, Nariman Sepehri
openaire   +2 more sources

A Class of Energy Efficient Self-Contained Electro-Hydraulic Drives with Self-Locking Capability

Energies, 2019
Pump controlled and self-contained electro-hydraulic cylinder drives may improve energy efficiency and reduce installation space compared to conventional valve solutions, while being in line with the trend of electrification.
Lasse Schmidt, Søren Ketelsen, Morten Helms Brask, Kasper Aastrup Mortensen   +3 more
doaj   +1 more source

A centrifugo-magnetically actuated gas micropump [PDF]

, 2006
This paper describes a novel gas micropump on a centrifugal microfluidic platform. The pump is integrated on a passive and microstructured polymer disk which is sealed with an elastomer lid featuring paramagnetic inlays.
Ducrée, Jens, Haeberle, S., Schmitt, N., Zengerle, Roland   +3 more
core   +1 more source

A Complete Analysis for Pump Controlled Single Rod Actuators

, 2016
In the current study a variable speed pump controlled hydrostatic circuit where an underlapped shuttle valve is utilized to compensate the unequal flow rate of a single rod actuator is analyzed. Parameters of the shuttle valve are included in the system analysis, rather than treating it as an ideal switching element as handled in literature.
Çalışkan, Hakan, Balkan, Tuna, Platin, Bülent E.   +2 more
openaire   +2 more sources

Control and ultrasonic actuation of a gas-liquid interface in a microfluidic chip

, 2009
This article describes the design and manufacturing of a microfluidic chip, allowing for the actuation of a gas-liquid interface and of the neighboring fluid. A first way to control the interface motion is to apply a pressure difference across it.
Brennen C E, Daniel Attinger, de Gennes P-G, Deshmukh A A Liepmann D Pisano A P, Eisenmenger W, Faber T E, Jie Xu, Kao J Warren J Xu J Attinger D, Kundu P K, Leighton T G, Lide D R, Papavasiliou A P Liepmann D Pisano A P, Yang L-J   +12 more
core   +1 more source

Deviation from the normal mode expansion in a coupled graphene-nanomechanical system [PDF]

, 2016
We optomechanically measure the vibrations of a nanomechanical system made of a graphene membrane suspended on a silicon nitride nanoresonator. When probing the thermal noise of the coupled nanomechanical device, we observe a significant deviation from ...
Arcizet, Olivier, Bendiab, Nedjma, Bouchiat, Vincent, de Lépinay, Laure Mercier, Kalita, Dipankar, Kuhn, Aurélien, Marty, Laëtitia, Pigeau, Benjamin, Schwarz, Cornelia   +8 more
core   +2 more sources

Charge pump controller for grounded piezoelectric actuators used in precise positioning

Electronics Letters, 2011
A charge pump controller adapted for grounded piezoelectric loads is proposed. By transferring charge packets into the piezoelectric actuator step by step, the actuator deforms with much less hysteresis and ultra-high resolution. Compared with voltage drive, the actuator hysteresis is reduced by 71-83- over a frequency range of 0.01-0.1-Hz.
Y.T. Ma, Z.H. Feng, L. Huang, L.S. Zhang
openaire   +1 more source