Results 261 to 270 of about 58,986 (291)
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Robust autothermal microchannel reactors
Computers & Chemical Engineering, 2014Abstract Autothermal microchannel reactors are intensified process units that bring significant energy efficiency benefits over their conventional counterparts. Efficiency gains are obtained, however, at the cost of operational challenges. These stem from the loss of control handles that is inherent to combining several unit operations in a single ...
Richard C. Pattison, Michael Baldea
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Chaotic Mixer for Microchannels
Science, 2002It is difficult to mix solutions in microchannels. Under typical operating conditions, flows in these channels are laminar—the spontaneous fluctuations of velocity that tend to homogenize fluids in turbulent flows are absent, and molecular diffusion across the channels is slow.
Abraham D, Stroock +5 more
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Virtual Walls in Microchannels
2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006Microfluidic channels were studied, in which the surface is modified from a solid/liquid interface into solid/liquid and air/liquid alternating interface, creating the equivalent of a superhydrophobic surface on the interior of the channel. The composite microchannel can be easily fabricated using embossing or cast molding of PDMS.
Wei, Xu +3 more
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Physics Today, 1977
For more than forty years researchers have applied the phenomenon of photoemission to convert absorbed incident radiation into an electron stream, which is then amplified by a secondary-emission process. The resulting fast high-gain photon detectors, such as photomultipliers and electron multipliers, are among the fastest and most sensitive devices for
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For more than forty years researchers have applied the phenomenon of photoemission to convert absorbed incident radiation into an electron stream, which is then amplified by a secondary-emission process. The resulting fast high-gain photon detectors, such as photomultipliers and electron multipliers, are among the fastest and most sensitive devices for
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Bubble dynamics in microchannels. Part I: single microchannel
International Journal of Heat and Mass Transfer, 2004Abstract The present work explores experimentally bubble dynamics in a single trapezoid microchannel with a hydraulic diameter of 41.3 μm. The fabrication process of the microchannel employs a silicon bulk micromachining and anodic bounding process.
P.C. Lee, F.G. Tseng, Chin Pan
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Electroosmotic mixing in microchannels
Lab on a Chip, 2004Mixing is an essential, yet challenging, process step for many Lab on a Chip (LOC) applications. This paper presents a method of mixing for microfluidic devices that relies upon electroosmotic flow. In physical tests and in computer simulations, we periodically vary the electric field with time to mix two aqueous solutions.
Ian, Glasgow +2 more
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Applied Optics, 1977
We have investigated the manner in which the gain of a microchannel plate (MCP) changes as the plate is operated at moderate output currents. We find that the total charge per unit area Q (C-cm(-2)) extracted from the MCP is the relevant quantity for evaluating the performance of the MCP.
B R, Sandel +2 more
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We have investigated the manner in which the gain of a microchannel plate (MCP) changes as the plate is operated at moderate output currents. We find that the total charge per unit area Q (C-cm(-2)) extracted from the MCP is the relevant quantity for evaluating the performance of the MCP.
B R, Sandel +2 more
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Microchannel Plate Streak Camera
SPIE Proceedings, 1985The development of a streak camera using a microchannel plate electron multiplier as the cathode is presented. Potential applications to γ-rays, low-energy x-rays, and charged particles are described. Preliminary test shows that 150-ps resolution can be obtained.
C. L. Wang +5 more
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Particle Transport in Microchannels
Numerical Heat Transfer, Part B: Fundamentals, 2006A numerical model for particle transport in microchannel is presented. This article focuses on situations where the sizes of the particles are comparable to the sizes of the channels. The present approach is validated against (1) flow around stationary, (2) flow around forced rotating, (3) flow around freely rotating cylinders and (4) sedimentation of ...
Y. F. Yap +5 more
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Ultrasonic agitation in microchannels
Analytical and Bioanalytical Chemistry, 2004This paper describes an acoustic method for inducing rotating vortex flows in microchannels. An ultrasonic crystal is used to create an acoustic standing wave field in the channel and thus induce a Rayleigh flow transverse to the laminar flow in the channel. Mixing in microchannels is strictly diffusion-limited because of the laminar flow, a transverse
Martin, Bengtsson, Thomas, Laurell
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