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Microfluidic chip for performing multiphase (liquid/gas) reactions with heterogeneous catalysis. (a) Photograph of chip. This system was used for the hydrogenation of alkenes to form alkanes. The channel structures are in silicon. The heater and…

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from article Microfluidics

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from article Microfluidics

Flow profiles at a solid boundary (a) with no slip and (b) with slip.

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from article Microfluidics

Flows in microchannels. (a) Diagram of a section of a microchannel with a square cross section. (b) Flow profile of a pressure-driven flow and (c) an electroosmotic flow in a channel. The two series of fluorescent micrographs show the evolution of a…

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from article Microfluidics

Passive micromixer. (a) Section of a microchannel with grooves in the form of asymmetric herringbones on the bottom wall; the grooves lead to mixing in pressure-driven flows through the channel. One mixing cycle is made up of two regions of…

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from article Sound-reproducing system

Loudspeakers influence the sound of recordings while they are being made, and then those recordings are used to evaluate other audio products, including loudspeakers. Subjective evaluation, used alone, is a flawed process.

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from article Sound-reproducing system

Some important reference sound levels relating to what is recorded and what is heard.

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from article Sound-reproducing system

Just-audible deviations in a measured frequency response when the program material is a complex orchestration in a reverberant space. From left to right are shown deviations caused by a high-Q, a medium-Q, and a low-Q resonance. The magnitudes of…

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from article Sound-reproducing system

Evolution of multichannel audio. (a) Two-channel stereophonic reproduction. (b) Quadraphonics. (c) 5.1-channel “home theater.” The larger loudspeaker symbol is a subwoofer. (d) 7.1-channel multichannel movie and music entertainment system.

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from article Chemical dynamics