Engineering

Scalable manufacturing of integrated optical frequency combs

A collaboration between EPFL and UCSB has developed a long-anticipated breakthrough, and demonstrated CMOS technology—used for building microprocessors and memory chips—that allows wafer-scale manufacturing of chip-scale ...

Engineering

Caltech Hall is getting stiffer, according to decades of data

Caltech Hall, a 55-year-old nine-story reinforced concrete building on the Caltech campus, has been getting structurally stiffer over the past 20 years, according to a new report published in The Seismic Record.

Engineering

Sounding out a new way to measure gas flow

Researchers at NIST have developed a new—and sound—way to accurately measure the rate at which gas flows in and out of a vessel. The technique, which uses acoustic waves to determine the average temperature of the gas ...

Engineering

Scientists devise Kibble dynamic force reference

Static force, such as the weight of a person standing motionless on a bathroom scale or the force that an office full of equipment exerts on a high-rise floor, can be easily determined using scales, balances, load cells, ...

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Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period (the interval between beats) is half a second.

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