Engineering

A 20 kW laser system for producing high-purity crystals

High-purity semiconductor crystals are required for power electronics in electric cars or in photovoltaics. When such crystals reach a diameter of 2 inches, they become relevant for industrial applications.

Energy & Green Tech

Why is it so hard to make batteries smaller and lighter?

Flat coin cell batteries (the kind used in watches) have been around for decades. But the combination of solid and liquid components makes it very hard to see how the components fail inside these batteries.

Security

Cyberattack keeps hospitals' computers offline for weeks

Key computer systems at hospitals and clinics in several states have yet to come back online more than two weeks after a cyberattack that forced some emergency room shutdowns and ambulance diversions.

Hardware

A gate driver for circuit bipolar transistor electronic switches

Many homes have electronic timers for automatically turning lights on or off automatically the same time each day. However, the precise control of larger electrical devices requires more sophisticated electronics. Scientists ...

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