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Corals don't tan

11.08.2000

Employees of the Australian Institute of Marine Sciences have created a new, highly effective sunscreen based on substances secreted by corals. Since it uses natural compounds, it does not cause allergies.

Coastal corals, staying on dry land for several hours twice a day at low tide, might suffer greatly from the sun's ultraviolet rays, but they secrete special compounds that protect against burns. These so-called mycosporine-like amino acids effectively absorb and scatter ultraviolet light. But their molecules are very unstable.

It took almost ten years to work on obtaining similar, but stable compounds. In the molecules of mycosporin-like amino acids, chemists alternately replaced some of the atoms, striving to preserve the beneficial properties of the molecules and eliminate the instability. After testing hundreds of versions of the molecules, this was achieved.

The release of the new cream has already been launched by an Australian cosmetics company.

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TI UCC28070 controller 24.12.2007

Texas Instruments Inc. announced the release of a new UCC28070 two-phase controller with average current control for communication, server and industrial systems with multi-kilowatt power consumption.

It simplifies the power supply design process, improves system reliability, and achieves a power factor greater than 0,9, which improves energy efficiency. The UCC28070 controller helps reduce total harmonic distortion in mains-powered systems 75 W...1 kW and above. It also allows today's systems to make the most of available power from the mains and to accommodate extreme disturbances in AC networks with varying voltage levels.

The UCC28070 helps improve system reliability with a 180° phase sequence method that reduces input and output current fluctuations by 50% to 100% and redistributes magnetic fields to improve heat transfer. The frequency spreading feature of the UCC28070 helps to reduce the capacitance and allows the use of a smaller and less expensive EMI filter.

An over-voltage protection circuit with an open-loop detection function protects the system from damage to the circuit board. In addition, the UCC28070 controller provides undervoltage lockout, step-by-step overcurrent limiting, and system overtemperature protection.

The UCC28070 comes in a 20-pin TSSOP package.

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