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New tools for brain surgery

Unlike other instruments, the invention does not require any sharp blades or cumbersome power sources (such as those needed for ultrasound devices) in the operating theatre. Instead, a small paddle rotates at high speed, converting the tissue into a liquid form that can be removed by a small vacuum pump attached to the instrument. By […]

New tools for brain surgery

New light on plasma properties

Previous experiments found it difficult to measure plasma spectra because the high temperatures inside the plasma caused the spectral lines to blur. The Weizmann team solved the problem by adding oxygen ions to the plasma: these ions are less disturbed by the heat and density inside the plasma and produce clear spectral lines. Maron’s team […]

New light on plasma properties

Computers from chaos

It has been know for sometime that nature follows chaotic patterns that seem to allow organisms to respond to rapid changes in their environment. Sinha and Ditto have taken these equations further to form the basis of crude computer instructions. They defined a one-dimensional lattice of logistic maps in the form f(x) = ax(1-x), where […]

Computers from chaos

SOHO is safe

Luckily, SOHO drifted back into sunlight long enough to recharge its solar cells for communications with Earth, and in the past month the fuel has been heated from -100 C to 10 C. Engineers had to be careful not to rupture the tanks while heating the fuel. The tanks have survived so far and the […]

SOHO is safe

Trapping breakthrough for molecules

Many of the optical and magnetic techniques used to trap and cool atoms do not work with molecules because they have complex internal energy levels. Instead Doyle and his colleagues chilled the molecules by cooling the walls of a container filled with a mixture of helium atoms and calcium monohydride molecules. The molecules were cooled […]

Trapping breakthrough for molecules

Physics top ten

Brief History of Time : From the Big Bang to Black Holes by Stephen Hawking The author explores the outer reaches of our knowledge of astrophysics and the nature of time and the universe, and reviews the great theories of the cosmos, from Galileo and Newton to Einstein and Poincare. BUY THE BOOK: Amazon (US) […]

Physics top ten

Lasers, chaos, and bow-ties

Laser technology has come a long way since the 1960s. The very earliest lasers, such as ruby and helium-neon devices, were formidable contraptions. They relied on dilute active media with discrete energy levels such as gases or dopant ions scattered in a solid, external pumping mechanisms such as bulky coiled flashlamps or auxiliary gases excited […]

Lasers, chaos, and bow-ties
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