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Submission + - US Nuclear Weapons Laboratory Discovers How to Suppress the Casimir Force (medium.com)

KentuckyFC writes: One of the frustrating problems with microelectromechanical devices or MEMs is that the machinery can sometimes stick fast, causing them to stop working. One of the culprits is the Casimir effect--an exotic force that pushes metallic sheets together when they are separated by tiny distances. Now physicists at the Los Alamos National Laboratory in New Mexico have worked out and demonstrated how to suppress the Casimir force. The trick is to create a set of deep grooves and ridges in the surface of one sheet so that the other only comes close to the tips of the ridges. These tips have a much smaller surface area than the flat sheet and so generate much less force. That could help prevent stiction in future MEMs devices. But why would a nuclear weapons lab be interested? MEMs devices are invulnerable to electromagnetic pulse weapons that fry transistor-based switches.and so could be used as on-off switches for nuclear devices.

Submission + - Diamond rain in Saturn (telegraph.co.uk)

Taco Cowboy writes: Back on 1999 it was postulated that diamonds may rain from the sky in Saturn and Jupiter.

www.spacedaily.com/news/carbon-99d.html

New research has shown that diamond rains on Saturn is more than probable.

http://www.universetoday.com/105420/jupiter-and-saturn-may-be-rich-in-diamonds/

"

We don't want to give people the impression that we have a Titanic-sized diamondberg floating around ," said researcher Mona Delitsky, of California Specialty Engineering, " We're thinking they're more like something you can hold in your hand. "

Recent data compiled by planetary scientists Mona L. Delitsky of California Specialty Engineering in Pasadena, California, and Kevin H. Baines of the University of Wisconsin-Madison, has been combined with newly published pressure temperature diagrams of Jupiter and Saturn. These diagrams, known as adiabats, allow researchers to decipher at what interior level that diamond would become stable. They also allow for calculations at lower levels – regions where both temperature and pressure are so concentrated that diamond becomes a liquid. Imagine diamond rain or rivulets of pure gemstone.

While the idea of diamonds at the heart of planets like Uranus and Neptune has been known for at least three decades, planetary scientists have been hesitant to include Jupiter and Saturn, concluding they were either too cool, too hot, or otherwise not suitable for the production of solid diamonds. Just as Jupiter and Saturn are much warmer at their cores, Uranus and Neptune are much too cold to sustain diamonds in a liquid state. However, thanks to the latest data, researchers are confident that deep inside Saturn there may be diamonds so large that they could be referred to as diamondbergs

Diamonds may fall from the sky on the gas giants Jupiter and Saturn.

Astrophysicists have calculated that the conditions on the two biggest planets of the solar system are enough to produce stable oceans made from diamond.

They claim that powerful lightning storms in the planets’ atmospheres cause particles of carbon to form, which then drift down though the gas.

As the carbon falls, it is crushed by the enormous pressures that exist on the two planets, causing them to form dense chunks of diamond.

At even greater depths, the scientists say the diamond will eventually melt to form liquid diamond, which may then form a stable ocean layer.


Bug

Nvidia Problems Hit HP Desktops 141

Barence writes "HP has revealed faults with 38 different models in its slimline PC range, sparking speculation that Nvidia's faulty GPU problems have spread beyond laptops. HP's official statement says the problems are 'attributable to the computer's motherboard" and that affected machines 'may not boot or may not display video' — the same kind of terminology used to describe the previous faults with laptop GPUs. Both HP and Nvidia have declined to comment. But in a filing to the US Securities and Exchange Commission (SEC) earlier this year, Nvidia admitted 'there can be no assurance that we will not discover defects in other MCP or GPU products.'" Note: the linked story (updated since this submission) says that Yes, the problems are now confirmed to be rooted in the Nvidia GPUs.

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