Shock waves travel in straight lines, so when most bikes hit potholes, the shocks run through the frame and into the rider. One way to avoid the discomfort that can cause is to channel those vibrations onto another path, as the Tortola RoundTail road fram

Stars of the sky play a bit coy with their ages—an ancient star can often pass for a much younger one. That is a problem for astronomers seeking out habitable planets orbiting distant stars because a star’s age correlates with the life-forms it could support.

“We know from studying our own planet that sony np-fh50 battery if the star and the planet are about one billion years old, only the most primitive microbial life might exist,” said Søren Meibom of the Harvard-Smithsonian Center for Astrophysics at the May American Astronomical Society meeting in Boston. “Is it perhaps 4.6 billion years old? Well, all of a sudden we know we could have a planet teeming with complex and intelligent life.”

But, as Meibom put it, “stars do not have birth certificates.” And many visual attributes remain the same for most of a star’s life. One feature  thinkpad t410 battery, though, does change: stars spin more slowly as they grow old. “And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age,” Meibom said.

But first someone has to paint the numbers on the face of that clock. Researchers have already pinned down the relation between rotation and age for very young stars. So Meibom and his nikon d50 battery colleagues are measuring the rotation rates of older stars. If they can figure out the relation between age and rotation for many vintages of stars, a star’s age will be much easier to estimate. No birth certificate required.

 

A one-way system for light rays could allow optical computer chips to overtake their standard electronic counterparts. The new canon nb-2lh battery device should eventually help to improve the speed of data processing and ease Internet traffic.

 

Optical, or photonic, chips use light rather than an electrical current to carry information. State-of-the-art optical chips already transfer data at rates of around 10 gigabits per second--more than 100 times faster than the best electronic chips, says Liang Feng, an electrical engineer at the California Institute of Technology in Pasadena.

 

"That's the noticeable difference between a Google search samsung slb-11a battery you carry out today taking a few seconds to load, and a search being done in the future in less than a blink," he says.

 

For more than a decade, engineers have been working to make commercially viable optical chips, but to do so they need to come up with the optical equivalent of the electronic diode. This allows current to pass in only one direction, preventing back-scattered current from interfering with other sony dsr-200a battery components and the forward signal.

 

Such 'optical diodes' have been created in the past, but they either use materials that are incompatible with silicon or rely on acer btp-58a1 battery magnetic fields to block backward light1. "Unfortunately, you can't stick something magnetic near your computer or it will disrupt it," says Feng.

 

Guiding the ray

Feng and his colleagues have now created a silicon nikon d70 battery  waveguide--a slab with a rectangular cross-section measuring 200 nanometers thick and 800 nanometers wide--that channels light in only one direction. Standard waveguides allow waves to pass through in both directions, but Feng's team realized that adding extra layers of materials with different reflective and refractive properties, at specific points along the tunnel, could break this symmetry.

 

"It has been known for nikon d70s battery a long time that adding layers to the sides of waveguides can affect forward and backward motion, but it was tricky to calculate the particular structure that would manipulate the light just as we needed," says Feng.

 

Using calculations and computer simulations, the team hit on the right materials and pattern for a waveguide that would allow a forward-moving light wave to progress symmetrically--so that its peaks and troughs remain parallel--while disrupting the backward wave in such a way that its successive peaks and troughs deviate from the parallel. The solution involved adding a number of sinusoidal-shaped bumps of silicon sony np-fm50 battery, 40 nanometers thick, along one side of the waveguide, and similar bumps, made of a layer of germanium sandwiched with chrome, on the other side.

 

The team monitored the passage of light through the waveguide using a near-field scanning optical microscope and confirmed that a narrow beam of light successfully passes through the waveguide forwards, but that the wave's symmetry breaks down when traveling nikon d40 battery backwards2. The next step is to incorporate the waveguide into a device that filters out the asymmetric light. "We hope to have this completed soon," says Feng.

 

Nasser Peyghambarian, an optical scientist at the University of Arizona in Tuscon, says that the work is an "important step for building optical chips". But he adds that it may be another 15 years before a full range of optical components, including laser acer btp-58a1 battery sources and optical amplifiers, are ready to be integrated together: "Only then can we talk about using photonic chips in real commercial products."

 

Britons get average broadband speed of 6.2 megabits per second, less than half average advertised speed of 13.8Mb .High-speed broadband fibreoptics: Ofcom's report is based on 11 packages from UK's seven largest providers.

I’m currently wrapping up a review of the latest Honeycomb tablet, the Toshiba Thrive. Quick spoiler, it’s one of my favorite Android tablets yet, but I still wouldn’t buy it nor recommend it to anyone outside the dedicated Android fanbase. Just like the

We’ve written about Paul Adams a few times now. As a refresher, he’s the guy who used to work at Google on user experience and made a popular presentation that suggested how Google could go after Facebook in the social space — namely, friend groups. That,