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Great Way To Get More Efficient Solar Power for Batteries

College of southern California experts show us a more efficient use of graphene solar panels

Could you imagine people powering their cellular phone or music/video device while jogging on a sunny day?

A University of Southern California team has produced flexible transparent carbon atom films that may have great potential for a brand new variety of solar cells.

In a paper recently published by the journal ACS Nano, researchers stated that organic photovoltaic (OPV) cells have been proposed as a technique to achieve cheap energy due to their ease of manufacture, light weight, and compatibility with flexible substrates.

The new work indicates that graphene, an extremely conductive and highly transparent kind of carbon composed of atoms-thick sheets of carbon atoms, has high possibility to fill this role.

While graphene’s existence has been known for decades, it has only been studied extensively since 2004 because of the impossibility of manufacturing it in high quality and quantity.

The University of southern California team has produced graphene/polymer sheets ranging in sizes approximately 150 square centimeters that in turn can be used to create dense arrays of flexible organic photovoltaic (OPV) cells.

These organic photovoltaic (OPV) devices convert solar radiation to electricity, but not as efficiently as silicon cells.

The power provided by sunlight on a sunny day is approximately 1,000 watts per meter square, for every 1,000 watts of sunlight that hits a square meter part of the standard silicon solar cell, 14 watts of electricity will be generated, Organic solar cells are less efficient; their conversion rate for that same 1,000 watts of sunlight in the graphene-based solar cell would be only 1.3 watts.

But what graphene organic photovoltaic (OPV) lack in efficiency, can potentially be compensated by its lower price and, greater physical flexibility.

Researchers think it can eventually be possible to cover with inexpensive solar cell layers extensive areas like newspapers, magazines or power generating clothing.

In the meanwhile Prof. Ruoff and his colleagues of the mechanical engineering department at the University of Texas at Austin, are studying the basic science in the development of graphene-based ultracapacitors for usage in electronics and other fields.

Prof. Ruoff says batteries are relatively slow, they can store energy but take a while to charge up, and then they distribute energy slowly, over time.

Ultracapacitors can be charged very quickly, in seconds, and discharge quickly, but, today, they can’t store very much electrical energy.

The development of stable and cheaper ultracapacitors could be a key step in using wind or solar-generated power, especially if researchers will find ways to enable capacitors to store energy longer, that is not yet possible.

Even with their current storage capacity, the graphene devices could provide quick energy when needed in certain situations on the environmentally friendly way.

They can be used, as an example, to absorb the heat generated in braking an automobile or train, and store it for a short time, and then use it for the electrical needs of the vehicle (i.e. starting the vehicle or acceleration)

About the Author – Sophia H. Walker writes for the solar powered battery charger blog, her personal hobby blog related to tips to help people save electricity using solar energy for small gadgets.

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HTC starts 2010 with a profitable first quarter

According to the HTC’s financial report for the first quarter of 2010 the company is doing quite well. They’ve announced approximately 1.2 billion US dollars of revenue and that obviously is better than what they projected.

That makes 19.3 percent more than what HTC earned last year’s Q1.

The Q1 net profit, however, is ca. 160 million US dollars, which is 8 percent lower compared to the same first quarter of 2009.

Nevertheless, those numbers are far beyond expectations since the Taiwanese company expected revenues between 1.01 and 1.08 billion US dollars.

And when it comes to the earnings per share, they are about 0.2 US dollars which is by 10 to 20 percent more than expected.

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iPad Unboxing

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Porsche Design P’9522 Black Edition

Porsche owners are a rare breed and the same can be said of the Porsche Design P’9522 Black Edition phone. With its S$2,280 (US$1,628.57) price tag, the P’9522 isn’t the handset meant for the average Joe. It’s milled from a block of aluminum and has the requisite number of radios including quad-band GSM, Wi-Fi, Bluetooth, GPS and FM receiver to make us raise an eyebrow for a device of this caliber. However, the frustrating touchscreen user interface killed all our enthusiasm for this phone.

Design

A lot of times in the design of a handset, it can get away with either looking elegant like the iPhone or have a chassis machined from precious materials like a Vertu. The Porsche Design P’9522 is, unfortunately, neither. It’s solid, that much we concede as it feels like we’re dropping a block of aluminum when we put the handset down on the desk. The smooth brushed aluminum back with laser-etched text is a stark contrast to the less slippery glossy front when held in the hands.

The words “Porsche Design” are inscribed above the 2.8-inch AMOLED display. Below are the Call and End keys with a gold-strip sensor between. Combined, this vaguely resembles a car’s frontal view if we imagine hard enough. Further down are four rows of blade-thin lines which form your numeric keypad. We’d hesitate to call these buttons as they are really not, both in size and tactility. We don’t think we have fat thumbs, but it takes only one to nearly obscure two-thirds of the pad which makes it frustrating to even type a short message without having to use the tips of our nails.

On the sides you can find the proprietary cable connection, camera shutter and volume controls that are surprisingly usable. Around back are the 5-megapixel camera, LED light and onboard speakers. A handsfree earpiece, 2GB microSD card, travel charger, software CD, warranty card and documentation are included in the bundle.

Features

The P’9522 doesn’t let you unlock your Porsche or fire up its engines, even though we were secretly hoping that Porsche would include these features to differentiate it from the premium Nokia devices and the Vertus. Call us shallow, but which geek won’t fancy such cool tricks?

There are quad-band GSM radio, GPS, Bluetooth A2DP and Wi-Fi radios built-in, but we were soon disappointed by an absurd touchscreen user interface which was probably one of the worst we’ve encountered. You cannot tap an item on a list to open it. Instead you’ll either have to scroll to that option and tap another button to activate, or hit the corresponding number on the keypad. Scrolling in the menus was also nothing less than a frustrating experience. The highlight bar goes off way too fast (perhaps it’s a Porsche thing) and we ended up missing the intended option all the time. Even unlocking the phone was an unusually cumbersome three-step process. You hit the End key to activate the screen, then press * to bring up the Validate option, and then tap on it to finally unlock the device. Throw a nearly non-usable keypad on top of all these, and we have a handset that barely fulfills its basic calling.

This Porsche has one thing that’s unique though, and that’s its fingerprint sensor. But even with that, we felt half-hearted about it after a while. It’s a neat feature that lets us map our fingers to 10 specific phone actions, but the learning curve was plenty steep. We had to remember which digit did what, once we got past the multiple steps required to modify the fingerprint database onboard and the messy interface.

Java applications such as the Opera Mini browser and Wayfinder Navigator come preinstalled, but they were somewhat handicapped by the less-than-intuitive touch interface on the P’9522. There’s also no email support on this device, which didn’t bother us as much anymore halfway through our review.

The 5-megapixel camera, on the other hand, had quite a few features. We could geotag images, adjust white balance, color effects, timer and toggle the macro mode. Shutter lag was measured at 0.7 second, which was slower than the average camera-phone, so hold your P’9522 steady even after you press the shutter. As for image quality, colors were washed-out both in our Lab test shots and outdoor snaps. The autofocus was unreliable, which resulted in many blurry snaps.

Performance

The 880mAh lithium-ion battery is rated for up to 4 hours of talktime and 12.5 days on standby. If we used it for only calling and short texting, we reckon it’d be able to last at least two full days. There are equalizers and sound effects for the music player, but that did little for the audio quality of the P’9522. Fortunately, call quality was crystal-clear via the earpiece and onboard speakers.

Conclusion

When the Porsche Design P’9522 Black Edition was launched in Singapore a couple of weeks earlier, the company said there would be only 100 pieces available. In hindsight, that’s 100 too many considering the sticker shock of S$2,280 (US$1,628.57) doesn’t quite justify the fact that the handset doesn’t even get the crucial basics of a touchscreen phone right. A premium Nokia Arte or Sirroco would make better choices, or if you can afford it, a Vertu can be had for about twice the price with less grief using it and free concierge service thrown in for a year.

Damian Koh

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SanDisk to start selling 32GB microSD cards next month

The new crop of microSD cards are getting ridiculous storage capacities for something this small – step back 16GB microSD cards, the 32GB cards are coming to town. SanDisk just might be the first to release microSD cards of this capacity.

By the way, this is the Swan song of microSDHC – they are capped at 32GB capacity. Coming to replace them will be the microSDXC variety (XC stands for “extended capacity”).

Getting back on topic, SanDisk will release the world’s first 32GB microSD cards next month and their price is expected to be 200 US dollars (150 euro), which obviously includes he early adopter’s fee and the bragging rights that come with it.

We’re joking of course, but 16GB microSD cards from SanDisk can be had for as low as 40 bucks – buying a phone with a hot-swappable card slot sounds like a good idea, doesn’t it?

But if you absolutely must have one, you’d need 200 dollars by next month when these cards start shipping.

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