Ipad 2 Review – The Apple Ipad Sequal

Sunday, July 31, 2011 in Articles

In these next few paragraphs i will be outlining the features and some of the pros and cons of the apple ipad 2. If you are thinking for purchasing the new ipad it is essential that you read this ipad 2 review.

Well Apple have done it again with the ipad tablet. Featuring its fast speed, sleek design and light-weight feel, this next generation tablet device definitely is a chip off the old block. And if you’re looking to purchase an Ipad 2 soon, you’ll want to arm your self with as much knowledge on this device as you possibly can. In this ipad 2 review i will show you how the investment pays for itself well beyond the purchase price. You will find out how the apple ipad 2 has improved, what physical characteristics and functions were included, additionally a few positives and negatives about a new device.


How has Apple advanced on the initial apple ipad?

Apple designed the ipad tablet 2 significantly slimmer in comparison to the 1st version. It’s light-weight and even much better to handle. Despite the fact that I am not a user of some of the 1st model, I have noticed that one is a little bulkier and also more difficult to handle. It truly is amazing at how the apple company could get everything housed in such a tiny area. You will find an improvement in graphics also, using this version. Avid gamers really enjoy the ability to take a picture using the built in camera. The iPad 2 also utilizes a A5 duel processer system that is certainly really fast and with somewhere around 10 hours of battery life makes this a satisfying and practical addition to any electronic collection.

More Compact Size – Greater Functions?
The iPad 2 incorporates a pair of cameras. The front side camera is commonly employed for video communications with FaceTime. Chat face to face with a simple press of the button. If you know of someone in the world who have a Mac pc, iPad 2, or apple iphone 4 then it’s a genuinely excellent feature. On the backside, it offers a high definition video recorder and camera, however the camera doesn’t feature flash. There likewise is apparently a significant improvement within the acoustic area with the audio speakers providing improved sound quality.

A few Advantages and disadvantages of the iPad 2
The vast majority of what has been mentioned so far should be considered outstanding reasons why you are thinking about buying an Apple iPad 2. In case those factors aren’t sufficient, this system also allows you usage of Google books, iBook, Nook and Kindle offering hours of browsing enjoyment. But the apple ipad contains some of the cons which may or may not bother some owners. For starters, the iPad 2 lacks a dedicated SD card slot. This means that storage features tend to be limited and end users will need to carry around spare extensions. For getting around this, it is advised that users look at the 32 or 64 GB. Moreover, apple ipad doesn’t support flash media if you are the kind of person who is which is used to Flash applications to look at certain websites, this can be a determining consideration. Compared to Android’s line up of tablets that are less expensive and they can support flash. For those times you find yourself waiting in long lines of stores or waiting around three to four weeks from ordering online, once you discover what you deserve from of the apple company ipad then half your challenge is done.

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Chinese Firm Launches Cloud-Based Mobile OS

Sunday, July 31, 2011 in Tech News

China-based company Alibaba looks to take on the might of Apple and Google with a cloud-based operating system. According to the company, its Aliyun OS will be based on the Linux kernel, and will also be compatible with Android apps. Launched alongside the K-Touch Cloud-Smart Phone W700, Alibaba is hoping that a 0% slice of developer profits will encourage adoption and says it hopes manufacturers will take the platform to global markets.

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Facebook To Pay Hackers For Bugs

Sunday, July 31, 2011 in Tech News

Facebook is going to pay hackers to find problems with its website — just so long as they report them to Facebook's security team first. The company is following Google and Mozilla in launching a Web 'Bug Bounty' program. For security related bugs — cross site scripting flaws, for example — the company will pay a base rate of $500. If they're truly significant flaws Facebook will pay more, though company executives won't say how much. 'In the past we've focused on name recognition by putting their name up on our page, sending schwag out and using this an avenue for interviews and the recruiting process,' said Alex Rice, Facebook's product security lead. 'We're extending that now to start paying out monetary rewards.

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New Photonic Crystals Have Both Electronic and Optical Properties

Sunday, July 31, 2011 in Tech News

In an advance that could open new avenues for solar cells, lasers, metamaterials and more, researchers at the University of Illinois have demonstrated the first optoelectronically active 3-D photonic crystal.

Using an epitaxial approach, University of Illinois researchers developed a 3-D photonic crystal LED, the first such optoelectronic device. (Credit: Erik Nelson)








"We've discovered a way to change the three-dimensional structure of a well-established semiconductor material to enable new optical properties while maintaining its very attractive electrical properties," said Paul Braun, a professor of materials science and engineering and of chemistry who led the research effort.

The team published its advance in the journal Nature Materials.

Photonic crystals are materials that can control or manipulate light in unexpected ways thanks to their unique physical structures. Photonic crystals can induce unusual phenomena and affect photon behavior in ways that traditional optical materials and devices can't. They are popular materials of study for applications in lasers, solar energy, LEDs, metamaterials and more.

However, previous attempts at making 3-D photonic crystals have resulted in devices that are only optically active that is, they can direct light but not electronically active, so they can't turn electricity to light or vice versa.

The Illinois team's photonic crystal has both properties.

"With our approach to fabricating photonic crystals, there's a lot of potential to optimize electronic and optical properties simultaneously," said Erik Nelson, a former graduate student in Braun's lab who now is a postdoctoral researcher at Harvard University. "It gives you the opportunity to control light in ways that are very unique to control the way it's emitted and absorbed or how it propagates."

To create a 3-D photonic crystal that is both electronically and optically active, the researchers started with a template of tiny spheres packed together. Then, they deposit gallium arsenide (GaAs), a widely used semiconductor, through the template, filling in the gaps between the spheres.

The GaAs grows as a single crystal from the bottom up, a process called epitaxy. Epitaxy is common in industry to create flat, two-dimensional films of single-crystal semiconductors, but Braun's group developed a way to apply it to an intricate three-dimensional structure.

"The key discovery here was that we grew single-crystal semiconductor through this complex template," said Braun, who also is affiliated with the Beckman Institute for Advanced Science and Technology and with the Frederick Seitz Materials Research Laboratory at Illinois. "Gallium arsenide wants to grow as a film on the substrate from the bottom up, but it runs into the template and goes around it. It's almost as though the template is filling up with water. As long as you keep growing GaAs, it keeps filling the template from the bottom up until you reach the top surface."

The epitaxial approach eliminates many of the defects introduced by top-down fabrication methods, a popular pathway for creating 3-D photonic structures. Another advantage is the ease of creating layered heterostructures. For example, a quantum well layer could be introduced into the photonic crystal by partially filling the template with GaAs and then briefly switching the vapor stream to another material.

Once the template is full, the researchers remove the spheres, leaving a complex, porous 3-D structure of single-crystal semiconductor. Then they coat the entire structure with a very thin layer of a semiconductor with a wider bandgap to improve performance and prevent surface recombination.

To test their technique, the group built a 3-D photonic crystal LED the first such working device.

Now, Braun's group is working to optimize the structure for specific applications. The LED demonstrates that the concept produces functional devices, but by tweaking the structure or using other semiconductor materials, researchers can improve solar collection or target specific wavelengths for metamaterials applications or low-threshold lasers.

"From this point on, it's a matter of changing the device geometry to achieve whatever properties you want," Nelson said. It really opens up a whole new area of research into extremely efficient or novel energy devices.

source:- web

Disclaimer: Views expressed in this article do not necessarily reflect those of Techapex or its staff.

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Magnetic waves bake the sun's corona

Sunday, July 31, 2011 in Tech News

Why the sun's outer atmosphere is so blazing hot

SUN BURN
Loops and holes in the sun’s superhot atmosphere are easily seen in this combination of ultraviolet images. Recent measurements suggest that temperatures in these regions may spike in part because of magnetic waves.






Scientists are getting warmer in their hunt for a reason why the sun’s outer atmosphere is so hot. The key may be magnetic waves long sought but only recently spotted, an international team reports in the July 28 Nature.
Combined with observations reported earlier this year. high-speed gas jets shooting up into the sun’s outer atmosphere, or corona, the magnetic waves may explain why the thin halo of super hot gas blazes at temperatures as high as a couple million kelvins. The waves may also account for the force behind the solar wind particles that stream off the corona at hundreds of kilometers per second.
“These are results that have been awaited for 50 years,” says Peter Cargill of Imperial College London and the University of St. Andrews in Scotland, who wasn’t involved with the work.

Solar physicists have struggled all that time to understand how the corona can be so hot when the layer below it, the chromosphere, is more than a hundred times cooler. One longstanding theory is that waves traveling through the sun’s magnetic field transport energy up from the seething solar surface. These oscillations move along magnetic field lines like vibrations on a plucked guitar string. In 2007 a team including Scott McIntosh of the National Center for Atmospheric Research in Boulder, Colo., finally detected these waves in the chromosphere, but the hint the researchers saw of waves in the corona couldn’t explain the heat surge.

Now, using a sensitive instrument aboard NASA’s Solar Dynamics Observatory, McIntosh and his colleagues have discovered magnetic waves throughout the corona and the transition zone between it and the chromosphere.

“What surprises me is that they are seen absolutely everywhere and with energy levels that are able to do things to the corona,” Cargill says.

The waves wiggle at about the same rate as the ones in the chromosphere (they may even be the same waves, propagating upward). The energy supplied by the waves — the equivalent of one or two 100-watt bulbs per square meter of the sun’s surface — isn’t much, but is enough to power the solar wind and explain the energy pouring out of tranquil parts of the corona where things like flares aren’t happening. The waves can’t account for energy in active spots, but that might just be a byproduct of the way the spacecraft looks at the corona, Cargill and Ineke De Moortel of the University of St. Andrews suggest in a commentary published in the same Nature issue.

McIntosh’s team thinks there may be a two-step heating process happening. Solar magnetic activity may heat the jets, which then shoot upward, carrying their heat and the waves with them like the space shuttle’s solid rocket boosters shoot the whole thing into the sky, he says. In the corona the magnetic waves kick in, “like the main engine for the final push,” and deposit their energy in the gas. Exactly how the waves transfer energy to the corona isn’t clear.

source:- web

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Simplest Virus – The Fork Bomb

Thursday, July 28, 2011 in Tips n Tricks

A virus (as you know) is a piece of code that does something that it shouldn't. It is a common misconception that you need a vast skill set to make these and that they are extremely complex however in reality they are as simple as sin to make which is why they are so damn annoying.

A Fork bomb is considered to be the smallest writable virus in the batch language and it is capable of being annoying and if launched on a home computer however on a server will probably result in a crash.
A fork bomb creates two instances which each create two instances and so on..the processes recursively fork, this "forks" the processor and jamm it completely until a crash occurs.
Here is how to make it
open up notepad and type:
%0|%0
and save it as fork.bat Yep..its a virus of just 5 characters :P .
On double clicking this file,it will lead to total CPU jam by opening about 500+ process of command prompt .

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