It's difficult to remember a time before tablets, but it's been four short years since the original Apple iPad hit the scene, and the current tablet market was born. Since then, we've seen scores of manufacturers trying to snag a slice of the tablet pie. And the game is finally getting interesting: For the first time in 2013, Android tablet sales overtook the iPad. Growth is so rapid in the segment that some analysts claim tablets will make up half the PC market in 2014. There's no denying the tablet is here to stay.

But which tablet is right for you? Whether you're eyeing an iPad, one of the manyAndroid tablets available, or a Windows model, here are the key factors you need to consider when shopping for a tablet:

What do You Want to Do With Your Tablet? 

Despite four years of refinements, tablets still can't truly replace computers or smartphones. You can tackle productivity tasks on a tablet, but there are inherent ergonomic benefits to desktops and laptops. Plus, since we're talking about slates here, we're mostly talking about on-screen keyboards. There are plenty of worthy add-on hardware keyboards, especially for the iPad, but few will provide the same comfort you'll experience with a laptop or a desktop. The main focus of the tablets we'll discuss here is media consumption, rather than productivity. We'll touch on lower-cost Windows tablets here as well, but if you want a convertible tablet with a laptop-grade processor for serious work, take a look at the top-rated Windows 8 tablets we've tested—but be prepared to pay laptop prices, as many run around the $1k mark. 

Choose Your Operating System

Just like with a full-fledged computer, if you're getting a tablet, you need to pick a camp. And just like with a computer, your decision will likely come down to your gut feeling. Right now, the top contenders are Apple with its iPads and Android with its many hardware choices from the likes of Acer, Amazon, Asus, Google, Samsung, and others. And we're finally seeing affordable Windows 8 tablets built around Intel's Atom (formerly codenamed Bay Trail) processor from various manufacturers like Asus, with its excellent, under-$500 Transformer Book T100TA. Meanwhile, Windows RT, a slimmed-down version of Windows 8, continues to chug along, but doesn't support all Win 8 apps. Microsoft released the second version of its RT-based Surface tablet$449.99 at Amazon this year, but the company seems to be hinting that it might roll RT into its Windows Phone OS in the future. If you want a Windows tablet, Win 8 is the way to go.

Generally speaking, the greatest strength of Apple's iOS, the operating system on the iPad and iPad mini£261.00 at Amazon, is twofold: It's very clean and intuitive, and the wide selection of iPad apps that you can buy right on your tablet—more than 500,000 iPad-specific titles at the time of this writing—work uniformly well with very few exceptions. (For more, check out our full iOS 7 Review.)

Google's Android mobile OS is a more complicated story. Besides having your choice of hardware from several manufacturers, at any given time, there are a few iterations of Android floating around on various devices. The latest version, 4.4KitKat, is the best yet, with maximum configurability, a top-notch notification system, fast and smooth Web browsing, and seamless integration with Google applications like Gmail, Google Maps, and Hangouts for video chat. Android also includes support for multiple user logins so you can share your tablet with a friend or family member, a useful feature that's missing in Apple tablets. Right now, though, you can only find KitKat on a few models including Google's own Nexus-branded tablets, some Samsung Galaxy Tabs, and the LG G Pad 8.3 Google Play Edition.

Windows 8 comes the closest to offering a traditional computing experience with full x86 support for all of your Windows software. And you can run the full version of Microsoft Office when you buy a Win 8 tablet. Connectivity options and hardware add-ons for Windows models are also typically more plentiful than with other tablet types.

What About Apps?

What's a tablet without quality apps? If you want every third-party app under the sun, right now, nothing out there beats the iPad with its half-a-million programs and games designed specifically for Apple tablets. The App Store is well-curated and monitored, offers a deep selection, and includes every popular app you can think of. If a wide range of compelling apps that look good and work well your tablet is your main priority, Apple is your best bet.

Android has made some strides on app selection, courting more developers and offering more high-quality tablet apps, but its still nowhere near the number Apple offers. It's tough to say exactly how many tablet-optimized Android apps are available, but it's likely in the thousands, rather than the hundreds of thousands. There are also Android phone apps, which look decent on a 7-inch tablet, but less so on a 9- or 10-inch one, so you're likely to have more problems getting high-quality apps for larger Android tablets.

Windows 8, meanwhile, offers an impressive array of more than 100,000 touch-screen-friendly tablet apps, but remember, you can also run all of your standard Windows-compatible programs.

Screen Size and Storage

This consideration is a bit obvious, but size—both screen real estate and storage capacity—is important to consider. First things first: When you hear the term "10-inch or 7-inch tablet" this refers to the size of the screen, measured diagonally, and not the size of the tablet itself. 7-inch tablets are considered small-screen, while 8.9- to 10-inch tablets are considered large screen. Apple iPads, Google Nexus, and Amazon Kindle Fire tablets all come in both small- and large-screen iterations

Lately, some phones are even blurring the lines with tablets. For example, Samsung, for one, wants you to have multiple choices, so it offers its Galaxy line in five different screen sizes ranging from 5.7 to 12.2 inches. The smallest, the Galaxy Note 3$616.80 at T-Mobile, is actually a phone with plenty of tablet-like features, including a stylus, that mirror what the larger versions offer. And the Galaxy Mega$0.00 at Amazon, is also more phone than tablet in that it requires a two-year contract, but it packs a huge 6.3-inch display.

Screen resolution is important too, especially for ebook reading and Web surfing. A sharp, bright display is key. Right now, the sharpest you'll find is 2,560 by 1,600 pixels on the Amazon Kindle Fire HDX 8.9"$339.00 at Amazon (339 pixels per inch) and the 2014 Samsung Galaxy Note 10.1 (298 ppi). The iPad Air$499.00 at Apple Store with its 2,048-by-1,536-pixel (264 ppi) Retina display is no slouch either. If you're in the market for a 10-inch Android tablet, look for a display with at least a 1,280-by-800 resolution. For 7-inch models: The entry-level Amazon Kindle Fire HD's display is 1,280 by 800, and is perfectly viewable, even for ebook reading, but line it up side-by-side with the same-size Amazon Kindle Fire HDX's 1,920-by-1,200 screen, and you'll notice the difference.

The weight of a tablet is one definite advantage it has over a laptop—but with large-screen tablets typically weighing around a pound, they're not cell-phone light. After you hold one with a single hand on a subway ride for 20 minutes, your hand will get tired. Setting one flat in your lap, rather than propped up on a stand, can also be a little awkward. And few tablets will fit in your pocket, unless it's an extra large jacket pocket.

Cloud (off-device) storage is an option for many tablets (iCloud for iPads, Amazon Cloud Storage for Kindle Fires, and OneDrive for Windows), but when it comes to on-board storage, more is always better. All those apps, when combined with a typical music, video, and photo library, can take up a lot of space. Right now storage tops out at 128GB of flash-based memory, and that's only on the iPad Air and the iPad mini, with most of the tablets we've tested available in either 16, 32, or 64GB varieties. Larger-capacity models can get as expensive as full-featured laptops, though—the 128GB Wi-Fi-only iPad rings up at $799; add 4G service, and you're up to almost $930. Some non-Apple tablets have microSD memory card slots that let you expand storage.

Wi-Fi-Only vs. Cellular Models

Many tablets come in a Wi-Fi-only model or with the option of always-on cellular service from a wireless provider. If you want to use your tablet to get online anywhere, you should opt for a model that offers a cellular version, like the aforementioned iPads, or the Wi-Fi + 4G version of the Amazon Kindle Fire HDX$199.00 at Amazon. Of course, this adds to the device's price, and then you need to pay for cellular service. Generally, though, with a tablet, you can purchase data on a month-to-month basis, without signing a contract.

Another way to get your tablet online: Use your phone as a Wi-Fi hotspot for your tablet. This won't work with every phone/tablet combo, so you should check with your carrier before you seal a deal.

Finally, before you buy, if you can, head to your local electronics store to get hands-on time with some different tablets, so you can see which feels and works best for you.

Post from : pcmag.com

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Every time you recharge your lithium-ion batteries, their storage capacity decreases just a little bit. That is why your mobile gadgets won't stay on nearly as long as they did even a year ago. But thanks to research by the US Department of Energy, we finally know why exactly that occurs and, more importantly, how to stop it from happening.

As Lithium-ion batteries discharge, the lithium ions (Li+) carry an electrical charge from the anode to the cathode across a non-aqueous electrolyte. This is what powers your phone. It is not a perfectly repeatable system though, and each time the lithium ions move through the battery, they cause minute changes to the electrodes' physical structures. This is what eventually kills your battery's capacity.

Two recent studies published by the journal, Nature Communications, by teams at national DoE labs—including Lawrence Berkeley, Brookhaven, SLAC and the National Renewable Energy Laboratory—have peered intensely into this process and have made some surprising discoveries.

"We discovered surprising and never-before-seen evolution and degradation patterns in two key battery materials," Huolin Xin, a materials scientist at Brookhaven Lab's Center for Functional Nanomaterials (CFN) and co-author on both studies, said in a press release. "Contrary to large-scale observation, the lithium-ion reactions actually erode the materials non-uniformly, seizing upon intrinsic vulnerabilities in atomic structure in the same way that rust creeps unevenly across steel." As Li+ ions move across the nickel-oxide anode when discharging, it causes minute breaks in the material, diminishing its capacity.

"Consider the way snowflakes only form around tiny particles or bits of dirt in the air," Xin explains. "Without an irregularity to glom onto, the crystals cannot take shape. Our nickel oxide anode only transforms into metallic nickel through nanoscale inhomogeneities or defects in the surface structure, a bit like chinks in the anode's armor."

On the other hand, as lithium ions move across the cathode when charging they generate a kind of rock-salt that forms an electrically-insulating crust, also reducing its capacity.

"As the lithium ions race through the reaction layers, they cause clumping crystallization—a kind of rock-salt matrix builds up over time and begins limiting performance," Xin said. "We found that these structures tended to form along the lithium-ion reaction channels, which we directly visualized under the TEM [transmission electron microscope - ed]. The effect was even more pronounced at higher voltages, explaining the more rapid deterioration."

So now that we know how these batteries are slowly breaking down over the course of their operational lives, researchers should be able to leverage the data into new and more robust battery designs.

"It may be possible to use atomic deposition to coat the NMC cathodes with elements that resist crystallization, creating nanoscale boundaries within the micron-sized powders needed at the cutting-edge of industry," Xin said. "In fact, Berkeley Lab battery experts Marca Doeff and Feng Lin are working on that now."

Obviously it's going to be a few years before this technological breakthrough trickles down to the consumer market but, when it does, we'll be one step closer to cutting ties with our power cords for good. [Brookhaven via R&D Mag]

Post from : gizmodo

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Although iOS8 also about to launch, but there are some tips you may iOS7 not know! There are some you can continue to use the iOS8, and live it well is important! Look you still do not know which one is right!








1) Return to the previous screen slide right

In fact, it began to have a function in iOS7, and among native applications are fully supports this feature, but in most promising iOS7 optimized applications can use this one gesture.

Actual use:
When you see a thing when I wanted to return to the previous page, you may be struggling to stick your fingers into the top left of the screen to press the return key, in fact, you only need the far left of the screen to the right in a slide which can be completed an action is necessary.

2). IMessage displays detailed transceiver time 

iMessage in one of the most annoying feature is no transceiver time, often only a rough time to start a conversation, all of a sudden have the time it is hard to forget the time he is not ruling late reply or something. In fact, the same iOS7 have started this feature, but a marker iOS these collections have been very good, even not everyone knows. 

Actual use: 

In iMessage, find your time watching to see which messages to send and receive accurate, according to a sliding screen to the left, continue pressing the hold, you can see the time stamp.

3) Shake in the mail about your device now! 

Shake to undo what has been is not a new technique, and has been through since you can shake the device to return to the previous step, for example, when entering text can also shake the device to remove what had just entered text. But in iOS7 this function was taken into "Mail" app being. You are not careful when accidentally deleted e-mail through this can also be a way to recover ah! 

Actual use: 

You delete a message, or e-mail filtering some time. You can pick up the device, so shake it, the screen will appear a window asking if you want to redo the above action.

4 ) speed back to your draft message 

Sometimes when you write an email, do not leave what inevitably open Whatsapp or Safari to confirm the information, or even open another email. Then copy the data to e-mail within this time you will save a draft, then how can come back again into their own drafts and do not re-start it. 

Actual use: 

When you save a draft of the time, back into the mail app again, the bottom right there is a "new mail" symbol (a pen on the square). You just need to hold it down, it will automatically enter into the draft bar, so you choose to continue to prepare drafts!

5. Accelerate the speed you enter the URL 

When you enter the URL of the ten million characters when, iOS also hope to help you out, if only. Com or. Net for a few characters. In fact, many times, but also some common URL suffix without their own input. 

Actual use: 

Enter the URL when long press "." Symbol will appear several popular choice, the regional language, and so will have to make these choices, respectively, but the ". Com" ". Net" Some of these are also some !

6.iPad special! Long press "," call out "'" 

Enter text in iOS is not difficult, but sometimes it will be because you want to enter different "rare symbol" and the overall work slowdowns or make you feel irritable and so on. In fact, the iPad to enter "'" (ie I'm a boy. In that one symbol) do not need to find everywhere. 

Actual use: 

Among the traditional QWERTY keyboard, just in the lower right "," long press and hold, that there will be "'" to choose from! So that you can enter more symbols in the case does not convert the keyboard!

7 ) native calendar is actually very easy to move to amend the itinerary one second that is OK! 

Most sometimes make you choose to use other calendars reason is because the interface is hard to use and editing features little more. In fact, the native calendar is also convenient for several magical techniques you might slovenly not know, do not know if it will make you change your mind again using the native calendar should do it? 

Actual use: 

When you press a good time to build an itinerary, when in fact the start time and the time required to do so slowly setting, users only need to press the items, you can drag yourself start time, more items on the bottom there is a small dot, users can also be required to lengthen or shorten the time required activities.

8)  IPad exclusive! Four fingers and five fingers gesture speed back to the main screen! 

Double-click the Home button if you feel you can not reach the speed of mind, then this little tricks you must know it! Four-finger gestures were two, then refers to a 5. 

Actual use: 

Four fingers (a): When you slide up to four fingers anywhere on the screen, you can summon a list of multi-tasking, double-click the Home button instead of the action, but you can extend the life of the Home key! In contrast, four fingers on the screen to turn off the decline is multi-tasking. 

Four fingers (two): When you're in an app to a sliding four fingers left on the screen, you can just switch to a recently used app. Thereafter, you can also left again, or right to slide, stop switch in the most recently used app. 

Fingers: a app among your fingers to the middle of the screen can be a catch (swipe), you can click the Home button instead of the function, back on the main screen!

9)  Close an app, no need to press the "x" button. 

Before iOS7, want to manually close an app, press the multi-tasking needs in one app, and then press the "x" to close the action, after iOS7 updates, re-create the multi-tasking interface, some users do not even know how to manually close an app. While Apple has said there is no need for this one, but sometimes when problems arise app, this technique is also necessary to understand. 

Actual use: 

After you press the Home button twice to call out the multi-tasking bar, to find out plan to manually close the app, press and hold in his preview, and to close the app on a slide, you can manually.

10 Control "Control Center" can be used when 

Control Center is undoubtedly a good design, but also a certain degree repugnant design, you happily Cesi melon, fled the temple when accidentally pulled the control center, but a people have wanted to smash phone feeling! In fact, iOS also promising you thought this is a problem, so you can avoid problems. Of course, if you do not regularly encounter this phenomenon, then, is it in any place can also call out would be more convenient for it! 

Actual use: 

In the settings, locate the control center, which has two different options allows you to switch. If you regularly while playing the game, unfortunately opened the Control Center, then close the second option will let one way you can continue to swim!

The News From : TechBang

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