Google nexus 7 new contestant for IPhone

Inside the Google Nexus 7 is a quad-core Tegra 3 processor packing a 12-core GPU and 1GB of on-board RAM. This, combined with some clever under-the-hood streamlining, means a buttery-smooth performance (pun intended, see below).Its operating system is Android Jelly Bean

Google's tablet runs Google's latest operating system:Android 4.1, aka Jelly Bean. It also benefits from the very polished "Project Butter" user interface technology, which is much smoother than previous Androids or Amazon's forked version of the OS, and it's the first Android tablet to ship with Chrome as its default browser.

There's also a big camera improvement, a whole host of browser tweaks and some clever voice recognition upgrades... in short, a lot of worthwhile reasons to check out the first Android Jelly Bean device.

The Nexus 7 is 198.5 x 120 x 10.45mm. It's considerably lighter than an iPad, and lighter even than a Kindle Fire: at just 340g, the Nexus 7 is the weight of a fairly slim book.

The Nexus 7 display is a seven-inch, 1280x800 IPS display, and you can choose between 8GB and 16GB versions.

There's integrated Wi-Fi but no 3G or 4G, a front-facing camera and a 4,325mAh battery that Google says is good for 8 hours of "active use".

There's also no microSD card slot, so you're limited massively if you're one of those that loves HD movies.

The Nexus 7 tablet includes a microphone, Bluetooth, NFC for Android Beam, an accelerometer, magnetometer, GPS and gyroscope, and the built-in Wi-Fi supports 802.11b, g and n.

Smart Dust,the Future Giant .......................

Smart Dust in a Fingure

• It is mainly Micro-Electro Mechanical System.   It combines  sensing, robotics, computing  that can sense light, temperature ,vibration,magnetism or chemicals.

         They are usually networked wirelessly and are distributed over some area to perform tasks, usually sensing.Smart dust was invented in 2001 by Kristopher S. J. Pister, who is an electrical engineering and computer science professor for the University of California

Smart Dust Component

CCR

It comprises three mutually perpendicular mirrors of gold-coated polysilicon

The CCR has the property that any incident ray of light is reflected back to the source

Using a micro-fabricated CCR, we can achieve data transmission at a bit rate up to 1 kilobit per second, and over a range up to 150 meters, using a 5milliwatt illuminating laser

Operation On Mote (Single unit of smart dust)

Periodically the microcontroller gets a reading from one of the sensors, which measure one of a number of physical or chemical stimuli such as temperature, ambient light, vibration, acceleration, or air pressure, processes the data, and stores it in memory.

It also occasionally turns on the optical receiver to see if anyone is trying to communicate with it

This communication may include new programs or messages from other motes

Microcontroller  will use the corner cube retro reflector or laser to transmit sensor data or a message to a base station or another mote.

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