uav

An unmanned aerial vehicle (UAV; also known as a remotely piloted vehicle or RPV, or Unmanned Aircraft System (UAS)) is an aircraft that flies without a human crew on board the aircraft. Their largest uses are in military applications. To distinguish UAVs from missiles, a UAV is defined as a reusable, uncrewed vehicle capable of controlled, sustained, level flight and powered by a jet or reciprocating engine. Therefore, cruise missiles are not considered UAVs, because, like many other guided missiles, the vehicle itself is a weapon that is not reused, even though it is also unmanned and in some cases remotely guided.

There are a wide variety of UAV shapes, sizes, configurations, and characteristics. Historically, UAVs were simple drones^[1] (remotely piloted aircraft), but autonomous control is increasingly being employed in UAVs. UAVs come in two varieties: some are controlled from a remote location, and others fly autonomously based on pre-programmed flight plans using more complex dynamic automation systems.

Currently, military UAVs perform reconnaissance as well as attack missions.^[2] While many successful drone attacks on militants have been reported, they are also prone to collateral damage and/or erroneous targeting, as with many other weapon types.^[1] UAVs are also used in a small but growing number of civil applications, such as firefighting or nonmilitary security work, such as surveillance of pipelines. UAVs are often preferred for missions that are too "dull, dirty, or dangerous" for manned aircraft.

iPad from Apple

The iPad from Apple Inc. (AAPL-Q235.970.970.41%) scored very well in terms of ease of use and battery life in its first reviews, but it won't obliterate the laptop computer market just yet, according to the New York Times and Wall Street Journal.







Reviewers at both papers said that while the tablet computer, which goes on sale on Saturday, works nicely for Web surfing or consuming media like video and books, it may appeal less to people who need laptops for more heavy duty chores.
The Journal's Walt Mossberg said he prefers the iPad as an e-reader to the popular Kindle e-reader from Amazon.com Inc. (AMZN-Q131.81-3.96-2.92%)


But David Pogue from the New York Times said the device's 1.5 pound weight is too heavy for reading compared to Kindle's 10 ounces. He also griped that “You can't read well in direct sunlight” and “You can't read books from the Apple bookstore on any other machine, not even a Mac or iPhone.”
Both reviewers said they were very impressed with the gadget's battery life as it lasted longer than Apple's impressive claim of 10 hours battery life.

4G MobileTechnology

4G refers to the fourth generation of cellular wireless standards. It is a successor to 3G and 2G standards. The nomenclature of the generations generally refers to a change in the fundamental nature of the service. The first was the move from analogue (1G) to digital (2G) transmission. This was followed by multi-media support, spread spectrum transmission and at least 200 kbit/s (3G) and now 4G, which refers to all IP packet switched networks, mobile ultra-broadband (gigabit speed) access and multi-carrier transmission.




A 4G system is expected to provide a comprehensive and secure all-IP based solution where facilities such as IP telephony, ultra-broadband Internet access, gaming services and streamed multimedia may be provided to users.






The remainder of this article uses 4G to refer to IMT Advanced (International Mobile Telecommunications Advanced), as defined by ITU-R.






An IMT Advanced cellular system must have target peak data rates of up to approximately 100 Mbit/s for high mobility such as mobile access and up to approximately 1 Gbit/s for low mobility such as nomadic/local wireless access, according to the ITU requirements. Scalable bandwidths up to at least 40 MHz should be provided. [1][2]






The pre-4G technology 3GPP Long Term Evolution (LTE) is often branded "4G", but the first LTE release does not fully comply with the IMT-Advanced requirements. LTE has a theoretical net bitrate capacity of up to 100 Mbit/s in the downlink and 50 Mbit/s in the uplink if a 20 MHz channel is used - and more if Multiple-input multiple-output (MIMO), i.e. antenna arrays, are used. Most major mobile carriers in the United States and several worldwide carriers have announced plans to convert their networks to LTE beginning in 2009. The world's first publicly available LTE-service was opened in the two Scandinavian capitals Stockholm and Oslo on the 14 December 2009, and branded 4G. The physical radio interface was at an early stage named High Speed OFDM Packet Access (HSOPA), now named Evolved UMTS Terrestrial Radio Access (E-UTRA).

Teleportation

                                                Teleportation
What is Teleportation ?
The conveyance of persons (esp. of oneself) or things by
psychic power; also in futuristic description, apparently
instantaneous transportation of persons, etc., across
space by advanced technological means.


Probably the best known example is the Star Trek ‘Transporter’.


When it comes to the real thing, teleportation means:

SCIENTISTS WORKING in Australia have "beamed up" a radio signal, in the manner of Captain Kirk.



Scientists at the Australian National University in Canberra say they have been able to teleport a laser beam


from one part of their lab to another. The scientists embedded a radio signal into a laser beam, then disintegrated the beam


and reassembled it a meter away virtually instantaneously. They say the laser beam was destroyed


in the teleportation process, but the radio signal survived.






The group of researchers led by physicist Ping Koy Lam have used quantum entanglement - a phenomenon


that links two light photons created at the same time - to induce the changes affected on one photon in another a meter away.






Ping Koy Lam disassembled laser light at one end of an optical communications system and recreated a replica


elsewhere in his lab. The laser beam didn't survive transportation, but its encoded message did.






Dr Lam told the BBC: "What we have demonstrated here is that we can take billions of photons,


destroy them simultaneously, and then recreate them in another place."






He reckons the system could be used to transport secure data. "It should be possible," he says


"to construct a perfect cryptography system. When two parties want to communicate with one another,


we can enable the secrecy of the communication to be absolutely perfect."






While transporting data may be possible, Lam reckons beaming humans to and fro is still some way off.









1) Measurement of the input "state", followed by


2) Disembodied transport of the state, and then


3) Perfect reconstruction in every detail.




It is not:
1) Instantaneous or faster than light


2) Easy

SOLID STATE DRIVE

A solid-state drive (SSD) is a data storage device that uses solid-state memory to store persistent data. An SSD emulates a hard disk drive interface, thus easily replacing it in most applications. An SSD using SRAM or DRAM (instead of flash memory) is often called a RAM-drive, not to be confused with a RAM disk. Recently, NAND based flash memory has become the standard for most SSD's.

The original usage of the term "solid-state" (from solid-state physics) refers to the use of semiconductor devices rather than electron tubes but, in the present context, has been adopted to distinguish solid-state electronics from electromechanical devices. With no moving parts, solid-state drives are less fragile than hard disks and are also silent (unless a cooling fan is used); as there are no mechanical delays, they usually enjoy low access time and latency.

Benefits Of CFL Lighting
25% of a typical home's electricity budget is spent on lighting inefficient incandescent light bulbs. A typical light bulb will cost 5 to 10 times its own cost in electricity during its relatively short lifetime. However there are alternatives. Compact Fluorescent Lights are miniature versions of full-sized strip flourescent lighting and screw straight into the light fitting.


Efficiency of CFL Bulbs
CFL bulbs are around four times as efficent as incandescent light bulbs and last up to 10 times longer. Therefore a 22 Watt CFL will offer the same amount of light as a 100 Watt incandescent bulb and will last for around five years. Using an 18 Watt CFL in place of a 75 Watt standard light bulb will save over 500 kWh over its lifetime offering savings of around £25 - far in excess of the initial cost of the CFL - and will prevent half a ton of CO2 being pumped into the atmosphere by power stations.


Where can CFL Bulbs be Used
CFLs can be used in almost all locations where incandescent light bulbs are used. However the lifetime of a CFL is reduced greatly when used in applications where the light is frequently switched on and off. Also sometimes they are unsuitable for use with dimmer switches, and they cannot be used as spot lights - they are better for lighting whole rooms.


Disadvantages of CFL Bulbs
CFLs do have their disadvantages - for example the average CFL bulb contains 4mg of toxic Mercury.

                                                                LED TV


LED-backlit LCD television (called LED TV by Samsung Electronics, Panasonic,Toshiba, Philips, LG Electronics, ProScan and Vizio and not to be confused with true LED displays) is an LCD TV that uses LED backlighting[1] rather than fluorescent lights used in traditional LCD televisions.

The LEDs can come in two forms, Dynamic RGB LEDs which are positioned behind the panel, or white Edge-LEDs positioned around the rim of the screen which use a special diffusion panel to spread the light evenly behind the screen.[2]

LED Backlighting Techniques
[edit]
RGB Dynamic LEDs

This method of backlighting allows dimming to occur locally creating specific areas of darkness on the screen. This can show truer blacks, whites and PRs at much higher dynamic contrast ratios, at the cost of less detail in small bright objects on a dark background, such as star fields.[3]
[edit]
Edge-LEDs

This method of backlighting allows for LED-backlit TVs to become extremely thin. The light is diffused across the screen by a special panel which produces a uniform color range across the screen.

Sharp also has LED backlighting technology that aligns the LEDs on back of the TV like the RGB Dynamic LED backlight, but it lacks the local dimming of other sets.[4]
[edit]
Differences between LED-backlit and CCFL-backlit LCD displays

LED-backlit LCD TVs differ from conventional CCFL-backlit LCD TVs in the following:
They can produce an image with greater dynamic contrast compared with CCFL-backlit LCD TVs.[5]
With Edge-LED lighting they can be extremely slim. Current models on the market can be less than one inch thick.[5]
They can offer a wider color gamut, especially when RGB-LED backlighting is used.[5]
Lesser environmental pollution on disposal.[5]
Higher cost due to current market product placement.[5]
[edit]
Technology

TV manufacturers can use an LED backlight instead of the standard Cold Cathode Fluorescent Lamps (LCD-CCFL) used in most LCD televisions. It is important to distinguish this method of simply backlighting a conventional LCD panel, from a hypothetical true LED display, or an OLED display. LCD-based televisions described as 'LED TVs' are vastly different from self-illuminating OLED, OEL or AMOLED display technologies. In terms of the use of the term 'LED TV' in the UK, the ASA (Advertising Standards Authority) has made it clear in prior correspondence that it does not object to the use of the term, but does require it to be clarified in any advertising. There are several methods of backlighting an LCD panel using LEDs including the use of either White or RGB (Red, Green and Blue) LED arrays positioned behind the panel; and Edge-LED lighting, which uses white LEDs arranged around the inside frame of the TV along with a special light diffusion panel designed to spread the light evenly behind the LCD panel.

An LED backlight offers several general benefits over regular CCFL backlight TVs, typically higher brightness. Compared to regular CCFL backlighting, there may also be benefits to color gamut. However advancements in CCFL technology mean wide color gamuts and lower power consumption are also possible. The principal barrier to wide use of LED backlighting on LCD televisions is cost.

The variations of LED backlighting do offer different benefits. The first commercial LED backlit LCD TV was the Sony Qualia 005 (introduced in 2004). This featured RGB LED arrays to offer a color gamut around twice that of a conventional CCFL LCD television (the combined light output from red, green and blue LEDs produces a more pure white light than is possible with a single white light LED). RGB LED technology continues to be used on selected Sony BRAVIA LCD models, with the addition of 'local dimming' which enables excellent on-screen contrast through selectively turning off the LEDs behind dark parts of a picture frame.

Edge LED lighting was also first introduced by Sony (September 2008) on the 40 inch BRAVIA KLV-40ZX1M (referred to as the ZX1 in Europe). The principal benefit of Edge-LED lighting for LCD televisions is the ability to build thinner housings (the BRAVIA KLV-40ZX1M is as thin as 9.9mm). Samsung has also introduced a range of Edge-LED lit LCD televisions with extremely thin housings.

LED-backlit LCD TVs are considered a more sustainable choice, with a longer life and better energy efficiency than plasmas and conventional LCD TVs.[6] Unlike CCFL backlights, LEDs also use no mercury in their manufacture. However, other elements such as gallium and arsenic are used in the manufacture of the LED emitters themselves, meaning there is some debate over whether they are a significantly better long term solution to the problem of TV disposal.

Because LEDs are able to be switched on and off more quickly than CCFL displays and can offer a higher light output, it is theoretically possible to offer very high contrast ratios. They can produce deep blacks (LEDs off) and a high brightness (LEDs on), however care should be taken with measurements made from pure black and pure white outputs, as technologies like Edge-LED lighting do not allow these outputs to be reproduced simultaneously on-screen.

In September 2009 Nanoco Group announced that it has signed a joint development agreement with a major Japanese electronics company under which it will design and develop quantum dots for LED Backlights in LCD televisions.[7] Quantum dots are valued for displays, because they emit light in very specific gaussian distributions. This can result in a display that more accurately renders the colors that the human eye can perceive. Quantum dots also require very little power since they are not color filtered.