Apple iOS 5 is, arguably, the version we’ve always been waiting for. New iOS builds have always introduced new features, but in iOS 5 Apple sets out its digital hub ecosystem, the culmination of a decade of product positioning and service development. It also brings very specific challenges to each of Apple’s key competitors – Siri as the answer to Android’s voice command system.
Sunday, October 23, 2011
DDR3, which stands for Double Data Rate 3 (first release in 2007) , is a high-speed random access memory technology that is used in more than just computers. Smart phones, PDAs, Netbooks and other small electronic devices often take advantage of DDR3 memory,It offers many advantages over its predecessor, DDR2. DDR3 offers high-speed RAM that will help keep your computer running quickly & smoothly.
Speed & Performance
Thursday, October 20, 2011
is the most commonly used name now a days, as it is now the most unavoidable part of mobile phones. The name Bluetooth came from a Swedish word. Bluetooth logo is bind rune merging with German rune.
AS said earlier it uses radio technology. Bluetooth chops the data before getting sent it and converts to normal data after got reached in the appropriate destination in a definite frequency. It can exchange data between the devices like , mobile phones, telephones, laptops, personal computers, printers, global positioning system receivers etc.
It is the well known protocol used for transferring data in between shortest distances from fixed and mobile services. It uses radio waves for the transmission creating PERSONAL AREA NETWORKS (PAN). Actually it was conceived as a wireless alternative to RS232 port. The most notable feature of Bluetooth is, it is able to connect several different devices to it overcoming the problems of synchronization.
are made by Bluetooth Special Interest Group (BSIG). Actually Bluetooth firstly designed for low power consumption and low distance data transfer. Suddenly I made a new boom in the market since it is very cheaper and handy. But later the distance in between the data transfer got varied. Mostly they are divided into three different classes depends on its range. Class 1 can exchange data within a range less than 100m, Class 2’s range is less than 22m and class 3 ranges upto 6m. Bluetooth has two versions also. It is version 1.2 and version 2.0 + EDR.
Bluetooth finds in the fields of Wireless control and communication, between PC’s, transfer of files, contact details, for controlling the vast use of infrared, to provide wireless bridge between Ethernet networks etc.
Bluetooth was developed in 1994 by Jaap Haartsen and Sven Mattisson who were the workers of SONY ERICCSON Mobile platforms. Bluetooth had come across various changes and new updations. Bluetooth versions like Bluetooth 1, Bluetooth 1.1, Bluetooth 1.2, Bluetooth 2.0, Bluetooth 2.1, and Bluetooth 3.0 are the best examples for this change. Each of these is updated in quality and process depending on the needs of people.
The OLED has an emissive electroluminescent layer. This electroluminescent layer consists of a film of organic compounds. This organic compound film emits light if we provide an electric current to it. The layer of organic semiconductor is placed between two electrodes and typically one of these electrodes is made transparent.
The OLEDs find a wide range of applications. They are being used in and television set screens. The portable system screens like mobile phones and PDAs also make use of this technology. The organic LEDs are also used in , information and indication fields. The property of l space illumination I light sources also utilizes the OLEDs.
The light emitting elements are of various ranges. And the large area hitting light emitting elements uses an organic led. As these organic LEDs are in their early stages of development they emit comparatively less light area than the inorganic LED point light sources which are solid state based.
There is no backlight for an OLED. The displaying of functions is done in the absence of backlight. This makes OLED capable of displaying black levels. Also it becomes thinner and lighter than the liquid crystal displaying. On comparing to LCD, the OLEDs show a better in dark rooms. They are able to acquire a higher contrast ratio in such conditions if the LCD uses a cold cathode fluorescent lamp or a LED backlight that is developed very recently.
Substrate (clear plastic, glass, foil) - The substrate supports the OLED.
Anode (transparent) - The anode removes electrons (adds electron "holes") when a current flows through the device.
Organic layers - These layers are made of organic molecules or polymers.
Conducting layer - This layer is made of organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.
Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting layer) that transport electrons from the cathode; this is where light is made. One polymer used in the emissive layer is polyfluorene.
Cathode (may or may not be transparent depending on the type of OLED) - The cathode injects electrons when a current flows through the device.
Wireless energy transfer also known as wireless power is a method of electrical energy transmission from a source to load without the use of to connect it. This is an emerging transmission method expected to be realized sooner. It may provide a solution for many of the problems caused in the field of electricity transmission. This type of transmission is most effective when the use of connecting wires is hazardous or in convenient. As in any other transmission systems, the wireless energy transfer has also limitations. But the problem of this field is quite different from that of normal telecommunications such as radio. In the case of radio, if the proportion of energy received is too low to be distinguished from the background noise, then it becomes critical. And for wireless power, the efficiency parameter is the more significant one. If the system is to be efficient and economical, then the main or large portion of the generated power should reach the receivers.
The most common method to wireless energy transfer is by using direct induction succeded by resonant magnetic induction. The new innovative methods available are electromagnetic radiation as microwaves or lasers.
The flow of electrical energy involves the phenomena inside the conductor and those outside the conductor, that is, in the electric field. In the conventional electric power transmission and distribution, it is the phenomena inside the conductor that is of prime importance. Here the electric field outside the conductor is just checked occasionally. But if we use electric power for radio transmission or wireless energy transmission, it is the electric and magnetic fields outside the conductor which is called the electromagnetic radiation that is important in the message transmission. And we do not use the phenomenon in the conductor. A magnetic field and electric lines of force resulting from it are produced by the electric charge displacement in the conductor. In the direction to the conductor, the magnetic field will be maximum which the property of a ferromagnetic body to align itself in right angles to the conductor.
But the electric field is maximum in a direction radial to the conductor and will cause the dielectric bodies to be attracted or repelled radially to the conductor.
The wireless transmission through electro dynamic induction is near field up to one- sixth of the used wave length used. Even though it is non radiative, some radiative losses occur. An electrical transformer is the simplest example of wireless transmission.
Wednesday, October 19, 2011
When talking about , the first question that comes in our mind is 4G stands for Fourth Generation Technology and is successor of . In 2009, the organization specified the (International Mobile Telecommunications Advanced) requirements for 4G standards, setting peak speed requirements for 4G service at 100 (Mega bit per Second) for high mobility communication (such as from trains and cars) and 1 (Gega bit per Second) for low mobility communication (such as pedestrians and stationary users)!
Monitors are made of invariably 2 layers - a front layer of LCD (Liquid Crystal Display or Liquid Crystal Diode) that makes up the dots you see as pixels, along with the display of color.
This LCD layer is then back-lighted using light tubes at the back, giving it brightness. Formerly, LCD displays use to use CCFL (Cold Cathode Flourescent Lamp) as a light source at the back, but however in recent years there has been a marked shift towards the use of LED (Light Emitting Diode) as a back-light source.
The advantages of LEDs are as follows:
1. : LEDs can reach maximum brightness faster than CCFLs, in fact almost instantly.
2. : CCFLs are known to give a warm/yellowish tint. LEDs have a more neutral whitepoint.
3. : LEDs are brighter generally than CCFLs, thus allowing a display to achieve even higher maximum brightness.
4. : The reason LEDs are coming into prominence is that it was driven by the notebook sectors - LED back-lighting can be made thinner than CCFL back-lighting.
5. : Apparently, LEDs are rated for more life than CCFLs. Also the degradation over time is less severe than CCFLs.