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near field communication full report


Posted by: computer science technology
Created at: Saturday 30th of January 2010 05:25:44 AM
Last Edited Or Replied at :Wednesday 29th of June 2011 11:50:01 PM
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nt modules. Driver software is needed in the mobile device to drive the NFC PN531 on the NFC-Bluetooth Bridge to react to NFC targets that are tapped between each other, and to send and receive information from it.

SECURITY ASPECTS
First of all it should be mentioned that the short communication range of a few centimeters, though it requires conscious user interaction, does not really ensure secure communication. To analyze the security aspects of NFC two very interesting papers have been published. In Ernst Haselsteiner and Klemens Breitfuß discuss some threats a..................[:=> Show Contents <=:]



Near Field Communication NFC


Posted by: computer science crazy
Created at: Monday 23rd of February 2009 02:04:23 PM
Last Edited Or Replied at :Tuesday 14th of February 2012 02:45:45 AM
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Fi, can be used for longer range communication or for transfering larger amounts of data. Its development was parallel to RFID (Radio Frequency Identification), but both differ in many ways. NFC offers a very short range as compared to RFID. This is an added advantage in the sense that it requires very little transmission power and cheap transmitters can be used for the purpose. Hence it is very suitable for Smartcard like applications. It can also work in both active and passive modes. NFC works on a frequency range of 13.56 MHz. It offers a baud rate of 106 kbps to 424kbps. The transmission ..................[:=> Show Contents <=:]



Spin Valve Transistor


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:52:29 AM
Last Edited Or Replied at :Thursday 17th of January 2013 12:24:31 AM
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988. GMR is 200 times stronger than ordinary Magneto Resistance. It results from subtle electron - spin effects in ultra multilayers of magnetic materials that cause a huge change in electrical resistance.

The discovery of Spin Valve Transistor (GMR in magnetic multilayers) has let to a large number of studies on GMR systems. Usually resistance of multilayer is measured with the Current in Plane (CIP). For instance, Read back magnetic heads uses this property. But this suffers from several drawbacks such as; shunting and channeling, particularly for uncoupled multilayers and for thick space..................[:=> Show Contents <=:]



Electronic Data Interchange EDI


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:31:11 AM
Last Edited Or Replied at :Monday 28th of February 2011 11:47:41 PM
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computer exchange of business information using a public standard. EDI is a central part of Electronic Commerce (EC), because it enables businesses to exchange business information electronically much faster, cheaper and more accurately than is possible using paper-based systems.

Electronic Data Interchange, consists of data that has been put into a standard format and is electronically transferred between trading partners.Often ,an acknowledgement is returned to the sender informing them that the data was received. The term EDI is often used synonymously with the term EDT. These two terms ..................[:=> Show Contents <=:]



BiCMOS Technology


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:18:30 PM
Last Edited Or Replied at :Tuesday 22nd of March 2011 06:17:23 AM
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ration of RF and analog mixed-signal circuits into high-performance digital signal-processing (DSP) systems must be done with minimum cost overhead to be commercially viable.

While some analog and RF designs have been attempted in mainstream digital-only complimentary metal-oxide semiconductor (CMOS) technologies, almost all designs that require stringent RF performance use bipolar or semiconductor technology.

Silicon integrated circuit (IC) products that, at present, require modern bipolar or BiCMOS silicon technology in wired application space include the essential optical network (S..................[:=> Show Contents <=:]



Microprocessor Based Alternator Synchronisation


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:09:02 PM
Last Edited Or Replied at :Saturday 25th of February 2012 01:24:00 AM
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method calls for of the operator and accuracy is less and it depends on the sense of correct judgment of the operator.

Moreover the microprocessor based alternator synchronizer is user friendly and requires less maintenance. It also exploits the ..................[:=> Show Contents <=:]



Stealth Fighter


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:55:04 PM
Last Edited Or Replied at :Monday 04th of October 2010 02:40:48 AM
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radar by its altitude and speed.

HOW DOES STEALTH TECHNOLOGY WORK?
The idea is for the radar antenna to send out a burst of radio energy, which is then reflected back by any object it happens to encounter. The radar antenna measures the time it takes for the reflection to arrive, and with that information can tell how far away the object is. The metal body of an airplane is very good at reflecting radar signals, and this makes it easy to find and track airplanes with radar equipment.
The goal of stealth technology is to make an airplane invisible to radar. There are two different ways to..................[:=> Show Contents <=:]



mass airflow sensor


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:05:08 PM
Last Edited Or Replied at :Sunday 07th of July 2013 01:12:32 AM
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as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the vehicle's operating environment, and is an ideal application for a mass sensor. (See stoichiometric, ideal gas law, and density.)

There are two common types of mass airflow sensors in usage on gasoline engines. They are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on gasoli..................[:=> Show Contents <=:]



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