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Showing posts from April 12, 2010

How to mount a pen drive in linux..

1. mind u one thing only root (administrator) can do so . 2. crtl+alt+f1 for entering the text mode. 3. Login as root 4. attach a pen drive 5. type the following commands: 6. mount(space)/dev/sd(no space b/w dev and sd) then press tab twice u will see sda,sda 1,sdb and so on ..choose urs the last one is urs mind u 7. suppose sda1is urs device then u will have to type further as: 8. mount(space)/dev/sda1(space)/mnt (press enter) 9. then type cd(space)/mnt(press enter) 10. then type ls(press enter) 11. the contents of ur pendrive will get displayed. 12. u r done ...

Brain Machine Interface-

THE IDEA It all came to mind from the sci-fi movie “The Matrix”, those rebels putting on the computer cords at the back of the neck—probably between the occipital bone at the base of the skull, and the first neck vertebra. The bioport (that’s what the technology was called in movie) was a way of giving the Matrix computers full access to the information channels of the brain. The rebels use the bioport to load new skills into their colleagues' brains—writing directly into permanent memory. Making it possible for rebels to learn things in seconds like flying a helicopter. Think if this could materialize into reality. No need to go to colleges just download the the whole semester books into your brain, you could read your favorite novels in seconds, learn “Kung-Fu”, possibilities could be endless. FROM VIRTUOSITY TO REALITY Moving to reality, many researches are actually going on to explore the possibility of the man and machine merger. Scientists have already got some breakthrough

Cable Television

Cable television is a system of providing television to consumers via radio frequency signals transmitted to televisions through fixed optical fibers or coaxial cables . Traditionally television broadcasting (via radio waves) uses over-the-air method in which a television antenna is required. Earlier there was no technology to record programs. After the invention of camera, they recorded the program and transmitted it via an electric current to a TV set, where the antenna converted the electrical pulses back into the original images and sound. These signals were actually transmitted over radio frequencies, which travel in straight lines. So, if TV wasn’t in the “line of sight” of the source, the signal was blocked, and TV screen would be blank. As a result, the only people who had TV’s in those days (back in the 1950s), were those who lived on higher ground, or were close to the source of the program. But People who lived in the valleys of Pennsylvania (U.S) came up with a creative

microprocessor 80286, 80386 , 80486, pentium

80286 microprocessor: Basically this microprocessor is an advanced version of 8086. So before starting with 80286 we must know something about 8086. Intel 8086 is a 16 bit microprocessor intended to be used as a CPU in a microcomputer. The term 16 bit means that its arithmetic logic unit, its internal registers, its instructions are designed to work with 16 bit binary words. It has a 20 bit address bus and 16 bit data bus. So this means that it can address any one of the 1048576 memory locations and it can read data from or write data to the memory and ports either 16 bit or 8 bit at a time. Here the word is stored in two consecutive memory locations. Also one thing to note here is that if the first byte of the word is stored at even address, the 8086 can read the entire word in one operation. Alternatively if the first byte of the word is at odd address, then the 8086 will read the first byte in one operation and the second byte in the second operation. 8088 is just similar to 8086 bu

“ WITRICITY ”

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INTRODUCTION: Witricity, standing for wireless electricity, is a term coined by MIT researchers, to describe the ability to provide electricity to remote objects without wires. It is based upon coupled resonant objects to transfer energy between objects without wires. The system consists of a Witricity transmitter, and devices which act as receivers. 7 June 2007, Massachusetts Institute of Technology (MIT), Institute for Soldier Nanotechnologies, Imagine a future in which wireless power transfer is feasible: cell phones, household robots, mp3 players, laptop computers and other portable electronics capable of charging themselves without ever being plugged in, freeing us from that final, ubiquitous power wire. Some of these devices might not even need their bulky batteries to operate. Like radio receivers, the devices must be in range of the transmitter. Unlike the conduction-based systems built by Nikola Tesla in the late 19th century, Witricity uses resonant magnetic fields to re

DESIGN OF ARITHMETIC AND LOGICAL UNIT

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The ALU is the part of the microprocessor that handles all Boolean and mathematical operations. However, exploring an actual ALU from one of the current microprocessors is too complex. Thus, I have taken a more simplified design that, although limited in functionality, will show you the general picture. I have divided the diagram into three sections: Logical Unit, Decoder, and Full Adder. The inputs are A, B, F0, F1, and Carry In. There are also 3-input AND gates and a 4-input OR gate. They are basically the same as the 2-input gates, except that the 3-input AND gate only outputs a 1 if all 3 inputs are 1s, and the 4-input OR gate always outputs a 1, except when all inputs are 0s. 1 bit Arithmetic and logical unit The F inputs control the enable lines. As you can see, no matter which of the four possible combinations of F inputs is put in, only one (and each time different) enable line will be "turned on." Thus, the function of the decoder subpart is to figure

Electronic Reconnaissance, ELECTRONIC COUNTERMEASURES (ECM), ELECTRONIC COUNTER-COUNTERMEASURES (ECCM)

Electronic Reconnaissance: Reconnaissance aims to give to field players, at a tactical level, the information they need: Where are (and where will be) the targets, what are their defenses, what military means to use, what kind of weapon is the best suited, when to conduct the attack, etc. Due to short reaction time in Air Defense, this task is generally carried out directly by the AEW system. In fact in some cases the AEW platform is a C3I system itself that controls the fighters in real time. For ground targets, due to slower evolution of the situation and to a more complex environment (collateral damage avoidance, mask), a specific mission is needed. This mission uses SAR/MTI systems either fitted in POD carried by a manned aircraft (business jet or fighter), or carried by an unmanned vehicle (UAV). The main objective of these missions is to re-acquire the targets (in case they are moved as Ballistic Missile Launchers), and to identify and locate them accurately. Once again fusion