Numerical control has caused a virtual revolution in the discrete metal parts manufacturing industry. The success of NC has led to number of extensions of Numeric Control concepts and technology. Four of the important developments are the following:

Direct numerical control (DNC).
Computer numerical control (CNC).
Adaptive Control.
Industrial robots.
Direct Numerical Control(DNC)
There are number of problems inherent in conventional machiningwhich are motivated machine tool builders to seek imprivements in the basic NC system. Among the diffi ....etc

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Knock is the result of the rapid combustion of the end-gas ahead of the flame front which undergoes chemical reactions prior to normal combustion. This cause high frequency pressure oscillations inside the cylinder that produce the sharp metallic noise called knock.

Two theories have been postulated to explain the origin of knock :

1. The autoignition theory which states that when the air/fuel mixture in the end- gas region is compressed to sufficiently high pressure and temperature the fuel oxidation process - starting with the preflame chem ....etc

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CMOS circuits utilize complementary MOSFETs, i.e; NMOS and PMOS devices together in various patterns to create functional blocks like AND or OR gates. However the problem with these types of CMOS circuits is that they are inherently low power circuits. They cannot handle large currents. So when your block needs to have a large fan out (need to drive a large no of outputs, i.e; more current required) CMOS circuits fail. That is why we use BiCMOS. They are very similar to CMOS circuits except for the BJT(Bipolar Junction Transistor) output stage. ....etc

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thnk you so much.,i am very thank ful to you.hope u continue ur hlp in future time ....etc

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NMOS - N-type metal-oxide-semiconductor logic uses n-type field effect transistors (MOSFETs) to implement logic gates and other digital circuits. These nMOS transistors operate by creating an inversion layer in a p-type transistor body. This inversion layer, called the n-channel, can conduct electrons between n-type source and drain terminals. The n-channel is created by applying voltage to the third terminal, called the gate. Like other MOSFETs, nMOS transistors have four modes of operation: cut-off (or sub-threshold), triode, saturation ....etc

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difference between chopper fed drives and converter fed drives pdf

If the source of supply is d.c. (for example in a battery vehicle or a rapid transit system) a chopper-type converter is usually employed. The basic operation of a single-switch chopper was discussed in topic 2, where it was shown that the average output voltage could be varied by periodically switching the battery voltage on and of for varying intervals. The principal difference between the thyristor-controlled rectifier and the chopper is that in the former the motor current ....etc

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I am new to html5. I was try to know the main and pro-grammatical differences between html4 and html5. And way we use htnl5 with css3. Any differences are there in using javascript in html4 and html5.
I got a chance on htnl5 by reference. I know html4 well. but given period for inter view was small. Please give support to me. ....etc

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to get information about the topic plc and scada full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-plc-scada--25356?pid=54726&mode=threaded ....etc

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In any analysis of innovation, 802.11 is truly a prime number. This evolving standard, better known as Wi-Fi, is the it protocol that s won the same spectacular hype as (whisper it softly) the Internet itself. Oh, the good old days. I miss them.

But while Wi-Fi undeniably inspires that intoxicating blend of expectation and excitement that leads to entrepreneurial excess, it s also the kind of technological platform that invites the best ideas. Wi-Fi s combination of well-crafted technical standard and regulation-free deployment offers a ....etc

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Boiler Mountings
Boiler mountings are components used for ensuring the safety of boiler operation.
These are generally mounted on the surface of the boiler.
Control fluid parameters at the inside of the boiler shell.
The mountings are the essential part of a boiler, without which boiler operation is impossible.
Examples: Pressure gauges, Water level indicator, Safety valves, Stop valve, Fusible plug, Blow off cock, etc.
Boiler Accessories
Accessories are the auxiliary items required for proper operation of boiler and improve the efficien ....etc

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