Imeasurable & Indistinguishable wonders of $cience.

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Please avoid using plastic..

We need your help..

Dear Friends,

Our friend Yeldho Ouseph has to undergo a kidney transplantation as his kidney is found 90% damaged and has to do dialysis thrice a week.The surgery is proposed at CMC,Vellore for which approximate cost will be nearly 15 Lakhs.
His family is unable to raise such a huge amount.We solicit financial assistance of all kind hearted friends to help so that the surgery can be done on time.We have opened account in his name for this cause.
Name : *YELDHO OUSEPH*
Account No: *12070100174712*
*FEDERAL BANK*
VADASSERIKARA BRANCH
IFSC: *FDRL0001207*
Beneficiary Mobile Number- *8943370728*
For any queries, contact
Aravind-9400724113
Alfred- 9400396943
Ankith-9400533393

- FISAT Mech 11-15

Defination

A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.

Working Principle:
Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve design, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero-offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high-performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc.

How fingerprint scanners work: optical, capacitive, and ultrasonic

Fingerprint sccaners aren’t just reserved for the very top-tier of smartphones these days, even your reasonably priced mid-ranger can come packing in the additional security hardware. Heck, even a number of sub-$150 devices these days coming packing the technology. Technology has moved on a lot from the early days too, becoming faster and more accurate in their readings.

With all that in mind, let’s take a look at how the latest fingerprint scanners work and what the differences are.

Optical scanners

Optical fingerprint scanners are the oldest method of capturing and comparing fingerprints. As the name suggests, this technique relies on capturing an optical image, essentially a photograph, and using algorithms to detect unique patterns on the surface, such as ridges or unique marks, by analysing the lightest and darkest areas of the image.

Just like smartphone cameras, these sensors can have a finite resolution, and the higher the resolution, the finer details the sensor can discern about your finger, increasing the level of security. However, these sensors capture much higher contrast images than a regular camera. These scanners typically have a very high number of diodes per inch to capture these details up close. Of course, it’s very dark when your finger is placed over the scanner, so optical scanners also incorporate arrays of LEDs as a flash to light up the picture come scan time. Such a design is a bit bulky for a smartphone though, where slim form factors are important.

The major drawback with optical scanners is that they aren’t difficult to fool. As the technology is only capturing a 2D picture, prosthetics and even other pictures of good enough quality can be used to fool this particular design. This type of scanners really isn’t secure enough to trust your most sensitive details to. It’s also slowly being phased out these days.

Faith.....

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Science of Stupid Q is confused but thanks to host Manish Paul and science, he’s going to figure out the mysteries of the universe. Mon - Fri, 9 pm, only on Nat Geo. To set a ...

Happy Birth Day Reetika.....

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http://www.livescience.com/59278-turn-any-flat-surface-into-touchpad.html

Spray-On Touch Screens? How to Turn Any Flat Surface into a Touchpad With just a can of spray paint, researchers can turn flat surfaces of any shape or size into touchpads.

What is Electrostatic Precipitator (ESP) and it’s working?

Construction:-
of thin wires called discharge or emitting electrodes and other set called collecting electrodes in the form of pipes or plates. The emitting electrodes are placed in the centre of pipes or midway between two plates and are connected usually to negative polarity of high voltage D.C. source of the order of 25-100kV. The collecting electrodes are connected to the positive of the source and grounded.

This is the most preferred BOE Preparation Book.
Being a power plant engineer one should read this Book at least once ,This book covers Subjects of Boiler,Turbine,D.M Plant, CHP & Efficiency calculation.

Working of ESP:-
The high voltage direct current is connected between the framework and the ground, thereby creating a strong electrical field between the wires in the framework and the steel curtains. The electrical field becomes strongest near the surfaced of the wires, so strong that an electrical discharge –“the corona discharge”-develops along the wires. The particles of dust are removed by an intermittent blow usually referred as rapping. This causes the dust particles to drop into dust hoppers situated below the collecting electrodes.
steps in the process of precipitation:-
• Ionization of gases and charging of dust particles.
• ii) Migration of the particle to the collector.
• iii) Deposition of charged particles on the collecting surface
• iv) Dislodging of particles from the collecting surface.

Parts of ESP:-
1.Precipitator Casing- It is an all-welded steel construction, assembled from prefabricated wall and roof panels using panel construction. The precipitator casing is designed for horizontal gas flow. The casing is thermally insulated by insulation.
2. Hoppers -The hoppers are of pyramidal construction type with dry or wet conveying system. The valley angle of the hoppers (angle between hopper corner and horizontal) is never less then 55° and offer more to ensure easy dust flow down to the feed out fl**ge. To ensure free flow of ash into the disposal system lower portions of the hoppers are provided with electrical heaters with thermostatic control
3. Gas Distribution System-The gas velocity in the precipitator is approximately 1/10th of the velocity in the ducting before the precipitator. It is therefore essential that the precipitator have arrangements to give an even distribution over its entire cross sectional area. Special gas distribution screens are
therefore located at the inlet of the precipitator. The screens are of modular design and hang within a framework in the precipitator-casing inlet.
4. Collecting Electrode System-The collecting plates are made of 1.6-mm steel plate and shaped in one piece by roll forming. The 'G' profiled collecting electrode is provided. The upper edge of the connecting plates are provided with hooks, which are hung from support angles welded to the roof structure. The lower edge of each plate has a shock receiving plate, which is securely guided by the shock bar arrangement. This results in a stable collecting
system similar to the emitting system.
5. Emitting Electrode System-Wire type/pipe type electrodes are used for emitting electrode. Wire type electrodes give the best current distribution. Therefore they are the ones best suited for difficult dusts with high electric resistivity.
6. Rapping System -Each collecting plate has a shock receiving plate at its lower end. The plates in one row of each field are interfaced to one another by these shock receiving irons resting in slots in the shock bar thus maintaining the required spacing. The shock bars are kept in alignment with guides located at the front and rear of each shock bar. Each collecting plate is hung on an eccentric positioned hook to ensure that the shock-receiving of the collecting plate is constantly resting against the shock bar. In this manner the highest possible energy is transferred to the collecting plate when the 'tumbling hammer or MIGI(magnetic impulse gravitational impact) coil hits the corresponding shock bar. The system employs 'tumbling hammers which are mounted on a horizontal shaft in a staggered fashion, with one hammer for each shock bar. As the shaft rotates slowly each of the hammers in turn over balances and tumbles, hitting its associated shock bar. The shock bar transmits the blow simultaneously to all of the collecting plate in one row because of their direct contact with the shock bar. A uniform rapping effect is provided for all collecting plates in one row. The rapping frequency should be as low as possible in order to minimize dust losses from rapping. The frequency of each rapping system is adjustable within a wide range.
7. Rectifier Handling- The rectifier-control provides all the modern controls and has a spark rate controller unit which controls spark rate of 5 to 10 sparks per minute to maintain optimum dust collection
efficiency. The rectifier system provides a smoother control of output current from 10% to 100%
of the rated value and also maintains the constant current output.
Types of ESP:-
 Dry or wet (irrigated)
 ii) Horizontal or vertical flow
 iii) Plate type or tubular type

WISH YOU ALL A HAPPY anD PROSPEROUS NEW YEAR AHEAD......

just see the difference..!!!

This Man Didn't Get Window Seat; How He Used JNU Azaadi Speech Is Going Viral It's something you definitely can't miss to watch

Invention :)

HowStuffWorks "Hydrogen-Boosted Gasoline Engine Overview" The hydrogen-boosted gas engine is a fuel-saving technology that has the potential to be a viable option. Learn how hydrogen-boosted gas engines work.

What is the definition of "centrifugal compressor"?
A type of dynamic compressor that compresses air and expels it with a centrifugal force from a rotating wheel with radial vanes. Centrifugal compressors are often used for fans and cooling units.

Life has never promised you anything... Nor has Destiny.. But people did..
Some said they would never leave you.. Lie!
Some said they would love you until death.. Lie!
Some said you were the most precious one.. Lie!
Life is made of such sweet Lies...
All that matters is, how you faced the time you finally realised those were just lies...
We may ask, "Wouldn't life be much better without these lies?"
But the truth is, the times you lived on those big lies were the only times you lived..!!