Poly Fuse

Polyfuse is a new standard for circuit protection. It is resettable. Many manufacturers also call it polyswitch or multifuse. Polyfuses are not fuses but polymeric positive temperature co-efficient (PPTC) thermistors.

Current limiting can be accomplished by using resistors , fuses , switches or positive temperature co-efficient devices. Resistors are rarely an acceptable solution because the high power resistors that are usually required are expensive. One-shot fuses can be used, but they might fatigue, and they must be replaced ....etc

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Polyfuses is a new standard for circuit protection. It is re-settable by itself. Many manufactures also call it as Polyswitch or Multifuse. Polyfuses are not fuses but Polymeric Positive temperature Coefficient Thermistors (PPTC). We can use several circuit protection schemes in 'power supplies to provide protection against fault condition and the resultant and over temperature damage. Current can be accomplished by using resistors, fuses, switches, circuit breakers or positive temperature coefficient devices.Resistors are rarely an acceptable ....etc

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POLY JET PROCESS

PRESENTED BY
K.SRI RAM VIKAS
V.S.R.KISHORE.B
D.M.S S.VH COLLEGE OF ENGINEERING, Machilipatnam, AP- 521002


Different types of RP methods

The Poly jet process
Stereo lithography (SLA for stereo lithography apparatus),
Selective laser sintering (SLS),
Fused deposition modeling (FDM),
Laminated object manufacturing (LOM),
Inkjet systems and three dimensional printing (3DP).
Solid Ground Curing


Rapid prototyping is a layer -based fabrication that quickly create ....etc

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Camelina sativa is an oilseed crop and it might be used as fuel in aircrafts in the near future. A study conducted at Michigan Technological University claimed that Camelina has shown to be one of the more promising alternatives to petroleum jet fuel. They studied the whole process i.e. from planting to airplaneâ„¢s tailpipe. David Shonnard, Robbins Chair Professor of Chemical Engineering, studied the carbon dioxide emissions of jet fuel made from Camelina oil ....etc

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Abrasive Jet Machine

Introduction
Abrasive jet machining (AJM) is a non-traditional machining
process that can machine material without generating heat and
shock.
Abrasive jet machining (AJM) is commonly used for Cutting,
Cleaning, Drilling and Etching operation

Mechanism of AJM

Fine particles are accelerated in
gas stream .


The particles are directed towards
the focus of machining.

As the particle impacts the surface,
....etc

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Water Jet cutting services make use of a super high pressure stream of water that carries an abrasive grit. This abrasive mixes with the water through a venturi effect in what is commonly called the ?focusing tube? just prior to cutting. This mixture of water and abrasive grit exit the focusing tube at speeds of approximately mach 2.5. Cutting pressures range between 45,000 to 60,000 psi for standard cutting models. For brittle, fragile, or delicate materials, piercing pressures range between 15,000 to 20,000 psi, and resume the higher cutting ....etc

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Abresive Jet Machine



It is a newly developed technology used in industrial countries. This is adopted for machining operations.


Features

In this machine a high velocity of abrasive stream is used for machining. The abrasive particle have a vibration of about 50 hertz is mixed with high pressure gas or air in the mixing chamber. Then the stream is emerges through a small nozzle mounted on a fixture to the work piece.
Variable in abrasive jet machine
The variables that influence the rate of metal removal and accuracy of machining ....etc

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NO-MOVING-PART
HYBRID-SYNTHETIC JET ACTUATOR
Article Outline
1. Introduction
2. The actuator model
2.1. General
2.2. Amplifier
2.3. Feedback loop
3. Results
3.1. Oscillation frequency
3.2. Modified Strouhal number
3.3. Constant Strouhal number regime
3.4. Constant propagation velocity regime
4. Conclusions
Acknowledgements
References
1. Introduction

Actuators based on the synthetic jet idea are currently becoming of increasing importance for a number of applications, especially involving control of flo ....etc

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