FUEL CELLS-Evolving Concepts and Developments

Introduction
Output of conventional batteries are limited.
They are polluting.
Continuous operation results in fall in efficiency.
Output not stable under long durations of operations.

Fuel Cells
An Electrochemical energy conversion device
Produces electricity from external fuel and oxidant.
Can operate virtually continuously as long as the necessary flows are maintained.

General Structure
Two electrodes sandwiched around an electrolyte
Hydro ....etc

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INTRODUCTION
Since the conventional solid gun propellants have reached the saturation level in terms of energy output, a need exists for the development of high performance propellants for futuristic gun ammunition to propel hypervelocity projectiles. Hypervelocity guns are the guns having muzzle velocity in excess of 2000 m/s. Modern tank guns have muzzle velocity in the range of 1600 “ 2000 m/s. With continuous improvement in armour technology, improved weapons with high muzzle velocity are under ....etc

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Abstract Data Types and Encapsulation Concepts
The Concept of Abstraction
Introduction to Data Abstraction
Design Issues for Abstract Data Types
Language Examples
Parameterized Abstract Data Types
Encapsulation Constructs
Naming Encapsulations
The Concept of Abstraction
An abstraction is a view or representation of an entity that includes only the most significant attributes
The concept of abstraction is fundamental in programming (and computer science)
Nearly all programming languages support proces ....etc

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Marketing in Transition - Concepts & Practices

Since the beginning of the phenomenon of the marketing, there have been many changes in the business scenario, practically and academically. Over a long period of time, different concepts and conceptions have come into being and have been replaced by some other ones, yet the two aspects that have remained unchanged are marketing and customer. Marketer plans and directs all the efforts towards the customer, and they know it intrinsically that their su ....etc

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Object-oriented techniques achieve further reusability through the encapsulation of programs and data. The techniques and mechanisms we shall discuss here are primarily concerned with paradigms for packaging objects in such a way that they can be conveniently reused without modification to solve new problems.

Instantiation and Object Classes
Instantiation is perhaps the most basic object-oriented reusability mechanism. Every programming language provides some built-in data types (like integers and floating-point numbers) that can be instant ....etc

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Object-oriented techniques achieve further reusability through the encapsulation of programs and data. The techniques and mechanisms we shall discuss here are primarily concerned with paradigms for packaging objects in such a way that they can be conveniently reused without modification to solve new problems.

Instantiation and Object Classes
Instantiation is perhaps the most basic object-oriented reusability mechanism. Every programming language provides some built-in data types (like integers and floating-point numbers) that can be instant ....etc

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