History of Polymer and Plastics

History of Plastics and Polymers

Plastics are polymers. What is a polymer? The most simple definition of a polymer is something made of many units. Think of a polymer as a chain. Each page link of the chain is the mer or basic unit that is made of carbon, hydrogen, oxygen, and/or silicon. To make the chain, many links or mers are hooked or polymerized together. Polymerization can be demonstrated by linking strips of construction paper together to make paper garlands or ....etc

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INTRODUCTION
Rapid prototyping automates the fabrication of a prototype part from a three- dimensional (3D) CAD drawing. This physical model conveys more complete information about the product earlier in the development cycle. The turnaround time for a typical rapid prototype part can take a few days. Conventional prototyping may take weeks or even months, depending on the method used. Rapid prototyping can be quicker more cost effective means of building prototypes as opposed to conventional methods.
F ....etc

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STEREOLITHOGRAPHY CURE PROCESS MODELING


INTRODUCTION
In this chapter, the stereolithography (SL) technology is introduced, the objective of
this work is addressed, and the strategy to achieve the goal is demonstrated.

Introduction to Stereolithography
Stereolithography is currently the most widely used process in the rapid prototyping
and manufacturing (RP&M) field. “It translates computer aided designs (CAD) into solid
objects through a combi ....etc

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History of Indian Advertising



history


1950’s

Watershed years for Indian advertising
Industrial revolution in the Nehruvian era
1st survey of the rural market (Wood)
Burmah Shell vans used for advertising
Cinema advertising began
Kolkata gets the privilege of India’s first ad club
Leading ad agency - Press Syndicate
National created the Murphy baby
....etc

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Stereolithography

Stereolithography, also known as 3-D layering or 3-D printing, allows you to create solid, plastic, three-dimensional (3-D) objects from CAD drawings in a matter of hours. Whether you are a mechanical engineer wanting to verify the fit of a part or an inventor looking to create a plastic prototype of an invention, stereolithography gives you a fast, easy way to turn CAD drawings into real objects.

3-D printing is a very good example of the age we live in. In the past, it could conceivably take months to prototype a part ....etc

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Stereolithography, also known as 3-D layering or 3-D printing, allows you to create solid, plastic, three-dimensional (3-D) objects from CAD drawings in a matter of hours. Whether you are a mechanical engineer wanting to verify the fit of a part or an inventor looking to create a plastic prototype of an invention, stereolithography gives you a fast, easy way to turn CAD drawings into real objects. 3-D printing is a very good example of the age we live in. In the past, it could conceivably take months to prototype a part -- today you can do it h ....etc

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History of 64-bit Computing: AMD64 and Intel Itanium Processors
64-bit History
• “640K ought to be enough for anybody” – Bill Gates
• 64-bit twice as fast as 32-bits?
• Benefits of 64-bit technology
• Applications of 64-bit technology
AMD64 Outline
• AMD Athlon 64 Specifications
• Operating Modes
• Register overview
• DDR controller and Hypertransport
AMD Athlon 64 Specifications
Infrastructure Socket 754
Number of Transistors 105.9 million
64-bit Instruction Set ....etc

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The History of PHP

The Creation of PHP

The first version of what came to be known as PHP was created in 1995 by a man named Rasmus Lerdof. Rasmus, now an engineer at Yahoo!,
He decided to call this technology Personal Home Page/Forms Interpreter. The technology provided a convenient way to process web forms and create content.
The name Personal Home Page/Forms Interpreter was later shortened to PHP/FI and eventually renamed to represent PHP: Hypertext Preprocessor.

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This article is presented by:
Sudhir Kumar Routray
The University of Sheffield
History of Electronics

Abstract
In this paper the history of electronics has been represented in a chronological order along with the discoverer/inventor, who actually is responsible for that. The effects of electronics on the contemporary society are very significant and without the study of the effects the history is incomplete. Thus the effects on the economy, computing and the society a ....etc

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The History and State of the Art of
Variable-Speed wind Turbine
Technology

ABSTRACT
Early wind turbines used for performing mechanical work (pumping, grinding and cutting) optimized aerodynamics by being allowed to run at variable speed. Some of the earliest DC electric wind turbines were allowed to run at variable speed. With the advent of gridconnected AC turbines, rotational speeds were limited in order to control the wind turbine AC frequency output to equal the grid frequency. With the advent of se ....etc

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