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Fundamentals of Die Casting Design.pdf

November 7, 2009 · Filed Under Mechanical & Industrial Engineering · Comment  · Tags: , , , ,

Taken from Abstract: Die-casting engineers have to compete not only with other die-casting companies, but also against other industries such as plastics, and composite materials. Clearly, the ”black art” approach, which has been an inseparable part of the engineer’s tools, is in need of being replaced by a scientific approach. Excuses that “science has not and never will work” need to be replaced with “science does work”. All technologies developed in recent years are described in a clear, simple manner in this book. All the errors of the old models and the violations of physical laws are shown. For example, the “common” pQ2 diagram violates many physical laws, such as the first and second laws of thermodynamics. Furthermore, the “common” pQ2 diagram produces trends that are the opposite of reality, which are described in this book.
The die casting engineer’s job is to produce maximum profits for the company.
In order to achieve this aim, the engineer must design high quality products at a minimum cost. Thus, understanding the economics of the die casting design and process are essential. These are described in mathematical form for the first time in this volume. Many new concepts and ideas are also introduced. For instance, how to minimize the scrap/cost due to the runner system, and what size of die casting machine is appropriate for a specific project.
The die-casting industry is undergoing a revolution, and this book is part of it. One reason (if one reason can describe the situation) companies such as Doehler Jorvis (the biggest die caster in the world) and Shelby are going bankrupt is that they do not know how to calculate and reduce their production costs. It is my hope that die-casters will turn such situations around by using the technologies presented in this book. I believe this is the only way to keep the die casting professionals and the industry itself, from being “left in the dust.”

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Hydrodinamics of Pumps.pdf

October 22, 2009 · Filed Under Mechanical & Industrial Engineering · Comment  · Tags: , , , , ,

Taken from Abstract: The subject of this monograph is the fluid dynamics of liquid turbomachines, particularly pumps. Rather than attempt a general treatise on turbomachines, we shall focus attention on those special problems and design issues associated with the flow of liquid through a rotating machine. There are two characteristics of a liquid that lead to these special problems, and cause a significantly different set of concerns than would occur in, say, a gas turbine. These are the potential for cavitation and the high density of liquids that enhances the possibility of damaging unsteady flows and forces.

Principles of Microeconomics.pdf

October 21, 2009 · Filed Under Social Economic · Comment  · Tags: , , , , ,

Microeconomics is a branch of economics that studies how individuals and firms make decisions to allocate limited resources, typically in markets where goods or services are being bought and sold.

Evolution of Physical Oceanography.pdf

October 12, 2009 · Filed Under Oceanography · Comment  · Tags: ,

Taken from Introduction: We have tried to tie the individual chapters together in a variety of ways. The book includes a general index of subjects and names, and also a reference list that gives the page number for each citation in the text. We hope that these features will make possible a rapid’ entry into the book by anyone seeking a discussion of a particular piece of work. Special care was taken in compiling the reference list to correct many common miscitations, some of which extend back nearly 100 years. The reader will notice overlap between chapters and even some dispute among them. We regard this as inevitable and healthy in a field undergoing the ferment of active progress. A consequence of this activity is that we did not attempt to impose a common notation upon the book, but we did ask the authors to avoid idiosyncratic schemes.
In the context of the question to the authors posed above, we are impressed in reading these chapters with how far we have come. When Henry Stommel entered physical oceanography in the early 1940s, the three authors of The Oceans, H. U. Sverdrup, Martin W.
Johnson, and Richard H. Fleming, could cover authoritatively, in one volume, the entirety of oceanography-physics, chemistry, biology, and geology. Today no single volume could cover one of these fields, and probably no three authors would have the temerity to attempt comprehensive descriptions of any. But we believe that the reader will find here a broad description of the present state and the historical evolution of physical oceanography.

Skoda Roomster.pdf

October 12, 2009 · Filed Under Skoda · Comment  · Tags: ,

Taken from “Real Life Technology”: The High-line instrument panel features 4 analogue indicators, 19 indicator lights, segment display (distance travelled, time) and a large Maxi DOT display showing data from the on-board computer such as outdoor temperature, fuel consumption and mileage. The Maxi DOT further displays easily legible information on fuel reserve, oil pressure, cooling liquid level etc. The advantages of the Maxi DOT include the ability to communicate information from the radio, telephone and navigation system.




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