Learn node: Solder as an amalgam of open online sources

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Posted on 5th March 2008 by Judy Breck in chemistry | engineering | general science | sciences

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solderdiagram.jpg

The triangle of information shown in this learn node is a phase diagram thermodynamic calculation for solder Bi-Pb-Sn. So who care about something like that? In the advancing complexity of metallurgy, depth of detail is important. This is the explanation of the NIST host of the diagram, whose Web site explains the mission:

The NIST Metallurgy Division is working closely with materials suppliers and users to develop the measurement and standards infrastructure needed in diverse technological areas – from steelmaking to the fabrication of nanostructured multilayers for magnetic recording heads. . . .

solderiron.jpgLearning about solder might seem more likely to involve technique, like that offered in the PDF which contains the illustration of “Tinning the soldering iron” from About Soldering—making Clip Leads—CLK from MIT’s Open Courseware. A sample of third sort of soldering knowledge available online is this popular Soldering Guide, a tutorial supported by Google ads.

Within the open Internet, patterns of related ideas for the subject of solder can be an amalgam from diverse sources.

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Learn how the Fed creates money

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Posted on 17th January 2008 by Judy Breck in business

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money.jpgAn online tutorial called FED 101 at the website of the Federal Reserve System of the United States includes a section called “How does the Fed create money?” The illustration here is from an animation of the some effects of interest rates. It links to a full page that explains and illustrates inflation. There are several other explanations of the fundamental elements of the workings of the Federal Reserve System in the FED 101 material.

desk.jpgThere is a concise definition of the Federal Reserve System on the website of its bank in San Francisco. The theme of the definition: “The Nation’s Central Bank.” Topics include “Why We Need a Central Bank” and “The Fed is First and Foremost the Nation’s Money Manager.”

Both of these websites contain many informational sections and links out to other excellent open, public access sources on the Fed, an institution at the center of the United States economy and of enormous influence on money across the world.

Learn node: Chameleons, optics and the most distinctive reptile eyes

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Posted on 12th January 2008 by Judy Breck in animals | biology

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Chameleon

The image for this learn node is a chameleon from an animation in the terrific tutorial Optics for Teens created and hosted online by the Optical Society of America. If a look through the tutorial makes you curious to learn more about optics, a full Optics course is offered by MIT Open Courseware (tree illustration from Lec# 3).Tree If your interest is roused to know more about chameleons the report of scientists developing computer models for learning about chameleon habitats in Madagascar is offered here by the American Museum of Natural History. And you can learn a lot more about these amazing lizards at the San Diego Zoo’s Chameleon page. There the optical mastery of chameleons is described:

The chameleon’s eyes are the most distinctive among the reptiles. Each eye has a scaly lid shaped like a cone, with only a small, round opening in the middle for the pupil. The chameleon can rotate and focus its eyes separately to look at two different objects at the same time! This gives it a full 360-degree view around its body. When the chameleon sees prey, both eyes can focus in the same direction to get a clearer view.

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Learn node: Algebra I, real numbers, rational numbers, irrational numbers

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Posted on 9th January 2008 by Judy Breck in math

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universe.jpgIllustrating this learn node is an image from a game of sorting out different kinds of numbers in the Monterey Institute’s National Repository of Online Course: Introductory Algebra 1A, Unit 1, Lesson 1. A detailed explanation of The Real Number System is available from an online algebra text by James Brennan of Boise State University. Purplemath’s Number Types page explains the classification of numbers. These places to learn the ways numbers are categorized each are connected to other open sources for related subjects and ideas. Purplemath offers reviews of Other Sites of Interest.

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Learn node: The roles of the business analyst mapping value streams

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Posted on 7th January 2008 by Judy Breck in business

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stream.jpg From introducing the concept, to developing the subject, to real world examples, to advanced “how-to,” this learn node provides an open content concept cluster for the business education topic: mapping value streams. The open courseware from the University of California at Irvine on the subject Fundamentals of Business Analysis is an introduction to the roles of the business analyst. The Irvine course is a primer and review for the basic roles of the business analyst.

The illustration shown with this learnode is from the Irvine course’s lesson on value stream mapping. To learn more about that subject, the Wikipedia entry on Value Stream Mapping is a good next step for open (no cost) information and links out to more learning resources. Links Wikipedia provides offer real world examples of value stream mapping and a business review website’s Step by Step Guide to Value Stream Mapping.

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