NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Taking Measure

Just a Standard Blog

C.W. Clark

white pi symbol on a grey field made up of the numbers of pi

The Life of (Buckingham) Pi

What do the following topics have in common? Pricing models for parking reservation systems. The mechanics of human walking. The die-down of water waves in sea
Hubbard/Meggers Periodic Chart of the Atoms

The Periodic Table: It’s Elementary!

Of all the many useful and interesting periodic tables on the Internet—the periodic tables of the animals, vegetables, and minerals—and U.S. Presidents, Vienna®
Was this page helpful?