John's Junk Drawer - Science & Tech

A New (well, for me) Oscilloscope for the Bench!

nospam@example.com (John) — Thu, 27 Oct 2011 12:31:10 -0700

The scope has arrived!

It came in the mail yesterday. A used, JDR Instruments, 35 MHz, dual trace scope for $80.00 (Shipping included) on eBay!

It had two obvious problems.

No horizontal positioning — I was able to fix that by following wires and traces back from the front panel.
The brightness is at full all the time — not able to fix that without schematics.

I spent a bit of time with it, and while it needs some calibration, I haven't been able to find anything else wrong. Also cool, it has a Z input in the back, which means I'll be able to play asteroids on it

-djr

Dennis Ritchie, Creator of the C programming language, dead at 70

nospam@example.com (John) — Fri, 14 Oct 2011 14:51:16 -0700

main()
{
    printf("goodbye, world\n");
}

Alfred Russel Wallace

nospam@example.com (John) — Fri, 25 Mar 2011 11:33:23 -0700

"There is, I conceive, no contradiction in believing that mind is at once the cause of matter and of the development of individualised human minds through the agency of matter. "

— Alfred Russel Wallace

Lunar Eclipse 21-Dec Totality starts at: 2:41 Eastern

nospam@example.com (John) — Sat, 18 Dec 2010 18:04:17 -0800

Lunar eclipse (total from all of U.S.) Tuesday 21-Dec. Begins: 01:32 (am - EST). Totality is achieved at 02:41 and lasts for 72 minutes.

Best time to look?

At 03:17 am EST the Moon will be in deepest shadow, displaying the most fantastic shades of coppery red.

Why Red?

From the article at NASA:

" A quick trip to the Moon provides the answer: Imagine yourself standing on a dusty lunar plain looking up at the sky. Overhead hangs Earth, nightside [facing you], completely hiding the sun behind it. The eclipse is under way. You might expect Earth seen in this way to be utterly dark, but it's not. The rim of the planet is on fire! As you scan your eye around Earth's circumference, you're seeing every sunrise and every sunset in the world, all of them, all at once. This incredible light beams into the heart of Earth's shadow, filling it with a coppery glow and transforming the Moon into a great red orb. "

Last time a lunar coincided with solstice?

1638 DEC 21, Next time it will happen? 2094 DEC 21

That's Life

nospam@example.com (John) — Fri, 09 Jul 2010 00:15:00 -0700

As funny as it may seem...
Some people get their kicks
stomping on a dream...

Amazing --Actual-- Image of A Single Molecule

nospam@example.com (John) — Thu, 18 Feb 2010 21:15:43 -0800

IBM has found that picking up a single carbon-oxide (CO) molecule onto the tip of their AFM (Atomic Force Microscope) allows them to get a much sharper "point" with which to obtain much sharper images of atomic scale entities. This image is simply amazing...

View the IBM Press Release (w/video)

-djr

The "science" of kissing up

nospam@example.com (John) — Tue, 28 Oct 2008 11:06:00 -0700

From the: "it's all about the grant money" file

What is the latest euphemism for "kissing up"?

Ingratiating Behavior

Article about the study

-djr