Tuesday, March 5, 2013

Lyman Filament Extruder II...

Inventors rule!

Most low-cost 3D printers use ABS plastic filament as the raw material from which they produce objects.  This raw material costs ten times what ABS costs in its more common form: pellets.  So Inventables sponsored a contest, with a $40,000 prize, for a low-cost machine that would turn ABS pellets into ABS filament.  Hugh Lyman won the contest with his Lyman Filament Extruder II, at right.

Awesome!

Yet Another Reason to Leave Southern California...

We're living in a fourth amendment exclusion zone...

RAW Image File Processing – in JavaScript

Nothing special about this package that I can see except for the fact that it's running in your browser.  Despite the fact that I've been working with web apps for over 10 years now, I'm still blown away that they can do compute-intensive things like image processing and cryptography, in an interpreted language like JavaScript...

Flat UI Toolkit...

Yup, yet another web UI toolkit.  This one is for the trendy new “flat UI” – which looks just like the very first UIs I ever saw on a color screen, way back in the early '80s.  Everything old is new again...

Monday, March 4, 2013

Oh, Please! Pretty Please with Sugar On It!!!

Oh, please let this work!

Superconducting Gets Better...

Mainly in the sense of larger current capacity through engineered materials (versus homogenous superconducting material).  Engineered materials of all kinds have been revolutionizing all sorts of things in the past 50 years or so, from lumber (plywood, engineered composite beams) to electronics (integrated circuits, printed circuit boards)...

Which Hurts More?

Giving birth or getting kicked in the balls?  The age-old question has been settled:
Women always say that giving birth is much more painful than a guy getting kicked in the cojones.

They are wrong, and here's the proof.

A year or so after giving birth, a woman will often say, "It might be nice to have another child."

You never, ever hear a guy say, "You know, I think I would like another kick in the cojones."

Fly Like a Bird...

Well, more like a brick with fins.  Reader Simi L. passed this along, saying “This certainly fits into my definition of insanity!  Question: I wonder why they wear helmets?  I guess they are to hold their video cameras...”

Simi says insane.  I say: that looks like fun!  Debbie says: No!

Sunday, March 3, 2013

DTrace...

A nice resource for using DTrace on Macs, BSD, or Solaris.  DTrace can be used for many things, but I know it mainly for performance troubleshooting...

Palate Cleanser for This Morning...

This story is wonderful from the perspective of both participants...

Solving a Rubik's Cube the Hard Way...

While juggling:

Saturday, March 2, 2013

Meet Slightly Loony, Nickname “Sly”...

Not me (also known as “Slightly Loony”, or “Utterly Loony” to my lovely bride); this time we're talking about our new offroading chariot: our brand-spanking-new 2013 Toyota FJ Cruiser.  I took this picture today, before the first of many modifications we're planning to make.  Miki (our youngest field spaniel) believes he owns this new vehicle, which he has approved of after his first ride in it.  He and Race (our border collie) will be going with us on our first big adventure in this thing, in July – we'll be heading out to see the wildflowers in the San Juan Mountains of southeastern Colorado.

I'll post here from time to time describing the modifications I'm making to Sly.

The first modification will be a very simple one: I'm going to find a place to mount our PLB (personal locator beacon), shown at left.  If you're not familiar with these devices, you can read all about them at the preceding link.  Basically they allow you to broadcast a distress signal from anywhere on the planet.  This signal is relayed to the appropriate search and rescue organizations, and they will (we sincerely hope!) respond.  We offroad in places where cell phones don't work.  That leaves us with just a few alternatives: ham radio, satellite phone, and PLB.  The PLBs have several advantages, including:
  • (relatively) low cost, one time (no subscription like satellite phones)
  • reliability and testability (you can be sure the device works)
  • truly global coverage, 24 x 7 (ham radio is shaky on this front)
  • small, portable devices (this one is 6" x 2.5" x 1.5", and weighs a few ounces)
  • direct relay of distress calls to responders (with ham radio and satellite phones, you have to call someone and have them relay your issue to the search and rescue folks - which they have to locate
  • direct relay of your location to the search and rescue responders (the device has a GPS to locate you, and it broadcasts your position to the satellite)
We found these advantages compelling, and decided to go the PLB route.  After some research on the web, I chose the PLB-350C  “SARLink”, made by ACR Electronics.  We received it a couple of days ago.  It took an hour or so to register the device with the NOAA (the government agency that routes distress calls), and ran an end-to-end test on it, which passed with flying colors.  The device has a “self-test” button that runs a diagnostic and then sends a test message to the satellite.  This test message is recorded on a web site (so I can verify the results), and optionally it can be configured to send an SMS or email message to let me know the test passed.

Something to know if you're considering a PLB: these devices are for use in extremis – not for running out of gas, or even for a run-of-the-mill mechanical breakdown.  You use a PLB only when you believe you are in mortal danger.  This could happen because of (say) a transmission problem that leaves you stranded at high altitude, and you don't have survival gear to make it through an Arctic-like night.  It could also happen because you're injured, and can't walk out of the back-country.  But if you use the PLB to summon a cup of coffee, some fuel, or because you're lonely – be aware that the search and rescue organizations would be most seriously displeased with you, and are quite likely to send you a bill with 5 or 6 significant digits in the dollar value!

On past trips, including to the San Juan Mountains, I've been extremely careful to not do anything at all risky when on a road or trail not often traveled.  The older we've gotten, the more I apply this policy – as we're less able, with age, to extricate ourselves from some hairy situation.  The PLB addresses one aspect of this: if we ever get into serious trouble, this device could save our bacon.  Other modifications we're planning will address other aspects: making Sly more rugged and resistant to the hazards of the back-country, and improving our ability to get ourselves unstuck (always a hazard on the rough sorts of “roads” we like to go on).  All of these things put together will increase our confidence that we can safely venture to the wild, remote places that we love to go to...

Fast Solution for Graph Laplacians...

I first ran across graph Laplacians way back in the '70s when I was trying (and failing!) to build an electronics simulator.  This was long before SPICE was available on microprocessors.  The algorithms I read about back then for solving graph Laplacians were far more complicated than this new algorithm...

Inefficient Rulers...

Golomb Rulers and Costas Arrays – two notions completely new to me, but fun (in a geekly, mathematical sort of way)...

Big Meteorite Found in Antarctica...

The biggest one in over 25 years.  Scientists have been scouring Antarctica for meteorites for years, taking advantage of the easy spotting (black meteorite on white snow) and pristine condition.  Most of Antarctica is not only uninhabited, it's also unvisited – the most remote areas of Earth are there...

Friday, March 1, 2013

Even I Can Understand This...

If you know me, then you know that I am not at all interested in sports.  Any sport.  I know so little about sports that I can't even identify most sports when I see them being played.

But I understand this:


On rare occasions these days, I feel some hope for the survival of the human species.  Watching this brought that hope back, at least for a few minutes until I watched a video of Obama declaring that he wasn't a dictator.  I should make a page with a bunch of these on it, to help me regain my spirits on such occasions...

Map of National (and Some States/Provinces) Wealth...

Wealth of a country (or other geopolitical entity) is a notoriously slippery datum to measure.  It isn't enough to convert per capita income to a common currency and compare them, because the cost of living varies tremendously from place to place.  Furthermore, in some political systems (I'm looking at you, Mother Russia, Mexico, China, Nigeria, India, et al), pervasive corruption means that significant fractions of their economies are underground and therefore not even in the official per capita income data.  What's a poor statistician to do?

One possibility is to find a proxy for that which you're trying to measure.  Ideally the proxy would be perfectly proportional to the value you actually want to measure, and could be measured without perturbing the value you're trying to measure.  In the case of the wealth of countries, some scientists have proposed the prevalence of outdoor artificial lighting at night as a proxy.  Their thinking is that the wealthier any country is, the more outdoor artificial lighting they'll use.  And very conveniently, outdoor lighting levels can be easily measured by existing satellites, hundreds of which image the surface of the earth every day.

The map below is the result of an attempt to make exactly this measurement.  As I cast my eye over the map, relatively few of the results look unexpected to me.  For instance, I wouldn't have guessed Greenland was so prosperous, nor Paraguay so poor.


Visualization: Migration Between Countries...

Peoplemovin is a well-done interactive visualization that lets you see migration to or from any given country.  For instance, in the clip below I've clicked on the Phillipines on the right, to see where people migrate to the Philippines from. 

There were lots of surprises for me as I browsed around this visualization.  In the example case, I never would have guessed that the top three sources for immigrants to the Philippines were the U.S., China, and the U.K.  I spent about nine months (in several stretches) in the Philippines when I was in the U.S. Navy, way back in the '70s, and I did run into quite a few U.S. military retirees.  I wonder if that's where most of these immigrants come from?


Publicly-Avaliable Data Sources...

A nice, partially organized collection of free datasets, publicly available on the Internet (either via download or API).  The sources include private companies, educational organizations, non-governmental organizations, and governments.  There's a lot of interesting stuff in here on a wide variety of subjects...

Zopfli Compression...

A new open source, Apache licensed general purpose Deflate-compatible compression algorithm.  This one consumes more CPU time to get a little better compression; it's aimed mostly at web sites delivering a large amount of static content.