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Comment: Quantum mechanics is real, like it or not. (Score 4, Insightful) 85

by Animats (#47568933) Attached to: More Quantum Strangeness: Particles Separated From Their Properties

That's a nice result. It's in accord with theory. It doesn't match human intuition based on large-scale objects, but it's the way the universe really works. The theory in this area is well understood; Feynman's "QED" has a good overview.

Ever since the double-slit experiment, it's been clear that this stuff is real. Over the last few decades, more of the weirder predictions of quantum electrodynamic theory have been confirmed experimentally. This is another predicted event confirmed. Nice work.

Comment: Re:$1000, not $300 (Score 2) 43

by Animats (#47568555) Attached to: A Look At the Firepick Delta Circuit Board Assembler (Video)

I guess you're supposed to stencil the paste in first and the put it in a heat oven as if you had done the pick and placing by hand.

Their FAQ contains:

  • TBD - Solder paste dispensing
  • TBD - Selective Reflow via custom ATC head

That's what would make the machine useful for prototyping. Printing a solder paste stencil can be done on a laser cutter, but you need access to one, or you must send the job out. Laying down solder paste by hand with a little syringe on each pad (probably under a microscope) takes longer than manually placing parts and is Not Fun.

Printing solder paste with an ink-jet printer type head has been done. If they can make that work, that will be a big win.

Comment: $1000, not $300 (Score 1) 43

by Animats (#47563223) Attached to: A Look At the Firepick Delta Circuit Board Assembler (Video)

Their presentation for investors quotes a sale price of $1000, not $300. At that price they might be able to do it. How well they'll do it remains to be seen.

Their presentation is all about their XY positioning mechanism. But that's not the problem. The hard problem is dispensing solder paste reliably and precisely, sticking the component down, and using hot air to solder it into place. As with low-end 3D printers, most of the problems are where the weld/soldering action takes place. They don't say much about how that's done.

The important thing is doing a consistently good soldering job. Nobody needs a machine that produces lots of reject boards.

Comment: Should I do an ad blocker? (Score 3, Interesting) 326

by Animats (#47561759) Attached to: Which Is Better, Adblock Or Adblock Plus?

I'm behind Ad Limiter, which limits Google search ads to one per page, picking the best one based on SiteTruth ratings. You can set it for zero search ads if you like. It also puts SiteTruth ratings on Google search results. It's a demo for SiteTruth search spam filtering.

This Mozilla/Chrome add on has a general ad-blocking mechanism inside. Unlike most ad blockers, it's not based on regular expressions looking for specific HTML. It finds URLs known to lead to ads, works outward through the DOM to find the ad boundary, then deletes the ad. So it's relatively insensitive to changes in ad code, and doesn't require much maintenance. The same code processes search results from Google, Bing, Yahoo, Bleeko, DuckDuckGo, and Infoseek. (Coming soon, Yandex support, and better handling of Google ads within ads, where an ad has multiple links.)

So, if I wanted to do a better ad blocker, I could do so easily. Should I? Is another one really needed? Are the headaches of running one worth it?

Comment: Cell and battery production in same plant (Score 5, Informative) 91

by Animats (#47559917) Attached to: Tesla and Panasonic Have Reached an Agreement On the Gigafactory

The Tesla/Panasonic plan gets cell and battery production back into the same plant. The battery industry has, for a while, had a model where cells were made in one country (usually Japan, Taiwan or S. Korea, or at least with machinery from there) and assembled into device-specific battery packs near where the end device was produced (usually China or the US.) For the Chevy Volt, the cells come frm LG Chem in Korea, and the battery packs are assembled at the Brownstown, MI Battery Assembly plant.

There's no good reason to do it that way now that the era of cheap labor in China is over. As a rule of thumb, labor has to be 4x cheaper to justify offshoring. The coastal provinces in China have reached that level with respect to US/Japan wages.

Done right, this isn't labor-intensive. Brownstown has only 100 workers in a 400,000 square foot plant, and they're doing battery assembly, which is the more labor-intensive part of the operation. Tesla claims to need 6,500 employees for their 10 million square foot plant, but they're probably counting construction-phase employees.

Comment: "Beginning of mainstream 3D printing" (Score 4, Informative) 61

by Animats (#47559309) Attached to: 3-D Printing Comes To Amazon

But this could be the beginning of mainstream 3D printing.

We heard that when Staples did it.

Amazon's 3D printed product offerings are rather lame. They're not offering any of the more advanced 3D printing processes; for that you have to go to Shapeways. All you can get from Amazon is plastic junk.

Comment: No new tools. Low-budget operation (Score 3, Informative) 61

All they're offering are some existing tools, ones you can get for free. The main ones are the Clang static analyzer and Cppcheck. They're not offering free access to some of the better, and expensive, commercial tools.

Cppcheck is basically a list of common errors, expressed as rules with regular expressions. Clang is a little more advanced, but it's still looking for a short list of local bugs. Neither will detect all, or even most, buffer overflows. They'll detect the use of "strcpy", but not a wrong size to "strncpy".

Comment: The scammer's dream. (Score 3, Insightful) 165

by Animats (#47551715) Attached to: US States Edge Toward Cryptocoin Regulation

Over half the Bitcoin exchanges have gone bust. Entire Bitcoin "stock exchanges" disappeared with the money. Bitcoin "investments" promising substantial returns each month were, of course, Ponzi schemes.

Bitcoin is a scam magnet. Irrevocable, remote, anonymous money transfers are the scammer's dream. (Yes, there are people talking about cryptographic escrow schemes so you can buy something with Bitcoins and have some recourse if it doesn't show up. So far, that hasn't reached usability.)

That's why Bitcoin needs regulation. If you're going to hold other people's money, you have to be regulated. Deal with it.

Comment: Re:How has slashdot come to this? (Score 1) 143

Utter crap. Codenomicon are very friendly to FLOSS and FLOSS developers. They're also great guys. They have been providing free test services to the Samba project for many years now, and have helped us fix many many bugs.

In case you hadn't noticed, the code they're reporting on here is closed source proprietary code...

Comment: Each server is worth $189 or less. (Score 1) 206

by Animats (#47544815) Attached to: Ask Slashdot: What Would You Do With Half a Rack of Server Space?

If you want more servers like that, Wierd Stuff Warehouse in Sunnyvale, CA, has the same HP series G Xeon servers for $189. (2 3GHz quad-core Xeons per server! Hard drives are extra, but cheap.) Wierd Stuff has huge supplies of previous-generation data center equipment.

It's amazing how cheap computer hardware is now.

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