jeffwass

92 ms·

931.
by jeffwass 12y ago
Or you upgrade to a bigger house, and roll the profits into a bigger down payment on the next property, keeping a similar sized mortgage. My friend did this, sold his old place and bought a bigger nicer house, keeping his monthly mortgage p
932.
by jeffwass 12y ago
No, this was about 7+ yrs ago. I should have it somewhere in storage though. IIRC it showed a disheveled older man, with a big beard and dressed like a stereotypical 'hobo', eating some food out of a tin can and making some snarky
933.
by jeffwass 12y ago
Or in the words of my friend - you open the door, and then go through it. You don't keep re-opening the door.
934.
by jeffwass 12y ago
When we redid the bathroom in my 100 year old Baltimore house, we found some pretty rad stuff. Old crumpled newspapers from the time of construction were shoved in the walls. These were interior walls, I think to assist with holding the pla
935.
by jeffwass 12y ago
I mention in a separate thread but the 'clumsy' proof in step 8 is done much more cleanly using the Levi Cevita form.
936.
by jeffwass 12y ago
FYI, this is standard fare for any undergraduate-level E&M class. The interesting part of deriving the wave equation from Maxwell's Laws, in my opinion, is how the permittivity and permeability of free space (epsilon_0 and mu_0) ca
937.
by jeffwass 12y ago
Not necessarily, as the distribution of startup returns is highly skewed and you don't know the correlation of his model prediction vs relative return. Ie, if his model consistently predicts success of those companies deep in the right
938.
by jeffwass 12y ago
But it's an intro book. No single text can cover the introduction for the range com people with no background to people designing cutting edge circuitry. At some point you need a BS or MS in EE of course, but at this point you're
939.
by jeffwass 12y ago
I disagree with the below and would recommend this book. See my other comment on this thread for more details. But basically I took Physics 123 at Harvard, and AoE sprang from the professor's lecture notes. When I took the class in the
940.
by jeffwass 12y ago
For the first, probably some textbook on SPICE simulation and/or upper-undergraduate EE texts, perhaps verging to RF engineering expertise. I used to need to worry about these things at My old job at MIT Lincoln Lab, but my boss said e
941.
by jeffwass 12y ago
Yes, that's basically the purpose of this book. Though amazingly experts will also learn many things and find it useful too. I took the Physics 123 class at Harvard, from which this book developed from the original course notes, and
942.
by jeffwass 12y ago
I've used cryogenic thermometers in my physics research, which IIRC were not thermocouples but basically calibrated chips of semiconductor, increasing their resistance at low temperatures. (Our usual temperature range went from 20 K do
943.
by jeffwass 12y ago
That's awesome, thanks for the description! Sadly I never got into assembly on the Z80, I guess I didn't realize it would be accessible :-( Cheers for reminding me of the Epson MX80 which I also had. I loved the programming manual
944.
by jeffwass 12y ago
Wouldn't you get most of that understanding anyway if you took French, Spanish, or another Romance language? Albeit with the added benefit of ability to communicate with a whole new sphere of people? Not dissing on Latin per se, but o
945.
by jeffwass 12y ago
I had the TRS-80 Model 1 with the expansion interface. I never remember seeing 32 column mode, my video was always 64 cols by 16 rows. Though I thought the way it handled graphics was pretty ingenious, where each character could be split in
946.
by jeffwass 12y ago
Hmm, does the cap screw on tight like a normal thermos? Maybe it's designed to always have a loose cap for venting. The dewars I was talking about above hold several hundred liters, are about 5-8 feet tall, and primarily for liquid he
947.
by jeffwass 12y ago
Awesome (well, awesome you called Ballmer direct back in the day, not so much the loss of college dreams...) My dad had one of those OSI machines. Just a few years ago he found it again in the basement and booted it up, and we were greeted
948.
by jeffwass 12y ago
Also remember - any dewar itself, improperly handled, can be a bomb! One professor I worked for hammered this concept into us when we started work in his lab. Yet my PhD adviser did not. Sometime after I graduated, one of my fellow grad st
949.
by jeffwass 12y ago
Yikes! But at least, as you mention, you can be sure it was clean. There's no knowing what nasties a used dewar might have been contaminated with (heavy metals, scary organics, etc).
950.
by jeffwass 12y ago
>>liquid nitrogen is ~700x denser than gaseous nitrogen. One of the coolest LN2 tricks we used to do at our physics demo days took advantage of this - making bubbles the 'fun way'. Take a big pot of boiling water and add so
951.
by jeffwass 12y ago
Cool stuff. I used to 'play' regularly with LN2 and LHe back in my grad student days (experimental condensed matter physics). I'm curious how much you paid for the 20 liter dewar. Here in London, just renting a dewar as a one
952.
by jeffwass 12y ago
Are we at the point yet where a 3D printer can replicate itself? Or at least print another functional 3D printer?
953.
by jeffwass 12y ago
I never had a FB account. I'm 39 and married. Exactly what am I missing out on? I use email and text message for most correspondence, and have LinkedIn mainly as a virtual Rolodex so I can get in touch with old friends and colleagues.
954.
by jeffwass 12y ago
Somehow I knew before clicking the link that it would be this book. I also read it several times, my father's copy in junior high, a copy I bought in high school, and another copy in early college. Though I'd probably recommend th
955.
by jeffwass 12y ago
That doesn't answer mrfusion's question about being in a stranded capsule for 100's of miles before the nearest exit or escape hatch. How long does it take that electric motor to drive the stranded capsule 100's of miles
956.
by jeffwass 12y ago
I haven't yet read the actual papers linked to be article, but I'm confused what the big breakthrough is here, the article is very light on specifics. The generalized uncertainty principle is nothing but an application of the &#x2
957.
Uber Seeks to Patent Pricing Surges That Critics Call Gouging(bloomberg.com)
5 points by jeffwass 12y ago|2 comments
958.
by jeffwass 12y ago
I've been to the Cuban interest section in Washington DC several times. It's not really an embassy in that diplomatic functions and freedoms don't exist like proper embassies. The ambassador's freedoms are quite limited.
959.
by jeffwass 12y ago
You are mistaken, the US embargo with Cuba does prevent Cuba from trading with other nations, as other nations are restricted in their USA trade if they do trade with Cuba. Iirc, any vessel that trades with Cuba is restricted from trading w
960.
by jeffwass 12y ago
Not true. I went to Cuba twice from the USA, legally as a student with an OFAC license. This was in 2002 and 2003. First time via Toronto (Baltimore -> Toronto -> Havana). Second time we took one of they very few available IIRC Ameri

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