Cooling with outside air is a bit trickier, since the temperature of the air changes much more quickly. We do this in the computer room of a radio telescope on a 3500m high mountaintop. The AC system has an "economizer" feature provided to cool with outside air, which has been modified to use proportional control to get a much more steady room temperature than the original bang-bang controller. That's needed to keep the analog signal levels from drifting too quickly and messing up the Dicke switching (go look that up). Not so important in a datacenter.
Your cruise control is not very good, then. The gain is set too high, so it's underdamped. Go read up on PID controllers. Good cruise controls tend to be overdamped to prevent speeding tickets.
A car with a cruise control will only accelerate (i.e., increase its speed, which is *not* the same as increasing engine RPMs) if it's currently moving slower than the setpoint. When it reaches the setpoint, it stops accelerating. That's the whole point of cruise control. If it accelerates from the setpoint, then it's broken by definition.
I would hope that a fellow with the technical competence of The Woz would know the difference between a properly behaving cruise control and one that's broken.
You'd think that Microsoft could manage to remove the XML extensions that the judge didn't like by now. Perhaps the regression testing for Windows 98 on a 286 slowed them down?
A DECsystem10 is a mainframe that does timesharing. I never saw the thing - it lived in the main school district office downtown.
We did have a PDP 11/34 in the school. It had a DZ11 card, but we never got it to timeshare BASIC while I was there. Then IBM changed the world two years later.
We had a 1200 baud modem in 1977 at the high school I attended in Tucson. It was a UDS201B, running over a leased 4-wire line. The terminal was a glass teletype made by a local company called TEC. It was blue and had the marvelous feature of CTRL-H to backspace.
The computer was a DECsystem10. It was difficult to keep up with the blinding speed of the text scrolling past on the screen!
It will keep working as long as it's used regularly. A typewriter will seize up if left alone a few years as the oil/grease dries out - especially the 45-year-old oil this machine has (according to the letter of authenticity the author wrote on it, it has never been serviced).
I wouldn't worry about that, as the end result of *not* cutting back on energy use is also the eventual destruction of the world economy. We live unsustainably. Oil isn't forever. Nukes aren't forever. Enjoy it while it lasts.
My first thought. But Google likes text ads, so they might not care so much if AdBlock were installed. Their advertisers, on the other hand, would be more than a bit unhappy.
Helium 3 is also used in cryogenic coolers that reach temperatures below 0.4K. These are used for cooling radiotelescope bolometers and other exotic scientific instruments.
I remember pricing it a few years ago for a bolometer we had that lost its He3, and being astounded at the price. Sounds like it was a bargain back then.
I was going to say that that looked like a PDP-11 running E&S hardware, but that was just speculation (or maybe the VT-05 and the E&S logo on the display screen gave it away). How delightful that you got to play with the actual code that was used in the movie!
Those of us without million-dollar graphics labs only got to do 2-D graphics at that time, or 3-D graphics using dots instead of vectors.
Patriot? Transcend? Super Talent? Those are not household names. Perhaps you have the all-too-common problem of shoddy workmanship by second-tier factories in Taiwan or China.
When you buy Intel or Seagate or Maxtor SSDs and they fail, then I'll take note.
It sounds like the solution might be to implement a custom version of TCP that takes the asymmetry of the physical radio channels into account. Since most mobile platforms have a much higher downlink packet count, a group ack method could provide relief to the unreliable uplink channel.
Disclaimer: I've only designed one wireless packet data link system in my life, and it was symmetrical.
If you take the time to RTFA, you will see that the problem with TCP management (as Mr. Turner describes it) is that you have to cause the system to drop packets occasionally when it's near but not quite at saturation, to let the TCP device at the other end know that the network is getting congested. If there are no dropped packets, TCP ups the packet rate until the network becomes clogged.
So in this case, zero packet loss is a setup for disaster instead of a desirable quality.
The trouble is that it's not an intuitive solution to a problem, the introduction of occasional packet loss. It's usually something to avoid.
The main reason they did this is to map out the field *interaction* between the RFID tag and the reader, which is not a trivial thing to visualize based on the two data sheets.
The article says "4-5 hours in full sunlight". That sounds like full sunlight to me, not indoor light (which has only a few percent of full sunlight's power).
Calculators run on microamperes, so they are not a valid comparison.
And yes, I have designed and built several solar-powered gizmos that work.
It would have to be in full sunlight in order for it to charge, so unless you have a private sun-lit balcony handy, would you sit in the sun 4-5 hours a day just to babysit your expensive solar-powered E-reader? You'd pay a lot more for sunscreen than AA batteries cost.
Old cars used drum brakes front and rear. They really suck compared to disc brakes. I leave a LOT of space in front of me when driving the old boat, for this reason.
...so this test was especially interesting for me. Remind me to keep to divided highways in the future.
One reason that the door crumpled so readily is the crazy wraparound windshield. The windshield pillar contains a free-hanging right angle, which is not the way that a structural engineer would have done it. It also bangs the knees.
The big problem with older cars is that the body shape was sculpted from clay in a studio separate from the rest of the car designers, rather than being designed as part of an automobile. The end result being that the body shape had no basis in sound mechanical design.
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Cooling with outside air is a bit trickier, since the temperature of the air changes much more quickly. We do this in the computer room of a radio telescope on a 3500m high mountaintop. The AC system has an "economizer" feature provided to cool with outside air, which has been modified to use proportional control to get a much more steady room temperature than the original bang-bang controller. That's needed to keep the analog signal levels from drifting too quickly and messing up the Dicke switching (go look that up). Not so important in a datacenter.
Your cruise control is not very good, then. The gain is set too high, so it's underdamped. Go read up on PID controllers. Good cruise controls tend to be overdamped to prevent speeding tickets.
A car with a cruise control will only accelerate (i.e., increase its speed, which is *not* the same as increasing engine RPMs) if it's currently moving slower than the setpoint. When it reaches the setpoint, it stops accelerating. That's the whole point of cruise control. If it accelerates from the setpoint, then it's broken by definition.
I would hope that a fellow with the technical competence of The Woz would know the difference between a properly behaving cruise control and one that's broken.
You'd think that Microsoft could manage to remove the XML extensions that the judge didn't like by now. Perhaps the regression testing for Windows 98 on a 286 slowed them down?
A DECsystem10 is a mainframe that does timesharing. I never saw the thing - it lived in the main school district office downtown.
We did have a PDP 11/34 in the school. It had a DZ11 card, but we never got it to timeshare BASIC while I was there. Then IBM changed the world two years later.
Yes, the lack of a backspace key sucked. And the lack of a TAB key etc. The thing had about as many keys as a mechanical typewriter.
The computer was a DECsystem10. It was difficult to keep up with the blinding speed of the text scrolling past on the screen!
It will keep working as long as it's used regularly. A typewriter will seize up if left alone a few years as the oil/grease dries out - especially the 45-year-old oil this machine has (according to the letter of authenticity the author wrote on it, it has never been serviced).
I don't know how anyone can stand to browse the web without it.
Man, that looks like fun!
I wouldn't worry about that, as the end result of *not* cutting back on energy use is also the eventual destruction of the world economy. We live unsustainably. Oil isn't forever. Nukes aren't forever. Enjoy it while it lasts.
My first thought. But Google likes text ads, so they might not care so much if AdBlock were installed. Their advertisers, on the other hand, would be more than a bit unhappy.
Helium 3 is also used in cryogenic coolers that reach temperatures below 0.4K. These are used for cooling radiotelescope bolometers and other exotic scientific instruments. I remember pricing it a few years ago for a bolometer we had that lost its He3, and being astounded at the price. Sounds like it was a bargain back then.
Those of us without million-dollar graphics labs only got to do 2-D graphics at that time, or 3-D graphics using dots instead of vectors.
They don't serve any purpose to benefit the users, so why run them?
When you buy Intel or Seagate or Maxtor SSDs and they fail, then I'll take note.
Disclaimer: I've only designed one wireless packet data link system in my life, and it was symmetrical.
So in this case, zero packet loss is a setup for disaster instead of a desirable quality.
The trouble is that it's not an intuitive solution to a problem, the introduction of occasional packet loss. It's usually something to avoid.
The main reason they did this is to map out the field *interaction* between the RFID tag and the reader, which is not a trivial thing to visualize based on the two data sheets.
Calculators run on microamperes, so they are not a valid comparison.
And yes, I have designed and built several solar-powered gizmos that work.
It would have to be in full sunlight in order for it to charge, so unless you have a private sun-lit balcony handy, would you sit in the sun 4-5 hours a day just to babysit your expensive solar-powered E-reader? You'd pay a lot more for sunscreen than AA batteries cost.
And how would they do that? The TV uses a format that was stillborn. No video source exists.
Old cars used drum brakes front and rear. They really suck compared to disc brakes. I leave a LOT of space in front of me when driving the old boat, for this reason.
They shoulda used a 1958 model, considered to be the only non-classic late fifties Chevy.
Which is why I have one.
One reason that the door crumpled so readily is the crazy wraparound windshield. The windshield pillar contains a free-hanging right angle, which is not the way that a structural engineer would have done it. It also bangs the knees.
The big problem with older cars is that the body shape was sculpted from clay in a studio separate from the rest of the car designers, rather than being designed as part of an automobile. The end result being that the body shape had no basis in sound mechanical design.