Satellites don't inherently have to be that expensive, the only reason they are is that you can't afford to launch another one when the one you have fails. Because launches are so expensive it makes sense to sink money into making the sat as reliable and long living as possible. If launches were free you could whip up a functional comms sat for thousands or tens of thousand and if one fails just lob another one. The cost of payload depends on launch cost, with half the launch cost you can make the sat half as reliable, for half the cost and just lob two of them.
Satellites and their launches are expensive because they are expensive.
Try to put out the fire with fluorine gas. That's when the escapades really begin!
Nothing prefers fluorine over oxygen, aside from the alkaline earths (column II).
Then again, if you're spraying fluorine gas on a fire, then you should not be allowed in a lab. That would kill the whole town, just from the fluorine release alone.
...The thing was so big and fat, it ceased to be a pocketbook. I think the last one I used had a version in the 70s.
Completely useless and error-ridden.
A Professor colleague wrote to the Editor of CRC several times, with a very specific list of over 60 errors he had found in the current version (at the time).
No response. The corrections were never made.
They just reprint the exact same (error-filled) tables, and stamp a new year on it to keep the money rolling.
But carrying cheese in your carry on luggage will get the TSA guys at the airport check points really excited that they found some C4 until they open the bag and discover it's just cheese. Having a stress test where the medical technician injects radioactive material into your bloodstream a few weeks before flying causes lots of excitement too.
If a checkpoint is really swamped, they can just wave people through and bypass the entire scanner/pat down routine.
I put a piece of cheesecake on my laptop, and it went through the scanner. They freaked.
I opted out in a Monday flight from LAX. Short lines. It took 10 minutes of waiting before someone showed up. (During that time, I got several people in the line behind me to opt out, too.) Then the pat-down and so forth took another 15 minutes.
That's 25 minutes, at a time with no lines up to the search, and more TSA around than travelers!
I can think of no other reason for this than 'punishment' for opting out.
LAX supposedly replaced all the X-ray with THz machines, but I did not recognize the scanner maker & model, so played it safe.
I spent three years taking college level statistics and floundered around with it. Then I came to a simple realization that made everything a lot easier - statistics is not math. It uses math but it's not math any more than physics is math. It is a method of modeling the world for analysis. I wish my instructors had explained that rather than saying we all knew some statistics because we knew how to calculate an average (mean).
Bravo! You nailed it.
Statistics is applied math, just like engineering is applied physics, chemistry, and math.
Well, at least someone with a loud voice has finally said it.
Journalists need(ed) to fill column-space, and have to get readers' attention. But although it is difficult to get a high-end concept through to them — they won't come back with a galley proof for you to check — the more common result is the journalist "spicing up" the words, without really understanding that they are changing the meaning.
That and flying cars. Everyone wants to believe in flying cars.
...overwhelmingly, most rapes are committed by men, be it upon women or other men (who keep it even quieter than female rape victims).
Thus, males who express the sentiment that this extremely offensive person be placed in the general population, are actually acknowledging that rape is a bad, bad (emotionally destructive) thing, and also, implicitly, stating that such a horrible fate is 'too good' for him, and that something (unimaginably) worse happen to this jerk – who totally deserves any and all physical/psychological/psychic pain that can possibly be inflicted upon a person.
My point is: Men do not think like women, and are mostly incapable of viewing the world through a woman's eyes. When men DO take a step in the right direction, it should not be dunned.
Right. Iron pipes moving water with chlorine are just fine. . . as long as the pH is above 7 (not acidic), which is usually the case if water is sourced from an underground aquifer (limestone cave-to-be).
It's braze, not solder, but the difference is only in the melting temperature of one metal alloy used to join or seal a different metal.
A bigger source is in the older US cities. The big water-feeds were made of brick, then lined with lead. Chlorine, or a bit of sodium hypochlorite (bleach), had been used for decades, and the lead had long-ago grown a protective scale, so no lead got into the water.
Well, around 2002, Washington DC changed to chloramine. That stuff dissolved the protective scale, and led to all the kiddies in Washington DC having high levels of lead in their blood. OOPS!
I agree that Hydrogen sounds like a better approach.
1) orders of magnitudes cheaper 2) even less dense 3) much larger molecules, so leakage should be far less
Not inert, true, but that should be possible to deal with.
Nice thought on #2, but incorrect. Hydrogen diffuses through steel quite quickly.
Hydrogen is the bane of ultra-high vacuum (UHV) systems, which have stainless steel walls 1/2 to 1 inch in thickness. New system? Hydrogen comes out of the steel itself, as it contains some. But with time, that might be depleted, but no —more comes in from the atmosphere, or from any replaced components or new seals.
For UHV systems, helium is quite useful for finding leaks. Microscopic or even nanoscopic pathways for the helium atoms to make their way in. One frequently has poor base vacuum, and must hunt around blowing helium on suspected parts. These could be anything: micro-crack in a weld, stress-crack in a feed-through, an improperly bolted seal, a loose bolt. It can get very fiddly.
If you're an asshole, people know it and will remember it. So you make SURE you don't act like an asshole. Cities? You'll likely never see that person again, so who gives a shit?
Small-town assholes are the worst of the lot.
And in any case, there are thousands of other small towns where these assholes can move, starting afresh as an assumedly wholesome, small-town type of folk. After all, "Nothing ever happens here"
FTSummary:Russia could move to wipe out the humiliation it suffered at the hands of NASA when it lost the 1960s race to the moon with the landing of Apollo 11 on July 20, 1969.
Uhm, "lost" the space race?
Sputnik? Remember?
Oh, and Russia also landed a craft on, and beamed back images from, the surface of Venus. They were first. In fact, and I expect to be corrected, I don't recall the US ever landing a probe on Venus that did anything other than send back a few blips of telemetry readings before dissolving in the Venusian atmosphere.
BTW, I have refused, starting two years ago, to teach undergraduate or even graduate-level classes at my top-10 University as a Lecturer.
The kids deserve to get what they pay for, of course. But I will die of starvation before making the Regents rich just because I have societal principles. I have other principles, too. Y'know, like not being a wage-slave, despite being qualified above my peers (of ~same age) who are tenured, and just dump teaching duties onto their TAs.
America is getting what America is asking for. And anyway; I find Community College students far more receptive to, and eager-to-learn, when they get a skilled educator than the "top-uni" kids — those twits only care whether they're getting an A vs. an A–, and little about the content.
It's done for the hiring of potential PhD Professors, too.
Universities, unable to make discerning decisions on who is the best candidate for a tenure-track position (hint: laziness), just go for the cheapest of the lot of those that seem "kind of good enough."
As support, I offer that Community Colleges (good things) pay about 2x–3x the rate for Lecturing as local Universities do. They pay you as a contractor, as do Unis, but with the understanding that this means that you have to procure your own health care, and so on. The Community Colleges also provide, typically here, 1.5 hours of prep/grading time per "hour of contact" time. That's a 2.5x pay multiplier!
Back at the major University, you get no allowance for prep time, and only a "straight %-of-time salary" for the course. If you are a Lecturer, and you are trying to improve the reputation of your University, then please, please, please, take a close look at the numbers! Your employer not care. They only want the class taught for cheap!
In fact, you will probably find, as I did, that your TA gets a larger monthly stipend than your salary, on top of his/her tuition. Well, so after you come to that realization, if you have the sense avoid picking up more Lecturing gigs at the Uni, you will also learn that your State's Unemployment Insurance pays better than your teaching gig did!
That's right folks, the State, in its Wisdom, will pay you (we) 'over-educated PhDs' more money to lie on the couch at home than to actually do what would benefit the State – educating our youth (which is probably what you had wished to do to earn a living, way back when you chose the PhD path)!
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Satellites don't inherently have to be that expensive, the only reason they are is that you can't afford to launch another one when the one you have fails. Because launches are so expensive it makes sense to sink money into making the sat as reliable and long living as possible. If launches were free you could whip up a functional comms sat for thousands or tens of thousand and if one fails just lob another one. The cost of payload depends on launch cost, with half the launch cost you can make the sat half as reliable, for half the cost and just lob two of them.
Satellites and their launches are expensive because they are expensive.
That would make it even lighter. And I don't know why they call it a metal, it is a composite, a meta-material surely?
It's a metal-matrix composite, which have been around for decades.
Try to put out the fire with fluorine gas. That's when the escapades really begin!
Nothing prefers fluorine over oxygen, aside from the alkaline earths (column II).
Then again, if you're spraying fluorine gas on a fire, then you should not be allowed in a lab. That would kill the whole town, just from the fluorine release alone.
Because, from wikipedia: "Magnesium is flammable, ..."
Magnesium is also inflammable.
Why the hate against magnesium?
Um, why do you think so many Ferraris have engine-fire problems?
I believe it is the magnesium used for the engine block.
Well, that, among other things...
Magnesium.
Light? Yes.
Strong? Yes.
Burn-ey? Yes.
Hint: Don't use water to put out the fire.
...The thing was so big and fat, it ceased to be a pocketbook. I think the last one I used had a version in the 70s.
Completely useless and error-ridden.
A Professor colleague wrote to the Editor of CRC several times, with a very specific list of over 60 errors he had found in the current version (at the time).
No response. The corrections were never made.
They just reprint the exact same (error-filled) tables, and stamp a new year on it to keep the money rolling.
But carrying cheese in your carry on luggage will get the TSA guys at the airport check points really excited that they found some C4 until they open the bag and discover it's just cheese. Having a stress test where the medical technician injects radioactive material into your bloodstream a few weeks before flying causes lots of excitement too.
If a checkpoint is really swamped, they can just wave people through and bypass the entire scanner/pat down routine.
I put a piece of cheesecake on my laptop, and it went through the scanner. They freaked.
I opted out in a Monday flight from LAX. Short lines. It took 10 minutes of waiting before someone showed up. (During that time, I got several people in the line behind me to opt out, too.) Then the pat-down and so forth took another 15 minutes.
That's 25 minutes, at a time with no lines up to the search, and more TSA around than travelers!
I can think of no other reason for this than 'punishment' for opting out.
LAX supposedly replaced all the X-ray with THz machines, but I did not recognize the scanner maker & model, so played it safe.
I spent three years taking college level statistics and floundered around with it. Then I came to a simple realization that made everything a lot easier - statistics is not math. It uses math but it's not math any more than physics is math. It is a method of modeling the world for analysis. I wish my instructors had explained that rather than saying we all knew some statistics because we knew how to calculate an average (mean).
Bravo! You nailed it.
Statistics is applied math, just like engineering is applied physics, chemistry, and math.
Well, at least someone with a loud voice has finally said it.
Journalists need(ed) to fill column-space, and have to get readers' attention. But although it is difficult to get a high-end concept through to them — they won't come back with a galley proof for you to check — the more common result is the journalist "spicing up" the words, without really understanding that they are changing the meaning.
That and flying cars. Everyone wants to believe in flying cars.
I agree with your sentiments completely. But...
Thus, males who express the sentiment that this extremely offensive person be placed in the general population, are actually acknowledging that rape is a bad, bad (emotionally destructive) thing, and also, implicitly, stating that such a horrible fate is 'too good' for him, and that something (unimaginably) worse happen to this jerk – who totally deserves any and all physical/psychological/psychic pain that can possibly be inflicted upon a person.
My point is: Men do not think like women, and are mostly incapable of viewing the world through a woman's eyes. When men DO take a step in the right direction, it should not be dunned.
Well, how else do you think Boeing can possibly compete with the giant Lock-Mart (Lockheed-Martin)?
I've posted a clone of this data-cache on my BBS. Just make sure you have at least a 54.6 baud modem, so ensure a speedy download.*
Long-distance telephone charges may apply.
Right. Iron pipes moving water with chlorine are just fine. . . as long as the pH is above 7 (not acidic), which is usually the case if water is sourced from an underground aquifer (limestone cave-to-be).
It's braze, not solder, but the difference is only in the melting temperature of one metal alloy used to join or seal a different metal.
A bigger source is in the older US cities. The big water-feeds were made of brick, then lined with lead. Chlorine, or a bit of sodium hypochlorite (bleach), had been used for decades, and the lead had long-ago grown a protective scale, so no lead got into the water.
Well, around 2002, Washington DC changed to chloramine. That stuff dissolved the protective scale, and led to all the kiddies in Washington DC having high levels of lead in their blood. OOPS!
Note that Washington DC is listed as #6 in "perceived political corruption" among US States.
DC is not a State.
I agree that Hydrogen sounds like a better approach.
1) orders of magnitudes cheaper
2) even less dense
3) much larger molecules, so leakage should be far less
Not inert, true, but that should be possible to deal with.
Nice thought on #2, but incorrect. Hydrogen diffuses through steel quite quickly.
Hydrogen is the bane of ultra-high vacuum (UHV) systems, which have stainless steel walls 1/2 to 1 inch in thickness. New system? Hydrogen comes out of the steel itself, as it contains some. But with time, that might be depleted, but no —more comes in from the atmosphere, or from any replaced components or new seals.
For UHV systems, helium is quite useful for finding leaks. Microscopic or even nanoscopic pathways for the helium atoms to make their way in. One frequently has poor base vacuum, and must hunt around blowing helium on suspected parts. These could be anything: micro-crack in a weld, stress-crack in a feed-through, an improperly bolted seal, a loose bolt. It can get very fiddly.
To be fair, most any padlock can be defeated in 1 second with a bolt cutter.
And the result is instant evidence that the lock was tampered with.
And by whom, if you're caught with said bolt cutters. Forensic analysis and all (imaging scrape pattern).
Of course, piston-engine propeller planes still use LEADED fuel.
Options exist, but pilots don't seem to care.
"when it lost the 1960's race to the moon"
Reading comprehension isn't your strong suit, is it?
I did read it, but it was between the lines...
The article's writer was cherry-picking from history for editorial slant.
If you're an asshole, people know it and will remember it. So you make SURE you don't act like an asshole. Cities? You'll likely never see that person again, so who gives a shit?
Small-town assholes are the worst of the lot.
And in any case, there are thousands of other small towns where these assholes can move, starting afresh as an assumedly wholesome, small-town type of folk. After all, "Nothing ever happens here"
Nestle is pushing for a KitKat bar emoji?
Wouldn't that automagically make the mark 'generic', thereby voiding their dearly protected status?
.
Non-sequitur: Didn't the ancient Egyptians invent emojis?
FTSummary: Russia could move to wipe out the humiliation it suffered at the hands of NASA when it lost the 1960s race to the moon with the landing of Apollo 11 on July 20, 1969.
Uhm, "lost" the space race?
Sputnik? Remember?
Oh, and Russia also landed a craft on, and beamed back images from, the surface of Venus. They were first. In fact, and I expect to be corrected, I don't recall the US ever landing a probe on Venus that did anything other than send back a few blips of telemetry readings before dissolving in the Venusian atmosphere.
BTW, I have refused, starting two years ago, to teach undergraduate or even graduate-level classes at my top-10 University as a Lecturer.
The kids deserve to get what they pay for, of course. But I will die of starvation before making the Regents rich just because I have societal principles. I have other principles, too. Y'know, like not being a wage-slave, despite being qualified above my peers (of ~same age) who are tenured, and just dump teaching duties onto their TAs.
America is getting what America is asking for. And anyway; I find Community College students far more receptive to, and eager-to-learn, when they get a skilled educator than the "top-uni" kids — those twits only care whether they're getting an A vs. an A–, and little about the content.
It's done for the hiring of potential PhD Professors, too.
Universities, unable to make discerning decisions on who is the best candidate for a tenure-track position (hint: laziness), just go for the cheapest of the lot of those that seem "kind of good enough."
As support, I offer that Community Colleges (good things) pay about 2x–3x the rate for Lecturing as local Universities do. They pay you as a contractor, as do Unis, but with the understanding that this means that you have to procure your own health care, and so on. The Community Colleges also provide, typically here, 1.5 hours of prep/grading time per "hour of contact" time. That's a 2.5x pay multiplier!
Back at the major University, you get no allowance for prep time, and only a "straight %-of-time salary" for the course. If you are a Lecturer, and you are trying to improve the reputation of your University, then please, please, please, take a close look at the numbers! Your employer not care. They only want the class taught for cheap!
In fact, you will probably find, as I did, that your TA gets a larger monthly stipend than your salary, on top of his/her tuition. Well, so after you come to that realization, if you have the sense avoid picking up more Lecturing gigs at the Uni, you will also learn that your State's Unemployment Insurance pays better than your teaching gig did!
That's right folks, the State, in its Wisdom, will pay you (we) 'over-educated PhDs' more money to lie on the couch at home than to actually do what would benefit the State – educating our youth (which is probably what you had wished to do to earn a living, way back when you chose the PhD path)!