The orbit diagrams specifically say they're using 2-body physics and NOT to use them for close-approach calculation or multiple years in the future. So trust the Torino list for closest approach etc.
No matter how carefully, it still breaks a lot of libraries which had been using that word as a typedef with that or similar spellings. It's not a tiny chance, it's guaranteed... unless you've already upgraded your compiller and all libraries to full ANSI/ISO C99 compatibility, which some vendors only started shipping recently, and aren't adding any 3rd party libraries in the next 5 years. (I'm hoping to finish the C++98 conversion soon. People keep discovering legacy code!)
Sigils/prefixes is a religious issue. Mentioning them with line numbers in the same graf suggests someone hasn't fully recovered from initial exposure to BASIC back before we had lower case. Dijskstra overstated the perniciousness of Basic, but... branching out into other languages _early_ combined with _early_ theory exposure seems to be the best predictor for a full, healthy recovery.
The perl programmers I know... I've never met a perl programmer who could tell me what a design pattern is either.
Maybe you need to get out more? The intersection of Perl-fanatics and readers of Alexander (not just GOF, but the original, architecture of bricks and mortar) is not a null set. I'll be happy to be met next time you're in Boston. You're buying the beer.
[SOJ] Why would Perl programmers need to learn a new language, when Perl is a living language that will always be new? [EOJ]:-)
Hmm. Why am I answering a troll from someone named "butane bob"?
Writing a Perl parser without YACC should be reasonable with Perl 6.;-)
In addition to the Apocalypses and Exegeses, Damian and Allison have produced two
Synopses, which are shorter and quicker to market.
The names are a running gag on church-latin, that interconnects Larry's linguisticism, Damian's eclecticism, and the monastic themery of the Perl Monks' alternate retroynm for.PM. Larry's Apocalypses are not apocalyptic in the common figurative sense (although the neo-Luddites who think the only improvement on Perl5 is PHP or Python may think so), but are the Revelations of the gur, which is the original sense of the word, before it came to be used to refer to the particularly apocalyptic content of St.John's Revelations also called Apocalypse in the latin. The churchly Exegeses are non-canonical explanations of the deeper meanings of the canonical texts. And of course, synopses are shorter summaries, like Cliff Notes (TM) or Master-Plots (TM), and were originally applied to religious writings of course.
If you want a N.Y. Yankees cap, try the Manchester United website instead. They have cross-licensing for SWAG of the two of the biggest "sporting licensing properties" in the world. (One more reason for Bostonians to prefer Arsenal!)
If on the other hand you have the good taste to want something other than NY Yankees, I'm sorry to hear it that you can't get what you want. A sport that calls their finale the "World Series" ought to sell outside the NAFTA FTZ.
Ah, that TAMU map is nice, thanks for pointing that out. The SmartRoutes system covers Boston for audio cellphone, broadcast, and web dissemination of traffic info, but doesn't have realtime mapping, just click-through on a static map to text/iconic live data. Their Philadelphia and Florida operations are similar.
Yes, a dearth of pleasant obstacles and highways laid out by surveyors instead of geological and historical accident does make seeking alternate routes easier. It also means you can get more people living within the 30-mile circle if all of it's above water!
In Boston, whether you have alternate routes available or not depends on where you're coming from and going to... and whether you know the "surface roads" well enough to zig-zag around blockages. A few decades back, a map of the roadnet connecting Rt.128 exits was sold as a detour map... the folks living in those quiet commuter neighborhoods were horrified, and those of us who'd been exploiting the detours available only to locals and the map-literate were not entirely happy at sharing either.
We had spherical watermelon seeds ordered from catalog in (circa) 1975. We were on the borderline of their recommended growing climate in Maine, so they grew to merely baseball to softball size by autumn. Tasty, but small -- single-serving size. Many of them fit in my windbreaker pocket, for eating after school while scoring a soccer game. Much amazment from folks who'd never seen a tiny, round watermelon.
Traceroute will localize my DSL at home pretty closely, yes indeed; even better for small Class C/D domains with single street address. But how well can you geolocate AOL users from their temporary IP addresses?
The IP address in the log for this page-post will traceroute to the corp firewall I went through. Which of our corp datacenters it will show I don't know, it might or might not be in the same state I'm in; I'm pretty sure it's within 2000 miles, probably within 100, maybe within 10. Does that tell you which of our hundreds of offices around the world I abused my internet privileges at to post this? I think not.
Another good reason for those who don't understand the technology to use AOL ?-)
-- Bill N1VUX
which ID will geolocate me better than IP,
if you grok it
Right, Primes have intrinsic information content, so we shouldn't be surprised someone could measure their entropy if they tried. These physicists used their own data-analytic tools to measure this in an empirical way. Whether this provides a new insight to the number theorists or not is yet to be seen, but applying new tools to problems with which mathematicians have been "stuck" has sometimes provided a needed boost.
The pattern they've found is a logarithmic distribution, it seems, according to their abstract. (I need to make time to read the full paper.) This is not unexpected, the Newcombe distribution known as Benford's Law (1) is a well-known logarithmic distribution applicable to most naturally occurring numbers. Benford's law is
F(d)=log(1+1/d)
which applies of course only to the non-zero data in the dataset; it generalizes to
F(ddd..d)=log(1+1/ddd..d)
While their reported entropy power law is logarithmic, Benford's law doesn't appear to fit the prime interval increments. This leaves open the power law the physicists have found is different, suggesting the possibility that there is something interesting and new in their finding. We can hope this gives the number theorists some fresh insight. Since it was posted to the Physics:: Condensed Matter directory of arXiv, it may be a while before the real number theorists even notice it; sci.math.research quite reasonably gets postings of the new listings of only the Math subdirs weekly. We can hope Baez cross-posts it.
--Bill
IANA-Mathematician, but I almost was one and still pretend
Hardly amazing, although it would be if not predicted by number theory. Note that you shouldn't decide 10 of 16 is amazing until you check how many of the range would be prime normally, 15 of 1000. This seems to support the ratio given, but doesn't equal it. By the way, the phenomenon holds up on the first thousand primes quite nicely, but still not exactly 4.375.
Sieve of Eratosthenes
... list of smallest primes can be extended, eg including 5 and 7, and we need only
to consider 48 numbers out of 210, achieving a speed-up factor of even 4.375....
wwwhomes.uni-bielefeld.de/achim/prime_sieve.html - 12k
And also examine report of 7 Consecutive Primes in Arithmetic sequence at 7 consec primes in AP(1995, NMBRTHRY list archive).
I would be interested in a reference to the actual number-theory statement proof of what the ratio in the asymptotic limit actually is.
-- Bill N1VUX
IANA-Mathematician, but I played one in college.
I had a.sig when USEnet was the signet.
What? Bourne isn't interesting because it's not
being developed anymore?
Since the quoted report discusses the ongoing development and community support activities by a self-selected group that consider themselves "loyal opposition" or "fellow travelers", yes, lack of ongoing support and peer interchange with these languages does leave SH, BASH, KSH, and CSH out of the list. What changes in *SH occurred in 2002 that you'd like mentioned?
Other no-shows. It would have been nice if they'd invited the GAWK support community -- maybe they did and GAWK bawked due to license issues?;-). LISP used to be used as an application-scripting language, but that's not how its support community sees it, so they wouldn't be likely to contribute to such a review either (and a fairly fragmented community it is).
The comment on the non-portability of *sh is right-on. That's a major reason I'm writing *sh and awk scripts in Perl these days. (Not having *sh on my laptop helps too. Yes I could get one, but interoperability, portability, and price are all tradeoffs there again -- the good wintel ksh isn't the free one.) CPAN and class/modules are why I write real programs in Perl. But my scripts keep turning into real programs and vice versa now;-)
-- Bill, N1VUX
I had a funny.sig when funny.sigs were funny
World of Science and World of Mathematics covers Astronomy, Biography,Chemistry, Mathematics,and Physics. It's a public service resource by Wolfram Research, the Mathematica people.
There's no universal answer to this problem. If I knew of one, I'd be rich as heck from selling it to companies.
The universal answer is Bonding, and folks have gotten rich selling it for decades if not centuries. (No I don't mean touchy-feely retreats.)
Other posters have provided "Best Practices" for dealing with sysadmins that go bad, but Bonding is the generic procedure for controlling exposure to misbehavior of employees who must be trusted.
James Green directs us to "a Sunday Age (Melborne) article which describes the discovery of a 52 year old computer found in a dusty warehouse weighing in at...
I guess Geek.Com is behind;-)
2. The first Transistor computer, TX-0, was restored to demonstratable condition in the 1980's by The Computer Museum. Yes it worked again, No question; as an original member and early volunteer of TCM (before the first tmove), I was there, and saw it run.
if they were to power it up/were powering it up, they apply voltage gradually to allow the electrolytic capacitors to re-form and the getter rings/compounds [demon.co.uk] in the thermionic devices to restore vacuum [...] so the only thing I'd expect to catch fire would be the young PFY geek[...].
Well, yes, if they did apply it slowly, if the only electrolytics were dry-type. However, it probably has a few de-volitized (dried or leaked) wax electrolytics as well; those and filament and HV transformers are both highly likely to not only give magic smoke but even flame at full voltage. If you ramp those, you may smell smoke before seeing fire.
Interesting question. I'm unclear how normal ethernets of whichever cabling avoid creating groundloops in normal installations on the signal return line, or the old coaxial BNC-thin-net's shields. Maybe the NICs have isolation transformers.
I presume you are talking of how to ground the shields of your shielded cable. To be effective as shields for EMC purposes, you will want the shields grounded to something. Normally, we'd connect any shield at one end to case-ground and leave it open at the other, to avoid ground loops. However, in the rest of the world we are required to bond our RF and Power grounds. Your power ground is floating. For EMC purposes, I'd think it would be the RF ground not the floating AC ground. In which case, you'd want it isolated from computer AC ground / case ground at both ends. How to ensure the AC ground stays floating from the RF ground must be covered in your shipboard electrical codes, good luck.
I'd recommend discussing this with a qualified marine radio installer. They'd be aware of the grounding practices for digital cables in shipboard installations.
The call for unlicensed spectrum allocations in the open letter may be a clue to what the letter-writers think the answer is... unfettered competiton for last mile would benefit firms poised to play there.
Fast failure, yes; and that should apply to firms who overpaid for 3G spectrum as well as those who over-invested in glass or POTS. And for HDTV. But free access to unlicensed spectrum for all? Expand bluetooth vs WiFi until it interfers with the ambulance radios? I don't think that's a good idea.
internet and tech industry pioneers ? There may be some second tier ISPs in the list, but Frankston (Bricklin's co-inventor of the original spreadsheet program etc) is the only pioneer I recognize in that list.
Multiply re-inventing! But wheel-less ...
on
Airborne Mouse
·
· Score: 1
These have existed for AT LEAST two years
Two years? At least 10 years more than that! A colleague of mine back at Wang in the old days had a patent on tilt mice for presenters; he bought his patent back when they laid him off. (Negotiating return of you patents in return for partial waiver of severance is an interesting strategy.) I never say his in production... unless Gyro is his? and his patent may have run out by now, alas.
Of course, the whole point of tilt-mice is they're wheel-less.
Re:Scientists suspect object is space junk
on
Is This Moon Three?
·
· Score: 1
A new and informative article has, in addition to the news that it's been traced back to Apollo 12, both discussions of how to test the hypothesis and
which shows that it is at least in a true-moon orbit and not the horseshoe orbit of moons #2,3,4.
Unlike moons 2,3,4, it's more likely to smash into the Moon or our atmosphere than be re-released to solar orbit.
There are one permanent moon and three temporary moons already.
Satellites: 4
#1 Moon, average distance: 384,000 km (211,265 miles)
#2 Asteroid 3753 Cruithne
#3 Asteroid 1998 UP1
#4 Asteroid 2000 PH5
The Page of #2 Cruithne's Discover has details on the weird "resonant" orbit of #2. #3 and #4 are from same team, and are equally weird. Note that "Horseshoe orbit" is relative to the supposed primary (Earth) as opposed to the actual primary (Sun) around which the pair are mutually resonant. The previously referenced space.com article said it had a booster-like orbit, implying chaotic, but didn't indicate if it was a ?stable? chaotic orbit, a single-lagrange-point orbit, or a quasi-stable multi-lagrangian horseshoe orbit of a temporary (10kyears) or what.
inclusion of support in our seperate [sic] support contract (really cheap support at that).
Who do you get support from? Anyone our corporate masters have heard of? "really cheap support might not impress the "who do we sue?" kind of managers either.
The Jakarta website lists only one support vendor, in Australia. Sounds bigger than tiny, but not "on the mainland" -- still better than "no support available" that I'd heard.
Re:Old idea with problems.. but promising..
on
Going Up?
·
· Score: 1
Skip using it as a garbage disposal, I want to get to the promised orbital and L5 hotels inexpensively.
Arthur C Clarke, who first popularized the idea, was quoted on BBC/WS the other day and on websites as having predicted the Space Elevator would be a reality "Probably about 50 years after everybody quits laughing". The BBC Story online doesn't have that quote, but The Audacious Space Elevator (cache) does, and also says where he got the idea, and has more links. And if you want more information, Google it some more.
As to recent books, Kim Stanley Robinson's colors of Mars series includes destruction of the elevator's catastrophic repercussions as a key plot device. Some sort of fail-safe system is required before it could realistically be built, as the equatorial countries sharing in the falls-down-risk but not sharing in the wealth of the operators would be likely to object. (e.g., Maybe a massively fail-safed self-destruct charge in the mooring to eject it into solar orbit in case of impending collapse?)
Dragging Quantum levels in here is just a red herring or grandstanding. Of course the engergy and frequency of a photon is related by quantum levels; even the kinetic energy being converted as heat must be absorbed and dumped in quantum units, but that's irrelevant to the question at hand. The poster who said frequency was irrelevant was basically correct, there is no resonance involved; that was the key point.
(For other things like cellphones, the ratio of wavelength to body-part size could be critical to efficiency of heating, so frequency can be critical, and is so frequently.)
"FAQs About Water and Steam" (The International Association for the Properties of Water and Steam)
"Sometimes you may hear that the microwaves are interacting with a
resonant frequency of the water molecule (like a radio gets tuned to a
frequency), but that is actually not the case. Anything with a dipole
moment will absorb microwave radiation, so microwave ovens will also
heat fats and sugars, for example. "
FAQ or cache Has link to How Microwaves works sites with more links.
The wavelength of the microwaves needs to be comparable to the size of the object which then gets an induced alternating electrical field. That alternating field drives the molecules as little syncronous induction-motor rotors. Heat being just molecular kinetic energy, it is felt as, and cooks, as, any other heat source, but inside-out.
. It is because of the frequency of the microwave photon.
NO! If you check standard texts, you will find that microwave oven performance is largely insensitive to variation in frequency, and indeed may vary within the ISM band. Domestic microwave ovens are at about 2.5GHz in the Industrial Scientific and Medical (ISM) Band out of historical coincidence (existing allocation, existing equipment) only. Note that has a wavelength of 12cm, a bit long for a molecular resonance. This is very close to the 2.4G part-15 data and part-97 ham bands. The water and water-vapor absorption is quite
weak, being on the flank of the 22GHz weak resonance. Any competent microwave design book, whether for data, radio-astronomy, or diathermy, will have the tables and charts. See for example,
"resonance lines of water [are] at 22 GHz and a very very strong line at 183 GHz. "
CEOS or
cache
You can see in the diagram there that absorption does decrease from 1G to 2.5G, it's nothing like a resonance, it's considered an edge of the low "window". In the 10GHz range, we consider clouds to be lenses not opaque absorbers, and that's higher up that peak's flank.
Under the terms of my ARS radio license, I know I have to abide by federal human/radio safety standards (which will prevent me from anywhere near our full authorized power on 2.4G any time soon! Just thinking about 5W on 10G with feed and dish gain is enough to worry about.). The scarier thing is those who don't know about them are supposed to too.
Q. What will scientific programming look like in 2020?
A. I don't know, but it will be called Fortran '05.
(I heard this joke first as my Government IT shop was slowly preparing to adopt F77 in 1981; as told then it was right on target, in 2001 they probably were using F90 as predicted.)
(Same jokes works for Business DP and Cobol; we're looking at porting legacy VMS Cobol to MicroFocus on AIX to consolidate platforms. Joke used to work for A.I. and Lisp, but Common Lisp has been subsumed by its leading dialect Scheme, which is/not/ named Lisp.)
Slashdot Mirror
The orbit diagrams specifically say they're using 2-body physics and NOT to use them for close-approach calculation or multiple years in the future. So trust the Torino list for closest approach etc.
Tiny chance? Try certainty.
... unless you've already upgraded your compiller and all libraries to full ANSI/ISO C99 compatibility, which some vendors only started shipping recently, and aren't adding any 3rd party libraries in the next 5 years. (I'm hoping to finish the C++98 conversion soon. People keep discovering legacy code!)
... branching out into other languages _early_ combined with _early_ theory exposure seems to be the best predictor for a full, healthy recovery.
C99 added the keyword 'boolean'. Very carefully.
No matter how carefully, it still breaks a lot of libraries which had been using that word as a typedef with that or similar spellings. It's not a tiny chance, it's guaranteed
Sigils/prefixes is a religious issue. Mentioning them with line numbers in the same graf suggests someone hasn't fully recovered from initial exposure to BASIC back before we had lower case. Dijskstra overstated the perniciousness of Basic, but
[SOJ] Why would Perl programmers need to learn a new language, when Perl is a living language that will always be new? [EOJ] :-)
Hmm. Why am I answering a troll from someone named "butane bob"?
Writing a Perl parser without YACC should be reasonable with Perl 6. ;-)
The names are a running gag on church-latin, that interconnects Larry's linguisticism, Damian's eclecticism, and the monastic themery of the Perl Monks' alternate retroynm for .PM. Larry's Apocalypses are not apocalyptic in the common figurative sense (although the neo-Luddites who think the only improvement on Perl5 is PHP or Python may think so), but are the Revelations of the gur, which is the original sense of the word, before it came to be used to refer to the particularly apocalyptic content of St.John's Revelations also called Apocalypse in the latin. The churchly Exegeses are non-canonical explanations of the deeper meanings of the canonical texts. And of course, synopses are shorter summaries, like Cliff Notes (TM) or Master-Plots (TM), and were originally applied to religious writings of course.
If you want a N.Y. Yankees cap, try the Manchester United website instead. They have cross-licensing for SWAG of the two of the biggest "sporting licensing properties" in the world. (One more reason for Bostonians to prefer Arsenal!)
If on the other hand you have the good taste to want something other than NY Yankees, I'm sorry to hear it that you can't get what you want. A sport that calls their finale the "World Series" ought to sell outside the NAFTA FTZ.
>
Yes, a dearth of pleasant obstacles and highways laid out by surveyors instead of geological and historical accident does make seeking alternate routes easier. It also means you can get more people living within the 30-mile circle if all of it's above water!
In Boston, whether you have alternate routes available or not depends on where you're coming from and going to ... and whether you know the "surface roads" well enough to zig-zag around blockages. A few decades back, a map of the roadnet connecting Rt.128 exits was sold as a detour map ... the folks living in those quiet commuter neighborhoods were horrified, and those of us who'd been exploiting the detours available only to locals and the map-literate were not entirely happy at sharing either.
- Bill
Softball sized? much too large.
We had spherical watermelon seeds ordered from catalog in (circa) 1975. We were on the borderline of their recommended growing climate in Maine, so they grew to merely baseball to softball size by autumn. Tasty, but small -- single-serving size. Many of them fit in my windbreaker pocket, for eating after school while scoring a soccer game. Much amazment from folks who'd never seen a tiny, round watermelon.
Bill
wdr or n1vux as appropriate
Traceroute will localize my DSL at home pretty closely, yes indeed; even better for small Class C/D domains with single street address. But how well can you geolocate AOL users from their temporary IP addresses?
The IP address in the log for this page-post will traceroute to the corp firewall I went through. Which of our corp datacenters it will show I don't know, it might or might not be in the same state I'm in; I'm pretty sure it's within 2000 miles, probably within 100, maybe within 10. Does that tell you which of our hundreds of offices around the world I abused my internet privileges at to post this? I think not.
Another good reason for those who don't understand the technology to use AOL ?-)
-- Bill N1VUX
which ID will geolocate me better than IP,
if you grok it
The pattern they've found is a logarithmic distribution, it seems, according to their abstract. (I need to make time to read the full paper.) This is not unexpected, the Newcombe distribution known as Benford's Law (1) is a well-known logarithmic distribution applicable to most naturally occurring numbers. Benford's law is
which applies of course only to the non-zero data in the dataset; it generalizes toWhile their reported entropy power law is logarithmic, Benford's law doesn't appear to fit the prime interval increments. This leaves open the power law the physicists have found is different, suggesting the possibility that there is something interesting and new in their finding. We can hope this gives the number theorists some fresh insight. Since it was posted to the Physics :: Condensed Matter directory of arXiv, it may be a while before the real number theorists even notice it; sci.math.research quite reasonably gets postings of the new listings of only the Math subdirs weekly. We can hope Baez cross-posts it.
For a hint at why it's so, Google +4.375 Primes 210 to get
And also examine report of 7 Consecutive Primes in Arithmetic sequence at 7 consec primes in AP(1995, NMBRTHRY list archive).
I would be interested in a reference to the actual number-theory statement proof of what the ratio in the asymptotic limit actually is.
-- Bill N1VUX .sig when USEnet was the signet.
IANA-Mathematician, but I played one in college.
I had a
Since the quoted report discusses the ongoing development and community support activities by a self-selected group that consider themselves "loyal opposition" or "fellow travelers", yes, lack of ongoing support and peer interchange with these languages does leave SH, BASH, KSH, and CSH out of the list. What changes in *SH occurred in 2002 that you'd like mentioned?
Other no-shows. It would have been nice if they'd invited the GAWK support community -- maybe they did and GAWK bawked due to license issues? ;-). LISP used to be used as an application-scripting language, but that's not how its support community sees it, so they wouldn't be likely to contribute to such a review either (and a fairly fragmented community it is).
The comment on the non-portability of *sh is right-on. That's a major reason I'm writing *sh and awk scripts in Perl these days. (Not having *sh on my laptop helps too. Yes I could get one, but interoperability, portability, and price are all tradeoffs there again -- the good wintel ksh isn't the free one.) CPAN and class/modules are why I write real programs in Perl. But my scripts keep turning into real programs and vice versa now ;-)
-- Bill, N1VUX .sig when funny .sigs were funny
I had a funny
World of Science and World of Mathematics covers Astronomy, Biography,Chemistry, Mathematics,and Physics. It's a public service resource by Wolfram Research, the Mathematica people.
The universal answer is Bonding, and folks have gotten rich selling it for decades if not centuries. (No I don't mean touchy-feely retreats.)
Other posters have provided "Best Practices" for dealing with sysadmins that go bad, but Bonding is the generic procedure for controlling exposure to misbehavior of employees who must be trusted.
Happy Holidays.
-- Bill
1. Fifty-Year-Old Computer Being Restored
I guess Geek.Com is behind ;-)
2. The first Transistor computer, TX-0, was restored to demonstratable condition in the 1980's by The Computer Museum. Yes it worked again, No question; as an original member and early volunteer of TCM (before the first tmove), I was there, and saw it run.
TCM was once of Boston, then of Marlboro, now of SilliValley. See the TCM Project Description and the Alumni page. It was built in 1957, so would be only 45 years old. I'm not sure what happened to it when DEC sold the building, or John McKenzie, who got it to work again. Shag Graetz's classic Creative Computing article on PDP-1 SpaceWar includes it's TX-0 predecessor. (and French translation) The TMRC pages include TX-0 history as well. See also Levy/Hackers
-- bill / n1vux
Well, yes, if they did apply it slowly, if the only electrolytics were dry-type. However, it probably has a few de-volitized (dried or leaked) wax electrolytics as well; those and filament and HV transformers are both highly likely to not only give magic smoke but even flame at full voltage. If you ramp those, you may smell smoke before seeing fire.
bill/n1vux
I presume you are talking of how to ground the shields of your shielded cable. To be effective as shields for EMC purposes, you will want the shields grounded to something. Normally, we'd connect any shield at one end to case-ground and leave it open at the other, to avoid ground loops. However, in the rest of the world we are required to bond our RF and Power grounds. Your power ground is floating. For EMC purposes, I'd think it would be the RF ground not the floating AC ground. In which case, you'd want it isolated from computer AC ground / case ground at both ends. How to ensure the AC ground stays floating from the RF ground must be covered in your shipboard electrical codes, good luck.
I'd recommend discussing this with a qualified marine radio installer. They'd be aware of the grounding practices for digital cables in shipboard installations.
Bill N1VUX (licensed for AMATEUR radio only)
The call for unlicensed spectrum allocations in the open letter may be a clue to what the letter-writers think the answer is ... unfettered competiton for last mile would benefit firms poised to play there.
Fast failure, yes; and that should apply to firms who overpaid for 3G spectrum as well as those who over-invested in glass or POTS. And for HDTV. But free access to unlicensed spectrum for all? Expand bluetooth vs WiFi until it interfers with the ambulance radios? I don't think that's a good idea.
internet and tech industry pioneers ? There may be some second tier ISPs in the list, but Frankston (Bricklin's co-inventor of the original spreadsheet program etc) is the only pioneer I recognize in that list.
These have existed for AT LEAST two years
Two years? At least 10 years more than that! A colleague of mine back at Wang in the old days had a patent on tilt mice for presenters; he bought his patent back when they laid him off. (Negotiating return of you patents in return for partial waiver of severance is an interesting strategy.) I never say his in production ... unless Gyro is his? and his patent may have run out by now, alas.
Of course, the whole point of tilt-mice is they're wheel-less.
The Page of #2 Cruithne's Discover has details on the weird "resonant" orbit of #2. #3 and #4 are from same team, and are equally weird. Note that "Horseshoe orbit" is relative to the supposed primary (Earth) as opposed to the actual primary (Sun) around which the pair are mutually resonant. The previously referenced space.com article said it had a booster-like orbit, implying chaotic, but didn't indicate if it was a ?stable? chaotic orbit, a single-lagrange-point orbit, or a quasi-stable multi-lagrangian horseshoe orbit of a temporary (10kyears) or what.
Who do you get support from? Anyone our corporate masters have heard of? "really cheap support might not impress the "who do we sue?" kind of managers either.
The Jakarta website lists only one support vendor, in Australia. Sounds bigger than tiny, but not "on the mainland" -- still better than "no support available" that I'd heard.
Arthur C Clarke, who first popularized the idea, was quoted on BBC/WS the other day and on websites as having predicted the Space Elevator would be a reality "Probably about 50 years after everybody quits laughing". The BBC Story online doesn't have that quote, but The Audacious Space Elevator (cache) does, and also says where he got the idea, and has more links. And if you want more information, Google it some more.
As to recent books, Kim Stanley Robinson's colors of Mars series includes destruction of the elevator's catastrophic repercussions as a key plot device. Some sort of fail-safe system is required before it could realistically be built, as the equatorial countries sharing in the falls-down-risk but not sharing in the wealth of the operators would be likely to object. (e.g., Maybe a massively fail-safed self-destruct charge in the mooring to eject it into solar orbit in case of impending collapse?)
(For other things like cellphones, the ratio of wavelength to body-part size could be critical to efficiency of heating, so frequency can be critical, and is so frequently.)
The wavelength of the microwaves needs to be comparable to the size of the object which then gets an induced alternating electrical field. That alternating field drives the molecules as little syncronous induction-motor rotors. Heat being just molecular kinetic energy, it is felt as, and cooks, as, any other heat source, but inside-out.
. It is because of the frequency of the microwave photon.
NO! If you check standard texts, you will find that microwave oven performance is largely insensitive to variation in frequency, and indeed may vary within the ISM band. Domestic microwave ovens are at about 2.5GHz in the Industrial Scientific and Medical (ISM) Band out of historical coincidence (existing allocation, existing equipment) only. Note that has a wavelength of 12cm, a bit long for a molecular resonance. This is very close to the 2.4G part-15 data and part-97 ham bands. The water and water-vapor absorption is quite weak, being on the flank of the 22GHz weak resonance. Any competent microwave design book, whether for data, radio-astronomy, or diathermy, will have the tables and charts. See for example,
You can see in the diagram there that absorption does decrease from 1G to 2.5G, it's nothing like a resonance, it's considered an edge of the low "window". In the 10GHz range, we consider clouds to be lenses not opaque absorbers, and that's higher up that peak's flank.
Under the terms of my ARS radio license, I know I have to abide by federal human/radio safety standards (which will prevent me from anywhere near our full authorized power on 2.4G any time soon! Just thinking about 5W on 10G with feed and dish gain is enough to worry about.). The scarier thing is those who don't know about them are supposed to too.
The Federal standard for human / radio absorption safety is available from FCC OET RF Safety Home page ; their Consumer Facts watered down version is Human Exposure To Radio Frequency Fields Federal Communications Commission
73 de radio n1vux
Guido --
;-) Glad to be of service.
Given how informative you've been on the rest of this thread, that's not surprising.
It IS pretty odd having ONE of the TLA's not be a TLA.
bill
Q. What will scientific programming look like in 2020?
/not/ named Lisp.)
.sig is backed up on tape somewhere.
A. I don't know, but it will be called Fortran '05.
(I heard this joke first as my Government IT shop was slowly preparing to adopt F77 in 1981; as told then it was right on target, in 2001 they probably were using F90 as predicted.)
(Same jokes works for Business DP and Cobol; we're looking at porting legacy VMS Cobol to MicroFocus on AIX to consolidate platforms. Joke used to work for A.I. and Lisp, but Common Lisp has been subsumed by its leading dialect Scheme, which is
-- My