manned exploration of mars is certainly a good long way away, but this is certainly something that needs to be kept in mind. as far as that goes, unmanned surface explorer designers would probably want to know about it too...
considering NASA/JPL has plans for inflatable rovers for surface exploration, it might be good for them to know how these craft will peform in high wind dust storms.
right now, the more immediate question is how will this affect the aerobraking performance of the Mars Odyssey spacecraft which is supposed to arrive in 11 days. Last week, there was an article/discussion on aerobraking, if you feel like browsing it at +3 and seeing if anyone had something really intelligent to say about it.
well, it's about time things like this started happening. nobody should be surprised that it's people involved in the tech industry that are leading the way in this front, because they don't have their heads uptheir asses.
It's been espoused here and everywhere else that the cat's out of the bag, and the media industry has been changed forever, blah blah blah, so...
is because everybody breaks the law. i mean, come on... lots of people like to flap their gums about "invasion of privacy" and "constitutional rights" and those are great things to discuss. really, i have no problem with that; but i think the real reason that your everyday joe sixpack doesn't like this kind of thing is that he's got something to hide.
i'll be the first to admit that i break laws occasionally, and if you think about it, you probably do too. now, who wants the government to be able to spot you every time you speed, or forget to include something on your income taxes, or pay that auto mechanic cash to avoid the sales tax, or the warez you've got, or the mp3's of copyrighted music you didn't pay for, or whatever...
i don't see how the "if you're not doing anything wrong, you've got nothing to hide" argument can hold weight with anyone, possibly excluding some of the clergy, because 99.99% of the population is probably doing something illegal fairly regularly.
NB - this semi-rant is my opinion only. i have absolutely no facts or information from any kind of recognized source to back this up.:)
Molecule size has nothing to do with what he just said... size == volume != mass.He said that the mass ratio of a helium atom to a hydrogen atom is ~4:1, and he's right.
Hydrogen nucleus - 1 proton
Helium - 2 protons, 2 neutrons
We don't care about the electons since their mass is 1/1836 of an amu.
As far as the mass of a volume of a gas goes, the ideal gas law states that
PV = nRT
Where P=pressure, V=Volume, n=quantity (usually in moles), R=ideal gas constant, and T=absolute temperature
Molecular/molar mass or size does not play a role in this relationship. BTW, here's some information on hydrogen for people who are interested, although the site does imply that hydrogen played a role in the hindenberg disaster, which has apparently been stripped of the crown as the cause of the fire/explosion, losing out to the champeen, solid rocket fuel. woo.
If they have to describe something non-existant, at least make
up a new word for it! Instead of "ip-chains multiplexor" for a time machine, or some shit like that.
Like the "flux capacitor"?
Crazy old Doc Brown... why the hell couldn't he just call it an "inductor" like everyone else?
hmmm... too bad. they certainly aren't using it in my department. perhaps the IT people use it... although even then it would only be sysadmins; i doubt that *nix boxes would be of much use to support staff who are supporting a very very large M$ shop.
Re:The good and the bad of it
on
GPS Meets PCS
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· Score: 1
But I think the level of paranoia we are seeing in the posts on this subject is unwarranted by legislation that merely asks for E911 systems to be better equipped to locate the origin of calls.
I think the level of paranoia we are seeing in the posts on most subjects is unwarranted.
Then answer his question with some of the many sucessful linux conversions that HAVE taken place. Burlington coat factory, General Motors, City Governments, China.
General Motors? do you mind if i ask where you got that information? in what part of their business does GM use linux?
true dat. whether or not somebody knows this sort of trivial crap has absolutely no bearing on their interpretation or appreciation of the author's message and ideas.
Unfortunately, they wouldn't be much help in the WTC situation, where everything is buried under tons of rubble, but there are some really amazing things being done in the Association for Unmanned Vehicle Systems InternationalInternational Aerial Robotics Competition. My school has had a team for a few years, and they kick ass. The goal: Autonomous flying robots with vision, image recognition, hazard avoidance, and more. This stuff is frickin cool.
no offense (IANATroll), but will you really be in touch with your lawyer? i mean, i know that the US is the most litigious society in the world, but will you really file a lawsuit over a CD not working in your equipment?
As far as that goes, does the record company have any obligation to you to produce a CD which is compatible with your player of choice? Even if you sue them, the worst thing that can probably happen is that they'll be forced to acknowledge in the liner notes that the CD is not red book standard
Well, it might be a bad question... if I'm correct in assuming that by F sub s you mean static force of friction, and F sub k means kinetic force of friction, then you're wrong about F sub k being higher that F sub s. The opposite is true.
The formulae for static and kinetic friction are:
F(s) (lessthan)= u(s)N *
F(k) = u(k)N
Where the u's are actually mu's (use your imagination), which are the coefficients of friction, and N is the weight of the object (mass*9.81 m/s^2)
If you look at a table of friction coefficients, you'll see that the coefficient of static friction is always less than the coefficient of kinetic friction.
As far as why static friction is always higher than kinetic friction, I always thought (IANAPhysicist) that it makes sense if you look at it on a microscopic scale. Surface roughness now looks like "mountains" sticking out of the surface of the two objects in question. When there is no relative motion between the objects, the mountains are fully interlocked, and it takes some extra force to get them unstuck. But once you get them moving, they bounce along off of each other, but they don't get fully interlocked of course, because on the scale of surface irregularities, 1 mm/sec is still pretty damn fast.
I always thought of friction coefficients as a statistical average of the "roughness" of two surfaces.
* sorry, I don't know the Unicode for a lessthan sign.
Everybody seems to have lots of interesting things to say about various tools, but I wanted to ask the public-at-large if these tools are clever enough to support networks with multiple physical layers? I've seen network diagrams at work where there's ethernet, oc-12, oc-3, RS-232, RS-485, ControlNet, DeviceNet, DataHighway, Modbus, Profibus, etc. all on the same diagram. It is not pretty, to say the least.
Autocad could do the job, I guess, but Autocad can do a lot of things, and isn't necessarily the best tool available for all of them. So, anybody got any suggestions?
The answer is obvious. *nix admins don't need to worry because the people writing these things run *nix on their boxes, and they're not interested in screwing themselves over.
then again, perhaps i'm overestimating the self-preservation instincts of the script-kiddies
most computer systems have auxillary timers that they use for actually keeping time. for example, in an architecture/assembly language course i just took in the summer, we were using a motorola coldfire processor, and a MC68901 multifunction peripheral controller, which includes 4 independant timers. We wrote some assembly routines which set up one of the timers (i believe they used a 25MHz clock) so that running the signal through a 1/16 clock divider and then to an accumulator which generated an interrupt when it reached a certain value
(25 000 000/16 = 1 562 500), i.e. once every second. The ISR that responded to this interrupt was our system clock.
Of course, this system relies on software to do all the work. A real system clock would just be the same thing implemented in hardware.
frankly i don't care if you run a legitimate business. i still don't want unsolicited email in my inbox. if i am already a customer of yours, then fine. i'm obviously already interested in your product. but, when i send my mother flowers on mother's day, it really pisses me off when within a week i'm getting spam for swedish penis enlargers, 0% mastercards, and "fabulous business opportunities". if i was interested in any of these things, i could find them on the net myself. i don't want you and 5 million other assholes sending email to me to tell me about it.
btw, i think your analogy sucks. i think it would be more akin to every business owner in the city calling you on the telephone to tell you about the great deals they have. eventually you dread answering the phone because you know it's just going to be more crap to waste your time. THAT is what spam is akin to.
a lot of people seem to be taking a crap on this whole central control via networks idea, and the use of WinNT. do you not think that disney has paid people more experienced and smarter than you to think about this stuff? probably a big load of EE's and CE's? this is what they do. complex, real-time, distributed automation systems are not going to be put together without taking this stuff into account.
there's probably so much frikin redundancy and error checking in the system it's not even funny. as somebody already pointed out, you've got the whole POS system running on the network, so that should probably motivate them to make it work well... and, they've got ride control and god knows what else running on it. does the word liability mean anything to you? does disney want to get sued because people died on a ride cuz NT decided to take a nap? i don't think they'll let that happen. i'm pretty sure that most 1st world countries have regulations regarding control systems on things like this, anyways.
i don't know about japan, but in canada, stuff like this has to be designed and checked by a professional engineer. one with practitioner's insurance. cuz if something screws up, it's his/her fault.
I don't think there's any question that if this becomes mainstream, a fairly comprehensive library of digital logic functions will be developed, similar to C++'s STL or Java's class libraries. The Xilinx software I used in my digital design course already had a pretty good selection of SSI and MSI components (BCD functions, adders, shift registers, etc.), and obviously further libraries would be devloped, both for common algorithms and specialized ones (i.e. scientific).
BTW, if anyone is really interested in FPGA's, Xilinx has a hellass pile of info here.
Finally, I wanted to ask any current FPGA users if they find that they get different performance stats on the same design on different compiles. When I was doing work on Xilinx, I found that the compiler would produce designs of various speed, based on routing and the number of CLB's it used. On a couple of occasions, my longest path delay was decreased by about 25% just because i recompiled a couple of times.
taking liberties with your phrasing and assuming you meant North America, I can tell you about Canada, too...:)
here, high school is the same as the states... ages 13-17, approximately. some people also call it secondary school (earlier years being taught at elementary/primary school)
universities are degree-granting institutions (i.e. bachelors, masters, Ph.D.)
as far as I know (I don't speak for everyone...), most people in canada think of colleges as non-degree granting post-secondary institutions. I think they're typically called community colleges in the states. people usually go there to learn a trade (i.e. electrician, millwright, welder, etc.) or skill of some kind (network admin, dental assistant, firefighter).
-school is just a general term for anywhere people go to be educated
(1) Can anybody tell me about a successful copy protection scheme that has been devised to date?
I mean, I know my memory has been going downhill ever since the age of 14 (ah, the glorious early 90's...), but I know I can't think of one that hasn't been hacked...
holy disillusioned batman... i mean, come on... it's an often-discussed topic that the media only reports on topics that bring viewers, i.e. human conflict. don't try and tell us that all government employees are bad just because a few are. that's ignorant.
I won't touch your discussion of the US waging war on various countries, because that's an entirely different issue, IMHO.
However, I have to say that your comments about profs do kind of piss me off. I don't know where you go/went to school, but the profs that i deal with here are dedicated and intelligent, and in all likelihood, worked their asses off to get where they are. Most of them are probably a hell of alot smarter than you or I.
What a discussion... oh, how we all love our free music. Anyways...
(1)On the other hand: isnt it legal to copy music to tapes or other analog media and share it with my friends?
- Somebody correct me if I'm wrong, but I didn't think it was... On the other hand, I am allowed to make backup copies for my personal use, so that I can store the originals in a safe place. Which is exactly why I have burned psx games, burned CD's, copied videotapes, DIVX's, MP3's, and all the rest... they're all just "backup copies" of my "originals". I've simply taken the originals and put them in a safe and hidden place, where they can't be damaged by fire, flood, or alien anal probes. In fact, this place is so well hidden, I can't even find them anymore!!! Good thing I have these handy "backups".
(2)I could get the files t-e-c-h-n-i-c-a-l-l-y via E-Mail or FTP from a friend
- Damn right you could, which is exactly what most of the people reading this will probably do. The RIAA isn't trying to kill Napster simply because it exists. They're trying to kill it because any idiot can use it. The sad truth is most people don't have much in the way of technical knowledge, computer skills, or whatever. Whether it's because of fear of breaking something, or some sort of widespread cranial-rectal inversion syndrome (aka having one's head up one's ass), I don't know. But anyways, the RIAA likes these people, because these people like doing things the easy way. I know most of you probably think using ftp is about as easy as Britney (saving herself for marriage, yeah right), but alot of people wouldn't know how to use it if their lives depended on it. As long as the community of people who rip MP3's and share them remains small and unobtrusive, we should all be fine. It's a shame that my mom and dad won't be able to figure out how to get free music via ftp once napster is gone, but them's the brakes.
Slashdot Mirror
considering NASA/JPL has plans for inflatable rovers for surface exploration, it might be good for them to know how these craft will peform in high wind dust storms.
right now, the more immediate question is how will this affect the aerobraking performance of the Mars Odyssey spacecraft which is supposed to arrive in 11 days. Last week, there was an article/discussion on aerobraking, if you feel like browsing it at +3 and seeing if anyone had something really intelligent to say about it.
It's been espoused here and everywhere else that the cat's out of the bag, and the media industry has been changed forever, blah blah blah, so...
summary of the discussion about to ensue:
i'll be the first to admit that i break laws occasionally, and if you think about it, you probably do too. now, who wants the government to be able to spot you every time you speed, or forget to include something on your income taxes, or pay that auto mechanic cash to avoid the sales tax, or the warez you've got, or the mp3's of copyrighted music you didn't pay for, or whatever...
i don't see how the "if you're not doing anything wrong, you've got nothing to hide" argument can hold weight with anyone, possibly excluding some of the clergy, because 99.99% of the population is probably doing something illegal fairly regularly.
NB - this semi-rant is my opinion only. i have absolutely no facts or information from any kind of recognized source to back this up. :)
Hydrogen nucleus - 1 proton
Helium - 2 protons, 2 neutrons
We don't care about the electons since their mass is 1/1836 of an amu.
As far as the mass of a volume of a gas goes, the ideal gas law states that
PV = nRT
Where P=pressure, V=Volume, n=quantity (usually in moles), R=ideal gas constant, and T=absolute temperature
Molecular/molar mass or size does not play a role in this relationship. BTW, here's some information on hydrogen for people who are interested, although the site does imply that hydrogen played a role in the hindenberg disaster, which has apparently been stripped of the crown as the cause of the fire/explosion, losing out to the champeen, solid rocket fuel. woo.
Christianity: It's always trying to ram crap down your throat.
Like the "flux capacitor"?
Crazy old Doc Brown... why the hell couldn't he just call it an "inductor" like everyone else?
hmmm... too bad. they certainly aren't using it in my department. perhaps the IT people use it... although even then it would only be sysadmins; i doubt that *nix boxes would be of much use to support staff who are supporting a very very large M$ shop.
I think the level of paranoia we are seeing in the posts on most subjects is unwarranted.
General Motors? do you mind if i ask where you got that information? in what part of their business does GM use linux?
true dat. whether or not somebody knows this sort of trivial crap has absolutely no bearing on their interpretation or appreciation of the author's message and ideas.
Unfortunately, they wouldn't be much help in the WTC situation, where everything is buried under tons of rubble, but there are some really amazing things being done in the Association for Unmanned Vehicle Systems International International Aerial Robotics Competition. My school has had a team for a few years, and they kick ass. The goal: Autonomous flying robots with vision, image recognition, hazard avoidance, and more. This stuff is frickin cool.
As far as that goes, does the record company have any obligation to you to produce a CD which is compatible with your player of choice? Even if you sue them, the worst thing that can probably happen is that they'll be forced to acknowledge in the liner notes that the CD is not red book standard
The formulae for static and kinetic friction are:
F(s) (lessthan)= u(s)N *
F(k) = u(k)N
Where the u's are actually mu's (use your imagination), which are the coefficients of friction, and N is the weight of the object (mass*9.81 m/s^2)
If you look at a table of friction coefficients, you'll see that the coefficient of static friction is always less than the coefficient of kinetic friction.
As far as why static friction is always higher than kinetic friction, I always thought (IANAPhysicist) that it makes sense if you look at it on a microscopic scale. Surface roughness now looks like "mountains" sticking out of the surface of the two objects in question. When there is no relative motion between the objects, the mountains are fully interlocked, and it takes some extra force to get them unstuck. But once you get them moving, they bounce along off of each other, but they don't get fully interlocked of course, because on the scale of surface irregularities, 1 mm/sec is still pretty damn fast.
I always thought of friction coefficients as a statistical average of the "roughness" of two surfaces.
* sorry, I don't know the Unicode for a lessthan sign.
Autocad could do the job, I guess, but Autocad can do a lot of things, and isn't necessarily the best tool available for all of them. So, anybody got any suggestions?
then again, perhaps i'm overestimating the self-preservation instincts of the script-kiddies
Of course, this system relies on software to do all the work. A real system clock would just be the same thing implemented in hardware.
btw, i think your analogy sucks. i think it would be more akin to every business owner in the city calling you on the telephone to tell you about the great deals they have. eventually you dread answering the phone because you know it's just going to be more crap to waste your time. THAT is what spam is akin to.
Somebody's been playing too much Deus Ex...
there's probably so much frikin redundancy and error checking in the system it's not even funny. as somebody already pointed out, you've got the whole POS system running on the network, so that should probably motivate them to make it work well... and, they've got ride control and god knows what else running on it. does the word liability mean anything to you? does disney want to get sued because people died on a ride cuz NT decided to take a nap? i don't think they'll let that happen. i'm pretty sure that most 1st world countries have regulations regarding control systems on things like this, anyways.
i don't know about japan, but in canada, stuff like this has to be designed and checked by a professional engineer. one with practitioner's insurance. cuz if something screws up, it's his/her fault.
BTW, if anyone is really interested in FPGA's, Xilinx has a hellass pile of info here.
Finally, I wanted to ask any current FPGA users if they find that they get different performance stats on the same design on different compiles. When I was doing work on Xilinx, I found that the compiler would produce designs of various speed, based on routing and the number of CLB's it used. On a couple of occasions, my longest path delay was decreased by about 25% just because i recompiled a couple of times.
here, high school is the same as the states... ages 13-17, approximately. some people also call it secondary school (earlier years being taught at elementary/primary school)
universities are degree-granting institutions (i.e. bachelors, masters, Ph.D.)
as far as I know (I don't speak for everyone...), most people in canada think of colleges as non-degree granting post-secondary institutions. I think they're typically called community colleges in the states. people usually go there to learn a trade (i.e. electrician, millwright, welder, etc.) or skill of some kind (network admin, dental assistant, firefighter).
-school is just a general term for anywhere people go to be educated
I mean, I know my memory has been going downhill ever since the age of 14 (ah, the glorious early 90's...), but I know I can't think of one that hasn't been hacked...
However, I have to say that your comments about profs do kind of piss me off. I don't know where you go/went to school, but the profs that i deal with here are dedicated and intelligent, and in all likelihood, worked their asses off to get where they are. Most of them are probably a hell of alot smarter than you or I.
(1)On the other hand: isnt it legal to copy music to tapes or other analog media and share it with my friends?
- Somebody correct me if I'm wrong, but I didn't think it was... On the other hand, I am allowed to make backup copies for my personal use, so that I can store the originals in a safe place. Which is exactly why I have burned psx games, burned CD's, copied videotapes, DIVX's, MP3's, and all the rest... they're all just "backup copies" of my "originals". I've simply taken the originals and put them in a safe and hidden place, where they can't be damaged by fire, flood, or alien anal probes. In fact, this place is so well hidden, I can't even find them anymore!!! Good thing I have these handy "backups".
(2)I could get the files t-e-c-h-n-i-c-a-l-l-y via E-Mail or FTP from a friend
- Damn right you could, which is exactly what most of the people reading this will probably do. The RIAA isn't trying to kill Napster simply because it exists. They're trying to kill it because any idiot can use it. The sad truth is most people don't have much in the way of technical knowledge, computer skills, or whatever. Whether it's because of fear of breaking something, or some sort of widespread cranial-rectal inversion syndrome (aka having one's head up one's ass), I don't know. But anyways, the RIAA likes these people, because these people like doing things the easy way. I know most of you probably think using ftp is about as easy as Britney (saving herself for marriage, yeah right), but alot of people wouldn't know how to use it if their lives depended on it. As long as the community of people who rip MP3's and share them remains small and unobtrusive, we should all be fine. It's a shame that my mom and dad won't be able to figure out how to get free music via ftp once napster is gone, but them's the brakes.