I had a few glasses of wine, but let me remind you that we are a long way off from freedom over safety, unless we indulge in the academic spirit our ancestors had so much off:
"My own experience with fluorine has been solely with its compounds. In particular, natural calcium fluoride crystals (fluorite or fluorspar). Also hydrofluoric acid, during a highly ill-advised "experiment" conducted in the clean room of a semiconductor manufacturer unwise enough to employ me.... "
Pretty contermporary I must say.
So are you going to scold me when I wonder which rocketry amateur is ever going to use Flourine as a part of rocket fuel?
Well maybe there is a middle ground somewhere we all can enjoy in relative safety, like how about ozone as an oxidizer?
Still pretty explosive I would say.
I for one am glad for all of us just having ammonium perchlorate for now. I suppose that is why you put safety in apostrophes. Maybe you should have put freedom in apostrophes instead?
The author of said paper might know Chris Fenton in some way, since the verilog code mentions a company named
// Company: D.E. Shaw Research // Engineer: Christopher Fenton // // Create Date: 19:54:35 01/29/2008
Actually, I found a book at google
"Strategic Computing, By Alex Roland, Philip Shiman" that mentions DADO and NonVon being canceled because they didn't offer anything fundamentally new. Compared to the CM they had little staying power.
The moon will move outward slightly faster than it already does. As a result the total eclipses we are able to watch now will become a ring at some point. I know you were trying to be funny but I just had to... .
How about 1000-9000 years old trees? What, you don't trust them? I guess you just don't trust people to let them grow. Why do you trust people to let plants grow and bury them underground?
Actually plants are an interesting and complex factor to the global climate.
Also if there is more water in the atmosphere there would be less pressure on the plants to close their stomata and they could take in more carbon dioxide.
More available water could enable plant growth in places where we now have higher albedo sand. This would reduce albedo and increase local temperatures. Whether this would compensate any cooling I don't know, at least it could make things more complicated (it could also encourage more rain downwind).
Finally I wonder how long the water will stay in the atmosphere. The only long term benefit might well come from plant growth being encouraged by making a big splash.
Books have been written about this topic, just read about climate vegetation interaction.
While C is close to the metal, just try programming in ia64 assembly and implement a filter using loop unrolling and use all the 128 registers you have available (I never had to do this). C at least offers you the potential of doing this for you, depending on the Compiler.
That whole register scheduling business can become a major pain even if you only deal with 32 registers, I'm glad that there is C doing this for me.
With that C becomes much more readable and maintainable than assembly.
You could set out on a literary expedition of your own and find out whether Edward R. Tufte did sufficiently honour that woman. Actually a cursory glance over "The Visual Display of Quantitative Information" didn't turn up anything. Maybe there is something to be found in here:
"... Studies of other oak species have shown that the male flowers do not open and release pollen unless humidity drops below 45% for several hours. In 1998, many of the trees flowered during a period of rainy weather and subsequently produced no acorns. Amount of solar radiation received during the pollination period was positively correlated with acorn production in this year. We additionally found evidence that the size of the prior yearâ(TM)s acorn crop influences acorn yields. Trees that produce large numbers of acorns in one year may not have the resources to produce a large crop in the subsequent year."
Perennials are wonderful when it comes to soil erosion prevention but they just don't have to produce fruit to survive all the time, so they don't - selfish things.
Hubble plus the stuff you mentioned and then some.
>The landers on Mars are interesting, but I haven't seen much tangible value arise from that exploration.
Tons of PhD thesis's and papers. Also geological data about resources is nothing to sneeze at (Just try getting accurate information about oil and how much is left). The problem is that nobody is living on Mars yet. But going there without knowing where to find any water and other resources is kinda dumb.
Lately some staff at SpaceX, formerly employed at NASA, were overheard saying "... who is complaining that rocket scientists are dealing with volatile stuff now". "Surely that 700 billion rescue package rips a hole large enough to fit 5 shuttle programs through, disasters included, and lets see whether the market has some engine restart capability" a colleague added.
Some soon to be space entrepreneur remarked in the past that "Derivatives are like Hydrazine, carrying dangers that, while latent when properly stored, are potentially lethal when coming into contact with a catalyst like house price decline"
Believe me or not but the future of space flight is energetic like the 10000K exhaust of an ion engine.
I have gone overboard but this surely sounds more positive than financial news.
Well, I paid about 100euros per semester. My country is even more socialist than Canada. My university isn't in the top who knows what list though but it seemed reasonable.
I'm wondering whether Obama has to do anything at all towards lowering tuition. I mean will there be enough people around to pay for pricey tuition fees in the near future? I would guess that the market will drive the tuition down if universities have the goal to maintain the student numbers somewhat.
Also I would think that the tuition people are willing to pay is dependent on prospective income and also the banks view on this. This could be a fairly fixed number across the market since we have mostly the same numbers to predict our future I would guess. There is possibly a fairly hard threshold now for the size of the loan in this more cautious climate, my guess would be that universities might try to catch more students by reaching under that threshold and still get higher revenue.
Well I could think of some algorithm books for which you need a good math background and no computer, "The Art of Computer Programming" comes to mind.
If you find some sufficiently educated prisoners this could be something to pass their time with.
But face it, about 20% of all Americans have a bachelors degree or higher. Academics tend to be underrepresented in prison so there is little reason to believe that you will find many takers for this kind of literature in prison.
The degree percentage per person can be found here:
Well it is not just editing some text anymore for me. It is more software development where you would want something like eclipse.
For some odd reason I'm still using XEmacs. You don't have to use the mouse if you don't want to. Indentation works nicer under XEmacs than with eclipses Emacs mode. It is just not the same, even though eclipses project management is nice. Lets not start with search and replace - I don't need a silly window for that.
Fortunately there is still ecb and cedet to improve emacs code browsing a bit.
Now if somebody could tell me whether there is a ddd plugin for eclipse I might give up on emacs and switch over.
If you check out citeseer you might find that the name NUMA came up around 1989. I couldn't find it any earlier. So whatever a 256 core processor will look like, it doesn't have to be something new.
It seems like it should be possible to use already existing parallel architectures in those multi core processors. Although I could imagine that integrating multiple cores on one chip could support architectures which make use of that different type of platform. I don't know how this could look like, but I wouldn't want to rule out that we are going to see something new.
While I don't have an answer to my question, let me mention that I somehow had the dream of ion engines being the best thing since sliced bread since they have such a high exhaust velocity (v_e).
Since v_e affects the delta v linearly as opposed to logarithmically like the mass fraction this is just such a nice knob to play with.
Unfortunately the power plant weight of the ion engine is something we are stuck with forever, so there is no nice mass ratio involved with ion engines.
The other thing is that according to a Wiki article
"if the exhaust velocity can be made to vary so that at each instant it is equal and opposite to the vehicle velocity then the absolute minimum energy usage is achieved. When this is achieved, the exhaust stops in space ^ and has no kinetic energy; and the propulsive efficiency is 100%- all the energy ends up in the vehicle"
So there is little point in using it early in the mission if you want to be efficient.
This quote also motivates the existence of VASIMIR though - you can adjust the exhaust velocity to the current spacecraft speed.
I can't offer any quantitative analysis but I don't expect my previous question to be particularly useful or applicable to any realistic mission.
So, does anyone know what the lowest possible orbit is one can use that thing from?
One reason ion engines cannot be used from ground to orbit is that they need a vacuum to operate, the other one is that the trust is too low to get into orbit.
With Vasimir however one can get higher trust than with typical ion engines. Could it be possible that suborbital trajectories might be enough?
To get a usable orbit one needs an engine which raises the perigee from the ground to a point outside the atmosphere (I even tried this in Orbiter once), could it do that too?
The parent must have suggested we stick to a one dimensional arrangement of pixels where there is no such thing as an imaginary dimension. Just like you should only use good old fashioned real numbers, everything else is just sinister.
Slashdot Mirror
I think your impression is mostly correct.
What you might carry away from it might be a little bit of nostalgia for all those intrepid explorers of the past.
It might also show you that there are some experiments where we should all be glad that safety comes before freedom.
I had a few glasses of wine, but let me remind you that we are a long way off from freedom over safety, unless we indulge in the academic spirit our ancestors had so much off:
http://www.lateralscience.co.uk/Fluorine/Fluorine.html
Check out this part at the end,
"My own experience with fluorine has been solely with its compounds. In particular, natural calcium fluoride crystals (fluorite or fluorspar). Also hydrofluoric acid, during a highly ill-advised "experiment" conducted in the clean room of a semiconductor manufacturer unwise enough to employ me.... "
Pretty contermporary I must say.
So are you going to scold me when I wonder which rocketry amateur is ever going to use Flourine as a part of rocket fuel?
Well maybe there is a middle ground somewhere we all can enjoy in relative safety, like how about ozone as an oxidizer?
Still pretty explosive I would say.
I for one am glad for all of us just having ammonium perchlorate for now. I suppose that is why you put safety in apostrophes. Maybe you should have put freedom in apostrophes instead?
Wouldn't that be a brown shirt?
Reading about Roehm in the Wikipedia entry, I found that he was homosexual
http://de.wikipedia.org/wiki/Ernst_Röhm
(Funny, they never told us that in school), and that despite that he lead such a conservative organization, I have to say he had balls.
Ultimately the SA was a despicable organization that mainly beat up Nazi party opponents. Firefly fans can't possibly be that bad.
Actually I just found a paper about it: http://dli.iiit.ac.in/ijcai/IJCAI-81-VOL-2/PDF/072.pdf
The author of said paper might know Chris Fenton in some way, since the verilog code mentions a company named
Actually, I found a book at google
"Strategic Computing, By Alex Roland, Philip Shiman" that mentions DADO and NonVon being canceled because they didn't offer anything fundamentally new. Compared to the CM they had little staying power.
The moon will move outward slightly faster than it already does. As a result the total eclipses we are able to watch now will become a ring at some point. I know you were trying to be funny but I just had to ... .
How about 1000-9000 years old trees? What, you don't trust them? I guess you just don't trust people to let them grow. Why do you trust people to let plants grow and bury them underground?
Actually plants are an interesting and complex factor to the global climate.
Also if there is more water in the atmosphere there would be less pressure on the plants to close their stomata and they could take in more carbon dioxide.
More available water could enable plant growth in places where we now have higher albedo sand. This would reduce albedo and increase local temperatures. Whether this would compensate any cooling I don't know, at least it could make things more complicated (it could also encourage more rain downwind).
Finally I wonder how long the water will stay in the atmosphere. The only long term benefit might well come from plant growth being encouraged by making a big splash.
Books have been written about this topic, just read about climate vegetation interaction.
While C is close to the metal, just try programming in ia64 assembly and implement a filter using loop unrolling and use all the 128 registers you have available (I never had to do this). C at least offers you the potential of doing this for you, depending on the Compiler.
That whole register scheduling business can become a major pain even if you only deal with 32 registers, I'm glad that there is C doing this for me.
With that C becomes much more readable and maintainable than assembly.
HA, words are cheap!
You could set out on a literary expedition of your own and find out whether Edward R. Tufte did sufficiently honour that woman. Actually a cursory glance over "The Visual Display of Quantitative Information" didn't turn up anything. Maybe there is something to be found in here:
http://www.edwardtufte.com/tufte/books_pp
They seem to not have to worry about surviving like those annuals - wonder why.
Here is something on oak pollination:
http://danr.ucop.edu/ihrmp/oak96.htm
"... Studies of other oak species have shown that the male flowers do not open and release pollen unless humidity drops below 45% for several hours. In 1998, many of the trees flowered during a period of rainy weather and subsequently produced no acorns. Amount of solar radiation received during the pollination period was positively correlated with acorn production in this year. We additionally found evidence that the size of the prior yearâ(TM)s acorn crop influences acorn yields. Trees that produce large numbers of acorns in one year may not have the resources to produce a large crop in the subsequent year."
Perennials are wonderful when it comes to soil erosion prevention but they just don't have to produce fruit to survive all the time, so they don't - selfish things.
>Since landing on the moon, what has NASA done?
Hubble plus the stuff you mentioned and then some.
>The landers on Mars are interesting, but I haven't seen much tangible value arise from that exploration.
Tons of PhD thesis's and papers. Also geological data about resources is nothing to sneeze at (Just try getting accurate information about oil and how much is left). The problem is that nobody is living on Mars yet. But going there without knowing where to find any water and other resources is kinda dumb.
Finally lets have a look at R&D spending:
http://www.aaas.org/spp/rd/histda09.pdf
http://www.aaas.org/spp/rd/res06.pdf
Maybe you should better ask what the overblown health spending has done for you.
Play around with this a bit and you will understand.
http://www.who.int/whosis
Lately some staff at SpaceX, formerly employed at NASA, were overheard saying "... who is complaining that rocket scientists are dealing with volatile stuff now". "Surely that 700 billion rescue package rips a hole large enough to fit 5 shuttle programs through, disasters included, and lets see whether the market has some engine restart capability" a colleague added.
Some soon to be space entrepreneur remarked in the past that "Derivatives are like Hydrazine, carrying dangers that, while latent when properly stored, are potentially lethal when coming into contact with a catalyst like house price decline"
Believe me or not but the future of space flight is energetic like the 10000K exhaust of an ion engine.
I have gone overboard but this surely sounds more positive than financial news.
I'm sure she would spend $10 on that:
http://www.despair.com/mis24x30prin.html
"... or get a degree in a medical profession"
The difference seemed so little:
http://www.webmd.com/mental-health/features/psychology-vs-psychiatry-which-is-better
Well, I paid about 100euros per semester. My country is even more socialist than Canada. My university isn't in the top who knows what list though but it seemed reasonable.
I'm wondering whether Obama has to do anything at all towards lowering tuition. I mean will there be enough people around to pay for pricey tuition fees in the near future? I would guess that the market will drive the tuition down if universities have the goal to maintain the student numbers somewhat.
Also I would think that the tuition people are willing to pay is dependent on prospective income and also the banks view on this. This could be a fairly fixed number across the market since we have mostly the same numbers to predict our future I would guess. There is possibly a fairly hard threshold now for the size of the loan in this more cautious climate, my guess would be that universities might try to catch more students by reaching under that threshold and still get higher revenue.
Well I could think of some algorithm books for which you need a good math background and no computer, "The Art of Computer Programming" comes to mind.
If you find some sufficiently educated prisoners this could be something to pass their time with.
But face it, about 20% of all Americans have a bachelors degree or higher. Academics tend to be underrepresented in prison so there is little reason to believe that you will find many takers for this kind of literature in prison.
The degree percentage per person can be found here:
http://www.census.gov/population/www/socdemo/education/phct41.html
The statement that there are less academics in prison is supported here:
http://www.policyalmanac.org/crime/archive/education_prisons.pdf
Well it is not just editing some text anymore for me. It is more software development where you would want something like eclipse.
For some odd reason I'm still using XEmacs. You don't have to use the mouse if you don't want to. Indentation works nicer under XEmacs than with eclipses Emacs mode. It is just not the same, even though eclipses project management is nice.
Lets not start with search and replace - I don't need a silly window for that.
Fortunately there is still ecb and cedet to improve emacs code browsing a bit.
Now if somebody could tell me whether there is a ddd plugin for eclipse I might give up on emacs and switch over.
They almost got it right:
http://www.youtube.com/watch?v=twiv6-xe47A
Maybe if we had a picture we could help.
Correct! We need to be reminded, that not everyone has lost her or his sanity yet.
This post is somewhat redundant now but I have been wondering about the same thing and then I found out about NUMA:
http://lse.sourceforge.net/numa/
If you are looking for a NUMA machine running Linux have a look at this.
http://www.sgi.com/products/servers/altix/4000/
If you check out citeseer you might find that the name NUMA came up around 1989. I couldn't find it any earlier. So whatever a 256 core processor will look like, it doesn't have to be something new.
It seems like it should be possible to use already existing parallel architectures in those multi core processors. Although I could imagine that integrating multiple cores on one chip could support architectures which make use of that different type of platform. I don't know how this could look like, but I wouldn't want to rule out that we are going to see something new.
Don't worry lawyers buy their music, they have enough money for it.
Oh, I feel so conservative today. Here is another one - don't worry it will trickle down again somehow, and then people will buy music.
While I don't have an answer to my question, let me mention that I somehow had the dream of ion engines being the best thing since sliced bread since they have such a high exhaust velocity (v_e).
Since v_e affects the delta v linearly as opposed to logarithmically like the mass fraction this is just such a nice knob to play with.
Unfortunately the power plant weight of the ion engine is something we are stuck with forever, so there is no nice mass ratio involved with ion engines.
The other thing is that according to a Wiki article
http://en.wikipedia.org/wiki/Spacecraft_propulsion
the propulsion efficiency behaves as follows:
"if the exhaust velocity can be made to vary so that at each instant it is equal and opposite to the vehicle velocity then the absolute minimum energy usage is achieved. When this is achieved, the exhaust stops in space ^ and has no kinetic energy; and the propulsive efficiency is 100%- all the energy ends up in the vehicle"
So there is little point in using it early in the mission if you want to be efficient.
This quote also motivates the existence of VASIMIR though - you can adjust the exhaust velocity to the current spacecraft speed.
I can't offer any quantitative analysis but I don't expect my previous question to be particularly useful or applicable to any realistic mission.
Funny how you guys have forgotten the work and effort which goes into this or how the saying goes,
"Per aspera ad astra"
So, does anyone know what the lowest possible orbit is one can use that thing from?
One reason ion engines cannot be used from ground to orbit is that they need a vacuum to operate, the other one is that the trust is too low to get into orbit.
With Vasimir however one can get higher trust than with typical ion engines. Could it be possible that suborbital trajectories might be enough?
To get a usable orbit one needs an engine which raises the perigee from the ground to a point outside the atmosphere (I even tried this in Orbiter once), could it do that too?
The parent must have suggested we stick to a one dimensional arrangement of pixels where there is no such thing as an imaginary dimension. Just like you should only use good old fashioned real numbers, everything else is just sinister.