KMail has been a little flakey with one of my higher-traffic POP accounts, but this may not be KMails fault, just a coincidence.
In my experience KMail doesn't like high load conditions. Often when I max out the bandwidth on my adsl connection, KMails automatic mail checking will lock up. It takes restarting the app a couple of times for it to get back to normal. Also when you have a complicated mail folder setup with a lot of mail, it takes a long time to switch folders, and when you quit the app, it will take up to 30 seconds to sort out the folders and clean up after itself.
However this is almost my only grief with KMail. Otherwise it's excellent for my needs. It integrates seamlessly with spamassassin and automatically sorts my mailinglists. Really sweet.
First you can easily affort the few dollars out of you payroll each week for the chance of winning the first price. The lottery is not out to ruin you.
If you loose, you are not really any worse off than if you hadn't played at all, but if you win you are significantly better off than you were.
If you don't play, your chance of winning is infinitely smaller. (They are nil.)
Nobody is scamming you in a lottery. Your chances of winning are minute, but everybody knows this.
Since I have a mix of windows and linux boxes, I use smbfs quite a bit. Kernel 2.6 provides three to four times the speed of a 2.4 kernel. Don't know why, if it is better network handling or what, but it is definitely significantly faster.
Other than that ALSA is my major buying point.
The preempt stuff is good too. It doesn't really seem any snappier here, but there is no lockups any more where you have to wait for the kernel to complete some disk access or whatever, now you just get your response quicker.
I see, you're simply anti-unix. You think there should be one monolitic application that has everything integrated to it. Is too damn much work for you to type "esd &".
You seem to be ignoring the fact that using multiple sound servers is a pain in the ass. Whenever you adjust volumes on one server, the setting will be different from the other servers or even the basic pcm volume you get from the driver. Multiple sound servers interfere with each other and is a bad idea.
I prefer just using ALSA and skipping sound servers entirely.
No, but C++ Builder is, and it has all the features of Delphi.
Delphi is not VB.
Right. But that is a feature, not a flaw.
Linux is a server OS, not a desktop OS.
Complete and utter bullshit. Millions of people are running linux on the desktop, including me. The problem is you can't sell software to them, because the want everything to be free.
Well I wouldn't even call a black hole exotic. It's as boring as it could possibly be.
Let's just agree on exactly what kind of an object we are talking about here. A black hole is as I described above a simple event horizon, which is only a mathematical edge, and the singularity at the center (if it's spinning it's a ring).
As you say quantum effects could prevent the singularity from forming. I argue that if you don't have a singularity, you don't have a black hole. I am not saying you couldn't have something that looks and acts similarly though.
Anyway the original question was why a universe which was so dense, didn't collapse into a black hole. And probably the real reason why it wouldn't do that is that all the matter in the universe at that point was evenly distributed. That means that the gravity field lines locally are completely straight. To create a singularity you need the worldlines to be extremely curved.
The classical black hole is very simple. It has an event horizon with a singularity inside. You need just three properties to fully describe it; mass, angular momentum and electric charge. In fact you will almost certainly only need two of those, since if a black hole was charged, it would quickly suck in opposide charge, thereby making it electrically neutral.
The problem is that this description doesn't take quantum mechanics into consideration. A number of basic premises of QM renders the black hole model less than likely. Heisenbergs uncertainty principle states that you cannot possibly know the position and impulse of a particle simultaneously with 100% accuracy. If you limit the singularitys position to the volume inside the event horizon, the random impulse would give it a tiny chance that it would move outside the event horizon and thus revealing a naked singularity in normal space. That's bad.
In reality that description doesn't even hold water. To really understand what a black hole is you would need to combine general relativity with quantum mechanics, and make the theory of quantum gravity. This is something that hasn't been done yet, though some toy theories do seem somewhat promising.
If you asked me I would tell you subj. Black holes don't exist. The compact objects you find around the universe are probably some really exotic things like maybe grava stars.
In any case since it is probably not possible to create a classical black hole, there is need to worry about how the universe managed to escape that destiny. The same quantum effect that prevents black holes from forming, probably also prevented the early universe from meeting an early doom.
When you are part of a study group, people in the group depend on you to show up and work. This is very motivating. In a study group people complement each other, benefiting from their combined knowledge.
At Copenhagen University this is considered so important that when you select the courses for your first semester, you also have to select a study group to join. Later on during your studies it becomes your own responsibility to get a study group.
Re:X is not slow, some WM's for linux are.
on
Qt On DirectFB
·
· Score: 1
Well first of all are you talking about X or XFree86? Let's not confuse the issue.
The network transparency in X is usefull for one thing, running terminal servers. For that you need 100mb networking or else you are screwed. With any modern software (mathematica, IDL, science stuff I have used) running on slower network connection the updates will be so slow that it's not worth the trouble. You have to get the software installed locally instead.
I have tried running those applications on my university account, via my 512/512 adsl connection with data compression and 16 bit color, and it is crap. Graphics disappears when it is covered by another window and and updates are slow as hell.
That leaves XFree86 to be used as a bloated graphics backend for my KDE desktop. And by bloat I mean having to run all my graphics through socket connections to the device driver. It's an unnecessarily complicated way to do it.
And don't give me that about how I can just use a lightweight WM. I depend on KDE and all it's applications. I like KMail, I love Konqueror and a lot of other KDE apps. And besides even lightweight WMs are choppy when dragging windows opaquely.
I am not exactly sure what you mean? Are you saying that because the photons are massless they don't cary impulse?
That is not correct. Photons carry an impulse equaling the equivalent rest mass of the total energy of the particle times the velocity.
The impulse of a photon is:
P = hn/c
h is Planck's constant n is the photon frequency (or color of the light if you will, the bluer the light the more energetic it is). c is Einsteins constant (the speed of light in vacuum).
The reason solar sails work is all because af Newton (yeah the gravity guy..). In a closed system momentum is always conserved. That is if you add up the momentum of one photon before it hits the sail with the momentum of the sail, then after the photon has hit the sail the total momentum must be exactly the same as before. Each photon and the sail in themselves are closed systems.
Now the sail is not a perfect mirror which means some of the photons is absorbed. However let us first look at those photons that get reflected by the mirror. (I would guess at least half of them are reflected, most likely more.)
Each photon has the energy of Planck's quantum:
E=hn (n is the frequency of the wave)
We need Einstein here, he said:
E=mc
And if we put those together and move things around a bit:
m=hn/c
This is the equivalent rest mass of the photon.
Momentum is defined as mass times velocity. Remember that velocity is a vector, this is very important. So the momentum of a photon is:
p = mc = hn/c (the velocity of light is c:)
Now the photon travels toward the sail and finally hits it and gets reflected. Assuming the photon hit the sail in the normal direction, it gets reflected back directly the way it came. So the velocity vector now points in the opposide direction as before. The change in momentum of the photon is thus:
Dp=2*hn/c
Since the total momentum must be concerved the sail HAS to change momentum too, by an exactly equal amount. This means the sail gains forward momentum of an amount 2*hn/c for each photon that is perfectly reflected.
Now the story with absorbed photons is a bit more complicated. Some of the energy of the photon is immidiately converted into forward velocity in the sail. Some however must go into heating the sail up. Here it gets very complicated because depending on how the sail is constructed, how well it conducts heat for instance, some of this heat could also be turned into forward propulsion, however a lot of the energy is probably just lost to heat radiation.
But never the less because of those reflected photons, an increase of speed is guaranteed. And remember there are a lot of photons, all you need is a big sail to catch them with.
Slashdot Mirror
Oh quit whining will you?
They have a perfectly good reason for not providing a binary directly from their homepage, and finding it on other sites like doom9 is very easy.
This is a place where using linux pays off. Because if you only need decoding, your favorite movie player already has built in support for it.
KMail has been a little flakey with one of my higher-traffic POP accounts, but this may not be KMails fault, just a coincidence.
In my experience KMail doesn't like high load conditions. Often when I max out the bandwidth on my adsl connection, KMails automatic mail checking will lock up. It takes restarting the app a couple of times for it to get back to normal. Also when you have a complicated mail folder setup with a lot of mail, it takes a long time to switch folders, and when you quit the app, it will take up to 30 seconds to sort out the folders and clean up after itself.
However this is almost my only grief with KMail. Otherwise it's excellent for my needs. It integrates seamlessly with spamassassin and automatically sorts my mailinglists. Really sweet.
Not sure what you mean by "media library", a Jukebox?
It looks like a media player to me:
Freshmeat project page
Even if that's the old version.
I scandinavian countries, "nu" means now. So here the .nu domain is popular because it supposedly means you get service, now!
Like for instance:
stoprygning.nu (stop smoking now!)
or
nakedgirls.nu (naked girls now!)
You probably mean replace KDE with GNOME.
You can't replace KDE with GTK, since GTK is a toolkit and KDE is a desktop environment.
It goes like this
QT GTK
KDE GNOME
You are missing some important points here.
First you can easily affort the few dollars out of you payroll each week for the chance of winning the first price. The lottery is not out to ruin you.
If you loose, you are not really any worse off than if you hadn't played at all, but if you win you are significantly better off than you were.
If you don't play, your chance of winning is infinitely smaller. (They are nil.)
Nobody is scamming you in a lottery. Your chances of winning are minute, but everybody knows this.
Since I have a mix of windows and linux boxes, I use smbfs quite a bit. Kernel 2.6 provides three to four times the speed of a 2.4 kernel. Don't know why, if it is better network handling or what, but it is definitely significantly faster.
Other than that ALSA is my major buying point.
The preempt stuff is good too. It doesn't really seem any snappier here, but there is no lockups any more where you have to wait for the kernel to complete some disk access or whatever, now you just get your response quicker.
I see, you're simply anti-unix. You think there should be one monolitic application that has everything integrated to it. Is too damn much work for you to type "esd &".
You seem to be ignoring the fact that using multiple sound servers is a pain in the ass. Whenever you adjust volumes on one server, the setting will be different from the other servers or even the basic pcm volume you get from the driver. Multiple sound servers interfere with each other and is a bad idea.
I prefer just using ALSA and skipping sound servers entirely.
Delphi is not C++
No, but C++ Builder is, and it has all the features of Delphi.
Delphi is not VB.
Right. But that is a feature, not a flaw.
Linux is a server OS, not a desktop OS.
Complete and utter bullshit. Millions of people are running linux on the desktop, including me. The problem is you can't sell software to them, because the want everything to be free.
This is why we need Lazarus
That may be.
It still sucks though.
Well I wouldn't even call a black hole exotic. It's as boring as it could possibly be.
Let's just agree on exactly what kind of an object we are talking about here. A black hole is as I described above a simple event horizon, which is only a mathematical edge, and the singularity at the center (if it's spinning it's a ring).
As you say quantum effects could prevent the singularity from forming. I argue that if you don't have a singularity, you don't have a black hole. I am not saying you couldn't have something that looks and acts similarly though.
Anyway the original question was why a universe which was so dense, didn't collapse into a black hole. And probably the real reason why it wouldn't do that is that all the matter in the universe at that point was evenly distributed. That means that the gravity field lines locally are completely straight. To create a singularity you need the worldlines to be extremely curved.
And then there is the whole inflation issue..
Not the black holes you are thinking of at least.
The classical black hole is very simple. It has an event horizon with a singularity inside. You need just three properties to fully describe it; mass, angular momentum and electric charge. In fact you will almost certainly only need two of those, since if a black hole was charged, it would quickly suck in opposide charge, thereby making it electrically neutral.
The problem is that this description doesn't take quantum mechanics into consideration. A number of basic premises of QM renders the black hole model less than likely. Heisenbergs uncertainty principle states that you cannot possibly know the position and impulse of a particle simultaneously with 100% accuracy. If you limit the singularitys position to the volume inside the event horizon, the random impulse would give it a tiny chance that it would move outside the event horizon and thus revealing a naked singularity in normal space. That's bad.
In reality that description doesn't even hold water. To really understand what a black hole is you would need to combine general relativity with quantum mechanics, and make the theory of quantum gravity. This is something that hasn't been done yet, though some toy theories do seem somewhat promising.
If you asked me I would tell you subj. Black holes don't exist. The compact objects you find around the universe are probably some really exotic things like maybe grava stars.
In any case since it is probably not possible to create a classical black hole, there is need to worry about how the universe managed to escape that destiny. The same quantum effect that prevents black holes from forming, probably also prevented the early universe from meeting an early doom.
When you are part of a study group, people in the group depend on you to show up and work. This is very motivating. In a study group people complement each other, benefiting from their combined knowledge.
At Copenhagen University this is considered so important that when you select the courses for your first semester, you also have to select a study group to join. Later on during your studies it becomes your own responsibility to get a study group.
Well first of all are you talking about X or XFree86? Let's not confuse the issue.
The network transparency in X is usefull for one thing, running terminal servers. For that you need 100mb networking or else you are screwed. With any modern software (mathematica, IDL, science stuff I have used) running on slower network connection the updates will be so slow that it's not worth the trouble. You have to get the software installed locally instead.
I have tried running those applications on my university account, via my 512/512 adsl connection with data compression and 16 bit color, and it is crap. Graphics disappears when it is covered by another window and and updates are slow as hell.
That leaves XFree86 to be used as a bloated graphics backend for my KDE desktop. And by bloat I mean having to run all my graphics through socket connections to the device driver. It's an unnecessarily complicated way to do it.
And don't give me that about how I can just use a lightweight WM. I depend on KDE and all it's applications. I like KMail, I love Konqueror and a lot of other KDE apps. And besides even lightweight WMs are choppy when dragging windows opaquely.
- So just turn of opaque window dragging?
- NO, YOU IDIOT!
I am not exactly sure what you mean? Are you saying that because the photons are massless they don't cary impulse?
That is not correct. Photons carry an impulse equaling the equivalent rest mass of the total energy of the particle times the velocity.
The impulse of a photon is:
P = hn/c
h is Planck's constant
n is the photon frequency (or color of the light if you will, the bluer the light the more energetic it is).
c is Einsteins constant (the speed of light in vacuum).
In a sence, even massless particles has mass.
No this is wrong.
:)
The reason solar sails work is all because af Newton (yeah the gravity guy..). In a closed system momentum is always conserved. That is if you add up the momentum of one photon before it hits the sail with the momentum of the sail, then after the photon has hit the sail the total momentum must be exactly the same as before.
Each photon and the sail in themselves are closed systems.
Now the sail is not a perfect mirror which means some of the photons is absorbed. However let us first look at those photons that get reflected by the mirror. (I would guess at least half of them are reflected, most likely more.)
Each photon has the energy of Planck's quantum:
E=hn (n is the frequency of the wave)
We need Einstein here, he said:
E=mc
And if we put those together and move things around a bit:
m=hn/c
This is the equivalent rest mass of the photon.
Momentum is defined as mass times velocity. Remember that velocity is a vector, this is very important. So the momentum of a photon is:
p = mc = hn/c (the velocity of light is c
Now the photon travels toward the sail and finally hits it and gets reflected. Assuming the photon hit the sail in the normal direction, it gets reflected back directly the way it came. So the velocity vector now points in the opposide direction as before. The change in momentum of the photon is thus:
Dp=2*hn/c
Since the total momentum must be concerved the sail HAS to change momentum too, by an exactly equal amount. This means the sail gains forward momentum of an amount 2*hn/c for each photon that is perfectly reflected.
Now the story with absorbed photons is a bit more complicated. Some of the energy of the photon is immidiately converted into forward velocity in the sail. Some however must go into heating the sail up. Here it gets very complicated because depending on how the sail is constructed, how well it conducts heat for instance, some of this heat could also be turned into forward propulsion, however a lot of the energy is probably just lost to heat radiation.
But never the less because of those reflected photons, an increase of speed is guaranteed. And remember there are a lot of photons, all you need is a big sail to catch them with.