> 1) Film type. What should I go with? I was thinking of a low-grain slow film like Reala, but would a faster film be preferable?
> 2) Shutter length. What is the minimum shutter length to get a deep view of the sky but also avoid capturing the rotation of the earth?
> 3) Lens. Is there an ideal focal length? I was thinking wider is better to capture more of the sky and possibly some earth-based objects
It is easy to estimate this. The sky (well...the Earth) rotates in about 24 hours: given the shutter length and the apparent distance of the stars from North (South if you live in the southern emisphere), you get the apparent rotation of your target. In order to avoid a blurred image, the apparent displacement must be smaller than the diameter of the circle of confusion of your lens, which also depends from the focal lenght of your lens and from the f/stop you use. Shutter lenght and f/stops are also related to the film sensitivity you use. Excel is your friend...
From my experience (I like taking landscape night shots) I start noticing blurred images of stars while shooting with an exposure time longer than about 10 seconds and a 50mm lens. If you need a longer exposure, consider using a polar mount and a motor for tracking stars. Before shooting, look around for incoming airplanes, Iridium flares, or other flying objects: they can ruin your shots...
Towards the end of the web page they say that they stitched all the images together using this software.
I personally use this free program for photo stitching, but if you look around with google, you can find plenty of them to use.
I too use NTFS on USB media. It works, it keeps track of acces permissions to files, and it can be easily shared with non-Linux users. As a second option I use the native FAT32 system used for pre-formatting USB drivers. I think that using Linux-native file system (like ext3) would make my USB driver too anti-social with respect to people with whom I share data, but I am not a technical geek.
In 1973 FIAT (the italian car company) put on the market this device (sorry guys, but it is in italian). There are still some cogenerators working around there, but from a commercial point of view it was near a failure. It will be interesting to see what happens to WV generator.
> The company says the consolidation, which physically separates Microsoft engineers from the servers running their test code
So, if engineers are fare away from the server running their test code, how do they press the reset button when the server shows the BSOD ?!?
Some years ago I added a device like this to a BSD box that I used as a NFS server in my home network. There are several projects like this available in internet using different microcontrollers. Simply map the terminal push buttons to perform some useful commands (like starting a safe reboot script), and you have an emergency exit for your box.
You might also try this: start a VNC server on your box at boot time, and set up as well a network connection using either the serial port or better a USB port (using usbnet). This should allow you to access the system X display through USB/serial. I am afraid however that there is not an easy solution for accessing remotely the BIOS screen before the OS starts.
ARRL also gave some notice about possible health risks related to ham radio activities. It seems that risks associated with strong RF fields should not be underestimated, indeed.
Maybe not: see for example this paper. Indirect observation of gravitational waves proves nothing. We shouldn't forget that aether was supposed to exist by indirect proof...
> You just need to find the group that is still willing to learn and find new innovative projects to work on.
Before quitting ham radio years ago I was developing by myself an innovative DSP device for radio work (it was a high performance RTX IF strip, partly hardware and partly software). It was something very different from what you see around now, since I used some methods that at that time were probably unknown to the ham radio community (although some work was being done about radio and DSP, but my approach was different). It suffices to say that some of the algorithms I developed at that time have been "rediscovered" by a major chip vendor last year: so I guess that what I was designing qualified as innovative.
My plans was to give around the plans for building it, as well as the executables: after all I was designing it for fun, and I hoped that somebody else could have fun playing with it and learning how it worked. Well, when the rumours about what I was developing started spreading around, I started receiving endless requests for a kit, possibly with all solder work done in advance (and no, I wasn't using SMD technology, so it was quite viable to everybody). Some Linux zaelots had nothing better to do that to scream that everything I did had to be put in the public domain (needless to say, they gave nil contribution to my work), and two people who were asked to do some beta-testing never had the time (or interest ?!?) to do it. I soon realized that nobody at all showed interest into learning what there was "under the hood", so I decided that it was better to give up. All I wanted was simply to have around people interested into learning and experimenting, (hoping as well to learn something from them and from their questions): for sure I did not want to start a Heathkit-like company.
Part of what I designed ended its life into an application for my employer: this gave me in return plenty of appreciation, a small career advancement, and no complaints at all. Then I started thinking about the meaning of "hobby"...and I quitted!
I had plenty of friends involved with ham radio and radio listening, who had in their homes several CFL bulbs. None of them ever reported interference coming from CFL lamps. The trouble is noth with CFL technology, but in the way some homes are wired.
Ham radio was the entry point to technology for me too, but I am probably younger than you (I am 47), and I soon realized that, after a few years with ham radio, there was nothing new to learn.
Radio amateurs here in my city were too interested into buying technology, rather than learning about it, so it was time to say goodbye. My job offered me much more opportunities to learn about new technologies (and, most important, to have an active part in them), and so I sold all my ham radio equipment.
Sometimes I think if I should go back to ham radio when I retire, but I always answer to myself a big "NO": things like digital photography and internet are cheaper, technologically more challenging, and much more socially shareable with other people than ham radio, so my choice is done.
I do not back up the idea of dropping ham radio for BPL, but I believe that the importance of this hobby as a way of self-learning should be quite reconsidered. Just my 0.02 USD...
Here you can find a brief description of the Milky Way structure. In the time frame of 1 Gy our solar system makes probably four revolutions around the center of our galaxy. I try to make an example about what is the problem with the theory related with TFA. Suppose you live in New York City: get out from your home, look carefully to people around you, then get into the underground. Make four trips all around the city, and go back home. Are the very same people you met before still all around you ?!? Some of your neighbours for sure, others don't, somebody who previously was hidden is now in sight of you, and somebody else died or emigrated elsewhere.
Now you are the solar system: what if one of your neighbours is like this one ? And what about dark matter (if ever exists) ?
My point is that to prove or disprove the theories from Shaviv or Mellot we need something better than a piece of paper with a sketch of our galaxy, and a sign showing "you are here". I wonder if some further evidence can be inferred from geological data besides O16/O18 measurements. I am very curious about the outcome...
Both Shaviv's and Melott's papers are based upon models of the Milky Way that are built from observations taken from a single point in the universe, and made during a negligible time frame. This model is then kept valid and unchanged for a timeframe of about 1.000.000.000 years, neglecting for example errors in measuring accelerations of the galaxy and of the solar system, the 3D structure of the galaxy, dark matter influence (and existence...) on the motion of the galaxy, etc. Still too much unknowns before reaching a definite answer, isn't it ?!?
Slashdot Mirror
> 1) Film type. What should I go with? I was thinking of a low-grain slow film like Reala, but would a faster film be preferable?
> 2) Shutter length. What is the minimum shutter length to get a deep view of the sky but also avoid capturing the rotation of the earth?
> 3) Lens. Is there an ideal focal length? I was thinking wider is better to capture more of the sky and possibly some earth-based objects
It is easy to estimate this. The sky (well...the Earth) rotates in about 24 hours: given the shutter length and the apparent distance of the stars from North (South if you live in the southern emisphere), you get the apparent rotation of your target. In order to avoid a blurred image, the apparent displacement must be smaller than the diameter of the circle of confusion of your lens, which also depends from the focal lenght of your lens and from the f/stop you use. Shutter lenght and f/stops are also related to the film sensitivity you use. Excel is your friend...
From my experience (I like taking landscape night shots) I start noticing blurred images of stars while shooting with an exposure time longer than about 10 seconds and a 50mm lens. If you need a longer exposure, consider using a polar mount and a motor for tracking stars. Before shooting, look around for incoming airplanes, Iridium flares, or other flying objects: they can ruin your shots...
Towards the end of the web page they say that they stitched all the images together using this software.
I personally use this free program for photo stitching, but if you look around with google, you can find plenty of them to use.
now I can go from start to BSOD in less than a minute.
> Dogs can't sniff them out
what if they use dogpile.com ?!?
...a USB 3.0 keyboard ?!? I hate typing so slowly.
Since Apollo expedition brought back petrified wood from the moon, water was abundant there many years ago.
for improving the quality of new hardware. Nowadays it seems a bit flimsy, isn't it ?!?
I too use NTFS on USB media. It works, it keeps track of acces permissions to files, and it can be easily shared with non-Linux users. As a second option I use the native FAT32 system used for pre-formatting USB drivers. I think that using Linux-native file system (like ext3) would make my USB driver too anti-social with respect to people with whom I share data, but I am not a technical geek.
In 1973 FIAT (the italian car company) put on the market this device (sorry guys, but it is in italian). There are still some cogenerators working around there, but from a commercial point of view it was near a failure. It will be interesting to see what happens to WV generator.
> The company says the consolidation, which physically separates Microsoft engineers from the servers running their test code
So, if engineers are fare away from the server running their test code, how do they press the reset button when the server shows the BSOD ?!?
one could be electrocuted while washing his hair in the sunshine!
people are neither competent, nor nice. Time to look for another job.
Some years ago I added a device like this to a BSD box that I used as a NFS server in my home network. There are several projects like this available in internet using different microcontrollers. Simply map the terminal push buttons to perform some useful commands (like starting a safe reboot script), and you have an emergency exit for your box. You might also try this: start a VNC server on your box at boot time, and set up as well a network connection using either the serial port or better a USB port (using usbnet). This should allow you to access the system X display through USB/serial. I am afraid however that there is not an easy solution for accessing remotely the BIOS screen before the OS starts.
ARRL also gave some notice about possible health risks related to ham radio activities. It seems that risks associated with strong RF fields should not be underestimated, indeed.
1) design SSDs with a longer lifespan
Maybe not: see for example this paper. Indirect observation of gravitational waves proves nothing. We shouldn't forget that aether was supposed to exist by indirect proof...
> You just need to find the group that is still willing to learn and find new innovative projects to work on.
Before quitting ham radio years ago I was developing by myself an innovative DSP device for radio work (it was a high performance RTX IF strip, partly hardware and partly software). It was something very different from what you see around now, since I used some methods that at that time were probably unknown to the ham radio community (although some work was being done about radio and DSP, but my approach was different). It suffices to say that some of the algorithms I developed at that time have been "rediscovered" by a major chip vendor last year: so I guess that what I was designing qualified as innovative.
My plans was to give around the plans for building it, as well as the executables: after all I was designing it for fun, and I hoped that somebody else could have fun playing with it and learning how it worked. Well, when the rumours about what I was developing started spreading around, I started receiving endless requests for a kit, possibly with all solder work done in advance (and no, I wasn't using SMD technology, so it was quite viable to everybody). Some Linux zaelots had nothing better to do that to scream that everything I did had to be put in the public domain (needless to say, they gave nil contribution to my work), and two people who were asked to do some beta-testing never had the time (or interest ?!?) to do it. I soon realized that nobody at all showed interest into learning what there was "under the hood", so I decided that it was better to give up. All I wanted was simply to have around people interested into learning and experimenting, (hoping as well to learn something from them and from their questions): for sure I did not want to start a Heathkit-like company.
Part of what I designed ended its life into an application for my employer: this gave me in return plenty of appreciation, a small career advancement, and no complaints at all. Then I started thinking about the meaning of "hobby"...and I quitted!
I had plenty of friends involved with ham radio and radio listening, who had in their homes several CFL bulbs. None of them ever reported interference coming from CFL lamps. The trouble is noth with CFL technology, but in the way some homes are wired.
Ham radio was the entry point to technology for me too, but I am probably younger than you (I am 47), and I soon realized that, after a few years with ham radio, there was nothing new to learn.
Radio amateurs here in my city were too interested into buying technology, rather than learning about it, so it was time to say goodbye. My job offered me much more opportunities to learn about new technologies (and, most important, to have an active part in them), and so I sold all my ham radio equipment.
Sometimes I think if I should go back to ham radio when I retire, but I always answer to myself a big "NO": things like digital photography and internet are cheaper, technologically more challenging, and much more socially shareable with other people than ham radio, so my choice is done.
I do not back up the idea of dropping ham radio for BPL, but I believe that the importance of this hobby as a way of self-learning should be quite reconsidered. Just my 0.02 USD...
> Samir, this is America. You can debate anything.
This does it mean that we can also collect signatures to abrogate Ohm's law ?!?
netcat.
google cache is here , but it seems slashdotted too.
Here you can find a brief description of the Milky Way structure. In the time frame of 1 Gy our solar system makes probably four revolutions around the center of our galaxy. I try to make an example about what is the problem with the theory related with TFA. Suppose you live in New York City: get out from your home, look carefully to people around you, then get into the underground. Make four trips all around the city, and go back home. Are the very same people you met before still all around you ?!? Some of your neighbours for sure, others don't, somebody who previously was hidden is now in sight of you, and somebody else died or emigrated elsewhere. Now you are the solar system: what if one of your neighbours is like this one ? And what about dark matter (if ever exists) ? My point is that to prove or disprove the theories from Shaviv or Mellot we need something better than a piece of paper with a sketch of our galaxy, and a sign showing "you are here". I wonder if some further evidence can be inferred from geological data besides O16/O18 measurements. I am very curious about the outcome...
Both Shaviv's and Melott's papers are based upon models of the Milky Way that are built from observations taken from a single point in the universe, and made during a negligible time frame. This model is then kept valid and unchanged for a timeframe of about 1.000.000.000 years, neglecting for example errors in measuring accelerations of the galaxy and of the solar system, the 3D structure of the galaxy, dark matter influence (and existence...) on the motion of the galaxy, etc. Still too much unknowns before reaching a definite answer, isn't it ?!?
This will terminate your code block.