You're welcome. I realize that SCP != TCP with extensions - my comment about only having 25% utilization demonstrates, even with the largest TCP window, how non-useful TCP would be for deep space comms.
...the sun deposits about 4kw of raw energy on each square meter of most of this planet.
According to NASA, the clear day, directly overhead insolation rate is more like 1000 W/m2. Even the averaged satellite-measured top-of-the-atmosphere rate is only 1368 W/m2. 4KW after our sun goes nova perhaps, but not any time soon.
Newsflash - Every operating reactor in the world 'goes critical' every day, but do they tell the public this? NO!!!
Sarcasm aside, reactors go supercritical when increasing power output, subcritical when decreasing power output, and maintain criticality when running with constant power output. What you're (irrationally) afraid of is prompt criticality.
PS - Pre-change coins sound different than post-change coins when dropped on a hard surface such as a wooden table. The old coins 'ring', the new coins 'thud'.
The composition of the coin was changed again in 1962. Mint officials felt that deletion of the tin content would have no adverse effect on the wearing qualities of the coin, whereas, the manufacturing advantages to be gained with the alloy stabilized at 95 percent copper and 5 percent zinc would be of much benefit. Congressional authority for this modification is contained in an Act of Congress approved on September 5, 1962.
In 1982, the coin's composition changed again to copper-plated zinc. These coins, which are still being produced today, contain 97.6 percent zinc and 2.4 percent copper. This coin is identical in size and appearance to the predominantly copper cent issued before 1982, but this modification saves the Government an estimated $25 million in metal costs every year.
Substances present different levels of opacity based on wavelength. Our atmosphere is fairly transparent to the portion of it we detect with our eyes, but ishorriblyopaque at many other frequencies (like 24 and 60 GHz).
Many plastics that are visible light opaque serve happily as crystal-clear infrared lenses.
Isn't it a bit of a rash assumption that extra-terrestrial intelligence has technology anything like our own (regardless of how advanced or not it may be)?
I don't think so. Electromagnetic radiation is not a creation of man, it is a natural result of the way space/time is constructed. We just harness it for conveying information. Similarly there are naturallyoccurringmasers out in space.
As for you size argument, there are really no constraints (other than heat dissipation) on how small a transmitter can be - as the frequency goes up, the wavelength goes down. We build radio antennas many multiples larger than human size. A mouse-sized alien could construct a similarly scaled transmitter with considerable power output.
There is an RFC that addresses this, and support for it seems fairly well deployed (Linux kernel 2.4 had it but it was disabled, kernel 2.6 used a 2**7=128 scaling factor). The new option allows 1 GByte windows. Even with this RFC in place, you'd only get a 25% utilization between Earth and Mars (Send a GB, wait for 3GB's worth of send time).
I became aware of it having been recently bitten by a window scaling bug in a router between my PC and where I work. I found the RFC quite interesting.
Rightly so, since the first [A-Z]ASER produced microwaves, not visible light. [L|M]ASERs are all subsets of what should be called EASERs, (Electromagnetic Amplification... balh, blah).
...had what you're talking about. This was circa 1983. You could either look out of the windshield or straight down on the (very small, gridded) "world". I had a ball flying and dogfighting with that thing, green-screen and all.
Huygens has already "almostfailed". Some clever guy was analyzing the design of the radios, and found out that the data decoder was incapable of dealing with the doppler shift the probe was to encounter. They've since changed the trajectory of the mother ship to minimize the problem. The problem was caused by using a closed source radio system, and not detected because of limited testing, especially using 'real world' doppler-distorted signals.
The absolute best thing that could happen here would be for the judge to rule that the spammers get FIFTEEN YEARS IN PRISION (quietly, under breath: with possibility of parole in 6 months with good behaviour).
Virginia abolished parole a long time ago. You serve what you catch. I still agree with the 15 years.
Thanks for the info. I'm trying to jam a statically-linked gcj executable into an embedded device. When trying to compile a JNI-based open source jar into an object file, it's not always possible (license-wise) to go in and hack the code to suit my needs. Most JNI implementations call System.loadLibrary() to load the native half of their code, making it unusable in a statically-compiled executable. Someone suggested that GCJ support an option to specify what libraries are statically linked - this would help, but full static linking support would be better.
...compared to hsqldb for my purposes. Hsql supports persisting Java objects directly into an Object-type column [preparedStatement.setObject(obj)]. Derby requires that you persist your object manually and stuff it into a (statically-sized) BLOB by manipulating streams - ick!
Also, hsql allowed ps.setObject(1, null) as a shortcut to ps.setNull(1, Types.). This was really handy.
It _looks_ like derby 10 claims JDBC 2.0 support; shouldn't it have the OBJECT data type?
Slashdot Mirror
You're welcome. I realize that SCP != TCP with extensions - my comment about only having 25% utilization demonstrates, even with the largest TCP window, how non-useful TCP would be for deep space comms.
According to NASA, the clear day, directly overhead insolation rate is more like 1000 W/m2. Even the averaged satellite-measured top-of-the-atmosphere rate is only 1368 W/m2. 4KW after our sun goes nova perhaps, but not any time soon.
Newsflash - Every operating reactor in the world 'goes critical' every day, but do they tell the public this? NO!!!
Sarcasm aside, reactors go supercritical when increasing power output, subcritical when decreasing power output, and maintain criticality when running with constant power output. What you're (irrationally) afraid of is prompt criticality.
PS - Pre-change coins sound different than post-change coins when dropped on a hard surface such as a wooden table. The old coins 'ring', the new coins 'thud'.
Unless the metal composition of U.S. coins has changed since the early 80s...
Not to pick a nit, and not that it'd change the coin battery setup, but the metal composition of the 1 cent piece has changed since mid-1982.
From the US Treasury Website (emphasis mine):
The fact that humanity must be earned (ie, creatures that look human may not necessarily be human)
That's what the Bene Gesserit believe, remember?
Endian-ness and bit ordering are not related. Endian-ness only applies to how bytes are stored in a multibyte value.
MSB MSB-1 ... LSB+1 LSB is big endian.
LSB LSB+1 ... MSB-1 MSB is litle endian.
For bit ordering within a byte (left to right): ... 2^0=bit 0
2^n where n is the bit number is the 'normal' way
2^7=bit 7 2^6=bit 6
2^(n - 7) is the backward way ... 2^0=bit 7
2^7=bit 0 2^6=bit 1
Substances present different levels of opacity based on wavelength. Our atmosphere is fairly transparent to the portion of it we detect with our eyes, but is horribly opaque at many other frequencies (like 24 and 60 GHz).
Many plastics that are visible light opaque serve happily as crystal-clear infrared lenses.
Drat your hide, anonymous coward, I was going to make you a 'friend'. 8-)
Darn tootin' on your article. 73 de k4det
Isn't it a bit of a rash assumption that extra-terrestrial intelligence has technology anything like our own (regardless of how advanced or not it may be)?
I don't think so. Electromagnetic radiation is not a creation of man, it is a natural result of the way space/time is constructed. We just harness it for conveying information. Similarly there are naturally occurring masers out in space.
As for you size argument, there are really no constraints (other than heat dissipation) on how small a transmitter can be - as the frequency goes up, the wavelength goes down. We build radio antennas many multiples larger than human size. A mouse-sized alien could construct a similarly scaled transmitter with considerable power output.
There is an RFC that addresses this, and support for it seems fairly well deployed (Linux kernel 2.4 had it but it was disabled, kernel 2.6 used a 2**7=128 scaling factor). The new option allows 1 GByte windows. Even with this RFC in place, you'd only get a 25% utilization between Earth and Mars (Send a GB, wait for 3GB's worth of send time).
I became aware of it having been recently bitten by a window scaling bug in a router between my PC and where I work. I found the RFC quite interesting.
Rightly so, since the first [A-Z]ASER produced microwaves, not visible light. [L|M]ASERs are all subsets of what should be called EASERs, (Electromagnetic Amplification
It's all the same and should be called the same!
They already are all called the same - electromagnetic radiation. Light is a subset of EMR, not the other way around.
That'd be like saying that we should call all sound 'talking' or 'music'. All music and talking is sound, not the other way around.
Perhaps even more famous, Phil Karn, KA9Q.
...on reading "Pioneer Ultraviolet Laser" was "What? Neither Pioneer spacecraft carried a UV laser!" Sad indeed.
...had what you're talking about. This was circa 1983. You could either look out of the windshield or straight down on the (very small, gridded) "world". I had a ball flying and dogfighting with that thing, green-screen and all.
According to google:
1 slug = 14.5939029 kilograms
Huygens has already "almost failed". Some clever guy was analyzing the design of the radios, and found out that the data decoder was incapable of dealing with the doppler shift the probe was to encounter. They've since changed the trajectory of the mother ship to minimize the problem. The problem was caused by using a closed source radio system, and not detected because of limited testing, especially using 'real world' doppler-distorted signals.
After one or two years he'll be paroled to make room for someone else.
As I previously posted, Virginia abolished parole a long time ago.
The absolute best thing that could happen here would be for the judge to rule that the spammers get FIFTEEN YEARS IN PRISION (quietly, under breath: with possibility of parole in 6 months with good behaviour).
Virginia abolished parole a long time ago. You serve what you catch. I still agree with the 15 years.
Google for Tetrachromat.
(Sounds like a type of Kodak film, doesn't it?)
What is the cost of an early release?
The respect of your girlfriend?
Thanks for the info. I'm trying to jam a statically-linked gcj executable into an embedded device. When trying to compile a JNI-based open source jar into an object file, it's not always possible (license-wise) to go in and hack the code to suit my needs. Most JNI implementations call System.loadLibrary() to load the native half of their code, making it unusable in a statically-compiled executable. Someone suggested that GCJ support an option to specify what libraries are statically linked - this would help, but full static linking support would be better.
...compared to hsqldb for my purposes. Hsql supports persisting Java objects directly into an Object-type column [preparedStatement.setObject(obj)]. Derby requires that you persist your object manually and stuff it into a (statically-sized) BLOB by manipulating streams - ick!
Also, hsql allowed ps.setObject(1, null) as a shortcut to ps.setNull(1, Types.). This was really handy.
It _looks_ like derby 10 claims JDBC 2.0 support; shouldn't it have the OBJECT data type?