NOR Flash is more resilient than ST-MRAM in two ways; it requires more than just a write enable line to write or overwrite data and NOR Flash is insensitive to magnetic fields.
I replaced my HP-48 with an HP-50g and have no complaints. It uses four AAA cells instead of three, has USB, a full sized SD card slot, and a user replaceable coin lithium cell for battery backup.
The tactile keyboard is a pretty close match as well.
Up until a recent lawsuit, Indiana suspended the driver's licenses of people who do not have insurance whether they were driving or owned a car or not.
My current system is AMD but only because at the time, pre-DDR3, it was much less expensive than an Intel system with ECC support. Now AMD lacks even that unless I stay with the Phenom II but by the time I need to build a new system, Intel may be the only option.
A nice side effect of the TCP/IP protocol is that they can use fiber optic connectors to isolate controllers electrically... which also cuts down on the weight of the vehicle as well. There certainly is no thick bus cable full of copper going the full length of the rocket, which is the case for legacy rockets.
If they are using wired ethernet for which there is already an avionics version, then galvanic isolation is already provided at both ends of each cable.
Uh, try reading the Forbes article cited by another commenter (I had read it back in the day, and just reread it now, amongst others).
LightSquared has been advertising some magical RF filter without identifying the price, power required, or form factor. If they have a working model, where is a picture of it? Has anybody independently measured or duplicated its performance?
The filter isn't all that difficult, regardless of power level. The GPS receivers are deliberately trying to receive out-of-band spectrum that was not licensed to them to compensate for their cheapness. Even Garmin and Trimble knew there were problems with their equipment and had been cautioning investors about the problem since 2001 (before LightSquared).
Power level is not a problem in this case but in the more general case it is. High Q filters by their very nature are susceptible to dielectric breakdown at high power levels where high power can be as low as 1/2 watt. In large ones at RF, you usually get a nice blue corona discharge around the tuning structures which may fail. Integrated filters just silently self destruct.
Consumer GPS receivers could have better RF filtering but there is no RF filter that can accomplish what LightSquared PR is advertising within the small form factors that are common today. All direct conversion based receivers have problems with front end selectivity leading to overload but better superheterodyne designs would be significantly larger and require more power.
What astonishes me is that people aren't installing more of these Philips lightsâ"they are amazing. You can't tell the difference between them and incandescents, but they last forever, use minimal power, and look _really_ cool (but don't look at them when they're onâ"they're _bright_!).
Unfortunately most electronic ballasts emit an incredible amount of conducted and radiated EMI so they are not universal substitutes for quiet incandescent lighting or even non-electronic ballasted fluorescent tubes.
Since Google removed items related to firearms from their shopping results, I have simply made it a habit to use another search service. Why should I get used to using two different search services for shopping when one will do?
When looking for non-firearm items, I am more likely to just skip Google now whether I start with Amazon or not.
It takes more than 10 minutes to receive the entire almanac but for operation only the ephemeris for the received satellites is necessary which takes up to 30 seconds. It takes longer for PDAs and phones A-GPS because of the abysmal performance of their GPS receivers.
Error correcting modems have transmit and receiver buffers that are not part of the UART. The USR Courier even had a setting to lower the buffer size and latency for better performance with short block protocols like xmodem.
Laser light is coherent (which has to do with waveform). That's its fundamental property. The fact that it comes out of most lasers already collimated to a great extent is just a bonus side-effect of the way those lasers are built.
But most lasers are only coherent for a distance of millimeters or less and they are used for their brightness and/or narrow bandwidth. They are useless for holography and interferometry.
There IS a word. Coherent. The fact that lasers are generally for the creation and use as coherent light sources is the cause of the confusion.
coherent != collimated
And most lasers are not even coherent in use. Holography and interferometry require coherence. Most laser applications just require either a bright source or a narrow spectrum but not coherence.
Professor Bernard Quatermass: The will to survive is an odd phenomenon. Roney, if we found out our own world was doomed, say by climatic changes, what would we do about it? Dr. Mathew Roney: Nothing, just go on squabbling like usual.
USA can live with 10 aircraft carriers, or perhaps 9
The savings from not having to maintain 1 (or 2) navy armada (aka carrier group) can easily be channeled to build a permanent American moon base
But we would still be continuously building carriers at a slow rate. Once we stop building carriers, the infrastructure will be put to other uses and institutional knowledge will quickly fade. We will still have the plans but will be back at the build the tools to build the carrier stage. The same thing applies to submarine construction.
Slashdot Mirror
NOR Flash is more resilient than ST-MRAM in two ways; it requires more than just a write enable line to write or overwrite data and NOR Flash is insensitive to magnetic fields.
I replaced my HP-48 with an HP-50g and have no complaints. It uses four AAA cells instead of three, has USB, a full sized SD card slot, and a user replaceable coin lithium cell for battery backup.
The tactile keyboard is a pretty close match as well.
Up until a recent lawsuit, Indiana suspended the driver's licenses of people who do not have insurance whether they were driving or owned a car or not.
http://www.courier-journal.com/article/20121105/NEWS02/311050071/4-000-Indiana-drivers-licenses-reinstated-proof-insurance-case?odyssey=tab|topnews|text|Home&nclick_check=1
Start off with soap and bandy.
http://en.wikipedia.org/wiki/Lest_Darkness_Fall
My current system is AMD but only because at the time, pre-DDR3, it was much less expensive than an Intel system with ECC support. Now AMD lacks even that unless I stay with the Phenom II but by the time I need to build a new system, Intel may be the only option.
If they are using wired ethernet for which there is already an avionics version, then galvanic isolation is already provided at both ends of each cable.
http://en.wikipedia.org/wiki/Avionics_Full-Duplex_Switched_Ethernet
LightSquared has been advertising some magical RF filter without identifying the price, power required, or form factor. If they have a working model, where is a picture of it? Has anybody independently measured or duplicated its performance?
Power level is not a problem in this case but in the more general case it is. High Q filters by their very nature are susceptible to dielectric breakdown at high power levels where high power can be as low as 1/2 watt. In large ones at RF, you usually get a nice blue corona discharge around the tuning structures which may fail. Integrated filters just silently self destruct.
Consumer GPS receivers could have better RF filtering but there is no RF filter that can accomplish what LightSquared PR is advertising within the small form factors that are common today. All direct conversion based receivers have problems with front end selectivity leading to overload but better superheterodyne designs would be significantly larger and require more power.
Unfortunately most electronic ballasts emit an incredible amount of conducted and radiated EMI so they are not universal substitutes for quiet incandescent lighting or even non-electronic ballasted fluorescent tubes.
Dirty power will do it. Incandescent lamps where I live in Missouri last about a year but electronic ballasted lamps last maybe 3 months.
Damnit camperdave, they are doctors, not engineers.
Since Google removed items related to firearms from their shopping results, I have simply made it a habit to use another search service. Why should I get used to using two different search services for shopping when one will do?
When looking for non-firearm items, I am more likely to just skip Google now whether I start with Amazon or not.
I always have difficulty reading through the descriptions of culture that I personally experienced knowing that it was all senselessly destroyed.
http://en.wikipedia.org/wiki/The_World_Next_Door
It takes more than 10 minutes to receive the entire almanac but for operation only the ephemeris for the received satellites is necessary which takes up to 30 seconds. It takes longer for PDAs and phones A-GPS because of the abysmal performance of their GPS receivers.
More likely because if that does happen, then there is no massacre and a civilian carrying a concealed weapon who stops a crime is hardly news worthy.
And most crimes stopped by concealed carry holders do not involve shooting which further lowers the news worthiness.
Error correcting modems have transmit and receiver buffers that are not part of the UART. The USR Courier even had a setting to lower the buffer size and latency for better performance with short block protocols like xmodem.
Incandescent bulbs here generally last 2 years. CFL and LED bulbs last half that because of our dirty power. Which is more economical in that case?
But most lasers are only coherent for a distance of millimeters or less and they are used for their brightness and/or narrow bandwidth. They are useless for holography and interferometry.
And most lasers are not even coherent in use. Holography and interferometry require coherence. Most laser applications just require either a bright source or a narrow spectrum but not coherence.
It is more of a guideline than a rule.
Professor Bernard Quatermass: The will to survive is an odd phenomenon. Roney, if we found out our own world was doomed, say by climatic changes, what would we do about it?
Dr. Mathew Roney: Nothing, just go on squabbling like usual.
Let me tell you about the time I connected the directional coupler backwards . . .
Hot fudge sundae falls on a Tuesday.
I have read that book. It did not turn out well for the LHC or the Axis.
One reason for the fees is that without ongoing activity, the state can consider the balance as abandoned and claim it for themselves.
But we would still be continuously building carriers at a slow rate. Once we stop building carriers, the infrastructure will be put to other uses and institutional knowledge will quickly fade. We will still have the plans but will be back at the build the tools to build the carrier stage. The same thing applies to submarine construction.