I wonder how much of the power capacity issues is due to Japan using a combination of 50Hz and 60Hz power preventing them from easily sending power between the two systems? Though I guess they could have a high voltage DC intertie betwen the two, so maybe it's not so significant after all.
Does anyone know why they haven't rectified (no pun intended, well ok, maybe a little) this situation years ago? Seems like there's lots of reasons for a country to have the same power standard.
I almost always buy digital except when the CD is cheaper
I don't understand... why would you buy an analogue copy in cases where the digital CD is cheaper? Hmm...
Sorry, I forgot how pedantic people can be here and are unable to determine meaning based on contextual clues -- I meant "I buy digital downloads except when..."
If you're going to bother acquiring and keeping the original CDs, chances are you're going to want to keep the original packaging, i.e. jewel cases, leaflets, et al. You're sure as hell not going to slap them on some crappy spindle.
I just moved my CDs into 3-ring binders along with the insert booklets. Each 3 ring binder holds around 50 CDs so I went from 250 disks to 5 easy-to-move binders that easily fit into a single cardboard box. I can't imagine that many people care about the jewelbox itself, just the paper inserts.
I still don't know why I hold onto the CDs though - I've ripped everything to digital (and not into to a lossless format, I went with 192kbs MP3). The only time I've even opened the CD binder in over a year is to add a new disk.
Anytime I buy something new, I almost always buy digital except when the CD is cheaper. (why does Amazon sell some CDs for $7.99 + free shipping while the digital download is $9.99!?) The studios should let them sell the digital download for no more than the price of the physical CD.
Dunno bout you , but id sure as hell like to totally make fun of those machines and the TSA boyos . Is there a paint . or something that will show up on their xray / scan machines that we could write subtle messages with right on our skin to let them know how we truly feel ? Ex writing on one's butt " Scan This ":)
We're supposed to believe that you'd be willing to paint "Up yours, TSA!" on your ass with lead paint, yet you post to Slashdot as an Anonymous Coward?
Take it to the scene? Are you talking about a car-wreck or a natural disaster? A large earthquake could have a 200 square mile "scene", and may involve emergency personnel from across the country, each with their own disparate radio system that doesn't interoperate with the local agencies. Even in my local area there are a number of non-interoperable EMS radio systems, complicating disaster communications.
How do I know this? Local ARES meetings where the hams meet with local agencies to help define and coordinate their roles. Many of the members work for EMS services as EMT's, firemen, dispatches, etc. It seems that emergency service providers in my area don't reject volunteer disaster communications help - perhaps the thought of hundreds of thousands of people without power and fresh water (many of them suddenly homeless with no where to go) makes EMS providers think that just because their firetrucks can talk to each other, there might be other disaster communication needs. Only 30% of my department's firefighters even live in my city, so there won't be much immediate help to supplement on-duty firefighters, there may be less than 600 firefighters on-hand to support 700,000 citizens (and another few hundred thousand commuter workers trapped in the city).
Rather than badmouthing those that try to help, why not put them to work - organize meetings and find ways that they can help cover gaps in your communication. If power is out, cell towers are down, how will someone in a remote area let you know he needs help? If you think hams get in your way in a disaster, wait until disaster victims crowd your fire station trying to get health and welfare information for them and their family members.
Even my NERT training talked about the role that hams can play in a large disaster. EMS can't be everywhere, and when normal communication channels are down, the average citizen needs some way to contact EMS when there's a problem. (though my city is unique in that there are still old-fashioned fire department call boxes on many street corners)
Well, Satellite communications can also operate without the grid. And the EMS communication systems will have generator backed up systems that will also keep running... as long as there's no physical damage and as long as they can keep fuel to the generators during a prolonged disaster but hams have the same constraints with power.
Screw your "Red Dawn" scenario roleplay bullshit, I have REAL emergencies to attend to, where people REALLY die when things fuck up.
I thought that was why hams worked with the Red Cross for non-emergecny health and welfare communications. The EMS guys are busy looking for bodies to save and don't really care if Aunt Betty wants to tell her family that she's in a shelter and is ok. Even digital trunking radios have capacity limitations, so wouldn't you rather have non-essential communications going out over a separate radio network?
The hams know much more about signal propagation and antenna design than any EMS worker ever needs to know. If the earthquake takes out your repeater tower, you're going to be begging the hams to get communication out over HF since your nice digital trunking handheld wont reach around the corner without the repeater.
While not a disaster (usually!), I sometimes participate in athletic events that span large rural areas that have spotty or nonexistent cell phone coverage.
The ham radio guys step in to provide communications support and help coordinate emergency assistance when needed.
It's water vapor -- I gave you all of my work above, including the ideal gas formula, just so people could point out flaws in my calculations - feel free to point out the flaws (I know there are some), but don't say "Oh, that doesn't; make sense, a 1kg of water vapor shouldn't take up more than a liter of volume".
Not being able to reconcile log files hardly seems like a show-stopper.
I was pointing out that local clocks drift quite quickly unless you use a high quality local time source.
But in any case, clock skew between servers is actually a serious problem when you have a regulatory requirement to consolidate log files to accurately track user activity. Having someone perform some action *before* their login timestamp is not supposed to happen and shows that our controls and monitoring are not compliant...
It's also a problem when you're dealing with multiple DVR's that record security video for a facility - trying to view suspicious activity across hundreds of cameras is much harder when those camera images aren't all timestamped consistently so you have to broaden the time period your searcing on. There's also a credibility issue if using the security footage as evidence.
What? Nobody's talking about forced condensing... you just have to capture the vapor and wait until nightfall, when it gets cold.
But where are you going to store all of this vapor while you wait for nightfall?
3MW = 10M BTU/hr (http://convert-to.com/conversion/power/convert-mw-to-btu-per-hr.html) 890 BTU/lb of water = 1900 BTU/kg (http://en.wikipedia.org/wiki/Evaporative_cooler#Physical_principles)
10M BTU/hr * 12 hours / 1900 BTU/kg = 63157 kg of water (16,000 gal)
pV=nRT
Assuming you don't compress the resulting vapor (which takes energy):
p = 1 atm n = 63157000 g / 18g/mole = 3500000 moles R=.082 atm*L/mole*K T = 50 C + 273 = 323 K
V = nRT/p = 92 mllion L or 92 thousand cubic meters
Or a 3 story building that is about 100 meters on each side. please check my math, I did this in a hurry.
Whoops, just noticed that it was a 30MW datacenter, so multiply my numbers by 10 - so you need a 30 story building 100 meters on each side. Each floor of this containment building if it had floors) contains more floor space than the 100,000 square feet of the datacenter itself.
And this is assuming that you only need to accumulate 12 hours of vapor until nightfall lets you condense it, and that your night-time temperatures condense 100% of the vapor.
All these systems should have a decent local clock to fall back on. Calibrate a local clock based using gps, and they'll be able to go for a long time before degrading significantly.
That depends on the price of your local clock, and your definitions of "long time" and "degradation". Some of these applications need millisecond or better clock accuracy, and without an expensive temperature controlled clock they can't maintain that accuracy for long. Which is why they used GPS clocks in the first place - they get accuracy close to an atomic clock for very little cost.
When my NTP server was down for a week, the 100 servers that I managed were already off by plus or minus a few seconds in a week, which makes it hard to reconcile log files. If they were in remote sites without good network connectivity, a GPS time source sounds ideal.
I didn't Google any link, I looked it up the largest American dictionary. If you want to say "Well, that's not true in the U..K.", then that may be a valid point, but that's not what you said.
Perhaps you'd like the Wikipedia definition better:
GPS: The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that...
GNSS: Global navigation satellite systems (GNSS) is the standard generic term for satellite navigation systems ("sat nav") that provide autonomous geo-spatial positioning with global coverage.
Or, to paraphrase: GPS is a GNSS, GNSS is a "sat nav", therefore GPS is a "sat nav".
If you really want to be pendantic, then wouldn't it be more correct to say that GPS is a system of orbiting satellites and controlling ground station that provide positioning information to receivers on the ground? Therefore, GPS doesn't provide your position, it's your GPS receiver that provides your position? After all, not all GPS receivers provide your position, some only provide a time signal.
Which is why the parent poster was proposing an *open* solution - you pass the water through the facility once, then you send it to whoever wants to use luke-warm water and would have used large quantities of water anyway. Maybe a large laundry facility, chemical processing plant, etc.
It could be used for heating in the winter if there are nearby buildings that need to be heated, but the low temperature of the water (probably 130 degrees or less) means that it would take large pipes and a lot of energy from pumps to push it any significant distance. And, depending on the climate, it may only be useful for half the year.
While it's technically possible to recover the water, If they're going to recondense the vapor back to water anyway then they wouldn't need fresh water from the city, it could be a closed cycle. But this would significantly increase their energy costs which is why they want to use water cooling in the first place.
No it's not. And your link does not back you up. GPS just gives you a position on planet earth - Latitude, longitude and possibly elevation. Satnav adds navigation (i.e. maps and routing) to the functionality.
I don't know if you happened to read the definition I provided, but it does include navigation:
a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface
Tell me again what the difference is between "GPS just gives you a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface" and what you just said: "a position on planet earth [from satellites] plus navigation (i.e. maps and routing)"
Is navigational system different than navigation?
Perhaps English is not your native language, m-w.com also gives a definition for English learners:
http://www.learnersdictionary.com/search/GPS
a radio system that uses signals from satellites to tell you where you are and to give you directions to other places
Or maybe your dispute is with the dictionary definition of GPS? That's a valid dispute as I don't believe m-w is the reference standard for English language.
Star charts? Oh, and a timepiece (your average spring-driven wristwatch will do, I can shoot noon with the sextant to keep it accurate)? I've got a slide-rule, if that helps with the math and trig.
Perhaps you're jesting, but it seems that with modern imaging and computer technology, it'd be possible to take a snapshot of the night sky and as long as the stars are not completely obscured by clouds, it'd be possible to get a pretty accurate idea of where you are. Maybe you could even get a good fix with an accurate clock and the position of the sun in the sky?
In the SUV, Nattrass found Sanchez’s lifeless 6-year-old son Carlos on the front seat. “She told me they walked 10 miles but couldn’t find any help (and)... had run out of water and had been drinking their own urine,” Nattrass wrote.
“She turned down a wrong road,” Nattrass said in a recent interview. “She said she was following her GPS unit.” ...
Critical infrastructure could just use a more sensitive and precise antenna.
It's difficult to create an antenna that has good gain straight up and to the horizons (where you find GPS satellites), and no gain at all to terrestrial sources (which could be in a nearby tree or hill that's above the horizon line). At ground level, a GPS signal has a strength of 1 x 10^–16 watts - a 100W (or 10W or even 1W) transmitter a short distance away can easily mask that signal.
I'm not sure what in the grid would require synchronizing based on GPS. It's not like the stations and control centers ever move.
GPS isn't used just for positioning, but also as a "reliable", highly accurate time source.
A satnav (which is what you mean, not GPS) safely gives you navigational information whilst driving. A map doesn't unless you have a passenger. You have to stop to safely use a paper map. And that's a problem on a motorway.
a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface; also : the radio receiver so used
I very often need to have 2-3 people in the loop in addition to myself, I use "Reply to all" all the time. The problem is when you are on a huge mailing list like "Everyone in the company" and people use reply to all.
The solution to that is to limit who can send email to that "Everyone in the company" mailling list - often, only a few users need to be able to send mail to those huge mailing lists, no need to open it up to everyone in the company.
As reply-all is something that should only rarely be used...
"I don't use it" doesn't mean "other people don't use it". I'd actually say that half the emails I send are reply all.
Agreed, I make regular use of reply-all - great for keeping everyone on the team in the loop, especially when they are traveling and don't have regular access to the Sharepoint (yuck) team site.
Anytime I send something and I want to be careful that only one recipient gets it, I always use forward, that way I'm less likely to make the reply-all mistake.
Has worked for me so far and I don't have to hide the reply-all button.
A cell site of any decent capacity and transmitter power is going to cost $50 - $100K, not a "couple of thousand". And you better hope people that want to use it are close to the mountaintop since GSM is limited to around 25 miles from the cell site. CDMA doesn't have a hard limit, though you've still got a problem with receiving the signal from a cell phone transmitting at less than 1 watt (typically with a very low gain antenna) - max range is probably not much more than 30 miles even if you have clear line of sight.
Did you see how I put a link to the letter I was referring to so everyone can read it and formulate their own opinion? Do you think perhaps you could do the same for the sources you're referring to? It adds a lot of credence to your argument.
I'm afraid I don't have much confidence in the study from the inventor (who is for obvious reasons, biased), but would certainly be interested in seeing the John Hopkins reports you mentioned. Here's what I found out about the John Hopkins reports from a quick google search, I welcome links to the full reports:
(the Stroud referenced in the article is one of the author's of the paper I linked to above)
...
But what Stroud calls key data in the Johns Hopkins assessment is being withheld from the public. Literally blacked out.” The document is heavily redacted,” says a troubled Stroud.But what Stroud calls key data in the Johns Hopkins assessment is being withheld from the public. Literally blacked out.” The document is heavily redacted,” says a troubled Stroud.
...
The radiation safety evaluation was not conducted at the Johns Hopkins Lab in Baltimore, Maryland. The report admits “a spare system was not available to facilitate this.” Instead, it was tested at the manufacturer’s lab in California. The test was not performed on the exact configuration of the system in place in America’s airports.
...
Who at Johns Hopkins stands behind the study? “There are no names on the document to say who actually wrote this document and who is responsible,” says Stroud.
...
The I-Team has tried to find out but the University will not reveal their names. But a spokeswoman did tell Gillen that the scope of the study has been misinterpreted – including by the government – that Johns Hopkins had not been asked to prove the safety of the scanners and it did not prove the scanners are safe.
So it looks like this John Hopkins study (maybe there was more than one study?) was conducted by anonymous John Hopkins researchers, had much of the data redacted, the study was conducted on a company owned model that may or may not be the same as what's been deployed in the field, and a John Hopkins spokesman says that the study was not intended to, nor does prove that the scanners are safe.
Slashdot Mirror
I wonder how much of the power capacity issues is due to Japan using a combination of 50Hz and 60Hz power preventing them from easily sending power between the two systems? Though I guess they could have a high voltage DC intertie betwen the two, so maybe it's not so significant after all.
Does anyone know why they haven't rectified (no pun intended, well ok, maybe a little) this situation years ago? Seems like there's lots of reasons for a country to have the same power standard.
I almost always buy digital except when the CD is cheaper
I don't understand... why would you buy an analogue copy in cases where the digital CD is cheaper? Hmm...
Sorry, I forgot how pedantic people can be here and are unable to determine meaning based on contextual clues -- I meant "I buy digital downloads except when..."
If you're going to bother acquiring and keeping the original CDs, chances are you're going to want to keep the original packaging, i.e. jewel cases, leaflets, et al. You're sure as hell not going to slap them on some crappy spindle.
I just moved my CDs into 3-ring binders along with the insert booklets. Each 3 ring binder holds around 50 CDs so I went from 250 disks to 5 easy-to-move binders that easily fit into a single cardboard box. I can't imagine that many people care about the jewelbox itself, just the paper inserts.
I still don't know why I hold onto the CDs though - I've ripped everything to digital (and not into to a lossless format, I went with 192kbs MP3). The only time I've even opened the CD binder in over a year is to add a new disk.
Anytime I buy something new, I almost always buy digital except when the CD is cheaper. (why does Amazon sell some CDs for $7.99 + free shipping while the digital download is $9.99!?) The studios should let them sell the digital download for no more than the price of the physical CD.
Dunno bout you , but id sure as hell like to totally make fun of those machines and the TSA boyos . :)
Is there a paint . or something that will show up on their xray / scan machines that we could write subtle messages with right on our skin to let them know how we truly feel ? Ex writing on one's butt " Scan This "
We're supposed to believe that you'd be willing to paint "Up yours, TSA!" on your ass with lead paint, yet you post to Slashdot as an Anonymous Coward?
Take it to the scene? Are you talking about a car-wreck or a natural disaster? A large earthquake could have a 200 square mile "scene", and may involve emergency personnel from across the country, each with their own disparate radio system that doesn't interoperate with the local agencies. Even in my local area there are a number of non-interoperable EMS radio systems, complicating disaster communications.
How do I know this? Local ARES meetings where the hams meet with local agencies to help define and coordinate their roles. Many of the members work for EMS services as EMT's, firemen, dispatches, etc. It seems that emergency service providers in my area don't reject volunteer disaster communications help - perhaps the thought of hundreds of thousands of people without power and fresh water (many of them suddenly homeless with no where to go) makes EMS providers think that just because their firetrucks can talk to each other, there might be other disaster communication needs. Only 30% of my department's firefighters even live in my city, so there won't be much immediate help to supplement on-duty firefighters, there may be less than 600 firefighters on-hand to support 700,000 citizens (and another few hundred thousand commuter workers trapped in the city).
Rather than badmouthing those that try to help, why not put them to work - organize meetings and find ways that they can help cover gaps in your communication. If power is out, cell towers are down, how will someone in a remote area let you know he needs help? If you think hams get in your way in a disaster, wait until disaster victims crowd your fire station trying to get health and welfare information for them and their family members.
Even my NERT training talked about the role that hams can play in a large disaster. EMS can't be everywhere, and when normal communication channels are down, the average citizen needs some way to contact EMS when there's a problem. (though my city is unique in that there are still old-fashioned fire department call boxes on many street corners)
Well, Satellite communications can also operate without the grid. And the EMS communication systems will have generator backed up systems that will also keep running... as long as there's no physical damage and as long as they can keep fuel to the generators during a prolonged disaster but hams have the same constraints with power.
Screw your "Red Dawn" scenario roleplay bullshit, I have REAL emergencies to attend to, where people REALLY die when things fuck up.
I thought that was why hams worked with the Red Cross for non-emergecny health and welfare communications. The EMS guys are busy looking for bodies to save and don't really care if Aunt Betty wants to tell her family that she's in a shelter and is ok. Even digital trunking radios have capacity limitations, so wouldn't you rather have non-essential communications going out over a separate radio network?
The hams know much more about signal propagation and antenna design than any EMS worker ever needs to know. If the earthquake takes out your repeater tower, you're going to be begging the hams to get communication out over HF since your nice digital trunking handheld wont reach around the corner without the repeater.
While not a disaster (usually!), I sometimes participate in athletic events that span large rural areas that have spotty or nonexistent cell phone coverage.
The ham radio guys step in to provide communications support and help coordinate emergency assistance when needed.
Here's a few of those events:
http://www.therelay.com/re_credits.htm
http://tahoeamateurradio.com/dethride.htm
http://hoodtocoast.com/
It's water vapor -- I gave you all of my work above, including the ideal gas formula, just so people could point out flaws in my calculations - feel free to point out the flaws (I know there are some), but don't say "Oh, that doesn't; make sense, a 1kg of water vapor shouldn't take up more than a liter of volume".
Not being able to reconcile log files hardly seems like a show-stopper.
I was pointing out that local clocks drift quite quickly unless you use a high quality local time source.
But in any case, clock skew between servers is actually a serious problem when you have a regulatory requirement to consolidate log files to accurately track user activity. Having someone perform some action *before* their login timestamp is not supposed to happen and shows that our controls and monitoring are not compliant...
It's also a problem when you're dealing with multiple DVR's that record security video for a facility - trying to view suspicious activity across hundreds of cameras is much harder when those camera images aren't all timestamped consistently so you have to broaden the time period your searcing on. There's also a credibility issue if using the security footage as evidence.
What? Nobody's talking about forced condensing... you just have to capture the vapor and wait until nightfall, when it gets cold.
But where are you going to store all of this vapor while you wait for nightfall?
3MW = 10M BTU/hr (http://convert-to.com/conversion/power/convert-mw-to-btu-per-hr.html)
890 BTU/lb of water = 1900 BTU/kg (http://en.wikipedia.org/wiki/Evaporative_cooler#Physical_principles)
10M BTU/hr * 12 hours / 1900 BTU/kg = 63157 kg of water (16,000 gal)
pV=nRT
Assuming you don't compress the resulting vapor (which takes energy):
p = 1 atm
n = 63157000 g / 18g/mole = 3500000 moles
R=.082 atm*L/mole*K
T = 50 C + 273 = 323 K
V = nRT/p = 92 mllion L or 92 thousand cubic meters
Or a 3 story building that is about 100 meters on each side. please check my math, I did this in a hurry.
Whoops, just noticed that it was a 30MW datacenter, so multiply my numbers by 10 - so you need a 30 story building 100 meters on each side. Each floor of this containment building if it had floors) contains more floor space than the 100,000 square feet of the datacenter itself.
And this is assuming that you only need to accumulate 12 hours of vapor until nightfall lets you condense it, and that your night-time temperatures condense 100% of the vapor.
Are you sure it's practical to do this?
All these systems should have a decent local clock to fall back on. Calibrate a local clock based using gps, and they'll be able to go for a long time before degrading significantly.
That depends on the price of your local clock, and your definitions of "long time" and "degradation". Some of these applications need millisecond or better clock accuracy, and without an expensive temperature controlled clock they can't maintain that accuracy for long. Which is why they used GPS clocks in the first place - they get accuracy close to an atomic clock for very little cost.
When my NTP server was down for a week, the 100 servers that I managed were already off by plus or minus a few seconds in a week, which makes it hard to reconcile log files. If they were in remote sites without good network connectivity, a GPS time source sounds ideal.
I didn't Google any link, I looked it up the largest American dictionary. If you want to say "Well, that's not true in the U..K.", then that may be a valid point, but that's not what you said.
Perhaps you'd like the Wikipedia definition better:
GPS: The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that ...
GNSS: Global navigation satellite systems (GNSS) is the standard generic term for satellite navigation systems ("sat nav") that provide autonomous geo-spatial positioning with global coverage.
Or, to paraphrase: GPS is a GNSS, GNSS is a "sat nav", therefore GPS is a "sat nav".
If you really want to be pendantic, then wouldn't it be more correct to say that GPS is a system of orbiting satellites and controlling ground station that provide positioning information to receivers on the ground? Therefore, GPS doesn't provide your position, it's your GPS receiver that provides your position? After all, not all GPS receivers provide your position, some only provide a time signal.
Which is why the parent poster was proposing an *open* solution - you pass the water through the facility once, then you send it to whoever wants to use luke-warm water and would have used large quantities of water anyway. Maybe a large laundry facility, chemical processing plant, etc.
It could be used for heating in the winter if there are nearby buildings that need to be heated, but the low temperature of the water (probably 130 degrees or less) means that it would take large pipes and a lot of energy from pumps to push it any significant distance. And, depending on the climate, it may only be useful for half the year.
While it's technically possible to recover the water, If they're going to recondense the vapor back to water anyway then they wouldn't need fresh water from the city, it could be a closed cycle. But this would significantly increase their energy costs which is why they want to use water cooling in the first place.
No it's not. And your link does not back you up. GPS just gives you a position on planet earth - Latitude, longitude and possibly elevation. Satnav adds navigation (i.e. maps and routing) to the functionality.
I don't know if you happened to read the definition I provided, but it does include navigation:
a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface
Tell me again what the difference is between "GPS just gives you a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface" and what you just said: "a position on planet earth [from satellites] plus navigation (i.e. maps and routing)"
Is navigational system different than navigation?
Perhaps English is not your native language, m-w.com also gives a definition for English learners:
http://www.learnersdictionary.com/search/GPS
a radio system that uses signals from satellites to tell you where you are and to give you directions to other places
Or maybe your dispute is with the dictionary definition of GPS? That's a valid dispute as I don't believe m-w is the reference standard for English language.
Star charts? Oh, and a timepiece (your average spring-driven wristwatch will do, I can shoot noon with the sextant to keep it accurate)?
I've got a slide-rule, if that helps with the math and trig.
Perhaps you're jesting, but it seems that with modern imaging and computer technology, it'd be possible to take a snapshot of the night sky and as long as the stars are not completely obscured by clouds, it'd be possible to get a pretty accurate idea of where you are. Maybe you could even get a good fix with an accurate clock and the position of the sun in the sky?
Citation? If you're hiking in Death Valley it's hard not to know it. It's in a HUGE park. If you're driving into DV, there are plenty of warnings.
Yes, people die in DV; but it's not because they don't know where they are. It's usually because they underestimate what it can do to you.
Citation:
http://www.vvdailypress.com/articles/death-26078-valley-becoming.html ...
In the SUV, Nattrass found Sanchez’s lifeless 6-year-old son Carlos on the front seat. “She told me they walked 10 miles but couldn’t find any help (and) ... had run out of water and had been drinking their own urine,” Nattrass wrote.
“She turned down a wrong road,” Nattrass said in a recent interview. “She said she was following her GPS unit.”
...
Critical infrastructure could just use a more sensitive and precise antenna.
It's difficult to create an antenna that has good gain straight up and to the horizons (where you find GPS satellites), and no gain at all to terrestrial sources (which could be in a nearby tree or hill that's above the horizon line). At ground level, a GPS signal has a strength of 1 x 10^–16 watts - a 100W (or 10W or even 1W) transmitter a short distance away can easily mask that signal.
I'm not sure what in the grid would require synchronizing based on GPS. It's not like the stations and control centers ever move.
GPS isn't used just for positioning, but also as a "reliable", highly accurate time source.
A satnav (which is what you mean, not GPS) safely gives you navigational information whilst driving. A map doesn't unless you have a passenger. You have to stop to safely use a paper map. And that's a problem on a motorway.
Satnav is just another way to say "GPS":
http://www.merriam-webster.com/dictionary/gps
a navigational system using satellite signals to fix the location of a radio receiver on or above the earth's surface; also : the radio receiver so used
I don't see why we ever upgraded from four course radios.
Those seem like a clever idea for the time.
I very often need to have 2-3 people in the loop in addition to myself, I use "Reply to all" all the time. The problem is when you are on a huge mailing list like "Everyone in the company" and people use reply to all.
The solution to that is to limit who can send email to that "Everyone in the company" mailling list - often, only a few users need to be able to send mail to those huge mailing lists, no need to open it up to everyone in the company.
As reply-all is something that should only rarely be used...
"I don't use it" doesn't mean "other people don't use it". I'd actually say that half the emails I send are reply all.
Agreed, I make regular use of reply-all - great for keeping everyone on the team in the loop, especially when they are traveling and don't have regular access to the Sharepoint (yuck) team site.
Anytime I send something and I want to be careful that only one recipient gets it, I always use forward, that way I'm less likely to make the reply-all mistake.
Has worked for me so far and I don't have to hide the reply-all button.
A cell site of any decent capacity and transmitter power is going to cost $50 - $100K, not a "couple of thousand". And you better hope people that want to use it are close to the mountaintop since GSM is limited to around 25 miles from the cell site. CDMA doesn't have a hard limit, though you've still got a problem with receiving the signal from a cell phone transmitting at less than 1 watt (typically with a very low gain antenna) - max range is probably not much more than 30 miles even if you have clear line of sight.
Did you see how I put a link to the letter I was referring to so everyone can read it and formulate their own opinion? Do you think perhaps you could do the same for the sources you're referring to? It adds a lot of credence to your argument.
I'm afraid I don't have much confidence in the study from the inventor (who is for obvious reasons, biased), but would certainly be interested in seeing the John Hopkins reports you mentioned. Here's what I found out about the John Hopkins reports from a quick google search, I welcome links to the full reports:
http://miami.cbslocal.com/2011/02/11/i-team-do-airport-x-ray-scanners-pose-a-risk-to-travelers/
(the Stroud referenced in the article is one of the author's of the paper I linked to above)
But what Stroud calls key data in the Johns Hopkins assessment is being withheld from the public. Literally blacked out.” The document is heavily redacted,” says a troubled Stroud.But what Stroud calls key data in the Johns Hopkins assessment is being withheld from the public. Literally blacked out.” The document is heavily redacted,” says a troubled Stroud.
The radiation safety evaluation was not conducted at the Johns Hopkins Lab in Baltimore, Maryland. The report admits “a spare system was not available to facilitate this.” Instead, it was tested at the manufacturer’s lab in California. The test was not performed on the exact configuration of the system in place in America’s airports.
Who at Johns Hopkins stands behind the study?
“There are no names on the document to say who actually wrote this document and who is responsible,” says Stroud.
The I-Team has tried to find out but the University will not reveal their names. But a spokeswoman did tell Gillen that the scope of the study has been misinterpreted – including by the government – that Johns Hopkins had not been asked to prove the safety of the scanners and it did not prove the scanners are safe.
So it looks like this John Hopkins study (maybe there was more than one study?) was conducted by anonymous John Hopkins researchers, had much of the data redacted, the study was conducted on a company owned model that may or may not be the same as what's been deployed in the field, and a John Hopkins spokesman says that the study was not intended to, nor does prove that the scanners are safe.