You don't need or want a cell phone jammer in these situations.
A much better solution would be to set up a microcell in the area you intend to control. It could allow phone calls and data to pass through or not, depending on a white list.
For prisons, a microcell would provide important metadata about the phones being used inside. It could also allow prison officials to records cell phone conversations the same way they record wired-phone conversations. Why don't prisons want microcells instead of jammers? Jammers are far less expensive.
I don't know what they use in the real world, but I doubt they try to measure gravity. You can make gravitational maps of the Earth from an orbiting spacecraft, but that takes many many orbits and careful measurement of those orbits from the ground. An ICBM in flight simply wouldn't have the time to make such a map, and I doubt it would be communicating with ground stations either.
The Earth is "lumpy" from a gravitational perspective so it's plausible that a highly accurate ICBM might need to take precise gravitational maps into account. However, those maps would have to be created ahead of time and pre-programmed into the missile.
Scientists have created gravitational maps of the Earth and the moon, as well as other solar system bodies.
Low Earth orbital velocity is a little under 8 km/sec, so if you're moving faster than that, you're going to be spending a lot of fuel trying to stay down, close to the Earth. In other words, much of your thrust will be needed to add extra centripetal acceleration to supplement the pull of gravity.
Earth escape velocity is about 11.2 km/sec, so moving anywhere at 12 km/sec would put you at risk of never coming home again if something went wrong with your vehicle.
The amount of energy required to move at these speeds is huge, and would require tremendous amounts of fuel to achieve: note the size of a rocket necessary to accelerate a satellite up to orbital velocity. This hypersonic research is weapons related. The researchers are undoubtedly interested only in small payloads going at these speeds for very brief periods of time. One application might be getting a small warhead past a warship's defenses. Another application might be ICBM reentry.
The amazing part of this episode is that Twitter discovered the disgruntled employee's action and rectified it in 11 minutes.
How did they find out so quickly? Either the employee bragged or the action set off a trip wire, meaning that particular account was closely monitored by Twitter. I doubt that even the White House would be able to get Twitter to act so quickly once POTUS or his staff discovered that the account was broken.
I want one of the following predicted genetic modifications for pigs:
1. Create bacon that has omega-3 fatty acids so that it's actually good for you.
2. Modify the pigs to chew their cud so that the meat will be kosher.
"A panaflex had only one urge: getting the shot. It would do anything to get the shot–take a ride on a copter, dangle from a boom, go over a waterfall in a barrel. Its unblinking eye ogled everything, and when it was ready, it shot film. Somewhere in its innards guncotton and camphor and other unlikely substances came together under considerable pressure to form a continuous strip of celluloid. That strip was coated with photoreactive chemicals to produce a full-color negative. The strip moved behind the panaflex’s eye and was exposed in discrete frames by a muscle-and-bone pull-down and shutter mechanism Edison would have recognized."
But please use the more modern HC/HCT/etc. CMOS versions, and not the old TTL stuff. Your family/friends/neighbors will thank you when they hear less screaming from you tearing less of your hair out.
Those are for both safety and because of concerns of blurring the image.
Ferromagnetic materials can move under the the influence of a strong MRI magnetic, which is a safety concern. Any conductive material may cause local blurring of the resultant image. It is also possible that conductive materials can be heated by the process, which is a safety concern.
If you come in for an MRI and they discover that you have some implant with no documentation on MRI compatibility, unless it's a grave emergency, they're going to send you off for a CT. But feel free to argue with them.
That's all well and good if you are a cat, with a low payout to the owner in case of an accident. Thank you for your veterinary reference.
Whether implanted RFIDs are actually safe in MRI machines or not, human hospitals and imaging clinics are unlikely to take the risk and will send you for a CT instead. Perception of liability is more important than actual risk.
Have you ever had an MRI? Did you read the lengthy questionnaire first, with all the inquiries about metal implants, having worked in a machine shop, etc.? Do you remember getting wanded with a metal detector? MRI safety is serious business.
From Robert Heinlein's "Podkayne of Mars", published in 1962. Read all the way to the end.
'Venusberg assaults the eye and ear even from inside a taxi... full color and stereo ads climb right inside your taxi and sit in your lap and shout in your ear.
Don't ask me how this horrid illusion is produced. The engineer who invented it probably flew off on his own broom. This red devil about a meter high appeared between us and the partition separating us from the driver... and started jabbing at us with a pitchfork. "Get the Hi-Ho Habbit!", it shrieked. "Everyone drinks Hi-Ho! Soothing, Habit-Forming. Dee-lishus! Get High with Hi-Ho!"
I shrank back against the cushions.
Girdie phoned the driver. "Please shut that thing off."
It faded down to just a pink ghost and the commercial dropped to a whisper while the driver answered, "Can't madam. They rent the concession." Devil and noise came back on full blast.
And I learned something about tipping. Girdie took money from her purse, displayed one note. Nothing happened and she added a second; noise and image faded down again. She passed them through a slot to the driver and we weren't bothered any more. Oh, the transparent ghost of the red devil remained and a nagging whisper of his voice, until both were replaced by another ad just as faint -- but we could talk. The giant ads in the street outside were noisier and more dazzling; I didn't see how the driver could see or hear to drive, especially as traffic was unbelievably thick and heart-stoppingly fast and frantic, and he kept cutting in and out of lanes and up and down levels as if he were trying to beat Death to a hospital.
By the time we slammed to a stop on the roof of Dom Pedro Casino I figure Death wasn't more than half a lap behind.
I learned later why they drive like that. The hackie is an employee of the Corporation, like most everybody -- but he is an "enterprise-employee," not on wages. Each day he has to take in a certain amount in fares to "make his nut" -- the Corporation gets all of this. After he has rolled up that fixed number of paid kilometers, he splits the take with the Corporation on all other fares the rest of the day. So he drives like mad to pay off the nut as fast as possible and start making some money himself -- then keeps on driving fast because he's got to get his while the getting is good."
Net neutrality has nothing to do with different classes of service. If Comcast wants to offer a special class of service that has high-throughput and well-characterized latency, then there's no problem. That's no different than offering both high-speed fiber and slow dial-up service.
What net neutrality prevents is Comcast offering such a service, but then charging customers differently depending on where they want to send their packets.
Also, nothing would prevent Comcast from creating whatever restrictions they want on a private intranet. Just don't claim to customers that's it's part of the Internet.
> Ofcom and radio station officials believe the hacker is using a mobile radio transmitter to broadcast a stronger signal on the radio station's normal frequency, overriding its normal program.
Either this is the weakest commercial radio station in the world, or the "hacker" has access to a massive amplifier and antenna, or he's just overriding the station's frequency in a very small area. My money is on the last of those, and also that this story is of negligible significance.
Or perhaps the officials are wrong and the guy is overpowering a much weaker studio-to-transmitter link and using the station's own signal to broadcast his onanistic outrage.
Microsoft was not late to the market: they have been working on phones for a long time, and PDAs before that. Windows Mobile on phones predates both the iPhone and Android.
For whatever reason, Microsoft was just never able to get mobile right.
Of course he was going to ignore a warning that said, "Hold steering wheel."
Instead, the car should have said:
"What the hell are you doing with your hands off the wheel, you idiot???! Are you trying to crash? Do you want to die? Do you want to make your kids orphans?"
The warnings could get increasingly forceful as the car complains that its own safety is being jeopardized.
"I don't want to go to a body shop. They use hammers! Kill yourself if you want, but leave me out of it."
Air traffic control radar can't see airliners by itself at any reasonable distance. Planes are equipped with transponders that send out radio signals when the plane is "painted" by the ATC radar. If civilian radars can't see transponderless airliners, they will have no hope of seeing small drones.
Slashdot Mirror
You don't need or want a cell phone jammer in these situations.
A much better solution would be to set up a microcell in the area you intend to control. It could allow phone calls and data to pass through or not, depending on a white list.
For prisons, a microcell would provide important metadata about the phones being used inside. It could also allow prison officials to records cell phone conversations the same way they record wired-phone conversations. Why don't prisons want microcells instead of jammers? Jammers are far less expensive.
I don't know what they use in the real world, but I doubt they try to measure gravity. You can make gravitational maps of the Earth from an orbiting spacecraft, but that takes many many orbits and careful measurement of those orbits from the ground. An ICBM in flight simply wouldn't have the time to make such a map, and I doubt it would be communicating with ground stations either.
The Earth is "lumpy" from a gravitational perspective so it's plausible that a highly accurate ICBM might need to take precise gravitational maps into account. However, those maps would have to be created ahead of time and pre-programmed into the missile.
Scientists have created gravitational maps of the Earth and the moon, as well as other solar system bodies.
Low Earth orbital velocity is a little under 8 km/sec, so if you're moving faster than that, you're going to be spending a lot of fuel trying to stay down, close to the Earth. In other words, much of your thrust will be needed to add extra centripetal acceleration to supplement the pull of gravity. Earth escape velocity is about 11.2 km/sec, so moving anywhere at 12 km/sec would put you at risk of never coming home again if something went wrong with your vehicle. The amount of energy required to move at these speeds is huge, and would require tremendous amounts of fuel to achieve: note the size of a rocket necessary to accelerate a satellite up to orbital velocity. This hypersonic research is weapons related. The researchers are undoubtedly interested only in small payloads going at these speeds for very brief periods of time. One application might be getting a small warhead past a warship's defenses. Another application might be ICBM reentry.
The amazing part of this episode is that Twitter discovered the disgruntled employee's action and rectified it in 11 minutes. How did they find out so quickly? Either the employee bragged or the action set off a trip wire, meaning that particular account was closely monitored by Twitter. I doubt that even the White House would be able to get Twitter to act so quickly once POTUS or his staff discovered that the account was broken.
I want one of the following predicted genetic modifications for pigs: 1. Create bacon that has omega-3 fatty acids so that it's actually good for you. 2. Modify the pigs to chew their cud so that the meat will be kosher.
"A panaflex had only one urge: getting the shot. It would do anything to get the shot–take a ride on a copter, dangle from a boom, go over a waterfall in a barrel. Its unblinking eye ogled everything, and when it was ready, it shot film. Somewhere in its innards guncotton and camphor and other unlikely substances came together under considerable pressure to form a continuous strip of celluloid. That strip was coated with photoreactive chemicals to produce a full-color negative. The strip moved behind the panaflex’s eye and was exposed in discrete frames by a muscle-and-bone pull-down and shutter mechanism Edison would have recognized."
https://varley.net/excerpt/demon-coming-attractions/
https://learningtheartofelectr...
But please use the more modern HC/HCT/etc. CMOS versions, and not the old TTL stuff. Your family/friends/neighbors will thank you when they hear less screaming from you tearing less of your hair out.
Anyone who wants to tinker with hardware should buy a copy of Horowitz and Hill’s “The Art of Electronics”, now in its third edition.
https://www.amazon.com/Art-Ele...
It’s practical, understandable and will teach you how to build good, real world analog and digital circuits. Accept no substitutes!
Just because I buy and use something, doesn't make mean that I understand that thing or have any particular expertise or insight about it.
Kim Kardashian uses an iPhone, but I would not describe her as a high-tech individual.
Looks like the food in the UBS company cafeterias is too rich.
Portability. Think of C as a portable assembler.
Those are for both safety and because of concerns of blurring the image.
Ferromagnetic materials can move under the the influence of a strong MRI magnetic, which is a safety concern.
Any conductive material may cause local blurring of the resultant image. It is also possible that conductive materials can be heated by the process, which is a safety concern.
If you come in for an MRI and they discover that you have some implant with no documentation on MRI compatibility, unless it's a grave emergency, they're going to send you off for a CT. But feel free to argue with them.
That's all well and good if you are a cat, with a low payout to the owner in case of an accident. Thank you for your veterinary reference.
Whether implanted RFIDs are actually safe in MRI machines or not, human hospitals and imaging clinics are unlikely to take the risk and will send you for a CT instead. Perception of liability is more important than actual risk.
Have you ever had an MRI? Did you read the lengthy questionnaire first, with all the inquiries about metal implants, having worked in a machine shop, etc.? Do you remember getting wanded with a metal detector? MRI safety is serious business.
This will cut down on the company's health insurance premiums because the employees are no longer eligible for expensive MRIs.
From Robert Heinlein's "Podkayne of Mars", published in 1962. Read all the way to the end.
'Venusberg assaults the eye and ear even from inside a taxi... full color and stereo ads climb right inside your taxi and sit in your lap and shout in your ear.
Don't ask me how this horrid illusion is produced. The engineer who invented it probably flew off on his own broom. This red devil about a meter high appeared between us and the partition separating us from the driver... and started jabbing at us with a pitchfork. "Get the Hi-Ho Habbit!", it shrieked. "Everyone drinks Hi-Ho! Soothing, Habit-Forming. Dee-lishus! Get High with Hi-Ho!"
I shrank back against the cushions.
Girdie phoned the driver. "Please shut that thing off."
It faded down to just a pink ghost and the commercial dropped to a whisper while the driver answered, "Can't madam. They rent the concession." Devil and noise came back on full blast.
And I learned something about tipping. Girdie took money from her purse, displayed one note. Nothing happened and she added a second; noise and image faded down again. She passed them through a slot to the driver and we weren't bothered any more. Oh, the transparent ghost of the red devil remained and a nagging whisper of his voice, until both were replaced by another ad just as faint -- but we could talk. The giant ads in the street outside were noisier and more dazzling; I didn't see how the driver could see or hear to drive, especially as traffic was unbelievably thick and heart-stoppingly fast and frantic, and he kept cutting in and out of lanes and up and down levels as if he were trying to beat Death to a hospital.
By the time we slammed to a stop on the roof of Dom Pedro Casino I figure Death wasn't more than half a lap behind.
I learned later why they drive like that. The hackie is an employee of the Corporation, like most everybody -- but he is an "enterprise-employee," not on wages. Each day he has to take in a certain amount in fares to "make his nut" -- the Corporation gets all of this. After he has rolled up that fixed number of paid kilometers, he splits the take with the Corporation on all other fares the rest of the day. So he drives like mad to pay off the nut as fast as possible and start making some money himself -- then keeps on driving fast because he's got to get his while the getting is good."
Net neutrality has nothing to do with different classes of service. If Comcast wants to offer a special class of service that has high-throughput and well-characterized latency, then there's no problem. That's no different than offering both high-speed fiber and slow dial-up service.
What net neutrality prevents is Comcast offering such a service, but then charging customers differently depending on where they want to send their packets.
Also, nothing would prevent Comcast from creating whatever restrictions they want on a private intranet. Just don't claim to customers that's it's part of the Internet.
> Ofcom and radio station officials believe the hacker is using a mobile radio transmitter to broadcast a stronger signal on the radio station's normal frequency, overriding its normal program.
Either this is the weakest commercial radio station in the world, or the "hacker" has access to a massive amplifier and antenna, or he's just overriding the station's frequency in a very small area. My money is on the last of those, and also that this story is of negligible significance.
Or perhaps the officials are wrong and the guy is overpowering a much weaker studio-to-transmitter link and using the station's own signal to broadcast his onanistic outrage.
Microsoft was not late to the market: they have been working on phones for a long time, and PDAs before that. Windows Mobile on phones predates both the iPhone and Android.
For whatever reason, Microsoft was just never able to get mobile right.
And they haven't employed technical solutions to correct for typos and collect the correct data?
This doesn't sound right.
Yup, sounds like a command and control network.
Are all the hits to the main page, or are there also a bunch to the history, talk and talk-history pages?
Of course he was going to ignore a warning that said, "Hold steering wheel."
Instead, the car should have said:
"What the hell are you doing with your hands off the wheel, you idiot???! Are you trying to crash? Do you want to die? Do you want to make your kids orphans?"
The warnings could get increasingly forceful as the car complains that its own safety is being jeopardized.
"I don't want to go to a body shop. They use hammers! Kill yourself if you want, but leave me out of it."
The accident was therefore Tesla's fault.
Don't make your voice assistant mad. You won't like it when it's mad.
"Most Secret War" by R. V. Jones
https://www.amazon.com/Most-Se...
A story of doing vital technology on the time scales of total war. This book should be read by anyone who cares about practical innovation.
Air traffic control radar can't see airliners by itself at any reasonable distance. Planes are equipped with transponders that send out radio signals when the plane is "painted" by the ATC radar. If civilian radars can't see transponderless airliners, they will have no hope of seeing small drones.
Military radar is another matter.