You could AC couple a carrier signal to the third rail. The main problem would probably be dealing with electrical noise. The power pickups for the subway cars generate a lot of sparks and electrical noise.
The best analogy that I can think of is a pencil and paper. The pencil is the recording head and the paper is the platter. The pencil has a mediocre eraser. Every time you record new information on the sheet of paper, you erase any previous writing, but you do a half-assed job of it. If you look closely, you can see previous characters that were written on the page and then erased.
With the right equipment, you can do something similar with magnetic media.
Degaussing to NSA standards is very hard with modern high-coercivity media. See the NSA Media Destruction Guidance web page. Physical destruction (furnace) is usually simpler.
You can, with the right equipment, detect local oscillator radiation from the receiver. This can tell you what station is being watched or listened to. This has been used by governments to find people who listen to subversive radio stations or who haven't paid their annual radio/television tax.
Re:This warning will be comfort to the Broadcaster
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The broadcasters may be happy with more advertising, but the advertisers, the ones who write the checks, are increasingly unhappy with buying time that is devalued by excessive amounts of advertising per hour. How can your message stand out when it is dumped into a long commercial break that alienates the viewer and has 10 other companies hawking their products?
It sounds similar to the economic model for game shows. Hire a host and some actors that are between "real" jobs, trade promotional blurbs for prizes, and build a set. The contestants are free.
Game shows used to be more popular, Some of them even ran during prime time on the major networks. Today there is even a cable channel devoted to game shows.
If you're bored, it can be interesting to watch really old game shows and try to figure out how the celebrities became celebrities. Many of them had real careers that were cut short by the fickleness of Hollywood or public taste.
It has one big advantage, noise. A friend owned a condo that had concrete floors and walls. You never heard your neighbors and you could listen to music as loud as you liked without fear of annoying your neighbors.
The last numbers that I saw, said that about 15% of American households relied exclusively on over-the-air broadcasting for their television reception. Even in households with cable or satellite, many have secondary sets that rely on over-the-air signals.
Depending on who you talk to, the price premium for adding an integrated ATSC receiver to a television set should be around $50-$100 for large production volumes, and will decrease over time. There will also be cheap set-top boxes for existing NTSC television sets, much like the DVB-T boxes that are being sold in Europe.
I love it how people can spray comments like "I love it how people can spray comments like "responsible for most of the advances in drive technology over the past 50 years" without ever doing any actual research on the subject." without ever doing any actual research on the subject.
Some of us do read books, and have been around long enough to have a good understanding of the history of computing.
For a summary of IBM's work in storage technology, see here.
It's going to take time. The first NTSC color television sets were very expensive (about $6000 in today's dollars), and sold in very small volumes. It took over ten years for color programming to become commonplace, and for color television prices to reach "affordable" levels.
Assuming that they don't get shot down in federal court, the FCC is forcing television manufacturers to include ATSC (digital) receivers in new television sets. This is the same tactic they used to mandate vendor support for the UHF television band, closed captioning, and the v-chip.
Receivers with screen sizes 36" and above -- 50% of a responsible party's units must include DTV tuners effective July 1, 2004; 100% of such units must include DTV tuners effective July 1, 2005;
Receivers with screen sizes 25" to 35" -- 50% of a responsible party's units must include DTV tuners effective July 1, 2005; 100% of such units must include DTV tuners effective July 1, 2006;
Receivers with screen sizes 13" to 24" -- 100% of all such units must include DTV tuners effective July 1, 2007;
TV Interface Devices (videocassette recorders (VCRs), digital versatile disk (DVD) players/recorders, etc.) that receive broadcast television signals -- 100% of all such units must include DTV tuners effective July 1, 2007.
Many broadcast stations are already transmitting a digital signal, although some are doing it at low-power. Increasing amounts of network programming are in HD. One of my local stations is making a big deal about being the first in their market to produce and transmit local news in HD.
This is the land of synthetic imitation cheese-like substances, manufactured in factories that most closely resemble an oil refinery. Who needs cows when you have chemical engineering?
Considering that Hitachi acquired IBM's hard disk drive operation, which is responsible for most of the advances in drive technology over the past 50 years, I think it's fair to consider them leaders in drive technology.
The problem is jurisdiction. It's a lot simpler to investigate and prosecute crimes when they happen within a single country. Police detectives can obtain warrants and subpoenas from a local judge. They don't have to deal with the State Department, another country's foreign ministry, and prosecutors and police who have their own priorities and may not care if some local boys rip off some foreigners. Extradition, even when there are treaties in place, is relatively rare. It is usually reserved for the most serious crimes, like first-degree murder. Many countries will not extradite their own citizens, as a matter of policy.
According to a story from the BBC, Labour politicians in Birmingham were caught engaging in massive and blatant vote fraud. Postal ballots were the tool used to perpetrate the fraud.
At least it proves that other democracies are not immune to the problems that afflict the U.S. election system. It used to be that you had to demonstrate a genuine need to get an absentee ballot. Election officials knew that they were prone to fraud and abuse. In the lemming-like stampede to make voting "easy" for those without a sense of civic duty, the doors were opened to election fraud on a massive scale.
I think it is mostly due to the poor heat transfer properties of the thinner atmosphere. The head may also be more susceptible to head crashes due to the smaller air cushion provided by the thinner atmosphere.
I read about this being a real problem at many of the new astronomical observatories that have been constructed at high altitudes.
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You could AC couple a carrier signal to the third rail. The main problem would probably be dealing with electrical noise. The power pickups for the subway cars generate a lot of sparks and electrical noise.
With the right equipment, you can do something similar with magnetic media.
Degaussing to NSA standards is very hard with modern high-coercivity media. See the NSA Media Destruction Guidance web page. Physical destruction (furnace) is usually simpler.
You can, with the right equipment, detect local oscillator radiation from the receiver. This can tell you what station is being watched or listened to. This has been used by governments to find people who listen to subversive radio stations or who haven't paid their annual radio/television tax.
The broadcasters may be happy with more advertising, but the advertisers, the ones who write the checks, are increasingly unhappy with buying time that is devalued by excessive amounts of advertising per hour. How can your message stand out when it is dumped into a long commercial break that alienates the viewer and has 10 other companies hawking their products?
Game shows used to be more popular, Some of them even ran during prime time on the major networks. Today there is even a cable channel devoted to game shows.
If you're bored, it can be interesting to watch really old game shows and try to figure out how the celebrities became celebrities. Many of them had real careers that were cut short by the fickleness of Hollywood or public taste.
NASA has done research into making construction materials from moon dust and rock. See here.
It has one big advantage, noise. A friend owned a condo that had concrete floors and walls. You never heard your neighbors and you could listen to music as loud as you liked without fear of annoying your neighbors.
Depending on who you talk to, the price premium for adding an integrated ATSC receiver to a television set should be around $50-$100 for large production volumes, and will decrease over time. There will also be cheap set-top boxes for existing NTSC television sets, much like the DVB-T boxes that are being sold in Europe.
Some of us do read books, and have been around long enough to have a good understanding of the history of computing. For a summary of IBM's work in storage technology, see here.
Assuming that they don't get shot down in federal court, the FCC is forcing television manufacturers to include ATSC (digital) receivers in new television sets. This is the same tactic they used to mandate vendor support for the UHF television band, closed captioning, and the v-chip.
Many broadcast stations are already transmitting a digital signal, although some are doing it at low-power. Increasing amounts of network programming are in HD. One of my local stations is making a big deal about being the first in their market to produce and transmit local news in HD.Eat Cheese or Die!
This is the land of synthetic imitation cheese-like substances, manufactured in factories that most closely resemble an oil refinery. Who needs cows when you have chemical engineering?
Considering that Hitachi acquired IBM's hard disk drive operation, which is responsible for most of the advances in drive technology over the past 50 years, I think it's fair to consider them leaders in drive technology.
It's usually defined as a crime with a maximum sentence of a year or more in prison.
Virginia abolished parole for felons who committed their offenses after 1994. Nine years is nine years.
The problem is jurisdiction. It's a lot simpler to investigate and prosecute crimes when they happen within a single country. Police detectives can obtain warrants and subpoenas from a local judge. They don't have to deal with the State Department, another country's foreign ministry, and prosecutors and police who have their own priorities and may not care if some local boys rip off some foreigners. Extradition, even when there are treaties in place, is relatively rare. It is usually reserved for the most serious crimes, like first-degree murder. Many countries will not extradite their own citizens, as a matter of policy.
Besides, are Indians too good to be thieves?
The batteries are made from baby seals, a renewable energy source.
The last time this happened (99 cents), they modified the old pumps to charge by the liter. No bargains for you!
They should send the responsible people to Iraq, and have them make a personal apology to every service member who didn't receive a proper ballot.
At least it proves that other democracies are not immune to the problems that afflict the U.S. election system. It used to be that you had to demonstrate a genuine need to get an absentee ballot. Election officials knew that they were prone to fraud and abuse. In the lemming-like stampede to make voting "easy" for those without a sense of civic duty, the doors were opened to election fraud on a massive scale.
Emergency escape rockets are only usable during a limited portion of the ascent profile. Like ejection seats, their usefulness is limited.
Corrosion (see electrochemistry).
I read about this being a real problem at many of the new astronomical observatories that have been constructed at high altitudes.