The present CDs are very close to 1.1 mm thick, although I do have one that is close to 1.5-mm thick.
THe diameter of a thick black hair is about 0.11-mm and that of a blond (natural) is about 0.08-mm. When I pick up a (0.12 x 0.050)-mm particle (I work with those) I cannot tell which side of the tweezers if sticks to, and my tweezers are needle sharp.
Last year my 30 year old daughter informed me of how much data a 7th grade student could put on the six sides of a new yellow pencil. From a few feet away it looks like it has been chewed on so the teacher asks no questions. Use only three sides and it even stays hidden when you put the pencil down.
If IBM had been able to use this technology, no telling how much data they could have put on paper disks! About 2 gigs along the edge even.
1.) Is there a uniform standard for what data and how many seconds of time is allowed to be kept in the auto's black box?
2.) How is the accuracy insured? Can someone run into a kid and the black box show that they were only going 25 mph when they were actually going 50?
The SRS (safety restraining system)is checked each time I start the engine, but that is only a processor and sensor-OK test. If the airbag does not employ properly or rapidly, does the black box still say it was ok when I started?
(OK, three things.)
Yes!. It's not redundant, and the writer wrote it once to tell what the Feds were doing and again to EMPHASIZE that it is identical to what some states were already implementing.
For many user's, the real security is whatever the programmer can manage to put into the install as a default. Yesterday I helped an lady, age 55-60, with her PC. She had purchased McAfee's (download) antivirus upgrade and did not know how to install it onto her computer. It turned out that McAfee's Firewall, not the antivirus, trial had ended, and she had followed the "buy it now" link (she thought), but somehow managed to purchase "SecureIE". This lady's main security is that I set her computer to use Mozilla email in order to avoid MSOutlook. She doesn't even use IE, and has no idea of what the word "Browser" means.
My point is that for most older, and many young users, PC security is no more than is built-in by the programmers. Programs need to install themselves, and security updates need to be completely transparent after a mouse click. Popular programs like McAfee are only secure if they make themselves secure.
If you get mod points for sounding ego-centric, you are indeed at the top! (Sorry, but I did not see your star.) Did you know that RTFA is a four-letter-word, but that RTAF (pronounced aretaff) is not? (Read The Article First)!
You missed my point. By monitoring, I meant having police "on-site" at the intersection to ticket those who speed up and go on through an intersection just after the light turns red, knowing that the side street traffic does not have time to get started. These local people will soon learn whether they can safely(?) go on through at a speed that causes the light to turn red (and whether it turns red for them only). If the police are present they will get tickets. After the police no longer attend the intersection daily, there will be fewer tickets, but still attempts to "beat the light". The police may be able to use other monitoring methods including CCTV, but that is not what I meant. It is not presently useful to install CCTV at all major intersections, but that would be a way to help reduce the intersection rushers.
This may work for the occasional traveler through an area, but you can be sure that the technical community who have to go through the intersection each day, will "time" the light so they can speed up and just fly through the intersection as the light is turning red. Sure, there will be a few traffic tickets, but only because the police are monitoring the intersection. That, however, would happen at any intersection if it is monitored closely. As soon as the cops go away, I expect to see more intersection speeding instead of less.
My comment was meant to be funny by being absurd. First, I am glad you are OK. Second, such an accident might have been avoided if your auto had a rear-looking detection and the truck had a front-looking detection that talked to each other in time to avoid the accident, or at least slow things enough to greatly reduce the damage. (Look for some engineer to come up with bumper air bags.)
Auctually, you are right. I was making a joke. RFC was and is the common term used throughout industry for change requests (along with ECN and ECR) long before the internet got started. RFC is for those outside the engineering dept.-generally.
Why is it that the overall sales of consumer goods is never mentioned in articles like this. Just look at the comparable sales by Toys-R-Us during the same time interval.
All batteries have some self discharge. However, I suspect the real problem is either: 1. THe internal wiring is not large enough to support an external short (it would blow and leave the battery useless) or 2. The battery itself may generate internal gasses that could cause it to explode - lawsuits galore. Either case is not good for the customer. Obviously, a series resistor will reduce the battery efficiency in both discharge and charging. NObody wants that, so the real reason for current limiting is some sort of protection.
My AA NiMh is 2100 mAH and that is based on a discharge time of 20 hours. If the charge effeciency is 95 percent (2100/.95) the charge to be returned to the battery will be 2211 mAH or 2.211 AH.
That is 2.211 amps for 60 minutes, 22.11 amps for 6 minutes, or 221.1 amps for.6 minutes (36 seconds).
Now if the internal resistance of the battery is.01 ohm, the power dissipated during the charge time will be (I^2 x R). For 36 seconds the power is 221.1 x 221.1 x.01 = 489 watts. If I am off by a factor of 10 in resistance the power is still 48.9 watts for the AA battery and 36 seconds recharge time.
My camera uses four of those batteries.
The effect is not mysterious and only occurs on NiCads for all practical purposes. It has to do with surface buildup effects on the plates. It is also fully reversable for batteries that go through a full discharge and recharge a couple of times. (At least that's what the battery manufacturers say!)
You're right.
I should stop there to be funny, but since you mentioned it, the battery heat is due to the internal resistance of the battery. If it is low, the power (current squared times resistance) will be low. Note that the article ended with reference to being able to limit the current from the battery, and that makes me think the internal resistance is low, and therefore, low charge/discharge power for heating.
Slashdot Mirror
www.jameco.com, page 194, Phoebe Networking Wireless USB. Just not quite 500 MHz.
The present CDs are very close to 1.1 mm thick, although I do have one that is close to 1.5-mm thick. THe diameter of a thick black hair is about 0.11-mm and that of a blond (natural) is about 0.08-mm. When I pick up a (0.12 x 0.050)-mm particle (I work with those) I cannot tell which side of the tweezers if sticks to, and my tweezers are needle sharp.
This comment lost a score point in going to the next higher level. I don't understand!
Last year my 30 year old daughter informed me of how much data a 7th grade student could put on the six sides of a new yellow pencil. From a few feet away it looks like it has been chewed on so the teacher asks no questions. Use only three sides and it even stays hidden when you put the pencil down.
If IBM had been able to use this technology, no telling how much data they could have put on paper disks! About 2 gigs along the edge even.
Wait, isn't that the same... Oops, I forgot! I said Music Industry.
I meant that now AOL can reduce the price of their CDs.
1.) Is there a uniform standard for what data and how many seconds of time is allowed to be kept in the auto's black box? 2.) How is the accuracy insured? Can someone run into a kid and the black box show that they were only going 25 mph when they were actually going 50? The SRS (safety restraining system)is checked each time I start the engine, but that is only a processor and sensor-OK test. If the airbag does not employ properly or rapidly, does the black box still say it was ok when I started? (OK, three things.)
I was in San Francisco. What is that word BLOACK anyway?
Funny, it still looks wrong even when you spell it right!
Yes!. It's not redundant, and the writer wrote it once to tell what the Feds were doing and again to EMPHASIZE that it is identical to what some states were already implementing.
My point is that for most older, and many young users, PC security is no more than is built-in by the programmers. Programs need to install themselves, and security updates need to be completely transparent after a mouse click. Popular programs like McAfee are only secure if they make themselves secure.
If you get mod points for sounding ego-centric, you are indeed at the top! (Sorry, but I did not see your star.)
Did you know that RTFA is a four-letter-word, but that RTAF (pronounced aretaff) is not? (Read The Article First)!
You missed my point. By monitoring, I meant having police "on-site" at the intersection to ticket those who speed up and go on through an intersection just after the light turns red, knowing that the side street traffic does not have time to get started.
These local people will soon learn whether they can safely(?) go on through at a speed that causes the light to turn red (and whether it turns red for them only). If the police are present they will get tickets. After the police no longer attend the intersection daily, there will be fewer tickets, but still attempts to "beat the light". The police may be able to use other monitoring methods including CCTV, but that is not what I meant. It is not presently useful to install CCTV at all major intersections, but that would be a way to help reduce the intersection rushers.
Send me a check for the amount you owe and I'll include it with mine.
This may work for the occasional traveler through an area, but you can be sure that the technical community who have to go through the intersection each day, will "time" the light so they can speed up and just fly through the intersection as the light is turning red. Sure, there will be a few traffic tickets, but only because the police are monitoring the intersection. That, however, would happen at any intersection if it is monitored closely. As soon as the cops go away, I expect to see more intersection speeding instead of less.
My comment was meant to be funny by being absurd. First, I am glad you are OK. Second, such an accident might have been avoided if your auto had a rear-looking detection and the truck had a front-looking detection that talked to each other in time to avoid the accident, or at least slow things enough to greatly reduce the damage. (Look for some engineer to come up with bumper air bags.)
You're wrong! A good rear-looking system could have immediately steered you into the ditch also, thus avoiding the rear-end collision.
Auctually, you are right. I was making a joke. RFC was and is the common term used throughout industry for change requests (along with ECN and ECR) long before the internet got started. RFC is for those outside the engineering dept.-generally.
Why is it that the overall sales of consumer goods is never mentioned in articles like this. Just look at the comparable sales by Toys-R-Us during the same time interval.
We were using RFC's long before that. But then Request-For-Change was how all this internet stuff got started anyway!
All batteries have some self discharge. However, I suspect the real problem is either: 1. THe internal wiring is not large enough to support an external short (it would blow and leave the battery useless) or 2. The battery itself may generate internal gasses that could cause it to explode - lawsuits galore. Either case is not good for the customer. Obviously, a series resistor will reduce the battery efficiency in both discharge and charging. NObody wants that, so the real reason for current limiting is some sort of protection.
In earth's gravity, the experiment undergoes heating /cooling stresses that do not not exist in micro-gravity.
My AA NiMh is 2100 mAH and that is based on a discharge time of 20 hours. If the charge effeciency is 95 percent (2100/.95) the charge to be returned to the battery will be 2211 mAH or 2.211 AH. That is 2.211 amps for 60 minutes, 22.11 amps for 6 minutes, or 221.1 amps for .6 minutes (36 seconds).
Now if the internal resistance of the battery is .01 ohm, the power dissipated during the charge time will be (I^2 x R). For 36 seconds the power is 221.1 x 221.1 x .01 = 489 watts. If I am off by a factor of 10 in resistance the power is still 48.9 watts for the AA battery and 36 seconds recharge time.
My camera uses four of those batteries.
Did you get your statement and question mixed up?
The effect is not mysterious and only occurs on NiCads for all practical purposes. It has to do with surface buildup effects on the plates. It is also fully reversable for batteries that go through a full discharge and recharge a couple of times. (At least that's what the battery manufacturers say!)
You're right. I should stop there to be funny, but since you mentioned it, the battery heat is due to the internal resistance of the battery. If it is low, the power (current squared times resistance) will be low. Note that the article ended with reference to being able to limit the current from the battery, and that makes me think the internal resistance is low, and therefore, low charge/discharge power for heating.