I think you may have something incorrect with your physics model.
1 Driver sees traffic come to a screeching halt, and applies brakes hard enough to stop before he gets to the car in front of him. He doesn't slam on the brakes, but hits them pretty hard.
Okay, I'm with you here...
2 The vehicle rolls over a bump or pothole. As the wheel lifts off the pavement, the brakes lock the wheel.
...so far, so good...
3 ABS is triggered, modulating the brake pressure.
You are assuming it's modulating the pressure to all the wheels, I believe that most modern systems modulate only the affected wheel, or at worst modulate the fronts independently, and the rears together...
3 The wheel returns to the pavement, and starts rolling again. All four tires now have optimal frictional contact, but it will take the ABS system another second or two to figure this out.
It might take you a second or two for you to notice, but the ABS is modulating at least 10-15 times per second
3 The driver sense that he's lost braking power, so he pushes the pedal down farther. The ABS system recognizes that this is typical of what drivers do during slippery conditions, so it remains engaged. As the driver applies more pressure to the pedal, the ABS system bleeds off this pressure.
As it should, to keep the wheels from locking, because a locked wheel is not stoping you as quickly as one approaching lock.
4 The vehicle, having lost about 50% of normal braking power, collides with the vehicle in front of it. After all four wheels have stopped, the ABS system determines that there is no longer a need to active itself and disengages.
Um, where'd you get 50% from? Let's assume it is 50% with ABS...it's the upset to car caused by the pothole that reduced the stopping power, not the ABS. Without the ABS, I'd wager you'd lose greater than 50% and possible have the car yawing at the same time.
The average driver who detects wheel lock can reduce pressure on the brakes and maintain about 70% to 80% of wheel-lockup pressure. But when ABS kicks in, braking power is typically reduced to less than 50% of wheel-locking pressure.
Please cite some sources for this, I'd be interested to read further.
You really want to keep those wheels turning, unless you are in snow or gravel.
I will never buy another new car w/o ABS.
Let me cite you an example from my daily commute: I drive a 2002 Hyundai Elantra with ABS. Each day on my way to work, I go down a hill with a stop sign at the end of it, near the bottom of the hill, there is regularly water draining down the right side from higher up the hill, and depending on conditions, it may also be muddy. ABS usually kicks in when it hits the water/mud, braking is unaffected to the wheels that are still on dry pavement, I am able to get stopped for the stop sign, and keep straight, even though at least one wheel on the right side of my car has lost much of it's traction.
I'm sorry, before ABS, the reasonable expectation was that if you slam on your brakes, your wheels lock up and you take longer to stop, and loose directional control of your car. ABS may make the distance to stop your car slightly greater in dry weather, if you can brake like Niki Lauda or Michael Schumacher.
I know I pretty much can't do that, so I'll gladly slam on the brakes as hard as I can, and let the computer figure it out, I guarantee you that I'll stop faster that way.
Well you can nail tack strips to concrete, but they do use glue to stick the pad down to the concrete. The carpet is then stretched and tucked over the pad.
I just had new carpet installed about a month ago.
Let me start by saying that I think 'Lindows' is a pretty dumb name, it just sounds me too-ish.
That being said, IIRC Microsoft doesn't have a trademark on the word Windows...it's too generic. Their trademark is on 'Microsoft Windows', 'Windows XP', etc. Linux is a trade mark, Mac OSX is a trademark.
So I think it's wrong for Microsoft to be able to force Lindows to change it's name.
I did read your post...do you know how the Legistlative branch of the US government works?
Each state has two, countem, 2 senators, no more no less. There are 100 senators in the senate, 2 per state. That is what helps prevent a less populous state from getting it's rights trampled over by a more populous state.
Bill's have to be approved by both the house _and_ the senate before they can be signed into law by the POTUS.
Eh, this is the United States of America, the concept of state is very much alive. Or should we just chuck the whole Governor and State Legislature thing out all together too, and go with a government structure that is more centrally planned, like China's?
So basically you're saying that the people in the 5-10 largest urban areas will decide for everybody because that's where the majority lives.
The constitution was built to provide for protection of the minority, and not rule by the majority. (e.g. the Senate). Similarly, the POTUS is elected by the people in each State, not the people of the U.S.as a whole. This serves to protect the interest of each state, and prevent tyrany of the majority.
Am I the only US person to have Sinclair ZX81?
on
First Computers
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· Score: 1
My first computer was a Sinclair ZX81 (with the 16k expansion pack)....I think that my folks ordered it from American Express.
Yes you probably have to activate it, but, in the US it is illegal to send someone a credit card if they didn't request it. I think you'll find that once the credit card company finds that a fraud has been commited, they will deal with it.
SBC's base is 384 down and 128 up, but they offer 1500 down and 128 up for the same price. I think the 384 option is so they can offer service to customers who are too far away from the dslam to guarantee 1.5m down.
Lit up with anticipation We arrive at the launching site The sky is still dark, nearing dawn On the Florida coastline
Circling choppers slash the night With roving searchlight beams This magic day when super-science Mingles with the bright stuff of dreams
Floodlit in the hazy distance The star of this unearthly show Venting vapours, like the breath Of a sleeping white dragon
Crackling speakers, voices tense Resume the final count All systems check, T minus nine As the sun and the drama start to mount
The air is charged A humid, motionless mass The crowds and the cameras, The cars full of spectators pass Excitement so thick you could cut it with a knife Technology...high, on the leading edge of life
The earth beneath us starts to tremble With the spreading of a low black cloud A thunderous roar shakes the air Like the whole world exploding
Scorching blast of golden fire As it slowly leaves the ground Tears away with a mighty force The air is shattered by the awesome sound
Like a pillar of cloud The smoke lingers high in the air In fascination With the eyes of the world We stare...
'Countdown' by Rush, on the occasion of Columbia's first flight.
Re:They Should put this on
on
SAUNAAB
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The broadband service is providec by Connexion by Boeing (sorry it's got flash), the Boeing news release can be found here.
Here's the text from the Boeing news release:
ABOVE THE NORTH ATLANTIC, Jan. 15, 2003 - A new era in inflight communications began today as commercial airline passengers experienced inflight broadband Internet access for the first time.
Passengers aboard a Lufthansa German Airlines Boeing 747-400 were able to use their personal laptops and ones provided by the airline to gain high-speed connections to the Internet, including full access to their personal or business email accounts and files. They were able to attach files to their outgoing emails or open attachments from incoming emails, get the latest news, look up information about their destination or shop online. The service, which Lufthansa has branded as FlyNet, is powered by the revolutionary Connexion by Boeing system developed by The Boeing Company (NYSE: BA).
During the three-month demonstration, Lufthansa will make the service available free-of-charge to passengers throughout the airplane, which flies daily between Frankfurt and Washington-Dulles International Airport as flights LH 418 (westbound) and LH 419 (eastbound).
"With broadband connectivity, the Connexion by Boeing service gives travelers new and unprecedented choices for managing their time in flight and on the ground," said Connexion by Boeing President Scott Carson. "Lufthansa is widely recognized and respected as a leader in innovation, in communication and in customer service, and is demonstrating to its passengers today what the world of tomorrow will be like. Our collaboration with Lufthansa has resulted in the shared vision that has made this historical service available today." "The very idea of FlyNet was exciting, but what really inspired me was the enthusiasm, the professionalism and the stamina of our team during its implementation. Innovation with the customer in mind has resulted in today's world premiere," says Wolfgang Mayrhuber, Deputy Chairman of Deutsche Lufthansa AG.
Lufthansa, the inaugural commercial airline customer for Connexion by Boeing, intends to equip approximately 80 long-range Boeing 747-400 and Airbus A330 / A340 jetliners with the Connexion by Boeing service capability beginning in mid-2004.
About Connexion by Boeing Connexion by Boeing is a mobile information services provider that is bringing high-speed Internet, data and entertainment connectivity to aircraft in flight. The service currently is available to the executive services market in the U.S., which includes operators of private and government aircraft. The three-month service demonstration with Lufthansa begins in January 2003, followed one month later by a three-month service demonstration with British Airways, scheduled to begin in mid-February. Japan Airlines and Scandinavian Airlines System (SAS) also have announced plans to equip longer-range jetliners in their fleets beginning in 2004. For additional information, visit the Connexion by Boeing web site at www.boeing.com/connexion.
If the suspensions were properly designed on such cars, there would not be a problem keeping the tires in contact with the road.
As for whether I (or the average driver) would benefit from ABS...I don't have the reflexes of Niki Lauda or Michael Schumacher, so I'll gladly allow the computer to figure it out.
Been following the coverage on Mac Central and Jobs just announced it, seems the terms are the same as what was stated in the above mentioned faq.
anyone want lerxst@mac.com? I guess it'll be available in the near future:-(.
Slashdot Mirror
I think you may have something incorrect with your physics model.
1 Driver sees traffic come to a screeching halt, and applies brakes hard enough to stop before he gets to the car in front of him. He doesn't slam on the brakes, but hits them pretty hard.
Okay, I'm with you here...
2 The vehicle rolls over a bump or pothole. As the wheel lifts off the pavement, the brakes lock the wheel.
...so far, so good...
3 ABS is triggered, modulating the brake pressure.
You are assuming it's modulating the pressure to all the wheels, I believe that most modern systems modulate only the affected wheel, or at worst modulate the fronts independently, and the rears together...
3 The wheel returns to the pavement, and starts rolling again. All four tires now have optimal frictional contact, but it will take the ABS system another second or two to figure this out.
It might take you a second or two for you to notice, but the ABS is modulating at least 10-15 times per second
3 The driver sense that he's lost braking power, so he pushes the pedal down farther. The ABS system recognizes that this is typical of what drivers do during slippery conditions, so it remains engaged. As the driver applies more pressure to the pedal, the ABS system bleeds off this pressure.
As it should, to keep the wheels from locking, because a locked wheel is not stoping you as quickly as one approaching lock.
4 The vehicle, having lost about 50% of normal braking power, collides with the vehicle in front of it. After all four wheels have stopped, the ABS system determines that there is no longer a need to active itself and disengages.
Um, where'd you get 50% from? Let's assume it is 50% with ABS...it's the upset to car caused by the pothole that reduced the stopping power, not the ABS. Without the ABS, I'd wager you'd lose greater than 50% and possible have the car yawing at the same time.
The average driver who detects wheel lock can reduce pressure on the brakes and maintain about 70% to 80% of wheel-lockup pressure. But when ABS kicks in, braking power is typically reduced to less than 50% of wheel-locking pressure.
Please cite some sources for this, I'd be interested to read further.
You really want to keep those wheels turning, unless you are in snow or gravel.
I will never buy another new car w/o ABS.
Let me cite you an example from my daily commute: I drive a 2002 Hyundai Elantra with ABS. Each day on my way to work, I go down a hill with a stop sign at the end of it, near the bottom of the hill, there is regularly water draining down the right side from higher up the hill, and depending on conditions, it may also be muddy. ABS usually kicks in when it hits the water/mud, braking is unaffected to the wheels that are still on dry pavement, I am able to get stopped for the stop sign, and keep straight, even though at least one wheel on the right side of my car has lost much of it's traction.
YMMV
I'm sorry, before ABS, the reasonable expectation was that if you slam on your brakes, your wheels lock up and you take longer to stop, and loose directional control of your car.
ABS may make the distance to stop your car slightly greater in dry weather, if you can brake like Niki Lauda or Michael Schumacher.
I know I pretty much can't do that, so I'll gladly slam on the brakes as hard as I can, and let the computer figure it out, I guarantee you that I'll stop faster that way.
Well you can nail tack strips to concrete, but they do use glue to stick the pad down to the concrete. The carpet is then stretched and tucked over the pad.
I just had new carpet installed about a month ago.
Let me start by saying that I think 'Lindows' is a pretty dumb name, it just sounds me too-ish.
That being said, IIRC Microsoft doesn't have a trademark on the word Windows...it's too generic. Their trademark is on 'Microsoft Windows', 'Windows XP', etc. Linux is a trade mark, Mac OSX is a trademark.
So I think it's wrong for Microsoft to be able to force Lindows to change it's name.
I did read your post...do you know how the Legistlative branch of the US government works?
Each state has two, countem, 2 senators, no more no less. There are 100 senators in the senate, 2 per state. That is what helps prevent a less populous state from getting it's rights trampled over by a more populous state.
Bill's have to be approved by both the house _and_ the senate before they can be signed into law by the POTUS.
Eh, this is the United States of America, the concept of state is very much alive. Or should we just chuck the whole Governor and State Legislature thing out all together too, and go with a government structure that is more centrally planned, like China's?
Yeah, that's the ticket. Not.
So basically you're saying that the people in the 5-10 largest urban areas will decide for everybody because that's where the majority lives.
The constitution was built to provide for protection of the minority, and not rule by the majority. (e.g. the Senate). Similarly, the POTUS is elected by the people in each State, not the people of the U.S.as a whole. This serves to protect the interest of each state, and prevent tyrany of the majority.
My first computer was a Sinclair ZX81 (with the 16k expansion pack)....I think that my folks ordered it from American Express.
It was not a Timex-Sinclair 1000!!
In the form of guitar effect boxes...they mimic the sound (well good ones do) of a Leslie speaker cabinet!!!
Yes you probably have to activate it, but, in the US it is illegal to send someone a credit card if they didn't request it. I think you'll find that once the credit card company finds that a fraud has been commited, they will deal with it.
SBC's base is 384 down and 128 up, but they offer 1500 down and 128 up for the same price. I think the 384 option is so they can offer service to customers who are too far away from the dslam to guarantee 1.5m down.
It's not showing up on my software update, or on apples page anymore, I guess they are going to fix the ethernet problem.
Also made it real convenient for Jury Duty.
Don't be knockin UHF!!!!
Not anymore!
Ah, thanks for the clarification.
Hmmm, I guess the German people do not have the same guarantees of free speech as we do in the US.
Lit up with anticipation
We arrive at the launching site
The sky is still dark, nearing dawn
On the Florida coastline
Circling choppers slash the night
With roving searchlight beams
This magic day when super-science
Mingles with the bright stuff of dreams
Floodlit in the hazy distance
The star of this unearthly show
Venting vapours, like the breath
Of a sleeping white dragon
Crackling speakers, voices tense
Resume the final count
All systems check, T minus nine
As the sun and the drama start to mount
The air is charged
A humid, motionless mass
The crowds and the cameras,
The cars full of spectators pass
Excitement so thick you could cut it with a knife
Technology...high, on the leading edge of life
The earth beneath us starts to tremble
With the spreading of a low black cloud
A thunderous roar shakes the air
Like the whole world exploding
Scorching blast of golden fire
As it slowly leaves the ground
Tears away with a mighty force
The air is shattered by the awesome sound
Like a pillar of cloud
The smoke lingers high in the air
In fascination
With the eyes of the world
We stare...
'Countdown' by Rush, on the occasion of Columbia's first flight.
Or the Red Green show...
Here's the text from the Boeing news release:
If the suspensions were properly designed on such cars, there would not be a problem keeping the tires in contact with the road.
As for whether I (or the average driver) would benefit from ABS...I don't have the reflexes of Niki Lauda or Michael Schumacher, so I'll gladly allow the computer to figure it out.
Isnt't the dialtone the sound you hear on the phone before you start dialing???
Shouldn't this be called something like 'Ringtones?'
You've obviously never been in Texas when it's 105 degrees outside....
Been following the coverage on Mac Central and Jobs just announced it, seems the terms are the same as what was stated in the above mentioned faq. :-(.
anyone want lerxst@mac.com? I guess it'll be available in the near future
Why bother compressing at all when you've got that much room!!
Heck, it was the /. editor that added that comment!
Note that the bit about buying Bush is not in italics. Too bad we can't mod the story as flamebait.