The whole nationalist issue is a sick idea which has caused many silly conflicts.
Many of us have been working in more than one country, and that percentage is sure to increase with better transportation etc. Nationality is less and less important.
E.g: Does it make me 1/39'th french that I've lived and worked a year in France?
My brother worked a year in Hungary and his family lived there too, does this make his kids 1/6'th and 1/3'rd Hungarian?
The ARPA net nodes constantly measured how much time it took for at packet to reach a destination.
The measurements was kept up-to-date for each route out of the node.
When a packet arrived to a node, it was sent out via the fastest route to its destination using a simple table lookup.
If we let some cars (e.g. taxis) report their progress back to a central system, the system can use that info to "route" cars to their destination - if and only if the system knows where the cars should go.
A very simple transponder in each car will suffice to tell the router where your car wants to go - the router won't need to know anything else about your car, e.g. no ID's will be needed.
The chemestry prize is in the same field which got Jens Christian Skou a Nobelprize in 1997.
Jens Christian Skou was awarded for the discovery (in 1957) of the sodium-kalium pump mechanism.
It explains how cells transport ions against a concentration gradient.
LocustWorld.com did this ages ago...
on
MIT Roofnet
·
· Score: 1
A British inventor called Jon Anderson did this in full scale quite some time ago.
Have a look at http://www.locustworld.com. The software also can convert an old PC into a mesh-enabled gateway or repeater, as long as you use one of the supported wireless adapters and NIC's.
The technology has changed since Edison. The "small" (that is low-voltage) generators Edison imagined are no longer needed. You can have the DC generators as big and with as high voltage as you like. And you can use even higher voltages for the distribution grid.
The argument about line losses are therefore no longer valid. Line losses are not due to DC, they are due to the high currents needed if the voltage must be low. AC circumvents this with simple transformers. It used to be impossible to shift voltages from one DC level to another. Not anymore.
Modern switch mode step up and step down techology is very efficient. That's why we can - and should - build a high voltage DC distribution grid with step-down converters before the delivery points to the customers.
The low voltage will protect the customers.
E.g. the electric chair isn't dangerous if the voltage is low.
Edison probably wanted to make a point about high voltages to support his low-voltage DC distribution idea.
So if you want to minimize resistive losses, you must increase voltage and decrease current.
If you want to transfer say 100 watts, that's possible with several combinations of voltage and current:
P=U*I
100W = 10V * 10A = 100V * 1A = 1000V * 0.1A
Since it's easy to pump up the voltage and thus decrease the current using a transformer, AC seems to be the best way to go. But...
now we have power electronics! You can now convert the voltages as needed. E.g. the PSU in a PC often converts from several hundred volts to 12, 5 and -12 (perhaps also more low voltages) without any transformer in a "step-down" converter.
So you'll use high voltage (and therefore low current) for long distance power transfers and convert to low voltage and high current when you arrive near the consumer.
The resistance depends on the length, material and thickness of a power line.
For long distances, AC has more loss than DC because a power grid has inductive losses and capacitive losses. DC transfers do not have those losses.
The power distribution everywhere in the western world is done using high voltage 3-phase AC systems.
They fail, if a) the frequency slips or b) if the power balance between production and demand gets to big.
The reason for all the hazzle of AC distribution is that it's simple to change voltages via transformers.
With modern power electronics, transformers will no longer be needed.
A DC distribution grid will be much more stable since the only reasons to take a generator off the network will be overload or overvoltage.
There is no frequency to lock to. There is no syncronizing phase when the generator starts production again.
At times with high demand, the DC grid voltage will drop. Surplus production will push up the grid voltage.
Circuit breakers can be set to turn on at a certain voltage, that automatically will turn on demand when the grid voltage can drive the load. Low priority areas can have the high-voltage switches, high priority areas have low-voltage switches.
Combine this with a varying price: Low voltage = high price, high voltage = low price and you'll get system which can smoothe out changes in the balance between supply and demand.
Will it work? Well, we do have some DC links from Denmark to Germany and to Norway. They are relatively small but power electronics are developing fast.
The power distribution everywhere in the western world is done using high voltage 3-phase AC systems.
They fail, if a) the frequency slips or b) if the power balance between production and demand gets to big.
The reason for all the hazzle of AC distribution is that it's simple to change voltages via transformers.
With modern power electronics, transformers will no longer be needed.
A DC distribution grid will be much more stable since the only reasons to take a generator off the network will be overload or overvoltage.
There is no frequency to lock to. There is no syncronizing phase when the generator starts production again.
At times with high demand, the DC grid voltage will drop. Surplus production will push up the grid voltage.
Circuit breakers can be set to turn on at a certain voltage, that automatically will turn on demand when the grid voltage can drive the load. Low priority areas can have the high-voltage switches, high priority areas have low-voltage switches.
Combine this with a varying price: Low voltage = high price, high voltage = low price and you'll get system which can smoothe out changes in the balance between supply and demand.
Will it work? Well, we do have some DC links from Denmark to Germany and to Norway. They are relatively small but power electronics are developing fast.
Sometimes I wonder if the FDA approval is too difficult to obtain. It's always a balance between getting the products onto the market and keeping them safe. It's said to cost near one billion US$ to get a new drug on the market - not many companies can afford someting even remotely as expensive for a mechanical aid.
The patent covers a position INDICATING system, not a position FINDING system.
STDMA depends on GPS to deliver an accurate timing signal. The timing is then used to pick the right time to transmit in "your" timeslot on the shared radio frequency.
The links you included even suggest that the marine transponders using this technology should transmit their positions - which is also delivered by the GPS.
Learn to speak German - Germany is a big contry, everything is in German. You'll get to watch M*A*S*H in German. You'll see John Wayne and hear the words "Hände Hoch!" (Hands up).
Speak German and you will get a real world connection which is much better than any broadband connection.
English speaking people will get a working knowledge of German quickly (in about 3 months my guess) since the languages are both Germanic.
My native language is Danish and I worked in France 12 months. After I learned some French the stay was much more fun, you will probably experience the same thing.
It is similar to a measurement on a car, where you rev up the engine to max and suddenly let go of the clutch. I'm sure most car engines will "measure" more than 5 times the sustained max power for a few milliseconds.
A 1960 VW Beetle 1100 cc engine has 150 horsepowers if you measure that way.
"removes all solid waste before dumping the water"
Well, where do the solid waste go then?
Sooner or later, it will turn up near someone - possibly you. The issue is if it still is dangerous to you after the processes, it went through on the way.
That was my point.
We both know that a lot of processes can be applied to waste water in order to reduce these risks. Sometimes it makes sense to reuse waste water thereby preserving natural reserves of clean water.
The question is if any site did this before 1996 when the patent was applied for. That's called "prior art" and proof of that would invalidate the patent.
Let a geek log in on your system
on
Adopt a KDE Geek
·
· Score: 1
I guess a lot of us would let a geek log in on our system(s) and compile there as a niced process. The boxes are running anyway...
The geek can then get the compiled code for testing.
Slashdot Mirror
Check out:
u x/ core/test/1.90/i386/os/images/
ftp://download.fedora.redhat.com/pub/fedora/lin
You'll see that the bootdisk.img and netdrv.img are missing.
You'll have to make a bootable CD in order to net-install. My firewall machine does not have a CD-ROM drive at all.
Not having ye good olde floppy images is a step backwards, methinks.
The whole nationalist issue is a sick idea which has caused many silly conflicts.
Many of us have been working in more than one country, and that percentage is sure to increase with better transportation etc. Nationality is less and less important.
E.g: Does it make me 1/39'th french that I've lived and worked a year in France?
My brother worked a year in Hungary and his family lived there too, does this make his kids 1/6'th and 1/3'rd Hungarian?
The ARPA net nodes constantly measured how much time it took for at packet to reach a destination.
The measurements was kept up-to-date for each route out of the node.
When a packet arrived to a node, it was sent out via the fastest route to its destination using a simple table lookup.
If we let some cars (e.g. taxis) report their progress back to a central system, the system can use that info to "route" cars to their destination - if and only if the system knows where the cars should go.
A very simple transponder in each car will suffice to tell the router where your car wants to go - the router won't need to know anything else about your car, e.g. no ID's will be needed.
Will it work? It seems almost too simple.
which covers into areas, where no computer has ever set its foot...
The chemestry prize is in the same field which got Jens Christian Skou a Nobelprize in 1997.
Jens Christian Skou was awarded for the discovery (in 1957) of the sodium-kalium pump mechanism.
It explains how cells transport ions against a concentration gradient.
A British inventor called Jon Anderson did this in full scale quite some time ago.
/. too.
Have a look at http://www.locustworld.com. The software also can convert an old PC into a mesh-enabled gateway or repeater, as long as you use one of the supported wireless adapters and NIC's.
Yes, it's been mentioned several times on
GE may be one of the leaders, Vestas just makes more money doing wind power. The US is one of their most profitable markets.
http://www.vestas.dk/
I own some stock, so I'm biased.
The distance argument is void with modern step-up and step-down switch mode conversion.
If you use say 100kV DC versus 100 kV AC, the DC line will have lower losses at long distances due to the absense of inductive and capacitive losses.
Resistive line losses are NOT due to DC, they are due to low voltage and therefore high current. That's independent of AC versus DC.
The technology has changed since Edison. The "small" (that is low-voltage) generators Edison imagined are no longer needed. You can have the DC generators as big and with as high voltage as you like. And you can use even higher voltages for the distribution grid.
The argument about line losses are therefore no longer valid. Line losses are not due to DC, they are due to the high currents needed if the voltage must be low. AC circumvents this with simple transformers. It used to be impossible to shift voltages from one DC level to another. Not anymore.
Modern switch mode step up and step down techology is very efficient. That's why we can - and should - build a high voltage DC distribution grid with step-down converters before the delivery points to the customers.
The low voltage will protect the customers.
E.g. the electric chair isn't dangerous if the voltage is low.
Edison probably wanted to make a point about high voltages to support his low-voltage DC distribution idea.
Resistance loss depend on the current.
...
Loss = R*I^2
So if you want to minimize resistive losses, you must increase voltage and decrease current.
If you want to transfer say 100 watts, that's possible with several combinations of voltage and current:
P=U*I
100W =
10V * 10A =
100V * 1A =
1000V * 0.1A
Since it's easy to pump up the voltage and thus decrease the current using a transformer, AC seems to be the best way to go. But
now we have power electronics! You can now convert the voltages as needed. E.g. the PSU in a PC often converts from several hundred volts to 12, 5 and -12 (perhaps also more low voltages) without any transformer in a "step-down" converter.
So you'll use high voltage (and therefore low current) for long distance power transfers and convert to low voltage and high current when you arrive near the consumer.
The resistance depends on the length, material and thickness of a power line.
For long distances, AC has more loss than DC because a power grid has inductive losses and capacitive losses. DC transfers do not have those losses.
The power distribution everywhere in the western world is done using high voltage 3-phase AC systems.
They fail, if
a) the frequency slips or
b) if the power balance between production and demand gets to big.
The reason for all the hazzle of AC distribution is that it's simple to change voltages via transformers.
With modern power electronics, transformers will no longer be needed.
A DC distribution grid will be much more stable since the only reasons to take a generator off the network will be overload or overvoltage.
There is no frequency to lock to. There is no syncronizing phase when the generator starts production again.
At times with high demand, the DC grid voltage will drop. Surplus production will push up the grid voltage.
Circuit breakers can be set to turn on at a certain voltage, that automatically will turn on demand when the grid voltage can drive the load. Low priority areas can have the high-voltage switches, high priority areas have low-voltage switches.
Combine this with a varying price: Low voltage = high price, high voltage = low price and you'll get system which can smoothe out changes in the balance between supply and demand.
Will it work? Well, we do have some DC links from Denmark to Germany and to Norway. They are relatively small but power electronics are developing fast.
The power distribution everywhere in the western world is done using high voltage 3-phase AC systems.
They fail, if
a) the frequency slips or
b) if the power balance between production and demand gets to big.
The reason for all the hazzle of AC distribution is that it's simple to change voltages via transformers.
With modern power electronics, transformers will no longer be needed.
A DC distribution grid will be much more stable since the only reasons to take a generator off the network will be overload or overvoltage.
There is no frequency to lock to. There is no syncronizing phase when the generator starts production again.
At times with high demand, the DC grid voltage will drop. Surplus production will push up the grid voltage.
Circuit breakers can be set to turn on at a certain voltage, that automatically will turn on demand when the grid voltage can drive the load. Low priority areas can have the high-voltage switches, high priority areas have low-voltage switches.
Combine this with a varying price: Low voltage = high price, high voltage = low price and you'll get system which can smoothe out changes in the balance between supply and demand.
Will it work? Well, we do have some DC links from Denmark to Germany and to Norway. They are relatively small but power electronics are developing fast.
I guess you mean that the approval IS to much of a hazzle since it pushes prices that high?
Sometimes I wonder if the FDA approval is too difficult to obtain. It's always a balance between getting the products onto the market and keeping them safe. It's said to cost near one billion US$ to get a new drug on the market - not many companies can afford someting even remotely as expensive for a mechanical aid.
It seems to be a film quote from 1970 with no evidence.
s _s leeping_giant_quote
Check out
http://www.wikipedia.org/wiki/Isoroku_Yamamoto'
or try Google with "Isoroku Yamamoto giant" as the search words.
The upside of standards is that mass production and competition is enabled by them.
Sure, you don't need a standard for something home grown small scale system, but that's not the point.
Can you imagine the current prices for wireless networks without standards ?
In another sector: How many nuts and bolts would be needed by your auto repair shop if standards didn't exist?
We've got portable cell phone numbers in Denmark, it's been 2 years now.
/min) due to the competion which was enabled by portability.
Prices went down from 3-5 DKr/min to 1,10 DKr/min (thats near 0,15
This advantage far exceeds the extra routing-cost which is needed for portability.
There will be a war with Iraq within a few days.
The coalition against Iraq counts 30 members at least. Quite a few of these are European.
You got it wrong, I'm afraid.
The patent covers a position INDICATING system, not a position FINDING system.
STDMA depends on GPS to deliver an accurate timing signal. The timing is then used to pick the right time to transmit in "your" timeslot on the shared radio frequency.
The links you included even suggest that the marine transponders using this technology should transmit their positions - which is also delivered by the GPS.
Speak German and you will get a real world connection which is much better than any broadband connection.
English speaking people will get a working knowledge of German quickly (in about 3 months my guess) since the languages are both Germanic.
My native language is Danish and I worked in France 12 months. After I learned some French the stay was much more fun, you will probably experience the same thing.
1000 watts peak is pure fiction.
It is similar to a measurement on a car, where you rev up the engine to max and suddenly let go of the clutch. I'm sure most car engines will "measure" more than 5 times the sustained max power for a few milliseconds.
A 1960 VW Beetle 1100 cc engine has 150 horsepowers if you measure that way.
"removes all solid waste before dumping the water"
Well, where do the solid waste go then?
Sooner or later, it will turn up near someone - possibly you. The issue is if it still is dangerous to you after the processes, it went through on the way.
That was my point.
We both know that a lot of processes can be applied to waste water in order to reduce these risks. Sometimes it makes sense to reuse waste water thereby preserving natural reserves of clean water.
I wonder what the writer of the write-up think happen with all other human waste?
You and I both live in the middle of mother natures great recycler.
There is no such thing as to remove human waste, you may MOVE it at best.
The question is if any site did this before 1996 when the patent was applied for. That's called "prior art" and proof of that would invalidate the patent.
I guess a lot of us would let a geek log in on our system(s) and compile there as a niced process. The boxes are running anyway...
The geek can then get the compiled code for testing.
Would that help you guys?