but does someone know why muscle cell cancer is so rare ? Most of our body is made of muscle or fat cells, yet sarcoma is quite rare. Has someone studied a way to make the other kinds of cells so resistent to cancer ?
The real problems behind solar power is not the surface of the plant, but the variability of solar output. Suppose that your Country produces 100% of its energy from solar. What to do the days whithout sun ? The options are:
1) storing the energy 2) using other source of energy 3) importing the energy needed from other countries 4) dying
Each of these solution is not free, nor it is simple. For example if country A imports its energy from B when it is cloudy over A, and B imports its energy from A when it is cloudy over B,both A and B need to produce more energy than needed by themselves! Storing the energy it is nor cheap nor efficient, and using other sources of power just when it is cloudy is stupid from the economical point of view (using a plant just 1000 hours per year means that the cost of energy produced in these hours is high). So if you want to replace 1GW produced from oil with solar power, you need to produce more than 1 GW !
(I am sorry for the low level of my english, but I have studied it as a second lenguage more than 10 years ago at school! )
>So the Cell is great because there's going to be millions of them sold in >PS3's so they'll be cheap. But it's only really great if a new >custom variant is built. Sounds kind of contradictory.
No, the Cell is great because, as the pdf shows, it has an incredible Gflops/Power ratio, even in its current configuration.
For example, here are the Gflops (double precision) obtained in 2d FFT:
Since Acme got their 'limited patent' first and mine is just pending, Acme wins!
Acme loses, because, as written in the article:
Should the patent owner try to sue an alleged infringer, an examination for novelty would be the initial step in any litigation.
Because your product already is on the market, you win easily. And if is not on the market, you can also win, if you show that the tecnology had been indipendently created, and so Acme is not the first.
(I hope that my english is correct...:-) )
FC have extremally low power density, compared to
internal combustion engines. So they weight more.
Moreover, the cheaper FC use PEM, and have an efficency less than 40%
So you don't gain efficency using a fuel cell instead of an internal combustion engine for moving your car.
Look for example at the
Honda FCX :
with 3.8 kg of hydrogen, it has a range of 190 miles. Because 1 kg of hydrogen has the same content of energy as 1 gallon of gasoline, this car can do 50 mpg(about 21 km/l), the same as hybrid cars or diesel cars.
Moreover hydrogen can be made by many thing, but none cheaper then methane !!! So you pay a lot more, for having the same level of CO2 emitted
Last thing: nuclear cannot be used NOW for the production of hydrogen, because it requires nuclear plants operating at 850 C (at least), instead of 4-500 C of the current generation.
NOTE:I am sorry for my english, but I am not english-native. If you don't like my english, at least check the links, I think that are interesting
I have read a bit of TWENTY HYDROGEN MYTHS, but I hardly find it a seriuos source of information:
for example (at the and of page 5, and in the myth #3) they say that hydrogen fuel-cell cars can canvert energy to motion about 2-3 times as afficient as normal cars convert gasoline into motion.
They don't say the truth: fuel-cells are more efficient, but weight a lot more then internal combustion engines, and so the cars requeire more energy to move, compared to cars equipped with internal combustions. Moreover they do not consider Diesel engines.
Now look at
Honda fcx, and as you can see the REAL efficency (220 miles with 3.75Kg of hydrogen, that contain the energy equivalent of about 3.75 gallons of gasoline=58mpg, but if you consider a 70% efficiency in the production of hydrogen you obtain about 41mpg), is hardly 2-3 times the efficiency of a DIESEL car, and actually is less than a good diesel car (
Honda Accord TDCi, sorry for the link in italian, but look simply at the second row: 92mpg )
and it is worst then
hybrid cars (example
Honda Insight, about 60mpg)
Electric heating is as efficient as gas heating ; in both cases, you're turning virtually all of the available energy into heat.
But producing electricity is not 100% efficient, so
elettricity heating is a lot less efficient than gas heating !
1 kg of gas used for heating gives you a lot more of "useful" heat than 1 Kg of gas used for producing electricity used for heating.
OLED have a lot of problems: this is why OLED displays are not here yet.
I am not an expert of the field, but some time ago I
have found
this report (in PDF) Look at page 2 (second half) for see such problems. Look also at page 16: OLED aren't expected to catch LCD performance until 2007
The article is a bit old, and i don't know if something is changed.
Matter cannot be created or destroyed by chemical reactions: so the amount of CO2 produced by combustion is the same that the trees used for photosyntesis in the production of the nuts.
(Sorry for my english, it is not my natural lenguage, but i hope the things i have written are clear).
people died in Dresden: 35000 (from http://www.meredith.edu/stones/newpage2.htm ) people died in hiroshima: from 90000 to 140000 (from http://www.rerf.or.jp/eigo/faqs/faqse.htm#faq1
I have searched on google. It seems that the reminders of Petralona belongs to a species called Homo heidelbergensis, a species between an homo erectus and an H. neanderthalensis, but for sure NOT a modern human (an homo sapiens sapiens).
Re:Frustratingly typical day in the life of Micros
on
Yet Another Windows Worm
·
· Score: 2, Interesting
On Unix/Linux Desktop systems there is nothing on the system as important as the user's data in his home directory.
You can do a daily backup simply putting something like this in your crontab or in cron.daily:
tar -cjf/var/backup.tbz2/home
But if someone get the root privileges, even the backup can be destroyed.
Moreover, root has more power then a simple user:
he can set promiscuous-mode, he can bind socket on ports below 1024, he can use more resources, and so on, so if a worm| virus | trojan get superuser powers, he can do more dameges at the net, and not only at a single computer.
So, even if the computer is used as a desktop, you can limit the dameges done by a virus, simply not logging as root and being a little smart (doing backups).
Slashdot Mirror
but does someone know why muscle cell cancer is so rare ?
Most of our body is made of muscle or fat cells, yet sarcoma is quite rare.
Has someone studied a way to make the other kinds of cells so resistent to cancer ?
The real problems behind solar power is not the surface of the plant, but the variability of solar output.
Suppose that your Country produces 100% of its energy from solar.
What to do the days whithout sun ?
The options are:
1) storing the energy
2) using other source of energy
3) importing the energy needed from other countries
4) dying
Each of these solution is not free, nor it is simple.
For example if country A imports its energy from B when it is cloudy over A, and B imports its energy from A when it is cloudy over B,both A and B need to produce more energy than needed by themselves!
Storing the energy it is nor cheap nor efficient, and using other sources of power just when it is cloudy is stupid from the economical point of view (using a plant just 1000 hours per year means that the cost of energy produced in these hours is high).
So if you want to replace 1GW produced from oil with solar power, you need to produce more than 1 GW !
(I am sorry for the low level of my english, but I have studied it as a second lenguage more than 10 years ago at school! )
Uranium in the water is harmfull, even if the radiation is low: uranium is a heavy metal, and so it is toxic.
>So the Cell is great because there's going to be millions of them sold in >PS3's so they'll be cheap. But it's only really great if a new
>custom variant is built. Sounds kind of contradictory.
No, the Cell is great because, as the pdf shows, it has an incredible Gflops/Power ratio, even in its current configuration.
For example, here are the Gflops (double precision) obtained in 2d FFT:
Cell+ Cell X1E AMD64 IA64
1K^2 15.9 6.6 6.99 1.19 0.52
2K^2 26.5 6.7 7.10 0.19 0.11
So a single, normal, Cell can be compared with the processor of a Cray (that uses 3 times more power and costs a lot more).
Acme loses, because, as written in the article:
Should the patent owner try to sue an alleged infringer, an examination for novelty would be the initial step in any litigation.Because your product already is on the market, you win easily. And if is not on the market, you can also win, if you show that the tecnology had been indipendently created, and so Acme is not the first. (I hope that my english is correct ... :-) )
the world's #1 greenhouse gas polluter continues to belch out 25% of the world's CO2
And continues to produce 27% of the GWP [wikipedia.org] with it... Looks like we're making good use of that consumption.
No, it doesn't!
CO2 emissions
GWP
As you can see, European Union produces 31% of GWP, and Japan produces 10% of it, producing only 15.3% and 5% of CO2 emissions!
FC have extremally low power density, compared to internal combustion engines. So they weight more.
Moreover, the cheaper FC use PEM, and have an efficency less than 40%
So you don't gain efficency using a fuel cell instead of an internal combustion engine for moving your car.
Look for example at the Honda FCX : with 3.8 kg of hydrogen, it has a range of 190 miles.
Because 1 kg of hydrogen has the same content of energy as 1 gallon of gasoline, this car can do 50 mpg(about 21 km/l), the same as hybrid cars or diesel cars.
Moreover hydrogen can be made by many thing, but none cheaper then methane !!! So you pay a lot more, for having the same level of CO2 emitted
Last thing: nuclear cannot be used NOW for the production of hydrogen, because it requires nuclear plants operating at 850 C (at least), instead of 4-500 C of the current generation.
NOTE:I am sorry for my english, but I am not english-native. If you don't like my english, at least check the links, I think that are interesting
I have read a bit of TWENTY HYDROGEN MYTHS, but I hardly find it a seriuos source of information:
for example (at the and of page 5, and in the myth #3) they say that hydrogen fuel-cell cars can canvert energy to motion about 2-3 times as afficient as normal cars convert gasoline into motion.
They don't say the truth: fuel-cells are more efficient, but weight a lot more then internal combustion engines, and so the cars requeire more energy to move, compared to cars equipped with internal combustions. Moreover they do not consider Diesel engines.
Now look at Honda fcx, and as you can see the REAL efficency (220 miles with 3.75Kg of hydrogen, that contain the energy equivalent of about 3.75 gallons of gasoline=58mpg, but if you consider a 70% efficiency in the production of hydrogen you obtain about 41mpg), is hardly 2-3 times the efficiency of a DIESEL car, and actually is less than a good diesel car ( Honda Accord TDCi, sorry for the link in italian, but look simply at the second row: 92mpg ) and it is worst then hybrid cars (example Honda Insight, about 60mpg)
Electric heating is as efficient as gas heating ; in both cases, you're turning virtually all of the available energy into heat.
But producing electricity is not 100% efficient, so elettricity heating is a lot less efficient than gas heating ! 1 kg of gas used for heating gives you a lot more of "useful" heat than 1 Kg of gas used for producing electricity used for heating.
OLED have a lot of problems: this is why OLED displays are not here yet.
I am not an expert of the field, but some time ago I have found this report (in PDF)
Look at page 2 (second half) for see such problems.
Look also at page 16: OLED aren't expected to catch LCD performance until 2007
The article is a bit old, and i don't know if something is changed.
Matter cannot be created or destroyed by chemical reactions:
so the amount of CO2 produced by combustion is the same that the trees used for photosyntesis in the production of the nuts.
(Sorry for my english, it is not my natural lenguage, but i hope the things i have written are clear).
I think that some number helps:
people died in Dresden: 35000 (from http://www.meredith.edu/stones/newpage2.htm )
people died in hiroshima: from 90000 to 140000 (from http://www.rerf.or.jp/eigo/faqs/faqse.htm#faq1
An exponalial rise is (a lot) FASTER than a quadratic rise ! Example:
2^n for n=5 is 32768 2^n for n=16 is 65536
n^2 for n=15 is 225 n^2 for n=16 is 256
I have searched on google. It seems that the reminders of Petralona belongs to a species called Homo heidelbergensis, a species between an homo erectus and an H. neanderthalensis, but for sure NOT a modern human (an homo sapiens sapiens).
On Unix/Linux Desktop systems there is nothing on the system as important as the user's data in his home directory.
You can do a daily backup simply putting something like this in your crontab or in cron.daily:
tar -cjf /var/backup.tbz2 /home
But if someone get the root privileges, even the backup can be destroyed.
Moreover, root has more power then a simple user: he can set promiscuous-mode, he can bind socket on ports below 1024, he can use more resources, and so on, so if a worm| virus | trojan get superuser powers, he can do more dameges at the net, and not only at a single computer.
So, even if the computer is used as a desktop, you can limit the dameges done by a virus, simply not logging as root and being a little smart (doing backups).