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Comments

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No P = NP Proof After All

burtosis Re:Wow. (318 comments)

Wow, that's like the worst first /. post ever. Actually read the article...

more than 3 years ago
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Court Rules Dungeons and Dragons Threatens Prison Security

burtosis Re:Usual Slashdot Timeliness (353 comments)

Jesus saves, Everyone else takes full damage...

more than 3 years ago
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Official — Economic Crash Not Computers' Fault

burtosis Funny (386 comments)

That's just what my computer model said too...

more than 3 years ago
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Google Secretly Tests Autonomous Cars In Traffic

burtosis Would incur billions in lawsuits in US (561 comments)

Lets say thier algorithms are 1000 times better than a human driver at avoiding accidents, at least statistically. Given that in 2009 over 40,000 auto deaths occured and over 250k childred were injured (http://www.edgarsnyder.com/car-accident/statistics.html) that would translate into hundereds or thousands of multi-million dollar lawsuits against the navigation company per year. Not to mention the countless fender benders that the system would be responsible for. Even dumbasses running into the car at no fault to the navigation company will probably be dragged into court. You think you can code dumbassery avoidance into the car? They will build a better dumbass. You will see this technology in Japan and Germany well before the US simply due to the popular acceptance of these technologies as well as the legal ramifications. State of the art algorithms such as these are not nearly as good as a moderately competent driver under generalized circumstances - as a single example just put a google car on icy snowy roads and see how well its vision algorithm tracks the road or how well it's laser or sonic sensors work when fouled with snow.

more than 3 years ago
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How Statistics Can Foul the Meaning of DNA Evidence

burtosis Everyone knows 9/5 of statistics are made up (215 comments)

This should only suprise people who think court cases are about facts and justice. It is well known that facts just get in the way of what's true and real.

about 4 years ago
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The Definitive Evisceration of The Phantom Menace *NSFW*

burtosis Han shot first! (629 comments)

IMHO the decline into craptacularism and lowered expectations started with the re-release of an otherwise good film.

more than 4 years ago
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Aussie Scientists Find Coconut-Carrying Octopus

burtosis Not suprising (205 comments)

On a trip to Florida, I found a neat clump of shells in shallow water. I picked it up and put it in a bucket along with some other shells thinking it was interesting. A few moments later I had a pile of shells and an octopus looking up at me angrily. So if it's smart enough to roll itself in shells, using it's suckers to keep them on, it’s not too surprising to me that these ones decided to use coconuts.

Funny thing is that split coconuts probably aren't too common unless people or animals split them.

more than 4 years ago
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Micro-Black Holes Make Poor Planet Killers

burtosis WMD not yet, but perhaps someday? (314 comments)

I don't doubt the science behind the LHC or the scenarios presented. But I wonder if it is possible to make a device (probaby insanely expensive and massive like the LHC) whereby the MHB could be accurately force fed like a veal calf untill it hit a critical point (tons - ktons - Mtons) of mass and would be a worthy earth destroyer. Nuclear weapons just destroy a little area and make the world far less habitable. A good size black hole could

more than 4 years ago
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Tesla Roadster Breaks Distance Record For Electric Car

burtosis Re:Electric cars are not better for the enviornmen (392 comments)

You are wrong...

I am always interested in the CO2 output of these pure electric vehicles. After all, right now we power most of the electric grid with coal and until that changes it dosen't make sense to wish or just assert what things out to be instead of just doing some simple research and high school physics calculations.

Let's look at the real data from the real sources...

According to Tesla motors official specifications [teslamotors.com] the motor has a output of 248 peak horsepower (185kW) and 276 ft/lbs (375 Nm) of torque. Also, for full charge it takes "3.5 hours using the Tesla Motors Home Connector at 240 Volts and 70 amps" which for simplicity and because they have neglected to disclose the actual kwh of full empty to full charge at room temperature (capacity will degrade with use) lets assume is 3.5hrs * (240V * 70A) = 58.8 kwh. Most likely this is an overly conservative estimate because of the constant current constant voltage nature of charging lithium batteries. This is more important than battery capacity because it is the load the power plant feels to charge your car and is the important quantity of interest. This will take you 244 miles on average (from same site) of course flat straight stretches will get better but it is the average that is most important. Total is 58.8 kwh/ 244 miles or about .241 kwh/mile. You can do the math on charging, but it should be obvious at this point that it is much cheaper than gasoline since electricity costs from around 7-20 cents/kwh in the US depending on numerous factors.

Now go look at EPA official website for determining CO2 emissions [epa.gov] (in the US) and you can see that generating one kwh gives you 7.18x10^-4 metric tons of CO2. In addition, they also state on the same page you generate 8.81*10-3 metric tons of CO2 per gallon gasoline.

Lets do some simple math. At .241 kwh/mi this gives you (.241 kwh/mi * 7.18x10^-4 metric tons CO2/kwh) = 1.73 x 10^-4 tons of CO2/mile. At 8.81 x 10^-3 metric tons of CO2/gallon (from EPA) then you have the Tesla getting 50.91 MPG equivelant CO2 pollution. Note that hybrid vehicles and diesels both come close to or exceed this value making the CO2 pollution for a pure electric not as rosy as some have been led to believe.

Note that this is bested by emissions from diesel vehicles at this point. Untill fission or fusion or solar or whatever comes on line, and given the cost of these vehicles, it dosent make sense. Even if the battery were somehow cheap *now* it still wouldn't make much enviornental sense over a efficent chemical fuel based design. the best bang for the buck, since CO2 polluters aren't all rich, is to utilize efficent fossil fuel vehicles

more than 4 years ago
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Tesla Roadster Breaks Distance Record For Electric Car

burtosis Re:The truth is available with high school physics (392 comments)

You neglect that electric vehicles cost several times what an efficent chemical vehicle costs. Given that the bulk of CO2 polluters aren't rich, you can get the best effect now with the best $ to effect approach. People can't afford the high monthly payments and would rather pay more for thier fuel (about 6x cheaper for electricity over gasoline).

Also, you may not be aware, but electric motors are well over a hundred years old and have had about the same gains as chemical engines. There haven't been any big changes in the last 20 years compared to batteries - which have had substantial change.

I did not say that enviornmentalsts did ban nuclear power, just that they 'wanted' to do it for enviornmental reasons we now know are not scientfically sound.

more than 4 years ago
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Tesla Roadster Breaks Distance Record For Electric Car

burtosis Re:The truth is available with high school physics (392 comments)

you just cant use that argument now, or for the next decade, or perhaps even for the next 20 years. Wish thinking about what might or is likely to be is not the same as stopping pollution *now* which is what anyone in the field of enviornmental science would say is necessary to make the most positive change now.

you want a quicker end to enviornmental change? Start the masses on efficent chemical power - it is the most cost effective solution for the next decade at least and this is easy to show scientifically.

We could solve so many of these problems if people used rationality, evidence and the scientific foundation provided to us through centuries of effort instead of emotion, hopefulness and 'good intent'. A good analogy is the 'enviornemntalists' who tried to get nuclear power banned, accelerating global climate change and radiological pollution (through coal byproducts).

more than 4 years ago
top

Tesla Roadster Breaks Distance Record For Electric Car

burtosis The truth is available with high school physics (392 comments)

I am always interested in the CO2 output of these pure electric vehicles. After all, right now we power most of the electric grid with coal and until that changes it dosen't make sense to wish or just assert what things out to be instead of just doing some simple research and high school physics calculations.

Let's look at the real data from the real sources...

According to Tesla motors official specifications the motor has a output of 248 peak horsepower (185kW) and 276 ft/lbs (375 Nm) of torque. Also, for full charge it takes "3.5 hours using the Tesla Motors Home Connector at 240 Volts and 70 amps" which for simplicity and because they have neglected to disclose the actual kwh of full empty to full charge at room temperature (capacity will degrade with use) lets assume is 3.5hrs * (240V * 70A) = 58.8 kwh. Most likely this is an overly conservative estimate because of the constant current constant voltage nature of charging lithium batteries. This is more important than battery capacity because it is the load the power plant feels to charge your car and is the important quantity of interest. This will take you 244 miles on average (from same site) of course flat straight stretches will get better but it is the average that is most important. Total is 58.8 kwh/ 244 miles or about .241 kwh/mile. You can do the math on charging, but it should be obvious at this point that it is much cheaper than gasoline since electricity costs from around 7-20 cents/kwh in the US depending on numerous factors.

Now go look at EPA official website for determining CO2 emissions (in the US) and you can see that generating one kwh gives you 7.18x10^-4 metric tons of CO2. In addition, they also state on the same page you generate 8.81*10-3 metric tons of CO2 per gallon gasoline.

Lets do some simple math. At .241 kwh/mi this gives you (.241 kwh/mi * 7.18x10^-4 metric tons CO2/kwh) = 1.73 x 10^-4 tons of CO2/mile. At 8.81 x 10^-3 metric tons of CO2/gallon (from EPA) then you have the Tesla getting 50.91 MPG equivelant CO2 pollution. Note that hybrid vehicles and diesels both come close to or exceed this value making the CO2 pollution for a pure electric not as rosy as some have been led to believe.

Note that this is bested by emissions from diesel vehicles at this point. Untill fission or fusion or solar or whatever comes on line, and given the cost of these vehicles, it dosent make sense. Even if the battery were somehow cheap *now* it still wouldn't make much enviornental sense over a efficent chemical fuel based design.

more than 4 years ago
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How Much Is Your Online Identity Worth?

burtosis Finally an independant price point tool! (199 comments)

I was totally overpaying for all that black market info. I went to my dealer and showed him the link, now I save 30%! Thanks Geik^H^H^H^H Symantec!

about 5 years ago
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Tolkien Trust Okays Hobbit Movie

burtosis One Trust to rule them all (325 comments)

One Trust to find them, One Trust to bring them all and in the darkness bind them...

Courtesy of Melkor Publishing Inc...

about 5 years ago
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Apple Blames 'External Forces' For Exploding iPhones

burtosis Exploding batteries? (383 comments)

There's an app for that! Seriously though, lithium polymer batteries *can't* explode since they have no metal canister to hold the outgassing pressure. They simply 'vent with flame'.

about 5 years ago

Submissions

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New research uncovers possible improvements in sol

burtosis burtosis writes  |  about 5 years ago

burtosis (1124179) writes "Challenging conventional wisdom, new research finds that the number of sunspots provides an incomplete measure of changes in the Sun's impact on Earth over the course of the 11-year solar cycle. The study, led by scientists at the High Altitude Observatory of the National Center for Atmospheric Research (NCAR) and the University of Michigan, finds that Earth was bombarded last year with high levels of solar energy at a time when the Sun was in an unusually quiet phase and sunspots had virtually disappeared. New analysis of climate change models suggests that while there is a strong scientific consensus that there is a man made environmental problem, are we spending enough money on research in order to justify efficiently funding efforts to ameliorate the problem? How do we deal with a serious problem over decades to centuries when our scientific consensus changes on a decades to yearly timeframe and how does that influence public support necessary for change?"
Link to Original Source
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World's climate could cool first then warm later

burtosis burtosis writes  |  about 5 years ago

burtosis (1124179) writes "According to this article Forecasts of climate change are about to go seriously out of kilter. One of the world's top climate modellers said Thursday we could be about to enter one or even two decades during which temperatures cool. "People will say this is global warming disappearing," he told more than 1500 of the world's top climate scientists gathering in Geneva at the UN's World Climate Conference. It makes one wonder if we, as a global society, really are spending enough money on global warming research to justify the efficient expenditure of resources and garner of support necessary to ameliorate the problem."

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