Slashdot is powered by your submissions, so send in your scoop


Forgot your password?

Comment Re:Typical electric car consumes 35 kWh per 100km (Score 1) 396

Typical electric car consumes 35 kWh per 100km. (62 miles)

The Tesla Model S easily gets 400km out of 85kWh which puts it at ~20kWh per 100km.

Say it can drive 400km (250 miles). That's 140 kWh of energy.

85kWh for the Model S

Now, to pump 140 kWh in 15 mins, one needs electircity source of 560 kW.
Typical "big" power plants with several blocks are normally in 1-1.5GW area.
With about 2500 such vehicles you'd consume 100% of power generated by such power plant.

Only if all cars always simultaneously drive 400km in 15 minutes and also charge at full capacity during those 15 minutes, and they do this continuously 24/7. This is a practical impossibility for a number of reasons.

Even if you suppose that all cars drive 400km per day (which isn't the case) and so need a full charge every day, a smart grid would distribute those 2500 cars out such that 26 charge at a time (26 x 4 x 24 = ~2500 cars) and you only need a 9MW energy supply for the 2500 cars with the Model S 85kWh battery. (In practice cars drive a lot less than this and so when all is said and done you don't need a whole lot of electricity at all to keep them going.)

Comment Re:One of the "example" solutions (Score 1) 142

They acknowledge right at the start that whatever you propose could easily be defeated by the consumer simply encrypting things themselves. So if the entire thing is technologically unfeasible why on earth would you even study it?

It makes sense as a first step towards a total solution. It will be massively imperfect but you've got to start somewhere and over a 20-30 year period of refinement and expanding the scope you might actually get to where you want to be.

The one thing I haven't seen covered in the paper at all is that IF the US were to implement these requirements that all business involved in encryption would simply move off shore and destroy a thriving US business ecosystem. The paper's assumption is that any US developed protocol would then be exported world wide. This is profoundly illogical on many fronts. There would be numerous countries that would simply not participate in some US encryption compromising ring.

This could only work if done at an international level. You absolutely must have the major economic blocs (Europe, Russia, China etc.) on team with it, and preferably also the major "new" economies. The rest will naturally follow. Actually generating this international consensus will be a difficult task but they're finally doing it with personal finance so there's no reason to think they couldn't do it with digital communication. Again, 20 years of constant pushing and making the best use of every crisis can get you a long way.

Comment Re:I predict the future of a government API (Score 1) 142

The result of this is that even is some key recovery system is mandated users could simply encrypt their own data underneath the compromised encryption and render the device inaccessible and defeat the entire purpose of the law and international accords.

If this is made illegal though most people will be disinclined towards doing it, and those that still do it can be sent to prison for that at least even if you can't figure what else wrong they may have done.

There's a million crimes in this world any one of us can commit any day (and probably get away with), yet because they are illegal most people don't. This will be another one of those.

Comment Chess (Score 1) 69

Someone should write a chess program that communicates its moves to the other players via the blockchain.

As these things always develop, before long there will be a feature to read and send email from this chess program, also via the blockchain.

Then this should gradually evolve into an IP over blockchain standard. Then everything can use the blockchain.

Comment Re:Why? Sexbots could be great! (Score 1) 536

Objectifying a woman-shaped sexbot will only train men (or women) to objectify women.

You're not seeing the long picture here.

Once we have trained people to desire sexbots, we can start slowly morphing the sexbots away from looking like women (or men for that matter) and over to some other form entirely. In the end, when the sexbots look completely non human like, we will have trained men to feel no sexual desire to woman-shaped forms at all and everyone wins!

Comment Re:Slower, Same range, within 5 years?!? (Score 1) 213

A couple of DAYS between SF and the Oregon border?

I have no idea how far this is, but that is also not relevant.

If Tesla has superchargers along your route then essentially your Model S drives for 4 hours then charges for 20 minutes before repeating the cycle. It can keep doing this 24/7 for however long you need it to. What will usually stop you is tired drivers or having reached your destination.

This summer I did a 12 hour drive with a Model S covering about 800km, which includes ~2h of stops wasted on feeding the humans. (That may seem like slow going but that's Norwegian speed limits for you.)

Comment Re:Gamers are dead. (Score 1) 239

And, of course, streaming and "let's plays." Why are people sitting around watching OTHER PEOPLE play games that they themselves could be playing? But they do!

I'm too busy playing games to play games. Instead I have on in the background while I play games.

Does this make me less of a gamer, or more of a gamer, than were I just playing games on my own?

Comment Re:A Sympton of the Problem (Score 1) 310

They are right in the effect. However, you never see anyone take it to the next step. Do we NEED to market to be THAT liquid?

We can't really know the answer to this. The applications that would benefit from instant liquidity haven't been developed because instant liquidity has not been available.

Maybe there are some true killer applications for this that just need a few more years of HFT-provided instant liquidity for someone get around to inventing, and once they do, we'll all wonder how people could even pay their bills under the old system let alone live their lives to the full.

Comment Re:Heisenberg compensator ... (Score 1) 83

To me, the weird thing is the notion that you could live in an N dimensional universe yet only be able to interact with N-1 of its dimensions.

The 2D person who cannot perceive up and down: both up and down are there and they produce various forms of inputs to the 2D world so how could he possibly not observe them?

What it is about the Nth dimension that makes it fundamentally impossible to observe directly?

With this concept being so weird it doesn't really explain anything for me wrt QM, it just adds a new question.

Comment Re:Of course it is ... (Score 1) 224

TSA is a place where money goes to be spent on the premise that spending money on things which do nothing is better than doing nothing, even if the outcomes are the same.

It that were only the case it wouldn't be so much of an issue.

One billion dollars of pork is just one billion dollars of pork: payouts to the friends of the king, business as usual.

But what they are in fact doing is spending that one billion in order to make the entire rest of the economy less efficient. They are spending one billion so they can make sure another 100 billion is lost or never produced that otherwise would have been.

The one billion isn't the problem, the one hundred is.

Last yeer I kudn't spel Engineer. Now I are won.