Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror

Comment Re:Died of a stroke (Score 1) 73

Backpressure itself doesn't create or support the pressure waves. Backpressure is a negative side-effect of containing the existing pressure waves in a pipe in order to create constructive interference. Pressure waves are generated by the exhaust valves opening. Constructive interference is a product of these generated waves either merging with waves from adjacent pipes, or reflecting from the open end of a pipe. The optimal tuned exhaust is designed such that the advantage from the constructive interference exceeds backpressure by a maximal amount at some critical engine speed.
Once you get past the collector and/or crossover pipe, any backpressure you add by way of restriction only serves to reduce flow efficiency. The lower you can make backpressure the better. There's a reason race cars have as short an exhaust as possible. On a naturally aspirated car ideally a tuned header ending shortly after the collector, but they usually have a pipe and muffler due to sound regulations.

Comment Re:Trump set Canada up here (Score 1) 96

Not at all. Canada does not have nukes. For nukes you have to have a delivery method. We don't have a delivery method. No ICBMs, no cruise missiles, not even the launch capability for cruise missiles. If Canada had nukes we would make them known to the world because they are a bargaining chip.

Comment Re:Meh. M. E. H. Meh. (Score 1) 128

small vacuum tubes are already used by banks, they work well.

add in a maglev train and this becomes worthwhile.

The hyperloop is not a cheap project, but it might be affordable
in comparison vs. a atmosphere very slowly becoming like venus.

At some point with Maglev and no friction due to it being a vacuum tube
the energy savings are going to make it worthwhile.

Research what the total cost of all the commercial airline fleets are,
adding in their fuel costs, maintenance costs, etc etc...

Comment Re:Meh. M. E. H. Meh. (Score 1) 128

Robot landers have been to mars, need to make robots that can repair each other and 3d print new parts.

Once you get self repairing robots sent to mars they can mine out a radiation free tunnel system.

Once it has a underground greenhouse established, human survival is viable there long term.

I'd make separate tunnel systems to avoid the "all eggs in one basket" issue.

For power on mars I lean towards a LFTR reactor as tested at ORNL in the 1960's.

I think they proved sub surface water on mars so that solves that.

I think if we took 10% of the warfare budget it would EASILY be done.

https://nssdc.gsfc.nasa.gov/nm...

Done for 4,000 times less then the F-35 funny enough.

Comment Re:The art of wasting the most resources (Score 1) 221

The energy lie is a popular one, but a lie none the less.

Geothermal:
https://en.wikipedia.org/wiki/...

Solar: ( solar thermal has less industrial waste )
https://en.wikipedia.org/wiki/...

Ocean currents:
https://en.wikipedia.org/wiki/...
http://www.smh.com.au/articles...

Jet Stream power: ( 1% would replace all other forms of power on earth )
https://en.wikipedia.org/wiki/...

Liquid Fluoride Thorium Reactor:
https://www.youtube.com/watch?...

ran safe, tested fail safe via freeze plug for 6,000 hours @ ORNL in the 1960's
not adopted due to extreme difficulty in weaponizing byproducts
one byproduct is Pu-238 which is in high demand for RTG application in space
this liquid non-rod based reactor design allows for consumption of 90% of nuclear waste
and turned into usable electrical power

Algae based oils:
https://www.youtube.com/watch?...

Most people now realize the political world is a blizzard of bullshit, now you
can realize it extends a bit beyond that.

Comment Re:Trading on fluctuations (Score 1) 221

There is a thing called the volatility index, some traders follow it and base their investing off it.

Some have the idea its bad, some have the idea its good, and 3rd set sees any kind of movement they can "hedge"
as potential for "churn" and they make their money off that.

So its all depend on your approach to fleecing the masses.

Comment Re:Forget Bitcoins... (Score 1) 221

GPU's were used for bitcoin for awhile, but then fell to FPGA's, and then to ASIC's at present.

The Antminer S9 at 14Terahash is the current power vs. hash king.

You can do GPU mining of Ethereum and do well, but it is diminishing in returns daily.

Also it requires a GPU with a large amount of oncard RAM, most are using 8GB vid cards.

Did a bit of research on coin mining recently and roped in a few friends to help,
and that is the combined key takeaways we found.

I am sure there is a fair bit we missed, but those seemed of primary concern to us.

Slashdot Top Deals

"Just the facts, Ma'am" -- Joe Friday

Working...