power generation

hi everyone...

can anyone explain to me why steam us used to drive turbines at coal power staions ... i mean why not use heated CO2 , nitrogen or helium or any other gas to drive the turbine ... in a coal power station water is boiled to produce steam and it's super heated to get rid of the wat

Pro/e Wildfire textbook recommendations

Ladies and gents, I've finally secured new employment after several months of kicking cans but the new employer uses Pro/E Wildfire and I have never used it. I'm very good with Solidworks and I have a passing knowledge of Inventor. I am looking for a textbook/tutorial that will allow me to get up to

UPDATE: Texas revisionist McLeroy on ABC | Bad Astronomy

[This is an update to my previous post, Texas conservatives screw history, so you should read that first to get your blood to a rapid boil before reading this.]

The Texas State Board of Education member Don McLeroy — creationist, antireality promoter, and stander-upper to experts — was interviewed on ABC TV’s Nightline program. Give this a listen, just in case you were thinking of cutting him a break… for whatever reasons I cannot fathom.

Yes, how magnanimous of the rich white men to allow women the vote, or to give the blacks equal rights!

[If the video doesn't load for you, go to the Nightline web page and click on Thursday's listing of Texas Textbook controversy, which should be up for a few more days.]

I have been active on Twitter today mocking the new textbook standards, and a handful of people have taken me to task thinking I was mocking all Texans. That’s ridiculous; I am clearly ridiculing the ten people on the Board who rammed this revisionist nonsense through… though you may feel free to expand that to the people who support them.

And to the commenters on my original post and elsewhere defending McCarthy because there were in fact communists in America: shame on you. Seriously, shame on you. What McCarthy did — and yes, it was a witch hunt — was directly opposed to all the ideals of this nation: free speech, liberty, presumed innocence until proven guilty, and many more. He was only able to ferret out a handful of so-called communists, but even if he had been 100% successful in his efforts what he did was an abomination for anyone in this country, let alone a seated Senator in the United States Congress. He engendered fear and suspicion, a paranoia and chilling climate from which it took years to recover. He betrayed precisely what he claimed to be trying to protect, and will stand as an object lesson for future generations on what happens when our system fails so utterly.

That is, he’ll stand as that lesson for those who will listen. Clearly, some people didn’t. It’s a crying shame that this includes a majority of the Texas State Board of Education, because now it’s entirely likely the lesson will be missed by a decade’s worth of schoolchildren, too.

Tip o’ the ten gallon hat to Robert Luhn of the wonderful National Center for Science Education for the link to the ABC interview.


Topic: 410A Refrigerant In General Repairs

Question for discussion; If you are to look at a Hvac system that holds 12#'s of 410A and you determine by all readings taken that the system has lost some of its charge and is not cooling properly and you investigate and find a leaky seal at the brass fitting on the indoor Txv that was not tightene

Phone Pi | Cosmic Variance

Today is the much celebrated pi-day . Ok, perhaps it’s not that big a holiday – I don’t think Hallmark is selling any pi-day cards yet – but anyone who uses google today knows that something mathematical and geeky is being honored. I promise not to go into diatribes about calculations of the first few million digits of pi, or how many digits one needs to keep in order to calculate the radius of the universe to atomic accuracy. Instead, I merely want to relay a simple short story a colleague of mine recounted to me years ago.

Several years ago, before pi-day was famous, a student called the phone number associated with the digits in pi that appear after the decimal point, i.e., 1-415-926-5358. Apparently this is rather common now, and in fact, appears to be promoted as a mnemonic for the first 10 decimal places for those folks we need to have those numbers handy at all times. But this story happened in earlier times, back before the Bay Area split into several area codes. And, as the clever reader has already guessed, that student reached the SLAC main gate. How cool to phone pi and reach the main gate of a major national scientific research laboratory!

Alas, time and phone numbers march on, and nowadays phoning pi yields a “your call cannot be completed as dialed” message. (And I’m told that I cannot publish this post without noting that 3-14-15 will be a more accurate pi day.)


Marine gearbox TWIN DISC MG5061A no forward

I have an issue with a TWIN DISC Marine Gear Box in a very remote island location. When shifting it to forward it doesn't transmit the engine power to the propeller. I tried to service it and only at the dock with low rev's it pushes the boat forward in that position. Once in the open power lacks c

Big Slip for STS-131?

Valve problem threatens to delay April shuttle launch, Spaceflgihtnow.com

"Engineers familiar with the system said the valve cannot be directly serviced at the launch pad. If the problem cannot be resolved by indirect methods or development of an acceptable flight rationale, the only option would be to roll Discovery back to the Vehicle Assembly Building, detach it from its external tank, haul it to its processing hangar and remove the OMS pod for repairs or replacement."

Minnesota Tea Party activists rally to Kill the Bill

Outside the State Capitol on Saturday

Over 4,000 rally against Obama Care.

"This is dictatorial what they are planning to do..." -- Michele Bachmann

Others in attendence included HotAir.com Editor and "libertaian-conservative" Ed Morrissey and libertarian-leaning Republican candidate for Minnesota Governor Tom Emmer.