AWS D17.1 Welding Specs

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I'm very new to the field of welding (2 weeks) and need help. I'm trying to help write (or buy) welding procedures (WPS) in accordance with AWS D17.1 (aerospace welding) for a tube groove (6G) weld using aluminum (6061), GTAW. I have found lots of WPS in accordance with D1.1 or D1.2, but those spec

Pneumatic Cylinders

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I have a pneumatic cylinder that bangs when extended and vibrates the machine. Where can I find cylinders that have a biult in damper as to not decrease speed of the cylinder but when the piston is at extension as to minimize the "bang".

Thank you,

Tom

NGR Grounding in Alternator

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Dear members,

i am in 12.5 MW,4.16KV cogen thermal power plant, we are step up the power through 16 MVA transformer to 69 KV.in 12.5 MW we are closing the NGR only at time of synchronising only, after synchronising we are opening the NGR. IN the step up transformer , the NGR is always close

Partial Differential Protection Scheme for Bus Bars

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Please throw some light on partial differential protection scheme used for Medium Voltage (6.6/11 KV ) Bus Sections ,where CTs of Incomers/Tie Feeders & Bus Couplers of the relevant Bus Sections are connected in the scheme (ie. CTs of Outgoing Feeders are not in the scheme).

1.How does it

An Editorial That Is NOT Written By A Moon Walker

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This Is No Time to Retire Shuttle, OpEd, Mike Snyder, Space News

"I am not a government employee, the CEO of an aerospace company or even senior management. I am an engineer, one of the tens of thousands of people around this nation who work daily on our efforts in space. In six months, the United States will retire the space shuttle, the most robust and capable space vehicle the world has ever seen, simply because our government has decided to do that. We have no vehicle to replace the space shuttle, and we will have no replacement for an unspecified amount of time."

Climate change attacks followup | Bad Astronomy

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earthonfireLast week, I wrote about a second investigation clearing climate change scientists from any wrongdoing in the horrid manufactured controversy of climategate. In that post, and an earlier one, I mentioned that Virginia State Attorney General Ken Cuccinelli was starting a witch hunt, investigating the work of scientist Michael Mann while he was at the University of Virginia. Cuccinelli’s actions are transparently driven by political bias; Mann has been shown repeatedly to have worked honestly and above-board.

I’m not the only one who thinks that. Chris Mooney at The Intersection has quotes and links from a scathing Washington Post editorial, condemning Cuccinelli for his actions. And the Post doesn’t hold back, even calling UVa out, telling them to get a spine and stand up to this attack. Chris put up a second post about how scientists themselves have picked up this banner. Oh, and here’s a third post about the AAAS condemning Cuccinelli as well.

Ironically, Cuccinelli claims his investigation is because he thinks tax money was wasted or that Mann defrauded the tax payers… but it’s Cuccinelli’s investigation that’s the true waste of taxpayer money. This attack by him started after Mann was already exonerated, making Cuccinelli’s motives pretty clear. Oh, did I say "ironically"? I meant Orwellian.

On top of the Washington Post’s call, over 250 members of the National Academy of Sciences — the U.S.’s premier and most prestigious organization for science — have publicly condemned these attacks as well:

Many recent assaults on climate science and, more disturbingly, on climate scientists by climate change deniers, are typically driven by special interests or dogma, not by an honest effort to provide an alternative theory that credibly satisfies the evidence.

I couldn’t have said it better myself. I urge everyone to read both the WashPo article and the full statement by the NAS.

And for you deniers who plague the comments of every blog post I make on this topic, loading it with obfuscation, noise, and distraction from the actual topic: these posts by me are not politically driven. In fact, given the opportunities for new businesses and new technology, preventing global climate change should be a major plank of the Republican Party, which claims to stand for such things.

So instead of blindly assaulting me with trivially ridiculous accusations, you might want to examine the motivations behind the political attacks on real science. Many of you claim to be skeptics. Well then, be skeptical, but be real skeptics. I am, and always have been — I’ve examined the claims, the science, and the techniques, and have come to the conclusion that global warming is real, and that humans are overwhelmingly the most likely cause of its recent acceleration.

I know I can say this all I want and it won’t help; the Noise Machine is impervious to logic and reality. But when you read those comments, you might want to keep this image in the back of your mind:

lalalala_ottercanthearyou


Electric Vehicle Information

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I am building some scooters for my Grandkids and I would like to install electric powered motovation,

Can anyone assist me in this endeavor?

I am also interested in how the electric automobile works.

Thanks in advance.

Of Hurricanes and Oil | The Intersection

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The Atlantic hurricane season begins June 1, and forecasts suggest an above average year. And as we all know, Atlantic hurricanes are deadliest when they get into the warm Gulf of Mexico. It is almost like a hurricane jumping on a trampoline. They can go from Category 1 to Category 5 in 24 hours in such a favorable environment. But this year, as we also know, there is something different about the Gulf. It is full of oil. What are the implications of this fact for hurricanes? And conversely, what might a powerful hurricane do to the oil spill if it were to run across it? This is a topic I've been thinking about, and I don't have definitive answers yet. I'd like to do more research and interview some experts--but for now, let's take a rough and dirty approach to the issue, based on what is already out there. And let's tackle the first question first: What would an oil slick do to a hurricane? According to storm ace Jeff Masters, the answer is not very much. Here's what Masters is thinking. It's certainly true that oil on the surface of the ocean could inhibit a hurricane's access to its fuel source--the warm seawater ...


Youtube Videos

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Earlier we used to copy URLs and download videos from youtube. Recently youtube has removed the URLs from it pages. Any other option to download our favourite programs? anyother similar website from where we can download good educational videos?

Regards,

PG

Control Room Air Conditioning

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What are the major specification of control room air condition?

Is that true that the ordinary split unites does not provide the necessary positive pressure in the control so we must use central air condition ?

Using orifice plate for minimum flow protection

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Why / what would be the reason for you to use an orifice plate for minimum flow protection for a pump? Since the discharge side always has a higher pressure, the discharge fluid will keep on flowing through the orifice plate until the delta P is zero (meaning a big increase in suction head), basical

Calculate heat loss in stainless steel piping

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People,

I have a request please. Does anyone have any experience in calulating heat loss in stainless steel water pipes? I have looked at Newtons law of cooling and Fouriers law but I don't think they apply to my situation. I know that forced convection heat loss applies due to the pump.

P

Chickens are like people | Gene Expression

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In that their demographic history is complicated. The Origin and Genetic Variation of Domestic Chickens with Special Reference to Junglefowls Gallus g. gallus and G. varius:

… domestic chickens diverged from red junglefowl 58,000±16,000 years ago, well before the archeological dating of domestication, and that their common ancestor in turn diverged from green junglefowl 3.6 million years ago. Several shared haplotypes nonetheless found between green junglefowl and chickens are attributed to recent unidirectional introgression of chickens into green junglefowl. Shared haplotypes are more frequently found between red junglefowl and chickens, which are attributed to both introgression and ancestral polymorphisms. Within each chicken breed, there is an excess of homozygosity, but there is no significant reduction in the nucleotide diversity. Phenotypic modifications of chicken breeds as a result of artificial selection appear to stem from ancestral polymorphisms at a limited number of genetic loci.

I wonder if domesticates in particular exhibit these more complex reticulated patterns in their phylogenies because they spread along human trade routes.