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September 04 2010 14:17:19

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Superconductivity

A YBCO Mystery
Calcium Doping YBCO...

Events

BBC news

Plans for solar 'close encounter'
Nasa is aiming to get closer to the Sun than ever before, with plans to plunge a car-sized unmanned spacecraft into the star's outer atmosphere.

Reading Arabic 'hard for brain'
Israeli scientists believe they have identified why Arabic is particularly hard to learn to read.

Wolves fail to halt aspen decline
The re-introduction of wolves to a US National Park has not helped re-establish quaking aspens, as many researchers had hoped.

Technique to trace persistent CFCs
Ultrafine measurements of atmospheric gases could help scientists track down the last sources of CFCs thought to be slowing the recovery of the ozone layer.

Openness urged on UK's emissions
The government's chief environment scientist calls for more openness in admitting the UK's cuts in greenhouse gas emissions are an illusion.

'Lights out' help migratory birds
A growing number of New York sky-scrapers switch off their lights at night to help reduce the number of migratory birds hitting the buildings.

Ants protect trees from elephants
A species of acacia tree found in Eastern Africa seems to be protected from elephant damage - by the ants that live on it.

BP says oil spill cost up to $8bn
BP says the cost of its Gulf of Mexico oil spill has risen to $8bn - a rise of more than $2bn in the last month alone.

Amazon river level at 40-year low
The River Amazon has dropped to its lowest level in 40 years in north-eastern Peru, leaving boats stranded.

Memristor revolution backed by HP
A potentially revolutionary circuit component, once a laboratory curiosity, is to be mass-produced for the first time.

Amateur Telescope Making

Re: Ultra Portable 10"
Jack asked: "is it possible to make the clamp in rubber for more clamp power" Hello Jack! The clamp is a heavy gauge stamping with 2 concave depressions, each

Re: Gregorian Design
The secondary mirror of a gregorian is a concave prolate ellipse. An ellipse has two foci (as does a hyperbola). Light from the primary passes through its

Re: Gregorian Design
Is the secondary mirrror of the GREGORIAN not concave and usually 1/4 diameter of the primary and placed behind the paraboloid primary focal point. polished

Re: "Foucault Test Analysis" and "Couderma.exe"
Hello Vladimir, I do not yet have a good camera setup for the Foucault tester. It takes me longer to get one marginally good Foucault image than it does to

Re: Ultra Portable 10"
I have this product from dremmel http://www.dremel.com/en-us/Tools/Pages/ToolDetail.aspx?pid=2217 very good but discontinued maybe it is possible to made one

Re: Ultra Portable 10"
is it possible to make the clamp in rubber for more clamp power and easyer to mold jack 47'n 71'W Thank you Peter for the acknowledgement. That's nice to see

Re: "Foucault Test Analysis" and "Couderma.exe"
Ooops, just a small correction : goto http://hps.infolink.com.br/rdunna , if you want to change language Regards Ricardo Dunna Em 3/9/2010 00:02, Jerry wrote:

Re: "Foucault Test Analysis" and "Couderma.exe"
Jerry, I see that you are experienced Foucault test user. Therefore I would highly appreciate your opinion and comparison of the two possible approaches.

Ultra Portable 10" CORRECTION TO LINK
"AeroSpace Composites" is not accurate. The name is "Aero Space Parts Composites" Here is the link to their on-line store:

Re: "Foucault Test Analysis" and "Couderma.exe"
Thanks Ricardo, I will give this a test drive. Jerry From: atm_free@yahoogroups.com [mailto:atm_free@yahoogroups.com] On Behalf Of Ricardo Dunna Sent:

Superconductivity

A YBCO Mystery
A YBCO Mystery Doping to Increase Resistive Tc Fails to Increase Magnetic Tc Novel reformulations by Superconductors.ORG, have seen the Tc of YBCO increase

Calcium Doping YBCO for Higher Tc
Calcium Doping YBCO for Higher Tc ... 14 April 2010 Superconductors.ORG ... Superconductors.ORG herein reports the discovery of a second calcium-doped YBCO