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September 06 2010 20:21:49

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Superconductivity

A YBCO Mystery
Calcium Doping YBCO...

Events

BBC news

Blair in climate inaction warning
Former UK Prime Minster Tony Blair warns world leaders they may pay a heavy price in history if they fail to tackle global warming.

Hubble re-shoots 1987 star blast
The Hubble space telescope returns to view one of its favourite subjects - a giant stellar explosion first seen from Earth in 1987.

Danish rocketeers postpone launch
A group of Danish rocket enthusiasts trying to launch a dummy 30km into the sky abort the mission when a valve on their rocket freezes up.

Tiny solar cells fix themselves
A mix of chemicals borrowed from plants with tiny tubes of carbon can spontaneously create tiny, self-repairing solar cells.

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.

Island 'super-sized' mice studied
Researchers begin a study of the "super-sized" mice found on a tiny Scottish island in the Outer Hebrides.

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.

Amateur Telescope Making

Re: Soundstepper is working!
Thanks Roger, I'll see if I can understand the material in the link--still kinda hazy. Gary

Re: Soundstepper is working!
Thank You Roger! The current controller try to mantain the current (on step motor windings) always proportional to voltage of USB audio device output,

Re: Soundstepper is working!
Hi Gary Maybe I can help. SoundStepper uses UBB audio devices to output sine waves to drive stepper motors. The USB audio drive's an audio power IC. The

Re: Soundstepper is working!
Hi Maciel I also would like to know how this works. I have built Mel Bartel's scope and PICGOTO. This is very interesting Stephen

Re: Soundstepper is working!
Hi Maciel, I looked at the link...could you explain how it works as simply as possible! Particularly, what is an "external analog current amplifier"? Thanks,

Re: Soundstepper is working!
Hi Maciel Excellent! I am happy for your success! I have built two controllers and I plan to build a split-ring mount. No focus. I will let you know how it

Soundstepper is working!
Success! No more I lose 30 minutes or more trying to find a 16th magnitude comet or asteroid in the sky! Using latest version of Soundstepper, even with my

Ball and Socket travel scope and Guide Pin Focuser Models on display
A generous display of images of the 6" F-4 open truss travel scope and it's ball and socket mount can now be viewed at the ScopeMechanix group here at Yahoo.

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

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