Skip to main content

If this is it...

100 Years of Superconductivity, Professor James Annett
BRLSI (IOP South West Branch) 6th May 2011

Prof Annett graduated from Cambridge and completed post doctorate studies in Illinois before moving to Bristol in 1994 as a lecturer.

1897   JJ Thompson discovered electron
1900   Mark Plank quantum physics
1905   Albert Einstein and the photo-electric effect, special relativity and Brownian motion
1908   H Kamerlingh Onnes liquefied helium at 3 degrees Kelvin
1987   James Dewar liquefied hydrogen

Superconductors expel ALL the magnetic field, they are perfect diamagnets.

BCS Theory solved in 1956 which explains such things as ‘coherent states’.
Þ    Electron-lattice attraction near Fermi momentum (Energy level)
Þ    Leads to Cooper Pairs of electrons
Þ    Near band gap energy (The conduction band electrons are all paired up)

‘Gauge symmetry’:
Ø  Not as would be expected from nature
Ø  Nature NOT symmetrical (!?!)
o   Leads to theorized Higgs boson

1986 the Tc (critical temperature for superconductivity) first breached the theorized limit of 30K from BCS theory (new types of superconductor invented).

[Random thought: Bionic implant for the eye to assist in eye focussing.]

Binding energy for superconductors attached to magnets
Ø  (There are three different mechanisms depending on type of superconductor.)
o   doping diagram of superconductivity being affected by alloy being doped

Uses of superconductors in the current world:
·      Superconducting power grid
o   High density of current
o   REAL TECHNOLOGY
·      Superconducting motors
·      Computing

What to expect?
·      Possibly reach room temperature superconducting

[Random thought: People must intimidate each other for having good eye-sight in the West generally but this trend is now being reversed and it can be seen that people wearing glasses are now facing the threat of violence for being short-sighted]

The optical properties of superconductors are mainly in the infrared so far (via interaction with Cooper pairs of electrons for bullshit example).

·      Possible application in bionic eye implant as a focussing sensor for the eye.

Comments

Popular posts from this blog

Camden Crescent and Hedgemead Park

Here are my thoughts: Did you know that Camden Crescent, originally Camden Place and Upper Camden Place (which is now round the corner) was named after the Earl of Camden, Charles Pratt, who was Chancellor of the Exchequer so sponsored the scheme with his symbol on every door and crest of the exchequer on the decoration at the centre of the crescent? Charles Pratt was actually lord of Camden Place in Chislehurst in Kent. He was mates with William Pitt the Elder from Eton and Cambridge days. It was built 1788-1792 by John Eveleigh the architect.  One third of the 22 house crescent collapsed during a landslip which claimed 136 houses on the slopes of Lansdown Hill leading to the creation of Hedgemead Park below Camden Crescent. John Eveleigh was notoriously bankrupted in Bath, being called to the coffee shop in the Bath Chronicle by his creditors. Earl Camden was famous for supporting Fox’s Libel Act of 1792 which said that libel should be tried as murder with a jury regarding the poin…

Housing Needs in House Search for Asperger’s Diagnosis

Essential requirements: ·Quiet away from traffic and flight path ·South facing windows for sunshine in the morning ·Triple glazing and proper A rated insulation ·Hedge and fence around property to block pollution A detached 2-bedroom property, 2 bathroom, 2 storey with attic and basement, study, dinning room, living room and kitchen with utility room, garage and small lawn all around property. Looking for something on a 10x10m plot with house on 8x8 m plan.

Things requested: ·Shower and a bath ·Air conditioning system with air filtration ·Tennis or squash court ·Swimming pool ·Vegetable garden ·Conservatory ·Solar panels ·UPS (uninterrupted power supply) device and battery backup ·22 foot high ceilings ·Detailed plastered finish ceiling ·Fireplace ·Security/blackout shutters ·Roof balcony

Criticism for the Tory Government in Britain

My criticism for Jacob Rees-Mogg and the Conservative Party would be from a financial perspective; the Tories have been poor on cost control and paying off stakeholders: extravagant wages and unpaid benefits bills. There have been no real compensation cases for human rights linked to the British education and qualifications system which is indicative of systemic failure at the grassroots. This means that there is a lack of opportunity for British people to do the work that they want to do; they are not being acknowledged. And a phoney social mobility scheme is propagating due to corporate culture being given precedence over British culture in public life.. I think the outlook could be negative for British finances with another credit rating downgrade for the UK, perhaps by two notches! My point is that it's the EU Pinkerton Agents getting the better of Tory government with Donald Tusk lording it over you from his office of power in the EU you won't get treated better in Europ…