Next Foldoc Entry to Edit: Josephson junction

Josephson junction

A Josephson junction is a type of electronic circuit capable of switching at very high speeds when operated at temperatures approaching absolute zero. Named for the British physicist who designed it, a Josephson junction exploits the phenomenon of superconductivity, the ability of certain materials to conduct electric current with practically zero resistance. Josephson junctions are used in certain specialized instruments such as highly-sensitive microwave detectors, magnetometers, and QUIDs.



A Josephson junction is made up of two superconductors, separated by a nonsuperconducting layer so thin that electrons can cross through the insulating barrier. The flow of current between the superconductors in the absence of an applied voltage is called a Josephson current, and the movement of electrons across the barrier is known as Josephson tunneling. Two or more junctions joined by superconducting paths form what is called a Josephson interferometer.



While researching superconductivity, Brian David Josephson studied the properties of a junction between two superconductors. Following up on earlier work by Leo Esaki and Ivar Giaever, he demonstrated that in a situation when there is electron flow between two superconductors through an insulating layer (in the absence of an applied voltage), and a voltage is applied, the current stops flowing and oscillates at a high frequency.



The Josephson effect is influenced by magnetic fields in the vicinity, a capacity that enables the Josephson junction to be used in devices that measure extremely weak magnetic fields, such as superconducting quantum interference devices (SQUIDs). For their efforts, Josephson, Esaki, and Giaever shared the Nobel Prize for Physics in 1973.

A superfast switch used in many computers. It consists of a thin layer of insulating material sandwiched between layers of superconducting material.

Consists of two superconductors separated by a thin insulating barrier. Is in fast electronic switches or sensitive magnetometers.

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As before, welcome for discussion.



So need to Submit by June 28 to FOLDOC (But,I guess I would be sooner this time, since... I would like to :)

Extensible Programming for 21st Century

Read this article about Extensible programming for 21st century. It gives a programming model of the future, while analysing the so far existant programming models.

this was a good read to know more abt these models.

Will visit again some day.

Programmers and Builders

If the builders built building the way programmers wrote programs,

then the first woodpecker to come along would destroy civilization.

The C Programming Language and the Rest

I am still styding the C Programming Language Book. My aim is to complete the book ( with a good number of iterations) and solve all the problems in the book.

At the end of it, I have to write a small editor.

After this is completed, I have to give my RHCE exam.

For the 11th hour preparation for RHCE, I came across thid link today,posted in our internal groups.

But,priority to the C Learning First.

Andy Tanenbaum,

in his characteristic way, has some interesting thing here.

And here is a followup equally amusing.

clause - FOLDOC Entry

clause	

        1.  A {logical formula} in {conjunctive normal form},

         which has the {schema}

			 p1 ^ ...^ pm => q1 V ... V qn.

	or,equivalently

			~p1 V ... V ~pn V q1 V ... V qn,

	where pi and qi are {atoms}.

	The operators ~,^,V,=> are connectives,where ~ stands for a	                            

        {negation},^ for a {conjunction},V for a {disjunction} and =>

 	for an {implication}.



	2.  A part of a {SQL} statement that does not	constitute

        a full statement; for e.g. a "WHERE clause".

	(2004-5-15)

Was sent to me on Apr 7, took a little extra time to edit.



Thanks FOLDOC

copy and paste in vim

Now, this was stupid. I had not figured out how to do copy-paste in vim editor.

At last now, I got it. Thanks to google and Linux Novice

HOWTO Copy and Paste in VIM Editor.

These Steps Assume you are in the Command Mode.

Step 1: Move your Cursor to the Starting Point of the text tobe Copied .

Step 2: Press v. The Mode changes to Visual.

Step 3: Move your Cursor now to the Ending point of the text tobe Copied.

Step 4: Press y This will copy the text in the buffer and lead to the starting point again.

Step 5: Move your Cursor to the position where you want to paste the text.

Step 6: Press p



YO!

The Logic Behind being Crazy

Most real innovation is done by crazy people doing crazy things. The keys are:



Learn all you can before you go adventuring.

Don't be afraid to make mistakes.

Only make new mistakes.

Keep your eyes open.

Don't just look straight ahead: develop your peripheral vision.

It's the things that go in unexpected directions are the most important.



James Gosling in his Java Blog