Wednesday, October 21, 2009

Stay Hungry Stay Foolish - Famous Lecture by Steve Jobs of AppleMac

Steve Jobs Stanford Commencement Speech 2005

http://www.youtube.com/watch?v=D1R-jKKp3NA



This video is provided by Stanford University. Steve Jobs, co-founder of Apple Computer and Pixar Animation Studios addresses the Stanford graduates about staying true to your dreams, never giving up and doing what you love. This speech is truly inspiring

Stanford Report, June 14, 2005

‘You’ve got to find what you love,’ Jobs says


This is the text of the Commencement address by Steve Jobs, CEO of Apple Computer and of Pixar Animation
Studios, delivered on June 12, 2005.
I am honored to be with you today at your commencement from one of the finest universities in the world. I never
graduated from college. Truth be told, this is the closest I’ve ever gotten to a college graduation. Today I want to tell
you three stories from my life. That’s it. No big deal. Just three stories.
The first story is about connecting the dots.
I dropped out of Reed College after the first 6 months, but then stayed around as a drop-in for another 18 months or so
before I really quit. So why did I drop out?
It started before I was born. My biological mother was a young, unwed college graduate student, and she decided to
put me up for adoption. She felt very strongly that I should be adopted by college graduates, so everything was all set
for me to be adopted at birth by a lawyer and his wife. Except that when I popped out they decided at the last minute
that they really wanted a girl. So my parents, who were on a waiting list, got a call in the middle of the night asking:
“We have an unexpected baby boy; do you want him?” They said: “Of course.” My biological mother later found out
that my mother had never graduated from college and that my father had never graduated from high school. She
refused to sign the final adoption papers. She only relented a few months later when my parents promised that I would
someday go to college.
And 17 years later I did go to college. But I naively chose a college that was almost as expensive as Stanford, and all
of my working-class parents’ savings were being spent on my college tuition. After six months, I couldn’t see the value
in it. I had no idea what I wanted to do with my life and no idea how college was going to help me figure it out. And
here I was spending all of the money my parents had saved their entire life. So I decided to drop out and trust that it
would all work out OK. It was pretty scary at the time, but looking back it was one of the best decisions I ever made.
The minute I dropped out I could stop taking the required classes that didn’t interest me, and begin dropping in on the
ones that looked interesting.
It wasn’t all romantic. I didn’t have a dorm room, so I slept on the floor in friends’ rooms, I returned coke bottles for the
5¢ deposits to buy food with, and I would walk the 7 miles across town every Sunday night to get one good meal a
week at the Hare Krishna temple. I loved it. And much of what I stumbled into by following my curiosity and intuition
turned out to be priceless later on. Let me give you one example:
Reed College at that time offered perhaps the best calligraphy instruction in the country. Throughout the campus every
poster, every label on every drawer, was beautifully hand calligraphed. Because I had dropped out and didn’t have to
take the normal classes, I decided to take a calligraphy class to learn how to do this. I learned about serif and san serif
typefaces, about varying the amount of space between different letter combinations, about what makes great
typography great. It was beautiful, historical, artistically subtle in a way that science can’t capture, and I found it
fascinating.
None of this had even a hope of any practical application in my life. But ten years later, when we were designing the
first Macintosh computer, it all came back to me. And we designed it all into the Mac. It was the first computer with
beautiful typography. If I had never dropped in on that single course in college, the Mac would have never had multiple
typefaces or proportionally spaced fonts. And since Windows just copied the Mac, its likely that no personal computer
would have them. If I had never dropped out, I would have never dropped in on this calligraphy class, and personal
computers might not have the wonderful typography that they do. Of course it was impossible to connect the dots
looking forward when I was in college. But it was very, very clear looking backwards ten years later.
Again, you can’t connect the dots looking forward; you can only connect them looking backwards. So you have to trust
that the dots will somehow connect in your future. You have to trust in something — your gut, destiny, life, karma,
whatever. This approach has never let me down, and it has made all the difference in my life.
My second story is about love and loss.
I was lucky — I found what I loved to do early in life. Woz and I started Apple in my parents garage when I was 20. We
worked hard, and in 10 years Apple had grown from just the two of us in a garage into a $2 billion company with over
4000 employees. We had just released our finest creation — the Macintosh — a year earlier, and I had just turned 30.
And then I got fired. How can you get fired from a company you started? Well, as Apple grew we hired someone who I
thought was very talented to run the company with me, and for the first year or so things went well. But then our
visions of the future began to diverge and eventually we had a falling out. When we did, our Board of Directors sided
with him. So at 30 I was out. And very publicly out. What had been the focus of my entire adult life was gone, and it
was devastating.
I really didn’t know what to do for a few months. I felt that I had let the previous generation of entrepreneurs down - that
I had dropped the baton as it was being passed to me. I met with David Packard and Bob Noyce and tried to apologize
for screwing up so badly. I was a very public failure, and I even thought about running away from the valley. But
something slowly began to dawn on me — I still loved what I did. The turn of events at Apple had not changed that one
bit. I had been rejected, but I was still in love. And so I decided to start over.
I didn’t see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to
me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about
everything. It freed me to enter one of the most creative periods of my life.
During the next five years, I started a company named NeXT, another company named Pixar, and fell in love with an
amazing woman who would become my wife. Pixar went on to create the worlds first computer animated feature film,
Toy Story, and is now the most successful animation studio in the world. In a remarkable turn of events, Apple bought
NeXT, I returned to Apple, and the technology we developed at NeXT is at the heart of Apple’s current renaissance.
And Laurene and I have a wonderful family together.
I’m pretty sure none of this would have happened if I hadn’t been fired from Apple. It was awful tasting medicine, but I
guess the patient needed it. Sometimes life hits you in the head with a brick. Don’t lose faith. I’m convinced that the
only thing that kept me going was that I loved what I did. You’ve got to find what you love. And that is as true for your
work as it is for your lovers. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to
do what you believe is great work. And the only way to do great work is to love what you do. If you haven’t found it yet,
keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it. And, like any great relationship,
it just gets better and better as the years roll on. So keep looking until you find it. Don’t settle.
My third story is about death.
When I was 17, I read a quote that went something like: “If you live each day as if it was your last, someday you’ll most
certainly be right.” It made an impression on me, and since then, for the past 33 years, I have looked in the mirror
every morning and asked myself: “If today were the last day of my life, would I want to do what I am about to do
today?” And whenever the answer has been “No” for too many days in a row, I know I need to change something.
Remembering that I’ll be dead soon is the most important tool I’ve ever encountered to help me make the big choices
in life. Because almost everything — all external expectations, all pride, all fear of embarrassment or failure - these
things just fall away in the face of death, leaving only what is truly important. Remembering that you are going to die is
the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no
reason not to follow your heart.
About a year ago I was diagnosed with cancer. I had a scan at 7:30 in the morning, and it clearly showed a tumor on
my pancreas. I didn’t even know what a pancreas was. The doctors told me this was almost certainly a type of cancer
that is incurable, and that I should expect to live no longer than three to six months. My doctor advised me to go home
and get my affairs in order, which is doctor’s code for prepare to die. It means to try to tell your kids everything you
thought you’d have the next 10 years to tell them in just a few months. It means to make sure everything is buttoned up
so that it will be as easy as possible for your family. It means to say your goodbyes.
I lived with that diagnosis all day. Later that evening I had a biopsy, where they stuck an endoscope down my throat,
through my stomach and into my intestines, put a needle into my pancreas and got a few cells from the tumor. I was
sedated, but my wife, who was there, told me that when they viewed the cells under a microscope the doctors started
crying because it turned out to be a very rare form of pancreatic cancer that is curable with surgery. I had the surgery
and I’m fine now.
This was the closest I’ve been to facing death, and I hope its the closest I get for a few more decades. Having lived
through it, I can now say this to you with a bit more certainty than when death was a useful but purely intellectual
concept:
No one wants to die. Even people who want to go to heaven don’t want to die to get there. And yet death is the
destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the
single best invention of Life. It is Life’s change agent. It clears out the old to make way for the new. Right now the new
is you, but someday not too long from now, you will gradually become the old and be cleared away. Sorry to be so
dramatic, but it is quite true.
Your time is limited, so don’t waste it living someone else’s life. Don’t be trapped by dogma — which is living with the
results of other people’s thinking. Don’t let the noise of others’ opinions drown out your own inner voice. And most
important, have the courage to follow your heart and intuition. They somehow already know what you truly want to
become. Everything else is secondary.
When I was young, there was an amazing publication called The Whole Earth Catalog, which was one of the bibles of
my generation. It was created by a fellow named Stewart Brand not far from here in Menlo Park, and he brought it to
life with his poetic touch. This was in the late 1960’s, before personal computers and desktop publishing, so it was all
made with typewriters, scissors, and polaroid cameras. It was sort of like Google in paperback form, 35 years before
Google came along: it was idealistic, and overflowing with neat tools and great notions.
Stewart and his team put out several issues of The Whole Earth Catalog, and then when it had run its course, they put
out a final issue. It was the mid-1970s, and I was your age. On the back cover of their final issue was a photograph of
an early morning country road, the kind you might find yourself hitchhiking on if you were so adventurous. Beneath it
were the words: “Stay Hungry. Stay Foolish.” It was their farewell message as they signed off. Stay Hungry. Stay
Foolish. And I have always wished that for myself. And now, as you graduate to begin anew, I wish that for you.
Stay Hungry. Stay Foolish.
Thank you all very much.

Saturday, October 17, 2009

Nobel Prize for Chemistry 2009


Nobel Prize for Chemistry 2009


Congratulations Venkataraman Ramakrishnan
for making our Nation Proud.


Nobel Prize for Chemistry 2009

If you want to listen to the Interview with Sri Venkataraman Ramakrishnan please do click the following link
http://nobelprize.org/mediaplayer/index.php?id=1183

Website of the Nobel winner

http://www.mrc-lmb.cam.ac.uk/ribo/homepage/ramak/index.html

Venkatraman Ramakrishnan: A profile


For a brief sketch of Ventakaraman Ramakrishnan
Please click on the following site
http://en.wikipedia.org/wiki/Venkatraman_Ramakrishnan

Venkatraman Ramakrishnan
From Wikipedia, the free encyclopedia

Venkatraman Ramakrishnan

Born 1952
Chidambaram, Tamil Nadu, India
Residence United Kingdom
Citizenship United States
Nationality American
Ethnicity Indian
Fields Biochemistry and Biophysics and Computational Biology
Institutions MRC Laboratory of Molecular Biology, Cambridge, England, Trinity College, Cambridge
Known for Bio-crystallography
Notable awards Nobel Prize in Chemistry (2009).

Venkatraman "Venki" Ramakrishnan (Tamil: வெங்கட்ராமன் ராமகிருஷ்ணன்; born 1952) is a structural biologist at the Laboratory of Molecular Biology of the Medical Research Council located in Cambridge, England.[1] He is a Fellow of Trinity College, Cambridge.[2][3] He was awarded the 2009 Nobel Prize in Chemistry, along with Thomas A. Steitz and Ada Yonath.[4]
Contents
[hide]

* 1 Early life and education
* 2 Background and research work
* 3 Honours
* 4 References
* 5 External links

Early life and education

Venkatraman Ramakrishnan was born in 1952 in Chidambaram in Tamil Nadu, India,[5] where he completed his pre-university studies at Annamalai University.[6] Later, he obtained his B.Sc. in Physics from Maharaja Sayajirao University of Baroda, India, in 1971 and then his Ph.D. in Physics from Ohio University in 1976.[7][8][9] He then spent a year taking classes in biology at the University of California, San Diego while transitioning from theoretical physics to biology.[10]
Background and research work

Venkatraman Ramakrishnan has published more than 95 research papers, the earliest being in 1977.[11] In 2000, Venkatraman Ramakrishnan's laboratory determined the structure of the 30S subunit of the ribosome and its complexes with several antibiotics.[12] He also published three papers about his ribosome research in the August 26, 1999, and September 21, 2000, issues of the journal Nature.[7] This was followed by studies that provided structural insights into the mechanism that ensures the fidelity of protein biosynthesis. More recently, his laboratory has determined the atomic structure of the whole ribosome in complex with its tRNA and mRNA ligands. Ramakrishnan is also known for his past work on histone and chromatin structure.

Ramakrishnan is known for his work on the determination of the three-dimensional structure of the small ribosomal subunit and its complexes with substrates and antibiotics, which has shed light on the mechanism that ensures the fidelity of protein synthesis, and for his work on the structures of chromatin-related proteins.[13]
Honours

Ramakrishnan was awarded the 2009 Nobel Prize in Chemistry along with Thomas A. Steitz and Ada Yonath.[14] Ramakrishnan will be awarded the Nobel Prize along with one-third of the total prize money of 10 million Swedish kronor ($1.4 million), in a ceremony in Stockholm on December 10.[15] Thus, he became the seventh Indian or person of Indian origin to win the Nobel Prize.[7] Official Nobel Foundation website telephone interview audio with him is available here. [16] He is a Fellow of the Royal Society, and a member of EMBO and the U.S. National Academy of Sciences.

References

1. ^ "Venki Ramakrishnan". Laboratory of Molecular Biology. 2004. http://www.mrc-lmb.cam.ac.uk/ramak/. Retrieved 2009-10-07.
2. ^ "New Trinity Fellows". The Fountain, Trinity College Newsletter. https://alumni.trin.cam.ac.uk/design/pdfs/Fountainspring09.pdf. Retrieved 2009-10-07.
3. ^ "Dr. Venki Ramakrishnan". Trinity College, Cambridge. 2008. http://www.trin.cam.ac.uk/index.php?pageid=176&conid=350. Retrieved 2009-10-07.
4. ^ Abadjiev, Stanislav P. (7 October 2009). "The Nobel Prize in chemistry is going to Ramakrishnan, Steitz, Yonath". Science Centric. http://www.sciencecentric.com/news/article.php?q=09100741-the-nobel-prize-chemistry-is-going-ramakrishnan-steitz-yonath. Retrieved 2009-10-07.
5. ^ 2009 Nobel Prize in Chemistry, Nobel Foundation.
6. ^ Press Trust of India (PTI) (7 October 2009). "Venkatraman's teacher happy over ward's Nobel". Times of India. http://timesofindia.indiatimes.com/city/chennai/Venkatramans-teacher-happy-over-wards-Nobel/articleshow/5098759.cms. Retrieved 2009-10-07.
7. ^ a b c Press Trust of India (PTI) (7 October 2009). "Venkatraman Ramakrishnan: A profile". Times of India. http://timesofindia.indiatimes.com/india/Venkatraman-Ramakrishnan-A-profile/articleshow/5098151.cms. Retrieved 2009-10-07.
8. ^ "FACTBOX: Nobel chemistry prize - Who are the winners?". http://www.reuters.com/article/topNews/idUSTRE5962EE20091007. Retrieved 2009-10-07.
9. ^ Sonwalkar, Prasun (October 8, 2009). "Venkatraman Ramakrishnan wins Nobel for Chemistry". Press Trust of India (PTI). http://www.ptinews.com/news/318589_Venkatraman-Ramakrishnan-wins-Nobel-for-Chemistry. Retrieved 2009-10-07.
10. ^ Associated Press (7 October 2009). "Profile: Dr Venkatraman Ramakrishnan". Indian Express. http://www.indianexpress.com/news/profile-dr-venkatraman-ramakrishnan/526251/. Retrieved 2009-10-07.
11. ^ "Publications (Venki Ramakrishnan)". Laboratory of Molecular Biology. http://www.mrc-lmb.cam.ac.uk/ribo/homepage/ramak/ramak_publications.html. Retrieved 2009-10-07.
12. ^ "Welcome to the Ramakrishnan Lab web page". Laboratory of Molecular Biology. 2004. http://www.mrc-lmb.cam.ac.uk/ribo/. Retrieved 2009-10-07.
13. ^ "About the PNAS Member Editor". PNAS. http://nrc88.nas.edu/pnas_search/memberDetails.aspx?ctID=20004810. Retrieved 2009-10-07.
14. ^ "All Nobel Laureates in Chemistry". Nobel Foundation. http://nobelprize.org/nobel_prizes/chemistry/laureates/index.html. Retrieved 2009-10-07.
15. ^ Overbye, Dennis (October 7, 2009). "Three Win Nobel for Ribosome Research". The New York Times. http://www.nytimes.com/2009/10/08/science/08nobel.html?em. Retrieved 2009-10-07.
16. ^ "Venkatraman Ramakrishnan Audio Interview". Nobel Website. http://nobelprize.org/nobel_prizes/chemistry/laureates/2009/ramakrishnan-interview.html. Retrieved 2009-10-07.

External links

* Venkatraman Ramakrishnan, homepage at MRC Laboratory of Molecular Biology.
* Venkatraman Ramakrishnan, profile from Times Of India

Randy Pausch Last Lecture

Book Introduction of this Kannada Version will be published soon in http://bedrebaraha.blogspot.com



Randy Pausch Last Lecture: Achieving Your Childhood Dreams
http://www.youtube.com/watch?v=ji5_MqicxSo



http://video.google.com/videoplay?docid=8577255250907450469#



Randy Pausch reprising his “Last Lecture”

11:32 - 1 year ago
New: see Randy’s book about his “Last Lecture” at www.cs.virginia.edu/~robins/Randy_Book.html Randy Pausch reprising his inspirational “Last Lecture” on the Oprah Show (Oct 22, 2007). See the full-length version of this short Oprah Show reprise at www.cs.virginia.edu/robins/Randy . Randy Pausch (www.randypausch.com) is a virtual reality pioneer, human-computer interaction researcher, co-founder of CMU’s Entertainment Technology Center (www.etc.cmu.edu), and creator of the Alice (www.alice.org) software project. High-resolution downloadable versions of Randy’s videos can be found at www.cs.virginia.edu/robins/Randy

http://video.google.com/videoplay?docid=-5700431505846055184#



Dying 47-Year-Old Professor Gives Exuberant ‘Last Lecture’
1:44:08 - 2 years ago
Randy Pausch Almost all of us have childhood dreams: for example, being an astronaut, or making movies or video games for a living. Sadly, most people don’t achieve theirs, and I think that’s a shame. I had several specific childhood dreams, and I’ve actually achieved most of them. More importantly, I have found ways, in particular the creation (with Don Marinelli), of CMU’s Entertainment Technology Center (etc.cmu.edu), of helping many young people actually *achieve* their childhood dreams. This talk will discuss how I achieved my childhood dreams (being in zero gravity, designing theme park rides for Disney, and a few others), and will contain realistic advice on how *you* can live your life so that you can make your childhood dreams come true, too.

Inspirational Speech by Dr. Randy Pausch On the Oprah Winfrey Show: The Last Lecture. Dr. Pausch Passed Away On July 25, 2008

http://www.youtube.com/watch?v=R9ya9BXClRw


How India missed another Nobel Prize

How India missed another Nobel Prize

Last updated on: October 12, 2009 11:37 IST
Shivanand Kanavi reveals how Narinder Kapany, the Father of Fibre Optics, missed out on a Nobel Prize [ Images ] this year.

First, it was Jagadish Chandra Bose at the turn of the century, who was the first to demonstrate wireless signaling in 1895. Later, he even created a radio wave receiver called the 'coherer' from iron and mercury. Though he showed no interest in patenting it, Bose demonstrated his inventions in Kolkata [ Images ] and London [ Images ].

Sir Neville Mott, who won the Nobel Prize for Physics in 1978, in fact commented that Bose had foreseen the 'n' and 'p' type semiconductors, and was 'sixty years ahead of his time.' However, the Nobel Prize in Physics for wireless communication was awarded to Guglielmo Marconi in 1909, 14 years after Bose had demonstrated the possibility.

Then came Satyendranath Bose, who sent a paper on the statistics of quanta of light–photons to Albert Einstein.

Einstein supported the paper and got it published in Zeitschrift der Physik in 1924, and that in turn gave birth to the now famous Bose-Einstein statistics and the term 'Bosons' for all those elementary particles that follow it.

Even though three Nobel Prizes have been awarded for works based on Bose statistics, the originator of the idea was never awarded one.

Moving on, G N Ramachandran deserved a Nobel for his work on bio-molecular structures in general and, more particularly, the triple helical structure of collagen. E C George Sudarshan produced pioneering contributions to Quantum Optics and coherence, but his work was ignored, and Roy Glauber was awarded the Physics Nobel in 2005 for the same work.

And so to this week: The press release issued by The Royal Swedish Academy of Sciences on the Nobel Prize for Physics for 2009 says 'one half' of the prize has been awarded to Charles K Kao 'for groundbreaking achievements concerning the transmission of light in fibers for optical communication.'

What the Academy omitted to note was that Moga, Punjab-born Narinder Singh Kapany, widely considered the Father of Fibre Optics, and, in this capacity, featured in a 1999 Fortune magazine article on the 'Unsung Heroes of the 20th Century', had far the stronger claim.

Charles Kao in a 1996 paper put forward the idea of using glass fibres for communication using light; he tirelessly evangelised it and fully deserves a share of the Prize. However, the fact remains that it was Kapany who first demonstrated successfully that light can be transmitted through bent glass fibres during his doctoral work at the Imperial College of Science in London in the early fifties, and published the findings in a paper in Nature in 1954.

Since then, Kapany irelessly developed applications of fibre optics for endoscopy during the fifties and later coined the term Fibre Optics in an article in Scientific American in 1960. His body of work provided the basis for the developments of any and all applications in communications.

In a book published in 2003 by Rupa & Co titled Sand to Silicon: The Amazing Story of Digital Technology, I had written of the respective contributions of Kapany and Kao to the field of Fiber Optics. A relevant excerpt (pages: 154-159):

'Very few Indians know that an Indian, Narinder Singh Kapany, a pioneer in the field, coined the term (Fibre Optics) in 1960. We will come to his story later on, but before that let us look at what fibre optics is. It all started with queries like: Can we channel light through a curved path, even though we know that light travels in a straight line?'

'Why is that important? Well, suppose you want to examine an internal organ of the human body for diagnostic or surgical purposes. You would need a flexible pipe carrying light. Similarly, if you want to communicate by using light signals, you cannot send light through the air for long distances; you need a flexible cable carrying light over such distances.'

'The periscopes we made as class projects when we were in school, using cardboard tubes and pieces of mirror, are actually devices to bend light. Bending light at right angles as in a periscope was simple. Bending light along a smooth curve is not so easy. But it can be done, and that is what is done in optic fibre cables.'

'For centuries people have built canals or viaducts to direct water for irrigation or domestic use. These channels achieve maximum effect if the walls or embankments do not leak.'

'Similarly, if we have a pipe whose insides are coated with a reflecting material, then photons or waves can be directed along easily without getting absorbed by the wall material.'

'A light wave gets reflected millions of times inside such a pipe (the number depending on the length and diameter of the pipe and the narrowness of the light beam).'

'This creates the biggest problem for pipes carrying light. Even if we can get coatings with 99.99 per cent reflectivity, the tiny 'leakage' of 0.01 per cent on each reflection can result in a near-zero signal after 10,000 reflections.'

'Here a phenomenon called total internal reflection comes to the rescue. If we send a light beam from water into air, it behaves peculiarly as we increase the angle between the incident ray and the perpendicular.'

'We reach a point when any increase in the angle of incidence results in the light not leaving the water and, instead, getting reflected back entirely. This phenomenon is called total internal reflection.'

'Any surface, however finely polished, absorbs some light, and hence repeated reflections weaken a beam.'

'But total internal reflection is a hundred per cent, which means that if we make a piece of glass as non-absorbent as possible, and if we use total internal reflection, we can carry a beam of light over long distances inside a strand of glass.'

'This is the principle used in fibre optics.'

'The idea is not new. In the 1840s, Swiss physicist Daniel Collandon and French physicist Jacques Babinet showed that light could be guided along jets of water.'

'British physicist John Tyndall popularised the idea further through his public demonstrations in 1854, guiding light in a jet of water flowing from a tank.'

'Since then this method has been commonly used in water fountains. If we keep sources of light that change their colour periodically at the fountainhead, it appears as if differently coloured water is springing out of the fountain.'

'Later many scientists conceived of bent quartz rods carrying light, and even patented some of these inventions. But it took a long time for these ideas to be converted into commercially viable products. One of the main hurdles was the considerable absorption of light inside glass rods.'

'Narinder Singh Kapany recounted to the author, "When I was a high school student at Dehradun in the beautiful foothills of the Himalayas, it occurred to me that light need not travel in a straight line, that it could be bent. I carried the idea to college. Actually it was not an idea but the statement of a problem. When I worked in the ordnance factory in Dehradun after my graduation, I tried using right-angled prisms to bend light.'

'However, when I went to London to study at the Imperial College and started working on my thesis, my advisor, Dr Hopkins, suggested that I try glass cylinders instead of prisms. So I thought of a bundle of thin glass fibres, which could be bent easily. Initially my primary interest was to use them in medical instruments for looking inside the human body. The broad potential of optic fibres did not dawn on me till 1955. It was then that I coined the term fibre optics."'

'Kapany and others were trying to use a glass fibre as a light pipe or, technically speaking, a 'dielectric wave guide'. But drawing a fibre of optical quality, free from impurities, was not an easy job. Kapany went to the Pilkington Glass Company, which manufactured glass fibre for non-optical purposes. For the company, the optical quality of the glass was not important.'

'"I took some optical glass and requested them to draw fiber from that," says Kapany. "I also told them that I was going to use it to transmit light. They were perplexed, but humoured me."'

'A few months later Pilkington sent spools of fibre made of green glass, which is used to make beer bottles. "They had ignored the optical glass I had given them. I spent months making bundles of fibre from what they had supplied and trying to transmit light through them, but no light came out. That was because it was not optical glass. So I had to cut the bundle to short lengths and then use a bright carbon arc source."'

'Kapany was confronted with another problem. A naked glass fibre did not guide the light well. Due to surface defects, more light was leaking out than he had expected. To transmit a large image he would have needed a bundle of fibres containing several hundred strands; but contact between adjacent fibers led to loss of image resolution.'

'Several people then suggested the idea of cladding the fibre. Cladding, when made of glass of a lower refractive index than the core, reduced leakages and also prevented damage to the core. Finally, Kapany was successful; he and Hopkins published the results in 1954 in the British journal Nature.'

'Kapany then migrated to the US and worked further in fibre optics while teaching at Rochester and the Illinois Institute of Technology. In 1960, with the invention of lasers, a new chapter opened in applied physics. From 1955 to 1965 Kapany was the lead author of dozens of technical and popular papers on the subject. His writings spread the gospel of fibre optics, casting him as a pioneer in the field.'

'His popular article on fibre optics in Scientific American in 1960 finally established the new term (fibre optics); the article constitutes a reference point for the subject even today. In November 1999, Fortune magazine published profiles of seven people who have greatly influenced life in the twentieth century but are unsung heroes. Kapany was one of them.'

'If we go back into the history of modern communications involving electrical impulses, we find that Alexander Graham Bell patented an optical telephone system in 1880. He called this a 'photophone'. Bell converted speech into electrical impulses, which he converted into light flashes.'

'A photosensitive receiver converted the signals back into electrical impulses, which were then converted into speech. But the atmosphere does not transmit light as reliably as wires do; there is heavy atmospheric absorption, which can get worse with fog, rain and other impediments.'

'As there were no strong and directional light sources like lasers at that time, optical communications went into hibernation. Bell's earlier invention, the telephone, proved far more practical. If Bell yearned to send signals through the air, far ahead of his time, we cannot blame him; after all, it's such a pain digging and laying cables.'

'In the 1950s, as telephone networks spread, telecommunications engineers sought more transmission bandwidth. Light, as a carrying medium, promised the maximum bandwidth. Naturally, optic fibres attracted attention. But the loss of intensity of the signal was as high as a decibel per metre.'

'This was fine for looking inside the body, but communications operated over much longer distances and could not tolerate losses of more than ten to twenty decibels per kilometre. Now what do decibels have to do with it? Why is signal loss per kilometre measured in decibels?'

'The human ear is sensitive to sound on a logarithmic scale; that is why the decibel scale came into being in audio engineering, in the first place.'

'If a signal gets reduced to half its strength over one kilometre because of absorption, after two kilometres it will become a fourth of its original strength. That is why communication engineers use the decibel scale to describe signal attenuation in cables.'

'In the early 1969s signal loss in glass fiber was one decibel per metre, which meant that after traversing ten metres of the fiber the signal was reduced to a tenth of its original strength.'

'After twenty metres the signal was a mere hundredth its original strength. As you can imagine, after traversing a kilometre no perceptible signal was left.'

'A small team at the Standard Telecommunications Laboratories in the UK was not put off by this drawback. This group was headed by Antoni Karbowiak, and later by a young Shanghai-born engineer, Charles Kao.'

'Kao studied the problem carefully and worked out a proposal for long-distance communications through glass fibres. He presented a paper at a London meeting of the Institution of Electrical Engineers in 1966, pointing out that the optic fibre of those days had an information-carrying capacity of one GHz, or an equivalent of 200 TV channels, or more than 200,000 telephone channels.'

'Although the best available low-loss material then showed a loss of about 1,000 decibels/kilometre (dB/km), he claimed that materials with losses of just 10 to 20 dB/km would eventually be developed.'

'With Kao almost evangelistically promoting the prospects of fibre communications, and the British Post Office (the forerunner to British Telecom) showing interest in developing such a network, laboratories around the world tried to make low-loss fibre. It took four years to reach Kao's goal of 20dB/km.'

'At the Corning Glass Works (now Corning Inc), Robert Maurer, Donald Keck and Peter Schultz used fused silica to achieve the feat. The Corning breakthrough opened the door to fibre-optic communications. In the same year, Bell Labs and a team at the Ioffe Physical Institute in Leningrad (now St Petersburg [ Images ]) made the first semiconductor lasers, able to emit a continuous wave at room temperature.'

'Over the next several years, fibre losses dropped dramatically, aided by improved fabrication methods and by the shift to longer wavelengths where fibers have inherently lower attenuation.'

'Today's fibres are so transparent that if the Pacific Ocean, which is several kilometres deep, were to be made of this glass we could see the ocean bed!'

'Note one point here. The absorption of light in glass depends not only on the chemical composition of the glass but also on the wavelength of light that is transmitted through it. It has been found that there are three windows with very low attenuation: One is around 900 nanometres, the next at 1,300 nm and the last one at 1,550 nm.'

'Once engineers could develop lasers with those wavelengths, they were in business. This happened in the 1970s and 1980s, thanks to Herbert Kroemer's hetero-structures and many hard-working experimentalists.'

The excerpt ends here. While working on this book and particularly this chapter, I had thought that with the world now firmly ensconced in the era of communications, it wouldn't be long before Narinder Kapany's pioneering work in the field was recognised with the Nobel Prize.

Now, two years later, I find that the name of the pioneer of fibre optics has been added to a very long list of Indians who, though richly deserving of the ultimate accolade, the Nobel Prize, have been mysteriously passed over by the august members of the Royal Swedish Academy of Sciences.

Images: Top: Dr Narinder Kapany today. Photograph: Palashranjan Bhaumick/Business India. Bottom: Dr Kapany at work in his lab in the 1950s.

Shivanand Kanavi in New Delhi

Friday, June 5, 2009

Inaugural Ceremony of SRS Pre-University College, Pillekeranahally, Chitradurga 05-06-2009





We, the Chairman and the Members of the Faculty,
Sri Sri Ranganatha Swamy Education Society (R)
Welcome you to the Inaugural Ceremony of
SRS PU College
on this
World Environment Day, 6th June 2009
All the Students and the members of the Faculty Plant a Seedling on this occassion.

Wednesday, April 15, 2009

Prospectus and Application Form for I PUC Admission 2009-2010

An Appeal
Prospectus



Application Form
Prospectus and Application Form
I PUC Admission 2009-2010