ARLA/CLUSTER: Cientista indiano Jagadis Chandra Bose, um herói quase desconhecido nas radiocomunicações

[João Costa > CT1FBF]

Jagadis Chandra Bose, the unsung Hero of Radio Communication

Jagadis Chandra Bose was born in India in 1858. He received his
education first in India, until in 1880 he went to England to study
medicine at the University of London.

Within a year he moved to Cambridge to take up a scholarship to study
Natural Science at Christ's College Cambridge. One of his lecturers at
Cambridge was Professor Rayleigh, who clearly had a profound influence
on his later work.

In 1884 Bose was awarded a B.A. from Cambridge, but also a B.Sc. from
London University. Bose then returned to India, taking up a post
initially as officiating professor of physics at the Presidency
College in Calcutta. Following the example of Lord Rayleigh, Jagadis
Bose made extensive use of scientific demonstrations in class; he is
reported as being extraordinarily popular and effective as a teacher.
Many of his students at the Presidency College were destined to become
famous in their own right - for example S.N. Bose, later to become
well known for the Bose-Einstein statistics.

A book by Sir Oliver Lodge, "Heinrich Hertz and His Successors,"
impressed Bose. In 1894, J.C. Bose converted a small enclosure
adjoining a bathroom in the Presidency College into a laboratory. He
carried out experiments involving refraction, diffraction and
polarization. To receive the radiation, he used a variety of different
junctions connected to a highly sensitive galvanometer. He plotted in
detail the voltage-current characteristics of his junctions, noting
their non-linear characteristics. He developed the use of galena
crystals for making receivers, both for short wavelength radio waves
and for white and ultraviolet light.

Patent rights for their use in detecting electromagnetic radiation
were granted to him in 1904. In 1954 Pearson and Brattain [14] gave
priority to Bose for the use of a semi-conducting crystal as a
detector of radio waves. Sir Neville Mott, Nobel Laureate in 1977 for
his own contributions to solid-state electronics, remarked [12] that
"J.C. Bose was at least 60 years ahead of his time" and "In fact, he
had anticipated the existence of P-type and N-type semiconductors."

http://swli05639fr.blogspot.co.uk/2017/04/jagadis-chandra-bose-was-born-in-india.html

https://www.cv.nrao.edu/~demerson/bose/bose.html

http://web.mit.edu/varun_ag/www/bose.html