Category Physics

Why is Dr. Jagadish Shukla famous?

Dr. Jagadish Shukla was born in a small village, Mirdha, in Uttar Pradesh. The village had no electricity, not even proper roads. The primary school did not have a building, and Jagadish Shukla had his early classes under a large banyan tree! He could not study science in high school because the schools did not include it.

He went to Banaras Hindu University (BHU) and graduated in Physics, Mathematics and Geology. He did MS in Geophysics and then finished his PhD too. Later he got a ScD (Doctor of Science) in Meteorology from the Massachusetts Institute of Technology (MIT).

He chose a career in the atmospheric sciences and became a professor at George Mason University in the U.S.

Dr. Shukla’s study areas include the Asian monsoon dynamics, deforestation and desertification. Do you know what is desertification? It is when the soil loses its quality due to weather or human activity.

Dr. Shukla helped establish weather and climate research centres in India. He also established research institutions in Brazil and the U.S. He has been with the World Climate Research Programme since its start and founded the Centre for Ocean- Land-Atmosphere Studies, Virginia, U.S.

He has also established the Gandhi College in his village for educating rural students, especially women, and was awarded Padma Shri in 2012.

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What made Atish Dabholkar a famous theoretical physicist?

Atish Dabholkar is a theoretical physicist who researches on string theory and quantum black holes.

String theory says that reality is made up of vibrating strings that are smaller than atoms and electrons, whereas, black holes are regions in space with very heavy mass. One can say they eat up everything that enter it. Due to their high gravitational pull even light cannot escape from them. Now, quantum black holes are hypothetical tiny black holes, a concept that was introduced by Stephen Hawking.

Atish Dhabolkar is presently the Director of the Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy. He is a graduate of IIT-Kanpur. He did PhD in theoretical physics from Princeton University, U.S. Then he did postdoctoral studies and further research at Rutgers University, Harvard University and the California Institute of Technology.

He worked as a professor at the Tata Institute of Fundamental Research in Mumbai. He also served as a visiting professor at Stanford University, US, and was a visiting scientist at CERN, Geneva, Switzerland. He joined ICTP in 2014.

He has received many honours, including the Shanti Swarup Bhatnagar Award (2006). He was awarded the Chaire d’Excellence of the Agence Nationale de la Recherche in France the next year. He is also a recipient of the National Leadership award from the President of India in 2008. The World Academy of Sciences (TWAS), Italy, elected him as a Fellow last year.

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Why is Samir K. Brahmachari an important figure on the scientific stage in India?

Samir K. Brahmachari is a biophysicist who is among the first in utilizing computational tools for genome analysis. He has developed many bioinformatics tools. His research led to the creation of the genetic profile of Indians known as the Indian Genome Variation Project. This was later extended to include all East Asian countries.

He was the first to market the novel, globally competitive bio-informatics software products from CSIR. He has 12 patents, 23 copyrights and 155 research publications to his credit.

Brahmachari did BSc and MSc in chemistry from the University of Calcutta. He earned a PhD in Molecular Biophysics from the Indian Institute of Science in Bengaluru. He did post-doctoral research at Paris Diderot University. Then he was a visiting scientist at the Memorial University of Newfoundland.

He worked as a Professor in Indian Institute of Science and also served as a Visiting Professor at the Max Planck Institute for Biophysical Chemistry.

Then he became the Director General of the Council of Scientific & Industrial Research (CSIR) and Secretary, Department of Scientific and Industrial Research (DSIR), Government of India. He was the Founder Director of Institute of Genomics and Integrative Biology (IGIB), New Delhi and the Chief Mentor of Open Source for Drug Discovery (OSDD) Project.

The J.C Bose Fellowship Award is one among the many honours that he has received.

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What are Sunil Mukhi’s areas of research?

Dr. Sunil Mukhi is an Indian theoretical physicist who has greatly contributed to the string theory and the quantum field theory. We have already dealt with the string theory. The quantum field theory studies the behaviour of subatomic particles in different kinds of force fields.

Dr Mukhi took a Ph.D. in theoretical physics from the State University of New York at Stony Brook in 1981. Then he did postdoctoral studies at the International Centre for Theoretical Physics, in Trieste, Italy. He came back to India and joined the Theoretical Physics Group at the Tata Institute of Fundamental Research, Mumbai in 1993.

He joined as head of the Physics department of the Indian Institute of Science Education and Research, Pune in 2012. He rose to become the Dean after 7 years.

He is a Fellow of the Indian Academy of Sciences, and the Indian National Science Academy. He has received the Shanti Swarup Bhatnagar award for Physical Sciences, 1999, and the J.C. Bose Fellowship, 2008. He was named a Fellow of TWAS, (The World Academy of Sciences) in October 2014.

He is also the editor of the Journal of High Energy Physics since its start.

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What was invented by DF Arago in 1820?

On September 25, 1820, French physicist Francois Arago announced his discovery of an occurrence of electromagnetism. This was just one of Arago’s many contributions as he spent a lifetime for the progress of science.

It isn’t often that we come across a person who contributes significantly to a number of different fields. Such polymaths – individuals whose knowledge encompasses a wide range of subjects – have always been rare. Frenchman Dominique Francois Jean Arago was one such person in this world, as he donned the hat of a physicist. mathematician, astronomer, and politician in an eventful life.

Born in 1786 in Estagel, Roussillon, France, Arago was one of 11 children. Educated at the Municipal College of Perpignan, Arago was drawn towards mathematics from a young age. He was admitted to the Ecole Polytechnique in Paris, where he succeeded French mathematician Gaspard Monge as the chair of Analytic Geometry at the young age of 23.

Love for optics

He made his first major contributions to science in the decade that followed. Working with French engineer Augustin-Jean Fresnel, Arago was able to show that while two rays polarised in a plane can interfere with each other, two beams of light polarised perpendicular to each other cannot interfere with each other. This research led to the discovery of the laws of light polarisation.

In 1820, Arago briefly interrupted his optical work to significantly expand on electromagnetic theories. Having been invited to Geneva to witness the experiments of Danish physicist Hans Christian Oersted linking electricity to magnetism, Arago was instantly converted and developed a huge interest in the subject.

Apart from repeating the Geneva experiments at the Paris Academy, Arago also experimented on his own. He was able to demonstrate that by passing an electric current through a cylindrical spiral of wire, it could be made to behave like a magnet. The temporary magnetisation allowed it to attract iron filings, which then fell off when the current ceased. He announced this occurrence of electromagnetism on September 25, 1820.

Electromagnetic induction

Soon after, Arago discovered the principle of the production of magnetism by rotation of a nonmagnetic conductor. He was able to show that the rotation of a nonmagnetic metallic substance like copper created a magnetic effect as it produced rotation in a magnetic needle suspended over it. It was another decade before English scientist Michael Faraday explained these using his theory of electromagnetic induction in 1831.

Arago served as the director of the Paris Observatory from 1830. As an astronomer, he was among the first to explain the scintillation of stars using interference phenomena. He was also able to provide vital stimulus to young astronomers, including Frenchman Urbain Le Verrier.

“With the point of his pen”

In 1845, Arago suggested to his protege that he investigate the anomalies in the motion of Uranus. These investigations resulted in Le Verriers discovery of Neptune in 1846, and Arago best summed it up when he called Le Verrier the man who “discovered a planet with the point of his pen”. Arago backed Le Verrier in the dispute between Le Verrier and British astronomer John Couch Adams over priority in discovering Neptune and even suggested naming the planet for Le Verrier.

Amidst all his scientific endeavours, Arago also found time to back the ideas of others. Even though French photographer Louis Daguerre was struggling to sell his daguerreotype process, he was able to catch the attention of Arago, who served as the permanent secretary of the French Academy of Sciences.

Advocate for photography

Arago arranged for the first public display of daguerreotypes in January 1839 and used the buzz it created for his lobbying. He was able to get the French Parliament to grant pensions to Daguerre and Isidore Niepce, son of French inventor Nicephore Niepce, so that they could make all the steps of the photographic process public. Arago stated that “France should then nobly give to the whole world this discovery which could contribute so much to the progress of art and science” and the technical details were made public on August 19, 1839 (hence celebrated as World Photography Day).

Optics and the study of light remained close to Arago’s heart and he devised an experiment to prove the wave theory of light. In 1838, he described a test for comparing the velocity of light in air and in water or glass. The elaborate arrangements required for the experiment and his own failing eyesight, however, meant that it wasn’t performed. Shortly before Arago’s death, French physicists Hippolyte Fizeau and Leon Foucault demonstrated the retardation of light in denser media by improving on Arago’s suggested method.

For a man who spent so much of his time pursuing science, he was also able to devote to other causes as a politician. Following the July Revolution of 1830 and up until his death in 1853, Arago was active as a politician, delivering influential speeches regarding educational reform, freedom of press, and the application of scientific thought for progress. After the February Revolution of 1848, he served as the Minister of War and the Navy and used his power to abolish slavery in French colonies. Arago’s influential life highlights the fact that he always possessed the faculty to inspire and stimulate those around him and the public at large, both in the realm of science and in politics.

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Which is Europe’s largest nuclear plant?

The Zaporizhzhia plant in southern Ukraine is Europe’s largest nuclear plant. It was captured by Russia in March, following its invasion of Ukraine in February 2022, raising global fears of a nuclear disaster. Bouts of shelling in the region followed, prompting calls for an urgent inspection of the facility by experts of the International Atomic Energy Agency (IAEA). But what is IAEA and what are its functions? Let’s find out.

The International Atomic Energy Agency, abbreviated as IAEA, is the United Nations’ nuclear watchdog. The centre for nuclear cooperation and safeguards, the IAEA seeks to promote safe, secure, and peaceful use of nuclear technologies contributing to international security.

It was U.S. President Eisenhower’s “Atoms for Peace” address to the U.N. General Assembly (UNGA) in December 1953 that sowed the seeds for the creation of the agency. The IAEA was established in 1957 as an autonomous agency within the U.N family in response to fears arising from the varied uses of nuclear technology.

The IAEA is an autonomous agency with its headquarters in Vienna, Austria. It works with its over 170 member states worldwide to “promote and control the Atom” for peaceful purposes and enable exchange of scientific and technical information between them. Being the international safeguards inspectorate, its mandate includes setting the framework for cooperative efforts to strengthen an international nuclear safety and security regime and verifying whether the member states fulfil their non-proliferation undertakings under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT).

Funded by its member states and other donors, the IAEA runs scientific research labs in Austria, Monaco, and Italy. It reports to the UN General Assembly every year, and to the UN Security Council if need be when there are instances of non-compliance with regard to safeguards and security obligations by member states.

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