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      Volume 25, Issue 9

      September 2020,   pages  1171-1309

    • Editorial

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    • Science Smiles

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    • Daulat Singh Kothari (1906–1993): Scientist, Teacher, Administrator and Humanist

      Amit Roy

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    • Will Betelgeuse Explode?

      Priya Hasan

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      Since October 2019, Betelgeuse began to dim noticeably and by January 2020 its brightness had dropped by a factor of approximately 2.5, demoting it from the position of the top (apparent) brightest 11th star to the 21st! Astronomers were excited and thought of it as the lull before the storm, Betel-geuse was ready to go supernova!This article is aimed more as a case study where we show how this question was answered using scientific arguments and data. It will also highlight the importance of supernovae to human existence and give a brief discussion on the evolu-tion of massive stars.And also, answer the question!

    • Hydra: A Powerful Biological Model

      Surendra Ghaskadbi

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      Hydra, a freshwater diploblast, with a simple but defined body plan, an organized nervous system, and the presence of stem cells, is one of the oldest model organisms used in biology. It exhibits many embryonic features even as an adult, a spectacular ability of regeneration, and lack of organismal aging. Hydra can provide insights into how complex animal forms evolved and is waiting to be better utilized in teaching.

    • The Mind Behind the Hebbian Synapse: Donald O Hebb

      Shriya Palchaudhuri

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      How do neurons orchestrate behaviour? Let us trace our footsteps back to one of the first hypotheses proposing an al-liance between the brain and behaviour. This article trace Donald Hebb’s life, and how, in the neurophysiology milieu of the 20th century, he revolutionized the way psychologists and neuroscientists viewed the brain, bringing a unifying concept of the mind with his publication of $The Organization of Behaviour$. In closing, the legacy of Hebb in the after-years of the monograph is discussed in the context of contemporary discoveries in the realm of neural plasticity and learning that revisit Hebbian concepts.

    • Experiences of a New Teacher

      Purusharth I Rajyaguru

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      This article is an attempt to put together my experiences gath-ered over the last six years of teaching biology. Since joining as a research faculty, I have learnt that teaching is a tough but extremely rewarding (both scientifically and emotionally) activity when done the right way. As research institutions across India are increasingly focused on imparting quality ed-ucation, I consider it imperative that every researcher aims to be a good teacher. I have been striving to be one, but at this point, I am far from it. In this article, I share my opinions based on my personal experiences. These experiences have helped me improve my teaching, as well as, connect better with the students—in the class, as well as, in the laboratory.

    • Making Inorganic Chemistry Interesting: Analogy Based Pragmatic Approach to Learning

      Rajesh N

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      The undergraduate student perception of inorganic chem-istry as routine and unimaginative was transformed by adopt-ing few innovative approaches in the pedagogy. This is pri-marily a reflection of my experiences in classroom teaching that is presented in this commentary. Fun-oriented, anal-ogy based and pragmatic approach was used to explain sim-ple concepts in inorganic chemistry. Laboratory demonstrations and exposure to understand research articles made the course more interesting. Selective examples of defining classroom moments are presented in this reflective commentary. Framing questions in an animated, imaginative and unconventional style made students feel quite challenged and also experience the joy in learning. The introduction of group discussion as an evaluative component enhanced the soft skills of the students. The creative instinct in learning changed students’ perception of inorganic chemistry from an insipid to a highly engaging and captivating subject.

    • On Proving a Program Shortest

      Arindama Singh

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      We revisit a problem faced by all programmers. Can one write a program that determines whether any given program is the shortest program? How does one prove that a given program is the shortest? After answering these questions, we discuss very briefly the Kolmogorov complexity of a string of zero and one, which leads to a barrier on any axiomatic system, known as Chaitin’s barrier.

    • Physics of a Particle on a Rotating Hoop: Experiment and Theory

      Kushal Lodha Anushree Roy Sayan Kar

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      The simple textbook problem of a particle on a vertical, rotating hoop is analysed both in theory and through exper-iments. We begin by detailing out a somewhat generalised theory, where the effect of dry friction as well as the possibility of a shift in the vertical axis of rotation are incorporated. The bifurcation curves (plots of the angular position of stability versus the angular frequency of rotation) are obtained for all cases (i.e. with and without friction and a shift of the axis). Thereafter we present the experimental set-up fabricated by us and elaborate on the various measurements performed. Finally, we demonstrate through our experiments how well the theoretical results on the bifurcation curves tally with the experimental findings. The match between theory and experiment is found to be reasonably satisfactory. We conclude by mentioning how various aspects of this simple problem as well as its generalisations and extensions, are linked with dif-ferent advanced areas of physics.

    • G. P. Thomson’s Experiment of Electron Diffraction

      Chetan Kotabage

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      De Broglie’s hypothesis of the dual nature of matter was confirmed experimentally independently by Davisson-Germer and G. P. Thomson. But most of the textbooks (e.g. [1]) discuss Davisson–Germer experiment. In this article, G. P. Thomson’s experiment of electron diffraction is discussed.

    • A New Look at Classical Mechanics

      Dipanjan Chakraborty

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    • The Theory of Pressure-ionization and its Applications

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      Kothari’s classic paper on the theory of pressure ionization showed that matter can be ionized at high pressure as a logical extension of Saha’s theory of thermal ionization to cold matter. Saha’s theory was applied to non-degenerate electron gas and Kothari considered non-relativistic degenerate electron gas subjected to high pressures, such as occurring in astrophysical objects under their own gravity. He used the virial theorem to predict the degree of ionization as a function of its density. It showed that (i) stellar material in the interiors of white dwarf stars should be fully ionized even at zero temperature, (ii) it is possible for hydrogen to go into a metallic state at high pressures as in the interior of Jupiter and Saturn, (iii) there exists a maximum radius of a non-relativistic degenerate electron gas system (cold body), the value being nearly that of Jupiter.

    • Focus Area Science Technology Summer Fellowship [FAST-SF] – 2021

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    • Science Academies’ Summer Research Fellowship Programme for Students and Teachers 2021

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    • Nightjar or Camoufler-jour

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