pp 719-720 August 2017 General Article
pp 721-721 August 2017 Science Smiles
pp 725-729 August 2017 Article-in-a-Box
pp 731-746 August 2017 General Article
Walter Kohn transformed theoretical chemistry and solid statephysics with his development of density functional theory, forwhich he was awarded the Nobel Prize. This article tries toexplain, in simple terms, why this was an important advancein the field, and to describe precisely what it was that he (togetherwith his collaborators Pierre Hohenberg and Lu JeuSham) achieved.
pp 747-759 August 2017 General Article
Principal component analysis (PCA) is the most commonlyused chemometric technique. It is an unsupervised patternrecognition technique. PCA has found applications in chemistry,biology, medicine and economics. The present work attemptsto understand how PCA work and how can we interpretits results.
pp 761-767 August 2017 General Article
Media is abuzz with advertisements of multitude of antibacterialproducts ranging from toothpastes, toilet soaps, andhandwashes to disinfectants and cosmetics. While, almostevery manufacturer claims that their product has 100% efficiencyin eliminating microbes, the truth really is questionable.On 2 September 2016, the Food and Drug Administrationof USA, banned 19 compounds used in antibacterialproducts. These ingredients, as per FDA experts, are not effectiveas antibacterials as they are claimed to be, and fewof them even have adverse effects on humans. India is thelargest consumer of such antibacterial products, but is yet totake any regulatory measures against these products. Thisarticle focus on the need of creating large scale public awarenessabout these products.
pp 769-780 August 2017 General Article
The article explains the importance of the convolution productof two sequences or two functions.
pp 781-785 August 2017 General Article
The article describes the theorietical work in the field of condensedmatter physics for which the 2016 Nobel Prize in Physicswas awarded.
pp 787-800 August 2017 General Article
Topological insulators are new class of materials which arecharacterized by a bulk band gap like ordinary band insulatorsbut have protected conducting states on their edgesor surfaces. These states emerge due to the combination ofspin-orbit coupling and time reversal symmetry. Also, thesestates are insensitive to scattering by non-magnetic impurities.A two-dimensional topological insulator has one dimensionaledge states in which the spin-momentum locking ofthe electrons give rise to quantum spin Hall effect. A threedimensionaltopological insulator supports novel spin-polarized2D Dirac fermions on its surface. These topological insulatormaterials have been theoretically predicted and experimentallyobserved in a variety of 2D and 3D systems, includingHgTe quantum wells, BiSb alloys, and Bi2Te3, Bi2Se3 crystals.Moreover, proximity induced superconductivity in these systemscan lead to a state that supports zero energy Majoranafermions, and the phase is known as topological superconductors.In this article, the basic idea of topological insulatorsand topological superconductors are presented alongwith their experimental development.
pp 801-807 August 2017 Classroom
In this series of articles, the authors discuss various phenomena in fluid dhynamics, which may be investigated via tabletop experiments using low-cost or home-made instruments. The sixth article in this series explores crystalline defects and motion of dislocations using bubble rafts.
pp 809-811 August 2017 Classics
pp 813-813 August 2017 Information and Announcements
pp 814-814 August 2017 Information and Announcements
pp 815-815 August 2017 Information and Announcements
pp 816-816 August 2017 Information and Announcements
pp 817-817 August 2017 Flowering Trees
Volume 25 | Issue 6