April-2017 Colloquium

Date : 26-04-2017
Time : 16:00:00
Speaker : Mr. Satishchandra C Wani
TeamIndus , Thermal Control System
Area : DEAN'S OFFICE
Venue : K.R.Ramanathan Auditorium, PRL

Abstract

TeamIndus, is the only Indian participant for GLXP mission and is a strong contender amongst final four international teams. By participating in this mission, TeamIndus, a private space company, shall attempt to land on the moon, and be the fourth in the world after US, USSR and China. This presentation gives an overview of the mission and the different subsystems of the GLXP spacecraft. The competition requires travel on Moon’s surface for 500 m and transmission of high definition images and video to the Earth. To achieve this TeamIndus is also sending a Rover on its spacecraft. The talk shall also discuss many interesting challenges in the path of achieving the moon-shot. Apart from the mission TeamIndus believes in engaging people through its many interesting engagement program viz. Lab2Moon, MOONSHOT Wheels, Million2Moon et al that also shall be briefly touched upon during the presentation.

Date : 19-04-2017
Time : 16:00:00
Speaker : Dr. Rajesh Kumar Kushawaha
Scientist - SD, AMOPH Division
Area : DEAN'S OFFICE
Venue : K. R. Ramanathan Auditorium, PRL

Abstract

Atoms and molecules are quantum systems on which many foundation experiments of Quantum mechanics were performed. The structure and dynamics of such systems play a vital role in understanding of the various physical and chemical processes occurring in nature. The nuclear dynamics is ranging from picosecond to femtosecond time domain whereas the electron dynamics is in attosecond time scale. The processes occurring in this time domain are named as ultrafast processes. Understanding the time-resolved ultrafast processes has opened a new direction in atomic and molecular physics, where the evolution dynamics and subsequence changes in molecular structure are probed during the reactions. This has led to the possibility of controlling chemical reaction for molecular engineering. The probing the electron and nuclear dynamics in time domain has given an opportunity to make molecular movies which give us dynamical, structural and products information in given molecular reactions. In this colloquium, the science and techniques to probe the ultrafast processes in molecular systems will be discussed. A few ultrafast processes such as photo-induced dynamics in molecular fragmentation and collapsing of molecular wave packets as per the Copenhagen interpretation, the Young double slit-type interference in polyatomic molecules and probing the molecular wave packets will be demonstrated during the talk. Finally, the molecular alignment and probing the electronic and nuclear wave packets by pump-probe scheme will also be discussed and a movie on molecular alignment will be shown.

Date : 12-04-2017
Time : 16:00:00
Speaker : Dr. Amitava Guharay
Reader, Space and Atmospheric Sciences Division.
Area : DEAN'S OFFICE
Venue : K. R. Ramanathan Auditorium, PRL

Abstract

Waves are one of the most dominant controlling agents of dynamics of the atmosphere. They are generally excited by disturbances in the lower atmosphere and propagate to higher altitudes. The most important feature of the waves is its property of transporting energy and momentum from the lower to the middle and upper atmosphere and thus control and modify large scale circulation and dynamical condition of the ambient atmosphere. Waves play as an important agent of dynamical coupling of various atmospheric regions. Most prominent waves having significant impact on global dynamics are categorized as gravity waves, tides and planetary waves. Atmospheric oscillations are generated by wave and mean flow interactions. In this presentation the characteristic features of these waves and oscillations will be discussed along with recent observations from various parts of the globe.

Date : 05-04-2017
Time : 16:00:00
Speaker : Dr. Arvind Singh
Reader, Geosciences Division
Area : DEAN'S OFFICE
Venue : K. R. Ramanathan Auditorium, PRL

Abstract

Until recently, research in oceanography was limited to mapping the oceans and exploring the surrounding lands – resembling a great similarity to geography. Due to the importance of oceans’ role in regulating the earth’s climate, oceanographers have been spurred to understand the processes that occur in the ocean. The northern Indian Ocean provides a unique opportunity to understand such processes. This colloquium will give a historical perspective of oceanography as a subject with a focus on the role of bioavailable nitrogen for ocean organisms.