• science_march
  • panel_discussion
  • agm
  • anpa
  • pri-kas(2018)
  • wrc_python_workshop
march0 dis1 agm2 anpa3 pri-kas(2018)4 wrc_python_workshop5
ABOUT US

Physics Research Initiative (PRI) Pokhara is a group of researchers formed by academic faculties and young professional physicists with an aim to inspire young researcher and promote science literacy in general public. The three main areas of PRI are Research, Outreach, and Awareness on science and technology. PRI is working closely with Department of Physics at Prithvi Narayan Campus to conduct its various scientific programs. Since its inception in 2017, PRI has organized twenty one scientific talks in a series called “Scientific Discussion Series”; three workshops in to empower young researcher with computational techniques, three “Friday Science Social” programs; observation of “National Science Day” in Pokhara, and a couple of outreach program in a public library and in a secondary school. PRI has also formed a “Feynman Study Circle” to engage undergraduate physics students in learning and discussing “textbook” physics.

OUR MISSIONS

  • To motivate and encourage research culture.
  • Train young researcher in computational and other research skills in physics.
  • To bridge the gap between scientists and community via public outreach communication.
  • To promote scientific temper.

RECENT SCIENCE DISCUSSION SERIES (EPISODE - 33)

Size-segregated Compositional Analysis, Measurement Techniques and Aerosol Optical Properties

Abstract

Knowledge of atmospheric particle size distributions (PSDs) is important for understanding a variety of atmospheric components, such as characteristics of aerosol light scattering and absorption, influence of aerosol chemical components in aerosol optical properties. Here, an analytical method has been implied to size segregated aerosol particles of the continental, rural, urban and marine region for finding the variability of aerosol size distribution at different background locations. Different techniques are used for measuring the absorption and scattering of aerosol particles and in this study measurement of aerosol absorption coefficient is explained based on filter techniques, in which size segregated aerosol particles of diameters less than diameter of 1 micrometer and 10 micrometer are collected by using a two-stage high flow non-rotating Micro-Orifice Uniform Cascade Impactor (MOUDI). These filter samples are used for reflectance techniques where monochromatic and integrating reflecting spheres are used for measuring the light absorption coefficient. The absorption coefficient can be used to determine the single scattering albedo (SSA) and are used to specify the chemical components of aerosol particles. SSA of aerosol particles different background locations are presented in this study by using previously published research data in Peer Reviewed Journals. Comparing SSA with size segregated particle concentration, seasonal variability of aerosol optical properties of different locations of different surroundings are investigated for local aerosol source.

DrA
Rudra Aryal*

*Rudra Aryal was born in Palpa. He has received his Ph.D. degree in Physics from the University of Miami, Florida, USA and his M.Sc. and B.Sc. degrees in Physics from Tribhuvan University, Kritipur and Trichandra College Kathmandu, Nepal. He is a former joint secretary of Nepal Physical Society (2000-2002/ 2002-2004). Currently, he is Professor of Physics at Franklin Pierce University, New Hampshire USA. His research focuses on air pollution especially on the interaction of solar radiation with surface level and column integrated atmospheric pollutant (aerosol) particles.

Date: 14 January, 2019
29 Poush, 2076

OUR FUNDING CAMPAIGN