http://hdl.handle.net/2248/5067 Wed, 15 Apr 2026 15:49:13 GMT 2026-04-15T15:49:13Z http://hdl.handle.net/2248/8476 Title: Resource Information and Management on Hydra Authors: Parwage, Anish Abstract: TORQUE-3.0.2 with Maui-3.3.1 is used as Resource Manager for HYDRA and performs job scheduling in cluster environment. It looks into the resource requirement for a job and provides the requested resources for the job to run on the cluster. Fortran compilers are available freely from GNU for e.g. gfortran. But there are also proprietary compilers available in the market such as from INTEL, PGI etc. HYDRA has Intel’s ifort fortran compiler which is best suited for Intel architecture. There are two versions of INTEL's ifort fortran compiler installed on HYDRA Description: Restricted Access Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/2248/8476 2015-01-01T00:00:00Z http://hdl.handle.net/2248/8475 Title: A stellar photo-polarimeter Authors: Raveendran, A. V; Srinivasulu, G; Muneer, S; Mekkaden, M. V; Jayavel, N; Somashekar, M. R; Sagayanathan, K; Ramamoorthy, S; Rosario, M. J; Jayakumar, K Abstract: A new astronomical photo-polarimeter that can measure linear polarization of point sources simultaneously in three spectral bands was designed and built in the Institute. The polarimeter has a Calcite beam-displacement prism as the analyzer. The ordinary and extra-ordinary emerging beams in each spectral band are quasi-simultaneously detected by the same photomultiplier by using a high speed rotating chopper. The effective chopping frequency can be set to as high as 200 Hz. A rotating superachromatic Pancharatnam halfwave plate is used to modulate the light incident on the analyzer. The spectral bands are isolated using appropriate dichroic and glass filters. A detailed analysis shows that the reduction of 50% in the efficiency of the polarimeter because of the fact that the intensities of the two beams are measured alternately is partly compensated by the reduced time to be spent on the observation of the sky background. The use of a beam-displacement prism as the analyzer completely removes the polarization of background skylight, which is a major source of error during moonlit nights, especially, in the case of faint stars. The field trials that were carried out by observing several polarized and unpolarized stars show a very high mechanical stability for the polarimeter. The position angle of polarization produced by the Glan-Taylor prism in the light path is found to be slightly wavelengthdependent, indicating that the fixed super-achromatic halfwave plate in the beam does not fully compensate for the variation in the position angle of the effective optical axis of the rotating plate. However, the total amplitude of variation in the U − I spectral region is only 0.◦92. The polarization efficiency is also found to be wavelength-dependent with a total amplitude of 0.271% in the U −I region; its mean value is 99.211%. The instrumental polarization is found to be very low. It is nearly constant in the V − I spectral region ( 0.04%), and apparently, it increases slightly towards the ultraviolet. The observations of polarized stars show that the agreement between the measured polarization values and those available in the literature to be excellent. Description: Restricted Access Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/2248/8475 2015-01-01T00:00:00Z http://hdl.handle.net/2248/8471 Title: Indigenous Development Software for the 90” Mirror coating plant, VBO Authors: Arumugam, V Abstract: A Telescope is an instrument that aids in the observation of stellar and celestial objects. Mirrors are an important subsystem in the Telescope. Over a period, due to weathering effects, reflection efficiency of the mirrors will be reduced. Hence mirrors need to be coated periodically for better efficiency. The coating plant operation can be controlled through software due to the adoption of modern hardware in the plant. This software is developed indigenously for the operations of the 2.8m mirror coating plant, implemented its operation successfully. Description: Restricted Access Wed, 29 May 2024 00:00:00 GMT http://hdl.handle.net/2248/8471 2024-05-29T00:00:00Z http://hdl.handle.net/2248/8470 Title: NTP Server and Weather Monitor for Kodaikanal Solar Observatory Authors: Anand, M. N Abstract: We perceive time as a passage of events, a marker of change. In astronomy and astrophysics, we study events occurring over a short time (order of seconds) to long-term (a few years) variability. Accurate time stamping is essential while recording and analyzing these events. An accurate time server is needed in the local network to ensure precision time. This project is to implement a Stratum-1 network time server at Kodaikanal Solar Observatory using a GPS receiver module and a Raspberry Pi. Similarly, all astronomical observations in the optical spectrum depend on the local weather conditions. A dedicated weather station is an integral part of any observatory. This project also aims to implement continuous weather monitoring and logging using Boltwood Cloud Sensor II connected to the same single-board computer hosting the time server. Description: Restricted Access Wed, 29 May 2024 00:00:00 GMT http://hdl.handle.net/2248/8470 2024-05-29T00:00:00Z