RF Signal Distribution subsystem for wind profiler (original) (raw)
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Radar and optical studies of the atmosphere.
2008
The research described in this thesis can be categorized into three main areas. The first area concerns the interpretation of observations of various atmospheric processes and phenomena.
On Small Satellites for Oceanography: A Survey
The recent explosive growth of small satellite operations driven primarily from an academic or pedagogical need, has demonstrated the viability of commercial-off-the-shelf technologies in space. They have also leveraged and shown the need for development of compatible sensors primarily aimed for Earth observation tasks including monitoring terrestrial domains, communications and engineering tests. However, one domain that these platforms have not yet made substantial inroads into, is in the ocean sciences. Remote sensing has long been within the repertoire of tools for oceanographers to study dynamic large scale physical phenomena, such as gyres and fronts, bio-geochemical process transport, primary productivity and process studies in the coastal ocean. We argue that the time has come for micro and nano satellites (with mass smaller than 100 kg and 2 to 3 year development times) designed, built, tested and flown by academic departments, for coordinated observations with robotic assets in situ. We do so primarily by surveying SmallSat missions oriented towards ocean observations in the recent past, and in doing so, we update the current knowledge about what is feasible in the rapidly evolving field of platforms and sensors for this domain. We conclude by proposing a set of candidate ocean observing missions with an emphasis on radar-based observations, with a focus on Synthetic Aperture Radar.
Curriculum-Vitae of Dr. D. Sundar Ram, 2019
Research Contributions of Dr. D. Sundar Ram over a period of 30 Years as UGC Research Associate in Politcal Science at Sri Venkateswara University, Tirupati, Reader and Head of the PG Department of Public Administration at SSN College PG Centre (Acharya Nagarjuna University), Narasaraoapet, Guntur District, Senior Faculty Member in Political Science and Public Administration and Co-ordinator of UGC- NAAC Steering Committee at PNC and KR Degree and PG College (Acharya Nagarjuna University), Narasaraopet, Guntur District and Director of Academy of Grassroots Studies and Research of India (AGRASRI), Tirupati, with 21 Books, 40 Chapters in Edited Books/Volumes, 23 Papers in Research Journals, 30 Conference and Seminar Papers, 10 Theme Papers of the Conferences and Seminars, 9 Book Reviews, 33 Talks in All India Radio, 7 Reports on Conferences and Seminars and 74 Papers in Telugu Magazines and Daily News Papers.
Denardini et al (2016) ASR v58 n10 p1916 1939 doi10.1016 j.asr.2016.03.
The present work is the first of a three-part review on space weather in Latin America. It comprises the evolution of several Latin American institutions investing in space science since the 1960s, focusing on the solar-terrestrial interactions, which today is commonly called space weather. Despite recognizing advances in space research in all of Latin America, this review is restricted to the development observed in three countries in particular (Argentina, Brazil and Mexico), due to the fact that these countries have recently developed operational centers for monitoring space weather. The review starts with a brief summary of the first groups to start working with space science in Latin America. This first part of the review closes with the current status and the research interests of these groups, which are described in relation to the most significant works and challenges of the next decade in order to aid in the solving of space weather open issues.
Review on Space Weather in Latin America. 1. The beginning from Space Science Research
The present work is the first of a three-part review on space weather in Latin America. It comprises the evolution of several Latin American institutions investing in space science since the 1960’s, focusing on the solar-terrestrial interactions, which today is commonly called space weather. Despite recognizing advances in space research in all of Latin America, this review is restricted to the development observed in three countries in particular (Argentina, Brazil and Mexico), due to the fact that these countries have recently developed operational centers for monitoring space weather. The review starts with a brief summary of the first groups to start working with space science in Latin America. This first part of the review closes with the current status and the research interests of these groups, which are described in relation to the most significant works and challenges of the next decade in order to aid in the solving of space weather open issues.
Hydrological Sciences: A report to IAHS 2011
Hydrogeologically, the Indian territories can be divided into three major groups: unconsolidated, semi-unconsolidated and consolidated (or hard rock) formations. Indo-Gangetic plains, dune soil of Thar Desert in the north-west and coastal alluvium of Quaternary to recent ages characterized with the primary porosity form the first group of unconsolidated formations. The Indo-Gangetic plain is traversed by major Himalayan rivers like Indus, Ganges, Brahmaputra, Yamuna and their tributaries.
Tweek is the electromagnetic waves at Extremely Low Frequency (3-3000 Hz) and Very Low Frequency (3-30 kHz) bands, which originates from lightning discharges and propagates about thousands of kilometers in the Earth-Ionosphere waveguide. Recording the tweeks with a maximum up to eighth harmonics using the receiver installed at Tay Nguyen University (12.65P o P N, 108.02P o P E), Buon Ma Thuot, Dak Lak, during January-June 2013, we have studied the morphology of the low-latitude D region ionosphere in the nighttime. The occurrence of tweeks with mode number m = 2-3 is more dominant. Tweeks with higher modes (m ≥ 4) appear less than other tweeks due to the higher attenuation of wave energy for higher modes reflected at the ionospheric D region. The results show that electron density varies from 25.1-189.4 cmP-3 P , corresponding to the tweeks with m = 1-8 at the reflection height from 82.2-86.5 km. The reference height h' and electron density gradient β are higher during summer seasons as compared to those during winter and equinox seasons. The mean values of h' and β are 82.5 km and 0.53 kmP-1 P , respectively. The electron density using the tweek method is lower by about 11-38 % than those obtained using the IRI-2012 model. Keywords: The morphology of the D-region ionosphere, tweek, reflection height, reference height, electron density gradient.