Implementing and Characterizing Real-time Broadband RFI Excision for the GMRT Wideband Backend

The Giant Metrewave Radio Telescope (GMRT) is being upgraded to increase the receiver sensitivity. This makes the receiver more susceptible to man-made Radio Frequency Interference (RFI). To improve the receiver performance in presence of RFI, real-time RFI excision (filtering) is incorporated in the GMRT wideband backend (GWB). The RFI filtering system is implemented on FPGA and CPU-GPU platforms to detect and remove broadband and narrowband RFI. The RFI is detected using a threshold-based technique where the threshold is computed using Median Absolute Deviation (MAD) estimator. The filtering is carried out by replacing the RFI samples by either noise samples or constant value or threshold. This paper describes the status of the real-time broadband RFI excision system in the wideband receiver chain of the upgraded GMRT (uGMRT). The test methodology for carrying out various tests to demonstrate the performance of broadband RFI excision at the system level and on radio astronomical imaging experiments are also described.Comment: 7 pages, 7 figure

Anticancer chemotherapy in teenagers and young adults: managing long term side effects.

SSA is supported by the Cambridge Cancer Centre.This is the final version of the article. It first appeared from BMJ Group at http://dx.doi.org/10.1136/bmj.i4567

ExoMars Schiaparelli Direct-to-Earth Observation using GMRT

During the ExoMars Schiaparelli separation event on 16 October 2016 and Entry, Descent, and Landing (EDL) events 3 days later, the Giant Metrewave Radio Telescope (GMRT) near Pune, India, was used to directly observe UHF transmissions from the Schiaparelli lander as they arrive at Earth. The Doppler shift of the carrier frequency was measured and used as a diagnostic to identify key events during EDL. This signal detection at GMRT was the only real‐time aliveness indicator to European Space Agency mission operations during the critical EDL stage of the mission

Tunable Oscillations in the Purkinje Neuron

In this paper, we study the dynamics of slow oscillations in Purkinje neurons in vitro, and derive a strong association with a forced parametric oscillator model. We demonstrate the precise rhythmicity of the oscillations in Purkinje neurons, as well as a dynamic tunability of this oscillation using a photo-switchable compound. We show that this slow oscillation can be induced in every Purkinje neuron, having periods ranging between 10-25 seconds. Starting from a Hodgkin-Huxley model, we also demonstrate that this oscillation can be externally modulated, and that the neurons will return to their intrinsic firing frequency after the forced oscillation is concluded. These results signify an additional functional role of tunable oscillations within the cerebellum, as well as a dynamic control of a time scale in the brain in the range of seconds.Comment: 12 pages, 5 figure

Studies on Novel Bacteria Appeaed in Wastewater Treatment Tanks-Spore-forming Serratia marcescens and Pseudomonas Degrader of Alkylphenols

博士論文 (Doctoral dissertation)doctoral thesi

In vitro Anti Diabetic Potential of Loranthacean Hemi Parasite Helicantes elasticus Desv Danser Collected from Six Different Hosts

In vitro anti-diabetic potential of methanolic extract of Helicantheselasticus(Desv.) Danser growing on six different hosts and thereby comparing the host’s influence on this parasitic plant for this efficacy was studied and statistically analysed. The results showed that Hemiparasite collected from Heveabrasiliensis, Citrus maxima, Anacardiumoccidentale and Saracaasoca were found highly effective in this regard. Highest inhibition on α-amylase was shown by H.elasticuscollected from Heveabrasiliensis where as inhibition of α-glucosidase was found to be highest in hemiparasite obtained from Citrus maxima. The host plants selected under study was also found good in reducing the blood glucose level. The study clearly reveals the fact that, anti-diabetic potential of H.elasticus have significantly influenced by the host trees

Elephant (Field Based) in Natrinai Song

Human life requires language. Without language there is no human life. Civilization and one-to-one communication occurs through language. Man expresses thought through language. Poets have expressed their eloquence and depth of language through song. Because of this, it is necessary to carry out studies on the words they say nowadays. A word in Tamil has not only one meaning but also many meanings. There are no words without meaning. In the Sangam literature, among the eighteen above mentioned texts, the Naritana is placed as the first deposit. This article deals with the etymological analysis of the word 'Elephant' in the narrative songs