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Cosine Modulated Non-Uniform Filter Banks  [PDF]
Jyotsna Ogale, Samrat Ashok
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.23024
Abstract: Traditional designs for non-uniform filter bank (NUFB) are usually complex; involve complicated nonlinear optimization with a large number of parameters and lack of linear phase ([LP) property. In this paper, we describe a simple design method for multirate near perfect reconstruction (NPR) cosine modulated filter banks with non-uniform frequency spacing and linear phase property that involves optimization of only single parameter. It is derived from the uniform cosine modulated filter bank (CMFB) by merging some relevant band pass filters. The design procedure and the structure of the uniform CMFB are mostly preserved in the non-uniform implementation. Compared to other design methods our method provides very good design and converges very rapidly but the method is applicable, only if the upper band edge frequency of each non-uniform filter is an integral multiple of the bandwidth of the corresponding band. The design examples are presented to show the superiority of the proposed method over existing one.
Ro-vibrational dynamics of N2O in superfluid 4He nano-droplets
Samrat Dey,Ashok K. Jha,Yatendra S. Jain
Physics , 2011,
Abstract: In this paper we use the important interferences of Macro-Orbital theory of superfluidity clubbed with several factors that can change the rotational constant (B) and vibrational frequency of N2O in 4HeN-N2O clusters with N to account for the results of their recently reported spectroscopic studies which conclude that: (i) in spite of the fact that 4He atoms provide an interactive medium, the rotational spectrum of the clusters shows sharp peaks, similar to that of the molecule in gaseous state, indicating that the molecule rotates like a free rotor, (ii) B decreases monotonically from N = 1 to 6, remains nearly constant for N = 6 to 8 and increases for N = 9 to 10 with small oscillations there after and (iii) vibrational frequency exhibits blue shift for N = 1 to 5 and a red shift for higher N.
Quantum dynamics of OCS molecule doped in superfluid 4He nanodroplet
Ashok K. Jha,Samrat Dey,Yatendra S. Jain
Physics , 2011,
Abstract: In this paper, we explain the change of rotational constant (B) and vibrational frequency shift of 4HeN-OCS clusters with N by using important inferences of Macro-Orbital theory of superfluidity and several other factors that can change B and vibrational frequency. Consequently, this helps us in understanding the extra ordinary experimental observations that (i) B decreases monotonically from N = 1 to 9 and rises thereafter to follow broad oscillations with maxima at N = 24, 47 and minima at 36 and 62 and (ii) vibrational frequency shift has blue shift for N ~ 1 - 6, with steady red shift thereafter having a change in slope at N ~ 17.
Quantum dynamics of molecules in 4He nano-droplets: Microscopic Superfluidity
Samrat Dey,Jeeban Pd. Gewali,Ashok K. Jha,Lalmuanawma Chhangte,Yatendra S. Jain
Physics , 2011, DOI: 10.1007/s12648-011-0156-x
Abstract: High resolution spectroscopy of doped molecules in 4He nano-droplets and clusters gives a signature of superfluidity in microscopic system, termed as microscopic superfluidity. Ro-vibrational spectrum of 4HeN-M clusters is studied with the help of some important observations, revealed from experiments (viz., localised and orderly arrangement of 4He atoms, although, being free to move in the order of their locations; individual 4He atoms can not be tagged as normal/ superfluid, etc.) and other factors (e.g., consideration that the 4He atoms which happen to fall in the plane of rotation of a molecule, render a equipotential ring and thus, do not take part in rotation; etc.) which effect the rotational and vibrational spectrum of the system. This helps us in successfully explaining the experimental findings which state that the rotational spectrum of clusters have sharp peaks (indicating that the molecule rotates like a free rotor) and moment of inertia and vibrational frequency shift have a non-trivial dependence on N.
Evaluation of impression smears in the diagnosis of fungal keratitis
Chatterjee Samrat
Indian Journal of Ophthalmology , 2007,
The impact of upper tropospheric friction and Gill-type heating on the location and strength of the Tropical Easterly Jet: Idealized physics in a dry Atmospheric General Circulation Model
Samrat Rao
Physics , 2015,
Abstract: An atmospheric general circulation model (AGCM) with idealized and complete physics has been used to evaluate the Tropical Easterly Jet (TEJ) jet. In idealized physics, the role of upper tropospheric friction has been found to be important in getting realistic upper tropospheric zonal wind patterns in response to heating. In idealized physics, the location and strength of the TEJ as a response to Gill heating has been studied. Though the Gill model is considered to be widely successful in capturing the lower tropospheric response, it is found to be inadequate in explaining the location and strength of the upper level TEJ. Heating from the Gill model and realistic upper tropospheric friction does not lead to the formation of a TEJ.
Surgical treatment of thyroid related upper eyelid retraction
Indian Journal of Ophthalmology , 1984,
Unraveling the Design Principle for Motif Organization in Signaling Networks
Samrat Chatterjee, Dhiraj Kumar
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0028606
Abstract: Cellular signaling networks display complex architecture. Defining the design principle of this architecture is crucial for our understanding of various biological processes. Using a mathematical model for three-node feed-forward loops, we identify that the organization of motifs in specific manner within the network serves as an important regulator of signal processing. Further, incorporating a systemic stochastic perturbation to the model we could propose a possible design principle, for higher-order organization of motifs into larger networks in order to achieve specific biological output. The design principle was then verified in a large, complex human cancer signaling network. Further analysis permitted us to classify signaling nodes of the network into robust and vulnerable nodes as a result of higher order motif organization. We show that distribution of these nodes within the network at strategic locations then provides for the range of features displayed by the signaling network.
"String of Pearls" following Nd:YAG laser posterior capsulotomy
Chatterjee Samrat,Garg Prashant
Indian Journal of Ophthalmology , 2002,
Abstract: Posterior capsular re-opacification can occur following Nd-YAG capsulotomy. This necessitates multiple capsulotomies with its potential complications. We report one such case and discuss possible predisposing factors and preventive measures for this condition
Fungal keratitis in Lattice dystrophy
Chatterjee Samrat,Agrawal Deepshikha
Indian Journal of Ophthalmology , 2010,
Abstract: We report a case of fungal keratitis occurring in a patient with lattice dystrophy. A 57-year-old farmer presented with a corneal ulcer following probable entry of paddy husk in the right eye, of one month duration. Corneal scraping revealed pigmented fungal filaments while culture grew Alternaria alternata. Treatment with 5% natamycin eye drops and 1% atropine healed the infection in four weeks. We would like to draw attention to the fact that the cornea in lattice dystrophy is prone to frequent erosions and is a compromised epithelial barrier to invasion by microorganisms. Patients must be made aware of this fact and should seek attention at the earliest following any trivial trauma. Management of minor corneal abrasions in them should be directed at healing the epithelium with adequate lubricants and preventing infection with topical antibiotic prophylaxis.
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