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Search Results: 1 - 10 of 545523 matches for " M. De Deo "
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Undergraduate medical students′ research in India
Deo M
Journal of Postgraduate Medicine , 2008,
Abstract:
Observation of beta decay of In-115 to the first excited level of Sn-115
C. M. Cattadori,M. De Deo,M. Laubenstein,L. Pandola,V. I. Tretyak
Physics , 2004, DOI: 10.1016/j.nuclphysa.2004.10.025
Abstract: In the context of the LENS R&D solar neutrino project, the gamma spectrum of a sample of metallic indium was measured using a single experimental setup of 4 HP-Ge detectors located underground at the Gran Sasso National Laboratories (LNGS), Italy. A gamma line at the energy (497.48 +/- 0.21) keV was found that is not present in the background spectrum and that can be identified as a gamma quantum following the beta decay of In-115 to the first excited state of Sn-115 (9/2+ --> 3/2+). This decay channel of In-115, which is reported here for the first time, has an extremely low Q-value, Q = (2 +/- 4) keV, and has a much lower probability than the well-known ground state-ground state transition, being the branching ratio b = (1.18 +/- 0.31) 10^-6. This could be the beta decay with the lowest known Q-value. The limit on charge non-conserving beta decay of In-115 is set at 90% C.L. as tau > 4.1 10^20 y.
Beta decay of 115-In to the first excited level of 115-Sn: Potential outcome for neutrino mass
C. M. Cattadori,M. De Deo,M. Laubenstein,L. Pandola,V. I. Tretyak
Physics , 2005, DOI: 10.1134/S1063778807010140
Abstract: Recent observation of beta decay of 115-In to the first excited level of 115-Sn with an extremely low Q_beta value (Q_beta ~ 1 keV) could be used to set a limit on neutrino mass. To give restriction potentially competitive with those extracted from experiments with 3-H (~2 eV) and 187-Re (~15 eV), atomic mass difference between 115-In and 115-Sn and energy of the first 115-Sn level should be remeasured with higher accuracy (possibly of the order of ~1 eV).
Oomycete transcriptomics database: A resource for oomycete transcriptomes
Sucheta Tripathy, Tejal Deo, Brett M Tyler
BMC Genomics , 2012, DOI: 10.1186/1471-2164-13-303
Abstract: Oomycetes Transcriptomics Database is an integrated transcriptome and EST data resource for oomycete pathogens. The database currently stores processed ABI SOLiD transcript sequences from Phytophthora sojae and its host soybean (P. sojae mycelia, healthy soybean and P. sojae-infected soybean) as well as Illumina transcript sequences from five Hyaloperonospora arabidopsidis libraries. In addition to those resources, it has also a complete set of Sanger EST sequences from P. sojae, P. infestans and H. arabidopsidis grown under various conditions. A web-based transcriptome browser was created for visualization of assembled transcripts, their mapping to the reference genome, expression profiling and depth of read coverage for particular locations on the genome. The transcriptome browser merges EST-derived contigs with NGS-derived assembled transcripts on the fly and displays the consensus. OTD possesses strong query features and the database interacts with the VBI Microbial Database as well as the Phytophthora Transcriptomics Database.Oomycete Transcriptomics Database provides access to NGS transcript and EST data for oomycete pathogens and soybean. The OTD browser is a light weight transcriptome browser that displays the raw read alignment as well as the transcript assembly and expression information quantitatively. The query features offer a wide variety of options including querying data from the VBI microbial database and the Phytophthora transcriptomics database. The database is publicly available at http://www.eumicrobedb.org/transcripts/ webcite.
Artificial Intelligence Tools to Forecast Ocean Waves in Real Time
Pooja Jain and M.C. Deo
The Open Ocean Engineering Journal , 2008, DOI: 10.2174/1874835X00801010013]
Abstract: Prediction of wind generated ocean waves over short lead times of the order of some hours or days is helpful in carrying out any operation in the sea such as repairs of structures or laying of submarine pipelines. This paper discusses an application of different artificial intelligent tools for this purpose. The physical domain where the wave forecasting is made belongs to the western part of the Indian coastline in Arabian Sea. The tools used are artificial neural networks, genetic programming and model trees. Station specific forecasts are made at those locations where wave data are continuously observed. A time series forecasting scheme is employed. Based on a sequence of preceding observations forecasts are made over lead times of 3 hr to 72 hr. Large differences in the accuracy of the forecasts were not seen when alternative forecasting tools were employed and hence the user is free to use any one of them as per her convenience and confidence. A graphical user interface has been developed that operates on the received wave height data from the field and produces the forecasts and further makes them accessible to any user located anywhere in the world.
Anti-leprosy vaccines: current status and future prospects.
Kartikeyan S,Chaturvedi R,Deo M
Journal of Postgraduate Medicine , 1991,
Abstract: Different types of leprosy vaccines are currently used in field trials in India. The rationale behind their use, the parameters for determining their efficacy, their merits and demerits are discussed and the future prospects are highlighted.
Experimental Studies on Electronic Configuration Mixing for the Even-Parity Levels of Gd I Using Isotope Shifts Recorded in the Visible Region with FTS
B. K. Ankush,M. N. Deo
Journal of Spectroscopy , 2013, DOI: 10.1155/2013/741020
Abstract: Electronic configuration (4f76s26p + 4f75d6s6p + 4f75d26p) mixing studies in the high even-parity energy levels of Gd I spectrum have been carried out on the basis of isotope shift (IS) data recorded in 49 spectral lines partially in the visible wavelength region on Fourier Transform Spectrometer (FTS) and the relevant spectral line IS data available in the literature. We employed “Sharing rule” to the experimentally observed level isotope shifts (LIS) of the even-parity levels for finding the percentage composition of each configuration being mixed. An FTS spectrum of Gd I in the region of 365–495?nm acquired employing the highly enriched Gd isotopes in liquid nitrogen cooled hollow cathode lamp (HCL) as a light source and photomultiplier tube as the detector. The studies of altogether 48 even-levels have revealed that amongst the 20 high even parity levels assigned previously to >95% 4f75d6s6p configuration, 10 levels have agreed very well whereas 7 have exhibited large contribution of 4f75d6s6p configuration compared to 4f75d26p configuration and 3 levels have equal contribution of 4f75d6s6p and 4f75d26p configurations. Out of 8 unassigned levels, 6 have dominant 4f75d6s6p configuration compared to 4f75d26p configuration and the remaining two have dominancy in 4f75d26p configuration. 1. Introduction Gadolinium occupies position in the middle of the lanthanide series and has the [Xe] 4f75d6s2 ground state configuration generating highly complex first spectrum of neutral gadolinium atom (Gd I) [1]. For the last few decades many successful attempts have been made to investigate the Gd I spectrum. Albertson [2] in 1935 identified 5 low odd-parity levels of ground term and 35 upper even-parity levels comprising 71 classified spectral transitions. Analyses of arc and spark spectra based on wave numbers and intensities by Russell [3] have led to the energy level classification of 1217 transitions of Gd I with identification of some 200 even-parity levels. Although enriched Gd isotopes have been employed by Speck [4] for the first time for studying IS in the Gd I spectrum their data was confined mainly to investigate the nuclear spins and moments of odd isotopes. Odintsova and Striganov [5] reported IS between all pairs of even isotopes in many strong spectral lines for the first time; however the data was limited to the studies of static deformation parameter and internal quadruple moment for the nucleus of Gd-152 isotope. Electronic configuration assignment studies have been performed on Fabry-Perot Spectrometer (FPS) employing IS as a tool in this
Phase of Aharonov-Bohm oscillations in conductance of mesoscopic systems
P. Singha Deo,A. M. Jayannavar
Physics , 1996,
Abstract: Motivated by a recent experiment we analyze in detail the phase of Aharonov-Bohm oscillations across a 1D ring with a stub coupled to one of its arms, in the presence of a magnetic flux. We demonstrate that there are two kinds of conductance extremas. One class of them are fixed at particular flux values and can only change abruptly from a maxima to a minima as incident energy is varied. We show a different mechanism for such abrupt phase change in conductance oscillation. We demonstrate that these extremas can exhibit $``$phase locking". However, the second kind of extremas can shift continuously as the incident energy is varied.
Persistent Currents in the Presence of a Transport Current
A. M. Jayannavar,P. Singha Deo
Physics , 1995, DOI: 10.1103/PhysRevB.51.10175
Abstract: We have considered a system of a metallic ring coupled to two electron reservoirs. We show that in the presence of a transport current, the persistent current can flow in a ring, even in the absence of magnetic field. This is purely a quantum effect and is related to the current magnification in the loop. These persistent currents can be observed if one tunes the Fermi energy near the antiresonances of the total transmission coefficient or the two port conductance.
Quantum Waveguide Transport in Serial Stub and Loop Structures
P. Singha Deo,A. M. Jayannavar
Physics , 1994,
Abstract: We have studied the quantum transmission properties of serial stub and loop structures. Throughout we have considered free electron networks and the scattering arises solely due to the geometric nature of the problem. The band formation in these geometric structures is analyzed and compared with the conventional periodic potential scatterers. Some essential differences are pointed out. We show that a single defect in an otherwise periodic structure modifies band properties non trivially. By a proper choice of a single defect one can produce positive energy bound states in continuum in the sense of von Neumann and Wigner. We also discuss some magnetic properties of loop structures in the presence of Aharonov-Bohm flux.
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