S. Mazumdar

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Electroluminescence in organic light-emitting diodes arises from a charge-transfer reaction between the injected positive and negative charges by which they combine to form singlet excitons that subsequently decay radiatively. The quantum yield of this process (the number of photons generated per electron or hole injected) is often thought to have a(More)
We report three surprising results regarding the nature of the spatial broken symmetries in the two-dimensional ͑2D͒, quarter-filled band with strong electron-electron interactions that provides a microscopic model of the 2:1 cationic organic charge-transfer solids ͑CTS's͒. First, in direct contradiction to the predictions of one-electron theory, we find a(More)
We present a study of the effects of simultaneous charge and spin frustration on the two-dimensional strongly correlated quarter-filled band on an anisotropic triangular lattice. Our conclusions are based on exact diagonalization studies that include electron-electron interactions as well as adiabatic electron-phonon coupling terms treated(More)
Critical dimension is the minimum number of features that is required to ensure the performance of a learning machine to be “high”. This critical dimension is usually unique to the learning machine and the ranking algorithm combination. Medical- and bio-informatics datasets are different from most other datasets in that there is an imbalance(More)
We examine two recently proposed models of charge ordering ͑CO͒ in the nominally 1 4-filled, quasi-one-dimensional ͑1D͒ organic charge-transfer solids ͑CTS͒. The two models are characterized by site charge density ''cartoons''. .. respectively. We use the Peierls-extended Hubbard model to incorporate both electron-electron (e-e) and electron-phonon (e-ph)(More)
The theory of the 2k F and 4k F instabilities in quarter-lled band organic conductors is revisited. The phase angles of the 2k F bond and charge density waves are shown to change as electron correlation is turned on, and this switching of the phase angle is critical for understanding the bond distortion patterns in the real materials. Intersite Coulomb(More)
Noise estimation and avoidance are becoming very important issues in today's high performance IC design. This paper presents a much improved, highly accurate and efficient noise model called 2-π model for the estimation of crosstalk noise. The proposed model incorporates all the physical properties including victim and aggressor drivers, distributed(More)
The paper tries to analyse the technical feasibility of optimizing the excess energy consumption in a quench blower using a variable frequency drive. Major application engineering considerations, like the cycle time of the blower and the mechanical stresses generated in the mechanical system of the blower, are analysed using computer simulation taking a(More)
All birds construct nests to lay eggs and/or to raise offspring. Scientific description on the nest materials of Black Kite Milvus migrans govinda is very few and is particularly lacking in urban landscape. Therefore, the present study was carried out on three nests of Black Kites collected from different regions of Kolkata metropolis, India to generate(More)
Research on raptors in general in India is scanty, and it is practically non-existent on black kites (Milvus migrans govinda) which are the major scavenging raptor in many urban areas. The aim of this study was to analyse the seasonal abundance and roosting behaviour of black kites in an urban metropolis. Data on the abundance and behaviour of roosting(More)