A viable short-term strategy for breeding composite populations

A viable short-term strategy has been outlined to breed productive composite populations. The major steps in the strategy are generating a base gene pool, reordering it into a productive gene pool by appropriate systems of mating and siphoning composite populations through effective selection. The strategy was field tested in Pennisetum typhoides and Brassica campestris and found efficient. The utility and implication of this strategy are discussed

Single and three way crosses for generating composite populations in rapeseed

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User Cooperation in TDMA Wireless System

Abstract: Reliability of radio link is limited, owing to path loss, shadowing and multi-path fading. This necessitates the use of a certain type of diversity. In recent years, cooperative diversity has gained considerable attention. Here, wireless nodes cooperate in such a way that they share their antennas and other resources, to create a virtual array through distributed transmission and signal processing. This increases coverage and reduces transmitted power, thereby bringing down co-channel interference, which results in increased system capacity. This paper gives an overview of the state of art of various cooperation schemes and issues related to their implementation

Design optimization of Pixel Structure for α-Si based uncooled Infrared detector

In this paper authors present the design and simulation results achieved for pixel structure of amorphous Si (α-Si) based bolometer array. Most uncooled IR detectors in the world are based on VOx material. But this is not a standard material in IC technology and has many inherent disadvantages. The α-Si, an alternative material with high TCR is becoming as popular. However, large TCR values, in this material are achieved only in films of high resistivity. To achieve TCR value more than 2.5%/K, α-Si film resistivity is ~ 80 ohms-cm. This gives rise to very large pixel resistance of the order of 100 Mega ohms depending upon the design of the leg structure. This high pixel resistance causes very large noise and hence lower sensitivity. If leg width or membrane thickness is increased in order to reduce the pixel resistance, then this results in higher thermal conductance which also decreases sensitivity. To overcome this problem, pixel structure is so designed that within a pixel, only part of the electrical conduction is through α-Si and rest is through metal. Simulation using Coventorware software has been done to optimize pixel resistance as well as thermal conductance through legs so that maximum sensitivity could be obtained. Optimization is also carried out in order to reduce sensitivity of pixel resistance to variation in material resistivity.Defence Science Journal, 2013, 63(6), pp.581-588, DOI:http://dx.doi.org/10.14429/dsj.63.575

Inversion of moments to retrieve joint probabilities in quantum sequential measurements

A sequence of moments encode the corresponding probability distribution. Probing if quantum joint probability distribution can be retrieved from the associated set of moments -- realized in the sequential measurement of a dichotomic observable at different time intervals -- reveals a negative answer i.e., the joint probabilities of sequential measurements do not agree with the ones obtained by inverting the moments. This is indeed a reflection of the non-existence of a bonafide grand joint probability distribution, consistent with all the physical marginal probability distributions. Here we explicitly demonstrate that given the set of moments, it is not possible to retrieve the three-time quantum joint probability distribution resulting from quantum sequential measurement of a single qubit dichotomic observable at three different times. Experimental results using a nuclear magnetic resonance (NMR) system are reported here to corroborate these theoretical observations viz., the incompatibility of the three-time joint probabilties with those extracted from the moment sequence.Comment: 7 pages, 5 figures, RevTe

An approach to population improvement in self compatible turnip-rape

A total of 233 single plant selection were made from diverse sources of self-incompatible brown-seeded turnip-rape [Brassica rapa (Linn.) The4ll, emend, Metzger var. napus Linn. Sensu stricto]. The progenies were tested for important attributes during 1978-79. Ten initial gene pools were constituted with the genotypes selected based on critical norm fixed for corresponding component character. An additional population was constituted with genotypes following beyond the critical mean for 5 out of 10 yield attributes. Intra-genepool selective mating in each resulted in high-yielding population, particularly in population where the number of primary branches, plant biomass and single-plant yield were considered for improvement. The study stressed the importance of method of (A) selection of genotypes and (B) selective mating within population in bringing about an overall improvement of seed yield in brown-seeded turnip-rape