190,886 research outputs found
Quantum stop times
No full textThe notion of stop-time can be naturally translated in a
quantum probabilistic framework and this problem has been
studied by several authors [1], [2], [3], [4], [5].
Recently Parthasarathy and Sinha [4] have established a
factorization property of the -space over the Wiener space
(regarded as the Fock space over )
based on the notion of quantum stop time which is a quantum
probabilistic analogue of the strong Markov property. In this
note we prove a stronger result which has no classical
analogue namely that the algebra generated by the stopped Weyl
operators in the sense of [4] (i.e.the past algebra with
respect to a stop time S), is the algebra of all the bounded
operators on of the Wiener space
Variability In The Ecoraces Of Tropical Tasar Sillkworm Antheraea Mylitta Drury
No full textTropical tasar silkworm, Antheraea mylitta Drury is exploited in countries for commercial silk production and improved varieties of these silkworms can be evolved by employing various breeding techniques. As the insect has established itself in various forms of ecological populations (Commonly called as ecoraces) in different geographical niches of the country depending on food plants and micro-environmental conditions available to them, the species exists in the form of nearly 44 ecoraces (Singh and Srivastava,1997, Srivastava,2002 and Srivastava et at. 2007) distributed over different states. However, due to free interbreeding in nature for centuries, the fauna is highly heterogeneous.

Tasar culture is a forest based industry being practiced as tradition, since time immemorial by the tribes of Central India, extending from West Bengal in the East to Karnataka in South. The species A. mylitta D. is polyphagous in nature. The present study comprises the ecoraces of tropical tasar silkworm of A. mylitta D. These ecoraces are mainly restricted in the tropical moist deciduous forest area where the average rainfall varies between 1200-2000 mm and the deciduous zone of the dry tropical forest area where the average rainfall has been observed to be about 1000 mm. The Primary food plants of the insects are Terminalia tomentosa, Terminalia arjuna and Shorea robusta and secondary food plants are Terminalia chebula, T. bellerica, T. peniculata, Zizyphus jujuba etc. The phenotypic and genotypic variability is very much prominent. The present review paper comprises the extent and degree of natural variation in tropical tasar silkworm A. mylitta D
Book Review - Reviewing S. Prakash Sinha, What Is Law? (1989)
No full textBook Review Extract:
The title of S.P. Sinha\u27s book, What Is Law?, is somewhat deceptive, for the author ambitiously tries to do more than merely define the concept of law in well under 300 pages. After the introductory historical and philosophical overview of his initial chapter, Sinha uses the balance of his book to summarize the major theories of law, including how law arises, how it is applied, and why it is important in society. The work is less of an original attempt by its writer to answer the question posed by the title than it is an effort to seek such an answer by means of surveying- albeit briefly in each instance -the views of the major thinkers in this field
Influence of bottom topography on integral constraints in zonal flows with parameterized potential vorticity fluxes
No full textAn integral constraint for eddy fluxes of potential vorticity (PV), corresponding to global momentum conservation, is applied to two-layer zonal quasi-geostrophic channel flow. This constraint must be satisfied for any type of parameterization of eddy PV fluxes. Bottom topography strongly influence the integral constraint compared to a flat bottom channel. An analytical solution for the mean flow solution has been found by using asymptotic expansion in a small parameter which is the ratio of the Rossby radius to the meridional extent of the channel. Applying the integral constraint to this solution, one can find restrictions for eddy PV transfer coefficients which relate the eddy fluxes of PV to the mean flow. These restrictions strongly deviate from restrictions for the channel with flat bottom topography
A model of cooperative R&D among competitors
No full text"Revision: January 1990."Includes bibliographical references (p. 29-32).Deepak K. Sinha and Michael A. Cusumano
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Coupling the PLANKTOM5.0 marine ecosystem model to the OCCAM 1º ocean general circulation model for investigation of the sensitivity of global biogeochemical cycles to variations in ecosystem complexity and physical environment
No full textThe earliest marine ecosystem models consisted of a simple representation of the main features of marine ecosystems, including, typically, variables for phytoplankton, zooplankton, nutrient and detritus (NPZD models). These have been incorporated into ocean general circulation models to give a basic representation of ecosystem function, providing predictions of bulk quantities such as global primary production, export and biomass which can be compared with available observations. A recent trend has been to increase the number of phytoplankton and zooplankton groups modelled, as analogues of different plankton groups observed to exist in the ocean, for example diatoms and cocolithophores (the so-called plankton functional type or PFT approach). It is usually assumed that the increase in complexity of the model will result in simulated ecosystems which more faithfully reproduce observations than NPZD models, but this has not been demonstrated systematically. The robustness of the PFT models to changes in model parameters and to changes to the physical environment in which it is embedded, have not been investigated. As a first step towards these goals, we incorporate a state-of-the-art PFT model, PLANKTOM5.0 into the OCCAM ocean general circulation model. A 6 year simulation is performed, covering the years 1989-1994 with identical parameter choices to an existing run of PLANKTOM5.0 coupled to the OPA general circulation model. This document describes the development of the coupled model and the 6 year simulation. Comparison with the OPA model and sensitivity of the solution to parameter choices will be described in a forthcoming journal paper
Relationship of changes in strain rate indices estimated from velocity-encoded MR imaging to loss of muscle force following disuse atrophy
No full textPurpose: This study explores changes in strain rate (SR) (rate of regional deformation) parameters extracted from velocity-encoded MRI and their relationship to muscle force loss following 4-week unilateral lower limb suspension in healthy humans. Methods: Two-dimensional SR maps were derived from three directional velocity-encoded MR phase-contrast images of the medial gastrocnemius in seven subjects. Atrophy-related and regional differences in the SR eigenvalues, angle between the SR and muscle fiber (SR-fiber angle), and strain rates in the fiber basis were statistically analyzed using analysis of variance and linear regression. Results: During isometric contraction, SR in the fiber cross section (SRin-plane) was significantly lower, and the SR-fiber angle was significantly higher postsuspension (P < 0.05). On multiple variable regression analysis, the volume of medial gastrocnemius, SRin-plane, and SR-fiber angle were significantly associated with force and changes in the, and the SR eigenvalues and shear SR were significantly associated with change in force with disuse. Conclusions: Changes in SR-fiber angle, SRin-plane, and shear SR as well as their ability to predict force and force changes may reflect the role of remodeling of the extracellular matrix in disuse atrophy and its functional consequence in reducing lateral transmission of force. Magn Reson Med 79:912–922, 2018. © 2017 International Society for Magnetic Resonance in Medicine. © 2017 International Society for Magnetic Resonance in Medicin
Ramesh Chandra Sinha (1934–2020)
No full textRamesh Chandra Sinha, a highly respected internationally recognized plant virologist, died peacefully in Ottawa, Canada, on June 14, 2020. He was born on February 10, 1934, in Bareilly, India. His outstanding achievements include the identification of wound tumor virus (WTV) multiplication sites in its leafhopper vector and the development of cost-effective tools for the detection of phytoplasmas and mycotoxins. Additionally, his research findings on the economically important barley yellow dwarf virus (BYDV) laid the foundation for the control of diseases caused by this virus in cereal crops
Westward moving waves or eddies (Storms) on the Subtropical/Azores Front near 32.5°N? Interpretation of the Eulerian currents and temperature records at moorings 155 (35.5°W) and 156 (34.4°W)
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