142,684 research outputs found
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
Efficient Reconstruction of Depth Three Arithmetic Circuits with Top Fan-In Two
No full textIn this paper we develop efficient randomized algorithms to solve the black-box reconstruction problem for polynomials over finite fields, computable by depth three arithmetic circuits with alternating addition/multiplication gates, such that output gate is an addition gate with in-degree two. Such circuits naturally compute polynomials of the form G×(T₁ + T₂), where G,T₁,T₂ are product of affine forms computed at the first layer in the circuit, and polynomials T₁,T₂ have no common factors. Rank of such a circuit is defined to be the dimension of vector space spanned by all affine factors of T₁ and T₂. For any polynomial f computable by such a circuit, rank(f) is defined to be the minimum rank of any such circuit computing it. Our work develops randomized reconstruction algorithms which take as input black-box access to a polynomial f (over finite field ), computable by such a circuit. Here are the results.
- [Low rank]: When 5 ≤ rank(f) = O(log³ d), it runs in time (nd^{log³d}log ||)^{O(1)}, and, with high probability, outputs a depth three circuit computing f, with top addition gate having in-degree ≤ d^{rank(f)}.
- [High rank]: When rank(f) = Ω(log³ d), it runs in time (ndlog ||)^{O(1)}, and, with high probability, outputs a depth three circuit computing f, with top addition gate having in-degree two.
Prior to our work, black-box reconstruction for this circuit class was addressed in [Amir Shpilka, 2007; Karnin and Shpilka, 2009; Sinha, 2016]. Reconstruction algorithm in [Amir Shpilka, 2007] runs in time quasi-polynomial in n,d,|| and that in [Karnin and Shpilka, 2009] is quasi-polynomial in d,||. Algorithm in [Sinha, 2016] works only for polynomials over characteristic zero fields. Thus, ours is the first blackbox reconstruction algorithm for this class of circuits that runs in time polynomial in log ||. This problem has been mentioned as an open problem in [Ankit Gupta et al., 2012] (STOC 2012). In the high rank case, our algorithm runs in (ndlog||)^{O(1)} time, thereby significantly improving the existing algorithms in [Amir Shpilka, 2007; Karnin and Shpilka, 2009]
D. P. Sinha, S. Sahai (éd.) : Ramayana Traditions and National Cultures in Asia
No full textPou-Lewitz. D. P. Sinha, S. Sahai (éd.) : Ramayana Traditions and National Cultures in Asia. In: Bulletin de l'Ecole française d'Extrême-Orient. Tome 78, 1991. pp. 339-342
In The City the Body Rests
No full textPublished in Entanglements Journal.
Suggested citation:
Sinha, D. (2021). ‘In the City the Body Rests’, entanglements,
4(2):50-65
Article considers how the author understands storytelling, urban space through personal experience and investigations of Kolkata through an artistic practice.
Online at https://entanglementsjournal.org/in-the-city-the-body-rests/</p
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
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Domestic Violence and US Asylum Law: Eliminating the \u27Cultural Hook\u27 for Claims Involving Gender-Related Persecution
No full textIn this Note, Anita Sinha examines the treatment of asylum claims involving gender-related persecution. Analyzing the three most recent decisions published by the Board of Immigration Appeals, Sinha illustrates that these cases have turned on whether the gender-related violence can be linked to practices attributable to non-Western,\u27foreign cultures. Sinha argues that cases involving gender-related persecution can be given full consideration of asylum law only when their adjudication is based on an understanding of the political and institutional character of violence against women, rather than on cultural culpability. In making this argument, Sinha examines recent amendments to the regulations governing asylum law that have been proposed to improve the adjudication of gender-related claims. Identifying their shortcomings, Sinha offers suggestions to improve the proposed regula-tions so that they would truly mandate equal treatment of asylum claims involving gender-related persecution vis-d-vis more traditional asylum claims
Domestic Violence and US Asylum Law: Eliminating the \u27Cultural Hook\u27 for Claims Involving Gender-Related Persecution
No full textIn this Note, Anita Sinha examines the treatment of asylum claims involving gender-related persecution. Analyzing the three most recent decisions published by the Board of Immigration Appeals, Sinha illustrates that these cases have turned on whether the gender-related violence can be linked to practices attributable to non-Western,\u27foreign cultures. Sinha argues that cases involving gender-related persecution can be given full consideration of asylum law only when their adjudication is based on an understanding of the political and institutional character of violence against women, rather than on cultural culpability. In making this argument, Sinha examines recent amendments to the regulations governing asylum law that have been proposed to improve the adjudication of gender-related claims. Identifying their shortcomings, Sinha offers suggestions to improve the proposed regula-tions so that they would truly mandate equal treatment of asylum claims involving gender-related persecution vis-d-vis more traditional asylum claims
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
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
Geometry and Combinatorics Pertaining to the Homology of Spaces of Knots
No full textWe produce explicit geometric representatives of non-trivial homology classes in
Emb(S1,Rd), the space of knots, when d is even. We generalize results of Cattaneo,
Cotta-Ramusino and Longoni to define cycles which live off of the vanishing line of
a homology spectral sequence due to Sinha. We use con figuration space integrals to
show our classes pair non-trivially with cohomology classes due to Longoni.
We then give an alternate formula for the first differential in the homology
spectral sequence due to Sinha. This differential connects the geometry of the cycles
we define to the combinatorics of the spectral sequence. The new formula for the
differential also simplifies calculations in the spectral sequence
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