4,088 research outputs found
Issues and Preferences of Horticulture Farmers
A National Farmers Meet (NFM) was organized by Indian Council of Agricultural Research (ICAR) and Tamil Nadu Agricultural University (TNAU) at Regional Research Station (RRS), Paiyur, Tamil Nadu on 14.3.2015. The purpose was to sensitize the farmers about improved horticultural production technologies and obtain first-hand information about issues of horticulture farmers of Karnataka, Tamil Nadu, Andhra Pradesh and Kerala. A brief survey was conducted at NFM with horticulture farmers as respondents (60) through a structured questionnaire. Analysis of the survey data indicated that Mango, Tomato and Marigold are the major fruit, vegetable and ornamental crops cultivated respectively. Non-availability of critical inputs such as fertilizers, seeds/ planting material and lack of remunerative market price are the major issues in contemporary horticulture, apart from unawareness towards improved horticulture production technologies. Field demonstrations and offcampus training programmes are the two major extension interventions preferred by the horticulture farmers; whereas mass media channels are preferred as information sources apart from institutional sources such as development departments and research institutes. Appropriate extension strategies are suggested based on the findings of the survey
A Green's function formalism of energy and momentum transfer in fluctuational electrodynamics
Radiative energy and momentum transfer due to fluctuations of electromagnetic
fields arising due to temperature difference between objects is described in
terms of the cross-spectral densities of the electromagnetic fields. We derive
relations between thermal non-equilibrium contributions to energy and momentum
transfer and surface integrals of tangential components of the dyadic Green's
functions of the vector Helmholtz equation. The expressions derived here are
applicable to objects of arbitrary shapes, dielectric functions, as well as
magnetic permeabilities. For the case of radiative transfer, we derive
expressions for the generalized transmissivity and generalized conductance that
are shown to obey reciprocity and agree with theory of black body radiative
transfer in the appropriate limit.Comment: 12 pages, 2 figure
An accurate, fast, mathematically robust, universal, non-iterative algorithm for computing multi-component diffusion velocities
Using accurate multi-component diffusion treatment in numerical combustion
studies remains formidable due to the computational cost associated with
solving for diffusion velocities. To obtain the diffusion velocities, for low
density gases, one needs to solve the Stefan-Maxwell equations along with the
zero diffusion flux criteria, which scales as , when solved
exactly. In this article, we propose an accurate, fast, direct and robust
algorithm to compute multi-component diffusion velocities. To our knowledge,
this is the first provably accurate algorithm (the solution can be obtained up
to an arbitrary degree of precision) scaling at a computational complexity of
in finite precision. The key idea involves leveraging the fact
that the matrix of the reciprocal of the binary diffusivities, , is low
rank, with its rank being independent of the number of species involved. The
low rank representation of matrix is computed in a fast manner at a
computational complexity of and the Sherman-Morrison-Woodbury
formula is used to solve for the diffusion velocities at a computational
complexity of . Rigorous proofs and numerical benchmarks
illustrate the low rank property of the matrix and scaling of the
algorithm.Comment: 16 pages, 7 figures, 1 table, 1 algorith
Lifshitz theory of van der Waals pressure in dissipative media
We derive a first--principles method of determining the van der Waals or
Casimir pressure in a dissipative and dispersive planar multilayered system by
calculating the Maxwell stress tensor in a fictitious layer of vacuum, that is
eventually made to vanish, introduced in the structure. This is illustrated by
calculating the van der Waals pressure in a thin film with dissipative
properties embedded between two semi--infinite media.Comment: 4 pages, 2 figure
On Minimum Average Stretch Spanning Trees in Polygonal 2-trees
A spanning tree of an unweighted graph is a minimum average stretch spanning
tree if it minimizes the ratio of sum of the distances in the tree between the
end vertices of the graph edges and the number of graph edges. We consider the
problem of computing a minimum average stretch spanning tree in polygonal
2-trees, a super class of 2-connected outerplanar graphs. For a polygonal
2-tree on vertices, we present an algorithm to compute a minimum average
stretch spanning tree in time. This algorithm also finds a
minimum fundamental cycle basis in polygonal 2-trees.Comment: 17 pages, 12 figure
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