1,944 research outputs found
Profitability of Irrigated Improved Pecan Orchards in the Southern Plains
The objective was to determine if an irrigated improved pecan orchard is economical relative to agronomic systems commonly implemented by producers that have access to irrigation. Results show that the improved pecan orchard is more profitable than competitive enterprises after a twenty year time frame, but is sensitive to pecan price, pecan yield and attitude toward risk.Profitability, Irrigated, Pecan, Orchard, Southern Plains, Crop Production/Industries, Farm Management, Land Economics/Use, Production Economics, Risk and Uncertainty,
Orthogonality relations for conical functions of imaginary order
Orthogonality relations for conical or Mehler functions of imaginary order
are derived and expressed in terms of the Dirac delta function. This work
extends recently derived orthogonality relations of associated Legendre
functions
Continuous quivers of type A (I) Foundations
We generalize type quivers to continuous type quivers and prove
initial results about pointwise finite-dimensional (pwf) representations. We
classify the indecomosable pwf representations and provide a decomposition
theorem, recovering results of Botnan and Crawley-Boevey. We also classify the
indecomposable pwf projective representations. Finally, we prove that many of
the properties of finite-dimensional type representations are present in
finitely generated pwf representations. This is the self-contained foundational
part of a series of works to study a generalization of continuous clusters
categories and their relationship to other type cluster structures.Comment: 29 pages. Revised to be a self-contained treatment with a focus on
representation theoretic method
The genetic algorithm as a discovery engine: Strange circuits and new principles
This paper examines the idea of a genetic or evolutionary algorithm being an inspirational or discovery engine. This is illustrated in the particular context of designing electronic circuits. We argue that by connecting pieces of logic together and testing them to see if they carry out the desired function it may be possible to discover new principles of design, and new algebraic techniques. This is illustrated in the design of binary circuits, particularly arithmetic functions, where we demonstrate that by evolving a hierarchical series of examples, it becomes possible to re-discover the well known ripple-carry principle for building adder circuits of any size. We also examine the much
harder case of multiplication. We show also that extending the work into the field of multiple-valued logic, the genetic algorithm is able to produce fully working circuits that lie outside conventional algebra. In addition we look at the issue of principle extraction from evolved data
Experimental evidence of shock mitigation in a Hertzian tapered chain
We present an experimental study of the mechanical impulse propagation
through a horizontal alignment of elastic spheres of progressively decreasing
diameter , namely a tapered chain. Experimentally, the diameters of
spheres which interact via the Hertz potential are selected to keep as close as
possible to an exponential decrease, , where the
experimental tapering factor is either ~% or ~%.
In agreement with recent numerical results, an impulse initiated in a
monodisperse chain (a chain of identical beads) propagates without shape
changes, and progressively transfer its energy and momentum to a propagating
tail when it further travels in a tapered chain. As a result, the front pulse
of this wave decreases in amplitude and accelerates. Both effects are
satisfactorily described by the hard spheres approximation, and basically, the
shock mitigation is due to partial transmissions, from one bead to the next, of
momentum and energy of the front pulse. In addition when small dissipation is
included, a better agreement with experiments is found. A close analysis of the
loading part of the experimental pulses demonstrates that the front wave adopts
itself a self similar solution as it propagates in the tapered chain. Finally,
our results corroborate the capability of these chains to thermalize
propagating impulses and thereby act as shock absorbing devices.Comment: ReVTeX, 7 pages with 6 eps, accepted for Phys. Rev. E (Related papers
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