15,078 research outputs found
Macroeconomic Effects of the Stock Management for Irrigation and Drainage Facilities in Japan: Application of Recursive- Dynamic CGE model
The stock management of irrigation and drainage facilities was macro-economically evaluated. The recursive-dynamic CGE model was developed and used for policy simulation. Results demonstrated that effects of activity spread to other industries and total benefit calculated by the consumersâ surplus change was more than the total costs.Computable General Equilibrium Model, Recursive dynamic model, Consumersâ surplus, Cost-benefit ratio, Agricultural and Food Policy, Community/Rural/Urban Development, Demand and Price Analysis, Production Economics, Public Economics, H30, Q12, Q14, Q18,
Bifurcation Analysis of the Watt Governor System
This paper pursues the study carried out by the authors in {\it Stability and
Hopf bifurcation in the Watt governor system} \cite{smb}, focusing on the
codimension one Hopf bifurcations in the centrifugal Watt governor differential
system, as presented in Pontryagin's book {\it Ordinary Differential
Equations}, \cite{pon}. Here are studied the codimension two and three Hopf
bifurcations and the pertinent Lyapunov stability coefficients and bifurcation
diagrams, illustrating the number, types and positions of bifurcating small
amplitude periodic orbits, are determined. As a consequence it is found a
region in the space of parameters where an attracting periodic orbit coexists
with an attracting equilibrium.Comment: 34 pages, 9 figure
Environmental Influences on the Morphology and Dynamics of Group Size Haloes
We use group size haloes identified with a ``friends of friends'' (FOF)
algorithm in a concordance GADGET2 (dark matter only)
simulation to investigate the dependence of halo properties on the environment
at . The study is carried out using samples of haloes at different
distances from their nearest massive {\em cluster} halo. We find that the
fraction of haloes with substructure typically increases in high density
regions. The halo mean axial ratio also increases in overdense regions,
a fact which is true for the whole range of halo mass studied. This can be
explained as a reflection of an earlier halo formation time in high-density
regions, which gives haloes more time to evolve and become more spherical.
Moreover, this interpretation is supported by the fact that, at a given
halo-cluster distance, haloes with substructure are more elongated than their
equal mass counterparts with no substructure, reflecting that the virialization
(and thus sphericalization) process is interrupted by merger events. The
velocity dispersion of low mass haloes with strong substructure shows a
significant increase near massive clusters with respect to equal mass haloes
with low-levels of substructure or with haloes found in low-density
environments. The alignment signal between the shape and the velocity ellipsoid
principal axes decreases going from lower to higher density regions, while such
an alignment is stronger for haloes without substructure. We also find, in
agreement with other studies, a tendency of halo major axes to be aligned and
of minor axes to lie roughly perpendicular with the orientation of the filament
within which the halo is embedded, an effect which is stronger in the proximity
of the massive clusters.Comment: 11 pages, 12 figures, accepted for publication in MNRA
Hopf Bifurcations in a Watt Governor With a Spring
This paper pursues the study carried out by the authors in "Stability and
Hopf bifurcation in a hexagonal governor system", focusing on the codimension
one Hopf bifurcations in the hexagonal Watt governor differential system. Here
are studied the codimension two, three and four Hopf bifurcations and the
pertinent Lyapunov stability coefficients and bifurcation diagrams, ilustrating
the number, types and positions of bifurcating small amplitude periodic orbits,
are determined. As a consequence it is found an open region in the parameter
space where two attracting periodic orbits coexist with an attracting
equilibrium point.Comment: 30 pages and 7 figure
Critical phenomena in N=4 SYM plasma
Strongly coupled N=4 supersymmetric Yang-Mills plasma at finite temperature
and chemical potential for an R-symmetry charge undergoes a second order phase
transition. We demonstrate that this phase transition is of the mean field
theory type. We explicitly show that the model is in the dynamical universality
class of 'model B' according to the classification of Hohenberg and Halperine,
with dynamical critical exponent z=4. We study bulk viscosity in the mass
deformed version of this theory in the vicinity of the phase transition. We
point out that all available models of bulk viscosity at continuous phase
transition are in conflict with our explicit holographic computations.Comment: 52 pages, 10 figure
Feedback control of spin systems
The feedback stabilization problem for ensembles of coupled spin 1/2 systems
is discussed from a control theoretic perspective. The noninvasive nature of
the bulk measurement allows for a fully unitary and deterministic closed loop.
The Lyapunov-based feedback design presented does not require spins that are
selectively addressable. With this method, it is possible to obtain control
inputs also for difficult tasks, like suppressing undesired couplings in
identical spin systems.Comment: 16 pages, 15 figure
The 3-Loop Non-Singlet Heavy Flavor Contributions and Anomalous Dimensions for the Structure Function and Transversity
We calculate the massive flavor non-singlet Wilson coefficient for the heavy
flavor contributions to the structure function in the asymptotic
region and the associated operator matrix element to 3-loop order in Quantum Chromodynamics at general values of the
Mellin variable . This matrix element is associated to the vector current
and axial vector current for the even and the odd moments , respectively. We
also calculate the corresponding operator matrix elements for transversity,
compute the contributions to the 3-loop anomalous dimensions to and
compare to results in the literature. The 3-loop matching of the flavor
non-singlet distribution in the variable flavor number scheme is derived. All
results can be expressed in terms of nested harmonic sums in space and
harmonic polylogarithms in -space. Numerical results are presented for the
non-singlet charm quark contribution to .Comment: 82 pages, 3 style files, 33 Figure
General Solutions for Tunneling of Scalar Fields with Quartic Potentials in de Sitter Space
The tunneling rates for scalar fields with quartic potentials in de Sitter
space in the limit of no gravitational back reaction are calculated numerically
and the results are fitted by analytic formulae.Comment: (Contours in Figure 1 corrected, two-dimensional fitting coefficient
corrected, references added.), 16 pages, KUNS 124
Impact of raw ham quality and tumbling time on the technological properties of polyphosphate-free cooked ham
The effect of tumbling time (5 h30, 19 h and 26 h) and raw ham quality (superior, inferior or mixed quality) on the quality of polyphosphate-free cooked ham was investigated. The water holding capacity and total yield of the polyphosphate-free tumbled hams were dependent on both tumbling time and ham quality. Higher values of both parameters were obtained with an increase in tumbling time from 5 h30 to 19 h and with superior hams. The exudate after 19 h and 26 h tumbling showed a higher gel forming ability compared to 5 h30, which, in case of polyphosphate-free cooked hams produced with mixed and inferior meat quality, resulted in a better sliceability (less holes). However, tumbling time did not affect hardness, which was only influenced by ham quality, resulting in a softer polyphosphate-free cooked ham produced with inferior ham quality compared to the other quality classes
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