18,144 research outputs found
USING TECHNICAL DATA FOR STATE AND LOCAL GROUNDWATER POLICY MAKING
Resource /Energy Economics and Policy,
Exposure to Stressful Environments: Strategy of Adaptive Responses
Any new natural environment may generate a number of stresses (such as hypoxia, water lack, and heat exposure), each of which can produce strains in more than a single organ system. Every strain may in turn stimulate the body to adapt in multiple ways. Nevertheless, a general strategy of the various adaptive responses emerges when the challenges are divided into three groups. The first category includes conditions that affect the supply of essential molecules, while the second is made up by those stresses that prevent the body from regulating properly the output of waste products, such as CO2 and heat. In both classes, there is a small number of responses, similar in principle, regardless of the specific situation. The third unit is created by environments that disrupt body transport systems. Problems may arise when there is a conflict between two stresses requiring conflicting adaptive changes. An alternative to adaptation, creation of micro-environment, is often favored by the animal
Spin and occupation number entanglement of Dirac fields for non-inertial observers
We investigate the Unruh effect on entanglement taking into account the spin
degree of freedom of the Dirac field. We analyze spin Bell states in this
setting, obtaining their entanglement dependance on the acceleration of one of
the partners. Then, we consider simple analogs to the occupation number
entangled state |00>+|11>, but with spin quantum numbers for |11> showing that,
despite their apparent similitude, while the spinless case is always qubit x
qubit, for the spin case acceleration produces a qubit x qu4it state. We also
introduce a procedure to consistently erase the spin information from our
setting preserving occupation numbers. We show how the maximally entangled
state for occupation number emerges from our setting, we also analyze its
entanglement dependance on acceleration, obtaining a greater entanglement
degradation than in the spinless case.Comment: RevTex, 11 pages, 3 figures. The replacement is due to some minor
misprints correction
Local Zeta Functions for Non-degenerate Laurent Polynomials Over p-adic Fields
In this article, we study local zeta functions attached to Laurent
polynomials over p-adic fields, which are non-degenerate with respect to their
Newton polytopes at infinity. As an application we obtain asymptotic expansions
for p-adic oscillatory integrals attached to Laurent polynomials. We show the
existence of two different asymptotic expansions for p-adic oscillatory
integrals, one when the absolute value of the parameter approaches infinity,
the other when the absolute value of the parameter approaches zero. These two
asymptotic expansions are controlled by the poles of twisted local zeta
functions of Igusa type.Comment: The condition on the critical set on the mapping f considered in
Section 2.5 of our article is not sufficient to assure the vanishing of the
twisted local zeta functions (for almost all the characters) as we assert in
Theorem 3.9. A new condition on the mapping f is provide
Deconvolving the Wedge: Maximum-Likelihood Power Spectra via Spherical-Wave Visibility Modeling
Direct detection of the Epoch of Reionization (EoR) via the red-shifted 21-cm
line will have unprecedented implications on the study of structure formation
in the infant Universe. To fulfill this promise, current and future 21-cm
experiments need to detect this weak EoR signal in the presence of foregrounds
that are several orders of magnitude larger. This requires extreme noise
control and improved wide-field high dynamic-range imaging techniques. We
propose a new imaging method based on a maximum likelihood framework which
solves for the interferometric equation directly on the sphere, or equivalently
in the -domain. The method uses the one-to-one relation between spherical
waves and spherical harmonics (SpH). It consistently handles signals from the
entire sky, and does not require a -term correction. The spherical-harmonics
coefficients represent the sky-brightness distribution and the visibilities in
the -domain, and provide a direct estimate of the spatial power spectrum.
Using these spectrally-smooth SpH coefficients, bright foregrounds can be
removed from the signal, including their side-lobe noise, which is one of the
limiting factors in high dynamics range wide-field imaging. Chromatic effects
causing the so-called "wedge" are effectively eliminated (i.e. deconvolved) in
the cylindrical () power spectrum, compared to a
power spectrum computed directly from the images of the foreground visibilities
where the wedge is clearly present. We illustrate our method using simulated
LOFAR observations, finding an excellent reconstruction of the input EoR signal
with minimal bias.Comment: 13 pages, 8 figures. Replaced to match accepted MNRAS version; few
typos corrected & textual clarification added (no changes to results
SOCIAL, ECONOMIC, AND INSTITUTIONAL INCENTIVES TO DRAIN OR PRESERVE PRAIRIE WETLANDS
Land Economics/Use,
USE OF ADR IN EXTENSION PUBLIC POLICY EDUCATION PROGRAMS AND ROLES EXTENSION CAN PLAY IN DISPUTE RESOLUTION
Teaching/Communication/Extension/Profession,
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