37,271 research outputs found
LOCAL ECONOMIC IMPACTS OF CONSERVATION RESERVE PROGRAM ENROLLMENTS: A SUB-COUNTY ANALYSIS
Community/Rural/Urban Development,
Booms and busts: consumption, house prices and expectations
Over much of the past 25 years, the cycles of house price and consumption growth have been closely
synchronised. Three main hypotheses for this co-movement have been proposed in the literature.
First, that an increase in house prices raises households’ wealth, particularly for those in a position to
trade down the housing ladder, which increases their desired level of expenditure. Second, that
house price growth increases the collateral available to homeowners, reducing credit constraints and
thereby facilitating higher consumption. And third, that house prices and consumption have tended
to be influenced by common factors. This paper finds that the relationship between house prices and
consumption is stronger for younger than older households, which appears to contradict the wealth
channel. These findings therefore suggest that common causality has been the most important factor
behind the link between house price and consumption
Field-guided proton acceleration at reconnecting X-points in flares
An explicitly energy-conserving full orbit code CUEBIT, developed originally
to describe energetic particle effects in laboratory fusion experiments, has
been applied to the problem of proton acceleration in solar flares. The model
fields are obtained from solutions of the linearised MHD equations for
reconnecting modes at an X-type neutral point, with the additional ingredient
of a longitudinal magnetic field component. To accelerate protons to the
highest observed energies on flare timescales, it is necessary to invoke
anomalous resistivity in the MHD solution. It is shown that the addition of a
longitudinal field component greatly increases the efficiency of ion
acceleration, essentially because it greatly reduces the magnitude of drift
motions away from the vicinity of the X-point, where the accelerating component
of the electric field is largest. Using plasma parameters consistent with flare
observations, we obtain proton distributions extending up to gamma-ray-emitting
energies (>1MeV). In some cases the energy distributions exhibit a bump-on-tail
in the MeV range. In general, the shape of the distribution is sensitive to the
model parameters.Comment: 14 pages, 4 figures, accepted for publication in Solar Physic
Electrometry using the quantum Hall effect in a bilayer 2D electron system
We discuss the development of a sensitive electrometer that utilizes a
two-dimensional electron gas (2DEG) in the quantum Hall regime. As a
demonstration, we measure the evolution of the Landau levels in a second,
nearby 2DEG as the applied perpendicular magnetic field is changed, and extract
an effective mass for electrons in GaAs that agrees within experimental error
with previous measurements.Comment: 3.5 pages, 3 figures, submitted to APL
A core sampler for silage
FOR five years now the Dairy Division of the Department of Agriculture has conducted a silage competition on behalf of the Australian Dairy Produce Board Pasture Improvement Committee.
The competition is for farmers in the Southwest dairying districts and has attracted an increasing number of entries each year
Origin of the hysteresis in bilayer 2D systems in the quantum Hall regime
The hysteresis observed in the magnetoresistance of bilayer 2D systems in the
quantum Hall regime is generally attributed to the long time constant for
charge transfer between the 2D systems due to the very low conductivity of the
quantum Hall bulk states. We report electrometry measurements of a bilayer 2D
system that demonstrate that the hysteresis is instead due to non-equilibrium
induced current. This finding is consistent with magnetometry and electrometry
measurements of single 2D systems, and has important ramifications for
understanding hysteresis in bilayer 2D systems.Comment: 4 pages, 3 figs. Accepted for publication in PR
Silage making in the lower South-West
The history of silage making in the South-West of Western Australia is typified by periods of relatively intense activity followed by periods when the activity virtually ceases.
The recent rise in popularity has followed the introduction of machinery or methods which tend to make the job easier to handle, or which improve the quality of the silage
Kikuyu renovation points for tyne cultivators
FARMERS throughout the South-West have been faced with the problem of finding a method for renovating paddocks which have been established with kikuyu grass and paspalum over a long period. Both these grasses tend to produce a dense rootbound turf of varying depth which is very difficult to manage with conventional implements. If incompletely grazed, particularly during spring and early summer, kikuyu will form a dense spongy mass as much as three to four inches deep above the ground which effectively prevents the growth of all other species and considerably reduces the vigour of the grass
Separating E and B types of polarization on an incomplete sky
Detection of magnetic-type (-type) polarization in the Cosmic Microwave
Background (CMB) radiation plays a crucial role in probing the relic
gravitational wave (RGW) background. In this paper, we propose a new method to
deconstruct a polarization map on an incomplete sky in real space into purely
electric and magnetic polarization type maps, and
, respectively. The main properties of our
approach are as follows: Firstly, the fields and
are constructed in real space with a minimal loss
of information. This loss of information arises due to the removal of a narrow
edge of the constructed map in order to remove various numerical errors,
including those arising from finite pixel size. Secondly, this method is fast
and can be efficiently applied to high resolution maps due to the use of the
fast spherical harmonics transformation. Thirdly, the constructed fields,
and , are scalar
fields. For this reason various techniques developed to deal with temperature
anisotropy maps can be directly applied to analyze these fields. As a concrete
example, we construct and analyze an unbiased estimator for the power spectrum
of the -mode of polarization . Basing our results on the
performance of this estimator, we discuss the RGW detection ability of two
future ground-based CMB experiments, QUIET and POLARBEAR.Comment: 43 pages, 15 figures, 1 table. The finial version, will appear in PR
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