8,121 research outputs found
Inter-regional Migration: The UK experience
This paper looks at the scenario of intra-UK migration amongst its four regions. The level of intra-UK migration is significant and is increasing over time. Using several measures of the balance in migration we observe that, broadly speaking, the balance is improving. We also examine the impact of changes in the regional per capita GDPs and unemployment levels on regional migration using panel analysis. Several authors find these to be significant factors in international migration. However, it seems that neither regional per capita GDP nor the unemployment level has a significant effect on regional migration in the UK (although the regression coefficients have the correct signs). In the case of regional migration in the UK, it is other characteristics of the source and destination regions which appear to matter most
Effect of grazing management on the maintenance of white clover
End of Project ReportTeagasc acknowledges the support of the European Union Structural
Funds (EAGGF) and the European Union DGX11 (Science and
Technology for Development Programme, Sub-programme Life Sciences
and Technologies for Developing Countries (ST3) in Contract TS3* CT93
0202) in the financing of this project.The objectives of the project were to compare different cultivar types and
methods to establish and maintain them in reseeded and permanent pastures
as a basis for efficient low cost sheep production. In Ireland only 3% of
pastures are reseeded annually and permanent pastures rarely contain more
than 5% white clover. Improved clover content offers benefits of higher
lamb growth rate and reduced fertiliser N use.
Comparisons under cutting conditions provided no basis for replacement of
Grasslands Huia by the new cultivar Aberherald. Grasslands Huia
established successfully following direct reseeding and rotational grazing by
sheep. It established more quickly than Kentish and gave higher yield only
in the first year. A mixture of small and medium size white clovers should
be sown for sheep grazing. Increasing seeding rate from 2 to 4 kg per ha
increased pasture clover content only in the first year. Grasslands Huia
persisted quite well for up to 5 years under rotational sheep grazing. It also
survived under continuous grazing but leaf size was reduced.
Rotational grazing management with sheep increased the clover content of
permanent pasture from under 2% to 4% over 2 years. Highest clover yields
were achieved with rest intervals of 20 to 28 days. Simulated mixed sheep
and cattle rotational grazing on permanent pasture resulted in intermediate
(10 to 12%) clover dry matter contributions to total dry matter compared
with cattle (15 to 18%) and sheep (5 to 8%). Lamb growth rate was about
35% higher when the clover content of the sward was increased from very
low to about 35%.European Unio
Undergraduate Student Perceptions Regarding the Use of Educational Technology â A Case Study in a Statistics Service Course
Published ArticleIntegrating theory with practice has become a mandatory requirement for universities of technology. Using educational technology to supplement traditional pedagogical approaches has contributed significantly to achieving this mandate. However, which educational technologies could help improve the educational experience of students in a statistical service course? This research uses an exploratory design, where one large group of undergraduate students were polled using a questionnaire as the main data collection tool. Microsoft Excel and PowerPoint presentations were viewed as a very good supplemental educational tool, while YouTube clips, myVUT (institutional learning management system using Sakai) and the business/financial calculator were not fully utilised by the students. However, the majority of students selected the prescribed textbook as the most useful educational tool in understanding first year statistics, as it was a locally published textbook with many native examples. A blend of all these educational technologies helped to enrich student understanding and satisfaction in learning statistical concepts
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The Levelised Cost of Frequency Control Ancillary Services in Australiaâs National Electricity Market
Over the period 2016-2021 Australiaâs National Electricity Market (NEM) experienced an investment supercycle, with 16,000MW of new utility-scale variable renewable plant commitments (and an additional 8,000MW of rooftop solar PV) in a power system with a ratcheted peak demand of 35,000MW. The sharp rise in intermittent asynchronous resources and the disorderly loss of 5,000MW of synchronous coal-fired generation plant placed strains on system security â most visibly represented by the rapid deterioration in the distribution of the power systemsâ (50Hz) Frequency. This in turn necessitated material changes to the NEMâs suite of Frequency Control Ancillary Service (FCAS) markets. Utility-scale batteries are ideally suited for FCAS duties, but unlike the wholesale electricity market, there is no forward price curve for Frequency Control Ancillary Services, nor is there any systematic framework for determining equilibrium prices that might otherwise be used for investment decision-making. In this article, we develop an approach for quantifying long run equilibrium prices in the markets for Frequency Control Ancillary Services, with the intended application being to guide the suitability of utility-scale battery investments under conditions of uncertainty and missing forward FCAS markets
Alternative scenarios to the âbannerâ years: A test of alternative formats to Web banner ads
A test of alternative formats to Web banner ads
Chasing the second gamma-ray bright isolated neutron star: 3EG J1835+5918/RX J1836.2+5925
The EGRET telescope aboard NASAs Compton GRO has repeatedly detected 3EG
J1835+5918, a bright and steady source of high-energy gamma-ray emission with
no identification suggested until recently. The long absence of any likely
counterpart for a bright gamma-ray source located 25 degrees off the Galactic
plane initiated several attempts of deep observations at other wavelengths. We
report on counterparts in X-rays on a basis of a 60 ksec ROSAT HRI image. In
order to conclude on the plausibility of the X-ray counterparts, we reanalyzed
data from EGRET at energies above 100 MeV and above 1 GeV, including data up to
CGRO observation cycle 7. The gamma-ray source location represents the latest
and probably the final positional assessment based on EGRET data. The X-ray
counterparts were studied during follow-up optical identification campaigns,
leaving only one object to be likely associated with the gamma-ray source 3EG
J1835+5918. This object, RX J1836.2+5925, has the characteristics of an
isolated neutron star and possibly of a radio-quiet pulsar.Comment: 5 pages, 3 figures. To appear in the Proceedings of the 270.
WE-Heraeus Seminar on Neutron Stars, Pulsars and Supernova Remnants, Jan.
21-25, 2002, Physikzentrum Bad Honnef, eds W. Becker, H. Lesch & J. Truemper.
Proceedings are available as MPE-Report 27
Are Q-stars a serious threat for stellar-mass black hole candidates?
We examine the status of the threat posed to stellar-mass black hole
candidates by the possible existence of Q-stars (compact objects with an exotic
equation of state which might have masses well above the normally-accepted
maximum for standard neutron stars). We point out that Q-stars could be
extremely compact (with radii less than 1.5 times the corresponding
Schwarzschild radius) making it quite difficult to determine observationally
that a given object is a black hole rather than a Q-star, unless there is
direct evidence for the absence of a solid surface. On the other hand, in order
for a Q-star to have a mass as high as that inferred for the widely-favoured
black hole candidate V404 Cygni, it would be necessary for the Q-matter
equation of state to apply already at densities an order of magnitude below
that of nuclear matter and this might well be considered implausible on
physical grounds. We also describe how rotation affects the situation and
discuss the prospects for determining observationally that black hole
candidates are not Q-stars.Comment: 4 pages Latex, 5 figures, to appear in MNRA
On the time dependent Schwarzschild - de Sitter spacetime
An imperfect cosmic fluid with energy flux is analyzed. Even though its
energy density is positive, the pressure due to the fact
that the metric is asymptotically de Sitter. The kinematical quantities for a
nongeodesic congruence are computed. The scalar expansion is time independent
but divergent at the singularity . Far from the central mass and
for a cosmic time , the heat flux does not depend on
Newton's constant .Comment: 8 pages, no figures, Sections 3 and 5 enlarged, one reference adde
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