6,648 research outputs found
Potash for pastures.
Insofar as potassium is concerned, dairying in the South-West part of the State is a rather exhaustive type of farming. In the main, this is due to the necessity for cutting hay and removing it from the paddocks on which it was grown. The potassium in a two-ton crop of clover hay is at least equal to that in 90 lb. of potash fertiliser and is often much more
Clover ley farming in Western Australia : an important research project
IT is an accepted fact that the pasture period developed as an alternative to cropping in areas where cereals are grown results in increased fertility and a potential for higher cereal crop yields
Soil analyses
Soil samples are often received at the Department of Agriculture together with a request that chemical analyses be done and that advice be given concerning mineral deficiencies which analysis may reveal. Unfortunately soil analyses are seldom satisfactory for determining fertiliser requirements or treatment for soils. The uses and limitations of soil analyses for mineral elements, for salinity and for pH are discussed in the following article
Potassium for Subterranean clover
There are a number of areas in the south-western portion of the State where, although adequate quantities of superphosphate and trace elements have been applied, the growth of pasture species, particularly subterranean clover, has declined. In some cases, subterranean clover has disappeared completely. Investigations have shown that in many instances the decreased production is due to potassium deficiency
Mass Spectra of N=2 Supersymmetric SU(n) Chern-Simons-Higgs Theories
An algebraic method is used to work out the mass spectra and symmetry
breaking patterns of general vacuum states in N=2 supersymmetric SU(n)
Chern-Simons-Higgs systems with the matter fields being in the adjoint
representation. The approach provides with us a natural basis for fields, which
will be useful for further studies in the self-dual solutions and quantum
corrections. As the vacuum states satisfy the SU(2) algebra, it is not
surprising to find that their spectra are closely related to that of angular
momentum addition in quantum mechanics. The analysis can be easily generalized
to other classical Lie groups.Comment: 17 pages, use revte
Symmetry Breaking in the Schr\"odinger Representation for Chern-Simons Theories
This paper discusses the phenomenon of spontaneous symmetry breaking in the
Schr\"odinger representation formulation of quantum field theory. The analysis
is presented for three-dimensional space-time abelian gauge theories with
either Maxwell, Maxwell-Chern-Simons, or pure Chern-Simons terms as the gauge
field contribution to the action, each of which leads to a different form of
mass generation for the gauge fields.Comment: 16pp, LaTeX , UCONN-94-
A review of agriculture on the Esperance Downs
Esperance is approaching a period of rapid development based on the results of research at Esperance Downs Research Station and on farmers\u27 properties in the area.
This article reviews the soils, vegetation, climate, agricultural development and development costs of the area
Perturbative Analysis of Nonabelian Aharonov-Bohm Scattering
We perform a perturbative analysis of the nonabelian Aharonov-Bohm problem to
one loop in a field theoretic framework, and show the necessity of contact
interactions for renormalizability of perturbation theory. Moreover at critical
values of the contact interaction strength the theory is finite and preserves
classical conformal invariance.Comment: 12 pages in LaTeX, uses epsf.sty, 5 uuencoded Postscript figures sent
separately. MIT-CTP-228
Non-static Dimensional Reduction of QED_3 at Finite Temperature
We study an extreme non-static limit of 2+1-dimensional QED obtained by
making a dimensional reduction so that all fields are spatially uniform but
time dependent. This dimensional reduction leads to a 0+1-dimensional field
theory that inherits many of the features of the 2+1-dimensional model, such as
Chern-Simons terms, time-reversal violation, an analogue of parity violation,
and global U(2) flavor symmetry. At one-loop level, interactions induce a
Chern-Simons term at finite T with coefficient tanh(beta m_F/2), where m_F is
the fermion mass. The finite temperature two loop self-energies are also
computed, and are non-zero for all temperatures.Comment: 28 pp, 11 figures, uses axodraw.st
Cassiopeia A: dust factory revealed via submillimetre polarimetry
If Type-II supernovae - the evolutionary end points of short-lived, massive
stars - produce a significant quantity of dust (>0.1 M_sun) then they can
explain the rest-frame far-infrared emission seen in galaxies and quasars in
the first Gyr of the Universe. Submillimetre observations of the Galactic
supernova remnant, Cas A, provided the first observational evidence for the
formation of significant quantities of dust in Type-II supernovae. In this
paper we present new data which show that the submm emission from Cas A is
polarised at a level significantly higher than that of its synchrotron
emission. The orientation is consistent with that of the magnetic field in Cas
A, implying that the polarised submm emission is associated with the remnant.
No known mechanism would vary the synchrotron polarisation in this way and so
we attribute the excess polarised submm flux to cold dust within the remnant,
providing fresh evidence that cosmic dust can form rapidly. This is supported
by the presence of both polarised and unpolarised dust emission in the north of
the remnant, where there is no contamination from foreground molecular clouds.
The inferred dust polarisation fraction is unprecedented (f_pol ~ 30%) which,
coupled with the brief timescale available for grain alignment (<300 yr),
suggests that supernova dust differs from that seen in other Galactic sources
(where f_pol=2-7%), or that a highly efficient grain alignment process must
operate in the environment of a supernova remnant.Comment: In press at MNRAS, 10 pages, print in colou
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