1,444 research outputs found
Studies on the mouth parts and sucking apparatus in the blood-sucking diptera
Philcematomyia insignis is a small greyish-brown fly, found throughout the
Oriental region, and recorded also from Tropical Africa. The genus is closely
allied to Musca, and in general appearance, breeding habits, venation, etc., there
is little to distinguish it. The characteristic feature, on account of which the
genus was founded, is the presence of a ring of stout chitinous teeth at the tip of
the proboscis. It is, in fact, in spite of its innocent appearance, a voracious bloodsucker. It preys exclusively, so far as is known, on cattle, and in the neighbourhood of this Institute it is much the commonest blood-sucking fly found on them.
It is especially fond of feeding on the abdomen of calves which have been shaved
for vaccination. Both male and female suck blood, and possibly also feed on
the dung in which their eggs are laid.The proboscis is completely retractile, like that of Musca, and it is only exceptionally the case that the teeth can be seen in dried specimens ; even if the proboscis happens to be extended the teeth are not visible unless the labellar walls
are retracted so as to disclose them. It is therefore probable that it will be found
to be much commoner and more widely distributed than the present records state,
when it is more systematically looked for
Psychiatry, the Inmate and the Law
In August of 1971, the Solicitor General of Canada appointed a committee of psychiatrists to advise him on the treatment of mentally ill inmates. The committee completed its work and reported in May 1972. The report, entitled The General Program for the Development of Psychiatric Services in Federal Correctional Services in Canada1 developed in the space of sixty pages, including appendices, a general program for expanding psychiatric services and facilities in the field of corrections in Canada. In his forward to the Report, the Solicitor General, Warren Allmand, announces that he is profoundly impressed by the recommendations made by this authoritative body . Further, he has directed that the psychiatric services of the federal Correctional Services be developed as the Psychiatric Services Report suggests. At the same time he indicates that comments on the program would be welcome
Proposals on Kaplan–Meier plots in medical research and a survey of stakeholder views: KMunicate
OBJECTIVES: To examine reactions to the proposed improvements to standard Kaplan–Meier plots, the standard way to present time-to-event data, and to understand which (if any) facilitated better depiction of (1) the state of patients over time, and (2) uncertainty over time in the estimates of survival. DESIGN: A survey of stakeholders’ opinions on the proposals. SETTING: A web-based survey, open to international participation, for those with an interest in visualisation of time-to-event data. PARTICIPANTS: 1174 people participated in the survey over a 6-week period. Participation was global (although primarily Europe and North America) and represented a wide range of researchers (primarily statisticians and clinicians). MAIN OUTCOME MEASURES: Two outcome measures were of principal importance: (1) participants’ opinions of each proposal compared with a ‘standard’ Kaplan–Meier plot; and (2) participants’ overall ranking of the proposals (including the standard). RESULTS: Most proposals were more popular than the standard Kaplan–Meier plot. The most popular proposals in the two categories, respectively, were an extended table beneath the plot depicting the numbers at risk, censored and having experienced an event at periodic timepoints, and CIs around each Kaplan–Meier curve. CONCLUSION: This study produced a high response number, reflecting the importance of graphics for time-to-event data. Those producing and publishing Kaplan–Meier plots—both authors and journals—should, as a starting point, consider using the combination of the two favoured proposals
A Search for 6.7 GHz Methanol Masers in M33
We report the negative results from a search for 6.7 GHz methanol masers in
the nearby spiral galaxy M33. We observed 14 GMCs in the central 4 kpc of the
Galaxy, and found 3 sigma upper limits to the flux density of ~9 mJy in
spectral channels having a velocity width of 0.069 km/s. By velocity shifting
and combining the spectra from the positions observed, we obtain an effective
3sigma upper limit on the average emission of ~1mJy in a 0.25 km/s channel.
These limits lie significantly below what we would expect based on our
estimates of the methanol maser luminosity function in the Milky Way. The most
likely explanation for the absence of detectable methanol masers appears to be
the metallicity of M33, which is modestly less than that of the Milky Way
Two-channel Kondo model as a generalized one-dimensional inverse square long-range Haldane-Shastry spin model
Majorana fermion representations of the algebra associated with spin, charge,
and flavor currents have been used to transform the two-channel Kondo
Hamiltonian. Using a path integral formulation, we derive a reduced effective
action with long-range impurity spin-spin interactions at different imaginary
times. In the semiclassical limit, it is equivalent to a one-dimensional
Heisenberg spin chain with two-spin, three-spin, etc. long-range interactions,
as a generalization of the inverse-square long-range Haldane-Shastry spin
model. In this representation the elementary excitations are "semions", and the
non-Fermi-liquid low-energy properties of the two-channel Kondo model are
recovered.Comment: 4 pages, no figure, to be published in J. Phys.: Condens. Matter,
200
Low energy properties of M-state tunneling systems in metals: New candidates for non-Fermi-liquid systems
We construct a generalized multiplicative renormalization group
transformation to study the low energy dynamics of a heavy particle tunneling
among different positions and interacting with independent conduction
electron channels. Using a -expansion we show that this M-level scales
towards a fixed point equivalent to the channel
Coqblin-Schrieffer model. Solving numerically the scaling equations we find
that a realistic M-level system scales close to this fixed point (FP) and its
Kondo temperature is in the experimentally observable range .Comment: 11 Latex pages, to appear in Phys. Rev. Lett, Figures available from
the author by reques
On The Multichannel Kondo Model"
A detailed and comprehensive study of the one-impurity multichannel Kondo
model is presented. In the limit of a large number of conduction electron
channels , the low energy fixed point is accessible to a
renormalization group improved perturbative expansion in . This
straightforward approach enables us to examine the scaling, thermodynamics and
dynamical response functions in great detail and make clear the following
features: i) the criticality of the fixed point; ii) the universal non-integer
degeneracy; iii) that the compensating spin cloud has the spatial extent of the
order of one lattice spacing.Comment: 28 pages, REVTEX 2.0. Submitted to J. Phys.: Cond. Mat. Reference
.bbl file is appended at the end. 5 figures in postscript files can be
obtained at [email protected]. The filename is gan.figures.tar.z and
it's compressed. You can uncompress it by using commands: "uncompress
gan.figures.tar.z" and "tar xvf gan.figures.tar". UBC Preprin
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