927 research outputs found
A Pilot Study Of Antihypertensive Therapy In Cerebrovascular Disease
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/111248/1/j.1532-5415.1967.tb02802.x.pd
Exact expressions for correlations in the ground state of the dense O(1) loop model
Conjectures for analytical expressions for correlations in the dense O
loop model on semi infinite square lattices are given. We have obtained these
results for four types of boundary conditions. Periodic and reflecting boundary
conditions have been considered before. We give many new conjectures for these
two cases and review some of the existing results. We also consider boundaries
on which loops can end. We call such boundaries ''open''. We have obtained
expressions for correlations when both boundaries are open, and one is open and
the other one is reflecting. Also, we formulate a conjecture relating the
ground state of the model with open boundaries to Fully Packed Loop models on a
finite square grid. We also review earlier obtained results about this relation
for the three other types of boundary conditions. Finally, we construct a
mapping between the ground state of the dense O loop model and the XXZ
spin chain for the different types of boundary conditions.Comment: 25 pages, version accepted by JSTA
Initial results from a realtime FRB search with the GBT
We present the data analysis pipeline, commissioning observations and initial
results from the GREENBURST fast radio burst (FRB) detection system on the
Robert C. Byrd Green Bank Telescope (GBT) previously described by Surnis et al.
which uses the 21~cm receiver observing commensally with other projects. The
pipeline makes use of a state-of-the-art deep learning classifier to winnow
down the very large number of false positive single-pulse candidates that
mostly result from radio frequency interference. In our observations totalling
156.5 days so far, we have detected individual pulses from 20 known radio
pulsars which provide an excellent verification of the system performance. We
also demonstrate, through blind injection analyses, that our pipeline is
complete down to a signal-to-noise threshold of 12. Depending on the observing
mode, this translates to peak flux sensitivities in the range 0.14--0.89~Jy.
Although no FRBs have been detected to date, we have used our results to update
the analysis of Lawrence et al. to constrain the FRB all-sky rate to be
per day above a peak flux density of 1~Jy. We also
constrain the source count index which indicates that the
source count distribution is substantially flatter than expected from a
Euclidean distribution of standard candles (where ). We discuss
this result in the context of the FRB redshift and luminosity distributions.
Finally, we make predictions for detection rates with GREENBURST, as well as
other ongoing and planned FRB experiments.Comment: 9 pages, 7 figures, submitted to MNRA
Geometric descriptions of entangled states by auxiliaries varieties
The aim of the paper is to propose geometric descriptions of multipartite
entangled states using algebraic geometry. In the context of this paper,
geometric means each stratum of the Hilbert space, corresponding to an
entangled state, is an open subset of an algebraic variety built by classical
geometric constructions (tangent lines, secant lines) from the set of separable
states. In this setting we describe well-known classifications of multipartite
entanglement such as , for , quantum systems and
a new example with the quantum system.
Our description completes the approach of Miyake and makes stronger
connections with recent work of algebraic geometers. Moreover for the quantum
systems detailed in this paper we propose an algorithm, based on the classical
theory of invariants, to decide to which subvariety of the Hilbert space a
given state belongs.Comment: 32 pages, 15 Tables, 5 Figures. References and remarks adde
Quivers, words and fundamentals
40 pages + Appendices, 9 figures40 pages + Appendices, 9 figure
British Association of dermatologists guidelines for biologic therapy for psoriasis 2020 â a rapid update
The overall aim of the guideline is to provide upâtoâdate, evidenceâbased recommendations on the use of biologic therapies targeting TNF (adalimumab, etanercept, certolizumab pegol, infliximab), IL12/23p40 (ustekinumab), IL17A (ixekizumab, secukinumab), IL17RA (brodalumab) and IL23p19 (guselkumab, risankizumab, tildrakizumab) in adults, children and young people for the treatment of psoriasis; consideration is given to the specific needs of people with psoriasis and psoriatic arthritis
A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations
A Fast Radio Burst with frequency-dependent polarization detected during Breakthrough Listen observations
Here, we report on the detection and verification of Fast Radio Burst FRB
180301, which occurred on UTC 2018 March 1 during the Breakthrough Listen
observations with the Parkes telescope. Full-polarization voltage data of the
detection were captured--a first for non-repeating FRBs--allowing for coherent
de-dispersion and additional verification tests. The coherently de-dispersed
dynamic spectrum of FRB 180301 shows complex, polarized frequency structure
over a small fractional bandwidth. As FRB 180301 was detected close to the
geosynchronous satellite band during a time of known 1-2 GHz satellite
transmissions, we consider whether the burst was due to radio interference
emitted or reflected from an orbiting object. Based on the preponderance of our
verification tests, we find that FRB 180301 is likely of astrophysical origin,
but caution that anthropogenic sources cannot conclusively be ruled out.Comment: Submitted to MNRA
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