17,064 research outputs found
Equal Employment Opportunity Commission, Plaintiff, v. The Kroger Co., Defendant and International Brotherhood of Teamsters Local 745, Rule 19(a) Defendant.
Non-Fermi-liquid behavior and anomalous suppression of Landau damping in layered metals close to ferromagnetism
We analyse the low-energy physics of nearly ferromagnetic metals in two
spatial dimensions using the functional renormalization group technique. We
find a new low-energy fixed point, at which the fermionic (electron-like)
excitations are non-Fermi-liquid () and the magnetic fluctuations
exhibit an anomalous Landau damping whose rate vanishes as in the low- limit. We discuss
this renormalization of the Landau-damping exponent, which is the major novel
prediction of our work, and highlight the possible link between that
renormalization and neutron-scattering data on UGe and related compounds.
Implications of our analysis for YFeAl are also discussed.Comment: 5 pages, 3 figures; action modified to include spin of fermions,
resulting in quantitative changes to exponents but same essential physic
A four year longitudinal sero-epidemiological study of bovine herpesvirus type-1 (BHV-1) in adult cattle in 107 unvaccinated herds in south west England
Background: Bovine herpesvirus type-1 (BHV-1) is an important pathogen of cattle that presents with a
variety of clinical signs, including the upper respiratory tract infection infectious bovine rhinotracheitis
(IBR). A seroepidemiological study of BHV-1 antibodies was conducted in England from 2002 – 2004: 29,782 blood samples were taken from 15,736 cattle from 114 herds which were visited on up to three occasions. Antibody concentration was measured using a commercial ELISA. Farm management
information was collected using an interview questionnaire, and herd size and cattle movements were obtained from the cattle tuberculosis testing database and the British Cattle Movement Service. Hierarchical statistical models were used to investigate associations between cattle and herd variables and the continuous outcome percentage positive (PP) values from the ELISA test in unvaccinated herds.
Results: There were 7 vaccinated herds, all with at least one seropositive bovine. In unvaccinated herds 83.2% had at least one BHV-1 seropositive bovine, and the mean cattle and herd BHV-1 seroprevalence were 42.5% and 43.1% respectively. There were positive associations between PP value, age, herd size, presence of dairy cattle. Adult cattle in herds with grower cattle had lower PP values than those in herds without grower cattle. Purchased cattle had significantly lower PP values than homebred cattle, whereas
cattle in herds that were totally restocked after the foot-and-mouth epidemic in 2001 had significantly higher PP values than those in continuously stocked herds. Samples taken in spring and summer had significantly lower PP values than those taken in winter, whereas those taken in autumn had significantly higher PP values than those taken in winter. The risks estimated from a logistic regression model with a binary outcome (seropositive yes/no) were similar.
Conclusion: The prevalence of BHV-1 seropositivity in cattle and herds has increased since the 1970s.
Although the study population prevalence of BHV-1 was temporally stable during study period, the
associations between serological status and cattle age, herd size, herd type, presence of young stock and
restocked versus continuously stocked herds indicate that there is heterogeneity between herds and so
potential for further spread of BHV-1 within and between herds
A four year longitudinal sero-epidemiology study of Neospora caninum in adult cattle from 114 cattle herds in south west England : associations with age, herd and dam-offspring pairs
Background: Neosporosis caused by the protozoan parasite Neospora caninum, is an economically
important cause of abortion, stillbirth, low milk yield, reduced weight gain and premature culling in
cattle. Consequently, a seroepidemiological study of N. caninum antibodies was conducted in
England with 29,782 samples of blood taken from 15,736 cattle from 114 herds visited on three
occasions at yearly intervals. Herds were categorised into lower (< 10%) and higher (≥ 10%)
median herd seroprevalence. Hierarchical models were run to investigate associations between the
sample to positive (S/P) ratio and herd and cattle factors.
Results: Ninety-four percent of herds had at least one seropositive cow; 12.9% of adult cattle had
at least one seropositive test. Approximately 90% of herds were seropositive at all visits; 9 herds
(8%) changed serological status between visits. The median N. caninum seroprevalence in positive
herds was 10% (range 0.4% to 58.8%). There was a positive association between the serostatus of
offspring and dams that were ever seropositive. In the hierarchical model of low seroprevalence
herds there was no significant association between S/P ratio and cattle age. There was a significantly
lower S/P ratio in cattle in herds that were totally restocked after the foot-and-mouth epidemic of
2001 compared with those from continuously stocked herds and cattle purchased into these herds
had a higher S/P ratio than homebred cattle. In the model of high seroprevalence herds the S/P ratio
increased with cattle age, but was not associated with restocking or cattle origin.
Conclusion: There were no strong temporal changes in herd seroprevalence of N. caninum but
90% of herds had some seropositive cattle over this time period. Vertical transmission from
seropositive dams appeared to occur in all herds. In herds with a high seroprevalence the increasing
S/P ratio in 2–4 year old cattle is suggestive of exposure to N. caninum: horizontal transmission
between adult cattle, infection from a local source or recrudescence and abortions. Between-herd
movements of infected cattle enhance the spread of N. caninum, particularly into low
seroprevalence herds. Some restocked herds had little exposure to N. caninum, while in others
infection had spread in the time since restocking
Deep Multitask Learning for Semantic Dependency Parsing
We present a deep neural architecture that parses sentences into three
semantic dependency graph formalisms. By using efficient, nearly arc-factored
inference and a bidirectional-LSTM composed with a multi-layer perceptron, our
base system is able to significantly improve the state of the art for semantic
dependency parsing, without using hand-engineered features or syntax. We then
explore two multitask learning approaches---one that shares parameters across
formalisms, and one that uses higher-order structures to predict the graphs
jointly. We find that both approaches improve performance across formalisms on
average, achieving a new state of the art. Our code is open-source and
available at https://github.com/Noahs-ARK/NeurboParser.Comment: Proceedings of ACL 201
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