4,238 research outputs found
Exchange Narrowing Effects in the EPR Linewidth of Gd Diluted in Ce Compounds
Anomalous thermal behavior on the EPR linewidths of Gd impurities diluted in
Ce compounds has been observed. In metals, the local magnetic moment EPR
linewidth, \Delta H, is expected to increase linearly with the temperature. In
contrast, in Ce_{x}La_{1-x}Os_{2} the Gd EPR spectra show a nonlinear increase.
In this work, the mechanisms that are responsible for the thermal behavior of
the EPR lines in Ce_{x}La_{1-x}Os_{2} are examined. We show that the exchange
interaction between the local magnetic moments and the conduction electrons are
responsible for the narrowing of the spectra at low temperatures. At high
temperatures, the contribution to the linewidth of the exchange interaction
between the local magnetic moments and the ions has an exponential
dependence on the excitation energy of the intermediate valent ions. A complete
fitting of the EPR spectra for powdered samples is obtained.Comment: 11 pages, 1 figur
'Selling it as a holistic health provision and not just about condoms ?' Sexual health services in school settings: current models and their relationship with sex and relationships education policy and provision
In this article we discuss the findings from a recent study of UK policy and practice in relation to sexual health services for young people, based in - or closely linked with - schools. This study formed part of a larger project, completed in 2009, which also included a systematic review of international research. The findings discussed in this paper are based on analyses of interviews with 51 service managers and questionnaire returns from 205 school nurses. Four themes are discussed. First, we found three main service permutations, in a context of very diverse and uneven implementation. Second, we identified factors within the school context that shaped and often constrained service provision; some of these also have implications for sex and relationships education (SRE). Third, we found contrasting approaches to the relationship between SRE input and sexual health provision. Fourth, we identified some specific barriers that need to be addressed in order to develop 'young people friendly' services in the school context. The relative autonomy available to school head teachers and governors can represent an obstacle to service provision - and inter-professional collaboration - in a climate where, in many schools, there is still considerable ambivalence about discussing 'sex' openly. In conclusion, we identify areas worthy of further research and development, in order to address some obstacles to sexual health service and SRE provision in schools
Quasi-Moessbauer effect in two dimensions
Expressions for the absorption spectrum of a nucleus in a three- and a
two-dimensional crystal respectively are obtained analytically at zero and at
finite temperature respectively. It is found that for finite temperature in two
dimensions the Moessbauer effect vanishes but is replaced by what we call a
Quasi-Moessbauer effect. Possibilities to identify two-dimensional elastic
behavior are discussed.Comment: 18 pages, 5 figures, notation simplifie
Nonlinear Dielectric Microwave Losses in MgO Substrates
We have investigated the nonlinear surface impedance and two-tone
intermodulation distortion of nine epitaxial YBa2Cu3O7-d films on MgO
substrates, using stripline resonators, at frequencies f=2.3-11.2GHz and
temperatures T=1.7K-Tc. The power dissipation decreased by up to one order of
magnitude as the microwave electric field was increased to about 100V/m for
T<20 K, while the reactance Xs showed only a weak increase. The minimum of the
losses correlated with a plateau in the intermodulation signal. The same
features were observed for a Nb film on MgO. The anomalous response is due to
nonlinear dielectric losses in the substrate, which can be described by defect
dipole relaxation
The Controversies and Difficulties of Diagnosing Primary Ciliary Dyskinesia
We welcome the correspondence from Lavie and Amirav (1), highlighting the difficulties diagnosing primary ciliary dyskinesia (PCD) and the role of high-speed video analysis (HSVA). As members of the European Respiratory Society (ERS) PCD Diagnostic Task Force (2) and/or large PCD Centres, we agree that HSVA has an important role that is not recognized by the American Thoracic Society (ATS) PCD Diagnostic Guideline (3). This risks a large proportion of false-negative “missed” diagnoses and a sizable number of false-positive cases; we make additional important observations.</div
Number counts and clustering properties of bright Distant Red Galaxies in the UKIDSS Ultra Deep Survey Early Data Release
We describe the number counts and spatial distribution of 239 Distant Red
Galaxies (DRGs), selected from the Early Data Release of the UKIDSS Ultra Deep
Survey. The DRGs are identified by their very red infrared colours with
(J-K)AB>1.3, selected over 0.62 sq degree to a 90% completeness limit of
KAB~20.7. This is the first time a large sample of bright DRGs has been studied
within a contiguous area, and we provide the first measurements of their number
counts and clustering. The population shows strong angular clustering,
intermediate between those of K-selected field galaxies and
optical/infrared-selected Extremely Red Galaxies. Adopting the redshift
distributions determined from other recent studies, we infer a high correlation
length of r0~11 h-1 Mpc. Such strong clustering could imply that our galaxies
are hosted by very massive dark matter halos, consistent with the progenitors
of present-day L>L* elliptical galaxies.Comment: 5 pages, 4 figures, revised version accepted to MNRAS.
Higher-resolution figures available from the authors on reques
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