319 research outputs found
Deployable truss structure advanced technology
The 5-meter technology antenna program demonstrated the overall feasibility of integrating a mesh reflector surface with a deployable truss structure to achieve a precision surface contour compatible with future, high-performance antenna requirements. Specifically, the program demonstrated: the feasibility of fabricating a precision, edge-mounted, deployable, tetrahedral truss structure; the feasibility of adjusting a truss-supported mesh reflector contour to a surface error less than 10 mils rms; and good RF test performance, which correlated well with analytical predictions. Further analysis and testing (including flight testing) programs are needed to fully verify all the technology issues, including structural dynamics, thermodynamics, control, and on-orbit RF performance, which are associated with large, deployable, truss antenna structures
Data management study, volume 5. Appendix J - Contractor data package procurement and contracting /PC/ Final report
Contractor data package for administration of procurement and contracting of Voyager spacecraft system
Reduced nonlinear description of Farley-Buneman instability
In the study on nonlinear wave-wave processes in an ionosphere and a
magnetosphere usually the main attention is paid to investigation of plasma
turbulence at well developed stage, when the wide spectrum of plasma wave is
present. On the other side, it is well known that even if the number of
cooperating waves remains small due to a competition of processes of their
instability and attenuation, the turbulence appears in the result of their
stochastic behavior. The regimes of nonlinear dynamics of low frequency waves
excited due to Farley-Buneman instability in weakly ionized and inhomogeneous
ionospheric plasma in the presence of electric current perpendicular to ambient
magnetic field are considered. The problem is essentially three dimensional and
difficult for full numerical simulation, but the strong collisional damping of
waves allow to assume that in this case a perturbed state of plasma can be
described as finite set of interacting waves, some of which are unstable and
other strongly damping. The proposed nonlinear model allow to make full study
of nonlinear stabilization, conditions of stochasticity and to consider the
different regimes and properties of few mode plasma turbulence.Comment: The extended version of work, published in AIP Conf. Proc. 993, 113
(2008
Traumatization and mental distress in long-term prisoners in Europe
This article investigates the prevalence of traumatization and mental distress
in a sample of 1055 male European long-term prisoners as part of a wider study
of the living conditions of prisoners serving sentences of at least five years
in Belgium, Croatia, Denmark, England, Finland, France, Germany, Lithuania,
Poland, Spain and Sweden. Data were collected in a written survey using the
Posttraumatic Diagnostic Scale (PDS), the Brief Symptom Inventory (BSI) as
well as questions on attempted suicide and auto-aggressive behaviour.
Participants experienced a mean of three traumatic events, with 14 per cent
developing a Posttraumatic Stress Disorder (PTSD) subsequently. In each
national sample, more than 50 per cent of the participants were in need of
treatment because of psychological symptoms and nearly one-third had attempted
suicide
Modeling and experimental characterization of stepped and v-shaped {311} defects in silicon
Producción CientíficaWe propose an atomistic model to describe extended {311} defects in silicon. It is based on the combination of interstitial and bond defect chains. The model is able to accurately reproduce not only planar {311} defects but also defect structures that show steps, bends, or both. We use molecular dynamics techniques to show that these interstitial and bond defect chains spontaneously transform into extended {311} defects. Simulations are validated by comparing with precise experimental measurements on actual {311} defects. The excellent agreement between the simulated and experimentally derived structures, regarding individual atomic positions and shape of the distinct structural {311} defect units, provides strong evidence for the robustness of the proposed model.Ministerio de Ciencia e Innovación (Proyect TEC2011-27701
Ab initio single-neutron spectroscopic overlaps in lithium isotopes
We calculate single-neutron spectroscopic overlaps for lithium isotopes in
the framework of the \textit{ab initio} symmetry-adapted no-core shell model.
We report the associated neutron-nucleus asymptotic normalization coefficients
(ANCs) and spectroscopic factors (SFs) that are important ingredients in many
reaction cross section calculations. While spectroscopic factors have been
traditionally extracted from experimental cross sections, their sensitivity on
the type of reactions, energy, and the underlying models point to the need for
determining SF from first-principle structure considerations. As illustrative
examples, we present Li+n, Li+n, and Li+n, and we show that the
results are in a good agreement with those of other \textit{ab initio} methods,
where available, including the quantum Monte Carlo approach. We compare ANCs
and SFs to available experimentally deduced values, with a view toward
expanding this study to heavier nuclei and to extracting inter-cluster
effective interactions for input into analyses of existing and future
experimental data.Comment: 10 pages, 8 figure
Did female prisoners with mental disorders receive psychiatric treatment before imprisonment?
© 2015 Mundt et al.; licensee BioMed Central. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain
Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article,
unless otherwise stated.BackgroundThroughout the world, high prevalence rates of mental disorders have been found in prison populations, especially in females. It has been suggested that these populations do not access psychiatric treatment. The aim of this study was to establish rates of psychiatric in- and outpatient treatments prior to imprisonment in female prisoners and to explore reasons for discontinuation of such treatments.Methods150 consecutively admitted female prisoners were interviewed in Berlin, Germany. Socio-demographic characteristics, mental disorders, and previous psychiatric in- and outpatient treatments were assessed by trained researchers. Open questions were used to explore reasons for ending previous psychiatric treatment.ResultsA vast majority of 99 prisoners (66%; 95% CI: 58¿73) of the total sample reported that they had previously been in psychiatric treatment, 80 (53%; 95 CI: 45¿61) in inpatient treatment, 62 (41%; 95 CI: 34¿49) in outpatient treatment and 42 (29%; 21¿39) in both in- and outpatient treatments. All prisoners with psychosis and 72% of the ones with any lifetime mental health disorder had been in previous treatment. The number of inpatient treatments and imprisonments were positively correlated (rho¿=¿0.27; p¿<¿0.01). Inpatient treatment was described as successfully completed by 56% (N¿=¿41) of those having given reasons for ending such treatment, whilst various reasons were reported for prematurely ending outpatient treatments.ConclusionThe data do not support the notion of a general `mental health treatment gap¿ in female prisoners. Although inpatient care is often successfully completed, repeated inpatient treatments are not linked with fewer imprisonments. Improved transition from inpatient to outpatient treatment and services that engage female prisoners to sustained outpatient treatments are needed
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