1,591 research outputs found
First Communion and Confirmation
The decision concerning the right age for First Communion is the prerogative of the pastor in the setting of his congregation. Every baptized child of God should receive the sacramental grace imparted in Holy Communion
A steerable UV laser system for the calibration of liquid argon time projection chambers
A number of liquid argon time projection chambers (LAr TPC's) are being build
or are proposed for neutrino experiments on long- and short baseline beams. For
these detectors a distortion in the drift field due to geometrical or physics
reasons can affect the reconstruction of the events. Depending on the TPC
geometry and electric drift field intensity this distortion could be of the
same magnitude as the drift field itself. Recently, we presented a method to
calibrate the drift field and correct for these possible distortions. While
straight cosmic ray muon tracks could be used for calibration, multiple coulomb
scattering and momentum uncertainties allow only a limited resolution. A UV
laser instead can create straight ionization tracks in liquid argon, and allows
one to map the drift field along different paths in the TPC inner volume. Here
we present a UV laser feed-through design with a steerable UV mirror immersed
in liquid argon that can point the laser beam at many locations through the
TPC. The straight ionization paths are sensitive to drift field distortions, a
fit of these distortion to the linear optical path allows to extract the drift
field, by using these laser tracks along the whole TPC volume one can obtain a
3D drift field map. The UV laser feed-through assembly is a prototype of the
system that will be used for the MicroBooNE experiment at the Fermi National
Accelerator Laboratory (FNAL)
Measurement of the drift field in the ARGONTUBE LAr TPC with 266~nm pulsed laser beams
ARGONTUBE is a liquid argon time projection chamber (LAr TPC) with a drift
field generated in-situ by a Greinacher voltage multiplier circuit. We present
results on the measurement of the drift-field distribution inside ARGONTUBE
using straight ionization tracks generated by an intense UV laser beam. Our
analysis is based on a simplified model of the charging of a multi-stage
Greinacher circuit to describe the voltages on the field cage rings
Experimental study of electric breakdowns in liquid argon at centimeter scale
In this paper we present results on measurements of the dielectric strength
of liquid argon near its boiling point and cathode-anode distances in the range
of 0.1 mm to 40 mm with spherical cathode and plane anode. We show that at such
distances the applied electric field at which breakdowns occur is as low as 40
kV/cm. Flash-overs across the ribbed dielectric of the high voltage
feed-through are observed for a length of 300 mm starting from a voltage of 55
kV. These results contribute to set reference for the breakdown-free design of
ionization detectors, such as Liquid Argon Time Projection Chambers (LAr TPC)
A study based on claims data from a German health insurance fund
Background The objective of this study is to investigate the effect of age on
care dependency risk 1 year after stroke. Two research questions are
addressed: (1) How strong is the association between age and care dependency
risk 1 year after stroke and (2) can this association be explained by burden
of disease? Methods The study is based on claims data from a German statutory
health insurance fund. The study population was drawn from all continuously
insured members with principal diagnoses of ischaemic stroke, hemorrhagic
stroke, or transient ischaemic attack in 2007 who survived for 1 year after
stroke and who were not dependent on care before their first stroke (n =
2864). Data were collected over a 1-year period. People are considered to be
dependent on care if they, due to a physical, mental or psychological illness
or disability, require substantial assistance in carrying out activities of
daily living for a period of at least 6 months. Burden of disease was assessed
by stroke subtype, history of stroke, comorbidities as well as geriatric
multimorbidity. Regression models were used for data analysis. Results 21.6 %
of patients became care dependent during the observation period. Post-stroke
care dependency risk was significantly associated with age. Relative to the
reference group (0–65 years), the odds ratio of care dependency was 11.30 (95
% CI: 7.82–16.34) in patients aged 86+ years and 5.10 (95 % CI: 3.88–6.71) in
patients aged 76–85 years. These associations were not explained by burden of
disease. On the contrary, age effects became stronger when burden of disease
was included in the regression model (by between 1.1 and 28 %). Conclusions
Our results show that age has an effect on care dependency risk that cannot be
explained by burden of disease. Thus, there must be other underlying age-
dependent factors that account for the remaining age effects (e.g., social
conditions). Further studies are needed to explore the causes of the strong
age effects observed
Belisar : tragische Oper in drei Akten / nach dem gleichnamigen Trauerspiel von Eduard von Schenk bearb. von Salvatore Cammarano. Musik von G. Donizetti. Dt. Übers. von J. Hähnel. Neu rev. Text der Gesänge mit Angabe des Inhalts der Oper und einer Einf. in dieselbe von Hermann Mendel
The Use of Virtual Calibrations to Facilitate Understanding of Factor Analysis
Tutorial published on: http://www.chemometrics.se/File/VirtualCalibrations.pd
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