34,536 research outputs found
Feed-through has polyterminal feature
Feed-through connector with individual solder pots in the polyterminal side provides good connections with small amounts of solder and permits visual inspection of bonds. Polyterminal also provides a friction mechanical bond to position conductors prior to soldering
Examining professionals' and parents' views of using transanal irrigation with children: Understanding their experiences to develop a shared health resource for education and practise
Irrigation as a bowel management approach has been reportedly used with children for more than 20 years. Parents managing their child's chronic bowel problem have previously been shown to have increased emotional stress. The aim of this study was to explore professionals' (n = 24) understanding and parents' (n = 18) experiences of using transanal irrigation with children at home as a mid to longer term bowel management approach. This study was underpinned by action research methodology and used mixed methods determined by an action research group of parents, professionals, researchers, a voluntary sector worker, commercial representative and independent observer. Data informed the study outcome which was the development and evaluation of a shared health resource to support professionals in their holistic approach when prescribing transanal irrigation and guide parents in the areas of education, management, problem solving, support and goal setting. The resource includes constructed case studies from parents of their experiences to inform choice and decision-making between parents and professionals. The shared health resource provides an approach to initiating and evaluating transanal irrigation and is available in a paper format from key Internet sites across hospital, community and voluntary services
Advanced post-saturn earth launch vehicle study executive summary report
Advanced post-Saturn earth launch vehicle design and chemonuclear propulsion system performanc
Stream-orbit misalignment I: The dangers of orbit-fitting
Tidal streams don't, in general, delineate orbits. A stream-orbit
misalignment is expected to lead to biases when using orbit-fitting to
constrain models for the Galactic potential. In this first of two papers we
discuss the expected magnitude of the misalignment and the resulting dangers of
using orbit-fitting algorithms to constrain the potential. We summarize data
for known streams which should prove useful for constraining the Galactic
potential, and compute their actions in a realistic Galactic potential. We go
on to discuss the formation of tidal streams in angle-action space, and explain
why, in general, streams do not delineate orbits. The magnitude of the
stream-orbit misalignment is quantified for a logarithmic potential and a
multi-component Galactic potential. Specifically, we focus on the expected
misalignment for the known streams. By introducing a two-parameter family of
realistic Galactic potentials we demonstrate that assuming these streams
delineate orbits can lead to order one errors in the halo flattening and
halo-to-disc force ratio at the Sun. We present a discussion of the dependence
of these results on the progenitor mass, and demonstrate that the misalignment
is mass-independent for the range of masses of observed streams. Hence,
orbit-fitting does not yield better constraints on the potential if one uses
narrower, lower-mass streams.Comment: 13 pages, 7 figures, accepted for publication in MNRA
Stream-orbit misalignment II: A new algorithm to constrain the Galactic potential
In the first of these two papers we demonstrated that assuming streams
delineate orbits can lead to order one errors in potential parameters for
realistic Galactic potentials. Motivated by the need for an improvement on
orbit-fitting, we now present an algorithm for constraining the Galactic
potential using tidal streams without assuming that streams delineate orbits.
This approach is independent of the progenitor mass so is valid for all
observed tidal streams. The method makes heavy use of angle-action variables
and seeks the potential which recovers the expected correlations in angle
space. We demonstrate that the method can correctly recover the parameters of a
simple two-parameter logarithmic potential by analysing an N-body simulation of
a stream. We investigate the magnitude of the errors in observational data for
which the method can still recover the correct potential and compare this to
current and future errors in data. The errors in the observables of individual
stars for current and near future data are shown to be too large for the direct
use of this method, but when the data are averaged in bins on the sky, the
resulting averaged data are accurate enough to constrain correctly the
potential parameters for achievable observational errors. From pseudo-data with
errors comparable to those that will be furnished in the era of Gaia (20 per
cent distance errors, 1.2 mas/yr proper motion errors, and 10 km/s
line-of-sight velocity errors) we recover the circular velocity, V_c=220 km/s,
and the flattening of the potential, q=0.9, to be V_c=223+/-10km/s and
q=0.91+/-0.09.Comment: 11 pages, 5 figures, accepted for publication in MNRA
Passive Mode-Locking of Monolithic InGaAs/AlGaAs Double Quantum Well Lasers at 42GHz Repetition Rate
Pulse trains with a 42GHz repetition rate were generated by monolithic InGaAs/AlGaAs double quantum well lasers at a wavelength of 985 [angstroms]. The cavity was electrically divided into three regions, one providing gain and the other two providing saturable absorption. The optical modulation has a depth greater than 98% and full-width at half-maximum under 6ps, and bias conditions for sustained mode-locking are determined
On the shell equations in complex form
Formulation of general equations of linear thin shell theory in terms of complex combinations of dependent variable
- …