95 research outputs found
Psychometric properties of the QoL-ME:A visual and personalized quality of life assessment app for people with severe mental health problems
Background: Quality of Life (QoL) assessment in people with severe mental health problems may benefit from improved personalization and accessibility. Therefore, an innovative, digital, visual, and personalized QoL assessment app for people with severe mental health problems was recently developed: the QoL-ME. The aim of this study was to evaluate the psychometric quality of the QoL-ME by assessing its reliability, validity, and responsiveness. Methods: To examine the reliability of the QoL-ME, the internal consistency of its subscales was assessed using Cronbach's Alpha. Correlations between the QoL-ME and the MANSA were computed to appraise the construct validity of the QoL-ME. Internal responsiveness was evaluated using the standardized response mean and external responsiveness was investigated using hierarchical regression. Results: Cronbach's Alpha's of the subscales of the QoL-ME ranged between 0.5 and 0.84. In accordance with expectations, the language-based core version of the QoL-ME correlated strongly (r = between 0.55 and 0.76) with the MANSA, whilst the picture-based additional modules of the QoL-ME correlated moderately (r = 0.3) with the MANSA. The standardized response mean was 0.23 and the regression model revealed a coefficient ÎČ of â0.01. Conclusions: The QoL-ME has adequate psychometric properties. In comparison with similar pictorial instruments, both the QoL-ME's reliability and validity can be considered as sufficient. The results indicate that the responsiveness of the QoL-ME is insufficient. Additional research is needed to evaluate and potentially modify the instrument to improve its responsiveness
Order corrections to the conformal anomaly of the (2,0) theory in six dimensions
Using Supergravity on we calculate the bulk one-loop
contribution to the conformal anomaly of the (2,0) theory describing
coincident M5 branes. When this is added to the tree-level result, and an
additional subleading order contribution calculated by Tseytlin, it gives an
expression for the anomaly that interpolates correctly between the large
theory and the free (2,0) tensor theory corresponding to N=1. Thus we can argue
that we have identified the exact -dependence of the anomaly, which may have
a simple protected form valid away from the large limit.Comment: LaTeX, 9 page
I need to know:Using the CeHRes roadmap to develop a treatment feedback tool for youngsters with mental health problems
Patient-Reported Outcome Measures (PROMs) are often used to monitor treatment outcomes in youth mental health care. Unfortunately, youngsters are rarely informed about the results of their PROMs or, when they are, it is in an insufficient manner. Therefore, a web application was developedâtogether with youngstersâaimed at giving them feedback about their PROMs. The aim of this study is to describe the development process of the application. An expert panel consisting of youngsters, web designers and researchers, as well as a representative from a client organisation, developed the e-health application INK (short for âI Need to Knowâ) in an iterative process based on the Centre for eHealth Research roadmap (CeHRes roadmap). Youngsters prefer, among other aspects, a simple, easy-to-use e-health application with a colourful appearance and want to be able to compare their results across different time points and informants. The INK tool provides youngsters with insight into their PROM results. Based on the youngstersâ preferences, INK users can choose which feedback information is visible. INK facilitates youngstersâ active participation in their treatment as well as shared decision-making with their professional caregivers
Effective Superstrings
We generalize the method of quantizing effective strings proposed by
Polchinski and Strominger to superstrings. The Ramond-Neveu-Schwarz string is
different from the Green-Schwarz string in non-critical dimensions. Both are
anomaly-free and Poincare invariant. Some implications of the results are
discussed. The formal analogy with 4D (super)gravity is pointed out.Comment: 17 pages (including the title page
The WZNW Model at Two Loops
We study perturbatively the (conformal) WZNW model. At one loop we compute
one-particle irreducible two- and three-point current correlation functions,
both in the conventional version and in the classically equivalent, chiral,
nonlocal, induced version of the model. At two loops we compute the two-point
function and find that it vanishes (modulo infrared-induced logarithms). We use
dimensional regularization and the operation for removing infrared
divergences. The outcome of the calculations is insensitive to the treatment of
the \varepsilon^{\m\n} tensor as a two-dimensional or -dimensional object.
Our results indicate that the one-particle irreducible current correlation
functions constitute an effective action equal to the original WZNW action with
the familiar level shift, .Comment: 40 pages, Latex, (4 postscript figures at end of file, to be split
off into files called diag1.ps,...,diag4.ps),THU-93/1
Horizons Inside Classical Lumps
Hopefully tex-able version.Comment: 13 pages, UMHEP-37
Non-Abelian Magnetized Blackholes and Unstable Attractors
Fluctuations of non-Abelian gauge fields in a background magnetic flux
contain tachyonic modes and hence the background is unstable. We extend these
results to the cases where the background flux is coupled to Einstein gravity
and show that the corresponding spherically symmetric geometries, which in the
absence of a cosmological constant are of the form of Reissner-Nordstrom
blackholes or the AdS_2xS^2, are also unstable. We discuss the relevance of
these instabilities to several places in string theory including various string
compactifications and the attractor mechanism. Our results for the latter imply
that the attractor mechanism shown to work for the extremal Abelian charged
blackholes, cannot be applied in a straightforward way to the extremal
non-Abelian colored blackholes.Comment: 23 pages, 3 .eps figures; v2: Stability of minimal charge blackhole
emphasized, Refs adde
Nonlinear Dynamics of 3D Massive Gravity
We explore the nonlinear classical dynamics of the three-dimensional theory
of "New Massive Gravity" proposed by Bergshoeff, Hohm and Townsend. We find
that the theory passes remarkably highly nontrivial consistency checks at the
nonlinear level. In particular, we show that: (1) In the decoupling limit of
the theory, the interactions of the helicity-0 mode are described by a single
cubic term -- the so-called cubic Galileon -- previously found in the context
of the DGP model and in certain 4D massive gravities. (2) The conformal mode of
the metric coincides with the helicity-0 mode in the decoupling limit. Away
from this limit the nonlinear dynamics of the former is described by a certain
generalization of Galileon interactions, which like the Galileons themselves
have a well-posed Cauchy problem. (3) We give a non-perturbative argument based
on the presence of additional symmetries that the full theory does not lead to
any extra degrees of freedom, suggesting that a 3D analog of the 4D
Boulware-Deser ghost is not present in this theory. Last but not least, we
generalize "New Massive Gravity" and construct a class of 3D cubic order
massive models that retain the above properties.Comment: 21 page
On the stability of renormalizable expansions in three-dimensional gravity
Preliminary investigations are made for the stability of the expansion
in three-dimensional gravity coupled to various matter fields, which are
power-counting renormalizable. For unitary matters, a tachyonic pole appears in
the spin-2 part of the leading graviton propagator, which implies the unstable
flat space-time, unless the higher-derivative terms are introduced. As another
possibility to avoid this spin-2 tachyon, we propose Einstein gravity coupled
to non-unitary matters. It turns out that a tachyon appears in the spin-0 or -1
part for any linear gauges in this case, but it can be removed if non-minimally
coupled scalars are included. We suggest an interesting model which may be
stable and possess an ultraviolet fixed point.Comment: 32 pages. (A further discussion to avoid tachyons is included. To be
Published in Physical Review D.
Invariant Correlations in Simplicial Gravity
Some first results are presented regarding the behavior of invariant
correlations in simplicial gravity, with an action containing both a bare
cosmological term and a lattice higher derivative term. The determination of
invariant correlations as a function of geodesic distance by numerical methods
is a difficult task, since the geodesic distance between any two points is a
function of the fluctuating background geometry, and correlation effects become
rather small for large distances. Still, a strikingly different behavior is
found for the volume and curvature correlation functions. While the first one
is found to be negative definite at large geodesic distances, the second one is
always positive for large distances. For both correlations the results are
consistent in the smooth phase with an exponential decay, turning into a power
law close to the critical point at . Such a behavior is not completely
unexpected, if the model is to reproduce the classical Einstein theory at
distances much larger than the ultraviolet cutoff scale.Comment: 27 pages, conforms to published versio
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