2,193 research outputs found
Mechanical dynamic load of the LHC arc cryo-magnets during the installation
About 1700 LHC main superconducting dipoles and quadrupoles will have to be transported and handled between the assembly, the magnet measurements and the storage that precedes the final installation in the LHC tunnel. To ensure the required mechanic and geometric integrity of the cryo-magnets, transport specifications and allowed acceleration loads were defined after detailed dynamic analysis. A large number of cryo-magnets are now arriving at CERN on a regular basis. The logistics for the handling and transport are monitored with tri-axial acceleration monitoring devices that are installed on each cryo-magnet. Measurements are made to commission new equipment like overhead cranes, tunnel transport and handling devices to guarantee that the defined acceleration limits are respected. The results from the acceleration monitoring that are stored in the same quality assurance system as the cryo-magnets allowed to give a first idea of the level of the mechanical dynamic load on each magnet throughout the logistics chain and were used to detect details such as out-of-specification accelerations that needed improvement
Impact of passive and active promotional strategies on patient acceptance of medication therapy management services
Objectives
To assess the impact of passive and active promotional strategies on patient acceptance of medication therapy management (MTM) services, and to identify reasons for patient acceptance or refusal.
Methods
Four promotional approaches were developed to offer MTM services to eligible patients, including letters and bag stuffers (“passive” approaches), and face-to-face offers and telephone calls (“active” approaches). Thirty pharmacies in a grocery store chain were randomized to one of the four approaches. Patient acceptance rates were compared among the four groups, and between active and passive approaches using hierarchical logistic regression techniques. Depending on their decision to accept or decline the service, patients were invited to take part in one of two brief telephone surveys.
Results
No significant differences were identified among the four promotional methods or between active and passive methods in the analyses. Patients’ most frequent reasons for accepting MTM services were potential cost savings, review of how the medications were working, the expert opinion of the pharmacist, and education about medications. Patients’ most frequent reasons for declining MTM services were that the participant already felt comfortable with their medications and felt their pharmacist provides these services on a regular basis.
Conclusion
No significant difference was found among any of the four groups or between active or passive approaches. Further research is warranted to identify strategies for improving patient engagement in MTM services
Bubble Growth as a Detonation
Bubble growth as a detonation is studied in the context of cosmological phase
transitions. It is proved that the so called Chapman-Jouguet hypothesis, which
restricts the types of detonations that can occur in spherically symmetric
chemical burning, does not hold in the case of phase transitions. Therefore a
much larger class of detonation solutions exists in phase transitions than in
chemical burning.Comment: 15 LaTeX-pages with 5 ps-figures appended at the end, preprint
HU-TFT-93-4
Interface Tension in Quenched QCD
We calculate the tension of the interface between the confined and
deconfined phases by the histogram method in SU(3) lattice gauge theory for
temporal extents of 4 and 6 using the recent high-statistics data by QCDPAX
collaboration. The results are and 0.0218(33) for
and 6, respectively. The ratio shows a scaling violation
similar to that already observed for the latent heat \latent. However, we
find that the physically interesting dimensionless combinations
(\sigma^{3}/\latent^2 T)^{1/2} and \sigma T/ \latent scale within the
statistical errors.Comment: 13 pages with 2 PostScript figures, LaTeX, CERN-TH.6798/93,
AZPH-TH/93-04, UTHEP-25
Does increased interdisciplinary contact among hard and social scientists help or hinder interdisciplinary research?
Scientists across disciplines must often work together to address pressing global issues facing our societies. For interdisciplinary projects to flourish, scientists must recognise the potential contribution of other disciplines in answering key research questions. Recent research suggested that social sciences may be appreciated less than hard sciences overall. Building on the extensive evidence of ingroup bias and ethnocentrism in intergroup relations, however, one could also expect scientists, especially those belonging to high status disciplines, to play down the contributions of other disciplines to important research questions. The focus of the present research was to investigate how hard and social scientists perceive one another and the impact of interdisciplinary collaborations on these perceptions. We surveyed 280 scientists at Wave 1 and with 129 of them followed up at Wave 2 to establish how ongoing interdisciplinary collaborations underpinned perceptions of other disciplines. Based on Wave 1 data, scientists who report having interdisciplinary experiences more frequently are also more likely to recognise the intellectual contribution of other disciplines and perceive more commonalities with them. However, in line with the intergroup bias literature, group membership in the more prestigious hard sciences is related to a stronger tendency to downplay the intellectual contribution of social science disciplines compared to other hard science disciplines. This bias was not present among social scientists who produced very similar evaluation of contribution of hard and social science disciplines. Finally, using both waves of the survey, the social network comparison of discipline pairs shows that asymmetries in the evaluation of other disciplines are only present among discipline pairs that do not have any experience of collaborating with one another. These results point to the need for policies that incentivise new collaborations between hard and social scientists and foster interdisciplinary contact
Beta reduction constraints
The constraint language for lambda structures (CLLS) can model lambda terms that are known only partially. In this paper, we introduce beta reduction constraints to describe beta reduction steps between partially known lambda terms. We show that beta reduction constraints can be expressed in an extension of CLLS by group parallelism. We then extend a known semi-decision procedure for CLLS to also deal with group parallelism and thus with beta-reduction constraints
The Baryon asymmetry in the Standard Model with a low cut-off
We study the generation of the baryon asymmetry in a variant of the standard
model, where the Higgs field is stabilized by a dimension-six interaction.
Analyzing the one-loop potential, we find a strong first order electroweak
phase transition for Higgs masses up to at least 170 GeV. Dimension-six
operators induce also new sources of CP violation. We compute the baryon
asymmetry in the WKB approximation. Novel source terms in the transport
equations enhance the generated baryon asymmetry. For a wide range of
parameters the model predicts a baryon asymmetry close to the observed value.Comment: 22 pages, latex, 6 figure
Electroweak Phase Transitions in left-right symmetric models
We study the finite-temperature effective potential of minimal left-right
symmetric models containing a bidoublet and two triplets in the scalar sector.
We perform a numerical analysis of the parameter space compatible with the
requirement that baryon asymmetry is not washed out by sphaleron processes
after the electroweak phase transition. We find that the spectrum of scalar
particles for these acceptable cases is consistent with present experimental
bounds.Comment: 20 pages, 5 figures (included), some comments added, typos corrected
and new references included. Final version to appear in PR
Towards a Nonequilibrium Quantum Field Theory Approach to Electroweak Baryogenesis
We propose a general method to compute -violating observables from
extensions of the standard model in the context of electroweak baryogenesis. It
is alternative to the one recently developed by Huet and Nelson and relies on a
nonequilibrium quantum field theory approach. The method is valid for all
shapes and sizes of the bubble wall expanding in the thermal bath during a
first-order electroweak phase transition. The quantum physics of -violation
and its suppression coming from the incoherent nature of thermal processes are
also made explicit.Comment: 19 pages, 1 figure available upon e-mail reques
On Bubble Growth and Droplet Decay in Cosmological Phase Transitions
We study spherically symmetric bubble growth and droplet decay in first order
cosmological phase transitions, using a numerical code including both the
complete hydrodynamics of the problem and a phenomenological model for the
microscopic entropy producing mechanism at the phase transition surface. The
small-scale effects of finite wall width and surface tension are thus
consistently incorporated. We verify the existence of the different
hydrodynamical growth modes proposed recently and investigate the problem of a
decaying quark droplet in the QCD phase transition. We find that the decaying
droplet leaves behind no rarefaction wave, so that any baryon number
inhomogeneity generated previously should survive the decay.Comment: 10 pages (revtex), 10 figures as uuencoded postscrip
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