433 research outputs found
The perception of food products in adolescents, lay adults, and experts: A psychometric approach
Crackling Noise, Power Spectra and Disorder Induced Critical Scaling
Crackling noise is observed in many disordered non-equilibrium systems in
response to slowly changing external conditions. Examples range from Barkhausen
noise in magnets to acoustic emission in martensites to earthquakes. Using the
non-equilibrium random field Ising model, we derive universal scaling
predictions for the dependence of the associated power spectra on the disorder
and field sweep rate, near an underlying disorder-induced non-equilibrium
critical point. Our theory applies to certain systems in which the crackling
noise results from avalanche-like response to a (slowly) increasing external
driving force, and is characterized by a broad power law scaling regime of the
power spectra. We compute the critical exponents and discuss the relevance of
the results to experiments.Comment: 27 Latex Pages, 14 eps figure
Line and boundary tensions at the wetting transition: Two fluid phases on a substrate
We develop and analyze a meanâfield model free energy that describes two fluid phases on a substrate in order to calculate the (numerically) exact line and boundary tensions, on approach to the firstâorder wetting transition. A theory based on the van der Waals theory of gasâliquid interfaces is used. We implement a multigrid algorithm to determine the twoâdimensional spatial variation of the density across the threeâphase and boundary regions, and hence, the line and boundary tensions. As the wetting transition is approached, the tensions approach the same, finite, positive limit with diverging slopes. We compare our results with those of recent related work.FWN â Publicaties zonder aanstelling Universiteit Leide
Psychological and Hierarchical Closeness as Opposing Factors in Whistleblowing: A Meta-Analysis
This is the final version. Available on open access from Springer via the DOI in this recordData Availability:
The data and code that support the findings of this study are available on the Open Science Framework (OSF) at: https://osf.io/f7aj4/?view_only=11eb7c401e2b4fcc9d0e15f8e1b4de42.Although employees are an important means of detecting and preventing misconducts through whistleblowing, many witnesses choose to remain silent. One reason to remain silent is the discomfort of reporting a colleague. Intuitively, employees should be less likely to report a close or trusted colleague, but a previous review suggests that the opposite may actually be true. However, later studies have shown mixed effects of social closeness on whistleblowing. To gain a better understanding of how social closeness affects whistleblowing, we meta-analyzed 22 experimental studies on intentions to blow the whistle. Overall, the studies show no effect of social closeness on whistleblowing intentions, dâ=ââââ0.21, pâ=â.05. However, when separating the studies by type of closeness, we find that psychological closeness has a negative effect, dâ=ââââ0.46, pâ<â.001, while hierarchical closeness has a positive effect, dâ=â.34, pâ<â.001 on whistleblowing intentions. This means that employees are most likely to report misconduct if the perpetrator is at the same hierarchical level in the organization and not a close or trusted friend. Since close psychological bonds are more likely to develop between employees at the same hierarchical level, the two types of closeness may counteract each other. This dilemma could be part of the explanation why so many witnesses choose to remain silent
Self-organized criticality in the hysteresis of the Sherrington - Kirkpatrick model
We study hysteretic phenomena in random ferromagnets. We argue that the angle
dependent magnetostatic (dipolar) terms introduce frustration and long range
interactions in these systems. This makes it plausible that the Sherrington -
Kirkpatrick model may be able to capture some of the relevant physics of these
systems. We use scaling arguments, replica calculations and large scale
numerical simulations to characterize the hysteresis of the zero temperature SK
model. By constructing the distribution functions of the avalanche sizes,
magnetization jumps and local fields, we conclude that the system exhibits
self-organized criticality everywhere on the hysteresis loop.Comment: 4 pages, 4 eps figure
Boundary Tension - from Wetting Transition to Prewetting Critical Point
FWN â Publicaties zonder aanstelling Universiteit Leide
Follow-up of blood-pressure lowering and glucose control in type 2 diabetes.
BACKGROUND
In the Action in Diabetes and Vascular Disease: Preterax and Diamicron Modified Release Controlled Evaluation (ADVANCE) factorial trial, the combination of perindopril and indapamide reduced mortality among patients with type 2 diabetes, but intensive glucose control, targeting a glycated hemoglobin level of less than 6.5%, did not. We now report results of the 6-year post-trial follow-up.
METHODS
We invited surviving participants, who had previously been assigned to perindoprilâindapamide or placebo and to intensive or standard glucose control (with the glucose-control comparison extending for an additional 6 months), to participate in a post-trial follow-up evaluation. The primary end points were death from any cause and major macrovascular events.
RESULTS
The baseline characteristics were similar among the 11,140 patients who originally underwent randomization and the 8494 patients who participated in the post-trial follow-up for a median of 5.9 years (blood-pressureâlowering comparison) or 5.4 years (glucose-control comparison). Between-group differences in blood pressure and glycated hemoglobin levels during the trial were no longer evident by the first post-trial visit. The reductions in the risk of death from any cause and of death from cardiovascular causes that had been observed in the group receiving active blood-pressureâlowering treatment during the trial were attenuated but significant at the end of the post-trial follow-up; the hazard ratios were 0.91 (95% confidence interval [CI], 0.84 to 0.99; P=0.03) and 0.88 (95% CI, 0.77 to 0.99; P=0.04), respectively. No differences were observed during follow-up in the risk of death from any cause or major macrovascular events between the intensive-glucose-control group and the standard-glucose-control group; the hazard ratios were 1.00 (95% CI, 0.92 to 1.08) and 1.00 (95% CI, 0.92 to 1.08), respectively.
CONCLUSIONS
The benefits with respect to mortality that had been observed among patients originally assigned to blood-pressureâlowering therapy were attenuated but still evident at the end of follow-up. There was no evidence that intensive glucose control during the trial led to long-term benefits with respect to mortality or macrovascular events
TREATMENT EFFECT OF CANAGLIFLOZIN FOR PATIENTS ON THERAPY FOR HEART FAILURE: POOLED ANALYSIS OF THE CANVAS PROGRAM AND CREDENCE TRIAL
Rayleigh loops in the random-field Ising model on the Bethe lattice
We analyze the demagnetization properties of the random-field Ising model on
the Bethe lattice focusing on the beahvior near the disorder induced phase
transition. We derive an exact recursion relation for the magnetization and
integrate it numerically. Our analysis shows that demagnetization is possible
only in the continous high disorder phase, where at low field the loops are
described by the Rayleigh law. In the low disorder phase, the saturation loop
displays a discontinuity which is reflected by a non vanishing magnetization
m_\infty after a series of nested loops. In this case, at low fields the loops
are not symmetric and the Rayleigh law does not hold.Comment: 8pages, 6 figure
High sensitivity cardiac troponin T and N-terminal pro-BNP predict cardiovascular events and death in patients with type 2 diabetes mellitus
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