Giant Colloidal Diffusivity on Corrugated Optical Vortices

A single colloidal sphere circulating around a periodically modulated optical vortex trap can enter a dynamical state in which it intermittently alternates between freely running around the ring-like optical vortex and becoming trapped in local potential energy minima. Velocity fluctuations in this randomly switching state still are characterized by a linear Einstein-like diffusion law, but with an effective diffusion coefficient that is enhanced by more than two orders of magnitude.Comment: 4 pages, 4 figure

Colloidal hydrodynamic coupling in concentric optical vortices

Optical vortex traps created from helical modes of light can drive fluid-borne colloidal particles in circular trajectories. Concentric circulating rings of particles formed by coaxial optical vortices form a microscopic Couette cell, in which the amount of hydrodynamic drag experienced by the spheres depends on the relative sense of the rings' circulation. Tracking the particles' motions makes possible measurements of the hydrodynamic coupling between the circular particle trains and addresses recently proposed hydrodynamic instabilities for collective colloidal motions on optical vortices.Comment: 7 pages, 2 figures, submitted to Europhysics Letter

A novel research definition of bladder health in women and girls: Implications for research and public health promotion

BACKGROUND:Bladder health in women and girls is poorly understood, in part, due to absence of a definition for clinical or research purposes. This article describes the process used by a National Institutes of Health funded transdisciplinary research team (The Prevention of Lower Urinary Tract Symptoms [PLUS] Consortium) to develop a definition of bladder health. METHODS:The PLUS Consortium identified currently accepted lower urinary tract symptoms (LUTS) and outlined elements of storage and emptying functions of the bladder. Consistent with the World Health Organization's definition of health, PLUS concluded that absence of LUTS was insufficient and emphasizes the bladder's ability to adapt to short-term physical, psychosocial, and environmental challenges for the final definition. Definitions for subjective experiences and objective measures of bladder dysfunction and health were drafted. An additional bioregulatory function to protect against infection, neoplasia, chemical, or biologic threats was proposed. RESULTS:PLUS proposes that bladder health be defined as: "A complete state of physical, mental, and social well-being related to bladder function and not merely the absence of LUTS. Healthy bladder function permits daily activities, adapts to short-term physical or environmental stressors, and allows optimal well-being (e.g., travel, exercise, social, occupational, or other activities)." Definitions for each element of bladder function are reported with suggested subjective and objective measures. CONCLUSIONS:PLUS used a comprehensive transdisciplinary process to develop a bladder health definition. This will inform instrument development for evaluation of bladder health promotion and prevention of LUTS in research and public health initiatives

Entanglement by linear SU(2) transformations: generation and evolution of quantum vortex states

We consider the evolution of a two-mode system of bosons under the action of a Hamiltonian that generates linear SU(2) transformations. The Hamiltonian is generic in that it represents a host of entanglement mechanisms, which can thus be treated in a unified way. We start by solving the quantum dynamics analytically when the system is initially in a Fock state. We show how the two modes get entangled by evolution to produce a coherent superposition of vortex states in general, and a single vortex state under certain conditions. The degree of entanglement between the modes is measured by finding the explicit analytical dependence of the Von Neumann entropy on the system parameters. The reduced state of each mode is analyzed by means of its correlation function and spatial coherence function. Remarkably, our analysis is shown to be equally as valid for a variety of initial states that can be prepared from a two-mode Fock state via a unitary transformation and for which the results can be obtained by mere inspection of the corresponding results for an initial Fock state. As an example, we consider a quantum vortex as the initial state and also find conditions for its revival and charge conjugation. While studying the evolution of the initial vortex state, we have encountered and explained an interesting situation in which the entropy of the system does not evolve whereas its wave function does. Although the modal concept has been used throughout the paper, it is important to note that the theory is equally applicable for a two-particle system in which each particle is represented by its bosonic creation and annihilation operators.Comment: 6 figure

Polarisation Patterns and Vectorial Defects in Type II Optical Parametric Oscillators

Previous studies of lasers and nonlinear resonators have revealed that the polarisation degree of freedom allows for the formation of polarisation patterns and novel localized structures, such as vectorial defects. Type II optical parametric oscillators are characterised by the fact that the down-converted beams are emitted in orthogonal polarisations. In this paper we show the results of the study of pattern and defect formation and dynamics in a Type II degenerate optical parametric oscillator for which the pump field is not resonated in the cavity. We find that traveling waves are the predominant solutions and that the defects are vectorial dislocations which appear at the boundaries of the regions where traveling waves of different phase or wave-vector orientation are formed. A dislocation is defined by two topological charges, one associated with the phase and another with the wave-vector orientation. We also show how to stabilize a single defect in a realistic experimental situation. The effects of phase mismatch of nonlinear interaction are finally considered.Comment: 38 pages, including 15 figures, LATeX. Related material, including movies, can be obtained from http://www.imedea.uib.es/Nonlinear/research_topics/OPO

The cancer's Margins project: access to knowledge and Its mobilization by LGBQ/T cancer patients

Sexual and/or gender minority populations (LGBQ/T) have particular cancer risks, lower involvement in cancer screening, and experience barriers in communication with healthcare providers. All of these factors increase the probability of health decisions linked with poor outcomes that include higher levels of cancer mortality. Persistent discrimination against, and stigmatization of, LGBQ/T people is reflected in sparse medical curriculum addressing LGBQ/T communities. Marginalization makes LGBQ/T persons particularly reliant on knowledge derived from online networks and mainstream media sources. In what is likely the first nationally-funded and nation-wide study of LGBQ/T experiences of cancer, the Cancer's Margins project (www.lgbtcancer.ca) conducted face-to-face interviews with 81 sexual and/or gender minority patients diagnosed and treated for breast and/or gynecological cancer in five Canadian provinces and the San Francisco Bay area (US). With specific attention to knowledge access, sharing, and mobilization, our objective was to document and analyze complex intersectional relationships between marginalization, gender and sexuality, and cancer health decision-making and care experiences. Findings indicate that cancer care knowledge in online environments is shaped by cisnormative and heteronormative narratives. Cancer knowledge and support environments need, by contrast, to be designed by taking into account intersectionally diverse models of minority identities and communities

Mechanisms and outcomes of a very low intensity intervention to improve parental acknowledgement and understanding of childhood overweight/obesity, embedded in the National Child Measurement Programme: A sub-study within a large cluster Randomized Controlled Trial (MapMe2)

\ua9 2025 The Author(s). British Journal of Health Psychology published by John Wiley & Sons Ltd on behalf of British Psychological Society. OBJECTIVES: Parental underdetection of child underweight and overweight/obesity may negatively affect children\u27s longer-term health. We examined psychological/behavioural mechanisms of a very low-intensity intervention to improve acknowledgement and understanding of child weight after feedback from a school-based weight monitoring programme. DESIGN: This sub-study was nested within a larger 3-arm cluster-RCT (1:1:1; N = 57,300). Parents in all groups received written postal feedback on their child\u27s weight classification. Intervention participants received an enhanced feedback letter with computer-generated photorealistic images depicting children of different weight classifications, and access to a website about supporting healthy weight, once (intervention one) or twice (intervention two; repeated 6 months after first \u27dose\u27). METHODS: A quantitative process and outcome evaluation using baseline and 12-month BMI z-scores of an opt-in sub-sample of 502 children aged 4-5 and 10-11. Children completed dietary reports, used accelerometers (MVPA), and self-reported self-esteem; 10-11-year-olds also self-reported quality of life and dietary restraint. Parents reported perceptions of child\u27s weight classification, and their intentions, self-efficacy, action planning and coping planning for child physical activity, dietary intake; parents of 4-5-year-olds reported their child\u27s quality of life. RESULTS: Neither intervention differentially improved parental acknowledgement or understanding of weight classification at follow-up, although parents in all groups reported better acknowledgement after receiving feedback. The interventions did not affect behavioural/psychological determinants, weight outcomes, children\u27s self-esteem, dietary restraint or quality of life. CONCLUSIONS: The interventions neither improved parental acknowledgement of child weight, child BMI z-scores and their psychological/behavioural determinants, nor worsened psycho-social sequelae

The Prevention of Lower Urinary Tract Symptoms (PLUS) in girls and women: Developing a conceptual framework for a prevention research agenda

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/146323/1/nau23787_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/146323/2/nau23787.pd

Comparison of weight loss data collected by research technicians versus electronic medical records: the PROPEL trial

Background/objectives: Pragmatic trials are increasingly used to study the implementation of weight loss interventions in real-world settings. This study compared researcher-measured body weights versus electronic medical record (EMR)-derived body weights from a pragmatic trial conducted in an underserved patient population. Subjects/methods: The PROPEL trial randomly allocated 18 clinics to usual care (UC) or to an intensive lifestyle intervention (ILI) designed to promote weight loss. Weight was measured by trained technicians at baseline and at 6, 12, 18, and 24 months. A total of 11 clinics (6 UC/5 ILI) with 577 enrolled patients also provided EMR data (n = 561), which included available body weights over the period of the trial. Results: The total number of assessments were 2638 and 2048 for the researcher-measured and EMR-derived body weight values, respectively. The correlation between researcher-measured and EMR-derived body weights was 0.988 (n = 1 939; p \u3c 0.0001). The mean difference between the EMR and researcher weights (EMR-researcher) was 0.63 (2.65 SD) kg, and a Bland-Altman graph showed good agreement between the two data collection methods; the upper and lower boundaries of the 95% limits of agreement are −4.65 kg and +5.91 kg, and 71 (3.7%) of the values were outside the limits of agreement. However, at 6 months, percent weight loss in the ILI compared to the UC group was 7.3% using researcher-measured data versus 5.5% using EMR-derived data. At 24 months, the weight loss maintenance was 4.6% using the technician-measured data versus 3.5% using EMR-derived data. Conclusion: At the group level, body weight data derived from researcher assessments and an EMR showed good agreement; however, the weight loss difference between ILI and UC was blunted when using EMR data. This suggests that weight loss studies that rely on EMR data may require larger sample sizes to detect significant effects. Clinical trial registration: ClinicalTrials.gov number NCT02561221