Solving the kilo-second QPO problem of the intermediate polar GK Persei

We detect the likely optical counterpart to previously reported X-ray QPOs in spectrophotometry of the intermediate polar GK Persei during the 1996 dwarf nova outburst. The characteristic timescales range between 4000--6000 s. Although the QPOs are an order of magnitude longer than those detected in the other dwarf novae we show that a new QPO model is not required to explain the long timescale observed. We demonstrate that the observations are consistent with oscillations being the result of normal-timescale QPOs beating with the spin period of the white dwarf. We determine the spectral class of the companion to be consistent with its quiescent classification and find no significant evidence for irradiation over its inner face. We detect the white dwarf spin period in line fluxes, V/R ratios and Doppler-broadened emission profiles.Comment: 14 pages, 11 figures. Accepted for publication in MNRA

Quantum turbulence at finite temperature: the two-fluids cascade

To model isotropic homogeneous quantum turbulence in superfluid helium, we have performed Direct Numerical Simulations (DNS) of two fluids (the normal fluid and the superfluid) coupled by mutual friction. We have found evidence of strong locking of superfluid and normal fluid along the turbulent cascade, from the large scale structures where only one fluid is forced down to the vorticity structures at small scales. We have determined the residual slip velocity between the two fluids, and, for each fluid, the relative balance of inertial, viscous and friction forces along the scales. Our calculations show that the classical relation between energy injection and dissipation scale is not valid in quantum turbulence, but we have been able to derive a temperature--dependent superfluid analogous relation. Finally, we discuss our DNS results in terms of the current understanding of quantum turbulence, including the value of the effective kinematic viscosity

Vortex spectrum in superfluid turbulence: interpretation of a recent experiment

We discuss a recent experiment in which the spectrum of the vortex line density fluctuations has been measured in superfluid turbulence. The observed frequency dependence of the spectrum, $f^{-5/3}$, disagrees with classical vorticity spectra if, following the literature, the vortex line density is interpreted as a measure of the vorticity or enstrophy. We argue that the disagrement is solved if the vortex line density field is decomposed into a polarised field (which carries most of the energy) and an isotropic field (which is responsible for the spectrum).Comment: Submitted for publication http://crtbt.grenoble.cnrs.fr/helio/GROUP/infa.html http://www.mas.ncl.ac.uk/~ncfb

Analysis of success in beginning reading in relation to knowledge of letter names, experiential background and school adjustment.

Thesis (Ed.M.)--Boston Universit

Promoting positive communication environments: a service evaluation.

Purpose The purpose of this paper is to present an evaluation of a programme of training and support provided to staff, which aimed to encourage supported communication environments for people with learning disabilities. Design/methodology/approach Training, monitoring and support for communication, specifically augmentative and alternative communication (AAC) strategies, was provided by speech and language therapy staff to two residential services over 46 weeks. Staff and service user communications were observed pre- and post-intervention. Findings In one provision there was an increase in service user initiations and the use of some AAC strategies by support staff. In the other provision there was no change in service user initiations and a decrease in the range of AAC strategies used. It appears that some forms for AAC remain challenging for staff to implement. Originality/value This evaluation explores ways of using specialist support services to improve communication environments for people with learning difficulties. Possible reasons for differences in the outcome of the intervention are discussed. Future research into the types of communication interactions experienced by people with learning disabilities across the range of communication styles may be useful so that support staff can be better helped to provide sustained and enriched communication environments

Identification and Characterisation of Technological Topics in the Field of Molecular Biology

This paper focuses on methodological approaches for characterising the specific topics within a technological field based on scientific literature data. We introduce a diachronic clustering analysis approach and some bibliometric indicators. The results are visualised with the software-tool Stanalyst [1]. We are applying our methods to the field "Molecular Biology". This field has grown a great deal in the last decade

The relationship between faith maturity and life satisfaction

Background Studies have been conducted that conclude that having a more mature faith correlates to healthier psychological well-being and healthier personal relationships (Hill & Pargament, 2003; Okun & Stock, 1987; Powell & Pepper, 2015). A significant amount of research has been conducted on life satisfaction, however fewer studies have explored the relationship between life satisfaction and faith maturity. Hawkins, Tan, and Turk (1999) compared a secular inpatient cognitive-behavioral therapy program to a Christian inpatient cognitive-behavioral therapy program and discovered that there was a negative correlation between spiritual well-being and depression, but little has been done beyond this study to examine this relationship. Alessandri, Caprara, and Tisak (2012) also showed that there is a relationship between life orientation and life satisfaction, as well as self-esteem and life satisfaction. Methods and Procedures A survey was sent to the entire student body of 2,900 students at a Christian liberal arts university in the Midwest and 717 responses were received. The survey included questions from Benson, Donahue, and Erickson’s Faith Maturity Scale (1993), Diener, Emmons, Larsen, and Griffin’s Satisfaction with Life Scale (1985), Scheier, Carver, and Bridges’ Revised Life Orientation Test (1994), Rosenberg’s Self Esteem Scale (1965), and demographic questions. Results There was a statistically significant correlation between faith maturity and life satisfaction, although less variability in life satisfaction could be predicted from faith maturity than from self-esteem and life orientation. Using an independent samples t-test, it was found that the life satisfaction of participants in this study was greater than the participants in Diener, et al.’s (1985) study on life satisfaction. Conclusion A significant positive correlation was found between faith maturity and life satisfaction, although this correlation was slightly smaller than the other correlations that were assessed. It was also found that 18 percent of variability in life satisfaction could be predicted by faith maturity