Characterisation of the dynamical quantum state of a zero temperature Bose-Einstein condensate

We describe the quantum state of a Bose-Einstein condensate at zero temperature. By evaluating the Q-function we show that the ground state of Bose-Einstein condensate under the Hartree approximation is squeezed. We find that multimode Schroedinger cat states are generated as the condensate evolves in a ballistic expansion.Comment: 13 pages, 6 figure

The Relationship among Principal Instructional Leadership, Collective Teacher Efficacy, Student Academic Achievement, and Socioeconomic Status in Appalachia Eastern Kentucky High Schools

Current studies have shown that principal instructional leadership can affect student academic achievement as much as 15% (Hallinger & Murphy, 1982; Hallinger & Heck, 1996; Leithwood & Beatty, 2009). Research studies on collective teacher efficacy have shown that teacher efficacy can significantly affect student academic achievement (Tschannen-Moran & Hoy, 2001; Tschannen, Moran &Woolfolk, 2001; Woolfolk; 2004; Goddard, et. al, 2000; Francera, 2009). Previous research has suggested that the effects of socioeconomic status of students can be ameliorated through a combination of principal instructional leadership and collective teacher efficacy (Howley & Howley, 2010; Coleman, 1966). This non-experimental research project developed four hypotheses and three research questions to examine the relationship among principal instructional leadership, collective teacher efficacy and student academic achievement, accounting for socioeconomic status. Teachers provided data for measures of collective teacher efficacy and instructional leadership behaviors by responding to items on the Collective Teacher Efficacy Scale (Goddard, et. al, 2004), and the Principal Instructional Management Rating Scale (Hallinger and Murphy, 1986). Data was obtained from 449 teachers and aggregated to the school level of 42 individual schools. Archived data from the Kentucky Department of Education Report Card provided data for free and reduced lunch percentages (socioeconomic status) and ACT composite scores (student academic achievement). Pearson product-moment correlation coefficients and multiple regressions were computed to identify the direct and indirect influences of principal instructional leadership, collective teacher efficacy and student academic achievement. This study revealed two interesting observations: Teacher Perceptions of Classroom Management was highly correlated to Student Motivation to Learning at r = .479, p = .001, indicating that teacher\u27s sense of efficacy regarding classroom management affects student\u27s motivation to engaging in the learning process. Protects Instructional Time (a subscale of Developing the School Learning Climate Program) was highly correlated to Maintains High Visibility, indicating that the principal\u27s physical presence is as important as is his or her ability to manage the instructional program of the school; it was correlated at r =.485, p = .001. Socioeconomic status, as other studies have shown (Lubbers,1998; Francera, 2009; Goddard, et. al. 2004, Tschannen-Moran, M., & Woolfolk Hoy, A. 2001; Coleman, 1966) was a strong predictor of student academic achievement. It was correlated at an inverse r = -.479, p = .001. Implications for future research merit examining the principal\u27s instructional leadership ability to provide professional development in-service workshops to increase teacher\u27s collective efficacy behaviors, using school-based data to improve and sustain student academic achievement. The goal of finding what predictive measures affect student academic achievement warrants further study

Performance after performance: on the material legacies and their possibilities for transmission

What is the material legacy of performance artworks? What are the possibilities for those legacies, and how much of that depends on the artist's involvement in the historicisation and institutionalisation of their own works? This paper will reflect on the legacies of performance art and its memories and on the ways the museum and the artist work in the co-production of their material manifestations. It will explore this theme through two complementary perspectives one of a curator, and one of a conservator, also bringing together the agencies of artists, institutions, and objects themselves. In bridging the workings of the exhibitio

Constant of Motion for several one-dimensional systems and outlining the problem associated with getting their Hamiltonians

The constants of motion of the following systems are deduced: a relativistic particle with linear dissipation, a no-relativistic particle with a time explicitly depending force, a no-relativistic particle with a constant force and time depending mass, and a relativistic particle under a conservative force with position depending mass. The problem of getting the Hamiltonian for these systems is determined by getting the velocity as an explicit function of position and generalized linear momentum, and this problem can be solved a first approximation for the first above system.Comment: 15 pages, Te