5,156 research outputs found
On Generalized Monopole Spherical Harmonics and the Wave Equation of a Charged Massive Kerr Black Hole
We find linearly independent solutions of the Goncharov-Firsova equation in
the case of a massive complex scalar field on a Kerr black hole. The solutions
generalize, in some sense, the classical monopole spherical harmonic solutions
previously studied in the massless cases.Comment: Accepted for publication, Mod. Phys. Lett. A. 13 pages, including
reference
The high energy limit of the trajectory representation of quantum mechanics
The trajectory representation in the high energy limit (Bohr correspondence
principle) manifests a residual indeterminacy. This indeterminacy is compared
to the indeterminacy found in the classical limit (Planck's constant to 0)
[Int. J. Mod. Phys. A 15, 1363 (2000)] for particles in the classically allowed
region, the classically forbiden region, and near the WKB turning point. The
differences between Bohr's and Planck's principles for the trajectory
representation are compared with the differences between these correspondence
principles for the wave representation. The trajectory representation in the
high energy limit is shown to go to neither classical nor statistical
mechanics. The residual indeterminacy is contrasted to Heisenberg uncertainty.
The relationship between indeterminacy and 't Hooft's information loss and
equivalence classes is investigated.Comment: 12 pages of LaTeX. No figures. Incorporated into the "Proceedings of
the Seventh International Wigner Symposium" (ed. M. E. Noz), 24-29 August
2001, U. of Maryland. Proceedings available at
http://www.physics.umd.edu/robo
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‘Jugglers’, ‘copers’ and ‘strugglers’: academics’ perceptions of being a head of department in a post-1992 UK university and how it influences their future careers
This study investigates the experiences of academics who became department heads in a post-1992 UK university and explores the influence that being in the position has on their planned future academic career. Drawing on life history interviews undertaken with 17 male and female heads of department, the paper constitutes an in-depth study of their careers in the same university. The findings suggest that academics who become department heads not only need the capacity to assume a range of personal and professional identities, but need flexibility to regularly adopt and switch between them. Whether individuals can successfully balance and manage such multiple identities, or whether they experience major conflicts within or between them, greatly affects their experiences of being a head of department and seems to influence their subsequent career decisions. The paper concludes by proposing a conceptual framework and typology to interpret the career trajectories of academics that became department heads in the case university
OPERA data and The Equivalence Postulate of Quantum Mechanics
An interpretation of the recent results reported by the OPERA collaboration
is that neutrinos propagation in vacuum exceeds the speed of light. It has been
further been suggested that this interpretation can be attributed to the
variation of the particle speed arising from the Relativistic Quantum Hamilton
Jacobi Equation. I show that this is in general not the case. I derive an
expression for the quantum correction to the instantaneous relativistic
velocity in the framework of the relativistic quantum Hamilton-Jacobi equation,
which is derived from the equivalence postulate of quantum mechanics. While the
quantum correction does indicate deviations from the classical energy--momentum
relation, it does not necessarily lead to superluminal speeds. The quantum
correction found herein has a non-trivial dependence on the energy and mass of
the particle, as well as on distance travelled. I speculate on other possible
observational consequences of the equivalence postulate approach.Comment: 8 pages. Standard LaTex. References adde
Generalized vegetation map of north Merrit Island based on a simplified multispectral analysis
A simplified system for classification of multispectral data was used for making a generalized map of ground features of North Merritt Island. Subclassification of vegetation within broad categories yielded promising results which led to a completely automatic method and to the production of satisfactory detailed maps. Changes in an area north of Happy Hammocks are evidently related to water relations of the soil and are not associated with the last winter freeze-damage which affected mainly the mangrove species, likely to reestablish themselves by natural processes. A supplementary investigation involving reflectance studies in the laboratory has shown that the reflectance by detached citrus leaves, of wavelengths lying between 400 microns and 700 microns, showed some variation over a period of seven days during which the leaves were kept in a laboratory atmosphere
Assessing Observed Character Strengths in Groups using Streamed Video and Video iPods
Positive psychology is a developing trend in modern psychological studies. Among the many facets of positive psychology are the values in action signature strengths, a collection of 24 positive attributes that are related to basic good character traits in all people. These strengths were recognized and researched as a way in which to cultivate good character through examining the positive side of individuals. The research examined the effectiveness of the values in action signature strengths survey as an evaluation tool to be used in group development activities
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Disabled people and the Internet: experiences, barriers and opportunities
The UK government aims to make all its information and transactions available electronically by 2005. General use of the Internet also continues to grow. This report investigates the Internet's barriers and benefits for disabled people, and considers whether it acts as a means to reduce their social exclusion.
The study surveys the views and experiences of disabled people, both Internet users and non-users. Topics covered include: what the Internet is used for; use of and difficulties with assistive devices (special equipment and adaptations needed by some disabled people in order to use computers); how people learn to use the Internet; views of website accessibility; advantages and disadvantages of Internet usage.
It also explores participants' restrictions on using the Internet, and people's reasons for not using it. There has been little previous research in this area, but the authors review the existing literature. The report finds that many practical problems - such as the cost of training, finding appropriate assistive devices, website accessibility - all inhibit Internet opportunities for many disabled people
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