820 research outputs found
Developing a context-appropriate framework for measuring quality in initial teacher education
Acknowledgements We wish to thank colleagues Nicola Carse, David Lewin and Kate Wall for their insightful comments on earlier drafts, and Emilee Rauschenberger for leading the work on the original literature review. We also thank all members of the wider MQuITE team for their contribution to the development of the framework reported here (see www.mquite.scot for list of team members). The MQuITE project is funded by Scottish Government and supported by the General Teaching Council for Scotland.Peer reviewedPublisher PD
Fission of hyper-hyperdeformed Ni: a clustering analysis with in mean-field approaches
The structure of 56Ni is sudied by using the non-relativistic Skyrme Hartree-Fock and the relativistic Hartree approximation in an axially deformed cylindrical coordinate. We found several intrinsic excited states, including the spherical ground-state solution. Without including any extra -cluster correlations, the possible cluster configurations of the resonance states are analyzed, showing the multipleN=Z, -nucleus like, cluster structures for hyper-deformed states, but, contrary to the recent experimental possibility of a ternary fission decay, we predict a two cluster or symmetric fission configuration for the hyper-hyperdeformed stat
JWalk: a tool for lazy, systematic testing of java classes by design introspection and user interaction
Popular software testing tools, such as JUnit, allow frequent retesting of modified code; yet the manually created test scripts are often seriously incomplete. A unit-testing tool called JWalk has therefore been developed to address the need for systematic unit testing within the context of agile methods. The tool operates directly on the compiled code for Java classes and uses a new lazy method for inducing the changing design of a class on the fly. This is achieved partly through introspection, using Java’s reflection capability, and partly through interaction with the user, constructing and saving test oracles on the fly. Predictive rules reduce the number of oracle values that must be confirmed by the tester. Without human intervention, JWalk performs bounded exhaustive exploration of the class’s method protocols and may be directed to explore the space of algebraic constructions, or the intended design state-space of the tested class. With some human interaction, JWalk performs up to the equivalent of fully automated state-based testing, from a specification that was acquired incrementally
Cluster formation probability in the trans-tin and trans-lead nuclei
Within our fission model, the Coulomb and proximity potential model (CPPM)
cluster formation probabilities are calculated for different clusters ranging
from carbon to silicon for the parents in the trans-tin and trans- lead
regions. It is found that in trans-tin region the 12^C, 16^O, 20^Ne and 24^Mg
clusters have maximum cluster formation probability and lowest half lives as
compared to other clusters. In trans-lead region the 14^C, 18, 20^O, 23^F,
24,26^Ne, 28,30^Mg and 34^Si clusters have the maximum cluster formation
probability and minimum half life, which show that alpha like clusters are most
probable for emission from trans-tin region while non-alpha clusters are
probable from trans-lead region. These results stress the role of neutron
proton symmetry and asymmetry of daughter nuclei in these two cases.Comment: 20 pages, 6 figure
Highly deformed Ca configurations in Si + C
The possible occurrence of highly deformed configurations in the Ca
di-nuclear system formed in the Si + C reaction is investigated
by analyzing the spectra of emitted light charged particles. Both inclusive and
exclusive measurements of the heavy fragments (A 10) and their
associated light charged particles (protons and particles) have been
made at the IReS Strasbourg {\sc VIVITRON} Tandem facility at bombarding
energies of Si) = 112 MeV and 180 MeV by using the {\sc ICARE}
charged particle multidetector array. The energy spectra, velocity
distributions, and both in-plane and out-of-plane angular correlations of light
charged particles are compared to statistical-model calculations using a
consistent set of parameters with spin-dependent level densities. The analysis
suggests the onset of large nuclear deformation in Ca at high spin.Comment: 33 pages, 11 figure
Asteroseismology of Eclipsing Binary Stars in the Kepler Era
Eclipsing binary stars have long served as benchmark systems to measure
fundamental stellar properties. In the past few decades, asteroseismology - the
study of stellar pulsations - has emerged as a new powerful tool to study the
structure and evolution of stars across the HR diagram. Pulsating stars in
eclipsing binary systems are particularly valuable since fundamental properties
(such as radii and masses) can determined using two independent techniques.
Furthermore, independently measured properties from binary orbits can be used
to improve asteroseismic modeling for pulsating stars in which mode
identifications are not straightforward. This contribution provides a review of
asteroseismic detections in eclipsing binary stars, with a focus on space-based
missions such as CoRoT and Kepler, and empirical tests of asteroseismic scaling
relations for stochastic ("solar-like") oscillations.Comment: 28 pages, 12 figures, 2 tables; Proceedings of the AAS topical
conference "Giants of Eclipse" (AASTCS-3), July 28 - August 2 2013, Monterey,
C
Phenomenology of the Lense-Thirring effect in the Solar System
Recent years have seen increasing efforts to directly measure some aspects of
the general relativistic gravitomagnetic interaction in several astronomical
scenarios in the solar system. After briefly overviewing the concept of
gravitomagnetism from a theoretical point of view, we review the performed or
proposed attempts to detect the Lense-Thirring effect affecting the orbital
motions of natural and artificial bodies in the gravitational fields of the
Sun, Earth, Mars and Jupiter. In particular, we will focus on the evaluation of
the impact of several sources of systematic uncertainties of dynamical origin
to realistically elucidate the present and future perspectives in directly
measuring such an elusive relativistic effect.Comment: LaTex, 51 pages, 14 figures, 22 tables. Invited review, to appear in
Astrophysics and Space Science (ApSS). Some uncited references in the text
now correctly quoted. One reference added. A footnote adde
Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
The chromosphere is a thin layer of the solar atmosphere that bridges the
relatively cool photosphere and the intensely heated transition region and
corona. Compressible and incompressible waves propagating through the
chromosphere can supply significant amounts of energy to the interface region
and corona. In recent years an abundance of high-resolution observations from
state-of-the-art facilities have provided new and exciting ways of
disentangling the characteristics of oscillatory phenomena propagating through
the dynamic chromosphere. Coupled with rapid advancements in
magnetohydrodynamic wave theory, we are now in an ideal position to thoroughly
investigate the role waves play in supplying energy to sustain chromospheric
and coronal heating. Here, we review the recent progress made in
characterising, categorising and interpreting oscillations manifesting in the
solar chromosphere, with an impetus placed on their intrinsic energetics.Comment: 48 pages, 25 figures, accepted into Space Science Review
Attitudes towards the male contraceptive pill:Psychosocial and cultural explanations for delaying a marketable product
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