23,708 research outputs found
Are Superhumps Good Measures of the Mass Ratio for AM CVn Systems?
We extend recent work that included the effect of pressure forces to derive
the precession rate of eccentric accretion discs in cataclysmic variables to
the case of double degenerate systems. We find that the logical scaling of the
pressure force in such systems results in predictions of unrealistically high
primary masses. Using the prototype AM CVn as a calibrator for the magnitude of
the effect, we find that there is no scaling that applies consistently to all
the systems in the class. We discuss the reasons for the lack of a superhump
period to mass ratio relationship analogous to that known for SU UMa systems
and suggest that this is because these secondaries do not have a single valued
mass-radius relationship. We highlight the unreliability of mass-ratios derived
by applying the SU UMa expression to the AM CVn binaries.Comment: 7 pages, 2 tables, to appear in Monthly Notices of the Royal
Astronomical Societ
Don’t get involved: an examination of how public sector organisations in England are involving disabled people in the Disability Equality Duty
The Disability Equality Duty (DED) came into force in December 2006. It stipulated that all public sector organisations were to develop policies to promote the equality of disabled people as staff members, consumers or visitors. Its emergence comes as part of a network of social policies developed over the last 20 years to promote disability rights and citizenship in the UK. However unlike previous legislation, the DED set in place the need for organisations to be pro-active in their policies and work with disabled people to move towards change in public sector cultures and working practices. This article reports on this early stage of implementation in England. Findings show that whilst some progress has been made in securing change, practice varied greatly. Therefore if a fundamental change in the culture of work and service provision is to be secured, this key requirement will need to be given a higher priority by organisations
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The rocks from space initiative and the space safari
This paper reports the successes of a new initiative in the UK using electronic resources, such as virtual learning environments and e-classrooms, for planetary and space science public engagement activities
Differentiation and Replication of Spots in a Reaction Diffusion System with Many Chemicals
The replication and differentiation of spots in reaction diffusion equations
are studied by extending the Gray-Scott model with self-replicating spots to
include many degrees of freedom needed to model systems with many chemicals. By
examining many possible reaction networks, the behavior of this model is
categorized into three types: replication of homogeneous fixed spots,
replication of oscillatory spots, and differentiation from `m ultipotent
spots'. These multipotent spots either replicate or differentiate into other
types of spots with different fixed-point dynamics, and as a result, an
inhomogeneous pattern of spots is formed. This differentiation process of spots
is analyzed in terms of the loss of chemical diversity and decrease of the
local Kolmogorov-Sinai entropy. The relevance of the results to developmental
cell biology and stem cells is also discussed.Comment: 8 pages, 12 figures, Submitted to EP
An in-depth examination of the implementation of the Disability Equality Duty in England
This seven-month study examined the implementation of the Disability Equality Duty (DED) in England. The DED, introduced through the Disability Discrimination Act 2005, applies to public authorities in England, Wales and Scotland
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Did organic compounds in the Tagish Lake meteorite form via catalytic processes in the solar nebula and within parent bodies?
Role of Landau-Rabi quantization of electron motion on the crust of magnetars within the nuclear energy density functional theory
Magnetic fields of order G have been measured at the surface of
some neutron stars, and much stronger magnetic fields are expected to be
present in the solid region beneath the surface. The effects of the magnetic
field on the equation of state and on the composition of the crust due to
Landau-Rabi quantization of electron motion are studied. Both the outer and
inner crustal regions are described in a unified and consistent way within the
nuclear-energy density functional theory.Comment: 23 pages, 11 figure
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