379 research outputs found
Numerical simulations of pinhole and single-mode fibre spatial filters for optical interferometers
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International Atomic Energy Agency (IAEA) initiatives: Records management for deep and near surface geologic repositories
The international scientific community has long had an interest in determining methods by which information regarding nuclear waste repositories, and the inherent danger to humanity, could be passed from generation to generation and society to society. Because nuclear waste will remain radioactive for thousands of years future generations must be warned of the dangers thus eliminating intentional or inadvertent intrusion. Member States of the IAEA have determined that the principle safety of such sites must not rely solely on long term institutional arrangements for the retention of information. It is believed that repository siting, design, operation and postoperation information should be gathered, managed and retained so that this information remains accessible to future societies over a very long period of time. The radionuclide life is 10,000 years; thus the retention of information continues beyond current societies, cultures and languages, and must be continually migrated to new retrieval technologies to assure access
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Traceability and retrievability: Documentation, the bridge from science to compliance
In this day of regulatory compliance, the fact that good science was practiced and documented is, in and of itself, not enough to assure a successful licensing or permitting result. A new level of documentation, that clearly walks a non-project reviewer through the traceability of all activities and decisions is required for successful acceptance of scientific results. Compliance reviewers (whether the Nuclear Regulatory Commission (NRC), Environmental Protection Agency (EPA), etc.) expect to verify the results of the scientific and program activities without the physical presence of the person or persons that conducted the activity. Traceability of activities and associated decisions through the retrieval of all associated records is a must. This presentation is based on lessons learned from the various quality assurance (QA) audits and program reviews of Sandia National Laboratories, Nuclear Waste Management Programs Center, scientific and programmatic documentation. The authors build a bridge from science to compliance from lessons learned. Here now is a somewhat fictional rendition of actual scientific testing and compliance support activities
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United States of America activities relative to the International Atomic Energy Agency (IAEA) initiative: Records management for deep geologic repositories
The International Atomic Energy Agency (IAEA) has conducted consultant and advisory meetings to prepare a Technical Document which is intended to provide guidance to all IAEA Member States (otherwise known as countries) that are currently planning, designing, constructing or operating a deep or near surface geological repository for the storage and protection of vitrified high-level radioactive waste, spent fuel waste and TRU-waste (transuranic). Eleven countries of the international community are presently in various stages of siting, designing, or constructing deep geologic repositories. Member States of the IAEA have determined that the principle safety of such completed and operation sites must not rely solely on long term institutional arrangements for the retention of information. It is believed that repository siting, design, operation and postoperation information should be gathered, managed and retained in a manner that will provide information to future societies over a very long period of time. The radionuclide life is 10,000 years thus the retention of information must outlive current societies, languages, and be continually migrated to new technology to assure retrieval. This presentation will provide an overview of the status of consideration and implementation of these issues within the United States efforts relative to deep geologic repository projects
Spectroscopic evidence for the binary nature of AM CVn
We analysed archival spectroscopic data of AM CVn taken with the William
Herschel Telescope in 1996. In the literature two orbital periods for AM CVn
are proposed. A clear S-wave in the HeI 4471, 4387 and 4143 \AA lines is
revealed when the spectra are folded on the 1029 s period. No signature of this
S-wave is seen when folded on 1051 s. Doppler tomography of the line profiles
shows a clear signature of the hotspot. Using this we can constrain the value
of K_2 to lie between 210 and 280 km/s. Our work confirms the binary nature of
AM CVn beyond any doubt, establishes 1028.73 s as the true orbital period and
supports the interpretation of AM CVn as a permanent superhump system.Comment: Accepted by MNRA
Numerical Simulations of Pinhole and Single Mode Fibre Spatial Filters for Optical Interferometers
We use a numerical simulation to investigate the effectiveness of pinhole
spatial filters at optical/IR interferometers and to compare them with
single-mode optical fibre spatial filters and interferometers without spatial
filters. We show that fringe visibility measurements in interferometers
containing spatial filters are much less affected by changing seeing conditions
than equivalent measurements without spatial filters. This reduces visibility
calibration uncertainties, and hence can reduce the need for frequent
observations of separate astronomical sources for calibration of visibility
measurements. We also show that spatial filters can increase the
signal-to-noise ratios of visibility measurements and that pinhole filters give
signal-to-noise ratios within 17% of values obtained with single-mode fibres
for aperture diameters up to 3r_0. Given the simplicity of the use of pinhole
filters we suggest that it represents a competitive, if not optimal, technique
for spatial filtering in many current and next generation interferometers.Comment: 7 pages, 7 postscript figures. Accepted by MNRA
ASCA X-ray observations of the disk wind in the dwarf nova Z Camelopardalis
We present ASCA observations of the dwarf nova Z Camelopardalis during
outburst and during a transition from quiescence to another outburst.
At the beginning of the transition the X-ray count rate was an order of
magnitude higher and the spectrum much harder than during the outburst. As the
transition progressed, the spectrum remained hard as the X-ray flux decreased
by a factor of 3, with no spectral softening. Spectral modelling reveals an
optically-thin, high-temperature component (kT10 keV) which dominates
the transition observation and is also observed during outburst. This is
expected from material accreting onto the white dwarf surface. The outburst
spectra require additional emission at lower temperatures, either through an
additional discrete temperature component, or a combination of a cooling flow
model and an ionised absorber.
Fits to both observations show large amounts of absorption
(cm), two orders of magnitude greater than the
measured interstellar value, and consistent with UV measurements of the
outburst. This suggests that a disk wind is present even in the earliest stages
of outburst, possibly before the outburst heating wave has reached the boundary
layer.Comment: 9 pages, 9 figures, MNRAS Accepte
Rotational symmetries of crystals with defects
I use the theory of Lie groups/algebras to discuss the symmetries of crystals with uniform distributions of defects
The Glauber model and the heavy ion reaction cross section
We reexamine the Glauber model and calculate the total reaction cross section
as a function of energy in the low and intermediate energy range, where many of
the corrections in the model, are effective.
The most significant effect in this energy range is by the modification of
the trajectory due to the Coulomb field. The modification in the trajectory due
to nuclear field is also taken into account in a self consistent way.
The energy ranges in which particular corrections are effective, are
quantified and it is found that when the center of mass energy of the system
becomes 30 times the Coulomb barrier, none of the trajectory modification to
the Glauber model is really required.
The reaction cross sections for light and heavy systems, right from near
coulomb barrier to intermediate energies have been calculated. The exact
nuclear densities and free nucleon-nucleon (NN) cross sections have been used
in the calculations. The center of mass correction which is important for light
systems, has also been taken into account.
There is an excellent agreement between the calculations with the modified
Glauber model and the experimental data. This suggests that the heavy ion
reactions in this energy range can be explained by the Glauber model in terms
of free NN cross sections without incorporating any medium modification.Comment: RevTeX, 21 pages including 9 Postscript figures, submitted to Phys.
Rev.
Conformational transitions of a semiflexible polymer in nematic solvents
Conformations of a single semiflexible polymer chain dissolved in a low
molecular weight liquid crystalline solvents (nematogens) are examined by using
a mean field theory. We takes into account a stiffness and partial
orientational ordering of the polymer. As a result of an anisotropic coupling
between the polymer and nematogen, we predict a discontinuous (or continuous)
phase transition from a condensed-rodlike conformation to a swollen-one of the
polymer chain, depending on the stiffness of the polymer. We also discuss the
effects of the nematic interaction between polymer segments.Comment: 4 pages, 4 figure
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