100,589 research outputs found
E2 component in subcoulomb breakup of ^{8}B
We calculate the angular distribution and total cross section of the ^{7}Be
fragment emitted in the break up reaction of ^{8}B on ^{58}Ni and ^{208}Pb
targets at the subCoulomb beam energy of 25.8 MeV, within the non-relativistic
theory of Coulomb excitation with proper three-body kinematics. The relative
contributions of the E1, E2 and M1 multipolarities to the cross sections are
determined. The E2 component makes up about 65% and 40% of the ^{7}Be total
cross section for the ^{58}Ni and ^{208}Pb targets respectively. We find that
the extraction of the astrophysical S-factor, S_{17}(0), for the
^{7}Be(p,\gamma)^8B reaction at solar energies from the measurements of the
cross sections of the ^{7}Be fragment in the Coulomb dissociation of ^{8}B at
sub-Coulomb energies is still not free from the uncertainties of the E2
component.Comment: Revised version (correcting earlier errors) submitted to Phys. Letts.
A computer analysis program for interfacing thermal and structural codes
A software package has been developed to transfer three-dimensional transient thermal information accurately, efficiently, and automatically from a heat transfer analysis code to a structural analysis code. The code is called three-dimensional TRansfer ANalysis Code to Interface Thermal and Structural codes, or 3D TRANCITS. TRANCITS has the capability to couple finite difference and finite element heat transfer analysis codes to linear and nonlinear finite element structural analysis codes. TRANCITS currently supports the output of SINDA and MARC heat transfer codes directly. It will also format the thermal data output directly so that it is compatible with the input requirements of the NASTRAN and MARC structural analysis codes. Other thermal and structural codes can be interfaced using the transfer module with the neutral heat transfer input file and the neutral temperature output file. The transfer module can handle different elemental mesh densities for the heat transfer analysis and the structural analysis
Computer simulation model of terminal air traffic and PWI systems, phase 1
Collision avoidance computer simulation model of terminal air traffic and proximity warning indicator system
SCUBA polarisation observations of the magnetic fields in the prestellar cores L1498 and L1517B
We have mapped linearly polarized dust emission from the prestellar cores
L1498 and L1517B with the James Clerk Maxwell Telescope (JCMT) using the
Submillimetre Common User Bolometer Array (SCUBA) and its polarimeter SCUBAPOL
at a wavelength of 850um. We use these measurements to determine the
plane-of-sky magnetic field orientation in the cores. In L1498 we see a
magnetic field across the peak of the core that lies at an offset of 19 degrees
to the short axis of the core. This is similar to the offsets seen in previous
observations of prestellar cores. To the southeast of the peak, in the
filamentary tail of the core, we see that the magnetic field has rotated to lie
almost parallel to the long axis of the filament. We hypothesise that the field
in the core may have decoupled from the field in the filament that connects the
core to the rest of the cloud. We use the Chandrasekhar-Fermi (CF) method to
measure the plane-of-sky field strength in the core of L1498 to be 10 +/- 7 uG.
In L1517B we see a more gradual turn in the field direction from the northern
part of the core to the south. This appears to follow a twist in the filament
in which the core is buried, with the field staying at a roughly constant 25
degree offset to the short axis of the filament, also consistent with previous
observations of prestellar cores. We again use the CF method and calculate the
magnetic field strength in L1517B also to be 30 +/- 10 uG. Both cores appear to
be roughly virialised. Comparison with our previous work on somewhat denser
cores shows that, for the denser cores, thermal and non-thermal (including
magnetic) support are approximately equal, while for the lower density cores
studied here, thermal support dominates.Comment: 6 pages, 2 figures; accepted for publication by MNRA
Adherence to cardiac rehabilitation guidelines: a survey of rehabilitation programmes in the United Kingdom
Two key recommendations of recent guidelines are that cardiac rehabilitation requires the skills of a range of professionals and that the patient should receive a menu based programme after an individual assess ment of needs. A previous survey of 25 cardiac rehabilitation programmes found little congruence with these guidelines and noted that physicians were particularly unlikely to be involved. We extended this inquiry to include all of the discoverable rehabilitation programmes in the United Kingdom
Classification by means of B-spline potential functions with applications to remote sensing
A method is presented for using B-splines as potential functions in the estimation of likelihood functions (probability density functions conditioned on pattern classes), or the resulting discriminant functions. The consistency of this technique is discussed. Experimental results of using the likelihood functions in the classification of remotely sensed data are given
Study of the concept of inertially aided barometric altimetry system for supersonic aircraft
Study of concept of inertially aided barometric altimetry system to meet vertical separation requirements of 1000 and 2000 feet for Mach 3.5 aircraft in altitude hold at 80,000 fee
Chrysler improved numerical differencing analyzer for third generation computers CINDA-3G
New and versatile method has been developed to supplement or replace use of original CINDA thermal analyzer program in order to take advantage of improved systems software and machine speeds of third generation computers. CINDA-3G program options offer variety of methods for solution of thermal analog models presented in network format
The Algebra of Strand Splitting. II. A Presentation for the Braid Group on One Strand
Presentations are computed for a braided version BV of Thompson's group V and
for V itself showing that there is an Artin group/Coxeter group relation
between them. The presentation for V is obtained from that for BV by declaring
all that all generators are involutions.Comment: 15 page
Beyond the hybrid library : libraries in a Web 2.0 world
Considers the development of social networking and the concept of Web 2.0. Looks at the implications for libraries and how traditional competences remain relevant. Explores what libraries are doing and must do to remain relevan
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