6,632 research outputs found
A limited speech recognition system 2 Final report
Limited speech recognition system for computer voice lin
On Waylen's regular axisymmetric similarity solutions
We review the similarity solutions proposed by Waylen for a regular
time-dependent axisymmetric vacuum space-time, and show that the key equation
introduced to solve the invariant surface conditions is related by a Baecklund
transform to a restriction on the similarity variables. We further show that
the vacuum space-times produced via this path automatically possess a (possibly
homothetic) Killing vector, which may be time-like.Comment: 8 pages, LaTeX2
Self-Calibration of Cameras with Euclidean Image Plane in Case of Two Views and Known Relative Rotation Angle
The internal calibration of a pinhole camera is given by five parameters that
are combined into an upper-triangular calibration matrix. If the
skew parameter is zero and the aspect ratio is equal to one, then the camera is
said to have Euclidean image plane. In this paper, we propose a non-iterative
self-calibration algorithm for a camera with Euclidean image plane in case the
remaining three internal parameters --- the focal length and the principal
point coordinates --- are fixed but unknown. The algorithm requires a set of point correspondences in two views and also the measured relative
rotation angle between the views. We show that the problem generically has six
solutions (including complex ones).
The algorithm has been implemented and tested both on synthetic data and on
publicly available real dataset. The experiments demonstrate that the method is
correct, numerically stable and robust.Comment: 13 pages, 7 eps-figure
Modelling Direct Current Resistivity Of Wood Polymer Composites
Resistivity of wood and treated wood decreased with increasing MC and increasing polymer loading. A rule of mixtures model using decreasing resistivities of polymer and wood with increase in MC agreed reasonably with experimental results
The aftermath of a perioperative death: who cares for the clinician?
Working in the perioperative environment entails exposure to traumatic and sometimes catastrophic events such as a perioperative death (PD). PD can be a uniquely devastating experience and has the potential to lead to long-term negative physical and psychological effects for the staff involved, especially when appropriate support is absent. In a number of practice settings, these destabilizing effects have been shown to detrimentally compromise individual and team performance.1 This is of particular concern in the perioperative setting, since deterioration of individual competence and subsequent team performance has been directly linked to poor patient outcomes. Despite numerous studies establishing this link, there has been little research exploring clinicians' experiences of PD and organisational support for front-line clinicians remains alarmingly inconsistent. The question remains, who is responsible to the clinician in the aftermath of a perioperative death
Swelling of a Cell Lumen Filled and A Cell-Wall Bulked Wood Polymer Composite in Water
Liquid water swelling of lumen-filled and cell-wall bulked wood polymer composite (WPC) samples was measured at room temperature and 80 C. Ultimate swelling was greater (approximately that of untreated wood) and moisture diffusion coefficient lower for the lumen filled wood. The higher density, lumen filled sample had lower swelling than the lower density one. At 80 C, fiber saturation points (FSP) were 8% for the cell-wall samples and above 20% for the cell lumen samples. The FSP for more highly loaded cell lumen samples was lower than that for lower loading
Strong lensing reveals jets in a sub-microJy radio quiet quasar
We present e-MERLIN and EVN observations which reveal unambiguous jet
activity within radio quiet quasar HS~0810+2554. With an intrinsic flux density
of 880~nJy, this is the faintest radio source ever imaged. The findings present
new evidence against the idea that radio loud and radio quiet quasars are
powered by different underlying radio emission mechanisms, showing instead that
the same AGN mechanism can operate as the dominant source of radio emission
even in the very lowest radio luminosity quasars. Thanks to strong
gravitational lensing, our source is not only visible, but with VLBI is imaged
to a scale of just 0.27~pc: the highest ever resolution image of a radio quiet
quasar. Brightness temperatures of at least ~K are associated
with two highly compact components, and subsequent modelling of the lensed
system has revealed that the components are linearly aligned on opposing sides
of the optical quasar core, with the typical morphology of a compact symmetric
object (CSO). Given that this source has been found to fall on the radio--FIR
correlation, we suggest that the radio--FIR correlation cannot always be used
to rule out AGN activity in favour of star-formation activity. The correlation
-- or at least its scatter -- may conceal the coexistence of kinetic and
radiative feedback modes in AGN. Modelling of the lensing mass itself points to
a non-smooth mass distribution, hinting at the presence of dark matter
substructure which has manifested as astrometric perturbations of the VLBI
lensed images, posing no threat to the CDM paradigm.Comment: 16 pages, 10 figures; submitted to MNRAS: v1 includes minor revisions
made after reviewer's comments; v2 corrects the order of panels in Fig. 2,
and provides a colour image in Fig.
Sacrococcygeal germ-cell tumours - the Red Cross War Memorial Children's hospital experience, 1980 - 1996
Objective. To document the experience of Red Cross War Memorial Children's Hospital in the treatment of sacrococcygeal germ-eell tumours.Patients. Twenty-seven patients with sacrococcygeal germ-cell tumours were treated in our hospital from 1980 to 1996.Design. A retrospective review of these patients' records was undertaken.Results. There were 19 female and 8 male patients. Seventeen (63%) presented in the neonatal period, 13 on the first day of life. Complete surgical resection of the tumour was achieved in all patients with mature or immature teratomas (20 patients) and in 2 neonates with malignant tumours. The first of these 2 neonates, with a malignant teratoma, was not given chemotherapy and remains well 10 years later. The second, with a yolk-sac tumour, also received no initial chemotherapy. He relapsed at the age of 9 months and was successfully treated with repeat excision and chemotherapy. All 5 patients first diagnosed after the age of 1 year had malignant tumours. These patients had incomplete surgical resection (3) or biopsy only (2), and 3 were successfully treated with chemotherapy. One patient relapsed with yolksac tumour after initial complete resection cif a mature teratoma. She was successfully treated with repeat surgery and chemotherapy
Brane Gravitational Extension of Dirac's "Extensible Model of the Electron"
A gravitational extension of Dirac's "Extensible model of the electron" is
presented. The Dirac bubble, treated as a 3-dim electrically charged brane, is
dynamically embedded within a 4-dim -symmetric Reissner-Nordstrom bulk.
Crucial to our analysis is the gravitational extension of Dirac's brane
variation prescription; its major effect is to induce a novel geometrically
originated contribution to the energy-momentum tensor on the brane. In turn,
the effective potential which governs the evolution of the bubble exhibits a
global minimum, such that the size of the bubble stays finite (Planck scale)
even at the limit where the mass approaches zero. This way, without
fine-tuning, one avoids the problem so-called 'classical radius of the
electron'.Comment: 6 PRD pages, 4 figures; References adde
On Parametrically Excited Flexural Motion of an Extensible and Shearable Rod with a Heavy Attachment
A simple Cosserat model is used to explore the coupled planar flemural and arial vibrations of a slender rod clamped at one end with a heauy attached mass free to move at the other. By assuming that the inertia of the rod is small compared to that of the attached mass it is shown how the equations of motionreduce to a dynamical system. The effects of grauity on the rod can be incorporated within this frame-work and the linearised stability of the system discussed in terms of solutions to the Mathieu-Hill equation
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