59,320 research outputs found
Static and Dynamic Pressure Distributions in a Short Labyrinth Seal
As part of a study into turbine blade tip destabilizing forces, a seals test rig was built in which spin rate, circular whirl rate, direction and amplitude of inlet swirl angle, and eccentricity can all be controlled over wide ranges, and measurements can be made at gap Reynolds numbers up to about 2 x 10(exp 4). This facility is described and preliminary data is presented for a one cavity labyrinth seal with a flat, stator mounted land. The impact of different flow coefficients for the first and second knives on the rotordynamic coefficients was found. While this effect is dominant for the direct forces, it should also be incorporated into calculations of cross forces where it has an impact under many conditions
Final-State Interactions in the Superscaling Analysis of Neutral-Current Quasielastic Neutrino Scattering
Effects of strong final-state interactions in the superscaling properties of
neutral-current quasielastic neutrino cross sections are investigated using the
Relativistic Impulse Approximation as guidance. First- and second-kind scaling
are analyzed for neutrino beam energies ranging from 1 to 2 GeV for the cases
of 12C, 16O and 40Ca. Different detection angles of the outgoing nucleon are
considered in order to sample various nucleon energy regimes. Scaling of the
second kind is shown to be very robust. Validity of first-kind scaling is found
to be linked to the kinematics of the process. Superscaling still prevails even
in the presence of very strong final-state interactions, provided that some
kinematical restrains are kept, and the conditions under which superscaling can
be applied to predict neutral-current quasielastic neutrino scattering are
determined.Comment: 39 pages, 16 figures, accepted for publication in Phys. Rev.
Dissecting the Interplay Between Elected Members and Officials in Board Level Technology Decisions: the case of a local authority in England
Digital investment and the successful selection and implementation of technology is crucial to local government success and yet there is a dearth of research evaluating how these decisions are made. And yet there is a dearth of research evaluating how Boards and executives of all kinds make these decisions and the role they play in influencing asset deployment in the digital space. In this regard, government, and especially local government is not only sparsely investigated as part of the existing body of knowledge but does not function neatly when compared to commercial organizations and the profit motive. This paper addresses the shortfall by investigating the interplay between elected members and Boards of local government in terms of complex decision-making processes surrounding technology investment. Empirically, this research adopts a case study approach and qualitative questioning of key elected and appointed actors allowing us to dissect the phenomenon
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Medical-Legal Partnerships to Support Continuity of Care for Immigrants Impacted by HIV: Lessons Learned from California.
The United States (US) has experienced a surge of anti-immigrant policies and rhetoric, raising concerns about the influence on health outcomes for immigrants living in the US. We conducted qualitative interviews (n = 20) with health care and social service providers, attorneys, and legal/policy experts in California to understand how agencies were maintaining access to HIV care and prevention for immigrant clients. We conducted a thematic analysis to describe the role of medical-legal partnerships (MLPs) and document best practices. Informants reported high demand for legal services. Referrals were facilitated by case managers, medical providers, and pre-existing relationships between clinics and legal agencies. Informants identified a need for additional funding and further guidance on screening for and supporting patients with legal needs. MLPs have the capacity to create sustainable, efficient, comprehensive structural changes that minimize barriers to HIV prevention and treatment and improve health outcomes among immigrant populations
New measurements of magnetic fields of roAp stars with FORS1 at the VLT
Magnetic fields play a key role in the pulsations of rapidly oscillating Ap
(roAp) stars since they are a necessary ingredient of all pulsation excitation
mechanisms proposed so far. This implies that the proper understanding of the
seismological behaviour of the roAp stars requires knowledge of their magnetic
fields. However, the magnetic fields of the roAp stars are not well studied.
Here we present new results of measurements of the mean longitudinal field of
14 roAp stars obtained from low resolution spectropolarimetry with FORS1 at the
VLT.Comment: 5 pages, accepted for publication in A&
High energy neutrino oscillation at the presence of the Lorentz Invariance Violation
Due to quantum gravity fluctuations at the Planck scale, the space-time
manifold is no longer continuous, but discretized. As a result the Lorentz
symmetry is broken at very high energies. In this article, we study the
neutrino oscillation pattern due to the Lorentz Invariance Violation (LIV), and
compare it with the normal neutrino oscillation pattern due to neutrino masses.
We find that at very high energies, neutrino oscillation pattern is very
different from the normal one. This could provide an possibility to study the
Lorentz Invariance Violation by measuring the oscillation pattern of very high
energy neutrinos from a cosmological distance.Comment: 11 pages, 6 figure
Geometrodynamical Formulation of Two-Dimensional Dilaton Gravity
Two-dimensional matterless dilaton gravity with arbitrary dilatonic potential
can be discussed in a unitary way, both in the Lagrangian and canonical
frameworks, by introducing suitable field redefinitions. The new fields are
directly related to the original spacetime geometry and in the canonical
picture they generalize the well-known geometrodynamical variables used in the
discussion of the Schwarzschild black hole. So the model can be quantized using
the techniques developed for the latter case. The resulting quantum theory
exhibits the Birkhoff theorem at the quantum level.Comment: 15 pages, LATE
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The Texas Petawatt Laser And Current Experiments
The Texas Petawatt Laser is operational with experimental campaigns executed in both F/40 and F3 target chambers. Recent improvements have resulted in intensities of >2x10(21) W/cm(2) on target. Experimental highlights include, accelerated electron energies of >2 GeV, DD fusion ion temperatures >25 keV and isochorically heated solids to 10-50 eV.Physic
Probing non-unitary mixing and CP-violation at a Neutrino Factory
A low energy non-unitary leptonic mixing matrix is a generic feature of many
extensions of the Standard Model. In such a case, the task of future precision
neutrino oscillation experiments is more ambitious than measuring the three
mixing angles and the leptonic (Dirac) CP-phase, i.e., the accessible
parameters of a unitary leptonic mixing matrix. A non-unitary mixing matrix has
13 parameters that affect neutrino oscillations, out of which four are
CP-violating. In the scheme of Minimal Unitarity Violation (MUV) we analyse the
potential of a Neutrino Factory for determining or constraining the parameters
of the non-unitary leptonic mixing matrix, thereby testing the origin of
CP-violation in the lepton sector.Comment: 21 pages, 8 eps figures, REVTeX
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