5,709 research outputs found
Miniaturized haploscope for testing binocular vision
Device can reproduce virtually all binocular stimulus conditions (target configuration, vergence angle, and accommodative distance) used to test binocular performance. All subsystems of electronic controls are open-loop and solid-state-controlled and, with the exception of vergence angle drive, utilize dc stepping motors as prime movers. Arrangement is also made for readouts of each variable
Comparison of clinical signs and outcomes between dogs with presumptive ischemic myelopathy and dogs with acute non compressive nucleus pulposus extrusion
Cost-Effectiveness of Targeted Reemployment Bonuses
Targeting reemployment bonus offers to unemployment insurance (UI) claimants identified as most likely to exhaust benefits is estimated to reduce benefit payments. While earlier research indicated that non-targeted reemployment bonus offers would not be good public policy, in this paper we show that targeting bonus offers with profiling models similar to those in state Worker Profiling and Reemployment Services (WPRS) systems can improve their cost effectiveness. Since estimated average benefit payments do not steadily decline as the eligibility screen is gradually tightened, we find that narrow targeting is not optimal. The best candidate to emerge for a targeted reemployment bonus is a low bonus amount with a long qualification period, targeted to the half of profiled claimants most likely to exhaust their UI benefit entitlement.reemployment, bonus, UI, personal, accounts, PRA, unemployment, insurance, Upjohn, Institute, O'Leary, Decker, Wandner
Effective Governance of Global Financial Markets:An Evolutionary Plan for Reform
Runaway electrons, which are generated in a plasma where the induced electric field exceeds a certain critical value, can reach very high energies in the MeV range. For such energetic electrons, radiative losses will contribute significantly to the momentum space dynamics. Under certain conditions, due to radiative momentum losses, a non-monotonic feature - a âbump' - can form in the runaway electron tail, creating a potential for bump-on-tail-type instabilities to arise. Here, we study the conditions for the existence of the bump. We derive an analytical threshold condition for bump appearance and give an approximate expression for the minimum energy at which the bump can appear. Numerical calculations are performed to support the analytical derivation
A mathematical model of a single main rotor helicopter for piloted simulation
A mathematical model, suitable for piloted simulation of the flying qualities of helicopters, is a nonlinear, total force and moment model of a single main rotor helicopter. The model has ten degrees of freedom: six rigid body, three rotor flapping, and the rotor rotational degrees of freedom. The rotor model assumes rigid blades with rotor forces and moments radially integrated and summed about the azimuth. The fuselage aerodynamic model uses a detailed representation over a nominal angle of attack and sideslip range of + or - 15 deg., as well as a simplified curve fit at large angles of attack or sideslip. Stabilizing surface aerodynamics are modeled with a lift curve slope between stall limits and a general curve fit for large angles of attack. A generalized stability and control augmentation system is described. Additional computer subroutines provide options for a simplified engine/governor model, atmospheric turbulence, and a linearized six degree of freedom dynamic model for stability and control analysis
Hadron structure in tau -> KKpi nu_tau decays
We analyse the hadronization structure of both vector and axial-vector
currents leading to tau -> KKpi nu_tau decays. At leading order in the 1/Nc
expansion, and considering only the contribution of the lightest resonances, we
work out, within the framework of the resonance chiral Lagrangian, the
structure of the local vertices involved in those processes. The couplings in
the resonance theory are constrained by imposing the asymptotic behaviour of
vector and axial-vector spectral functions ruled by QCD. In this way we predict
the hadron spectra and conclude that, contrarily to previous assertions, the
vector contribution dominates by far over the axial-vector one in all KKpi
charge channels.Comment: 32 pages, 7 figure
Perturbation analysis of trapped-particle dynamics in axisymmetric dipole geometry
The perturbation analysis of the bounce action-angle coordinates
for charged particles trapped in an axisymmetric dipole magnetic field is
presented. First, the lowest-order bounce action-angle coordinates are derived
for deeply-trapped particles in the harmonic-oscillator approximation. Next,
the Lie-transform perturbation method is used to derive higher-order anharmonic
action-angle corrections. Explicit expressions (with anharmonic corrections)
for the canonical parallel coordinates and are
presented, which satisfy the canonical identity . Lastly, analytical expressions for the bounce and drift frequencies
(which include anharmonic corrections) yield excellent agreement with exact
numerical results.Comment: 16 pages, 3 figure
The Mark 3 Haploscope
A computer-operated binocular vision testing device was developed as one part of a system designed for NASA to evaluate the visual function of astronauts during spaceflight. This particular device, called the Mark 3 Haploscope, employs semi-automated psychophysical test procedures to measure visual acuity, stereopsis, phoria, fixation disparity, refractive state and accommodation/convergence relationships. Test procedures are self-administered and can be used repeatedly without subject memorization. The Haploscope was designed as one module of the complete NASA Vision Testing System. However, it is capable of stand-alone operation. Moreover, the compactness and portability of the Haploscope make possible its use in a broad variety of testing environments
Answers that Have Integrity
[EN] Answers to queries in possibly inconsistent databases may
not have integrity. We formalize âhas integrityâ on the basis of a definition
of âcausesâ. A cause of an answer is a minimal excerpt of the database
that explains why the answer has been given. An answer has integrity if
one of its causes does not overlap with any cause of integrity violation.Supported by FEDER and the Spanish grants TIN2009-14460-C03, TIN2010-17139.Decker, H. (2011). Answers that Have Integrity. Lecture Notes in Computer Science. 6834:54-72. https://doi.org/10.1007/978-3-642-23441-5S5472683
Successful medical management of a domestic longhair cat with subdural intracranial empyema and multifocal pneumonia
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