770 research outputs found
An Application of Reversible Entropic Dynamics on Curved Statistical Manifolds
Entropic Dynamics (ED) is a theoretical framework developed to investigate
the possibility that laws of physics reflect laws of inference rather than laws
of nature. In this work, a RED (Reversible Entropic Dynamics) model is
considered. The geometric structure underlying the curved statistical manifold,
M is studied. The trajectories of this particular model are hyperbolic curves
(geodesics) on M. Finally, some analysis concerning the stability of these
geodesics on M is carried out.Comment: Presented at MaxEnt 2006, the 26th International Workshop on Bayesian
Inference and Maximum Entropy Methods (July 8-13, 2006, Paris, France). This
paper is slightly updated from the published version. This paper consists of
9 pages with 1 figure. Keywords: Inductive inference, information geometry,
statistical manifolds, relative entrop
Mass spectrometer with magnetic pole pieces providing the magnetic fields for both the magnetic sector and an ion-type vacuum pump
A mass spectrometer (MS) with unique magnetic pole pieces which provide a homogenous magnetic field across the gap of the MS magnetic sector as well as the magnetic field across an ion-type vacuum pump is disclosed. The pole pieces form the top and bottom sides of a housing. The housing is positioned so that portions of the pole pieces form part of the magnetic sector with the space between them defining the gap region of the magnetic sector, through which an ion beam passes. The pole pieces extend beyond the magnetic sector with the space between them being large enough to accommodate the electrical parts of an ion-type vacuum pump. The pole pieces which provide the magnetic field for the pump, together with the housing form the vacuum pump enclosure or housing
Quiet Clean Short-haul Experimental Engine (QCSEE). Aerodynamic and aeromechanical performance of a 50.8 cm (20 inch) diameter 1.34 PR variable pitch fan with core flow
The fan aerodynamic and aeromechanical performance tests of the quiet clean short haul experimental engine under the wing fan and inlet with a simulated core flow are described. Overall forward mode fan performance is presented at each rotor pitch angle setting with conventional flow pressure ratio efficiency fan maps, distinguishing the performance characteristics of the fan bypass and fan core regions. Effects of off design bypass ratio, hybrid inlet geometry, and tip radial inlet distortion on fan performance are determined. The nonaxisymmetric bypass OGV and pylon configuration is assessed relative to both total pressure loss and induced circumferential flow distortion. Reverse mode performance, obtained by resetting the rotor blades through both the stall pitch and flat pitch directions, is discussed in terms of the conventional flow pressure ratio relationship and its implications upon achievable reverse thrust. Core performance in reverse mode operation is presented in terms of overall recovery levels and radial profiles existing at the simulated core inlet plane. Observations of the starting phenomena associated with the initiation of stable rotor flow during acceleration in the reverse mode are briefly discussed. Aeromechanical response characteristics of the fan blades are presented as a separate appendix, along with a description of the vehicle instrumentation and method of data reduction
Automated mass spectrometer/analysis system: A concept
System performs rapid multiple analyses of entire compound classes or individual compounds on small amounts of sample and reagent. Method will allow screening of large populations for metabolic disorders and establishment of effective-but-safe levels of therapeutic drugs in body fluids and tissues
Complexity Characterization in a Probabilistic Approach to Dynamical Systems Through Information Geometry and Inductive Inference
Information geometric techniques and inductive inference methods hold great
promise for solving computational problems of interest in classical and quantum
physics, especially with regard to complexity characterization of dynamical
systems in terms of their probabilistic description on curved statistical
manifolds. In this article, we investigate the possibility of describing the
macroscopic behavior of complex systems in terms of the underlying statistical
structure of their microscopic degrees of freedom by use of statistical
inductive inference and information geometry. We review the Maximum Relative
Entropy (MrE) formalism and the theoretical structure of the information
geometrodynamical approach to chaos (IGAC) on statistical manifolds. Special
focus is devoted to the description of the roles played by the sectional
curvature, the Jacobi field intensity and the information geometrodynamical
entropy (IGE). These quantities serve as powerful information geometric
complexity measures of information-constrained dynamics associated with
arbitrary chaotic and regular systems defined on the statistical manifold.
Finally, the application of such information geometric techniques to several
theoretical models are presented.Comment: 29 page
On a Differential Geometric Viewpoint of Jaynes' Maxent Method and its Quantum Extension
We present a differential geometric viewpoint of the quantum MaxEnt estimate
of a density operator when only incomplete knowledge encoded in the expectation
values of a set of quantum observables is available. Finally, the additional
possibility of considering some prior bias towards a certain density operator
(the prior) is taken into account and the unsolved issues with its quantum
relative entropic inference criterion are pointed out.Comment: 6 pages and 0 figures. Accepted contribution to MaxEnt 2011, the 31st
International Workshop on Bayesian Inference and Maximum Entropy Methods in
Science and Engineering; 10-15 July, Waterloo (CANADA
Electrochromic Polymer Ink Derived from a Sidechain-Modified EDOT for Electrochromic Devices with Colorless Bright State
AbstractPrintable organic electrochromic materials are the key component of flexible low power and low weight displays and dynamic shading systems. A vast number of more or less wellâperforming materials is reported in the literature, but only a very limited number of them have been tested in an industriallyârelevant environment so far. Upscaling requires simplicity of synthesis, overall sustainability, low cost and compatibility with simple and high throughput wetâchemical deposition techniques, such as slotâdie coating or inkjet printing. In the present paper, an original process is described that enables the controlled oxidative polymerization of a water insoluble, functionalized 3,4âethylene dioxythiophene (EDOT) derivative. This process leads to the formation of an ink that consists solely of active polymeric material (no dispersing agents) and has suitable rheological properties for use in rollâtoâroll slotâdie coating or inkâjet printing. The straightforward deposition, followed by a simple thermal treatment, directly yields stable and homogeneous thin films with stateâofâtheâart electrochromic performance
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