Concept

Angles d'Euler

Publications associées (121)

Inverse lattice filtering of speech with adapted non-uniform delays

A particular form of constraint is incorporated to Linear Prediction lattice filter models in the form of unequal-length delays. This constraint amounts to reducing the number of intrinsic degrees of freedom defined by the reflection coefficients without m ...

2000

Position+Attitude from GPS+INS for RTK Airborne Sensoring

Phillip Tomé, Telmo Cunha

This is a presentation of the techniques used to process inertial and GPS data collected during an airborne gravimetric and altimetric survey in order to obtain absolute position and attitude estimates of the sensors mounted on board the aircraft. For high ...

1999

A GPS/INS System for Positioning and Orientation of Airborne Sensors: Results from flight tests in Portugal

Phillip Tomé, Telmo Cunha

Efficient systems for determining the precise position and orientation of airborne sensors will have a great impact in different remote sensing activities, with consequences in their productivity and therefore substantially increasing their cost effectiven ...

1999

On the INS and GPS Data Processing for Airborne Gravity Applications

Phillip Tomé, Telmo Cunha

Airborne gravimetric and altimetric measurements depend heavily on the determination of the instantaneous position and attitude of the aircraft. Here, a methodology to process raw inertial data together with GPS data collected from at least two antennas/re ...

1998

Intrinsic coordinate system for the tibial plateau

Dominique Pioletti, Lalaonirina Rakotomanana Ravelonarivo, Pierre-François Leyvraz

Determination of the sub-chondral bone density, or more precisely the internal density spot, can be used to evaluate the capability of a knee to sustain normal kinematics. To use this technique as a mean of knee kinematics control, the position of the inte ...

1998

Halftoning by rotating non-Bayer dispersed dither arrays

Roger Hersch

We propose a new operator for creating rotated dither threshold arrays. This new discrete one- to-one rotation operator is briefly explained. We analyze its application to different dispersed- dot dither arrays such as hexagonal dispersed dither arrays and ...

Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, USA1995

Startup Methods for Single-Mode Gyrotron Operation

Stefano Alberti, Minh Quang Tran, Trach-Minh Tran

Experimental start-up results of a 118 GHz TE(22,6) gyrotron are presented and compared with theory. The theoretical excitation regimes of competing modes are computed in the energy-velocity-pitch-angle plane. The start-up paths through the plane are deter ...

1995

3-DIMENSIONAL VARIABLE-ANGLE NUCLEAR-MAGNETIC-RESONANCE EXCHANGE SPECTROSCOPY WITHOUT ROTOR AXIS HOPPING

David Lyndon Emsley

Slow, large-amplitude chain motions play an important role in determining the macroscopic mechanical properties of polymers. Although such motions have been studied quantitatively by two-dimensional (2D) nuclear: magnetic resonance (NMR) exchange experimen ...

AMER INST PHYSICS1994

Mode Competition and Startup in Cylindrical Cavity Gyrotrons Using High-Order Operating Modes

Minh Quang Tran, Trach-Minh Tran

The problem of mode competition in cylindrical cavity gyrotrons is considered. The normalized variable equations are used to calculate the oscillation regions of possible operating modes in the energy-velocity-pitch-angle plane. The analysis is self-consis ...

1994

Optimization of shaped selective pulses for NMR using a quaternion description of their overall propagators

David Lyndon Emsley, Geoffrey Bodenhausen

New amplitude-modulated radio-frequency pulses are proposed that allow one to achieve selective excitation, de-excitation, inversion, and refocusing of spin-1/2 systems in NMR. The rotation angles and axes are well defined over a chosen bandwidth, regardle ...

1992

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