We report on a 50 ksec XMM-Newton observation of the double pulsar system J0737–3039 performed on April 2004. We present results of the spectral analysis of these data combined with the much shorter Chandra pointing performed on January 2004. Black body emission with effective temperature of 0.20 −0.02 keV (90% confidence level) and emission radius 75 +30 −9 m for a distance of 0.5 kpc (implyin...

Analysis of ten years of high-precision timing data on the millisecond pulsar PSR J0437−4715 has resulted in a model-independent kinematic distance based on an apparent orbital period derivative, Ṗb, determined at the 1.5% level of precision (Dk = 157.0±2.4 pc), making it one of the most accurate stellar distance estimates published to date. The discrepancy between this measurement and a previo...

This contribution to the ongoing discussion of division algorithms for residue number systems (RNS) is based on Newton iteration for computing the reciprocal. An extended RNS with twice the number of moduli provides the range required for multiplication and scaling. Separation of the algorithm description from its RNS implementation achieves a high level of modularity, and makes the complexity ...

{ We describe a Newton method applied to the evaluation of a critical point of a total energy associated to a shape optimization problem. The key point of these methods is the Hessian of the shape functional. We give an expression of the Hessian as well as the relation with the second-order Eulerian semi-derivative. An application to the electromagnetic shaping of liquid metals process is studi...

An examination is made of the way in which particles emerge from linear, bosonic, massive quantum field theories. Two different constructions of the one-particle subspace of such theories are given, both illustrating the importance of the interplay between the quantummechanical linear structure and the classical one. Some comments are made on the Newton-Wigner representation of one-particle sta...

We propose a technique of multisensor signal reconstruction based on the assumption, that source signals are spatially sparse, as well as have sparse representation in a chosen dictionary in time domain. This leads to a large scale convex optimization problem, which involves combined l1-l2 norm minimization. The optimization is carried by the truncated Newton method, using preconditioned conjug...

A 360◦ panorama is generated from images freely taken by a hand-held camera: images are pasted together and mapped onto a cylindrical surface. First, the lack of orientation information is overcome by invoking “oriented projective geometry”. Then, the inconsistencies arising from a 360◦ rotation of the viewing direction are resolved by optimizing all the homographies between images simultaneous...

We propose a technique of multisensor signal reconstruction based on the assumption, that source signals are spatially sparse, as well as have sparse representation in a chosen dictionary in time domain. This leads to a large scale convex optimization problem, which involves combined l1-l2 norm minimization. The optimization is carried by the truncated Newton method, using preconditioned conjug...

In this article, we consider flat and curved Riemannian symmetric spaces in the complex case study their basic integral kernels, potential spherical analysis: heat, Newton, Poisson kernels functions, i.e., kernel of Fourier transform. We introduce exploit a simple new method construction these W-invariant by alternating sum formulas. then use representation to obtain asymptotic behavior. apply ...

A family of linear \Algebraic{Geometric" codes is constructed from line bundles on Schubert varieties and analyzed using techniques from Representation Theory. AMS(MOS) 1991 Subject Classi cation (Primary) 94B27 (Secondary) 14M99, 20G10. Research partially supported by the US Air Force O ce of Scienti c Research. Research partially supported by the Isaac Newton Institute for Mathematical Scienc...