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pro vyhledávání: '"IOFFE, ALEXANDER"'
A novel cold neutron source (CNS) employing chessboard or staircase assemblies of high-aspect ratio rectangular (HARR) para-hydrogen (p-H2) moderators is proposed. It is demonstrated that this design can generate neutron beams with higher intensity a
Externí odkaz:
http://arxiv.org/abs/2311.15389
Autor:
Konik, Petr, Ioffe, Alexander
Simple and fast analytic method to find out optimal combinations of sizes of neutron moderator and optical system entrance, allowing for the full sample illumination with minimum to none background, is developed. In the case of employing low-dimensio
Externí odkaz:
http://arxiv.org/abs/2302.00581
Nonsmooth optimization using Taylor-like models: error bounds, convergence, and termination criteria
We consider optimization algorithms that successively minimize simple Taylor-like models of the objective function. Methods of Gauss-Newton type for minimizing the composition of a convex function and a smooth map are common examples. Our main result
Externí odkaz:
http://arxiv.org/abs/1610.03446
Autor:
Ioffe, Alexander D.
The regularity theory for variational inequalities over polyhedral sets developed in a series of papers by Robinson, Ralph and Dontchev-Rockafellar in the 90s has long become classics of variational analysis. But in the available proofs of almost all
Externí odkaz:
http://arxiv.org/abs/1508.06607
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Using a geometric argument, we show that under a reasonable continuity condition, the Clarke subdifferential of a semi-algebraic (or more generally stratifiable) directionally Lipschitzian function admits a simple form: the normal cone to the domain
Externí odkaz:
http://arxiv.org/abs/1211.3615
Incoherent background can create an intrinsic problem for standard small angle neutron scattering measurements. Biological samples contain hydrogen which is a strong incoherent scatterer thus creating an intrinsic source of background that makes dete
Externí odkaz:
http://arxiv.org/abs/1201.5242
We present a finite element calculation of the magnetic field (MagNet software) taken with the newly proposed PASTIS Coil, which uses a wide-angle banana shaped 3He Neuton Spin Filter cell (NSF) to cover a large range of scattering angle. The goal of
Externí odkaz:
http://arxiv.org/abs/1201.5208
Examples exist of extended-real-valued closed functions on ${\bf R}^n$ whose subdifferentials (in the standard, limiting sense) have large graphs. By contrast, if such a function is semi-algebraic, then its subdifferential graph must have everywhere
Externí odkaz:
http://arxiv.org/abs/1102.4050