Search results for " 14"

Latvijas Vēstures Institūta Žurnāls. 2013, Nr. 1 (86)

2013

Ofrenda de los antiguos Amigos en su IV centenario

Notes on the historical vocabulary of neuroanatomy

1995

Rietumu kristīgās sabiedrības 14.gadsimta krīze Livonijā?

2011

Elektroniskā versija nesatur pielikumus

An optical classification tool for global lake waters

2017

Shallow and deep lakes receive and recycle organic and inorganic substances from within the confines of these lakes, their watershed and beyond. Hence, a large range in absorption and scattering and extreme differences in optical variability can be found between and within global lakes. This poses a challenge for atmospheric correction and bio-optical algorithms applied to optical remote sensing for water quality monitoring applications. To optimize these applications for the wide variety of lake optical conditions, we adapted a spectral classification scheme based on the concept of optical water types. The optical water types were defined through a cluster analysis of in situ hyperspectral…

Mujeres e Ilustración: una perspectiva europea

2008

Este artículo sitúa la relación entre mujeres e Ilustración en España dentro de su contexto internacional, desde un tripe enfoque: en primer lugar, situando la trayectoria de los estudios en el marco de la historiografía europea y norteamericana; en segundo lugar, señalando las conexiones entre los debates acerca de la naturaleza y funciones de los sexos dentro y fuera de nuestras fronteras (a través de traducciones, citas e influencias mutuas) y, por último, revisando cómo para ls gentes de la época las relaciones entre hombres y mujeres constituyeron un elemento clave a la hora de valorar las diferencias nacionales y el grado de civilización alcanzado por una sociedad. En este sentido, se…

OPTIMIZATIONS FOR TENSORIAL BERNSTEIN–BASED SOLVERS BY USING POLYHEDRAL BOUNDS

2010

The tensorial Bernstein basis for multivariate polynomials in n variables has a number 3n of functions for degree 2. Consequently, computing the representation of a multivariate polynomial in the tensorial Bernstein basis is an exponential time algorithm, which makes tensorial Bernstein-based solvers impractical for systems with more than n = 6 or 7 variables. This article describes a polytope (Bernstein polytope) with a number of faces, which allows to bound a sparse, multivariate polynomial expressed in the canonical basis by solving several linear programming problems. We compare the performance of a subdivision solver using domain reductions by linear programming with a solver using a c…

Surfaces of minimal degree of tame representation type and mutations of Cohen–Macaulay modules

2017

We provide two examples of smooth projective surfaces of tame CM type, by showing that any parameter space of isomorphism classes of indecomposable ACM bundles with fixed rank and determinant on a rational quartic scroll in projective 5-space is either a single point or a projective line. For surfaces of minimal degree and wild CM type, we classify rigid Ulrich bundles as Fibonacci extensions. For the rational normal scrolls S(2,3) and S(3,3), a complete classification of rigid ACM bundles is given in terms of the action of the braid group in three strands.

Torsion of a finite base locus

2018

We interpret geometrically the torsion of the symmetric algebra of the ideal sheaf of a zero-dimensional scheme Z defined by $n+1$ equations in an $n$-dimensional variety. This leads us to generalise a formula of A.Dimca and S.Papadima in positive characteristic for a rational transformation with finite base locus. Among other applications, we construct an explicit example of a homaloidal curve of degree $5$ in characteristic $3$, answering negatively a question of A.V.D\'oria, S.H.Hassanzadeh and A.Simis.

Algebraic-geometric techniques for the feedback classification and robustness of the optimal control of a pair of Bloch equations with application to…

2017

The aim of this article is to classify the singular trajectories associated with the optimal control problems of a pair of controlled Bloch equations. The motivation is to analyze the robustness of the optimal solutions to the contrast and the time-minimal saturation problem, in magnetic resonance imaging, with respect to the parameters and B1-inhomogeneity. For this purpose, we use various computer algebra algorithms and methods to study solutions of polynomial systems of equations and inequalities which are used for classification issues: Gröbner basis, cylindrical algebraic decomposition of semi-algebraic sets, Thom's isotopy lemma.