Search results for "Jacob"
showing 10 items of 181 documents
Mappings of exponentially integrable distortion: Decay of the Jacobian
2018
We establish an integrability result on the reciprocal of the Jacobian determinant for a mapping of exponentially integrable distortion and thus answer a question raised by S. Hencl and P. Koskela.
Mappings of Finite Distortion:¶Discreteness and Openness
2001
We establish a sharp integrability condition on the partial derivatives of a mapping with L p -integrable distortion for some p>n− 1 to guarantee discreteness and openness. We also show that a mapping with exponentially integrable distortion and integrable Jacobian determinant is either constant or both discrete and open. We give an example demonstrating the preciseness of our criterion.
Measurement and storage of a network of jacobians as a method for the visual positioning of a robot arm
1996
The goal of this paper is to describe a method to position a robot arm at any visible point of a given workspace without an explicit on line use of the analytical form of the transformations between real space and camera coordinates (camera calibration) or between cartesian and joint coordinates (direct or inverse kinematics of the robot arm). The formulation uses a discrete network of points distributed all over the workspace in which a procedure is given to measure certain Jacobian matrices which represent a good local linear approximation to the unknown compound transformation between camera and joint coordinates. This approach is inspired by the biological observation of the vestibulo-o…
Lagrangian dynamics and possible isochronous behavior in several classes of non-linear second order oscillators via the use of Jacobi last multiplier
2015
Abstract In this paper, we employ the technique of Jacobi Last Multiplier (JLM) to derive Lagrangians for several important and topical classes of non-linear second-order oscillators, including systems with variable and parametric dissipation, a generalized anharmonic oscillator, and a generalized Lane–Emden equation. For several of these systems, it is very difficult to obtain the Lagrangians directly, i.e., by solving the inverse problem of matching the Euler–Lagrange equations to the actual oscillator equation. In order to facilitate the derivation of exact solutions, and also investigate possible isochronous behavior in the analyzed systems, we next invoke some recent theoretical result…
‘Jacob Ryman’
1995
Jacob Ryman
Approximate Bodies. Gender and Power in Early Modern Drama and Anatomy
2005
The early modern period was an age of anatomical exploration and revelation, with new discoveries capturing the imagination not only of scientists but also of playwrights and poets. Approximate Bodies examines the changing representation of the body in early modern drama and in the period’s anatomical and gynaecological treatises. The book traces a number of emblematic figurations of the body, which it sees as dramatized and rearticulated in the period’s texts: the eroticized, deformed body of the outsider, for example, or the effeminate body of the desiring male and the disfigured body parts of the desiring female. Drawing on the theories of Foucault, Derrida and Lacan and working through …
Simple Facts Concerning Nambu Algebras
1998
A class of substitution equations arising in the extension of Jacobi identity for $n$-gebras is studied and solved. Graded bracket and cohomology adapted to the study of formal deformations are presented. New identities in the case of Nambu-Lie algebras are proved. The triviality in the Gerstenhaber sense of certain deformed n-skew-symmetric brackets, satisfying the Leibniz rule with respect to a star-product, is shown for n≥ 3.
Breakdown of separability due to confinement
2017
A simple system of two particles in a bidimensional configurational space S is studied. The possibility of breaking in S the time-independent Schrodinger equation of the system into two separated one-dimensional one-body Schrodinger equations is assumed. In this paper, we focus on how the latter property is countered by imposing such boundary conditions as confinement to a limited region of S and/or restrictions on the joint coordinate probability density stemming from the sign-invariance condition of the relative coordinate (an impenetrability condition). Our investigation demonstrates the reducibility of the problem under scrutiny into that of a single particle living in a limited domain …
Sobre la crítica hegeliana del criticismo
2000
El interés de Hegel por el giro llevado a cabo por Kant en la epistemología está motivado especialmente por las consecuencias negativas que tal giro ha tenido para la metafísica. En la medida en que un objetivo principal de Hegel es elevar la especulación al rango de ciencia o genuino saber, su proyecto filosófico implica una confrontación con el enfoque crítico de Kant. El objeto de este ensayo es examinar la naturaleza y alcance de tal confrontación, tratando de mostrar las consecuencias que ésta tiene para Hegel en lo que respecta, no sólo a la viabilidad de su propio programa especulativo, sino también a su valoración de la filosofía crítica.
The “Jacobsen Flap” Technique: A Safe, Simple Surgical Procedure to Treat Dupuytren Disease of the Little Finger in Advanced Stage
2010
The "Jacobsen flap" technique: a safe, simple surgical procedure to treat Dupuytren disease of the little finger in advanced stage. Tripoli M, Cordova A, Moschella F. Source Chirurgia Plastica e Ricostruttiva, Dipartimento di Discipline Chirurgiche ed Oncologiche, Università degli Studi di Palermo, Italy. matripoli@yahoo.it Abstract The surgery for advanced stages of Dupuytren disease of the little finger is controversial. In the literature, several techniques have been described with variable reported results and postoperative complications. Percutaneous needle fasciotomy, McCash technique, and dermofasciectomy are often performed for surgical treatment but they present significant complic…