Search results for "Operator"
showing 10 items of 1427 documents
Suture intradermiche totali
2010
Two kind of total intradermal suture techniques are described in the present report. These procedures allow an effective reduction of post-operative pain of surgical wound, prevent infections, cut down tissutal trauma, achieve better aesthetic results, making easier postoperative patient''s management. From January 2001 to December 2007, 1,427 patients underwent surgical treatment and the wounds have been sewn with self-locking knots or intradermal skin closure with introflecting knots. This kind of procedures allow a sharp reduction of postoperative pain as well as the incidence of wound infections. Also the number of wound medication required after surgery is significantly reduced.
Ileostomía virtual como alternativa al estoma de protección en el cáncer de ovario avanzado. Ileostomía sistemática o selectiva. Papel de la endoscop…
2020
Entre todos los cánceres del tracto genital femenino, el cáncer de ovario es el segundo en orden de frecuencia y el de mayor mortalidad. En España se diagnostican unos 3.300 casos nuevos anuales, lo que representa el 5% de los canceres entre las mujeres. La incidencia en nuestro país es de aproximadamente 9 nuevos casos / 100.000 habitantes/año. La tasa de mortalidad es de 4 muertes /100.000 habitantes/año. En el momento del diagnóstico, el 75% de las pacientes están en un estadio avanzado de la enfermedad (III o IV). Las cifras de supervivencia disminuyen drásticamente entre los estadio I al IV. La exenteración pélvica posterior modificada es un procedimiento que se realiza con frecuencia …
Unique continuation results for certain generalized ray transforms of symmetric tensor fields
2022
Let $I_{m}$ denote the Euclidean ray transform acting on compactly supported symmetric $m$-tensor field distributions $f$, and $I_{m}^{*}$ be its formal $L^2$ adjoint. We study a unique continuation result for the normal operator $N_{m}=I_{m}^{*}I_{m}$. More precisely, we show that if $N_{m}$ vanishes to infinite order at a point $x_0$ and if the Saint-Venant operator $W$ acting on $f$ vanishes on an open set containing $x_0$, then $f$ is a potential tensor field. This generalizes two recent works of Ilmavirta and M\"onkk\"onen who proved such unique continuation results for the ray transform of functions and vector fields/1-forms. One of the main contributions of this work is identifying t…
Multi-parameter analysis of the obstacle scattering problem
2022
Abstract We consider the acoustic field scattered by a bounded impenetrable obstacle and we study its dependence upon a certain set of parameters. As usual, the problem is modeled by an exterior Dirichlet problem for the Helmholtz equation Δu + k 2 u = 0. We show that the solution u and its far field pattern u ∞ depend real analytically on the shape of the obstacle, the wave number k, and the Dirichlet datum. We also prove a similar result for the corresponding Dirichlet-to-Neumann map.
Quantitative Runge Approximation and Inverse Problems
2017
In this short note we provide a quantitative version of the classical Runge approximation property for second order elliptic operators. This relies on quantitative unique continuation results and duality arguments. We show that these estimates are essentially optimal. As a model application we provide a new proof of the result from \cite{F07}, \cite{AK12} on stability for the Calder\'on problem with local data.
A sharp estimate for Neumann eigenvalues of the Laplace-Beltrami operator for domains in a hemisphere
2018
Here, we prove an isoperimetric inequality for the harmonic mean of the first [Formula: see text] non-trivial Neumann eigenvalues of the Laplace–Beltrami operator for domains contained in a hemisphere of [Formula: see text].
Aspects regarding the existence of fixed points of the iterates of Stancu operators
2019
In the papers Iterates of Stancu Operators, via Contraction Principle (2002), respectively Iterates of Bernstein Operators, via Contraction Principle (2004), author I. A. Rus studied the existence of fixed points for Stancu operators Pn,α,β and Bernstein operators Bn. The aim of this paper is to find conditions for which the Stancu operators Pn,α,β are contractions on the graph, in order to demonstrate that the contraction principle can be applied for the study of the existence of fixed points for iterates of Stancu operators. The method used for this paper is the spectral method, which was also used in the paper Over-iterates of Bernstein-Stancu operators (2007), authors Gonska, Piţul and …
Atbildība par videi nodarīto kaitējumu neatkarīgi no vainas.
2019
Eiropas Parlamenta un Padomes direktīvā 2004/35/EK (2004.gada 21.aprīlis) par atbildību vides jomā attiecībā uz videi nodarītā kaitējuma novēršanu un atlīdzināšanu un Vides aizsardzības likumā regulētais stingrās atbildības institūts paredz operatora atbildību neatkarīgi no vainas par videi nodarīto kaitējumu vai tiešiem kaitējuma draudiem, kas ir radušies, veicot noteiktas profesionālās darbības. Maģistra darba mērķis ir veikt Vides aizsardzības likumā ietvertās stingrās atbildības regulējuma analīzi, pētot gan stingro atbildību ierobežojošos faktorus – dabas resursus, kuriem var tikt nodarīts kaitējums, profesionālās darbības un kaitējuma būtiskumu –, gan videi nodarītā kaitējuma novēršan…
Use of low dose of rFVIIa (recombinant Factor VII activated) to control late bleeding after percutaneous dilational tracheostomy
2019
Key Clinical Message In our case, the use of a low intravenous bolus dose of rFVIIa (recombinant factor VII activated; 15‐20 mcg/kg) was effective and uneventful in controlling late postprocedural PDT bleeding associated with thrombocytopenia that cannot be corrected and after all other treatments failed.
Local regularity estimates for general discrete dynamic programming equations
2022
We obtain an analytic proof for asymptotic H\"older estimate and Harnack's inequality for solutions to a discrete dynamic programming equation. The results also generalize to functions satisfying Pucci-type inequalities for discrete extremal operators. Thus the results cover a quite general class of equations.