Search results for "TACL"
showing 10 items of 204 documents
Elastodynamic behavior of mechanical cloaks designed by direct lattice transformations
2020
International audience; <h2 class="section-title u-h3 u-margin-l-top u-margin-xs-bottom" style="box-sizing: border-box; padding: 0px; font-weight: 400 !important; color: #505050; font-size: 1.2rem !important; line-height: 1.333 !important; font-family: NexusSerif, Georgia, 'Times New Roman', Times, STIXGeneral, 'Cambria Math', 'Lucida Sans Unicode', 'Microsoft Sans Serif', 'Segoe UI Symbol', 'Arial Unicode MS', serif; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-styl…
Collision with and avoidance of obstacles by blind cave fish Anoptichthys jordani (Characidae).
1985
Blind Mexican cave fish (Anoptichthys jordani) were released into unknown surroundings and their swimming tracks were recorded. During the first 24 h in a new tank, i.e., in unfamiliar environments, the average swimming velocity of the fish was higher than during the remaining time in the tank. Collision with obstacles was recorded by an electrical contact detection method. Single frame analysis of video-recordings revealed that collision can be correlated with tail movements when the fish is close to an obstacle, whereas avoidance correlates with gliding during approach to an obstacle. These behavior patterns are discussed in the context of the flow field hypothesis and inhibition of the l…
Pointwise regularity of solutions to nonlinear double obstacle problems
1991
(Re)creating “society in silico” : surveillance capitalism, simulations and subjectivity in the Cambridge Analytica data scandal
2021
This article provides a different angle to understand the Cambridge Analytica (CA) data scandal. It focuses on the role of models and simulations in the big data campaigning tools CA allegedly used, and their epistemological and ontological potential to produce and reproduce voters' digital doubles that would first colonise and eventually replace the analogue selves they were related to. By integrating and revising Zuboff's surveillance capitalism framework with Debord's classic theory of the Spectacle, the article argues that the dystopian simulations played as real life experiments by surveillance capitalist firms such as CA have the ultimate goal of replacing analogue humanity with digit…
OBSTACLE PROBLEMS FOR DEGENERATE ELLIPTIC EQUATIONS WITH NONHOMOGENEOUS NONLINEAR BOUNDARY CONDITIONS
2008
In this paper we study the questions of existence and uniqueness of solutions for equations of type - div a(x,Du) + γ(u) ∋ ϕ, posed in an open bounded subset Ω of ℝN, with nonlinear boundary conditions of the form a(x,Du) · η + β(u) ∋ ψ. The nonlinear elliptic operator div a(x,Du) modeled on the p-Laplacian operator Δp(u) = div (|Du|p-2Du), with p > 1, γ and β maximal monotone graphs in ℝ2 such that 0 ∈ γ(0) ∩ β(0), [Formula: see text] and the data ϕ ∈ L1(Ω) and ψ ∈ L1(∂ Ω). Since D(γ) ≠ ℝ, we are dealing with obstacle problems. For this kind of problems the existence of weak solution, in the usual sense, fails to be true for nonhomogeneous boundary conditions, so a new concept of solut…
Nonlinear balayage on metric spaces
2009
We develop a theory of balayage on complete doubling metric measure spaces supporting a Poincaré inequality. In particular, we are interested in continuity and p-harmonicity of the balayage. We also study connections to the obstacle problem. As applications, we characterize regular boundary points and polar sets in terms of balayage. Original Publication:Anders Björn, Jana Björn, Tero Mäkäläinen and Mikko Parviainen, Nonlinear balayage on metric spaces, 2009, Nonlinear Analysis, (71), 5-6, 2153-2171.http://dx.doi.org/10.1016/j.na.2009.01.051Copyright: Elsevier Science B.V., Amsterdam.http://www.elsevier.com/
A brief overview on the numerical behavior of an implicit meshless method and an outlook to future challenges
2015
In this paper recent results on a leapfrog ADI meshless formulation are reported and some future challenges are addressed. The method benefits from the elimination of the meshing task from the pre-processing stage in space and it is unconditionally stable in time. Further improvements come from the ease of implementation, which makes computer codes very flexible in contrast to mesh based solver ones. The method requires only nodes at scattered locations and a function and its derivatives are approximated by means of a kernel representation. A perceived obstacle in the implicit formulation is in the second order differentiations which sometimes are eccesively sensitive to the node configurat…
Los medios masivos de comunicación y el terrorismo: entre la verdad y el miedo
2017
Los medios masivos de comunicación cumplen un rol importante en la sociedad, son una suerte de reforzadores morales que problematizan y ofrecen soluciones a las cuestiones importantes de la sociedad. No obstante, en la sociedad de consumo, somos testigos de un cambio sustancial en el rol de los medios quienes han pasado a ser productores del “espectáculo del desastre”. El 11 de septiembre ha marcado a fuego no solo el poder de los medios para distorsionar ciertas realidades a sus audiencias, sino para cubrir la noticia escondiendo las causas reales que fomentan el terrorismo. El presente ensayo intenta situarse como una critica constructiva al discurso periodístico y de los medios dominante…
En una galaxia muy, muy lejana… Espectáculos romanos en el universo StarWars
2020
Todo el mundo reconoce en la carrera de vainas de Star Wars Episodio I: la amenaza fantasma la competición de cuadrigas de la famosísima secuencia del film Ben-Hur de 1959, pero este no es el único espectáculo romano que aparece en las dos primeras trilogías: una pompa, una damnatio ad bestias y una venatio están también presentes en las películas de George Lucas. ¿Se basan estas escenas de la película en documentación histórica? ¿En historiografía sobre el tema? ¿En literatura? ¿En otras películas? creemos interesante hacer un pequeño análisis de todos ellos y con este trabajo intentaremos dar respuesta a estas preguntas.
On the design of the optimal covering of an obstacle
2006
We consider the problem of controlling the shape of the coincidence set in an obstacle problem. This so called packaging problem was introduced in