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For a Theatrical Genetics: assumptions and challenges  [cached]
Almuth Grésillon,Marie-Madeleine Mervant-Roux,Dominique Budor
Revista Brasileira de Estudos da Presen?a , 2013,
Abstract: Is it possible to apply to theatre the genetic method, known and used in the field of literature? A theatrical work is a heterogeneous set of textual and scenic data, an ephemeral and fleeting entity, because every staging – but also every presentation – necessarily produces new modifications: text cuts; variations in body movements; different voice timbres; lighting; the pace of the event, etc. In these conditions, how is it possible to retrace the genesis of the work, among objects of several kinds and with multiple finishes?
Laboratory experiments and simulations on jets  [PDF]
Martín Huarte-Espinosa,Adam Frank,Eric Blackman
Physics , 2011,
Abstract: Astrophysical jets have been studied with observations, theoretical models and numerical simulations for decades. Recently, supersonic magnetized jets have been formed in laboratory experiments of high-energy density plasmas. I will review these studies and discuss the experimental setup that has been used to form millimeter-scale jets driven by strong toroidal magnetic fields in a MAGPIE generator. The physical conditions of these experiments are such that they can be scaled to astrophysical scenarios. These laboratory jets provide insights on the underlying physics of magnetic tower jets and help constrain some models of astrophysical jets. In this context, we also discuss the connection between the laboratory jets and recent 3D-MHD numerical simulations of Poynting flux dominated jets. The simulations allow us to investigate the effects of thermal energy losses and base rotation on the growth rate of kink mode perturbations, and to compare the evolution of PFD jets with a hydrodynamic counterpart of the same energy flux.
Experiments on Radioactivity in a Virtual Laboratory  [PDF]
Amelia Carolina Sparavigna
Physics , 2011,
Abstract: This paper shows how to run some experiments of physics, using a virtual laboratory. Such a laboratory is a website, equipped with objects to be measured and measuring instruments, simulated by means of Java Applets. Here we discuss in particular the case of a laboratory in which we can perform, on the Web, some experiments on radioactivity. The proposed virtual environment can be a viable alternative in the case of unavailability of a real laboratory.
Loop current dynamics in laboratory experiments
Bulgakov,Sergei N; Meulenert Pe?a,ángel R;
Interciencia , 2003,
Abstract: two aspects of the loop current (lc) dynamics in the gulf of mexico were studied in a series of laboratory tests: 1) the variation of its penetration distance into the gulf, and 2) the process of ring detachment by this current. the experiments were conducted in a square tank with a scaled coastal geometry of the gulf. a flow field was generated by pumping waters of different densities into the caribbean sea through the two major channels of the greater and lesser antilles. the flow characteristics depend upon the horizontal and vertical scales of the basin, influx, density differences, and rate of rotation. they can be classified according to the dimensionless parameters of reynolds (re) and burger (bu). the results of the flat bottom barotropic/baroclinic experiments with constant flux demonstrate that the major phenomena of the lc dynamics can be reproduced in a laboratory. we find that the penetration distance of the lc is governed by the reynolds number, which is the ratio of the inertial force to the frictional force, while eddy shedding occurs for a burger number less than unity (bu<1).
Remote Experiments in Control Engineering Education Laboratory  [cached]
Milica B Naumovi?,Dragan ?ivanovi?
International Journal of Online Engineering (iJOE) , 2008, DOI: 10.3991/ijoe.v4i2.447
Abstract: This paper presents Automatic Control Engineering Laboratory (ACEL) - WebLab, an under-developed, internet-based remote laboratory for control engineering education at the Faculty of Electronic Engineering in Ni . Up to now, the remote laboratory integrates two physical systems (velocity servo system and magnetic levitation system) and enables some levels of measurement and control. To perform experiments in ACEL-WebLab, the "LabVIEW Run Time Engine"and a standard web browser are needed.
Symmetron dark energy in laboratory experiments  [PDF]
Amol Upadhye
Physics , 2012, DOI: 10.1103/PhysRevLett.110.031301
Abstract: The symmetron scalar field is a matter-coupled dark energy candidate which effectively decouples from matter in high-density regions through a symmetry restoration. We consider a previously unexplored regime, in which the vacuum mass $\mu \sim 2.4\times 10^{-3}$ eV of the symmetron is near the dark energy scale, and the matter coupling parameter $M \sim 1$ TeV is just beyond Standard Model energies. Such a field will give rise to a fifth force at submillimeter distances which can be probed by short-range gravity experiments. We show that a torsion pendulum experiment such as E\"ot-Wash can exclude symmetrons in this regime for all self-couplings $\lambda \lesssim 7.5$.
Using data assimilation in laboratory experiments of geophysical flows  [PDF]
Martin Galmiche,Joel Sommeria,Emmanuelle Thivolle-Cazat,Jacques Verron
Physics , 2003,
Abstract: Data assimilation is used in numerical simulations of laboratory experiments in a stratified, rotating fluid. The experiments are performed on the large Coriolis turntable (Grenoble, France), which achieves a high degree of similarity with the ocean, and the simulations are performed with a two-layer shallow water model. Since the flow is measured with a high level of precision and resolution, a detailed analysis of a forecasting system is feasible. Such a task is much more difficult to undertake at the oceanic scale because of the paucity of observations and problems of accuracy and data sampling. This opens the way to an experimental test bed for operational oceanography. To illustrate this, some results on the baroclinic instability of a two-layer vortex are presented.
Self-oscillations in rocks,results of laboratory experiments  [cached]
A. N. Kamshilin,E. N. Volkova,O. R. Kuzichkin,M. A. Sokolnikov
Annals of Geophysics , 2004, DOI: 10.4401/ag-3262
Abstract: The method of generation of self-oscillations in rocks is developed here. Self-oscillations arise as a result of direct and inverse mechanoelectric transformations without an external generator. Laboratory experiments were executed with different samples. A relation between self-oscillation parameters from samples humidity and direct electrical field applied to samples was detected.
Turbulent thermal diffusion of aerosols in geophysics and in laboratory experiments
A. Eidelman, T. Elperin, N. Kleeorin, A. Krein, I. Rogachevskii, J. Buchholz,G. Grünefeld
Nonlinear Processes in Geophysics (NPG) , 2004,
Abstract: We discuss a new phenomenon of turbulent thermal diffusion associated with turbulent transport of aerosols in the atmosphere and in laboratory experiments. The essence of this phenomenon is the appearance of a nondiffusive mean flux of particles in the direction of the mean heat flux, which results in the formation of large-scale inhomogeneities in the spatial distribution of aerosols that accumulate in regions of minimum mean temperature of the surrounding fluid. This effect of turbulent thermal diffusion was detected experimentally. In experiments turbulence was generated by two oscillating grids in two directions of the imposed vertical mean temperature gradient. We used Particle Image Velocimetry to determine the turbulent velocity field, and an Image Processing Technique based on an analysis of the intensity of Mie scattering to determine the spatial distribution of aerosols. Analysis of the intensity of laser light Mie scattering by aerosols showed that aerosols accumulate in the vicinity of the minimum mean temperature due to the effect of turbulent thermal diffusion.
ASTROPHYSICAL JETS AS HYPERSONIC BUCKSHOT: LABORATORY EXPERIMENTS AND SIMULATIONS  [cached]
A. Frank,A. Ciardi,K. Yirak,S. Lebedev
Revista mexicana de astronomía y astrofísica , 2009,
Abstract: Herbig-Haro (HH) jets are commonly thought of as homogeneous beams of plasma traveling at hypersonic velocities. Structure within jet beams is often attributed to periodic or "pulsed" variations of conditions at the jet source. In this contribution we offer an alternative to "pulsed" models of protostellar jets. Using direct numerical simulations and laboratory experiments we explore the possibility that jets are chains of sub-radial clumps propagating through a moving inter-clump medium. Our simulations explore an idealization of this scenario by injecting small (r < rjet), dense ( > jet) spheres embedded in an otherwise smooth inter-clump jet flow. The spheres are initialized with velocities differing from the jet velocity by 15%. We find the consequences of shifting from homogeneous to heterogeneous flows are significant as clumps interact with each other and with the inter-clump medium in a variety of ways. We also present new experiments that, for the first time, directly address issues of magnetized astrophysical jets. Our experiments explore the propagation and stability of super-magnetosonic, radiatively cooled, and magnetically dominated bubbles with internal, narrow jets. The results are scalable to astrophysical environments via the similarity of dimensionl ss numbers controlling the dynamics in both settings. These experiments show the jets are subject to kink mode instabilities which quickly fragment the jet into narrow chains of hypersonic knots, providing support for the "clumpy jet" paradigm.
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