scholarly journals Cut App&play: um método coreográfico-audiovisual de emergência poética

REPERTÓRIO ◽  
2017 ◽  
pp. 191
Author(s):  
Lali Krotoszynski
Keyword(s):  
Motion Capture ◽  
Test Tube ◽  
Two Dimensions ◽  
The Body ◽  
Three Dimensions ◽  
Music Video ◽  
Audiovisual Medium ◽  
Dance Training ◽  
Creative Abilities

<p class="p1">Resumo:<span class="Apple-converted-space"> </span></p><p class="p2">Partindo de uma formação eclética em dança e da experiência em <em>performance</em>, interessei-me cada vez mais por explorar a ideia de um pensamento coreográfico aplicado a estruturas audiovisuais interativas, e, nesta direção, realizei projetos em meios, como fotografia, Slow-Scan TV (SSTV), animação, música, vídeo, Motion Capture e Internet. Ao longo dos anos de pesquisa nesse trajeto foi delineando-se uma metodologia que inclui o desenvolvimento de dispositivos computacionais dotados de capacidades criativas, formuladas segundo parâmetros advindos da experiência da dança. Este artigo pretende ilustrar a perspectiva poética da pesquisa que toma o meio audiovisual como um “tubo de ensaio” de criação de movimento na qual articulações entre imagem e som “falam” ao corpo, e “saltam” de duas dimensões para três dimensões, ou seja, da tela para o corpo</p><p class="p3"><span class="s1">Palavras-chave:<span class="Apple-converted-space"> </span></span>Método criativo. Movimento. Coreografia. Audiovisual. Dispositivo computacional interativo.</p><p class="p3"> </p><p class="p3">CUT APP&amp;PLAY: A CHOREOGRAPHIC-AUDIOVISUAL METHOD FOR POETIC EMERGENCE</p><p class="p1"><em>Abstract:<span class="Apple-converted-space"> </span></em></p><p class="p5"><em>Abstract: Departing from an eclectic dance training, and from my experience as performance artist, I have been increasingly drawn to explore the application of choreographic thinking in interactive audiovisual structures and, in this direction, I have developed projects in media such as photography, Slow-Scan TV (SSTV), animation, music, video, Motion Capture and Internet. Throughout the years of research in this path, a methodology utilizing specially developed</em><span class="s2"><em> computational devices endowed with creative abilities, formulated by parameters from dance experience. This article intends to illustrate the poetic perspective of the research that takes the audiovisual medium as a “test tube” for movement creation </em></span><span class="s3"><em>in which articulations between image and sound “speak” to the body, and “jump” from two dimensions to three dimensions, i.e, from the screen to the body.</em></span></p><p class="p6"><span class="s1"><em>Keywords:<span class="Apple-converted-space"> </span></em></span><em>Creative Method. Movement. Choreography. Audiovisual. Interactive Computational Device.</em></p>

Boundary integrals for oscillating bodies in stratified fluids

2021 ◽  
Vol 927 ◽  
Author(s):  
Bruno Voisin
Keyword(s):  
Single Layer ◽  
Elliptic Cylinder ◽  
Radiation Condition ◽  
Two Dimensions ◽  
Boundary Integral ◽  
The Body ◽  
Boundary Integral Method ◽  
Three Dimensions ◽  
Double Layers ◽  
Classical Potential Theory

The theoretical foundations of the boundary integral method are considered for inviscid monochromatic internal waves, and an analytical approach is presented for the solution of the boundary integral equation for oscillating bodies of simple shape: an elliptic cylinder in two dimensions, and a spheroid in three dimensions. The method combines the coordinate stretching introduced by Bryan and Hurley in the frequency range of evanescent waves, with analytic continuation to the range of propagating waves by Lighthill's radiation condition. Not only are the waves obtained for arbitrary oscillations of the body, with application to radial pulsations and rigid vibrations, but also the distribution of singularities equivalent to the body, allowing later inclusion of viscosity in the theory. Both a direct representation of the body as a Kirchhoff–Helmholtz integral involving single and double layers together, and an indirect representation involving a single layer alone, are considered. The indirect representation is seen to require a certain degree of symmetry of the body with respect to the horizontal and the vertical. As the surface of the body is approached the single- and double-layer potentials exhibit the same discontinuities as in classical potential theory.

scholarly journals The flow of viscous liquid past spinning bodies

1933 ◽  
Vol 142 (847) ◽  
pp. 491-508 ◽  
Keyword(s):  
Circular Cylinder ◽  
Viscous Liquid ◽  
Stokes Equations ◽  
Slow Motion ◽  
Two Dimensions ◽  
The Body ◽  
Three Dimensions ◽  
Stream Velocity ◽  
Flow Past ◽  
Spinning Bodies

The motion produced in a viscous liquid by a spinning sphere has been investigated for small values of the Reynolds’ number, using Stokes’ equations for slow motion, in which the inertia terms are neglected.* By combining the solution for this problem with that given by Stokes for the flow of a stream of viscous liquid past a fixed sphere, we obtain the solution for a stream flowing past a spinning sphere. Oseen introduced a modified system of equations, in which the inertia terms are partly taken into account, and obtained the solution for flow past a fixed sphere using these equations. The problem of the flow of viscous liquid past a fixed circular cylinder has been investigated by Lamb,§ using Oseen’s equations, and the additional solution required if the cylinder is rotating has been given by Oseen.║In the present paper the solution for flow past a spinning sphere is discussed, using Oseen’s equations. The flow of viscous liquid past a spinning body is physically equivalent to motion of the body through the liquid with combined translation and rotation. Now it is well known that in practice when a body moves through a liquid in such a manner, if there is rotation about an axis y perpendicular to the direction of motion x , then ther is a lift on the body in a direction perpendicular to both x and y ¶. In theoretical investigation , if we suppose that the motion is steady, we are restricted in three dimensions to a body rotating about an axis of symmetry, and in two dimensions to the circular cylinder. In these cases it is impossible to obtain a lift if we use Stokes' equations for slow motion. For since that equations are linear, the lift is the sum of the lifts due to the solution for flow past a fixed body and the solution for spin without flow, and these are both zero by symmetry. This argument does not apply to Oseen's equations, since we cannot have a solution for spin alone with no flow, the stream velocity being implied in the equations themselves. In the absence of a method for solving the complete hydrodynamcial equations, it is therefore of interest to investigate the flow of viscous liquid past spinning bodies, using Oseen's equations, and particularly to find whether a lift is obtained.

Softening Instability: Part II—Localization Into Ellipsoidal Regions

1988 ◽  
Vol 55 (3) ◽  
pp. 523-529 ◽  
Author(s):  
Zdeneˇk P. Bazˇant
Keyword(s):  
Strain Softening ◽  
Finite Size ◽  
Elastic Solid ◽  
Two Dimensions ◽  
The Body ◽  
Three Dimensions ◽  
Strain Diagram ◽  
Equilibrium Path ◽  
Special Cases ◽  
Localization Instability

Extending the preceding study of exact solutions for finite-size strain-softening regions in layers and infinite space, exact solution of localization instability is obtained for the localization of strain into an ellipsoidal region in an infinite solid. The solution exploits Eshelby’s theorem for eigenstrains in elliptical inclusions in an infinite elastic solid. The special cases of localization of strain into a spherical region in three dimensions and into a circular region in two dimensions are further solved for finite solids — spheres in 3D and circles in 2D. The solutions show that even if the body is infinite the localization into finite regions of such shapes cannot take place at the start of strain-softening (a state corresponding to the peak of the stress-strain diagram) but at a finite strain-softening slope. If the size of the body relative to the size of the softening region is decreased and the boundary is restrained, homogeneous strain-softening remains stable into a larger strain. The results also can be used as checks for finite element programs for strain-softening. The present solutions determine only stability of equilibration states but not bifurcations of the equilibrium path.

Kinematic strategies and sensorimotor transformations in the wiping movements of frogs

1989 ◽  
Vol 62 (3) ◽  
pp. 750-767 ◽  
Author(s):  
S. F. Giszter ◽  
J. McIntyre ◽  
E. Bizzi
Keyword(s):  
Degrees Of Freedom ◽  
Joint Angle ◽  
Video Recording ◽  
Two Dimensions ◽  
The Body ◽  
Three Dimensions ◽  
Postural Adjustment ◽  
Leopard Frogs ◽  
Motor Commands ◽  
Sensorimotor Transformations

1. Spinal frogs are known to make coordinated and successful wiping movements to almost all places on the body and legs. Such wiping movements involve a sensorimotor transformation. Information from both the spatial locations of stimuli on the skin and the body configuration of the frog is transformed into a set of motor commands that generate body movements adequate to successfully remove the irritant. The spinal cord itself therefore has a limited capacity for sensorimotor transformations. 2. We examined the kinematics of wiping motions in both spinal and intact leopard frogs and bullfrogs. This data was used to assess the flexibility, precision, and strategy of the kinematic sensorimotor transformations used during wiping. The movements involved the use of redundant degrees of freedom in the limbs. Thus many possible movements or solutions could generate successful wiping. This redundancy allows motor-equivalent movements to be used by the frog. 3. Movements were examined in two dimensions by the use of VHS shuttered-video recording and in three dimensions with the use of a WATSMART system of infrared diodes and cameras. The kinematic analysis was applied to those motions in which the limbs did not interact with kinematic constraints, such as the surface of the substrate or body. These unconstrained motions are directly related to motor commands and thus more easily interpreted. 4. Wiping movements to the back were retained in essentially the same form in both spinal and intact frogs. In both cases wiping had four phases with a fifth occasionally present. The phases included flexion, placing, aiming, and whisking, with occasional extension and multiply repeated wipes. However, the aiming phase was often very brief or absent in this data, and flexion was sometimes omitted in multiple wipes. We found that the placing posture was adjusted in a simple way in response to variations in the location of the target stimulus. The rostrocaudal position of the foot tip was strongly and linearly related to the rostrocaudal stimulus location. 5. During the placing posture, joint angles as well as the limb tip in back wipes had linear relationships to the stimulus' rostrocaudal coordinate. The limb configuration used by the frog allowed a strategy of linear (and potentially independent) postural adjustment of joint angle to stimulus position to generate almost linear endpoint adjustments in the placing phase of wiping. This solution to the ill-posed problem of choosing a joint angle for the placing posture in back-wiping may be computationally simple.(ABSTRACT TRUNCATED AT 400 WORDS)

A Three-Dimensional Generalization of Instant Center Method Using Line Geometry

2007 ◽  
Author(s):  
Jasem Baroon ◽  
Bahram Ravani
Keyword(s):  
Three Dimensional ◽  
Two Dimensions ◽  
The Body ◽  
Three Dimensions ◽  
Line Geometry ◽  
Screw Axis ◽  
Instantaneous Screw Axis ◽  
Instantaneous Center ◽  
Point Of Intersection ◽  
Instantaneous Screw

For a planar motion of a body, there exists an instantaneous center of zero velocity or what is known as the centrode. In three-dimensions, the same is represented by the instantaneous screw axis. In two dimensions, however, there is a geometric method of construction the instant center by using the velocity vectors of two points of the body. The instant center is the point of intersection of the lines perpendicular to the two velocity vectors. This type of construction, however, did not exist for the instantaneous screw axis. In this paper, we present such a geometric construction for the instantaneous screw axis using line geometry.

scholarly journals Data on Orientation to Happiness in Higher Education Institutions from Mexico and El Salvador

Data ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 27
Author(s):  
Domingo Villavicencio-Aguilar ◽  
Edgardo René Chacón-Andrade ◽  
Maria Fernanda Durón-Ramos
Keyword(s):  
Higher Education ◽  
El Salvador ◽  
Latin American ◽  
Higher Education Institutions ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Stepwise Multiple Regression ◽  
Teacher Student ◽  
And Gender ◽  
Student’S T

Happiness-oriented people are vital in every society; this is a construct formed by three different types of happiness: pleasure, meaning, and engagement, and it is considered as an indicator of mental health. This study aims to provide data on the levels of orientation to happiness in higher-education teachers and students. The present paper contains data about the perception of this positive aspect in two Latin American countries, Mexico and El Salvador. Structure instruments to measure the orientation to happiness were administrated to 397 teachers and 260 students. This data descriptor presents descriptive statistics (mean, standard deviation), internal consistency (Cronbach’s alpha), and differences (Student’s t-test) presented by country, population (teacher/student), and gender of their orientation to happiness and its three dimensions: meaning, pleasure, and engagement. Stepwise-multiple-regression-analysis results are also presented. Results indicated that participants from both countries reported medium–high levels of meaning and engagement happiness; teachers reported higher levels than those of students in these two dimensions. Happiness resulting from pleasure activities was the least reported in general. Males and females presented very similar levels of orientation to happiness. Only the population (teacher/student) showed a predictive relationship with orientation to happiness; however, the model explained a small portion of variance in this variable, which indicated that other factors are more critical when promoting orientation to happiness in higher-education institutions.

scholarly journals Free partition functions and an averaged holographic duality

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Nima Afkhami-Jeddi ◽  
Henry Cohn ◽  
Thomas Hartman ◽  
Amirhossein Tajdini
Keyword(s):  
Partition Function ◽  
Spectral Gap ◽  
Central Charge ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Partition Functions ◽  
General Constraints ◽  
Dimensional Gravity ◽  
Holographic Duality

Abstract We study the torus partition functions of free bosonic CFTs in two dimensions. Integrating over Narain moduli defines an ensemble-averaged free CFT. We calculate the averaged partition function and show that it can be reinterpreted as a sum over topologies in three dimensions. This result leads us to conjecture that an averaged free CFT in two dimensions is holographically dual to an exotic theory of three-dimensional gravity with U(1)c×U(1)c symmetry and a composite boundary graviton. Additionally, for small central charge c, we obtain general constraints on the spectral gap of free CFTs using the spinning modular bootstrap, construct examples of Narain compactifications with a large gap, and find an analytic bootstrap functional corresponding to a single self-dual boson.

Turbulent three-dimensional dielectric electrohydrodynamic convection between two plates

2012 ◽  
Vol 696 ◽  
pp. 228-262 ◽  
Author(s):  
A. Kourmatzis ◽  
J. S. Shrimpton
Keyword(s):  
Spatial Data ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Energy Budgets ◽  
Turbulent Regime ◽  
Scalar Flux ◽  
Wide Range ◽  
Scalar Variance

AbstractThe fundamental mechanisms responsible for the creation of electrohydrodynamically driven roll structures in free electroconvection between two plates are analysed with reference to traditional Rayleigh–Bénard convection (RBC). Previously available knowledge limited to two dimensions is extended to three-dimensions, and a wide range of electric Reynolds numbers is analysed, extending into a fully inherently three-dimensional turbulent regime. Results reveal that structures appearing in three-dimensional electrohydrodynamics (EHD) are similar to those observed for RBC, and while two-dimensional EHD results bear some similarities with the three-dimensional results there are distinct differences. Analysis of two-point correlations and integral length scales show that full three-dimensional electroconvection is more chaotic than in two dimensions and this is also noted by qualitatively observing the roll structures that arise for both low (${\mathit{Re}}_{E} = 1$) and high electric Reynolds numbers (up to ${\mathit{Re}}_{E} = 120$). Furthermore, calculations of mean profiles and second-order moments along with energy budgets and spectra have examined the validity of neglecting the fluctuating electric field ${ E}_{i}^{\ensuremath{\prime} } $ in the Reynolds-averaged EHD equations and provide insight into the generation and transport mechanisms of turbulent EHD. Spectral and spatial data clearly indicate how fluctuating energy is transferred from electrical to hydrodynamic forms, on moving through the domain away from the charging electrode. It is shown that ${ E}_{i}^{\ensuremath{\prime} } $ is not negligible close to the walls and terms acting as sources and sinks in the turbulent kinetic energy, turbulent scalar flux and turbulent scalar variance equations are examined. Profiles of hydrodynamic terms in the budgets resemble those in the literature for RBC; however there are terms specific to EHD that are significant, indicating that the transfer of energy in EHD is also attributed to further electrodynamic terms and a strong coupling exists between the charge flux and variance, due to the ionic drift term.

scholarly journals On the forces that cable webs under tension can support and how to design cable webs to channel stresses

2019 ◽  
Vol 475 (2223) ◽  
pp. 20180781 ◽  
Author(s):  
Guy Bouchitté ◽  
Ornella Mattei ◽  
Graeme W. Milton ◽  
Pierre Seppecher
Keyword(s):  
Linear Programming ◽  
Convex Hull ◽  
Structural Engineering ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Sufficient Condition ◽  
Necessary And Sufficient Condition ◽  
Finite Dimensional ◽  
Necessary And Sufficient

In many applications of structural engineering, the following question arises: given a set of forces f 1 ,  f 2 , …,  f N applied at prescribed points x 1 ,  x 2 , …,  x N , under what constraints on the forces does there exist a truss structure (or wire web) with all elements under tension that supports these forces? Here we provide answer to such a question for any configuration of the terminal points x 1 ,  x 2 , …,  x N in the two- and three-dimensional cases. Specifically, the existence of a web is guaranteed by a necessary and sufficient condition on the loading which corresponds to a finite dimensional linear programming problem. In two dimensions, we show that any such web can be replaced by one in which there are at most P elementary loops, where elementary means that the loop cannot be subdivided into subloops, and where P is the number of forces f 1 ,  f 2 , …,  f N applied at points strictly within the convex hull of x 1 ,  x 2 , …,  x N . In three dimensions, we show that, by slightly perturbing f 1 ,  f 2 , …,  f N , there exists a uniloadable web supporting this loading. Uniloadable means it supports this loading and all positive multiples of it, but not any other loading. Uniloadable webs provide a mechanism for channelling stress in desired ways.

scholarly journals PARALLEL DELAUNAY REFINEMENT: ALGORITHMS AND ANALYSES

2007 ◽  
Vol 17 (01) ◽  
pp. 1-30 ◽  
Author(s):  
DANIEL A. SPIELMAN ◽  
SHANG-HUA TENG ◽  
ALPER ÜNGÖR
Keyword(s):  
Mesh Size ◽  
Constant Factor ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Delaunay Refinement ◽  
Steiner Points ◽  
Input Domain ◽  
Set Of Points ◽  
Refinement Algorithm

We present a parallel Delaunay refinement algorithm for generating well-shaped meshes in both two and three dimensions. Like its sequential counterparts, the parallel algorithm iteratively improves the quality of a mesh by inserting new points, the Steiner points, into the input domain while maintaining the Delaunay triangulation. The Steiner points are carefully chosen from a set of candidates that includes the circumcenters of poorly-shaped triangular elements. We introduce a notion of independence among possible Steiner points that can be inserted simultaneously during Delaunay refinements and show that such a set of independent points can be constructed efficiently and that the number of parallel iterations is O( log 2Δ), where Δ is the spread of the input — the ratio of the longest to the shortest pairwise distances among input features. In addition, we show that the parallel insertion of these set of points can be realized by sequential Delaunay refinement algorithms such as by Ruppert's algorithm in two dimensions and Shewchuk's algorithm in three dimensions. Therefore, our parallel Delaunay refinement algorithm provides the same shape quality and mesh-size guarantees as these sequential algorithms. For generating quasi-uniform meshes, such as those produced by Chew's algorithms, the number of parallel iterations is in fact O( log Δ). To the best of our knowledge, our algorithm is the first provably polylog(Δ) time parallel Delaunay-refinement algorithm that generates well-shaped meshes of size within a constant factor of the best possible.

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