Visualizing second order tensor fields with hyperstreamlines

Hyperstreamlines are a generalization to second order tensor fields of the conventional streamlines used in vector field visualization. As opposed to point icons commonly used in visualizing tensor fields, hyperstreamlines form a continuous representation of the complete tensor information along a three-dimensional path. This technique is useful in visulaizing both symmetric and unsymmetric three-dimensional tensor data. Several examples of tensor field visualization in solid materials and fluid flows are provided

Pathogenesis and treatment of intraocular hypertension due to delayed anterior chamber formation after lens extraction

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Measurement of the output of aqueous humor in man; study of 180 cases.

peer reviewedOphthalmotomy depends upon 3 factors: a) production of aqueous humor, b) resistance to drainage of aqueous humor, c)blood pressure in the luminary veins. Most cases of hypertension are due to an increased resistance in (he drainage of aqueous humor. A rise in blood pressure in the episcleral veins only occurs in certain exceptional cases. It has not been shown (hat ocular hypertension can be caused exclusively by hypersecretion. On ihe other hand, however, a considerable number of cases of ocular hypotension can be attributed to a reduction in production of aqueous humor. This is the case in uveitis and acute ophthalmomalacia. Iridectomy and iridencleisis are followed by a temporary decrease of the formation of aqueous humor, but their main hypotensive action is due to a diminution in the resistance of the outflow. The hypotensive effect of retrociliary diathermy is caused exclusively by the permanent reduction in production of aqueous humor. © 1954 S. Karger AG, Basel

Pathogenesis and treatment of changes in ocular tension during uveitis

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Classifying the Isolated Zeros of Asymptotic Gravitational Radiation by Tendex and Vortex Lines

A new method to visualize the curvature of spacetime was recently proposed. This method finds the eigenvectors of the "electric" and "magnetic" components of the Weyl tensor and, in analogy to the field lines of electromagnetism, uses the eigenvectors' integral curves to illustrate the spacetime curvature. Here we use this approach, along with well-known topological properties of fields on closed surfaces, to show that an arbitrary, radiating, asymptotically flat spacetime must have points near null infinity where the gravitational radiation vanishes. At the zeros of the gravitational radiation, the field of integral curves develops singular features analogous to the critical points of a vector field. We can, therefore, apply the topological classification of singular points of unoriented lines as a method to describe the radiation field. We provide examples of the structure of these points using linearized gravity and discuss an application to the extreme-kick black-hole-binary merger.Comment: 10 pages, 10 figures. Changed to reflect published version, sign errors fixe

Simple quad domains for field aligned mesh parametrization

We present a method for the global parametrization of meshes that preserves alignment to a cross field in input while obtaining a parametric domain made of few coarse axis-aligned rectangular patches, which form an abstract base complex without T-junctions. The method is based on the topological simplification of the cross field in input, followed by global smoothing

Pathogenesis and treatment of changes in ocular tension during uveitis

peer reviewe