Results 21 to 30 of about 1,577,958 (284)
Geometry of Lines on a Cubic Four-Fold
International Mathematics Research Notices, 2023 Abstract For a general cubic four-fold $X\subset {\mathbb {P}}^5$ with Fano scheme of lines $F$, we prove a number of properties of the universal family of lines $I\to F$ and various subloci. We first describe the moduli and ramification theory of the genus four fibration $p:I\to X$ and explore its relation to a birational model of $F ...
Gounelas, Frank, Kouvidakis, Alexis
openaire +4 more sources
Clues to Quasar Broad Line Region Geometry and Kinematics [PDF]
, 2000 We present evidence that the high-velocity CIV lambda 1549 emission line gas of radio-loud quasars may originate in a disk-like configuration, in close proximity to the accretion disk often assumed to emit the low-ionization lines.
B. J. Wilkes +8 more
core +3 more sources
The GeoModel tool suite for detector description [PDF]
EPJ Web of Conferences, 2021 The GeoModel class library for detector description has recently been released as an open-source package and extended with a set of tools to allow much of the detector modeling to be carried out in a lightweight development environment, outside of large ...
Bandieramonte Marilena +4 more
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Kinematic Differential Geometry of a Line Trajectory in Spatial Movement
Axioms, 2023 This paper investigates the kinematic differential geometry of a line trajectory in spatial movement. Specifically, we provide a theoretical expression of inflection line congruence, which is the spatial equivalent of the inflection circle of planar ...
Areej A. Almoneef, Rashad A. Abdel-Baky
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Kinematic Geometry of a Timelike Line Trajectory in Hyperbolic Locomotions
Axioms, 2023 This study utilizes the axodes invariants to derive novel hyperbolic proofs of the Euler–Savary and Disteli formulae. The inflection circle, which is widely recognized, is situated on the hyperbolic dual unit sphere, in accordance with the principles of ...
Areej A. Almoneef, Rashad A. Abdel-Baky
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Line geometry and 3D graphic statics
Građevinar, 2019 The mathematical basis for the line geometry, with the line as its basic element, is presented in the paper because the forces that act on a body in space - whether we are interested in conditions of movement or immobility (balance) of that body - are ...
Iva Kodrnja +2 more
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Open string theory and planar algebras [PDF]
, 2009 In this note we show that abstract planar algebras are algebras over the topological operad of moduli spaces of stable maps with Lagrangian boundary conditions, which in the case of the projective line are described in terms of real rational functions ...
Alling N L +12 more
core +5 more sources
Miranda: Revue Pluridisciplinaire du Monde Anglophone, 2012 In the text now known as the Histories of the Dividing line, William Byrd II narrates the survey, in 1728, of the straight line marking the Virginia-North Carolina border.
Julien Nègre
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EXPERIMENTS WITH UAS IMAGERY FOR AUTOMATIC MODELING OF POWER LINE 3D GEOMETRY [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015 The ideal mapping technology for transmission line inspection is the airborne LiDAR executed from helicopter platforms. It allows for full 3D geometry extraction in highly automated manner.
G. Jóźków, B. Vander Jagt, C. Toth
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Nut Geometry Inspection Using Improved Hough Line and Circle Methods
Sensors, 2023 Nuts are the cornerstone of human industrial construction, especially A-grade nuts that can only be used in power plants, precision instruments, aircraft, and rockets.
En-Yu Lin +2 more
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