We classify complex projective varieties of dimension 2r ≥ 8 swept out by a family of codimension two grassmannians of lines G(1, r). They are either fibrations onto normal surfaces such that the general fibers are isomorphic to G(1, r) or the grassmannian G(1, r +1). The cases r = 2 and r = 3 are also considered in the more general context of varieties swept out by codimension two linear space...

We present a method for calculating the envelope surface of a parametric solid object swept along a path in threedimensional space. The boundary surface of the solid is the combination of parametric surfaces and an implicit surface where the Jacobian of the defining function has a rankdeficiency condition. Using this condition, we determine a set of square sub-Jacobian determinants that must al...

In this letter, a phase-sensitive, swept-source optical coherence tomography (SS-OCT) system is implemented for the optical measurement of nanostructures. A new approach is proposed to reduce the phase errors, resulting from trigger jitter of the swept source and the asynchronization between the A-scan trigger and OCT signal at the data acquisition end, with a narrowband fiber Bragg grating to ...

We report that the complex conjugate artifact in Fourier domain optical coherence tomography approaches (including spectral domain and swept source OCT) may be resolved by the use of novel interferometer designs based on 3x3 and higher order fiber couplers. Interferometers built from NxN (N>2) truly fused fiber couplers provide simultaneous access to non-complementary phase components of the co...

We have explored the design and development of magnetically-resonant tag readers for application to tangible computer interfaces. To this end, we constructed a ringdown tag reader and a swept-frequency tag reader, both capable of real-time continuous interaction with multiple tagged objects. Although the ringdown reader worked well for smaller numbers of tags, the swept-frequency tag reader pro...

This paper presents a system for editing strip-like patches on the mesh using swept surface. The user first selects a rough cylinder-like region, the boundary of which is automatically refined. A swept surface approximation is automatically done, including extraction of the trajectory and the corresponding deforming 2D curves. The swept surface is described by a map from a real interval to both...

We demonstrate an application of high-speed swept source optical coherence tomography for vessel visualization in the anterior segment of the human eye. The human corneo-scleral junction and sclera was imaged in vivo. Imaging was performed using a swept source OCT system operating at the 1050nm wavelength range and 100kHz A-scan rate. High imaging speed enables the generation of 3D depth-resolv...

This paper discusses the automaticcomputation of viewpoints for monitoringobjects and features in an active robot work-cell. An important step in our algorithm for finding viewpoints is the computation of the volumes swept by polyhedral objects moving through space. A method for approximating these volumes for arbitrarily moving polyhedra is presented. Some swept volume results are presented, a...

This paper presents transonic buffet simulations over a swept wing of supercritical airfoils with Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Detached-Eddy Simulation (DES) methods. The NASA SC(2)-0714 airfoil is used as wing profile. Computations are conducted at free-stream Mach numbers from 0.72 to 0.84 for Reynolds number 45.0 × 10 based on aerodynamic chord length. Firstly, 2D NAS...

Hexahedral meshing needs performing volume decomposition that decomposes a complex shape into simple hex meshable sub-domains, which is a very time-consuming and experience needed work. It is necessary to research and develop intelligent swept volume decomposition approaches. The fundamental work of the volume decomposition approaches based on reconstruction of swept features is to recognize th...