180 results about "Vertical gradient" patented technology

The present invention relates to a device for interfacing nanofluidic and microfluidic components suitable for use in performing high throughput macromolecular analysis. Diffraction gradient lithography (DGL) is used to form a gradient interface between a microfluidic area and a nanofluidic area. The gradient interface area reduces the local entropic barrier to nanochannels formed in the nanofluidic area. In one embodiment, the gradient interface area is formed of lateral spatial gradient structures for narrowing the cross section of a value from the micron to the nanometer length scale. In another embodiment, the gradient interface area is formed of a vertical sloped gradient structure. Additionally, the gradient structure can provide both a lateral and vertical gradient.

A weather radar detects and removes spurious aircraft from a weather radar display by using one of the methods of differentiating radar return length, estimating a vertical gradient of reflectivity, tracking radar returns into regions that are eliminated from the weather display to provide differentiation, tracking areas of radar returns that allow detection and removal of the spurious aircraft in relative geometries, differentiating Doppler velocity, and differentiating spectral width. The methods may be used individually or in combination to improve performance.

Edges are detected in block coded video by a threshold comparison upon the lengths of variable-length codes used for encoding the differential DC coefficients of the pixel blocks. A thinning filter compares the code lengths of the differential DC coefficients of adjacent blocks in order to retain the edge indications of more significant edges and to exclude the edge indications of less significant edges. The edge indications can be split into substantially independent channels for luminance or chrominance, for edges having positive or negative horizontal gradient components, and for edges having positive or negative vertical gradient components. The edge indications for successive frames in an MPEG sequence are compared to each other in various ways in order to detect scene changes.

Analytical cartridges, systems and methods of processing a sample for analysis using capillary flows. Vertical gradient sample filtration provides filtrate to an incubation chamber for a time controlled by a flow modulator at the outlet of the incubation chamber. The flow modulator can include a serpentine capillary flow path without side walls. Incubated filtrate can flow from the incubation chamber to a detection channel after a predetermined time. The detection chamber can include one or more analytical regions in a porous substrate for detection of two or more analytes on the same cartridge from the same sample.

The invention discloses a system and a method using VGF and VB growing technology to carry out crystal growth to reduce body inlaid crystal. In a demonstration embodiment, an ampoule bottle containing a raw material is inserted into a furnace with a heating resource, and a vertical gradient solidifying technology is used for crystal growth, wherein the crystallizing temperature gradient can move corresponding to the crystal and / or the furnace to melt the raw material and convert the raw material into monocrystal compound; and a vertical Bridgman technology is used for crystal growth on a crucible, wherein the ampoule bottle / heating source can relatively move to continuously melt the raw material and convert the raw material into monocrystal compound.

Analytical cartridges, systems and methods of processing a sample for analysis using capillary flows. Vertical gradient sample filtration provides filtrate to an incubation chamber for a time controlled by a flow modulator at the outlet of the incubation chamber. The flow modulator can include a serpentine capillary flow path without side walls. Incubated filtrate can flow from the incubation chamber to a detection channel after a predetermined time. The detection chamber can include one or more analytical regions in a porous substrate for detection of two or more analytes on the same cartridge from the same sample.

The invention discloses a GaAs polycrystal and liquid seal-free synthesis method and a GaAs polycrystal and liquid seal-free synthesis device. The method is based on the liquid seal-free synthesis of GaAs polycrystals and positions crystallization by a vertical Bridgman method so that synthetized cylindrical GaAs polycrystals do not comprise gallium groups and arsenic groups and are extremely uniformly distributed so as to directly satisfy the requirements of the vertical Bridgman method or the vertical gradient freezing method for the growth of GaAs single crystals. The device comprises a synthesis furnace and a graphite system, wherein the graphite system comprises an insulation unit, a heating unit, a synthesis unit and a motion unit capable of enabling the synthesis unit to lift and rotate. The synthetized GaAs polycrystals synthesized by the method of the invention reach a stoichiometric proportion at the level of a horizontal Bridgman method and avoid staining a Si impurity. Compared with a boric oxide liquid seal synthesis method, the synthesis method avoids staining a boron impurity.

The invention discloses a human eye positioning method and device which are used for solving the problem that in the prior art, human eye positioning can not be conducted on a low-resolution face image. The invention further provides a human eye region positioning method and device which are used for solving the problem that in the prior art, human eye region positioning is poor in robustness with interference from glasses and eyebrows. The human eye region positioning method comprises the steps that a left eye region and a right eye region of a face grayscale image are determined; according to horizontal grayscale integral projection, vertical grayscale integral projection, horizontal gradient integral projection and vertical gradient integral projection of the obtained left eye region, the position of the center of a left eyeball in the left eye region is determined; according to horizontal grayscale integral projection, vertical grayscale integral projection, horizontal gradient integral projection and vertical gradient integral projection of the obtained right eye region, the position of the center of a right eyeball in the right eye region is determined.

A PMR write head has a stitched shield formation which results in a strong perpendicular write field with sharp vertical gradients. The shape of the stitched shield is determined by two design parameters, d=½(WSWSLE−WMPTE), and TSWS, where WSWSLE is the width of the leading edge of the stitched shield in the ABS plane, WMPTE is the width of the trailing edge of the main magnetic pole in the ABS plane and TSWS is the thickness of the stitched shield. By a proper choice of these parameters, the write field of the head is sharply limited in the cross-track direction, so that adjacent track erasures are eliminated.

A method of analyzing electromagnetic survey data from an area of seafloor (6) that is thought or known to contain a conductive or resistive body, such as a subterranean hydrocarbon reservoir (12), is described. The method includes providing electric field data and magnetic field data, for example magnetic flux density, obtained by at least one receiver (25) from a horizontal electric dipole (HED) transmitter (22) and determining a vertical gradient in the electric field data. The vertical gradient in the electric field data and the magnetic field data are then combined to generate combined response data. The combined response data is compared with background data specific to the area being surveyed to obtain difference data sensitive to the presence of a subterranean hydrocarbon reservoir. Because the combined response data are relatively insensitive to the transverse electric (TE) mode component of the transmitted signal, the method allows hydrocarbon reservoirs to be detected in shallow water where the TE mode component interacting with the air would otherwise dominate. Furthermore, because there is no mixing between the TE and transverse magnetic (TM) modes in the combined response data, data from all possible transmitter and receiver orientations may be used. The background data may be provided by magneto-telluric surveying, controlled source electromagnetic surveying or from direct geophysical measurement.