39results about How to "Compensate for inhomogeneity" patented technology

A superconducting magnet configuration (4; 14) for generating a homogeneous magnetic field B0 in an examination volume (4b), has an interior radial superconducting main field coil (1) which is disposed rotationally symmetrically about an axis (z-axis) and an oppositely driven coaxial radially exterior superconducting shielding coil (2) is characterized in that the magnet configuration (4; 14) consists of the main field coil (1), the shielding coil (2), and a ferromagnetic field formation device (3; 18), wherein the ferromagnetic field formation device (3; 18) is located at the radially inside of the main field coil (1), the main field coil (1) consisting of an unstructured solenoid coil or of several radially nested unstructured solenoid coils (15, 16) which are driven in the same direction, the axial extent Labs of the shielding coil (2) being smaller than the axial extent Lhaupt of the main field coil (1), wherein the axial magnetic field profile (5) generated by the main field coil (1) and the shielding coil (2) during operation has a minimum of the field strength along the axis (z-axis) in the center (4a) and a maximum of the field strength on each side of the center (4a), and wherein the axial magnetic field profile (6) generated by the ferromagnetic field formation device (3; 18) during operation has a maximum of the field strength along the axis (z-axis) in the center (4a) and a minimum of the field strength on each side of the center (4a). The magnet configuration in accordance with the invention has a very simple structure.

The invention relates to a filter element for a fluid stream flowing in at the front side, in which a machine for sealing an inflow and an outflow side of the filter element in a filter housing part includes an annular sealing part. A peripheral seal in the form of an annular collar is provided on a frontal side of the filter element, connected via an axial section of the element casing surface. Part of the collar extends axially over the frontal side of the element, and a frame element is connected with an axial protuberant portion of the collar. As a result, the frame element supports the collar against forces acting radially outwards.

A method to compensate for the magnetic field heterogeneity inside an object of investigation in a MR device obtains an uncorrected magnetic field distribution of the object and executes an MR sequence with a desired k-space coverage by applying RF pulses to generate a transverse magnetization within the object. MR signal data is recorded, magnetic field shimming parameters are dynamically updated and MR signal data are reconstructed to produce images or localized spectroscopic data. Artifacts in a reconstructed image resulting from an uncorrected magnetic field distribution are suppressed by temporally separating MR signals originating from at least two different sub-volumes within a volume of transverse magnetization by generating a nonlinear phase distribution within the object and by dynamically updating shimming parameters to compensate for the field inhomogeneity distributions within the different sub-volumes in the volume of transverse magnetization.

Disclosed is a display device that can both correct unevenness in a linear space and set one unevenness-correction plane outside the linear space, correcting unevenness in ultra-low-brightness regions, thereby effectively correcting unevenness in ultra-low-brightness regions while minimizing increases in power consumption and circuit size. The disclosed display device is provided with: pixels provided with light-emitting elements, which emit light according to levels of current, and pixel circuits that control currents applied to said light-emitting elements in accordance with a video signal; a display unit in which scan lines, which with a prescribed scan period supply the pixels with a selection signal that selects the pixels to be turned on, and data lines, which supply the aforementioned video signal to the pixels, are arranged in a matrix; a first unevenness-correction unit which corrects brightness unevenness in video signals with linear characteristics; and a second unevenness-correction unit which corrects brightness unevenness in video signals with gamma characteristics, in prescribed regions and those below.

Please add the Abstract of the Disclosure which is set forth on the separate accompanying sheet. That Abstract of the Disclosure is essentially the same, in content, as the Abstract which is a part of the published PCT application WO 2004 / 085155. No new matter is being added by the presentation of the Abstract of the Disclosure.

An actively shielded superconducting magnet configuration (M1; M2; M3; 14) for generating a homogeneous magnetic field B0 in a volume under investigation (4b) has a radially inner superconducting main field coil (1) which is disposed rotationally symmetrically about an axis (z axis) and a coaxial radially outer superconducting shielding coil (2) which is operated in an opposite direction. The magnet configuration consists of the main field coil, the shielding coil and a ferromagnetic field-shaping device (3; 18), wherein the ferromagnetic field-shaping device is disposed radially inside the main field coil. The main field coil consists of an unstructured solenoid coil or of several radially nested unstructured solenoid coils (15, 16) which are operated in the same direction. An extension Labs of the shielding coil in the axial direction is smaller than the extension Lhaupt of the main field coil in the axial direction.ⅆ2ⅆz2⁢BH+A⁡(z)⁢❘z=0⁢≤0applies for the axial magnetic field profile BH+A(z) generated by the main field coil and the shielding coil during operation along the z-axis in the center at z=0 andⅆ2ⅆz2⁢BF⁡(z)⁢❘z=0⁢≥0applies for the axial magnetic field profile BF(z) generated by the ferromagnetic field-shaping device (3; 18) during operation along the z-axis in the center at z=0, wherein the z-axis is oriented in a positive direction of the B0-field. An actively shielded superconducting magnet configuration of considerably simplified structure is thereby provided with a homogeneous and particularly high magnetic field B0 in the volume under investigation.

A pixel circuit is provided, comprising: a driving transistor and a light-emitting element connected in series between a first level terminal and a second level terminal, and a second transistor, a third transistor, a fourth transistor, a first capacitor, and a second capacitor A second capacitor is connected between the control electrode of the driving transistor and the second terminal of the light-emitting element, and the threshold voltage is stored through the first capacitor, thereby realizing threshold voltage compensation for the driving transistor and the light-emitting element, and then compensating for the pixel circuit display unevenness. According to the above pixel circuit, a display device is also provided, wherein both the first control line and the light emission control line are global lines. Also disclosed is a pixel circuit driving method.

The invention relates to a filter (1) comprising a plurality of rotating filter discs (3) arranged on a shaft (2) and provided with a porous filter medium. The invention is characterized in that elastomer elements (8, 8') are used as separators and are arranged between each individual filter disc (3) on the shaft (2). The invention also relates to a filter disc (3) for such a filter (1).

A lifting device for lifting articles such as pulp units bound together by tying means, the device comprising at least one horizontal beam (1) connected to a crane and having attached thereto a plurality of The hook cranes (3) moving on the beam, when the grabbing members (4) belonging to the cranes are brought close to each other, each hook crane (3) located at the item to be lifted is arranged as a strapping device for grabbing the item, binding The device is thus suspended from the gripping member. The hook crane (3) is provided with a pair or two pairs of grasping members with a fixed distance from each other, and its grasping movement is parallel movement, and each hook crane (3) is suspended at an adjustable distance from each other by the following components: The trough member (2) of the horizontal beam (1), the trough member (2) allows each hook crane (3) to move a predetermined distance respectively in the vertical direction and tilt to a predetermined angle in the trough member; intermediate beams (8) of the beams (1), each intermediate beam (8) attached to be suspended from the horizontal beam (1) by channel members (2), the intermediate beams (8) transverse to the horizontal beams (1) and the channel members (2) Each hook crane (3) or pair of hook cranes is allowed to move a predetermined distance in the vertical direction and tilt to a predetermined angle in the trough member, respectively.