37 results about "Center of area" patented technology

The invention relates to an arrangement and a method for contactless energy transmission by means of induction. There are a plurality of coils arranged in a matrix, the coils having at least one conductor that surrounds a central axis of the coil at least once in one turn. The central axis stands vertically on the surface surrounded by the conductor in the geometric center of area of the surrounded surface. The coils are arranged adjacent to one another in a planar unit that extends in a first dimension, in a second dimension, and in a third dimension. The extension of the planar unit in the first dimension and in the second dimension is significantly greater than in the third dimension. The central axis of each coil stands at least locally at least nearly perpendicular to the surface spanned by the first dimension and the second dimension. The coils are also arranged in a regular manner within the planar unit in rows and/or columns such that each coil has at least two or three immediately adjacent coils. The distances between geometric centers of area of the coils and the shape and the extension of the at least one turn per coil are selected such that the mutual electromagnetic coupling between coils is minimal for all pairs of immediately adjacent coils in the planar unit.

The embodiment of the invention discloses a high-precision and high anti-interference positioning method and device for a Mark point of a PCB. The high-precision and high anti-interference positioning method for the Mark point of the PCB comprises the steps of performing picture partition on a picture of a to-be-positioned datum point Mark point according to a differential value between pixel values to obtain a sub-picture; acquiring the rough circle center and the rough radius of the circular area in the sub-picture by adopting a center of area method; based on the rough circle center and the rough radius of the circular area, determining the datum point in the picture by utilizing a probe method. Interferences of other circular objects can be effectively eliminated, the anti-interference performance of PCB datum point positioning can be improved, and the positioning precision can be further improved.

The invention relates to a progressive addition ophthalmic lens and a preparation method thereof. A distant vision zone of the lens has a constant focal power in a range having an about 120-degree flare angle upwards, the deviation is smaller than 0.25 diopters, and the center width of the zone is at least 32mm. The astigmatism in a near vision zone is smaller than 0.25 diopters, and the center width of the zone is at least 10mm. The zone with the constant focal power is substantially superposed with the zone with astigmatism smaller than 0.25 diopters. According to the invention, the contour line distribution is obtained by using a numerical method to dissolve Laplace's equation, and surface rise data of the lens to be processed can be obtained by designing the focal power distributions on the contour line and the meridian line cooperatively. The lens provided by the invention can effectively improve object observing definition and comfort of wearers.

The invention discloses a time-domain filtering method based on photon flight time correlation. First of all, photon flight time is obtained by performing scanning by use of a laser radar under the condition of a quite low signal-to-noise ratio, then by use of the flight time correlation between photons, filtering conditions are set for determining the flight time of the photons, signal photons and noise photons are distinguished from each other, next, detection photons which are determined as the noise photons are removed, and only the detection photons which are determined as the signal photons are reserved, finally, a center of area method is applied to the signal photons, the accurate flight time of the photons is extracted, and thus distance information is obtained. Experiments show that under the condition of the quite low signal-to-noise ratio, the method provided by the invention can effectively filter the noise photons in signals obtained by scanning through the three-dimensional imaging laser radar so as to realize the purpose of denoising.

The invention relates to medical apparatuses and instruments, in particular to a pressure dressing device used after a thyroid operation. The pressure dressing device used after a neck operation comprises a fixed belt, a support frame board, an H-shaped pressure board, a pressure water sac (comprises an elastic ball sac, a pressure gage, a water injection joint and a pipeline of the water injection joint). In time of using the pressure dressing device used after the neck operation to dress, firstly, a cutting opening is dressed conventionally, and a negative pressure drainage pipe (drainage bar) is connected. The pressure dressing device is fixed on the neck through the support frame plate from rear to front, and meanwhile, the positions of the pressure board and the water sac are adjusted so that the center of the pressure dressing device directs at the center of area needing oppressing. The pressure gage is observed simultaneously when the water injection joint injects water so as to enable pressure of a wound surface (water sac) of the neck to be adjusted within a safe range required by an operator. The pressure dressing device used after the thyroid operation has the advantages of accurately balancing the wound surface needing oppressing after the oppressing operation, and oppressing on adjacent portions, especially on tracheas is avoided. Therefore, under the condition that the problem of oppression after the neck operation is solved, respiratory function of a patient is prevented from being affected and discomfort of the patient after pressure dressing after the operation is greatly relieved.

The invention relates to an image segmentation method and system. A super pixel is extracted from an image to be segmented, a regional center point of the super pixel is obtained and marked, and mark information of the regional center point of the super pixel is used to mark unmarked sample points. When the regional center point of the super pixel is marked, sparse simplification is carried out on an undirected weighted graph constructed by the sampling points, and a graph based semi-monitoring learning algorithm is used for marking. When the other unmarked sampling points are marked, the unmarked sampling points are marked in a classified manner by utilizing K-neighbor and taking the regional center of the super pixel as basis. The method and system are characterized by being high in speed, high in marking accuracy and suitable for large-scale image segmentation.

A magnetic memory device is provided in which, even when a recording layer having an asymmetric shape and a local via are formed over a strap wiring with a sufficient distance allowed therebetween, increase in the size of the magnetic memory device can be suppressed. The magnetic memory device includes the strap wiring, the local via, and a magnetic recording element (TMR element). The TMR element includes a fixed layer and the recording layer. The planar shape of the recording layer is asymmetric with respect to the direction of the easy magnetization axis of the recording layer and is symmetric with respect to the axis of symmetry perpendicular to the easy magnetization axis. The contoured portion of the recording layer on the side closer to the center of area of the recording layer is opposed to the local via formation side.

The invention belongs to an intelligent residential district communication Ethernet system, wherein the system comprises intranet access, a district network system which adopts a star-shaped topological structure, and is divided into a system center, a regional center, a residential building and four grades of users, and a district network intelligent control center which comprises a network core switchboard, a router connected with wide area network, a server and a management work station. The invention is an intelligent residential district communication Ethernet system with advancement, expansibility and high performance price ratio.

The invention discloses an output calibration method for a public-viewpoint naked-eye true three-dimensional display system. The method comprises the following steps that photosensitive sensors are arranged at the two ends of the side edges of a standard display area, and a current projector is selected; only the current projector is turned on, the central point of the current projector is adjusted so as to be aligned with the central point of the standard display area, wherein the projection area is larger than the standard display area; a content output window is initialized, and the four vertexes of the content output window are sequentially moved toward the inner side of the content output window in a black background so that the content output window and the standard display area can coincide with each other; whether all the projectors are calibrated or not is judged, and if not, the next projector which is not calibrated is selected as the current projector to be calibrated and is recalibrated; if all the projectors are calibrated, the task is ended and quit. The output calibration method has the advantages that adjustment accuracy is high, adaptability is high, hardware overheads are low, the interference between all videos is little, adjustment is fast, the method is easy and convenient to use, and manpower consumption and time consumption are low.

The embodiment of the invention provides an intelligent door and window communication system. The intelligent door and window communication system comprises a distributed decentration structure or a regional center type decentration structure, wherein each node in the distributed decentration structure is in back-up correlation with other nodes, and each node can send an instruction to other nodes; the regional center type decentration structure comprises multiple nodes with different authority levels, nodes with the same authority levels are in back-up correlation, and the nodes with higher authority levels send instructions to the nodes with lower authority levels or the same authority levels. According to the embodiment of the intelligent door and window communication system, the decentration control mode is adopted, and therefore the fault tolerance, anti-interference performance and safety of the intelligent door and window communication system are all remarkably promoted.

In a thin film transistor device, partition walls define first, second, and third apertures. In plan view, at a bottom portion of the first aperture, a center of a total of areas of a source electrode portion and a drain electrode portion is offset from a center of area of the bottom portion in a direction differing from a direction of the third aperture, and at a bottom portion of one of the first and second apertures, a center a total of areas of a source electrode portion and a drain electrode portion is offset from a center of area of the bottom portion in a direction differing from a direction of the other one of the first and second apertures.