52results about How to "Not very dependent" patented technology

The invention provides a video motion shadow detecting method based on lighting compensation. The method includes: using a background differencing method to obtain the foreground area with motion shadows, using color features to extract candidate shadow areas, randomly sampling the areas to estimate the parameters of lighting compensation, and differencing the compensated background area with the foreground area to obtain the motion shadow detecting result. The method has the advantages that any scene assumption can be avoided, and manual intervention is not needed; compared with other multi-feature shadow detecting methods, the method can fuse multiple features reasonably, instantaneity and accuracy are achieved, and the method is well applicable to scene and environmental variations.

The invention discloses a low-sensitive type polycarboxylic acid slump retaining agent and a preparation method thereof. A structural formula of effective components of the low-sensitive type polycarboxylic acid slump retaining agent is shown as below (please see the formula in the description). The low-sensitive type polycarboxylic acid slump retaining agent can effectively reduce sensitivity of age flowing of concrete, and the phenomena that due to the fact that the mixing amount of the polycarboxylic acid slump retaining agent is too high or too low, after standing is conducted on the concrete, bleeding (even segregation) occurs, or the flowability is too poor can be effectively avoided.

The invention discloses a preparation method of a medical artificial joint material, comprising the following steps: (1) modified ultra-high molecular weight polyethylene; (2) preparation of polyaddition; (3) Ti-Ce-Ge-Cr-Ta Preparation of alloy powder; (4) surface modification of Ti-Ce-Ge-Cr-Ta alloy powder; (5) molding of artificial joint materials. The invention also discloses the medical artificial joint material prepared according to the preparation method of the medical artificial joint material. The medical artificial joint material disclosed by the invention has the advantages of low preparation cost, high wear resistance, high strength and high oxidation resistance, good biological fixation performance with host bone tissue, long service life, non-toxicity and good biocompatibility.

The present application discloses a line longitudinal differential protection method based on current zero-crossing point for synchronization, including: detecting and classifying the zero-crossing point of the current before the fault; after the protection starting element acts, selecting a zero-crossing point as a reference point, and virtualizing a zero-crossing point The sine wave is used as the reference phasor; the amplitude and phase of the current phasor are calculated with the virtual reference phasor as the reference; the time difference between the current sampling time and the reference point is used as the time label; the amplitude, phase and time of the current phasor are included The current information of the current side of the label and the zero-crossing point type is sent to the opposite side; the current information of the current side and the opposite side is compared, and the current information of the opposite side is processed; the current information of the current side and the opposite side with the same time tag is used to calculate the differential current and Braking current to achieve synchronization of current on both sides. The present invention is not affected by the inconsistency of the delay of the receiving and sending channels, has low requirements on the communication rate and channel performance, is not strongly dependent on the longitudinal channel, and has the advantages of strong economy and high reliability.