Abstract: A plastic bearing for a steering column includes a housing, an inner race, and a middle race. A retainer and balls are arranged between the middle race and the inner race. An accommodating cavity is formed in the housing; the middle race is arranged in the accommodating cavity. Guide protrusions are arranged on an inner wall of the accommodating cavity. Two positioning protrusions are arranged on an outer wall of the middle race, and an insertion groove is formed between the two positioning protrusions. The guide protrusion is matched with the insertion groove. Buckles are arranged on the inner wall of the accommodating cavity. Clamping blocks are arranged on the outer wall of the middle race, and the clamping blocks are clamped in the buckles. The overall structure of the plastic bearing for a steering column is more compact and simple and can be easily and conveniently assembled.

Abstract: The present disclosure provides a method for an accurate well-seismic tie based on stepwise matching and optimization, including: determining target seismic data as a seismic trace near well and performing first data processing on the target seismic data; performing second data processing on the logging information to determine a reflection coefficient sequence; extracting seismic wavelets, convoluting the seismic wavelets with the reflection coefficient sequence, determining a synthetic seismic record of the target calibration object in a time domain, performing third data processing on the synthetic seismic record; determining a correlation between the seismic trace near well and the synthetic seismic record, determining a global time shift between the synthetic seismic record and the seismic trace near well, performing a preliminary alignment on the synthetic seismic record; and calculating a local time shift between the seismic trace near well and the synthetic seismic record and accurately calibrating th

Abstract: A plastic bearing for a steering column includes a housing, an inner race, and a middle race. A retainer and balls are arranged between the middle race and the inner race. An accommodating cavity is formed in the housing; the middle race is arranged in the accommodating cavity. Guide protrusions are arranged on an inner wall of the accommodating cavity. Two positioning protrusions are arranged on an outer wall of the middle race, and an insertion groove is formed between the two positioning protrusions. The guide protrusion is matched with the insertion groove. Buckles are arranged on the inner wall of the accommodating cavity. Clamping blocks are arranged on the outer wall of the middle race, and the clamping blocks are clamped in the buckles. The overall structure of the plastic bearing for a steering column is more compact and simple and can be easily and conveniently assembled.

Abstract: The present disclosure discloses a denoising method and a system for preserving amplitude variation with offset (AVO) features of pre-stack seismic data. The method includes: acquiring seismic wave data at at least one receiving point through a seismic signal acquisition device, and storing the seismic wave data in a memory; in response to ending of an acquisition operation of the seismic signal with the seismic signal acquisition device, determining, based on the seismic wave data in the memory, pre-denoising angle gather data through a processing device; and obtaining and outputting a denoised angle gather signal through inputting the pre-denoising angle gather data to a denoising device and performing denoising processing on the pre-denoising angle gather data based on the denoising device.