Abstract: Disclosed is a power unit used for a swimming pool cleaning machine and the swimming pool cleaning machine. The power unit includes an impeller and a water outlet channel communicated with the impeller. The water outlet channel includes a spiral portion, a linear flowing portion and a water outlet. The inlet of the impeller is communicated with a water, and the outlet of the impeller is communicated with the spiral portion. The linear flowing portion deflects to the outer side of the spiral direction of the spiral portion. A steering stressed portion is formed at the junction of the linear flowing portion and the spiral portion. The steering stressed portion and the spiral portion are respectively located on either sides of the center line of the water outlet. The water outlet direction of the water outlet is opposite to the traveling direction of the swimming pool cleaning machine.

Abstract: A swimming pool cleaner is provided, which includes a housing, a travelling device and a filter screen, two groups of power components with opposite driving directions are provided inside the water outlet chamber, the power component includes an impeller and a water outlet channel, wherein the water outlet channel includes a spiral portion and a linear flowing portion which are sequentially communicated, the linear flowing portion is connected with the water outlet, and the linear flowing portion deflects to the outer side in the spiral direction of the spiral portion, a steering stressed portion is formed at the junction of the linear flowing portion and the spiral portion, and the water outlet is in communication with an outside of the housing and faces towards a direction that is opposite to the travelling direction of the travelling device.

Abstract: A pipeline demagnetization device based on a permanent magnet structure includes a central piece and permanent magnets distributed on the central piece. A magnetic field with alternating directions is formed in a wall of a pipeline in an axial direction from front to back, and strength of the magnetic field gradually decreases. The pipeline demagnetization device can be applied to the pipeline demagnetization using a built-in structure or an externally-built structure. The pipeline demagnetization device spatially constructs a set of stable alternately-decayed magnetic fields, so that the wall of the pipeline experiences the set of alternately-decayed magnetic fields when the pipeline that is magnetized spatially displaces relative to the set of alternately-decayed magnetic fields, thereby realizing demagnetization.

Abstract: An electrogenerated chemiluminescence (ECL) probe is based on trititanium dicarbide two-dimensional (2D) metal carbide catalyzed luminol and a preparation method. The biosensor includes the probe and the electrode of the biosensor, wherein the probe includes the Ti3C2 MXenes nanosheets, a linker molecule and a bio-recognition molecule 1; the Ti3C2 MXenes nanosheets are linked with the linker molecule by electrostatic adsorption; the linker molecule is linked with the bio-recognition molecule 1 by an amide group, contains a primary or secondary amine group, and presents positive potential in water; the bio-recognition molecule 1 is a single-stranded DNA sequence 1 having a carboxyl group at the 5? end, and a CD63 protein on exosomes is recognized by the single-stranded DNA sequence 1. It was found for the first time that Ti3C2 MXenes can improve the ECL signal of luminol, the Ti3C2 MXenes could be applicable to the ECL probe.

Abstract: A pipeline demagnetization device based on a permanent magnet structure includes a central piece and permanent magnets distributed on the central piece. A magnetic field with alternating directions is formed in a wall of a pipeline in an axial direction from front to back, and strength of the magnetic field gradually decreases. The pipeline demagnetization device can be applied to the pipeline demagnetization using a built-in structure or an externally-built structure. The pipeline demagnetization device spatially constructs a set of stable alternately-decayed magnetic fields, so that the wall of the pipeline experiences the set of alternately-decayed magnetic fields when the pipeline that is magnetized spatially displaces relative to the set of alternately-decayed magnetic fields, thereby realizing demagnetization.

Abstract: The present invention relates to the technical field of wireless communication and of mobile communication, and more particularly to a method for spectrum resource allocation and interference avoidance of femtocell in a heterogeneous environment consisting of macro cell and femtocell, and specifically to a spectrum allocation method based on interference suppression and user difference bandwidth requirements. According to the spectrum allocation method based on interference suppression and user difference bandwidth requirements of the present invention, spectrum resource can be allocated reasonably according to the priority level of bandwidth requirements in combination with graph coloring algorithm and chromaticity preference algorithm.

Abstract: The present invention relates to the technical field of wireless communication and of mobile communication, and more particularly to a method for spectrum resource allocation and interference avoidance of femtocell in a heterogeneous environment consisting of macro cell and femtocell, and specifically to a spectrum allocation method based on interference suppression and user difference bandwidth requirements. According to the spectrum allocation method based on interference suppression and user difference bandwidth requirements of the present invention, spectrum resource can be allocated reasonably according to the priority level of bandwidth requirements in combination with graph coloring algorithm and chromaticity preference algorithm.