Abstract: An electromagnetic field simulation method based on subgridding technique and one-step alternating-direction-implicit-finite-difference time-domain (ADI-FDTD) algorithm is provided herein. The method includes establishing an electromagnetic field simulation model by setting an absorption boundary condition, a periodic boundary condition, a total field boundary condition and a scattering field boundary condition based on the one-step ADI-FDTD algorithm, subgridding technique and FDTD algorithm. The electromagnetic field simulation model is configured to select a detection point and a detection surface, obtain a time-domain waveform diagram of a reflection field of a simulation area, a time-domain waveform diagram of a transmission field of the simulation area and frequency-domain information of the simulation area, and simulate an electromagnetic field, by the electromagnetic field simulation model.

Abstract: The present disclosure provides a synthetic aperture radar (SAR) image target detection method. The present disclosure takes the anchor-free target detection algorithm YOLOX as the basic framework, reconstructs the backbone feature extraction network from the lightweight perspective, and replaces the depthwise separable convolution in MobilenetV2 with one ordinary convolution and one depthwise separable convolution. The number of channels in the feature map is reduced by half through the ordinary convolution, features input from the ordinary convolution are further extracted by the depthwise separable convolution, and the convolutional results from the two convolutions are spliced. The present disclosure highlights the unique strong scattering characteristic of the SAR target through the attention enhancement pyramid attention network (CSEMPAN) by integrating channels and spatial attention mechanisms.

Abstract: Described is a broadband near infrared absorber, including a wide-type cross-shaped gold layer, an indium tin oxide (ITO) thin film, a silicon dioxide (SiO2) layer and a hollowed-out cross-shaped gold layer arranged from top to bottom. A length of the cross-shaped gold layer is the same as a length of the hollowed-out cross-shaped gold layer. A width of the cross-shaped gold layer is the same as a width of the hollowed-out cross-shaped gold layer. A thickness of the cross-shaped gold layer is different from a thickness of the hollowed-out cross-shaped gold layer.

Abstract: The present disclosure provides a 5th generation (5G) broadband dual-polarized base station antenna of a multimode resonance structure, including: a first resonance structure, a main radiating unit, a feed balun set, and a metal reflecting plate, where the feed balun set is disposed on the metal reflecting plate, the main radiating unit is disposed on a first feed balun and a second feed balun, and the first resonance structure is disposed on the main radiating unit; the main radiating unit includes a second resonance structure and a third resonance structure, the first resonance structure is configured to control a resonance point at a high frequency, and the third resonance structure is configured to control a resonance point at a low frequency; and the feed balun set is configured to provide a balance current for the main radiating unit and the first resonance structure.

Abstract: A terahertz sensor based on a dielectric metasurface, including a sensing element, and a thermosensitive circuit connected to the sensing element. The sensing element is composed of a cylindrical semiconductor doped with a conductive material. The conductive material is configured to change conductivity of the cylindrical semiconductor to enable the cylindrical semiconductor to absorb electromagnetic waves in terahertz region.

Abstract: This disclosure provides a perovskite light-emitting diode with an adjustable light field, including a glass layer, an anode, a hole transport layer, an emission layer, an electron transport layer and a cathode in sequence from top to bottom. The electron transport layer is provided with a periodic nano-grating structure.

Abstract: An exercise device including a base plate having a generally circular wall extending upwardly therefrom to define a base body having an interior cavity. Spaced apart roller assemblies are disposed within an interior of the base body. A generally convex dome of a motion platform assembly is at least partially disposable within the base body so as to contact the roller assemblies. The motion platform assembly slides, tilts or rotates as force is applied to an upper support platform. A lip of the motion platform assembly may contact a rim of the wall to limit a range of motion of the motion platform assembly. One or more elastic cords extending between the base body and the motion platform assembly provide resistance to motion of the platform assembly.

Abstract: A lithium (Li) ion battery includes a first electrode with a second electrode, and a shutdown polymer additive on an outer surface of the first electrode. The shutdown polymer additive includes at least two polyethylene layers, each polyethylene layer comprising a plurality of polyethylene microspheres. Each polyethylene microsphere is wrapped with carbon nanotubes. The polyethylene microspheres interconnect with each other such that the carbon nanotubes form a conductive network. The polyethylene layers are provided at predetermined areas of the outer surface of the first electrode.

Abstract: An exercise device including a base plate having a generally circular wall extending upwardly therefrom to define a base body having an interior cavity. Spaced apart roller assemblies are disposed within an interior of the base body. A generally convex dome of a motion platform assembly is at least partially disposable within the base body so as to contact the roller assemblies. The motion platform assembly slides, tilts or rotates as force is applied to an upper support platform. A lip of the motion platform assembly may contact a rim of the wall to limit a range of motion of the motion platform assembly. One or more elastic cords extending between the base body and the motion platform assembly provide resistance to motion of the platform assembly.

Abstract: A lithium (Li) ion battery includes a first electrode with a second electrode, and a shutdown polymer additive on an outer surface of the first electrode. The shutdown polymer additive includes at least two polyethylene layers, each polyethylene layer comprising a plurality of polyethylene microspheres. Each polyethylene microsphere is wrapped with carbon nanotubes. The polyethylene microspheres interconnect with each other such that the carbon nanotubes form a conductive network. The polyethylene layers are provided at predetermined areas of the outer surface of the first electrode.