Abstract: A pressure washer includes a housing formed with a battery holder and a drive compartment; a battery pack accommodated in the battery holder; a control board disposed in the housing; a drive assembly disposed in the drive compartment and including a pump and an electric motor for driving the pump; and a water gun connected to the pump through a water pipe. The housing is provided with an air inlet and an air outlet, a heat dissipation air path is formed between the air inlet and the air outlet, the heat dissipation air path is located inside the housing, and from the air inlet to the air outlet, the battery holder and the control board are located on the heat dissipation air path in sequence.

Abstract: A grass trimmer includes a grass trimmer head, a drive device, and an operating member. The grass trimmer head includes a spool used for a grass trimmer rope to be wound around and a head housing for accommodating at least part of the spool. The drive device is configured to drive the grass trimmer head to rotate. The operating member is connected to the drive device and includes an operating portion for a user to operate. The grass trimmer has a winding mode. In the case where the grass trimmer is in the winding mode, movement of the operating member is transmitted to the spool or the head housing through the drive device so as to generate relative movement that is between the spool and the head housing and through which the grass trimmer rope is wound around the spool.

Abstract: The disclosure relates to the technical field of batteries, and in particular to a battery pack and an electrical device. The battery pack includes: a plurality of battery cells, any of which is provided with a fragile portion; and a spray pipeline, which is arranged on one side of the battery cell where the fragile portion is arranged. The spray pipeline is provided with an injection portion, and the injection portion abuts against the fragile portion. The fragile portion is impacted by a thermal runaway heat flow of the battery cell to form a pressure relief port, and the injection portion forms an injection port under the action of the thermal runaway heat flow, so that the cooling medium in the spray pipeline flows out from the injection port.

Abstract: The present invention discloses a resilience-enhanced simulation method for container logistics supply chain based on adaptive fuzzy double feedback, specific steps comprising: applying a container logistics supply chain system to simulate the impact of adverse events; Designing a two-dimensional resilience index to measure the overall resilience of the container logistics supply chain system; Based on this simulation system, an adaptive fuzzy dual feedback control structure is established and a resilience enhanced method is proposed, so that the output of unfinished container operations affected by adverse events converge to zero quickly. By simulating the supply chain system under step demand, the effectiveness of the resilience enhanced control method of container logistics supply chain is verified.

Abstract: A battery assembly and an assembling method of the assembled battery are provided. The assembled battery includes a first battery, a second battery, and a busbar. The first battery includes a first post assembly. The second battery includes a second post assembly. The busbar is bent into a first section, a second section, and a third section. The first section is connected to the first post assembly, and the third section is connected to the second post assembly. The busbar is an integrated U-shaped structure.

Abstract: A grass trimmer includes a grass trimmer head, a drive device, and an operating member. The grass trimmer head includes a spool used for a grass trimmer rope to be wound around and a head housing for accommodating at least part of the spool. The drive device is configured to drive the grass trimmer head to rotate. The operating member is connected to the drive device and includes an operating portion for a user to operate. The grass trimmer has a winding mode. In the case where the grass trimmer is in the winding mode, movement of the operating member is transmitted to the spool or the head housing through the drive device so as to generate relative movement that is between the spool and the head housing and through which the grass trimmer rope is wound around the spool.

Abstract: A device and method of enhancing terahertz wave signals based on a hollow metal waveguide are disclosed. Simple devices such as a beam splitter, multiple plane mirrors, a beam combiner and an adjustable delay system are used. Two laser beams having a wavelength of 800 nm split by the beam splitter generate a fixed time phase delay, and are converged in the hollow metal waveguide to sequentially overlap with pulse of a laser having a wavelength of 400 nm for nonlinear interaction to ionize gas in the optical fiber to generate terahertz waves. The hollow metal waveguide can converge and transmit the generated terahertz waves due to its total reflection characteristics.

Abstract: Disclosed is a method of enhancing absorption spectral signals of a biological sample in a terahertz waveband in which the biological sample are embedded and supported with black silicon. In the method, the biological sample are filled between the surface micro-nano structures of a black silicon material and then freeze-dried. When the terahertz wave is incident upon the black silicon material, multiple reflections will occur between the micro-nano structures, so that the terahertz wave passes through the biological sample multiple times to increase the distance of interaction between the terahertz waves and the biological sample, allowing for enhanced absorption spectral signals of the biological sample and improved identifiability of the biological sample. The method is simple and easy to implement and low in cost.

Abstract: A device and method of enhancing terahertz wave signals based on a hollow metal waveguide are disclosed. Simple devices such as a beam splitter, multiple plane mirrors, a beam combiner and an adjustable delay system are used. Two laser beams having a wavelength of 800 nm split by the beam splitter generate a fixed time phase delay, and are converged in the hollow metal waveguide to sequentially overlap with pulse of a laser having a wavelength of 400 nm for nonlinear interaction to ionize gas in the optical fiber to generate terahertz waves. The hollow metal waveguide can converge and transmit the generated terahertz waves due to its total reflection characteristics.

Abstract: Disclosed is a method of enhancing absorption spectral signals of a biological sample in a terahertz waveband in which the biological sample are embedded and supported with black silicon. In the method, the biological sample are filled between the surface micro-nano structures of a black silicon material and then freeze-dried. When the terahertz wave is incident upon the black silicon material, multiple reflections will occur between the micro-nano structures, so that the terahertz wave passes through the biological sample multiple times to increase the distance of interaction between the terahertz waves and the biological sample, allowing for enhanced absorption spectral signals of the biological sample and improved identifiability of the biological sample. The method is simple and easy to implement and low in cost.