Abstract: A vertical axis wind turbine includes a support axis and a wind wheel. The wind wheel includes a rotation base, plural rotation stand sets, plural deflection structures, plural blades, and plural deflection-limiting structures corresponding to the plural blades. The rotation base is rotatably disposed on the support axis. The plural rotation stand sets may define a rotation plane. A first end of each rotation stand set is fixedly disposed on the rotation base. Each blade is pivotally coupled to a second end of the corresponding rotation stand set through the corresponding deflection structure. Consequently, an angle of attack of the blade in an airflow is correspondingly adjusted. When one of the plural blades is deflected, the corresponding deflection-limiting structure generates a first rotational torque in a first rotating direction or a second rotational torque in a second rotating direction so as to rotate the rotation base.

Abstract: A liquid level measuring device includes a container and a digital electronic device. The container is located at a detection region. The container has an opening, so that a liquid is permitted to flow into the container through the opening. The digital electronic device is combined with the container. The digital electronic device includes a lens, and an optical axis of the lens is directed to and perpendicular to a detection plane. A light source illuminates the detection plane. The lens is operated in a fixed-focus mode to shoot the detection plane to acquire an image stream. Each image frame of the image stream contains a corresponding liquid surface image. After an image analyzing operation is performed on the corresponding liquid surface image to calculate the corresponding liquid surface image, a liquid level of the liquid is realized.

Abstract: A vertical axis wind turbine includes a support axis and a wind wheel. The wind wheel includes a rotation base, plural rotation stand sets, plural deflection structures, plural blades, and plural deflection-limiting structures corresponding to the plural blades. The rotation base is rotatably disposed on the support axis. The plural rotation stand sets may define a rotation plane. A first end of each rotation stand set is fixedly disposed on the rotation base. Each blade is pivotally coupled to a second end of the corresponding rotation stand set through the corresponding deflection structure. Consequently, an angle of attack of the blade in an airflow is correspondingly adjusted. When one of the plural blades is deflected, the corresponding deflection-limiting structure generates a first rotational torque in a first rotating direction or a second rotational torque in a second rotating direction so as to rotate the rotation base.

Abstract: A warning device includes a lighting unit, an image capturing unit and a processing unit. The lighting unit is configured for generating at least one light spot. The image capturing unit is configured for capturing and recording a series of images of the light spot in time sequence. The processing unit is coupled to the image capturing unit for analyzing a position of the light spot in each of the images, computing an overall displacement of the light spot according to the positions in the respective images, determining whether the overall displacement is greater than a predetermined safe value, and generating a warning output when the overall displacement is greater than the predetermined safe value.

Abstract: A particle image-capturing method includes controlling a light-emitting diode unit to emit light so as to illuminate a fluid through an annular condenser, particles in which scattering the light, and controlling an image-capturing unit to capture images of the scattered light through a microscope. A micro particle image velocimetry that performs the method is also disclosed.

Abstract: A particle image-capturing method includes controlling a light-emitting diode unit to emit light so as to illuminate a fluid through an annular condenser, particles in which scattering the light, and controlling an image-capturing unit to capture images of the scattered light through a microscope. A micro particle image velocimetry that performs the method is also disclosed.