Abstract: The present disclosure provides a method for collecting liquid comprising: collecting the liquid, by a pump body mechanism, into a cavity of a suction tube assembly; monitoring, by a liquid-level sensing mechanism, an amount of the liquid collected in the cavity; controlling, by the liquid-level sensing mechanism, a start and a stop of collecting the liquid in response to the amount of the liquid collected in the cavity; and cleaning the cavity by delivering, by the pump body mechanism, water into the cavity in response to the stop of collecting the liquid.

Abstract: Provided is a focusing assembly including a focusing barrel and a barrel retaining ring; the focusing barrel includes a first sleeve, a second sleeve, and a third sleeve that are sequentially sleeved from inside to outside of the focusing barrel; the first sleeve is provided with a lens mounting portion for mounting a focusing lens, a first end of the second sleeve is provided with a display screen mounting portion for mounting a display screen, a second end of the second sleeve is detachably connected to the barrel retaining ring, the first end and the second end being opposite ends of the second sleeve; and the lens mounting portion and the display screen mounting portion are configured such that the relative position thereof in a focusing direction of the focusing assembly is adjustable.

Abstract: A virtual reality lens barrel assembly, a virtual reality device and a control method, belonging to the field of virtual reality technology is provided. The virtual reality lens barrel assembly includes a lens, a blocking mechanism and a lens barrel, the lens and the blocking mechanism are both located outside a first opening of the lens barrel, and a second opening of the lens barrel is configured to place a display assembly; and the blocking mechanism includes a through hole with a variable size, and an optical axis of the lens passes through a center of the through hole and the first opening.

Abstract: A preparation method of a polytetrafluoroethylene (PTFE)-based nano functional composite membrane and use is provided. The PTFE-based nano functional composite membrane can be applied to prevention and resistance of icing of various types of wind turbine generator blades in winter and salt spray corrosion resistance of wind turbine blades, in the meantime, can improve the aerodynamic performance of wind turbine blade airfoils and enhance the whole surface strength of the blade and protect the blade from undergoing aging erosion, and is a new-generation multi-functional brand-new composite membrane material which can be directly explored and applied to the industrial fields of preventing adhesion and corrosion of marine fouling organisms on steel pipe piles of offshore wind power and offshore platforms, avoiding snowing and icing of high-voltage transmission towers and cables, protecting snowing and icing of bridges (stay cables and suspension cables) and the like.

Abstract: A preparation method of a polytetrafluoroethylene (PTFE)-based membrane for preventing and removing ices covering wind turbine blades is provided and the method comprises: preparing a membrane into a PTFE rod material with polymerized monomers by using monomer polymerization methods such as blending, pre-compressing and pushing; making the membrane into a PTFE-based homogeneous membrane with micropores and nano and micron scale concave-convex geometrical ultra-structure morphologies under the condition that the membrane is cracked to generate a laminar exfoliated fabric-like structure in the hot calendaring process of the PTFE rod material by using a hot calendaring and fusion polymerization method; and applying the PTFE-based homogeneous membrane to blades of a large wind turbine in operation.

Abstract: The disclosure discloses a numerical simulation method of an influence of a polytetrafluoroethylene (PTFE)-based membrane on an aerodynamic characteristic of a wind turbine blade, and relates to the technical field of polymer composites. The simulation method comprises the following steps: selecting a wind turbine generator, a blade airfoil and a PTFE-based nano functional membrane; setting a numerical simulation computation network and a computation area of a wind energy capture area; determining main computation parameters and a Reynolds number for aerodynamic characteristic computation; establishing a geometrical model whose airfoil boundary extends by 0.26 mm (membrane thickness) along a normal direction to obtain a new computational geometry; computing by using a hydrodynamic computation method and a finite volume method; and obtaining an influence number simulation computation result.

Abstract: An optical module includes a lens barrel main housing, at least one dimming lens installed in the lens barrel main housing, a first cover assembly and a second cover assembly. Opposite ends of the lens barrel main housing are provided with a first opening and a second opening. The inner circumferential wall of the lens barrel main housing is provided with at least one limiting portion. Each dimming lens abuts against a limiting portion in the preset direction. The first cover assembly is arranged on the first opening and includes a light source configured to emit image beams to the at least one dimming lens. The second cover assembly is arranged on the second opening and includes a transparent component being capable of transmitting the image beams passing through the at least one dimming lens to an outside of the lens barrel main housing.

Abstract: The present disclosure provides an optical system and a near-eye display device. The optical system includes an optical waveguide and an eyepiece system. The eyepiece system is on a light incident side of the optical waveguide, and a light exit side of the eyepiece system is opposite to the light incident side of the optical waveguide so that light exited from the eyepiece system is incident on the optical waveguide. The eyepiece system includes a lens group which includes a first lens, a second lens and a third lens which are sequentially arranged in a direction parallel to the optical axis of the lens group; a side of the first lens away from the second lens is the light exit side of the eyepiece system, each of the first lens and the third lens has a positive focal power; and the second lens has a negative focal power.

Abstract: A virtual reality display device, a display device, and a calculation method of a line-of-sight angle are provided. The virtual reality display device includes: a display screen configured to display a picture to a user, at least one infrared light source, and an infrared camera; and the infrared camera is on a side of the display screen away from an eye of the user, and is configured to acquire an eye image of the eye of the user that is illuminated by the at least one infrared light source.

Abstract: A wearable device is provided which includes: a head-mounted display, a C-shaped wearing assembly matching a head contour of a human body, and a connection assembly, the C-shaped wearing assembly being made of a deformable material; wherein an end of the connection assembly is connected to an end of the C-shaped wearing assembly, the other end of the connection assembly is connected to the head-mounted display via a connection shaft, an axial line of the connection shaft passing through a center of gravity of the head-mounted display; wherein the other end of the C-shaped wearing assembly is snapping into the occipital bone of the human body, such that the head-mounted display fits with the face of the human body. The present disclosure may ensure that the head-mounted display in the wearable device is closely attached to the face of the user, thereby preventing light leakage, wearing comfortlessness, and etc.

Abstract: Provided is a focusing assembly including a focusing barrel and a barrel retaining ring; the focusing barrel includes a first sleeve, a second sleeve, and a third sleeve that are sequentially sleeved from inside to outside of the focusing barrel; the first sleeve is provided with a lens mounting portion for mounting a focusing lens, a first end of the second sleeve is provided with a display screen mounting portion for mounting a display screen, a second end of the second sleeve is detachably connected to the barrel retaining ring, the first end and the second end being opposite ends of the second sleeve; and the lens mounting portion and the display screen mounting portion are configured such that the relative position thereof in a focusing direction of the focusing assembly is adjustable.

Abstract: A VR lens structure and a display device are provided. The VR lens structure includes a first lens and a second lens disposed opposite to each other. The first lens is provided with a first side surface and a second side surface which are disposed opposite to each other, and at least one of the first side surface and the second side surface is an aspheric surface. The second lens is a Fresnel lens, a smooth surface of the second lens is disposed proximal to the second side surface, and a Fresnel surface of the second lens is disposed farther away from the second side surface than the smooth surface.

Abstract: The present disclosure relates to a near-eye display and a method for adjusting the brightness of a near-eye display. The near-eye display including a first display screen for displaying one of a left eye image and a right eye image, a second display screen for displaying the other of the left eye image and the right eye image, a detector configured to detect a first detected value indicating brightness of the first display screen and a second detected value indicating brightness of the second display screen, and a controller configured to adjust brightness of at least one of the first display screen and the second display screen based on the first detected value and the second detected value.

Abstract: The present disclosure provides an electronic apparatus, a spatial positioning system and a method thereof. The electronic apparatus includes: a body having a central region and a peripheral region surrounding the central region; and a plurality of signal receiving components disposed in the peripheral region of the body. The signal receiving component includes a circuit board and a plurality of signal receiving devices located on the circuit board.

Abstract: A virtual reality display device, a display device, and a calculation method of a line-of-sight angle are provided. The virtual reality display device includes: a display screen configured to display a picture to a user, at least one infrared light source, and an infrared camera; and the infrared camera is on a side of the display screen away from an eye of the user, and is configured to acquire an eye image of the eye of the user that is illuminated by the at least one infrared light source.

Abstract: The present disclosure relates to a near-eye display and a method for adjusting the brightness of a near-eye display. The near-eye display including a first display screen for displaying one of a left eye image and a right eye image, a second display screen for displaying the other of the left eye image and the right eye image, a detector configured to detect a first detected value indicating brightness of the first display screen and a second detected value indicating brightness of the second display screen, and a controller configured to adjust brightness of at least one of the first display screen and the second display screen based on the first detected value and the second detected value.

Abstract: A self-locking mechanism includes: a housing having a through hole and a dodge hole; an elastic member in the dodge hole, the elastic member being connected to a wall of the dodge hole and having a free end capable of swinging in a thickness direction of the housing; a first engaging member on the elastic member; a knob on an outer side of the housing and having one end passing through the through hole; a plurality of second engaging members on a side of the knob adjacent to the housing; wherein the first engaging member may be engaged with or disengaged from one of the second engaging members under an action of an elastic deformation of the elastic member as the knob rotates; and a driven member on an inner side of the housing and fixedly connected with the knob so as to be rotated under driving of the knob.

Abstract: The present disclosure provides an optical system and a near-eye display device. The optical system includes an optical waveguide and an eyepiece system. The eyepiece system is on a light incident side of the optical waveguide, and a light exit side of the eyepiece system is opposite to the light incident side of the optical waveguide so that light exited from the eyepiece system is incident on the optical waveguide. The eyepiece system includes a lens group which includes a first lens, a second lens and a third lens which are sequentially arranged in a direction parallel to the optical axis of the lens group; a side of the first lens away from the second lens is the light exit side of the eyepiece system, each of the first lens and the third lens has a positive focal power; and the second lens has a negative focal power.

Abstract: A wearable device is provided which includes: a head-mounted display a C-shaped wearing assembly matching a head contour of a human body, and a connection assembly, the C-shaped wearing assembly being made of a deformable material; wherein an end of the connection assembly is connected to an end of the C-shaped wearing assembly, the other end of the connection assembly is connected to the head-mounted display via a connection shaft, an axial line of the connection shaft passing through a center of gravity of the head-mounted display; wherein the other end of the C-shaped wearing assembly is snapping into the occipital bone of the human body, such that the head-mounted display fits with the face of the human body. The present disclosure may ensure that the head-mounted display in the wearable device is closely attached to the face of the user, thereby preventing light leakage, wearing comfortlessness, and etc.

Abstract: An object distance adjusting apparatus includes a first adjustment mechanism, a second adjustment mechanism, and a third adjustment mechanism, the first adjustment mechanism being meshed with the second adjustment mechanism, and the second adjustment mechanism being meshed with the third adjustment mechanism. Rotation of the first adjustment mechanism drives the second adjustment mechanism to rotate, and rotation of the second adjusting mechanism drives the third adjusting mechanism to rotate. A rotation axis of the third adjustment mechanism is perpendicular to both a rotation axis of the first adjustment mechanism and a rotation axis of the second adjustment mechanism. A virtual reality device including the object distance adjusting apparatus is also disclosed.