Abstract: Disclosed are a method and a related device for determining a development status of a separation layer in a coal mine. The method includes: obtaining surface subsidence variation data of the coal mine within a preset time interval, rock stress variation data of a caving zone of the coal mine and water pressure variation data; determining a height decrease of the caving zone based on the rock stress variation data and the water pressure variation data; and determining the development status of the separation layer of the coal mine based on the height decrease and the surface subsidence variation data.

Abstract: Aspects of this disclosure relate transmitting and/or receiving reference symbols. A first reference symbol includes a symbol and a cyclically shifted portion of the symbol, where the cyclically shifted portion has cyclic shift length. A second reference symbol includes a cyclically shifted version of the first reference symbol that is cyclically shifted relative to the first reference symbol by the cyclic shift length. The first and second reference symbols are transmitted consecutively from at least one antenna.

Abstract: The present disclosure provides a fly-eye lens module, a lighting device, and a DLP optical engine. The fly-eye lens module includes a first plastic fly-eye lens, a second plastic fly-eye lens, and a glass triangular prism structure. The first plastic fly-eye lens is provided on a surface thereof with a first circular region, and the second plastic fly-eye lens is provided on a surface thereof with a second circular region. The first and the second circular regions are both configured as a fly-eye structure having a concave-convex structure, and are respectively fixed to two sides of the cuboid glass structure by a bonding agent. The second and the first plastic fly-eye lenses are disposed such that the light spot emitted from the point light source is incident to the fly-eye lens module via the first plastic fly-eye lens, and is emitted from the second plastic fly-eye lens.

Abstract: Aspects of this disclosure relate receiving a reference symbol from at least one antenna. The reference symbol includes a portion of a first transmitted reference symbol and a portion of a second transmitted reference symbol. The first transmitted reference symbol includes a symbol and a cyclically shifted portion of the symbol having a cyclic shift length. The second transmitted reference symbol includes a cyclically shifted version of the first transmitted reference symbol that is cyclically shifted relative to the first transmitted reference symbol by the cyclic shift length. The reference symbol is processed. In certain embodiments, processing the reference symbol can account for (i) a frame offset between uplink symbols and downlink symbols and (ii) another timing offset between downlink transmission and uplink reception.

Abstract: The present application provides a method, a device, and an apparatus for assembling a prism. The method includes: acquiring scanned data by scanning a space where the prism and the fitting body are disposed in response to the prism being placed at a first predetermined station and the fitting body being placed at a second predetermined station; generating a physical 3D model by three-dimensional reconstruction on the prism, the fitting body, and the space based on the scanned data; acquiring comparison data by comparing the physical 3D model with a theoretic 3D model, wherein the theoretic 3D model is a theoretic model for fitting the prism to the fitting body; and controlling, based on the comparison data, a manipulator to fit the prism at the first predetermined station to the fitting body at the second predetermined station.

Abstract: The present disclosure provides a fly-eye lens module, a lighting device, and a DLP optical engine. The fly-eye lens module includes a first plastic fly-eye lens, a second plastic fly-eye lens, and a glass triangular prism structure. The first plastic fly-eye lens is provided on a surface thereof with a first circular region, and the second plastic fly-eye lens is provided on a surface thereof with a second circular region. The first and the second circular regions are both configured as a fly-eye structure having a concave-convex structure, and are respectively fixed to two sides of the cuboid glass structure by a bonding agent. The second and the first plastic fly-eye lenses are disposed such that the light spot emitted from the point light source is incident to the fly-eye lens module via the first plastic fly-eye lens, and is emitted from the second plastic fly-eye lens.

Abstract: Embodiments of the present disclosure relate to an apparatus for assembling a prism, and a production facility. The apparatus includes: a first station, configured for placement of the prism; a second station, configured for placement of a fitting body; a manipulator, configured to grasp the prism; a first drive unit, connected to the manipulator, and configured to drive the manipulator to be lifted or lowered; and a second drive unit, connected to the first drive unit, and configured to drive the first drive unit to reciprocate between the first station and the second station; a clamping device, disposed in the mounting slot of the fitting body, and configured to clamp the prism; and a controller, connected to the manipulator, the first drive unit, and the second drive unit.

Abstract: A lens focus adjustment assembly and a projector are provided. The focus adjustment assembly includes: a barrel, including a barrel body and a limiting structure, the barrel body defining a receiving space, the barrel body being provided with a channel; a focus adjustment ring, sleeved onto the barrel body and provided with a groove; and a motion assembly, including a support member and a mating member, wherein the support member is configured to fix a lens and positioned in the receiving space, and the mating member extends from the support member and runs through the channel and mates with the groove. When the focus adjustment ring rotates about the barrel body, the groove mates with the mating member and drives the mating member to move back and forth along the channel, and the mating member meanwhile drives the support member to move along the axial line.

Abstract: The present disclosure provides a focusing device and a photographic apparatus. The focusing device includes a lens assembly, a first motor, a second motor, and a motor control board. The lens assembly includes a lens. The first motor and the second motor are respectively disposed on two opposite sides of the lens assembly. The motor control board is fixedly disposed on a side of the lens assembly, and controls the two motors to rotate, such that the first motor and the second motor drive the lens to move.

Abstract: Aspects of this disclosure relate transmitting and/or receiving reference symbols. A first reference symbol includes a symbol and a cyclically shifted portion of the symbol, where the cyclically shifted portion has cyclic shift length. A second reference symbol includes a cyclically shifted version of the first reference symbol that is cyclically shifted relative to the first reference symbol by the cyclic shift length. The first and second reference symbols are transmitted consecutively from at least one antenna.

Abstract: Aspects of this disclosure relate receiving a reference symbol from at least one antenna. The reference symbol includes a portion of a first transmitted reference symbol and a portion of a second transmitted reference symbol. The first transmitted reference symbol includes a symbol and a cyclically shifted portion of the symbol having a cyclic shift length. The second transmitted reference symbol includes a cyclically shifted version of the first transmitted reference symbol that is cyclically shifted relative to the first transmitted reference symbol by the cyclic shift length. The reference symbol is processed. In certain embodiments, processing the reference symbol can account for (i) a frame offset between uplink symbols and downlink symbols and (ii) another timing offset between downlink transmission and uplink reception.

Abstract: A lens module and a projection device are provided. The lens module includes a sleeve, a lens barrel and a locking ring, wherein an end of the sleeve is provided with a deformable conical protrusion; an end of the lens barrel is received in the sleeve through the end of the sleeve; and the locking ring is nested on an outer side of the end of the sleeve, and an inner surface of the locking ring is provided with a conical structure mating with the conical protrusion.

Abstract: A built-in motor for a bicycle and an electric powered bicycle are provided. The built-in motor includes: a motor shell, a motor inner stator fixed in the motor shell by means of an inner stator frame; a motor outer rotor is installed on the inner stator frame, the motor outer rotor and a motor body output shaft being connected into a whole; a first planetary gear mechanism arranged in the inner stator frame, and the first planetary gear mechanism being used for increasing input human force before outputting the same; a ring gear of the first planetary gear mechanism is connected with an elastic body, the elastic body being fixedly arranged in the inner stator frame; a torque sensor is arranged on the elastic body, the torque sensor being used for measuring the pedaling force provided by a rider to the bicycle.

Abstract: A built-in motor for a bicycle and an electric powered bicycle are provided. The built-in motor includes: a motor shell, a motor inner stator fixed in the motor shell by means of an inner stator frame; a motor outer rotor is installed on the inner stator frame, the motor outer rotor and a motor body output shaft being connected into a whole; a first planetary gear mechanism arranged in the inner stator frame, and the first planetary gear mechanism being used for increasing input human force before outputting the same; a ring gear of the first planetary gear mechanism is connected with an elastic body, the elastic body being fixedly arranged in the inner stator frame; a torque sensor is arranged on the elastic body, the torque sensor being used for measuring the pedaling force provided by a rider to the bicycle.

Abstract: A torque sensor system, a torque signal measuring method and an electric power-assisted bicycle, related to the technical field of transportation, solving the technical problem of current torque sensor systems generally needing a power input shaft to rotate in order to accurately measure stepping force provided by a rider.

Abstract: A computer-executable method, computer program product and system for managing metadata in a distributed data storage system, wherein the distributed data storage system includes a first node and one or more data storage arrays, the computer-executable method, computer program product and system comprising partitioning management of metadata created in the distributed data storage system into one or more portions of metadata, wherein the first node manages a first portion of the one or more portions of metadata, and storing the metadata using the first node.

Abstract: The present invention discloses a cover including a base, a patterned layer, a protective layer and a bottom layer. The base has a first surface, and a second surface on the opposite side of the first surface. The patterned layer is formed on the first surface of the base. The protective layer and the bottom layer are integrally formed on the second surface of the base and on the patterned layer respectively by injection molding. The present invention also provides a method for manufacturing a cover. The present cover can tend give a various and vivid appearances whilst also having good performance.