Abstract: A height measurement system includes: a first fixed assembly, configured to connect to an external fixing part so that the height measurement system is fixed on the external fixing part for use; a head plate, configured to move downwards from the first fixed assembly to the head of a user; a second fixed assembly, disposed on the head plate and being movable along with the heat plate; a digital tape measure, comprising a mounting assembly and a tape disposed in the mounting assembly, one of the mounting assembly and the tape head being attached to the first fixing assembly and the other to the second fixing assembly; a memory storing a standard height value of the first fixed assembly; and a data acquisition unit, configured to acquire a first tensile length of the tape when the head plate moves from the first fixed assembly to the user's head.

Abstract: A control device including a first shell; a battery pack mounting part; a first control unit, which is provided in the first shell and is used for cutting off power transmission from a battery pack to an electric power tool when the battery pack is abnormal; a first user operation unit, which is arranged on the first shell and is operated by a user to control the electric power tool; and a first interface, electrically connected to the first user operation unit. An electric power tool system comprises the control device and the electric power tool. The control device can be adapted to different types of electric power tools, and the control device is not provided with a control portion used for adjusting working parameter of the electric power tool, such that the control device can more flexibly match an upgraded new electric power tool.

Abstract: A 3D measurement model and the spatial calibration method based on a 1D displacement sensor are proposed. A 3D measurement system based on a fixed 1D displacement sensor is established; then a spatial measurement model based on the 1D displacement sensor is established; and then based on the high precision pose data of the measurement plane and sensor measurement data, spatial calibration constraint equation are established; a weighted iterative algorithms is employed to calculate the extrinsic parameters of the 1D sensor that meet the precision requirements, then the calibration process is completed. A high precision 3D measurement model is established; a 3D measurement model based on a 1D displacement sensor is established, and the calibration method of the measurement model is proposed, which will improve the precision of the 3D measurement model and solve the problem of inaccurate spatial measurement caused by the errors of the sensor extrinsic parameters.

Abstract: A lamp is provided. The lamp may include: a housing, a guide rail clamp, arranged on the housing, the guide rail clamp including a first sliding block and a second sliding block that are arranged at intervals, the first sliding block being detachably arranged on the housing, a connecting component, the connecting component being in connection with the first sliding block to fix the first sliding block on the housing, the connecting component forming an assembling unit jointly with the first sliding block, a positioning structure, including a positioning piece and a positioning hole, the positioning piece being arranged on one of the housing and the assembling unit, the positioning hole being arranged on another of the housing and the assembling unit, and the positioning piece being inserted into the positioning hole when the assembling unit moves to an assembling position.

Abstract: A display method and an electronic device are applied to an electronic device having a display. The method includes: displaying a first interface of a first application; detecting a first operation of a user; displaying, in response to the first operation, the first interface in a first area of the display, and displaying a second interface in a second area of the display; detecting a second operation of the user; and saving, in response to the second operation, a first image corresponding to the first interface, and displaying a thumbnail of the first image on the second interface.

Abstract: A control device including a first shell; a battery pack mounting part; a first control unit, which is provided in the first shell and is used for cutting off power transmission from a battery pack to an electric power tool when the battery pack is abnormal; a first user operation unit, which is arranged on the first shell and is operated by a user to control the electric power tool; and a first interface, electrically connected to the first user operation unit. An electric power tool system comprises the control device and the electric power tool. The control device can be adapted to different types of electric power tools, and the control device is not provided with a control portion used for adjusting working parameter of the electric power tool, such that the control device can more flexibly match an upgraded new electric power tool.

Abstract: A lamp is provided. The lamp may include: a housing, a guide rail clamp, arranged on the housing, the guide rail clamp including a first sliding block and a second sliding block that are arranged at intervals, the first sliding block being detachably arranged on the housing, a connecting component, the connecting component being in connection with the first sliding block to fix the first sliding block on the housing, the connecting component forming an assembling unit jointly with the first sliding block, a positioning structure, including a positioning piece and a positioning hole, the positioning piece being arranged on one of the housing and the assembling unit, the positioning hole being arranged on another of the housing and the assembling unit, and the positioning piece being inserted into the positioning hole when the assembling unit moves to an assembling position.

Abstract: Provided is a surfactant of structure (I), wherein m is a value in a range of 3 to 10, n is a value in a range of 3 to 20 and z is a value in a range of 1 to 3. Said surfactant is useful as a biodegradable low foaming surfactant.

Abstract: A telescopic baton is provided. The telescopic baton comprises a plurality of tubes sequentially arranged in an embedded manner, wherein a tube on an inner side of two adjacent tubes in the plurality of tubes is capable of extending and withdrawing along an axis direction of a tube on an outer side of the two adjacent tubes, a locking groove is formed in an inner wall of a first end of the tube on the outer side; a blade cam locking assembly, which comprises a socket sleeve, a plurality of blade cam blocks, a torsional spring and a fixing mechanism, wherein both extended ends of the torsional spring are respectively abutted against the socket sleeve and the blade cam block; an unlocking structure, which is mounted inside a tube on an outermost side of the plurality of tubes, and is used for unlocking the blade cam locking assembly.

Abstract: Some embodiments of the disclosure provide an expandable baton, which includes a plurality of sleeves, a positioning ring, a plurality of locking pieces and an unlocking rod, wherein the plurality of sleeves are retractably disposed in sequence in a nesting manner; the positioning ring is provided with an avoiding hole; the plurality of locking pieces are disposed at intervals around a peripheral side of the positioning ring and enclose an avoiding space, first axial ends of the plurality of locking pieces extend into the sleeve positioned on an inner side, and second axial ends of the plurality of locking pieces extend out of the sleeve positioned on the inner side and are stuck in a sleeve, positioned on an outer side, of the two adjacent sleeves to lock two adjacent sleeves in an extending state.

Abstract: A telescopic baton is provided. The telescopic baton comprises a plurality of tubes sequentially arranged in an embedded manner, wherein a tube on an inner side of two adjacent tubes in the plurality of tubes is capable of extending and withdrawing along an axis direction of a tube on an outer side of the two adjacent tubes, a locking groove is formed in an inner wall of a first end of the tube on the outer side; a blade cam locking assembly, which comprises a socket sleeve, a plurality of blade cam blocks, a torsional spring and a fixing mechanism, wherein both extended ends of the torsional spring are respectively abutted against the socket sleeve and the blade cam block; an unlocking structure, which is mounted inside a tube on an outermost side of the plurality of tubes, and is used for unlocking the blade cam locking assembly.

Abstract: Some embodiments of the disclosure provide an expandable baton, which includes a plurality of sleeves, a positioning ring, a plurality of locking pieces and an unlocking rod, wherein the plurality of sleeves are retractably disposed in sequence in a nesting manner; the positioning ring is provided with an avoiding hole; the plurality of locking pieces are disposed at intervals around a peripheral side of the positioning ring and enclose an avoiding space, first axial ends of the plurality of locking pieces extend into the sleeve positioned on an inner side, and second axial ends of the plurality of locking pieces extend out of the sleeve positioned on the inner side and are stuck in a sleeve, positioned on an outer side, of the two adjacent sleeves to lock two adjacent sleeves in an extending state.

Abstract: A multi-dimensional vibration control method based on piezoelectric ceramic actuator applied to wind tunnel test of aircraft model. The pitch and yaw acceleration sensors arranged on the center of mass of the aircraft model are used to measure the two components of the main vibration acceleration of the aircraft model, and the main vibration vector of the aircraft model is obtained and the real-time vibration plane of the strut is determined. Inertia is introduced to solve the dynamic bending moment on the active section of the multi-dimensional vibration damper, and then the stress distribution on the active section is obtained. The multi-dimensional active vibration control system is adopted to improve the stability and reliability of the active vibration control system of wind tunnel model, extend the service life of piezoelectric ceramic actuator, and ensure the quality of wind tunnel test data and the safety of wind tunnel test.

Abstract: A 3D measurement model and the spatial calibration method based on a 1D displacement sensor are proposed. A 3D measurement system based on a fixed 1D displacement sensor is established; then a spatial measurement model based on the 1D displacement sensor is established; and then based on the high precision pose data of the measurement plane and sensor measurement data, spatial calibration constraint equation are established; a weighted iterative algorithms is employed to calculate the extrinsic parameters of the 1D sensor that meet the precision requirements, then the calibration process is completed. A high precision 3D measurement model is established; a 3D measurement model based on a 1D displacement sensor is established, and the calibration method of the measurement model is proposed, which will improve the precision of the 3D measurement model and solve the problem of inaccurate spatial measurement caused by the errors of the sensor extrinsic parameters.

Abstract: A multi-dimensional vibration control method based on piezoelectric ceramic actuator applied to wind tunnel test of aircraft model. The pitch and yaw acceleration sensors arranged on the center of mass of the aircraft model are used to measure the two components of the main vibration acceleration of the aircraft model, and the main vibration vector of the aircraft model is obtained and the real-time vibration plane of the strut is determined. Inertia is introduced to solve the dynamic bending moment on the active section of the multi-dimensional vibration damper, and then the stress distribution on the active section is obtained. The multi-dimensional active vibration control system is adopted to improve the stability and reliability of the active vibration control system of wind tunnel model, extend the service life of piezoelectric ceramic actuator, and ensure the quality of wind tunnel test data and the safety of wind tunnel test.

Abstract: The present disclosure relates to use of daphnetin in preparation of composition for improving cognitive ability, particularly discloses use of daphnetin in preparation of a composition for preventing or treating disorders caused by increased ?-amyloid level, and use of daphnetin as an inhibitor of ?-amyloid. The present disclosure also relates to use of daphnetin in preparation of a composition for preventing or treating cognitive disorders, which are the Alzheimer's disease and Parkinson's disease.

Abstract: Provided is a knife, including: blade; a first hilt assembly; a second hilt assembly, the blade being detachably disposed between the first hilt assembly and the second hilt assembly; a connecting portion, disposed on the first hilt assembly; and a handle clip, disposed on the second hilt assembly, wherein a position of the connecting portion is adjustable, such that the connecting portion has a locking position connected to the handle clip and an opening position separated from the handle clip. The knife of the present disclosure solves the problem in the related technology that it is more complicated to disassemble blade of a knife.

Abstract: Disclosed embodiments relate to a handle and a knife. In some embodiments, the handle includes: a handle body, a locating portion is provided on the handle body; and a handle clamp, the handle clamp including a first clamping arm, a second clamping arm and a connecting portion, the connecting portion is provided between the first clamping arm and the second clamping arm, and the first clamping arm is movably provided on the handle body and enables the handle clamp with a retraction position and an extension position. Some embodiments solve the problems in the prior art that a handle is prone to slide off from a pocket due to a bad fit between the handle and the pocket and the handle is not prone to be hidden in the pocket when the handle is clamped in the pocket.

Abstract: Provided is a knife, including: blade; a first hilt assembly; a second hilt assembly, the blade being detachably disposed between the first hilt assembly and the second hilt assembly; a connecting portion, disposed on the first hilt assembly; and a handle clip, disposed on the second hilt assembly, wherein a position of the connecting portion is adjustable, such that the connecting portion has a locking position connected to the handle clip and an opening position separated from the handle clip. The knife of the present disclosure solves the problem in the related technology that it is more complicated to disassemble blade of a knife.

Abstract: The present invention provides an elastically-buckled lamp, comprising a mounting base and a lamp body; there are more than three elastic buckles provided on the mounting base; arc-shaped grooves adapted to the elastic buckles are provided at an upper end of the lamp body, and the elastic buckles can be elastically deformed in a radial direction of the arc-shaped grooves and then inserted and clamped into the arc-shaped grooves; and when provided in the arc-shaped grooves, the elastic buckles are capable of sliding along the arc-shaped grooves to enable the lamp body to rotate relatively to the mounting base, so that it is easy to adjust mounting angles. Moreover, it is easy to mount and beautiful in appearance.