Abstract: Disclosed are a derivative of a 2,5-diketopiperazine compound, and a preparation method therefor, a pharmaceutical composition thereof and the use thereof. Specifically, disclosed are a compound as represented by formula (I), a stereoisomer thereof, a tautomer thereof or a pharmaceutically acceptable salt thereof, or a solvate of any one of the aforementioned. The compound is new in terms of structure, and has good anti-tumor activity and water solubility.

Abstract: The present disclosure relates to the field of visual images. A stereoscopic display screen includes: an optical component, configured to provide an optical signal of which the light intensity is lower than the light intensity of video information; a transparent display component, configured to display the video information; and a space imaging frame component, configured to form a hollow enclosed cavity which is visible from the front and has a rear end sealed by the transparent display component. A foreground stage imaging area is formed in an internal region of the space imaging frame component, the space imaging frame component forms, at a position opposite the optical component, a virtual space imaging frame component which takes an axial plane of the transparent display component as a mirror symmetrical plane, and a virtual background stage imaging area is formed in the virtual space imaging frame component.

Abstract: The invention provides a bacterial cellulose-based biosensor, including bacterial cellulose (BC) and a cell presenting a cellulose-binding module CBM2a on the surface. The cell is attached to BC through CBM2a. The cell expresses CBM2a by using pETDuet-tac as a vector. The pETDuet-tac is obtained by replacing two T7 promoters on the vector pETDuet by tac promoters, that is, an upstream first tac promoter and a downstream second tac promoter. The pETDuet-tac includes a gene encoding a fluorescent protein downstream of the first tac promoter and a gene encoding CBM2a presented on the surface downstream of the second tac promoter. By the BC-based biosensor, efficient and specific immobilization of cells on the BC matrix is enabled, the biological activity of cells is maintained, the fluorescence signal output is enhanced, and sufficient pores are provided for the entry and exit of a detected substance, thereby significantly improving the detection sensitivity.

Abstract: Disclosed is a cleaning robot. The cleaning robot includes a body, a traveling assembly, a rolling brush assembly, a dust suction assembly, a mopping assembly, and a universal wheel. The traveling assembly, the rolling brush assembly, the dust suction assembly, the mopping assembly, and the universal wheel are all arranged on the body. The dust suction assembly includes a dust box. The rolling brush assembly is configured for sweeping garbage on a ground. The dust box is configured for receiving garbage swept by the rolling brush assembly. In an advancing direction of the cleaning robot, the dust box is arranged in front of the rolling brush assembly, and the mopping assembly and/or the universal wheel is arranged behind the rolling brush assembly.

Abstract: A wafer metrology system having a continuous dynamic sampling scheme configured to optimize a sampling rate for AVI of process wafers in an IC fabrication flow based on acceptable quality levels. For a stable process, the process wafers may be sampled at a lower rate without negatively affecting quality control.

Abstract: A system and method for cleaning an optical element of an EUV optical system is disclosed. The system and method may include receiving design data of one or more samples. The system and method may include simulating a plurality of irradiance distributions at a plane of an EUV optical sub-system based on the design data and one or more parameters. The system and method may include aggregating the plurality of irradiance distributions to generate an aggregated irradiance distribution. The system and method may include determining a predicted contaminate distribution based on both the aggregated irradiance distribution and a contaminate growth rate. The system and method may include determining a cleaning recipe for the one or more optical elements based on the predicted contaminate distribution.

Abstract: Embodiments of the present disclosure generally relate to apparatus and methods for foam generation, and to apparatus and methods for evaluation of foam systems. In an embodiment, a method of analyzing foam properties includes delivering a foaming composition and a gas to a housing at a pressure of 500 psi to 6,000 psi and a temperature of 35° C. to 150° C., the housing containing an unconsolidated porous media. The method further includes flowing the foaming composition and the gas through the housing, and forming a foam by an interaction of the foaming composition, the gas, and the unconsolidated porous media. The method further includes directing the foam from the housing to a visualization chamber, the visualization chamber in fluid communication with the housing, and measuring a foam characteristic via the visualization chamber. The characteristic may include foam half-life, pressure drop through the unconsolidated media, and/or apparent viscosity of the foam.

Abstract: A method and an apparatus for authority control, a computer device, and a storage medium, and relates to the field of the Internet technologies. The method includes: acquiring a configuration file according to a business scenario when a container is initialized, wherein the configuration file is managed outside the container; validating the configuration file in the container; receiving a user instruction; and identifying a type of the user instruction when the user instruction is an executable instruction. The method further including acquiring script content of a script file when the type of the user instruction indicates that the user instruction is the script file, wherein the script content includes at least one command statement; and performing a validity check on the at least one command statement based on the configuration file.

Abstract: A method and an apparatus for authority control, a computer device, and a storage medium, and relates to the field of the Internet technologies. The method includes: acquiring a configuration file according to a business scenario when a container is initialized, wherein the configuration file is managed outside the container; validating the configuration file in the container; receiving a user instruction; and identifying a type of the user instruction when the user instruction is an executable instruction. The method further including acquiring script content of a script file when the type of the user instruction indicates that the user instruction is the script file, wherein the script content includes at least one command statement; and performing a validity check on the at least one command statement based on the configuration file.

Abstract: The present disclosure relates to the field of visual images. A stereoscopic display screen includes: an optical component, configured to provide an optical signal of which the light intensity is lower than the light intensity of video information; a transparent display component, configured to display the video information; and a space imaging frame component, configured to form a hollow enclosed cavity which is visible from the front and has a rear end sealed by the transparent display component. A foreground stage imaging area is formed in an internal region of the space imaging frame component, the space imaging frame component forms, at a position opposite the optical component, a virtual space imaging frame component which takes an axial plane of the transparent display component as a mirror symmetrical plane, and a virtual background stage imaging area is formed in the virtual space imaging frame component.

Abstract: A semiconductor structure and a method for fabricating the semiconductor structure are provided. The method includes providing a plurality of dummy gates on a substrate, a capping layer on each dummy gate, and a dielectric layer over the substrate, wherein the dielectric layer has a top surface above each dummy gate. The method also includes performing a first ion implantation process on the dielectric layer to form a first stop layer in the dielectric layer. A top surface of the first stop layer is above or coplanar with a top surface of each dummy gate. Further, the method includes performing a first planarization process on the capping layer and the dielectric layer to expose the top surface of each dummy gate. A removal rate of the first stop layer is smaller than a removal rate of the dielectric layer when performing the first planarization process.

Abstract: A semiconductor structure and a method for fabricating the semiconductor structure are provided. The method includes forming a base substrate, including a substrate, a gate structure on the substrate, source and drain doped regions in the substrate on both sides of the gate structure, and a dielectric layer on the substrate and on top of the gate structure. The method also includes forming a contact hole, penetrating through the dielectric layer, wherein a bottom of the contact hole extends into each of the source and drain doped regions. In addition, the method includes forming a doped layer, in each of the source and drain doped regions by a doping process via the bottom and a portion of sidewalls of the contact hole. Further, the method includes forming a conductive plug in the contact hole.

Abstract: A semiconductor structure and a method for fabricating the semiconductor structure are provided. The method includes providing a plurality of dummy gates on a substrate, a capping layer on each dummy gate, and a dielectric layer over the substrate, wherein the dielectric layer has a top surface above each dummy gate. The method also includes performing a first ion implantation process on the dielectric layer to form a first stop layer in the dielectric layer. A top surface of the first stop layer is above or coplanar with a top surface of each dummy gate. Further, the method includes performing a first planarization process on the capping layer and the dielectric layer to expose the top surface of each dummy gate. A removal rate of the first stop layer is smaller than a removal rate of the dielectric layer when performing the first planarization process.

Abstract: A flight control system is provided. The system includes a primary circuit board, a secondary circuit board electrically connected to the primary circuit board, a system on chip (SOC) integrated chip, a power management chip configured to supply power to the SOC integrated chip, an electronic speed control (ESC) driving circuit module configured to control flight speed in response to an instruction from the SOC integrated chip. In the system, the SOC integrated chip and the power management chip are arranged on the primary circuit board, and the ESC driving circuit module is arranged on the secondary circuit board.