Abstract: A lens with adjustable light angle includes a lens outer portion, a spiral lens portion, and a lens middle cover portion. The spiral lens portion includes a spiral lens strip matched with a spiral lamp bead strip on the light source board. The spiral lens strip includes a light entering surface having a receiving groove corresponding to the spiral lamp bead strip and a light exiting surface. The light exiting surface is divided into a first light exiting surface and a second light exiting surface respectively extending from a middle of an arc-shaped surface to two sides of the arc-shaped surface. The lens middle cover portion is rotated to enable the receiving groove to move relative to the plurality of lamp beads, which allows light to be alternatively emitted from at least one of the first light exiting surface or the second light exiting surface.

Abstract: A lens with adjustable light angle includes a lens outer portion, a spiral lens portion, and a lens middle cover portion. The spiral lens portion includes a spiral lens strip matched with a spiral lamp bead strip on the light source board. The spiral lens strip includes a light entering surface having a receiving groove corresponding to the spiral lamp bead strip and a light exiting surface. The light exiting surface is divided into a first light exiting surface and a second light exiting surface respectively extending from a middle of an arc-shaped surface to two sides of the arc-shaped surface. The lens middle cover portion is rotated to enable the receiving groove to move relative to the plurality of lamp beads, which allows light to be alternatively emitted from at least one of the first light exiting surface or the second light exiting surface.

Abstract: The present disclosure belongs to the field of molecular biology, particularly to the technical field of gene analysis and detection, and specifically relates to a method for preparing a DNA library and a method for detecting a retroviral integration site. Specifically, the method for preparing the DNA library comprises the following steps: 1) fragmenting a genomic DNA from a retrovirus-infected cell to obtain DNA fragments; 2) subjecting the DNA fragments to end-repair, A-tailing, and ligation with an adapter to obtain a ligation product, wherein the adapter is an asymmetric double-strand adapter comprising a long-strand sequence and a short-strand sequence, wherein the long-strand sequence sequentially comprises, from a 5? end to a 3? end, a fixed sequence, a random UMI sequence, and an amplification primer binding sequence, and the short-strand sequence comprises a sequence complementary to the fixed sequence; and other steps.

Abstract: A virus lysis and nucleic acid preservation solution is disclosed, including the following components: isopropanol or ethyl alcohol, guanidinium chloride, tri (hydroxymethyl) aminomethane hydrochloride, and ethylenediaminetetraacetic acid. Furthermore, a kit including the virus lysis and nucleic acid preservation solution, a method for preserving viral nucleic acid, and a method for extracting a viral nucleic acid are also provided. The virus lysis and nucleic acid preservation solution of the present invention has the functions of lysing virus and preserving nucleic acid in the lysed virus samples, and it is compatible with lysis buffers, wash buffers, elution buffers, etc. in all kinds of viral nucleic acid extraction kit commonly available in the market.

Abstract: A robot-assisted hand-eye coordination training system based on a smooth pursuit eye movement and a guidance force field includes a virtual interactive scene module, a smooth pursuit eye movement detection module, a robot-assisted interception module and an impact force rendering module. The virtual interactive scene module can generate a virtual interactive scene having a virtual moving object and a virtual handle agent. The smooth pursuit eye movement detection module collects an eye movement signal of a user when the user performs pursuit eye movements on the virtual moving object to detect a smooth pursuit eye movement event. The robot-assisted interception module estimates a movement direction of the virtual moving object, generates an interception and guidance force field, and therefore generates assisting force to assist the user in interception. The impact force rendering module generates impact force according to an impact force computation model after collision is detected.

Abstract: An adaptive control method and system for an upper limb rehabilitation robot based on a game theory and surface Electromyography (sEMG) is disclosed. A movement trajectory that a robot is controlled to run within a training time is designed during subject operation. An sEMG-based Back Propagation Neural Network (BPNN) muscle force estimation model establishes a nonlinear dynamic relationship between an sEMG signal and end force by constructing a three-layer neural network. A human-computer interaction system is analyzed by the game theory principle, and a role of the robot is deduced. The control rate between the robot and a subject is updated by Nash equilibrium, and adaptive weight factors of the robot and the subject are determined. The robot adaptively adjusts the training mode thereof according to a movement intention of the subject during operation and a weight coefficient obtained by the game theory principle.

Abstract: A robot-assisted hand-eye coordination training system based on a smooth pursuit eye movement and a guidance force field includes a virtual interactive scene module, a smooth pursuit eye movement detection module, a robot-assisted interception module and an impact force rendering module. The virtual interactive scene module can generate a virtual interactive scene having a virtual moving object and a virtual handle agent. The smooth pursuit eye movement detection module collects an eye movement signal of a user when the user performs pursuit eye movements on the virtual moving object to detect a smooth pursuit eye movement event. The robot-assisted interception module estimates a movement direction of the virtual moving object, generates an interception and guidance force field, and therefore generates assisting force to assist the user in interception. The impact force rendering module generates impact force according to an impact force computation model after collision is detected.

Abstract: An adaptive control method and system for an upper limb rehabilitation robot based on a game theory and surface Electromyography (sEMG) is disclosed. A movement trajectory that a robot is controlled to run within a training time is designed during subject operation. An sEMG-based Back Propagation Neural Network (BPNN) muscle force estimation model establishes a nonlinear dynamic relationship between an sEMG signal and end force by constructing a three-layer neural network. A human-computer interaction system is analyzed by the game theory principle, and a role of the robot is deduced. The control rate between the robot and a subject is updated by Nash equilibrium, and adaptive weight factors of the robot and the subject are determined. The robot adaptively adjusts the training mode thereof according to a movement intention of the subject during operation and a weight coefficient obtained by the game theory principle.

Abstract: The present invention relates to the field of manufacture of polymer materials, and more particularly to an ultra-high molecular weight polyethylene (UHMWPE) composition and a cut resistant and creep resistant fiber prepared therefrom. The ultra-high molecular weight polyethylene composition comprises the following components: modified graphene, modified silicon carbide whisker, and ultra-high molecular weight polyethylene. The ultra-high molecular weight polyethylene composition provided by the present invention has superior cut resistance, high strength and high modulus. By regulating the morphology of silicon carbide, the type of a coupling agent, the mixing ratio and so on, not only cut resistance, high strength and high modulus can be provided, but also creep resistance can be improved.

Abstract: A wrist rehabilitation training system based on muscle coordination and variable stiffness impedance control includes the following modules: an electromyographic signal collection and preprocessing module, a muscle co-decomposition and mapping model obtaining module, a man-machine interactive control module, and a virtual reality serious game module; collects a surface electromyographic signal of a forearm of a user, obtains time-domain coordination through non-negative matrix factorization, establishes a position and stiffness estimation model, and controls motion of a target in a serious game through variable stiffness impedance control, so as to complete a training task.

Abstract: A sequencing method, system and kit of low molecular weight heparin (LMWH) oligosaccharides are provided.

Abstract: A virus preservation solution is disclosed, including the following components: isopropanol or ethyl alcohol, guanidine hydrochloride, tri (hydroxymethyl) aminomethane hydrochloride, and ethylenediaminetetraacetic acid. Furthermore, a kit including the virus preservation solution, a method for preserving a virus, and a method for extracting a viral nucleic acid are also provided. The virus preservation solution of the present invention has the functions of preserving and lysing virus samples, and it is compatible with lysis buffers, wash buffers, elution buffers, etc. in all kinds of viral nucleic acid extraction kit commonly available in the market.

Abstract: The present invention relates to the field of manufacture of polymer materials, and more particularly to an ultra-high molecular weight polyethylene (UHMWPE) composition and a cut resistant and creep resistant fiber prepared therefrom. The ultra-high molecular weight polyethylene composition comprises the following components: modified graphene, modified silicon carbide whisker, and ultra-high molecular weight polyethylene. The ultra-high molecular weight polyethylene composition provided by the present invention has superior cut resistance, high strength and high modulus. By regulating the morphology of silicon carbide, the type of a coupling agent, the mixing ratio and so on, not only cut resistance, high strength and high modulus can be provided, but also creep resistance can be improved.

Abstract: The present invention discloses a highly cut-resistant ultrahigh molecular weight polyethylene fiber, made of a ultrahigh molecular weight polyethylene and an inorganic ultrafine micropowder having a nanocrystalline structural morphology, wherein the inorganic ultrafine micropowder is one of an oxide, carbide, and nitride of aluminium, titanium, silicon, boron, and zirconium, or a combination thereof, and has an average diameter of 0.1-300 ?m and a content of 0.1-14% of the total weight of the fiber.

Abstract: The present invention relates to a modular light guide plate comprising a light guide plate including a side wall used for entering the light to couple the light emitted by the LED into the interior of the light guide plate, an upper surface and a lower surface, and a reflective sheet arranged below the lower surface of the light guide plate and having a high reflectivity to the light emitted by the LED, wherein the lower surface of the light guide plate is provided with a raised dot, which is bonded to the lower surface of the light guide plate at the upper end thereof and to the upper surface of the reflective sheet at the lower end thereof, and the material of the dot body is a transparent optical material, and optical particles are uniformly dispersed in the dot, thereby having the advantages of high light extraction efficiency.

Abstract: The present invention relates to a modular light guide plate comprising a light guide plate including a side wall used for entering the light to couple the light emitted by the LED into the interior of the light guide plate, an upper surface and a lower surface, and a reflective sheet arranged below the lower surface of the light guide plate and having a high reflectivity to the light emitted by the LED, wherein the lower surface of the light guide plate is provided with a raised dot, which is bonded to the lower surface of the light guide plate at the upper end thereof and to the upper surface of the reflective sheet at the lower end thereof, and the material of the dot body is a transparent optical material, and optical particles are uniformly dispersed in the dot, thereby having the advantages of high light extraction efficiency.

Abstract: The present invention discloses a highly cut-resistant ultrahigh molecular weight polyethylene fiber, made of a ultrahigh molecular weight polyethylene and an inorganic ultrafine micropowder having a nanocrystalline structural morphology, wherein the inorganic ultrafine micropowder is one of an oxide, carbide, and nitride of aluminium, titanium, silicon, boron, and zirconium, or a combination thereof, and has an average diameter of 0.1-300 ?m and a content of 0.1-14% of the total weight of the fiber.