Abstract: The present disclosure provides an adaptive modulation method for a naive Bayes classifier-based energy harvesting relay system. First, a sending end determines its modulation mode based on a status of a data buffer of a relay, so that sent data does not exceed a storage capability of the relay. Then, based on data sent by the sending end, and channel status information and energy harvesting status information within a period of time, the relay determines an optimal modulation mode used by the relay within the period of time. After that, the modulation mode, the channel status information, and the energy harvesting status information are used as training data to obtain a classification model based on a naive Bayes classifier algorithm. In this way, the relay can adaptively select a modulation mode when only knowing of channel information and energy information in a current timeslot.

Abstract: The present invention provides an organic nano-grid, a nano-polymer thereof and a preparation method therefor. The organic nano-grid has a general formula (I), and the nano-polymer has a general formula (II), wherein R1 is an alkyl chain, R2 is halogen or an electroactive group, and X may comprise a heteroatom such as N, O and S, and n is a natural number from 1 to 10. A nano-connection strategy is applied to the construction of a one-dimensional nano-polymer. The polymer starts from a monomer A2B2 to form a corresponding nano-polymer by a Friedel-Crafts polymerization cyclization reaction.

Abstract: A narrow pulse generation circuit used in a sequential equivalent sampling system. The circuit comprises a crystal oscillator, an edge sharpening circuit, an avalanche transistor single-tube amplifying circuit and a shaping network connected in sequence, wherein the edge sharpening circuit is used for carrying out edge sharpening on a square wave signal generated by the crystal oscillator; the avalanche transistor single-tube amplifying circuit is used for carrying out avalanche amplification on the sharpened square wave signal to generate a Gaussian pulse signal to adjust the amplitude of a pulse; and the RC shaping network is used for shaping the Gaussian pulse signal to adjust the pulse width at the bottom of the pulse to form a narrow pulse signal. The narrow pulse circuit has a simple structure and narrow pulse width at the bottom and facilitates increasing a signal-to-noise ratio of a whole sequential sampling system.

Abstract: A wide-beam planar backfire and bidirectional circularly-polarized antenna. An entire planar sectorial magnetic dipole is of a semi-closed structure, the planar sectorial magnetic dipole comprises two identical sectorial patches and a vertical short-circuit wall, and the vertical short-circuit wall is connected with straight sides of the two sectorial patches along a radial direction of the planar sectorial magnetic dipole; two sets of concentric annular electric dipoles are respectively used as a top concentric annular radiating element and a bottom concentric annular radiating element, as well as a top concentric annular reflector and a bottom anti-concentric annular reflector; and the top concentric annular radiating element is connected with an upper surface of the planar sectorial magnetic dipole through a top connecting branch, and the bottom concentric annular radiating element is connected with a lower surface of the planar sectorial magnetic dipole through a bottom connecting branch.

Abstract: Disclosed is an intelligent frequency-shift anti-interference autonomous communication method based on electromagnetic environment learning, applied to an intelligent frequency-shift anti-interference autonomous communication system based on electromagnetic environment learning. The method comprises a communication link establishing process and an intelligent frequency-shift anti-interference process in the communication process. In the communication link establishing process, a communication initiator initiates communication to a communication responder, and the communication initiator and the communication responder perform frequency point matching, and finally negotiate to establish a communication connection.

Abstract: The present disclosure provides an adaptive modulation method for a naive Bayes classifier-based energy harvesting relay system. First, a sending end determines its modulation mode based on a status of a data buffer of a relay, so that sent data does not exceed a storage capability of the relay. Then, based on data sent by the sending end, and channel status information and energy harvesting status information within a period of time, the relay determines an optimal modulation mode used by the relay within the period of time. After that, the modulation mode, the channel status information, and the energy harvesting status information are used as training data to obtain a classification model based on a naive Bayes classifier algorithm. In this way, the relay can adaptively select a modulation mode when only knowing of channel information and energy information in a current timeslot.

Abstract: An ultra-wideband ground penetrating radar control system, comprising a synchronous clock generating circuit, a GPS positioning module, a measuring wheel encoder module, a digitally controlled delay circuit for equivalent sampling, an analog-to-digital conversion (ADC) circuit, and a main controller. The synchronous clock generating circuit, the GPS positioning module, the measuring wheel encoder module, the digitally controlled delay circuit and the ADC circuit are all connected to the main controller. The synchronous clock generating circuit is further connected to an external ultra-wideband radar transmitter. The digitally controlled delay circuit is further connected to an external sampling pulse generation circuit for equivalent sampling. The ADC circuit is further connected to an external sampling gate for equivalent sampling. The main controller is further connected to an external server via Ethernet. The volume of an ultra-wideband ground penetrating radar control system is reduced.

Abstract: A narrow pulse generation circuit used in a sequential equivalent sampling system. The circuit comprises a crystal oscillator, an edge sharpening circuit, an avalanche transistor single-tube amplifying circuit and a shaping network connected in sequence, wherein the edge sharpening circuit is used for carrying out edge sharpening on a square wave signal generated by the crystal oscillator; the avalanche transistor single-tube amplifying circuit is used for carrying out avalanche amplification on the sharpened square wave signal to generate a Gaussian pulse signal to adjust the amplitude of a pulse; and the RC shaping network is used for shaping the Gaussian pulse signal to adjust the pulse width at the bottom of the pulse to form a narrow pulse signal. The narrow pulse circuit has a simple structure and narrow pulse width at the bottom and facilitates increasing a signal-to-noise ratio of a whole sequential sampling system.

Abstract: A Quantum Digital Signature (QDS)-based mail system and a transceiving method are provided. The system is a three-layer structure formed by a physical layer, a key layer, and an application layer. The physical layer is a key generation terminal and is used to generate a key string for signature in real time; the key layer is used to store the key string generated by the physical layer and provide a required key to the upper layer, namely, the application layer when required; and the application layer is a transceiving software part in the mail system, and is used to extract keys generated by the physical layer from the key layer so as to encrypt information to be sent. The mail transceiving method comprises: a quantum key distribution (QKD) phase, a mail signature phase, and a signature verification phase.

Abstract: A vertical blue LED includes: a conductive substrate, the conductive substrate including a first surface and a second surface opposite to the first surface a nitride epitaxial layer; a metal reflective layer, positioned on the first surface; a nitride epitaxial layer, positioned on a surface of the metal reflective layer and including a P-type GaN layer, a quantum well layer, a preparation layer, and an N-type GaN layer that are sequentially stacked along a direction perpendicular to the conductive substrate, wherein a thickness of the nitride epitaxial layer is less than a wavelength of blue light; an N-type electrode, positioned on a surface of the N-type GaN layer; and a P-type electrode, positioned on the second surface.

Abstract: A homogeneous integrated infrared photonic chip and a method for manufacturing the same are provided. The homogeneous integrated infrared photonic chip includes a substrate layer, and a device structure and a waveguide structure that are both positioned on a surface of the substrate layer; wherein the device structure includes a lower contact layer, a quantum well layer, and an upper contact layer that are sequentially stacked along a direction perpendicular to the substrate layer, and the substrate layer, the lower contact layer, the quantum well layer, and the upper contact layer are made of a III-V material; and wherein the waveguide structure includes a waveguide layer made of the III-V material, the waveguide layer and the lower contact layer being arranged in the same layer.

Abstract: Disclosed in the invention is an emergency message transmission method based on D2D communication in IoV. Firstly, priority indexes are established for a set of vehicles within a safety range of a certain vehicle, and D2D connection pairs are established in ascending order of the priority indexes to transmit messages; and then, distance prediction is performed on the set of vehicles outside the safety range, priority indexes are established according to predicted distances, and D2D connection pairs are established in ascending order of the priority indexes to transmit messages. If same priority indexes appear, vehicles on the same lane are selected first. The invention implements timely transmission of safety warning information on basis of D2D communication, and performs safety warning, thereby solving the technical problem of inability to transmit safety information in time, and improving transmission performance of traffic messages. Therefore, the invention has high reliability and real-time properties.

Abstract: Disclosed are an organic nano-grid, a nano-polymer thereof and a preparation method therefor. The organic nano-grid has a general formula (I), and the nano-polymer has a general formula (II), wherein R1 is an alkyl chain, R2 is halogen or an electroactive group, and X may comprise a heteroatom such as N, O and S, and n is a natural number from 1 to 10. A nano-connection strategy is applied to the construction of a one-dimensional nano-polymer. The polymer starts from a monomer A2B2 to form a corresponding nano-polymer by a Friedel-Crafts polymerization cyclization reaction.

Abstract: An integrated molding device suitable for the bending and hemming of a flat sheet, comprising a stand, a worktable, a slider, and a turning beam. The stand comprises a frame structure composed of an upper cross beam, a lower cross beam, and columns on both sides, two ends of the slider are connected to the columns on both sides by means of a pair of sliding pairs A respectively, and the clutching of a bending die is achieved by means of the linear movement of the sliding pairs A; the worktable is fixed on the lower cross beam, and the clutching of a pressing die is achieved by means of the linear movement of the sliding pairs A; two ends of a swing frame are connected to the columns on both sides by means of one connecting block respectively, the connecting block and the columns are connected therebetween by means of a pair of rotating pairs B, and the connecting block and the swing frame are connected therebetween by means of a pair of sliding pairs C.

Abstract: Disclosed is an intelligent frequency-shift anti-interference autonomous communication method based on electromagnetic environment learning, applied to an intelligent frequency-shift anti-interference autonomous communication system based on electromagnetic environment learning. The method comprises a communication link establishing process and an intelligent frequency-shift anti-interference process in the communication process. In the communication link establishing process, a communication initiator initiates communication to a communication responder, and the communication initiator and the communication responder perform frequency point matching, and finally negotiate to establish a communication connection.

Abstract: The invention relates to an organic polyspiralgrid nanopolymer material and a preparation method thereof, and belongs to the field of nanotechnology and organic electronics. The structure of the organic polyspiralgrid nanopolymer material is composed of grids containing a spiro ring that serves as a repeat unit to form a special nano polymer, and the structure shares the spiro ring structure. A synthetic method thereof relates to a synthon containing the spiro ring, and by means of a Friedel-Crafts reaction, an organic spirogrid and a nano polymer thereof are built. By means of reasonable molecular design and the Friedel-Crafts reaction with the advantages of being mild in reaction condition, high in yield, high in selectivity, simple in posttreatment, green, free of toxicity and the like, the problems that a traditional polymer molecule is complex in synthesis step, toxic in posttreatment, large in pollution and the like are solved.

Abstract: An integrated molding device suitable for the bending and hemming of a flat sheet, comprising a stand, a worktable, a slider, and a turning beam. The stand comprises a frame structure composed of an upper cross beam, a lower cross beam, and columns on both sides, two ends of the slider are connected to the columns on both sides by means of a pair of sliding pairs A respectively, and the clutching of a bending die is achieved by means of the linear movement of the sliding pairs A; the worktable is fixed on the lower cross beam, and the clutching of a pressing die is achieved by means of the linear movement of the sliding pairs A; two ends of a swing frame are connected to the columns on both sides by means of one connecting block respectively, the connecting block and the columns are connected therebetween by means of a pair of rotating pairs B, and the connecting block and the swing frame are connected therebetween by means of a pair of sliding pairs C.

Abstract: Provided is an auxiliary bending robot capable of processing two workpieces simultaneously, including a linear base slide rail, a slider, a movable major arm, a movable minor arm, a front arm, a swing link, and an additional seventh axis. The slider is slidably connected to the linear base slide rail, and a first axis is formed between the slider and the linear base slide rail. A top portion of the slider is directly or indirectly hinged to a rear end of the movable major arm through a second axis, a front end of the movable major arm is hinged to a rear end of the movable minor arm through a third axis, a front end of the movable minor arm is hinged to a rear end of the front arm through a fourth axis, and a front end of the front arm is rotatably connected to a middle portion of the swing link through a fifth axis.

Abstract: Provided is an auxiliary bending robot capable of processing two workpieces simultaneously, including a linear base slide rail, a slider, a movable major arm, a movable minor arm, a front arm, a swing link, and an additional seventh axis. The slider is slidably connected to the linear base slide rail, and a first axis is formed between the slider and the linear base slide rail. A top portion of the slider is directly or indirectly hinged to a rear end of the movable major arm through a second axis, a front end of the movable major arm is hinged to a rear end of the movable minor arm through a third axis, a front end of the movable minor arm is hinged to a rear end of the front arm through a fourth axis, and a front end of the front arm is rotatably connected to a middle portion of the swing link through a fifth axis.

Abstract: An integrated device and a fabrication method thereof are provided. In the device, by using various anisotropic silicon etching techniques, the silicon substrate layer and the expitaxial buffer layer under the device structure are removed, an ultra-thin device monolithically integrated with a suspended LED, an optical waveguide and a photodetector is obtained by further using the nitride back thinning etching technique. In the device, the light source, the optical waveguide and the photodetector are integrated on the same chip. The light emitted by the LED is laterally coupled to the optical waveguide, transmitted over the optical waveguide, and detected by the photodetector at the other end of the optical waveguide, thereby achieving a planar photon monolithically integrated device which is applied in the fields of optical transmission and optical sensing.