Abstract: A method for preparing (S)-nicotine by reduction includes conducting a reduction process on an alkene compound as shown in Formula I and/or an iminium cation compound as shown in Formula II, thereby producing (S)-nicotine. The method is simple, safe, reliable, and yields both high purity and high quantities of (S)-nicotine production.

Abstract: A packet forwarding method and apparatus, and a communication network, related to the field of communication technologies. In the solutions provided, a controller may obtain a correspondence between an application-aware identifier of a service flow and a network service required for transmitting the service flow, and deliver the correspondence to a network device. Further, when identifying the service flow as a service flow indicated by the application-aware identifier, the network device may directly forward a packet of the service flow by using the corresponding network service. The controller may establish and deliver the correspondence between the application-aware identifier and the network service, so that the network device can directly forward the service packet of the service flow based on the correspondence. Therefore, flexibility of forwarding the service packet is effectively improved.

Abstract: A method, base station and user equipment are provided for wireless communication. The method can include steps: transmitting data on a first frequency band; transmitting, on a second frequency band, a detection signal for detecting a channel condition of the second frequency band; generating channel condition information about the second frequency band based on the received detection signal; feeding back the channel condition information via the first frequency band; and selecting a current data transmission frequency band based at least in part on the feedback channel condition information about the second frequency band and/or traffic requirement information; wherein the current data transmission frequency band is any one of the first frequency band, the second frequency band or a cooperative transmission of the first frequency band with the second frequency band.

Abstract: A target detection method includes inputting a to-be-detected image into a backbone included in a target detection model to determine that an output of the backbone is a feature corresponding to the to-be-detected image and inputting the feature corresponding to the to-be-detected image into a prediction head included in the target detection model to determine that an output of the prediction head is target information included in the to-be-detected image. The target information included in the to-be-detected image includes at least one of position information, size information, orientation information, depth information, or blocking information of a target in the to-be-detected image. The target detection model is trained and obtained based on a sample image including a target sub-area and a non-target sub-area.

Abstract: Provided are a device and a method for live detecting a partial discharge of an overhead line in a distribution network and equipment along the line, including: acquiring a second synchronous pulse signal and a first partial discharge signal via a master detection unit; acquiring a first synchronous pulse signal and a second partial discharge signal via a slave detection unit; analyzing the second synchronous pulse signal and the first synchronous pulse signal via a main control computer to obtain time data; and calculating a propagation time based on the time data, synchronously processing the time data based on the propagation time to obtain reference zeros, and calculating a partial discharge location according to the first partial discharge signal and the second partial discharge signal based on the reference zeros.

Abstract: A resin composition, comprising: a modified maleimide resin (A), an active ester resin (B), and an epoxy resin (C); the modified maleimide resin (A) is obtained by means of reacting a maleimide compound (M) having at least two maleimide groups/molecules with an amine compound (N1) having at least one primary amine group/molecule and an amine compound (N2) having at least two primary amine groups/molecules, and the molecular weight distribution is: molecules having a molecular weight between 1000 and 4500 account for 25-60% the total number of molecules.

Abstract: Communication method and base stations are provided. One example includes determining, by a base station, that co-channel interference exists. For N consecutive symbols before a guard period (GP) in a special subframe in a radio frame, the base station sends a signal by using M1 middle resource blocks (RBs) of the N symbols, and reserves use of an RB other than the M1 RBs in the N symbols, where both N and M1 are positive integers.

Abstract: Hydraulic two-side rolling-cut shears, including: a front transport roller device, a rear transport roller device, a shear body, and a roller carrier. The front transport roller device includes a laser scriber, a magnetic alignment device, and a pinch roller device. The rear transport roller device includes a vertical guide roller. The laser scriber is disposed on the front end of the front transport roller device. The magnetic alignment device is disposed in the middle part of the front transport roller device. The pinch roller device is disposed on the rear end of the front transport roller device in front of the shear body. The roller carrier is disposed longitudinally in the middle of the shear body. The vertical guide roller is disposed on the rear transport roller device and behind the shear body.

Abstract: The present disclosure provides a method for controlling a solar energy system. The method includes: receiving component control information sent by an external control system, and executing a control operation corresponding to the component control information on a solar energy component connected to a junction box according to the component control information. A device for controlling a solar energy system, a central controller and a solar energy system are also provided.

Abstract: A solar module junction box, a solar system and a control method for solar module are provided, the solar module junction box comprising: a state detection module, a controller and a power module; the state detection module is connected to the controller, the controller being connected to the power module; the state detection module is configured to detect a state of a solar module and transmit a state detection data to the controller; the controller is configured to acquire the state detection data, generate a switch-off control signal when the state detection data is abnormal, and transmit the switch-off control signal to the power module; the power module is configured to adjust an output voltage to be within a preset low voltage range after receiving the switch-off control signal.

Abstract: The disclosure provides a device, system and method for controlling power on or power off of a solar module. The device for controlling power on or power off of a solar module comprises: a microcontroller; a collecting device, which is electrically connected to the microcontroller and configured to collect state information and transmit the collected state information to the microcontroller; and a switch component, which is electrically connected to the microcontroller and the solar module, and configured to control power on or power off of the solar module according to the state information received by the microcontroller.

Abstract: The provided method includes: classifying damage assessing images of a same vehicle portion into one same image set; obtaining keypoint features of each image set, diving every two damage assessing images in each image set into one image group, matching multiple relevant keypoints from the damage assessing images in each image group; calculating a feature point transform matrix of each image, and converting one of the two damage assessing images in each image group to a to-be-verified image which has the same shooting angle as the other damage assessing image in the image group; matching feature parameters of the to-be-verified image with those of the other damage assessing image in the same image group; and generating reminder information, when there are unmatched parameters, to remind the user of frauds of the damage assessing images received from the terminal.

Abstract: Communication method and base stations are provided. One example includes determining, by a base station, that co-channel interference exists. For N consecutive symbols before a guard period (GP) in a special subframe in a radio frame, the base station sends a signal by using M1 middle resource blocks (RBs) of the N symbols, and reserves use of an RB other than the M1 RBs in the N symbols, where both N and M1 are positive integers.

Abstract: The provided method includes: classifying damage assessing images of a same vehicle portion into one same image set; obtaining keypoint features of each image set, diving every two damage assessing images in each image set into one image group, matching multiple relevant keypoints from the damage assessing images in each image group; calculating a feature point transform matrix of each image, and converting one of the two damage assessing images in each image group to a to-be-verified image which has the same shooting angle as the other damage assessing image in the image group; matching feature parameters of the to-be-verified image with those of the other damage assessing image in the same image group; and generating reminder information, when there are unmatched parameters, to remind the user of frauds of the damage assessing images received from the terminal.

Abstract: An apparatus including a sound transducer; a casing member, where the sound transducer is mounted to the casing member, and where the casing member is configured to at least partially form an enclosure for the sound transducer; and electrical conductors integrally formed with the casing member. The electrical conductors are electrically connected to the sound transducer. The electrical conductors are configured to provide electrical connectivity for the sound transducer, where at least one of the electrical conductors is configured to couple to an antenna pattern to form part of an antenna arrangement.

Abstract: Hydraulic two-side rolling-cut shears, including: a front transport roller device, a rear transport roller device, a shear body, and a roller carrier. The front transport roller device includes a laser scriber, a magnetic alignment device, and a pinch roller device. The rear transport roller device includes a vertical guide roller. The laser scriber is disposed on the front end of the front transport roller device. The magnetic alignment device is disposed in the middle part of the front transport roller device. The pinch roller device is disposed on the rear end of the front transport roller device in front of the shear body. The roller carrier is disposed longitudinally in the middle of the shear body. The vertical guide roller is disposed on the rear transport roller device and behind the shear body.

Abstract: An apparatus including a sound transducer; a casing member, where the sound transducer is mounted to the casing member, and where the casing member is configured to at least partially form an enclosure for the sound transducer; and electrical conductors integrally formed with the casing member. The electrical conductors are electrically connected to the sound transducer. The electrical conductors are configured to provide electrical connectivity for the sound transducer, where at least one of the electrical conductors is configured to couple to an antenna pattern to form part of an antenna arrangement.

Abstract: The present invention relates to an on-line analyzer for VOCs in gas and method of using the same, comprising: a sampling device, a gas supply device and a refrigerating device connected to the sampling device and the gas supply device respectively; the on-line analyzer for VOCs in gas with two cryo-focuses in empty tubes and two detectors also comprises a gas flow control device connected to the sampling device and the gas-supply device respectively, an analyzing device connected to the gas flow control device, and a data acquisition and processing device connected to the analyzing device. Therefore, the present invention has a following advantage: the present invention runs automatically and continuously over a long period since it uses electronic refrigeration technique to achieve cryo-refrigeration, instead of using liquid nitrogen refrigeration technique which needs frequent addition of liquid nitrogen and limits application conditions.

Abstract: The present invention relates to an on-line analyzer for VOCs in gas and method of using the same, comprising: a sampling device (1), an gas-supply device (2) and a refrigerating device (3) connected to the sampling device (1) and the gas-supply device (2) respectively; the on-line analyzer for VOCs in gas with two cryo-focuses in empty tubes and two detectors also comprises a gas flow control device (4) connected to the sampling device (1) and the gas-supply device (2) respectively, an analyzing device (5) connected to the gas flow control device (4), and a data acquisition and processing device connected to the analyzing device (5). Therefore, the present invention has a following advantage: the present invention runs automatically and continuously over a long period since it uses electronic refrigeration technique to achieve cryo-refrigeration, instead of using liquid nitrogen refrigeration technique which needs frequent addition of liquid nitrogen and limits application conditions.

Abstract: A long optical path gas monitor is open-typed or close-typed. The monitor includes an optical generation part and a signal processing part. Said optical generation part comprises an emitter, a receiver and multi-group concave mirrors or prisms used to form enough optical path between the emitter and the receiver. Said signal processing part includes an optical fiber (21), a spectrometer (22), a scanner (23), an optoelectronic detector (24) and a computer (25), which are connected sequentially. The input end of the optical fiber (21) is connected to the receiver.