Abstract: A device for assembly and disassembly is provided. The device includes a support assembly, a bearing assembly, and a latching assembly. The support assembly includes a first support member and a locking assembly, the locking assembly includes a locking driver and a locking connection structure, and the locking connection structure is configured to support a negative pressure assembly. The latching assembly includes a first connection structure, a second connection structure, and a movable connection structure, wherein the first connection structure is latched with the second connection structure through the movable connection structure. The locking connection structure is separated from the negative pressure assembly while the movable connection structure is latched with the second connection structure, or the locking connection structure is connected to the negative pressure assembly while the movable connection structure is unlatched from the second connection structure.

Abstract: A fetal Doppler (10) and a detection method, which relate to the technical field of medical devices. The fetal Doppler (10) comprises a housing (1, a fetal detection unit (20) and a maternal parameter detection unit (30), wherein the fetal detection unit (20) and the maternal parameter detection unit (30) are respectively used for collecting fetal physiological data and maternal physiological data; a controller (7) is arranged in an internal cavity of the housing (1); and the controller (7) is used for analyzing the collected fetal physiological data and maternal physiological data, so as to obtain a fetal heart rate and a maternal parameter. The same fetal Doppler (10) is used, such that the instrument cost is reduced; and maternal and fetal parameters can be acquired at the same time by directly using the same fetal Doppler (10), such that an instrument structure is simplified, and the detection efficiency of the maternal and fetal parameters is improved.

Abstract: A continuous wet ball-milling separation device has a cylinder, which has a feeding section, a shearing section, and a crushing section in sequence from top to bottom. The feeding section is located at the upper portion of the device, and is provided with a liquid inlet, a material inlet, and a material distributor. The shearing section is located in the middle of the device, and is internally provided with shearing blades. The crushing section is located at the lower portion of the device, and is internally provided with stirring rods and crushing balls, and a grading discharge module is provided at the bottom of the crushing section. A grading discharge module is used in the device and a continuous wet ball-milling separation method applying the device. The device implements continuous operations of material crushing and grading by means of the material distributor, wet shearing, wet crushing, and wet grading.

Abstract: A neodymium-iron-boron magnet is provided. The neodymium-iron-boron magnet is subject to diffusion and permeation of a heavy rare earth element, the neodymium-iron-boron magnet includes a heavy-rare-earth diffusion region at a surface layer and a core non-diffusion region, and the neodymium-iron-boron magnet has the heavy-rare-earth diffusion region at regions, which have normal directions consistent with three axes of a three-dimensional Cartesian coordinate system, of the surface layer. The present application extends the principle of diffusion from microscopic grains to macroscopic magnets. Diffusion layers of different depths may be obtained by adjusting temperature and time of heat treatment. Through the magnetic hardening of the surface layer of the magnet, the coercive force of the magnet is increased, and the magnet remanence (Br) and the maximum magnetic energy level (BHmax) are very slightly reduced. The producing process is simple, and highly controllable.

Abstract: An integrated circuit is described. This integrated circuit may include a wireless-charger transmitter, which includes a driver circuit electrically coupled to multiple branches associated with multiple transmission coils. A given branch may include or may be electrically coupled to: a capacitor, a multiplexor (MUX) switch that includes a single field-effect transistor (FET) or a single integrated-gate bipolar transistor (IGBT), and a given transmission coil. Moreover, the wireless-charger transmitter may include a control circuit that provides control signals to gates of FETs or the IGBTs in the branches that selectively activate at least the MUX switch in the given branch and selectively deactivate remaining MUX switches in a remainder of the branches. Furthermore, the driver circuit may perform wireless charging by driving the given transmission coil in the activated given branch using an electrical signal having a fundamental frequency component.

Abstract: A perforating device includes a release sub, a rotating segment, a first centralizer, a braking segment, a casing collar locator, a traction mechanism, a second centralizer, a flex joint, a power supply segment, a shock absorber, a perforator, and a tail segment, which are in threaded connection sequentially to each other. The first joint assembly includes a first joint, a guide key, a connecting sleeve including a locking groove, a second joint, and an outer pipe; the first joint of the first joint assembly is in threaded connection to the cable bridle, and the second joint is in threaded connection to the outer pipe. The connecting sleeve is disposed inside the outer pipe and is connected to the first joint through the guide key. The second joint assembly includes a plurality of locking claws, a third joint, and a head.

Abstract: A cart comprises a body structure and at least one wheel connecting structure. The body structure comprises a support shaft, a first frame member and a second frame member. Both the first and second frame members are disposed on the support shaft. The wheel connecting structure is disposed on one end of the support shaft and comprises a driving assembly, a rotating assembly, a linking assembly, and an energy assembly. The driving assembly is connected to the first frame member. One end of the rotating assembly is disposed in correspondence with the one end of the support shaft, and the other end of the rotating assembly is mounted on a wheel member. The linking assembly is disposed between the driving assembly and the rotating assembly. The linking assembly comprises a pushing unit, which is pivotally connected to the rotating assembly. The energy assembly is connected to the linking assembly.

Abstract: Disclosed is a cart of a telescopic structure, comprising: a telescopic rod; a telescopic tube, where at least one of the telescopic tube and the telescopic rod have a hollow structure acting as an accommodation space that is required when the telescopic tube and the telescopic rod collapse into each other; a linkage mechanism connected to one end of the telescopic tube that is away from the hollow structure, and connected to one end of the telescopic rod that is close to the hollow structure; and a frame connected to the linkage mechanism. When the frame is rotated with respect to the linkage mechanism and collapses, the telescopic tube is also rotated with respect to the linkage mechanism, and one of the telescopic tube and the telescopic rod is retracted into the other thereof by means of the linkage mechanism.

Abstract: A perforating device includes a release sub, a rotating segment, a first centralizer, a braking segment, a casing collar locator, a traction mechanism, a second centralizer, a flex joint, a power supply segment, a shock absorber, a perforator, and a tail segment, which are in threaded connection sequentially to each other. The first joint assembly includes a first joint, a guide key, a connecting sleeve including a locking groove, a second joint, and an outer pipe; the first joint of the first joint assembly is in threaded connection to the cable bridle, and the second joint is in threaded connection to the outer pipe. The connecting sleeve is disposed inside the outer pipe and is connected to the first joint through the guide key. The second joint assembly includes a plurality of locking claws, a third joint, and a head.

Abstract: Disclosed is a cart of a telescopic structure, comprising: a telescopic rod; a telescopic tube, where at least one of the telescopic tube and the telescopic rod have a hollow structure acting as an accommodation space that is required when the telescopic tube and the telescopic rod collapse into each other; a linkage mechanism connected to one end of the telescopic tube that is away from the hollow structure, and connected to one end of the telescopic rod that is close to the hollow structure; and a frame connected to the linkage mechanism. When the frame is rotated with respect to the linkage mechanism and collapses, the telescopic tube is also rotated with respect to the linkage mechanism, and one of the telescopic tube and the telescopic rod is retracted into the other thereof by means of the linkage mechanism.

Abstract: A cart comprises a body structure and at least one wheel connecting structure. The body structure comprises a support shaft, a first frame member and a second frame member. Both the first and second frame members are disposed on the support shaft. The wheel connecting structure is disposed on one end of the support shaft and comprises a driving assembly, a rotating assembly, a linking assembly, and an energy assembly. The driving assembly is connected to the first frame member. One end of the rotating assembly is disposed in correspondence with the one end of the support shaft, and the other end of the rotating assembly is mounted on a wheel member. The linking assembly is disposed between the driving assembly and the rotating assembly. The linking assembly comprises a pushing unit, which is pivotally connected to the rotating assembly. The energy assembly is connected to the linking assembly.

Abstract: An off-grid power generating apparatus is provided. The apparatus includes an engine, an alternator and an excitation control device. The alternator includes a rotor, a switch and a stator. The switch is movable between a first position and a second position. An output portion of the stator has first and second segments each of which has at least one coil. The first and second segments are operatively and separately connected with the switch. The first and second segments are connected in series at the first position and in parallel at the second position to provide a high voltage and a low voltage respectively. The excitation control device controls the output voltage to make it have a predetermined frequency, and to regulate the engine speed in response to the load power of the engine.

Abstract: A power generating apparatus is provided. The alternator includes a rotor, a stator, one or more sensors and an electrical circuit. The rotor includes a plurality of symmetric phase windings while the stator has a single phase winding. The excitation control device is configured to control the induced voltage generated in the stator by regulating the rotating magnetic field generated in the phase windings of the rotor. The excitation control device is also configured to regulate the engine speed responsive to calculated load power. The electrical circuit connects the single phase winding of the stator and the load and is configured in a way that the induced voltage generated in the single phase winding and the output voltage applied to the load are at the same frequency. This arrangement reduces costs of the apparatus.

Abstract: A power generating apparatus is provided. The alternator includes a rotor, a stator, one or more sensors and an electrical circuit. The rotor includes a plurality of symmetric phase windings while the stator has a single phase winding. The excitation control device is configured to control the induced voltage generated in stator by regulating the rotating magnetic field generated in the phase windings of the rotor. The excitation control device is also configured to regulate the engine speed responsive to calculated load power. The electrical circuit connecting the single phase winding of the stator and the load is configured in a way that the induced voltage generated in the single phase winding and the output voltage applied to the load are at the same frequency. This arrangement reduces costs of the apparatus.

Abstract: A power generating apparatus and vector control method thereof are provided. The apparatus includes a rotor with plurality of symmetric phase windings, a stator with a single phase winding, sensors and an excitation control device. Current sensors on the stator side and on the rotor side are configured to measure the amplitudes of the load current and the phase current of the rotor respectively. A position sensor is configured to measure the angle of the rotor. The excitation control device is configured to regulate the engine speed responsive to load power. The excitation control device also generates a modulating signal in accordance with the target voltage vector of the rotor and the slip angle and regulates the excitation current in the phase windings of the stator with the modulating signal.

Abstract: A method for profiling network traffic. The method includes capturing, from the network traffic using a packet capturing device, a plurality of packets, identifying a first portion of the plurality of packets as a first flow based at least on a common Internet Protocol (IP) address assigned to each packet of the first flow by a network address translation (NAT) device, extracting, by a hardware processor separate from the NAT device and based on an NAT profile of the NAT device, a first data item from the first flow, wherein the first data item is inserted into the first flow by the NAT device for identifying a first host device coupled to the NAT device, and determining, by the hardware processor based on the first data item, that the first flow is generated by the first host device.

Abstract: A method for classifying network traffic in a network. The method includes obtaining, from an application distribution source, an application distribution data set of comprising information associated with distributing an application from the pre-determined application distribution source, extracting, based on a pre-determined extraction criterion, a token from the application distribution data set of the application, obtaining, from the network traffic, a plurality of flows generated by the application, extracting, in response to detecting the token in a flow of the plurality of flows, context information associated with the token in the flow, and generating an identification rule of the application based on the token and the context information, wherein the identification rule describes one or more rule steps to locate the token in the flow, wherein the network traffic is classified using at least the identification rule.

Abstract: A handbrake structure includes a fixing base, a linking member and a brake handle. The fixing base is located on a handle of a moving apparatus. The linking member is located on the fixing base, wherein a first portion of the linking member is connected to a first brake wire, and a second portion of the linking member has a first limit part. The brake handle is located on the linking member, wherein a first portion of the brake handle is connected to a second brake wire. When the brake handle is rotated in a first direction, the brake handle pushes the first limit part to rotate the linking member, and the linking member pulls the first brake wire. When the brake handle is rotated in a second direction different from the first direction, the brake handle pulls the second brake wire.

Abstract: A power generating apparatus is provided. The alternator includes a rotor, a stator, one or more sensors and an electrical circuit. The rotor includes a plurality of symmetric phase windings while the stator has a single phase winding. The excitation control device is configured to control the induced voltage generated in the stator by regulating the rotating magnetic field generated in the phase windings of the rotor. The excitation control device is also configured to regulate the engine speed responsive to calculated load power. The electrical circuit connects the single phase winding of the stator and the load and is configured in a way that the induced voltage generated in the single phase winding and the output voltage applied to the load are at the same frequency. This arrangement reduces costs of the apparatus.