Abstract: A motor driving method includes steps of: at an open loop phase and in response to a motor being operated under a steady-state, calculating an angle difference between an estimation coordinate axis of the motor and an actual coordinate axis by a controller, according to an estimation voltage value, an estimation current value and at least one electrical parameter feedback from the motor and in reference with the estimation coordinate axis of the motor; calculating an actual current value in reference with the actual coordinate axis according to the angle difference by the controller; calculating a load torque estimation value associated with the motor according to the actual current value by the controller; and, in response to the open loop phase being switched to a close loop phase, compensating an output torque of the motor according to the load torque estimation value by the controller.

Abstract: Data storage and calling methods and devices are provided. One of the methods includes: receiving first motion data and business data; establishing an association relationship between the first motion data and the business data and storing the association relationship; receiving second motion data; and determining first motion data that matches the second motion data, and returning, to a sender of the second motion data, business data associated with the matched first motion data.

Abstract: A fault detection method is used to determine whether a power switch coupled to a DC bus of a power conversion circuit is faulted. The method includes: detecting a bus voltage to provide a voltage signal and acquiring at least one detection value according to the voltage signal; providing control signals sequentially to turn off or turn on the power switch; determining that the power switch is a short-circuit fault if a first detection value is greater than or equal to a first threshold value when the power switch is turned off; determining that the power switch is an open-circuit fault if a second detection value is less than a second threshold value when the power switch is turned on; and providing an alarm signal or a disable signal when the power switch is the short-circuit fault or the open-circuit fault.

Abstract: Computer-implemented methods, computer-implemented systems, and non-transitory, computer-readable media for processing interaction sequence data are disclosed. One computer-implemented method includes: obtaining a dynamic interaction graph is obtained, where the dynamic interaction graph is constructed based on a dynamic interaction sequence, including a plurality of interactions arranged in a chronological order, where each interaction includes two objects involved in the interaction and a time of the interaction. In the dynamic interaction graph, a sub-graph corresponding to a target node is determined, where nodes in the sub-graph comprise the target node and connection nodes connected to the target node through a predetermined amount of edges originating from the target node. A feature vector corresponding to the target node is determined based on a node feature of each of the nodes of the sub-graph and directions of edges of the sub-graph.

Abstract: An information processing apparatus includes a receiving unit configured to receive, from a terminal of a delivery requester of a battery, a delivery request for a battery for which a delivery location of the battery is designated, a selecting unit configured to select at least one storage location of a battery, and a specifying unit configured to specify a deliverer who delivers the battery from a storage location. The specifying unit is configured to transmit a delivery inquiry including information of the delivery location and the storage location to a terminal of a delivery candidate, and specify the delivery candidate as the deliverer. When the selecting unit selects a plurality of storage locations for one delivery, the delivery inquiry includes information of each storage location.

Abstract: An estimation method for estimating a rotor frequency of a motor during freewheeling, includes: applying a fixed input voltage and one selected from a plurality of stator frequencies to the motor sequentially so as to perform frequency scanning; detecting a stator current value of the motor corresponding to the selected stator frequency; calculating a stator current slope of the stator current values sequentially; defining a target period from a start point where the stator current slope varies from positive to negative to an end point where the stator current slope varies from negative to positive; and determining that a difference between the scanned stator frequency and the rotor frequency is within a preset value, then designating any of the corresponding stator frequencies during the target period as an estimated value of the rotor frequency.

Abstract: The present disclosure provides feature data processing methods and devices. One exemplary feature data processing method comprises: classifying features into an important feature set and an auxiliary feature set according to information attribute values of the features; converting features in the auxiliary feature set to hash features; and combining the hash features with features in the important feature set, and setting the combined features as fingerprint features. Training and prediction of to-be-processed data can be performed based on the fingerprint features. With the embodiments of the present disclosure, training dimensions can be more controllable and the amount training data amount can be reduced. Therefore, the efficiency of data processing can be improved.

Abstract: An operation monitoring system and monitoring method are provided, the operation monitoring system is used for monitoring at least one agricultural machine, so as to control an operating range of the agricultural machine, the operation monitoring system includes a storage device and a processor, the processor recognizes at least one operating area and at least one non-operating area of an operation environment, and generates at least one boundary between the operating area and the non-operating area, the processor further generates least one electronic fence at the at least one boundary, the processor further acquires the position of the electronic fence and monitors a position of the agricultural machine, so as to monitor whether the agricultural machine is operating in the operating area on a side of the electronic fence, thereby controlling the operating range of the agricultural machine.

Abstract: A farm management system and a management method thereof, wherein the management method includes the following steps: step 801: dividing a leasable arable land (110) of a farm (100) into at least one leased area (201); step 802: integrating the arable land needs of one or more customers for crops to form at least one farm (100) leased arable land allocation plan; step 803: selecting the lease area (201) of the farm (100) for at least one crop planted by the customer; step 804: managing the customer's lease of farmland and managing the customer's crops; and step 805: paying fees to the farm manager.

Abstract: A route management system (100) and a management method thereof. The route management system (100) is used for at least one agricultural machine (202) to provide an operation route for the operation of the agricultural machine (202), and includes an environment analyzing module (102) and an operating route planning module (103). The environment analyzing module (102) analyzes the information of at least one to-be-operated area (201) and generates at least one environment data. The operating route planning module (103) is communicatively connected to the environment analyzing module (102) to plan, according to the environment data, at least one operating route of the to-be-operated area (201). The agricultural machine (202) can operate in the to-be-operated area (201) according to the operation route.

Abstract: A farm lease system and a lease management method that enables a user to lease a farmable area to grow a crop. The farm lease system includes a leasing unit (10) and a management and control unit (20). The leasing unit (10) includes a planting selection module (12), the planting selection module (12) can offer and allow selection of the type or types of the crop. The management and control unit (20) matches and controls growth of the crop according to the selected result of the planting selection module.

Abstract: Computer-implemented methods, computer-implemented systems, and non-transitory, computer-readable media for processing interaction sequence data are disclosed. One computer-implemented method includes: obtaining a dynamic interaction graph is obtained, where the dynamic interaction graph is constructed based on a dynamic interaction sequence, including a plurality of interactions arranged in a chronological order, where each interaction includes two objects involved in the interaction and a time of the interaction. In the dynamic interaction graph, a sub-graph corresponding to a target node is determined, where nodes in the sub-graph comprise the target node and connection nodes connected to the target node through a predetermined amount of edges originating from the target node. A feature vector corresponding to the target node is determined based on a node feature of each of the nodes of the sub-graph and directions of edges of the sub-graph.

Abstract: A method for obtaining metallic carbon nanotubes is provided. An insulating substrate comprising hollow portions and non-hollow portions is provided. A plurality of electrodes is formed on a surface of the non-hollow portions. A plurality of carbon nanotubes is formed on a surface of the insulating substrate, and the carbon nanotubes stretch across the hollow portions. The insulating substrate, the plurality of electrodes and the carbon nanotubes are placed into a cavity, and the cavity is evacuated. A voltage is applied between any two electrodes, and photos of carbon nanotubes suspended between the two electrodes are taken. In the photo, darker ones are semiconducting carbon nanotubes, and brighter ones are metallic carbon nanotubes. Finally, the semiconducting carbon nanotubes are removed.

Abstract: A method and system for synchronizing downhole tractor and surface winch deployment includes inserting into a wellbore a tool string connected to a wireline, the tool string comprising a variable speed tractor, deploying the tractor, deploying the wireline from a winch; dynamically monitoring, by a device disposed downhole, a wireline tension as an indicator of synchronization of the tractor and winch, and adjusting, by the device, the tractor speed in response to a disparity in tension to match the winch speed.

Abstract: Disclosed herein is a system for measuring a microwave dielectric property of a solid material under force. The system measures the microwave dielectric property of the solid material under a horizontal pressure. A shield case for microwave electromagnetic shielding is provided outside the system. The shield case includes a layer of pure aluminum and a layer of pyramids made of a microwave absorbing material. A manual hydraulic pump controls loading and unloading of a pressure loading device.

Abstract: Downhole tractor control systems and methods to adjust a load of a downhole motor to drive one or more wheels of the downhole tractor are disclosed. A method to adjust a load of a downhole motor includes receiving a user input of a desired speed and torque for a plurality of motors, where the plurality of motors powering rotation of wheels of a downhole tractor. The method also includes determining a minimum actual motor speed of the plurality of motors. For at least one motor of the plurality of motors, the method includes determining a power controller output and determining a torque controller output. The method further includes adjusting a voltage source invertor based on a lesser of the power controller output and the torque controller output to modulate voltage provided to the at least one motor.

Abstract: A method for obtaining semiconducting carbon nanotubes is provided. An insulating substrate comprising hollow portions and non-hollow portions is provided. A plurality of electrodes is formed on a surface of the non-hollow portions. A plurality of carbon nanotubes is formed on a surface of the insulating substrate, and the carbon nanotubes stretches across the hollow portions. The insulating substrate, the plurality of electrodes, and the carbon nanotubes are placed into a cavity, and the cavity is evacuated. A voltage is applied between any two electrodes, and photos of carbon nanotubes suspended between the two electrodes are taken. In the photo, darker ones are the semiconducting carbon nanotubes, and brighter ones are metallic carbon nanotubes. Finally, the metallic carbon nanotubes are removed.

Abstract: Computer-implemented methods, computer-implemented systems, and non-transitory, computer-readable media for processing interaction sequence data are disclosed. One computer-implemented method includes: obtaining a dynamic interaction graph is obtained, where the dynamic interaction graph is constructed based on a dynamic interaction sequence, including a plurality of interactions arranged in a chronological order, where each interaction includes two objects involved in the interaction and a time of the interaction. In the dynamic interaction graph, a sub-graph corresponding to a target node is determined, where nodes in the sub-graph comprise the target node and connection nodes connected to the target node through a predetermined amount of edges originating from the target node. A feature vector corresponding to the target node is determined based on a node feature of each of the nodes of the sub-graph and directions of edges of the sub-graph.

Abstract: Computer-implemented methods, computer-implemented systems, and non-transitory, computer-readable media for processing interaction sequence data are disclosed. One computer-implemented method includes: obtaining a dynamic interaction graph is obtained, where the dynamic interaction graph is constructed based on a dynamic interaction sequence, including a plurality of interactions arranged in a chronological order, where each interaction includes two objects involved in the interaction and a time of the interaction. In the dynamic interaction graph, a sub-graph corresponding to a target node is determined, where nodes in the sub-graph comprise the target node and connection nodes connected to the target node through a predetermined amount of edges originating from the target node. A feature vector corresponding to the target node is determined based on a node feature of each of the nodes of the sub-graph and directions of edges of the sub-graph.

Abstract: Data storage and calling methods and devices are provided. One of the methods includes: receiving first motion data and business data; establishing an association relationship between the first motion data and the business data and storing the association relationship; receiving second motion data; and determining first motion data that matches the second motion data, and returning, to a sender of the second motion data, business data associated with the matched first motion data.