Abstract: A control method and device, a system, a movable platform, and a storage medium are provided, the method includes: controlling a movable platform to follow a target while maintaining a first relative distance and a first relative orientation with respect to the target; controlling the movable platform to move toward or away from the target based on a target trajectory from the first relative distance and the first relative orientation, so that the movable platform moves to a second relative distance and a second relative orientation with respect to the target; controlling the movable platform to follow the target while maintaining the second relative distance and the second relative orientation; the first relative distance and the second relative distance are different, and the first relative orientation and the second relative orientation are different.

Abstract: A method includes: The receive end receives 2N channels of signals through N first antennas, where the 2N channels of signals are respectively from N second antennas of the transmit end. When transmission performance of any one of the 2N channels of signals is less than a first threshold, the receive end respectively receives, from two second antennas, two channels of signals whose polarization directions are orthogonal. When transmission performance of the two channels of signals is both greater than a second threshold, the receive end receives the 2N channels of signals through the N first antennas.

Abstract: A control method of an aerial vehicle. The aerial vehicle includes a gimbal carrying an image acquisition device. The method includes obtaining a preliminary-flight trajectory of the aerial vehicle and control information of the gimbal that are set by a user, automatically controlling the aerial vehicle to move according to the preliminary-flight trajectory, and automatically controlling the gimbal and the image acquisition device to photograph a target object according to the control information of the gimbal.

Abstract: A cracking reaction device includes a preheating section, a lightening section, a reduced-pressure gasification section and a cracking section that are connected sequentially. A method for producing olefins by cracking involves pressurizing a cracking feedstock and water; subjecting the pressurized cracking feedstock and water to a first heating; subjecting the first heated cracking feedstock and water to a second heating and lightening the cracking feedstock in the presence of water to obtain a lightened mixture; gasifying the lightened mixture under a reduced pressure and subjected to a third heating to obtain a third heated mixture; and cracking the third heated mixture at a cracking temperature in the presence of steam to obtain a cracked product containing olefins.

Abstract: An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, and the negative electrode mixture layer includes a negative electrode active substance. An elongation at a yield point of the negative electrode mixture layer and D50 of the negative electrode active substance satisfy a specified relationship, and the electrolyte includes a compound having a cyano group.

Abstract: An electrochemical device includes a negative electrode. The negative electrode includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector. In an infrared spectroscopy test, the negative active material layer exhibits at least a first peak and a second peak in a wavenumber range of 2500 cm?1 to 3200 cm?1. This indicates that the negative active material layer contains an additive, and the additive increases the production efficiency of the negative electrode, thereby increasing the production efficiency of the electrochemical device. In addition, the electrochemical device exhibits a high discharge capacity.

Abstract: An electrochemical device includes a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a current collector, a tab, and an active layer. The tab is electrically connected to and extends out of the current collector. The active layer is disposed on a surface of the current collector. The active layer includes a first active layer and a second active layer. In a first direction, the first active layer is located on a side of the second active layer facing the tab, and is adjacent to or partially overlaps the second active layer. In a second direction, the first active layer and the second active layer extend in a strip shape. The cohesive force of the first active layer is greater than the cohesive force of the second active layer.

Abstract: The present disclosure provides a preparation method of spherical ?-alumina with a low viscosity and a high thermal conductivity. In the preparation method, a spherical ?-alumina powder is obtained through spheroidization by melting using an angular ?-alumina powder as a raw material; and the spherical ?-alumina powder is calcined at a high temperature to obtain the spherical ?-alumina with a low viscosity and a high thermal conductivity. In the present disclosure, a spheroidization rate and an ?-phase are kept unchanged by adjusting a calcination temperature and a calcination time, while improving the thermal conductivity of the alumina and not affecting a viscosity of products such as thermal conductive films prepared from the alumina as a filler.

Abstract: A road data processing method, a device, and a storage medium are provided, and relate to the technical fields of intelligent transportation, cloud computing and spatiotemporal big data. The road data processing method includes: acquiring vehicle travelling trajectories of a road and a corresponding road unit in a road network; establishing a road vertical line for the road unit, and determining points of intersection of the vehicle travelling trajectories and the road vertical line; determining a width area of the road on the road vertical line according to position data of the points of intersection; and determining a midpoint of the width area as a road center point corresponding to the road vertical line.

Abstract: An electrochemical apparatus includes a negative electrode. The negative electrode includes a current collector, a first coating, and a second coating, the second coating is provided on at least one surface of the current collector, and the first coating is provided between the current collector and the second coating and contains inorganic particles with a Mohs hardness of 2 to 7.

Abstract: The present invention discloses a system for bridge scour multi-source monitoring, including an intelligent monitoring system, a data industrial personal computer, a 5G remote communication transmission system and a remote scour depth evaluation center. The intelligent monitoring system consists of three subsystems including a high-frequency real-time bridge dynamic characteristic monitoring system, an adjustable sound velocity underwater depth monitoring system and a scoured seabed soil pressure change testing system, which are coupled with one another to carry out triggering control to acquire lateral pile data, thereby forming a multi-source bridge local scour real-time sensing monitoring system, and realizing integration of clock synchronization, dynamic control of scour environment conditions, contact sensors and non-contact sensors.

Abstract: A negative electrode includes a current collector and an active substance layer arranged on the current collector, and an ionic conductivity of the active substance layer is 0.01 S/m to 1 S/m. The ionic conductivity of the active substance layer is defined as 0.01 S/m to 1 S/m, so that the electrochemical device can meet requirements for fast charging, and meanwhile, lithium plating on a surface of the negative electrode of the electrochemical device can be inhibited in a fast-charging condition, ensuring safety performance of the electrochemical device.

Abstract: An electrode plate includes a current collector and a membrane, where the membrane includes a primer layer provided on a surface of the current collector and an active substance layer provided on a surface of the primer layer, and the primer layer includes a first binder and a first conductive agent; where adhesion between the membrane and the current collector is greater than or equal to 20 N/m. This electrode plate can alleviate problems in the prior art such as easy film fall-off of the electrode plate due to low adhesion of part of the active material close to the surface of the electrode current collector.

Abstract: An electrochemical apparatus includes a positive electrode, a negative electrode, and an electrolyte, the negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, the negative electrode mixture layer includes a negative electrode active substance, there is specific adhesion strength for the negative electrode active substance, and the electrolyte includes propionate. The electrochemical apparatus has improved high-temperature storage performance and overcharge protection performance.

Abstract: An electrochemical apparatus includes a negative electrode, where the negative electrode includes a current collector, a first coating, and a second coating. The second coating is provided on at least one surface of the current collector. The first coating is provided between the current collector and the second coating, and the first coating includes inorganic particles. A peeling force F between the first coating and the second coating satisfies 15 N?F?30 N. The first coating is provided between the current collector and the second coating of the negative electrode, and the first coating contains the inorganic particles, effectively enhancing adhesion between the current collector and the second coating, reducing the binder amount in the second coating, and increasing the proportion of a negative electrode active material in the negative electrode, thereby increasing the energy density of lithium-ion batteries.

Abstract: The present disclosure provides a method and an apparatus for monitoring road data, an electronic device and a storage medium, and relates to the field of intelligent transportation. A specific implementation solution involves: acquiring a feature expression of a road; predicting, according to the feature expression of the road and a pre-trained change prediction model, a probability that road data of the road will change; and collecting the road data of the road based on the probability that the road data will change.

Abstract: A method for cracking crude oil includes delivering the crude oil to a first tube group of a convection section of a cracking furnace for preheating and then performing vaporization to obtain a first gas phase and a first liquid phase; performing high-pressure extraction on the first liquid phase to obtain a non-asphalt oil and an asphalt; and mixing the first gas phase and the non-asphalt oil with water vapor respectively, or mixing the first gas phase with the non-asphalt oil prior to mixing with water vapor, then delivering the same to a second tube group of the convection section of the cracking furnace for heating, followed by delivering same to a radiation section of the cracking furnace for cracking to obtain a cracked product, and separating the cracked product to obtain low-carbon olefins.

Abstract: This disclosure details exemplary adjustable glass track systems for vehicles. In some embodiments, the glass track systems may establish a continuous sealing plane relative to a glass pane of a frameless door. In other embodiments, the glass track systems may additionally establish a continuous sealing plane relative to a vehicle roof structure. Exemplary adjustable glass track systems may include, among other features, a tubular frame rail, a channel rail, appliques, and seals.

Abstract: A method includes: The receive end receives 2N channels of signals through N first antennas, where the 2N channels of signals are respectively from N second antennas of the transmit end. When transmission performance of any one of the 2N channels of signals is less than a first threshold, the receive end respectively receives, from two second antennas, two channels of signals whose polarization directions are orthogonal. When transmission performance of the two channels of signals is both greater than a second threshold, the receive end receives the 2N channels of signals through the N first antennas.

Abstract: An electrochemical apparatus, including a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, and the negative electrode mixture layer includes a negative electrode active substance. An elongation at a yield point of the negative electrode mixture layer and D50 of the negative electrode active substance satisfy a specified relationship, and the electrolyte includes a compound having a cyano group.