Abstract: A riding mowing device includes a seat used for a user to sit on and including a seat cushion and a backrest; a frame for supporting the seat; a cutting assembly including a cutting deck and a mowing element for mowing grass, where the mowing element is at least partially accommodated in the cutting deck, and the cutting assembly is mounted to the frame; a traveling assembly for driving the riding mowing device to travel; a control circuit board for controlling at least the cutting assembly and the traveling assembly; and a power supply assembly for supplying power to at least the cutting assembly and the traveling assembly. At least part of the control circuit board is disposed between the seat and the power supply assembly.

Abstract: A charging system includes at least one first charging device and at least one second charging device that are cascaded. The first charging device includes at least one first accommodation portion for mounting a first energy storage device and a connecting port for connecting the second charging device or the first charging device. The second charging device includes at least one second accommodation portion for mounting a second energy storage device and a connecting port for connecting the first charging device or the second charging device. The first accommodation portion and the second accommodation portion have different shapes or dimensions.

Abstract: A method or system for estimating delays in design under tests (DUTs) using machine learning. The system accesses multiple DUTs, each comprising various logic blocks. For each DUT, a combinatorial path is identified, connecting one or more logic blocks. A feature vector is generated, including values of orthogonal features representing the combinatorial path's characteristics. Each DUT is compiled for emulation, and the delay of its combinatorial path is measured. These measured delays, along with the corresponding feature vectors, are used to train a machine learning delay model. The trained model is designed to receive a combinatorial path of a DUT as input and generate an estimated wire delay as output. This approach leverages machine learning to predict delays in electronic designs, improving the efficiency and accuracy of delay estimations in complex circuits.

Abstract: A charging system includes at least one first charging device and at least one second charging device that are cascaded. The first charging device includes at least one first accommodation portion for mounting a first energy storage device and a connecting port for connecting the second charging device or the first charging device. The second charging device includes at least one second accommodation portion for mounting a second energy storage device and a connecting port for connecting the first charging device or the second charging device. The first accommodation portion and the second accommodation portion have different shapes or dimensions.

Abstract: One aspect provides a system and method for provisioning an access point (AP) in a wireless mesh network. During operation, a controller can obtain a set of published global encryption parameters comprising a master public key, apply an identity-based encryption (IBE) scheme to encrypt a configuration message based at least on the master public key, and transmit the encrypted configuration message to a proxy device, which forwards the encrypted configuration message to the AP. The proxy device is coupled to the controller via a previously established secure communication channel and coupled to the AP via an open communication channel. The AP can decrypt the encrypted configuration message using an AP-specific secret key generated based on a unique identifier of the AP and a master private key corresponding to the master public key, thereby facilitating provisioning of the AP based on the configuration message.

Abstract: A method, circuit, audio playback device, and system of sending and receiving Bluetooth packet loss data is disclosed. The method includes: step S100, receiving a forwarding request sent by a second audio playback device in a receiving state; step S200, monitoring the retransmission information of an audio source device retransmitting current audio data on Link 1 according to the forwarding request; step S300, determining whether the retransmission information is monitored; step S400, switching from the receiving state to a sending state; and step S500, forwarding the current audio data to the second audio playback device through Link 2 in accordance with the time sequence of the audio source device retransmitting the current audio data. The signal can be provided to the second audio playback device from different locations.

Abstract: A vehicle braking energy recovering method includes obtaining current location information of a vehicle, determining a current road scenario based on the current location information of the vehicle, determining the current road scenario based on a mapping relationship between a road scenario and a weight, determining a safe distance and a safe speed of the vehicle based on the weight, determining a target torque based on the safe distance and the safe speed of the vehicle, and controlling, based on the target torque, a motor of the vehicle to recover braking energy.

Abstract: A battery pack for powering an outdoor moving includes: a housing mounted to the outdoor moving device and supported by the outdoor moving device; and a cell module mounted to the housing and including multiple cells. A cell is cylindrical and the diameter of the cell is greater than or equal to 3 cm.

Abstract: Disclosed are a clamping device of a stereoscopic wound iron core transformer and a transformer. The clamping device includes a lower frame, a plurality of upper platen assemblies and a plurality of screw assemblies. The lower frame is configured for being arranged at lower sides of a plurality of coil windings of the stereoscopic wound iron core transformer, the plurality of upper platen assemblies are configured for being distributed at upper sides of the plurality of coil windings, and the lower frame and the upper platen assemblies are connected through the screw assemblies, so as to clamp the coil windings together.

Abstract: The present invention provides a dehydrogenase mutant L283V/L286V, and a preparation method and use thereof, and relates to the field of biomedicine technologies. An amino acid sequence of the mutant L283V/L286V is as shown in SEQ ID NO: 1; and the mutant is prepared by simultaneously mutating 283rd and 286th leucine of a dehydrogenase with an amino acid sequence as shown in SEQ ID NO: 3 into valine. The dehydrogenase mutant L283V/L286V shows high selectivity in catalyzing myosmine reduction reaction in a whole cell system to produce S-nornicotine, and has relatively high dehydrogenase and imine reductase activities, a short enzyme reduction time, and a high transformation rate. The product S-nornicotine obtained through the reaction has extremely high optical purity, which reduces the operation difficulty of subsequent purification.

Abstract: The present invention provides a dehydrogenase mutant L283V/L286V, and a preparation method and use thereof, and relates to the field of biomedicine technologies. An amino acid sequence of the mutant L283V/L286V is as shown in SEQ ID NO: 1; and the mutant is prepared by simultaneously mutating 283rd and 286th leucine of a dehydrogenase with an amino acid sequence as shown in SEQ ID NO: 3 into valine. The dehydrogenase mutant L283V/L286V shows high selectivity in catalyzing myosmine reduction reaction in a whole cell system to produce S-nornicotine, and has relatively high dehydrogenase and imine reductase activities, a short enzyme reduction time, and a high transformation rate. The product S-nornicotine obtained through the reaction has extremely high optical purity, which reduces the operation difficulty of subsequent purification.

Abstract: Disclosed are sodium salts of pyrimidine derivatives, and a series of crystal forms thereof. The series of crystal forms exhibit a good druggability, such as stability, fluidity, compressibility, etc., and provide a variety of options of APIs for subsequent drug product development.

Abstract: A vehicle braking energy recovering method includes obtaining current location information of a vehicle, determining a current road scenario based on the current location information of the vehicle, determining the current road scenario based on a mapping relationship between a road scenario and a weight, determining a safe distance and a safe speed of the vehicle based on the weight, determining a target torque based on the safe distance and the safe speed of the vehicle, and controlling, based on the target torque, a motor of the vehicle to recover braking energy.

Abstract: Disclosed is crystal form M of the proline hydroxylase inhibitor daprodustat, wherein the X-ray powder diffraction thereof, expressed in 2? angles and using Cu-Ka radiation, has characteristic peaks at 4.7±0.2°, 6.5±0.2°, and 6.8±0.2°. Disclosed are the preparation method for and the use of crystal form M. The crystal form M has good light stability, high temperature stability and high humidity stability, good solubility, and high purity.

Abstract: Provided are a crystal form of a gonadotropin releasing hormone antagonist, a preparation method therefor, and use thereof. A crystal form C and a crystal form D have high purity, good illumination stability, high temperature stability, and high humidity stability, and have good solubility and low hygroscopicity; the saturation solubility of the crystal form C and the crystal form D is 101.75 ?g/ml and 87.21 ?g/ml, respectively; when the relative humidity is increased from 0 to 50% RH, the hygroscopy gain of the crystal form C and the crystal form D is not greater than 1.76% and 0.73%, respectively; and when the relative humidity is increased from 0 to 90% RH, the hygroscopy gain of the crystal form C and the crystal form D is not greater than 3.43% and 1.61%, respectively. Therefore, the control of a production condition is facilitated, the preparation process is simple, the quality is stable, and large-scale industrial production is easy.

Abstract: Disclosed are eutectic form A of Elagolix and pyrimethamine, a preparation method therefor and a use thereof. Using Cu-K? radiation, eutectic form A has characteristic peaks represented by a 20 degree at 8.1±0.2°, 12.2±0.2°, 13.3±0.2° and 21.1±0.2° in an X-ray powder diffraction. Eutectic form A has a high purity, a good light radiation stability, a high temperature stability, a high humidity stability and an accelerated stability, is easy to store, and has a slow moisture absorption under the condition of relatively low humidity, wherein the weight gain of eutectic form A by moisture absorption is not more than 1.08% when the relative humidity increases from 0 to 60% RH. Production conditions for eutectic form A are easy to control, same has a simple preparation process and a stable quality, and is easy to industrially produce on a large-scale.

Abstract: A crystal form X of 3?-hydroxy-3?-methyl-21-(4-cyano-1H-pyrazol-1?-yl)-19-nor-5?-pregnan-20-one, a preparation method of said crystal form and an application thereof in preparing a drug for treatment of central nervous system disease.

Abstract: A vehicle braking energy recovering method includes obtaining current location information of a vehicle, determining a current road scenario based on the current location information of the vehicle, determining the current road scenario based on a mapping relationship between a road scenario and a weight, determining a safe distance and a safe speed of the vehicle based on the weight, determining a target torque based on the safe distance and the safe speed of the vehicle, and controlling, based on the target torque, a motor of the vehicle to recover braking energy.

Abstract: A crystal form A of 2-(2, 5-dioxopyrrolidin-1yl)ethyl methyl fumarate has a good light irradiation stability, high-temperature stability and high-humidity stability.

Abstract: A crystalline form A of 2,2-bis(4-fluorophenyl)-2-phenylacetamide is provided. The crystalline form has good light stability, high temperature stability, and high humidity stability.