Abstract: A method for screening a key stratum for overburden separation grouting in a coal mine includes: selecting overall analysis objects based on coal mine planning; conducting a primary screening of the analysis objects based on a scope of a subsidence zone; conducting a secondary screening of the analysis objects based on whether there is an old goaf; determining key stratums for screened-in analysis objects, prioritizing the key stratums based on a number of separation spaces and a range of a separation height, setting a safe height based on a diversion fissure zone, and prioritizing numbers of groutable layers based on a potential separation space and a water resistance of a rock stratum; prioritizing the groutable layers based on a fault impact; and comprehensively analyzing grouting priority levels of the key stratums based on results of the three prioritizations, and grouting separation layers of the key stratums in order of priority.

Abstract: An integrated plugging and perforating operation system is provided, including an operation truck, a wellhead equipment pry, and a centralized control room. A mechanical mechanism and a power mechanism are arranged on a chassis of the operation truck. The mechanical mechanism includes a turntable assembly, where a telescopic arm assembly is installed on the turntable assembly, a mechanical arm assembly for logging operation is installed at an operating end of the telescopic arm assembly, and a logging winch assembly and a follow-up winch assembly are arranged at a counterweight end of the telescopic arm assembly to form a counter weight of the telescopic arm assembly. The power mechanism is configured for providing power output to the mechanical mechanism.

Abstract: Methods and systems for budgeted and simplified training of deep neural networks (DNNs) are disclosed. In one example, a trainer is to train a DNN using a plurality of training sub-images derived from a down-sampled training image. A tester is to test the trained DNN using a plurality of testing sub-images derived from a down-sampled testing image. In another example, in a recurrent deep Q-network (RDQN) having a local attention mechanism located between a convolutional neural network (CNN) and a long-short time memory (LSTM), a plurality of feature maps are generated by the CNN from an input image. Hard-attention is applied by the local attention mechanism to the generated plurality of feature maps by selecting a subset of the generated feature maps. Soft attention is applied by the local attention mechanism to the selected subset of generated feature maps by providing weights to the selected subset of generated feature maps in obtaining weighted feature maps.

Abstract: An optical system is provided, including a housing, an optical element, a first movable part, a driving assembly, and a temperature adjusting module. The optical element is disposed on the housing. The first movable part is movably connected to the housing. The driving assembly is configured to drive the first movable part to move relative to the housing. The temperature adjusting module is disposed in the housing for adjusting the temperature of the optical system.

Abstract: The present disclosure relates to a tire pressure sensor and a tire valve. The tire pressure sensor includes: a printed circuit board, a battery and a helical antenna assembly, where the printed circuit board, the battery and the helical antenna assembly are processed through an injection molding process to produce a sensor assembly. The helical antenna assembly includes an antenna support and a helical antenna on an outer sidewall of the antenna support. The antenna support is internally hollow, and a helical groove is provided on the outer sidewall of the antenna support. The helical antenna is wound in the helical groove. A plurality of fasteners for fixing the circuit board are at the bottom of the antenna support. A pressure sensing component and an antenna matching circuit are printed on the printed circuit board.

Abstract: A single-phase permanent magnet synchronous motor and dust collector. The single-phase permanent magnet synchronous motor includes a plurality of stator teeth, the plurality of stator teeth include at least: a first-type and second-type stator tooth; the first-type and second-type stator teeth enclose an annular working cavity for accommodating a rotor part, where the size of a central angle corresponding to a first contour line of an end face of the first-type stator tooth facing the rotor part is different from the size of a central angle corresponding to a second contour line of an end face of the second-type stator tooth facing the rotor part. The motor has a significantly reduced cogging torque, a greatly reduced torque ripple, and an obviously increased motor output torque. The single-phase permanent magnet synchronous motor is small in size, light in weight, simple in structure, convenient for large-scale manufacture and low in manufacturing cost.

Abstract: The present invention belongs to the field of power system operations and provides a method for quantifying the flexibility demand and coordinating optimization of a hydro-wind-solar multi-energy complementary system. Firstly, the flexibility demand quantification method considering the uncertainty of wind and solar power output is constructed, and the wind and solar power output interval is divided by using quantile points to generate a set of output scenarios, and then the flexibility demand under each scenario is calculated. Based on the quantitative index of flexibility demand, an optimal operation model of hydro-wind-solar complementary system considering the minimum expectation of system flexibility deficiency is constructed to realize the optimal calculation of hydro-wind-solar complementary. By utilizing an actual wind-hydro complementary system of the Yunnan Power Grid, the model is validated for different new energy access ratios.

Abstract: An androgen receptor (AR) binding molecule has the structure of Formula (I) shown in the following: wherein E is CH2, G is CH, is OH, NH2, OTf or C?C, X is CF3 or trifluoromethylphenyl, is a single bond, and Y and Z are CH2; or is absent, X is CF3, is a double bond, and Y and Z are CH.

Abstract: A method for dewatering a coal mine goaf by crossing a neighboring goaf is applicable to a scenario including a first goaf, a second goaf, and a third goaf located sequentially at one side of a roadway. A directional hole mechanism is provided between the roadway and the second goaf as well as between the roadway and the third goaf. The directional hole mechanism passes through a coal seam floor at a bottom of the goaf and is communicated to the second goaf and the third goaf. The directional hole includes a first directional hole and a second directional hole. The first directional hole is communicated to the second goaf, the second directional hole is communicated to the third goaf, and the first directional hole is provided with a casing structure.

Abstract: A related substance of linagliptin intermediate 2-(chloromethyl)-4-methylquinazoline, 4,4?-(2-methylpropane-1,3-diyl)bis(2-(chloromethyl)quinazoline) and a method for synthesizing the related substance (impurity) by reacting 2-(chloromethyl)-4-methylquinazoline with acetaldehyde under an alkaline condition and a purification method are provided. The preparation method is simple and convenient to operate, short in reaction time, high in product purity, and high in yield. The synthesized related substance can be used for qualitative and quantitative analysis of the linagliptin intermediate 2-(chloromethyl)-4-methylquinazoline and API impurities of linagliptin, so that the medication safety of the linagliptin is improved.

Abstract: A secondary frequency modulation method for a hydropower plant which satisfies positive correlation between a regulation rate and a rated capacity of the hydropower plant, three secondary frequency modulation gain methods are provided, in which feedforward gain regulation and amplification gain regulation call as many hydropower generating units as possible to participate in secondary frequency modulation, and avoid or restrain the problem that the power regulation sensitivity of an active power regulation dead zone of a single hydropower generating unit is weakened; transfer gain regulation transfers the regulation margin of the hydropower generating unit not participating in the secondary frequency modulation to the hydropower generating unit participating in the secondary frequency modulation within the limit of the active power regulation dead zone of a single hydropower generating unit, so that the latter can obtain a larger active power regulation range.

Abstract: A tertiary frequency modulation method for a power system, AGC based on power plant input performs active power regulation for tertiary frequency modulation in different modes in power plants in case of secondary frequency modulation failure of the power system and unidirectional deviation of grid frequency from rated frequency for a period: perform tertiary frequency modulation based on the reserved capacity of the secondary frequency modulation or the regulation amount of primary frequency modulation or random parameters. The invention relates to tertiary frequency modulation whose action sequence is later than that of the primary frequency modulation and the secondary frequency modulation to realize astatic frequency regulation.

Abstract: An integrated circuit includes a first device, and a laterally adjacent second device. The first device includes a first body of semiconductor material extending laterally from a first source or drain region, a first gate structure on the first body, and a first contact extending vertically upward from the first source or drain region. The second device includes a second body of semiconductor material extending laterally from a second source or drain region, a second gate structure on the second body, and a second contact extending vertically upward from the second source or drain region. A gate cut structure including dielectric material is laterally between the first gate structure and the second gate structure, and also laterally between the first contact and the second contact. In some examples, a third contact extends laterally from the first contact to the second contact and passes over the gate cut structure.

Abstract: An electrical impedance imaging sensing system includes a signal processing device, a sensing element and a processor. The signal processing device is electrically coupled to the sensing element and configured for outputting an emission signal. Each of N electrodes of the sensing element is configured to receive a received signal after the emission signal passes through a to-be tested object. The processor is configured to determine whether one of the N electrodes fails according to a plurality of the received signal; in response to the failure of the electrode, compensate the received signal of the failed electrode; and generate an electrical impedance image pre-processing data according to the received signal.

Abstract: The invention is directed to novel variant endoglucanases and their use thereof.

Abstract: A wireless power transfer apparatus includes a first control system, a first energy transmission system, and a second energy transmission system. The first control system is coupled to the first energy transmission system, and inputs an energy transmission signal to the first energy transmission system. The first energy transmission system is coupled to the second energy transmission system, and inputs some of the energy transmission signals obtained from the first control system into the second energy transmission system. Both the energy transmission signal obtained by the first energy transmission signal from the first control system and an energy transmission signal obtained by the second energy transmission system from the first energy transmission system supply power to a target device.

Abstract: A bicycle chain cover includes a rear casing, an outer cover connected with the rear casing, and an inner cover connected with the rear casing. The inner cover and the outer cover are opposite to each other. The inner cover has two first ribs, two second ribs, a first ring and a second ring. The two first ribs are disposed at an inner edge of the inner cover. The two second ribs are disposed at the inner edge of the inner cover. The first ring is connected to the two first ribs. The second ring is connected to the two second ribs. The second ring is rotatably disposed in the first ring.

Abstract: A composition for improving the solubility of poorly soluble substances is provided. The composition for improving the solubility of poorly soluble substances includes 60-97% by weight of cyclodextrin and/or a derivative thereof, 0.5-4% by weight of at least one water-soluble polymer and 0.4-30% by weight of at least one water-soluble stabilizer, wherein the at least one water-soluble stabilizer includes caffeine, and wherein the poorly soluble substance is a tyrosine kinase inhibitor.

Abstract: The present invention discloses a mesh laundry bag, which comprises a mesh container and an elastic closure unit. The mesh container comprises an opening. The elastic closure unit is disposed on the opening to maintain its closed state. By replacing the traditional closure units like zippers with the elastic closure unit, the mesh laundry bag enables one-handed operation for opening and closing, allowing users to use their other hand to place laundry inside the bag. Moreover, the absence of closure units such as zippers significantly reduces the risk of clothing damage.

Abstract: The present disclosure relates to synthesis of an mRNA delivery agent, in particular to a reaction of a related amino compound with ethylene oxide in the presence of ytterbium triflate.