Abstract: A 5-bromoquinazoline derivative (I), structural formula thereof is as follows: the synthesis method thereof comprises weighing 1.18 g of 5-bromoisatin, 2.5503 g of ammonium formate and 100 ml of absolute methanol in a 250 mL round-bottom flask, heating, stirring and refluxing for 48 h, stopping reaction, rotating to obtain 1.6033 g of filter residue crude product, carrying out column chromatography separation by using dichloromethane and absolute methanol according to a volume ratio of 1:1, and obtaining a target crystal compound I; the application of the 5-bromoquinazoline derivative compound crystal (I), as a catalyst has a good catalytic effect in nitrile silicification reaction of benzaldehyde and auto-polymerization reaction of benzophenone hydrazone, the conversion rates thereof respectively reach 39% and 76%, and the crystal (I) can be used as an anti-cancer reagent which has certain anti-cancer activity of breast cancer, liver cancer and lung cancer.

Abstract: Disclosed is a method for preparing high-strength coral aggregate concrete under low pressure conditions, including the following steps: weighing cement, mineral admixture, coral aggregate, mixing water, water reducer, and defoamer; mixing the cement and the mineral admixture well to obtain a cementing material; putting the coral aggregate, sea water, water reducer, defoamer, and 55-85% of the cementing material into a closed mixing system to stir for 10-15 min under low pressure conditions, and pouring the remaining cementing material into the mixing system to stir for additional 10-15 min to prepare the high-strength coral aggregate concrete. The high-strength coral aggregate concrete obtained has advantages of high mechanical properties, high compactness, excellent impermeability and durability, drawing on local resources in construction engineering on remote islands and reefs, and maximum resource utilization.

Abstract: The present invention relates to a xylitol preparation device integrating evaporation, crystallization and centrifugation, including a xylitol tank, a cleaning liquid tank, a recycling tank and a multiple distribution system, wherein the multiple distribution system includes J groups of evaporators for evaporation concentration, K groups of vacuum crystallization kettles for vacuum crystallization and L groups of centrifuges for centrifugation, wherein 2?J?6, 6?K?12 and 2?L?4; the evaporator, the vacuum crystallization kettle and the centrifuge in different groups are sequentially connected in series with one another through a pipeline and a valve respectively; by controlling on and off of each valve, a xylitol exchange liquid is switched and controlled between a series-connection mode and a parallel-connection mode in the multiple distribution system to enable evaporation, crystallization and separation processes to reach an optimal effect distribution so as to improve productivity.

Abstract: A method for manufacturing an air curtain device includes steps of: a) providing a frame that includes two side wall bodies and two end wall bodies cooperatively defining an inner space thereamong, and an upper opening and a lower opening through which the inner space communicates with the external environment; b) covering an upper surface and a lateral outer surface of the frame with a first covering layer; c) closing the lower opening by placing an air-permeable plate; d) sealing a gap between the air-permeable plate and the frame by a first adhesive; e) removing a portion of the first covering layer that covers the upper surface of the frame; and f) closing the upper opening by a cover that is sealingly connected to the frame.

Abstract: The following teachings are of a portable autonomous device and method operating independently of aircraft flight control equipment. The device can be easily moved from one aircraft to another. The device measures the acceleration of the aircraft from the instantaneous speed and the runway distance covered from the start of the acceleration. Once the runway length and take-off speed is input, the device calculates the remaining distance to safely reach the take-off speed. If the remaining runway distance is not enough for the safe take-off, the device provides visual or audible information about the situation and signals to the pilot. In other embodiments, the determination and presentation of the remaining runway length may be implemented in the aircraft flight control equipment.

Abstract: The present disclosure providing a geological sampling backpack drilling machine includes a housing, a drilling device movably received in the housing, a seat arranged on the housing, and a bracket detachably connected to the housing via a limiting rotator, with an angle between the bracket and the housing being variable; the seat arranged between a tip of a drilling rod and the bracket, and rotating around the drilling rod as an axis thereof; a rotating member arranged on a surface of the seat and surrounding around the drilling rod to detachably connect with a supporting post, both the supporting post and the bracket cooperatively supporting the drilling device; the drilling rod passing through the housing and the seat; both the bracket and the supporting post supporting the drilling device that is obliquely drilled and the housing for enabling the drilling device to stably drill at an inclined state.

Abstract: Boron-based amorphous alloys and a preparation method thereof is provided. The composition formula of the alloys is BaCobREcX1dX2eX3f, wherein RE is any one or more of La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Y; X1 is any one or more of C, Si and Al; X2 is any one or two of Fe and Ni; X3 is any one or more of Zr, Nb, Mo, Hf, Ta and W; and a, b, c, d, e and f respectively represent atomic percent of each corresponding element in the formula, where: 45?a?55, 25?b?40, 10?c?20, 0?d?10, 45?a+d?55, 0?e?20, 25?b+e?40, 0?f?3, 10?c+f?20 and a+b+c+d+e+f=100. The preparation method of the boron-based amorphous alloy comprises: preparing master alloy ingots using an arc furnace or an induction melting furnace; and then obtaining amorphous ribbons with different thicknesses by a single copper roller melt-spinning equipment.

Abstract: A method for identifying and extracting characterization parameters of recycled concrete sand particles based on deep learning technology is provided. The method integrates image processing method based on deep learning and quickly recognition of recycled concrete sand particles (RCSP), adopts U-Net semantic segmentation model, develops RCSP data set by inventing a 3D image acquisition platform equipment of recycled concrete sand, in which two CCD industrial cameras are used to collect original multi-dimensional images of the moving RCSP synchronously in the same frame. Secondly, data sets are separated into training set and verification set by 4:1, in which training set are first used to train the U-Net semantic segmentation model to quickly identify the recycled concrete sand, during this process the best training parameters of U-Net semantic segmentation model are determined. Finally, the verification sets are adopted to validate the training model.

Abstract: An antenna comprises a substantially circular ground plane with an upper surface and a defined center. A plurality of radiating elements are placed radially on the upper surface, arranged at constant angles around the defined center to, when electrically excited, create a plurality of circularly polarized electromagnetic emissions. Each radiating element of the plurality of radiating elements is in electrical communication with an electromagnetic source via an electrically conductive feed, the electromagnetic source configured, when in use, to create a radial excitation current on the radiating element, and further configured, when in use, to provide phase and amplitude control of the excited current on the radiating element for both beam forming and 360 degree beam steering by superposing omnidirectional circularly polarized electromagnetic emissions.

Abstract: This disclosure relates to a quantum processor comprising multiple patches of digital qubits and a quantum bus of digital qubits. The quantum bus is configured to connect the multiple patches of digital qubits and to transmit quantum information constituting long-range interactions between the patches of digital qubits. The quantum processor is controlled by a first method of error correction on each of the patches connected by the bus to reduce a relatively high error rate in the digital qubits to a relatively low error rate of each patch, and by a second method of error correction on the multiple patches to correct the relatively low error rate. The number of patches can be increased to increase the distance of the second method and therefore reduce the final error rate. Due to the quantum bus, the patches can be arranged such that there is sufficient space between them for control circuitry.

Abstract: An antenna comprises a substantially circular ground plane with an upper surface and a defined center. A plurality of radiating elements are placed radially on the upper surface, arranged at constant angles around the defined center to, when electrically excited, create a plurality of circularly polarized electromagnetic emissions. Each radiating element of the plurality of radiating elements is in electrical communication with an electromagnetic source via an electrically conductive feed, the electromagnetic source configured, when in use, to create a radial excitation current on the radiating element, and further configured, when in use, to provide phase and amplitude control of the excited current on the radiating element for both beam forming and 360 degree beam steering by superposing omnidirectional circularly polarized electromagnetic emissions.

Abstract: An enhanced TL-TCAM lookup-table hardware search engine includes a plurality of enhanced TL-TCAM cell circuits. There are m enhanced TL-TCAM cells circuits connected in parallel to form a sub-segment circuit. The word line WL, match line ML and ML_x of each enhanced TL-TCAM cell circuit in the sub-segment circuit are respectively short-connected together, the match line ML is connected to the drain electrode of an N-type transistor N15, ML_x is connected to the gate electrode of the N-type transistor N15, and the source electrode of the N-type transistor N15 is connected to ground, ML_x is connected to the drain electrode of an N-type transistor N14, the source electrode of the N-type transistor N14 is connected to ground, and the gate electrode of the N-type transistor N14 is connected to the signal line OneX_in-Sement_b, a plurality of sub-segment circuits are connected in parallel to form a word circuit.

Abstract: Provided are an ultrasonic human body communication method and a device thereof, the method including dividing serial information into blocks, and each information block includes modulation bits and index bits; each transmission frame is divided into multiple groups; performing an index modulation on the groups of each transmission frame, determining activated group sequence numbers; performing a digital modulation on the modulation bits of each information block, and mapping the digitally modulated modulation bits to activated groups; for the multiple information blocks processed in parallel, performing a parallel/serial conversion, a pulse shaping, and an ultrasonic conversion in sequence to obtain a transmission signal, and transmitting the transmission signal in a human body through a transmission frame; on a receiving node, receiving a received transmission signal propagated by the human body, and demodulating the received transmission signal to obtain the index bits and the modulation bits.

Abstract: A salty taste enhancing peptide derived from dry-cured ham is provided, and the amino acid sequences thereof are Asp-Leu; Phe-Met-Ser-Ala-Leu-Phe, as shown in SEQ ID NO: 1; and His-Val-Arg-Arg-Lys, as shown in SEQ ID NO: 2. The salty taste enhancing peptide in the present disclosure is of small molecular weight, features easy separation and purification, has strong salty taste enhancing effect and simple sequences, and is easy to synthesize, therefore, the salty taste enhancing peptide can be applied to the fields of food, health products, medicine and biology, and is expected to replace salt substitute products currently available on the market.

Abstract: A device and method for testing the bearing capacity of grouped pillars in the inclined goaf under coupled biaxial static and disturbance stresses are provided. Four protection rings are arranged on a base, each protection ring is installed with one machine frame therein, a bottom end of the machine frame is connected with the base and a top end thereof is connected with a transverse frame. Sliding rails are arranged on two sides of the base, side frames are installed on the sliding rails. A vertical force loading device is arranged at a bottom of a workbench, transverse force loading devices are arranged on inner sides of the side frames respectively. A force disturbance device is arranged at the bottom of the transverse frame. An upper slidable clamping seat and an upper pressure disk are arranged above the samples, and a lower slidable clamping seat is arranged below the samples.

Abstract: A transverse vibration rolling system and a preparation method for a double-layer metal composite ultra-thin strip relate to a technical field of rolling, which solve problems including poor rolling and bonding effects, low geometric accuracy, and poor plate shape quality of metal composite ultra-thin strips. The transverse vibration rolling system includes: a first roll, a second roll, a first hydraulic vibrator, a second hydraulic vibrator, a first hydraulic motor, a second hydraulic motor, a check valve, a first hydraulic pump, a first overflow valve, an oil tank, a controller, a second overflow valve, a second hydraulic pump, an electromagnetic reversing valve, a first speed control valve, and a second speed control valve. The transverse vibration of the rolls of the present invention can apply transverse shearing force on the ultra-thin metal strips during the bond rolling.

Abstract: The present disclosure belongs to the field of dual-fuel engine combustion systems, in particular to a dual-fuel intelligent combustion system and a control method thereof. The dual-fuel intelligent combustion system comprises a cylinder body, a cylinder cover, a piston, a methanol fuel injector, a diesel injector and ECUs (electronic control units), wherein the cylinder body, the cylinder cover and the piston form a combustion chamber, the cylinder cover is arranged right above the cylinder body, the piston is arranged in the cylinder body, the combustion chamber is provided with an air inlet channel and an air outlet channel, the combustion chamber is internally provided with the methanol fuel injector for injecting alcohol fuel into a cylinder and the diesel injector for injecting ignition fuel diesel into the cylinder, and the methanol fuel injector and the diesel injector are respectively controlled by the two ECUs.

Abstract: The present disclosure relates to a method for preparing an unbleached biomechanical pulp and fully utilizing by-products by treating wheat straws with heat steam in synergy with biological enzymes, which belongs to the technical field of papermaking technology and waste comprehensive utilization. The present disclosure provides a method for preparing an unbleached biomechanical pulp by treating whole wheat straws with heat steam in synergy with biological enzymes, where the prepared high-strength biomechanical pulp can meet the requirements of producing unbleached packaging paper and paper-based materials. At the same time, the by-products are recycled to prepare a biomass compound fertilizer, which turns solid waste into treasure and realizes the high-value full utilization of wheat straw. Therefore, the method in the present disclosure is simple, green, clean and efficient, which has good practical application value and broad application prospects.

Abstract: A hybrid feeding device for automatically adjusting a co-firing amount of decaying garbage. The device comprises a mechanical grate furnace, a hybrid garbage conveying device, a raw garbage feeding device, a decaying garbage feeding device, a hybrid garbage crushing device, and a control center. The raw garbage feeding device, the decaying garbage feeding device, and the hybrid garbage conveying device are all connected to the control center. The decaying garbage feeding device is used for transporting decaying garbage to the raw garbage feeding device. The raw garbage feeding device is positioned between the decaying garbage feeding device and the hybrid garbage conveying device. The hybrid garbage crushing device is used for crushing garbage and inputting the garbage to the mechanical grate furnace. The mechanical grate furnace is internally provided with a plurality of temperature sensors, and the plurality of temperature sensors are connected to the control center.

Abstract: The present invention discloses a method of preparing an alkali activation material by using red mud-based wet grinding and carbon sequestration and an application thereof. The preparation method includes: (1) adding water, red mud, a crystalline control agent, and a grinding aid into a wet grinding carbon sequestration apparatus to perform wet grinding, and simultaneously introducing CO2 until a slurry pH reaches 7 to 7.5; and removing wet grinding balls by a sieve to obtain a slurry A; (2) adding carbide slag, water and a water reducer to a wet planetary ball grinder tank for wet grinding, and removing wet grinding balls by a sieve to obtain a slurry B; (3) taking 50 to 80 parts of the slurry A and 20 to 50 parts of the slurry B and mixing them to obtain an alkali activation material.