Abstract: The present invention provides a method of preparing a recycled cementitious material by a phosphogypsum-assisted carbon sequestration pretreatment process. The method includes: (1) placing 100 mass parts of phosphogypsum, 1 to 2 mass parts of grinding aid, 10 to 20 mass parts of sodium-containing alkali component, 150 to 300 mass parts of zirconia balls, and 150 to 300 mass parts of water into a wet grinding tank for wet grinding. After 10 min to 30 min of wet grinding, introducing CO2 at a flow rate of 1.5 to 2.2 mass parts/min to keep a temperature of a wet grinding slurry below 40° C. When the wet grinding slurry reaches pH=10, ending the wet grinding and sieving out a wet grinding slurry; (2) mixing the wet grinding slurry with 700 to 1000 mass parts of slag and 100 to 350 mass parts of water to obtain a recycled cementitious material.

Abstract: The present disclosure provides a method for determining a stability criterion for a control loop of a grid-connected converter under a weak grid condition, and belongs to the field of power control. The method includes performing a sampling, obtaining an expression of a transfer function of each of control loops of a grid-connected converter, further obtaining an expression of a transfer function for indicating stability performance of the system, obtaining an amplitude expression and a phase expression according to the transfer function, and providing a stability criterion for the control loop of the grid-connected converter under a weak grid condition and a stability margin expression of the system. The stability criterion for the control loop is significant and provided by a simple method, can quickly and accurately determine the stability of the grid-connected converter system under the weak grid condition, and is helpful for the parameters design of the controllers.

Abstract: A high-temperature three-dimensional Hall sensor with a real-time working temperature monitoring function includes a buffer layer, an epitaxial layer, and a barrier layer sequentially grown on a substrate. A high-density two-dimensional electron gas is induced by polarization charges in a potential well at an interface of heterojunctions of the epitaxial layer. A lower surface of the substrate includes a vertical Hall sensor for sensing a magnetic field parallel to a surface of a device. An upper surface of the barrier layer includes a “cross” horizontal Hall sensor for sensing a magnetic field perpendicular to the surface of the device.

Abstract: The present invention relates to a hybrid dynamically installed anchor with a folding shank and a control method to keep the verticality of the hybrid anchor during free fall in the seawater, which can be applied to the field of offshore engineering. The hybrid anchor comprises a folding-shank plate anchor, a ballast shaft, an extension rod, a plurality of rear fins, and a recovery hole from the front to the tail. The folding shank is not only useful in reducing the water and soil resistance during installation, but also beneficial in improving the directional stability of the hybrid anchor during free fall in the seawater. The re-used shaft can significantly increase the penetration depth of the folding-shank plate anchor and reduce the installation cost at the same time. The control method keeping the verticality of the hybrid anchor can improve the success rate during anchor installation.

Abstract: Disclosed is a suturing training device and a method of using the device. The device comprises a base having a first side and a second side, the base defining a plane. The device also comprises a first anchor and a second anchor positioned on the first side of the base. The first and second anchors are each connectable to a segment of tissue so that the tissue is suspended therebetween in use of the device. An actuator is associated with one or both of the first anchor and the second anchor. The actuator is actuatable to cause relative movement of the first and second anchors along the plane. A force gauge is configured to measure a force applied to the tissue when the first and second anchors are moved relative one another by the actuator.

Abstract: The present disclosure discloses a digital hydraulic assisted braking system with a high dynamic response and a control method thereof. The system includes a two-position two-way digital switch valve A, a controller, an electromagnetic two-position two-way proportional reversing valve, a two-position two-way digital switch valve B, a displacement detection system, and a pressure detection system. When a vehicle starts, a control system of the present disclosure maintains a preload state and responds to a braking at any time. During an emergency braking, the braking system is open. When the vehicle is shut down, the braking system is closed. Compared with an existing braking method, by implementing the braking method of the present disclosure, a braking response time is greatly shortened, a dynamic performance of a braking response period is improved, and a safety of vehicle braking is further guaranteed.

Abstract: The present invention proposes a bi-level optimization-based infrared and visible light fusion method, adopts a pair of infrared camera and visible light camera to acquire images, and relates to the construction of a bi-level paradigm infrared and visible light image fusion algorithm, which is an infrared and visible light fusion algorithm using mathematical modeling. Binocular cameras and NVIDIA TX2 are used to construct a high-performance computing platform and to construct a high-performance solving algorithm to obtain a high-quality infrared and visible light fusion image. The system is easy to construct, and the input data can be acquired by using stereo binocular infrared and visible light cameras respectively; the program is simple and easy to implement; and the fusion image is divided into an image domain and a gradient domain for fusion by means of mathematical modeling according to different imaging principles of infrared and visible light cameras.

Abstract: The present application discloses a QoE-based adaptive acquisition and transmission method for VR video, comprising the following steps: 1, capturing, by respective cameras in a VR video acquisition system, original videos with the same bit rate level, and compressing each original video with different bit rate levels; 2, selecting, by a server, a bit rate level for each original video for transmission, and synthesizing all of the transmitted original videos into a complete VR video; 3, performing, by the server, a segmentation process on the synthesized VR video, and compressing each video block into different quality levels; and 4, selecting, by the server, a quality level and an MCS scheme for each video block according to real-time viewing angle information of users and downlink channel bandwidth information in a feedback channel, and transmitting each video block to a client.

Abstract: A rigid-flexible coupling-driven robot for removing oxide scales on super large shaft forgings online includes a heavy-duty manipulator main body, four walking systems, a movable arm lifting system, a clamping system, a power system, two oxide scale removal systems and a visual identification system. The two oxide scale removal systems are respectively installed on the two trapezoidal plates of the clamping system. Each of the two oxide scale removal systems adopts rigid-flexible coupling drive technology, that is, the rigid drive of the overhead hydraulic cylinder, cable-stayed hydraulic cylinder, the long stroke scissor retractable bracket and the rack and pinion device is combined with the flexible drive of the wire rope, so that the retraction and the angle tilt of the parallelogram end removal device are realized, which makes the oxide scale removal more flexible and efficient, thus greatly improving the product quality of large forgings.

Abstract: The present disclosure discloses a terahertz detector based on a Schottky contact grating structure. THz response frequency points are adjusted by adjusting parameters (a grating width, a grating length, a grating region area, a grating period, and a grating pattern form) of the Schottky contact grating structure (in the detector design stage, the grating structure parameters can be adjusted according to the actually required detection frequency points (single frequency point or multiple frequency points)), thereby realizing single-frequency detection or realizing that one detector supports the detection of multiple frequency points. The grating is introduced into the Schottky Barrier Diode, so that the grated Schottky contact resonates with the terahertz waves, the plasma resonance effect is enhanced, and the detection sensitivity is further improved.

Abstract: A wireless power transmission system includes a structure entirely surrounded by an electromagnetic wave shielding member having appropriate electrical conductivity and appropriate frequency selectivity; at least one power receiving unit; at least one power transmission unit; and at least one resonance frequency adjuster. The resonance frequency adjuster includes at least one conductive protrusion having an open end and a transmission line connected to another end of the conductive protrusion at one end of the transmission line, wherein the open end of the conductive protrusion is arranged inside the structure, and the transmission line is electrically connected to the electromagnetic wave shielding member defining a wall surface of the structure at another end not connected to the conductive protrusion.

Abstract: A preparation method of a double-T-shaped gate based on double-layer passivation accurate etching includes: sequentially growing two passivation layers on an epitaxial structure, where the two passivation layers include a bottom passivation layer and a top passivation layer; performing a first exposure on the top passivation layer and etching the top passivation layer and the bottom passivation layer in a first exposure region from top to bottom to form a gate root region; performing a second exposure on the top passivation layer and etching the top passivation layer in a second exposure region to form a lower gate cap region; and performing a third exposure on the top passivation layer to form a top gate cap exposure region and performing metal evaporation and removing a photoresist to form a double-T-shaped gate structure in the two passivation layers.

Abstract: Disclosed is a transparent conductive oxide thin film. The metal oxide is a transparent conductive material of (In2O3)x(MO)y(ReO)z formed by doping a small amount of a rare earth oxide ReO into an indium-containing metal oxide MO—In2O3 as a photon-generated carrier conversion center. According to the present application, in an indium-based metal oxide, a rare earth oxide material is introduced, such that the carrier concentration is controlled, and the mobility is improved; rare earth ions in the rare earth oxide have the lower electronegativity, and an ionic bond Ln-O formed by the rare earth ions and oxygen ions has the higher bond breaking energy, such that the oxygen vacancy concentration in the In2O3 thin film may be effectively controlled. The rare earth ions have the ionic radius equivalent to that of indium ions, defect scattering caused by structure mismatch may be reduced, the high mobility characteristics thereof may be kept better.

Abstract: An intelligent switching system for switching internal cooling and external cooling and a method are provided. The system includes a vision system, a cooling system and a control system. The vision system monitors a real-time milling state of a cutter, collects a real-time milling depth image that the cutter mills a workpiece, and transmits the collected real-time milling depth image to the control system. The control system includes a lubrication mode control center, and a motor control center. The lubrication mode control center receives the real-time image transmitted by the image collection control center; analyzes and processes the real-time image to obtain real-time milling depth data of the cutter. The motor control center receives a signal sent by the lubrication mode control center; analyzes and processes the signal, and transmits a control instruction to the cooling system. The cooling system executes a switching command issued by the control system.

Abstract: The present invention discloses a gas hydrate-based particulate/waste gas simultaneous removal system and method. R134a can be used to synthesize particulates/coking waste gases into gas hydrate, which can realize the simultaneous removal of particulates/coking waste gases with no pollution and low energy consumption. The system comprises a waste heat recovery device, a gas hydrate primary dust removal tower, a solid-liquid separation primary tower, a gas hydrate secondary dust removal tower, a solid-liquid separation secondary tower, a gas hydrate decomposition pool, a gas-solid separation tower and a low temperature fractionation device. The present invention can achieve the removal of harmful substances such as heavy metals and coking waste gases while removing particulates.

Abstract: An alkali- and/or alkaline earth-ion sulfur battery having at least one cathode containing a cathode current collector foil, optionally a conductive adhesive interlayer, a primary cathode mass layer containing a conductive dimensionally stable porous host structure, sulfur as an active material, preferably at least 20% of the sulfur present is monoclinic sulfur allotrope, and optionally conductive additives, binders and pore-forming additives; a secondary cathode mass layer containing sulfur and alkali-ion- and/or alkaline earth-ion-intercalating material, optionally a layer containing graphene oxide and/or reduced graphene oxide, heteroatom Group VIIa and/or Group Va elements co-doped graphene, and a Group VIIa and/or Group Va heteroatom-containing polymer; at least one anode and at least one separator. The resulting cells offer a wide range of economic and ecological advantages over the currently available cells, as well as allowing versatility of materials and production processes.

Abstract: A cam roller type horizontal extrusion cracking system for walnuts, including feeding, cracking and falling devices fixed accordingly on a stand. The feeding device includes a feeding box; an intermittent feeding roller is arranged therein; one side of the roller includes a feeding baffle plate, the other side includes an adjustable feeding scraper blade mechanism; and opposing feeding slots are formed in the roller. The cracking device includes an extrusion box body; movable and fixed tooth-shaped extrusion plates are oppositely mounted therein; one side of the movable plate opposite the fixed includes an extrusion cam; the plates have a plurality of tooth gaps; a walnut passes through the feeding device, falls into a gap between the plates; the cam drives the movable plate to do a periodic reciprocating motion, to synchronously cooperate with the fixed plate to perform extrusion cracking on the walnut.

Abstract: This disclosure discloses a single-inductor multiple-output DC-DC buck converter, which includes a power conversion unit and i charge controllers, as well as a phase-locked loop, a logic unit, a driving unit, and an input trunk duty ratio generation unit. The charge controllers are connected to the driving unit through the logic unit. The logic unit is further connected to the phase-locked loop and the phase-locked loop is connected to the driving unit through the input trunk duty ratio generation unit. The driving unit is connected to the power conversion unit. The disclosure applies charge control to every output branch path, and adopts a phase-locked loop as the cycle control, which effectively suppresses the cross modulation effect of every branch path, and does not require the last branch path to have a sufficiently heavy load, which broadens the load range, while taking into account other performance requirements concurrently.

Abstract: The present invention discloses a system for large scale additive manufacturing, an apparatus for large scale additive manufacturing, and a bio-composite material used for the large scale additive manufacturing. The apparatus and the bio-composite material enable the system to operate in a desired manner. The system is able to facilitate “on demand” manufacturing, is able to provide regional/localised modifications for consumers, is able to minimise transportation/storage costs and also minimises damage to the environment.

Abstract: An energy-saving system using electric heat pump to recover flue gas waste heat for district heating uses flue gas waste heat recovery tower to absorb the sensible and latent heat in the high-temperature flue gas by direct contact heat and mass transfer. The circulating water is sprayed from the top and the flue gas flows upwards in the tower. The electric heat pump is indirectly connected with circulating water through the anti-corrosion and high-efficiency water-water plate heat exchanger. The return water of the heat-supply network enters the electric heat pump through the anti-corrosion and high-efficiency water-water plate heat exchanger and exchanges heat indirectly with the high-temperature circulating water. The electric heat pump uses the electric energy of the power plant as the driving power.