Abstract: The present invention relates to a formaldehyde-free medium-high-density board capable of meeting deep facing requirements, and a method for manufacturing same. The method includes: wood chipping, screening, cooking and softening, fiber separating, gluing, drying and sorting, paving, pre-pressing, hot pressing, cooling, sanding, and inspection and warehousing, where the gluing is two-step gluing, including: first performing gluing once by using a lignin adhesive, and then performing secondary gluing by using an MDI adhesive after waterproof treatment. According to the manufacturing method of the present invention, by using biomass adhesives and formaldehyde-free adhesives without adding additives such as a curing agent and an anti-mildew agent, formaldehyde pollution is eliminated from the source by using a two-step gluing method, so that production is formaldehyde-free, and the product is formaldehyde-free.

Abstract: The invention relates to a self-adaptive positive-sequence current quick-break protection method for a petal-shaped power distribution network trunk line. The method comprises the following steps: step 1, calculating a positive-sequence voltage phasor and a positive-sequence current amplitude at a protection installation position when a fault occurs, acquiring and storing a positive sequence impedance value of a protected line; judging a fault type, and judging a fault direction; step 2, when a fault direction element judges that a fault occurs in the forward direction, selecting a self-adaptive current quick-break protection setting formula according to the fault type, and when positive sequence current measured by protection is larger than a protection setting value, judging that the protected line has a short-circuit fault, and making a circuit breaker trip quickly.

Abstract: The invention discloses an islanding detection method in DC microgrids based on MPPT trapezoidal voltage disturbance. The steps are as follows: start the MPPT strategy; set the starting signal threshold of disturbance; measure the output current of PVA at the maximum power; calculate the same environmental factor of PVA with different capacities under the same light intensity and temperature in real time; when the environmental factor is greater than the starting signal threshold of the disturbance, periodic trapezoidal disturbance is carried out to the PVA port voltage reference; if the PCC voltage Upcc exceeds the threshold set by the passive method, it is judged as islanding; otherwise, it is judged whether the change rule of Upcc is consistent with the change rule of the calculated PCC voltage Upccp under the trapezoidal disturbance; If it is consistent, it is judged as islanding; otherwise, it is pseudo islanding.

Abstract: OLED pixel driving circuit, array substrate and display device are provided. The pixel driving circuit comprises a driving control unit, a first light emitting unit and a second light emitting unit. Two OLEDs share one driving control unit, so the two OLEDs alternately emit light. In this way, light emitting time of the OLEDs is reduced, number of parasitic capacitors and data lines in a panel is reduced, and aperture ratio of the OLED device is increased; and OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that OLEDs do not have to be in a DC bias state for a long time, and thus, aging of the OLED device is slowed down. No other reverse bias voltage is connected externally, difficulty of tracing of the pixel circuit and crosstalk from a bias voltage line to other signal lines are reduced.

Abstract: The present disclosure relates to the technical field of microwave test, and discloses a method and a system for analyzing the spatial resolution of a microwave near-field probe and a microwave microscope equipped with the system, wherein in the method for analyzing the spatial resolution of the microwave near-field probe, a three-dimensional equipotential surface in a sample is drawn by using an electric field formula calculated by a quasi-static theory; an equivalent model of a probe sample is established by using finite element analysis software, so as to change material characteristics in the area outside the three-dimensional equipotential surface; by observing the influence of changing materials on the potential distribution in the sample, a near-field action range of the probe is determined, and the spatial resolution of the microwave near-field scanning microscope is analyzed and calculated.

Abstract: The present disclosure relates to an all-trans retinoic acid liposome formulation and a preparation method thereof. The all-trans retinoic acid liposome formulation includes all-trans retinoic acid and a liposome vector. The disclosure adopts an active drug loading method, including a calcium acetate gradient method or a sodium acetate gradient method. The prepared all-trans retinoic acid formulation has high drug loading and high stability in vivo, thereby increasing the blood concentration and prolonging the half-life of the all-trans retinoic acid.

Abstract: A method for adjusting lens position, includes: controlling a lens in a photographing component to be sequentially located at m first lens positions during a focusing process, and acquiring a first definition of an image captured by the photographing component at each of the first lens positions, where m?3; selecting a first relationship curve in a focusing curve library according to a matching condition, the focusing curve library including at least two relationship curves between definitions and lens positions captured at different focusing distances, and the matching condition being used to indicate a degree of similarity between the m first lens positions as well as the first definitions and the relationship curves; and controlling the lens to be located at a target lens position corresponding to a maximum definition indicated by the first relationship curve.

Abstract: The present disclosure provides an all-trans retinoic acid injectable formulation and its application for a preparation of a pharmaceutical product for treating tumor. The all-trans retinoic acid injectable formulation includes all-trans retinoic acid and solubilizers. The apparent solubility of the all-trans retinoic acid is increased from 0.01 mg/mL to 0.1 mg/mL or more. The injectable formulation can reduce the activity of an infiltrated immuno-suppressive cell population within blood or tumor tissue of a cancer patient, and improve immune clearing effects against tumors. It can be applied independently or together with other pharmaceutical products to inhibit tumor growth and prevent tumor recurrence.

Abstract: The present invention relates to a floating hydrophyte planting device, comprising a height-adjustable support, a buoyant rope, a planting net rope, a stabilizing rope and hydrophytes. The height-adjustable support comprises a fixed part and a movable part. The fixed part comprises columns and inclined stayed and fixed steel wires. A sawtooth groove is arranged on one side face of the column in the height direction and has multiple notches at different heights. The movable part comprises a twisting pull rod. The twisting pull rod is provided with a cross locking column vertical to the body of the twisting pull rod. The locking column is limited in the notch. After the twisting pull rod is twisted, the cross locking column may separate from the notch; after the twisting pull rod moves in the vertical direction and is twisted again, the cross locking column is limited in another notch.

Abstract: A pixel driving circuit includes a driving transistor, a first switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor, an initial-voltage-signal terminal, a data-voltage-signal terminal, and a driving-voltage-signal terminal. The driving transistor includes a gate terminal, a source terminal, and a drain terminal. The first switch is disposed between the gate terminal and the drain terminal. The gate terminal is connected with the initial-voltage-signal terminal via the second switch. The source terminal is connected with the driving-voltage-signal terminal and the data-voltage-signal terminal via the third switch and the fourth switch, respectively. The first capacitor is connected between the gate terminal and a ground terminal. The second capacitor is connected between the gate terminal and the source terminal. A pixel driving method and a display panel are also provided.

Abstract: A focusing method includes acquiring a current frame image through a camera; performing through an image stabilization algorithm a uttering compensation on the current frame image acquired by the camera to form a compensated image, wherein the image stabilization algorithm is used to perform electronic anti-jittering processing; performing through a statistic value algorithm a statistic value operation on the compensated image, to obtain statistic value information of the compensated image; determining focusing data to be used to move the camera to a focus position, according to the statistic value information; and adjusting a position of the camera according to the focusing data, to achieve focusing.

Abstract: A pixel driving circuit includes a driving transistor, a first switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor, an initial-voltage-signal terminal, a data-voltage-signal terminal, and a driving-voltage-signal terminal. The driving transistor includes a gate terminal, a source terminal, and a drain terminal. The first switch is disposed between the gate terminal and the drain terminal. The gate terminal is connected with the initial-voltage-signal terminal via the second switch. The source terminal is connected with the driving-voltage-signal terminal and the data-voltage-signal terminal via the third switch and the fourth switch, respectively. The first capacitor is connected between the gate terminal and a ground terminal. The second capacitor is connected between the gate terminal and the source terminal. A pixel driving method and a display panel are also provided.

Abstract: OLED pixel driving circuit, array substrate and display device are provided. The pixel driving circuit comprises a driving control unit, a first light emitting unit and a second light emitting unit. Two OLEDs share one driving control unit, so the two OLEDs alternately emit light. In this way, light emitting time of the OLEDs is reduced, number of parasitic capacitors and data lines in a panel is reduced, and aperture ratio of the OLED device is increased; and OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that OLEDs do not have to be in a DC bias state for a long time, and thus, aging of the OLED device is slowed down. No other reverse bias voltage is connected externally, difficulty of tracing of the pixel circuit and crosstalk from a bias voltage line to other signal lines are reduced.

Abstract: A pixel driving circuit includes a driving transistor, a first switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor, an initial-voltage-signal terminal, a data-voltage-signal terminal, and a driving-voltage-signal terminal. The driving transistor includes a gate terminal, a source terminal, and a drain terminal. The first switch is disposed between the gate terminal and the drain terminal. The gate terminal is connected with the initial-voltage-signal terminal via the second switch. The source terminal is connected with the driving-voltage-signal terminal and the data-voltage-signal terminal via the third switch and the fourth switch, respectively. The first capacitor is connected between the gate terminal and a ground terminal. The second capacitor is connected between the gate terminal and the source terminal. A pixel driving method and a display panel are also provided.

Abstract: A hazard point marking method and a hazard point marking system are provided. The method includes: acquiring, by Augmented Reality (AR) glasses, position information of a hazard point in response to a triggering operation of an inspector, where the position information of the hazard point is used for characterizing a position of the hazard point in a tunnel model; sending, by the AR glasses, the position information of the hazard point to a server; and marking, by the server, the hazard point in the tunnel model based on the position information of the hazard point.

Abstract: The present disclosure provides an OLED pixel driving circuit and an OLED display apparatus utilizing the circuit scheme of 3T1C. The normal displaying mode and detecting mode of the pixel driving circuit both include two phases by controlling the conductions of different transistors. And, the pixel driving circuit is capable of implementing corresponding data compensation under the displaying mode according to the detected voltage threshold Vth of the driving TFT and the intrinsic conductivity factor value k of the aged OLED. This is capable of improving the uniformity of display and the illuminating efficiency.

Abstract: The present invention provides a driving compensation circuit for an organic light-emitting diode (OLED) display unit. The OLED display unit includes: N first switching transistors, N second switching transistors, N sensing units, and a calculation and processing unit. The calculation and processing unit is configured to calculate a mapping relationship between a data voltage of the data line and current information, and to calculate a data compensation voltage in a display phase according to second current information and the mapping relationship.

Abstract: The present disclosure provides an OLED pixel driving circuit and an OLED display apparatus utilizing the circuit scheme of 3T1C. The normal displaying mode and detecting mode of the pixel driving circuit both include two phases by controlling the conductions of different transistors. And, the pixel driving circuit is capable of implementing corresponding data compensation under the displaying mode according to the detected voltage threshold Vth of the driving TFT and the intrinsic conductivity factor value k of the aged OLED. This is capable of improving the uniformity of display and the illuminating efficiency.

Abstract: The present disclosure provides a pixel including a first transistor, a second transistor, a third transistor, a fourth transistor, a capacitor, and an OLED; the second transistor and the third transistor are turned on in the first period to charge the capacitor with a data current, until the current flowing through the second transistor is 0 and the current flowing through the first transistor is the data current, the capacitor stores a voltage corresponding to the data current; the fourth transistor is turned on in the second period to cause the OLED to emit light, and the voltage stored by the capacitor corresponding to the data current causes the current flowing through the OLED to coincide with the current flowing through the first transistor in the first period. The present disclosure can make the current flowing through the OLED not change with the threshold voltage of the driving transistor.

Abstract: The present invention provides a driving circuit of an organic light emitting diode display device, including: a reference driving circuit for driving an organic light emitting diode to emit light; a compensation circuit for performing voltage compensation on the reference driving circuit; and a data voltage providing circuit for providing a data voltage to the reference driving circuit, wherein the data voltage providing circuit and the compensation circuit are connected to an input end of the reference driving circuit together.