Abstract: A method for selection of a calibration set and a validation set based on spectral similarity and modeling. The method includes: performing NIR spectrometry on original samples to obtain a spectral matrix of the original samples; randomly selecting m samples as an independent test set; calculating spectral similarity between each of the samples in the independent test set and each of the remaining samples in the original samples respectively to obtain g samples having the highest similarity to be written into the validation set; and calculating spectral similarity between each of the samples in the validation set and each of the remaining samples in the original samples respectively to obtain n samples having the highest similarity to be written into the calibration set. Based on the validation set and the calibration set selected through the method, an obtained model can predict unknown samples more accurately.

Abstract: Provided is a driving method of a display panel, which relates to a field of a display technology. The display panel includes a pixel array, the pixel array comprises a plurality of rows of sub-pixels, and the driving method includes: driving, in a same display frame, different sub-pixels in a row of the sub-pixels respectively by a forward driving signal and a negative driving signal, wherein a voltage conversion rate of the forward driving signal is greater than a voltage conversion rate of the negative driving signal under a same display gray scale. A driving circuit, a driving chip and a display device are further provided.

Abstract: The present invention provides a diaphragm and a MEMS sensor using the diaphragm. The diaphragm is a rectangular diaphragm, and the diaphragm includes a main body of the diaphragm and fixed parts arranged outside the main body of the diaphragm and located at the four corners of the diaphragm. The four corners of the rectangular diaphragm are depressed parts formed by concave in the direction of the diaphragm main body. The fixed part includes at least two fixed anchor points arranged along the edge of the diaphragm forming the depressed part. The present invention improves the effective sensing area of the diaphragm and the acoustic performance of the MEMS sensor.

Abstract: A novel cationic lipid having a structure as represented by general formula (1), which specifically relates to a nitrogen-containing cationic lipid, and also relates to a liposome containing the cationic lipid, a liposome pharmaceutical composition containing said cationic lipid, preparation and application thereof. A cationic liposome containing the cationic lipid represented by formula (1), can improve the loading rate and transport rate of drugs, particularly nucleic acid drugs. The terminus of the novel cationic lipid can contain a fluorescent group or a targeting group, so that the cationic liposome pharmaceutical composition containing the cationic lipid can have fluorescent or targeting function.

Abstract: Provided in the present disclosure are a display panel and a manufacturing method therefor, and a display apparatus. A pixel defining layer includes a plurality of first barrier walls and a plurality of second barrier walls, which are arranged in an intersecting manner, where a height of the first barrier wall is smaller than a height of the second barrier wall, and orthographic projections of via holes for connecting light emitting devices on a base substrate are located in orthographic projections of the second barrier walls on the base substrate. Due to a great thickness of the second barrier walls, an effect of covering via holes can be better by providing the via holes below the second barrier walls.

Abstract: A system includes a milling assembly with a mill bit and a drill string that mills a new wellbore section. The system further includes a whipstock assembly that is formed by a smart reamer that reams an obstruction in a wellbore, a whipstock that deflects the milling assembly away from the wellbore, and a bypass valve mechanism that controls a fluid flowing through the system. Within the system, the milling assembly is fluidly connected to the whipstock assembly.

Abstract: An electroluminescent device and a display apparatus, for improving the efficiency and prolonging the service life of the electroluminescent device. The electroluminescent device comprises: an anode comprising a reflective material; a cathode arranged opposite to the anode and comprising a transflective material; n light-emitting functional layers laminated between the anode and the cathode, wherein n is an integer greater than 1; and each light-emitting functional layer comprises a light-emitting layer and an electron transport layer located at the side of the light-emitting layer close to the cathode, wherein the thickness of the electron transport layer in the light-emitting functional layer closest to the cathode is greater than that of the electron transport layers in the remaining light-emitting functional layers; and (n?1) charge generation layers located between two adjacent light-emitting functional layers.

Abstract: A time synchronization method, a time synchronization sender, a time synchronization receiver and a time synchronization system are provided. The method includes: determining whether at least one parameter causing recalculation of a best master clock (BMC) algorithm changes; in a case where it is determined that the parameter changes, sending a 1588 standard-based Announce message; and in a case where it is determined that the parameter does not change, sending a keep-alive message of the Announce message. In the present disclosure, by distinguishing keep-alive messages from protocol messages, the problem that a CPU system is busy due to the processing of Announce messages is solved, thereby realizing the optimization of the 1588 protocol, and reducing the impact on the CPU.

Abstract: A mutated Csf1r gene is disclosed. The mutated Csf1r gene is obtained by changing the 2557th nucleotide of a Csf1r gene from C to A, leading to obtain a mutated protein encoded by the mutated Csf1r gene substitute the 853rd amino acid from proline to threonine. The mutated protein, expression vectors, recombinant viruses, recombinant cells, recombinant bacteria, or recombinant vectors are also disclosed. A method for constructing a murine model with mutations in Csf1r gene. This method includes introducing the targeted vector containing the mutated Csf1r gene into mouse embryonic stem cells, followed by injection into blastocysts to generate F0 generation mice. The F0 generation mice are then bred with mice that specifically express Cre enzyme in tissues, followed by screening. The constructed murine model has significant applications in studying the pathogenic mechanisms of brain diseases caused by microglial cell dysfunction and screening valuable medicine for treating brain diseases.

Abstract: A lower completion screen, for operating in a wellbore, includes: a body; a screening surface disposed on the body, wherein the screening surface includes a plurality of holes; a plurality of rollers disposed on the body; and a power system. A first group of the plurality of rollers is disposed on a first end of the body, and a second group of the plurality of rollers is disposed on a second end of the body. The power system is disposed on the second end of the body, and controls movement of the lower completion screen in the wellbore.

Abstract: A novel PEGylated lipid and preparation methods thereof, a cationic liposome containing the lipid, a pharmaceutical composition containing the liposome, a formulation and application thereof. The PEGylated lipid can be used for modifying a liposome, and can be further modified and coupled with a targeting group and then used for modifying a liposome to obtain a liposome having the targeting group. Due to the presence of a long-chain PEG and the targeting group on the lipid, the modified liposome can avoid being removed by the reticuloendothelial system in a human body and realize a targeting function. Therefore, when the modified liposome delivers an active drug to cells or a patient, especially when delivering a nucleic acid or anti-tumor drug, the liposome can realize long circulation in vivo and improve the transport efficiency of drug, and has a targeting function, so the therapeutic effect of a drug is improved.

Abstract: Embodiments of the present disclosure provide a video processing method and apparatus, a device, a storage medium and a computer program product, where the method includes: playing an audio in a process of capturing a video; playing a first part of the audio at a changing speed according to a first speed change mode in response to recognizing that a target object presents a target state in a captured video image; obtaining a target video according to the captured video image and the audio; and playing, in the target video, a video image captured before the target object presents the target state at a constant speed, and playing, in the target video, a video image captured after the target object presents the target state at a changing speed according to a second speed change mode, where the audio is played at a constant speed.

Abstract: A display substrate, a display apparatus and a manufacturing method are provided. The display substrate includes: a base substrate; a first electrode layer on a side of the base substrate; a light-emitting layer on a side of the first electrode layer facing away from the base substrate including a plurality of light-emitting portions; a second electrode layer on a side of the light-emitting layer facing away from the first electrode layer; a first transparent inhibitor layer including a plurality of mutually separated first pattern portions; and an auxiliary electrode layer including an auxiliary electrode pattern formed by inhibition of the first pattern portions, where at least part of an orthographic projection of the auxiliary electrode pattern on the base substrate is separated from orthographic projections of the first pattern portions on the base substrate, and the auxiliary electrode pattern is in contact and electrically connected with the second electrode layer.

Abstract: A MEMS microphone includes a substrate, a supporting plate, a capacitor system, a first pad, and a first electrode. The substrate defines a back cavity, the supporting plate is disposed at one side of the substrate and defines an accommodation cavity, and the capacitor system is disposed at the supporting plate. The capacitor system includes a back plate, a fixing component, and a vibrating diaphragm. The vibrating diaphragm is fixed to one side of the fixing component distal from the back plate. The vibrating diaphragm forms a cantilever structure fixing at the middle, and the first electrode is only connected to a central region of the vibrating diaphragm, the first electrode may not interfere with deformation of an edge region of the vibrating diaphragm, thereby improving sensitivity of the MEMS microphone through fully releasing residual stress of the vibrating diaphragm.

Abstract: A lower completion screen, for operating in a wellbore, includes: a body; a screening surface disposed on the body, wherein the screening surface includes a plurality of holes; a plurality of rollers disposed on the body; and a power system. A first group of the plurality of rollers is disposed on a first end of the body, and a second group of the plurality of rollers is disposed on a second end of the body. The power system is disposed on the second end of the body, and controls movement of the lower completion screen in the wellbore.

Abstract: The present invention discloses a Micro-Electro-Mechanical System MEMS) chip including a substrate with a back cavity; a capacitance system disposed on the substrate including a back plate, a membrane opposite to the back plate forming an inner cavity; a protruding portion accommodated in the inner cavity, fixed on one of the back plate and the membrane and spaced apart from the other along a vibration direction; a reinforce portion fixed to the membrane, having an area smaller than that of the membrane; a support system configured to support the capacitance system, including a first fixation portion suspending the membrane on the substrate, and a second fixation portion suspending the back plate on the substrate. The MEMS chip has higher sensitivity, higher resonance frequency and higher low frequency property.

Abstract: The present disclosure provides an organic light-emitting diode display substrate. The organic light-emitting diode display substrate includes: a light-emitting layer, a light modulation layer, and a color conversion layer, in which the light-emitting layer is configured to emit first color light, the light modulation layer and the color conversion layer are arranged on different light-exiting paths of the light-emitting layer, the color conversion layer is configured to convert first color light into second color light and third color light, and the light modulation layer is configured to modulate an emergent direction of first color light.