167 results about "Cell technology" patented technology

The invention discloses an optical multi-pass pool modeling and optimizing method, and belongs to the technical field of optical detection. In order to solve the problems that an existing multi-pass cell is too long in length, large in size and inconvenient to carry or transfer, and meanwhile, the mirror surface utilization rate of the multi-pass cell is low, a light path in a multi-pass cell system is accurately modeled by adopting a light ray tracing principle, and the system does not depend on traditional paraxial approximation. The problems that in the prior optical design, due to the fact that equipment is large in size, carrying is inconvenient, and due to the fact that aberration is neglected due to paraxial approximation, large deviation is generated between a calculated value and an actual value are solved. In addition, the light spot distribution is automatically optimized through the genetic algorithm, and the design and debugging time of the optical system is shortened. According to the innovative design strategy, the utilization rate of the reflector is improved, space waste is avoided, the sensitivity and accuracy of a reflection system can be remarkably improved, and further development of the optical multi-pass cell technology is promoted.

The invention discloses conductive paste, a crystalline silicon solar cell and a preparation method of the crystalline silicon solar cell, and belongs to the technical field of photovoltaic cells. The conductive paste comprises glass powder which accounts for 1.5 wt%-6 wt% of total solids in the conductive paste; an organic carrier accounting for 9 wt% to 15 wt% of total solids in the conductive paste; a first conductive metal, which accounts for 70 wt% to 88 wt% of total solids in the conductive paste; a second conductive metal which accounts for 1 wt% to 10 wt% of the total solid content in the conductive paste; wherein the specific surface area of the second conductive metal is larger than 0.5 m < 2 > / g and smaller than 1.8 m < 2 > / g, and the second conductive metal is selected from nickel or nickel alloy. The nickel or the nickel alloy with the specific surface area is adopted to replace part of silver, the influence on the density of a sintered silver structure and the conductivity of a silver / nickel electrode can be reduced, the photoelectric conversion efficiency of the solar cell can be maintained by adding the nickel powder, and the preparation cost of the solar cell can be reduced by reducing the use amount of the silver.

The invention belongs to the technical field of solar cells, and particularly relates to a wide-band-gap perovskite solar cell with high open-circuit voltage and a method of the wide-band-gap perovskite solar cell. Derivative molecules of ethylenediamine and phenylethylamine and corresponding halide salt materials thereof are introduced below a perovskite light absorption layer of the wide-band-gap perovskite solar cell to serve as a buried interface modification layer, so that the performance of the cell is remarkably improved. Derivative molecules of ethanediamine and phenylethylamine and corresponding halide salt materials thereof can provide free electron pairs, and form a stable coordination structure with uncoordinated Pb < 2 + > ions in perovskite, thereby realizing regulation and control of perovskite crystallization kinetics. According to the invention, the crystallization quality of the wide-band-gap perovskite thin film is improved, and the method has the potential of promoting rapid development of an efficient three-junction laminated cell technology.

The invention relates to the technical field of energy conservation and emission reduction, and particularly provides a solid oxide cell technology and coal chemical industry coupling system and an operation method thereof, and the system comprises a coal chemical industry section, a solid oxide fuel cell power generation section and a solid oxide electrolytic cell water electrolysis hydrogen production section. According to the method, a solid oxide electrolytic cell technology is adopted, green electricity hydrogen production is used for supplementing hydrogen to replace a conversion section in the coal chemical process, so that generation of carbon dioxide is reduced, consumption of CO is avoided, in addition, the solid oxide electrolytic cell can also electrolyze CO2, CO2 is converted into CO and oxygen to serve as reaction raw materials, and the carbon reduction effect is achieved; the problems of large carbon emission and CO2 capture and utilization in the production process of coal chemical enterprises are effectively solved.

The invention is suitable for the technical field of batteries, and provides a solar battery, a photovoltaic module, a photovoltaic system and a printing screen printing plate, the solar battery comprises a silicon substrate and a plurality of auxiliary grids, and the plurality of auxiliary grids comprise two kinds of auxiliary grids with different polarities; the plurality of auxiliary grids are arranged on the silicon substrate and extend along a first direction, two kinds of auxiliary grids with different polarities are alternately arranged at intervals along a second direction, and the first direction and the second direction are crossed; in the plurality of auxiliary grids, the distances between the first auxiliary grid and the second auxiliary grid and between the first auxiliary grid and the third auxiliary grid are not equal; the second auxiliary grid and the third auxiliary grid are adjacent to the first auxiliary grid and are different from the first auxiliary grid in grid performance; in the auxiliary grid with the same grid polarity as the first auxiliary grid, the distance between the first auxiliary grid and the fourth auxiliary grid and the distance between the first auxiliary grid and the fifth auxiliary grid are not equal, and the fourth auxiliary grid and the fifth auxiliary grid are adjacent to the first auxiliary grid. According to the solar cell, the photovoltaic module, the photovoltaic system and the printing screen provided by the invention, the problem of grid breakage can be reduced, and the product yield of the solar cell is improved.

The utility model discloses cell culture equipment for cell technology research and development in the technical field of cell culture, which comprises a culture equipment body, a transverse plate for supporting is mounted on the inner side of the body, and a placement rack for fixing test tubes is mounted on the inner side of the body and positioned at the top of the transverse plate. A plurality of fixing grooves which are circumferentially arranged are formed in the top of the placing frame, a shaking assembly used for shaking test tubes is installed on the inner side of the body and located in the center of the inner side of the transverse plate, the multiple fixing grooves can facilitate the placing frame to drive the multiple test tubes to rotate at the same time, and the limiting assembly can clamp and limit the test tubes to prevent the test tubes from being disengaged; the shaking assembly can drive the test tube to rotate back and forth, so that the problems that the cell sap is easy to overflow or scatter, the cell sap is inconvenient to shake back and forth in two directions for mixing, the test tube loaded with the cell sap is easy to loosen, the test tube is separated and damaged, and the cell sap is wasted are solved; the efficiency and the practicability of shaking and mixing the cell sap by the equipment are influenced.

The invention relates to the technical field of photovoltaic cells, and provides a benzene ring compound modified SAM layer and a perovskite module preparation method, the benzene ring compound modified SAM layer comprises self-assembly molecules and an agglomeration inhibitor, the agglomeration inhibitor is dispersed in the self-assembly molecules, and the self-assembly molecules are dispersed in the agglomeration inhibitor. The agglomeration inhibitor is used for inhibiting agglomeration of the self-assembled molecule, the agglomeration inhibitor comprises a benzene ring and at least one X group connected to the benzene ring, the structure of the X group is-R, and-R is any one of a fluorine group, a nitrile group and a nitro group. The SAM layer modified by the benzene ring compound can solve the problems that carrier loss of an interface between a perovskite thin film and a hole transport layer is easily caused by high self-aggregation and poor wettability of self-assembled monomolecules, uneven surface appearance of the SAM layer is caused, and then the subsequent growth and covering quality of the perovskite thin film are influenced.

The invention discloses a panda immortalized kidney cell line GPK-1 as well as a preparation method and application thereof, and belongs to the technical field of immortalized cells. The preparation method comprises the following steps: (1) collecting kidney tissues of dead pandas, and soaking the kidney tissues in a protective solution; (2) carrying out two-step digestion on the kidney tissue treated in the step (1); and (3) carrying out culture passage on the digested cells, then infecting the passage cells with lentiviruses carrying neomycin resistance genes and SV40-LT genes, and then screening to establish the panda immortalized kidney cell line. The invention provides a technology for efficiently separating and culturing panda nephrogenic cells, and establishes an immortalized panda nephrogenic cell line GPK-1. Compared with primary kidney cells of pandas, the GPK-1 retains normal karyotype and related molecular characteristics and is remarkably improved in the aspects of cell passage times, proliferation efficiency and transfection efficiency.

The invention belongs to the technical field of molecular biology and cells, and provides a construction method of an iPSC-sourced IL-10 protein overexpression MSC cell strain. The construction method comprises the following steps: constructing an exogenous IL-10 protein expression cassette of which an MSC specific promoter starts transcriptional activity, then stably inserting the protein expression cassette into human iPSC cells by virtue of a CRISPR / Cas 9 technology, and then inducing and differentiating the iPSC cells, so as to obtain the MSC cell strain of over-expressed IL-10 protein. The MSC for overexpressing the IL-10 protein can efficiently regulate the immune environment in the joint, and has a better treatment effect compared with the MSC from a natural source.

The utility model provides a back contact photovoltaic assembly and a photovoltaic system, and relates to the technical field of photovoltaic cells. According to the utility model, the back contact photovoltaic assembly is divided into the first battery string group and the second battery string group, and the middle bus bar is arranged between the first battery string group and the second battery string group for parallel connection. The chamfered edge of one back contact battery piece, closest to the middle bus bar, in each battery string included in the first battery string group faces the middle bus bar, and the right-angle edge of one back contact battery piece, closest to the middle bus bar, in each battery string included in the second battery string group faces the middle bus bar. It is ensured that a BC battery string reserved welding strip (namely a leading-out welding strip close to the bending position of the middle bus bar) composed of an even number of BC battery pieces with main grid anodes and cathodes arranged in a crossed mode is bent away from the middle bus bar, and the welding difficulty is reduced.

The invention relates to the technical field of photovoltaic cells, in particular to a large-size N-type silicon wafer for a BC cell, a preparation method of the large-size N-type silicon wafer and the BC cell. The size of the large-size N-type silicon wafer is larger than or equal to 230 mm * 230 mm, the thickness of the large-size N-type silicon wafer is 90-130 microns, the edge of the large-size N-type silicon wafer is an arc chamfer, and the edge is wrapped with a SiNx layer; the large-size N-type silicon wafer comprises a central area and an edge area surrounding the central area, and the content of doped element antimony in the edge area is smaller than or equal to 1 * 10 < 15 > atoms / cm < 3 >. And the content of the doped element antimony in the central region is 1 * 10 < 16 >-5 * 10 < 16 > atoms / cm < 3 >. By arranging the edge arc chamfer, wrapping the SiNx layer and performing edge low doping, the mechanical strength can be ensured, the fragment rate can be reduced, meanwhile, edge carrier recombination can be reduced, the open-circuit voltage can be improved, and the power output of the battery can be improved.

The invention relates to the technical field of solid fuel cells, and discloses a solid fuel cell tail gas heat energy cascade recycling system which comprises a tail gas component analysis module, a heat exchange topology construction module, a phase change heat storage control module, a residual pressure power generation adaptation module, a cascade scheduling decision module and a recycling efficiency monitoring module. The tail gas component analysis module generates a component concentration distribution map through mass spectrometry detection; the heat exchange topology construction module establishes a multi-stage heat exchanger network according to the atlas and optimizes parameters; the phase change heat storage control module deploys a phase change material array, divides a temperature control area and generates heat storage data; the excess pressure power generation adaptation module collects pressure signals and fits turbine characteristics to generate power generation parameters; the cascade scheduling decision module constructs a model through a dynamic programming algorithm and generates a scheduling instruction; and the reuse efficiency monitoring module tracks the state in real time and corrects parameters. The system realizes stepped recovery of tail gas heat energy, pressure energy and combustible components, improves energy efficiency and stability, and is suitable for solid fuel cell tail gas treatment.

The invention relates to a display panel and a display device. The display panel includes a substrate; the light-emitting unit is arranged on one side of the substrate, and the light-emitting unit comprises a first electrode, a light-emitting functional layer and a second electrode which are stacked in the direction away from the substrate; the isolation structures are arranged on one side of the substrate, and the adjacent light emitting units are arranged at intervals through the isolation structures; wherein the isolation structure comprises a first touch control part and a first conductive part, and the first touch control part and the first conductive part are arranged on the same layer and are electrically insulated; and the second electrode is electrically connected with the first conductive part. Therefore, compared with a display panel adopting an On-Cell technology, on one hand, the number of film layers of the touch module is reduced, so that masks are reduced, and the manufacturing cost is reduced; on the other hand, the thickness of the display panel is reduced, and lightening and thinning of the display panel are facilitated.

This application relates to the field of photovoltaic cell technology, and more particularly to a back-contact cell, a back-contact tandem cell, and a photovoltaic module. The back-contact cell includes a body, a fine grid, a first pad, a first connecting line, and edge grid lines. The fine grid includes a first fine grid and a second fine grid. The first connecting line and the first fine grid are electrically connected to the first pad, and the second fine grid is insulated from the first pad. The second fine grid includes a first grid line and a plurality of second grid lines arranged along a second direction. The first grid line and the first connecting line are arranged along the second direction, and the second grid lines and the first connecting line are arranged along a first direction. In the first direction, the fine grid is located on one side of the edge grid lines. Both the first and second grid lines are electrically connected to the edge grid lines, improving the brightness uniformity of EL testing and the output power of the back-contact cell. Furthermore, in the first direction, the length of the first grid line is not less than the sum of the lengths of the plurality of second grid lines to improve the current transmission capability of the first grid line, thereby increasing the output power of the back-contact cell.

The present invention relates to the field of photovoltaic cell technology, namely, a bionic model for photovoltaic cell defect detection based on mimetic vision. It comprises three parts: (1) backbone network: the backbone network is used to extract effective information from the image and map the original data into the required space. The features extracted by the backbone network are passed to the neck network; (2) neck network: the neck network is used to fuse features of different scales and levels and enrich the expression capability of the features. The features fused by the neck network are passed to the detection head; (3) detection head: the detection head is mainly responsible for predicting the features, generating bounding boxes and predicting categories. The backbone network based on human receptive field and visual mechanism has a stronger abstraction capability for features and can efficiently extract effective features from photovoltaic cell electroluminescent images with single color and complex texture. The proposed neck network can effectively enhance the expression capability of defect characteristics in photovoltaic cell electroluminescent images.

The invention is suitable for the technical field of photovoltaic cells, and provides a manufacturing method of a grid line and a mask thereof, a photovoltaic cell and a module and system thereof. The manufacturing method of the grid line mask comprises the following steps: providing a battery substrate of which the grid line mask is to be manufactured, wherein the working surface of the battery substrate comprises a grid line area and a non-grid line area; placing the battery substrate in the working groove; in the working groove, liquid materials are attached to the whole working face; curing the liquid material attached to the working surface to form a coating; the coating of the grid line area is removed, a grid line mask is formed in the non-grid line area, and the grid line mask covers the edge area of the working face. Therefore, the battery substrate does not need to be placed on the table top of the workbench, the workbench cannot be polluted when the coating is manufactured, mask manufacturing of other battery substrates cannot be affected, the edge area of the working face can be covered by the mask, the situation that the grid line material is accumulated in the edge area and is difficult to remove during electroplating is avoided, and the risk of poor electrical property such as short circuit can be reduced.

The invention relates to the technical field of cells, and provides a cell image acquisition device and method. According to the device, a groove is formed in one side of a culture container, and a protruding part facing an opening of the groove is arranged at the bottom of the groove; the first reflecting device and the second reflecting device are arranged on a connecting surface of the side surface of the lug boss and the side surface of the groove, and a first reflecting surface of the first reflecting device and a second reflecting surface of the second reflecting device are oppositely arranged; light rays of the light source can be reflected by the first reflecting surface, penetrate through the convex part, reach the second reflecting surface, and reach the imaging lens after being reflected by the second reflecting surface, so as to collect a cell image of cell sap in the culture container. According to the cell image acquisition device provided by the invention, the cell image of the cell sap can be acquired by utilizing the reflection of light, so that the cell sampling is completed, an external device is not adopted to contact the cell sap in the whole process, the pollution to the cell sap is avoided, and the adverse effect on the cell growth is avoided.

The present application relates to the field of photovoltaic cell technology, and more specifically to a method for preparing a solar cell and a solar cell. The solar cell includes a grid line, and the method comprises: preparing a silicon substrate, wherein the back surface of the silicon substrate has a first region and a second region, the grid line is projected in the first region along the thickness direction of the solar cell, and the second region is a region outside the first region; texturing the front and back surfaces of the silicon substrate; forming an emitter on the front surface of the silicon substrate; sequentially forming a tunneling oxide layer and a doped conductive layer on the back surface of the silicon substrate; and removing the tunneling oxide layer and the doped conductive layer at a position on the back surface of the silicon substrate corresponding to the second region. By eliminating the tunneling oxide layer and the doped conductive layer in the second region, parasitic absorption in the second region can be reduced, preventing the tunneling oxide layer and the doped conductive layer in the second region from absorbing a large amount of incident light, resulting in light energy being converted into heat energy rather than electrical energy, thereby improving the operating efficiency of the solar cell.

The invention relates to the technical field of perovskite cells, provides a perovskite cell and a preparation method thereof, a laminated cell and a photovoltaic module, and at least can realize low-cost and high-performance stable trans-PSCs application. The perovskite cell comprises a hole transport layer, a perovskite absorption layer, an electron transport layer and an electrode, the hole transport layer comprises a hole transport material, the structural formula of the hole transport material is # imgabs0 #, and A is independently an O atom or an S atom.

The present invention relates to the field of photovoltaic cell technology, and more particularly to a photovoltaic cell parameter identification system based on environmental parameter optimization. A target function for the arc fault characteristics corresponding to the photovoltaic cell is derived from the pre-acquired output volt-ampere characteristics of the photovoltaic cell and the environmental parameters of the photovoltaic cell. The target function includes the arc fault characteristic parameters corresponding to the photovoltaic cell to be identified, and is optimized using a particle swarm optimization algorithm to identify the parameter values ​​of the arc fault characteristic parameters corresponding to the photovoltaic cell. The photovoltaic cell's volt-ampere characteristic parameters C1 and C2, the change in photovoltaic cell temperature ΔT, and the change in photovoltaic cell solar irradiance ΔS are selected. These four parameters can both reflect the photovoltaic condition after an arc fault and distinguish output fluctuations caused by environmental changes. This provides the best basis for determining whether the photovoltaic cell has loose connection contacts or damaged DC lines during operation, thereby improving the safety performance of the photovoltaic cell.

The invention relates to the technical field of cells, and provides a cell imaging chip, an imaging system, a cell detection system and a detection method. The chip comprises a layer plate and an imaging plate, the imaging plate is arranged at the bottom of the layer plate, and a gap layer is arranged between the imaging plate and the layer plate; the laminated plate is provided with a flow guide flow channel, the flow guide flow channel comprises a liquid inlet flow channel and at least one flow guide groove, and the flow guide groove is respectively communicated with the liquid inlet flow channel and the gap layer, so that cell imaging is carried out after a cell sample flowing into the flow guide groove from the liquid inlet flow channel is guided to the gap layer. According to the cell imaging chip provided by the invention, miniaturization, low cost and easy operation of cell detection equipment are possible, and the cell imaging chip can be used for carrying out instant cell detection in common consulting rooms, remote rural hospitals and even families.

This invention relates to the field of organic photovoltaic cell technology, and particularly to a low-melting-point alloy top electrode, its preparation method, and its application. The preparation method of the low-melting-point alloy top electrode includes the following steps: heating and melting a low-melting-point alloy, adding it to a syringe equipped with a heating head, and using a temperature control system to control the heating head on the syringe to maintain the low-melting-point alloy in a liquid state; controlling printing parameters so that the liquid low-melting-point alloy is pulled out from the syringe needle by shear force and printed onto a substrate; and cooling to obtain the low-melting-point alloy top electrode. This invention uses a solid low-melting-point alloy as raw material and employs fused deposition modeling to prepare a low-temperature alloy top electrode as the top electrode for organic photovoltaic cells. Its electrode film thickness is controllable, enabling the preparation of alloy films with a thickness of less than 100 μm, thereby saving materials and costs; it also exhibits good repeatability, low printing cost, and is suitable for the preparation of large-area battery modules.

The utility model relates to the technical field of cells, in particular to a cell freezing box, a box body is arranged in the cell freezing box, a top cover is fixedly arranged on the upper end face of the box body, a rotary sealing frame above the cell freezing box is rotated, so that the rotary sealing frame and a sealing top block move upwards until the rotary sealing frame is completely taken out of a sealing top cavity; the frozen test bottles in the test bottle storage cavities located on the same side can move upwards to enter the sealing top cavity under the influence of resilience force of the ejection spring and finally move to the upper side of the top cover, at the moment, workers can take out the frozen test bottles, and after the frozen test bottles are taken out, the rotary sealing frame is installed again, so that the test bottles can be taken out independently; according to the utility model, the problem that cells in other test bottles are unfrozen due to temperature difference generated by contact between the test bottles and the outside when the test bottles are taken out can be greatly reduced, and the cell survival rate is improved.

The present invention relates to the field of photovoltaic cell technology and provides a method for preparing a solar cell and a solar cell. The method for preparing a solar cell comprises: providing a silicon substrate having a first surface, the first surface comprising a plurality of spaced-apart first regions and a second region located between two adjacent first regions; forming a silicon oxide dielectric layer on the second region; sequentially forming a tunneling oxide layer and a doped polysilicon layer on the first surface, the tunneling oxide layer covering the first region and the silicon oxide dielectric layer, and the doped polysilicon layer covering the tunneling oxide layer; and patterning the doped polysilicon layer and the tunneling oxide layer to selectively remove the doped polysilicon layer and the tunneling oxide layer on the second region. This application solves the problem of poor passivation effect in high-efficiency cells using local contact technology.

The utility model relates to the technical field of cells, in particular to a cell culture dish observation device which comprises a bottom plate, an observation shell fixedly connected to the upper end face of the bottom plate, an observation cavity formed in the observation shell, four lifters fixedly arranged on the lower end wall of the observation cavity, lifting rods in power connection with the lifters, and rotating rings fixedly connected to the upper end faces of the lifting rods. The upper end of the rotating ring is rotationally connected to a lifting plate, and the lifting plate can limit the cell culture dish, so that cells in the cell culture dish can be conveniently observed; a plurality of mounting holes are formed in the lower end wall of the observation cavity, lamp poles can be inserted into the mounting holes, adjusting blocks are fixedly connected to the upper end faces of the lamp poles, adjusting cavities are formed in the adjusting blocks, adjusting motors are fixedly arranged on the adjusting blocks, adjusting motors are in power connection with adjusting shafts, the adjusting shafts are fixedly connected with connecting rods, and illuminating lamps are fixedly connected to the connecting rods; the illuminating lamp can illuminate, the adjusting motor drives the adjusting shaft to rotate, then the illuminating lamp is driven to rotate to adjust the illuminating angle, and observation is facilitated.

The present application relates to the field of solar energy and solid oxide cell technology, and provides a solar multi-generation system based on RSOC and a control method, the system comprising: an RSOC stack module, a photovoltaic device, a first molten salt system and a second molten salt system; the RSOC stack module is in power generation mode SOFC and electrolytic hydrogen production mode PV-SOEC-PTC respectively; high-temperature oxygen-enriched air at the outlet of the RSOC stack module heats air in an air preheater after passing through a combustor, so as to realize heat energy recycling; during operation, high-temperature molten salt in the high-temperature molten salt tank of the second molten salt system enters the RSOC stack module to release heat, so as to maintain the stable working temperature of the stack; the heat-exchanged molten salt is transported to the low-temperature molten salt tank for storage, and at the same time, the first molten salt system is synchronously operated to complete the preheating of water. The high-temperature and low-temperature molten salt tanks of the second molten salt system realize bidirectional heat storage temperature control, and cooperate with the solar molten salt preheating of the first molten salt system, so as to realize efficient switching and stable and controllable temperature of SOFC power generation and SOEC electrolysis modes.

The present invention discloses a giant panda immortalized kidney cell line GPK‑1, a preparation method and a use thereof, and belongs to the field of immortalized cell technology. The preparation method is as follows: (1) collecting kidney tissue of a dead giant panda and immersing it in a protective solution; (2) performing two-step digestion on the kidney tissue treated in step (1); (3) culturing and propagating the digested cells, and then infecting the propagated cells with a lentivirus carrying a neomycin resistance gene and an SV40‑LT gene, and then screening and establishing a giant panda immortalized kidney cell line. The present invention provides a technology for efficiently isolating and culturing giant panda kidney-derived cells, and establishes an immortalized giant panda kidney-derived cell line GPK‑1. Compared with primary giant panda kidney cells, GPK‑1 retains normal karyotype and related molecular characteristics, and has been significantly improved in terms of cell passage times, proliferation efficiency and transfection efficiency.

The invention discloses an application of a GmEF9 gene in enhancing soybean nematode resistance. The application of the GmEF9 gene or a biological material related to the GmEF9 gene in at least one of the following aspects: A1) regulating and controlling the soybean nematode resistance or preparing a product for regulating and controlling the soybean nematode resistance; a2) cultivating soybeans with improved nematode resistance or preparing products for improving the nematode resistance of the soybeans; a3) preparing transgenic soybeans; the nucleotide sequence of the GmEF9 gene is as shown in SEQ ID NO. 1. The gene GmEF9, which is remarkably and highly expressed in syncytial bodies of disease-resistant varieties, is successfully identified by comparing and analyzing gene expression profiles of the disease-resistant and susceptible soybean varieties in SCN-infected early-stage root tissues by utilizing a single cell nucleus transcriptome technology. The over-expression of GmEF9 can significantly enhance the SCN resistance of infected soybeans and effectively inhibit the development of nematodes in roots (J3-J4 stage). The research not only provides a new key gene resource for soybean anti-SCN breeding, but also provides a method example for analyzing a plant-pathogen interaction mechanism by using a leading-edge single cell technology.

The utility model relates to the technical field of photovoltaic cells, and provides a water surface photovoltaic system which comprises a photovoltaic assembly, a floating body and a connecting block. The connecting block is of a hollow structure and comprises a first connecting surface and a second connecting surface, a first mounting hole is formed in the first connecting surface and used for mounting the connecting block, and a second mounting hole is formed in the second connecting surface and used for mounting the photovoltaic module; the floating body is provided with a mounting surface, and the mounting surface is detachably connected with the first connecting surface; the photovoltaic module is fixedly arranged on the fixing frame, and the fixing frame is fixed on the second connecting surface. According to the embodiment of the invention, the photovoltaic module is high in strength, is not liable to deform, is tightly connected with the floating body through the hollow connecting block, is small in resistance, is high in stability, is convenient to install, and is easy to maintain.

The invention provides a methanol fuel tank for a fuel cell, the methanol fuel tank comprises a fuel tank main body and a fuel tank upper cover, an EPTFE membrane, a membrane sealing ring, a miniature PP5 one-way valve core, a valve core fixing seat and a silica gel liquid inlet pipe are sequentially integrated in the fuel tank main body; the fuel tank upper cover is composed of an upper cover screwing seat, a liquid inlet communicating vessel and a liquid inlet sealing ring. According to the methanol fuel tank, the risk of methanol leakage in the fuel tank can be effectively reduced, and methanol cannot be leaked out of the fuel tank under the condition that no pressure difference exists between the position of the liquid inlet communicating vessel and the outside, so that the use performance of a methanol fuel cell power supply is improved; and meanwhile, the methanol fuel tank can be used at 360 degrees by utilizing the universal silica gel liquid inlet pipe, so that the use directivity of the methanol fuel cell is improved. According to the design, the safety, the environmental protection property and the stability of the direct methanol fuel cell are improved, the use performance and the flexibility of the direct methanol fuel cell are also remarkably improved, and powerful support is provided for popularization and application of a methanol fuel cell technology.