13 results about "Blue band" patented technology

The present disclosure provides a Group II-VI core-shell quantum dot and a preparation method therefor. A quantum dot shell having a gradient alloy structure is gradually grown by using a precursor that has a reactivity gradient. The gradient alloy structure has a band gap that gradually increases from inside to outside, thereby solving the problem of difficulty in epitaxial growth caused by a decrease in the surface activity of a quantum dot along with an increase in the size thereof. By using zinc halide and octanethiol to regulate crystal facets, the proportion of polar facets on the surface of the quantum dot is increased, and the stability of the quantum dot is significantly improved. Moreover, provided is a low-cadmium quantum dot core. A hot-injection method is used to perform nucleation and growth of ZnSe at a high temperature, a cadmium precursor is then added after the stable nucleation of ZnSe, and cadmium / zinc ion exchange is performed by utilizing the binding energy of selenium / cadmium that is stronger than that of selenium / zinc, thereby forming a CdZnSe ternary core, which can solve the problem of it being difficult for blue-light quantum dots that use CdZnSe as a light-emitting core to cover the pure blue band.

The invention discloses a duckweed type eutrophication water body monitoring method based on sentinel No.2 satellite images, and relates to the technical field of water body monitoring, and the method comprises the following steps: carrying out atmospheric correction processing on sentinel No.2 L1 C-level satellite images in a non-duckweed growth season and a duckweed growth season, and then re-sampling all wave bands to the same resolution; performing mean filtering on a blue wave band, a green wave band, a red wave band, a near-infrared wave band and a narrow near-infrared wave band of the multi-wave-band surface reflectance image after re-sampling in the non-duckweed growth season and the duckweed growth season, and then performing wave band synthesis to obtain a non-duckweed growth season wave band synthesis image and a duckweed growth season wave band synthesis image; and calculating the proportion of the duckweed growth range in the water body range by using the non-duckweed growth season waveband synthetic image and the duckweed growth season waveband synthetic image. The duckweed type eutrophication water body can be rapidly monitored in a large range at low cost.

The application discloses a kind of based on sentinel-2 satellite image's duckweed type eutrophication water monitoring method, it is related to water monitoring technical field, including the following steps: after the atmospheric correction processing of sentinel-2 L1 C level satellite image of non-duckweed growing season and duckweed growing season, all wavebands are resampled to the same resolution, after mean filtering to the blue band, green band, red band, near infrared band, narrow near infrared band of multi-band surface reflectance image after resampling of non-duckweed growing season and duckweed growing season, then band synthesis is carried out, obtain non-duckweed growing season band synthesis image and duckweed growing season band synthesis image;The proportion of duckweed growing range in water range is calculated using non-duckweed growing season band synthesis image and duckweed growing season band synthesis image.The present application can realize the fast, large-scale, low-cost duckweed type eutrophication water monitoring.

The invention belongs to the technical field of remote sensing application, and relates to a fire point identification method and system based on medium-high resolution satellite remote sensing data. The method comprises the following steps: acquiring spectral data of an ultra-blue wave band, a SWIT1 wave band and a SWIT2 wave band of a medium-high resolution satellite; calculating the reflectivity of the spectral data of the ultra-blue wave band; performing cloud removal processing to calculate the radiance values of SWIT1 wave bands and SWIT2 wave bands of all pixel points in a non-cloud area; calculating normalized short wave infrared difference indexes of all pixel points; and based on the normalized short-wave infrared difference index, performing fire point identification on the non-cloud region data by adopting a decision tree. According to the invention, early-stage small-scale fire points can be identified, and fire point rapid spreading caused by fire early-stage identification lag can be avoided to form a large-scale fire; fire point misjudgment or missed judgment caused by misjudgment of cloud layer shadows and high-reflection ground objects as suspected fire points is avoided; and in combination with the waveband characteristics of the medium-high-resolution satellites, the data advantages of the medium-high-resolution satellites are brought into full play, and the fire point identification precision is improved.

The fabrication process of a transparent display screen based on the triple strong directional scattering of dielectric particles includes the following steps: (1) mixing transparent substrate material and dielectric sphere particles in a mixer; (2) drying the mixed material in a drying oven to remove moisture; (3) stretching the uniformly mixed and dried material in a casting machine to ensure that the thickness of the stretched film does not exceed 0.1 mm. The mechanism of the color transparent display screen provided by this invention is the triple strong directional scattering of dielectric particles, which can simultaneously achieve high forward scattering characteristics of red, green and blue bands in simple dielectric sphere particles. Therefore, most of the light can be localized to one side of the display screen, which is significantly improved in terms of display brightness and color display compared to the reported nanostructures that only support a single LSP resonance. The thickness of the transparent display screen can be controlled below 0.1 mm, which provides a new idea and method for the fabrication of transparent display screens based on the strong directional scattering of dielectric particles and has great application prospects.

The present disclosure provides a II-VI core-shell quantum dot and a preparation method thereof. By using a precursor with a gradient change in reactivity to gradually grow a quantum dot shell with a gradient alloy structure, the gradient alloy structure has a gradually increasing band gap from the inside to the outside, solving the problem that quantum dots are difficult to be epitaxially grown due to the decrease in surface activity with the increase in size. By using zinc halide and octyl mercaptan for crystal face regulation, the proportion of the polar surface of the quantum dot surface is increased, and the stability of the quantum dot is significantly improved. Furthermore, a little-cadmium quantum dot core is provided, by using a hot injection method to perform nucleation and growth of ZnSe at a high temperature, and then adding a cadmium precursor on the basis of stable nucleation of ZnSe, using the stronger binding energy of selenium / cadmium than selenium / zinc for cadmium / zinc ion exchange, and then forming a CdZnSe ternary core, the problem that it is difficult for a blue quantum dot with a CdZnSe light-emitting core to cover a pure blue band can be solved.

The invention relates to the technical field of remote sensing image processing, in particular to a small beach shoreline accurate extraction method and system based on bare soil-water body double-index collaboration, and the method comprises the following steps: obtaining a multi-temporal Landsat surface reflectance image set which covers a target area and is subjected to radiometric calibration and wave band unified naming; obtaining a clean image set; generating a binary beach mask based on the surface reflectance of each pixel in the clean image set in a blue band, a green band, a red band, a near-infrared band and a short-wave infrared band; performing morphological closing operation on the binary beach mask to fill the fine holes to obtain a continuous mask; vectorizing and geometrically simplifying the continuous mask to obtain an initial beach face vector; and performing post-processing operation on the initial beach face vector to obtain a final beach boundary vector. According to the technical scheme, the beach can be effectively distinguished from adjacent water bodies, vegetation, buildings and other ground objects, and false lifting and missing lifting are remarkably reduced.

Light-emitting diode module, LED module, which is configured to emit white light, wherein the LED module has: a blue light-emitting diode (30) configured to emit blue light with a first peak wavelength in a range of 420 nm to 465 nm; at least one wavelength conversion material (54, 56) configured to convert part of the blue light into converted light of another wavelength; and a near-infrared wavelength conversion material (58) configured to be excited by the blue light of the blue light-emitting diode (30) to emit an additional light with a second peak wavelength in a range of 740 nm to 900 nm and a full width at half maximum (FWHM) of 120 nm or less, wherein the near-infrared wavelength conversion material (58) Ca(Al 12-x-y ,Ga y )O 19 :xCr 3+ (0≤x≤1, 0≤y≤6) exhibits, where the converted light, another part of the blue light, and the additional light combine to form the white light, and wherein a spectrum of the white light thus formed has a peak intensity in the range of 740 nm to 900 nm, and the peak intensity is greater than or equal to 4.5% of a peak intensity in a blue band from 420 nm to 465 nm.

The invention discloses a stable multi-energy-band perovskite composite structure and a preparation method thereof in the technical field of photoelectric materials. The stable multi-energy-band perovskite composite structure is formed by doping lanthanide ions into CsPb (XxY1-x) 3 (X, Y = Cl, Br and I) micron sheets, the double effects of phase separation and phase pinning are achieved through a one-step chemical vapor deposition method, ion migration is effectively inhibited, the stable multi-band fluorescence emission characteristic is achieved, the emission spectrum covers red, green and blue wave bands, and the stable multi-energy-band perovskite composite structure is suitable for large-scale popularization and application. The method has a wide application prospect in the field of optoelectronic equipment.

The invention provides a salmonella lateral flow chromatography biosensor. The invention particularly relates to a sandwich lateral flow chromatography sensor consisting of a nucleic acid nano enzyme and a bacteriostatic aptamer. When a target to be detected exists, the target to be detected is combined with the nucleic acid nano-enzyme probe on the combination pad, flows through the capillary action and is specifically intercepted by the Sal5-4-17nt aptamer when passing through the T line, and the redundant nucleic acid nano-enzyme probe continuously flows to the C line through the capillary action and is intercepted and captured through hybridization among nucleic acid sequences; therefore, after the color developing solution is added, obvious blue strips appear on T and C; when the to-be-detected target does not exist, the nucleic acid nano-enzyme probe is not intercepted by the T line and is intercepted only when the to-be-detected target passes through the C line, that is, only the C line has a blue band after the developing solution is added. The test paper can realize visual detection of salmonella within 5 minutes after probe dosage and hybridization sequence design and color developing solution and color developing time optimization, and meanwhile, the test paper has good biological safety.

1. The name of the design product: parking direction selection graphical user interface for electronic device. 2. The use of the design product: an electronic device. 3. The design points of the design product: in the graphical user interface. 4. The picture or photo that best shows the design points: interface change state diagram 2. 5. Other circumstances that need to be explained: the graphical user interface is used to show the parking direction selection of the vehicle owner; in the main view, the user clicks the "I want to park" button below the interface to enter interface change state diagram 1; interface change state diagram 1 is a parking preparation interface, and after the interface is loaded, it automatically enters interface change state diagram 2; interface change state diagram 2 is the direction button in front of the vehicle, the light gray button represents the selectable direction of parking, the blue button represents the currently selected direction of parking, and the dark gray button represents the unselectable direction of parking; the gray band below the vehicle is the planned parking track, the user selects the route and clicks "Start parking out" to enter interface change state diagram 3; in interface change state diagram 3, the real-time distance to the end point is displayed in the upper left corner of the interface, and the blue band below the vehicle is the actual parking route; the bright blue block represents the end point of the reverse parking, and the parking encounters an obstacle to enter interface change state diagram 4; in interface change state diagram 4, the red block represents the obstacle encountered, and the yellow and red lines below represent the distance measured by the radar from the obstacle; after avoiding the obstacle, the parking continues to enter interface change state diagram 5; "XXXX" in the interface is the character or text content.

The invention relates to the field of semantic segmentation, and particularly discloses a multi-spectral image semantic segmentation method based on deep learning, which comprises the following steps: acquiring a target image; selecting red, yellow and blue wave bands from the target image to construct a pseudo-color image; a pre-training super-resolution generative adversarial network based on an RRDBNet architecture is adopted, and a discrimination enhancement operation is executed on the pseudo-color image; performing boundary labeling on the pseudo-color image after the discrimination rate enhancement to obtain a labeled image; and based on an improved UNet model, performing semantic segmentation on the annotated image. In the scheme, on a 16-channel multispectral data set taking betula luminifera seedlings as objects, the method combines a single multispectral camera with image enhancement in deep learning and a semantic segmentation technology, and high-precision segmentation of the plant seedlings can be realized without depending on high-resolution RGB (Red, Green, Blue) imaging equipment.

This invention discloses an RT-RPA-LFD primer set, detection method, and application for detecting Rehmannia glutinosa burn virus, belonging to the field of plant virus detection technology. The primer set includes the forward primer ReTV-RPA-4F, the biotin-labeled reverse primer ReTV-RPA-4RP, and the FAM-labeled probe ReTV-RPA-4-PE. This invention establishes an RT-RPA-LFD detection method based on this primer set. Using Rehmannia glutinosa sample cDNA template, amplification is performed at 36 ℃ for 15 min. The amplified products are visually detected using an LFD test strip. A positive result is indicated when the control line of the LFD lateral flow chromatography test strip shows a blue band and the test line shows a red band; a negative result is indicated when the control line shows a blue band and the test line shows no red band. The primer set of this invention has high specificity, can simultaneously detect ReTV1 and ReTV2, and shows no cross-reactivity with other Rehmannia glutinosa viruses; the detection sensitivity is 10 times higher than RT-PCR. 4 It is easy to operate, requires no expensive instruments, and provides intuitive results. It is suitable for rapid detection at the grassroots level and in the field, providing technical support for early warning and prevention of ReTV.