40results about How to "Increased scattering intensity" patented technology

The invention discloses a three-dimensional metal-graphene composite substrate and a preparation method thereof. The composite substrate disclosed by the invention is composed of a first nano layer, a graphene layer and a second nano layer, wherein the first nano layer is deposited on the surface of an amorphous carbon underlayer, the graphene layer is arranged on the surface of the first nano layer through spin coating, the second nano layer is deposited on the surface of the graphene layer, and the first nano layer and the second nano layer are gold or silver nano layers. According to the method, an active substrate with a good surface enhanced Raman effect is constructed; and the three-dimensional metal-graphene composite substrate is simple in preparation method, high in efficiency, and low in preparation cost.

A scattering tunable display is provided that uses reflection and edge-lit waveguide transmission modes of illumination. A front panel is provided with an array of selectable display pixels arranged in a plurality of sequences. A backlight panel includes a plurality of edge-coupled waveguide pipes formed in a plurality of rows. Each waveguide pipe has an optical input connected to a corresponding light emitting diode (LED), and an optical output index-matched to a corresponding sequence of display pixels. A display pixel is enabled and ambient visible spectrum illumination is measured. In response to the measured ambient illumination being above a first minimum threshold, the display pixel is operated in a reflective illumination mode. In response to the measured ambient illumination being below the first minimum threshold, the display pixel is operated in a transmissive illumination mode.

The invention provides a preparation method of a broadband gradient LED (Light-emitting Diode) fluorescent film. The preparation method is characterized in that broadband gradient LED fluorescent powder serves as a raw material; a uniform multicolour (red, green, blue and the like) fluorescent material film is deposited on an LED device or an LED lampshade gasket by a suspension method or a sol-gel method; and the broadband gradient LED fluorescent film prepared by the method has uniform isotropic color temperatures. The preparation method can be used for manufacturing and massively producing high-performance white LEDs with same performance, and can be used for preparing white LED devices, which can emit light approximating to sunlight, with high photoelectric conversion rates and high color rendering indexes. The broadband gradient LED fluorescent powder has a special structure and composition, and is good in dispersity, high in stacking density, great in scattering intensity and high in light-emitting efficiency.

The method includes following steps: (1) preparation of self-assembly substrate, offering a P type Si(100) substrate that is treated by ultrasonic in organic solvent; after treated by placing into Piranha solution, and it is dried by blowing non-oxidizability gas, and then is treated by OTS solution and is cleaned up by using organic solvent; (2) nano-line etching, the nano-line is etched on self assembly substrate by using current of conduct atomic force microscope, the radius of curvature of pinpoint is less than 50 nm; (3) nanometer generating, the etched substrate is placed in the silver acetate for dipping, and then is taken out to place in ethanol in short time, and then is placed in sodium borohydride aqueous solution for dipping, washing, and then is dried by blowing non-oxidizbility gas, finally the silver enhancement solution is inputted for heighten the electrode line.

The invention provides a tin telluride-based thermoelectric material and a preparation method thereof, the tin telluride-based thermoelectric material comprises the following components: tellurium, tin and aluminum, and the molar ratio of tellurium to tin to aluminum is (1-2): (1.9-2.1): (0.01-0.06). The preparation method of the tin telluride-based thermoelectric material comprises the followingsteps: respectively weighing tellurium, tin and aluminum, uniformly mixing to obtain a mixed raw material, adding the mixed raw material into a ball milling tank, vacuumizing, introducing mixed gas, and carrying out ball milling at the rotating speed of 400-480rpm for 15-20h to obtain mixed powder; and carrying out plasma sintering on the mixed powder to obtain the tin telluride-based thermoelectric material. The aluminum element is doped in the tin telluride, so that the vacancy defect of the material is overcome to a certain extent, the lattice thermal conductivity is reduced, the electricalconductivity of the material is improved, the problems of poor electrical conductivity, potential safety hazards, environmental pollution and the like are effectively solved, and the tin telluride material is convenient to popularize and use.

The invention discloses a thermal barrier coating with the abrasion resisting function. Compared with a traditional thermal barrier coating, carbon powder is added, and is sintered and modified at the high temperature, and the porosity of a ceramic phase can be increased. In the spraying process, part of particles are not smelted sufficiently in plasma jet flow, when a base body is subjected to the impact, the deformation degree is slightly weak, porous structures in lap joint together are easily formed, and the thermal insulation performance of the coating is obviously improved. In addition, by means of the modification method, Zr4+ is replaced by Y3+ and Ce4+ in a zirconium dioxide crystal lattice and the oxygen vacancy and the local stress field are generated. The phonon scattering in the crystal lattice is increased, and the thermal conductivity is obviously reduced. The atomic weight of the solid solution atom Ce is far larger than that of Y, the scattering strength of phonons in the coating can be obviously improved, and therefore the thermal conductivity is reduced. The thermal barrier coating is simple in preparing technology. The prepared coating has the beneficial effects of being high in porosity, resistant to abrasion, low in water absorbing rate, good in tenacity, not prone to cracking or layering and the like.

The invention discloses a trace explosive and drug detector and a use method thereof. The detector consists of a micro vacuum pump, a vacuum box, a heating table, a laser Raman spectrometer and a gassensor. The gas sensor is composed of a substrate and a nano-metal particle modified self-crimping micron tube on the substrate. The nano-metal particle modified self-crimping micron tube on the substrate is formed by: firstly utilizing vacuum coating equipment to prepare a multilayer film, and then conducting annealing and self-crimping at an appropriate temperature. When the detector is used fortrace explosive and drug detection, the gas sensor is disposed on the vacuum box heating table. The micro vacuum pump performs air pumping on the vacuum box to suck in trace gaseous molecules in explosives, drugs and other environments, the laser Raman spectrometer is utilized to detect the characteristic Raman peaks of the gaseous molecules, thus realizing detection of explosives, drugs and thelike. And then, heating and vacuum pumping are carried out to discharge the residual gas, and the detector can be used for cyclic measurement or standby use. The detector provided by the invention isexquisite and is ultra-highly sensitive, and is especially suitable for counter-terrorism, reconnaissance and other public safety fields.

The invention discloses a multiphase tantalum/niobate composite ceramic and a preparation method thereof. The tantalum/niobate composite ceramic comprises two or more substances with chemical formulas of AB2O6, A2B2O7, A4B2O9 and A5B4O15, A is a mixture of one or more elements of Ca, Mg, Co, Ni, Zn and Sr, B = Nb1-aTaa, and a is greater than or equal to 0 and greater than or equal to 1. The tantalum/niobate composite ceramic with multiphase composition has the advantages of uniform grain size, high density, excellent fracture toughness, high thermal stability and low thermal conductivity, and is a composite ceramic with excellent performance.

The invention belongs to the technical field of public safety, and particularly discloses a trace explosive and poison detector and a using method thereof. The trace explosive and poison detector comprises a miniature vacuum pump, a vacuum box, a heating table, a laser Raman spectrometer and a gas sensor. The gas sensor comprises a substrate and a self-curled micron tube and the self-curled microntube is arranged on the substrate and is modified by nanometer metal particles; multilayer thin films are prepared by the aid of vacuum film coating equipment and then are annealed and self-curled atthe appropriate temperatures to obtain the self-curled micron tube. The trace explosive and poison detector and the method have the advantages that the gas sensor is arranged on the vacuum box and the heating table when the trace explosive and poison detector is used for detecting trace explosive and poison, air in the vacuum box is exhausted by the miniature vacuum pump, trace gaseous moleculesin environments with the explosive, the poison and the like can be sucked, characteristic Raman peaks of the gaseous molecules can be detected by the laser Raman spectrometer, and accordingly the explosive, the poison and the like can be detected; residual gas can be heated, vacuumized and removed, circulation measurement can be carried out, or the trace explosive and poison detector can be idle for standby application; the trace explosive and poison detector is exquisite in structure, ultrahigh in sensitivity and applicable to the field of public safety of anti-terrorism, reconnaissance and the like.

The invention relates to a method for measuring X-ray scattering of liquid. The method comprises the following steps of: (1) connecting a liquid X-ray scattering sample cell in which a to-be-tested liquid sample is arranged with a circulating constant-temperature water bath, fixing the sample cell on an infrared remote control sample table of an X-ray diffractometer; (2) adjusting a light path system through a remote control device/remote controller of the infrared remote control sample table according to a common operation method of a diffractometer light path system, so as to determine a proper position for installation of the sample cell; (3) adopting Mo Kalpha as a radiation source and a super detector receiving system to carry out piecewise overlapping measurement in an X-ray scattering test measurement; and (4) carrying out data treatment and calculation, namely adopting universal Origin program on all data obtained by the measured liquid sample, firstly, correcting the data, secondly, carrying out normalization and calculating a scale factor by combining an integral method with an angle method, and finally providing relevant parameters describing a liquid space structure by calculation. The method can be applied to liquid scattering measurement experiment and data analysis; and the measurement time is effectively shortened.

The invention provides an enhanced Raman scattering sensor. The enhanced Raman scattering sensor comprises a branching end and a stranding end, wherein the stranding end comprises a stainless steel housing; a scattering prism is embedded into one end of the middle part of the stainless steel housing; the other end of the middle part of the stainless steel housing is connected with the branching end; the scattering prism comprises an integrally molded circular truncated cone and a cylinder extending out of the bottom of the circular truncated cone; the upper surface and the side surface of thecircular truncated cone are covered with Raman scattering enhanced plating layers; the lower surface of the cylinder is covered with a silver plating layer; an outgoing window and an incoming window are arranged at the center and one side of the silver plating layer respectively; the side surface of the cylinder is of a frosted structure; the lower surface of the cylinder is fitted with the end face of the stainless steel housing; the branching end comprises a receiving optical fiber and an incoming optical fiber; the receiving optical fiber and the incoming optical fiber penetrate through themiddle part of the stainless steel housing respectively and are connected to the incoming window and the outgoing window of the scattering prism; and a feedback optical fiber extends out of the middle part of the incoming optical fiber. By adopting an enhanced Raman scattering principle, the stability and precision of solution detection are improved.

The invention discloses a thermal barrier coating with high bonding strength. Aluminum powder is added, and after high-temperature calcination modification is conducted, the antioxygenic property of a ceramic phase and the permeability of matrix metal can be improved. Partial particles are not sufficiently fused in a plasma jet in the spraying process, the deformation degree is slightly weak when the particles impact on a matrix, a jointly-overlapped porous structure can be easily formed, and the thermal insulation property of the coating is improved. In addition, by means of a modification method, Zr<4+> is replaced with Y<3+> and Ce<4+> in zirconium dioxide crystal lattices, oxygen vacancies and local stress fields are produced, the phonon scattering in the crystal lattices is increased, and the thermal conductivity is significantly decreased; the atomic mass of solid solution atoms Ce is far larger than that of Y, the scattering intensity of phonons in the thermal barrier coating can be significantly improved, and therefore the thermal conductivity is decreased. The prepared thermal barrier coating is excellent in comprehensive performance, excellent in thermal insulating performance, high in bonding strength and long in thermal cycling life and thermal shock life.

The invention discloses a corrosion-resistant thermal barrier coating. The porosity of a ceramic phase can be increased after carbon powder is added and modified through high-temperature calcination, and parts of particles are slightly low in deformation degree when impacting a matrix because of not being sufficiently molten in plasma jet in the spraying process, so that an overlapped porous structure is easily formed, and furthermore the heat insulating property of the coating is remarkably improved; in addition, Zr<4+> is substituted with Y<3+> and Ce<4+> in a zirconium dioxide crystal lattice through a modification method, so that an oxygen vacancy and a local stress field are generated, the scatter of phonons in the crystal lattice is enhanced, and the heat conductivity is remarkably reduced; and the atomic weight of a solid-solution atom Ce is far larger than that of Y, so that the scattering intensity of the phonons in the corrosion-resistant thermal barrier coating disclosed by the invention can be remarkably improved, and furthermore the heat conductivity is reduced. The preparation process is simple; and the prepared coating is porous and excellent in high-temperature resistance and heat insulating property, has corrosion resistance, molten salt corrosion resistance and favorable thermal shock property and is widely applied to the fields of aviation, aerospace, traffic and energy.

The invention discloses a thermal barrier coating containing a heat insulating ceramic layer. Compared with a traditional thermal barrier coating, the coating has the beneficial effects that carbon powder is added and modified through high-temperature calcination, and therefore the porosity of a ceramic phase can be improved; in the spraying process, part of particles are insufficiently molten in plasma jet, and when the particles impact a base body, the deformation degree is weakened; and a lap joint porous structure is formed, and the heat insulating performance of the coating can be obviously improved. Through a modification method, Zr4+ is replaced with Y3+ and Ce4+ in a zirconium dioxide lattice, oxygen vacancy and a local stress field are generated, phonon scattering in the lattice is increased, and thermal conductivity is obviously reduced; and the atomic amount of solid solution atoms Ce is much larger than that of Y, the scattering intensity of phonons in the coating can be obviously improved, and the thermal conductivity is reduced. The preparation technology is simple, the surface hardness of the prepared coating is high, bonding between the coating and a metal base body is firm, and the heat insulating effect is good.

The invention relates to a method for preparing single crystal wide-band gradient LED phosphor. The method comprises preparing multiple types of pure-phase nanometer fluorescent powder with the same crystal structure and different compositions through a homogenous precipitation method, adding a dispersant, an adhesive and a fluxing agent into the nanometer fluorescent powder, preparing size-controllable spherical particles with different sizes through a granulation method, preparing spherical nano-aggregates with mesoporous structures through a rapid sintering process, carrying out sintering at a high temperature to obtain size-controllable single-crystal phosphor seed crystals, mixing micron-level phosphor crystals as seeds and the pure-phase nanometer fluorescent materials with the samestructure and different compositions, and orderly carrying out epitaxial growth at a high temperature step by step to obtain wide-band gradient LED phosphor. The wide-band gradient LED phosphor has controllable sizes, good dispersity, complete crystal lattice, high packing density, emission frequency wider than that of general phosphor, large scattering intensity and high luminous efficiency.

The invention discloses an inflaming retarding and oxidation resistance thermal barrier coating. Compared with a traditional thermal barrier, carbon powder is added and modified through high-temperature calcination, and therefore the porosity of a ceramic phase can be improved. In addition, by means of a modification method, Zr4+ is replaced by Y3+ and Ce4+ in a zirconium dioxide crystal lattice, and the oxygen vacancy and the local stress field are produced. The phonon scattering in the crystal lattice is increased, and the thermal conductivity is obviously reduced. The atomic weight of the solid solution atom Ce is far larger than that of Y, the scattering strength of phonons in a product can be obviously improved, and therefore the thermal conductivity is reduced. The preparing technology is simple. The prepared coating is high in surface hardness, low in water absorbing rate, good in tenacity, not prone to cracking, good in interface combining force and even in organization component, and the prepared coating has stable oxidation resistance performance and long service life in the high-temperature using environment.

The invention discloses an anti-thermal-shock thermal barrier coating with low thermal conductivity. Compared with a traditional thermal barrier coating, carbon powder is added, after high temperature calcination modification is conducted, the porosity rate of a ceramic phase can be increased, and the thermal insulating performance of the coating can be significantly improved. In addition, by means of a modification method, Zr<4+> is replaced with Y<3+> and Ce<4+> in zirconium dioxide crystal lattices, oxygen vacancies and local stress fields are produced, the phonon scattering in the crystal lattices is increased, and the thermal conductivity is significantly decreased; the atomic mass of solid solution atoms Ce is far larger than that of Y, the scattering intensity of phonons in the anti-thermal-shock thermal barrier coating can be significantly improved, and therefore the thermal conductivity is decreased. According to the anti-thermal-shock thermal barrier coating with the low thermal conductivity and a preparation method thereof, the preparation technology is simple, the prepared coating is high in surface hardness, low in water absorption, good in toughness, not prone to cracking and layering, high in strain tolerance and long in anti-thermal-shock life, and the service life of the anti-thermal-shock thermal barrier coating with the low thermal conductivity is significantly prolonged compared with a thermal barrier coating of a conventional structure.

The invention provides a device and method for measuring sound scattering intensity of a marine pipeline in shallow sea, and the device comprises a transmitting transducer, a cylindrical frame, a first hydrophone, a special-shaped support, and a second hydrophone, the transmitting transducer is located at the center of the cylindrical frame, the first hydrophone is located at the outer side of the cylindrical frame, the special-shaped support is placed on the surface of the marine pipeline, the second hydrophone is placed on the outer side of the special-shaped bracket; the invention also discloses a device and a method for measuring the sound scattering intensity of the marine pipeline in the shallow sea. According to the device and the method for measuring the sound scattering intensity of the marine pipeline in the shallow sea, the influence of reverberation from the sea surface and the sea bottom in sound scattering signals of the marine pipeline is reduced, low-frequency interference caused by large vortex pulsation of ocean current is weakened, and the device and the method are suitable for measuring the sound scattering intensity of the marine pipeline in ocean current environments such as the shallow sea, the problems of sound beam focusing and alignment of the directional transducer are avoided, and the method has a good engineering application prospect.