53results about How to "No scattering" patented technology

The invention relates to a method for manufacturing a low-cost DFB laser. The semiconductor laser is composed of a lower coating layer, a lower waveguide layer, a active layer, a upper waveguide layer, a upper coating layer and a electrode contact layer, the above items all grow on the InP substrate in a proper sequence, and there are metal electrodes on the substrate and the electrode contact layer, and there is a grating structure on the upper waveguide layer or the lower waveguide layer. Its characters show as follow: the described DFB grating structure is manufactured by via nano-imprint technology. It can be an arbitrary phase shift structure of the grating or arbitrary sampling structure of the grating.

The invention discloses a grower and a growing method of a laser crystal that belongs to YAS series with large size and no core, which belongs to the crystallization technology of the laser crystal. The invention comprises the grower adopting a Mo crucible pulling method heated by resistance and the crystal growing method comprising two procedures and four phases. The laser crystal of YAS series provided by the invention has large size of 35 to 50mm, high concentration (reaching 2.0at percent), no core, no dislocation and no scattering. In addition, the growing technology is stable; growing cycle is short; cost is low; and the yield of the crystal is high with above 85 percent.

The invention discloses a doped pearlescent pigment and a preparation method thereof. The pigment uses a glass flake as a substrate; the surface of the glass flake is coated with a SiO2 or SnO2 coating; the surface of the SiO2 or SnO2 coating is coated with a doped metallic oxide coating; the doped metallic oxide coating is a coating of metallic oxide doped with at least one metallic element compound, nonmetallic element compound or the combination of the two. The glass flake after SiO2 or SnO2 coating treatment is directly coated with the doped metallic oxide coating and then calcined once so as to form the doped pearlescent pigment. The invention relates to the pearlescent pigment containing the doped metallic oxide coating. By doping the metallic oxide with different metallic element compounds and / or nonmetallic compounds, the color and glossiness of the doped pigment are adjusted; therefore, both a high-glossiness colorful twinkling effect and a soft-glossiness effect can be obtained. Moreover, the pearlescent pigment has good hiding rate as well.

The invention relates to the technical field of molecular biology, in particular to adjustable luciferase segmentation fusion protein and a preparing method and application thereof. The fusion protein comprises luciferase N-terminal protein, a flexible peptide fragment 1, MBP protein, an active valve, a flexible peptide fragment 2 and luciferase C-terminal protein, wherein luciferase N-terminal protein and luciferase C-terminal protein form luciferase together, and the active valve is a fragment of 4-8 hydrophobic short-peptide amino acids. By means of the activity adjustment mode that a short-peptide chain amino acid sequence is used as the active valve and specific cleavage enzyme is used as a valve key, a novel fluorescence complementation protein switching mode is realized, and the novel fluorescence complementation protein switching mode can be used for evaluating interaction of other protein dynamics such as combination of a ligand and a substrate, interaction capable of generating a new binding site, protein-protein interaction capable of deactivating protein, and protein-protein interaction capable of changing the specificity of a protein active substrate.

The invention discloses a micro atomic cavity subjected to negative pressure forming, a micro atomic clock chip and a preparation method for the micro atomic cavity and the micro atomic clock chip. The method comprises the following steps of: etching a deep groove to form a silicon die; performing anodic bonding on the silicon die and a borosilicate glass assembled wafer under vacuum to form a sealed cavity; heating the wafer to temperature higher than glass transition temperature, preserving heat, cooling, and performing stress relief annealing on the wafer; putting a substance necessary to an atomic clock into the formed glass micro cavity, pre-bonding the glass micro cavity and a silicon substrate at room temperature in nitrogen atmosphere to seal the glass micro cavity, keeping pressure, and performing anodic bonding to obtain a sealed glass atomic cavity; corroding, and removing the silicon die to obtain a micro atomic cavity with straight vertical sides; preparing heaters on the borosilicate glass assembled wafer at the periphery of the glass micro cavity, and assembling components at the corresponding positions of the borosilicate glass assembled wafer; and preparing pins, and connecting the pins, a power supply and a processing circuit. The method is simple and low in cost.

The invention provides a three-dimensional display system. The display system comprises orientation backlight, multilayer liquid crystal sheets, a horizontal direction diffuser, a vertical direction diffuser and a raster. The orientation backlight is used for emitting light. A first layer of liquid crystal sheet, the horizontal direction diffuser, the other layers of liquid crystal sheets except for the first layer of liquid crystal sheet, the raster and the vertical direction diffuser are successively arranged along a light propagation direction. By using the three-dimensional display system,the light emitted by the orientation backlight generates an orientation light cluster through a combined effect of the liquid crystal sheets and the diffusers, and the light is ensured to fall on anassigned viewpoint so that double images and fuzzy images are not generated. The orientation light cluster can form a correct watch vision area, the vision area is not changed and parallax inversion is not generated. Each pixel can emit a plurality of different light to different directions, a display visual angle is enlarged and a display resolution is greatly increased.

The invention relates to a method for preparing a stable nano anatase titanium dioxide alcohol phase sol, which belongs to a preparation method of a semiconductor photoelectric material. The invention provides a simple method for preparing a nano anatase titanium dioxide nano nanocrystalline alcohol phase sol at low temperature by using a one-step method, and the raw materials comprise a titanium-containing organic matter, an organic solvent, distilled water or deionized water, a dispersant, a hydrolysis inhibitor and a catalyst with a corresponding mol ratio of 1:(20-100):(0.5-3):(1-5):(0.1-3):(0.01-1.5). According to the invention, the titanium organic matter is added in an alcoholic solution mixed with the dispersant and the catalyst, the hydrolysis inhibitor and the water are added, the materials are stirred for 3-48 hours under normal pressure and at the temperature of 25-100 DEG C, a pH value of a reactant is controlled to 1-5, and the transparent stable nano anatase titanium dioxide alcohol phase sol can be obtained. A hydrolysis intermediate product can be removed by using a dialysis technology finally. The sol has the advantages of good sol crystallinity, stability and transmittance performance, and concentration of the sol can be diluted by alcohol according to requirement. The prepared sol enables direct film forming on various high temperature-resistant or high-temperature-intolerant material substrates, and also can be used for directly preparing photocatalytic aqueous environmentally-friendly coatings or visible light-excited photocatalytic environmentally-friendly coatings.

The invention relates to an aluminum oxide-gallium oxide mixed-crystal material for wide-band-gap semiconductors and a preparation method therefor. The structural formula of the aluminum oxide-gallium oxide mixed-crystal material is Ga(2-2x)Al2xO3, wherein the mole ratio x of doped aluminum oxide is 0-50%. According to the aluminum oxide-gallium oxide mixed-crystal material for the wide-band-gap semiconductors and the preparation method therefor, a mixed crystal is formed in a manner of maintaining the original gallium oxide crystal structure, has very high optical quality, is free of defects such as cracking, scattering particles and bubbles and is uniform in color; and through doping, the ultraviolet absorption cutoff edge of the ultraviolet absorption cutoff edge extends to 210-255nm, so that the aluminum oxide-gallium oxide mixed-crystal material is a very excellent deep-ultraviolet substrate material.

The invention discloses a composition and preparation method of scintillation glass used for preparation of a scintillation fiber-optic faceplate. The composition comprises, by weight, 10 to 20% of SiO2, 0 to 10% of Al2O3, 20 to 45% of B2O3, 30 to 60% of La2O3, 0 to 2% of Nb2O5, 5 to 25% of Gd2O3, 0 to 4% of Lu2O3, 0 to 5% of BaO, 0 to 2% of SnO and 0 to 5% of ZnO. The invention also provides the preparation method for the scintillation glass used for preparation of the scintillation fiber-optic faceplate. The method comprises the following steps: (1) weighing the raw materials according to the above-mentioned weight percentages, mixing all the raw materials, and grinding the raw materials until the raw materials are uniform so as to obtain a batch; (2) pouring the batch into a crucible and fusing the batch so as to prepare a glass melt; (3) casting the glass melt on a preheated heat-resistant steel die, maintaining the temperature of the die in a muffle furnace and then carrying out cooling and annealing; and (4) carrying out cutting, surface grinding and polishing so as to obtain the scintillation glass. The prepared scintillation glass has the advantages of good chemical stability, high scintillation light luminescence efficiency and capacity of realizing fiber drawing.

The invention relates to a gallium nitride-based transistor with high electron mobility. The gallium nitride-based transistor comprises a substrate, a GaN (gallium nitride) buffer layer, a channel layer, a barrier layer, and a source electrode, a drain electrode and a grid electrode on the barrier layer, a charge compensation layer between the grid electrode and the drain electrode, and a metal electrode and an insulating medium on the charge compensation layer from the bottom up in sequence; the gallium nitride-based transistor is characterized in that the channel layer, the barrier layer and the charge compensation layer are all made from the GaN material; the channel layer and the barrier layer are opposite in the direction of polarization; and the barrier layer and the charge compensation layer are opposite in the direction of polarization. Due to the polarized charge imbalance between the channel layer and the barrier layer, and between the barrier layer and the charge compensation layer, charges of the same quantity and opposite types are generated, and a charge automatically-balanced super-junction structure is formed; the problems of low reliability and low output power and the like caused by the reason that AlGaN and other materials are adopted for the barrier layer are solved; and meanwhile, the problem of charge imbalance of the existing super-junction GaN electric appliance is solved as well, so that that the performance of the device is improved.

Provided is a solid electrolytic capacitor and manufacturing method thereof which facilitates an assembly work with simple construction to lead to a reduction of cost, realizes excellent equivalent series resistance characteristics and makes a thin configuration possible. With the solid electrolytic capacitor of the present invention, a cathode lead frame has a connecting member to connect integrally with a cathode member of a capacitor element stack body on the side surface of a capacitor element extending in the thickness direction thereof. Capacitor elements, each provided with a through hole on an anode member, are stacked on top of each other in layers and connections between capacitor elements are achieved by disposing an anode lead frame between layers. Accordingly, when a plurality of anode members are joined to the anode lead frame via a through hole provided on respective anode members of capacitor elements, stabilized welding work is allowed to be performed without any of molten aluminum foil to be released outside.

An optical recording material and methods of making such material is provided. The material comprises of a dewar benzene monomer, with at least two cross-linkable groups, a sensitizer, a cross-linker, and an initiator. The material does not require a binder or a co-sensitizer. The material can be fabricated by an exceedingly easy technique that offers high photosensitivity, high diffraction efficiency, millimeter thickness, and high dynamic range.

The invention provides a polydopamine multi-level nano-drug carrier, and a preparation method and an application thereof. The preparation method comprises the following steps: S1, uniformly mixing ethanol, ultrapure water and ammonia water, then adding a dopamine hydrochloride solution, carrying out stirring at a room temperature for 25-35 h, and centrifugally collecting precipitates so as to obtain PDA microspheres with a particle size of about 120-350 nm; S2, dissolving the PDA microspheres prepared in the step S1 into ethanol, then adding ferric acetylacetonate and polyol, raising the temperature of the solution to 65-75 DEG C under a vacuum condition, keeping the temperature for 15-30 min so as to remove the ethanol, introducing nitrogen, carrying out heating to 200-220 DEG C, carryingout stirring for 2 h, continuing heating to 280-290 DEG C, carrying out stirring for 50-70 min, carrying out cooling to a room temperature, adding isopyknic acetone, carrying out separating with a magnet, and carrying out washing with ethanol so as to obtain PDA@IOs microspheres; and S3, dispersing the PDA@IOs microspheres obtained in the step S3 into a Tris-HCl buffer solution with a pH value of8-9, and carrying out stirring for 22-26 h so as to obtain the polydopamine multi-level nano-drug carrier, namely PDA@IOs@PDA nanometer microspheres. The nanometer microspheres have metal affinity, good magnetic response and high photo-thermal conversion efficiency.

The invention relates to an LED illuminating device and a preparation method thereof. The device is characterized by comprising an LED apparatus, an LED circuit board, a heat dissipator and a power supply controller. The LED apparatus is arranged on the LED circuit board, the LED circuit board is arranged above the heat dissipator, and the power supply controller is connected to the LED circuit board through a wire. The LED illuminating device can emit approximate natural light.

The invention discloses a large-caliber laser quartz rod with the caliber of more than 320mm. The large-caliber laser quartz rod is prepared from basic weight parts of raw material of high-purity quartz sand and 2.9 to 3.3 weight parts of microelement additive, wherein the microelement additive consists of the following components in part by weight: 0.3 to 0.5 part of um oxide, 0.1 to 0.3 part oferbium oxide, 0.4 to 0.6 part of neodymium oxide, 0.2 to 0.4 part of potassium carbonate, and 0.1 to 0.3 part of alpha-alumina. The large-caliber laser quartz rod drawn by a whole rod doping preparation process has the caliber of 320mm, is not required to be coated with a film, has good optical uniformity, high transparency, no core, no scattering and no malposition, has the transmittance of 99.8percent, the finish of more than or equal to 60-40, the laser wavelength of 1.06mu m and the doping concentration error of + / -0.05 percent.

The invention discloses a method for drawing a major-diameter optical fiber preform by a continuous smelting furnace. The method comprises the steps that high-purity quartz sand is prepared firstly; raw silica is subjected to water washing, crushing, pickling, roasting, water quenching, drying, smashing, iron removal, sorting and floatation sequentially; the quartz sand is put into a reaction kettle; mixed acid is added, and reacts for over 24h while rotation is performed; the high-purity quartz sand in the reaction kettle is taken out and dried for standby application; a core bar in the continuous smelting furnace is dismounted; a forming device is arranged below a material platform outlet at the bottom of a tungsten crucible, wherein the forming device comprises a stand pipe butted with the material platform outlet; a horn-mouth-shaped opening protector is arranged at the lower end of the stand pipe; a smooth necking section is arranged at the bottom of a material platform, and butted with an upper port of the stand pipe; a computer system and a laser diameter measurement system are combined for control; and the satisfactory major-diameter optical fiber preform is drawn. According to the method, a finished product rate of the major-diameter high-purity optical fiber preform is greater than or equal to 90%, a hydroxyl value is less than or equal to 1ppm, and the content of SiO2 reaches 99.9999%.

The present invention discloses a processing method for a strip Fresnel lens. The method comprises the following steps: plasticizing resin; adding the plasticized material into a calender to carry out calendering into sheets; rolling the calendered sheets by a Fresnel insection roller and a smooth roller to press out Fresnel insection, and synchronously cooling; eliminate internal stress; after cooling, relaxed placing the Fresnel hard sheets to eliminate the internal stress; cutting and packaging. According to the present invention, the heating roller, the treatments of heating and calendaring are adopted, the Fresnel insection roller is adopted to carry out extruding and forming, the threading method is adopted to cool and shape the front side and the back side of the hardware; the process of the invention has characteristics of simpleness, rapidness and high yield, wherein the yield of the present invention is increased by thousands of times compared to the yield produced by the original molding method; the cost is substantially reduced, wherein the cost can be reduced by hundreds of times; the quality precision, ie., the cusp angle of the refraction angle of the Fresnel lens, is ensured, such that the case of the scattering is not generated; the finish can achieve more than 10.

A quantum tailoring photovoltaic module. It is mainly to solve the problem of low efficiency of existing photovoltaic modules. The packaging film contains rare earth elements with quantum tailoring effect, such as adding BaF2, rhenium Re3+, ytterbium Yb3+ ions, etc. to the EVA film, which can improve the photoelectric conversion efficiency of the cell. Mainly used for solar cell power generation.

The invention relates to an optical measurement device (10) for measuring an optical appearance of a surface (16) of a sample (18), in particular the surface (16) of a human skin, comprising a measuring head (30) which can be brought into contact with the surface (16) of the sample (18), the measuring head (30) comprising: an illumination device (12, 46) for illuminating the surface (16) with an illumination beam (14); a detection device (23) for detecting a response beam (20), wherein the response beam (20) is the response of the sample (18) to the illumination beam (14). The detection device (23) comprises a screen (22, 52) for intercepting the response beam (20), wherein the screen (22, 52) extends approximately a quarter hemisphere in order to realize measuring head (30) with a small contact area with the surface.

The invention relates to an invisible high beam. The invisible high beam structurally comprises a shell, three single-primary-color light source systems and a three-primary-color light source driving circuit, and the three single-primary-color light source systems and the three-primary-color light source driving circuit are mounted in the shell. Three columnar containing bins arranged in the axial direction are formed in the shell and used for mounting the single-primary-color light source systems, and the cross sections of the three columnar containing bins are distributed in a triangle mode. The three-primary-color light source driving circuit is electrically connected with the three single-primary-color light source systems and used for driving the three single-primary-color light source systems to emit three-primary-color light. The invisible high beam can emit three-primary-color light which is illuminated onto a visible target and combined into visible warm white light. The invisible high beam has the characteristics of long illumination distance, no scattering, no glare, no dazzle and the like, has the using effect of light source invisibility, can be applied to extensive application occasions such as automobile light beams, high-pole lamps, search light. Medical surgery illuminating lamps and high-beam flashlights and has wide application prospects.

The invention discloses rapidly-molded microwave dielectric ceramic and a preparation method thereof. A biological molecular material, a plasticizer and de-ionized water are mixed to obtain a crosslinking framework for gel casting; the biological molecular material and the plasticizer can form a hydrogen bond in a solution; the hydrogen bond is used as the plasticizer to improve the strength of agreen body; independently mixing ceramic powder and the residual de-ionized water, and a condition that the ceramic powder is directly mixed with the crosslinking framework for the gel casting to generate an adhering phenomenon is avoided, so that the ceramic powder can be sufficiently and uniformly mixed with the crosslinking framework; finally, ceramic is rapidly formed at certain temperature through adhering and sintering, the sample preparation time is greatly shortened and defects caused by the fact that organic matters are not adhered completely are avoided at the same time, so that themicrowave dielectric ceramic with good performance can be obtained; compared with a sample prepared by utilizing a traditional solid-phase method utilizing the same powder, a microwave dielectric ceramic sample prepared by the method has better performance; the dielectric loss is reduced by 26.01 percent, the Q-unloaded is improved by 35.6 percent and the QF (Quality Factor) value is improved by 76.85 percent.

The invention discloses an exposure development method for a circuit board and solves problems of deficient exposure, poor graph precision and poor graph uniformity existing during groove bottom graph exposure in the prior art. The method comprises steps that, a circuit board having a step groove is provided; a pad is made, the size of the pad is in matching with the step groove, and the pad is provided with a hollowed-out graph identical to a design graph of the bottom of the step groove; the circuit board is coated with a photosensitive material, and the photosensitive material covers the bottom of the step groove; the pad is arranged in the step groove, exposure of the circuit board is carried out, and exposure of the photosensitive material coated at the bottom of the step groove is realized through the hollowed-out graph; the pad is taken out, development of the photosensitive material on the circuit board is carried out, and the required graph is formed on the circuit board.

The invention discloses an optical system and a head-mounted display device. The optical system comprises a first lens which is provided with a first surface and a second surface which are oppositely arranged, the first lens comprises a light coupling-in end face, and the light coupling-in end face is connected to the first surface and the second surface; a polarization reflector is arranged on the side, away from the light coupling-in end face, of the first lens; a light splitting lens is arranged on one side of the second surface of the first lens; the second lens is arranged between the light splitting lens and the first lens; a phase retarder is arranged on the light splitting lens or the second lens, the second lens comprises a main body part and an extension part, the main body part is arranged corresponding to the middle area of the light splitting lens, the extension part extends from the main body part to an outer edge of the light splitting lens, and an outer edge of the extension part is aligned with the outer edge of the light splitting lens. According to the optical system, generation of gaps can be avoided, and the imaging effect of the head-mounted display device is ensured.

The invention discloses a method for designing a surface plasmon polariton wave absorber, which comprises the following steps of: generating an SPP signal by adopting a Vivaldi gradually-changed slot, coupling the SPP signal to a comb-shaped intrinsic structure through a coplanar waveguide (CPW) feed structure, transmitting the SPP signal along the comb-shaped intrinsic structure, and receiving the SPP signal at a receiving end by adopting the Vivaldi gradually-changed slot. Indium tin oxide (ITO) is adopted as a basic structure of an SPP absorption unit, the wave vector of the SPP absorption unit is matched with the wave vector of an SPP signal by regulating and controlling dispersion characteristics and impedance characteristics, and the SPP absorption unit is matched with the impedance of the SPP signal; The invention is used for absorbing SPP signals in the transmission process. A broadband SPP signal is generated by adopting an SPP excitation and receiver, an SPP wave-absorbing structure is designed by adopting an indium tin oxide (ITO) structural unit, the transmission wave vector of the wave-absorbing structure is improved by adjusting the geometric dimension of ITO, so that the excited SPP signal can be stably transmitted without scattering, wave impedance matching is realized by changing the conductivity parameter of the ITO structure, and the SPP wave-absorbing structure can be applied to the field of microwave sensing. Therefore, perfect absorption of the SPP signal is realized.

The present invention relates to the technical field of molecular biology, in particular to an adjustable luciferase segmented fusion protein, its preparation method and application. The fusion protein includes luciferase N-terminal protein, flexible peptide segment 1, MBP protein, Active valve, flexible peptide segment 2 and luciferase C-terminal protein; wherein, the luciferase N-terminal protein and luciferase C-terminal protein together form luciferase; the active valve is a section of 4-8 hydrophobic short Peptide Amino Acids. Through the short peptide chain amino acid sequence as the "active valve" and the specific cleavage enzyme as the "valve key", a new type of fluorescent complementary protein switching mode is realized, which can be used to evaluate the dynamic interaction of other proteins such as ligands Binding to a substrate, interactions that create new binding sites, protein-protein interactions that deactivate proteins, protein-protein interactions that alter the substrate specificity of a protein.

The purpose of the present invention is to provide a structure of a thermal-response switch using a bimetal piece, which is capable of preventing the scattering of melted metal when incorporating the bimetal piece into the housing and laser-welding it on a fixed terminal and of incorporating the bimetal piece with high precision. To solve the problem, the thermal switch has a housing with a bottom, a fixed contact arranged on the inner bottom face of the housing and a flip part capable of flipping according to the temperature, and comprises the bimetal piece with a movable contact, which contacts and separates from the fixed contact, fixed at one end thereof, and a fixed terminal arranged on the inner bottom of the housing with the other end of the bimetal piece overlapped and fixed thereon in a cantilever. An opening, through which a laser beam can be emitted from the outer bottom of the housing, is formed on the bottom of the housing to match the overlapped position between the fixed terminal and the bimetal piece.

The invention discloses a levo-oxiracetam freeze-dried powder for injection. The freeze-dried powder contains the following raw and auxiliary materials by mass: 1 part of levo-oxiracetam, 0.4-0.6 partof methionine, 0.5-0.9 part of lactose, 0.2-0.4 part of triethanolamine, 0.01-0.02 part of Tween 80, and 0.01-0.03 part of phenol. The invention utilizes specific excipient combination and freeze-drying curve, the sublimation temperature of a secondary drying stage is raised, the preparation production cycle is shortened, powder scattering phenomenon does not occur, the content and other indicators all meet the requirements, the product has good clarity that is lower than a 0.5# standard turbidity solution, also has strong antibacterial properties, and is qualified in aseptic inspection.

The present invention relates to a car headlight comprising a light emitting unit for producing the function of a main light, the light emitting unit is composed of a light source and a lens, the lens projects the light emitted by the light source distributed as a main light in the state where the light emitting unit is installed in the car into the area in front of the car as the main light distribution; and include an auxiliary lighting unit designed to produce an auxiliary lighting distribution, the auxiliary lighting unit is arranged so that the lighting of the auxiliary lighting unit during the operation of the auxiliary lighting unit or It is said that the area emitting light is arranged optically close to the lens of the light emitting unit of the main light. According to the invention, the lens of the main light emitting unit has an antireflection coating at least partially on its light incident surface, and / or the lens of the main light emitting unit has an antireflective coating at least partially on its light exit surface, and The auxiliary lighting unit is switched on during lamp operation.