165 results about "Crystal" patented technology

A supported graphene device comprises at least one graphene feature of 1 to about 10 graphene layers having a predetermined shape and pattern, with at least a portion of each graphene feature being supported on a substrate. In some embodiments the device comprises graphene features supported on crystalline semiconductor substrate, such as silicon or germanium. The graphene features on a crystalline semiconductor substrate can be fabricated by forming an amorphous carbon doped semiconductor on the crystalline semiconductor substrate and then epitaxially crystallizing the amorphous semiconductor with carbon migration to the surface to form a graphene feature of one or more graphene layers. The epitaxy can be promoted by heating the device or by irradiation with a laser. Methods for fabricating graphene on a variety of substrates, over large areas with controlled thicknesses employ ion implantation or other doping techniques followed by pulsed laser annealing or other annealing techniques that result in solid phase regrowth are presented.

An electronic system includes a three terminal device having a light emitting portion and a magnetically sensitive portion. The magnetically sensitive portion is for modulating light emission from the light emitting portion. The device is a spin valve transistor having a light-emitting quantum well in its collector. The device can convert a magnetic digital signal to both an electrical digital signal and an optical digital signal, wherein either or both of these signals can be provided as a device output. The magnetically sensitive portion of the device is formed of a pair of magnetically permeable layers. When the layers are aligned electron current can pass through with sufficient energy to reach a quantum well where they recombine, generating light. The device may be used to read a magnetic storage medium, such as a disk drive. Or it can be used to provide a display or a memory array composed of single device magnetic write, optical read memory cells. Amplification can be provided to the transistor by adjusting the collector base voltage to provide secondary electrons by impact ionization to provide greater electron current and a correspondingly larger optical emission signal.

A method for growing a crystal of an Al-containing III-V group compound semiconductor by the conventional HVPE method, characterized in that it comprises a step of reacting Al with hydrogen halide at a temperature of 700° C. or lower to form a halide of Al. The method has allowed the suppression of the formation of aluminum chloride (AlCl) or aluminum bromide (AlBr) reacting violently with quartz, which is the material of a reaction vessel for the growth, resulting in the achievement of the vapor phase growth of an Al-containing III-V group compound semiconductor at a rate of 100 microns/hr or more, which has lead to the mass-production of a substrate and a semiconductor element having satisfactory resistance to adverse environment.

A write-once-read-many optical recording medium enabling excellent recording and reproducing properties at a wavelength of blue-laser wavelengths or shorter, i.e. 500 nm or less, particularly at wavelengths of near 405 nm and high density recording. To this end, a write-once-read-many optical recording medium of the invention comprises a recording layer using a material represented by BiOx (0<x<1.5), in which a recorded mark comprises crystal of Bi and/or crystal of a Bi oxide. Another write-once-read-many optical recording medium comprises a recording layer which comprises Bi, oxygen, and M (M represents at least one element selected from Mg, Al, Cr, Mn, Co, Fe, Cu, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Mo, V, Nb, Y, and Ta), in which a recorded mark comprises crystal of the elements contained in the recording layer and crystal of an oxide of the elements.

The invention relates to a cyclic production method of glyphosate, belonging to the technical field of pesticide production techniques. The production method comprises steps as follows: the raw material dimethyl phosphite is subjected to an alkyl ester method to obtain glyphosate and a glyphosate mother solution; the glyphosate mother solution is treated to obtain a secondary alkali mother solution; the secondary alkali mother solution is subjected to catalytic preoxidation, high-temperature high-pressure air electrocatalytic degradation and liquid membrane extraction to obtain a liquid membrane concentrated solution and a saliferous liquid membrane diluted solution; the liquid membrane concentrated solution is subjected to active carbon decoloration, concentration by evaporation, and high temperature polymerization to obtain sodium tripolyphosphate; the saliferous liquid membrane diluted solution is filtered by a nanofiltration membrane to obtain a membrane concentrated solution and a membrane diluted solution; the membrane concentrated solution returns to the catalytic preoxidation step to be recovered; the membrane diluted solution enters an MVR (mechanical vapor recompression) system to be subjected to concentration by evaporation, thereby obtaining sodium chloride crystal, distilled water and a mother solution; and the sodium chloride crystal, distilled water and mother solution are respectively utilized. The invention lowers the production cost, enhances the utilization ratio of the product, reduces the discharge of waste liquor in the glyphosate production procedure, is environment-friendly, and has obvious comprehensive economic benefit and social benefit.

By substantially amorphizing a selectively epitaxially grown silicon layer used for forming a raised drain and source region and a portion of the underlying substrate, or just the surface region of the substrate (prior to growing the silicon overlayer), the number of interface defects located between the grown silicon layer and the initial substrate surface may be significantly reduced. Consequently, deleterious effects such as charge carrier gettering or creating diffusion paths for dopants may be suppressed.

A deformable Al-Mn alloy contains Si (0-0.6%), Fe (0-0.7%), Cu (0-0.3%), Mn (0.3-1.6%), Mg (0-1.3%), Ti (0.005-0.15%), RE (0-0.4%), B (0-0.03%), impurities (0-0.7%) and Al (rest). Its preparing process includes such steps as smelting fine-crystal Al ingot, adding others, smelting Al-Mn alloy, and pressure machining.

The biodegradable drug delivery systems described here are formulated for implantation into the nail unit and its surrounding tissues for the treatment of various nail unit conditions. The systems include non-temperature dependent phase change compositions that may be formulated as solutions, solids, semisolids, microparticles, or crystals.

The present invention relates to an apparatus and method for growing a high melting point single crystal having a predetermined orientation, which is grown from a culture rod (3) by a floating zone method or a suspension zone method. The device comprises: culture rods (3) and crystal nuclei (4), a strip-shaped resistance heating type heating strip (6) provided with at least one opening is installed between its ends and next to it, and it is heated To the crystal melting temperature, so as to form the melting zone (5), drive mechanism (8, 11), so that relative movement occurs between the heating belt (6) and the crystal nucleus (4) and the culture rod (3) that are installed next to the heating belt , the molten liquid material of the culture rod (3) is obtained through each opening of the heating belt, and causes single crystal growth on the crystal nucleus (4) by cooling, and another heating device (15, 16), which is arranged at the melting The vicinity of the zone (5) in order to set the temperature gradient within the range of the melting zone (5). In order to reduce the temperature gradient in the melting zone, said further heating device (15, 16) comprises at least one heating coil (17, 19), which is driven with radio frequency, wherein the heating strip (6) and the respective heating coil are thus mounted opposite each other (17, 19) so that radio frequency radiation is coupled on the heating strip in order to generate an additional inductive heat input in the heating strip and to set a temperature gradient across the melting zone (5). This enables an inductive heat input into the heating strip, which can be varied or varied in a targeted manner.

The invention relates to a control method of inclusions in a thick steel plate used for high heat input welding, which is characterized by adding a deoxidizing agent during steel liquid pouring, wherein the components and adding order of the deoxidizing agent are as follows: Mn and Si, Al, Ti, Ca and Mg; the Mg content is 0.0005-0.007%, when Mg is added for deoxidizing, the oxygen content in steel liquid needs to be adjusted and precisely controlled through adding Fe2O3 powder to a casting ingot mold, and the adding amount of the Fe2O3 powder is such that the oxygen content in the steel liquid is maintained at 0.001-0.008%; the Al content in steel is lower than 0.006%; the ratio of the inclusions with size smaller than 3mu m in the steel liquid is not lower than 80%, and the surface density of the inclusions is not smaller than 300 inclusions/mm<2>; the main components in the center of the inclusions are MgO or MgO and Ti2O3, and the main component on the external surface of the inclusions is MnS. The inclusions formed by using the method provided by the invention can favorably inhibit the growth of austenite crystal in a welding heat-affected zone and promote the growth of intracrystalline ferrite, thus improving the high heat input welding performance of the thick plate.

The invention relates to the technical field of flexible circuit boards, in particular to a halogen-free resin composition. The halogen-free resin composition comprises, by weight, 40-60 parts of polyester-type polyurethane resin, 15-25 parts of polyfunctional epoxy resin, 10-20 parts of phosphorus-containing phenolic resin, 15-25 parts of phosphorus-containing flame retardant and a proper quantity of organic solvent. The polyester-type polyurethane resin contains carboxyl, the acid value is 35 KOHmg/g, and the number-average molecular weight is 10,000-50,000. The polyester-type polyurethane resin containing the carboxyl can be reacted with biphenyl type epoxy resin, and the biphenyl type epoxy resin can be reacted with the phosphorus-containing phenolic resin so that an interpenetrating polymer network structure can be formed. In this way, a cured product has excellent ionic migration resistance and has high flexibility and high heat resistance. The invention further relates to a cover film prepared from the halogen-free resin composition, the excellent ionic migration resistance is achieved, and dendritic crystals can be avoided during ionic migration resistance testing.

The invention provides a vacuum purifying device of high-purity aluminium, belonging to the technical field of casting metallurgy. The vacuum purifying device comprises a furnace case, a melting device, a solidification device, an adiabatic device, an electromagnetic stirring device, a down-drawing mechanism and a fixed bracket, wherein, the electromagnetic stirring device, the melting device and the adiabatic device are sequentially fixed on the fixed bracket from outside to inside; the adiabatic device surrounds the periphery of a crucible; the solidification device is positioned below the melting device and coaxially and fixedly arranged with the melting device; the down-drawing mechanism is arranged at the bottom of the furnace case and is connected with the lower end of the solidification device; and the fixed bracket is fixedly arranged in the furnace case. The maximum growth speed of the crystal of the invention can reach 27cm/h, 4N pure aluminium is purified once, and the average purity of 85% of input materials can reach more than 5N, and the average grain size is below 150 mu m.

The invention discloses a method for producing astaxanthin by inducing Haematococcus pluvialis, which is characterized by comprising the following steps: in the vegetative growth phase, inoculating Haematococcus pluvialis in a nutrient culture medium, and culturing; continuously keeping irradiation on the Haematococcus pluvialis and ensuring that the intensity of illumination arriving at the Haematococcus pluvialis cell surface is 20-200 mu mol.m<-2>.s<-1>; in the induction stage, adding ethanol and seawater crystal into the production culture medium, wherein the ethanol added into the production culture medium accounts for 0.5-3 vol%, and the seawater crystal added into the production culture medium accounts for 0.5-1 wt%; and continuously introducing filtered air mixed with 1-3 vol% carbon dioxide into the production culture medium, wherein 0.2-0.4L/minute of the air is introduced to every 1L of production culture medium. The method can induce the Haematococcus pluvialis to quickly accumulate the astaxanthin, is simple and has the advantages of high yield and favorable effect.

Provided is a method for preparing a two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing. The invention provides a method and experiment device for preparing the periodically-distributed two-dimensional photonic crystal structure with the feature size being the sub-micron dimension in one step in the large area by focusing identical-wavelength double-pulse femtosecond laser on the surface of metal through a plano-convex cylindrical lens, and the identical-wavelength double-pulse femtosecond laser is obtained based on the spectrophotometry of birefringent crystals and has the features of collinear transmission, cross polarization and picosecond time delay. Two-dimensional periodic structure patterns can be effectively regulated and controlled by changing the energy and the number of pulses of input laser, the thicknesses and the azimuth angles of the birefringent crystals and the like. Through the combined design of different linear polarization directions and the variable time delay feature of two femtosecond laser pulses and focusing of the cylindrical lens, preparation of the two-dimensional metallic photonic crystal structure within the large area is achieved conveniently and quickly. The novel preparation method adopting the double-pulse femtosecond laser with cross polarization and variable time delay has potential important applications in the field of material micro-nano processing and preparation.

The invention discloses a method for preparing a self-supporting mono-crystal gallium nitride substrate, comprising the following steps: a layer of masking film is grown on a GaN heteroepitaxal substrate, and a series of growth windows are opened on the masking film, and then a GaN nucleating layer, a GaN template layer and a GaN thick film are sequentially grown, and then the heteroepitaxal substrate is peeled by laser light. The method is a two-step stress relief method: the first step adopts side extension technology, one part of area of a sample is connected with the heteroepitaxal substrate, so as to release partial stress naturally; the second step adopts laser peeling technology to peel the sample from the heteroepitaxal substrate, and then partial stress is released again. The self-supporting mono-crystal gallium nitride substrate prepared by the invention has uniform stress relief and high finished product ratio and is suitable for large-scale industrial production.

The invention relates to a bistable composite film of polymer dispersed liquid crystals and a manufacturing method thereof. The composite film is composed of two pieces of flexible transparent conducting film and a layer of polymer dispersed liquid crystals, wherein, the two pieces of flexible transparent conducting film are etched with a coplanar conversion electrode; the layer of polymer dispersed liquid crystals is highly active polyurethane acrylic ester; the liquid crystals are nematic phase liquid crystal molecules with large birefringence. When imposing a coplanar horizontal electric field, the bistable composite film of the polymer dispersed liquid crystals is in closed and scattering state and still keeps the scattering state after the electric field is eliminated; when imposing a coplanar comb-shaped electrode short-circuit on an opposite electric field, the bistable composite film of the polymer dispersed liquid crystals is in open and transparent state and still keeps the transparent state after the electric field is eliminated. The bistable composite film of the polymer dispersed liquid crystals has the manufacturing method that: after being mixed, the highly active polymer and the nematic phase liquid crystals with the large birefringence are separated to form the structure that the polymer wraps crystal liquid droplets. The invention uses the simple design proposal and depends on changing the direction of the electric field to realize zero field stability of the polymer dispersed liquid crystals so as to further acquire an electronic-paper technology with better energy conservation; or the bistable composite film of polymer dispersed liquid crystals can be specially applied to the fields of building decoration and jewelry counters and so on as a dimming function film which is clipped in glass.

The invention provides a laser wire fusing additive manufacturing titanium alloy component structure refining and isometric crystal converting method. The laser wire fusing additive manufacturing titanium alloy component structure refining and isometric crystal converting method specifically comprises the following steps that an ultrasonic impact micro forging device and a laser wire fusing additive manufacturing device are coupled, and a composite manner that the laser wire fusing additive manufacturing device is arranged in front and the ultrasonic impact micro forging device is arranged onthe back is adopted for synchronous composite manufacturing; according to the workpiece shape, the path is reasonably planned, related parameters of the ultrasonic impact micro forging device and thelaser wire fusing additive manufacturing device are set, effective compatibility is achieved, and the composite manufacturing process is controlled; and according to path planning and system parameters, layer-by-layer ultrasonic impact micro forging treatment is synchronously conducted in the laser wire fusing process till the titanium alloy component additive manufacturing process is finished. The provided method is used for but not limited to the laser wire fusing deposition additive manufacturing technology and can be widely applied to arc wire fusing, plasma arc wire fusing, electronic beam wire fusing and other additive manufacturing technologies.

A making method of a composite type biological chip based on a photonic crystal comprises four steps which are preparation of hard substrates, preparation of photonic crystal thin membranes, connection of membranous substrates and surface treatment of the substrates. (1) the preparation of hard substrates: common hard substrates are cleaned by soapy water, washed by de-ionized water and dried, and amino-group or hydroxyl is decorated on the surfaces of the substrates; (2) the preparation of photonic crystal: the nano-microspheres such as specific monodisperse silicon dioxide or polystyrene and the like, which are different in size according to the positions of testing signals, are assembled on the surfaces of the treated substrates to form the photonic crystal thin membrane with the thickness of 20 to 30 microns (3) the connection of membranous substrates: the surface of the photonic crystal thin membrane is laid with a layer of the membranous substrate and the connection is fixed by utilizing the chemisorption or the mutual function between positive and negative charges; (4) the surface treatment of the substrates: by using the methods such chemisorption and the like, chemical groups which can be fixedly connected with biomolecules to be tested are decorated on the membranous layer parts of the surfaces of the composite substrates which are formed in the step (3).

A nano-class magnetic particle-palygorskite composition, which can be magnetically controlled and used for cleaning raw materials, water, air, sewage, etc and preparing target medicines, is composed of palygorskite crystals and magnetic nanoparticles carried by said palygorskite crystal. It is prepared from palygorskite clay through suspending in water, adding Fe salt solution, hydrolytic reaction, dewatering, washing, and reductive calcining.