55 results about "Crystal properties" patented technology

The invention is related to nuclear physics, medicine and oil industry, namely to the measurement of x-ray, gamma and alpha radiation; control for trans uranium nuclides in the habitat of a man; non destructive control for the structure of heavy bodies; three dimensional positron-electron computer tomography, etc.The essence of the invention is in additional ingredients in a chemical composition of a scintillating material based on crystals of oxyorthosilicates, including cerium Ce and crystallized in a structural type Lu2SiO5.The result of the invention is the increase of the light output of the luminescence, decrease of the time of luminescence of the ions Ce3+, increase of the reproducibility of grown crystals properties, decrease of the cost of the source melting stock for growing scintillator crystals, containing a large amount of Lu2O3, the raise of the effectiveness of the introduction of SCintillating crystal luminescent radiation into a glass waveguide fibre, prevention of cracking of crystals during the production of elements, creation of waveguide properties in scintillating elements, exclusion of expensive mechanical polishing of their lateral surface.

Semiconductor light-emitting devices are provided. The semiconductor light-emitting devices include a substrate and a crystal layer selectively grown thereon at least a portion of the crystal layer is oriented along a plane that slants to or diagonally intersect a principal plane of orientation associated with the substrate thereby for example, enhancing crystal properties, preventing threading dislocations, and facilitating device miniaturization and separation during manufacturing and use thereof.

The present invention comprises a stent forming a plurality of meandering elements comprising a blend formed from a polymer. The polymer comprises poly-L-lactide, poly-D-lactide or mixtures thereof and a copolymer moiety comprising poly-L-lactide or poly-D-lactide linked with ε-caprolactone or trimethylcarbonate. The poly-L-lactide or poly-D-lactide sequence in the copolymer moiety is random with respect to the distribution of ε-caprolactone or trimethylcarbonate and the copolymer moiety molecular weight ranges from about 1.2 IV to about 4.8 IV. The meandering elements may be stretched to a modulus ranging from about 250000 PSI to about 550,000 PSI, one segment of the meandering element has a decreased cross-sectional area and may have a wide-angle X-ray scattering (WAXS) 2θ values of ranging from about 1 to about 35. In various embodiment, two, three or n segments of the meandering element have a decreased cross-sectional area and may also have a wide-angle X-ray scattering (WAXS) 2θ values of ranging from about 1 to about 35 after stretching. In another embodiment, all segments of the meandering element have a decreased cross-sectional area and may also have a wide-angle X-ray scattering (WAXS) 2θ values of ranging from about 1 to about 35 after stretching. The meandering element may comprise a helical winding, a circumferential winding or stent ringlet. The properties of the bioabsorbable polymers allow for both crimping and expansion of the stent. The crystal properties of the bioabsorbable polymers may change during crimping and / or expansion allowing for improved mechanical properties such as tensile strength and slower degradation kinetics.

An enclosure that maintains the environment of one or more optical crystals and allows efficient frequency conversion for light at wavelengths at or below 400 nm with minimal stress being placed on the crystals in the presence of varying temperatures. Efficient conversion may include multiple crystals of the same or different materials. Multiple frequency conversion steps may also be employed within a single enclosure. Materials that have been processed specifically to provide increased lifetimes, stability, and damage thresholds over designs previously available are employed. The enclosure allows pre-exposure processing of the crystal(s) such as baking at high temperatures and allowing real time measurement of crystal properties.

An enclosure that maintains the environment of one or more optical crystals and allows efficient frequency conversion for light at wavelengths at or below 400 nm with minimal stress being placed on the crystals in the presence of varying temperatures. Efficient conversion may include multiple crystals of the same or different materials. Multiple frequency conversion steps may also be employed within a single enclosure. Materials that have been processed specifically to provide increased lifetimes, stability, and damage thresholds over designs previously available are employed. The enclosure allows pre-exposure processing of the crystal(s) such as baking at high temperatures and allowing real time measurement of crystal properties.

The bioabsorbable polymers and compositions of the present invention may be formed into medical devices such as stents that can be crimped onto a catheter system for delivery into a blood vessel. The properties of the bioabsorbable polymers allow for both crimping and expansion of the stent. The crystal properties of the bioabsorbable polymers may change during crimping and / or expansion allowing for improved mechanical properties such as tensile strength and slower degradation kinetics. Typically, bioabsorbable polymers comprise aliphatic polyesters based on lactide backbone such as poly L-lactide, poly D-lactide, poly D,L-lactide, mesolactide, glycolides, lactones, as homopolymers or copolymers, as well as formed in copolymer moieties with co-monomers such as, trimethylene carbonate (TMC) or ε-caprolactone (ECL).

The invention provides a growth device of an infrared crystal of polynary compounds and comprises a stove, a hearth box inside the stove comprises three temperature regions of an upper high-temperature region, a middle gradient region and a lower low-temperature region from up to down, a heater with standalone temperature control is respectively arranged inside the upper high-temperature region and the lower low-temperature region, a thermocouple with temperature control is respectively positioned inside the upper high-temperature region and the lower low-temperature region, and the middle gradient region is a heat-insulating and fireproof layer with ventholes; a loading rod that is used for loading a crucible pot of crystal growth is arranged inside the hearth box, a lower end of the loading rod is connected with a rotary clamping head that is connected with an electric motor, and the electric motor is arranged on a spiral travel mechanism. The growth device can obtain temperature fields that are suitable for crystal growth according to the growth habits of different infrared crystals of polynary compounds, maintains the stability of a solid-liquid interface and realizes the crystal growth in the planar interface. By using the growth device and adopting the Bridgman method, the infrared crystal of polynary compounds with complete appearance and well crystal property can be prepared.

Disclosed herein is a process for production of a nitride semiconductor device having good characteristic properties (such as light-emitting performance). The process does not thermally deteriorate the active layer while nitride semiconductor layers are being grown on the active layer. The process consists of forming an active layer on a substrate by vapor phase growth at a first growth temperature, and subsequently forming thereon one or more nitride semiconductor layers at a temperature which is lower than said first growth temperature plus 250° C. The process yields a nitride semiconductor device in which the active layer retains its good crystal properties, without nitrogen voids and metallic indium occurring therein due to breakage of In—N bonds.

A process is provided which employs reactive controlled crystallization to produce drug substance having desirable crystal properties which process involves providing reactants A and B in liquid or solution form and adding reactant B to reactant A using a cubic or incremental addition technique to control extent of reaction and thus crystallization kinetics, including supersaturation and nucleation, to produce crystals of drug substance which are generally larger, better quality and with few fines and narrow particle size distribution than normally obtainable employing prior art crystallization techniques. In addition, crystals of drug substance produced by the above process is also provided.

A nonlinear optical conversion device includes a nonlinear crystal having entrance and exit surfaces allowing input and output laser beams to propagate in the phase-matching plane for a desired nonlinear generation process. The nonlinear generation process involves a nonlinear interaction in the nonlinear crystal and resultant conversion of power in one or two input beams into power in the output beam. The nonlinear crystal is characterized by absorption and resultant modification of the crystal properties by the power in the output beam, the modification with the potential for reducing the efficiency of the nonlinear process in the crystal, and the nonlinear process involving critical phase-matching in the nonlinear crystal in which the powers in the output beam and input beam or beams propagate in different directions through the process of Poynting vector walk-off. The input beam or beams are of a sufficiently small beam dimension in the phase-matching plane.

The invention provides a growth method of an infrared crystal of polynary compounds, which takes crystal powder of polynary compounds as a raw material and a crucible pot as a growth container, and comprises following technical processes: (1) metallic ions and organic impurities that are adhesive to a wall of a quartz pipe are removed, and impurities on an inner wall of the crucible pot are removed; (2) the crystal powder of polynary compounds is filled into the crucible pot, the crucible pot is vacuumized, and the quartz pipe is sealed with oxyhydrogen flame; (3) the crucible pot is positioned inside a high-temperature region, temperature of the high-temperature region is raised over the melting point of the crystal of polynary compounds, temperature of a low-temperature region is raised under the melting point of the crystal of polynary compounds, and heat preservation is implemented after certain objective temperature is reached; lowering of a pointed part of the crucible pot is stopped at a position of a solid-liquid interface, the crucible pot is lowered after the heat preservation, and the crystal starts to grow; crystal growth finishes after all fusants in the crucible pot pass through the solid-liquid interface in a middle gradient region; (4) the crucible pot is lowered to the lower low-temperature region so as to implement annealing, and the crystal is taken out after room temperature is reached. The growth method can be used for preparing the infrared crystal of polynary compounds with complete appearance and well crystal property.

The present invention discloses a stent comprising a blend formed from a polymer. The polymer comprises poly-L-lactide, poly-D-lactide or mixtures thereof and a copolymer moiety comprising poly-L-lactide or poly-D-lactide linked with epsilon-caprolactone or trimethylcarbonate. The poly-L-lactide or poly-D-lactide sequence in the copolymer moiety is random with respect to the distribution of epsilon-caprolactone or trimethylcarbonate and the copolymer moiety molecular weight ranges from about 1.2 IV to about 4.8 IV. The polymere blend may have a wide-angle X-ray scattering (W AXS) 2-theta values of ranging from about 1 to about 35. The properties of the bioabsorbable polymers allow for both crimping and expansion of the stent. The crystal properties of the bioabsorbable polymers may change during crimping and / or expansion allowing for improved mechanical properties such as tensile strength and slower degradation kinetics.

A preparation method for a rutile nano-rod array film adopts the hydro-thermal synthesis technique and is prepared in water soluble ionic liquid. The preparation method has the following steps: (1) dissolving soluble titanium source in hydrochloric acid aqueous solution, then adding imidazole salt-typed ionic liquid to obtain mixing solution; (2) leading a uropatagia in a inoculating seed in a way of the uropatagia dipping Degussa P25 suspended solution and then carrying out annealing treatment; (3) immerging the uropatagia led in the inoculating seed into the mixing solution to carry out hydro-thermal synthesis reaction; (4) taking out the uropatagia and washing the uropatagia to be neutral, and obtaining a single layer film of rutile nano-rod array in dispersive arrangement after drying the uropatagia. The invention has the advantages of simple method, low cost, good crystal property, large length-diameter ratio and even distribution of diameter size of the nano-rods and high specific surface. The dispersed spaces between rods can be effectively filled with a plurality of substances and the rutile nano-rod array film prepared by the preparation method can be widely used in the fields of dye-sensitized solar cell electrodes, oxygen sensors, etc.

The invention discloses an infrared induction switching zoom lens and an imaging monitoring method thereof. The lens includes a mechanically connected infrared filter, a switching device, and a focusing lens group; in the visible light mode, the infrared filter is moved into the optical system of the lens through the switching device , used to block infrared light; in the infrared light mode, the infrared filter moves out of the optical system of the lens through the switching device; the focusing lens group is associated with the infrared filter, and is used to correct the optical system for focus shift. Due to the use of the focusing lens group to switch the optical system where the focal point shifts, only one infrared filter can be used to switch between the visible light mode and the infrared light mode, thereby avoiding the problem caused by the characteristics of crystal and other materials. The infrared transmittance of the optical system in night vision is only 90%, which improves the infrared light transmittance of the optical system at night; increases the brightness of the imaging monitoring screen, reduces image noise, and makes the screen clearer and cleaner.

The invention discloses a preparation method of submicron-scale barium titanate powder, wherein the preparation method includes the steps of 1) employing metatitanic acid being more than 98.5% in purity and less than 80 nm in particle size; 2) performing high-effective grinding to the metatitanic acid with barium carbonate to disperse the powder until specific surface is 50-150 m<2> / g, wherein the ratio of barium to titanium is 0.998-1.002, and calcining the powder to prepare barium titanate powder; and 3) synthesizing the barium titanate powder through a quick thin-layer calcination method. The calcination method is mainly used for controlling the mass of material in unit area, wherein the unit area mass is less than 1 g / cm<2>, temperature increasing rate of calcination is 6-55 DEG C / min, calcination temperature is 900-1050 DEG C and temperature maintaining time is 1-3 h. The barium titanate powder has uniform particles and good dispersibility, is 120-300 nm in average particle size, has a high tetragonal crystal property, and is more than 1.009 in c axis / a axis value through X-ray diffraction analysis.

The invention relates to the technical field of semiconductor material preparation, and in particular, relates to a gallium arsenide-doped single crystal growth process; oxygen released in the environment and in the high-temperature process of arsenic, gallium and a quartz tube is absorbed by adding materials with high oxygen reaction activity in two links of polycrystalline synthesis and single crystal growth, and oxygen pairs are preventd from entering polycrystals and single crystals, so the influence of oxygen pollution on the material performance is greatly reduced. Si doping is carried out in the polycrystalline synthesis process, silicon enters gallium arsenide and performs effective occupying, boron oxide does not exist, and polycrystalline synthesis does not cause B to pollute polycrystalline. C, Al or Ti is placed in a quartz tube to absorb oxygen in the quartz tube in the single crystal growth process, the oxygen content in the single crystal is controlled, and polycrystalline doped impurities are not added any more. During single crystal growth, boron oxide is added to improve the single crystal rate and realize selective adsorption of impurities. The desired crystal properties are achieved.

The invention relates to the technical field of crystal growth, in particular to a calcium fluoride crystal containing europium, a preparation method and application. The calcium fluoride crystal containing europium, provided by the invention, can be irradiate with Co60; the light yield of the crystal is measured with an RCA8850 photomultiplier; the result shows that the calcium fluoride crystal containing europium, provided by the invention, has the excellent scintillating crystal property of emitting twinkling fluorescent light of a certain wave length after absorbing the energy of high-energy particles on the condition that the content of the crystal is low. Especially, the relative light output of the crystal is equal to that of an LYSO scintillating crystal. Besides, as the content is low, the calcium fluoride crystal containing europium is beneficial to growth of high optical mass crystals. The invention further provides the preparation method and the application of the calcium fluoride crystal containing europium.

The invention discloses a method and a device for testing diffraction performance of a self-reference acousto-optic tunable filter. The device comprises a wave length tunable laser, a neutral-density filter, a Glan prism, a two-dimensional electric rotary platform and an energy meter and is used for testing performance including diffraction efficiency of the acousto-optic tunable filter. The method is based on crystal properties of the AOTF, self reference is achieved by means of zero-grade light and diffraction light generated after driving, with combination of the method of alternative testing performed by probes of the energy meter, influence on measurement accuracy caused by instability of optical energy and inconsistent response of the probes of the energy meter can be eliminated effectively, an optical path is simple, the method is easy to operate, and the wide-band high-accuracy performance test can be achieved.

An apparatus and a method for testing laser frequency doubling crystal properties. The apparatus includes, in a successively arranging manner, a laser source, an incident laser path, an object supporting bench, a secondary harmonic laser path, a pinhole, an incident light color filter and a photoelectric multiplier tube. During test, a laser frequency doubling crystal is irradiated by laser by a property that the laser frequency doubling crystal can frequency-multiplying an incident laser to generate secondary harmonic of the incident laser. An emitted secondary harmonic is received by the photoelectric multiplier tube to obtain light intensity of the secondary harmonic. By means of the apparatus for irradiating different zones in the laser frequency doubling crystal, secondary harmonic intensities in the different zones are obtained. By analyzing the secondary harmonic intensities in the different zones, determination of structure and properties of the laser frequency doubling crystal is carried out. The apparatus and the method can analyze the internal structure of the laser frequency doubling crystal without damage of the laser frequency doubling crystal, thereby achieving non-destructive detection of quality of the laser frequency doubling crystal.

Systems and methods for crystallization in microfluidic systems are generally described. Many applications require the collection of time-resolved data to determine advantageous conditions for crystallization. The present invention provides tools and related techniques which address this need, as well as a platform for the growth of crystals within microfluidic channels. The systems and methods described herein provide, in one aspect, tools that allow for controlled, stable crystallization of organic materials in microfluidic channels. The invention can interface not only with microfluidic / microscale equipment, but with macroscale equipment to allow for the easy injection of fluids (e.g., fluids containing crystal precursor), extraction of crystals, determination of one or more crystal properties (e.g., crystal size, size distribution among multiple crystals, morphology, etc.), etc.

The invention provides a bridgman growth method for the growth of lanthanum aluminate LaAlO3 crystals, which includes the following steps. (1) The Al2O3 and the La2O3 are taken as the raw materials in which the quantity ratio is in accordance with the chemical composition of LaAlO3, mixed and pressed. (2) The crucible loaded with the raw material briquetting is moved inside a vacuum decline furnace. The temperature is increased to 10-2-10-4Pa through the vacuum pumping. The insert protection gas is charged when the furnace temperature is increased to 1500 to 1700 DEG C, and then the temperature in continuously increased to 2100 to 2300 DEG C. (3) The raw materials and the top of the seed crystals are in melting so that the inoculation growth can be achieved. The temperature gradient of solid-liquid interface for the crystal growth is within a framework of 25 to 85 DEG C / cm, and the crucible decline rate is between 0.2 to 10 mm / h. (4) After the crystal growth is completed, the furnace temperature is reduced to a room temperature with the speed of 30 to 100 DEG C / h. The obtained lanthanum aluminate crystals have excellent crystal properties, low dielectric constant and dielectric loss as well as medium refractive index.

The invention discloses a method for separating arsenic and alkali in arsenic and alkali residues based on a superfine ferric hydroxide colloid. The method includes the steps: leaching the arsenic andalkali residues by water, and performing antimony removal on leaching solution through oxidation to obtain solution containing sodium carbonate and sodium arsenate; adding iron arsenate crystal nucleus and the superfine ferric hydroxide colloid to perform reaction to obtain iron arsenate crystals, and performing solid-liquid separation to obtain solution containing sodium carbonate and an iron arsenate product; leading carbon dioxide into the solution containing the sodium carbonate to perform reaction to separate out sodium hydrogen carbonate crystals, and performing thermal decomposition onthe sodium hydrogen carbonate crystals to obtain a sodium carbonate product. According to the method, arsenate in arsenic and alkali residue leaching solution is adsorbed and converted by the superfine Fe (OH)3 colloid with high activity to generate stable iron arsenate precipitation with low solubility and good crystal property, arsenic and alkali in arsenic and alkali residue leaching solutionare effectively separated, and the method overcomes the shortcomings of low iron salt arsenic removal utilization efficiency, incomplete purification and the like under the strong alkaline condition,is simple in process and convenient to operate and meets industrial production.

Stable anti-ferromagnetic exchange coupling can be obtained between a first pinned magnetic layer in a magnetoresistive element and a second pinned magnetic layer through smoothing of a non-magnetic intermediate layer, by smoothing the first pinned magnetic layer. The magnetoresistive element is made by sequentially laminating an underlayer, an anti-ferromagnetic layer, the first pinned magnetic layer, the non-magnetic intermediate layer, the second pinned magnetic layer, a tunnel barrier layer, a free magnetic layer, and a protection layer. The first pinned magnetic layer is smoothed before the non-magnetic intermediate layer is laminated over the first pinned magnetic layer. Stable magnetoresistive characteristics can be obtained, even when thickness is reduced, by smoothing the tunnel barrier layer. In that case, excellent magnetoresistive characteristics can also be obtained even when the tunnel barrier layer requires crystal properties.

The present invention relates to an olefinic copolymer having novel crystal properties and enabling the provision of a molded article with further improved strength and impact strength when compoundedwith other resins, and a process for preparing the same. The olefinic copolymer is an olefinic copolymer comprising an ethylene repeating unit and an [alpha]-olefinic repeating unit. The olefinic copolymer comprises polymer fractions defined by three different peaks at a predetermined temperature when analyzed by cross-fractionation chromatography.

A group 13 nitride crystal having a hexagonal crystal structure and containing at least a nitrogen atom and at least a metal atom selected from a group consisting of B, Al, Ga, In, and Tl. The group 13 nitride crystal includes a first region disposed on an inner side in a cross section intersecting c-axis, a third region disposed on an outermost side in the cross section and having a crystal property different from that of the first region, and a second region disposed at least partially between the first region and the third region in the cross section, the second region being a transition region of a crystal growth and having a crystal property different from that of the first region and that of the third region.

The invention discloses a crystal property prediction and classification method based on an attention mechanism and a crystal graph volume neural network, and the method comprises the steps: obtaining a crystallography information file and DFT calculation data of a crystal, and dividing the crystallography information file and DFT calculation data into a training set, a verification set and a test set; extracting crystal features from the crystallography information file, inputting the crystal features into a neural network, and obtaining neural network output; respectively training and verifying a constructed neural network model by adopting the training set and the verification set to obtain a prediction model and a classification model; completing the prediction of crystal properties through the prediction model, and completing the classification of the crystal properties through the classification model. The method can effectively improve the prediction and classification precision of crystal properties, consumes less time, has engineering practical value, is beneficial to realizing accurate large-scale crystal research simulation, and provides a method guarantee for development and research of new crystal materials.

The present invention comprises a stent comprising a blend formed from a polymer. The polymer comprises poly-L-lactide, poly-D-lactide or mixtures thereof and a copolymer moiety comprising poly-L-lactide or poly-D-lactide linked with ε-caprolactone or trimethylcarbonate. The poly-L-lactide or poly-D-lactide sequence in the copolymer moiety is random with respect to the distribution of ε-caprolactone or trimethylcarbonate and the copolymer moiety molecular weight ranges from about 1.2 IV to about 4.8 IV. The meandering elements may be stretched to a modulus ranging from about 250000 PSI to about 550,000 PSI. One, two, three, n or all segments of the meandering element may have a decreased cross-sectional area and may have a wide-angle X-ray scattering (WAXS) 2θ values of ranging from about 1 to about 35 after stretching. The crystal properties of the bioabsorbable polymers may change during crimping and / or expansion allowing for improved mechanical properties such as tensile strength and slower degradation kinetics.

A group 13 nitride crystal having a hexagonal crystal structure and containing at least a nitrogen atom and at least a metal atom selected from a group consisting of B, Al, Ga, In, and Tl. The group 13 nitride crystal includes a first region disposed on an inner side in a cross section intersecting c-axis, a third region disposed on an outermost side in the cross section and having a crystal property different from that of the first region, and a second region disposed at least partially between the first region and the third region in the cross section, the second region being a transition region of a crystal growth and having a crystal property different from that of the first region and that of the third region.

The invention discloses shell carving black pottery. The shell carving black pottery is formed by splicing shells on the outer surface of a black pottery bottle in a shell carving picture manner, and is a coastal city featured product with extremely high ornamental value, artistic value and collection value. A specific manufacture method of the shell carving black pottery comprises the steps of 1, wiping the surface of the black pottery bottle after firing; 2, selecting shells according to a designed shell carving picture, and sculpturing and polishing the shells for later use, wherein the fitting gap between each shell for later use and the part to be spliced of the black pottery bottle is less than or equal to 1 millimeter; 3, splicing the shells on the surface of the black pottery bottle by woodworking glue; and 4, drying the glue, and cleaning the surface of the black pottery bottle. The shell carving black pottery provided by the invention is convenient to display, present and carry, the simple and elegant property of the black pottery and the exquisite and crystal property of the shell carving are combined and can complement each other, the unique regional culture color of the black pottery is shown, and the superhigh artistic creation level and the high craft level are shown.

The invention provides a sample preparation method for normal EBSD analysis of an electronic aluminum foil for an electrolytic capacitor. The sample preparation method comprises the following steps of: sampling and inlaying; mechanical polishing; vibration polishing; electrolytic polishing; and resin dissolving. The method of the invention can obtain a high-quality sample test surface meeting therequirements of EBSD analysis conveniently, quickly and accurately, and the qualified rate of samples can reach more than 90-98%, so that the method is suitable for the detection and analysis of normal plane grains of the electronic aluminum foil for the electrolytic capacitor, lays a foundation for the study of the correlation between grain orientation, grain boundary characteristics, long and short corrosion holes and the specific volume of corrosion foils, and provides support for the study of the relationship between the crystal properties of the electronic aluminum foil for the electrolytic capacitor and the comprehensive performance of products.