54 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.

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.

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.

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.

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.

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 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 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.