1020results about How to "The size is easy to control" patented technology

The invention belongs to the field of nanoparticle preparation, in particular to metallic nano cluster / silicon dioxide hollow nuclear shell structured nanoparticles and a one-step controllable preparation method thereof. The used surfactant is a nonionic surfactant, the organic phase is cyclohexane, toluene and other organic hydrocarbons, and a metal saline solution and a metal complexing agent are added to form a reversed micelle system. Meanwhile, the complexed metal saline solution in the reversed micelle system is reduced to obtain metallic nanoparticles and then ammonia water and ammoniawater are added directly in the solution to obtain size and shape controllable hollow silicon dioxide nuclear shell material with metallic nano clusters distributed uniformly on the inner wall of thecavity. The method has the advantages of simple process, easy operation and great yield and can obtain size and shape controllable metallic nano cluster / silicon dioxide hollow nuclear shell structured nanoparticles.

The invention relates to a method for enhancing a Raman spectrum by using shell isolated nano particles, relating to the field of detection of laser Raman spectrums. The invention provides the universal method which has easy and fast preparation, low cost, strong Raman signal, good repeatability and accurate result, and is used for enhancing the Raman spectrum by using the shell isolated nano particles. The method comprises the following steps of: preparing the shell isolated nano particles with nuclear shell structures taking metal nano particles as kernels and extremely-thin shell inert materials as outer shells; uniformly scattering the shell isolated nano particles on the surface of a sample to be measured; and directly detecting the surface enhanced Raman spectrum.

The invention discloses a micro hemispherical resonator gyro and a preparation method thereof, belonging to the field of micro / nano processing and manufacturing. The preparation method comprises the following steps of: performing ICP etching on a high-resistance silicon wafer to obtain a silicon body 1; depositing polycrystalline silicon and etching to obtain a preliminary electrode 3; depositing carbon dioxide on the front, and imaging to form a carbon dioxide mask 4; etching to obtain a hemispherical harmonic oscillator cavity 5 and an electrode 6; removing the carbon dioxide mask 4, and performing ICP etching on the back to obtain a support body cavity 7; depositing carbon dioxide insulating layers 8 on the front and back sides; depositing polycrystalline silicon on the front and back sides to obtain a hemispherical harmonic oscillator 9, a support body 10 and a signal loading electrode 11; and thinning and polishing on the front, removing excessive polycrystalline silicon and etching carbon dioxide to obtain the movable hemispherical harmonic oscillator 9. According to the invention, the support body cavity is processed, the carbon dioxide and polycrystalline silicon are deposited, and the size of the support surface of the support body is easily controlled; and electroconductive polycrystalline silicon is deposited and filled by use of a processing electrode tank, and the shortcoming of excessively small working area of a drive electrode and a sensitive electrode is overcome.

The invention relates to a large size full color colloid photon crystal membrane and the method for making the same. The method comprises: covering monodisperse polymer emulsion particle with hard shell-soft shell structures on the flat base material to form full color colloid photon crystal membrane after dispersion volatilizing, the model having cellular structure; the thickness of the single dispersion polyaromatics emulsion particle shell is 20-50nm, the range of the diameter of emulsion particle is 170í½300nm, and the multi dispersion index is less or equal to 0.005.

The invention provides an organic hydrophobic modified cobalt-based fischer-tropsch synthesis catalyst. The catalyst consists of the following components in percentage by weight: 5.0 to 30.0 percent of cobalt serving as an active component, 50 to 80 percent of carrier, 5 to 20 percent of silicon dioxide and 5 to 40 percent of hydrophobic groups. The catalyst has the advantages of simple preparation process and high selectivity of middle distillate oil.

The invention discloses a miniature hemispherical resonant gyroscope based on an SOI (silicon on insulator) silicon slice and a manufacturing method of the miniature hemispherical resonant gyroscope, belonging to the field of micro / nano processing and manufacturing. A driving electrode 16 and a sensitive electrode 17 of the gyroscope are composed of independent silicon blocks formed by dividing a structural silicon body 1 internally provided with a hemispherical hollow cavity through a plurality of radial structural silicon grooves 14, the area of the driving electrode 16 and the sensitive electrode 17 relative to a hemispherical harmonic oscillator 8 is increased, and the driving force and the detecting capacitance are increased to facilitate the driving and signal detection of the hemispherical harmonic oscillator 8; and meanwhile, the independent silicon blocks formed by the divided structural silicon body 1 enables a silicon dioxide sacrificial layer 6 to be corroded more easily. The gyroscope processing method disclosed by the invention is used for processing a supporting body hollow cavity 10 through ICP (inductively coupled plasma) etching and depositing conductive polysilicon to form a cylindrical supporting body 11, so that the size of the supporting surface of the supporting body is controllable to beneficially control the vibration mode distribution of the hemispherical harmonic oscillator 8; and meanwhile, when processing the driving electrode 16 and the sensitive electrode 17, the back surfaces of the driving electrode 16 and the sensitive electrode 17 are firstly processed to protect the hemispherical harmonic oscillator 8 from being corroded.

The invention relates to the technical field of flat panel display, and provides a backlight module and a liquid crystal display device. The backlight module comprises a light source module, an optical panel and an optical module, wherein the light source module can emit blue light, the optical module is arranged above the optical panel, and the optical panel is provided with a ZnSe: Mn quantum dot nano material which can be excited to produce white light by the blue light. In the invention, a blue-light LED (light-emitting diode) is adopted for exciting the ZnSe: Mn quantum dot nano material, and compared with the existing fluorescent powder, the quantum dot nano material has various advantages such as controllable particle size, uniform dispersion, high and stable excited conversion efficiency, and high lighting effect; and a chip and an exciting material are separated, so that the temperatures of the two are effectively reduced, and the heat dissipation problem of LED driving is solved.

The invention discloses a degradable open porous magnesium and magnesium alloy biomaterial and a preparation method thereof. The magnesium and magnesium alloy biomaterial is in a completely open structure, the hole shape and size are controllable, holes are communicated by virtue of communicating holes, and the number and size of the communicating holes in hole walls are controllable; the holes are uniformly distributed and the porosity is adjustable. The preparation method comprises the following steps: sintering sodium chloride crystal particles to obtain an open porous sodium chloride prefabricated structure; pouring molten magnesium or magnesium alloy into a mould cavity with a sodium chloride prefabricated body, and performing seepage pressure casting; and removing magnesium or magnesium alloy block outer skin with the sodium chloride prefabricated body, washing with alkali, and filtering to remove sodium chloride to obtain the degradable open porous magnesium and magnesium alloy biomaterial. The preparation process is simple, convenient to perform and pollution-free; the prepared open porous structure is provided with the communicated and uniformly distributed holes, is controllable in hole shape and size, relatively high in porosity and strength, free of pore former residues and pore closing phenomenon and adjustable in degradation rate, and can serve as a new-generation degradable bone tissue engineering scaffold.

The invention relates to the field of an infrared detector, in particular to a micromachined thermopile infrared detector. The manufacturing technique is simplified and the performance and finished product rate are improved. The manufacture of the micromachined thermopile infrared detector comprises the following steps of: (1) depositing silicon nitride film on the both sides of a silicon substrate by an LPCVD method; (2) etching to remove peripheral silicon nitride film on the frontal side of the silicon substrate by lithography; (3) manufacturing a plurality of Poly-Si strips both ends of which are respectively arranged on the silicon nitride film and the silicon substrate by LPCVD method and photolithographic process; (4) manufacturing a plurality of aluminum strips which form a thermocouple with the plurality of Poly-Si strips by sputtering and photolithographic processes; (5) depositing the silicon nitride film on the frontal side of the silicon substrate by PECVD method; (6) manufacturing an infrared absorption layer (a carbonized photoresist layer) covering the hot junction area of the thermopile with photolithographic process; (7) manufacturing a metal reflective layer (a metal layer) covering the cold junction area of the thermopile with lift-off process; and (8) eroding the back side of the silicon substrate to form a square frustum pyramid shaped groove. The micromachined thermopile infrared detector has reasonable structure design, simple manufacturing process, high detector performance, high finished product rate, good development prospect and is easy to realize.

The invention discloses a preparation method of a cadmium selenide or cadmium sulfide two-dimensional monocrystal nanosheet. The method comprises the steps that the CdSe or CdS two-dimensional monocrystal nanosheet is prepared through a van der Waals epitaxial growth technology, the method is characterized in that a mica sheet which is smooth in surface and free of chemical dangling bond is adopted to serve as a substrate, CdCl2 powder or Se powder or S powder serves as a source material, argon serves as carrier gas, CdCl2 stream is reacted with Se or S steam to form CdSe or CdS steam at high temperature, and the steam is deposited on the mica sheet for nucleation and epitaxially grows into the CdSe or CdS two-dimensional monocrystal nanosheet. The preparation method of the cadmium selenide or cadmium sulfide two-dimensional monocrystal nanosheet is easy to operate, low in cost and strong in controllability, the obtained CdSe or CdS has the advantages of being good in size uniformity, high in degree of crystallinity and the like, and important research value and wide application prospect in the fields of solar cells, field effect transistors, photoelectric detectors, photocatalyses and the like are achieved.

The invention discloses a method for preparing a graphene-loaded platinum nano catalyst, which comprises the following steps of: (1) preparing graphene (GNS); (2) preparing polydiallyl dimethyl ammonium chloride (PDDA) functional graphene; and (3) preparing the graphene-loaded platinum nano (Pt / GNS) catalyst. The method has the advantages of uniformly adsorbing and distributing PtCl6<2-> with negative charge on the surface of the GNS through electrostatic adhesion by using positive charge uniformly distributed on the surface of the PDDA-modified GNS, solving the technical problem that metallic particles per se aggregate, realizing higher loading rate of PtNPs and having uniform grain size and controllable size.

The invention relates to a lightweight periclase-magnesium aluminate spinel refractory material for a rotary cement kiln and a preparation method thereof. According to the scheme, the preparation method comprises the following steps of: uniformly dispersing 0.2 to 4wt% of magnesite micro powder and 0.2 to 4wt% of active alpha alumina micro powder into 5 to 8wt% of binding agent to obtain a modified binding agent; adding 50 to 70wt% of porous periclase-magnesium aluminate spinel ceramic particles to a vacuum agitating machine; vacuumizing to be below 2.5kPa; maintaining the constant pressure for 3 minutes; adding the modified biding agent to the vacuum agitating machine; agitating for 10 minutes; closing a vacuumizing system; then adding 10 to 25wt% of porous periclase-magnesium aluminate spinel ceramic fine powder, 4 to 20wt% of fine magnesia powder, and 1.5 to 4wt% of magnesium aluminate spinel fine powder to the vacuum agitating machine; uniformly agitating; mechanically pressing and modeling; drying; and maintaining the temperature of 1,500 to 1,650 DEG C for 2 to 10 hours. The lightweight periclase-magnesium aluminate spinel refractory material for the rotary cement kiln has the advantages of being low in heat conductivity, high in intensity, high in thermal shock resistance, high in kiln coating performance, and high in resistance to medium erosion.

The present invention belongs to the field of inorganic material technology, and is especially one kind of magnetic metal oxide microsphere in core-shell structure and its preparation process. The microsphere has ferroferric oxide microsphere as the core and metal oxide as the shell. It is prepared through the first hydrothermal process to cover one layer of amorphous carbon onto ferroferric oxide microsphere to form magnetic carbon microsphere Fe3O4@C, the subsequent dispersing microsphere Fe3O4@C in alcohol water solution of pre-hydrolyzed metal alkoxide for adsorbing inorganic oligomer to the surface of the microsphere, and the final calcining in nitrogen atmosphere to obtain the magnetic metal oxide microsphere in core-shell structure. The process is simple and practical, and has adjustable size of the microsphere. The magnetic metal oxide microsphere has important application in separating protein, separating polypeptide and other fields.

The invention relates to a method for preparing a collagen protein / silica membrane double-layer stent. According to the invention, a collagen sponge with a porous network structure is prepared through different crosslinking methods, and a layer of silica membrane with different thicknesses is coated on the collagen sponge again, then the collagen protein / silica membrane double-layer stent is prepared. The collagen protein / silica membrane double-layer stent obtained in the invention has a good effect in an application of being used as an artificial skin stent material, and two layers of the material have different functions, namely the outer layer of the silica membrane has higher mechanical strength to be capable of supporting and protecting a wound, and a good gas-liquid permeability performance to be capable of effectively preventing fluid loss, and a moderate density performance to be capable of preventing bacterial infections and providing a moister environment for wound repair; the inner layer of the collagen sponge can effectively promote cell proliferation and differentiation, delay wound contraction and accelerate wound healing.

The invention relates to a profile controlling and flooding composition for high-temperature oil reservoirs with high salinity and an application of the composition in tertiary oil recovery of the high-temperature oil reservoirs with high salinity, and mainly aims at solving the problems of poor heat resistance and salt tolerance and low oil displacement efficiency of an oil displacement agent under the conditions of high temperature and high salinity in the prior art. The problems are well solved by virtue of the following technical scheme: the profile controlling and flooding composition for high-temperature oil reservoirs with high salinity is prepared from the following components in percentage by weight: (1) 0.01-3.0% of heat-resistant and salt-tolerant polyacrylamide microspheres, (2) 0.01-5.0% of anionic-nonionic surfactant and (3) 92.0-99.98% of injected water; and the profile controlling and flooding composition can be applied to field applications for increasing the recovery rate such as depth profile controlling, water plugging and oil displacement for tertiary oil recovery of the high-temperature oil reservoirs with high salinity.

The invention discloses a three-dimensional porous chitosan / gelatine microsphere, a preparation method thereof and an application thereof in liver cell culture. The preparation method thereof comprises the following steps of: rapidly freezing mixture into spheres by dropping liquid nitrogen by virtue of a high-pressure pulse microcapsule moulding instrument after chitosan and gelatine B are mixed, carrying out secondary freeze-drying after microspheres subjected to primary freeze-drying are crosslinked and cured with saturated tripolyphosphate-85% ethanol solution, fully hydrating the microspheres obtained by the secondary freeze-drying, adding cross linking agent carbodiimide / N-hydroxy succinyl, modifying the microspheres with gelatine A, removing unreacted carbodiimide / N-hydroxy succinyl and gelatine A by washing after water bath and reaction in dark place are carried out, and carrying out tertiary freeze-drying, thus the three-dimensional porous chitosan / gelatine microspheres with the diameter of 300-800Mum and the surface aperture of 50-200mu m are obtained, and the surface of each microsphere is connected with the aperture of the interior of the microsphere. The three-dimensional porous chitosan / gelatine microspheres obtained by the invention can be used for in vitro culture of high-density and high-activity liver cells.

The invention relates to a liquid-drop-generation capillary microfluidic chip and a preparing method thereof. The liquid-drop-generation capillary microfluidic chip adopts a capillary as a function unit for generating and collecting liquid drops, and comprises a microfluidic chip etched with microchannels and the capillary. By combination of the microfluidic chip and the capillary, the liquid-drop-generation capillary microfluidic chip achieves introduction of two incompatible liquids on the microfluidic chip, achieves liquid drop generation at the intersection of the microfluidic chip and the capillary, and directly collects liquid drops in the capillary. The liquid-drop-generation capillary microfluidic chip is simple in structure and convenient to operate, overcomes the problem that liquid uniformity and the like are liable to damage in traditional liquid drop collection-generation and collection methods, and achieves integration of liquid drop generation and capillary collection.

The invention discloses a multi-arm star-type polymer and a preparation method thereof. The method synthesizes the multi-arm star-type polymer by a method with the following two steps of step one: taking a complex formed by a polydentate nitrogen-contained compound and a transitional metal halide as a catalytic system so as to catalyze the polymerization of atom transfer free radicals and self-condensing vinyl of a monomer, thus preparing and obtaining the halogen atom-contained hyperbranched polystyrene macromolecular initiator taken as the star-type polymer core; and step two: taking the complex formed by the the polydentate nitrogen-contained compound and the transitional metal halide as the catalytic system and taking the prepared halogen atom-contained hyperbranched polystyrene macromolecular as the initiator to initiate the polymerization of the atom transfer free radicals of the monomer, thus preparing and obtaining the multi-arm star-type polymer with controllable core structure, core size, core property, arm number, arm length and arm property and adjustable molecular weight within wider range.

The invention relates to a preparation method of chitosan microcapsule with uniform size and controllable size using a microfluidic device based on gas-liquid shearing principle. The preparation method specifically comprises the steps: firstly assembling the microfluidic device, then introducing a chitosan or chitosan quaternary ammonium salt solution as an internal phase, and a gas as an external phase into the microfluidic device, under the strong shearing action of the gas, forming micro-droplets by the internal phase solution at an outlet of the microfluidic device, dripping the micro-droplets into receptor fluid of an anionic surfactant or polyanion electrolyte, and precipitating and condensing chitosan or chitosan quaternary ammonium salt to form a layer of polymer film shell on outer layers of the micro-droplets, thus finally obtaining the chitosan microcapsule. The chitosan microcapsule prepared by the preparation method is regular in shape and uniform in size distribution, the size of the microcapsule can be effectively controlled by changing flow velocity conditions, and the preparation process is convenient and easy, and strong in operability. The obtained microcapsule can be used in the fields of active material microencapsulation and drug controlled release.

The invention provides a sol-solvent thermal method for synthesizing a nanocrystalline oxide powder. The method comprises the following: (1) a step of preparation of inorganic salt mother liquids, during which the inorganic salt taken as a material is dissolved in an organic liquid medium or water to prepare a mother liquid of the inorganic salt with definite concentration; (2) a step of preparation of a precipitation reactant liquid, during which alkali is dissolved in an organic liquid medium or water, proper quantity of surfactants are added to prepare the precipitation reactant liquid with definite concentration; (3) a step of preparation of sols, during which, at a certain temperature, while stirring, the prepared reactant liquid is slowly added in the prepared mother liquid of the inorganic salt, the reactant liquid and the mother liquid of the inorganic salt are kept reacting for a period of time after adding the reactant liquids in the mother liquid of the inorganic salt, and the transparent sols are obtained; and (4) a step of solvent thermal reaction of the sols, during which the prepared sols are put in a reaction kettle and reacted for a period of time under a certain temperature and pressure, the products obtained are subjected to filtering, washing and drying, and the nanocrystalline oxide powder is obtained.

The invention relates to a natural gas hydrate synthesis and decomposition multi-parameter test device which comprises a high-pressure reaction system, a low-temperature cooling system, a parameter test system and a data acquisition system, wherein the high-pressure reaction system comprises a reaction clamp, a vacuumizing system, a natural gas supply system, a saline water supply system, a visualization system and an inlet / outlet metering chamber. The natural gas hydrate synthesis and decomposition multi-parameter test device can both simulate synthesis and decomposition of a natural gas hydrate and test various parameters of the natural gas hydrate, such as the sound wave, the resistance, the mechanics, the synthesis speed, the decomposition gas amount, the porosity, the permeability and the heat conductivity; the mechanics parameters not only comprise a dynamic Young modulus and a poisson ratio which are calculated according to a sound wave test value, but also comprise a static value and the compression strength of the hydrate. The device can also be used for achieving visualization and quick coring functions.

The invention involves a new preparation method for amorphous alloy catalyst, it uses KBH4 as reductant, mixes one or two of nickel sulfate, nickel acetate, nickel nitrate, nickel chloride, cobalt sulfate or cobalt chloride into main salt and dissolves them into solution of ethylenediamine, tartaric acid or tartrate, prepares non-load or load amorphous alloy catalyst using oxidant, molecular sieve and high polymer as the carrier. The amorphous alloy catalyst prepared through the invention has characteristics of small dimension of active components, good dispersion degree, high yield of catalyst and high catalyst activity, and it applies to catalyzing hydrogenation and hydrogenation dechlorination reaction.

The invention discloses a method for preparing a bisphenol A molecularly imprinted polymer. The method comprises the following steps of: adding bisphenol A, a functional monomer and porogen into a conical flask to ensure that the bisphenol A and the functional monomer are fully reacted, wherein the functional monomer is 2- vinylpyridine, and alpha-methacrylic acid, the porogen is chloroform and methylbenzene, the polarity of the chloroform and methylbenzene is low, and hydrogen bonds are not easily formed; adding initiator and a cross-linking agent, fully mixing and performing ultrasonic processing, introducing nitrogen to remove dissolved oxygen, and transferring into a thermostat water bath in a sealing state and performing thermal polymerization; and after reaction, taking out the obtained product, cooling to room temperature to obtain colloidal polymer, screening the colloidal polymer by using a 200-mesh molecular sieve, performing Soxhlet extraction by using acetic acid-methanol, washing the extract by using methanol, and drying under vacuum to obtain the bisphenol A molecularly imprinted polymer. The prepared bisphenol A molecularly imprinted polymer has the characteristics of specific adsorption to specific organic pollutant bisphenol A in industrial wastewater, high selectivity on a sample and high speed, accuracy and efficiency in enrichment and purification.

The invention relates to a method for preparing a ceramic tritium breeding agent in a fusion reactor blanket, pertaining to the nuclear fusion field, in particular to a technique for preparing the ceramic tritium breeding agent pellets in the fusion reactor blanket. The method is characterized in that: organic monomers that can generate free radical polymerization and a crosslinking agent are mixed and dissolved with water or an organic solvent to prepare a pre-mixed solution, then ceramic tritium breeding agent powder is added and an initiator and a catalyst are added after defoaming treatment so as to prepare a slurry; the slurry is dripped into a medium by using a dripping device and the medium is in the state of being heating and is exclusive to the solvent used in the slurry. After entering the medium, the dripping liquid takes the form of pellet, solidifies and maintains the shape during the dropping process; the pellet is collected, cleaned, dried and sintered into the tritium breeding agent ceramic pellet material. The formed blanket has high strength and toughness; the formed pellet has high degree of sphericity, smooth surface and good evenness; the shrinkage after drying and sintering are slight, the size of the pellet is easy to be controlled and the strength is high; additionally, the cost is relatively low and the technique is flexible.

The invention discloses a uniform fluorescent microball and a preparation method. The preparation method includes the following steps: (1) preparing porous polymer microballs with uniform particle diameter and hole diameter in advance; (2) compounding quantum dots in the polymer microballs prepared in the step (1) so as to obtain quantum-dot polymer composite microballs; and (3) dispersing the quantum-dot polymer composite microballs prepared in the step (2) into ethanol / water mixed solution and adding ethyl silicate to prepare the fluorescent microball with the surface covered by silicon dioxide. The particle diameter of the fluorescent microball prepared by the above preparation method ranges from 500nm to 100 mu m and is uniform and controllable, and the fluorescent microball is high in fluorescent efficiency and stable in chemical property and has potential application value in the bioinstrumentation and medical fields.

The invention discloses a traditional Chinese painting verification method and a traditional Chinese painting verification device based on a spectral imaging technology. The traditional Chinese painting verification device comprises an image collection module and an image analysis and verification module, wherein the image analysis and verification module comprises a computer, a data base and a display; the image collection module comprises a sealing device, a stable light source with a controllable broadband, spectral imaging consisting of a CCD (Charge Coupled Device), a lens and a light filter device, and an image collection card connected with the CCD; and the stable light source with the controllable broadband is located in the sealing device. The traditional Chinese painting verification method comprises the steps that the stable light source with the controllable broadband is used for irradiating a traditional Chinese painting to be verified; the image collection card is used for collecting spectrum images of different wavebands, which are imaged by spectral imaging, and unloading the spectrum images into the computer; and the computer calls a database to analyze and compare and outputs a verification result to a display. The verification method and device provided by the invention have the characteristics of low background noise, and uniform and controllable light intensity, and can be used for identifying by simultaneously combining spectral signatures with image features.

The invention discloses multi-touch system and method in the technical field of computer vision. The method includes: establishing spatial correspondence between a Kinect camera and a projection screen; allowing a computer to preprocess an image captured by the Kinect camera; extracting a hand image from the preprocessed image; acquiring coordinates and directions of fingers in the hand image by finger contact detection algorithm; tracking finger contacts by minimum distance first algorithm; recognizing the finger contacts by means of template matching to obtain corresponding operational information of the finger contacts; and transmitting the operational information to the computer which analyzes the operational information and controls corresponding operations for the image in the current screen according to analysis results. Man-machine interactive multi-touching is achieved by the Kinect camera detecting acts of human fingers on the projection screen, and replaces the mouse and keyboard, and the operation is well performed in a real-time manner. The projection screen needs to be planar only, and adaptability of screen operation is increased greatly.

The invention discloses an X-ray imaging device and an imaging method thereof. The X-ray imaging device comprises a base, a slide track is arranged on the base and provided with a first end and a second end, and the upper edge of the slide track is sequentially provided with a ray source control device, a support control device and a receiver control device. The ray source control device comprises a first column, a first pitching motion device and a ray source. The support control device comprises a table top support column and a rotary table top, wherein the table top support column can movably connected to the slide track, and a rotary shaft is arranged in the table top support column. The rotary table top is connected with the rotary shaft and is supported on the table top support column through the rotary shaft. The receiver control device comprises a second column, a second pitching motion device and a receiver. The X-ray imaging device and the imaging method integrates a perspective mode, a cone-beam round track CT mode, a cone-beam a cone-beam track CT mode and a digital theater system DTS mode.

The invention discloses a degradable open-cell porous zinc / zinc alloy biomaterial and a preparation method thereof. The degradable open-cell porous zinc / zinc alloy biomaterial is of a completely open-cell structure, wherein the hole pattern and the size are controllable, holes are communicated by use of communicating holes, and the number and the size of the communicating holes in the hole walls are controllable; the biomaterial is even in overall hole distribution and adjustable in porosity. The preparation method of the biomaterial comprises the following steps that sodium chloride crystal particles are sintered to obtain an open-cell porous sodium chloride prefabricated structure; a zinc or zinc alloy melt is poured into a die cavity in which a sodium chloride prefabricated body is put and pressure seepage casting is performed; the outer skin of a zinc or zinc alloy block containing the sodium chloride prefabricated body is removed, and then alkali wash is performed and the sodium chloride is performed to obtain the degradable open-cell porous zinc / zinc alloy biomaterial. The preparation method of the degradable open-cell porous zinc / zinc alloy biomaterial is simple in process, convenient to operate and pollution-free; the obtained open-cell porous structure has the advantages that the holes are communicated with each other and distributed evenly, the appearance and size of the holes are controllable, the porosity and the strength are relatively high, no hole forming agent is left and hole closure is prevented, and meanwhile, the degradation rate is adjustable; as a result, the biomaterial can be used as a new generation degradable bone tissue engineering stent.

The invention provides technology for preparing porous heat insulation plates by sintering iron tailings, comprising the following steps: breaking and then grinding shale and the iron tailings, sieving and measuring the ground shale and iron tailings to ensure the fineness is 20-80mu m; adding toughening agents, cosolvents and foaming agents into the ground shale and iron tailings in proportion and mixing the above materials, adding water to the mixture for prilling, after natural drying, distributing raw material balls on the moulds, then placing the moulds into a kiln to be sintered by way of sectional heating, and finally stacking the products after demoulding the cooled plates. The technology utilizes a great number of iron tailings with the highest addition up to 40%, saves energy andis beneficial to environmental protection. The volume density and pore sizes and distribution of the plates can be controlled by the addition and sintering schedules of the foaming agents. The prepared plates enjoy uniform pore distribution, high strength and good heat preservation and insulation properties.