289results about How to "Cut well" patented technology

The invention relates to an all-solid-state electrolyte, the preparation method and the application, which solves the problems that the liquid state electrolytet in the prior lithium ion secondary battery is easy to volatilize and has the leakage potential safety hazard, or the gel polymer electrolyte has a bad mechanical property and molding difficulty. The invention comprises lithium salt, polyethylene oxide, ultra fine powder packing. The invention prepares the all-solid-state electrolyte through the method that: firstly, the lithium salt and the solvent are mixed evenly and then the PEO powder is scattered in and mixed evenly; secondly, the ultra fine powder packing is added into the solvent and mixed evenly, and the mixture is stood; thirdly, the mixed liquids of the first step and the second step are mixed evenly, molded after being cast and dried, and then demoulded to form the product. The invention has the advantages that the all-solid-state electrolyte is used as the electrolyte of the all-solid-state secondary lithium battery and matches with the cathode of the metal lithium; thus the potential safety hazard of the liquid state electrolyte leakage is avoided, the mechanical property is good and the molding is easy.

The invention relates to a method to produce equivalent material of iron crystal sand cemented rock soil that uses iron ore, barite powder and quartz sand as main aggregate, uses solution that is made up from rosin and alcohol as cementing agent, and uses gesso as regulator. Whisking the iron ore, barite powder and quartz sand, gesso, resin-alcohol solution to equal, pouring into steel mould, pressing the mixture, opening the mould, drying for 2-3 days, the invention could be gained. The invention has the advantages of high unit weight, large range of mechanics parameter, easy to process and low cost.

The invention relates to a blanc fixe cementitious rock soil-like material and a method for making simulative rock from the blanc fixe cementitious rock soil-like material and belongs to the technical field of rock material simulation in a geomechanical model test. The blanc fixe cementitious rock soil-like material comprises blanc fixe as a aggregate, bentonite as an auxiliary material, and dilute glue composed of 107 glue and water. The method comprises the following steps of drawing a water-binder ratio-shearing strength f curve by the blanc fixe cementitious rock soil-like material, calculating wet density of different batches of the blanc fixe cementitious rock soil-like materials, and making a small test-piece from different batches of the blanc fixe cementitious rock soil-like materials. The blanc fixe cementitious rock soil-like material has a low cost and no toxicity, can be processed into small blocks easily, and can satisfy requirements of a geomechanical model test on the blanc fixe cementitious rock soil-like material. Simulative rock made from the blanc fixe cementitious rock soil-like material does not influence a model building process and can be made fast so that a model test rate is greatly improved. The blanc fixe cementitious rock soil-like material is suitable for the field of a test on a model built by laying small blocks.

The invention provides a compound cesium fluoborate, a nonlinear optical crystal with the cesium fluoborate, methods for preparing the compound cesium fluoborate and the nonlinear optical crystal and application of the compound cesium fluoborate and the nonlinear optical crystal. A chemical formula of the compound is CsB<4>O<6>F, the molecular weight of the compound is 291.15, and the compound is of a crystal structure and is prepared by the aid of solid-phase synthesis processes or vacuum packaging processes. A chemical formula of the nonlinear optical crystal is CsB<4>O<6>F, the molecular weight of the nonlinear optical crystal is 291.15, the nonlinear optical crystal belongs to orthorhombic crystal systems, space groups of the nonlinear optical crystal are Pna2<1>, crystal cell parameters of the nonlinear optical crystal include that an a is equal to 7.9241 , a b is equal to 11.3996 , a c is equal to 6.6638 and an alpha, a beta and a gamma are equal to 90 degrees, and the unit cell volumes of the nonlinear optical crystal are 601.95 <3>. Frequency doubling effects of the nonlinear optical crystal is approximately two times frequency doubling effects of KH<2>PO<4> [KDP (potassium dihydrogen phosphate)], and ultrasonic absorption edges of the nonlinear optical crystal are shorter than 190 nm. The nonlinear optical crystal is grown from the CsB<4>O<6>F by the aid of melt processes, high-temperature solution processes, vacuum packaging processes, hydrothermal processes or room-temperature solution processes. The compound cesium fluoborate, the nonlinear optical crystal, the methods and the application have the advantages that the nonlinear optical crystal is free of deliquescence in air, is good in chemical stability and can be applied to all-solid-state laser devices as an ultraviolet nonlinear optical crystal or deep ultraviolet nonlinear optical crystal.

The invention provides compound caesium potassium fluoborate and caesium potassium fluoborate non-linear optic crystal, and a preparation method and applications thereof. The chemical formula of the compound is CsKB8O12F2, the molecular weight is 488.48, and the compound is prepared via solid phase synthesis or vacuum packaging method. The chemical formula of the caesium potassium fluoborate non-linear optic crystal is CsKB8O12F2, the molecular weight is 488.48, the caesium potassium fluoborate non-linear optic crystal belongs to trigonal system, the space group is P321, the cell parameters a=b=6.598 angstroms, c=7.652 angstroms, alpha=beta=90 DEG, gamma=120 DEG, unit-cell volume is 288.5 angstroms, the frequency-doubled effect is about 2 times of that of KH2PO4(KDP), the UV absorption edge ranges from 150 to 200nm. Crystal growth of CsKB8O12F2 is realized via high temperature molten method, vacuum packaging method, hydrothermal method, or room temperature solution method; deliquescence of the crystal is not caused in the air; the chemical stability is excellent; and the crystal can be used in all-solid-state lasers as an ultraviolet, deep ultraviolet non-linear optic crystal.

The invention discloses a production process and device of an expanded polytetrafluoroethylene board. According to the technical scheme, the production process is characterized by comprising the following steps: screening refrigerated polytetrafluoroethylene dispersion resin, adding additives according to a ratio, ripening the mixed raw materials to obtain a blank, extruding the blank to form a rod material, rolling the rod material through a two-roller shaft to form a flaky film, degreasing, drying and stretching the flaky film, longitudinal and transversely drawing the flaky film, laminating the flaky film which is drawn in two directions, pressing the flaky film to obtain a sheet, and finally trimming the sheet to obtain the board. The production process of the expanded polytetrafluoroethylene board breaks through a traditional board production process, the problems of creeping and cold flow of an ordinary board can be solved, the compression resistance, the creeping loosening rate, the compression rate, the resilience property and the like of the expanded polytetrafluoroethylene board are obviously improved, and the expanded polytetrafluoroethylene board can be widely used for sealing aerospace, medical, food and petroleum pipelines and the like and has extremely good application temperature, an anti-aging property, no toxicity, no pollution and the like.

The invention discloses three-laminated composite board type full-nutritional rice seedling breeding bedding and a preparation method thereof and relates to rice seedling breeding bedding and a preparation method thereof. The problems that existing seedling breeding bedding is poor in water-retaining property, fertilizer efficiency in the later period of seedling breeding is poor, strength is low, and the existing seedling breeding bedding is not suitable for being transported and carried are solved. The seedling breeding bedding is divided into three layers from top to bottom, the middle layer is a core layer, and the surface layers are located on the two sides of the core layer. The preparation method comprises the following steps that (1), straw is cut into sections; (2), steaming and softening are conducted; (3), the straw is ground and kneaded to be in a fiber shape and is dried; (4), mixing is conducted; (5), paving is conducted; and (6), hot-pressing is conducted. According to the three-laminated composite board type full-nutritional rice seedling breeding bedding (as shown in figure 1) produced through the preparation method, when no water is absorbed by the three-laminated composite board type full-nutritional rice seedling breeding bedding, the static bending intensity is 21-22.8 MPa, and the internal bonding strength is 0.35-0.40 MPa; and the three-laminated composite board type full-nutritional rice seedling breeding bedding is high in strength, not prone to breakage or damage and easy to cut and can be manufactured to be in different shapes.

The invention provides a compound caesium rubidium fluorborate, a caesium rubidium fluorborate nonlinear optical crystal, a preparation method and application. The compound has a chemical formula of CsRbB8O12F2 and a molecular weight of 534.86, and is prepared by solid phase synthesis or vacuum encapsulation method. The crystal has a chemical formula of CsRbB8O12F2 and a molecular weight of 534.86, belongs to hexagonal crystal system, has a space group of P-62c, the cell parameters of a=b=6.5878 angstrom, c=7.813 angstrom, alpha=beta=90 degrees, gamma=120 degrees, and a unit cell volume of 293.6 angstrom<3>. The frequency-doubled effect of the crystal is 2 times that of KH2PO4(KDP), and the ultraviolet absorption edge is 150-200nm. CsRbB8O12F2 adopts high temperature melt liquid method, vacuum encapsulation method, hydrothermal method or room temperature solution method for crystal growth, the crystal has the advantages of no deliquescence in the air and good chemical stability, and can be applied as ultraviolet and deep ultraviolet nonlinear optical crystal in all-solid-state lasers.

The invention relates to a natural language processing technology, in particular to a verbal skill analysis and topic point recognition matching method and system. The method comprises the following steps: firstly, establishing a marketing verbal skill strategy analysis label library, respectively establishing a client label system and an agent label system for a client and an agent, and accurately identifying the willingness of the client; analyzing the marketing verbal skill strategy, completing automatic verbal skill extraction, and completing automatic verbal skill recommendation in combination with the client label and the excellent verbal skill library; and generating a marketing verbal skill analysis report according to the reference condition of the agent to the excellent verbal skill. According to the method, from verbal skill analysis to topic point identification, the client topic points are analyzed in a full-intelligent mode, excellent verbal skill is provided, the mode ofmanually extracting excellent verbal skill in the past is broken through, and a large amount of manpower and material resources are reduced.

In an electronic device realizing high-temperature terminal solder bonding in temperature-level bonding, the bonding portion between the semiconductor device and the substrate is formed by metal balls composed of Cu or the like and a compound composed of the metal balls and Sn, and Metal balls are held together by compounds.

The invention relates to a borate birefringent crystal for ultraviolet and deep ultraviolet. The birefringent crystal has a chemical formula Ba2Mg (B3O6)2, belongs to trigonal system, and has a space group of R-3; and a equals to 0.70528 (3) nm, and C equals to 1.65520 (9) nm, and Z equals to 12. The barium magnesium borate birefringent crystal is an aniaxial negative crystal with ne less than no, has a transmission range of 177-3000 nm and birefringence between 0.077-0.229, and is easy for cutting, grinding, polishing and storage, stable in air, and hardly deliquesced. The barium magnesium borate birefringent crystal is subjected to a self-melt spontaneous crystallization method, a melt Czochralski method or a fluxing medium method for growth; the barium magnesium borate birefringent crystal has large birefringence (no-ne = 0.077-0.229), has important application to fields of optics and communication for the production of polarized beam splitting prism.

The invention discloses a disc cutter trimming mechanism of a sheet extrusion machine. The mechanism comprises a lower disc cutter, a first rotating shaft, an upper cutter base, an upper cutter base positioning mechanism, an upper disc cutter, a second rotating shaft, a lower cutter base and a lower cutter base positioning mechanism, and is characterized in that an upper cutter acceleration mechanism is mounted on the upper cutter base, wherein a sheet following ring drives the upper disc cutter to rotate through a gear acceleration mechanism; and the gear acceleration mechanism enables the rotating linear velocity of the upper disc cutter to be quicker than the rotating linear velocity of the lower disc cutter. Compared with the prior art, the mechanism has the following beneficial effects: as the upper cutter acceleration mechanism is arranged, sheets are pulled to effectively drive the lower cutter and the upper cutter to rotate, the rotating linear velocity of the upper cutter is quicker than the passing linear velocity of the sheets, and the cutting of the cutter is facilitated; and the mechanism is simple in structure and excellent in use effect, effectively eliminates the slip phenomenon, and prevents the condition of incapability of cutting off the sheets due to no rotation of the upper cutter.

A corn peptide beverage is prepared from corn peptide, granular white sugar, auxiliaries and water through dispersing corn protein powder in water, enzymolyzing, adding organic acid and acidifying, and proportionally mixing it with others. Its advantages are agreeable taste and high content of peptide in it.

The invention relates to a borate birefringent crystal for an ultraviolet band. The chemical formula of the borate birefringent crystal is KBaSc(B3O6)2 and belongs to a trigonal system; an atom K and an atom Ba in a crystal structure are in disordered mixed occupation; a space group is R-3 and a cell parameter Z is 3; the transmission range is 184-3000 nm; a calculated value n0 of the refractive index at gamma of 589 nm is 1.6168, ne is 1.5079 and delta n is 0.1089; the crystal grows by using a self-melting and spontaneous crystallization method or a flux growth method; the crystal is easy to grow, cut, grind, polish and preserve, is stable in the air, is uneasy for deliquescence and is insoluble in water; the crystal can be used for making polarization beam splitters such as Glan prisms, Wollaston prisms, Rochon prisms or beam splitting polarizers; and the crystal is importantly applied to the optical and communication fields.

The invention provides a polycrystalline synthesis method and a single-crystal growth method of gallium selenide and relates to polycrystalline synthesis and single-crystal growth methods of mid-infrared and far-infrared non-linear materials, aiming at solving the technical problems of existing GaSe polycrystalline synthesis that the stoichiometric deviation is great and the yield is low, an invalid crystal nucleus is prone to form in a spontaneous nucleation phase and a single-crystal growth direction is uncertain. Polycrystalline synthesis comprises the following steps: putting monomer Ga into a small boat and putting the small boat at one end of a quartz tube; putting Se at the other end of the quartz tube; after vacuumizing, carrying out heat sealing; putting the quartz tube into a horizontal double-temperature-region pipe type resistance furnace and synthesizing to obtain a GaSe poly-crystal, wherein the stoichiometric ratio is 1 to (1 to 1.05) and the yield is more than 97 percent. Single-crystal growth comprises the following steps: adding the GaSe poly-crystal into a PBN (Pyrolytic Boron Nitride) crucible; then vertically putting the PBN crucible into the quartz tube; after vacuumizing, carrying out heat sealing; putting the quartz tube into a vertical double-temperature-region pipe type resistance furnace; after the single-crystal growth is finished, obtaining a GaSe single-crystal. The gallium selenide can be used as the mid-infrared and far-infrared laser materials for realizing output of 8Mum to 10Mum laser.

The invention relates to a full-thread fiber resin rod body soil nailing wall and a construction method thereof; a soil nail rod body of a soil nailing wall is a full-thread fiber resin rod body, auxiliary reinforcement ribs are arranged at positions situated on the upper part of an interior segment of a concentrate surface layer of the soil nail rod body, and continuous cross pressing ribs are arranged on the lower part thereof; the fastening nut is a resin nut; the lining plate is a resin lining plate injected by a resin material and is fastened on the outer surface of the concentrate surface layer; and ring locators are sleeved on the parts stretched into the side slope soil of the full-thread fiber resin rod body at intervals. Compared with the present soil nailing wall, the invention has the advantages of simple and convenient construction, energy saving, consumption reduction and larger application range of resin rod body; and the nut and lining plate situated on the end part of the rod body are situated at the outside of the concentrate surface layer, so the stress is more reasonable. Meanwhile, an expanding head is arranged at a position situated in the side slope of the rod body according to the actual engineering to form a reinforced expanding head soil nail, so that the plasticity is strong. The invention can be extensively applied in the construction of side slope soil nailing wall technique.

The invention discloses a wafer whose back side is coated with adhesive through adopting the silk screen printing and a process for preparing a back electrode of the wafer, the preparation process comprises the following five steps: preparing a wafer, and keeping the wafer flat in the subsequent steps, adopting the silk screen printing to coat the adhesive on the back side of the wafer and drying, arranging the wafer which is coated with the adhesive on a scribing blue film, separating, adhering and solidifying the separated wafer. The process eliminates the flanging phenomenon which easily occurs during the preparation of the wafer, the dosage of bonding slurry is reduced by one-third, the cost of the bonding slurry is greatly reduced by about ten percent, and the flatness of the coating surface of a back electrode of the chip is guaranteed, a scribing is easily cut, the intensity of the combination between the chip and the electrode during the eutectic welding is guaranteed, and the production time and cost are greatly saved. The wafer whose back side is coated with the adhesive of the invention can be stored for a long time, and the control to the quality of the stock is improved.

The invention belongs to the field of building materials and particularly relates to a molybdenum tailing aerated concrete block and a manufacturing method thereof. The molybdenum tailing aerated concrete block comprises, by weight, 65-78% of molybdenum tailings, 12-18% of quick lime, 5-18% of cement, 2.92-4.91% of gypsum and 0.08-0.09% of aluminum paste. The manufacturing method includes the following steps of (1) pre-processing raw materials; (b) crushing and grinding the quick lime to obtain quick lime powder; (c) preparing 8-10% aluminum paste suspension liquid by using the aluminum paste; (2) dosing and pouring; (3) precuring; (4) demolding and cutting; (5) steaming. The molybdenum tailing aerated concrete block is light in texture and good in thermal insulation property, has high compressive strength, overcomes the defect that a powder ash aerated concrete block is low in compressive strength, can replace clay bricks completely and is wide in use range. The method is simple in process and low in product energy consumption.

The invention provides a veneer which is used for fair-faced concrete building template and has the advantages of lightness, high strength, convenient disassembly and assembly, easy cutting, high cost performance, weather resistance, corrosion prevention, strong durability, easy demoulding, high turnover frequency and being suitable for industrial production. The veneer consists of a covering film, a panel and a core plate; the covering film is prepared from a resin pressed film; the panel is prepared by gluing a gum dipping fiber reinforced composite material; and the core plate is a three-layer structural plate. The invention is mainly used for panels in building template systems, particularly for panels of fair-faced concrete templates.

The invention relates to a compound sodium metaborate birefringent crystal and a preparing method and application thereof, in particular to a sodium metaborate birefringent crystal with a molecular formula of NaBO2 used in the deep-ultraviolet-infrared waveband. The chemical formula of the crystal is NaBO2, molecular weight is 65.8, the crystal belongs to a trigonal system, space group is shown in the description, and cell parameters a=11.8617angstroms, b=11.8617angstroms, c=6.3957angstroms, V=590.93 cubic angstroms, and Z=4; light-pervious range is 180-3500 nm, and birefringence is between 0.09(3500 nm) and 0.23(180 nm). Crystal growth is conducted with a high-temperature melt method or high-temperature solution method. The crystal is moderately hard and easy to process, growth is easy due to congruent melting, and birefringence is high; the crystal has a high application value in the optical and communication fields and can be used for preparing optoisolators, circulators, light beam displacers, optical polarizers or optical modulators.

The invention relates to a manufacturing method of a protection circuit for an array unit of an image sensor, which comprises the following steps: A) the process step of generating a TFT (thin-film transistor): manufacturing the pixel TFT in an active region of a glass substrate, forming an outer protection loop circuit in a non-active region of the glass substrate, and forming a signal line, a scanning line, a signal end pin electrode and a scanning end pin electrode on the glass substrate; B) the metal connection process step: using a metal material to connect the scanning end pin electrode and the signal end pin electrode with the outer protection loop circuit for forming an electrostatic discharge loop; C) the process step of generating a photosensitive diode: forming the photosensitive diode above the metal material; D) the etching process step: selectively etching the metal material between the scanning end pin electrode, the signal end pin electrode and the outer protection loop circuit; and E) the re-connection process step: using a transparent conductive material to re-connect the signal end pin electrode and the scanning end pin electrode with the outer protection loop circuit for forming the electrostatic discharge loop.

In a solder that achieves high-temperature end-solder bonding in temperature-level bonding, the connection portion between a semiconductor device and a substrate is formed by metal balls composed of Cu or the like and a compound composed of metal balls and Sn, and the metal The balls are held together by compounds.

The invention relates to an optical borate-series crystal with double refraction and application thereof. The borate-series crystal with double refraction has the chemical formula of ReBa3B9O18 (Re equals to Y, Pr, Nd, Sm, Eu, Gd, Tb, Er, Dy, Ho, Tm, Yb and / or Lu). The crystals are all uniaxial negative crystals, which have the birefringence of about 0.08 to 0.15 in the visible light band. The crystals in the series are easy to be incised, ground, polished and stored, are water immiscible, non-deliquescent and stable in air, and are suitable for being used for producing optical communication elements such as optoisolators, circulators, light beam shifters, optical polarizers and optical modulators, etc., in particular for producing polarizing prisms, phase delaying devices and electro-optical modulators with various purposes. The devices utilize the refraction index property of the optical borate-series crystal, particularly the larger birefringence (ne-no) thereof.

The invention discloses an optical fiber cable stripping device convenient for cutting. The device comprises two baffles, two supporting legs are fixedly connected to the lower surfaces of the baffles, sliding sleeves are connected to the upper surfaces of the baffles in a clamped mode, sliding rods are connected into the sliding sleeves in a sleeved mode, extrusion devices are fixedly connected to the bottom ends of the sliding rods, and the top ends of the extrusion devices are fixedly connected with the lower surfaces of the baffles. According to the optical fiber cable stripping device convenient for cutting, the electric push rod, the pressing plate, the sliding rods, the sliding sleeves, a roller, a threaded rod, a threaded cap, a first rotating shaft and a first bearing are arranged, the two cutting knives are enabled to cut into the protection layer of the cable, and a worker pulls the cable again, so that the cutting knives can more conveniently strip the cable, the worker does not need to manually strip the cable by adopting the cutting knives, the worker is not hurt, the working intensity of the worker is reduced, and the working efficiency of the worker is improved.

The invention discloses a three-dimensional orientation controllable single crystal part directional solidification starting end structure and directional solidification method for a seed crystal method, and belongs to the technical field of single crystal orientation solidification. The directional solidification starting end structure comprises a seed crystal cavity with a secondary orientationreference surface ii, a necking neck connected with the top end of the seed crystal cavity, and a cavity connected with the upper end of the necking neck; the diameter of the cylindrical seed crystalcavity is 2.5-3 times of the diameter of the necking neck, the seed crystal height is 0.5-0.8 times of the height of the seed crystal cavity, and the width of the secondary orientation reference surface is 0.6-0.8 times of the diameter of the seed crystal. According to the method disclosed by the invention, the three-dimensional orientation of a single crystal cast piece is accurately controlled by cutting cylindrical seed crystals with a secondary orientation reference surface I and at the same time controlling first and second orientation of a single crystal plate, meanwhile a reasonable seed crystal size and structural proportion are selected, and the upper end of the seed crystal is conveniently controlled to be partially melted, so that crystal growth is carried out by taking the seedcrystal as a core. The method can be used for controlling the three-dimensional orientation of the single crystal cast piece by using the seed crystal method and improving the success rate of the single crystal.

The invention relates to the touch screen technology and discloses a capacitive touch screen. A panel substrate is made from PMMA (polymethyl methacrylate) or a PC (polycarbonate) and PMMA composite material, and as the PMMA is cheaper than PC, GLASS and other materials, the production cost of the capacitive touch screen is greatly lowered. Besides, as PMMA is easy to cut but not easy to crack, the production efficiency of the capacitive touch screen is effectively improved. The structural thickness of the whole touch screen adopting the panel substrate made from PMMA or the PC and PMMA composite material is smaller than that of a conventional touch screen, the design space of the complete machine is expanded more greatly, and the touch screen adopting the panel substrate made from PMMA or the PC and PMMA composite material has the circuit induction face closer to a customer service end and the touch sensitivity quicker than that of other structures.

The invention discloses an automobile pipe cutting device. The automobile pipe cutting device comprises a rack, an air cylinder telescopic rod and a driving motor. The rack is fixedly provided with the telescopic rod and rotationally connected with a rotary barrel. The telescopic rod is connected with an annular clamping piece. An air bag is connected with the inner wall of the annular clamping piece. An air pressure valve is installed on the air bag. The outer wall of the annular clamping piece is in thread connection with the inner wall of the rotary barrel. A gear ring is fixedly arranged on the outer wall of the rotary barrel. A piston cylinder with an L-shaped section is arranged on one side of the air cylinder telescopic rod. A first piston is connected with the air cylinder telescopic rod. A second piston is connected with a cutter knife for cutting pipes. A clamping groove is formed in the cutter knife. The clamping groove is correspondingly provided with a cutting control piece. The cutting control piece can be in clamping combination with the clamping groove. The annular clamping piece triggers the cutting control piece. With the automobile pipe cutting device, the problem that according to an existing cutting device, cut automobile pipes have burrs and unsmooth cuts is particularly solved.

The invention provides a high-strength durable wood I-typed beam which has the advantages of high rigidity, lightweight, high-strength, convenient assembly and disassembly, easy cutting, high cost performance, high durability, turnover use for an average year, and industrialized production. The high-strength durable wood I-typed beam comprises a flange girth, a web plate and an end protective sleeve. The upper surface, lower surface and the interior of a flange girth substrate in the flange girth are provided with flange girth modified processing single plates. The surface and the interior of a web plate substrate in the web plate are provided with web plate modified processing single plates. The flange girth modified processing single plates and the web plate modified processing single plates are glue soaking processing single plates. The used adhesive selects water soluble phenol resin with low molecular weight or melamine-formaldehyde resin. The high-strength durable wood I-typed beam is mainly used as the supporter in a building moulding board system, and can also be used in the fields such as supporting members of building structure roofs, and the like.

The invention discloses barium magnesium cyanurate birefringent crystals for ultraviolet visible wavebands and a preparation method and application of the crystals. The chemical formula is Ba2Mg(C3N3O3)2 and belongs to a trigonal system, and the space group and unit-cell parameters are shown in the descriptions. The crystals grow by means of a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. The barium magnesium cyanurate birefringent crystals obtained by means of the method are uniaxial negative crystals, the transmission range is 230-3,000 nm, and the calculation values of the refractive indexes at the place where lambda is equal to 800 nm are as follow:no is equal to 2.00, ne is equal to 1.649, and deltan is equal to 0.351. The crystals easily grow and are easy to cut, grind, polish and store, stable in air, uneasy to deliquesce and insoluble in water; the crystals can be used for manufacturing Glan prisms, Wollaston prisms, Rochon prisms orbeam splitting polarization device or other polarization beam splitting prisms and have important application in the field of optics and communications.