227results about How to "Avoid complex processes" patented technology

The invention discloses a method used for the preparation of microcrystalline glass by use of blast furnace slag, wherein blast furnace slag is crushed and sifted out and then is mixed with 0 to 10 wt percent of feldspar and 0 to 5 wt percent of zirconite to make mixed powder material with the weight proportion of blast furnace slag no less than 85 percent; then, the mixed powder material is made into slurry through ball milling mixing and agglomerant is added in after the slurry is dried to complete granulation; and finally, microcrystalline glass is made through direct tabletting crystallizing sintering. The method has the advantages that: (1) ironmaking blast furnace slag is adopted as main material with the addition amount of the blast furnace slag reaching more than 85 percent, which not only saves resources and reduces pollution, but also realizes cycle economy; (2) cheap silicate materials including zirconite and feldspar are adopted as additives; (3) powder tabletting sintering method is adopted to make microcrystalline glass, thereby omitting the complex process of casting moulding after high-temperature fusion of glass or sintering after fusion water quench in the prior glass process and sintering process.

The invention discloses a cellular denitration catalyst regenerating solution for a coal fired power plant and a regenerating method thereof. The regenerating solution comprises a cleaning solution and an activated replenishing solution, wherein the cleaning solution contains H2SO4 and an emulsifying agent S-185; the activated replenishing solution contains VOSO4 and ammonium paratungstate; and ultrasonic cleaning is adopted in the cleaning method. The regenerated catalyst has relative activity (K / Ko) of 0.95-0.99 and SO2 / SO3 conversion rates of both less than 1 percent and meets the requirement on the engineering; and the regenerating process is simple in operation and is suitable for industrialized massive regeneration.

The invention provides a method for preparing nano porous materials with a large specific surface area by a vacuum freeze drying method with short period, simple process and non environmental pollution, which comprises the following steps: (1) taking an organosilane presursor or metal alkoxide as a raw material to synthesize wet gel; (2) allowing the wet gel to stand for 1 to 7 days, and performing aging on the wet gel; (3) using ethanol to clean the wet gel for 1 to 2 days; (4) adding a modifier into the wet gel for soakage for 1 to 2 days, performing solvent displacement, and modifying a three-dimensional network structure of the wet gel; and (5) placing the obtained product into a freeze drying box for prefreezing and vacuum drying. The method is to adopt a novel drying method, namely the vacuum freeze drying method, to dry the wet gel on the premise of maintaining the structure of the wet gel. The drying method has short period and simple process, avoids environmental pollution, cannot damage the network structure of the gel, reduces the production cost, and accelerates the large-scale commercialized application process of nano porous super heat-insulating materials, catalysts and catalyst carrier materials.

The invention provides a composite material which comprises the following components in parts by weight: 90-110 parts of rubber, 1-15 parts of nanometer titanium dioxide, 2-20 parts of glass fiber, 5-30 parts of ultra-high molecular weight polyethylene, 2-20 parts of polytetrafluoroethylene, 5-40 parts of nanometer silicon carbide, 0.5-5 parts of peroxide initiator, 4-30 parts of cross-linking agent, 0-15 parts of molybdenum disulfide, 0-15 parts of graphite, 0-10 parts of zinc oxide, and 0-10 parts of potassium hexatitanate. The invention further provides a preparation method of the composite material. The nanometer titanium dioxide, the nanometer silicon carbide, the polytetrafluoroethylene and the ultra-high molecular weight polyethylene are added in the composite material and form a crystallographic and covalent cross-linking composite material with the rubber through a cross-linking effect of the peroxide initiator and the cross-linking agent.

The present invention discloses a silicon MEMS piezoresistive acceleration sensor which belongs to the art of micro-mechanical sensors. The present invention comprises a silicon frame, a quality block, a torsion girder, a sensitive girder and a voltage dependent resistor; wherein, the left and the right sides of the quality block are provided with sensitive girders in symmetry which are connected with the silicon frame, and the end part on the upper surface of the sensitive girder is provided with the voltage dependent resistor; the front and the rear sides of the quality block are provided with a pair of symmetrical torsion girders which are connected with the silicon frame, the height of the quality block is vertically higher than that of the sensitive girder. The piezoresistive acceleration sensor provided by the present invention is a micro sensor using the voltage dependent resistor that is arranged on the upper surface of the structure to test the lateral acceleration signal; can avoid the sophisticated technique making the voltage dependent resistor on the profile of the structure; reduces the difficulty of processing; improves the accuracy, consistency and good yield of resistor processing; and easily realizes three-axial integration. The sensor has the advantages of small body, light weight, small crossover coupling, high reliability, low cost and easy combination.

The invention discloses a high temperature anti-oxidation coating molybdenum material and a preparation method thereof. The surface of a product is provided with a Mo-N-Si-B anti-oxidation coating which is synthesized by adopting a three-step in situ synthesis method. Compared with the prior art, the product has good high temperature anti-oxidation performance and is good in material compactness, and hot matching performance between the coating and a base body is good. The preparation method does not need expensive devices such as plasma spraying, chemical vapor deposition or infiltration, avoids a complex process of a slurry method and is simple in preparation process, low in production cost and easy in controlling of coating structures and phase states.

The invention provides a construction method for forming a folding fan-shaped hyperboloidal unit-type building curtain wall by fitting plane unit body plates. The method mainly comprises the following steps of: dividing a hyperboloidal curtain wall into a plurality of units; performing a conversion of plane unit bodies on full curtain wall unit bodies; manufacturing unit bodies according to the converted plane unit bodies; and installing the unit bodies in a curtain wall structural system to form a curved surface by a cold twisting method. By using the construction method, complex processes for manufacturing panel unit bodies of the curved surface are avoided; and the plate unit bodies are molded into a hyperboloidal unit body in a structural system by cold twisting in installation, so that the defects of clear edges and corners and undesirable curved surface effect caused by forming the hyperboloidal curtain wall by using plate unit bodies in the prior art are overcome. The curved surface intent of the folding fan-shaped hyperboloidal unit-type building curtain wall of an architect is fully shown; and the guarantee of a method and a structure is provided. The invention also discloses the folding fan-shaped hyperboloidal unit-type building curtain wall system.

An antibacterial hydrophilic polyurethane foam medical dressing is prepared by mixing a component A and a component B according to a mass ratio of 0.5-1 to 3-1 and foaming, wherein the component A isan isocyanate terminated hydrophilic prepolymer; the component B is a functional foaming mixture formed by mixing 1-10% of a surfactant, 0.9-10% of a foam stabilizer, 0.1-10% of a cationic polymeric antibacterial agent and 70-98% of water. The antibacterial hydrophilic polyurethane foam medical dressing has the characteristics of simple preparation technology and strong operability. The prepared antibacterial hydrophilic polyurethane foam medical dressing has a good antibacterial property, maintains the antibacterial property thereof for a long time, has a good hydrophilic liquid-absorbing property and is a novel functional medical wound dressing.

The invention provides a rolling friction cylinder hydraulic type force standard machine which belongs to the technical field of mechanical engineering. The main body of the hydraulic type force standard machine consists of a rolling friction plunger type hydraulic cylinder I used as the core and a communicating vessel formed by two rolling friction plunger type hydraulic cylinders according to the Pascal principle. The complete hydraulic type force standard machine also comprises a force measuring instrument, a frame, a rolling friction cylinder II, a displacement sensor, a counterweight, a hydraulic oil feeding system and a hydraulic subsidiary loop. The force standard machine has high working precision; oil cylinder structure and the manufacturing process are simplified; the loading time can be efficiently controlled in the working process; the high pressure hydraulic pump is unnecessary; no pressure and flow pulsation phenomenon exists; the flow control is precise and stable; the minimum stable flow requirement can be met by controlling the precise displacement of plungers; and the stable and accurate system working pressure is maintained.

The invention relates to an active carbon-silicon aerogel complex and a preparation method thereof, and belongs to the field of removal of volatile organic pollutants. The active carbon-silicon aerogel complex is prepared from active carbon granules serving as a skeleton structure and water glass serving as a silicon aerogel precursor by sol-gel reaction and normal-pressure drying. The active carbon-silicon aerogel complex is prepared from cheap raw materials, has a multistage pore structure, and is favorable for improving the adsorption quantity of volatile organic compounds (VOCs), reducingthe mass transfer resistance and improving the desorption efficiency.

The invention discloses a regenerated cellulose fiber and a preparation method thereof. The regenerated cellulose fiber takes waste newspaper with ink, office paper, kraft paper or cardboard paper and the like as raw materials, after ultrasonic treatment, the raw materials are mixed with filler, a surfactant, a waterproof agent and special coating according to a certain proportion so as to prepare the regenerated cellulose fiber. The preparation method comprises the following steps of defibering the raw material waste paper by a high energy aquapulper and then screening to remove dregs, after ultrasonic treatment on the purified sizing agent, mixing with mixed filler uniformly, slowly stoving at above 60 DEG C so as to obtain oven dry stock, ball milling and dispersing the oven dry stock so as to obtain villiform monofilament fiber, adding nano TiO2 coating through a dry method in the process so as to obtain the regenerated cellulose fiber product.

The invention discloses a preparation method of methyl phenyl hydrogen-containing silicone oil for LED packaging adhesive. The method takes methyl phenyl dimethoxy silaneas raw material and hydrochloric acid or acid cationic resin as catalyst, and performs hydrolytic condensation reaction under the heating and stirring condition, and prepares methyl phenyl hydroxyl silicone oil; the prepared methyl phenyl hydrogen-containing silicone oil and tetramethyl tetralin cyclotetrasiloxane (D4H) as raw materials, hexamethyl disiloxane (MM) or hydrogen-containing dual-sealing end (MMH) as the end-capping reagent, and acid cationic resin as the catalyst; the reaction is carried out under the heating and stirring conditions; after finishing the reaction, catalyst is filtered and removed; and then the methyl phenyl hydrogen-containing silicone oil is obtained after depressurizing and distilling the product and removing the low-boiling-point substance. The prepared hydrogen-containing silicone oil is colorless and transparent thick fluid; the light transmittance, refractive index and activated hydrogen content are high, the thermal stability is good; besides, the methyl phenyl hydrogen-containing silicone oil can be used as the LED packaging material.

The invention is concerned with devices structure of single mode quantum cascade laser. It relates to one N type InP underlay, one N type InGaAs lower wave-guide layer made on N type InP underlay, 35 cycle InGaAs / InAlAs commutative active layer on the lower wave-guide layer, one N type InGaAs upper wave-guide layer on active layer, one N type InAlAs upper cladding on the N type InGaAs upper wave-guide layer, one N type InGaAs high doping contact layer on N type InAlAs upper cladding, one N type InGaAs ohm contact layer on N type InGaAs high doping contact layer, one SiO2 dielectric layer on the upper surface and sidewall in type of double grooves of whole material, and the SiO2 dielectric layer is separate to form current injecting window, one frontispiece N type electrode made on the SiO2 dielectric layer and one rear N type electrode made on the back of N type InP underlay.

The invention discloses a satellite-remote sensor flexible heat sinking joint, which belongs to the field of spatial remote sensor optical instruments using a satellite as a carrier. The satellite-remote sensor flexible heat sinking joint comprises a first supporting rod, a second supporting rod and a plurality of unloading grooves such as an unloading groove a, an unloading groove b and the like. The unloading groove a and an unloading groove d are positioned on the first supporting rod and are mutually parallel; the unloading groove b and an unloading groove c are positioned on the first supporting rod, are mutually parallel, and are mutually perpendicular to the unloading groove a and the unloading groove d; an unloading groove e and an unloading groove h are positioned on the first supporting rod and are mutually parallel; an unloading groove f and an unloading groove g are positioned on the first supporting rod, are mutually parallel, and are mutually perpendicular to the unloading groove e and the unloading groove h; the first supporting rod and the second supporting rod are arranged triangularly; and the unloading grooves on the second supporting rod are fully symmetrical with the unloading grooves on the first supporting rod. When a large spatial remote sensor is assembled and positioned, the system stability is optimal, and the satellite-remote sensor flexible heat sinking joint has higher vibration resistance. A stress environment in a working process is improved, so that the remote sensor is in a favorable working condition, and the imaging quality is guaranteed.

A power-down control conversion circuit comprises an MCU single chip machine control circuit, a commercial power input sampling circuit, a bypass static switch and an inverting static switch. The MCU single chip machine control circuit outputs a bypass control signal to control the conduction and the cut-off of the bypass static switch installed between a commercial power input end and an alternating current output end, and also outputs an inverting control signal to control the conduction and the cut-off of the inverting static switch installed between a UPS inverter and an alternating current input end, and then inputs a sampling signal of the commercial power input sampling circuit; and the circuit is characterized in that the commercial power input sampling circuit comprises a commercial power input sine wave amplitude sampling circuit and a commercial power input sine wave frequency sampling circuit; accordingly, the sampling signal comprises an amplitude sampling signal and a frequency sampling signal. The invention realizes the detection of inputting super high speed short power-down through dual sampling method of measuring the amplitude and the frequency of the input voltage waveform simultaneously, and has the characteristics of simple technique, stable circuit performance and low cost.

The invention provides itraconazole nanocrystals and a preparation method and application thereof. Acid phase in which itraconazole is dissolved is dropwise added into alkaline phase to over-saturate the itraconazole; the itraconazole molecules are aggregated into amorphous nanocrystalline particles in the presence of a high molecular stabilizer to form a stable structure with itraconazole nanocrystals as a core and the high molecular stabilizer as a shell; and both the solubility and the dissolution rate of the itraconazole nanocrystals are greatly improved compared with those of normal itraconazole nanoparticle suspension. A hydrophilic fragment of the high molecular stabilizer, which is extended into the water, improves the hydrophobicity of the surfaces of the itraconazole nanoparticles, so that the high molecular stabilizer is more easily moistened and dissolved; and the high molecular stabilizer serving as the shell enhances the adhesion between the medicament particles and gastrointestinal mucous membrane, is favorable for improving the bioavailability and reduces the influence of a diet state on the bioavailability. The method of the invention has the advantages of no use of toxic solvent, simple preparation process, low cost and easy industrialization.

The invention provides a preparation method of 2,2-dimethyl-3-hydroxypropanal and application thereof in preparation of neopentyl glycol. The 2,2-dimethyl-3-hydroxypropanal is prepared from an epoxy compound by a hydroformylation method. The method has the advantages of good atom economy, low raw material cost, no wastewater generation, and high yield. The invention also provides the application of the 2,2-dimethyl-3-hydroxypropanal in preparation of the neopentyl glycol. The application method circumvents the disadvantages of the conventional methods in the prior art, the reaction system is simple, and the industrial application prospect is excellent.

The invention relates to the field of a medical treatment device, and is used for the design of an operation replacement piece of an artificial knee; the invention particularly discloses a design method of customized artificial knee joint prosthesis. The design method solves the technical problems of discontinuous curve curvature of thighbone vertical plane condyle, weak rolling ability and poor stability in the knee joint prosthesis at present. A design method of customized artificial knee joint prosthesis, wherein the design method includes steps of (1), fitting first vertical plane fitting ellipses of two condyles of the thighbone through a CT image of the thighbone tail end of a patient; (2), acquiring coronal plane fitting ellipses of two condyles of the thighbone through the CT image of the thighbone tail end of the patient; (3), according to the dimension of minor semi-axes of the coronal plane fitting ellipses of two condyles of the thighbone, acquiring second vertical plane fitting ellipses of two condyles of the thighbone, wherein L is equal to the length of minor semi-axes of the coronal plane fitting ellipses; (4), scanning the coronal plane fitting ellipses of two condyles of the thighbone along the corresponding second vertical plane fitting ellipses and forming a smooth curve face of the femoral condyle, and further forming a two-condyle structure at the tail end of the thighbone.

The invention discloses a polycarbonate resin compound and a preparation method thereof. The polycarbonate resin compound comprises the following components: 80 to 99.5 portions by weight of polycarbonate resin or polycarbonate resin alloy, and 0.5 to 20 portions by weight of organic silicon rubber. The preparation method comprises the following steps: (1) premixing, namely, adding the polycarbonate resin or the polycarbonate resin alloy and the organic silicon rubber into a mixer, and premixing the materials for 1 to 6 minutes with the rotating speed of 100 to 800 revolutions per minute at the mixing temperature of between 20 and 50 DEG C; and (2) squeezing granulation, namely adding the premixed materials into a double-screw extruder to carry out squeezing granulation, wherein the temperature of each section of the double-screw extruder is between 180 and 300 DEG C during extrusion, the rotating speed of screws is 100 to 500 revolutions per minute, and the rotating speed of a feeder is 10 to 60 revolutions per minute. The polycarbonate resin compound prepared by the method has good liquidity, thermal stability and impact resistance, and belongs to the field of polymer material modification.

The invention relates to a preparation method of the cationic dyeable halogen-free flame retardant polyester fiber, which comprises the following process steps: 1. adding monosodium isophthalic sulfonate, 2-propyloic hypophosphorous acid and de-ionized water into a reaction container, filtering out reaction products after the reaction is completed, and carrying out baking to obtain cationic dyeable flame retardant compounds; 2. adding terephthalic acid, products in the first step and glycol into an esterification kettle, then, adding antimony ethylene glycalate, conducting the materials into a polycondensation kettle, and carrying out reaction and material outlet to obtain cationic dyeable flame retardant polyester slices; and 3. drying the cationic dyeable flame retardant polyester slices prepared in the second step through a vacuum drum drying machine, carrying out spinning on the dried slices on a spinning machine according to a conventional polyester spinning process to obtain the cationic dyeable halogen-free flame retardant polyester fiber. The invention realizes the flame retardant performance and the cationic dyeable performance of the polyester through one-step addition, avoids the complicated process and the occurrence of various kinds of secondary reaction caused by a traditional method of adding flame retardant agents and cationic dyeable auxiliary agents in two steps, and has more stable and obvious flame retardant and cationic dyeable effect.

The invention discloses a method for increasing the open circuit voltage of a solar cell based on an additive, which takes a solar cell containing a perovskite material as an object, in particular, doping an additive into the perovskite material of the solar cell, wherein the additive is an additive containing guanidine ion and halogen ion. The invention improves the specific kinds of additives and the like, Guanidine hydrochloride or guanidine iodate are use as additives, Compared with the prior art, the invention can effectively improve the open-circuit voltage of the solar cell by introducing an additive into the perovskite material in the solar cell, thereby passivating the internal defects of the device, reducing the carrier loss and effectively improving the open-circuit voltage of the perovskite solar cell. The invention has the advantages of simple process, low cost, friendly environment, high practical value, and the highest open circuit voltage of 1.02 V can be obtained.

The invention belongs to the technical field of primary lithium batteries, and discloses a method for preparing electrolyte for a lithium-ferrous disulfide battery by a one-step method. The method comprises the following steps: in inert atmosphere, adding elemental iodine into an organic solvent and stirring the organic solvent evenly at 0-5 DEG C; adding lithium aluminum hydride or lithium hydride and carrying out stirring reaction for 1-2 hours; heating the mixture to 40-60 DEG C and carrying out stirring reaction for 1-2 hours; and centrifuging and filtering the mixture to obtain the electrolyte for the lithium-ferrous disulfide battery. According to the preparation method, the electrolyte for the lithium-ferrous disulfide battery is synthesized by the one-step method; and no water is introduced in the entire preparation process, so that the cost is relatively low; and the lithium-ferrous disulfide battery prepared from the electrolyte prepared by the method is good in property.

The invention a short rod-like and peony-like lead sulfide nano-structure material and a preparation method thereof, belonging to the technical field of nano materials. The preparation method of the short rod-like and peony-like lead sulfide nano-structure material comprises the following steps of: preparing lead sulfide nano materials by directly taking biological nano-structure DNA as a template; sufficiently mixing a DNA solution with the concentration of 1-2mg / mL and a lead nitrate solution with the concentration of 50mM; then carrying out water bath heating to achieve 35-45 DEG C, simultaneously adding a thioacetamide solution with the concentration of 0.4 M, and stirring at low speed; heating to 70 DEG C, and keeping for 5-10 minutes; cooling, then washing and centrifuging to extract sediments, and carrying out drying treatment so as to obtain a lead sulfide nano-structure taking the DNA as the template. The invention directly takes the large biological molecule DNA as the template; the bionic mineralization method has the advantages of easy operation, moderate preparation condition, uniform appearance, can regulate and control the mineral crystal nucleation process through biological molecules, controls the appearance and the structure of a PbS crystal and has unique superiority in the growth research of the PbS crystal.

The invention relates to an in-situ-growth-based method for preparing nickel hydroxide-nickel oxide film electrode. The method comprises: cleaning, dedusting, rust removing, and oil removing are carried out on a metallic nickel substrate to obtain a clean nickel surface; preparation of an alkaline electrolyte is carried out, wherein the main raw material is KOH or NaOH alkali metal and the concentration is 5-300g / L and the auxiliary raw material is one of hydrogen peroxide, ammoniacal liquor, sodium carbonate, sodium oxalate, urea, and glycol and the concentration is 1-20g / L; the electrolyte is placed in an reaction still and the clean nickel substrate is immersed into the electrolyte; the reaction still is placed in a muffle furnace to carry out hydrothermal reaction for 1 to 96 houses at the temperature of 120 to 250 DEG C, so that oxidation reaction is carried out on the metallic nickel surface; and then the metallic nickel is taken out after water heating and is cleaned and dried, thereby obtaining the nickel hydroxide-nickel oxide film electrode prepared based on in-situ growth. The preparation method has advantages of simple process, low price of raw materials, easy operation, and low production price; the thickness of the prepared film material can be controlled; and the activity is high. The method is suitable for industrial large-scale production.

The invention relates to a power and light dual responses type self-assembly body based on dual flurophore and a preparing method thereof. By using spiropyrane and naphthalimides of the dual fluorophore, a molecular self-assembly body of which the morphology of molecular self-assembly can be adjusted and controlled is obtained through amidation. The molecular self-assembly body can be a power-induced fluorescent color material and has the advantages of being easy to erase, being able to return to an original state through a way of heating, and having good repeatability. Meanwhile, the self-assembly body has a light-induced fluorescent color performance, and the fluorescent maximum emission wavelength of the self-assembly body under the stimulation of mechanical force has a certain degree of red shift compared with light-induced fluorescent maximum emission wavelength, thus under the effect of the mechanical force, the assembly morphology of the self-assembly body can achieve the transformation from a fibrous shape to a globular shape. The self-assembly body is simple and convenient in preparing method, and can promote the applications of power-induced fluorescent color materials in practice.

The invention relates to a carbon fiber opening fixture frame and a preparation method thereof. The opening fixture frame is formed by assembling a plurality of molded carbon fiber tubes and a plurality of molded carbon fiber joints according to the structural form of an opening fixture. According to the method, a traditional complicated process of winding paste resin bonding fibers is avoided, the connection accuracy is improved, the processing steps are simplified, the production cycle is shortened, and the working efficiency is improved; meanwhile, the used carbon fiber joints adopt a mold molding technology, so that integrated molding can be achieved; and the connection mode of the carbon fiber tubes and the carbon fiber joints is inner buckling connection, so that the occluding strength and stability of the joints and the carbon fiber tubes can be increased, and the appearance problem of connection can also be solved.

The invention discloses a synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles, relating to the technical field of nanomaterials. The method comprises the following steps of: 1) adding an iron salt solution comprising ferrous chloride and ferric trichloride according to the volume ratio of 1: 10 into a NaOH solution, stirring, collecting produced black precipitates by a magnet, washing with water for three times to obtain fresh ferroferric oxide nanoparticles, dissolving in a nitric acid solution, heating and stirring till complete oxidation of gamma-Fe2O3, performing centrifugal collection after the solution is cooled, and washing with the water to obtain the ferric oxide nanoparticles of 3-6nm; and 2) diluting with the water till 1.1mM, adding sodium citrate, stirring, and alternately adding hydroxylamine hydrochloride and 1% of chloroauric acid for five times sequentially. The synthesis method has the beneficial effects that the method is simple to operate, the preparation conditions are mild, and the complex process of a conventional preparation method is avoided. Compared with single ferric oxide nanoparticles, the small core gold-coated ferric oxide core-shell structure nanoparticles have not only various properties of the ferric oxide nanoparticles, but also higher stability in comparison with the ferric oxide nanoparticles, and are widely applied to biological imaging, biosensing, biological identification and surface-enhanced Raman technologies.

The invention discloses a board double-end corner sawing machine. The board double-end corner sawing machine comprises a machine base, a left bracket, a right bracket and parallel guide rails, wherein the left bracket and the right bracket are arranged on both sides of the machine base; the parallel guide rails are arranged on the inner sides of the left bracket and the right bracket; a workbench and a hydraulic air cylinder at the lower end of the workbench are arranged between the left bracket and the right bracket; and a left corner sawing device and a right corner sawing device are symmetrically arranged on the machine base. Due to the adoption of the technical scheme, the corners or the edges of boards can be machined once by setting the included angle between two circular saw blades, the boards can be machined into angles at any degrees generally, and the conventional complicated process of machining for more than two times is prevented, so that the board double-end corner sawing machine improves the work efficiency, is easy to operate, has high machining accuracy, is safe and reliable, reduces the cost and ensures the machining quality of products.

The invention discloses an X-ray source for wide-field X-ray phase-contrast imaging. The X-ray source comprises an electronic source for emitting electronic beams and an anode target for emitting X rays in response to incidence of the electronic beams, wherein the anode target is an integrated column body; an emission surface is formed at the top end of the anode target and consists of a plurality of stepwise distributed oblique emission surface units which are parallel to each other; the included angle alpha between the emission surface of the anode target and the inter-step side wall between the adjacent emission surface units is 50-120 degrees; and the included angle beta between the inter-step side wall and a principal optic axis of the emission surface of the anode target is not less than 90 degrees. The X-ray source for wide-field X-ray phase-contrast imaging can be applied to wide-field X-ray phase-contrast imaging, can overcome the field limitation of an anode of an array structure, and is low in manufacturing cost and simple and reliable in manufacturing process.