62results about How to "Experimental repeatability is strong" patented technology

The invention discloses a preparation method for sodium alginate-acrylamide-based hydrogel. The preparation method comprises the following steps of: dissolving sodium alginate powder in deionized water; then sequentially adding an acrylamide monomer, a methylene diacrylamide cross-linking agent, ammonium persulfate and an N,N,N',N'-tetramethylethylenediamine catalyst; uniformly stirring the materials, pouring the mixture into a glass die, and heating the mixture to obtain a hydrogel; completely soaking the hydrogel in a 0.01-1 mol / L non-monovalent cation aqueous solution for 1-10 hours, wherein cations diffuse and enter in a hydrogel network structure, and induce sodium alginate to cross-link, so as to generate the high-strength and high-toughness sodium alginate-acrylamide-based hydrogel during the process. The hydrogel disclosed by the invention has the following performances: the highest tensile strength can achieve 1 MPa, and the highest tensile elasticity modulus can achieve 250 KPa; a loading-unloading test is performed on the hydrogel, and when the great tensile multiple before unloading is 8, the highest dissipated energy can achieve 2180 KJ / m<3>.

The invention discloses transparent nanometer zirconium dioxide liquid phase dispersoid, and a preparation method and application thereof. The dispersoid comprises liquid phase media and nanometer zirconium dioxide particles, wherein the nanometer zirconium dioxide particles are uniformly dispersed into liquid phase media; the solid content of the dispersoid is 1 weight percent to 50 weight percent; the one-dimensional dimension of the nanometer zirconium dioxide particles is 1 to 12nm; the liquid phase media are water, organic solvents, a mixture of water-soluble organic solvents and water, or a mixture of different organic solvents. The nanometer zirconium dioxide in the product has high crystallinity degree; the particle diameter is small; the distribution is uniform; any surfactant is not contained; the purity is high; the dispersion effect is good; no sedimentation occurs after the still standing for 6 months or longer. The product prepared by the method does not need any treatment, and is directly the transparent nanometer zirconium dioxide liquid phase dispersoid; any substance does not need to be added for dispersion assistance; the problems of easy agglomeration, poor dispersibility and poor optical performance of the composite material are solved; higher application performance and wider application ranges are given to the product.

The invention discloses a preparation method of calcium phosphate nanopowder with a controllable length-to-diameter ratio and calcium-to-phosphorus ratio. The method comprises the step: carrying out areaction by mixing phosphate or phosphoric acid with a calcium salt to prepare the calcium phosphate nanopowder, wherein the one-dimensional size of a calcium phosphate nanoparticle can be regulatedto be 50nm-5mu m and the length-to-diameter ratio can be regulated to be 2-50 by adding a pH regulator into a reactant, components and proportions of the calcium phosphate nanopowder serving as a product can be regulated by controlling the feeding ratio of the phosphate or phosphoric acid to the calcium salt to be 1.5-1.67, and the calcium phosphate nanopowder is beta-tricalcium phosphate and / or hydroxyapatite. According to the method disclosed by the invention, the length-to-diameter ratio of the product is regulated by controlling the proportion of weak bases and relatively strong bases in the pH regulator; the calcium-to-phosphorus ratio of the product is controlled by changing the feeding ratio of a calcium source to a phosphorus source; a supergravity technology is combined to enhancea micromixing effect, so that the calcium phosphate nanopowder is prepared; and the preparation method is low in production cost, simple in operation, good in repeatability, better in application performance and wider in application range.

The invention discloses an experimental device and method for evaluating formation and aggregation behaviors of hydrate in deepwater drilling. The experimental method comprises a high-pressure reaction kettle, a high / low-temperature incubator, a gas control system, a return pressure unloading system and a data acquisition system, wherein a middle barrier and a side barrier are arranged in the inner cavity of the high-temperature reaction kettle; a fluid flowing channel is formed in one side of the side barrier; an air inlet and an air outlet are formed in the top of the high-pressure reaction kettle; a lower air inlet is formed in the bottom of the high-pressure reaction kettle; both the upper air inlet and the lower air inlet are connected with the gas control system; the air outlet is connected with the return pressure unloading system. The experimental device aims at drilling fluid systems of natural gas hydrate stratum drilling, frozen earth drilling and ocean drilling, the process that decomposition gases or shallow gases of hydrate in drillings or stratums enter shaft annuluses to form hydrate can be simulated, and furthermore the influence of annulus circulation channels upon formation and aggregation behaviors of the hydrate and the capability of drilling fluid upon the formation and aggregation behaviors of the hydrate can be evaluated and simulated.

The invention discloses an aspirin crystal, a crystallization method and application thereof. In the present invention, water-soluble polymer additives are added to the crystallization system, the ideal morphology of aspirin is obtained through molecular simulation, and the molecular arrangement of the (0 1 1) crystal plane is obtained by cutting, and it is found that the (0 1 1) crystal plane is composed of exposed hydroxyl groups, The carbonyl group and the oxygen atom in the ester group are easy to interact with polyvinylpyrrolidone to form hydrogen bonds and form strong adsorption. In addition, polyvinylpyrrolidone and vinylpyrrolidone-vinyl acetate copolymers have relatively large molecular weights and will not intercalate crystals. cells become impurities. The obtained product particles have small aspect ratio, good fluidity, high bulk density, high yield and up to standard impurity content. Strong repeatability, little interference from external factors, especially suitable for industrial production.

The invention discloses a strengthened boiling heat transfer testing device and a testing method. The testing device comprises a condenser, a main container, a base and a heater, wherein the condenser is communicated with the main container, and the main container is arranged on a base; the main container comprises a glass container, screw rods, an upper cover plate covered on the top end of the glass container and a lower cover plate covered on the bottom end of the glass container, wherein the upper and lower cover plates respectively have through holes, the screw rods pass through the through holes of the upper and lower cover plates and are fixed with the upper and lower cover plates; the base comprises a ceramic base arranged in the base; the heater comprises a main heater and an auxiliary heater, the main heater is positioned on the middle position of the base, arranged on the ceramic base and is fixed with the through hole of the lower cover plate; the auxiliary heater is positioned in the main container and is arranged on the lower cover plate. The testing device and the testing method provided by the invention have the advantages that a sample is flexible to replace, the operation is convenient, the boiling state under high heat flux density is measured, testing effects in boiling under different structures are compared, and the test result is stable and reliable.

This invention discloses a method for preparing high-Nb Ti-Al alloy by discharge plasma sintering. The method comprises: loading element mixed powder alloy powder into a graphite mold, placing in a discharge plasma-sintering furnace, applying an axial pressure of 10-80 MPa, heating at a rate of 50-800 deg.C / min in 10-2-6 Pa vacuum or inert atmosphere, sintering at 900-1400 deg.C, keeping the temperature, and cooling to room temperature to obtain high-Nb Ti-Al alloy blocks. The method can prepare highly compact high-Nb Ti-Al alloy blocks with uniform composition and high performance in a short time and at a low sintering temperature. Besides, the method also has such advantages as low energy consumption, little pollution, easy operation and good repeatability.

The invention discloses an automatic electric-control gravity-type striker for constructing an acute spinal cord injury animal model, which is characterized in that the striker comprises a base, a support, a transverse beam, an electromagnetic striker and a control box used for controlling the electromagnetic striker to act; the support is vertically arranged on the base, a vertical guide rail is arranged on the support, the transverse beam is arranged on the vertical guide rail, and a transverse beam height adjusting mechanism which is used for driving the transverse beam to slide on the guide rail and locking the transverse beam on the guide rail is arranged on the transverse beam; and the electromagnetic striker is fixed at one end of the transverse beam. The automatic electric-control gravity-type striker for constructing the acute spinal cord injury animal model has the advantages that the operability is high and the secondary strike can be effectively avoided.

The invention relates to a Schottky diode based on indium aluminum zinc oxide and a preparation method thereof. The diode structure includes SiO arranged sequentially from bottom to top 2 / P + ‑Si substrate, metal electrode Ti, IAZO film and double-layer metal electrode Pd, double-layer metal electrode Pd includes the first layer metal electrode Pd and the second layer metal electrode Pd arranged in sequence from bottom to top, IAZO film and metal electrode The Ti is an ohmic contact, and the IAZO film and the double-layer metal electrode Pd are a Schottky contact. The present invention designs a kind of IAZO SBD with Schottky contact on the top for the first time. IAZO has a very wide forbidden band width and a wide range of bandgap modulation, which is beneficial to ensure the light stability of IAZO SBD device performance; the SBD has better Excellent electrical properties, can be prepared at low temperature, suitable for industrial production.