49results about How to "Technical parameters are easy to control" patented technology

The invention relates to a method for preparing a porous bone scaffold by laser and increasing mechanical and biological performances of the porous bone scaffold by adding zinc oxide with little amount, which belongs to the bone tissue engineering field. Aiming at uncontrollable performances of aperture distribution, shape, space direction and connectivity in the preparation method of a traditional bone scaffold, and aiming at the disadvantages of poor mechanical property and fast resolving rate existed in tricalcium phosphate (beta-TCP), the invention provides the method for preparing the porous bone scaffold by using a selective laser sintering (SLS) technology, and provides the method for increasing performance by adding zinc oxide (ZnO). The method for preparing the porous bone scaffold has the advantages that the porous scaffold which enables three-dimensional interconnection is prepared by SLS, zinc oxide with little amount is added for introducing into a liquid phase, the particles densification can be promoted, crystal grain is refined, and the mechanical performance is improved, simultaneously, cell compatibility is increased, the degradation rate is reduced, and the biological performance is increased, so that the interconnected porous beta-TCP bone scaffold with enhanced mechanical performance and good biological performance can be finally prepared. The method has the advantages of simple preparation technology, convenient operation, low cost, easy control of technical parameter and the like.

The invention discloses a smoked bovine extract and its application in the preparation of anticonvulsants. The smoked cow extract can significantly reduce the number of convulsions / convulsion rate in mice, significantly shorten the duration of convulsions in mice, significantly prolong the latency period of convulsions, has a good anticonvulsant effect, and can prevent / treat febrile convulsions, convulsions, convulsions, etc. symptom. The smoked bovine extract provided by the invention has broad application prospects in the preparation of safe and highly active anticonvulsant drugs.

The invention relates to a production process of a freon resistant, double glass fiber covered enamelled wire, which solves problems of lag in an existing production process of glass fiber covered enamelled wires, large waste of raw materials, high energy consumption, environmental pollution and quality instability. The production process ensures quality of finished products and work efficiency by the following steps: strictly selecting the raw materials, taking the raw materials into a softening furnace for solidifying treatment by freon resistant insulating impregnating varnish; covering with conductor glass fiber, wherein, two layers of the glass fiber are covered in reverse directions to prevent single cladding; and controlling temperature of a baking furnace and the like. The production process has rational design, simple process, low manufacturing cost, low operating cost, reliable work, high efficiency, stable quality and strong workability, can help manufacture a plurality of different single and double glass fiber, paper covered and enamelled flat copper wires, round copper wires and irregular copper wires, and various electromagnetic wires for different uses, and the production process has wide market prospect.

The invention discloses a method for preparing 4A zeolite by using fluorine-containing white residues through single-step crystallization. The method comprises the following specific steps of: simultaneously adding a sodium metaaluminate solution, a NaOH solution and a 4A zeolite crystallization guiding agent to the fluorine-containing white residues generated in a fluorine salt production process of aluminum and fluoride chemical industries according to a certain proportion, uniformly mixing in a reaction kettle, carrying out constant temperature crystallization for 3.0-3.5 hours at 75-85 DEG C and a stirring rate of 240-300r / min, ageing for 12-14 hours, filtering, washing and drying to obtain the 4A zeolite which is used for washing and is in line with the QB / I1768-2003 standard. The method has the technical characteristics that technological process is short, synthetic conditions are mild, the product quality is stable, and the problems of comprehensive utilization of the fluorine-containing white residues and secondary pollution of the fluorine-containing white residues to environments are successfully solved.

The invention relates to method for reinforcing and toughening an akermanite bone scaffold by utilization of nano titanium oxide power and for preparing a three-dimensional porous ceramic bone scaffold with a controllable micro-pore structure by utilization of the selective laser sintering technology. The problems of low toughness and poor intensity of biological ceramics and uncontrollable micro-pore structure of a prepared scaffold in a traditional porous scaffold preparation method are solved. The method is as follows: nano titanium oxide power is added into micron akermanite power, the composite power is mixed uniformly in a mechanical mixing method, and then the mixed power is placed in a selective laser sintering system and a porous akermanite bone scaffold is prepared by utilization of a rapid forming technology. The prepared porous scaffold has tough mechanical properties and an controllable micro-pore structure, and can meet the requirements of tissue-engineered bone research and application.

The invention relates to a method for preparing a negative thermal expansion Mn3 (Cu0.5Ge0.5)N bulk material, which belongs to the technical field of novel functional materials and powder metallurgy. The prior method for preparing a Mn3 (Cu1-xGex)N compound has the problems of long preparation period, high energy-consumption and the like. The method comprises the following steps: preparing single-phase Mn2N0.86 compound powder through solid-gas reaction; evenly mixing the Mn2N0.86 compound powder with Cu and Ge powder according to the stoichiometric ratio of a Mn3 (Cu0.5Ge0.5)N compound; and performing sintering densification on the mixed powder under the protection of argon by using a spark plasma sintering (SPS) method so as to obtain the Mn3 (Cu0.5Ge0.5)N bulk material with negative thermal expansion characteristic. The method has the characteristics of short preparation period and low energy-consumption, and the prepared bulk material has high density.