34results about How to "Does not affect structural stability" patented technology

The invention discloses a degradable composite water-preserving agent for greenhouse planting. The degradable composite water-preserving agent is prepared from the following raw materials in parts by weight: 50 to 55 parts of crop straws, 40 to 55 parts of urea, 18 to 20 parts of ammonium dihydrogen phosphate, 22 to 25 parts of potassium persulfate, 10 to 15 parts of potassium sulfate, 16 to 18 parts of potassium chloride, 24 to 36 parts of acrylic acid, 50 to 80 parts of carboxymethyl cellulose, 6 to 10 parts of N,N-methylene bisacrylamide, 9 to 12 parts of polyvinyl alcohol, 30 to 50 parts of humic acid and 70 to 100 parts of acrylamide. The water-preserving agent disclosed by the invention has an excellent water regulating and controlling function; the degradable composite water-preserving agent can continuously supply water for a greenhouse to plant and grow; after the water-preserving agent absorbs water, the water-preserving agent becomes irregular gel particles; after the water-preserving agent is blended with dry material, the air permeability, the water permeability and the structural stability of a culture material are not affected; the problem that water replenishment is difficult at the later stage of greenhouse planting is solved; the water-preserving capability of the culture material is improved, and the yield of greenhouse planting is increased; meanwhile, the water-preserving agent disclosed by the invention has degradability, no pollution to the environment and better popularization value.

The invention relates to a high-temperature alloy for a hydrogen fuel cell air compressor bearing, and a preparation method thereof. The high-temperature alloy adopts austenite with a disordered face-centered structure reinforced by adopting an ordered phase L12-gamma' and a body-centered tetragonal ordered structure gamma''-(Ni3Nb); the volume fraction of a reinforcement phase ranges from 10 percent to 25 percent; and the high-temperature alloy is prepared from the components in proportion by weight: 0.02 to 0.08 percent of C, 9 to 18 percent of Fe, 12 to 18 percent of Cr, 0.85 to 1.5 percentof Al, 1.2 to 2.25 percent of Ti, 3.5 to 5 percent of Nb, 2 to 5 percent of Mo, less than or equal to 0.05 percent of B, less than 0.25 percent of Si, less than 0.25 percent of Mn, and the balance Ni, so that the alloy has excellent high-temperature strength and structure stability, and favorable machinable property and economical efficiency. According to the alloy, a TCP phase is not precipitated obviously at the temperature below 760 DEG C, the tensile strength at the temperature being 760 DEG C is larger than 1000MPa, and the alloy is particularly suitable for preparing a medium-high temperature force-bearing part including a hydrogen cell of the hydrogen fuel cell air compressor bearing.

The invention discloses a lithium-rich manganese-based/graphene composite cathode material, a preparation method thereof and an application thereof. The method comprises the steps of: preparing precursor powders by a coprecipitation method and by using a manganese source, a nickel source, a cobalt source, a complexing agent and a precipitating agent as raw materials; subjecting the obtained precursor powders and a lithium source to two-stage calcination to obtain a lithium-rich manganese-based cathode material; then subjecting the obtained lithium-rich manganese-based cathode material and a graphene dispersion to high-energy ball milling; and obtaining the lithium-rich manganese-based/graphene composite cathode material by drying. In the product prepared by the method, the graphene sheet can be well compounded between the surface of the lithium-rich manganese-based material particle surfaces and the particles, and form a more perfect conductive network around the particles. The cathodematerial improves the charging and discharging process and the electrical conductivity of the lithium ion battery under the premise of maintaining the structural stability, and has a simple process and good repeatability.

The invention discloses a N-heterocycle molecule modified UiO-66-NH2 material with a stable structure and a preparation method of the N-heterocycle molecule modified UiO-66-NH2 material, and the N-heterocycle molecule modified UiO-66-NH2 material is prepared by carrying out Schiff base reaction on m-phthalaldehyde, 3, 5-diamino-1, 2, 4-triazole and a-NH2 group on the surface of UiO-66-NH2. According to the invention, UiO-66-NH2 is synergistically modified through isophthalaldehyde and 3, 5-diamino-1, 2, 4-triazole, 3, 5-diamino-1, 2, 4-triazole molecules are introduced through a post-synthesis modification mode by taking isophthalaldehyde as a bridge based on an active-NH2 group on a skeleton, so that the number of nitrogen atoms on the surface of a modified material can be remarkably increased, the multi-functionalization of materials can be realized, the obtained modified material shows excellent stability after being soaked in an aqueous solution with the pH value of 2-12 for one week, soaked in reflux water for one day and soaked in deionized water for one month.

The invention relates to a battery structure capable of injecting liquid from bottom. A battery cell of the battery structure is horizontally arranged on the bottom surface of a battery shell or a bottom surface support of the battery shell, and a middle space region of the battery cell is aligned to the central position of the bottom surface of the battery shell; and a liquid injection hole position of the battery is formed in the center position of the bottom surface of a battery shell, and electrolyte is injected into an inner cavity of the battery shell from bottom to top through the liquid injection hole position, so that the electrolyte is directly dispersed and guided to each region of the surface of the battery cell from the liquid injection hole position through a middle space region of the battery cell. According to the battery structure provided by the invention, the liquid injection hole is formed in the bottom part of the battery for liquid injection, and the space at the central position of the internal battery cell is ingeniously utilized and matched with the corresponding flow guide structure, so that the smoothness of liquid injection operation of the battery can be improved on the premise of not influencing the stability of the structure of the battery, and the full infiltration of the battery cell can be ensured.

The invention discloses a low-noise high-speed train pantograph based on a bionic structure. The train pantograph comprises pantograph corners, a pantograph head bracket, contact carbon sliding plates, a bracket rod, an upper arm rod, a lower arm rod, a bottom frame and an insulator, the insulator is arranged at the bottom of the bottom frame, one end of the lower arm rod is arranged on the bottomframe, and one end of the upper arm is hinged to the other end of the lower arm rod. The pantograph head support is hinged to the other end of the upper arm, the carbon sliding plates are arranged atthe two ends of the pantograph head support, the pantograph corners are fixed to the two ends of the carbon sliding plates, and the support rod is arranged on the pantograph head support and arrangedbetween the carbon sliding plates. The shape of the pantograph head rod piece of the pantograph is improved based on the bionic structure, aerodynamic noise of the pantograph head is effectively controlled, it is guaranteed that structural stability and electric power functional characteristics of the pantograph are not affected, and interference of the aerodynamic noise of the pantograph of thehigh-speed train on the surrounding environment is reduced.

The present invention discloses a cryptochlorogenic acid preparation method comprising the following steps: taking chlorogenic acid, dissolving the chlorogenic acid in methanol, then adding 1-2mol / L hydrochloric acid for the reaction while stirring for 6-8h, using a 1-2mol / L NaOH solution for adjusting pH to be neutral, concentrating, dissolved in methanol, filtering, concentrating under reduced pressure, adding water for dissolving, and filtering to obtain a filtrate; taking the filtrate for pretreatment by a reverse phase C18 column, washing with water, collecting a water washing solution, concentrating, centrifuging, filtering, and preparing cryptochlorogenic acid by reverse phase industrial preparative chromatography. According to the cryptochlorogenic acid preparation method, best acid conversion conditions and alkali neutralization reaction conditions can be obtained by screening by system experiments, the high purity cryptochlorogenic acid can be prepared by the reverse phase industrial preparative chromatography, and the method is high in yield and suitable for large-scale preparation, and achieves good technical results.

The invention discloses an insert-type hanging structure and an installation method. The hanging structure comprises an inserting piece and a hanging piece, wherein the upper side of the hanging pieceis hung on a side edge structure of a sectional material, a second containing cavity used for being fixedly connected with a veneer is formed in the lower side of the hanging piece, an inserting cavity is formed in the middle structure of the hanging piece, a second splicing plate is arranged at the position, located at an end opening of the inserting cavity, of the front end of the second containing cavity, an inserting end used for being inserted into the inserting cavity is arranged at the front end of the inserting piece, a first containing cavity used for being fixedly connected with theveneer is formed in the lower side of the inserting piece, a first splicing plate is arranged at the front end of the first containing cavity, and when the inserting end is inserted into the inserting cavity, the first splicing plate and the second splicing plate abut against each other and stop the inserting end from continuing to be inserted into the inserting cavity, so that the veneer locatedin the first containing cavity and the veneer located in the second containing cavity can be assembled in a butt joint mode. According to the hanging structure, modularized assembly can be achieved,the stability of a wallboard is enhanced, a leveling structure and a hanging structure are combined and integrally assembled, and the installation efficiency is improved.

The invention relates to the technical field of building deviation rectification engineering, in particular to a building grading jacking deviation rectification method which comprises the steps that (1) a building needing deviation rectification is analyzed, and the position of a building jacking point is determined; (2) determining the optimal jacking force and the maximum jacking height of each jacking point according to the overall load and the gravity center of the building and the setting positions of the jacking points; (3) according to the maximum jacking height of each jacking point and counter force provided by soil body springback, the grading jacking grade number of each jacking point and the jacking height of each grade are calculated; 4) excavating a construction operation pit and an operation surface, and then arranging a jacking system at each jacking point; 5, after the jacking system is arranged, the building foundation is jacked according to the jacking grade number and the jacking height of each grade. According to the method, the foundation on the settlement side of the building is jacked in a grading jacking and grouting mode, the internal space and the overall structure of the building are not damaged, and the structural integrity and safety of the building are guaranteed.

The invention discloses a joint construction method of an inclined surface of a ring road in a test yard. The method comprises the following steps: A, according to the design requirements of the inclined surface of the ring road, laying an inclined surface base layer in advance, and then laying a graded crushed stone mixture on the inclined surface base layer; B, laying the graded crushed stone mixture on the inclined surface base layer; B, star to spread that asphalt layer section by section along the length direction of the inclined surface of the extension ring road, laying a stainless steel pipe in front of the truncation of the asphalt lay, and laying the stainless steel pipe along the slope surface of the inclined surface of the extension ring road from the top to the bottom; C, starfrom that truncated surface of the asphalt lay, adopting a paver to continuously lay a new asphalt layer on the stainless steel pipe; D, arrange a roller to roll that new asphalt lay along the lengthdirection of the inclined surface of the ring road, continuously supplying wat from the upper end to the lower end of the stainless steel pipe by adopting a water injection pipe, and cooling the joints of the new asphalt layer and the paved asphalt layer; E, aft meeting that joint temperature of the new asphalt lay and the paved asphalt layer, the water injection pipe stops the wat supply and thestainless steel pipe is plugged with cement slurry.