44results about How to "Small branch" patented technology

The invention relates to a novel polyethylene powder coating, and especially relates to the preparation of the polyethylene powder coating compositely modified by carbon nanofibers and epoxy resin. The polyethylene powder coating of the invention comprises 100 parts of linear low density polyethylene (PE), 5-10 parts of carbon nanofibers, 10-15 parts of epoxy resin, 5-20 parts of micron-grade inorganic fillers, 1-3 parts of silane coupling agents, and 1-5 parts of powder additives. The preparation employs a parallel-exhausting twin-screw extruder, a high-speed mixer, and a high-speed pulverizer. The obtained product has high mechanical strength, good impact resistance, and excellent adhesion to metal substrates.

The invention discloses a preparation method of a spinnable polycarbosilane precursor material. The preparation method includes the steps: placing polydimethyl silane into a pyrolysis kettle, openinga vacuum valve of the pyrolysis kettle, turning on a vacuum pump, closing the vacuum valve of the pyrolysis kettle when the pyrolysis kettle is vacuumized to be -0.08 to -0.09Mpa, opening a nitrogen valve of the pyrolysis kettle, leading in nitrogen, enabling the internal pressure of the pyrolysis kettle to be 0.04Mpa and maintaining the pressure for 20-24 hours; vacuumizing the pyrolysis kettle to be lower than -0.09Mpa, turning on a stirring device and a heating device of the pyrolysis kettle, heating the inside of the pyrolysis kettle to reach the temperature of 200 DEG C, keeping the temperature for 1-3 hours, continuously stirring the polydimethyl silane in the pyrolysis kettle at high temperature and low pressure to remove residual solvents of the polydimethyl silane, increasing thetemperature for pyrolysis, transferring the polydimethyl silane to a synthesis kettle and performing synthesis at the high temperature and high pressure to obtain polycarbosilane. A molecular chain inthe prepared polycarbosilane is good in linearity, branches on the molecular chain are fewer and less crossed, the polycarbosilane is moderate in viscosity and good in spinnability, the molecular weight of the prepared polycarbosilane is moderately 800-1300, and the polycarbosilane is the most spinnable.

The invention discloses a tissue culture and rapid propagation method of E. urophylla*E. Grandis DH32-43. The method is implemented through the steps of explant establishment, explant disinfection, primary culture, subculture, rooting culture, seedling-hardening, transplantation and the like. According to the invention, special culture medium components are selected for the primary culture, subculture and rooting culture, the E. urophylla*E. Grandis is fast in growth and high in survival rate after being transplanted by virtue of a reasonable seedling-hardening measure, and the purposes of high propagation coefficient and excellent propagation effect are achieved; besides, the method is low in production cost, and the genetic characteristics of obtained tissue culture seedlings are consistent, therefore, the method is an effective way for tissue culture and rapid propagation of eucalyptuses, and has wide application range.

The invention discloses a tissue culture and rapid propagation method for eucalyptus urophydis DH32-26 varieties. The tissue culture and rapid propagation method is realized through the steps of explant establishing, explant disinfection, primary culture, subculture, rooting culture, domestication, transplanting and the like; a special culture medium is selected for primary culture, subculture and rooting culture, and reasonable domestication measures are adopted, so that the transplanted eucalyptus urophydis is rapid in growth and high in survival rate, and the aims of high propagation coefficient and good propagation effect are achieved. Meanwhile, the method disclosed by the invention is low in production cost, is an effective path for tissue culture and rapid propagation of a eucalyptus, and is wide in application range; and the genetic characters of the obtained tissue culture seedlings are consistent.

The invention discloses a cultivation method for bringing tea trees into production in advance. The cultivation method includes steps of (1), clearing lands, applying fertilizers, carrying out watering and covering the lands with black mulching films; (2), dipping the roots of tea seedlings in root liquid for 10-15 s before the tea seedlings are transplanted; (3), transplanting the tea seedlings, to be more specific, digging holes in the mulching films and planting the tea seedlings in double-row and double-plant modes; (4), carrying out watering and soil covering, to be more specific, sufficiently watering the tea seedlings with root colonizing water, then carrying out soil covering and sealing on broken openings of the mulching films but necessarily exposing soil in the ranges of 10-12 cm around the root stock of the tea seedlings; (5), applying fertilizers, to be more specific, perforating the mulching films to apply the fertilizers, or furrowing the centers of small tea rows to apply the fertilizers and applying the compound fertilizers with the pH (potential of hydrogen) values of 6-7; (6), secondarily pruning the tea seedlings and carrying out secondary topping on the tea seedlings. The root liquid comprises 800-1000 times dilution of rooting agents, 1200-1500 times dilution of bactericides and 0.4-0.6 kg / L of clay. The cultivation method has the advantages that the survival rate of the tea seedlings can be increased, and the tea trees can be brought into production in advance by a year; more than a half of weeding cost can be reduced, the quality of the tea trees can be enhanced, the yield of the tea trees can be increased, and economic value of the tea trees can be increased.

The invention discloses a dormancy breaking method for nitraria tangutorum. The method comprises following steps: collecting fruits of the nitraria tangutorum; taking seeds from the collected fruits;selecting the seeds; treating the seeds; cleaning the treated seeds; performing low-temperature deposition treatment on the cleaned seeds. The method is simple and convenient to operate, and has gooddormancy breaking effect, high one-time germination rate, high field emergence speed and wide applicable range.

The invention relates to the technical field of connecting joints, in particular to a reinforced concrete belt steel ring plate connecting joint used for a precast beam column and a connecting method.The connecting joint comprises a precast column and a plurality of precast beams which are arranged around the precast column, wherein the center line on which the circle center of a circle enclosedby the precast beams is located is coaxial with the center axis of the precast column; a reinforcing steel bar, positioned at the outer layer, in the precast column extends in a direction away from the precast column, and a reinforcing steel plate is arranged on the extended reinforcing steel bar; connecting reinforcing steel bars which are arranged towards the reinforcing steel plate are arrangedon the precast beam; the connecting reinforcing steel bars are fixedly connected to the reinforcing steel plate; and concrete layers are poured between the precast column and the precast beams. In aprocess of the connecting method, the novel connecting joint structure is adopted. A series of problems generated by connecting reinforcing steel stacking and placing in the prior art are solved, connection of the reinforced ring beam joint is realized through a brand-new connecting joint structure and a brand-new connecting method, and a construction process is simplified; and moreover, the connected ring beam joint is higher in compactness, is higher in stress strength and is better in anti-seismic property.

The invention discloses a tissue culture and rapid propagation method of Eucalyptus urophylla DH32-26 variety, which is realized through the steps of explant establishment, explant disinfection, primary culture, subculture, rooting culture, seedling hardening and transplanting. , A special medium composition was selected for primary culture, subculture and rooting culture. Reasonable seedling hardening measures made Eucalyptus macrophylla grow fast after transplanting, with a high survival rate, and achieved the purpose of high reproduction coefficient and good reproduction effect. Simultaneously, the production cost of the method of the invention is low, and the obtained tissue culture seedlings have consistent genetic traits, which is an effective way for tissue culture and rapid propagation of eucalyptus, and has a wide application range.

The invention discloses a tissue culture rapid propagation method of Eucalyptus urophylla DH33-27 variety, which is realized through the steps of explant establishment, explant disinfection, primary culture, subculture, rooting culture, seedling hardening and transplanting. , A special medium composition was selected for primary culture, subculture and rooting culture. Reasonable seedling hardening measures made Eucalyptus macrophylla grow fast after transplanting, with a high survival rate, and achieved the purpose of high reproduction coefficient and good reproduction effect. Simultaneously, the production cost of the method of the invention is low, and the obtained tissue culture seedlings have consistent genetic traits, which is an effective way for tissue culture and rapid propagation of eucalyptus, and has a wide application range.

The invention discloses a seed selection method of E. urophylla*E. Grandis clone DH30-1. The method comprises the following steps: firstly, a female parent Eucalyptus urophylla U16 and a male parent Eucalyptus grandis G22 are taken as parents, and subjected to castration, bagging, pollen collection, artificial pollination, bag removing, seed collecting, seeding and seed selection to obtain the E. urophylla*E. Grandis clone DH30-1 with consistent characters, stable inheritance and not subjected to character segregation. The E. urophylla*E. Grandis clone DH30-1 has the characteristics of fast growth, high yield, short rotation (industrial fiber material is adopted), straight stem form, small branches, neat forest phase, good material property, straight texture, good barrenness resistance, and capability of being suitable for being planted in large-area regions.

The invention discloses a tissue culture and rapid propagation method of Eucalyptus urophylla DH32-28 variety, which is realized through the steps of explant establishment, explant disinfection, primary culture, subculture, rooting culture, seedling hardening and transplanting. , A special medium composition was selected for primary culture, subculture and rooting culture. Reasonable seedling hardening measures made Eucalyptus macrophylla grow fast after transplanting, with a high survival rate, and achieved the purpose of high reproduction coefficient and good reproduction effect. Simultaneously, the production cost of the method of the invention is low, and the obtained tissue culture seedlings have consistent genetic traits, which is an effective way for tissue culture and rapid propagation of eucalyptus, and has a wide application range.

The invention discloses a crossbreeding method for low-stem maize. The maize with plant height which is 1.5m or lower, small tassel, few branches, long spike and long grain is selected as a female provenance, and a maize with plant height 2m or lower, large tassel, sufficient pollen, long spike and long grain is selected as a male provenance, and therefore, a maize plant obtained by hybridizationis short, is suitable for high-density plantation and has the characteristics of high maize yield, stable yield, high disease resistance, resistance to lodging and high stress resistance.

The invention provides a plantation method for increasing yield of kiwi fruits and relates to the technical field of fruit tree cultivation. The plantation method comprises a plot processing stage, a sowing stage and a field management stage. According to the invention, organic fertilizers and chemical fertilizers are combined and used as fertilizers; high yield and high quality of plants can be achieved; soil can be protected; the method is characterized by natural, healthy, green and safe effects, avoidance of toxic and side effects, etc.; through rational cooperation of fertilizers, fertilization modes and other plantation methods, planted kiwi fruits have a high survival rate and high growth quality; and in addition, fruit yield of kiwi fruits is increased through rational fertilization.