33results about How to "Shear resistance" patented technology

A dynamic fixation medical implant having at least two bone anchors includes a longitudinal connecting member assembly having rigid sleeves for attachment to the bone anchors, at least one spacer engaging the bone anchors and the sleeves, and in some embodiments, an end elastic bumper. A flexible cord is initially slidingly received within the rigid sleeves, the spacer and the bumper. The spacer may include an optional inelastic inner liner, with at least one of the sleeves having an extension slidingly receivable within the liner. Some sleeves include apertures for receiving a closure top portion for locking the cord against the sleeve, or alternatively receiving a closure top that does not extend into the aperture, the slip or grip option provided by the aperture in each sleeve resulting in an overall connector with variable segmental stiffness.

Methods for increasing the fracture resistance of a polymer stent's drug-polymer coating and scaffolding including applying a coating and crimping using techniques that increase the resistance to fracture in the coating layer and scaffolding and scaffolding.

The invention discloses a concrete column base joint containing a high-ductility replaceable energy-dissipation connecting assembly. The concrete column base joint is arranged on the bottom of a rectangular-section column of a concrete structure, and comprises a concrete column, the high-ductility replaceable energy-dissipation connecting assembly and a concrete base, wherein the high-ductility replaceable energy-dissipation connecting assembly is separately welded with the concrete column and a steel connecting block pre-embedded in the concrete base to form a continuous reliable force transmission system. The bottom of the concrete column is equipped with a column bottom reinforcing core column, so that column bottom pressure can be borne under action of an earthquake, and damages are avoided; and the high-ductility replaceable energy-dissipation connecting assembly is mounted on four side surfaces of the column base joint, so that stressed longitudinal bars on the original positionsare replaced, and therefore, hysteretic behavior can be utilized to dissipate earthquake energy during a medium earthquake or a big earthquake, and damages can be controlled inside.

The invention discloses a heatproof microencapsulated essence used for thermoplastic high polymer materials, and its preparation method. The heatproof microencapsulated essence treats an oil-soluble liquid essence as a capsule core, a gelatin modified amino resin prepolymer as an emulsification dispersant and a gelatin modified amino resin composite material as a wall material. The preparation method of the heatproof microencapsulated essence comprises the processes of prepolymerization, emulsifying dispersion and microcapsule coating. The heat decomposition temperature and the softening temperature of the microencapsulated essence can reach above 200DEG C, mechanical performances comprising the heat resistance, the toughness and the like of the microencapsulated essence are excellent, and the microencapsulated essence has a long-lasting fragrance; and the particle size of the microencapsulated essence is 1-10mum, so the microencapsulated essence can be easily and uniformly dispersed in the high polymer materials.

The invention discloses a fertilizer applicable to sandy saline-alkali land and a preparation method of the fertilizer. The fertilizer applicable to the sandy saline-alkali land comprises the following components: attapulgite clay, coal fly ash, humic acid, plant straw, municipal solid waste sludge, bentonite, polyacrylamide, carboxymethyl cellulose, hydroxyethyl starch and microbial powder in a weight ratio of (20-30):(20-30):(12-16):(18-22):(4-8):(2-4):(2-4):(1-3):(1-2):(0.5-1.5). The fertilizer applicable to the sandy saline-alkali land provided by the invention can effectively improve thesoil structure of the sandy saline-alkali land, reduce the salinity, reduce the content of sand in the soil, improve the content of nutrients in the soil, improve the compactness of the soil, and canenduringly and effectively improve the sandy saline-alkali land through cooperating with plant cultivation.

The invention discloses a method for preparing a middle frame, the middle frame and electronic equipment. The method comprises the following steps: stamping a plane metal panel to form a groove in theedge of the plane metal panel; stretching the plane metal panel with the groove to form a metal outer frame, wherein the metal outer frame is provided with a bottom surface and an annular side framewhich is perpendicular to and surrounds the bottom surface, and the groove is formed in the side wall of the side, facing the bottom surface, of the annular side frame; and carrying out nano injectionmolding treatment on the metal outer frame and defining an accommodating space in the metal outer frame based on the groove to form a plastic structure so as to form the middle frame. Therefore, according to the method, the utilization ratio of raw materials is improved, the production cost is lowered, the processing time is shortened, and the production efficiency is improved.

The present invention relates to a reinforced frame for concrete structure, and belongs to the construction engineering technology. The present invention is characterized in that a steel tube is arranged and small holes are provided on the tube wall of the steel tube. During the process of pouring concrete column, the concrete is combined with the concrete column via small holes on the tube wall to form an integrated body, therefore, the structure has the functions of high pressure resistance, high shearing resistance, and high torque and vibration resistance, and the present invention has the advantages of simple structure, acceleration of construction progress, saving raw materials and labor forces, being not affected by climate and temperature, being fireproof, being aging and corrosion resistant, and extending service life.

The invention discloses a method for planting peanuts and improving a soil fertility condition on sandy saline-alkali soil. The method comprises the steps of application of fertilizer which is suitable for the sandy saline-alkali soil, land parcel finishing, seed treatment, sowing, field management and timely harvesting. The fertilizer which is suitable for the sandy saline-alkali soil comprises attapulgite clay, coal ash, humic acid, plant straw, municipal domestic waste sludge, bentonite, polyacrylamide, carboxymethyl cellulose, hydroxyethyl starch and microbial powder with the weight ratioof (20-30):(20-30):(12-16):(18-22):(4-8):(2-4):(2-4):(1-3):(0.5-1.5):(0.5-1.5). According to the method for planting the peanuts and improving the soil fertility condition on the sandy saline-alkali soil, measures such as application of the fertilizer which is suitable for the sandy saline-alkali soil and peanut planting are adopted for improving the saline-alkali soil, the survival rate and yieldof the peanuts are high, the improvement effect on the whole saline-alkali soil is prominent, and the improvement process is environmentally friendly and free of pollution. Therefore, the method is an application technology which is worthy of large-scale popularization.

The invention discloses a highly seismic region prefabricated assembled bridge central pier stud-cover beam node pouring connection mode and construction and belongs to the field of bridge engineering. The construction comprises a prefabricated pier stud and a prefabricated cover beam. The prefabricated pier stud and the prefabricated cover beam are connected into a bridge pier system through pouring of high-performance materials and splicing. The prefabricated pier stud is composed of a pier stud longitudinal bar, a pier stud stirrup, an overlap-joint large-diameter longitudinal bar, an overlap-joint stirrup and an inclined rebar jointly. The prefabricated cover beam comprises a grouting pipeline, a cover beam construction stirrup and a pouring inserting groove. The splicing quantity of the pier stud longitudinal bar is only a half or much less of the total quantity of longitudinal stressed rebars, and high-performance materials are adopted for pouring splicing. Small damage to a post-earthquake pier stud plastic hinge region is ensured while a large-diameter overlap joint longitudinal bar meets the bridge anti-seismic requirement in a highly seismic region. The bridge building speed can be increased greatly and construction convenience is improved greatly while the bridge anti-seismic requirement in the highly seismic region is met and construction quality is ensured, and a completely novel technical solution can be provided for prefabricated assembled bridge engineering application in the highly seismic region.

The invention relates to a prefabricated concrete member, belonging to the technical field of prefabricated reinforced concrete structures. The prefabricated concrete member is characterized in that bidirectionally crossed distributing bars are distributed in the prefabricated concrete member, wherein included angles between the distributing bars and the sides of the prefabricated concrete member are acute angles or obtuse angles.

The utility model discloses a novel anti-drawing composite beam joint structure. A stud shear key is arranged on the upper surface of an upper flange of the steel beam, the concrete slab is arranged on the steel beam, the steel beam is a support of the concrete slab, a plurality of embedded part plates are arranged on a connecting edge of the concrete slab, each embedded part is divided into an embedded part, an exposed part and an outwards-extending connecting anti-drawing head, and the embedded parts are located in the concrete slab. The embedded part of the embedded part plate is provided with a stressed steel bar hole, and the position of the stressed steel bar hole corresponds to the position of a stressed bar in the concrete plate; connecting steel bar holes are formed in the exposedparts of the embedded part plates, and the sizes of the connecting steel bar holes need to correspond to those of connecting steel bars; a U-shaped hole is formed between the concrete slab and the steel beam, and the U-shaped hole is filled with polymer mortar. The overall stress performance of the composite beam bridge, the tightness between the top flange of the steel beam and concrete, the vertical shear resistance and durability between new concrete and old concrete, the anti-drawing performance and shear resistance between steel and concrete and the bearing capacity of a joint at the manufacturing position are improved.

The invention discloses a tear-resistant rubber material which is prepared from the following raw materials in parts by weight: 30-50 parts of chloroprene rubber, 15-22 parts of styrene-butadiene rubber, 3-8 parts of an antioxidant, 6-11 parts of highly dispersible silica, 6-8 parts of modified fly ash, 6-11 parts of an antioxidant RD, 5-7 parts of N220 reinforcing carbon black, 7-14 parts of octylphenolic resin, 2-6 parts of a silane coupling agent, 0.2-2 parts of dicumyl peroxide, 6-8 parts of nano-alumina, 3-5 parts of 2-mercaptoimidazoline, 2-4 parts of a scorch retarder, 5-9 parts of antimonous oxide, 4-7 parts of activated zinc oxide, 4-8 parts of carbon black N100. The tear-resistant rubber material has the benefits of being good in toughness and capable of resisting torsion and shear force and preventing the rubber from tearing.

The invention discloses a long-acting dust sealing agent and a preparation method thereof, and belongs to the technical field of dust sealing agents. The problems that an existing dust sealing agent is short in dust suppression period, prone to destroying soil and the like are solved. The dust sealing agent is composed of 30-50 parts of plant cellulose, 10-30 parts of polycaprolactone, 13-18 partsof sodium lignin sulfonate, alginate, polyfumaric acid, starch grafted acrylate, sodium carbonate, starch modified polyacrylamide, carboxymethyl starch and deionized water. The preparation method comprises the steps: adding sodium lignin sulfonate into deionized water to adjust the pH value of the solution to 8-9; adding plant cellulose and polycaprolactone into the solution, sequentially addingpolyfumaric acid, starch grafted acrylate, sodium carbonate and starch modified polyacrylamide, uniformly mixing, adjusting the pH value to be neutral, and then adding carboxymethyl starch; and filtering the obtained solution by a microfiltration membrane, and carrying out spray drying. The long-acting dust sealing agent can be used for roads, mining areas and other places with serious dust raising.

The invention provides a concrete member. The concrete member comprises a main body, a first fixing plate, a second fixing plate, a third fixing plate, a fourth fixing plate and a fifth fixing plate, the first fixing plate is connected with the lower surface of the main body; the main body comprises a shell and steel bars, and the included angle between the steel bars and the shell is an acute angle. The first fixing plate, the second fixing plate, the third fixing plate, the fourth fixing plate and the fifth fixing plate are connected with the main body, the structural strength of the concrete member is greatly improved, and the steel bars distributed in a two-way cross mode are fixedly connected with the fourth fixing plate and the fifth fixing plate correspondingly; the included angles between the two ends of the steel bars and the fourth fixing plate and between the two ends of the steel bars and the fifth fixing plate are acute angles, and shearing force borne by the concrete member can be effectively resisted. And the two ends of the steel bars are connected with the fourth fixing plate and the fifth fixing plate, so that slippage between concrete can be reduced, the connecting performance of the concrete member is enhanced, and the reliability of the concrete member is improved.

The invention relates to the technical field of wind power blades, in particular to an anti-shearing connecting structure and a segmented wind power blade. The anti-shearing connecting structure comprises a first segment, a second segment and a connecting part, wherein the first segment and the second segment are arranged in the length direction of the wind power blade; a first connecting structure is arranged between the first segment and the second segment, and the first connecting structure is parallel to the length direction of the wind power blade and is used for fixing the first segment and the second segment; the connecting part comprises at least one matching surface, the connecting part is matched with the first segment and the second segment on the matching surface, and the matching surface is parallel to the length direction of the wind power blade; and a second connecting structure is arranged on the connecting part, the second connecting structure penetrates through the matching surface in the direction perpendicular to the length direction of the wind power blade, and the first segment and the second segment are fixed with the connecting part separately. According to the anti-shearing connecting structure, the length direction between the segments of the wind power blade and the direction perpendicular to the length direction are fixedly connected, so that the shearing force generated when the wind power blade rotates can be well resisted, and the connecting strength is guaranteed.

The invention discloses a construction, identification and expression method of a porcine ACE2 eukaryotic expression recombinant plasmid vector. The method comprises the following steps: constructingan ACE2 eukaryotic expression vector, transfecting CHO cells, and screening stably-expressed pcDNA 3.1 (+)-ACE2 cell strains through G418 to obtain ACE2 protein with biological activity. The method has the advantages that (1) the reaction is quick, and only one hour is needed; (2) simplicity: the method is not influenced by fragment enzyme digestion sites, and enzyme digestion is not needed; (3) high efficiency: the positive rate reaches 95% or above; and (4) seamlessness: extra sequences are not introduced. ACE2 exerts various body protection functions such as vasodilation, inflammation inhibition and fibrosis resistance by targeted degradation of AngII. Besides, as a functional receptor of severe acute respiratory syndrome coronavirus (SARS-CoV), the porcine ACE2 eukaryotic expression recombinant plasmid vector has extraordinary clinical significance. The invention lays a foundation for deeply researching the biological function and the molecular mechanism of the porcine ACE2 servingas a potential virus receptor in porcine coronavirus infection and developing the ACE2 serving as a coronavirus targeted therapy drug.

The invention discloses a dry gas holder piston steel concrete composite box girder. The dry gas holder piston steel concrete composite box girder comprises an open box girder shell, box girder concrete, a box girder stirrup, a box girder longitudinal reinforcement, a fluke, a lightweight material, a lightweight material bearing rod, a lightweight material block, and a piston box girder stiffening rib. The fluke is welded in the inside of the open box girder housing, the box girder stirrup and the box girder longitudinal reinforcement are located on the outside of the box girder, the lightweight material is arranged in the middle of the piston box girder, the bearing rod is arranged on the outside of the lightweight material, A certain amount of lightweight material blocks are arranged between the bearing rod and the lightweight material; the piston box girder stiffening rib is located on the inside of the piston box girder, and welded on the inside of the open box girder shell; and the box girder concrete is filled in the inner part of the open box girder shell. The dry gas holder piston steel concrete composite box girder solves the problems that the mechanical behavior of the structure and the piston box girder stiffening rib protruding and unable to form walkway caused by low pressure and the piston box girder concrete pouring insufficient are decreased, the investment is low, the construction time is short and the economic benefit is considerable.