20results about How to "Moderate density" patented technology

A long-fiber non-woven fabric comprising fibers mainly composed of a thermoplastic resin, the fibers having an average single-fiber diameter of 10.0 [mu] m or more and 20.0 [mu] m or less, and the cross-sectional porosity of the long-fiber non-woven fabric being 30% or more and 80% or less. Provided is a long-fiber non-woven fabric having excellent flexibility in which it is possible to follow the device form of an airbag housing member, and excellent mechanical strength in which it is not broken or split when in contact with the airbag housing member.

The invention relates to the technical field of alloys, in particular to a Ni3Al-based alloy, a test bar, a turbine disc and a preparation method of the Ni3Al-based alloy. The invention discloses a Ni3Al-based alloy which comprises the following components in percentage by mass: 7%-9% of Al, 7%-8.5% of Cr, 0.13%-0.24% of C, 0.5%-2% of Ti, 3%-6% of Mo, 1%-3% of W, 1%-2% of Hf, 0.005%-0.03% of B and the balance of Ni. According to the Ni3Al-based alloy disclosed by the invention, all the elements are coordinated and matched, so that the Ni3Al-based alloy has a long-range ordered crystal structure, a stable high-temperature phase structure and excellent oxidation resistance, mechanical property and high-temperature property.

The invention discloses an efficient flotation grading separation device and method for microplastics, and belongs to the field of pretreatment research of microplastic pollutants. Comprising an iron stand; the flotation separation mechanism is arranged on the iron stand and is used for carrying out overflow operation on flotation liquid containing the micro-plastics; the impurity collecting assembly is arranged on the iron stand and located at the opening in the lower end of the flotation separation mechanism; the flotation liquid collecting assembly is located below the overflow outlet of the flotation separation mechanism and used for collecting the overflow flotation liquid; and the graded filtering mechanism is located on one side of the flotation separation mechanism and used for filtering flotation liquid overflowing out of the flotation separation mechanism in a graded mode. The flotation liquid used in the method is non-toxic and harmless, the density is moderate, large-density micro-plastics can be conveniently extracted, the flotation liquid is convenient to recycle and can be repeatedly used, energy is saved, consumption is reduced, and meanwhile the influence on the surrounding environment is reduced.

The invention discloses a bamboo-wood plywood, which is formed by gluing a bamboo strip curtain layer, a wood veneer layer, a bamboo mat layer, and an impregnated paper layer. The wood veneer layer, the bamboo mat layer, and the impregnated paper layer are symmetrically arranged on both sides of the bamboo strip curtain layer in sequence. The bamboo strip curtain layer is woven from radial bamboo strips without removing bamboo green and bamboo yellow, and the bamboo mat layer is woven from chordal bamboo strips with bamboo green and bamboo yellow removed by warp and weft interweaving. The invention also discloses a preparation method of the bamboo-wood plywood. The invention has the advantages of high production efficiency, few hot pressing defects, suitable density, excellent mechanical properties, and the like.

The present application relates to the field of aquaculture, and particularly relates to a device and method for vertical seedling and bottom sowing and propagation of sessile shellfishes, comprising a culture frame and a culture tray, wherein the culture tray comprises a side plate, a shelf, a seedling attachment device and a connector, the side plate forms a rectangular frame, the top and bottom of the rectangular frame are open, a plurality of water-permeable holes are arranged on the side plate, the shelf is arranged in parallel on the outer side of the side plate, the seedling attachment device is arranged to block the opening at the bottom of the rectangular frame, the seedling attachment device is connected to the opening at the bottom through the connector, the culture frame comprises a three-dimensional frame and a shelf frame, the shelf frame is arranged in parallel inside the three-dimensional frame, and the shelf is arranged on the shelf frame. By using the device, the density of the seedlings during attachment can be adjusted, the density of the seedlings is made to be reasonable, and the suitable density for the growth of the seedlings is obtained.

This invention discloses a synchronous drilling device for caissons, used for drilling cement mixing piles during caisson construction. It includes a fixed base, a lifting device, a turntable, slide rails, a movable device, a drilling machine, a connecting rod, and a circumferential adjustment disc. A support frame is provided at the bottom of the fixed base, and a synchronous tightening device is provided inside the support frame. The fixed base is installed at the upper part of the caisson position via the synchronous tightening device and the caisson hole support wall. The lifting device is located on the upper surface of the fixed base, and a disc is provided at the top of the lifting device that can cooperate with the turntable and achieve coaxial rotation. Multiple evenly distributed slide rails are provided radially outward along the edge of the turntable to assemble the movable device. Each movable device is equipped with a drilling machine and can move along the slide rails with the entire assembly. A circumferential adjustment disc is located at the center of the upper part of the turntable and is connected to the movable device via a connecting rod. Driving the circumferential adjustment disc can drag the connecting rod, thereby moving the movable device along the slide rails. This device can simultaneously process multiple cement mixing pile holes, adjust positions, perform high-efficiency repeated drilling, and is easy to move as a whole.

The embodiment of the present invention discloses a method, device, computer equipment and storage medium for constructing map annotations. The method includes: entering vector surface elements into a spatial database in a global geographic coordinate system to obtain a vector surface data set; entering business data related to the vector surface elements into a database in a specified two-dimensional relationship table structure to obtain a business data set, and specifying a foreign key of the vector surface data set; performing query optimization; calculating an annotation point data set, and clustering the annotation point data set according to a set clustering distance threshold; setting a retention threshold according to a view range, returning the annotation points with the largest cumulative area after the first n clusters, to obtain an annotation point data set to be visualized; constructing an annotation text data set; and constructing an annotation vector tile. By implementing the method of the embodiment of the present invention, the automatic construction of map annotations can be realized, taking into account complex vector elements under different scale views, and keeping the annotation density at a reasonable level.

The invention discloses a ceftazidime continuous preparation method, comprising the following steps: S1, preparing a ceftazidime dihydrochloride solution; S2, preparing a sodium hydroxide solution; S3, preparing a phosphoric acid solution; S4, respectively adding the ceftazidime dihydrochloride solution and the sodium hydroxide solution into a high-speed centrifugal mixer at a certain flow rate for rapid mixing, and then flowing out from the outlet of the high-speed centrifugal mixer to obtain a ceftazidime solution 1; S5, adding a suspension of ceftazidime crystal seeds and water into a crystallizer A, and simultaneously continuously and uniformly adding the ceftazidime solution 1 and the phosphoric acid solution; S6, when the volume of the crystallization liquid in the crystallizer A exceeds 100 ml, the crystallization liquid automatically overflows from the crystallizer A and flows into the crystallizer B, and the crystals are grown in the crystallizer B for a period of time, filtered, washed and dried to obtain a ceftazidime product. The invention can significantly reduce the content of impurities, especially the impurity content of RRT=0.82, improve the purity, and the powder particle size is uniform.

The invention relates to the technical field of brine drilling fluids, in particular to a high-performance brine drilling fluid for potassium salt drilling, which is prepared from the following raw materials in percentage by weight: 2-3% of sepiolite, 1-2% of rice hull powder, 2-5% of macromolecular hydrophilic colloid, 1.5-3% of water-soluble alcohol, 0.2-1% of inorganic salt recrystallization inhibitor and the balance of composite brine, the composite brine is composed of water, sodium chloride, magnesium chloride, potassium chloride, lithium chloride, calcium bicarbonate and boric oxide, and the composite brine drilling fluid further comprises at least one of a salt-resistant filtrate reducer, a salt-resistant anti-collapse agent, a salt-resistant plugging agent and a salt recrystallization inhibitor. The sepiolite, the rice hull powder, the macromolecular hydrophilic colloid, the water-soluble alcohol 1, the inorganic salt recrystallization inhibitor and the composite salt water adopted by the drilling fluid are low in raw material cost, low in price, easy to obtain and high in environmental protection property, the drilling fluid prepared from the raw material components is moderate in density and proper in viscosity, the drilling tool jamming phenomenon can be effectively improved in the process of preparing ores of a potassium salt ore bed, and the drilling efficiency is improved. And the drilling and coring quality is high.

The invention relates to the technical field of preparation of n-butane, and discloses a method for preparing n-butane from iso-butane, and the method comprises the following steps: contacting an iso-butane raw material with a catalyst under a hydrogen condition and a normalizing reaction condition, wherein the catalyst comprises an active substrate and an active metal component loaded on the active substrate; wherein the active matrix comprises an acidic active component SO4 < 2-> / ZrO2, an all-silicon molecular sieve with an MFI structure and aluminum oxide; the active metal component is selected from at least one of noble metal elements; wherein in the catalyst, the density of the strong acid center is 0.1-1 [mu] mol / m < 2 >. The method is mild in condition and environment-friendly, has higher isobutane conversion per pass and n-butane selectivity, can increase the yield of n-butane by using isobutane, provides high-quality raw materials for an ethylene cracking device and a device for preparing maleic anhydride by using a butane oxidation method, and realizes value-added utilization of butane resources.

The invention provides a diimine ligand with a general formula structure as shown in a formula L. In the formula, R1-R8 are respectively and independently selected from H, C1-C6 alkyl, C1-C6 alkoxy, C6-C12 aryl or halogen. The diimine ligand is prepared from a 1, 2-diketone compound with an isatin skeleton and large-steric-hindrance aromatic amine with an aniline skeleton through acid catalysis. The invention also provides a late transition metal polyethylene wax catalyst adopting coordination of the diimine ligand and a late transition metal salt, the catalyst has high catalytic activity in a wide temperature range and excellent high-temperature stability, the late transition metal polyethylene wax catalyst is applied to preparation of polyethylene wax, and the preparation cost of the polyethylene wax is greatly reduced. The product has the characteristics of narrow molecular weight distribution, low branching degree, good chemical and physical properties and the like. # imgabs0 #

The invention discloses an active magnesium oxide and a preparation method thereof, and relates to the technical field of magnesium oxide preparation. The method comprises the following steps: calcining and dissociating the first magnesium ore, strengthening leaching and carbonization separation to obtain calcium carbonate and active low-calcium magnesium-rich liquid; calcining and dissociating the second magnesium ore and mechanically grinding to obtain fine material, or directly mechanically grinding the second magnesium ore to obtain fine material; pumping the active low-calcium magnesium-rich liquid into a hydration activation tank, stirring and then conveying the fine material to the hydration activation tank, the active low-calcium magnesium-rich liquid and the fine material undergo hydration reaction and form a composite magnesium salt; drying and breaking up the composite magnesium salt and conveying it to a calcining furnace, calcining, cooling and spiral discharging to obtain active magnesium oxide. The magnesium oxide prepared by the method has moderate density, rich active sites, good dispersibility, excellent adsorption, hydration and ionization properties, and has significant effects and cost advantages as an alkaline precipitant, which is conducive to the market promotion and application of high-activity magnesium oxide products in the fields of environmental protection and metallurgy.

The invention belongs to the technical field of neutron shielding materials, and particularly relates to a metal ceramic shielding material for shielding neutrons and gamma rays. The metal ceramic shielding material is a (WxMo1-x) AlB-MAB solid solution phase compound and has a monoclinic cubic crystal structure, and a unit cell of the metal ceramic shielding material is formed by alternately stacking MB units and A atom planes; the compound is composed of elements W, Mo, Al or 6061Al alloy and B, Mo is a solid solution atom of W at the M position, the atomic concentration x of Mo is 5-40 at%, and alloy elements Si and Mg atoms in the 6061Al alloy are mainly at the A position. The compound phase metal ceramic shielding material has extremely high W and B contents, and has excellent shielding characteristics for neutrons and g rays of various energy segments; moreover, the material has dual characteristics of metal and ceramic, namely, the material has good mechanical properties, excellent electric conduction and heat conduction properties and relatively high thermal stability and high-temperature oxidation resistance.

This invention discloses a chip transfer mechanism and a chip transfer method. The chip transfer mechanism includes a transfer substrate with a through-groove extending from the upper surface to the lower surface. The shape of the through-groove is adapted to the shape of the chip, allowing the chip to be accommodated within it. The sides of the through-groove form a frame along the chip's edge. A fixing film is also included, positioned along the junction of the frame and the chip. Part of the fixing film is adhered to the chip, and another part is adhered to the frame, allowing the chip to be transferred synchronously while the frame is being transferred. By providing a through-groove on the transfer substrate, the chip is directly accommodated within the groove, eliminating the need for edge clamping. This significantly improves the utilization rate of chip material, increasing it by more than 10%. This transfer mechanism is particularly suitable for chip manufacturing and transfer scenarios requiring high material utilization.

The invention discloses a magnesium-based cobalt precipitation agent and a preparation method and application thereof, and relates to the technical field of composite materials. The method comprises: subjecting a first magnesium ore to calcination dissociation, enhanced leaching, carbonization separation, efficient pyrolysis, solid-liquid separation, and dry calcination to obtain active magnesium oxide; subjecting a second magnesium ore to calcination dissociation, hydration and impurity removal, solid-liquid separation, and low-temperature calcination to obtain high-purity magnesium oxide; mixing and modifying active magnesium oxide and high-purity magnesium oxide to obtain a magnesium-based cobalt precipitation agent; the mass ratio of active magnesium oxide to high-purity magnesium oxide is 1:2-10, the modifier is a quaternary ammonium salt organic powder, and the amount of the modifier added is 0.02-1% of the total mass of magnesium oxide. The magnesium-based cobalt precipitation agent prepared by the method has high activity, and has the advantages of high efficiency, low price, low unit consumption, and environmental friendliness in the wet smelting of nickel and cobalt in copper-cobalt ore and laterite nickel ore, and can greatly reduce the material cost in the production process of nickel and cobalt hydroxide.

The invention discloses a novel operation method for performing drug sensitivity test on breast cancer organoid, and particularly relates to the technical field of breast cancer organoid drug determination, which comprises the following steps: step 1, obtaining a fresh enough breast cancer tissue sample through needle biopsy; 2, immediately putting the tissue sample into a sterile container containing a culture medium, keeping the activity of cells, and gently washing the sample with sterile normal saline to remove bloodstains and pollutants on the surface; and step 3, cutting the tissue sample into small blocks to facilitate subsequent digestion and separation, digesting at 37 DEG C by using digestive enzymes until the tissue blocks are dispersed into cell clusters, and performing cell activity detection by using a trypan blue staining method to ensure that the activity and quantity of cells meet experimental requirements. According to the invention, the test precision of the drug sensitivity test on the breast cancer organoid is high enough, and the test is carried out in seven concentration gradients at an interval of 25 [mu] M, so that the test result is accurate enough, and the subsequent use of drugs is facilitated.

The invention relates to the technical field of catalysts, and discloses a positive isomerization catalyst and a preparation method and application thereof, the catalyst comprises an active matrix and an active metal component loaded on the active matrix; wherein the active matrix comprises an acidic active component SO4 < 2-> / ZrO2, an all-silicon molecular sieve with an MFI structure and aluminum oxide; the active metal component is selected from at least one of noble metal elements; wherein in the catalyst, the density of the strong acid center is 0.1-1 [mu] mol / m < 2 >. The catalyst has appropriate density of a strong acid center, has high isomerization activity and normalization activity, can be applied to an isomerization reaction or a normalization reaction of C4-C6 light hydrocarbons, has high conversion rate and selectivity, and is good in stability.

The invention provides a cylindrical lithium battery. A roll core of the cylindrical lithium battery is provided with a positive electrode flattening structure and a negative electrode flattening structure which are formed by flattening a full-tab cutting and stacking structure, the full-tab cutting and stacking structure comprises a current collector base material, the current collector base material is divided into a material area and a tab area, the material area is used for coating a polar material, the current collector base material is provided with a plurality of tabs which are arranged at intervals in the length direction, and the tabs are arranged in the material area. The width of the edge, facing the material area, of each tab is W2, the distance between the edges, facing the material area, of every two adjacent tabs is W3, the range of W3 / W2 is 20-30%, and the included angle beta between the edge connected with the edge, facing the material area, of each tab and the width direction of the current collector base material is 14-18 degrees. By optimizing and selecting the die-cutting tab width W2 and the tab distance W3 and selecting the included angle beta between the beveled edge of the tab and the width direction of the current collector base material to be 14-18 degrees, the cycle performance and the safety performance of the battery can be improved.

The invention belongs to the technical field of alkali liquor hydrogen production through electrolysis, particularly relates to an alkali liquor electrolytic bath for hydrogen production through electrolysis of water, and aims at solving the problem that in the prior art, when alkali liquor hydrogen production is carried out, electrification of a pole piece in each electrolysis chamber is arranged in a pole piece, and electrification of a single electrolysis chamber in the electrolysis process is abnormal. The main frame comprises a first end pressing plate and a second end pressing plate which are identical in appearance structure and symmetrical to each other, and a first annular protruding edge and a second annular protruding edge which are identical in diameter and thickness are reserved on the opposite sides of the first end pressing plate and the second end pressing plate respectively. Three aligning penetrating rods distributed in a central symmetry mode are fixed to the side, close to the first end pressing plate, of the second annular protruding edge. According to the device, electrolysis interruption caused by corrosion of an internal capillary circuit due to long-term electrolysis of a traditional embedded circuit can be prevented, and the circuit of each electrolysis unit is independently exposed to be electrified, so that circuit detection and maintenance can be performed more easily.

The invention provides a carbon block for slicing and a forming method thereof, and relates to the technical field of carbon block production, the raw materials comprise a first coke material, a second coke material, a third coke material, a fourth coke material, a fifth coke material, asphalt and modified powder; the modified powder is graphite powder, and the final temperature of a flame path is controlled to be 1140-1160 DEG C in the roasting process. According to the preparation method, the graphite powder modified powder is added in the carbon block forming process, meanwhile, the roasting process is adjusted, and the final temperature of a flame path is increased, so that the resistivity of the carbon block for slicing is as low as 50 omega.m, and the carbon block serves as a carrier for calcining a negative electrode material, so that energy is saved in the calcining process.