51results about How to "Good channel" patented technology

The invention relates to a nickel foam-loaded silver-doped nickel-based bimetallic hydroxide electrocatalytic hydrogen evolution catalyst and a preparation method thereof. The catalyst takes foam nickel as a carrier, nickel-based bimetallic hydroxide of a laminated structure is uniformly arranged and grows on the surface of foam nickel, and nano-silver particles are uniformly attached to the surface of the nickel-based bimetallic hydroxide. The nickel foam-loaded silver-doped nickel-based bimetallic hydroxide electrocatalytic hydrogen evolution catalyst takes three-dimensional porous foam nickel of a net structure as a carrier, the nickel-based bimetallic is combined with the carrier firmly, distribution is uniform, the catalyst has the good catalytic hydrogen evolution effect under the alkaline condition, and the stable catalytic activity can be kept in a long time.

The invention relates to a manganese oxide material, and belongs to the technical field of catalytic materials and environmental protection. The manganese oxide material comprises manganese dioxide, wherein the valence form of the manganese element includes divalent manganese and tetravalent manganese; the proportion between divalent manganese and tetravalent manganese is 0<Y(Mn<2+>)/Y(Mn<4+>)<1.The manganese oxide material has a ball-shaped structure formed by nanorods and a favorable pore canal. The manganese oxide material has the advantages that the heat endurance in use is good; the specific surface area is large; the adsorption capability and the ion exchange capacity is strong; the catalytic activity under a high humidity condition is high; the life is long; hazardous materials such as CO (carbon monoxide), VOCs (volatile organic compounds), O3 (ozone) and the like can be solely removed or removed at the same time; staphylococcus and the like can be killed. The manganese oxidematerial preparation method has the advantages of being green and environmentally friendly, simple and easy to perform, extensive in raw material resource, low in cost, and easy for realizing industrialization.

Packets may be routed in a heterogeneous communications network as follows: for a set of packets comprising at least one packet to be transmitted from a sending node, said sending node being able to handle communication according to at least two access technologies, —selecting in a selection unit in the sending node an access technology for use when transmitting the set of packets, —selecting a receiving node in the network to which to transmit the set of packets among nodes in the network that are able to handle said selected access technology—transmitting the set of packets to the selected receiving node using the selected access technology. Alternatively, a set of packets may be transmitted to one or more nodes using at least two different access technologies. Depending on the transmission quality, one node may be selected to forward the set of packets.

The invention relates to a preparation method of an iron, cobalt and nitrogen co-doped carbon nanofiber catalyst. The preparation method comprises the following steps: firstly, preparation of an electrostatic spinning precursor solution, respectively adding cobalt salt, zinc salt and iron salt into an organic solvent to obtain a solution A, and adding a high polymer into the organic solvent to obtain a solution B; adding the solution A into the solution B and uniformly mixing; secondly, preparation of polymer nanofibers: preparing the polymer nanofibers by using an electrospinning technology and the electrostatic spinning precursor solution; thirdly, preparation of a catalyst: carrying out heat treatment on the polymer nanofibers to obtain the catalyst. Compared with the prior art, the preparation method of the iron, cobalt and nitrogen co-doped carbon nanofiber catalyst, disclosed by the invention, has the advantages of simple steps, easiness in operation and controllable implementation conditions; the iron, cobalt and nitrogen co-doped carbon nanofiber catalyst can be obtained without a template or activation etching; in addition, the iron, cobalt and nitrogen co-doped carbon nanofiber catalyst has oxygen reduction performance similar to that of commercial platinum carbon, and has the advantages of low cost, high efficiency, no pollution and capability of being used as a cathode catalyst for an alcohol fuel cell.

A user device includes a display screen and one or more processors. The display screen is configured to display content to a user. The one or more processors are configured to pre-load a user application by running at least part of a program code of the user application in a background, including enabling the program code of the user application to pre-render a visual display of the user application in the background, and, in response to the user accessing the user application, to transfer the pre-rendered visual display to a foreground, thereby displaying the visual display to the user on the display screen.

The invention discloses a three-dimensional comprehensive, efficient and accurate treatment technique for a coal oil-gas coexistent mine. The technique comprises the following steps: S10, calculatingcoal seam gas geological reserves and surrounding rock oil-gas geological reserves; S20, establishing a reasonable borehole arrangement parameter model; S30, constructing a directional long borehole along the coal seam in the coal seam, and performing sectional hydraulic fracturing construction; S40, comprehensively evaluating the treatment effect by monitoring drainage data and combining with parameters such as drainage up-to-standard period, and providing a design basis for the treatment area under similar geological conditions. A multi-dimensional surrounding rock oil-gas-coal seam gas comprehensive drainage control technique aiming at disasters of the coal oil-gas coexistent mine is formed, dynamic space-time three-dimensional drainage of mining space disaster gas is achieved, mining efficiency and gas drainage efficiency are improved, and the problem of mine gas disaster is fundamentally solved.

A user device includes a memory and one or more processors. The memory is configured to store one or more user applications installed in the user device. The one or more processors are configured to run an Operating System (OS) of the user device, including maintaining a data structure that tracks activity of the user applications, and to pre-load a user application before the user application is accessed by a user, including preventing the data structure from tracking the pre-loaded user application.

The invention discloses a carbon nanotube self-assembly nanofiber felt, a preparation thereof and an application in an all-vanadium redox flow battery. The carbon nanotube self-assembly nanofiber felt is prepared by taking a carbon nanotube as a body and macromolecule polymer as an assembly agent according to an electrostatic spinning method. A diameter of an optical fiber is 100-1000nm, a specific surface area is 30-1000m<2>.g<-1>, and the porosity is more than 90%. The carbon nanotube nanofiber felt material prepared by the preparation method is applied to the all-vanadium redox flow battery, and the excellent electrochemical performance is shown up. The carbon nanotube self-assembly nanofiber felt has the advantages of excellent preparation performance, simple technology, good technological repeatability, low cost and environmental friendliness.

A user device includes a memory and one or more processors. The memory is configured to store one or more user applications installed in the user device. The one or more processors are configured to select one or more operations, which are to be performed in normal launching of a user application but not in background pre-loading of the user application, to pre-load the user application before the user application is accessed by a user, including skipping the one or more selected operations, and to complete the one or more skipped operations in response to the user accessing the user application.

The invention discloses a method for processing a heavy hydrocarbon raw material by adopting up-flow reactors. The method comprises the following steps: at least one up-flow reactor is adopted, at least two catalyst bed layers are arranged in each up-flow reactor, and in each catalyst bed layer, a same hydrotreating catalyst is adopted; a carrier of the hydrotreating catalyst is spherical; the diameter of the carrier is 5.0 to 10.0 mm; wherein the carrier at least comprises seven channels penetrating through the carrier; the first channel, the second channel and the third channel penetrate through the sphere center of the catalyst carrier and are communicated with one another, every two channels are perpendicular to each other, the fourth channel, the fifth channel, the sixth channel and the seventh channel are connected end to end and communicated, and the total volume of the channels accounts for 20%-60% of the volume of the spherical carrier. The catalyst prepared by loading activemetal components on the catalyst carrier is high in void ratio, good in permeability and low in bed pressure, is particularly suitable for an up-flow residual oil hydrotreatment process, and has the characteristics of high hydrogenation activity, long service life and the like.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses an MOF uniformly coated lithium ion battery positive electrode material and a preparation method thereof, the preparation method comprises the following steps: S1, at room temperature, adding lithium ion battery positive electrode particles into a 2, 5-dihydroxy terephthalic acid solution to obtain a mixed solution, hydroxyl in the 2, 5-dihydroxy terephthalic acid is combined with residual alkali on the lithium ion battery positive electrode particles to form the lithium ion battery positive electrode particles coated with the 2, 5-dihydroxy terephthalic acid; and S2, adding a metal salt into the mixed solution, and reacting the 2, 5-dihydroxy terephthalic acid coated on the lithium ion battery positive electrode particles with metal ions to generate MOF, thereby obtaining the MOF uniformly coated lithium ion battery positive electrode material. The lithium ion battery positive electrode material uniformly coated with the MOF can be obtained through the preparation method, and the lithium ion battery positive electrode material has high specific capacity, good rate capability and stable cycle performance.

The invention discloses a residual oil hydrotreating catalyst carrier, a catalyst and a preparation method thereof. The residual oil hydrotreating catalyst carrier is spherical; the diameter is 2.5-10.0 mm; the outer surface of the carrier is provided with a plurality of large pore channels which are not communicated; the sectional area of the large pore channels is gradually reduced from outsideto inside along the radial direction; the area of the bottom surface of each large pore channel is 0.05%-5% of the surface area of the spherical carrier, the area of the total bottom surface of the large pore channels is 5%-50% of the surface area of the spherical carrier, and the longest depth of the large pore channels is 30%-99% of the radius of the spherical carrier in terms of the length of the pore channels in the radius direction of the spherical carrier. The catalyst prepared by loading an active metal component on the catalyst carrier is used in the residual oil hydrotreatment process, has the advantages of high porosity, good permeability, reduced bed pressure and uniform material distribution, is especially suitable for the residual oil hydrotreatment process, and has the characteristics of high hydrogenation activity, long service cycle and the like.

The invention provides a residual oil hydrotreatment catalyst carrier, a catalyst and a preparation method thereof. The residual oil hydrotreatment catalyst carrier is spherical, and the outer diameter of the carrier is 5.0-10.0 mm; the residual oil hydrotreatment catalyst carrier internally comprises at least eleven large pore channels, wherein the first, second, third and fourth large pore channels are arranged in the spherical carrier and are connected end to end to form a circle, a square, a quasi-circle or a quasi-square shape; the fifth and sixth large pore channels are crossed at the center of the spherical carrier, and the first to sixth large pore channels integrally form a pore channel shaped like a Chinese character 'tian' or a pore channel shaped like a Chinese character 'tian'; the seventh large pore channel is intersected with the fifth large pore channel and the sixth large pore channel, and penetrates through the spherical carrier through the sphere center; the eighth large pore channel, the ninth large pore channel, the tenth large pore channel and the eleventh large pore channel extend inwards from the spherical surface and intersect with the end-to-end connectingpositions of the first large pore channel, the second large pore channel, the third large pore channel and the fourth large pore channel respectively; and the total volume of the large pore channelsaccounts for 10-50% of the volume of the spherical carrier. The catalyst prepared by loading the active component on the catalyst carrier has the characteristics of high hydrogenation activity, long service life and the like.