Abstract: The present application relates to a box assembly including a paper bottom box, a paper floss bobbin, and a cover component including a paper upper holder, a paper cover body, and a floss cutter. The paper bottom box includes a first accommodating cavity in which the paper floss bobbin and at least a portion of the paper upper holder are located. The paper upper holder is detachably connected to the paper bottom box only by friction fit and includes a second accommodating cavity and an outlet opening. The paper cover body is hinged with the paper upper holder and flipped relative to the paper upper holder to switch between open and closed positions. The floss cutter is arranged on the paper cover body. In the closed position, the paper cover body covers the second accommodating cavity and the outlet opening.

Abstract: The present application relates to a box assembly. The box assembly includes a paper bottom outer box, a paper inner holder, a paper floss bobbin, a paper upper holder, a floss cutter, and a paper top cover. The paper bottom outer box includes a first accommodating cavity. The paper inner holder includes a second accommodating cavity. The paper inner holder is arranged in the first accommodating cavity. The paper inner holder is detachably connected to the paper bottom outer box by friction fit only. The paper floss bobbin is rotatably connected to the paper inner holder. The paper upper holder has an outlet opening. The outlet opening is in communication with the second accommodating cavity. The paper upper holder is detachably connected to the paper inner holder by friction fit. The paper upper holder is for opening or closing the second opening.

Abstract: A mesoporous cerium oxide nano-material and a preparation method and an application thereof are provided in the present disclosure, belonging to the technical field of porous materials. The preparation method includes the following steps: using porous organic frameworks material as a templating agent, impregnating and adsorbing cerium salt precursor under an action of alkali, and removing the templating agent by roasting pyrolysis to obtain the mesoporous cerium oxide nano-material. POFs is carbonized into mesoporous carbon materials by calcination in inert atmosphere, which supports the mesoporous channels of cerium oxide, and then the carbonized carbon materials of POFs are removed by calcination in air atmosphere, forming the mesoporous structure of cerium oxide. The mesoporous cerium oxide nano-material prepared by the present disclosure has a high specific surface area and mesoporous structure, and is used as a catalytic material or catalyst carrier.

Abstract: The present disclosure provides a preparation method of a mesoporous CeO2-loaded Au catalyst, products and applications thereof, and belongs to the technical field of fine organic chemical industry. According to the present disclosure, firstly, COFs material COFs-41 is employed to prepare mesoporous CeO2 carrier material with high specific surface area; then, Au nanoparticles loaded on the surface of mesoporous CeO2 carrier pores are anchored by impregnation-reduction method to produce Au@CeO2 catalyst with high specific surface area; and then, mesoporous Au@CeO2 catalyst with high specific surface area, aromatic alcohols are added to a reactor, anhydrous methanol is used as a solvent, and heating is carried out to react in an atmosphere of atmospheric oxygen for a certain period of time at room temperature, and this catalyst catalyzes the oxidative transesterification of aromatic alcohols for synthesis of aromatic esters in a highly selective manner.

Abstract: Provided are a packaging box and cardboard structure. The packaging box includes: a first box body including a first plate body and sidewall parts, where the first plate body includes a first opening, two ends of the first plate body along a first direction and two ends of the first plate body along a second direction are respectively connected with the sidewall parts, a portion of the sidewall parts parallels to a third direction, where the first, the second and the third directions are mutually perpendicular. The packing box further includes a second box body including a first receiving part in bending connection with a second receiving part. The first box body and the second box body are in two states.

Abstract: The present disclosure relates to a packaging box and a paperboard structure. The packaging box comprises a first packaging box body, an integral connecting portion, a second packaging box body and a switchable connecting portion which are connected end to end in sequence. The first packaging box body comprises a first accommodating portion formed by a first surface in a thickness direction of the first packaging box recessed inwardly. The second packaging box body comprises a second accommodating portion formed by a second surface in a thickness direction of the second packaging box recessed inwardly. A bendable connection is formed between the first packaging box body and the second packaging box body via the integral connecting portion and the switchable connecting portion, so that the first surface and the second surface are positioned to be opposite to each other.

Abstract: The present disclosure provides a flat plate member and a packaging box, the flat member includes a plurality of sidewall regions and a connection region connected between adjacent sidewall regions, the connection region is formed with a plurality of V-shaped grooves arranged at intervals in an arrangement direction of adjacent sidewall regions on a surface facing a first side. The plurality of V-shaped grooves extend along a direction of intersection lines between the sidewall regions and the connection region, and an included angle of the V-shaped grooves is set according to a slotting influence parameter, and the slotting influence parameter comprises at least one of a bending angle of the connection region, a material of the connection region, and a number of the V-shaped grooves.

Abstract: The present disclosure provides a flat plate member and a packaging box, the flat member includes a plurality of sidewall regions and a connection region connected between adjacent sidewall regions, the connection region is formed with a plurality of V-shaped grooves arranged at intervals in an arrangement direction of adjacent sidewall regions on a surface facing a first side. The plurality of V-shaped grooves extend along a direction of intersection lines between the sidewall regions and the connection region, and an included angle of the V-shaped grooves is set according to a slotting influence parameter, and the slotting influence parameter comprises at least one of a bending angle of the connection region, a material of the connection region, and a number of the V-shaped grooves.

Abstract: The present invention discloses a molecular sieve and its preparation method. The molecular sieve has micromorphology in a football shape and consists of molecular sieve framework and active elements. The molecular sieve framework comprises silicon element and aluminum element; the active elements comprise copper element and rare earth elements. The rare earth elements are one or more selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Sc and Y. The mass ratio of the silicon element to the aluminum element is 3-9:1. The content of the copper element in the molecular sieve is 1.5-3.2 wt %. The mass of rare earth elements is 50 ppm-2 wt % of the molecular sieve framework. The mass of the silicon element is calculated by silicon dioxide, the mass of aluminum element is calculated by aluminum oxide, the mass of copper element is calculated by copper oxides, and the mass of rare earth elements is calculated by rare earth oxides.

Abstract: The present disclosure relates to a packaging box and a paperboard structure. The packaging box comprises a first packaging box body, an integral connecting portion, a second packaging box body and a switchable connecting portion which are connected end to end in sequence. The first packaging box body comprises a first accommodating portion formed by a first surface in a thickness direction of the first packaging box recessed inwardly. The second packaging box body comprises a second accommodating portion formed by a second surface in a thickness direction of the second packaging box recessed inwardly. A bendable connection is formed between the first packaging box body and the second packaging box body via the integral connecting portion and the switchable connecting portion, so that the first surface and the second surface are positioned to be opposite to each other.

Abstract: Disclosed is a storage-type modular data center. The storage-type modular data center includes a box, a dust removing module, an evaporative cooling module, and an air supply module. The box is provided with an air inlet and an air outlet. A server is disposed between the air inlet and the air outlet. The dust removing module is disposed between the server and the air inlet. The evaporative cooling module is disposed between the server and the air inlet, and includes an evaporative media and a water sprinkling tray module. One end of the evaporative media is immersed in liquid contained in the water sprinkling tray module. The air supply module is operative to drive air to flow between the air inlet and the air outlet.

Abstract: Disclosed is a storage-type modular data center. The storage-type modular data center includes a box, a dust removing module, an evaporative cooling module, and an air supply module. The box is provided with an air inlet and an air outlet. A server is disposed between the air inlet and the air outlet. The dust removing module is disposed between the server and the air inlet. The evaporative cooling module is disposed between the server and the air inlet, and includes an evaporative media and a water sprinkling tray module. One end of the evaporative media is immersed in liquid contained in the water sprinkling tray module. The air supply module is operative to drive air to flow between the air inlet and the air outlet.

Abstract: The present invention discloses a molecular sieve and its preparation method. The molecular sieve has micromorphology in a football shape and consists of molecular sieve framework and active elements. The molecular sieve framework comprises silicon element and aluminum element; the active elements comprise copper element and rare earth elements. The rare earth elements are one or more selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Sc and Y. The mass ratio of the silicon element to the aluminum element is 3-9:1. The content of the copper element in the molecular sieve is 1.5-3.2 wt %. The mass of rare earth elements is 50 ppm-2 wt % of the molecular sieve framework. The mass of the silicon element is calculated by silicon dioxide, the mass of aluminum element is calculated by aluminum oxide, the mass of copper element is calculated by copper oxides, and the mass of rare earth elements is calculated by rare earth oxides.

Abstract: A method for preparing an SCR catalyst may include: (1) placing a first aqueous solution containing a titanium oxide and a tungstate in an electric field environment, adjusting the pH value of the first aqueous solution, and adjusting the current direction of the electric field environment to obtain a first mixture; (2) providing a second mixture by, in the electric field environment, adding dropwise a second aqueous solution containing a soluble salt of one or more active components, a copper-organic polyamine complex and a dispersant to the first mixture, and adjusting the current direction; and (3) processing the second mixture to obtain the SCR catalyst. The one or more active components may be selected from Ce, Zr, Cu, Fe, Pr and Sc.

Abstract: A file storage method and device are provided. The method includes: receiving a storage request for a to-be-stored file (S101); determining a target key for storing the to-be-stored file (S102); obtaining to-be-stored metadata of the to-be-stored file according to the determined target key (S103), wherein the to-be-stored metadata includes: fixed sub-metadata and variable sub-metadata; and storing the to-be-stored metadata in a metadata database, storing the fixed sub-metadata in a name of the determined target key, storing the variable sub-metadata in a preset storage area corresponding to the determined target key, and storing the to-be-stored file in a value of the determined target key (S104). By applying the file storage and device, the recovery of metadata is effectively ensured, while a storage space of a storage terminal is saved.

Abstract: A modular and flexible data center and method of operation enables installing and calibrating the data center during manufacture, such that the data center can be operational at a work site with minimal reconfigurations and optimal flexibility. The data center comprises a container body, a cooling apparatus, a ventilation pipe, and a server. The cooling apparatus is arranged in the container body. The ventilation pipe is arranged above the container body, communicating with the inside of container body via a first communication port and a second communication port, forming a sealed passage with the container body, wherein the first communication port and the cooling apparatus are located at one side of container body; and second communication port is located at the top of container body, away from the cooling apparatus. The server is located inside the container body and between the first communication port and the second communication port.

Abstract: A method for preparing an SCR catalyst may include: (1) placing a first aqueous solution containing a titanium oxide and a tungstate in an electric field environment, adjusting the pH value of the first aqueous solution, and adjusting the current direction of the electric field environment to obtain a first mixture; (2) providing a second mixture by, in the electric field environment, adding dropwise a second aqueous solution containing a soluble salt of one or more active components, a copper-organic polyamine complex and a dispersant to the first mixture, and adjusting the current direction; and (3) processing the second mixture to obtain the SCR catalyst. The one or more active components may be selected from Ce, Zr, Cu, Fe, Pr and Sc.

Abstract: A file storage method and device are provided. The method includes: receiving a storage request for a to-be-stored file (S101); determining a target key for storing the to-be-stored file (S102); obtaining to-be-stored metadata of the to-be-stored file according to the determined target key (S103), wherein the to-be-stored metadata includes: fixed sub-metadata and variable sub-metadata; and storing the to-be-stored metadata in a metadata database, storing the fixed sub-metadata in a name of the determined target key, storing the variable sub-metadata in a preset storage area corresponding to the determined target key, and storing the to-be-stored file in a value of the determined target key (S104). By applying the file storage and device, the recovery of metadata is effectively ensured, while a storage space of a storage terminal is saved.

Abstract: An economical and eco-friendly aluminum profile cabinet comprises a first frame, a second frame, two side plates, a door plate and a top plate. The first and second frames are formed by splicing three aluminum profiles, with two adjacent aluminum profiles being fixed by a fastener. A first end of each side plate is clamped in a clamping groove of the aluminum profile of the first frame, and a second end parallel with the first end is clamped in a clamping groove of the aluminum profile of the second frame corresponding to the aluminum profile of first frame. A first end of one side wall of door plate hinges to the aluminum profile of first frame. A second end of one side wall of door plate is hinged to the aluminum profile of the second frame. The top plate is clamped in clamping grooves from the first frame aluminum profile.

Abstract: A modular container comprises an integral rack, a side plate, a door plate and a top plate. The integral rack is formed by at least one rack. Each rack comprises at least three columns, an upper beam and a lower beam. The at least three columns are staggered in the horizontal direction and parallel in the vertical direction. Two ends of the upper beam are fixedly connected to top ends of two adjacent columns. The two ends of lower beam are fixedly connected to bottom ends of two adjacent columns. The side plate is between the upper beam and the lower beam located at the outer side of integral rack and opposite to each other. One side of the door plate is rotatably connected to the corresponding column located at the outer side of the integral rack. The top plate is located at the top end of integral rack.