Abstract: The disclosure discloses a polycrystalline diamond composite sheet having a continuous gradient transition layer and a 3D printing preparation method thereof. The polycrystalline diamond composite sheet consists of a polycrystalline diamond layer, a continuous gradient transition layer, and a cemented carbide substrate from top to bottom, in which the continuous gradient transition layer consists of diamond and cemented carbide. Along a direction from the cemented carbide substrate to the polycrystalline diamond layer, a content of the cemented carbide in the continuous gradient transition layer decreases from 100% to 0, and a content of the diamond increases from 0 to 100%. By designing and combining the continuous gradient transition layer with 3D printing technology, the disclosure realizes a continuous change in the two materials of diamond and cemented carbide, thereby eliminating the sudden change interface of the materials inside the diamond composite sheet.

Abstract: The disclosure discloses a polycrystalline cubic boron nitride composite sheet having a continuous gradient structure and a preparation method thereof. The polycrystalline cubic boron nitride composite sheet consists of a cemented carbide substrate, a continuous gradient layer, and a CBN layer from bottom to top. The continuous gradient layer contains cemented carbide and CBN, a content of CBN increases in continuous gradient from bottom to top, while a content of the cemented carbide decreases in continuous gradient from bottom to top. A volume fraction D of CBN and a volume fraction M of cemented carbide in the continuous gradient layer both satisfy exponential gradient functions. At the same time, the disclosure uses direct ink writing 3D printing technology with slurry to realize the preparation of the polycrystalline cubic boron nitride composite sheet having the continuous gradient structure.

Abstract: The present disclosure provides an anode and a preparing method therefor, and a lithium ion battery. The method for preparing an anode includes: coating anode slurry on a surface of a current collector to obtain a current collector including an anode slurry layer, where the anode slurry includes a conductive agent, an anode active material, an adhesive and a solvent; and performing point discharge on the current collector including the anode slurry layer, to cause the anode active material and the conductive agent to arrange in direction of an electric field, and then drying to obtain the anode. By means of the above method, the conductivity, energy density and rate capability of a battery can be enhanced without increasing the cost of raw materials and formulations.

Abstract: An antenna according to an embodiment of the present disclosure includes a first substrate, the first substrate includes: a first base substrate; at least one first radiation unit on a side of the first base substrate; a first electrode layer on a side of the first base substrate away from the at least one first radiation unit; and at least one second radiation unit on a side of the at least one first radiation unit away from the first electrode layer; wherein an orthographic projection of each second radiation unit on the first base substrate at least partially overlaps an orthographic projection of one first radiation unit on the first base substrate; and an orthographic projection of the at least one first radiation unit on the first base substrate is within an orthographic projection of the first electrode layer on the first base substrate.

Abstract: A transparent antenna includes a first substrate and a second substrate oppositely arranged; the first substrate includes: a first dielectric layer having a first surface and a second surface oppositely arranged; at least one first radiation part on the second surface; at least one feeding structure on the second surface and feeding the first radiation part; the second substrate includes: a second dielectric layer having a third surface opposite to the second surface and a fourth surface oppositely arranged; at least one second radiation part on the fourth surface, an orthographic projection of each second radiation part on the first surface at least partially overlaps an orthographic projection of one first radiation part on the first surface.

Abstract: The present invention discloses a tripeptide propylene oxide derivative or a pharmaceutically acceptable salt thereof, and a preparation method and application thereof. The structure of the tripeptide propylene oxide derivative is shown in formula I. Compared with the prior art, the present invention provides tripeptide epoxy ketone compounds with a novel structure and a function of inhibiting proteasome. As 20S proteasome inhibitors, the tripeptide epoxy ketone compounds can block tumor cell proliferation and induce tumor cell apoptosis, so the tripeptide epoxy ketone compounds can be used for the treatment and prevention of a plurality of human and animal diseases such as malignant tumors, and the effect is significantly better.

Abstract: The present disclosure provides a sodium ion cathode electrode material, a preparation method thereof, and a sodium ion battery. The sodium ion cathode electrode material includes a manganese-based cathode electrode material and a coating layer coated on the manganese-based cathode electrode material. A general chemical formula of the manganese-based cathode electrode material is NaxMnyM1-yO2, herein M is selected from any one of Cu, Fe, Co, and Ni, and 0.5?x?1, 0.5?y?1, the coating layer is a lithium-containing ternary material, and a general chemical formula of the lithium-containing ternary material is LiNiaCobMncO2, 0<a<1, 0<b<1, 0<c<1, and a+b+c=1. In the present application, a lithium source containing the lithium ternary material is used as a sacrificial agent to generate a part of SEI, thereby the loss of an active sodium source in the manganese-based cathode electrode material is reduced, and the electrical properties of the sodium ion cathode electrode material are improved.

Abstract: A dual-polarized antenna and an electronic device, relates to the technical field of mobile communication. The dual-polarized antenna includes: a radiation unit including a first substrate and a radiation pattern disposed on a side of the first substrate; and a feed unit including a second substrate, wherein the second substrate is disposed on a side of the first substrate away from the radiation pattern; and the radiation unit is electrically connected to the feed unit. The present application provides a dual-polarized antenna with compact space, high structural stability and omni-directional coverage of signals on the horizontal plane by adopting a stacking structure.

Abstract: The disclosure relates to a polycrystalline diamond composite sheet having a ripple-shaped gradient layer and a preparation method thereof. The polycrystalline diamond composite sheet consists of a cemented carbide substrate, a ripple-shaped gradient layer of a multi-layer structure, and a polycrystalline diamond layer from bottom to top. In the ripple-shaped gradient layer, a content of polycrystalline diamond increases from bottom to top, and a content of cemented carbide decreases from bottom to top. In the ripple-shaped gradient layer, an amplitude of a ripple-shaped structure is 0.2 to 0.6 mm, a wavelength is 1 to 2 mm, a spacing between an upper ripple and a lower ripple of a top layer is set to a gradient of (t/2 to t) mm to t mm from a peak to a trough, and spacings between an upper ripple and a lower ripple of remaining layers are all t mm, wherein t is 0.05 to 0.4.

Abstract: An transparent antenna includes a first substrate and a second substrate oppositely arranged; the first substrate includes: a first dielectric layer having a first surface and a second surface oppositely arranged; a reference electrode layer on the first surface; at least one first radiation part on the second surface and having a orthographic projection on the first surface at least partially overlapping an orthographic projection of the reference electrode layer on the first surface; at least one feeding structure on the second surface and feeding the first radiation part; the second substrate includes: a second dielectric layer having a third surface opposite to the second surface and a fourth surface oppositely arranged; at least one second radiation part on the fourth surface, an orthographic projection of each second radiation part on the first surface is within an orthographic projection of one first radiation part on the first surface.

Abstract: An antenna is provided, and belongs to the field of communication technology and includes a first dielectric substrate, a first conductive layer, a second dielectric substrate, a second conductive layer, a third dielectric substrate and a conductive third layer which are sequentially stacked. The first conductive layer includes at least one first and second feed lines; the second conductive layer is provided with at least one first and second openings; the third conductive layer includes at least one first radiation part. Orthographic projections of any two of a first opening, a first feed line, a first radiation part corresponding to each on the other first dielectric substrate overlap with other; each an orthographic projection of a first radiation part on the first dielectric substrate intersects with that of each of a corresponding first and second feed lines on the first dielectric substrate.

Abstract: An antenna includes a first substrate and a second substrate oppositely arranged; the first substrate includes: a first dielectric substrate having a first surface and a second surface oppositely arranged; a reference electrode layer on the first surface; at least one first radiation part on the second surface and having an orthographic projection on the first dielectric substrate at least partially overlapping that of the reference electrode layer; and at least one feeding structure on the second surface, electrically connected to the first radiation part, and having an orthographic projection on the first dielectric substrate at least partially overlapping that of the reference electrode layer; the second substrate includes: a second dielectric substrate opposite to the second surface; and at least one second radiation part on the second dielectric substrate, and each having an orthographic projection on the first surface within that of one first radiation part.

Abstract: The present disclosure provides a transparent antenna and a communication system, and belongs to the field of communication technology. The transparent antenna of the present disclosure includes: a first backplane and at least one radiating structure. The first backplane includes a first dielectric layer, a first electrode layer, a plurality of first transmission lines and a plurality of second transmission lines. The radiating structure includes a first antenna dielectric plate and a second antenna dielectric plate, where the first antenna dielectric plate includes a second dielectric layer, a first radiating element and a first balun feed structure. The second antenna dielectric plate includes a third dielectric layer, a second radiating element and a second balun feed structure.

Abstract: The present disclosure provides a transparent antenna and a communication system, and belongs to the field of communication technology. The transparent antenna of the present disclosure includes: a first backplane and at least one radiating structure. The first backplane includes a first dielectric layer, a first electrode layer, a plurality of first transmission lines and a plurality of second transmission lines. The radiating structure includes a first antenna dielectric plate and a second antenna dielectric plate, where the first antenna dielectric plate includes a second dielectric layer, a first radiating element and a first balun feed structure. The second antenna dielectric plate includes a third dielectric layer, a second radiating element and a second balun feed structure.

Abstract: An antenna according to an embodiment of the present disclosure includes a first substrate, the first substrate includes: a first base substrate; at least one first radiation unit on a side of the first base substrate; a first electrode layer on a side of the first base substrate away from the at least one first radiation unit; and at least one second radiation unit on a side of the at least one first radiation unit away from the first electrode layer; wherein an orthographic projection of each second radiation unit on the first base substrate at least partially overlaps an orthographic projection of one first radiation unit on the first base substrate; and an orthographic projection of the at least one first radiation unit on the first base substrate is within an orthographic projection of the first electrode layer on the first base substrate.

Abstract: An transparent antenna includes a first substrate and a second substrate oppositely arranged; the first substrate includes: a first dielectric layer having a first surface and a second surface oppositely arranged; a reference electrode layer on the first surface; at least one first radiation part on the second surface and having a orthographic projection on the first surface at least partially overlapping an orthographic projection of the reference electrode layer on the first surface; at least one feeding structure on the second surface and feeding the first radiation part; the second substrate includes: a second dielectric layer having a third surface opposite to the second surface and a fourth surface oppositely arranged; at least one second radiation part on the fourth surface, an orthographic projection of each second radiation part on the first surface is within an orthographic projection of one first radiation part on the first surface.

Abstract: The present invention discloses a tripeptide propylene oxide derivative or a pharmaceutically acceptable salt thereof, and a preparation method and application thereof. The structure of the tripeptide propylene oxide derivative is shown in formula I. Compared with the prior art, the present invention provides tripeptide epoxy ketone compounds with a novel structure and a function of inhibiting proteasome. As 20S proteasome inhibitors, the tripeptide epoxy ketone compounds can block tumor cell proliferation and induce tumor cell apoptosis, so the tripeptide epoxy ketone compounds can be used for the treatment and prevention of a plurality of human and animal diseases such as malignant tumors, and the effect is significantly better.