6results about How to "Increase the transmission path" patented technology

The application relates to a porous SiCN nw composite wave-absorbing ceramic and a preparation method thereof, and belongs to the field of ceramic-based wave-absorbing materials. The porous SiCN nw composite wave-absorbing ceramic comprises a porous Si3N4 ceramic matrix, a carbon layer uniformly wrapped on the pore wall surface of the porous Si3N4 ceramic matrix, and SiCN nanowires uniformly grown in the pores of the porous Si3N4 ceramic matrix; wherein the total mass of the carbon layer and the SiCN nanowires is 1-10 wt% of the porous Si3N4 ceramic matrix. By introducing the carbon layer and the SiCN nanowires with different structures into the pore structure of the Si3N4 matrix ceramic, the two components of the wave-absorbing phase can synergistically exert the advantages of each component, optimize the impedance matching degree of the material, and broaden the absorption bandwidth of the material. Moreover, the process is simple, the proportion of the two wave-absorbing phases can be regulated by changing the heat treatment temperature, the impedance matching degree of the material is optimized, and the prepared porous SiCN nw composite ceramic has good wave-absorbing performance.

The invention relates to the field of functional materials, in particular to a preparation method and application of a kapok-based porous material with a radiation cooling function. According to the method, natural kapok short fibers are subjected to constant-temperature alkali treatment to peel off wax on the surface layer, a delignification reaction is carried out with an acidic sodium chlorite solution, and the kapok-based porous material with the radiation cooling function is obtained. And the coarse reticular cellulose structure in the material is thoroughly exposed. The treated active fibers and nano cellulose are subjected to high-strength blending in a water phase, nano fibrils are guided to deeply penetrate into gaps of a micron-sized kapok skeleton, and a tightly-meshed composite system is constructed. And dropwise adding an organosiloxane reagent into the acidic liquid phase to complete surface hydrophobic modification, and carrying out controlled low-temperature setting and vacuum freezing sublimation dehydration to form the three-dimensional base material containing a micro-nano dual-pore network. The material can effectively reflect sunlight and emit heat radiation through an atmosphere window, zero-energy-consumption passive radiation cooling is achieved, and meanwhile the excellent heat insulation performance is achieved.

The application relates to a resistance conductive material and a preparation method and application thereof, wherein the resistance conductive material comprises, from bottom to top, a copper foil layer, a transition layer and a resistance layer; the resistance layer comprises a dispersion reinforcing phase and a homogeneous phase; the dispersion reinforcing phase is subjected to surface pretreatment before being added into an electroplating solution. Through the introduction of the transition layer and the dispersion reinforcing phase, the diffusion of copper into the resistance layer is inhibited, the high resistivity of the resistance layer is maintained, and the application prospect is good.

The invention relates to the technical field of semiconductor optoelectronic materials, in particular to a heterojunction photoelectric material based on the in-situ self-reduction surface plasma resonance effect, a preparation method and application, and the technical points are as follows: MoS2 quantum dots are deposited on a substrate, and a Cs2AgBiI6 nanosheet with a selectively exposed (100) crystal face is prepared by a low-temperature solvothermal method to obtain a Cs2AgBiI6 (100) nanosheet; cs2AgBiI6 (100) nanosheets are deposited on a MoS2QDs-substrate through a spin-coating method to prepare a Cs2AgBiI6 (100) / MoS2 QDs-substrate, a reducing agent is sprayed on the surface of the Cs2AgBiI6 (100) / MoS2 QDs-substrate, Ag elementary substances are generated through in-situ reduction, the heterojunction photoelectric material is obtained, an all-inorganic heterojunction system is constructed, the plasma resonance effect is introduced, and collaborative improvement of wide spectral response, high sensitivity, rapid response and high stability is achieved.

The embodiment of the application discloses an optical-mechanical system, which comprises a light emitting assembly, a light receiving assembly and a light scanning assembly. The light scanning assembly comprises a first light scanning element and a second light scanning element. The emitted light signal is transmitted by the first light scanning element and the second light scanning element in sequence and then emitted to a target object. Along a first straight line direction, the second light scanning element is located between the first light scanning element and the light emitting assembly. And / or, the echo light signal is transmitted by the second light scanning element and the first light scanning element in sequence and then reaches the light receiving assembly. Along the first straight line direction, the second light scanning element is located between the first light scanning element and the light receiving assembly. The optical-mechanical system can make the emission position of the emitted light signal and / or the incidence position of the echo light signal be located in the middle of the optical-mechanical system, which is beneficial to realize the calibration of the optical-mechanical system and the symmetry of the close-range point cloud.

The invention provides a modified positive electrode material and a preparation method thereof, a positive electrode and a lithium ion battery. The modified positive electrode material comprises an inner core and a porous carbon coating layer arranged on the surface of the inner core, the inner core has a general formula of LiMnxFe1-x-yCoyPO4, x is greater than or equal to 0.3 and less than or equal to 0.8, and y is greater than or equal to 0.01 and less than or equal to 0.03; the material of the porous carbon coating layer comprises nitrogen-doped porous carbon and reduced graphene oxide. Porous carbon is combined with reduced graphene oxide, so that a three-dimensional conductive framework is linked with a two-dimensional conductive sheet layer to form a three-dimensional conductive network, the conductivity of the modified positive electrode material is remarkably improved, and the volume expansion of the modified positive electrode material in the charge-discharge cycle process is relieved; the doping of Co ions can shorten the M-P bond (M = Mn and / or Fe, and P is phosphorus in phosphate radical), reduce the unit cell volume and broaden the lithium ion transmission path, thereby improving the rate capability and cycle performance of the lithium ion battery.