8results about How to "Increase the outer surface area" patented technology

The invention relates to the technical field of spaceflight measurement and control phased-array antennas, aims to solve the problems that an existing antenna is few in tracking measurement and control flying targets and limited in beam scanning range, and provides a planar subarray distributed omnidirectional phased-array antenna which comprises an antenna framework, a wave control system and a plurality of antenna subarrays. The antenna framework is provided with a plurality of windows, each window is internally provided with an antenna sub-array, and the windows are matched with the antenna sub-arrays; each antenna sub-array comprises a beam forming network, a duplexer, a multi-channel TR, a signal processing module and n * n antenna array elements arranged in an array, and n is an integer greater than or equal to 2; the wave control system is arranged in the antenna skeleton and is used for performing in-phase superposition on signal energy of each antenna array element in different target projection areas on an expected point and performing phase-shifting shunt control to realize full-airspace multi-beam signal receiving and transmitting; the omnidirectional phased-array antenna is wide in beam scanning range and can realize multi-target measurement and control.

The invention belongs to the technical field of secondary battery negative electrode materials, and particularly relates to a silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material comprises a silica frame main body structure, doped metal elements and a surface carbon coating layer. The method comprises the following steps: mixing a silicon-based compound, a metal oxide, a template agent and water, stirring at high temperature, roasting and activating at high temperature to obtain a precursor, and performing surface carbon coating on the precursor to obtain the silicon-based negative electrode material. The negative electrode material is applied to preparation of lithium ion batteries and sodium ion batteries. The silicon-based negative electrode material is nanoparticles, has a relatively large outer surface area and relatively high surface activity and is more beneficial to storage of lithium ions and sodium ions, meanwhile, the nanoparticles have a shorter diffusion path in size and are beneficial to diffusion of the lithium ions and the sodium ions, and the conductivity of the electrode material can be improved by doping metal elements and coating the surface with carbon. The material has zero strain characteristic, high energy density and excellent cycle performance in lithium ion batteries and sodium ion batteries.

This invention belongs to the field of solar water evaporation technology, and discloses a high-efficiency solar water evaporator, its preparation method, and its application. The preparation method includes the following steps: (1) Clean and dry coconut fibers, take multiple coconut fibers and weave them into a rope, and then cut them into coconut fiber ropes of the same length; (2) Embed the above-mentioned coconut fiber ropes of the same length into a sponge in an m×n array, wherein the lower end of the coconut fiber rope is flush with the bottom surface of the sponge, while its upper end protrudes from the top surface of the sponge by a certain height; (3) Immerse the part of the above-mentioned coconut fiber rope array protruding from the top surface of the sponge in a sodium alginate solution containing carbon black for surface coating treatment, and then take it out and air dry naturally to obtain a high-efficiency solar water evaporator based on a coconut fiber array. This invention has the characteristics of wide material sources, low cost, simple evaporator construction method, and high water evaporation rate, and has better prospects for large-scale preparation and commercial application.

The utility model discloses a kind of air-conditioning gas compressors of high efficiency heat dissipation, it is related to gas compressor technical field, and it includes: air compressor;Face expanding mechanism, it is equipped with two groups, two groups face expanding mechanism are all located on air compressor, to increase the contact area of air compressor and outside, each group face expanding mechanism includes laminating plate and multiple face expanding teeth, laminating plate is wrapped and set on the outer surface of air compressor, multiple face expanding teeth are equidistant fixedly connected on laminating plate;Butt joint mechanism, it is equipped with two groups.The air-conditioning gas compressor of high efficiency heat dissipation, by the use of face expanding mechanism, can increase the outer surface area of air compressor, improve the effect of heat transfer, improve the cooling effect in the use process of air compressor, ensure use, the air-conditioning gas compressor of high efficiency heat dissipation, by the use of liquid cooling mechanism, can be circulated, reduce the temperature of face expanding tooth, ensure the temperature in the use process of air compressor, and simple structure, easy to use.

The invention provides a carbon-modified alumina carrier, a catalyst, a preparation method of the carbon-modified alumina carrier, a preparation method of the catalyst and a method for deeply removing trace CO. The specific surface area of the alumina carrier is greater than or equal to 300m < 2 > / g, and the pore volume is 1.0-3.5 m < 3 > / The preparation method comprises the following steps: preparing sodium hydroxide and sodium metaaluminate into a sodium metaaluminate solution, adding the sodium metaaluminate solution into an aluminum sulfate solution to obtain a boehmite precursor, crystallizing to obtain boehmite, adding the boehmite into a nitrogen-containing polymer solution, dipping, reacting, and roasting the obtained reaction product in a protective gas atmosphere to obtain the nitrogen-containing polymer. The carbon modified alumina carrier is obtained; and contacting the carbon-modified alumina carrier with an impregnation liquid containing an active component, taking out the impregnated carbon-modified alumina carrier, and carrying out second roasting in a protective gas atmosphere to obtain the catalyst, and carrying out contact reaction on a material containing CO and the obtained catalyst to remove CO. According to the prepared catalyst, the large specific surface of the carrier enables the loading capacity of the catalyst to be large, and the dispersity of active metal is high.

This invention provides a carbon-modified alumina support, a catalyst, its preparation method, and a method for deep removal of trace amounts of CO. The specific surface area of ​​the alumina support is ≥300 m². 2 / g, pore volume 1.0~3.5m 3 / g. The preparation method includes: first, preparing a sodium aluminate solution from sodium hydroxide and sodium aluminate, adding it to an aluminum sulfate solution to obtain a boehmite precursor, crystallizing it to obtain boehmite, then adding it to a nitrogen-containing polymer solution, impregnating it, and reacting it. The resulting reaction product is calcined under a protective atmosphere to obtain the carbon-modified alumina support; contacting it with an impregnation solution containing active components, removing the impregnated carbon-modified alumina support, and then subjecting it to a second calcination under a protective atmosphere to obtain the catalyst; and then reacting the CO-containing material with the obtained catalyst to remove CO. The catalyst prepared by this invention has a large specific surface area of ​​support, resulting in a large catalyst loading and high dispersion of active metals.

The present invention relates to a method for producing a two-dimensional nickel silicate molecular sieve catalyst for dry reforming of methane, wherein a catalyst containing a two-dimensional wide external surface area and nickel bonded to the surface area and having structural stability and activity is produced through hydrothermal treatment in one step.

The utility model discloses a forest land fertilizing device, and relates to the technical field of fertilizing devices, the forest land fertilizing device comprises a fertilizing main body, the fertilizing main body comprises: an outer cylinder, the outer cylinder can be inserted into soil; the inner containing rod is arranged in the outer cylinder body in the middle axis direction of the outer cylinder body, and a medicine storage space is formed between the inner containing rod and the outer cylinder body; the liquid leakage holes are distributed in the lower portion of the outer cylinder body in the circumferential direction of the outer cylinder body, so that liquid medicine in the medicine storage space enters soil from the liquid leakage holes; and the piston is arranged at the upper end in the outer cylinder body, and a middle hole used for allowing the inner content rod to penetrate through is formed in the middle of the piston. According to the forest land fertilizing device, the fertilizing area is enlarged after the forest land fertilizing device is inserted into soil once, so that the fertilizing efficiency is improved; when the piston moves downwards, the liquid medicine is discharged from the liquid leakage hole at a certain initial speed, so that the walking path of the discharged liquid medicine is increased, and the permeability of the liquid medicine in the state is better.