47results about How to "Universal method" patented technology

The invention provides a three-frequency-band high-gain omnidirectional dipole antenna comprising a three-frequency oscillator array, balanced feeder lines, a first dielectric plate, a second dielectric plate, and a third dielectric plate. The first dielectric plate, the second dielectric plate, and the third dielectric plate are arranged successively from top to bottom. The balanced feeder lines are arranged at the top surface and the bottom surface of the second dielectric plate and are printed along the axis direction of a three-frequency oscillator unit. The balanced feeder lines are parallel dual-line transmission lines. The three-frequency oscillator units in the three-frequency oscillator array are printed at the first dielectric plate and the third dielectric plate; and feeding points among all three-frequency oscillator units are connected by the balanced feeder lines. The three-frequency oscillator units consist of upper arms and lower arms, wherein the upper arms and the lower arms are arranged in a mirror symmetry mode. The upper arms and the lower arms include first branches, second branches, and third branches, wherein the first, second, and third branches are arranged along parallel axes; the second branches and the third branches are arranged at the two sides of the first branches symmetrically and the bottoms are connected into one by horizontal branches; and balanced feeding points are formed at central protrusions of the upper arm and the lower arm. The three-frequency-band high-gain omnidirectional dipole antenna has advantages of high gain, omnidirectivity, high efficiency, small size, and low cost; and an effective or benefical reference is provided for an optimized design of other multi-frequency or broadband high-gain omnidirectional array antennas.

The invention provides a high-gain wideband microstrip patch antenna. The high-gain wideband microstrip patch antenna comprises a floor, a dielectric plate arranged on the floor and a main radiation patch, wherein the main radiation patch is positioned at the position with the distance of Hp above the ground, and is in a rectangular shape; a top parasitism patch is arranged at the position with the distance of Hs above the main radiation patch, and is in the rectangular shape as well; four rectangular horizontal parasitism patches are arranged at the positions with the distances of Dp on the outer side of the peripheral edge of the main radiation patch, the heights of the four rectangular horizontal parasitism patches from the floor are Hc, and the lengths and widths of the four rectangular horizontal parasitism patches are Ls and Ws; and a feeding point is arranged on the main radiation patch, and is connected to a feeding network of the dielectric plate. Namely, a distance is reserved between the main radiation patch and the floor, and a distance is reserved between the top parasitism patch and the main radiation patch. A base station antenna which is high in gain, wide in band, dual in polarization, low in sidelobe or free of sidelobe, high in cross polarization, high in isolation, wide in wave beam, miniaturized, low in profile, low in cost and easy to produce is provided for micro cellular mobile communication.

The invention discloses a Mars machine-machine separating orbit design method. The method comprises the following steps: S1. under a near focus coordinate system, establishing a Mars machine-machine separating orbit design equation taking landing orbit eccentricity as independent variable; and S2. by taking the minimum speed increment during orbit transfer of a landing machine as a target function, solving the Mars machine-machine separating orbit design equation by adopting a preset solving algorithm to obtain the landing orbit of the landing machine, thus completing the Mars machine-machine separating orbit design. According to the method, the minimum speed increment during orbit transfer as the target (landing through the shortest starting time of an engine), the constraint condition of an entrance angle when the landing machine enters Mars atmosphere can be met, and the method is simple and feasible and provides support for deep space detection machine-machine separation.

The invention provides a mini enhanced dual-polarization omnidirectional ceiling antenna. The antenna comprises a single cone, a horizontal polarization unit and a step-shaped floor which are arranged in a vertically coaxial and centrally overlapped manner from top to bottom successively, the single cone comprises a first single cone radiator and a second single cone radiator which are arranged in a crossing manner, the bottom of the single cone is provided with a feed point, and a coaxial feed cable is connected to the feed point in the bottom of the single cone by penetrating the step-shaped floor and the horizontal polarization unit from bottom to top successively. Within the frequency range from 0.8GHz to 2.70GHz, the single-cone ceiling antenna realizes effective impedance match, an ideal omnidirectional radiation performance, a substantial edge coverage enhanced effect, a consistent in-band coverage range, higher efficiency, higher port isolation degree (better than -24dB), small size and low profile and is suitable for indoor coverage. The antenna is also characterized by being novel in ideas, clear in principles, universal in methods, easy to realize, low in cost and suitable for batch production, the antenna can be used to replace a routine dual-polarization omnidirectional ceiling antenna, and can be used for design and improvement of a vertical-polarization enhanced omnidirectional ceiling antenna and a planar Alford loop antenna.

The invention provides a double-frequency high-gain dielectric resonance array antenna. The antenna comprises a substrate, two microstrip feed networks and a dielectric resonant unit array composed of N dielectric resonant units, N >=1, the microstrip feed networks are arranged on the substrate, the N dielectric resonant units are arranged on the substrate in a coaxial or collinear arrangement manner, feed points of the dielectric resonant units are coupled to the output ends of the two microstrip feed networks, first feed slots are arranged in two side surfaces of each dielectric resonant unit, and a second feed slot is arranged in the bottom surface of each dielectric resonant unit. One microstrip feed network is provided with a group of coupling apertures close to the output end of a dielectric cube, the other microstrip feed network is provided with a group of coupling probes close to the output end of a dielectric cube, the coupling probes and the first feed slots form a coupling power, the coupling apertures are formed in the substrate and coupled with the second feed slots. The high-gain dielectric resonance array antenna is compact in structure, low in weight, low in loss, high in efficiency, low in cost, easy to assemble and suitable for batch production and includes fewer welding points, and can be used to provide effective or beneficial references for design and improvement of other broadband, multi-frequency, low-gain dielectric resonant units or array antennas.

The invention discloses a beam up-tilt high-gain omnidirectional antenna, which comprises a first sub-array and a second sub-array which are coaxially arranged, wherein array elements are U-shaped symmetric oscillators. A dielectric substrate is provided with feeding lead wires for connecting the oscillators of the first sub-array and the second sub-array, the first sub-array and the second sub-array are connected with feeding cables by means of the feeding lead wires, the characteristic impedance of the feeding cable connected with the first sub-array is Z01, the characteristic impedance of the feeding cable connected with the second sub-array is Z02, the input impedance of the first sub-array Zin1 equals the characteristic impedance of the feeding cable connected with the same, the inputimpedance of the second sub-array Zin2 equals the characteristic impedance of the feeding cable connected with the same, that is, Z01=Zin1, Z02=Zin2, the first sub-array is an M-element sub-array, the second sub-array is an N-element sub-array, the M and the N are natural numbers greater than or equal to 1, and the M and the N are not equal. The beam up-tilt high-gain omnidirectional antenna disclosed by the invention has the advantages of having ultra wideband, high gain, high power, high efficiency and simple structure, and being horizontally omnidirectional, beam up-tilt, light and portable, and economical and durable.

The invention discloses an omni-directional array antenna, comprising N omni-directional subarray units which are arrayed to form a round array along a circumference. Each omni-directional subarray unit comprises p coaxially arrayed symmetrical dipoles, wherein the N and the p are natural numbers. The invention also discloses a beamforming method of the omni-directional array antenna. The omni-directional subarray units are excitated in an equiamplitude, in-phase or out-phase mode, thereby forming different types of affair beams such as omni-directional-beam, double-beam, three-beam and four-beam. According to the method, various MIMO beamforming capabilities of the omni-directional antenna are realized; the omni-directional array antenna is high in gain, many in formed beam, simple in algorithm, low in array element coupling and low in cost; and the omni-directional array antenna shows huge potential in a future 5G application. The method is characterized by that the thinking is novel, the principle is clean and the method is universal, simple and practicable. The method is also effective and applicable to beamforming design of H, V single-polarized omni-directional antennas or H / V dual polarized omni-directional antenna.

The invention provides a miniaturized high-gain dual-polarized omnidirectional antenna comprising a V-polarized antenna, an H-polarized group array antenna and an H-polarized subarray feeder panel. The V-polarized antenna comprises M half-wave vibrators which are arranged on the V-polarized antenna substrate and V-polarized antenna feeders which are connected with the half-wave vibrators. The H-polarized group array antenna comprises N H-polarized array units which are arranged in parallel to form the array. Each H-polarized array unit comprises a dielectric disc. The circumference of the dielectric disc is provided with X H-polarized vibrators and H-polarized antenna feeders which are connected with the H-polarized vibrators. The V-polarized antenna is arranged at the external side of theH-polarized subarray feeder panel in parallel. The H-polarized array units are arranged to be intersected with the H-polarized subarray feeder panel and the V-polarized antenna. The H-polarized subarray feeder panel performs feeding to the H-polarized array units, wherein M, N and X are natural numbers greater than or equal to 1. The omnidirectional antenna of being high-gain, omnidirectional, dual-polarized, high-isolation, high-power, short and beautiful, simple in structure and economical and durable can be provided for the outdoor WIFI wireless access point.

The invention provides a preparation method of a non-lead copper-based halide scintillator film, which comprises the following steps: preparing copper-based halide crystal AxCuyXz powder, and paving the powder on a first matrix; heating the first matrix to obtain a copper-based halide crystal powder melt; preheating a second matrix, covering the copper-based halide crystal powder melt with the second matrix, and applying pressure to the non-lead copper-based halide crystal powder melt; and after cooling, removing the first matrix and the second matrix to obtain a copper-based halide scintillator film, wherein the first matrix and the second matrix are both high-temperature-resistant matrixes. The hot pressing method is simple to operate, universal and low in cost, and the prepared scintillator film is excellent in performance, free of heavy metal lead, non-toxic and free of environmental pollution.

The invention relates to the technical field of rare earth permanent magnet materials, and discloses a method for regulating the grain size of a coarse grain layer of a neodymium-iron-boron magnet. The method comprises the following steps of: performing acid pickling treatment on rapidly-quenched neodymium-iron-boron magnetic powder by using an acid solution, conducting washing, and performing hotpressing to prepare an isotropic neodymium-iron-boron magnet and an anisotropic neodymium-iron-boron magnet. According to the method, the grain size of an interface coarse grain layer in the neodymium-iron-boron magnet can be effectively reduced by reducing the oxygen content of the surface of the rapidly-quenched neodymium-iron-boron magnetic powder through acid and strictly controlling the pH value of the acid solution and acid pickling time, so narrow particle size distribution is obtained, which has a good effect on improving the residual magnetism and coercive force of the magnet.

The invention provides a dual-frequency and high-gain omnidirectional antenna. The dual-frequency and high-gain omnidirectional antenna comprises at least two dual-frequency half-wave oscillator unitswhich are arranged on a substrate, wherein a high-frequency oscillator unit is arranged between two adjacent dual-frequency oscillator units, and the dual-frequency oscillator unit and the high-frequency oscillator unit are used for feeding by printed parallel dual-conductor feeders. The invention provides an AP station / terminal antenna, which has the characteristics of dual frequency bands, highgain, omnidirectional performance, high efficiency, miniaturization and low cost, for mobile communication, and an effective or beneficial reference method is provided for optimization and design ofthe dual-frequency or multi-frequency omnidirectional antenna in other frequency bands.

A low-gain low-sidelobe micro-base station antenna of the present invention comprises N pairs of crossed vibrators arranged in array and disposed on the floor, each pair of crossed vibrators include two cross-placed pendulous broadband vibrators, and the two pendulous broadband vibrators are respectively printed on two dielectric substrates; a microstrip line is arranged on the other side of the dielectric substrate opposite to the pendulous broadband vibrator; two printed feed networks are arranged on the floor to respectively feed the two subarrays of the array; and the input ends of the feed networks are provided with two-stage cascaded Wilkinson power splitters. The Wilkinson power splitters feed each array element through each power splitting branch, wherein N is a natural number larger than and equal to 2. The invention designs the densely disposed small base station or micro base station antenna of broadband, direction, wide beam, low sidelobe, low gain, low efficiency, miniaturization, low profile and low cost for cellular mobile communication 5.8G band, and provides an effective or beneficial reference method for optimizing the design of low gain and low sidelobe directional antennas in other frequency bands.

The invention relates to the technical field of nano materials.In order to solve the problems of low specific capacity, poor cycling stability and high price of a commercial MnO2 zinc ion battery positive electrode material, the invention provides a flaky manganese dioxide hollow frame structure material and a preparation method and application thereof. The flaky manganese dioxide hollow frame structure material is prepared according to the following methodwhich comprises the steps: growing an MOF material on carbon fiber cloth in situ, then adding a manganese source, and converting the MOF material into the flaky manganese dioxide hollow frame structure material through a hydrothermal method. The method is simple in preparation process, mild in condition, universal, free of special requirements on equipment and capable of achieving large-scale industrial production; the flaky manganese dioxide hollow frame structure material retains an MOF frame structure, is uniform in size, stable in structure and uniform in component distribution, and has excellent zinc ion battery performance.

The invention relates to a directional and dual-frequency omnidirectional combined vehicle antenna. The directional and dual-frequency omnidirectional combined vehicle antenna comprises a dual-frequency omnidirectional antenna assembly, a directional antenna assembly, an antenna feed assembly and the horizontal common floor. The antenna floor is designed into two separate split structures, the twoseparate split structures are connected through capacitive coupling, the lower floor is connected with a vehicle top metal plate, a technical problem of metal vehicle top interference on a low frequency omnidirectional antenna is solved, moreover, UHF and GSM bands are realized through a dual-frequency omnidirectional antenna, and antenna miniaturization and the compact structure are realized. Ashielding problem of the directional antennas on the omnidirectional antenna is further solved, through cleverly arranging the two directional antennas and one UHF / GSM dual-frequency omnidirectional antenna, the omnidirectional antenna is arranged at the middle of the upper floor, the position is relatively high, the directional antennas are arranged at left and right ends of the lower floor, theposition is relatively low, and thereby interference of the later on the previous is reduced.

The invention discloses an ultra wide band horizontal polarized horizontal omnidirectional antenna, comprising at least three arms integrated antenna elements. The arms integrated antenna elements comprises a folded dipole element and a parallel feeder. The folded dipole element comprises two inverted U shaped conductor sheets that are mirror symmetric as the upper arm and the lower arm. The right ends of the two inverted U shaped conductor sheets are connected by bent portion. The left ends of the two inverted U shaped conductor sheets are disconnected and respectively connected with one of two parallel feeders. The at least three arms integrated antenna elements are rotationally distributed around a center point. The parallel feeder converges at the center point. The center point is a feed point. The ultra wide band horizontal polarized horizontal omnidirectional antenna utilizes a folded dipole as a radiation element, in order to obtain the high impedance and fed and broadband after arraying and parallel feed. The ultra wide band horizontal polarized horizontal omnidirectional antenna increases gains significantly, optimizes the maximum radiation direction, puts up and down into the ideal level, obtains better cross polarization ratio and improves efficiency significantly. The ultra wide bandwidth simplifies the design of feed network, and is more convenient to debug and optimize.

The invention discloses a vehicle-mounted all-around dipole antenna. The vehicle-mounted all-around dipole antenna comprises a sleeve, a first conductor section, a first spiral body, a second conductor section, a second spiral body and a third conductor section which are coaxially arranged from the bottom up and are in loaded connection in sequence, wherein the sleeve comprises a first cylindrical section, a conical section and a second cylindrical section which are connected from the bottom up; the conductor sections and spiral sections are connected through L-shaped bent conductor sections; the third conductor section is nested or not nested in a second spiral section; the diameter of the first cylindrical section is greater than that of the second cylindrical section; the diameter of the first cylindrical section is consistent with that of the lower end of the conical section; the diameter of the second cylindrical section is consistent with that of the upper end of the conical section; a coaxial cable which passes through from the bottom up is arranged in the central axis of the sleeve; an outer conductor of the coaxial cable is connected with the top end of the sleeve; and an inner conductor of the coaxial cable extends upwardly to be connected with the bottom of the first conductor section. By adoption of the vehicle-mounted all-around dipole antenna, high matching, high gain and increased bandwidth of the antenna are realized; and in addition, the vehicle-mounted all-around dipole antenna is small in design dimensions, high in structural strength, economical and durable.

The invention discloses a two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material. The thickness is 1-25 nanometers, and a crystal structure is a SAPO-34 molecular sieve, wherein a silicon / aluminium atom ratio is 0.05-0.3. The two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material is characterized in that cheap easy-to-get aluminium phosphate, a silicon source and organic amine are used as reactants, through a chemical method, a layered precursor is exfoliated, and then gaseous phase crystallization is conducted to prepare the two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material. The two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material has a an enormous surface area, the silicon content is adjustable in a certain range, and a method is pervasive; the material has multiple advantages and can be subjected to industrial large-scale production; the method is little in template usage, suitable for industrial large-scale production and low in cost, and basically, no environmental pollution is generated. The invention discloses the preparation method of the two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material.

The present invention provides a low-profile double-frequency ultra-wideband antenna, which comprises at least one double-frequency ultra-wideband vibrator unit. The double-frequency ultra-wideband vibrator unit comprises a pair of ultra-wideband vibrators printed on a dielectric substrate and arranged in an orthogonal manner. The two arms of each ultra-wideband vibrator are of a fat-block shape, and the two arms of each ultra-wideband vibrator are provided with arc grooves at the ends along the edges at two sides. The end of each ultra-wideband vibrator is loaded with a section of arc branch knot along the outer edges of the vibrator arms. The centrally intersecting part is provided with a feeding point connected coaxial cable or a balancing device. According to the invention, through the adoption of a thick highly-dielectric-constant dielectric substrate and the use of the manner of opening grooves on the vibrator surface and the loading of open circuit branch knot at the end, it is possible to provide for a micro base station of mobile communications a low-profile double-frequency ultra-wideband antenna featuring a low profile, a small size, the realization of MIMO, high separation and a high gain. The method is also innovative in idea, clear in principle, suitable for use and easy for implementation. With a low cost, the antenna can be produced in batches, and it can best replace a traditional Small Cell antenna. In addition, for the design and improvement in a traditional wideband intersecting vibrator antenna, the invention can also apply effectively.

An ultra-wideband high-gain dual-polarized full-wave oscillator antenna comprises a dual-polarized full-wave oscillator composed of two orthogonally arranged symmetrical oscillators, a reflector plateand a coaxial cable connected with the dual-polarized full-wave oscillator for feeding, wherein the dual-polarized full-wave oscillator is vertically arranged above the reflector plate; The gain of the dual-polarized full-wave oscillator is 10.12 ~ 10.53 dBi, and the side length of the dual-polarized full-wave oscillator is 0.45 [lambda] C-0.55[lambda] C with a total path length of 0.9[lambda]C-1.1[lambda]C; The two symmetrical vibrators both comprise a pair of diagonally symmetrical and closed-loop hollowed-out vibrator arms, At least one longitudinal groove symmetrical along that directionof the vibrator arm and diagonally to the vibrator arm is arranged on the vibrator arm, and conductor strips are connected on the vibrator arm. The antenna has the advantages of ultra-wide band, highgain, dual polarization, high cross polarization ratio, high efficiency, low profile, low intermodulation, high reliability, simple structure, low cost and easy production.

The invention provides a miniaturized broadband oblique polarization type omni-directional antenna. An oblique polarization type radiation unit comprises single-cone radiation bodies disposed along a central axis, lower parasitic short piles, cage-shaped parasitic bodies and polarization deflectors. The single-cone radiation bodies are connected to realize the coaxial feed. The lower parasitic short piles are arranged at the periphery of the lower parts of the single-cone radiation bodies. The cage-shaped parasitic bodies are arranged above the lower parasitic short piles and at the periphery of the middle parts of the single-cone radiation bodies. The polarization deflectors are arranged at the periphery of the single-cone radiation bodies, the lower parasitic short piles and the cage-shaped parasitic bodies. According to the technical scheme of the invention, the miniaturization and the ultra wideband of the antenna are realized in the above loading manner. The polarization deflectors are used for converting vertically polarized waves into obliquely polarized waves. Therefore, the antenna has the capability of simultaneously receiving vertical polarization signals and horizontal polarization signals. Meanwhile, the technical requirements of vehicle-mounted radio direction finding / monitoring antenna can be met.

The invention relates to the technical field of zinc ion batteries, and provides a preparation method of an iron-zinc vanadate ion battery positive electrode material in order to solve the problem ofpoor cycle stability of commercial V2O5 zinc ion batteries. The method comprises the following steps of: adding a vanadium source, an iron source and a surfactant into a hydrogen peroxide solution, and uniformly mixing to obtain a reaction solution; and carrying out hydrothermal reaction on the reaction solution to obtain the ferric zinc vanadate ion battery positive electrode material. The prepared ferric vanadate material is uniform in size and stable in structure, has excellent zinc ion battery performance and can be used as a zinc ion battery positive electrode material. A prepared zinc ion battery has high rate capability, high specific capacity and excellent cycling stability, the specific capacity of the zinc ion battery reaches 220 mAh g<-1> under the test condition that the current density is 1 Ag<-1>, and the cycle time reaches 300 cycles.

The invention provides a method for quantifying a trace amount of biological sample proteome by utilizing an isotope labeling technology. An accompanying sample is designed for a target sample, the accompanying sample is marked again, protein detection loss is transferred to the accompanying sample, detection of trace amount of biological sample protein is achieved, the technical obstacles existing in proteome analysis of trace amount of biological samples in the prior art are overcome, and practical information capable of being used for identification or quantification is obtained.

A wide-beam high-gain dual-polarization directional antenna comprises a reflecting plate, an H / V cross oscillator array and a dual-frame boundary. The middle part of the reflecting plate is a straightpart, and two sides are bending parts, wherein two pairs of L-shaped curled edges are symmetrically loaded on the edges of the two bent parts. An H / V cross oscillator array is arranged at the centerof the reflecting plate. Two sides of the H / V cross oscillator array are provided with double-frame boundaries partially arranged on the reflecting plate. The composite boundaries of the reflecting plate and the reflecting plate are reasonably designed, so as to match the H / V cross oscillator array. The directional base station antenna is wide in bandwidth, high in gain, ultra-wide in beam, dual in polarization, high in isolation, low in profile, low in cost and easy to produce.

The invention discloses a separation method for enriching, recovering and resolving an alkaline chiral drug (such as amlodipine) from a waste liquid. The method comprises the following three steps: extraction and back extraction enrichment (extraction) of the alkaline chiral drug in the waste liquid, water-phase crystallization recovery (water-phase crystallization) of the alkaline chiral drug ina back extraction phase, and organic-phase crystallization chiral resolution (organic-phase crystallization) of the alkaline chiral drug. Firstly, liquid-liquid extraction or liquid membrane extraction is adopted, and alkaline chiral drugs in waste liquid are extracted through an organic phase containing an acid extraction agent and then reversely extracted and enriched through a reverse extraction phase containing an acid reverse extraction agent. Then, an L-acid resolving agent is added into the reverse extraction phase, alkali is added to adjust the pH, and an alkaline chiral drug-L-acid resolving agent water-phase crystal substance is obtained; and finally, the water-phase crystal substance is dissolved in an organic solvent, a racemic alkaline chiral drug is added, organic-phase crystallization resolution is performed, and finally, resolution is performed to obtain optically pure R-alkaline chiral drug and S-alkaline chiral drug products.

The invention relates to a preparation method of a rare earth permanent magnet, especially comprising following steps: (1), providing magnetic powder, preparing the magnetic powder into a preformed blank; (2), heating the preformed blank under a vacuum or protective atmosphere condition, rolling the preformed blank through at least one roller, causing the preformed blank to deform, thus obtaining the rare earth permanent magnet. The invention also provides the rare earth permanent magnet.

The invention discloses a nanometer hollow structure of multi-metal nitrogen oxide as well as a preparation method and application of the nanometer hollow structure. The nanometer hollow structure material of the multi-metal nitrogen oxide is prepared and obtained by using a template adsorption method, a multi-metal ion solution and subsequent nitrogen treatment. The nanometer hollow structure of an oxide with multiple metal components is nitrogenized and prepared into the nanometer hollow structure of various nitrogen oxide, such as a solid solution nitrogen oxide (Ga1-xZnx)(N1-xOx), a chemometry nitrogen oxide LaTiO2N, and a mixed nitrogen oxide (Ga1-xZnx)(N1-xOx)-InN. The specific surface area of the nanometer hollow structure is larger than or equal to 50m<2>. g<-1>, which is far larger than the specific surface area (smaller than or equal to 5m<2>. g<-1>) of conventional multi-metal nitrogen oxide; the shell layer thickness of the nanometer hollow structure is smaller than or equal to 20 nanometers; the granule size of the nanometer hollow structure is smaller than or equal to 10 nanometers, which is far smaller than the granule size (micron dimension) of conventional multi-metal nitrogen oxide; therefore, the defects that the multi-metal nitrogen oxide is difficult to realize nanocrystallization and the specific surface area is extremely low are overcome; the use efficiency of a catalyst can be greatly improved, the usage amount of the catalyst is reduced, and the catalyst has good application prospects; in addition, the nanometer hollow structure can also be used for the respects of gas catalysis, gas sensitivity, lithium ion batteries and the like.

An ultra-wideband high gain horizontally polarized omni-directional antenna is provided. An Alford loop arm of a full-wave half-wave hybrid oscillator is constructed. The complete Alford loop antennais constructed by Alford loop arm and feeds the central coaxial line of the Alford loop antenna. A pair of half-wave oscillator elements with short ends are added to the inner side of full-wave oscillator of each arm of the circular array and the middle part of the circular array. A pair of open-circuit branches are arranged on the outside of the half-wave oscillator. The array is fed by paralleltwo-conductor transmission lines. The transmission lines are composed of unequal length and width conversion segments. The upper and lower two-conductors of the outermost conversion segment are offsetfrom left to right rather than coincide with each other in the center. An arc notch is made on the outside of the middle of the full-wave vibrator. By optimizing the geometrical parameters of the full-wave oscillator, the half-wave oscillator, the open-circuit branch and the parallel feed line, the invention realizes the ultra-wide bandwidth, the higher gain, the good horizontal omni-directionality, the high efficiency, the high power capacity, the simple feeding design, the smaller diameter and the ultra-low profile of the Alford loop antenna unit.

The invention discloses a two-dimensional ultra-thin Me-SAPO-34 (ME: Fe, Co or Ni) molecular sieve thin-sheet material, which has the thickness of 1-30 nanometers and a crystal structure of SAPO-34 molecular sieve, wherein the silicon / aluminum atomic ratio is 0.15-0.25, and the mass content of metal ion Me is 0.4-5%. The material has the advantages that the two-dimensional ultra-thin Me-SAPO-34 (Me: Fe, Co or Ni) molecular sieve sheet material is prepared by using cheap and easily-available aluminum phosphate, a silicon source and an organic amine template agent as reactants and combining a chemical stripping method and a gas phase crystallization method. The obtained two-dimensional ultra-thin ME-SAPO-34 (M: Fe, Co or Ni) molecular sieve sheet material has a large specific surface, the content of silicon and metal ions can be adjusted within a certain range, and the method is universal. The material has multiple advantages and can be industrially mass produced. The method uses less template agent, is suitable for industrial mass production, and has low cost and little environmental pollution. The invention discloses a preparation method of the material.

The invention provides a three-frequency-band high-gain omnidirectional dipole antenna comprising a three-frequency oscillator array, balanced feeder lines, a first dielectric plate, a second dielectric plate, and a third dielectric plate. The first dielectric plate, the second dielectric plate, and the third dielectric plate are arranged successively from top to bottom. The balanced feeder lines are arranged at the top surface and the bottom surface of the second dielectric plate and are printed along the axis direction of a three-frequency oscillator unit. The balanced feeder lines are parallel dual-line transmission lines. The three-frequency oscillator units in the three-frequency oscillator array are printed at the first dielectric plate and the third dielectric plate; and feeding points among all three-frequency oscillator units are connected by the balanced feeder lines. The three-frequency oscillator units consist of upper arms and lower arms, wherein the upper arms and the lower arms are arranged in a mirror symmetry mode. The upper arms and the lower arms include first branches, second branches, and third branches, wherein the first, second, and third branches are arranged along parallel axes; the second branches and the third branches are arranged at the two sides of the first branches symmetrically and the bottoms are connected into one by horizontal branches; and balanced feeding points are formed at central protrusions of the upper arm and the lower arm. The three-frequency-band high-gain omnidirectional dipole antenna has advantages of high gain, omnidirectivity, high efficiency, small size, and low cost; and an effective or benefical reference is provided for an optimized design of other multi-frequency or broadband high-gain omnidirectional array antennas.