67 results about "Artificial structure" patented technology

A method for treating or preventing retinal pathology or injury. The method locates and secures a retinal stimulating substance in the eye between the internal limiting membrane and the retina, which is the target site for the substance. The substance may be an implant that provides electrical stimulation to adjacent ganglion and neurofiber cells. Alternatively, the substance may be a pharmaceutical substance to stimulate the retina. In addition to providing direct contact of the substance with its target, the method obviates the need for artificial structures such as tacks or adhesives which may cause retinal bleeding or traction.

The invention provides an artificial electromagnetic structure material-based high-gain low-radar cross section planar antenna which comprises a micro-strip paster and a periodic artificial structural material with different echoing characteristics at the front side and the back side. The artificial structural material comprises a dielectric substrate, a periodic metal square ring structure manufactured on the front side of the substrate and a periodic opening gap metal plane structure manufactured on the back side of the substrate. Lumped resistance elements are loaded on the centers of four edges of the metal square ring structure on the front side. When electromagnetic waves enter from the front side of the artificial structure material, the energy of the electromagnetic waves is mainly absorbed; when the electromagnetic waves enter from the back side of the artificial structure material, the energy of the electromagnetic waves is mainly reflected. The artificial structure material is placed above the micro-strip paster to be used as a coating, the back side of the artificial structure material is used as partial reflection surfaces to form an F-P (Fabry-Perot) resonant cavity with a metal grounding plate of the micro-strip paster, and thus the radiation gain of the antenna is increased; and the incident waves can be absorbed from the front side, and thus the radar cross section of the antenna is reduced.

The invention relates to an electric control radiation directional diagram reconfigurable antenna. The reconfiguration of the directional diagram of the antenna is finished by the following steps of: (1) selecting the working frequency f of an antenna; (2) confirming an arrangement cycle of an artificial structure material unit in three directions, an antenna integral structure and a metal structure and the substrate material of a formed unit, wherein the arrangement cycle comprises geometric parameters of the substrate material and the metal structure; (3) adding a variode on an opening of the metal structure; (4) calculating the transmission spectrum S21 phase of the unit by utilizing electromagnetic simulation software, continuously changing a capacitance value of the variode, recording the corresponding phase of a scattering parameter and drawing a phase-capacitance C curve; (5) arranging an artificial material along the horizontal plane cycle, dividing the artificial structure material into N areas with equal distance, and controlling a voltage value loaded on the variode in the unused area, wherein all the areas have equal structural size and contain equal amount of units. The antenna is a controllable antenna of a broadband and can realize positive/negative 40-degree deflection or so of a main lobe of the radiation directional diagram of the antenna.

The invention provides a high-gain and high-power antenna based on materials with low refractive index. The method for designing the antenna comprises the following steps: (1) determining the working frequency f of the antenna; (2) selecting the corresponding waveguide, waveguide-coaxial transformer, transformer connector and impedance tuner according to the working frequency f thereof, so as to change the mode of the electromagnetic wave and match the impedance; (3) selecting a proper aperture A according to the geometric dimension limit and the directivity D of the antenna; (4) determining the geometric dimensions of the sub-wavelength artificial-structure material with low refractive index, wherein the material has the structure of a double-layer metal copper mesh, no dielectric medium is added between the two layers of the copper mesh, and the geometric parameters of the structure are mainly the period a of the copper mesh, the side length b of a hollow cavity, the thickness t of the copper mesh, and the distance Dis_layer between the two layers of the copper mesh; and (5) selecting the proper distance Distance between the material and the ground metal plate through simulation, and acquiring the maximum directivity and minimum standing-wave ratio (SWR) by adjusting the impedance tuner according to the tests. The invention can simultaneously guarantee the high gain of the antenna and increase the power of the antenna, and reduces the SWR of the antenna.

An artificial attaching method of algae spores on an artificial structure and an underwater natural rock is provided to induce the stable growth of algae. An artificial attaching method of algae spores on an artificial structure and an underwater natural rock comprises the following steps: removing surface attachment matters from the surface of the artificial structure(B) and the underwater natural rock(A); installing a diffusion barrier net(110) on the artificial structure and the underwater natural rock; injecting a spore solution through an inlet(111) formed on one side of the diffusion barrier net; and sealing the inlet for 1hour, and collecting the diffusion barrier net.

The invention discloses an artificial structure-based multi-frequency circular polarizer, which comprises n-1 (n is an integer of greater than or equal to 3.) layers of rectangular dielectric substrates and periodic circular arc metal wire structures, wherein the periodic circular arc metal wire structures are manufactured on the n-1 layers of rectangular dielectric substrates in the transverse direction and the longitudinal direction; each periodic circular arc metal wire structure comprises t (t=n) circular arc metal wires; t circular arc metal wires are arranged on the first, the second,... ..., the nth faces of the n-1 layers of rectangular dielectric substrates respectively; seen from the direction perpendicular to the plane where the rectangular dielectric substrates are positioned, t circular arc metal wires form t equal parts of a concentric circle; the width of the t circular arc metal wires and the corresponding central angle theta are the same; and the central angle corresponding to a gap between every two circular arc metal wires is also the same. When linear polarization wave with an electric field polarization direction parallel to the longitudinal boundary of the circular polarizer enters in the direction perpendicular to the plane where the rectangular dielectric substrates are positioned, the circular polarizer can convert the incident linear polarization wave into circular polarization transmitted wave with different rotation directions at k (k=t) different frequency points.

A soil screw traction self-traveling type tunnel piercing device and a piercing method belong to the field of trenchless underground tunnel or pipe construction. The soil screw traction self-traveling type tunnel piercing device comprises more than one barrel, and the barrels are connected mutually. More than one screw structure is fixed on the first barrel along the axis of the barrel, the screw structures rotate around self axial centers, and free ends for excavating extend into soil in front of the piercing device. The screw structures are connected with a power driving source. In a piercing process, movement of the screw structures is controlled so as to realize piercing and turning. By the aid of the device and the method, thrust to the front of a total working face is comprehensively and integrally increased, and the advanced piercing technology which relies on a rear artificial structure but does not relies on the prior art is formed.

The invention relates to a vibrate oil moisture sensor, wherein two electrodes are positioned inside the resistance block which is formed by the padding material of the argil; the padding material mixes the sandy loam soil which mainly comprises Sio2 and the gesso at the ratio 3:1.8-2.2, and adds artificial structure amendment. The padding material of the optimal plan adds macromole fixative; the sandy loam soil has PVC pipe; the temperature sensor is fixed inside the pipe to adjust the convening change aroused by changing the temperature. The artificial structure amendment adopts polyacrylamide with 0.1 solid weights; the macromole adopts 1 gram/liter polyacrylamide solution. It also provides a method for preparing the new type vibrate oil moisture sensor.

A reinforcing element for geo-technical applications may include a monolithic net structure made of a plastic material, having a plurality of first elements distanced from one another and having an elongate conformation in a respective prevalent development direction, a plurality of second elements distanced from one another and also having an elongate conformation, which develop substantially in a transversal direction to the first elements. The second elements are stretched along a development thereof, and the second elements are configured such that the net structure exhibits a substantially arched profile and forms a longitudinal seating having an axis of extension substantially parallel to the first elements. A process of manufacturing the reinforcing element and an artificial or partially artificial structure obtained by consolidating the terrain using the reinforcing element are also described.

A nerve regulation device and method is used for stimulating target nerve nuclei. Ultrasonic waves are generated and emitted through an ultrasonic generation module and transmitted by a first transmission module, and a directional wave guide module adjusts parameter information of the ultrasonic waves according to positions and areas of the target nerve nuclei to change transmission direction of the ultrasonic waves and performs directional transmission; the directional wave guide module comprises multiple artificial structures which can be replaced in use, and each artificial structure corresponds to one target nerve nuclei. A second transmission module transmits the ultrasonic waves in directional transmission to enable ultrasonic focal spots focused by the ultrasonic waves to be projected onto the target nerve nuclei. The artificial structure is selected to work correspondingly according to the position and the area of the target nerve nuclei to be stimulated, and the ultrasonic focal spots are projected onto the target nerve nuclei after the parameter information of the ultrasonic waves is adjusted through the artificial structure to realize intervention and treatment of brainfunctional diseases.

The invention provides a reflector of a reflective array antenna which comprises a function board and is used for beam modulating of incidence electromagnetic wave. The function board comprises two or more function board units with a phase shift function. The function board unit comprises a base board unit, at least one artificial structure unit and a reflecting layer, wherein the at least one artificial structure unit is arranged on one side of the base board unit and generates electromagnetic response to the incidence electromagnetic wave, the reflecting layer is used for reflecting electromagnetic wave and is arranged on one side, opposites to the artificial structure unit, of the function board. Distance between two geometric centers of the two adjacent function boards is less than one seventh of wavelength of the incidence electromagnetic wave. According to the reflective array antenna, the technical bias generally believed by technical personnel that demand can not be met after the size of the phase shift unit is decreased to one sixth of the wavelength is overcome.

A structure for attracting fish in lakes and ponds is presented that includes a central mast with one or more angled shafts for the fish to rest upon and congregate near.

The invention discloses an antenna housing for reducing minor lobe level by using an artificial structure material. 2ni columns and mj rows of annular slot unit structures are printed on a single-face copper-clad microwave dielectric plate in the transverse direction and the longitudinal direction respectively, wherein the transversely arranged annular slot unit structures have similar structure appearances and different sizes and are symmetrically distributed along the transverse central axis of the antenna housing; the longitudinally arranged annular slot unit structures are completely the same; and chip resistors are transversely, symmetrically and additionally arranged in each annular slot structure. By rationally selecting the resistance size of the resistors and designing the size of unit structures of the artificial structure material, electromagnetic wave has different transmittance rates and the same transmission phase through each columns of structures, so that the aim of reducing the minor lobe level of the antenna is fulfilled; and the structure has the advantages of simple design, light weight and low cost.

The present invention discloses a right-handed circular-polarization conversion metamaterial film, and is of an optical frequency band metamaterial structure, comprising a first metal microstructure layer, a dielectric substrate layer and a second metal microstructure layer, wherein the first and the second metal microstructure layers are located on two sides of the dielectric substrate layer; an upper surface of the first metal microstructure layer is an incident surface, the lower surface of the second metal microstructure layer is an exit surface; the first and the second metal microstructure layers are of chirally-symmetric left-handed windmill structures or spiral chirally-symmetric left-handed artificial structures, a right-hand-rotated angle using the structure center as a rotation center is formed between the first and the second metal microstructure layers, the amplitudes of two orthogonal components of output light waves are equal, and a phase difference of the two orthogonal components is odd times of 90 degrees.

The invention discloses a building image segmentation method for augmented reality application. The method comprises the steps that building image features which comprise a gradient angle entropy feature, a color entropy feature and a line feature are designed; training samples are selected, and improved K-means is used to cluster training samples to select samples in disjoint cluster sets as training samples; Adaboost decision classifier training is carried out, and selected samples are input to train an Adaboost decision classifier; and a test image is input into the Adaboost decision classifier, and a building segmentation result is output. Compared with a traditional segmentation method, the method provided by the invention has the advantages that a building image feature description method is designed, and the gradient angle entropy is simplified, so that the segmentation efficiency is significantly improved; the classifier based on an Adaboost decision tree is designed to removethe sample redundancy; and a sample selection method is designed, and the final classifier model is trained to quickly and accurately segment building, non-building and non-artificial structures containing building images.

The invention discloses an antenna housing for implementing antenna beamwidth switching by using an artificial structure material. The antenna housing consists of two layers of microwave dielectric slabs which are printed with similar H-shaped metal wire structures; the upper-layer microwave dielectric slab is printed with 2n columns and m rows of H-shaped metal wire structures in the horizontal and longitudinal directions, and a microwave diode is arranged in each H-shaped metal wire structure; and the lower-layer microwave dielectric slab is printed with 2n columns and m rows of H-shaped metal wire structures in the horizontal and longitudinal directions, and a microwave diode and a chip resistor are arranged in each H-shaped metal wire structure. The upper-layer and lower-layer microwave dielectric slabs form the integral antenna housing, direct-current voltage is externally applied to the first row of metal wire in each H-shaped metal wire structure in the two layers of microwave dielectric slabs, diodes in each row of units have the same direct-current bias, the units in each row are connected in parallel, and by changing the externally applied direct-current voltage value, electromagnetic waves have high penetration or high absorption property. The antenna housing is loaded above an antenna, the externally applied direct-current voltage distribution is reasonably designed, and the width switching of antenna radiation beams can be realized; and the antenna housing is easy to manufacture and low in cost.

The invention discloses a method for inhibiting development of a water guide fracture zone of a pre-mining grouting construction structure key layer. The method comprises the following steps that 1, an occurrence position of an overlying strata primary structure key layer is determined; 2, the development range of the water guide fracture zone is determined; 3, a construction horizon of an artificial structure key layer is analyzed and determined, and the thickness and the position of the structure key layer with the highest water guide fracture zone sweeping position are determined accordingto the overlying strata structure key layer analyzed in the step 1 and the water guide fracture zone development height calculated in the step 2; 4, the vertical thickness and the horizontal width inthe artificial structure key layer are determined; and 5, construction grouting parameters of the artificial structure key layer is determined. Therefore, an original structure key layer is thickenedand reinforced by utilizing ground horizontal directional drilling grouting construction structure key layer before coal seam stoping, the thickness and hardness characteristics of the structure key layer are improved, and vertical development of mining fractures is inhibited, so that the purpose of water-preserved coal mining is achieved.

The invention belongs to the technical field of electromagnetic functional devices and specifically relates to a frequency point-adjustable THz wave modulator based on a transistor with high electronic mobility. The modulator comprises a sapphire substrate layer, a GaN buffer layer, and an AlGaN battier layer which are stacked successively from bottom to top, as well as an Ohm metal layer and a Schottky metal layer disposed on the AlGaN battier layer, wherein the Ohm metal layer and the Schottky metal layer are covered by an isolation medium layer; a meta-material layer is disposed on the upper surface of the isolation medium layer; the meta-material layer is composed of multiple metal artificial structure units which are arranged cyclically; the metal artificial structure units form an upper I shape and a lower I shape and are distributed in axial symmetry along the Ohm metal layer; and the long edge of one I shape is connected to source and drain electrodes, and the long edge of the other I shape is taken as a frequency point tuning edge of the THz wave modulator. According to the invention, modulation frequency points of the THz wave modulator are adjustable in a specific frequency band, so that the modulator is applicable to applications such as THz wireless communication systems with different frequency points.