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105 results about "Structural symmetry" patented technology
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Structural symmetry. Our bodies are like the wheels of a car, we need to be “balanced” and “aligned” periodically to ensure that the tires are wearing out evenly. When I treat, I consider the pelvis to be the base of everything, if the pelvis is out of alignment, the whole spine from the low back up to the neck is maligned.
Tunable resonant leaky-mode N/MEMS elements and uses in optical devices
ActiveUS20090067774A1Increase varietyImprove utilizationLaser detailsNanoopticsDielectricUnit operation
Mechanically tunable electromagnetic and photonic devices featuring enhanced spectral tunability with minimal mechanical movement are provided. These nano / micro-electromechanically (N / MEMS) tunable elements, including filters and pixels, rely on leaky-mode resonance effects in subwavelength photonic lattices that constitute periodic wavelengths. Such elements can operate in reflection (bandstop) or transmission (bandpass) modes, and can be arranged in one-dimensional or two-dimensional arrays, or operated as single units, and their spectral regions are controlled by the element design. Input electromagnetic radiation illuminates the element and is then filtered, modulated, analyzed or tuned by the element. Mechanical motion alters the structural symmetry, and therefore, the tuning properties, of the nanostructured subwavelength resonance elements. Further, incorporating metals and dielectrics to generate coexisting plasmonic and leaky-mode resonance effects adds to the versatility of the potential applications.
Owner:UNIV OF CONNECTICUT
Tunable resonant leaky-mode N/MEMS elements and uses in optical devices
ActiveUS8938141B2Increase varietyEnhancing utility significanceLaser detailsNanoopticsDielectricElectricity
Mechanically tunable electromagnetic and photonic devices featuring enhanced spectral tunability with minimal mechanical movement are provided. These nano / micro-electromechanically (N / MEMS) tunable elements, including filters and pixels, rely on leaky-mode resonance effects in subwavelength photonic lattices that constitute periodic wavelengths. Such elements can operate in reflection (bandstop) or transmission (bandpass) modes, and can be arranged in one-dimensional or two-dimensional arrays, or operated as single units, and their spectral regions are controlled by the element design. Input electromagnetic radiation illuminates the element and is then filtered, modulated, analyzed or tuned by the element. Mechanical motion alters the structural symmetry, and therefore, the tuning properties, of the nanostructured subwavelength resonance elements. Further, incorporating metals and dielectrics to generate coexisting plasmonic and leaky-mode resonance effects adds to the versatility of the potential applications.
Owner:UNIV OF CONNECTICUT
Material for organic electroluminescent device and organic electroluminescent device using same
InactiveUS20060051613A1Improve luminous efficiencyImprove heat resistanceElectroluminescent light sourcesSolid-state devicesStructural symmetryHeat resistance
A material for organic electroluminescence device with specific structure having poor symmetry. An organic electroluminescence device comprising a cathode, an anode and an organic thin film layer which is sandwiched between the cathode and the anode and comprises at least one layer, wherein at least one layer in the organic thin film layer contains a material for the organic electroluminescence device described above. An organic electroluminescence device with excellent efficiency of light emission, without pixel defects and which is superior in heat resistance is obtained.
Owner:IDEMITSU KOSAN CO LTD
Single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of same
ActiveCN105799950ALarge folding ratioIncrease stiffnessCosmonautic vehiclesCosmonautic partsStructural symmetrySingle degree of freedom
The invention discloses a single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of the same. The single-degree-of-freedom overconstrained shear-type deployable unit comprises eight disc chucks, four sets of shear fork folding rods and eight sets of folding connecting rods; one set of the folding connecting rods limit the deployable degree of the basic deployable units by depending on the length of the connecting rods, the other seven sets of the folding connecting rods are all overconstrained connecting rods, and the overconstrained connecting rods can effectively improve the rigidity of the basic deployable units. Accordingly, the basic deployable units can be sequentially arranged in order, every two adjacent deployable units can form the first space deployable mechanism and the second space deployable mechanism by sharing four of the disc chucks and one set of the shear fork folding rods, and the length of the first space deployable mechanism and the size of the second space deployable mechanism can be changed by changing the quantity of the basic deployable units. The single-degree-of-freedom overconstrained shear-type deployable unit is simple in structure, has the high structural symmetry and is suitable for constructing an extendable space mast, a solar battery array support and a satellite plane reflecting antenna.
Owner:YANSHAN UNIV
Octahedral nanometer alloy, porous octahedral nanometer alloy as well as preparation method and purpose thereof
InactiveCN106493386AEasy to prepareSimple methodMaterial nanotechnologyTransportation and packagingOctahedronAlloy
The invention relates to octahedral nanometer alloy, porous octahedral nanometer alloy as well as a preparation method and a purpose thereof. The octahedral nanometer alloy is prepared by mixing a metal salt precursor, a surfactant, a reducer and a solvent together and carrying out reaction for a certain time at a proper temperature. A crystal structure of the octahedral nanometer alloy has high symmetry, and a lattice structure of octahedral nanometer particles which form the nanometer alloy is face-centered cubic. The preparation method is simple, is simple and convenient to operate and does not need complex equipment and process; the obtained octahedral nanometer alloy is further dealloyed to obtain the porous octahedral nanometer alloy which also has very high structural symmetry and is large in specific surface area and good in structure stability; as a novel class of high-activity oxygenase mimetic enzyme and peroxidase mimetic enzyme, the octahedral nanometer alloy and the porous octahedral nanometer alloy can be applied to catalysis, immunoassay, biological detection and clinical diagnosis by replacing oxygenase and peroxidase.
Owner:THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
Scissors type hexagonal-prism-shaped extensible unit and space extensible mechanism formed by the same
InactiveCN106058415ALarge shrink rateIncrease stiffnessPhotovoltaic supportsCollapsable antennas meansStructural symmetryEngineering
The invention relates to a scissors type hexagonal-prism-shaped extensible unit and a space extensible mechanism formed by the same. The scissors type hexagonal-prism-shaped extensible unit being a single-freedom-degree over-constrained hexagonal-prism-shaped basic extensible unit comprises twelve floral discs, six groups of scissors type folding rods, and twelve groups of folding connecting rods. One group of folding connecting rods limits the extending degree of the basic extensible unit based on the connecting rod lengths and the rest of eleven groups of folding connecting rods are over-constrained folding connecting rod, so that the rigidity of the basic extensible unit is improved effectively. Multiple basic extensible unit are arranged closely and the adjacent basic extensible units can form a space extensible mechanism by sharing four floral discs, one group of scissors type folding rods and two groups of folding connecting rods; and the size of the pace extensible mechanism can be changed by changing the number of the space extensible units. The provided scissors type hexagonal-prism-shaped extensible unit has high structural symmetry; and different large-dimension space extensible mechanisms can be formed based on assembling of multiple extensible units. Therefore, the scissors type hexagonal-prism-shaped extensible unit and the space extensible mechanism are suitable for constructing a space solar battery array bracket and a satellite planar reflecting antenna.
Owner:YANSHAN UNIV
Mutant polypeptides of fibroblast growth factor 1
ActiveUS7595296B1Good effectFacilitated DiffusionPeptide/protein ingredientsDepsipeptidesWild typeX-ray
The β-trefoil protein human fibroblast growth factor-1 (FGF-1) is made up of a six-stranded anti-parallel β-barrel closed off on one end by three β-hairpins, thus exhibiting a three-fold axis of structural symmetry. The N- and C-termini β-strands hydrogen bond to each other and are postulated from both NMR and X-ray structure data to represent a structurally-weakened region of the β-barrel. Val mutations within the N- and C-termini β-strands are shown to stabilize the structure and to increase van der Waals contacts by filling local cavities present within this region. Mutations that increase van der Waals contacts between both the N- and C-termini β-strands are generally associated with significant reductions in the unfolding kinetics, and also increase the cooperativity of unfolding. Surprisingly, several mutant polypeptides herein disclosed greatly exceed the wild-type polypeptide in ability to stimulate human fibroblasts to proliferate.
Owner:FLORIDA STATE UNIV RES FOUND INC
Large size combined optical fibre perform of polarization maintaining fiber and production method thereof
ActiveCN101391861AEasy to moveEvenly heatedGlass making apparatusGlass fibre productsStructural symmetryPolarization-maintaining optical fiber
The invention relates to a polarization maintaining optical fibre large-size composite optical fibre preform and a preparation technological method, and comprises the optical fibre preform with a fibre core and cladding layers; the areas of the cladding layers of the two sides of the fibre core of the optical fibre perform are provided with two holes which run through lengthways and are parallel to the fibre core; the two holes are provided with stress rods so as to form the composite optical fibre preform; the invention is characterized in that the optical fibre preform has the diameter of 30 to 80mm and the length of 200 to 800mm, the diameter range of the two side holes is 12 to 27mm and the diameter range of the stress area of the stress rod is 10 to 25mm. The polarization maintaining optical fibre large-size composite optical fibre preform and the preparation technological method lead the wire-drawing condition to be stable and controllable, and the drawn polarization maintaining optical fibre has excellent mechanical property and can pass the tension screening of 1 percent, even 2 percent; the preform with large diameter and large length is used for producing the polarization maintaining optical fibre; the wire-drawing length of a single preform reaches to be more than 200km, even more than 100km; and the production efficiency of the optical fibre is high. The drawn optical fibre structure has good symmetry and lengthwise uniformity and is easy to control.
Owner:YANGTZE OPTICAL FIBRE & CABLE CO LTD
Single conversion stage bidirectional soft-switched ac-to-ac power converter
InactiveUS20160094141A1Easy to optimizeLoss-less switching operationEfficient power electronics conversionAc-ac conversionSoft switchingStructural symmetry
A single conversion stage bidirectional soft-switched AC / AC power converter system is capable of converting power in both directions between high- and low-voltage sources. The system has substantially loss-less switching and regulated output in both directions of power transfer. The semiconductor and electro-magnetic components of the system provide both output regulation and soft switching in both the step-up and the step-down directions of power conversion. The commonality of components between the two directions of power transfer reduces total component count, cost and volume, and enhances power conversion efficiency. An associated method of power transfer employs structural symmetry in a resonant circuit of the system to ensure high efficiency line power transfer in both directions.
Owner:GREECON TECH
Piezoelectric speaker and method of manufacturing the same
ActiveUS20110135123A1Increase sound pressureReduce sound distortionPiezoelectric/electrostrictive microphonesImpedence networksStructural symmetryLow frequency band
In a piezoelectric speaker, an acoustic diaphragm is thicker than a piezoelectric thin film and is formed of a more flexible and higher elasticity material than the piezoelectric thin film, thereby greatly improving output sound pressure in a low frequency band and reducing sound distortion. Further, the piezoelectric thin film is attached to the acoustic diaphragm in an inclined structure in which the piezoelectric thin film is horizontally turned from the acoustic diaphragm, thereby preventing a standing wave from being created by structural symmetry and minimizing sound distortion.
Owner:ELECTRONICS & TELECOMM RES INST
Spraying mechanism based on four-degree-of-freedom spraying module
ActiveCN103623971ALight in massReduce exerciseLiquid surface applicatorsCoatingsStructural symmetryEngineering
The invention relates to a spraying mechanism based on a four-degree-of-freedom spraying module and belongs to the field of machine manufacturing. The mechanism comprises a base, a gantry rack, a movable platform and a spraying work module, wherein the gantry rack is fixedly arranged on the base; the movable platform can realize translation on a guide rail along the base; the spraying work module comprises two spraying modules which have the same structure and can independently realize four-degree-of-freedom motions; the two spraying modules are symmetrically mounted on the gantry rack respectively. Each spraying module comprises a plane five-pair mechanism and two retraction mechanisms to form a space hybrid mechanism; a nozzle at the tail end of the mechanism is driven by four servo motors to move to realize two movable degrees of freedom and two rotary degrees of freedom. The motions of the moveable platform and the spraying work module are combined so that the spraying mechanism can realize the spraying work of the three movable degrees of freedom and the two rotary degrees of freedom. The spraying mechanism has structural symmetry, high sensitivity and high rigidity, and is easy to manufacture and convenient to control; the modularization is easy to realize.
Owner:TSINGHUA UNIV
Shears-fork type hexagonal-prism extensible unit and space extensible mechanism formed by the same
InactiveCN106450647ALarge shrink rateIncrease stiffnessPhotovoltaic supportsCollapsable antennas meansStructural symmetryEngineering
The invention relates to a shears-fork type hexagonal-prism extensible unit and a space extensible mechanism formed by the same. The shears-fork type hexagonal-prism extensible unit being a single-freedom-degree over-constrained hexagonal-prism basic extensible unit comprises twelve floral discs, six groups of shears-fork type folding rods, and twelve groups of folding connecting rods. One group of folding connecting rods limits the extending degree of the basic extensible unit based on the connecting rod lengths and the rest eleven groups of folding connecting rods are over-constrained folding connecting rods, so that the rigidity of the basic extensible unit is improved effectively. Multiple basic extensible unit are arranged closely and the adjacent basic extensible units can form a space extensible mechanism by sharing four floral discs, one group of shears-fork type folding rods and two groups of folding connecting rods; and the size of the pace extensible mechanism can be changed by changing the number of the space extensible units. The provided shears-fork type hexagonal-prism extensible unit has high structural symmetry; and different large-dimension space extensible mechanisms can be formed based on assembling of multiple extensible units. Therefore, the shears-fork type hexagonal-prism extensible unit and the space extensible mechanism are suitable for constructing a space solar battery array bracket and a satellite planar reflecting antenna.
Owner:YANSHAN UNIV
Architectural pattern detection and modeling in images
ActiveCN102770864ADigital data information retrievalCharacter and pattern recognitionStructural symmetrySimulation
Systems and methods are provided to facilitate architectural modeling. In one aspect, repetitive patterns are automatically detected and analyzed to generate modeled structural images such as building facades. In another aspect, structural symmetry is analyzed to facilitate architectural modeling and enhanced image generation.
Owner:THE HONG KONG UNIV OF SCI & TECH
Method for processing sparsity of AC (alternating current)/DC (direct current) hybrid grid tide current meter
The invention discloses a steady equivalent model of a voltage source converter and a common control mode and provides a tide current computing model of a multi-terminal flexible direct current and alternating current hybrid grid. In order to solve the problem of non-structural symmetry and zero diagonal element of a tide current Jacobian matrix caused by a voltage source converter model, a small number of zero elements are processed into non-zero elements to restore the structural symmetry of the Jacobian matrix, a controlled quantity serves as a constant and is substituted into an equation, variables are preferentially ordered to solve the problem of zero diagonal element, and the difficult problem in tide current calculation of a VSC (Vacuum System Controller)-containing direct current and alternating current hybrid grid is overcome with an extremely low sparsity cost. The correctness of the mentioned model and the effectiveness of sparse matrix treatment are verified through simulation run.
Owner:STATE GRID CORP OF CHINA +1
Helical tube hot-extrusion die in porous magnesium alloy
InactiveCN101633009AReduce resistanceGuaranteed dimensional accuracyExtrusion diesCircular discStructural symmetry
A helical tube hot-extrusion die in porous magnesium alloy belongs to the technical field of die processing. The helical tube hot-extrusion die comprises an upper die, a middle die and a lower die, wherein, the upper die, the middle die and the lower die are sequentially sheathed and are of disk structures, and rabbets, locating pins and bolts are respectively arranged between the upper die and the middle die as well as between the middle die and the lower die for fixation. A helical flow supply mode is adopted for the upper die of the helical tube hot-extrusion die, which significantly lowers resistance formed by helical shaping of tube blank by special helical equipment when a tubular product is extruded; and a circular welding cavity is adopted for the lower die, which is beneficial for rotary welding of a magnesium alloy material of plastic flow in the welding cavity. Meanwhile, dimensional accuracy of a metal is ensured under the action of a forming cavity working tape when the metal is extruded out of the welding cavity, and the die structure has good symmetry, thus reducing non-uniformity of feed stock flow, and avoiding cracking of tube walls when a helical aperture is formed on the magnesium alloy material. The helical tube hot-extrusion die has the advantages of high preparation and production efficiency, few waste materials, good quality and being more favorable for meeting the requirements of continuous production.
Owner:SHANGHAI JIAO TONG UNIV +1
Method for realizing ultra-narrowband absorption and sensing by utilizing structural symmetry breaking
ActiveCN110133771AEnhance selective absorptionEnhance and regulate intensityOptical elementsGratingStructural symmetry
The invention discloses a method for realizing ultra-narrowband absorption and sensing by utilizing structural symmetry breaking, and belongs to the field of microelectromechanical systems and photoelectric detection. A grating structure of the invention is composed of a metal substrate, a dielectric buffer layer with a low refractive index and a dielectric grating layer with a high refractive index, a nano-groove is introduced into the grating layer, the symmetry of the grating structure is changed by changing the position of the nano-groove, the high locality and significant enhancement of alight field in the nano-groove are achieved by using the symmetry breaking of the grating structure, and then ultra-narrowband selective absorption of incident light waves is realized. In addition, since the electric field energy is highly localized in the nano-groove of the symmetry breaking grating, a small change in the background refractive index will cause significant movement of an absorption peak, the method can be used for achieving a high-sensitivity refractive index sensing function at the same time, and thus has an application value in such fields as light absorption devices, enhanced nano imaging, stealth materials, photoelectric detection, biosensing, and so on.
Owner:JIANGNAN UNIV
(111) silicon based micro mechanical acceleration sensor and its manufacture
InactiveCN1920576AImprove performanceGuaranteed symmetryAcceleration measurementCapacitanceStructural symmetry
Owner:温州尚品科技有限公司
Mutant polypeptides of fibroblast growth factor 1
ActiveUS7696171B1Good effectFacilitated DiffusionPeptide/protein ingredientsPeptide preparation methodsStructural symmetryFibroblast
The β-trefoil protein human fibroblast growth factor-1 (FGF-1) is made up of a six-stranded anti-parallel β-barrel closed off on one end by three β-hairpins, thus exhibiting a three-fold axis of structural symmetry. The N- and C-termini β-strands hydrogen bond to each other and are postulated from both NMR and X-ray structure data to represent a structurally-weakened region of the β-barrel. Val mutations within the N- and C-termini β-strands are shown to stabilize the structure and to increase van der Waals contacts by filling local cavities present within this region. Mutations that increase van der Waals contacts between both the N- and C-termini β-strands are generally associated with significant reductions in the unfolding kinetics, and also increase the cooperativity of unfolding. Surprisingly, several mutant polypeptides herein disclosed greatly exceed the wild-type polypeptide in ability to stimulate human fibroblasts to proliferate.
Owner:FLORIDA STATE UNIV RES FOUND INC
Output-floating input-parallel high-gain Boost converting circuit and switching method thereof
ActiveCN107517003AHigh gainIncrease boost capacityApparatus without intermediate ac conversionCapacitanceStructural symmetry
The invention discloses an output-floating input-parallel high-gain Boost converting circuit and a switching method thereof and belongs to the field of power electronics. The output-floating input-parallel high-gain Boost converting circuit consists of an input portion, a power conversion portion and a load portion, wherein the power conversion portion can be divided into a first module and a second module which are in structural symmetry. A converter comprises a coupling inductor M1 with two windings L11 and L12, a coupling inductor M2 with two windings L21 and L22, two power switching tubes S1 and S2, two clamping diodes DCC1 and DCC2, two clamping capacitors CC1 and CC2, two output diodes DC1 and DC2 and two output capacitors C1 and C2. On the basis of the output-floating input-parallel high-gain Boost converting circuit, the boost characteristic of the coupling inductors is combined with series-connection boost effects of the output capacitors. The output-floating input-parallel high-gain Boost converting circuit and the switching method thereof have the advantages that the problem that a traditional Boost circuit is limited in voltage gain is solved, the converting circuit is easily to be expanded into multiple phases, and input current ripples can be reduced effectively through application of an interleaving switch-on technology to the switching tubes in the two modules.
Owner:镇江市睿驰环保科技有限公司
Camera calibration checkerboard image corner detection method based on symmetry analysis
ActiveCN104036516AImplement automatic detectionGood precisionImage analysisStructural symmetryPoint cluster
The invention discloses a camera calibration checkerboard image corner detection method based on symmetry analysis. The method comprises the steps that firstly, an input road image is preprocessed; then, candidate feature points are extracted from a checkerboard image according to the characteristic that checkerboard corners have the structural symmetry, and image feature points are detected through candidate feature point clusters and ChESS operators; finally, according to the characteristic that the corners of the checkerboard image exist in the image feature points and have the structural symmetry, detection of all the corners of the checkerboard image is achieved by calculating the initial corner first and then calculating the positions of the other corners. According to the method, the symmetry of the checkerboard image is comprehensively considered, and automatic detection of the corners of the checkerboard image is achieved. The method has great significance for automatic camera calibration. Due to the fact that background feature points and the corners of the checkerboard image can be effectively distinguished, the method has high robustness.
Owner:SHANDONG UNIV OF SCI & TECH
Rectilinear translation planar nine-bar mechanism and method for constructing a rectilinear translation motion mechanism
InactiveCN101745915ALow number of rodsImprove structural rigidityProgramme-controlled manipulatorGearingStructural symmetryComputer science
The invention relates to a planar nine-bar mechanism for generating high-accuracy rectilinear translation and a method for constructing a rectilinear translation motion mechanism. The planar nine-bar mechanism for generating high-accuracy rectilinear translation is designed based on the principles of the Roberts mechanism and parallelogram pantograph (pantograph) and the basic structure consists of a Roberts mechanism and two parallelogram four-bar mechanisms. Based on the basic structure, the planar nine-bar mechanism for generating high-accuracy rectilinear translation can be assembled and modified into a plurality of transformations. The planar nine-bar mechanism for generating high-accuracy rectilinear translation has the advantages of few rods, high structural stiffness, compact structure, structural symmetry, etc. The planar nine-bar mechanism for generating high-accuracy rectilinear translation and the method for constructing the rectilinear translation motion mechanism can be widely applied to the occasions where the translation needs to be implemented, can substitute various small-stroke guide rails, simplify maintenance and also can be used as a rectilinear motion decelerator for increasing the driving force.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Novel five-degree-of-freedom hybrid mechanism with reconfigurable adjustment device
InactiveCN108890619ALarge mobile workspaceLarge working spaceProgramme-controlled manipulatorCarrying capacityStructural symmetry
The invention belongs to the technical field of hybrid robot processing, and particularly relates to a novel five-degree-of-freedom hybrid mechanism with a reconfigurable adjustment device. The novelfive-degree-of-freedom hybrid mechanism comprises the reconfigurable adjustment device, five PUS driving movement branch chains of the same structure, an intermediate PRPU driven movement branch chainand a movable platform. The reconfigurable adjustment device comprises five PRR driving movement branch chains of the same structure and an intermediate platform. The reconfigurable property of the novel five-degree-of-freedom hybrid mechanism is achieved mainly through the structural inclination angle of the reconfigurable adjustment device; the tail-end movable platform can achieve three-dimensional movement and two-dimensional rotation mainly by connecting the PUS driving movement branch chains and the intermediate PRPU driven movement branch chain with the intermediate platform and the movable platform,, and the overall hybrid mechanism has a large movement stroke along the Z axis. The hybrid mechanism integrates the advantages of a series-connection mechanism and a parallel-connection mechanism, has the advantages of large working space, high rigidity, good structural symmetry, high motion flexibility, high carrying capacity and the like, and is suitable for machining large-sizedand complex structural assemblies in the fields of aerospace, ships, military industries and the like.
Owner:BEIJING JIAOTONG UNIV
Method for designing non-circular gear planetary system through Fourier function segment transmission ratios
ActiveCN103939531AAvoid blindnessSave the program modulation processToothed gearingsTransplantingEffective equationEngineering
The invention discloses a method for designing a non-circular gear planetary system through Fourier function segment transmission ratios. The method includes the steps that according to the structural symmetry characteristic of a planetary gear system of a rotary type transplanting mechanism, a transmission ratio between non-circular gears is segmented at the 180-degree position, and the relation among the segment transmission ratios of the planetary gear system is constructed; under the condition of meeting the total transmission ratio of the gear system, in order to solve the problem that effective equations for solving the segment transmission ratios are not enough, the Fourier hypothesis of the non-circular gear segment transmission ratios is provided, and other transmission ratios are distributed successfully; through mirror image, weighting, iterating and fitting processing performed on the segment transmission ratios, an ideal transmission ratio is obtained finally, and therefore a non-circular gear pitch curve is obtained. The method is simple in process, small in calculation amount and high in efficiency, and the designed non-circular gear transplanting mechanism is highly targeted.
Owner:ZHEJIANG SCI-TECH UNIV
|+| type graphene metamaterial capable of realizing plasmon induced transparency and application of |+| type graphene metamaterial
InactiveCN109546349ADoes not involve stacking issuesGood repeatabilityAntennasOptical elementsStructural symmetrySlow light
The invention belongs to the field of plasmon induced transparency, and particularly discloses a graphene metamaterial for realizing plasmon induced transparency. The material is composed of a substrate and a graphene layer arranged on the substrate, wherein the graphene layer is composed of |+|type graphene structure units which are periodically arranged on the substrate, and each|+|type graphenestructure unit comprises two vertically-arranged parallel graphene strips and a cross-shaped structure arranged between the parallel graphene strips. The structure is simple, the chromatic dispersionat the transparent window is large, the group speed can be effectively and rapidly slowed down to generate a slow light effect, and the position of the transparent window can be changed by adjustingFermi energy in a terahertz range. In addition, the transparent window can be regulated and controlled by breaking structural symmetry. The graphene metamaterial has a wide application prospect in optical switches, slow light devices, sensors and highly integrated optical paths.
Owner:ZHENGZHOU UNIV
Microwave ion source
InactiveCN103426706AExtend your lifeOvercome structureElectric discharge tubesPlasma techniqueMicrowaveStructural symmetry
The invention discloses a microwave ion source which comprises a waveguide, a discharge chamber, a magnet exciting coil, a vacuum chamber and an extraction system. The waveguide is connected with one end of the discharge chamber through a microwave window, the magnet exciting coil is wound around the discharge chamber, an ion outlet at the other end is communicated with the vacuum chamber, the extraction system is arranged on an ion beam leading-out channel and leads irons out of the discharge chamber to form beam flows, a middle partition plate is arranged in the waveguide and tightly adheres to the microwave window, and cooling water is led into the middle partition plate to perform forced cooling. The microwave ion source is good in symmetry, the plasma concentration evenness in the discharge chamber is good, improvement of the quality of led-out beam flows is facilitated, and the lifetime of a microwave source can be further prolonged.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY
Liquid-crystal display device
ActiveUS20150185564A1Improve afterimage problemNon-linear opticsActive-matrix liquid-crystal displayLiquid-crystal display
Provided is a lateral-electric-field mode active matrix liquid crystal display device in which an afterimage can be improved. The width of one pixel comb electrode 109B of a plurality of pixel comb electrodes 109 is larger than each of the widths of the other pixel comb electrodes 109 and common comb electrodes 110 and is equivalent to the width of a common shield electrode 110B that covers an image signal wiring line 104 via a second insulating film. A display region is divided into two subregions by the wide pixel comb electrode 109B. In each subregion, the number of pixel comb electrodes 109 is equal to that of common comb electrodes 110. In addition, the width of the common shield electrode 110B is equivalent to that of the wide pixel comb electrode 109B, and the concentration of an electric field in the vicinity of each pixel comb electrode is reduced. Since structural symmetry is achieved, an electric potential distribution becomes symmetrical, and the asymmetry of the manners of emitting light between frames is reduced. As a result, the DC offset component of an image signal after flicker adjustment is reduced to improve an afterimage.
Owner:TIANMA MICRO ELECTRONICS CO LTD
Scissors type hexagonal-prism-shaped extensible unit and space extensible mechanism formed by same
ActiveCN107331939ALarge shrink rateIncrease stiffnessPhotovoltaic supportsCollapsable antennas meansLathe faceplateStructural symmetry
Owner:YANSHAN UNIV
Compact type UWB dual-band trap balancing band-pass filter
The invention discloses a compact type UWB dual-band trap balancing band-pass filter, and belongs to the technical field of wireless communications. The compact type UWB dual-band trap balancing band-pass filter comprises a first filter, a second filter and supplement structures. The first filter and the second filter are in structural symmetry and respectively comprise a microstrip line structure formed on the upper layer of a dielectric substrate and a trough line structure formed on the lower layer of the dielectric substrate. In order to restrain common-mode harmonic waves and achieve dual-band trap characteristics, the supplement structures are additionally arranged in the microstrip line structures on the upper layers of the dielectric substrates, each supplement structure comprises a first microstrip branch knot, a second microstrip branch knot, a first harmonic oscillator, a second harmonic oscillator, a third harmonic oscillator and a fourth harmonic oscillator, wherein the first harmonic oscillator and the second harmonic oscillator are arranged on the two sides of the first microstrip branch knot in parallel, and the third harmonic oscillator and the fourth harmonic oscillator are arranged on the two sides of the second microstrip branch knot in parallel. The compact type UWB dual-band trap balancing band-pass filter has a wide different-mode signal passband and has the dual-band trap characteristics, a high common-mode restraining characteristic is achieved in the passband, the structure is compact, circuits are simple, and processing is easy.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Quadrature ring-type piezoelectric accelerometer
InactiveCN101358992AReduce distractionsLittle lateral interferenceAcceleration measurement using interia forcesAcceleration measurement in multiple dimensionsElectricityStructural symmetry
The present invention provides a piezoelectric accelerometer. The sensitive components are arranged axisymmetrically; the piezoelectric accelerometer comprises four flexible arms, a quality block and a base; the flexible arms are folded and shaped like a ring or an arc; any two of the flexible arms are arranged opposite to the other two so as to form an orthogonal annular symmetric structure which connects the quality block and the base; and the flexible arms are made of piezoelectric material or the piezoelectric sheets are symmetrically pasted on the flexible arms. The accelerometer can perform the three-axis measurement, and because of the structural symmetry, when the axial acceleration is measured, the response of the transverse acceleration can be reduced; when the transverse acceleration is measured, the response of the axial acceleration can be reduced; therefore, the interference between the channels is inhibited to the lowest degree. The three-way accelerometer has the characteristics of high sensitivity, small transverse interference and simple manufacturing process, and can be used in the industrial production, the scientific research and the national defense field.
Owner:PEKING UNIV
Micro machining method for bulk silicon for forming cavity structure of MEMS (micro-electromechanical systems) thermopile detector
ActiveCN103145094AStructural symmetryHigh controllability of the manufacturing processDecorative surface effectsChemical vapor deposition coatingThermopileMicroelectromechanical systems
The invention provides a micro machining method for bulk silicon for forming a cavity structure of an MEMS (micro-electromechanical systems) thermopile detector. The method comprises the following steps of: providing a silicon substrate, growing a silica membrane on the silicon substrate in a thermal oxidation manner, and forming a thermopile area and an infrared absorption area on the silica membrane. A thermal nodal area is arranged at one end of the thermopile area, close to the infrared absorption area, and a cold nodal area is arranged at the other end of the thermopile area, far away from the infrared absorption area. A silicon nitride and silica compound membrane structure is deposited on a thermopile structure layer, and a corrosion opening is formed in a compound membrane through photoetching. A release channel of the thermopile structure is formed by the corrosion opening. Through the release channel, a superficial layer on the surface of the bulk silicon is corroded by using an isotropy corrosion method so as to form a thin cavity of the superficial layer of the bulk silicon, and a bulk silicon deep layer below the thin cavity is corroded by using an anisotropy corrosion method so as to form a regular smooth ladder-shaped cavity structure, and therefore, the cavity structure in the bulk silicon is finally formed. The cavity structure formed by using the method has a regular and smooth inner surface and is good in structure symmetry.
Owner:中科芯未来微电子科技成都有限公司
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