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42 results about "Dispersion point" patented technology
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In topology, a dispersion point or explosion point is a point in a topological space the removal of which leaves the space highly disconnected. More specifically, if X is a connected topological space containing the point p and at least two other points, p is a dispersion point for X if and only if is totally disconnected (every subspace is disconnected, or, equivalently, every connected component is a single point). If X is connected and is totally separated (for each two points x and y there exists a clopen set containing x and not containing y) then p is an explosion point. A space can have at most one dispersion point or explosion point. Every totally separated space is totally disconnected, so every explosion point is a dispersion point.
Space-time regulation and emergency guidance system and method for scenic spot tourists
ActiveCN104036352ARealize reasonable regulationGuarantee the quality of the tourClosed circuit television systemsResourcesGuidance systemDecision scheme
The invention provides a space-time regulation and emergency guidance system and method for scenic spot tourists. The space-time regulation and emergency guidance system for scenic spot tourists comprises a hardware basis platform and an application software system, wherein the hardware basis platform comprises a tourist flow volume collector, a video monitor, a multimedia service terminal, a TRE server and a control management platform; the application software platform comprises a tourist flow analysis module, a video analysis module, a space-time regulation module, a TRE database, a scenic spot tour guidance module, a flow distribution and emergency guidance module, a flow distribution and emergency monitoring module and a TRE management module, and the tourist flow analysis module is used for judging the saturation condition of the tourist flow volume of a scenic spot and judging whether abnormal phenomena exist in the scenic spot by analyzing the bidirectional tourist flow volume, which is collected by the tourist flow volume collector, of a dispersion point in the scenic spot and the tourist flow real-time state, which is collected by the video monitor, of a scenic spot core area and a dispersion thoroughfare; according to a judgment result, the flow distribution scheme and the emergency decision scheme of each scenic spot are matched according to the relevant setting of the TRE database; information is transferred to tourists by the multimedia service terminal to guide the tourists to choose a touring route; and the situation of excess tourists in certain space time is alleviated.
Owner:SHAANXI NORMAL UNIV
High-power high-efficiency supercontinuum source
InactiveCN103022867AIncrease output powerLow costCladded optical fibreActive medium shape and constructionManufacturing technologyPicosecond
The invention provides a high-power high-efficiency supercontinuum source. By reasonably designing characteristics of photonic crystal fibers, long-pulse pump laser (picosecond, nanosecond laser) acts on a normal dispersion area for the photonic crystal fibers, the central wavelengths of stimulated front stages of Raman-Stokes peaks are positioned in an abnormal dispersion area close to a zero dispersion point of the photonic crystal fibers, and the stimulated Raman-Stokes laser peaks serve as a new pump source for stimulating supercontinuum and meet the requirement of an abnormal dispersion pump mechanism. The supercontinuum source simultaneously has the advantages of a normal dispersion pump mechanism and the abnormal dispersion pump mechanism, and high average output power and continuum output with high optical conversion efficiency and a wider supercontinuum range can be realized. By the aid of mature high-power fiber laser technology, photonic crystal fiber manufacturing technology and photonic crystal fiber post-treatment technology, system cost is reduced, and industrial production and application are facilitated.
Owner:NAT UNIV OF DEFENSE TECH
Three-dimensional dispersion point cloud topological neighbor data query method
InactiveCN101404061AEasy accessAccurate acquisitionCharacter and pattern recognitionPoint cloudNear neighbor
The invention provides a three-dimensional scattered point cloud topological near neighbor data query method which is characterized in that: three-dimensional scattered point cloud data is collected, a dynamic hollow ball expansion algorithm is adopted to query a k-near neighbor point set based on a dynamic spatial index structure of R<*>-tree tissue three-dimensional scattered point clouds, sample point topological near neighbor reference data is obtained by the eccentric expansion and the self-adaptive expansion, a Voronoi diagram of the sample point topological near neighbor reference data is generated, data points which are corresponding to a sample point Voronoi neighborhood are queried, and the data points are the topological near neighbor data of the sample points. The use of the method can rapidly and accurately obtain the topological near neighbor data of any complicated mass scattered point clouds.
Owner:SHANDONG UNIV OF TECH
System for Reducing the Condensing Temperature of a Refrigeration or Air Conditioning System by Utilizing Harvested Rainwater
InactiveUS20140231042A1Minimize impactAir heatersFree-cooling systemsCondensation temperatureEngineering
An evaporative air conditioning heat transfer apparatus comprising a collection surface for diverting liquid into a channel, a reservoir capable of receiving and storing the diverted liquid, at least one conduit for transferring liquid from the reservoir to a liquid dispersion point, and a regulator positioned between the reservoir and the liquid dispersion point and configured to control the amount of liquid released at the liquid dispersion point, wherein the liquid dispersion point is configured to distribute the liquid over a condensing coil.
Owner:CURRY THOMAS R +1
Point vector double-enveloping method for determining machined spiral curved surface profile with expanding tool
InactiveCN105785914AImprove robustnessImprove control accuracyNumerical controlEngineeringEqualization
The invention belongs to the field of manufacturing a spiral curved surface, and relates to a point vector double-enveloping method for determining a machined spiral curved surface profile with an expanding tool.The method includes the steps that point dispersion is conducted on a profile bus of the expanding tool according to an equalization criterion, and normal vectors on dispersion points are added to form point vectors; a spiral motion trail of the point vectors along the curved surface of the tool and a straight line along the axis of the tool are expanded into a motion trail to conduct dispersion, the double-enveloping method of the planar point vectors is set up, the points, with the smallest directed distance from a gear, in a two-dimension point vector group is determined as enveloping points, and finally all the enveloping points are constructed into the machined spiral curved surface profile in a fitting mode.
Owner:CHONGQING UNIV
Material special for blowing packaging film and preparation method for material
InactiveCN102807698ALow costSimple manufacturing processFlexible coversWrappersTougheningExtrusion Granulation
The invention relates to the field of processing of macromolecular compounds, in particular to a film blowing material and a preparation method thereof. The material special for blowing a packaging film comprises a composite blowing material, wherein the composite blowing material comprises carrier resin, inorganic powder, a toughening agent, a dispersing agent, a lubricating agent, a coupling agent and a stabilizer. The preparation method for the material special for blowing the packaging film comprises the following steps of: 1) mixing the composite blowing material; and 2) performing extrusion granulation on the mixture. Through the technical scheme, the composite blowing material has the obvious advantages that cost is low, dispersion points do not exist on the surface of a film-coated product, and the like.
Owner:上海心尔新材料科技股份有限公司
Elliptical vibration trajectory control method based on microtexture model
ActiveCN106200551AEnsure controllabilitySolve build problemsNumerical controlMicro nanoNumerical control
The invention discloses an elliptical vibration trajectory control method based on a microtexture model, and belongs to the numerical control machining field. The method comprises the steps that a microtexture surface equation is constructed according to microtexture design parameters, and microtexture machining parameters, cutter parameters and a cylinder datum plane radius are determined; the microtexture model is dispersed in the axial direction and the circumferential direction of the cylinder surface on the basis of the microtexture machining parameters and the resonant frequency of an elliptical vibration device, and position vectors of all dispersion points are obtained; the vibration amplitude of an elliptical vibration cutting trajectory at each dispersion point is determined according to the position vector of the dispersion point, and elliptical vibration cutting trajectories of all the dispersion points are obtained; the elliptical vibration cutting trajectories of all the dispersion points are corrected according to an elliptical vibration cutting trajectory error and used for microtexture cutting machining. The elliptical vibration trajectories are effectively controlled according to the elliptical vibration cutting surface topography forming mechanism through the control method, then controllability of micro-nano texture generation is guaranteed, and the generation problem of random-shaped microtextures is solved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Low-gloss low-odor ABS resin composition for automobile interior and preparation method thereof
The invention discloses a low-gloss low-odor ABS resin composition for automobile interior and a preparation method thereof. The resin composition comprises, by weight, 62-97.9% of ABS resin obtainedby a bulk polymerization method, 0-30% of a heat resistant agent, 1-5% of a matting agent, 0.1-1.5% of a low odor additive and 1-1.5% of a processing aid. The preparation method can effectively reducethe gloss of the material by using the ABS resin with larger particle sizes and a polymer having a high crosslinked structure. The hydrated salt substance can effectively remove low molecular substances through the double vacuum process due to the presence of bound water. The dehydrated salt material can form separated dispersion points in the polymer, and each dispersion point forms a separatedprotrusion so that the gloss of the material can be further reduced. Pigment carbon black has a strong polar group on its surface and can react with polar molecules (odor sources) released from the resin under heat action so that the material odor is reduced.
Owner:SHANGHAI KINGFA SCI & TECH +1
Active intruder mitigation system and method
ActiveUS20180040214A1Facilitating safe outcomeMaximize protectionAlarms with smoke/gas/colored-powderSignalling system detailsDigital imagingLocking mechanism
Owner:INTRUSION TECH INC
Air electrode material powder for solid oxide fuel cell and its production process
ActiveUS20150162621A1Highly uniform compositionHigh compositionCell electrodesElectrolytesLanthanumCobalt
To provide an air electrode material powder for a solid oxide fuel cell, comprising a novel LSCF powder having a highly uniform composition suitable as an air electrode material for a solid oxide fuel cell, and its production process.A composite oxide having a perovskite structure and containing lanthanum, strontium, cobalt, iron and oxide, wherein the dispersion point determined by the peak intensity [La] of the Lα1 characteristic X-ray of lanthanum and the peak intensity [Sr] of the Lα1 characteristic X-ray of strontium as obtained by EPMA measurement, is present within a range of the formula (1) and the dispersion point determined by the peak intensity [Co] of the Kα1 characteristic X-ray of cobalt and the peak intensity [Fe] of the Kα1 characteristic X-ray of iron is present within a range of the formula (2):a[La]−150≦[Sr]≦a[La]+150 (1)b[Co]−300≦[Fe]≦b[Co]+300 (2)wherein 0.2≦a≦1.0 and 0.1≦b≦4.0.
Owner:AGC SEIMI CHEM CO LTD
Pruning clipper for dispensing a chemical treatment
A pruning clipper includes a pair of handles each having a distal end and a proximal end, with the handles being pivotally connected to each other close to the proximal ends of the handles. A first blade is connected to the proximal end of one of said handles, and a second blade is connected to the proximal end of the other handle. A chemical storage tank is connected to the distal end of one of said handles for storing a chemical to be selectively applied to vegetation. A bulb is connected to the proximal end of one of the handles, with the bulb being connected to the tank using a first connecting tube. A dispensing member extends along the side of one of the blades and beyond the blade to a dispersion point, and the dispensing member is connected to the bulb using a second connecting tube. As a result, the user will be able to cut the vegetation as desired using the clippers, and selectively dispense an herbicide as desired by the user.
Owner:BRIM III J CROSWELL
Method for detecting polymethoxylated flavonoi ingredients
ActiveCN106338426AEasy to detectPreparing sample for investigationRaman scatteringOrganic solventAdditive ingredient
The invention discloses a method for detecting polymethoxylated flavonoi ingredients. The method comprises the following steps that an organic solvent and water are adopted for extracting a sample to be detected, and an organic solvent phase is collected; the concentrated organic solvent phase is subjected to two-dimensional thin layer chromatography separation, and dispersion points corresponding to the polymethoxylated flavonoi ingredients are labeled; sol is sprayed to the dispersion points adopted for two-dimensional thin layer chromatography on a normal phase thin layer chromatography plate for surface enhanced Raman scattering spectrum detection, and the spectral intensity of the ingredients corresponding to the dispersion points is obtained; the concentration of the polymethoxylated flavonoi ingredients in the sample is obtained according to the spectral intensity and the linear relation between the concentrations of all ingredients and the Raman scattering spectral intensity. The PMFs ingredients and content in the complex sample can be detected conveniently and fast through a liquid-liquid extraction-thin layer chromatography-surface enhanced Raman scattering combining method, and the method has potential application value on fast detection of PMFs in citrus food and other various samples.
Owner:INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
Microwave frequency conversion power division circuit
InactiveCN105119573AReduce work distribution pointsOptimize layoutMulti-frequency-changing modulation transferenceIntermediate frequencyFull band
The invention discloses a microwave frequency conversion power division circuit, comprising a first intermediate frequency amplification circuit, a second intermediate frequency amplification circuit and a switching circuit. The first intermediate frequency amplification circuit is used for amplifying an intermediate frequency signal formed by processing a first polar signal in a first mixer circuit; the second intermediate frequency amplification circuit is used for amplifying an intermediate frequency signal formed by processing a second polar signal in a second mixer circuit; the switching circuit is respectively connected with the first intermediate frequency amplification circuit and the second intermediate frequency amplification circuit, and is used for switching to output the signals of needed frequency bands; the first intermediate frequency amplification circuit and the second intermediate frequency amplification circuit are designed symmetrically. According to the invention, full band receiving of Ku wave band is realized, the first intermediate frequency amplification circuit and the second intermediate frequency amplification circuit are designed symmetrically, dispersion points of power division of the circuit are reduced, length inconsistency of output signal lines of the circuit is avoided, power division line loss is reduced, matching and unification of power amplification elements is realized, moreover, the circuit is formed through simple layout and clear thinking, is convenient to analyze and has high reliability.
Owner:CHINA COMM TECHHUBEI CO LTD
Movable oil field oily sludge biological tempering separation treatment device
ActiveCN106396320ATo achieve the treatment effectEasy to transportSludge treatment by de-watering/drying/thickeningSludge processingTreatment effectOil field
Provided is a movable oil field oily sludge biological tempering separation treatment device. The device comprises a pretreatment screening process section, a primary oil-mud treatment process section, a secondary oil-water-mud separation process section, a biological sludge treatment process section, an oil-water separation process section, a sand treatment process section and other sludge treatment systems. Each process section of the device is independently prized and modularized, transportation is convenient through prizing, and aiming at the characteristics that remote oil fields, factories and mines and other blocks are scattered and are poor in ground environment condition, the movable oily sludge treatment device has the design rule of being simple, applicable, safe and reliable and meeting production. The device achieves equipment concentration and overall prizing, can be transported to all oil-mud dispersion points, and meanwhile can achieve the treatment effect of a fixed sludge treatment station, and convenience is brought to enterprises with small oil-mud output and remote locations.
Owner:大庆市海油庆石油科技有限公司
Method for distinguishing geometrical characteristic changes generated before and after integral panel part engineering is changed
InactiveCN105069267AShorten the production cycleImprove manufacturing precisionSpecial data processing applicationsMarking outEngineering
The invention provides a method for distinguishing geometrical characteristic changes generated before and after integral panel part engineering is changed. The method is characterized in that when the geometrical characteristic changes generated before and after integral panel part engineering is changed are distinguished, firstly, models generated before and after design is changed are placed at the same coordinate position in space, the appearance face of the model generated after the change is dispersed, thickness values, at all dispersion points, of the models generated before and after the change are calculated independently, the thickness-direction size deflection value, at the same dispersion points, of the models generated before and after the change is judged, the dispersion points with the deflection exceeding the distinguishing accuracy are marked, and changed characteristics can be judged through the positions where the dispersion points with the deflection exceeding the distinguishing accuracy are located. By means of the method, the current situation that changed parts are distinguished only by manually observing the models can be effectively changed, the part production cycle can be shortened, and the manufacturing accuracy can be improved.
Owner:JIANGXI HONGDU AVIATION IND GRP
Optical module adjusting method, electronic equipment, device, system and storage medium
PendingCN113824493ASolve the technical problem of zero dispersion point distribution sensitivityAchieve the technical effect of adaptive adjustmentCoupling light guidesDistortion/dispersion eliminationOptical ModuleEngineering
The embodiment of the invention provides an optical module adjusting method. The method comprises the following steps: collecting first incident light power of a first optical module, a signal-to-noise ratio of a first signal and an error rate; under the condition that the first incident light power is not within the first power range, adjusting the emission light power of the second optical module; when the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is smaller than or equal to a first threshold value, adjusting the linearity and / or the cross point of an eye pattern corresponding to a sending signal of the second optical module; and adjusting the temperature of the laser in the second optical module according to the first temperature adjustment step length and the bit error rate of the first signal under the condition that the first incident light power is within the first power range and the signal-to-noise ratio of the first signal is greater than a first threshold value. According to the invention, the technical problem that the optical module is sensitive to zero dispersion point distribution of the optical fiber in actual transmission is solved, and the technical effect of adaptive adjustment of dispersion in the optical module is achieved.
Owner:ZTE CORP
Pressure test and airtight test method of pressed equipment and pressure pipeline system
InactiveCN103148991AImprove securityThe detection process is fastFluid-tightness measurement using fluid/vacuumEngineeringAir tightness
The invention discloses a pressure test and airtight test method of pressed equipment and a pressure pipeline system. The method comprises the steps that air or inactive gas is regarded as a gas source of the pressure pipeline system to input inside all pressure pipelines, pressure-bearing capacity and air tightness of the equipment pipelines connected with a main system and sealing points of a root meter are tested to achieve integrated air tightness test, a nitrogen cylinder with a pressure gage is adopted to conduct off-line test to meter sealing points behind roots of all the points to determine the air tightness of all the dispersion points and achieve the distribution air tightness test. The nitrogen is used as the air source of the pressure test of the pressure pipeline system and complete test of the whole system is finished without driving a car. The method is high in security and fast in test speed. The test of the whole system is finished just in three days. The method is good in test accuracy and is particularly suitable for a new factory without support of an old factory and without enough air sources to conduct air tightness test.
Owner:GUIZHOU KAIYANG CHEM
Fiber laser
InactiveCN105449501AEffective interferenceActive medium shape and constructionPhotonic crystalWavelength
The invention discloses a fiber laser. The fiber laser comprises an ultrashort pulse fiber pumping source and a visible light enhanced pohotonic crystal fiber, wherein the ultrashort pulse fiber pumping source and the visible light enhanced pohotonic crystal fiber are connected by adopting a direct welding manner; and the central wavelength of the laser output by the ultrashort pulse fiber pumping source is consistent with the fiber zero dispersion point of the visible light enhanced pohotonic crystal fiber. The minimum wavelength of a spectral region output by the fiber laser is less than or equal to 0.4 micron and the maximum wavelength is greater than or equal to 1.1 micron, so that the working range of a visible light photoelectric detector can be completely covered so as to effectively interfere the visible light photoelectric detector.
Owner:11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Photonic crystal fiber with elliptical spiral elliptical hole structure
ActiveCN111025455ACladded optical fibreOptical waveguide light guideContinuous lightZero-dispersion wavelength
The invention belongs to the field of design and manufacturing of an optical fiber devices and relates to a photonic crystal fiber with an elliptical spiral elliptical hole structure in order to realize higher birefringence and wider spacing double-zero dispersion wavelength characteristics. The method comprises steps of constructing a substrate by using silicate soft glass, and establishing an elliptical spiral elliptical hole photonic crystal fiber calculation model; carrying out simulation calculation of the optical fiber by using simulation software to obtain a corresponding ideal geometric parameter combination when the birefringence reaches the maximum value; drawing a dispersion characteristic curve and a non-linear characteristic curve under an ideal condition, and obtaining doublezero dispersion points and a high non-linear value in an intermediate infrared region; according to a characteristic curve of the optical fiber under geometrical parameter fluctuation, proving that the structure designed by the patent has high robustness for geometrical parameter deviation in the manufacturing process. The photonic crystal fiber is advantaged in that the designed photonic crystalfiber has high birefringence, high nonlinearity and double-zero dispersion, and can meet application requirements of super-continuum light source generation.
Owner:TIANJIN POLYTECHNIC UNIV
Ultra-large bandwidth super-continuum spectrum laser source
ActiveCN105762626ABreak through the loss limitIncrease spectral bandwidthActive medium shape and constructionMiddle infraredMicro imaging
The invention provides an ultra-large bandwidth super-continuum spectrum laser source. The ultra-large bandwidth super-continuum spectrum laser source mainly comprises a pulse optical-fiber laser device, an optical fiber amplifier and a germanium oxide optical fiber, wherein the germanium oxide optical fiber is a step-index type optical fiber with a refractive structure, an optical fiber with a photonic crystal structure or a micro-structural optical fiber. The ultra-large bandwidth super-continuum spectrum laser source introduces positive waveguide dispersion through the germanium oxide optical fiber, can move zero dispersion points of the germanium oxide optical fiber from a 1.7-micron waveband to a nearby 1.5-micron waveband in the short waveguide direction, makes the zero dispersion points be close to the wave length of the pulse optical-fiber laser device and forms a group velocity dispersion curve of frequencies symmetrically distributed about the zero dispersion points. An output spectrum of the laser source can cover a middle-infrared waveband of visible light, the ultra-large bandwidth super-continuum spectrum laser source has the advantages of being of an all-fiber structure, low in cost, good in stability and the like and is easily popularized and used in the lots of fields of optical element performance testing, micro-imaging, biomedicines, broad-spectrum sensing, spectroscopy and the like in a wide-range mode.
Owner:NAT UNIV OF DEFENSE TECH
Active intruder mitigation system and method
ActiveUS10157525B2Facilitating safe outcomeMaximize protectionAlarms with smoke/gas/colored-powderSignalling system detailsDigital imagingLocking mechanism
A life safety system for mitigating injuries and fatalities to occupants of a multi-zone structure comprising a plurality of controllers, and coupled to said controller, a plurality of digital imaging devices, a plurality of locking mechanisms, a plurality of dispersion points for the dispersion of at least one dispersible substance, and a plurality of thermostatic members. The life safety system further comprises at least one monitoring location physically removed from at least one of said controllers and from at least one of said dispersion points and from at least one of said locking mechanisms and from at least one of said thermostatic members.
Owner:INTRUSION TECH INC
Method for controlling optical deformed waves to generate adjustable super-continuum spectrum
The invention discloses a new method for controlling optical deformed waves to generate an adjustable super-continuum spectrum. The method is characterized by comprising the following steps of injecting two identical monochromatic laser light sources into a two-stage cascaded optical fiber through optical coupling beat frequency and receiving output signals, wherein the first light source is usedas a pump light source, and the second light source is used as a signal light source. A two-stage cascaded optical fiber structure is adopted, the first grade is a single zero dispersion optical fiber, an optimum modulation frequency is selected to inhibit influence of noise on pulse evolution and induce the optical deformed waves to be generated relatively stably, and suitable modulation depth and optical fiber length are selected to make the optical deformed waves have higher output intensity. The second grade is a double zero dispersion optical fiber and used for controlling the optical deformed waves; by selecting the double zero dispersion optical fiber with different zero dispersion point positions, the optical deformed waves are transformed into forms of base-order solitons or dispersive waves, therefore, the smooth super-continuum spectrum with different bandwidth ranges are obtained, and meanwhile bad influence of the optical deformed waves on signal transmission of an opticalfiber system is avoided.
Owner:HUNAN UNIV
Method and device for dispersion compensation
ActiveCN105406919BAvoid interferenceAccurate identificationDistortion/dispersion eliminationTime domainData signal
Owner:ZTE CORP
Point-Vector Quadratic Envelope Method for Determining the Profile of Helical Surface by Generating Tool
InactiveCN105785914BImprove robustnessImprove control accuracyNumerical controlEngineeringEqualization
The invention belongs to the field of manufacturing a spiral curved surface, and relates to a point vector double-enveloping method for determining a machined spiral curved surface profile with an expanding tool.The method includes the steps that point dispersion is conducted on a profile bus of the expanding tool according to an equalization criterion, and normal vectors on dispersion points are added to form point vectors; a spiral motion trail of the point vectors along the curved surface of the tool and a straight line along the axis of the tool are expanded into a motion trail to conduct dispersion, the double-enveloping method of the planar point vectors is set up, the points, with the smallest directed distance from a gear, in a two-dimension point vector group is determined as enveloping points, and finally all the enveloping points are constructed into the machined spiral curved surface profile in a fitting mode.
Owner:CHONGQING UNIV
Method of Limiting the Non-Linear Phase Noise of a Phase-Modulated Optical Signal of Constant Amplitude, and an Associated Device
InactiveUS20090324246A1Good conditionDistortion/dispersion eliminationNonlinear phase noisePhase modulation
A non-linear phase noise limiter device limits the non-linear phase noise that affects a phase-modulated input optical signal of constant mean amplitude conveyed over a transmission line. The device is placed at a zero dispersion point of the transmission line, and it is suitable for suppressing amplitude fluctuations about a mean value in said optical signal.
Owner:FRANCE TELECOM SA
Method for shaping super-continuum spectrum by using cascaded optical fibers
PendingCN111934164AIncrease redshiftImprove flatnessLaser using scattering effectsOptical devices for laserUltra-widebandFrequency spectrum
The invention provides a method for obtaining an ultra-wide-band ultra-flat super-continuum spectrum in a mode of cascading two sections of single-mode photonic crystal fibers with two double-zero dispersion points respectively. A short-pulse laser light source is injected into a cascaded optical fiber with a certain length through a coupling system, an output signal is received by a spectrum analyzer, the central wavelength of the light source is located in an abnormal dispersion area of the first stage of the cascaded optical fiber, and the first stage of the optical fiber is a photonic crystal optical fiber with a wide zero dispersion frequency interval so as to greatly broaden the spectrum; and then the second-stage optical fiber is cascaded, and the position of a second zero dispersion frequency (low-frequency zero dispersion point) of the second-stage optical fiber is adjusted, so that the second-stage optical fiber is located in the spectral range of a first fundamental solitongenerated in the first-stage cascaded optical fiber at the optical fiber output end of the second-stage optical fiber, and the flatness of the spectrum is obviously improved. Meanwhile, the flatness of the spectrum can be adjusted by adjusting the pumping power and the length of the second-stage optical fiber. According to the method, the zero dispersion frequency position can be adjusted by changing the aperture size and the hole spacing of the optical fiber, the super-continuous spectrum is shaped in a targeted manner, the super-continuous spectrum in different frequency ranges is shaped selectively, and finally, the ultra-wideband ultra-flat super-continuous spectrum is obtained.
Owner:HUNAN UNIV
A system and method for spatiotemporal control and emergency guidance of tourists in a scenic spot
ActiveCN104036352BRealize reasonable regulationGuarantee the quality of the tourClosed circuit television systemsResourcesDecision schemeGuidance system
Owner:SHAANXI NORMAL UNIV
Dispersion compensation method and apparatus
ActiveCN105406919AAvoid interferenceAccurate identificationDistortion/dispersion eliminationTime domainData signal
The invention provides a dispersion compensation method and device. The method comprises the steps of collecting a time domain first signal received by a dispersion compensation module at a first preset dispersion value and converting the time domain first signal into a frequency domain first signal; denoising and processing the frequency domain first signal and obtaining frequency domain energy of a first data signal; adjusting the dispersion value of the dispersion compensation module to be a second preset dispersion value; acquiring a time domain second signal received by the dispersion compensation module at the second preset dispersion value and converting the time domain second signal into a frequency domain second signal; denosing and processing the frequency domain second signal and obtaining frequency domain energy of a second data signal; and adjusting the dispersion compensation of the dispersion compensation module based on the frequency domain energy of the first data signal and the frequency domain energy of the second data signal. The invention determines an optimal dispersion point of the dispersion compensation module by filtering, denosing and processing a scanning signal, so that the whole module can work properly at an optimal dispersion value.
Owner:ZTE CORP
A Microwave Frequency Conversion Power Divider Circuit
InactiveCN105119573BReduce work distribution pointsOptimize layoutMulti-frequency-changing modulation transferenceDividing circuitsIntermediate frequency
The invention discloses a microwave frequency conversion power division circuit, which comprises a first intermediate frequency amplifier circuit, a second intermediate frequency amplifier circuit and a switching circuit. The first intermediate frequency amplifier circuit is used to pass a first polarity signal through a first frequency mixing circuit. The obtained intermediate frequency signal is amplified, and the second intermediate frequency amplifying circuit is used to amplify the intermediate frequency signal obtained after the second polarity signal passes through the second mixing circuit, and the switching circuit is respectively connected with the first intermediate frequency amplifying circuit and the second The intermediate frequency amplifying circuit is connected to switch and output the required frequency band signal, and the first intermediate frequency amplifying circuit and the second intermediate frequency amplifying circuit are designed symmetrically. The present invention realizes Ku-band full-band reception, and the symmetrical design of the first intermediate frequency amplifying circuit and the second intermediate frequency amplifying circuit reduces the power distribution point of the circuit, avoids the different lengths of the output signal lines, and reduces the loss of the power distribution line. The power amplification components are matched uniformly, and the circuit layout is simple and clear, easy to analyze, and high in reliability.
Owner:CHINA COMM TECHHUBEI CO LTD
A method for detecting polymethoxylated flavonoids
ActiveCN106338426BEasy to detectPreparing sample for investigationRaman scatteringAdditive ingredientLinearity
Owner:INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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