43 results about "Redshift" patented technology

General method for extracting source distance information from any kind of received radiation, including electromagnetic and acoustic, without involving round-trip time or phase in any form, and thus more truly passive than existing passive radars. The method exploits the facts that radiation from a real source must comprise wavepackets of nonzero bandwidth, that the individual frequency components of a wavepacket must have consistent phase at the source, and that their instantaneous phases must increase linearly along the path in proportion to the respective frequencies, so that the phase gradient across the components must be proportional to the distance travelled. The invention simplifies over naïve phase gradient measurement by scanning the phase gradient at a controlled rate, thereby converting the gradient into normalized frequency shifts proportional to the scanning rate and the source distance. It mimics the cosmological redshift and acceleration, but at measurable levels over any desired range and even with sound. Potential applications include stealth and “unjammable” radars for the military, ranging capability for emergency services, commodity low-power vehicular and personal radars, simplification and improvements in radar and diagnostic imaging, improved ranging in general all the way from ground to inter-galactic space, “interference-free” communication systems including radio and television receivers, source-distance (or range-division) multiplexing improved cellphone power control and battery life, and continuous, transparent diagnostics for optical fibres, integrated circuits and transmission lines.

A new technique and Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures in semiconductor materials is disclosed. The Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures provides activation of the “Coulomb explosion” mechanism in a manner which does not invoke or require the conventional avalanche photoionization mechanism, but rather utilizes direct interband absorption to generate the Coulomb explosion threshold charge densities. This approach minimizes the laser intensity necessary for material removal and provides optimal machining quality. The technique generally comprises use of a femtosecond pulsed laser to rapidly evacuate electrons from a near surface region of a semiconductor or dielectric structure, and wherein the wavelength of the laser beam is chosen such that interband optical absorption dominates the carrier production throughout the laser pulse. The further application of a strong electric field to the semiconductor or dielectric structure provides enhancement of the absorption coefficient through a field induced redshift of the optical absorption. The use of this electric field controlled optical absorption is available in all semiconductor materials and allows precise control of the ablation rate. When used in conjunction with nanoscale semiconductor or dielectric structures, the application of a strong electric field provides for laser ablation on sub-micron lateral scales.

The invention discloses an alga identification and measurement sensor and method. The sensor comprises a multi-wavelength high-brightness LED (light-emitting diode) excitation light source, an optical lens, an optical filter, a light-splitting optical grating, a photoelectric detection unit consisting of a plurality of photoelectric detectors with different detecting wavelengths and an electronic circuit system and the like which are in integrated arrangement, and meanwhile, an ultrasonic generator, a temperature sensor and a mechanical cleaning device and the like are integrated in the sensor. In the method, a multi-wavelength fluorescence detection technology is adopted and information, such as alga ingredients and concentration and the like in a water body is obtained through measuring an excitation spectrum of the alga in the water body and carrying out corresponding calculation. According to the invention, the multi-wavelength fluorescence detection technology is adopted, the problem of detection error caused by Redshift can be effectively solved and the actual excitation fluorescence spectrum and the alga information can be effectively reflected. The alga identification and measurement sensor and method are particularly suitable for long-term monitoring and on-site real-time, fast and accurate measurement of alga in water body environments.

General method for extracting source distance information from any kind of received radiation, including electromagnetic and acoustic, without involving round-trip time or phase in any form, and thus more truly passive than existing passive radars. The method exploits the facts that radiation from a real source must comprise wavepackets of nonzero bandwidth, that the individual frequency components of a wavepacket must have consistent phase at the source, and that their instantaneous phases must increase linearly along the path in proportion to the respective frequencies, so that the phase gradient across the components must be proportional to the distance travelled. The invention simplifies over naïve phase gradient measurement by scanning the phase gradient at a controlled rate, thereby converting the gradient into normalized frequency shifts proportional to the scanning rate and the source distance. It mimics the cosmological redshift and acceleration, but at measurable levels over any desired range and even with sound.Potential applications include stealth and “unjammable” radars for the military, ranging capability for emergency services, commodity low-power vehicular and personal radars, simplification and improvements in radar and diagnostic imaging, improved ranging in general all the way from ground to inter-galactic space, “interference-free” communication systems including radio and television receivers, source-distance (or range-division) multiplexing improved cellphone power control and battery life, and continuous, transparent diagnostics for optical fibres, integrated circuits and transmission lines.

The invention belongs to a field of high-molecular material, and relates to a preparation method of a polymer photonic crystal with a photonic band gap capable of being adjusted in a wide range of UV-visible-near infrared. The method comprises firstly synthesizing polymer hydrogel polymer microsphere with monodisperse size, obtaining the polymer photonic crystal through centrifugation, deposition and other ways, adjusting content of injected water so that a dimensional ordered structure of the microsphere of the polymer photonic crystal occurs controllable volume expansion, and furthermore adjustability of crystal lattice period of the ordered structure becomes large, and a peak position of a diffraction spectrum occurs redshift, thereby obtaining the polymer photonic crystal with the photonic band gap in a wide range of UV-visible-near infrared. The polymer photonic crystal can be used for preparing sensitive optical path conversion devices. The material capable of rapidly responding according to external environmental stimulation and obtaining synchronous signal conversion develops a polymer responsive material system, and has important application value in aspects of sensor elements, optical information storage and regulation, and biological monitoring.

The invention provides a hydrophobic visible light response type nano TiO2 photocatalyst, wherein visible light is modified by utilizing CuO to load TiO2, and the loading amount of the CuO is between 0.4 and 14 g / g TiO2; sodium dodecylsulfate SDS is utilized to perform hydrophobic modification on the surface of CuO / TiO2, and the loading amount of the SDS is between 0.2 and 4 g / g TiO2; and the specific surface area of the catalyst is between 200 and 400 m2 / g, and the average grain diameter is between 10 and 40 nanometers. The SDS is absorbed on the surface of the catalyst, and residual stable hydrophobic groups after calcination make the CuO / TiO2 have hydrophobicity, change the 'amphiphilic' property of the TiO2 photocatalyst into hydrophobic selectivity, and can make difficultly biodegraded organic substances in aqueous phase have the advantage of competitive adsorption and be preferably degraded. Simultaneously, the loaded CuO composition can make absorption edges of the TiO2 subjected to redshift, realize electronic cavity separation under visible light radiation, and improve the utilization rate of quanta.

The invention discloses a method using a derivatization HPLC-DAD method to determine small-molecule halogenated carboxylic acid in medicine.The method includes: under normal temperature, using nitrobenzene hydrazine derivatization reagent to derivatize the small-molecule halogenated carboxylic acid so as to generate products with high absorption in the ultraviolet visible region; using the reaction liquid after the derivatization reaction as the feeding sample, and using the HPLC-DAD method to determine the derivatization products of halogenated carboxylic acid in the feeding sample in the ultraviolet visible region on the basis of the reversed phase partition chromatography principle so as to achieve the qualitative or quantitative detection of the small-molecule halogenated carboxylic acid.Due to the fact that the ultraviolet absorption band of the carboxylic acid derivatization products of the nitrobenzene hydrazine derivatization reagent has evident redshift effect due to the existence of nitro electron-withdrawing group on benzene ring and most medicine and impurities thereof are weak in absorption in the ultraviolet visible region (300-450 nanometers), the simple and universal method using pre-column derivatization HPLC-DAD to determine the small-molecule halogenated carboxylic acid is built.Methodology validation shows that the method is good in specificity.

The invention discloses an annular resonant cavity temperature drift compensation method and a system thereof and relates to the integrated photoelectron technology field. The method comprises the following steps: S1. acquiring an increased temperature of the resonant cavity and calculating a variation of resonance wavelength redshift of a resonance ring; S2. determining an effective resonance coupling coefficient which can make blue shift of the resonance wavelength on the resonance ring; S3. establishing a corresponding relation between the effective resonance coupling coefficient of the resonant cavity and the variation of the blue shift of the resonance wavelength of the resonant cavity; S4. selecting a compensation resonance coupling coefficient corresponding to the variation of the resonance wavelength redshift according to the corresponding relation; S5. adjusting the effective resonance coupling coefficient to the compensation resonance coupling coefficient. In the invention, through adjusting the effective resonance coupling coefficient of the resonance ring, the resonance wavelength redshift of the resonant cavity caused by temperature change can be avoided and normal working can be performed.

The invention discloses a novel method for constructing a Zn2+ ratio detecting system by solubilizing single probe molecules through surfactant micelle. A fluorescent molecule probe is made of 8-carboxyl acylamino quinoline simultaneously solubilized into sodium lauryl sulfate micelle and to the surface of the micelle, probe molecules positioned on the surface of the micelle indicates identification signals of fluorescent enhancement and wavelength redshift for Zn2+, fluorescent signals of probe molecules positioned inside the micelle are approximately not affected by the Zn2+, and the fluorescent peak is used as an interior label to realize Zn2+ ratio fluorescence detection.

The invention discloses a red and orange light fluorescent powder with garnet structure. The fluorescent powder has a chemical expression of Mg3-xAxY2-y-cByAlz-aCaSi3-z-bDbO12-zEz:cCe<3+>, wherein A represents a composition of one or more than two selected from Ba, Sr and Ca in arbitrary proportion, B represents a composition one or more than two selected from Gd, La and Sc in arbitrary proportion, C represents Ga, D represents Ge, E represents F or Cl, x, y,z, a, b and c represent corresponding mole fractions and satisfy the relations of: 0<=x<0.35, 0<=y<0.35, 0<z<=2, 0<=a<0.5, 0<=b<0.35, 0<c<0.2, and z-a>0. Under the excitation of blue light in wavelength of 455nm, the yellow and orange light fluorescent powder has emission wavelength range of 500-750 nm, wherein the main emission wavelength range is 600-621 nm, the emission spectrum shows obvious redshift compared with YAG (delta S=45-85 nm), and the preparation temperature is low.

The invention discloses a composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: firstly, titanium dioxide collosol, phosphotungstic acid and propylene glycol methyl ether, of which the mass ratio is 20 to 3 to 50, are uniformly mixed to form composite collosol; secondly, the composite collosol is heated for 30 minutes at the temperature of 300 DEG C to form dried gel; and finally, the dried gel is mechanically processed for two hours by ball milling so as to obtain phosphotungstic acid-titanium dioxide photorecombination photocatalyst materials. Compared with the prior art, the phosphotungstic acids of the invention are combined into a stable netty structure in the form of W-O-P molecular linkages, thereby reducing the oxidation-reduction potential, enabling a titanium dioxide composite membrane photoabsorption wavelength to generate redshift, and improving the utility ratio of titanium visible light; and further more, after the subsequent step of heating photocatalysis materials is accomplished, the keggin structure of the phosphotungstic acid is not affected, and high catalytic activity can still be maintained.

A new technique and Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures in semiconductor materials is disclosed. The Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures provides activation of the “Coulomb explosion” mechanism in a manner which does not invoke or require the conventional avalanche photoionization mechanism, but rather utilizes direct interband absorption to generate the Coulomb explosion threshold charge densities. This approach minimizes the laser intensity necessary for material removal and provides optimal machining quality. The technique generally comprises use of a femtosecond pulsed laser to rapidly evacuate electrons from a near surface region of a semiconductor or dielectric structure, and wherein the wavelength of the laser beam is chosen such that interband optical absorption dominates the carrier production throughout the laser pulse. The further application of a strong electric field to the semiconductor or dielectric structure provides enhancement of the absorption coefficient through a field induced redshift of the optical absorption. The use of this electric field controlled optical absorption is available in all semiconductor materials and allows precise control of the ablation rate. When used in conjunction with nanoscale semiconductor or dielectric structures, the application of a strong electric field provides for laser ablation on sub-micron lateral scales.

The invention relates to an optical fiber hot-wire type wind gage based on a tilted fiber bragg grating which uses wavelength demodulation method to achieve wind power measurement and solves problems that an ordinary optical fiber sensor is complex in structure and high in cost. The optical fiber hot-wire type wind gage based on a tilted fiber bragg grating is capable of enabling pump light source to enter a wind gage through a wavelength division multiplexer, being coupled into a cladding of a cladding mode of the tilted fiber bragg grating, heating a metallic film plated on the surface, raising temperature of the optical fiber to cause redshift of wavelength of the tilted fiber bragg grating, lowering the temperature of the optical fiber by wind to cause blueshift of wavelength of the tilted fiber bragg grating, and obtaining information related to the wind power through wavelength measurement by broadband light source and a spectrometer. The optical fiber hot-wire type wind gage based on the tilted fiber bragg grating is small in size, simple in structure, low in cost, strong in operability, and capable of being widely used in various wind monitoring fields.

The invention relates to a method for performing colorimetric detection on ractopamine by virtue of AuNPs protected by citric acid radical, which belongs to the technical field of analytic chemistry. The method is characterized in that the AuNPs protected by the citric acid radical can be drawn to be accumulated by ractopamine, so that the color of an AuNPs solution is changed from wine red to blue, the redshift occurs on an absorption peak, and the residue of ractopamine in food can be detected through eyes and by an ultraviolet spectrophotometer. The detection method comprises the steps of preparing AuNPs protected by citric acid radical; and detecting the ractopamine by a colorimetric method. By the method, the ractopamine can be simply, rapidly and sensitively detected, and convenience can be brought to research, production, supervision and the like in future.

The invention discloses a method and a device for generating a broadband continuously tunable coherent extreme ultraviolet source. The method comprises the following steps of generating a femtosecond laser beam; focusing the laser beam to working gas, wherein the laser beam and the working gas interact under a vacuum environment to generate higher harmonics; adjusting the incident energy of the laser beam or the gas pressure of the working gas so as to change the phase matching conditions of the higher harmonics to cause the red shift or the blue shift of the frequency of the higher harmonics, therefore realizing the continuous tuning of harmonic radiation wavelengths of all orders of the coherent extreme ultraviolet source. The invention also provides a method for realizing the method. By implementing the method and the device disclosed by the invention, the continuous tuning of the harmonic radiation wavelengths of all the orders of the coherent extreme ultraviolet source can be realized.

The invention discloses a composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: firstly, titanium dioxide cThe invention discloses a composite nanometer phosphotungstic acid-titanium dioxide photocatalysis material and a preparation method thereof. The method includes the steps: firstly, titanium dioxide cstill be maintained.an still be maintained.ght; and further more, after the subsequent step of heating photocatalysis materials is accomplished, the keggin structure of the phosphotungstic acid is not affected, and high catalytic activity can ght; and further more, after the subsequent step of heating photocatalysis materials is accomplished, the keggin structure of the phosphotungstic acid is not affected, and high catalytic activity c liollosol, phosphotungstic acid and propylene glycol methyl ether, of which the mass ratio is 20 to 3 to 50, are uniformly mixed to form composite collosol; secondly, the composite collosol is heated foollosol, phosphotungstic acid and propylene glycol methyl ether, of which the mass ratio is 20 to 3 to 50, are uniformly mixed to form composite collosol; secondly, the composite collosol is heated for 30 minutes at the temperature of 300 DEG C to form dried gel; and finally, the dried gel is mechanically processed for two hours by ball milling so as to obtain phosphotungstic acid-titanium dioxider 30 minutes at the temperature of 300 DEG C to form dried gel; and finally, the dried gel is mechanically processed for two hours by ball milling so as to obtain phosphotungstic acid-titanium dioxidephotorecombination photocatalyst materials. Compared with the prior art, the phosphotungstic acids of the invention are combined into a stable netty structure in the form of W-O-P molecular linkages, photorecombination photocatalyst materials. Compared with the prior art, the phosphotungstic acids of the invention are combined into a stable netty structure in the form of W-O-P molecular linkages, thereby reducing the oxidation-reduction potential, enabling a titanium dioxide composite membrane photoabsorption wavelength to generate redshift, and improving the utility ratio of titanium visiblethereby reducing the oxidation-reduction potential, enabling a titanium dioxide composite membrane photoabsorption wavelength to generate redshift, and improving the utility ratio of titanium visibleli

A light emitting device is provided to produce white light with a stable correlated color temperature and stable color coordinates. The light emitting device includes a blue LED chip and a yellow phosphor. The blue LED chip has a peak wavelength X slightly smaller than the peak wavelength Y of the phosphor such that when the light emitting device is subjected to a predetermined operating current, the phosphor decays due to thermal effect, and the LED chip has its emission spectrum red-shifted to substantially match with the excitation spectrum of the phosphor. At this time, the excitation ability of the LED chip is increased and causes an increase of yellow power output from the phosphor that substantially compensates a decrease of yellow light output caused by the phosphor.

The invention relates to the technology of doped preparation of photocatalytic materials, in particular to a method for preparing homogeneous boron / nitrogen-doped red titanium dioxide. The method comprises specific steps as follows: nitrogen-containing decomposable solid organic matter is used as a doping nitrogen source, boron-doped titanium dioxide and the nitrogen source are placed in a sampledevice to provide a relatively airtight doping environment, homogenous boron / nitrogen doping of titanium dioxide is realized by controlling heating temperature and treatment time, so that overall redshift of titanium dioxide light absorption edges is realized, the obtained boron / nitrogen-doped titanium dioxide photocatalysis material has high absorbance in the whole visible light range, and the photocatalytic application potential of the material is enhanced significantly.

The invention discloses a benzothiadiazole unit-based A-pi-A'-pi-A type acceptor photovoltaic material, and a preparation method and an application thereof, and belongs to the field of organic photoelectric materials. The material adopts benzothiadiazole as a nucleus, adopts a nitro group and a 4-fluorophenyl group as end groups, and adopts a 2-cyano-styryl group as a pi connecting bond; and alkyl-modified thienyl groups are introduced to two sides of the benzothiadiazole unit in order to improve the solubility of the material, extend the conjugation length of a molecule and enhance the intramolecular charge transfer ability. The organic small molecular material obtains Jsc exceeding 1.0 mA cm<-2>, and has large redshifts being 34 nm and 38 nm respectively. The PCE of the material is increased from 0.1% to 1.0% and increases 10 times after replacing the nitro end group (M1) with the 4-fluorophenyl group (M2) due to the M2 having high Jsc and Voc, so the M2 material has higher potentialto be a high-efficiency non-fullerene small molecular acceptor photovoltaic material than the M1.

The invention discloses a water wave redshift measuring system and method based on a Chen Shouyuan effect. The system is suitable for the condition that a water wave transmission medium is free from longitudinal movement. The water wave redshift measuring system based on the Chen Shouyuan effect comprises a sound wave source, at least two transverse wave probes and a controller, wherein the amplitude, transmission frequency and phase size of the sound wave source are preset; the sound wave source is arranged at a preset geographic position in a selected water area; the at least two transverse wave probes are arranged on the circumference of different concentric circles taking the sound wave source as a circle center; the transverse wave probes are provided with unique codes according to the positions of the transverse wave probes; the transverse wave probes are used for acquiring transverse wave signals which are transmitted to the positions at which the transverse wave probes are positioned and coding information of the transverse wave probes, and transmitting the transverse wave signals and the coding information to the controller; the controller is used for resolving the received signals to obtain the amplitudes, the transmission frequencies and the phase size information of transverse waves collected by the transverse wave probes, so that a water wave redshift value can be obtained.

The invention discloses a N-TiO2 / BaAl2O4:Eu<2+>,Dy<3+> composite photocatalyst, and belongs to the category of catalyst. The N-TiO2 / BaAl2O4:Eu<2+>,Dy<3+> composite photocatalyst can be applicable for acatalytic conversions of vapor organic contaminants. Compared to pure TiO2, the N-TiO2 / BaAl2O4:Eu<2+>,Dy<3+> composite photocatalys has substantially improved catalytic activity and has response ability to visible light. Because partial photo generated holes generated from the BaAl2O4:Eu<2+>,Dy<3+> migrate to a valence band of the N-TiO2 under illumination, photogenerated electrons of a conduction band of the N-TiO2 are captured through trapping level formed through a lattice defect of the BaAl2O4:Eu<2+>,Dy<3+>, such that the photogenerated electrons of the N-TiO2 is separated from the photo generated holes of the N-TiO2, recombination rate is reduced, and the catalytic activity is raised. In addition, in the N-TiO2, because a localized state of an N2p orbital is formed above the valence band of the TiO2, width of a forbidden band of the TiO2 is narrow, a absorption edge of the TiO2 has a redshift, and a spectral response range of the TiO2 is developed to the visible region.

The invention provides a long-afterglow light conversion agent and a preparation method thereof, and a long-afterglow light conversion film and a preparation method thereof, belonging to the fields of light conversion agents and light conversion films. The long-afterglow light conversion agent has a chemical general formula of SrAl<2>O<4-3x / 2>N<x>: Eu<2+>,Re<3+>, wherein Re<3+> is one or a mixture of more than one selected from a rare earth element group consisting of Dy<3+>, Nd<3+>, La<3+>, Ho<3+>, Pr<3+> and Er<3+>, and x is in a range of no less than 2 / 3 and no more than 2. The long-afterglow light conversion agent has the advantages that the long-afterglow light conversion agent can sufficiently absorb violet light and near-ultraviolet light in sunlight; and through creative introduction of N3<-> ions for reconstruction of a crystal field environment around a luminescence center, emission wavelength undergoes redshift to a red-light area.

The invention belongs to the field of fluorescent powder preparation and in particular relates to a method for improving the luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate. In order to solve the problem of deficiency of low color rendering index of a white LED (light-emitting diode) formed by combining Ce-doped YAG fluorescent powder with a blue LED, the (Y,Gd)AG:Ce fluorescent powder is prepared by adopting a bismuth nitrate pentahydrate modified reverse-titration co-precipitation method, and the energy of Bi<3+> can be transmitted to Ce<3+> through sensitized luminescence of Bi<3+> to enable Ce<3+> to obtain more energy. Therefore, the luminescence of the (Y,Gd)AG:Ce fluorescent powder is enhanced on the basis of wavelength redshift, and then the performance of yellow fluorescent powder is improved.

The invention discloses a blue light wavelength redshift blue light filtering displayer which comprises an LED, a light guiding plate, an optical film material, a lower polarizer, an LCD and an upperpolarizer. By means of the blue light wavelength redshift blue light filtering displayer disclosed by the invention, a dominant wavelength of a blue light ingredient entering the eyes of a user is 460nm to 480nm; thus, harm of display equipment to the eyes of the user is reduced. Specifically, blue sub pixel of the blue light wavelength redshift blue light filtering displayer disclosed by the invention can send out blue light with the dominant wavelength as 460nm to 480nm, and the blue light can synthesize different colors with other pixels to enter the eyes of the user. Therefore, harmful blue light as 450nm or lower with very large harm to the human eyes is avoided, and after the user utilizes the blue light wavelength redshift blue light filtering displayer for a long time, cataract ormacular degeneration caused by 450nm blue light is avoided.

The present invention relates to the field of displays and discloses a polyimide substrate, which is manufactured by reacting lignin, polyimide and a free radical initiator. Because lignin contains various active groups, for example, hydroxyl, carboxyl and aryl, etc., when it is introduced into the polymer structure of polyimide, the maximum absorption peak of the polymer can be made to redshift from less than or equal to 280 nm to less than or equal to 380 nm, so that a certain absorption and screening action may be laid on the light wave during a subsequent Laser Lift Off process, and the substrate and the liquid crystal may be prevented from being damaged during a Laser Lift Off process of the glass base substrate, thereby guaranteeing the display quality of the flexible display.

The invention belongs to a field of high-molecular material, and relates to a preparation method of a polymer photonic crystal with a photonic band gap capable of being adjusted in a wide range of UV-visible-near infrared. The method comprises firstly synthesizing polymer hydrogel polymer microsphere with monodisperse size, obtaining the polymer photonic crystal through centrifugation, deposition and other ways, adjusting content of injected water so that a dimensional ordered structure of the microsphere of the polymer photonic crystal occurs controllable volume expansion, and furthermore adjustability of crystal lattice period of the ordered structure becomes large, and a peak position of a diffraction spectrum occurs redshift, thereby obtaining the polymer photonic crystal with the photonic band gap in a wide range of UV-visible-near infrared. The polymer photonic crystal can be used for preparing sensitive optical path conversion devices. The material capable of rapidly responding according to external environmental stimulation and obtaining synchronous signal conversion develops a polymer responsive material system, and has important application value in aspects of sensor elements, optical information storage and regulation, and biological monitoring.

The invention relates to gadolinium doped zinc oxide nanoparticles and a preparation method thereof. The gadolinium doped zinc oxide nanoparticles are characterized in that the gadolinium doped zinc oxide nanoparticles are evenly dispersed nanoparticles with diameter of 2-6 nm; fluorescence spectrum shows that the nanoparticles have excitation wavelength of 320-360 nm and emission wavelength of 500-560 nm; the excitation wavelength and the emission wavelength show redshift with the increase of the doping amount of gadolinium; the fluorescence intensity first increases then decreases with the increase of the doping amount of gadolinium; and when a molar ratio of zinc to gadolinium is at 1:0.08, the fluorescence enhancement reaches the maximum. The product has application prospect in magnetic resonance and fluorescence double functional imaging. The invention has the advantages that a cheap zinc material with good biocompatibility is employed for direct synthesis of gadolinium doped zinc oxide nanoparticles through a sol-gel method, the method on the one hand reduces the toxicity of the final product, and on the other hand reduces the cost of the product, and the product has application prospect in magnetic resonance and fluorescence double functional imaging.

The invention discloses a system and a method for telecommunication based on a Chen Shouyuan effect. The system is suitable to be used for a condition that a transmission medium does not have longitudinal drift motion. The system for telecommunication based on a Chen Shouyuan effect comprises a signal source whose amplitude, propagation frequency, and a phase value are preset, at least two electromagnetic wave data acquisition units, and a controller. The signal source is on a preset geographic position of the transmission medium no longitudinal drift motion region. The electromagnetic wave data acquisition units are respectively arranged on the circumferences of different concentric circles whose centers are the signal source. The electromagnetic wave data acquisition units have unique codes according to positions of the electromagnetic wave data acquisition units. The electromagnetic wave data acquisition units are used to acquire electromagnetic wave signals transmitted to the positions where the electromagnetic wave data acquisition units are arranged, and coded information of the electromagnetic wave data acquisition units, and the electromagnetic wave signals and the coded information are transmitted to the controller. The controller is used to analyze received signals, to obtain the amplitude of an electromagnetic wave, propagation frequency and phase value information obtained by each electromagnetic wave data acquisition unit, so as to obtain redshift of electromagnetic waves.

The invention discloses a method and a device for processing a Redshift external table dynamic column. The method comprises the following steps: loading first header information of a Redshift externaltable, wherein the first header information comprises a column name of an external table, a mapping relation between the column name and a to-be-stored Spark Data Frame column, and a use condition ofthe column name; according to the first header information, carrying out one-to-one mapping on the column of the Redshift external table and the column of the to-be-stored Spark Data Frame, and generating second header information of the Redshift external table; according to the second header information, updating the header structure of the to-be-stored Spark Data Frame, and obtaining the updated Spark Data Frame; and storing the updated Spark DataFrame in the Redshift external table. According to the technical scheme provided by the invention, the column structure of the Redshift external table can be dynamically changed, and the operation is simplified.