61results about How to "Easy to excite" patented technology

The invention discloses a preparation method of a transparent nano-cellulose paper with fluorescence properties. According to the method, TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxyl) is employed to perform oxidation modification on natural nano-cellulose fiber, and the coordination mechanism of rare earth complexes is utilized for the first time to graft a rare earth complex with fluorescence properties to the modified nano-cellulose fiber in situ so as to obtain a nano-cellulose sol with fluorescence properties, and finally through a high pressure filtration method, the self-assembled fluorescent transparent natural nano-cellulose paper can be synthesized by one step. The transparent nano-cellulose paper with fluorescence properties provided by the invention has the characteristics of naturalness, environmental protection, no toxicity or harm, high light transmission, good flexibility, easy excitation, and advanced synthetic process, etc.

A Lamb-wave resonator includes: a piezoelectric substrate; an IDT electrode disposed on one principal surface of the piezoelectric substrate, having bus bar electrodes each connecting one ends of a plurality of electrode finger elements, the other ends of the plurality of electrode finger elements being interdigitated with each other to form an apposition area; and a pair of reflectors disposed on the one principal surface of the piezoelectric substrate, and respectively arranged on both sides of the IDT electrode in a propagation direction of a Lamb wave, wherein denoting a thickness of the piezoelectric substrate in the apposition area of the electrode finger elements as ti, a thickness of the piezoelectric substrate in areas between respective ends of the apposition area in a direction perpendicular to the propagation direction of the Lamb wave and the bus bar electrodes as tg, and a wavelength of the Lamb wave as λ, the thickness ti exists in a range represented by 0<ti/λ≦3, and a relationship of tg<ti is satisfied.

A technique for utilizing tube waves to measure sound speed of fluids and other properties in the frequency range of about 5 to 100 kHz. A drill string is equipped with a sensor tube having a cavity filled with a downhole fluid such as borehole mud or formation fluid. An acoustic transmitter and an array of acoustic receivers are mounted on the tube in direct contact with the fluid. Processing circuitry calculates a property, e.g., sound speed, of the fluid based on time-of-flight of an acoustic signal generated by the transmitter and received by the array of receivers. Alternatively change in signal phase as a function of frequency may be employed by the processing circuitry. The technique is particularly suited to measuring the sound speed of borehole mud in situ.

The invention discloses a preparation method of oxygen-sulfur dual-doped graphite phase carbon nitride. The method comprises the following steps: performing one-step thermal polymerization on melamineand L-cysteine at a temperature of 400-700 DEG C according to a mass ratio (1.5-2.5):100 of the L-cysteine to melamine, thereby obtaining the oxygen-sulfur dual-doped graphite phase carbon nitride. According to dual doping in the invention, the element O and the element S respectively enter the graphite phase carbon nitride in a chemical bond form. The energy gap of the doped graphite phase carbon nitride is reduced, the impedance is reduced, the graphite phase carbon nitride has high photocatalytic activity, and the photocatalytic nitrogen fixation efficiency of 2.0% of GCNOS reaches 0.509 mMg<-1>h<-1> within 240 minutes, and reaches 2.1 times that of the photocatalytic nitrogen fixation efficiency of pure graphite phase carbon nitride.

An ultrasonic transducer with a housing having an ultrasonic window in a first region of the housing for transmitting ultrasonic waves, and a transducer element located in the housing adjacent to the ultrasonic window. To prevent ultrasonic waves from being transmitted as housing waves between the first region of the housing, by way of at least one intermediate second region of the housing, to a third region of the housing on opposite side of the second region from the first region, in the second region of the housing, at least two weakly coupled mechanical resonators are provided which are arranged essentially in secession in the propagation direction of the housing waves.

The fiber laser beam processing apparatus includes a fiber laser oscillator, a laser power source unit, a laser injecting unit, a fiber transmission system, a laser beam irradiating unit, a processing table, etc. The fiber laser oscillator includes an optical fiber for oscillation, an electric optical pumping unit that applies an excitation beam for optical pumping onto an end face of the optical fiber for oscillation, and a pair of optical resonator mirrors optically facing each other through the optical fiber for oscillation. The optical fiber for oscillation includes a core extending on the central axis thereof, a clad surrounding the core, an air layer surrounding the clad, and a support surrounding and supporting the air layer.

An expansion valve capable of reducing noise due to acoustic resonance by allowing for adjustment of resonance characteristics of piping connected to a restricting portion and filled with a substantially liquid refrigerant, and an air conditioner using the same are provided. The expansion valve has a valve body 1, a restricting portion 18 formed inside the valve body 1, two piping connection portions 11, 12 communicating with the upstream side and the downstream side of the restricting portion 18, and at least one opening 30 that opens a refrigerant flow passage to outside of the valve body 1, the refrigerant flow passage extending from the piping connection portion 12 to which a piping 19 filled with a substantially liquid refrigerant is connected to the restricting portion 18. The valve body 1 is formed in such a manner that a resonance adjuster 31 having a resonance space and adjusting resonance characteristics of the piping 19 filled with a substantially liquid refrigerant can be attached to the outside so as to communicate with the opening 30.

This invention provides nanocrystals or polymer doped nanocrystals of hydrophobic organic fluorescent dyes as stable dispersions in an aqueous system. The dispersions can be prepared without stabilizers such as surfactants and the like. The aqueous dispersions of the nanocrystals or the polymer doped nanocrystals can be used for bioimaging.

The invention discloses a plant active component extraction device and application thereof in cosmetics. The device comprises a base, a distillation mechanism, an extrusion mechanism, a condensation mechanism, a crushing mechanism and a water circulation mechanism, and the front sides and the rear sides of the condensation mechanism and the crushing mechanism are fixedly connected with the top ofthe distillation mechanism through a rack, the distillation mechanism comprises a distillation box fixed to the front side of the top of the base, and a heating plate is fixedly connected to the bottom of the inner surface of the distillation box. The invention relates to the technical field of distillation equipment. The invention discloses the plant active component extraction device and application thereof in cosmetics. The extrusion mechanism is arranged on the distillation box, juice in plants is fully squeezed out through an extrusion force, then distillation is conducted through the distillation mechanism, compared with direct plant cooking, active substances in the plants can be extracted more fully and thoroughly, waste is little, cost is reduced, the extrusion mechanism is of a movable design, the extrusion mechanism can be directly pulled out upwards, internal residue can be poured out conveniently, and use is convenient.

The invention discloses a method for preparing a composite nano Tb/BiOCl material. The method comprises the following steps: firstly, putting potassium chloride into ethylene glycol so as to form a solution A; putting bismuth nitrate pentahydrate into ethylene glycol so as to form a solution B, and dropping the solution A into the solution B one droplet by one droplet till the ratio of n(Bi) to n(Cl) is 1:1; after dropping is completed, continuously stirring, adding terbium nitrate, and performing ultrasonic oscillation so as to obtain a mixed solution; transferring the mixed solution into a reaction kettle, sealing, and putting into an oven for reactions; after the reactions are completed, naturally cooling the reaction kettle to the room temperature, collecting solid precipitate, washing, and drying, thereby obtaining the composite nano Tb/BiOCl material. The composite nano Tb/BiOCl material prepared by using the method has relatively good catalytic degradation properties upon methylorange under visible light.

The invention discloses a silver ion doped zinc thioindate heterojunction photocatalyst preparation method, and relates to a catalyst preparation method, which comprises: carrying out a reaction on silver nitrate, zinc acetate, indium acetate, thioacetamide and indium oxide according to a certain ratio under an oil bath heating condition to obtain a target photocatalyst. According to the invention, the novel visible light photocatalyst is clear in structure and definite in composition; by doping with Ag<+>, the photon utilization rate of ZnIn2S4 can be remarkably increased; by compounding withIn2O3, the diffusion range of photon-generated carriers can be enlarged, the electron-hole pair is effectively separated, the recombination of photo-induced electron-hole pairs is inhibited, and theutilization rate of photo-induced electrons is greatly increased, so that the catalytic activity of visible light is enhanced; and the Ag:ZnIn2S4/In2O3 composite material has high visible light activity, good hydrogen production capacity and good photocatalytic stability, so that the Ag:ZnIn2S4/In2O3 composite material has wide prospect in the field of clean energy production and energy conversion, and is a catalyst with good development prospect.

A surface acoustic wave device includes interdigital transducer (IDT) electrode and reflectors disposed on a piezoelectric substrate. Each of the IDT electrode and the reflectors has a multi-layer film structure including at least one layer (high specific gravity metal component containing layer) including as a major component a metal with a specific gravity of at least about 15 and having a film-thickness of at least about 10 nm, and at least one layer (low specific gravity metal component containing layer) including as a major component a metal with a specific gravity of up to about 10 and a volume resistivity as a bulk value (at about 20° C.) of up to about 10×10⁻⁸ Ω·m, and having a film-thickness of at least about 10 nm. For example, the multi-layer structure includes an Ni film (low specific gravity metal component containing layer) with a film-thickness of about 150 nm disposed on a Ti film, a Cu film (low specific gravity metal component containing layer) with a film-thickness of about 250 nm disposed on the Ni film, and an Au film (high specific gravity metal component containing layer) with a film-thickness of about 50 nm disposed on the Cu film.

A vibrating device includes a tubular body including a first end, a second end, and a plurality of side surfaces that connect the first and second ends, piezoelectric vibrators that are fixed to the tubular body and vibrate the tubular body, and a light transmitting body unit that is directly or indirectly connected to the second end of the tubular body.

A micromirror device including a drive unit, which includes a movable drive element, which is situated in a first plane, and a guiding device, and a mirror, which is elastically coupled to the drive element and is situated in the idle position in a second plane, which is in parallel to the first plane, the guiding device being designed to guide a movement of the drive element on a straight line situated in the first plane. Furthermore, a corresponding projection device is described.

A photoelastic modulator (PEM) has two parts (11, 13) of the same or dissimilar cross sections, joined together to form an abrupt junction (16). A transducer, for which the natural oscillation is at the half acoustic wavelength mode, excites a longitudinal standing wave of high purity in the PEM. A feedback system is used to achieve stable phase synchronisation of multiple PEMs working at the same oscillation frequency, where the outputs of an amplitude and phase sensor for one PEM is used to correct phase variations of other PEMs and to compensate optical retardation errors.

The invention discloses a method for no-reference quantitative inspection of panel thinning defect based on Lamb wave. The method comprises the following steps: solving a coefficient of the required Lamb wave reflection modal; solving a green function in a zero-defect panel; constructing a boundary integral equation by use of the dynamics reciprocal theory and far-field basic solution; substituting a reflection coefficient into the boundary integral equation and performing inverse Fourier transform to finally obtain a defect expression; and reconstructing the defect position and shape in the panel. In the invention, the problems of quantitative inspection of panel thinning defect are effectively solved, the panel defect is reconstructed by directly using the reflection information of Lamb wave without referring to any condition in advance, and an efficient and accurate method is provided for engineering quantitative detection.

A waveguide antenna assembly and process for transceiving signals of a predetermined radio frequency range comprising at least two collaterally aligned conductive layers configured in a conformable loop so as to form an electrically isolating channel dimensionally configured for support of the waveguide modes of the predetermined frequency range, an aperture for electromagnetically transceiving the signals, wherein the aperture extends along a surface of the electrically isolating channel such that the aperture extends between the outer edge of the inner surface of the first conductive layer and the second conductive layer, a back short spaced apart from the aperture a predetermined distance equal to a resonant length of the waveguide mode wavelength so as to provide a circuit impedance between the first conductive layer and the second conductive layer for tuning the waveguide to transceive the signals, and excitation points coupled to the aperture to propagate waveguide modes within the electrically isolating channel, which is conformable to the configuration of a supported electronic device.

The invention relates to the technical field of element detection, in particular to a method and device for detection of a femtosecond plasma breakdown ionization spectrum. The method for the detection of the femtosecond plasma breakdown ionization spectrum comprises the following steps: (1) putting a to-be-detected sample into a graphite heating device, introducing a current to produce high temperature for enabling the to-be-detected sample to be particlized, and injecting a particlized to-be-detected sample gas into a sample chamber; (2) focusing transmitted femtosecond pulse lasers into plasma, and enabling the plasma to act on the to-be-detected sample gas in the sample chamber and performing excitation, thus a plasma fluorescence spectrum is formed; and (3) acquiring the plasma fluorescence spectrum and performing detection by adopting a spectrum collection detection module. The method provided by the invention performs simple treatment on substances by adopting the graphite heating device, thus particlization efficiency is high; temperature of the substances is high after being subjected to pretreatment, thereby being more beneficial to follow-up excitation detection, and matrix effect is greatly overcome; and the problem that a background signal is high when the traditional nanosecond LIBS system detects an initial stage of plasma evolution is solved.

A waveguide antenna assembly conformable to the configuration of a supported device for transceiving signals of a predetermined radio frequency range comprising at least two collaterally aligned conductive layers configured in a conformable loop so as to form an electrically isolating channel dimensionally configured for support of the waveguide modes of the predetermined frequency range, an aperture for electromagnetically transceiving the signals, wherein the aperture extends along a surface of the electrically isolating channel such that the aperture extends between the outer edge of the inner surface of the first conductive layer and the second conductive layer, a back short spaced apart from the aperture a predetermined distance equal to a resonant length of the waveguide mode wavelength so as to provide a circuit impedance between the first conductive layer and the second conductive layer for tuning the waveguide to transceive the signals, excitation points coupled to the aperture to propagate waveguide modes within the electrically isolating channel for transceiving signals, and mode barrier filters longitudinally oriented in the first conductive layer and the second conductive layer to impede coupling between excitation points. A preferred embodiment of the present waveguide antenna strategically orients the mode barrier filters to enhance antenna transceiving and can be used to support switched TEM and H11 waveguide modes.

The invention discloses a europium-doped ultra-wideband red fluorescent material as well as a preparation method and application thereof. The chemical general formula of the material is K3GdSi2O7: xEu, wherein x is more than or equal to 0.002 and less than or equal to 0.2, and Eu refers to two ions coexisting in different chemical valence states of Eu < 2 + > and Eu < 3 + >. By changing the doping concentration and excitation wavelength of Eu, the chromaticity of the fluorescent powder can be controllably adjusted in a red light range. The fluorescent powder provided by the invention has a broadband excitation spectrum in ultraviolet and blue light regions (285nm to 500nm), and can be packaged on a high-brightness near ultraviolet LED chip to prepare a warm white light LED lighting device; the Eu < 2 + > fluorescent powder has ultra-wideband emission within the wavelength range of 500-815 nm, the full width at half maximum reaches up to 120 nm or above, ultra-wideband red light emission of Eu < 2 + > ions can be achieved, and the limitation that Eu < 2 + > ions in most silicate oxide fluorescent powder can only emit blue light, green light or yellow light is broken through.

The invention discloses a glass coating suspension deep undercooling fast directional solidification device and a solidification method thereof. The solidification device comprises a closed furnace body. A glass pipe, a glass pipe clamp, a ball screw, an induction heater, a thermal insulation mold shell and a water cooling copper mold are arranged in the closed furnace body. The glass pipe in the closed furnace body is placed on the clamp. The clamp is driven by the ball screw. The glass pipe is filled with alloy raw materials. The closed end of the glass pipe is located in the inner axial position of the heater. After installation, the closed furnace body is vacuumized and is filled with argon. A power source of the heater is started for heating, thus the alloy raw materials are subjected to suspension melting, an alloy melt is purified, heating is continued, and thus the alloy melt is overheated. The electric current of the heater is lowered, and a deep undercooling alloy melt is obtained. Under the action of the gravity, the deep undercooling alloy melt enters a mold cavity formed by the water cooling copper mold and the thermal insulation mold shell. Fast one-way growth of a block sample is achieved. In the operation process of the solidification method, expensive Ga-In-Sn liquid alloy is not used, thus production cost is low, and operation is simple and convenient.