112results about How to "Short decay time" patented technology

Hafnium oxide HfO2 scintillator compositions are doped with titanium oxide and at least an oxide of a metal selected from the group consisting of Be, Mg, and Li. The scintillator compositions can include sintering aid material such as scandium and / or tin and a rare earth metal and / or boron for improved transparency. The scintillators are characterized by high light output, reduced afterglow, short decay time, and high X-ray stopping power. The scintillators can be used as detector elements in X-ray CT systems.

Scintillator compositions having a garnet crystal structure useful for the detection of high-energy radiation, such as X, beta, and gamma radiation, contain (1) at least one of terbium and lutetium; (2) at least one rare earth metal; and (3) at least one of Al, Ga, and In. Terbium or lutetium may be partially substituted with Y, La, Gd, and Yb. In particular, the scintillator composition contains both terbium and lutetium. The scintillators are characterized by high light output, reduced afterglow, short decay time, and high X-ray stopping power.

The invention discloses a novel transparent glitter ceramic with a garnet structure and a preparation method thereof. The glitter transparent ceramic has the garnet structure, and the general formula of the ceramic is as follows: Rex: (A1-yBy)m-x(C1-zDz)8-mO12, wherein the definitions of Re, A, B, C, D, x, y, z and m are stated in a specification and claims. The preparation method of the glitter transparent ceramic comprises the steps of burdening, drying, firing, grinding, moulding, sintering and cooling. The glitter transparent ceramic has the advantages of high optical property, fast attenuation, high density and low cost, and can be applied to modern nuclear medical diagnosis equipment.

A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and / or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.

An apparatus and method for disinfestation of temperature sensitive and other commodities using short duration, high peak power radio frequency pulses and intense electric fields to preferentially induce drift of conduction charges, spot heating and other mortal damage to infesting insects and mites without raising the temperature of the host commodity. A low frequency mode is provided with a frequency range of approximately 10 Hz to 1 MHz and is particularly suited for large batch processing of pallets or field containers. A high frequency mode is also provided that is suited for continuous or small batch processing and uses a preferred frequency range of approximately 1 MHz to 150 MHz. Both modes preferably have an electric field strength of greater than approximately 5 kV / cm and pulse repetition rates of between one pulse and approximately 10 million pulses per second. The method is non-contact, residue free and effective with all biological stages of an infesting insect, mite or other biological pest including egg, pupa, larvae, juvenile and adult forms. The apparatus and methods of the invention are an effective alternative to methyl bromide fumigation that does not leave any toxic residues or damage the cosmetic appearance or flavor of the commodity.

The present invention provides for a composition comprising an inorganic scintillator comprising a lanthanide-doped strontium barium mixed halide useful for detecting nuclear material.

The invention provides a fiber base multilayer structure friction nanometer power generator and a preparation method thereof. The fiber base multilayer structure friction nanometer power generator ischaracterized in that the power generator comprises an electropositive friction layer and a multilayer structure electronegative friction layer; the electropositive friction layer and the multilayer structure electronegative friction layer are static spinned nanofiber films; the multilayer structure electronegative friction layer comprises an electric storage layer, a conductive layer and a friction contact layer, wherein the electric storage layer, the conductive layer and the friction contact layer are successively arranged from bottom to top; and the electropositive friction layer and the electronegative friction layer can contact with each other or be separated from each other for generating electric charges. The prepared multilayer structure friction nanometer power generator has advantages of increasing shortcircuit current by 40-150%, boosting open-circuit voltage by 100-250%, and increasing electric quantity by 40-100%. The friction nanometer power generator according to the invention has advantages of high surface charge density, low volume mass, simple structure and short process flow. The fiber base multilayer structure friction nanometer power generator can efficientlycollect mechanical energy generation in human body movement and has wide application range in the field of microelectronics.

In some aspects, a scintillator composition includes, prior to annealing, the composition (G1-x-yAxREy)aDzO12, wherein D is selected from the group consisting of Al, Ga and In, G is selected from the group consisting of Tb, Y, La, Gd, and Yb, A is selected from the group consisting of Lu, Y, La, Gd, and Yb, and RE is selected from the group consisting of Ho, Er, Tm and Ce, and x is in the range from 0 up to about 0.2774, inclusive, y is in the range from about 0.001 up to about 0.012, inclusive, a is in the range 2.884 up to about 3.032, inclusive, and z is in the range from about 4.968 up to about 5.116, inclusive.

The invention relates to a detector arrangement (21) for a tomographic imaging apparatus, particularly for a positron emission tomograph. The detector arrangement (21) according to the invention includes at least two sandwiched pairs of a scintillator (22-24) and an associated photodetector (25-27), wherein the pairs are sandwiched along a direction of detection.

An illuminating device includes a fluorescent lamp including a blue phosphor and a red phosphor applied on an inner surface, the fluorescent lamp emitting blue light and red light from the blue phosphor and the red phosphor, respectively; and a green phosphor layer disposed outside the fluorescent lamp, the green phosphor layer containing a green phosphor containing Eu2+ or Ce3+ as a luminescent center. Green light emitted from the green phosphor excited by the blue light is mixed with the red light and the blue light so that white light is emitted from the illuminating device.

A sintered, annealed scintillator composition, which, prior to annealing, has a formula of A3B2C3O12, where A is at least one member of the group consisting of Tb, Ce, and Lu, or combinations thereof, B is an octahedral site (Al), and C is a tetrahedral site (also Al). One or more substitutions are included. The substitutions may may be partial or, in some cases, complete, and can include Al with Sc at B, up to two atoms of oxygen with fluorine and the same number of Ca atoms at A, replacement at B with Mg and the same number of atoms of oxygen with fluorine, replacement at B with a combination of Mg / Si Mg / Zr, Mg / Ti, and / or Mg / Hf, replacement at B with a combination of Li / Nb and / or Li / Ta, and at A with Ca and replacement of an equal number of B or C with silicon.

A method of making LSO scintillators with high light yield and short decay times is disclosed. In one arrangement, the method includes codoping LSO with cerium and another dopant from the IIA or IIB group of the periodic table of elements. The doping levels are chosen to tune the decay time of scintillation pulse within a broader range (between about ˜30 ns up to about ˜50 ns) than reported in the literature, with improved light yield and uniformity. In another arrangement, relative concentrations of dopants are chosen to achieve the desired light yield and decay time while ensuring crystal growth stability.

The invention discloses a bearing detecting device and method. The detecting device comprises a micro vibration sensor and a processor embedded into the same part of a bearing, and the processor is connected with the micro vibration sensor; and the detecting device comprises transmitting and receiving antennas, the transmitting antenna is embedded into the part where the micro vibration sensor is positioned, and the receiving antenna is arranged beyond the bearing. The detecting method comprises that the micro vibration sensor embedded in the bearing is used to detect an acceleration signal of the bearing; Fourier transform is carried out on the acceleration signal to obtain a characteristic frequency spectrum of the bearing; and the characteristic frequency of the bearing matches a known fault characteristic frequency of the bearing to obtain fault information of the bearing. According technical schemes of the invention, a sensor can be arranged close to the bearing as possible, and attenuation of a fault signal of the bearing is reduced.

The inorganic scintillator of the invention has the chemical composition represented by CexLnySizOu (where Ln represents at least two elements selected from among Y, Gd and Lu. 0.001≦x≦0.1, 1.9≦y≦2.1, 0.9≦z≦1.1, 4.9≦u≦5.1) and emits fluorescence upon incidence of radiation, wherein the maximum peak wavelength in the intensity spectrum of the emitted fluorescence is a peak in the range between 450 nm and 600 nm.

The present invention relates to a set of multi-doped cerium-activated scintillation materials of the solid solutions on the basis of the rare earth silicate, comprising lutetium and having compositions represented by the chemical formulas: (Lu2−w−x+2yAwCexSi1−y)1−zMexJjOq and (Lu2−w−x−2yAwCexSi1+y)1−zMezJjOq. The invention is useful for detection of elementary particles and nuclei in high-energy physics, nuclear industry; medicine, Positron Emission Tomography (TOF PET and DOI PET scanners) and Single Photon Emission Computed Tomography (SPECT), Positron Emission Tomography with Magnetic Resonance imaging (PET / MR); X-ray computer fluorography; non-destructive testing of solid state structure, including airport security systems, the Gamma-ray systems for the inspection of trucks and cargo containers.

A new inorganic scintillating material is provided represented by the formula Ln(1-m-n)HfnCemA(3+n), where A is Br or Cl, or I, or a mixture of at least two halogens of the group, Ln is an element from the group: La, Nd, Pm, Sm, Eu, Gd, Tb, Lu, Y. A new crystal scintillator is also provided represented by the formula Ln(1-m)CemA3:n.Hf4+, where Ln(1-m)CemA3 represents the chemical composition of the matrix material, A is Br, or Cl, or I, or a mixture of at least two halogens from the group, Ln is an element from the group: La, Nd, Pm, Sm, Eu, Gd, Tb, Lu, Y; Hf4+ is a dopant. A radiation detector comprising a scintillating element based on the novel inorganic scintillating material is also provided.

The embodiment of the invention provides a gate driving circuit and a driving method thereof as well as a display device, relates to the technical field of displaying and can solve the problems of signal receiving strength reduction and signal delay of pixel units farther from shift registers. The gate driving circuit is used for driving at least two adjacent gate lines, namely a first gate line and a second gate line on a display panel; the gate driving circuit at least comprises a first shift register unit, a second shift register unit and a precharge unit; the precharge unit is connected with the first gate line, the second gate line, a first clock signal terminal and a second clock signal terminal, and used for outputting signals of the first clock signal terminal to the second gate line under the control of the second clock signal terminal and the first gate line; the rising edge of output signals of the second clock signal terminal is positioned between the rising edge and the failing edge of the output signals of the first clock signal terminal or the falling edge of the second clock signal terminal is positioned between the rising edge and the falling edge of the output signals of the first clock signal terminal.

The present invention refers to active optoceramics with a cubic crystal structure, a method of producing the same and its use, particularly to the optoceramics having high transmissions, high densities and high effective atomic numbers. The optoceramics are doped with activator elements. The materials are suitable to absorb high-energy radiation and transform it to photons of visible light. Thus the materials suit as scintillator media for e.g. medical imaging (CT, PET, SPECT or combined PET / CT systems), security (X-ray detectors) or can serve in object tracing or investigation (exploration, prospecting for resources). The crystallite grains, forming the materials of the present invention, have cubic crystal structures (point and space groups as well as atom layers isotypic to those of the pyrochlore or fluorite minerals) or are clearly derivable from both mentioned minerals in terms of crystal structure. and have the following formula: A2+xByDzE7, wherein 0<=x<=1.1, 0<=y<=3, 0<=z<=1.6, and 3x+4y+5z=8, and wherein A is at least one trivalent rare earth cation, B is at least one tetravalent cation, D is at least one pentavalent cation, and E is at least one divalent anion.

The invention relates to a preparation method of Pr<3+> doped (Yx La (1-x)) 2 O3 luminescent material, namely, a preparation method of Pr<3+> doped (Yx La (1-x)) 2 O3-based fluorescent powder and transparent ceramic, belonging to the technical field of technique for manufacturing novel luminescent material and special type ceramic. The method takes high-purity Pr6O11 (99.99%), Y2O3 (99.99%) and La2O3 (99.99%) as raw materials, and adopts a solid phase method and a liquid phase method to prepare the (Y (1-x ) Lax) 2 O3: Pr<3+> fluorescent powder; by adopting the traditional ceramic sintering technique, the Pr<3+> doped yttrium lanthanum oxide transparent scintillating ceramic under the no-pressure reducing atmosphere and the vacuum condition, the temperature range of sintering is 1500-1800DEG C, and the time thereof is 3-30h. The fluorescent powder and the transparent scintillating ceramic which are prepared by the method have good optical property, and the transparent ceramic has higher transmission and luminescence as well as good scintillating performance.

The invention relates to a guided mode resonance wave shifting device for scintillation detection. The guided mode resonance wave shifting device comprises a substrate layer and a luminous film layer arranged on the substrate layer, and also comprises a photonic crystal layer arranged on the luminous film layer, wherein the photonic crystal layer consists of dielectric cylinders arranged into a period array in a triangular structure; the dielectric cylinders are vertically arranged on the upper surface of the luminous film layer; the materials of the dielectric cylinders are transparent for the light emitted by the luminous film layer. Compared with the prior art, the guided mode resonance wave shifting device has the advantages that the conversion efficiency and the time distinguishing capability are high; high light emission direction regulation and control capability is also realized; the detection efficiency on scintillation fluorescence such as ultraviolet rays can be improved.

A cerium-activated brominated rare earth scintillant and method for preparing same belongs to the scintillating materials field. The scintillant in the invention uses brominated rare earth compound or mixture thereof as the substrate and halogen cerium compound or mixture thereof except for bromine as the activating agent. The chemical formula of the scintillant is (1-a)ReBr3.aCeX3, wherein Re is one of or mixture of two to four of lanthanum, gadolinium, lutecium and yttrium, X is one or mixture of two to three of F, Cl and I and a is the moore percentage of CeX3, 0 C09K 11 / 85 4 20 3 2007 / 6 / 1 101054522 2007 / 10 / 17 000000000 Beijing Glass Research Institute Beijing 100062 Zhang Mingrong Zhang Chunsheng Ge Yuncheng Guo Jianjun Fan Yuhong Lu Hong Ding Xiaodong Zhang Hongmei hewen ban 11138 San-gao Patent Agency Room 111, the East Building 1, No.17, the West Road of Beisanhuan, Beijing 100088

The invention discloses a positron annihilation lifetime spectrometer based on a silicon photomultiplier (SiPM), and the lifetime spectrometer comprises a SiPM detector module, an analog signal processing module, a timing and discrimination circuit module, a digital acquisition circuit module, a matching unit and a low voltage power supply module, wherein the SiPM detector receives gamma photons and generates scintillation light, which is converted into a photoelectric signal by the SiPM; the photoelectric signal is processed into a pulse signal through further amplification, noise reduction and the like by the analog signal processing module; the pulse signal is timed and discriminated by the timing and discrimination circuit module to obtain position information, energy information and time information of the gamma photons; the information is acquired by the digital acquisition circuit module and filtered by the matching unit to a meeting event; and all the modules are powered by thelow voltage power supply module. The positron annihilation lifetime spectrometer can improve measurement accuracy, reduce measurement time, greatly reduce cost, reduce power supply requirements and simplify the spectrometer structure.

The invention relates to a novel method and a model for improving the modulation depth of a dye doped organic thin film all-optical switch. The method has the following main characteristics that: two linearly polarized light beams which are orthogonal and have a phase difference of 180 degrees are used to excite the switch in an alternating way to speed up a restoration process of the switch, so as to increase the speed and the modulation depth of the switch and increase the speed and modulation depth of the all-optical switch at low exciting power at the same time. The invention also provides a novel all-optical switch model based on the novel method, namely, an orthogonal linearly polarized light excited dye doped organic thin film all-optical switch module. The method has the advantages that: the response speed of the all-optical switch is increased obviously; the modulation depth of the all-optical switch under conditions of a low exciting light power and a high speed switching frequency is obviously improved; and compared with the prior all-optical switch, the orthogonal linearly polarized light excited all-optical switch has a simpler optical path and adjusting method.

The invention provides a scintillation crystal containing a fluorescent component with excellent luminous efficiency and short decay time while the wavelength of the emitted light being in the visible light region or very near the visible light region and a radiation detection device using the scintillation crystal having an excellent timing resolution capability. Barium chloride (BaCl 2 ) is used as the scintillation crystal. A radiation detection device comprising a barium chloride crystal as a scintillator and a photomultiplier tube to receive the light from the scintillator wherein the wavelength of the light emitted from the scintillator is between 250 nm and 350 nm and the scintillator is located in a low humidity atmosphere.