111results 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.

In some aspects, a scintillator composition includes, prior to annealing, the composition (G_1-x-yA_xRE_y)_aD_zO₁₂, 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 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 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: (Lu_2−w−x+2yA_wCe_xSi_1−y)_1−zMe_xJ_jO_q and (Lu_{2−w−x−2y}A_wCe_xSi_1+y)_1−zMe_zJ_jO_q. 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.

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 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 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.