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

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.

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.

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.

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 invention discloses a direct-current transmission protection device comprising a resistor unit and a two-way circulation current switch unit. The protection device is formed by connecting the resistor unit and the two-way circulation current switch unit in parallel, wherein the resistor unit is formed by at least one resistor in a cascade connection mode; the two-way circulation current switch unit is formed by at least one two-way circulation current switch in a cascade connection mode. The invention further provides a current converter comprising the protection device, and each phase unit is connected with at least one protection device in series. The invention further provides a protection method of the current converter. Vibration of direct current short-circuit current and damping current can be restrained rapidly and effectively, equipment is protected better, fault current fall time is shortened greatly, and therefore the direct current outage time is shortened. Furthermore, economic losses and system instability risk caused by outage are reduced to the maximum extent. Meanwhile, the direct-current transmission protection device is simple in structure and low in cost, and has good realizability and economical efficiency.

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.

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

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 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.

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.

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.