55 results about "Radiation stability" patented technology

A composite film is disclosed, comprising a protective layer comprising an adhesion-modified polyolefin film, a coating layer comprising the reaction product of a crosslinkable compound, an initiator, and a binder; and a polycarbonate layer; wherein the coating layer is disposed between the protective layer and the polycarbonate layer, and the peel strength between the protective layer and the polycarbonate layer, as measured both before and after thermal treatment or a combination of thermal and UV treatment of the composite film, is about 1 to about 20 centi-Newtons per centimeter measured using 180° angle peel measured at a peel rate of 25.4 cm/min. A method for forming a composite film, and an article comprising the composite film, are also disclosed.

The invention discloses a vivaldi antenna, and relates to the technical field of antennas for communication. The vivaldi antenna comprises a first antenna unit and a second antenna unit of the same size, wherein the first antenna unit and the second antenna unit include antenna dielectric plates and radiation patches; an upper side of the middle of a dielectric layer on the first antenna unit is provided with a first slot from top to bottom; the radiation patch on the second antenna unit is symmetrically arranged on an upper surface of the dielectric layer with the first slot as an axis of symmetry; a lower side of the dielectric layer on the second antenna unit is provided with a second slot from bottom to top; the radiation patch on the second antenna unit is symmetrically arranged on the upper surface of the dielectric layer with the second slot as an axis of symmetry; and the first antenna unit and the second antenna unit are connected together in a crosswise manner. The vivaldi antenna has the advantages of high gain, high efficiency and radiation stability.

The invention relates to a phase-change material based heat radiator. The heat radiator comprises a phase-change device, at least one heat pipe, a plurality of radiating fins and a fan. The phase-change device comprises an outer shell and an inner cavity in the outer shell, and the inner cavity is used for filling of a phase-change material. The outer shell is provided with via holes outside the inner cavity, each heat pipe comprises a heat absorption section and a heat release section, each heat absorption section penetrates the corresponding via hole, and each heat release section extends upwards. The radiating fins sleeve the heat release sections of the heat pipes, and the fan is mounted on one side of the radiating fins. The phase-change material based heat radiator is high in airtightness, heat radiation performance and heat radiation stability, operating time of electronic components such as a CPU (central processing unit) can be prolonged, reliability and stability in operationof the electronic components are improved, and service lives of the electronic components are prolonged.

The invention discloses a 3-sulfoglutaramide type extraction agent. The invention simultaneously provides a preparation method and application of the extraction agent. The preparation method comprises the following steps: firstly reacting methanol with thiodiacetic acid to obtain dimethyl thiodiacetate, and finally reacting corresponding amine with dimethyl thiodiacetate to obtain corresponding 3-sulfoglutaramide. The extraction efficiency of the extraction agent against a precious metal, namely palladium, is 98.16%-99.22%. The extraction agent can be simultaneously applied to a mixed solution containing palladium, platinum, copper, iron, zinc and other base metals for recovering palladium. The preparation method disclosed by the invention is simple and easy to operate, and the extraction agent has excellent extraction performance against palladium ions in a high-acid solution; and furthermore, the extraction agent is stable to a strong acid and good in radiation stability, the synthesis method is simple, and the cost is low.

The invention relates to a method for improving the stability of vacuum ultraviolet calibration light source, which is realized by arranging a tubular liquid nitrogen refrigeration screen coaxial with outgoing light beam on the external end of an outgoing window of a standard light source chamber in a vacuum chamber, thereby reducing the temperature of the outgoing window area of the light source, improving the vacuum degree of the area and reducing the quantities of contamination molecules near the outgoing window. The method of the invention effectively improves the radiation stability of the standard light source of a space ultraviolet remote sensing instrument in a vacuum ultraviolet band, thus realizing the high-precision radiation calibration of the ultraviolet spectrum remote sensing instrument.

Polymer compositions and articles formed therefrom are described herein. The compositions include a random copolymer and a radiation additive, wherein the random copolymer includes propylene and less than 2 wt.% ethylene and exhibits a melt flow rate of from about 300 to 100 dg/min., the polymer composition exhibits a flexural modulus of from about 160 kpsi to about 200 kpsi and the polymer composition is adapted to produce a polymer article exhibiting low plate out, a haze at 20 mils of no greater than 15%, radiation stability and autoclavability.

The invention discloses a heat radiation device and a refrigerator, and relates to the technical field of heat radiation. According to the main technical scheme, the heat radiation device comprises a heat pipe and a heat radiator. The heat pipe is provided with a condensation segment and at least two evaporation segments. The condensation segment is arranged between any two adjacent evaporation segments. The heat radiator comprises cooling fin assemblies arranged on the condensation segment. The evaporation segments of the heat pipe are used for being connected with the hot end of a semiconductor refrigeration plate so that liquid work media in the evaporation segments can absorb heat of the hot end of the semiconductor refrigeration plate and then be vaporized. The vaporized work media diffuse in the condensation segment, and the vaporized work media in the condensation segment are cooled by the heat radiator to be liquefied. The liquefied work media flow back into the evaporation segments. The heat radiation device is mainly used for providing a heat pipe heat radiation structure suitable for the hot end of the semiconductor refrigeration plate, the heat radiation stability of the heat radiation device is improved, and the performance of the semiconductor refrigerator is guaranteed.

The benefits of liquid crystal polymers and polyetherimides are combined in an all-aromatic thermoplastic liquid crystalline polyetherimide. Because of the unique molecular structure, all-aromatic thermotropic liquid crystal polymers exhibit outstanding processing properties, excellent barrier properties, low solubilities and low coefficients of thermal expansion in the processing direction. These characteristics are combined with the strength, thermal, and radiation stability of polyetherimides.

The invention discloses a fluorescent microcapsule and a preparation method thereof. According to the invention, polyelectrolyte and graphene quantum dots are used as capsule wall materials; and through layer-by-layer electrostatic self-assembly of cationic polyelectrolyte and electronegative graphene quantum dots, the fluorescent microcapsule is prepared. Based on fluorescence radiation characteristic and good biocompatibility of graphene quantum dots, the fluorescent microcapsule with advantages of simple preparation method, good fluorescence radiation stability and good biocompatibility canbe prepared. The technical problem that a capsule can be endowed with the fluorescent property only through complex fluorescent derivation of capsule wall materials in the prior art is solved.

The invention provides a driving device and a robot with a gamma ray protection function, including a driving mechanism, an end load of the driving mechanism, and an electrical component for controlling the driving mechanism, and the driving device includes a gamma ray for placing the electrical component A protective structure, the gamma ray protective structure includes a protective shell with a built-in cavity, a protective shell end cover placed on the upper end of the protective shell for supporting the drive mechanism, and a detachable Port sealing structure. The invention not only effectively improves the radiation stability of electronic devices, but also facilitates disassembly by placing electrical components in a protective structure with gamma ray protective effect and designing a detachable port sealing structure.

The invention relates to an ultra-wideband dual-polarization array antenna unit, and belongs to the field of radar antennas. The invention provides a metal oscillator antenna and an additional structure thereof. A metal base and a radiation arm are combined to form a basic radiation structure of the oscillator antenna, and the two metal oscillator antennas with the same structure and size are orthogonally combined to form a dual-polarization radiation antenna structure. Two dielectric plates are loaded right above the antenna, the size of the first dielectric plate is the same as that of an antenna unit plane grid, and two microstrip lines are etched on the upper part of the first dielectric plate; the second dielectric plate is located at the center of the first dielectric plate and is smaller than the first dielectric plate in size; and a cross-shaped microstrip strip is etched at the upper part of the second dielectric plate, and the second dielectric plate is connected with the lower part of the first dielectric plate in a mode of loading a metalized through hole in the center. The array unit antenna can be used for construction of an ultra-wideband dual-polarization array, and good matching and radiation stability in the ultra-wideband range of the array antenna are effectively realized.

The invention provides an organosilicon polymerization curing agent. The organosilicon polymerization curing agent comprises 37 to 57 parts of epoxy silicone oil, 1 to 5 parts of an organic amine curing agent, and 0.01 to 0.1 part of a curing accelerator. In applications of the organosilicon polymerization curing agent, epoxy groups in epoxy silicone oil are reacted with the organic amine curing agent in the presence of the curing accelerator, and ring opening crosslinking curing is carried out so as to obtain a polymer cured body, and coating of radioactive solid waste is realized. Accordingto the applications, after curing of the radioactive solid waste with the organosilicon polymerization curing agent, an obtained cured product is excellent in radiation stability, toughness, aging resistance, and biodegradation resistance, possesses certain rigidity, and is relatively high in modulus; and product deformation is not easily caused.

The invention relates to the technical field of preparation of doped semiconductor nanometer materials for light emitting diodes, solar cells and other photoelectronic devices, particularly to a method for synergistically enhancing the ultraviolet radiation stability and the optical performance of Mn:CsPbCl3 nanocrystals. The method comprises: 1) preparing a cesium oleate solution; 2) preparing anSn precursor; 3) loading manganese chloride, lead chloride, the Sn precursor obtained in the step 2), octadecene, oleic acid, oleylamine and trioctylphosphine into a three-necked flask, wherein a molar ratio of Mn to Pb in the Sn precursor, the manganese chloride and the lead chloride is 1:1, and a molar ratio of Sn to Pb is less than 1/1; and 4) heating the transparent solution obtained in the step 3) to a temperature of 150-250 DEG C, measuring the solution obtained in the step 1), adding the solution obtained in the step (1) into the transparent solution obtained in the step (3), stirring,and cooling with an ice bath to obtain the Sn-doped Mn:CsPbCl3 nano-crystals. According to the present invention, with the method, the ultraviolet radiation resistance of the Mn:CsPbCl3 nano-crystalsis effectively improved, and the light emitting performance of the Mn:CsPbCl3 nano-crystals is improved.

The invention relates to an organic thermal control coating with low solar absorptivity and a preparation method. The coating comprises a bottom coating, a middle coating and a surface coating. The bottom coating, the middle coating and the surface coating all take space-stable organic silicon resin as an adhesive; zinc orthotitanate is selected as a coating filler in the bottom coating, the zinc orthotitanate is spherical, the particle size is 1-3 microns, the purity is greater than or equal to 99.99%, and the pigment-agent ratio is 3-5; the middle coating adopts a rare earth oxide as a coating filler, the rare earth oxide is one or more of lanthanum oxide, europium oxide, yttrium oxide, samarium oxide and gadolinium oxide, the rare earth oxide is spherical, the particle size is 3-5 microns, the purity is greater than or equal to 99.99%, and the pigment-agent ratio is 3-5; the surface coating selects zinc oxide as a coating filler, the zinc oxide is spherical, the particle size of the filler is 50-200nm, the purity is greater than or equal to 99.99%, and the pigment ratio is 1.5-3.5. The scattering capability of different spectral energy of sunlight and the vacuum ultraviolet radiation stability are greatly improved, so that the design requirements of high precision and long service life of a modern novel spacecraft can be met.

The invention relates to a vacuum infrared calibration radiation response consistency method. Aiming at the problem of inaccurate acquisition of a calibration coefficient and a platinum resistance conversion coefficient of each channel of an infrared radiometer caused by lens pollution, non-uniformity of temperature of a detection head and the like in a vacuum infrared calibration process, surface source black body and on-satellite black body temperature change data obtained in infrared calibration are utilized; the responsivity of the calibration state in the vacuum infrared calibration process of the infrared radiometer is subjected to radiation consistency processing, so that the radiation accuracy in the process of transmitting the radiation from the space radiation reference to the on-satellite black body is ensured; According to the vacuum infrared calibration radiation response consistency method, an infrared channel radiation calibration response consistency model is established based on an infrared radiometer linear response system, infrared radiometer single system state response stability and space radiation reference source radiation stability, infrared radiometer radiation calibration data reprocessing is realized, and the vacuum infrared radiation calibration precision is effectively improved.

The invention discloses a measurement and calibration method of a tooth whitening cold light instrument. The measurement and calibration method comprises the following steps of (1) setting environmental conditions for measurement and detection, (2) setting technical requirements of the radiometer, and (3) respectively carrying out a working wavelength range test, a radiation test in a range of 400-650 nm, a radiation uniformity test, a radiation stability test, a radiation test above 650 nm and an ultraviolet radiation illumination test. The measurement characteristics of the tooth whitening cold light instrument and a corresponding measurement and calibration method are given, and measurement indexes of the measurement characteristics are put forward.