53results about How to "Radiation stable" patented technology

There is provided a light-emitting apparatus with favorable radiation light intensity, which is excellent in light extraction efficiency, color temperature and color rendering property. The light-emitting apparatus includes a light-emitting element, a base body having, on its top surface, a placement portion for emplacing thereon the light-emitting element, a frame body attached to the top surface of the base body so as to surround the placement portion, a light transmitting member disposed inside the frame body so as to cover the light-emitting element, and phosphors contained in the light transmitting member, which performs wavelength conversion on the light emitted from the light-emitting element. The light transmitting member has a pre-cured viscosity ranging from 0.4 to 50 Pa.s.

An antenna system is assembled to a dielectric medium on a vehicle and is spaced from an electrically conductive member so as to allow for enhanced antenna performance. The dielectric medium has first and second surfaces and a dielectric thickness between the first and second surfaces. An antenna is mounted to the first surface of the dielectric medium for receiving and/or transmitting signals. An electrically conductive member is mounted to the second surface of the dielectric medium for providing a floating ground that forms a capacitive coupling with the antenna. The electrically conductive member is dielectrically isolated from vehicle electrical ground.

The invention discloses a back point contact crystalline silicon solar cell and a preparation method thereof. The front surface of the solar cell is passivated by a silicon nitride/alumina double-layer film, the back surface of the solar cell is passivated by an alumina/silicon nitride double-layer film, and the back surface conducts current by point contact. The preparation method comprises the following steps: preparing the silicon nitride and the alumina, opening pores on the alumina/silicon nitride on the back surface, and removing an affected layer. The solar cell has the advantages of good surface passivation effect, good ultraviolet (UV) radiance resistance performance, high photoelectric conversion efficiency and the like, the back surface enhances internal reflection on the infrared light, and the front surface double-layer anti-reflection coating reduces surface reflection.

The present invention relates to an ultra-wideband (UWB) antenna, which comprises: a rectangular aperture portion, formed from a ground plane of a printed circuit board and having an aperture; and a co-plane feeding structure, having a horizontal portion and a vertical portion, wherein the vertical portion is perpendicular to the horizontal portion, and the vertical portion is disposed in the aperture and connected with an external terminal. The ultra-wideband (UWB) antenna of the present invention can receive the wireless signal with 3.1˜10.6 GHz band, and have a very compact area (13 mm×23 mm) and is easy to be mass produced. Furthermore, a parasitism element can be added into the co-plane feeding structure, so as to reject the in-band interferences from the existing systems like 5˜6 GHz signals of wireless LAN.

The present invention provides an improved process and an apparatus for producing collimated UV radiation for exposing printed circuit boards. The process consists in shortening the optical length of the downstream optics by dividing the UV radiation over many radiation sources, and in distributing the UV radiation uniformly on the substrate by using a scanning slide.

The invention discloses anti-radiation lithium-aluminum-silicate system low-expansion window glass and belongs to lithium-aluminum-silicate system glass ceramics. The glass is prepared from, by mass, 2.5-8.5% of Li2O, 16.2-26% of Al2O3, 40-71.8% of SiO2, 0.8-4.6% of TiO2, 0.6-3.7% of ZrO2, 1.3-7% of P2O5, 0.7-3.1% of F-, 0.7-3.9% of CeO2, 1.8-6.9% of B2O3, 0.5-3.5% of Na2O, 0.4-3% of K2O, 0.6-4.5% of MgO, 0.2-5.2% of CaO, 0-3.7% of SrO, 0-3% of BaO, 1.9-8.2% of ZnO, 0-1.2% of Cl- and 0-1.3% of SO42+. The invention further provides a machining process of the anti-radiation lithium-aluminum-silicate system low-expansion window glass. The window glass has high transmission, high strength, good in cold-heat impact resistance, small expansion coefficients and anti-radiation stability, can be widely applied in the aerospace field such as a transparent observation window of a spacecraft.

The invention discloses an infrared radiation coating. The infrared radiation coating is formed by mixing a solid material with a liquid material based on a weight ratio of 1:1, wherein grain sizes of the components of the coating are from 100 nanometers to 2 microns; the liquid material is an adhesion agent; and the solid material comprises the following components in percentage by weight: 45-75percent of blackening agent, 20-45 percent of zircon sand and 0-15 percent of aluminum oxide. The grains sizes of the principal components of the coating are from 100 nanometers to 2 microns, so thatthe radiation property of the coating is improved and the service life of the coating is prolonged. The radiance (Epsilon) of the coating is higher at a high temperature of 1,000-1,400 DEG C and can reach more than 0.9; and even at the temperature of 1500 DEG C, the stable radiation still can be maintained and the normal total emissivity of the coating still can reach 0.87; meanwhile, the infrared radiation coating can be applied to different heating types of kilns.

An antenna system is provided that includes an antenna having an elongated conducting segment, such as a metal rod. An anisotropic metamaterial surrounds the elongated conducting segment of the antenna. The presence of the metamaterial remarkably expands the VSWR<2. An example antenna is a monopole antenna, such as a quarter-wavelength monopole antenna, surrounded by the metamaterial.

An antenna module mainly includes at least one antenna capable of radiating signals of two frequencies, a grounding portion, and at least one isolation metal sheet capable of isolating signals of a frequency generated by different antennas from each other to avoid interference. The antenna module is integrally formed, which can reduce the volume of the antenna module, and provide a stable radiation pattern and broadband and multi-band functions.

Disclosed herein is a high-density chip scale package which is capable of increasing circuit density and expanding a circuit-formable zone. The high-density chip scale package comprises a die having a circuit pattern formed thereon, and a printed circuit board adapted for mounting the die thereon. The printed circuit board has an area 100% to 150% as large as an area of the die, and the printed circuit board has a circuit pattern formed thereon. On the die is mounted a heat sink for radiating heat from the die. Between the printed circuit board and the heat sink is filled an encapsulant for securely connecting the printed circuit board and the heat sink and shielding the printed circuit board from the outside.

The invention provides a patch antenna with a reconfigurable directional diagram. The patch antenna comprises a microstrip resonator group, a first dielectric plate, a metal floor, a second dielectricplate and a switchable feed network which are sequentially stacked from top to bottom; and the antenna also comprises a radiation patch which works in a high-order mode TM02 and a TM20, wherein the radiation patch is placed above a microstrip resonator group in a suspended manner. The microstrip resonator group is composed of a first microstrip resonator and a second microstrip resonator which are orthogonal to each other; and the feed network is used for feeding the first microstrip resonator and/or the second microstrip resonator. The antenna has the advantages of low profile, light weight,enough bandwidth, simple structure, simplicity in operation, beam reconfiguration, stable radiation and the like; a communication system can realize reconstruction of three beams by controlling a feed conduction path of the feed network under the condition of not changing a hardware structure and a station layout; and the requirements of different application scenes can be met.

The invention relates to a thread (4, 5) for producing fabrics (2) for insect screens (1), comprising a core which has a coating (11) that comprises a heat-activatable adhesive in order to bond to itself or to other threads of the fabric (2), said core having a higher melting point than the adhesive; to a fabric (2) for insect screens (1) with a mesh (7) web structure, comprising warp threads (4) and weft threads (5) which are connected to one another by means of adhesive at node points (6); to an insect screen (1) comprising a frame (3) and a fabric (2) which is stretched by means of the frame (3); and to a method for producing fabrics (2) for insect screens (1), having the steps of a) providing threads (4, 5) as warp threads (4) and weft threads (5), b) weaving a fabric (2) using the warp threads (4) and weft threads (5), and c) heating the fabric (2) to a temperature which is higher than the melting point of the adhesive and lower than the melting point of the core in order to produce bonds between the warp threads (4) and the weft threads (5) at the thread node points (6). The aim of the invention is to provide such a thread which can be processed into an transparent fabric (2) for insect screens (1) in a particularly efficient manner. This is achieved in that the coating (11) comprises hydrophobic repellents.

The invention discloses a 5G antenna and a radiation unit thereof, the radiation unit comprises two groups of polarized orthogonal dipoles, each group of dipoles comprises two radiation arms which areoppositely arranged at an interval, and each radiation arm is provided with a first expansion branch knot and a second expansion branch knot which are arranged at an interval. The radiation unit canrealize expansion of a working frequency band and has good radiation performance. In this way, the 5G antenna adopting the radiation unit is good in radiation performance.

The present invention provides a compound represented by the following formula (I):

wherein

• • R¹ and R² each independently designates an alkyl group of 1 to 12 carbon atoms or a cycloalkyl group of 5 or 6 carbon atoms or R¹ and R² form together with the carbon atom to which they are attached a cycloaliphatic ring of 5 or 6 carbon atoms,
  • Si* represents an organopolysiloxane residue bonded via a silicon atom of this residue to the oxygen shown in formula (I), or a silane group SiR⁴R⁵R⁶, wherein R⁴, R⁵ and R⁶ each independently designates an alkyl group of 1 to 12 carbon atoms, a cycloalkyl group of 5 or 6 carbon atoms or an aryl group of 6 to 10 carbon atoms, and
  • R³ designates a hydrogen atom or a group represented by the following formula (II)

wherein

• • R⁷ and R⁸ each independently designates an alkyl group of 1 to 12 carbon atoms or a cycloalkyl group of 5 or 6 carbon atoms or R⁷ and R⁸ form together with the carbon atom to which they are attached a cycloaliphatic ring of 5 or 6 carbon atoms, and
  • Si** represents an organopolysiloxane residue bonded via a silicon atom of this residue to the oxygen shown in formula (II), or a silane group SiR⁹R¹⁰R¹¹, wherein R⁹, R¹⁰ and R¹¹ each independently designates an alkyl group of 1 to 12 carbon atoms, a cycloalkyl group of 5 or 6 carbon atoms or an aryl group of 6 to 10 carbon atoms,
  • a method to produce this compound and the use thereof as photoinitiator and/or photosensitizer.

The invention provides an ultra-wideband planar antenna array applied to a millimeter wave communication system. The planar antenna array is composed of a plurality of antenna units arranged at equal intervals and a microstrip feed network. The antenna unit sequentially comprises a radiation patch, a first dielectric substrate, a bonding layer, a metal ground, a second dielectric substrate and a microstrip feeder line from top to bottom; the radiation patch is connected with the metal ground through four metal holes penetrating through the first dielectric substrate and the bonding layer; according to the design, the antenna unit can work in a dipole mode besides working in a patch mode. In the array environment, due to the mutual coupling effect between the units, another new medium resonance mode is excited at the same time. Therefore, the antenna unit provided by the invention can work in three resonant modes at the same time, so that the planar antenna array can realize ultra-wide working bandwidth, and the radiation in the working band is stable.

The invention discloses a thermal-infrared-spectrum atmospheric extinction measurement method and device. The device comprises a normal-temperature surface source black body. A plane mirror is disposed right ahead the normal-temperature surface source black body in a light transmission direction; and a Fourier spectrometer is disposed at the right side of the plane mirror in a light transmission direction. An aperture diaphragm is arranged between the normal-temperature surface source black body and the plane mirror in the light transmission direction and is arranged at an optical chopper. A chopper plate of the optical chopper is arranged in front of the normal-temperature surface source black body; and the center of the chopper plate is located at the right side of the normal-temperaturesurface source black body. A neutral infrared attenuation sheet is also arranged on the chopper plate. According to the invention, the atmospheric extinction is inverted by measuring atmospheric radiation spectra at different zenith angles, so that the dependence on standard satellites is eliminated and the infrared atmospheric extinction spectral distribution can be obtained simply, convenientlyand efficiently. The high-precision measurement of spectral atmospheric extinction can be realized; and a problem that the calibration black body and atmospheric radiance exceed the linear dynamic range of a measuring instrument is solved.

The invention provides a shielding device for controlling an irradiation dose of an electron beam. The shielding device comprises a bottom plate, a support, a plurality of supporting columns, whereinthe supporting columns are fixed above the bottom plate, a liquid container arranged on the support and comprising a container main body and a container top plate, a fixing piece used for fixing the container top plate on the container main body in a height-adjustable manner, and optionally, a liquid level meter disposed on an outer side of the container main body, wherein a liquid is contained between the container main body and the container top plate. The invention also provides a shielding method for controlling the irradiation dose of the electron beam.

The invention discloses a miniaturized teapot-shaped ultra-wideband antenna with a frequency range of 3.0-28.7 GHz. The miniaturized teapot-shaped ultra-wideband antenna comprises a dielectric substrate, a radiation patch, a microstrip feeder line and a truncated grounding plate. The radiation patch adopts a circular structure to load a rectangular branch knot and an L-shaped branch knot structure; and the microstrip feeder line adopts a stepped structure, and the grounding plate adopts a triangular corner cut structure, namely triangular corner cut is performed on the left upper corner and the right upper corner of the grounding plate respectively. According to the invention, the circular structure is adopted to load the rectangular branch knot and the L-shaped branch knot to serve as the radiation patch, the circular structure achieves the basic wideband performance, the rectangular branch knot expands the high-frequency range, the L-shaped branch knot expands the low-frequency range, the three structures are combined together, and the bandwidth of the ultra-wideband antenna is expanded; the micro-strip feeder line adopts the stepped structure and is used for impedance matching; due to a corner cut grounding plate structure, a return loss curve becomes smoother, and radiation is more stable; and the antenna provided by the invention has the advantages of a wide frequency band range, a simple structure, a good radiation characteristic and a high anti-interference capability.

A dual-band antenna includes a feeding portion, a radiating portion, a grounding portion, and an insulating support portion. The insulating support portion includes a first support wall, a second support wall, and a third support wall. The third support wall is parallel to the substrate, and perpendicularly connected to the first support wall and the second support wall, to position the radiating portion.

The invention discloses an infrared source circuit of a carbon-sulfur determination analyzer, which comprises a constant current source Darlington pipe drive circuit, an infrared source and a direct current supply, wherein the constant current source Darlington pipe drive circuit is provided with a pulse signal input end, the constant current source Darlington pipe drive circuit is connected with one end of the infrared source, and the direct current supply is connected with the other end of the infrared source. The infrared source of the circuit is driven by the constant current source Darlington pipe drive circuit to realize the modulation of the infrared source, thereby saving the cost and the structure space of a chopping motor, simplifying the system design and more easily realizing the modulation of the infrared source; the adoption of electrical modulation has the largest advantages of no movable members, more stable radiation of the infrared source for the outside, high system accuracy, long life and low cost.