31results about How to "Low radiation" patented technology

A quadrifilar helix antenna (1) comprising a first and a second set of helical antenna elements (2a-5a, 2b-5b) symmetrically arranged around a longitudinal axis extending through the axial center of the antenna (1). The antenna (1) is excited from feeding points (2c-5c) in a local ground plane at the bottom (6) of the antenna. The helical antenna elements (2a-5a) of the first set are interconnected in respective top ends of the elements at the top (7) of the antenna. The bottom ends of the first set are in galvanic contact with the respective feeding points (2c-5c). The antenna is characterized in that the top ends of helical antenna elements (2b-5b) of the second set are arranged in an open circuit and remain unconnected. The bottom ends of the helical antenna elements (2b-5b) of the second set each includes a connection (2d-5d) to the local ground plane.

The invention provides novel energy-saving toughened three-silver-layer low-radiation coated glass, which is characterized in that: a film structure of the glass sequentially consists of the following layers from a glass substrate to the outside: the glass substrate, a first composite dielectric medium layer (11), a first reflection deduction layer (12), a first silver layer (13), a first protective layer (14), a second dielectric medium layer (21), a second reflection deduction layer (22) plus a second silver layer (23), a second protective layer (24), a third dielectric medium layer (31), a third reflection deduction layer (32), a third silver layer (33), a third protective layer (34), a fourth composite dielectric medium layer (35) and a fourth protective layer (36). The novel energy-saving toughened three-silver-layer low-radiation coated glass has the advantages that: an infrared reflection capacity is higher than that of a double-silver-layer low-radiation film with the same visible light transmission value, the radiation rate on the surface of the film layer is low, the shading coefficient is much lower, and the reflection rate is low; and the film has high hardness and high oxidation resistance, and different cold processing and hot treatment can be carried out after the film coating.

A heat exchanger has No.1 and No.2 manifolds with joint holes, many parallel flat tubes connecting inserting into joint holes of No.1 and No.2 manifolds, outer fins between adjacent flat tubes, with each flat tube unit composed of at least one flat through channels. There is a parallel section between the flat tubes through channels. The said flat tube channel is made of aluminum extrusion of thin wall section bars, with over one coolant and heating flow channels. It applies to horizontal flow cooler of vehicle transmission and horizontal flow water tank of automobile engine coolant, and horizontal warm air core for warm air for auto air conditioner.

An aluminum extrusion thin wall section bar is made of more than one flat though channels. The parallel through channels are independently connected through joint section horizontally, forming symmetrical or asymmetric multi through channels formed parallel flow channel. There are at least one coolant and heating agent flow channels with the cross section in any shape inside the through channel. At least part of the flow channels having the shape of round, elliptical, polygonal, wave or random combination of them to suit for varied requirements for coolants or heating agents. The parallel flow channels for coolants or heating agents form the dual flow channel aluminum extrusion thin wall section bar or multi channel aluminum extrusion thin wall section bar. Fins are used to separate the flow channels for coolants or heating agents. It can replace traditional electrolytic copper pipe, reduce energy consumption, environment pollution and improved utilization of resources. It has low recovery cost, with extensive applications.

The invention discloses a RCS reduction method of a phased array antenna based on scattering polarization reconfiguration. The RCS reduction method of the phased array antenna based on the scatteringpolarization reconfiguration comprises the following steps that S1, N array units with polarization reconfiguration are arranged on the phased array antenna, each array unit comprises three differentpolarization modes, and the N array units are regularly arranged in a rectangular grid shape; S2, when the phased array antenna radiates, N array units are in the same polarization mode to form a unified polarization array; and S3, after the radiation of the phased array antenna is stopped, the polarization of the N array units is randomly distributed to form a random polarization array. The RCS reduction method of the phased array antenna based on the scattering polarization reconfiguration can significantly reduce the RCS after the radiation of an array antenna is stopped on the basis of notaffecting the radiation performance of the array antenna.

Compounds of the formula (I) are disclosed:18F—(CHR)n(CH2)mCHO   (I)in which n and m are independently 0 and 1 with at least one of n and m being 1, and R (if present) is a hydrogen atom or a methyl group, subject to the proviso that if n is 1 and R is methyl then m is 0. Synthesis of the compounds is described together with their use in radiolabelling reactions, e.g. for the radiolabelling of peptides to facilitate detection by Positron Emission Tomography (PET) imaging.The preferred compound is [18F]Fluoroacetaldehyde.

The invention provides a low-RCS phased-array antenna and an RCS reduction method thereof. Each antenna unit comprises four layers of structures, namely, a radiation patch layer, a cross-shaped feed structure layer, a floor layer and a direct-current feed layer, and every two adjacent layers are separated through a dielectric substrate. Switching among antenna circular polarization modes and switching among antenna feed points are achieved by controlling on-off of PIN diodes, so that the effect of equivalent rotation of the antenna units in the horizontal direction is achieved, and a phase difference of 180 degrees, which is twice of the rotation angle, of the scattering fields of the antenna units is achieved. The scattering fields of the antenna units are counteracted in a far field anddispersed to a wider angular domain space, so that the RCS of the array antenna is reduced. The scattering phases of the antenna units are directly controlled, so that the scattering fields of the array elements cannot be coherently superposed or reflected to a threat-free angle, and the RCS of the array is reduced.

The invention discloses a coplanar waveguide feeding-based miniaturized wideband dielectric resonator antenna. The coplanar waveguide feeding-based miniaturized wideband dielectric resonator antenna comprises a dielectric substrate, a coplanar waveguide and an annular dielectric resonator; the coplanar waveguide includes a grounding plate, a radiation patch and a feeding part; the feeding part comprises an annular patch and central strip lines; the grounding plate includes two parts, wherein the two parts are of symmetrical structure relative to the central strip lines; two symmetrical L-shaped notches and two symmetrical rectangular notches are formed in the grounding plate; the radiation patch is composed of four 1 / 4 circular patches which are symmetrical to each other in pairs; and the annular dielectric resonator is located just at the center of the annular patch. According to the coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna of the invention, a coplanar waveguide feeding annular printed monopole antenna and dielectric resonator antenna-hybrid radiation mechanism is adopted; and a plurality of working modes of the resonator can be excited; and therefore, bandwidth can be expanded. The coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna has excellent impedance matching performance, high radiation efficiency and high peak gain. The coplanar waveguide feeding-based miniaturized wide-band dielectric resonator antenna has broadband work performance with small size ensured.

A high frequency (HF) beam antenna includes a set of radiating vertical monopole elements and a set of horizontal dipole elements. The horizontal dipole elements are parasitically coupled to corresponding radiating vertical monopole elements and are configured to counterpoise radiation from the radiating vertical monopole elements and to effectively isolate the vertical monopole elements from the underlying ground. The HF beam antenna has a high performance gain and low angles of radiation when installed at a height of 0.1 to 0.2 wavelength above ground. The HF beam antenna eliminates the need for a tower in the HF service range.

A light source module includes a wiring board and a LED array electrically connected to the wiring board. The LED array can be driven to emit a first group of emission peaks in 300 nm≦λmax<450 nm, a second group of emission peaks in 450 nm≦λmax<550 nm, and a third group of emission peaks in 550 nm for matching the spectrum of sunlight underwater. When the maximum peak intensity of the emission peaks in the second group is taken as 1.0, the peak intensity Ia of each emission peak in the first group is in a range of 0<Ia≦0.9, and the peak intensity Ib of each emission peak in the third group is in a range of 0<Ib≦0.9. Accordingly, the light source module is suitable for aquatic species and can enhance growing rate of the aquatic species.

A semiconductor device 10 includes a silicon substrate 20 having a first interconnection layer 24, a second interconnection layer 26, and grooves 22 provided at the second main surface 20b. Mounted on the substrate 20 are one or more semiconductor chips 30 having chip external terminals 32 electrically connected to the first interconnection layer; and one or more peripheral chips 40 electrically connected to the fist interconnection layer on the silicon substrate. By the provision of the grooves 22, the heart radiating property is improved.

A laminated coil includes a plurality of circular conductive plates in the form of a flat plate, each of the circular conductive plates being laminated via an insulating material in an axis direction. The plurality of circular conductive plates each include a plurality of concentric circular arc parts having different inner diameter and outer diameter from each other, and a connection part interconnecting the plurality of circular arc parts. The plurality of circular conductive plates are arranged such that the connection parts thereof face each other and the circular arc parts thereof are juxtaposed to each other in a radial direction.

A laminated coil includes a plurality of circular conductive plates in the form of a flat plate, each of the circular conductive plates being laminated via an insulating material in an axis direction. The plurality of circular conductive plates each include a plurality of concentric circular arc parts having different inner diameter and outer diameter from each other, and a connection part interconnecting the plurality of circular arc parts. The plurality of circular conductive plates are arranged such that the connection parts thereof face each other and the circular arc parts thereof are juxtaposed to each other in a radial direction.

An ultra-high-speed radiographic imaging assembly (at least 900 system speed) is useful especially for pediatric radiography to provide images with improved contrast and sharpness and reduced fog. The imaging assembly includes a symmetric film having a speed of at least 400 that includes at least two silver halide emulsion layers on each side of a film support that comprise tabular silver halide grains. The imaging assembly also includes two fluorescent intensifying screens wherein the pair of screens has a screen speed of at least 400 and the screens have an average screen sharpness measurement (SSM) value greater than reference Curve A of FIG. 4. The screens can have a support that includes a reflective substrate comprising a continuous polyester phase and microvoids containing inorganic particles dispersed within the polyester phase.

The invention discloses an oscillator of a hollow structure and a manufacturing method of the oscillator. The internal of the oscillator is of the hollow structure, a degradable material is used to prepare an oscillator core, the surface of the oscillator is metalized by coating, ageing heat treatment is carried out on an oscillator blank, the oscillator surface is cleaned, refined and then electro-plated, and the oscillator core is removed by degradation. Compared with a traditional pure metal entity structure of the antenna oscillator, the oscillator of the hollow structure ensures the radiation performance and reduces the weight, and thus, the oscillator can be widely applied to large-scale MIMO antennas.

The Invention discloses and provides a kind of dimmer holding current control circuit for phase cut dimming power supply, which comprises phase cut dimming power supply circuit and LED lamp (1) and dimmer holding current control circuit (2). The dimmer holding current control circuit (2) is composed of rectifier diode I (D1), rectifier diode II (D2), field-effect transistor (Q1), triode (Q2), current-limiting resistance I (R1), current-limiting resistance II (R2), sampling resistance I (R4), sampling resistance II (R5), diode (D3), capacitance (C1) and resistance (R3). The anodes of the rectifier diode I (D1) and the rectifier diode II (D2) are respectively connected to L terminal and N terminal of main supply input. The Invention makes the current small and stable through current limitation. The Invention can be widely used in the field of phase cut dimming power supply.

An X-ray system is described with a scatter radiation shielding device to be mounted underneath an operating table. The shielding device (10) comprises one or more layers of a radiation blocking material (6) and a cut-out (8) in the one or more layers. The cut-out extends from a point in or near a center of the one or more layers towards an edge to allow radiation transmission to pass. The shielding device is rotatable around a rotation axis. The shielding device substantially reduces the scatter radiation originating from the patient.

The invention discloses a miniaturized conformal antenna. The interior of a metal cavity is used for installing an internal module. A flexible printed board and an outer surface of the metal cavity are installed in a conformal manner. Microstrip patch antennas are fixedly connected with the flexible printed board and are at one side of the flexible printed circuit board far away from the metal cavity, and the plurality of microstrip patch antennas enclose the flexible printed board. One end of a feed network is electrically connected with each microstrip patch antenna, the other end of the feed network passes into the metal cavity and is electrically connected with an internal module, and the feed network and a radiation surface of the flexible printed board are in an integrated coplanar design. Therefore, a sensor network node can effectively utilize a space structure, the influence of the internal module on the antenna radiation performance is reduced by using the shielding effect ofthe metal cavity, and the influence on the performance of a whole machine is reduced.

The invention discloses a vibrator with a hollow structure and a manufacturing method thereof. The inside of the vibrator is a hollow structure, the vibrator core is made of a degradable material, the surface is metallized by surface coating, the vibrator blank is subjected to aging heat treatment, and the surface of the vibrator is cleaned. Refinement, electroplating on the surface of the vibrator, and finally degrading and removing the core of the vibrator. The invention is different from the pure metal solid structure of the traditional antenna vibrator. The vibrator of the hollow structure can significantly reduce the weight of the vibrator while ensuring that the radiation performance of the vibrator is not significantly reduced, so it has a good application prospect in massive MIMO antennas.

A method for processing CT imaging data includes providing CT imaging data obtained at two x-ray energy levels in a first respiratory phase, preferably in an inhalation phase, of the subject and providing second CT imaging data obtained at two x-ray energy levels in a second respiratory phase, preferably in an exhalation phase, of the subject. The method may include reconstructing first regional perfusion blood volume (PBV) imaging data from the provided first CT imaging data, reconstructing second regional PBV imaging data from the provided second CT imaging data, reconstructing first virtual non-contrast (VNC) imaging data from the provided first CT imaging data, reconstructing second VNC imaging data from the provided second CT imaging data, determining a transformation function for registering the first and second reconstructed VNC imaging data, and registering the first and second reconstructed VNC imaging data by applying the transformation function.

Compounds of the formula (I) are disclosed:18F—(CHR)n(CH2)mCHO  (I)in which n and m are independently 0 and 1 with at least one of n and m being 1, and R (if present) is a hydrogen atom or a methyl group, subject to the proviso that if n is 1 and R is methyl then m is 0. Synthesis of the compounds is described together with their use in radiolabelling reactions, e.g. for the radiolabelling of peptides to facilitate detection by Positron Emission Tomography (PET) imaging.The preferred compound is [18F]Fluoroacetaldehyde.

The invention discloses a community monitoring system based on ZigBee wireless network, which is characterized in that: it includes several family monitoring units and a monitoring center host, and the family monitoring unit includes a PLC processor, a mobile sensor, a data processing module, a ZigBee wireless communication module, the data processing module includes a network component module and a data transmission module, and the network component module is used to set up a ZigBee network, assign network addresses and maintain a binding table. The invention can accurately realize the family medical monitoring function in the community, has reliable and stable communication quality, strong anti-interference ability, low power consumption, low cost, and the personal monitoring terminal equipment is small in size, convenient to carry, and strong in usability.

The invention discloses a broadband planar printed antenna, which comprises a dielectric substrate, wherein the front of the dielectric substrate is printed with a similar C-shaped radiating element and a floor, and the back of the dielectric substrate is printed with a reverse L-shaped radiating element and a micro-strip feed line. A vertical branch in the reverse L-shaped radiating element and a second branch of a tail end open circuit element in the similar C-shaped radiating element are partially overlapped on a mirror image projection plane vertical to the dielectric substrate, and the reverse L-shaped radiating element and the similar C-shaped radiating element form cross coupling. The broadband planar printed antenna has the advantages of simple and compact structure and easiness in processing, has a certain gain and better omnidirectional radiation characteristics, and is especially suitable for a wireless communication device of a hand-held terminal.

The invention discloses a detection device for magnetic ring production processing. The detection device comprises a detection device protection shell, wherein a supporting seat is arranged on the outer wall of the bottom end of the detection device protection shell; a control cabinet and a magnetic ring detector are arranged on the left side and the right side of the top end of the detection device protection shell respectively; the center of the control cabinet is connected with a fixed plate, and a display screen and a starting button are arranged on the fixed plate separately; a high-definition camera detects the appearance of the magnetic ring and detects whether the surface of the magnetic ring is smooth or not; a pressing plate presses the magnetic ring, and detects the stress of each part on the magnetic ring and detects whether the structure is tight or not; the sound generated by the magnetic ring when the magnetic ring is pressed by the pressing plate is converted into electronic data by an audio converter to be transmitted to a controller; the performance of the magnetic ring is judged through the characteristics of clear voice and the high and low characteristics of the tone; and the magnetic ring detector can accurately judge the quality of the magnetic ring in the use process, and meanwhile, in the operation process, the magnetic ring cannot be influenced by a magnetic field.

The invention discloses a shaped beam directional antenna. The shaped beam directional antenna comprises an antenna array formed by arranging at least two patch antennas on a plane, a monopole array formed by arranging a plurality of monopole oscillators along the periphery of the antenna array, and a choke groove structure body formed by arranging at least two three-dimensional metal choke grooves at intervals outside a metal barrel-shaped antenna supporting structure body in a sleeving manner, wherein the heights of the three-dimensional metal choke grooves forming the choke groove structure body are sequentially reduced from inside to outside and are lower than the height of the antenna supporting structure body, the antenna array is installed at the top part of the antenna supporting structure body, the monopole array, the antenna array and the choke groove structure body are covered with a cover shell, and the cover shell is fixed to the three-dimensional metal choke groove in the outermost layer of the choke groove structure body. The shaped beam directional antenna is used for dual-band transceiving orientation of satellite navigation signals by a satellite navigation receiver, has the quality characteristics of dual circular polarization, high and low elevation gain and high phase center precision, is compact in structure, high in integration level and convenient to assemble and use, and can meet the application requirements of special scenes.