58results about How to "Insensitive to temperature changes" patented technology

The invention relates to the technical field of radar, in particular to a millimeter-wave quasi-optical integrated dielectric lens antenna and an array thereof. The array consists of a microstrip integrated antenna, a dielectric lens, an objective lens, an array base, a reflecting mirror, a protective cover and a beam transfer switch; one end face of the dielectric lens is a hemisphere or an ellipsoid, while the other end face is a cylindrical section; the microstrip integrated antenna is generated by an dielectric substrate, the front surface of the dielectric substrate is closely adhered tothe cylindrical section of the dielectric lens and serves as a feed source, and the back surface is grounded; the hemispherical or ellipsoidal end face of the dielectric lens is an antenna radiating surface; the length of the cylindrical part of the dielectric lens can be changed; the antenna array is arranged into a linear array or an area array; the array base and the reflecting mirror have conical quasi-optical reflecting mirror surfaces; the focus of the objective lens of the linear array or the area array aligns with the central line of the dielectric lens; the protective cover is arranged outside; and the antenna array is controlled by the beam transfer switch. The antenna structure has strong shock resistance and dust prevention, and is suitable for millimeter-wave radars for planes, automobiles and ships, and receiving/emitting sensing of communication equipment.

A tunable micro-lens and micro-lens array for use in optical communications are disclosed. The micro-lens uses thermo optical material and a temperature controller to adjust the temperature and, hence, the index of refraction of the thermo optical material. In one embodiment, a single temperature controller is used to maintain an array of micro-lenses at a desired temperature. In an alternate embodiment, the individual lenses in an array are separately tunable. The invention may be used with either 2D or 3D lenses, and is well suited for use with existing planar lightwave circuit (PLC) technology.

The invention relates to a SiGe bipolar complementary metal oxide semiconductor (BiCMOS) radio-frequency power amplifier. The amplifier comprises a first-stage pre-amplification transistor, a second-stage power amplification transistor, a first-stage biasing circuit, a second-stage biasing circuit, an input matching network and an impedance conversion network. The circuit structure of the invention consists of a first-stage pre-amplification circuit and a second-stage power amplification circuit which are connected with each other through a coupling capacitor. The first-stage pre-amplification transistor is a standard SiGe transistor, and the linearity of the circuit is enhanced by a remote control (RC) serial feedback circuit; and the second-stage power amplification transistor is a high-voltage SiGe transistor and can reach relatively high output power. Both the first biasing circuit and the second biasing circuit have bipolar transistor current mirror structures, and temperature stability is enhanced by temperature negative feedback technology. The amplifier has high linearity and relatively high output power.

The invention relates to an extra-large fiber reinforced plastic (FRP) combined storage tank structure with a floating roof, and a construction method of the storage tank structure. The extra-large FRP combined storage tank structure comprises a tank top, a tank wall and a tank bottom, wherein the tank top has an FRP latticed shell structure; FRP plates are laid on the FRP latticed shell structure; the tank wall is composed of an inner layer FRP plate, an outer layer FRP plate and active powder concrete between the inner layer FRP plate and the outer layer FRP plate; the floating roof is arranged in the tank cover; a connection piece is arranged between the inner layer FRP plate and the outer layer FRP plate; concrete trapezoid grooves are sequentially formed between the inner layer FRP plate and the outer layer FRP plate along a circumferential direction; prestress bars are pulled between every two adjacent concrete trapezoid grooves section by section; and the inner layer FRP plate and the outer layer FRP plate are formed by connecting FRP spliced plates through tenon tongues and tenon grooves. The extra-large FRP combined storage tank structure is high in corrosion resistance and freezing resistance, insensitive to temperature change, low in heat transmission speed, favorable for keeping temperature in a tank body, high in compression strength, high in corrosion resistance and relatively high anti-permeability.

The invention relates to a Breguet overcoil balance spring (1) that includes a hairspring (3) mounted in a single part, made of micro-machinable material, and coaxially with a collet (5). According to the invention, the balance spring has a terminal curve (7) made of micro-machinable material and an elevation device (9) made of micro-machinable material between the outer coil (15) of the hairspring and the terminal curve to improve the concentric development of the balance spring. The invention also relates to the method of manufacturing the balance spring. The invention concerns the field of timepiece making.

The invention relates to rare-earth modified asphalt and a preparation method thereof. The rare-earth compound modified asphalt is prepared from, by weight, 80-95 parts of matrix asphalt, 0.1-3 parts of rare-earth compounds and 4.9-20 parts of rock asphalt. The rare-earth compound modified asphalt has the advantages of being insensitive to temperature changes, free of cracks at low temperature and long in service life, resisting to tracks at high temperature, resisting to ageing, resisting to stripping and the like, the production process is simple, energy consumption is low, and cost is low. The modified asphalt has wide application prospects in building of roads and bridges.

The invention relates to a high-efficiency LD (Laser Diode) pumping frequency-doubling laser with wide temperature bandwidth. The high-efficiency LED pumping frequency-doubling laser comprises an LD pumping source, a coupling system and a laser resonant cavity; the laser resonant cavity comprises an input cavity lens, a laser crystal with wider absorption bandwidth, a frequency-doubling crystal with wider temperature receiving bandwidth, and an output cavity lens. Through the technical scheme above, the output of frequency-doubling laser, containing red light, green light or blue light, with a wide temperature band can be respectively realized by plating a specified film system on the laser resonant cavity lens and cutting the frequency-doubling crystal according to a relative phase matching angle.

The invention discloses an excitation power circuit of a rotary transformer, belongs to the field of drive power sources, and solves the problems of complex circuit and incapability of independently working in the traditional excitation power of the rotary transformer. The excitation power circuit consists of a sinusoidal oscillation circuit, an amplitude adjusting circuit and a power amplifying circuit, wherein the sinusoidal oscillation circuit consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor CSEL1, a capacitor CSEL2, a first operational amplifier and a second operational amplifier; the amplitude adjusting circuit consists of a resistor R6, a resistor R7, a resistor RSEL, a capacitor C3 and a third operational amplifier; and the power amplifying circuit comprises a resistor R8 and a power amplifier. The frequency of a sinusoidal excitation power source generated by the circuit of the invention is modulated by selecting a capacitance value of the capacitor CSEL1 and the capacitor CSEL2, and the amplitude value of the sinusoidal excitation power source is adjusted by changing the resistance value of the resistor RSEL. The excitation power circuit of the invention serves as the drive power source of the rotary transformer.

The invention provides a content detection method of gamithromycin. According to the technical scheme, the content of gamithromycin is detected by virtue of a HPLC method; an evaporative light-scattering detector is utilized, is high in sensitivity and is not sensitive to temperature variation, and a base line is relatively stable; the response of the evaporative light-scattering detector does not depend on the optical property of a sample, is not influenced by functional groups, is not interfered by a mobile phase and is in direct proportion to the quality of the sample, and specific chemical structures of detected main components are not required; the gamithromycin is relatively low in absorption wavelength and is absorbed at a tail end of an ultraviolet ray; therefore, compared with an ultraviolet detector, the evaporative light-scattering detector has great superiority in the detection of gamithromycin. Besides, selected chromatographic columns and chromatographic conditions are designed tightly around the characteristic of the evaporative light-scattering detector, a relatively good separation effect is integrally realized; after the method is verified by virtue of methods such as an accuracy experiment, a linear relation experiment and a sampling recycling experiment, results show that the accuracy is high, the detection range is wide, and the sensitivity is relatively good.

The invention discloses a light airplane aileron manipulating system. The light airplane aileron manipulating system comprises a left manipulating handle device, a right manipulating handle device, aleft aileron torsion bar, a right aileron torsion bar, an aileron synchronous rod, two same push-pull flexible shafts, two same space four-connecting-rod mechanisms, a left aileron and a right aileron, the two same push-pull flexible shafts are symmetrically arranged, and the two same space four-connecting-rod mechanisms are symmetrically arranged. A small connecting rod in the left manipulating handle device is connected with the left aileron torsion bar, the other end of the left aileron torsion bar is connected with the aileron synchronous rod, and flexible shaft connectors in the aileron synchronous rod are connected with the push-pull flexible shafts. The other ends of the push-pull flexible shafts are connected with the space four-connecting-rod mechanisms, deflection of the left aileron and the right aileron can be driven through the space four-connecting-rod mechanisms, and any one in the left manipulating handle device and the right manipulating handle device can control simultaneous reverse movement of the left aileron and the right aileron. According to the light airplane aileron manipulating system, the deflection angles of the ailerons are ensured at high accuracy.

The invention discloses a dynamically adjustable and controllable multimode interference coupler. The coupler comprises a coupler body. The coupler body comprises a supporting substrate, a coupler base body arranged on the supporting substrate, a plurality of input waveguides and a plurality of output waveguides, the input waveguides and the output waveguides are arranged on the coupler base body.And the coupler further comprises a dynamic regulation and control element used for regulating and controlling a refractive index of the coupler base body. Based on a MMI coupler, compared with an MZI array structure, the coupler has advantages that the coupler is simple in structure, and only one optical element (MMI) can achieve computing power which can be achieved by an array composed of dozens of MZIs; the coupler is insensitive to a temperature change and can be applied to occasions with the large temperature change; a bandwidth is wide, a design is more flexible, and applicability is stronger; and the coupler is insensitive to machining errors so that machining is simpler.

The invention discloses a method for preparing a non-ferrous metal surface treating agent and belongs to the field of metal surface treatment. The method comprises the preparation steps: (a) weighing and mixing sodium polyacrylate, sodium pyrophosphate, carboxymethyl cellulose and sodium dodecyl sulfonate, adding deionized water, uniformly stirring, heating to the temperature of 45 DEG C while stirring, and carrying out heat preservation for 30 minutes, so as to obtain a solution; (b) cooling the solution obtained in the step (a) to the temperature of 25 DEG C, adding chitosan and alumina, and stirring for 20 minutes, so as to obtain a solution; (c) adding acetic acid and triethanolamine into the solution obtained in the step (b), and uniformly stirring, thereby obtaining the non-ferrous metal surface treating agent. Through treating the surface of metal by using the non-ferrous metal surface treating agent, the metal can be effectively prevented from oxidation and corrosion, and the surface of the metal can be kept bright; the non-ferrous metal surface treating agent is pollution-free to environment, is degradable, is low in cost and safe in use, and is beneficial to very good popularization.

The invention discloses a common-mode inductor applying a high-stability ultra-crystalline magnetic core and a manufacturing method of the common-mode inductor. The ultra-crystalline magnetic core with high stability is obtained through controlling vacuum electro-slag remelting, single-roll chilling, molding, ultra-crystallization and distressing processing of the ultra-crystalline magnetic core; and the stability of the common-mode inductor disclosed by the invention is improved through a gap filler which is formed by mixing an aluminum nitride based ceramic framework with excellent electromagnetic performance, a fully enclosed aluminum alloy shielding case and silicone rubber with glass fibers according to a weight ratio of 9: 1. The common-mode inductor applying the high-stability ultra-crystalline magnetic core is high in stability, insensitive to temperature, long in service life, good in electromagnetic shielding performance and excellent in heat dissipation performance.

The invention discloses a small-area reference circuit in the Internet of Things. The reference circuit comprises a staring circuit, a power supply independent biasing circuit and a core reference circuit, wherein the starting circuit is used for completing the starting of the reference circuit and avoiding an undesired zero current state; the power supply independent biasing circuit is used for generating current reference with a positive temperature coefficient; the core reference circuit is inclinedly arranged in the subthreshold area and generates core reference current and reference voltage, and the accuracy of the generated reference voltage is higher. According to the small-area reference circuit, all MOS tubes adopt strengthening-type MOS tubes, the strengthening-type MOS tubes arenot sensitive to temperature changes, energy consumption is lower, and as a result of the subthreshold state of MOSFET, high tolerance to power and technology changes is achieved.

The invention relates to an air film cooling platelet injector. The air film cooling platelet injector comprises an injector body, wherein a fuel flow channel which communicates with a fuel supply source and an oxidant flow channel which communicates with an oxidant supply source are formed in the injector body; the fuel flow channel comprises a fuel inlet channel, a radial fuel shunting chamber and a plurality of fuel shunting channels which communicate with each other in sequence, and the plurality of fuel shunting channels are circumferentially distributed along the central axis of the fuelshunting chamber; and the oxidant flow channel comprises an oxidant inlet channel, an oxidant turning cavity, a radial oxidant shunting chamber and a plurality of oxidant shunting channels which communicate with each other in sequence, the central axis of the fuel shunting chamber coincides with that of the oxidant shunting chamber, and the plurality of oxidant shunting channels are circumferentially distributed along the central axis of the oxidant shunting chamber. According to the air film cooling platelet injector, a combustion chamber body and an injector panel are cooled by adopting anair film cooling method, so that the service life of the injector and an engine can be prolonged.