307results about How to "Reduce temperature sensitivity" patented technology

A lower-cost and more precise control methodology of regulating the output current of a Flyback converter from the primary side is provided. The methodology regulates the output current accurately in both continuous current mode (CCM) and discontinuous mode (DCM) and can be applied to most small, medium, and high power applications such as cell phone chargers, power management in desktop computers and networking equipment, and, generally, to a wide spectrum of power management applications. Two highly integrated semiconductor chips based on this control methodology are also described that require very few components to build a constant current Flyback converter.

A lower-cost and more precise control methodology of regulating the output current of a Flyback converter from the primary side is provided, which works accurately in both continuous current mode (CCM) and discontinuous mode (DCM), and can be applied to most small, medium and high power applications such cell phone chargers, power management in desktop computers and networking equipment, and, generally, to a wide spectrum of power management applications. Two highly integrated semiconductor chips based on this control methodology are also described that require very few components to build a constant current Flyback converter.

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.

A method for controlling fuel injection of a direct injection fuel system, the fuel system having a fuel pump, the method comprising: variably operating the fuel pump to maintain a fuel pressure at a selected pressure, temporarily increasing pump operation to increase pressure sufficiently above said selected pressure and then reducing pump operation; during at least a fuel injection subsequent to the reduction in pump operation, correlating pressure decrease to injector operation, and adjusting fuel injection operation based on the correlation.

A method and device for the treatment of atrial fibrillation by inhibiting the flow of electricity from the pulmonary vein to the left atrium. The method includes inhibiting electrical flow by disabling the conductive fibers mechanically, using an incision (70), or via fibrosis, or chemically by applying toxic substances to the fibers. In one embodiment, a device (30) is useable to deliver a prosthetic structure (10) to the pulmonary vein that is useable to stretch the pulmonary vein, thereby inducing fibrosis, keeping the incision (70) open, or delivering a substance to the endothelium of the pulmonary vein. The structure (10) delivered by the device (30) is a self-expanding prosthetic structure. In another embodiment, a device (60) is useable to deliver and expand a prosthetic structure (10) that is expandable but not self-expanding.

The invention relates to a preparation method for phase-change asphalt pavement material and is characterized in that the method comprises the following steps: (1), the preparation of phase-change asphalt modifier: firstly, selecting the materials based on the mass ratio among phase change material, coagulant, support material and coupling agent which is equal to 100:1-5:10-50:1-5; secondly, adding the phase change material into the silica sol, and then adding the coagulant dropwise to form gel; drying the gel, cooling the gel to room temperature and then taking out and mashing the gel to get powder through mixing; vacuuming the powder at 30-50 DEG C for 2-4 hours, then adding the support material under the protection of shielding gas; at 80-100 DEG C, adding the coupling agent for hydrophobic modification; then granulating to get the phase-change asphalt modifier; (2), the preparation of phase-change asphalt pavement material: firstly, selecting the materials based on the mass ratio among coarse aggregate: fine aggregate: filler, asphalt, fiber and phase change asphalt modifier which is equal to 100:10-20:1-8:2-6:0.2-0.5:2-10; then stirring the materials to get the phase-change asphalt pavement material. The phase-change asphalt pavement material prepared through the invention can improve the high temperature stability of pavement surface.

A method for controlling fuel injection of a direct injection fuel system, the fuel system having a fuel pump, the method comprising: variably operating the fuel pump to maintain a fuel pressure at a selected pressure, temporarily increasing pump operation to increase pressure sufficiently above said selected pressure and then reducing pump operation; during at least a fuel injection subsequent to the reduction in pump operation, correlating pressure decrease to injector operation, and adjusting fuel injection operation based on the correlation.

The invention belongs to the field of construction materials and particularly relates to novel foam high-polymer composite and a production method. The novel foam high-polymer composite comprises 10-90 parts of thermoplastic plastics, 0.5-3 parts of plasticizer, 0.5-3 parts of flexibilizer, 0.5-3 parts of tackifier, 0.3-2 parts of internal and external lubricant, 0.5-3 parts of stabilizer, 0.5-5 parts of crosslinking modifier, 0.5-12 parts of regulator, 0.5-5 parts of foaming agent, 0.5-3 parts of filler, 0-20 parts of flame retardant, 10-90 parts of inorganic powder and pigment in proper quantity. The novel foam high-polymer composite in the technical scheme is energy-saving, emission-reducing, acid-resistant and alkali-resistant, weak in temperature sensitivity and excellent in physical and chemical performance.

The invention discloses a piezoelectric disc micromechanical gyroscope which comprises a disc harmonic oscillator with a supporting column, three driving electrodes, three detecting electrodes, three monitoring electrodes and three balancing electrodes. The three driving electrodes, the three detecting electrodes, the three monitoring electrodes and the three balancing electrodes are distributed along a circle of the end face of the disc harmonic oscillator respectively. The piezoelectric disc micromechanical gyroscope utilizes a special vibration mode of the disc harmonic oscillator to work, alternating current voltage is applied to the three driving electrodes on the disc harmonic oscillator, and the disc harmonic oscillator vibrates in a driving mode due to inverse piezoelectric effect. When input angular velocity exists, a vibration mode of the disc harmonic oscillator is turned to a detecting mode. By means of sensitive signals generated through piezoelectric positive effect at detecting electrode positions, the input angular velocity is obtained after the sensitive signals are processed through a peripheral circuit. The piezoelectric disc micromechanical gyroscope has the advantages of being simple in structure and small in size, having high Q value and the like and does not need vacuum packaging.

The invention provides emulsified asphalt for a ballastless slab track in a severe cold region and a preparation method thereof. The emulsified asphalt comprises the following ingredients by mass portion: 55-65 portions of matrix asphalt or modified asphalt, 35-45 portions of water, 0.1-1.0 portion of stabilizer, 0-1.0 portion of thickening agent, 0-2.0 portions of pH regulator, 0.1-1.5 portions of interfacial modifier, 0.6-1.8 portions of cationic emulsifier, 0.4-1.2 portions of non-ionic emulsifier, 0-1.0 portion of optional amphoteric ionic emulsifier and 0-0.6 portion of mineral emulsifier, wherein the emulsifier amounts to 1.0-4.0 portions. The emulsified asphalt has the advantages of high stability, good thermal adaptability, wide material adaptability, strong adhesive force with aggregate and the like, does not significantly influence the hydration of cement after the emulsified asphalt is mixed with the cement and sand, and is suitable for the ballastless slab track, particularly the ballastless slab tracks of CRTSI type high speed railways, passenger transport lines and interurban railways in the severe cold region.

A current sensor is provided that employs a primary winding that carries the current to be measured, and a secondary winding that controls the flux inside the magnetic core, provides a sample of the primary current, and also helps to control the flux at small primary currents and to saturate the transformer. An auxiliary winding is optionally used to control the flux in order to simplify control of the sensor. By periodically applying a certain voltage at the secondary winding, the transformer core is forced out of saturation, and a sample of the primary current is taken by a sensing circuit that may include a sample-and-hold circuit and an analog-to-digital converter. A control circuit is employed to control the currents flowing in the secondary winding and optional auxiliary winding and to manage the sensing circuit.

The invention relates to an anti-rut asphalt additive, a method for preparing the same and a method for using the same. Polyethylene resin and polypropylene resin are adopted for using simultaneously; and through the use of liquation, cutting, mixing and extrusion pelletization technology at high temperature, compatibility between the materials is improved so as to further improve high-temperature stability of an asphalt surface layer. In order to reduce material cost, waste polyethylene resin and waste polypropylene resin can also be used so as to achieve the aims of reducing cost, realizing recycling of waste and reducing environmental pollution simultaneously.

The invention supplies a method to make phyllo-silicate clay nm modification asphalt that is made up of 0.1-20% of phyllo-silicate clay and 80-99.9% of asphalt. The process includes the following steps: using the phyllo-silicate clay as modification agent for road petroleum asphalt; adding the clay into asphalt maintaining the temperature between 100 degree centigrade and 200 degree centigrade, whisking for 0.5-8 hours at the rotating speed between 1000-6000rpm / min and the modification asphalt would be gained. The invention has simple technology and has high price performance ratio.

The invention discloses a triaxial integrated optical fiber gyroscope inert measurement device based on optical source cold standby, and a compensation and installation method. The triaxial integrated optical fiber gyroscope inert measurement device comprises a body, two triaxial shared optical sources, an optical source driving and refrigerating circuit, three framework-free optical fiber loop meter heads, three optical fiber gyroscope signal processing and interference circuit digital boards, a system signal processing and interface circuit digital plate, a secondary power supply module, a frequency and voltage conversion simulation circuit, three electric connectors and a reference mirror. The three optical fiber loops share an optical source, and a standby cold optical source is provided, thus the reliability is high; the installation error correction method used by the invention can effectively reduce the triaxial cross coupling; the circuit boards are installed on a lateral cover and an upper cover for the convenience of radiation protection design; meanwhile, the favorable heat radiation is realized; framework-free optical fiber loops are used, the adaptability of a magnetic environment and a radiation environment is improved.

The invention discloses a natural plant oil based hydrophile low-resilience foam which is prepared from a composite and isocyanate, wherein the composite comprises the following components of 100 parts of pluronic polyols, 0-8 parts of cross-linking agent or chain extender, 0-3 parts of catalyst, 0-4 parts of foam stabilizing agent, 0.2-10 parts of foaming agent, 0-5 parts of interface activating agent and 60-100 parts of isocyanate index. A preparation method comprises the steps of: firstly, stirring uniformly the composite, and then adding the isocyanate according to the proportion; secondly, foaming in a die in a closed state to obtain molding foam, or freely foaming in a foaming tank; and cutting to obtain blocky foam after ageing. The regenerable natural plant oil polyalcohol is used in the invention and can be used in various isocyanate systems, and a metal catalyst can not be completely used, therefore, the environment is protected; and 100 parts of isocyanate index can be used, therefore, slow resilience effect and low residue are obtained. The low-resilience foam produced in the invention has the advantages of environment protection, high ventilation, better thermal diffusion and comfort and low temperature sensitivity.

The present invention provides a secondarily-curable polyurethane modified epoxy asphalt mixture which is prepared by mixing 2-8 parts by mass of polyurethane modified epoxy asphalt with 92-98 parts by mass of mineral aggregates; the polyurethane modified epoxy asphalt consists of a component A, a component B, and a component C, wherein the component A is 100 parts of polyurethane modified epoxy resin; the component B consists of the following substances in parts by mass: 70-150 parts of a curing agent and 0-0.02 parts of an accelerator; and the component C is 50-200 parts of asphalt. The secondarily-curable polyurethane modified epoxy asphalt mixture provided by the present invention is suitable for paving a steel bridge deck and a cement concrete bridge deck and paving and repairing an asphalt pavement, and is used for special road sections such as an intersection and a bus stop.

The invention discloses a fiber-optic gyroscope based on a single-mode single polarized photon crystal optical fiber. A broadband optical fiber light source emits polarized light; the polarized light enters a polarization-maintaining optical fiber coupler via a polarization-maintaining optical fiber; the polarized light is divided into two beams, wherein one beam enters a hollow head to be attenuated, and the other beam enters an optical phase modulator via a polarization-maintaining optical fiber; the light is divided into two beams by the optical phase modulator; the two beams of light are respectively output to two ends of a optical fiber sensitive ring via a single-mode single-polarization photonic crystal tail fiber in the optical phase modulator; the optical fiber sensitive ring is wound by a single-mode single-polarization photonic crystal optical fiber; the two beams of light are respectively spread clockwise and anticlockwise in the optical fiber sensitive ring; output light is returned back to the optical phase modulator to generate interference; interference light enters the polarization-maintaining optical fiber coupler to obtain an interference signal; and an optical detector detects the interference signal to obtain the rotation speed of the measurement system. According to the fiber-optic gyroscope disclosed by the invention, the polarization error of the fiber-optic gyroscope can be effectively reduced, the null shift of the fiber-optic gyroscope is reduced, and the mechanical performance and the temperature performance of the fiber-optic gyroscope are improved.

The invention discloses an ellipse core panda type polarization maintaining optical fiber and a manufacturing method thereof. The polarization maintaining optical fiber comprises a fiber core, stress areas, cladding and an outer coating. The cross section of the fiber core is oval, the fiber core is arranged in the centre of the cladding, the position of the central point of the cross section of the fiber core coincides with the position of the central point of the cross section of the optical fiber, the two stress areas are symmetrically distributed on the two sides of the fiber core in the long axis direction and arranged in the cladding, and the outer coating is arranged on the outer side of the cladding. The manufacturing method comprises the steps that a core rod is prepared through a CVD method, and a core rod with the large core diameter and the high numerical aperture is prepare; the core rod is subjected to flat grinding and stretching the core rod is finished into an ellipse core rod, a hole is formed in the long axis direction, and finishing is carried out in the short axis direction; two stress rods are prepared; an optical fiber preform is formed through the core rod, the stress rods and the pure silicon cladding, and finally RIT wire drawing is carried out on the optical fiber preform, and the ellipse core panda type polarization maintaining optical fiber is manufactured. The optical fiber is low in loss, high in double refraction performance and good in temperature performance, and grinding performance is improved while polarization performance is kept.

Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and a thermal treatment process thereof. The thermal treatment includes steps of performing solution treatment to Ti-Al-Zr-Mo-Cr-series beta titanium alloy and then performing aging treatment. The Ti-Al-Zr-Mo-Cr-series beta titanium alloy includes, by weight, 4.5-5.5% of Al, 3.5-4.5% of Zr, 9.5-10.5% of Mo, and 2.5-3.5% of Cr, the balanced being Ti. The alloy, after smelting, forging and toughening thermal treatment, has ultrahigh strength and plasticity. The alloy includes aluminum and also a certain amount of a neutral element, zirconium, so that alpha-phase is further reinforced; by adding the molybdenum at high mass percentage, a beta-matrix is reinforced; in addition, due to the low diffusion rate of molybdenum, temperaturesensitivity of the alloy in a two-phase zone during forging is reduced, thus enlarging processing window of the alloy.

The invention provides a relaxation oscillator. The relaxation oscillator comprises a biasing circuit, an oscillation circuit and a clock generation circuit, wherein the biasing circuit is used for producing biasing current and providing charging current for the oscillation circuit through the biasing current; the oscillation circuit is connected with the biasing circuit and is used for integrating the charging current by using a capacitor so as to produce integrator voltage; reset pulse is produced according to the integrator voltage and is input into the clock generation circuit; the clock generation circuit is connected with the oscillation circuit and is used for producing a clock signal through the reset pulse and controlling the switching of a switch in the oscillation circuit through the clock signal, so that the oscillation circuit can alternately charge or discharge. According to the relaxation oscillator, the frequency stability of the relaxation oscillator can be improved.

Optical integrated circuits are disclosed having a gap (18) traversing the lens or the waveguide grating and an actuator (12) that controllably positions the optical integrated circuit on each side of the gap (18). As a result, the thermal sensitivity of the optical integrated circuits, for example, arrayed waveguide gratings, is mitigated. Also disclosed are methods for fabricating optical integrated circuits employing the gap (18) and the actuator (12).

The invention discloses a production process of rock asphalt modified asphalt and a production process of a rock asphalt modified asphalt mixture. The production process of rock asphalt modified asphalt comprises the following process steps of: placing matrix asphalt in an asphalt tank with a stirring device to heat to about 160 DEG C, and starting the stirring device; then slowly adding a part of rock asphalt and a stabilizer under stirring, heating to about 175 DEG C, and stirring for 30 minutes at the temperature; adding the rest asphalt to continuously stir for 1-1.5 hours to ensure that asphalt particles are dissolved completely; and moving the prepared rock asphalt modified asphalt in a finished product storage tank, and properly stirring in the storage process. When in use, mineral aggregate is heated and controlled to about 185 DEG C; the rock asphalt modified asphalt is added in the mineral aggregate to stir, and the temperature is controlled to about 175 DEG C to obtain the mixture; and the mixture is discharged when the temperature is reduced to 170 DEG C. By adopting the process to prepare the rock asphalt modified asphalt, the operations are simple and rock asphalt can be distributed in the matrix asphalt evenly.

The invention provides a semi-flexible base material and a production method thereof, which belong to the technical field of modification and emulsification engineering, and comprises the following components by weight percent: 90-95% of aggregate, 3-8% of cement and 2-16% of SBS modified and emulsified asphalt. The production method comprises the following steps of: after firstly dry mixing the cement and stones uniformly, adding water and SBS modified and emulsified asphalt to stir, and after uniform mixing, obtaining the semi-flexible base material. The invention is better than rigid base material and flexible base material, compound produced by the using the semi-flexible base material has good permanent deformation resistance, improves the initial strength of semi-rigid base material and shortens the time for forming the strength, simultaneously increases the flexibility through adding emulsified asphalt, takes the advantage of asphalt and cement base stabilizing performance to make up the shortage, has appropriate rigidity, higher strength, smaller temperature sensitivity and better low temperature crack resistance, and decreases and prevents the base from cracking, and thereby preventing roads from reflection crack, playing good road use performance, and prolonging the service lives of the roads.

The embodiment of the invention discloses a user load short-term prediction method and device, and the method comprises the steps: carrying out the classification of users, and dividing the users intofour types: good power utilization stability, poor power utilization stability, low temperature sensitivity and high temperature sensitivity according to the power utilization stability and temperature sensitivity of the users; predicting the four types of users by adopting a plurality of prediction models, and selecting the prediction model with the highest efficiency as a main prediction modelof the current type of users; and respectively carrying out load short-term prediction on the four types of users by adopting the corresponding main prediction models. According to the method, user classification is carried out according to user power utilization characteristics. Then, a load prediction algorithm is selected adapting to the user characteristics to predict. The situation that the prediction precision is reduced when a single load prediction method is applied to users with different characteristics is avoided. The method has the advantage of being high in prediction speed, and the problem that high-precision and high-speed prediction results are difficult to guarantee simultaneously for a large number of user loads in the current load prediction field is solved.

The invention discloses an organic montmorillonite modified epoxy asphalt material and a preparation method thereof. The epoxy asphalt material comprises components A and B in a mass ratio of (3.6-6.0) to 1, wherein the component A comprises the following substances in parts by mass: 100 parts of matrix asphalt, 10-20 parts of an anhydride curing agent, 25-42 parts of aliphatic dicarboxylic acid, 10-30 parts of an epoxy asphalt compatilizer, 0.3-1.0 part of a curing accelerator and 0-6 parts of organic montmorillonite; the component B is epoxy resin. The material disclosed by the invention has a good high-low temperature mechanical performance, and organic montmorillonite can be used for enhancing the strength of the epoxy asphalt material and improving the high-temperature stability and anti-aging performance of the epoxy asphalt material. The material disclosed by the invention can be used for paving materials of roads and bridges and used for steel bridge panels, expressways and airfield runways and the like.

The invention provides a constant-speed cooling medium with an extremely-stable cooling property, which is characterized in that the constant-speed cooling medium is an aqueous solution of high molecular polymers, the aqueous solution of the high molecular polymers comprises 5-15% of polyvinylpyrrolidone (PVP), 3-8% sodium carboxymethylcellulose (CMC) and 0-3% of sodium polyacrylate (ACR) and further comprises 3-8% of a defoamer, a rust inhibitor and a microbicide, and water in balancing amount. When a forged product is cooled in the constant-speed cooling medium, the cooling process of the surface and the core of the product can be coordinated, so as to effectively control the problem of secondary segregation after forging and solve the problems such as thick and big core structure to prepare for the subsequent heat treatment. Besides, the constant-speed cooling medium has the characteristics of cleanness, environmental friendliness and no pollution, improves the operational environment of a production site and ensures safe production. The conventional extensive cooling mode is replaced, the energy consumption is reduced, and the cost input of related auxiliary equipment is reduced.

The invention discloses and relates to an ecological sand plastic composite composition, a method for preparing the ecological sand plastic composite, and a prepared material. The composition comprises aeolian sand, a resin and flyash; 100 parts by weight of aeolian sand is taken as a standard, the content of flyash is 12-80 parts by weight, and the content of the resin is 12-80 parts by weight. The disclosed ecological sand plastic composite is chemical in physical and chemical properties, is non-toxic and tasteless, is low in temperature sensitivity, produces wood texture after the surface treatment, is high in biofidelity, can completely or partially replace the conventional wood plastic composite profile and log, and has the properties of secondary processing of sawing, nailing, cutting or fixing through a screw, and a leftover material or a waste product can be recycled, broken, extruded again and set to manufacture a profile product.