123results about How to "Fast stabilization" patented technology

An implantable medical device for treating the back of a patient. Stimulation energy is delivered to muscles or joint capsules or ligaments or nerve fibers to improve the heath of the back.

An expandable stent is provided, wherein the stent is advantageously formed of at least one amorphous metal alloy and a biocompatible material. The stent is formed from flat metal in a helical strip which is wound to form a tubular structure. The tubular structure is not welded but rather is wrapped or coated with a biocompatible material in order to maintain the amorphous metal in its tubular configuration. Said stent can be balloon expanded or self expanding.

The invention relates to a reductive degradable stabilizer for heavy metal and/or organic matter polluted soil as well as a preparation method and use of the stabilizer. The reductive degradable stabilizer can be used for quickly and efficiently stabilizing the heavy metals and the organic matters in the polluted soil by virtue of a synergistic effect of a plurality of active ingredients, and can also be used for further lowering the content of the organic matters, so that the purpose of lowering leaching toxicity of pollutants and health risk is realized; therefore, the reductive degradable stabilizer is a novel and efficient stabilizer which has the advantages of being wide in treatment substrate, capable of reducing the total amount of the organic matters, good in stabilizing effect, convenient to operate and the like, and has a wide range of application in the governance fields including polluted soil, bottom mud, sludge and the like.

A nano-crystalline composite-oxide thin film for an environmental gas sensor, an environmental gas sensor using the thin film, and a method of manufacturing the environmental gas sensor are provided. The nano-crystalline composite-oxide thin film is formed of hetero-oxide nano-crystalline particles having independent crystalline phases from each other, and the environmental gas sensor including the thin film has excellent characteristics including high sensitivity, high selectivity, high stability and low power consumption.

A high thermal change rate of test apparatus aims to realize test equipment requirement of highly accelerated life test(HALT) and highly accelerated stress screening(HASS). Structurally, the apparatus is provided with a cabinet body with an interior for placing test specimen. The cabinet body is provided with elements of fans, electric heating tubes and liquid nitrogen nozzles therein. The positions of the cabinet body and the control system are separate. Several groups (normally 2 or 3 groups, depends on the size of cabinet) of liquid nitrogen pipes connecting the cabinet body are flexible stainless steel pipes for enclosing and insulating sleeve tubes. During full-speed temperature cooling, all groups of the pipes simultaneously eject liquid nitrogen. When temperature is constant, only one group of liquid nitrogen pipe with cryogenic valve and nozzles is used and micro-adjusted to achieve good temperature stability. The cabinet body can match different types of shaker combinations to perform temperature/vibration test with high transition rate of temperature, and be used as a single high thermal change rate of temperature cabinet, can have relatively great assembly flexibility in response to test requirement. The entire apparatus has higher mobility and flexibility than conventional temperature/vibration cabinets.

The present invention discloses one kind of fast restoring low voltage drop linear voltage stabilizer. The linear voltage stabilizer has one current detecting circuit to detect the output current, compares the output current with some reference current, and regulates the bias current of the second stage of amplifier dynamically. The linear voltage stabilizer has stable system damping coefficient greater than 1 in the case of high current output and fast restoring and stabilizing of the output voltage in the case of great change of output current.

A capsule type curing agent which comprises a core containing an amine type curing agent (A) and a capsule and a membrane covering said core, wherein said capsule membrane has a bonding group (x) absorbing infrared ray of a wave-number of 1630 to 1680 cm⁻¹ and/or a bonding group (y) absorbing infrared ray of a wave-number of 1680 to 1725 cm⁻¹, and contains cured material of an epoxy resin by the amine type curing agent (A) as a curing agent, and weight ratio of the core and the capsule membrane is 100:1 to 100:100.

A polymer electrolyte which comprises an ionic liquid (A) and a block copolymer (B) as essential ingredients, which block copolymer (B) comprises one or more of polymer block(s) (P) being compatible with (A) and one or more of polymer block(s) (Q) being incompatible with (A). (A) and (P) mutually dissolve each other to form one phase (X), and (Q) forms a phase (Y) being incompatible with phase (X), and phase (X) and phase (Y) are mutually micro phase separated. The polymer electrolyte of the present invention shows practical ion conductivity, is excellent in retention of ionic liquid, and moreover, is also excellent in heat resistance and mechanical strength. Furthermore, the electrochemical device and actuator element of the invention are swiftly displaced in accordance with application of a voltage, and can be actuated stably for a long period due to the liquid-retaining property and mechanical strength of the polymer electrolyte used, and, therefore, can suitably be used in the fields of medical instruments, micro-machines, industrial robot, personal robot, etc.

A toner is formed of toner particles each comprising at least a binder resin, a colorant and a wax, and inorganic fine powder. The toner is characterized by (a) containing a sulfur-containing polymer, and (b) showing dielectric loss tangent (tandelta) values at 100 kHz assuming a maximum of 2.5x10-2 to 8x10-2 in a temperature range of 100 to 130° C. Because of the combination of the features (a) and (b), the toner can exhibit a good combination of developing performances and fixing performances.

The present invention provides a fire extinguishing composition which is superior in rapid fire extinguishing performance, flame resistance, fuel resistance, re-ignition preventive performance and dilution stability to a conventional fire extinguishing composition against both fires of non-polar solvents and fires of polar solvents. This fire extinguishing composition contains a cationic polyamine-based polymeric compound (A), and the viscosity at 25° C. of an aqueous solution containing 50% by weight of the cationic polyamine-based polymeric compound (A) is from 10,000 to 30,000 mPa.s.

The invention provides a carrier tracking system of a GPS coarse/acquisition code signal and a method thereof. The system comprises an input signal, a loop circuit, a frequency discriminator in the loop circuit, a phase discriminator, a loop circuit filter and a numerical controlled oscillator (NCO), wherein the loop circuit is used for processing the input signal, and is combined by a frequency locked loop and a phase locked loop; the loop filter filters the output of the phase discriminator and phase discriminator; the numerical controlled oscillator (NCO) is connected with the output of the loop circuit filter. The system combines the frequency locked loop and the phase locked loop, when a frequency error is larger, the frequency locked loop plays the major role to be favorable for improving the bandwidth of a tracked loop, so that phase locking can be more easily; when the frequency error is smaller, the phase locked loop dominates to make the loop bandwidth smaller, so as to reduce noise influence and improve tracking precision.

The invention provides an inverted pendulum non-linear controller design method, which belongs to the technical field of nonlinear control. According to the non-linear controller design method, a step controller design method is applied to the problem of inverted pendulum control, so that the whole performance of the controller is improved. The method is characterized by establishing a nonlinear model of an inverted pendulum system, designing a steady-state controller and designing a reference dynamic feedforward controller; designing a feedback controller: designing the feedback controller through a Lyapunov method for a closed-loop error system of an inverted pendulum; and finally, obtaining control laws of the whole system controller. The method not only solves the problem of limitation of a linear controller in a high-nonlinearity and complex-model multivariable system of the inverted pendulum, but also solves the problem that it is hard for intelligence algorithms of a cloud model and a neural network and the like to realize in the application process.

The invention relates to a passive control method for an MMC under unbalanced grid voltage, which comprises the steps of S1, respectively building an AC-side mathematical model and a DC-side mathematical model of the MMC based on the Kirchhoff law according to a topological structure of the MMC; S2, transforming the AC-side mathematical model of the MMC into an AC-side mathematical model under a dq two-phase rotating coordinate system according to a coordinate transformation theory; S3, building an EL model of the MMC under a condition that the grid voltage is unbalanced; S4, performing passivity judgment on the MMC under the balanced grid voltage, and adopting passive control on the MMC if the MMC is strictly passive; and S5, designing a positive and negative sequence passive controller for the MMC requiring passive control according to the EL model acquired in the step S3. Compared with the prior art, the passive control method has the advantages of no power fluctuation, high steadyspeed, good control effect and the like.

The invention discloses a control method and system for realizing polarization stability, and belongs to the technical field of optical fiber communication and optical fiber sensing. According to thecontrol method and system of the invention, the output light polarization state of any input light polarization state after passing through a polarization controller is rapidly adjusted to be close toany specified target polarization state on a Poincare sphere through a rapid positioning algorithm, and then the output light polarization state is further stabilized to a target polarization state through a random gradient descent algorithm. Therefore, any polarization state can be stabilized to any set target polarization state. The specific implementation system is composed of an input end polarization analyzer, an output end polarization analyzer, a calibrated polarization controller, a single-chip microcomputer and the like; the input polarization analyzer and the polarization controllerwith the calibrated phase difference and voltage relation are used for rapid positioning, and meanwhile, the output polarization analyzer is combined with the stochastic gradient descent algorithm tofinally stabilize the output polarization state to a set value. According to the polarization stability control method, the searching speed and the local extreme value avoidance are balanced, and thepolarization state can be rapidly and stably changed to any designated target polarization state.

A control circuit for controlling a hysteretic regulator to operate at substantially fixed frequency has a voltage offset circuit which receives a first feedback signal and generates a pair of upper and lower offset voltages; a control reference stage which receives a reference voltage and the upper and lower offset voltages and outputs upper and lower control reference voltages; and a window comparator which receives the upper and lower control reference voltages and an output voltage feedback signal and outputs a pair of upper and lower control voltages for controlling switching of the hysteretic regulator at a fixed frequency. The first feedback signal may be representative of a switching frequency, a temperature or an output voltage of the hysteretic regulator, for example. The voltage offset circuit may further receive a second and/or an additional feedback signal. The first, second and/or additional feedback signals further may be weighted. According to particularly useful embodiments of the invention, the control method for a hysteretic regulator may use both output voltage and switching frequency as primary feedback signals, thereby allowing the window limits (control voltages) to be positioned completely independently and in any possible configuration about the nominal voltage. In other words, the two window limits can be positioned symmetrically or asymmetrically about the nominal voltage, and at the same time the lower window limit can be positioned either below, above, or equal to the upper window limit.

The invention discloses a multi-objective fractional-order PID control method for a DC buck converter. The method comprises the following steps: firstly, multiplying the error time between an actual output voltage and a reference voltage of the DC buck converter by an absolute error integral, an actual output voltage overshoot, and an settling time as three optimization objective functions; then,designing an efficient multi-objective differential evolution solver to obtain an optimal control parameter of the fractional-order PID control method offline; and finally, inputting the optimal control parameter into an actual digital processing signal processor to realize a real-time control of an output voltage of an actual DC buck converter. Compared with the prior art, the multi-objective fractional-order PID control method for the DC buck converter can automatically obtain the optimal control parameter of the DC buck converter by means of computer-aided design technology; and the actualoutput voltage of the DC buck converter has smaller overshoot and moire, faster stabilization speed, and better robust performance.

The invention discloses an additive applied to polluted soil. The additive comprises, in parts by mass, 30-40 parts of a clay mineral, 20-30 parts of a supporting type clay mineral, 12-13 parts of a molecular sieve ore, 6-8 parts of apatite, 4-9 parts of an iron oxide, 6-9 parts of a gel material, 3-6 parts of an activator, 6-15 parts of a reducing degradation agent and 1-6 parts of an auxiliary material. The additive can stabilize heavy metals and organic matters in the soil quickly and efficiently under the synergistic action of various effective components and can further decrease the content of the organic matters, so that the leaching toxicity of pollutants is reduced, the risk is reduced, and the additive has the broad application prospect in the field of treatment of the polluted soil and the like.

A sodium electrochemical cell that supports a current density at the negative electrode of at least 500 μA/cm², the electrochemical cell comprising (i) a negative electrode and (ii) a sodium-ion ionic liquid electrolyte having a sodium-ion concentration that is no less than 75% of its saturation limit in the electrolyte, wherein the negative electrode has a solid-electrolyte interphase (SEI) layer formed as a result of the electrochemical cell having undergone a polarisation cycle.

The invention is directed to a blood bag system, comprising a closed, sterile bag of substantially transparent, bio-compatible material, defining upper and lower ends; an infusion port at the upper end of the bag; an outlet port at the lower end of the bag; an inlet port at the lower end of the bag; a hemo-concentrator having an inlet port and an outlet port; a pair of inlet tubes fluidly connected to the hemo-concentrator inlet port; and a pair of outlet tubes fluidly connected to the hemo-concentrator outlet port. One of the inlet tubes is fluidly connected to the outlet port of the bag, and one of the outlet tubes fluidly connected to the inlet port of the bag. The other of the inlet tubes and the other of the outlet tubes are temporarily sealed (e.g., clamped) to prevent flow therethrough. The bag, the one outlet tube, the hemo-concentrator, and the one inlet tube thus form a closed fluid circulation circuit by which a pump can recycle the blood through the hemo-concentrator. One aspect of the invention includes a hemo-concentrator system and a specially adapted tubing set, for easily and quickly converting the hemo-concentrator from conventional use to use in the blood recovery method. Other aspects of the invention are directed to the combination of tubing set with hemo-concentrator, and to the tubing set itself.

The invention relates to a flatness control method for a modular multilevel matrix converter. The method comprises the following steps of 1) establishing a corresponding M3C mathematical model according to an M3C circuit topological structure; 2) performing double alpha beta 0 transformation on the mathematical model to obtain an M3C decoupling model comprising an input side decoupling model, an output side decoupling model, a bridge arm capacitor voltage and loop current decoupling model and a common mode voltage decoupling model; 3) performing dq conversion on the input side decoupling model, and constructing an input side flatness control strategy based on the feedforward reference control quantity and the error feedback compensation quantity; and 4) carrying out PI control on the output side decoupling model, the bridge arm capacitor voltage and the loop current decoupling model, and combining the input side flatness control strategy, the common-mode voltage control, the H-bridge sub-module voltage sharing control and the carrier phase shift modulation to jointly complete the flatness control of M3C. Compared with the prior art, the method has the advantages of quickening the global stabilization speed, having no static error in tracking, being high in dynamic performance and the like.