119results about How to "Peak height" patented technology

The invention relates to electronic device having an operation temperature range, wherein the electronic device comprises a tunable capacitor (CST) comprising a first electrode (BE), a second electrode (TE), and a dielectric (FEL) arranged between the first electrode (BE) and the second electrode (TE). The dielectric (FEL) comprises dielectric material (FEL) having a value of a relative dielectric constant (ε_r) varying at least within the operation temperature range. The electronic device further comprises a temperature varying means (RES) being thermally coupled to the tunable capacitor for providing a temperature of the dielectric (FEL) causing a predetermined capacitance of the tunable capacitor (CST). The invention, which relies on the idea of varying temperature to vary a capacitance of a capacitor stack, provides an alternative tunable capacitor type for the known types. Advantageous embodiments feature high-tuning ratio, small device area, and stable capacitance value in case the temperature is well controlled. The invention further relates to a semiconductor device comprising the electronic device in accordance with the invention, to an electronic circuit comprising such electronic device, and to a method of manufacturing such electronic device.

The invention discloses a three-dimensional negative stiffness honeycomb structure and a preparation method thereof and relates to the negative stiffness honeycomb structure and the preparation method thereof. According to the structure and the method, the problem that an existing general honeycomb structure absorbs energy through plastic deformation, so the energy absorption is limited and the reuse of the honeycomb structure is also limited by the irrecoverability of the general honeycomb structure is solved. According to the structure provided by the invention, insertion pieces are prepared in a mode of 3D printing preparation or a cutting board; slots are arranged on the insertion pieces; the insertion pieces are embedded and locked together through the slots; and brazing is carried out, thereby preparing the three-dimensional negative stiffness honeycomb structure finally. The structure provided by the invention has high initial stiffness and high recoverable energy absorption. The structure and the method are applied to the field of aerospace.

Provided is an operating method of a full-bridge sub-module (FBSM)-based modular multilevel converter for HVDC transmission with AC-side voltage boosting. The peak value of the AC-side voltage is increased under a constant DC-link voltage by using FBSM's negative output voltage under steady state, wherein keeping the semiconductor's current rating constant during AC-side voltage boosting is in favor of reducing converter cost by decreasing energy interaction between the upper and lower arms in a leg, and further capacitance value of FBSM's capacitor under a constant capacitor voltage ripple, keeping the RMS value of AC-side current constant during AC-side voltage boosting can effectively improve transmission capacity of the converter while reducing converter cost, and keeping converter transmission capacity constant during AC-side voltage boosting can reduce RMS value of arm currents while reducing converter cost, thereby reducing power loss of FBSMs and improving converter efficiency.

The invention discloses a liquid-solid contact electrification friction nano-generator, which comprises a high-molecular material layer, an electrode layer and a reference electrode, wherein the high-molecular material layer and the electrode layer constitute a power generation unit, and the power generation unit and the reference electrode respectively constitute two poles of the liquid-solid contact electrification friction nano-generator; both sides of the electrode layer are covered with the high-molecular material layer; the electrode layer is sealed in the high-molecular material layer on both sides; the electrode layer and the reference electrode constitute an electrode pair through a wire and electric equipment; and both the reference electrode and the power generation unit are partially placed in the liquid. The high-molecular material layer sufficiently wraps the electrode layer, thereby not only being capable of enlarging the liquid-solid contact area, but also being capableof shielding the inductive charge of the liquid around the electrode layer to the electrode layer, enabling the charge generated by the contact between the liquid and the material to be sufficientlytransferred, and forming current in an external circuit. Compared with the prior art, the generating capacity of the liquid-solid contact electrification friction nano-generator is improved by 8.3 times, thereby solving the technical requirement of long-term energy supply for ocean sensors.

The invention provides a preparation method of a yeast culture. The preparation method includes following steps: (1), drying and pretreating a fermentation substrate; (2), mixing dolomitic limestone powder into the fermentation substrate after being dried and pretreated; (3), adding puffed corn meal and K2HPO4 into a product obtained in the step (2), and mixing well; step (4), inoculating brewer's yeast which is activated into the product obtained in the step (3), mixing well, and fermenting, drying and smashing a product obtained after mixing to obtain the yeast culture. Compared with conventional methods, the preparation method has the advantages that yeast peak value in the process of fermentation can be increased by 50-100%, mannan in the yeast culture can be increased by 20-50%, and fermentation time is shortened by 8-10h.

The invention relates to yogurt with low glycemic index, prepared by coupling a dairy product with stabilizer, sugar substitute, and inulin and carrying out strain fermentation, wherein the sugar substitute is selected from one or more of neotame, acesulfame, crystalline fructose, erythritol, xylitol, sucralose, and L-arabinose. The yogurt of the present invention is a dairy product with low glycemic index and high nutritional value, the glycemic index of the product is lower than 30, and the product is especially suitable for diabetic patients.

An Eu-doped red fluorescent powder has a chemical formula: aMo:bRE2O3:3B2O3:cEu2O3, where a=6-8, b=0-0.999, c=0.001-2.0, M is chosen from Mg, Ca, Sr and Ba, and RE is La, Y and/or Gd. It is prepared through proportioning, grinding, sintering at 900-1500 deg.C for 1-10 hr, cooling, and grinding. Its advantages are good match with 254 nm Hg line for charge migration band, high spectrum peak, and low cost.

The invention relates to a quality control method of fresh fleece flower root and prepared fleece flower root which comprises the steps as follows: A. standard crude drug powder of fresh fleece flower root or prepared fleece flower root is weighed and dissolved in acetone; the solution undergoes ultrasonic treatment and is then filtered, brought to constant volume and evaporated to dry; obtained dry powder is dissolved in methyl alcohol and the methyl alcohol solution is filtered by Millipore, thereby obtaining standard crude drug solution; fingerprint spectrum of the standard crude drug is then worked out by high performance liquid chromatography; the same method is then employed to establish fingerprint spectrum awaiting measurement of fresh fleece flower root or prepared fleece flower root to be measured; similarity between the fingerprint spectrum awaiting measurement and the standard fingerprint spectrum are then used for deciding whether the crude drug to be measured is qualified. B. contents of two index components, including 2, 3, 4', 5-tetrahydroxystilbene-2-O-beta-D-glucopyranoside and rheum emodin, are measured by high performance liquid chromatography. The quality control method has various judging evidences, thereby not only realizing qualitative detection of major chemical compositions of fresh and prepared fleece flower root, but also measuring contents of the two major components. The quality control method has reliable and precise measurement result, thereby reducing possibility of quality pass rate affected by manual treatment.

The invention relates to a trigger method of auxiliary valve in a short circuit current test apparatus. Steps of the method are as following: at t0 moment the auxiliary valve is triggered and bidirectional thyristor auxiliary valves are not triggered; the bidirectional thyristor auxiliary valves are triggered at t1 moment; tested valves are triggered at (t1+delta t1) moment; auxiliary valve of turn-off device is triggered at t2 moment; trigger pulse of the auxiliary valve, the bidirectional thyristor auxiliary valves and the auxiliary valve of turn-off device are locked out at (t1+delta t2) moment, and simultaneously the bidirectional thyristor auxiliary valves are triggered; and triggering of the bidirectional thyristor auxiliary valves is continuously carried out until the test ends. According to the method, exponential decay current, current stress superimposed by sine-wave current and voltage stress superimposed by reverse high voltage are respectively applied to a MMC valve of the tested converter valves, so that test to accident operation condition of the tested converter valves is realized.

The invention relates to a method for restraining and delaying the thermal oxidation coking and deposition of an aviation fuel RP-3 in an air-oil heat exchanger pipe and on a metal wall face of an aero-engine. In the method, a metal surface is pretreated and passivated, so that the catalytic activity of the surface to coking is reduced, the coking of the entire heat exchanger is reduced, the service life of the entire heat exchanger is prolonged, reliability is enhanced and maintenance cost is lowered. The pretreatment comprises the steps of performing acid-washing passivation and electrolytic polishing on the metal surface.

A thermal imaging camera, with an electromechanical shutter device for interrupting the ray path from time to time, has a motor (1), a motor shaft (2) and a shutter flag (3). The motor shaft (2) and the shutter flag (3) are in connection with one another via a crank-and-rocker mechanism. The crank-and-rocker mechanism includes a crank (4) rotatable about the motor shaft (2) with a crank pin (5) and with a rocker (6), at one end of which an elongated hole (8) is provided, which forms a rectilinear sliding joint together with the crank pin (5), and at the other end of which the shutter flag (3) is formed.

The invention discloses a device and method for generating a surface plasma wave. The device comprises a light source, a transmission optical fiber and a triangular prism, wherein the triangular prism is a pyramid with a rectangular bottom; the connecting line of the top point of the pyramid and the middle point of the diagonal lines of the bottom is perpendicular to the bottom; the pyramid sides where the two long sides of the bottom are positioned are isosceles right triangles; the bottom of the triangular prism is a sensing surface; a photocoupling layer and a metal film layer are sequentially plated on the sensing surface; the surface of the metal film layer is coated with an environment medium; one side of the pyramid sides, where the two short sides of the bottom are positioned, is taken as an incident plane, while the other side is taken as a reflecting plane. By virtue of the device and the method disclosed by the invention, the energy at the resonance concentrated area is concentrated, and the peak value is obviously increased, and at the same time, the device has the resonance spectrum modulation characteristic and high refraction response sensitivity.

The invention discloses a coal bed gas radio spectrum direction-finding early warning system. A radio astronomy modulation radiation receiving system is used to receive gas radio steady state and unsteady state radiation temperature signals in a gas enriched region in a coal bed so as to indirectly measure the coal bed gas pressure; a radio astronomy full-power radiation receiving system is used to receive gas radio unsteady state and quickly variable radiation intensity and form signals in the gas enriched region in the coal bed so as to judge the gas radio radiation type and variation rate; and a radio astronomy spectrum radiation receiving system is used to receive gas radio unsteady state and quickly variable radiation spectrum peak and frequency drift in the gas enriched region in the coal bed so as to early warn the coal gas outburst. Due to the fit of the maximum values of the three signals under different antenna bearings and elevations, and the trigonometry measurement, the direction and normal distance of the gas enriched region are measured.

The invention relates to biomass biogas fermentation, particularly a method for producing biogas from vinasse by high-temperature anaerobic fermentation, which comprises the following steps: (1) adding vinasse and inoculum into a fermentation bottle, and mixing; (2) adding water and an alkaline matter into the fermentation bottle to regulate the pH value; (3) after regulating the pH value, putting the fermentation bottle in a high-temperature shaking table, and carrying out fermentation; (4) collecting biogas by a drainage gas collection process in the fermentation process; (5) recording daily biogas yield and accumulative biogas yield, and determining the daily biogas composition by gas phase chromatography; and (6) after the fermentation finishes, calculating the biogas yield per unit volume and the biogas productivity per unit TS in the process of producing biogas from vinasse by high-temperature fermentation. By using the vinasse to produce the biogas by high-temperature anaerobic fermentation, the method has the advantages of high start speed, high gas production rate, energy saving and environment friendliness, and has very high popularization and use value.

An ignition timing control device for an internal combustion engine includes a storage device and a processor. The storage device stores a first learned neural network and a second learned neural network. The processor is configured to perform, in a next cycle where ignition timing is delayed, control to delay the ignition timing in a cycle after the next cycle based on a difference between a predictive value of an estimate of a value representing knocking intensity calculated with use of the second learned neural network and the estimate of the value representing the knocking intensity calculated with use of the first learned neural network. When the difference is larger than a predetermined set value, the processor is configured not to perform the control to delay the ignition timing in the cycle after the next cycle.

The invention discloses a transmitting and receiving system for improving comprehensive efficiency of an M-ary position phase shift keying (MPPSK) modem. An MPPSK modulation simple expression is used as basis, FORMULA, wherein omegac is angular frequency of a modulation carrier; Tc is equal to 2Pi/omegac and serves as a carrier period; rg is more than or equal to 0 and less than 1 and is used as a sign protection interval control factor; rg and integers M, N and K form a modulation parameter for changing the bandwidth, the transmission efficiency and the demodulation performance of a signal; an emitter is modulated by radio frequency or an emission medium frequency which is as high as possible; a receiver performs impact filter demodulation by up conversion frequency or a receiving medium frequency which is as high as possible; and therefore, a K value which is reduced by the emission end is increased, and the code error rate performance is improved.

The invention discloses a coding-enhanced focused ultrasound bone tissue microstructure detection method in a bone ultrasound system. The method includes the following steps: 1, adopting an ultrasound back scattering detection method, and enabling detection of a bone tissue microstructure to be equivalent to measuring of average scatterer interval according to a Faran cylinder model; 2, adopting a high-frequency single-array-element focused transducer, utilizing a complementary Golay sequence pair to excite an ultrasound transducer to emit time width signals, taking the emitted signals as a matched filtering function perform decoded compression on echo signals, and utilizing decoded compression back scattering signals to estimate the average scatterer interval, wherein the Golay sequence pair is adjustable in length. By the method, during measuring of the bone tissue microstructure MSS by utilizing ultrasound back scattering technology, ultrasound resolution ratio is increased, and influence, of sound attenuation, on measuring results is reduced. The coding-enhanced focused ultrasound bone tissue microstructure detection method is applied to the field of biomedical detection and tissue characterization.

The invention provides a synchronization method and device. The synchronization method comprises steps of performing sampling on received baseband signals; determining a sampling point position of a pilot signal which is inferred through the sampling point which is used as an initial position of a time slot; performing wave beam forming on the inferred pilot signal on the basis of the inferred sampling point position of the pilot signal; performing linear correlation on the signal after the wave beam forming and the preset pilot signal to obtain a relevant power value; and determining a synchronization position on the basis of a plurality of relevant power values which are obtained through using various sampling points as initial positions of the time slot. The synchronization method and device can be used in an interfered environment, improve the synchronization performance of the system and reduce the interference on the communication by the interfered environment.