62 results about "Critical energy" patented technology

A laminated glazing material with properties of acoustic insulation and mechanical strength. The laminated glazing material including two glass sheets and a single-ply intermediate layer of a thickness having the form of a polymer film. The thickness of the intermediate layer being defined as a function of a variable which is specific to the material, and which defines the critical energy value of the intermediate layer and is representative of the energy necessary for propagation of a crack initiated in the intermediate layer.

The invention relates to an intelligent irrigation system based on optical radiation. The system is characterized by comprising an illumination monitoring device and an irrigation control system, wherein the illumination monitoring device is placed at an environment monitoring node in a facility and used for acquiring data of the illumination intensity in the facility; the irrigation control system acquires data of the illumination monitoring device regularly, accumulates and calculates the acquired illumination intensity data to obtain optical radiation accumulated energy, and compares the optical radiation accumulated energy within a set time period with preset critical energy; when the optical radiation accumulated energy is larger than the preset critical energy, the irrigation control system executes a preset irrigation strategy and sends a signal to an irrigation control cabinet to control electromagnetic switches of water conveying pipelines corresponding to corresponding facilities to be switched on to irrigate the facilities, the set irrigation requirements of the irrigation strategy are met, the electromagnetic switches are switched off, the irrigation is completed, and the system waits for the next irrigation. The intelligent irrigation system can be widely applied to agricultural irrigation of greenhouse and other facilities.

The invention provides a comprehensive debris flow disaster reduction method based on dynamic process and energy spectrum analysis. The method includes: judging the hazard inducing environment of a debris flow catchment, building a three-dimensional debris flow catchment model, and calculating the critical agglomeration quantity of loos soil forming debris flow and critical energy during debris flow outbreak; calculating catchment space debris flow feature parameters in a simulated manner according to a debris flow dynamic model and equation; analyzing energy during the movement of the debrisflow, and performing debris flow energy spectrum zoning according to energy distribution and energy increasing and attenuating features; providing the new comprehensive debris flow disaster reductionmethod based on dynamic process and energy spectrum analysis according to the energy spectrum features and the debris flow prevention and treatment function of each zone. The method is widely applicable to prevention and treatment engineering key parameter design, comprehensive debris flow disaster reduction technical systems, debris flow risk management and the like and has great theoretical significance and application value.

The invention provides a transient energy function analysis method considering inverter current saturation. Based on an inverter virtual synchronous generator control strategy, by establishing a virtual synchronous generator rotor movement equation and considering the inverter current saturation factor, a transient energy function is established with the first integral method; approximation is conducted on non-integrable terms relevant to path in the transient energy function with the linear path method, then the critical energy value is obtained with the BCU method, and critical clearing time is obtained. According to the transient energy function analysis method considering virtual rotational inertia and inverter current saturation, the stability of an electric system containing a virtual synchronous generator can be evaluated quantitatively; the transient energy function is established considering the inverter saturation factor and is closer to reality, the problem that system instability can be caused when a traditional online evaluation method is adopted due to conservative property is solved, and the method is an important supplement to time-domain simulation methods.

The invention provides a transient stability energy function analytical method for a power system including new energy. The method comprises the steps that a mathematic model of the power system including the new energy is built; the energy function of the power system is constructed according to the mathematic model, and approximation analysis is carried out on path continuous items in the energy function through trapezoidal integral paths; critical energy is solved through an iterative potential energy boundary surface method. According to the energy function method, the transient stability of the power system including the new energy can be evaluated fast and quantificationally.

The invention discloses a method for measuring the fracture toughness of an interface between a hard film and a soft foundation and belongs to the technical field of engineering materials, structural deformation and mechanical experiment equipment. In the method, due to the bending generated when the soft foundation deflects upward under pressure, the upper surface of the foundation is subjected to the effect of tensile stress, and a debonding or sliding failure happens on the interface between the hard film and the soft foundation; then the method can be used for solving a critical energy release rate of interface failures; and according to the Griffith energy rule, the critical energy release rate of the interface failures is used as the fracture toughness. The method is especially suitable for the structure of hard films and soft foundations, and is easy and convenient to operate.

The invention provides a transient energy function method in consideration of VSG inverter current limitation. The method comprises the steps that a current limitation model of an inverter is built; the power-angle characteristic under inverter current saturation is obtained; a system power-angle model in consideration of inverter saturation under a VSG strategy is built; an improved inverter current saturation element model is built, and a relation of an improved power angle and an unsaturated power angle is obtained; main parameters of electric parts are input; a Runge-Kutta method is used for solving a rotor motion equation to obtain delta(t) and dotted delta(t) of a VSG rotor, so that a fault trajectory is obtained, wherein delta(t) represents a relation of the system power angle and time, and dotted delta(t)=w(t) represents a relation of the system angular velocity and time; transient energy Vcl and critical energy Vcr of the system at the fault clearing time are obtained; the obtained transient energy Vcl and critical energy Vcr of the system at the fault clearing time are compared, if Vcl is smaller than or equal to Vcr, the system is stable, otherwise, the system is not stable; critical fault-clearing time is solved.

The invention discloses a transient stability control method for a microgrid with multiple virtual synchronizers, and belongs to the technical field of microgrid transient stability analysis and control. According to the method, the virtual inertia, the virtual damping, the virtual governor sag coefficient and the reactive power control loop sag coefficient are fully considered, an energy functionmodel of the microgrid with multiple virtual synchronizers operating in parallel is constructed and the stability of the system is analyzed and judged based on the energy function. Besides, an adaptive control method based on the energy function is applied to perform adaptive real-time adjustment on the virtual inertia, the virtual damping, the virtual governor sag coefficient and the reactive power control loop sag coefficient in VSG so as to reduce the system energy after the system failure, increase the attraction region of the system, slow down the process of the system energy reaching the critical energy, obtain the effective time for the failure removal and improve the transient stability of the system.

The invention discloses a preparation method and application for a Miscanthus Genic-SSR mark. The method comprises the following steps: A, acquiring Miscanthus transcriptomic sequence, that is, selecting young and tender Miscanthus leaves, extracting total RNA respectively so as to obtain transcriptome Reads, removing the pollution of carrier RNA sequence and carrying out splicing so as to obtainthe Miscanthus transcriptomic sequence; B, identifying SSR sites in Miscanthus ESR sequence, that is, searching SSR sites in obtained non-redundant Unigene-EST sequence by using SSR retrieval software, with repeats being 2 to 6 bases, so as to obtain a series of Unigene sequences containing information about the SSR sites; C, designing Miscanthus Genic-SSR primers, that is, using primer design software to design primers according to the obtained Unigene sequences containing the SSR sites so as to obtain a series of the Miscanthus Genic-SSR primers. According to the invention, the method is simple, has high efficiency and is simple to operate; a huge amount of marks are obtained; EST sequence obtained through transcriptomic sequencing lays a foundation for genetic research, molecular improvement and the like of the critical energy plant Chinese silvergrass.

The invention relates to a method for evaluating reactive power adequacy based on the heuristic energy function. Aiming at the defect that evaluation of reactive power adequacy in the prior art is not global and is low in precision, the invention discloses a method for evaluating reactive power adequacy of a power system based on the heuristic energy function, which is used for evaluating reactive power adequacy limit of the power system in the system global angle of view in a highly precise and rapidly fast manner. The technical scheme of the invention is as follows: the method comprises the following steps: a. introducing critical voltage of each node in an optimized multiplier measuring system; b. establishing a heuristic energy function model of the system and computing the critical energy of each node in the system; c. computing the global critical energy of the system; and d. obtaining the reactive power adequacy limit of the load nodes according to the critical energy of each load node. The method is mainly used for evaluating the reactive power adequacy of the power system and provides basis for reactive power compensation of the system.

The invention belongs to the technical field of inflammable gas accident prevention, and particularly relates to inflammable gas testing methods. The technical scheme includes that a system for testing critical energy of detonation formed by direct initiation comprises an initiation device (1), an oscilloscope and an ignition circuit, wherein the oscilloscope is connected with output of a pressure sensor (5) of the initiation device, and the ignition circuit is connected to the initiation device (1) through a triggering switch. The initiation device is applicable to measurement of initial pressure ranging from 1kPa to 20atm so as to be wide in testing pressure range, and is applicable to measurement of the critical energy formed by direct initiation of mixed gases of all gaseous fuel and oxygen or air. Detonation sensitiveness of various substances can be judged by measuring the critical energy of detonation formed by direct initiation of various inflammable mixed gases, so that a dangerous source can be controlled, and damage of detonation to life safety and property loss is avoided or reduced. The system is simple in structure, low in cost, easy in operation and accurate in measurement result.

The invention discloses an aircraft power system average value model and large-disturbance stability domain constructing method. The method comprises the following steps: establishing an aircraft power system average value model, wherein the equivalent circuit of the aircraft power system average value model comprises a power supply, a DC-side inductor, a DC-side resistor, a diode, a DC-side filter inductor, a DC-side filter resistor, and a load which are successively connected in series to form a closed loop, wherein the load is connected in parallel with a DC-side filter capacitor; constructing a stability domain, determining the mixed potential function of the system based on the aircraft power system average value model, constructing the Lyapunov energy function of the system, and calculating the critical energy of the system in combination with amixed potential function stability theorem, and determining the stability domain of the system. The invention provides an analysis tool for the modeling and stability analysis of a multi-electric aircraft power system, and can provide an evaluation method for system parameter design and optimization, and is suitable for multi-electric aircraft power system analysis and power electronic modeling field.

When laser beam welding two or more work pieces, the weld seam is usually visible on the work piece that is farthest from the laser beam, on the side of this work piece away from the laser beam. If this side is in an exposed area, then it must be reworked, which is expensive. The task of the present invention therefore consists of providing a method and a device for laser beam welding, with which a laser-welded seam can be formed without being so noticeable. The task is solved by determining the critical energy input per area unit and time unit into the work piece to be welded, above which an appearance of the welded seam to a degree exceeding a predetermined level will occur on the side away from the laser beam of the work piece that is farthest removed from the laser beam, and that the laser beam is controlled or regulated in such a way that the critical energy input per area unit and time unit is not exceeded.

The invention provides a flexible display panel motherboard and a manufacturing method of a flexible display panel, and relates to the technical field of display. The problem that in the manufacturing process of an existing flexible display panel, because a base coat is separated from a carrier substrate, mote is generated, the surrounding technological environment is polluted is solved. The flexible display panel motherboard comprises a carrier substrate and at least one flexible display panel unit formed on the carrier substrate, wherein the flexible display panel unit comprises a base coat, a flexible substrate and a display component which are all formed on the carrier substrate, the base coat of the flexible display panel unit comprises a first area and a second area, the laser absorptivity of the part, in the first area, of the base coat is lower than that of the part, in the second area, of the base coat, the critical energy of the part, in the second area, of the base coat is no larger than the critical energy of the part, in the first area, of the base coat, and the first area is located in the area of the edge of the flexible display panel unit.

The invention discloses a mine rock burst intensity prediction method and device, and the method comprises the following steps: determining the mining accumulation energy UT-D of a coal body based onthe total energy of mining coal and the damage energy consumption of the coal body under the mining condition; determining critical energy UL of the rock burst based on the coal body damage loss energy and the broken coal body throwing energy; accumulated energy UT-based on mining And D and the critical energy UL, predicting the intensity of the rock burst.

In one aspect, inks for use with a three-dimensional (3D) printing system are described herein. In some embodiments, an ink described herein comprises up to 80 wt. % oligomeric curable material; up to 80 wt. % monomeric curable material; up to 10 wt. % photoinitiator; up to 1 wt. % non-curable absorber material; and up to 10 wt. % one or more additional components, based on the total weight of the ink, and wherein the total amount of the foregoing components is equal to 100 wt. %. Additionally, the photoinitiator is operable to initiate curing of the oligomeric curable material and/or the monomeric curable material when the photoinitiator is exposed to incident curing radiation having a peak wavelength λ. Moreover, the ink has a penetration depth (D_p), a critical energy (E_c), and a print through depth (D_PT) at the wavelength λ of less than or equal to 2×D_p.

Methods for determining parameters of a semiconductor material, for example, non-classical substrates such as silicon-on-insulator (SOI) substrates, strained silicon-on-insulator (sSOI) substrates, silicon-germanium-on-insulator (GeOI) substrates, and strained silicon-germanium-on-insulator (sGeOI) substrates are described. The method provides steps for transforming data corresponding to the semiconductor material from real space to reciprocal space. The critical points are isolated in the reciprocal state and corresponding critical energies of the critical points are determined. The difference between the critical energies may be used to determine a thickness of a layer of the semiconductor material, in particular, a quantum confined layer.

The invention discloses a semiconductor bridge energy conversion chip for an electro-explosive device. The semiconductor bridge energy conversion chip comprises polycrystalline silicon bridge steps, electrodes and an insulating layer, two ends of the polycrystalline silicon bridge steps, which are perpendicular to electric current direction, are in inner concave circular arc shapes, two ends of the bridge area of a semiconductor bridge are merely designed to be circular arc bridge areas, so that the field strength density is uniform in electromagnetic field environment, the local concentration of field strength and density increasing are not prone to occur, simultaneously the circular arc bridge areas of the two ends can meet requirement of low ignition critical energy of an initiating explosive device, the structure is extremely simple, cost increasing is not required, requirements of low ignition critical energy, reliable ignition and anti-static strength improvement can be easily and synchronously achieved.

This invention relates to assistant laser crystal method, which comprises the following steps: forming non-crystal silicon layer on baseboard; then forming one thermal band in the non-crystal silicon layer, wherein, by control of thickness of the band, the band has one reflection thickness to lower non-crystal silicon melt threshold energy; Finally processing laser heating and crystal process to make the non-crystal into multi-crystal, wherein, the part laser energy passes thermal band to melt non-crystal layer with part laser energy in the ban to heat up non-crystal layer.

The invention provides an evaluation method and device of single event upset (SEU), and relates to the field of radiation hardening of semiconductor devices. The method and device are used for solvingthe problem that single event upset cannot be simulated and analyzed in the prior art. The method includes: establishing a geometric model of a static random access memory (SRAM), wherein the geometric model includes two layers, and a sensitive area is the second layer and is located below the first layer; irradiating the sensitive area of the geometric model through a monte carlo method according to preset parameters of incident particles to obtain deposited energy, wherein the preset parameters of the incident particles include the number of the incident particles and energy of the incidentparticles; and if the deposited energy reaches preset critical energy, determining that the incident particles cause one time of single event upset.

The invention discloses a measuring method for fracture toughness of a bubbling interface of a bridge deck pavement layer. The method comprises the following steps: (1) taking bridge deck pavement layer test pieces in different bubbling radiuses; (2) applying an even load to the bridge deck pavement layer; (3) recording a bubbling change and processing, calculating to obtain a deflection w; (4) calculating an elasticity modulus E in combination with a deflection w formula; (5) according to a critical load q and E, calculating a critical energy release rate GC; (6) according to modal analysis,acquiring critical stress intensity factors K1c and K2c of I-type and II-type fracture interfaces; (7) according to the step (6), calculating a modal phase angle Psi; (8) according to GC, Psi and interface fracture toughness Gamma 0 (Psi), acquiring pure I-type interface fracture toughness GIC and a test parameter Lambda; and (9) through Gamma 0 (Psi), evaluating the extend property of the bubbling interface of the bridge deck pavement layer. The method is used for evaluating the extend property of the bubbling interface of the bridge deck pavement layer, and providing a theoretical foundationfor preventing the bridge deck pavement layer from generating damages, such as bubbles and pit slots.

The invention relates to a wind power limit penetration power optimization method and device. The method includes the steps of obtaining the transient energy and critical energy at the time of grid fault removal, obtaining the transient stability index according to transient energy and critical energy, optimizing a wind power admission capacity optimization model according to the transient stability index, obtaining the wind power limit penetrating power according to the optimized wind power admission capacity optimization model, and configuring the power grid according to the obtained wind power limit penetrating power. According to the wind power limit penetration power optimization method and device, the transient energy and critical energy at the time of grid fault removal are obtained, the transient stability level and elasticity value of a power grid with blower fans can be directly quantified through transient stability index to form transient safety constraints, and the safety influence of blower fan capacity on the power grid can be directly shown. Transient safety and other constraint conditions can be comprehensively taken into consideration. Blower fan installed capacity can be maximized under the prerequisite of safe operation of a power grid, thereby reducing operation risks of the power grid.

The invention relates to an analysis method for the influence of wind farm access on a fault limit cut-off time of a multi-machine system. Based on a transient energy function theory, starting from anoriginal multi-machine system, a first integral method is used to construct a transient state energy function of the multi-machine system including a wind farm. On the basis, a relationship between acritical energy value of the system and the transient output power of the wind farm is derived, the change of a critical energy borne by the system brought by the change generated by a network topology structure due to the access of a DFIG is quantitatively analyzed, and the influence of the wind farm access on system stability margin is reflected from the perspective of critical energy. According to the influence of the DFIG on the equivalent electromagnetic power of the system during a fault period, the change of a system state variable and an energy accumulation process are analyzed, and the influence mode of the wind farm access system on the speed of the system transient energy accumulation is given. The fault limit cut-off time is calculated by the accumulation time from the transient energy to the system critical energy.

The invention relates to a quantitative evaluation method for transient synchronous stability of a permanent magnet synchronous wind driven generator based on a Lyapunov direct method, and discloses a transient energy function method capable of quantitatively evaluating the transient stability of a wind power grid-connected system. The method comprises: based on the Lyapunov theory, constructing an energy function for a permanent magnet synchronous wind driven generator grid-connected system, used for quantitatively evaluating the transient synchronization stability of a fan; firstly, through reasonable order reduction of a grid-connected voltage source type converter control system, establishing a simplified fan grid side converter control model, and the model considering the influence of outer loop control on the dynamic characteristics of a phase-locked loop; then, deriving a fan synchronous motion equation similar to the synchronous machine rotor motion equation; on the basis of the synchronous motion equation, constructing a transient energy function of the fan by using a first integral method, and determining a critical energy value of the transient energy function by using a potential energy boundary surface method; and comparing the energy when the fault is removed with a critical energy value so as to judge the transient synchronization stability of the system. According to the method, the transient synchronous stability of the permanent magnet synchronous wind driven generator-infinite bus system is quantitatively evaluated.

The invention discloses a metering, testing and control method for internal pressure reduction flowing characteristic of a labyrinth disc pressure reducing valve. The metering, testing and control method comprises the following steps: a circulating pipeline loop is built, a labyrinth disc pressure reducing valve is installed, and water flushing and pressurizing are conducted; the circulating pipeline loop is divided into a plurality of sections of sub-runners, and a pressure strain gauge and a flow meter are mounted on a longitudinal cross section; detection is carried out to obtain a pressurevalue and a flow rate value; a harmonic average value is calculated; discrete curves of harmonic average values, varying along with inlet pressure, at different cross sections are drawn; energy dissipation maps corresponding to different inlet pressures are drawn; interpolation calculation is carried out; a critical energy dissipation value is determined; the opening degree of a valve is adjusted, and the number of layers of labyrinth discs in a labyrinth disc sleeve is adjusted to obtain an energy dissipation map; and a real-time energy dissipation value is obtained in a dynamic test and iscompared with the critical energy dissipation value for control. According to the metering, testing and control method, self-adaption adjustment of testing is realized, optimal control of operation isrealized, self-release of cavitation/erosion failure critical characteristics of the labyrinth disc type pressure reducing valve in a complex service environment is achieved, and the quantitative metering and testing method is high in accuracy.