11results about How to "Reduce fluctuation" patented technology

The invention belongs to the technical field of multi-port converter control, and relates to an inertia sharing control method based on a hybrid five-port converter, which realizes overall and inter-phase energy balance through overall and inter-phase inertia sharing control. Inertia support of a sub-module capacitor and a DAB output capacitor is realized through inertia sharing control of an LVDC port. The inertia support of the DAB output capacitor is realized through the inertia sharing control of the sub-module capacitor; the performance of the inertia support is improved through inertia sharing control of DAB output capacitance based on model prediction; power supply to a passive port is realized through voltage and current double-closed-loop control of an MVAC port; according to the method, four inertia sharing controllers and three balance controllers are provided, multi-stage joint control is fully scheduled, the virtual inertia control coefficient is increased, the fluctuation quantity of capacitor voltage is reduced, the system is helped to rapidly transit the transient state, the transient state performance of the system is optimized, and the dynamic performance and the operation boundary of the system are improved.

The invention relates to the technical field of safety early warning, in particular to an offshore equipment safety early warning system based on data analysis, which comprises a data acquisition module, a first determination module, a second determination module, a judgment module, an adjustment module and an early warning module. By collecting and analyzing key data of the wind power platform in real time, potential risks of the wind power platform under the conditions of sea condition change, uneven stress or structural damage and the like can be accurately recognized, the system effectively deals with fluctuation of an external environment by dynamically adjusting the height and the interval of the platform, structural abnormity is reduced, and the reliability of the system is improved. According to the method, finer safety early warning can be realized, an abnormal platform is identified and positioned in advance, the safety, stability and operation and maintenance efficiency of the wind power platform are greatly improved, and finally, a powerful guarantee is provided for sustainable development of the offshore wind power industry; the problems of insufficient early warning accuracy and slow response speed caused by complex change of the marine environment and limited sensor performance are effectively solved.

This invention discloses a green laser, which includes a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer stacked sequentially from bottom to top; the lower waveguide layer and the upper waveguide layer are several InN segregation suppression layers; the several InN segregation suppression layers include GaN and In a Ga 1‑a N, 0.01≤a≤0.4. Using the embodiments of the present invention, InN segregation is reduced, In composition fluctuations are decreased, the gain spectrum of the laser is narrowed, and the peak gain is increased. Simultaneously, the thermal stability of the high-In-composition quantum well in the green laser is improved, thermal degradation is reduced, the quality of the active layer and interface is improved, non-radiative recombination centers are reduced, optical catastrophes are eliminated, and the performance of the green laser is enhanced.

The invention discloses coal washing and dressing equipment with a screening mechanism, and relates to the technical field of coal washing and dressing, the coal washing and dressing equipment comprises a cleaning box and a sorting box, the cleaning box is filled with clear water, the sorting box is filled with heavy suspension liquid, and a first leakage hole conveying belt is obliquely mounted in the cleaning box; a driving mechanism is arranged on a driving rod of the first leakage hole conveying belt, a drying mechanism is arranged between the cleaning box and the sorting box, and a conveying mechanism is arranged in the sorting box. The first leak hole conveying belt reciprocates in water, coal briquettes are cleaned, meanwhile, due to the fact that the conveying distance to the separation box is larger than the conveying distance away from the separation box, the whole coal briquettes are conveyed to the separation box, the cleaning and conveying efficiency of the coal briquettes is improved, and the labor intensity of workers is reduced. And the coal briquettes are slowly conveyed into the separation box through the fifth leakage hole conveying belt, vertical floating of the coal briquettes and the gangue is reduced, and the flotation separation efficiency of the coal briquettes and the gangue is improved.

The invention discloses an energy-saving oil pumping unit, and relates to the technical field of oil pumping units. The driving assembly and the walking beam form a crank rocker mechanism, in the swinging process of the walking beam, the point positions of the force acting on the walking beam by a crank of the driving assembly are different, the force arm of the crank changes continuously, the load of the horse head is an alternating load, the balance assembly and a first balancing weight on the crank have the balance effect on the walking beam and the horse head, and therefore the horse head can be balanced. The static torque curve fluctuation quantity of the balanced crankshaft is small, so that the heat loss work of the driving assembly is small; the balance assembly comprises a second driving mechanism, a second balancing weight and a swing rod. The second driving mechanism drives the swing rod to rotate relative to the walking beam, and the torque acting on the walking beam by the second balancing weight and the swing rod can counteract the torque generated by the horse head relative to the rack assembly to a certain extent, so that the force required by rotation of the walking beam is reduced; the power generation assembly can convert mechanical energy of rotation of the walking beam into electric energy and supply the electric energy to the second driving mechanism, and the energy utilization rate is increased.

The present invention relates to the technical field of semiconductor optoelectronic devices, and in particular to a semiconductor laser element, which comprises, from bottom to top, a substrate, an n-layer cladding layer, a lower waveguide layer, an active layer, an upper waveguide layer, an electron blocking layer, a p-type cladding layer and a p-type semiconductor, wherein the active layer is In b Ga 1‑b N / In c Al d Ga 1‑c‑d N, n-type cladding layer has at least 3 Al gradient layers Al e Ga 1‑e N / A f In g Ga 1‑f‑g N / A h Ga 1‑ h N, there is an Al composition gradient between the n-type cladding layers and an Al composition gradient between the active layer: Al composition e>h>f≥d, Al f In g Ga 1‑f‑g The In component gradient formed by N and the active layer, upper waveguide layer, and lower wave layer constitutes the In component gradient. The polarization effect is regulated by the double gradient combination, the fluctuation and strain of the In component in the active layer are reduced, the gain spectrum width of the laser element is reduced, the exciton oscillator strength and peak gain are enhanced, the thermal stability of the active layer is improved, and the strong coupling of exciton-photons at room temperature is achieved, ultimately forming stable exciton-polariton lasing.

The invention provides a gate stack structure FeFET and a preparation method thereof, and belongs to the technical field of micro-nano electronics. The FeFET structure comprises a silicon substrate, a source laminated layer, a drain laminated layer, a gate metal electrode, a passivation layer and a contact metal electrode, the gate laminated layer comprises an aluminum oxide channel interface layer and a double-layer hafnium zirconium oxide ferroelectric layer, and a thin aluminum oxide middle interface layer is inserted between the double-layer ferroelectric layer to effectively inhibit continuous growth of crystal grains in the ferroelectric layer. A write pulse with a larger amplitude and a shorter width is applied to the gate region of the FeFET structure, so that the consistency and durability of the FeFET device are synergistically optimized; the preparation process of the FeFET is mature, can be quickly applied to large-scale circuit design of the FeFET, and has a wide application prospect.

The utility model relates to the technical field of unmanned aerial vehicle foot stands, in particular to an unmanned aerial vehicle foot stand which comprises a rack, a plurality of assembly holes used for assembly of an unmanned aerial vehicle are formed in the rack, assembly strips are symmetrically installed on the rack, and the unmanned aerial vehicle foot stand is characterized in that elastic bags used for reducing the impact effect are arranged on the assembly strips. Second alloy rods used for transmitting impact force are symmetrically arranged on the assembly strip, and a plurality of elastic shafts used for absorbing the impact force are arranged on the second alloy rods. Through the arrangement of the elastic bag and the buffer body, the impact force generated during landing of the unmanned aerial vehicle can effectively reduce damage to the rack, the transmission amplitude of the first alloy rod on the second alloy rod can be effectively relieved by the buffer body, part of the impact force can be directly dispersed by the elastic shaft, vertical floating borne by the second alloy rod is effectively reduced, and the service life of the unmanned aerial vehicle is prolonged. Therefore, the safety coefficient of landing preparation of the unmanned aerial vehicle is improved, and the efficiency of landing preparation of the unmanned aerial vehicle is improved.

The invention provides a single-ended sensitive amplifier circuit, a memory read circuit and a memory. The single-ended sensitive amplifier circuit comprises a clamping circuit with pre-charging control and a reference current comparison circuit, the clamping circuit with pre-charging control comprises a noise reduction unit, and the noise reduction unit is connected with the reference current comparison circuit; the clamping circuit with the pre-charging control is connected with the storage unit, and the clamping circuit with the pre-charging control is used for reading an operation signal; wherein the noise reduction unit is used for reducing the fluctuation quantity of the operation signal when the single-ended sensitive amplifier generates power supply noise fluctuation; and the reference current comparison circuit is used for comparing the operation signal processed by the noise reduction unit with a reference signal and outputting target data. The noise reduction unit is arranged in the single-end sensitive amplifier circuit, so that the fluctuation quantity of an operation signal in a power supply noise environment is remarkably reduced, and the anti-noise capability of the sensitive amplifier is improved.

The invention relates to the technical field of evaporation equipment, in particular to MVR continuous circulation evaporation equipment for chinlon elementary substance extraction. The problem that in existing MVR continuous circulation evaporation equipment, the amount of steam generated by a previous-stage device is unstable, and the follow-up process is affected is solved. Comprising fixed tanks which are uniformly distributed, evaporation parts are fixedly connected in the fixed tanks, the outer sides of the fixed tanks are fixedly connected and communicated with a gas storage tank, the gas storage tank is fixedly connected with a first electric push rod, the telescopic end of the first electric push rod is fixedly connected with a first sliding plate, and the first sliding plate is fixedly connected with first pressure sensors which are symmetrically distributed. Steam generated by the adjacent fixed tanks is temporarily stored and collected through the gas storage tank, then the collected steam is pushed out to the compressor at a uniform speed, the fluctuation amplitude of the steam amount is reduced, meanwhile, the generation situation of the steam in the adjacent fixed tanks is known in advance through the first pressure sensor, and a worker can make adjustment according to the actual situation conveniently.

The utility model relates to the technical field of internal mixers, and discloses a novel internal mixer with uniform heating and cooling, which comprises a base, a turnover mechanism arranged at the left upper end of the base, a heating and cooling system arranged at the left end of the turnover mechanism, a mixing chamber arranged at the right end of the turnover mechanism, a sealing device arranged on the mixing chamber, and a heating and cooling system arranged at the right end of the mixing chamber. A main transmission system is arranged at the right end of the mixing chamber, a pneumatic control system is arranged at the top of the mixing chamber, a PLC electric control system is arranged on the right side of the pneumatic control system, a thermal resistor is arranged in the mixing chamber, and a rotor stirring shaft is arranged in the mixing chamber and located on one side of the thermal resistor. A graphite sealing ring is arranged at the end part of the rotor stirring shaft. The rotor stirring shaft adopts two different forms, the end face and the shaft diameter are sealed, powder leakage is avoided, a PLC control system is adopted, linkage control can be achieved with an upper banburying auxiliary machine and a lower banburying auxiliary machine, and the automation degree is higher.