4results about How to "Provide stable" patented technology

The utility model discloses a 700V direct current bus-based grid-connected and off-grid wind-light hydrogen storage coupling hydrogen production power supply system. The system comprises a photovoltaic power generation module, a wind power generation module, a hybrid energy storage module, a grid-connected module and a water electrolysis hydrogen production module. The photovoltaic power generation module and the wind power generation module are respectively connected to a 700V direct current bus through a DC / DC converter and an AC / DC rectifier, and power switch tubes in the DC / DC converter and the AC / DC rectifier all adopt SiC MOSFETs. When a power grid operates normally, if the electric energy supplied to the water electrolysis hydrogen production module by the wind and light power generation module is redundant, the redundant electric energy is stored in the hybrid energy storage module; and if the generating capacity of the wind power generation module and the photovoltaic power generation module is insufficient, the electric energy stored by the hybrid energy storage module is released to the water electrolysis hydrogen production module, so that efficient and stable operation of the water electrolysis hydrogen production module is ensured. When a power grid breaks down, the system operates in an off-network mode, and the wind and light power generation module and the hybrid energy storage module jointly provide electric energy needed by operation of the water electrolysis hydrogen production module.

The invention discloses an accurate search recommendation method and system based on user portraits and big data analysis, and the method comprises the steps: continuously collecting the attribute information of a promotion activity, constructing an evaluation index, and calculating a potential influence score of the promotion activity; obtaining the basic weight of the behavior type, and updating the sensitivity index according to the behavior type and strength; determining an association relationship between a content item corresponding to the behavior and the promotion activity, if so, calculating an external induction probability based on a potential influence score and a sensitivity index, and using the external induction probability as an attenuation factor to update a behavior weight; and generating a recommendation result based on the updated weight, judging the user feedback after the recommendation result is generated in the time window again, updating and iterating the time accumulation data of the behavior data feedback of the user, and continuously correcting the user portrait and the interest weight thereof, so that the user behavior feedback data under the condition of not neglecting the promotion activity is obtained. And meanwhile, real accurate recommendation is realized.

The utility model discloses a sulfur vapor preparation device which comprises a sulfur melting device, a secondary sulfur heating device, a sulfur melt atomizing device and a sulfur vapor separation device, the sulfur melting device comprises a sulfur melting tank and a first heating device connected with the sulfur melting tank; the secondary sulfur heating device comprises a sulfur melt storage device and a second heating device connected with the sulfur melt storage device; a liquid outlet of the sulfur melt storage device is connected with the sulfur melt atomization device; an outlet of the sulfur melt atomization device is communicated with a liquid inlet of the separation device, and a liquid outlet of the separation device is communicated with the sulfur melt storage device; a gas outlet of the separation device is connected with a sulfur steam using device through a regulating valve; and high-efficiency low-temperature preparation of pure sulfur steam is realized.

The application relates to a continuous supercritical fluid spinning system for continuously preparing micro-nano fiber non-woven fabric, which comprises a supercritical fluid spinning liquid preparation device, a micro-nano fiber supercritical spinning device, a secondary drawing and bundle collecting device of micro-nano fiber, the supercritical fluid spinning liquid preparation device is connected with the micro-nano fiber supercritical spinning device, the micro-nano fiber supercritical spinning device is arranged above the secondary drawing and bundle collecting device of micro-nano fiber, the supercritical fluid spinning liquid preparation device is used for continuously preparing uniform and stable supercritical fluid spinning liquid, the micro-nano fiber supercritical spinning device is used for preparing uniform and continuous micro-nano fiber, and the secondary drawing and bundle collecting device of micro-nano fiber is used for secondary drawing and bundle collecting of micro-nano fiber. Compared with the prior art, the continuous supercritical fluid spinning system can continuously prepare non-woven fabric with high strength, good barrier property and excellent air permeability.