10results about How to "Slow change" patented technology

The present invention provides a dental ceramic coloring solution with which the desired shade can be imparted to a dental ceramic while improving the strength of the dental ceramic. The present invention relates to a coloring solution for coloring a dental ceramic, comprising a coloring component, a solvent, and a Zr component.

Provided is a valve capable of accurately moving a valve body in a direction away from a valve seat. A bellows 60 that is expandable and contractible in an axial direction is disposed across the valve body 51 and the valve housing 10 on an axially opposite side of a valve seat 10f through the valve body 51.

The present invention discloses a method for diagnosing a wind turbine bearing pair fault based on temperature information, which belongs to the field of renewable energy equipment status monitoring and fault diagnosis. The method mainly performs fault diagnosis based on the relative size relationship of the temperature of the bearing pair (front and rear end bearings). When one of the bearings in the bearing pair fails, the temperature relationship of the bearings at both ends deviates from the original law. The degree of deviation is quantified by the Euclidean distance between the state point and the boundary of the healthy data set. The calculated distance is smoothed to diagnose the abnormal state according to whether it exceeds the threshold continuously. The beneficial effect of the present invention is that the operating status information of the bearing is mined from the distribution relationship between the bearing pair temperatures by using the wind power SCADA operating data, thereby avoiding relatively complex vibration signal analysis, effectively utilizing the SCADA operating data, and improving the efficiency of bearing fault diagnosis.

The invention belongs to the technical field of soil sample preservation, relates to a soil sample preservation method and device, and aims to provide an efficient, reliable and environment-friendly soil sample long-term preservation solution. The method comprises the following steps: preheating a sample container, adding a soil sample, quickly sealing, cooling and storing, keeping out of light in the whole process, and forming 0.7-0.9 atm negative pressure; the device comprises an outer bottle, an inner bottle, a bottle cap, a high-temperature box and a low-temperature box. By accurately controlling the temperature and the negative pressure, the sample storage efficiency and reliability are improved, meanwhile, the environmental pollution and the operation risk are reduced, and the stability and the analysis accuracy of the soil sample are ensured. The method and the device are easy to operate, dependence on professional skills is reduced, material waste and equipment maintenance cost are reduced, and good economical efficiency and practicability are achieved.

The embodiment of the invention discloses a grid-connected control method and device for a network-forming converter and a storage medium. The grid-connected control method for the grid-forming converter comprises the following steps: if a grid-connected switch signal of a grid-connected switch is a closed signal, acquiring the current active power of the grid-forming converter; obtaining an electrical parameter adjustment instruction value according to the current active power and a preset active-frequency loop control model; wherein the active-frequency loop control model is determined according to an off-grid internal potential rotor angle parameter of the network construction type converter, a voltage phase angle of a power grid and a rotor angle motion model of the network construction type converter; and the electrical parameter adjustment instruction value is sent to the network construction type converter to execute electrical parameter control so as to reduce electrical parameter overshoot output by the network construction type converter. According to the scheme, the change of the electrical parameters including the active power, the reactive power and the frequency output by the network construction type converter can be more relaxed, and the energy impact brought to the power grid when the network construction type converter is connected to the grid is relieved.

The present invention provides a method for determining heavy metal elements in polymers and its application, which relates to the field of heavy metal detection. Specifically, ultraviolet light is first used to decompose the polymer sample, and then a microwave digestion instrument is used to completely digest the polymer sample. HNO 3 +H 2 O 2 +HClO 4 +HF acid digestion system is used to detect heavy metal elements lead, cadmium and mercury in plastics or polymer materials in electronic and electrical products and materials, further improving the rapid detection method of heavy metal element content in plastics and other polymers. The present invention solves the problem of incomplete digestion of many plastics, and at the same time solves the problem that some fillers in plastics cannot be digested, reduces the subsequent processing process, achieves the purpose of rapid and efficient, and further improves the method of rapid analysis of heavy metal content in plastics.

The invention provides a transformer winding and a method for constructing the transformer winding, the transformer winding comprises a leading-out terminal, and the leading-out terminal comprises a leading-out wire of a winding conductor of the transformer winding; the insulating layer wraps the lead-out wire; the grounding shielding layer covers one side, close to the winding conductor, of the insulating layer; the stress slow-release material layer is made of a semi-conductive material, covers one side, far away from the winding conductor, of the insulating layer, and is electrically connected with the grounding shielding layer; wherein the stress sustained-release material layer is matched with the impedance of the insulating layer.

This application provides an arc-extinguishing system and a circuit breaker, belonging to the field of electrical equipment technology. The arc-extinguishing system provided in this application includes a stationary contact, an arc-extinguishing chamber, and a stationary cover. The stationary contact includes a fixed part and a contact part connected to each other. The fixed part is connected to the base of the circuit breaker, and the contact part has a guide groove that extends through the contact part. The arc-extinguishing chamber is disposed on the contact part. The stationary cover is disposed on the portion of the contact part that does not contact the arc-extinguishing chamber. A hook and a limiting block are provided on the side of the stationary cover facing the contact part. The hook passes through the guide groove and hooks to the side of the contact part facing away from the stationary cover. The limiting block is located within the guide groove and contacts the groove wall. The stationary cover mentioned in this application can limit the position of the stationary cover in the thickness, length, and width directions of the stationary contact, reducing the probability of changes in the relative position between the stationary cover and the stationary contact. This improves the shielding efficiency of the stationary cover on the contact part, thereby increasing the reliability of the arc-extinguishing system.

The invention relates to an S-doped g-C3N4 / Bi2MoO6Z type heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. The preparation method of the catalyst comprises the following steps: mixing and grinding melamine, ammonium bromide and thioacetamide, and then carrying out a thermal polycondensation reaction to synthesize S-doped g-C3N4; mixing the S-doped g-C3N4 with a molybdenum source and bismuth source solution to form a turbid liquid; and finally, carrying out solvothermal reaction on the turbid liquid to obtain the S-doped g-C3N4 / Bi2MoO6 photocatalyst. The preparation process is simple, the cost is low, the operation repeatability is high, and the prepared catalyst has a homogeneous structure and excellent visible light photocatalytic activity, can effectively degrade organic pollutants, and has a wide application prospect, especially in the fields of energy and environmental governance.

This invention discloses a crystalline polyimide / polyimide composite material, its preparation method, and its applications. The method involves first uniformly mixing phenylhexacarboxylic acid trihydride with a diamine monomer, followed by a solid-phase reaction under argon atmosphere protection. After the reaction, the product is immersed in a polar solvent to obtain crystalline polyimide. Then, the crystalline polyimide is added to an organic solution of polyamic acid, subjected to ultrasonic treatment in an ice-water bath, and subsequently thermosetting to obtain the crystalline polyimide / polyimide composite material. The crystalline polyimide in this composite material has a layered two-dimensional COF structure, giving it relatively high thermal conductivity, heat resistance, and high-temperature mechanical properties. Introducing the crystalline polyimide into the polyamic acid solution utilizes the special interfacial compatibility between the amino groups in the crystalline polyimide and the anhydrides in the polyamic acid to react, solving the problem of difficult processing and effectively expanding its application range.