37results about How to "No filtering required" patented technology

The invention relates to a preparation method of medium / high-viscosity alpha,omega-dihydroxypolydimethylsiloxane, which comprises the following steps: heating low-viscosity dihydroxypolydimethylsiloxane to 160-250 DEG C under reduced pressure of -0.1 to -0.05MPa, stirring, and immediately cooling to finish the reaction when the product viscosity achieves the preset value, thereby obtaining the medium / high-viscosity alpha,omega-dihydroxypolydimethylsiloxane. The method provided by the invention does not use any catalyst or neutralizer in the reaction process, and does not need filtration, and the product yield is high; the invention has the advantages of short time and high production efficiency in the whole preparation process; the molecular weight distribution of the product is narrow; and the content of alkali metal ions in the product is very low.

The invention discloses a resonant grounding system single-phase grounding fault section positioning method integrated with high-frequency and power frequency zero-sequence component phase features, and the method comprises the steps: 1, processing a zero-sequence voltage and zero-sequence current, collected by each data collection device, through a matrix pencil algorithm, and obtaining the phases of all frequency components of the zero-sequence voltage and the zero-sequence current; 2, calculating the phase angle difference dph(50) of a zero-sequence voltage power frequency component and a zero-sequence current power frequency component of the same collection device; 3, calculating the phase angle difference dph(fm) of any one high-frequency component of the zero-sequence voltage and any one high-frequency component of the zero-sequence current; 4, calculating the absolute value dj of the difference between the phase angle difference dph(50) and the phase angle difference dph(fm); 5, recognizing a fault segment according to the size of dj. The method makes the most of the features of the high-frequency and power frequency components. Compared with a conventional resonant grounding system section position method based on transient features, the method does not need to carry out filtering.

The invention belongs to the field of coatings. Corresponding products can be applicable to industrial corrosion prevention and architectural ornament. The invention discloses a multifunctional environmental-friendly inorganic silicate coating which comprises a component A and a component B, wherein the component A comprises pigments; the component B comprises a silicate solution and a modifier. The coating is excellent in stability and excellent in film-forming effect.

A large-power wind power generation device comprises at least two fans (1), a turbine generator (2), and a solar electric heating device (3). The at least two fans (1) are communicated with an air inlet of the turbine generator (2) by means of parallel gas pipelines. The solar electric heating device (3) is electrically connected to a standby gas tank of each fan (1). The device greatly improves the installed capacity of a single set, the generating capacity is stable, the output voltage is stable, filtering and rectification are not required, the device can be interlaced and laminated in space, and the limited space of a wind field can be more effectively utilized.