Abstract: The present disclosure discloses a rolling ring shrink fitting tool for rotary equipment, including a lifting frame; a movement slot is formed in a bottom surface of a top of the lifting frame; an output end of a first motor is connected with a main gear; guide rollers are embedded in a lifting seat through bearings; shrink fitting plates are two semicircular structures; lifting lugs are welded on outer sides of the shrink fitting plates; tooth rings are arranged outside the shrink fitting plates; stop rods are fixed on inner walls of the tooth rings; supporting screw rods are embedded at sunken positions on inner walls of the shrink fitting plates through bearings.

Abstract: The present disclosure discloses a rolling ring shrink fitting tool for rotary equipment, including a lifting frame; a movement slot is formed in a bottom surface of a top of the lifting frame; an output end of a first motor is connected with a main gear; guide rollers are embedded in a lifting seat through bearings; shrink fitting plates are two semicircular structures; lifting lugs are welded on outer sides of the shrink fitting plates; tooth rings are arranged outside the shrink fitting plates; stop rods are fixed on inner walls of the tooth rings; supporting screw rods are embedded at sunken positions on inner walls of the shrink fitting plates through bearings.

Abstract: An LED driving circuit includes a rectifying unit, a filtering unit, a power conversion unit and a leakage protection unit. The leakage protection unit includes: a main control chip capable of detecting an impedance of a power grid and turning on or off an LED driving circuit loop depending on whether the impedance of the power grid exceeds a set value; and a first switching element arranged outside the main control chip and controlled thereby to turn on or off the LED driving circuit loop synchronously with the main control chip. The present disclosure includes the first switching element capable of turning on or turning off the LED driving circuit loop, and the first switching element is arranged independently of the main control chip, achieving shunting of the current flowing through the leakage protection unit, reducing an operating temperature of the main control chip for compatibility with high power products.

Abstract: A hybrid ANC system that can allow a feedback microphone to receive the same external noise as a feedforward microphone. A processor can generate an anti-noise signal based on what both microphones received to cancel a broader range of frequencies of the external noise.

Abstract: The present invention relates to a lipase-producing strain and application thereof. The strain is classified and named Bacillus subtilis CS1802, with a preservation number of CCTCC NO: M2018262. The strain can be used to produce vitamin A palmitate through whole-cell transformation of vitamin A and palmitic acid. The Bacillus subtilis CS1802 of the present invention is derived from traditional natural fermented food and is a microorganism generally recognized as safe. The strain can be easily cultured and preserved. The highest content of vitamin A palmitate obtained through whole-cell transformation of vitamin A and palmitic acid is 15.35 mg/L. The highest transformation efficiency is 76.75%. The strain provides a new path for enzymatic synthesis of vitamin A palmitate and has important application prospects.

Abstract: A hybrid ANC system that can allow a feedback microphone to receive the same external noise as a feedforward microphone. A processor can generate an anti-noise signal based on what both microphones received to cancel a broader range of frequencies of the external noise.

Abstract: The present invention relates to a strain for producing chitinase and application thereof. The class of the strain is named Streptomyces diastaticus CS1801 and the preservation number thereof is CCTCC NO: M2018263. The Streptomyces diastaticus CS1801 of the present invention is derived from naturally fermented prawn paste. By fermentation of prawns, the enzyme activity of the chitosan is as high as 57.3 U/L and the content of chitooligosaccharides is 0.58 mol/L. The present invention provides a new method for producing chitooligosaccharides and has a good application prospect.

Abstract: A hybrid ANC system that can allow a feedback microphone to receive the same external noise as a feedforward microphone. A processor can generate an anti-noise signal based on what both microphones received to cancel a broader range of frequencies of the external noise.

Abstract: The invention relates to a GDSL lipase, genetically-engineered bacteria and an application thereof. The GDSL lipase is derived from Streptomyces diastaticus CS1801 and its amino acid sequence is as shown in SEQ ID NO.2. After construction of a genetically-engineered bacterium strain, a GDSL lipase is generated through fermentation. Through this enzyme, vitamin A and palmitic acid are converted to produce vitamin A palmitate. The content of the vitamin A palmitate obtained from the conversion is 16.35 mg/L at most. The conversion efficiency is 81.75% at most. This lipase provides a new path to synthesize vitamin A palmitate by the enzymatic method and has an important application prospect.

Abstract: The present invention relates to a strain for producing chitinase and application thereof. The class of the strain is named Streptomyces diastaticus CS1801 and the preservation number thereof is CCTCC NO: M2018263. The Streptomyces diastaticus CS1801 of the present invention is derived from naturally fermented prawn paste. By fermentation of prawns, the enzyme activity of the chitosan is as high as 57.3 U/L and the content of chitooligosaccharides is 0.58 mol/L. The present invention provides a new method for producing chitooligosaccharides and has a good application prospect.