Abstract: An Acidaminococcus fermentans strain and use thereof in improving rumen fermentation are provided, and relates to the technical field of microorganisms. An acid-producing strain of Acidaminococcus fermentans P47 is obtained by screening, which has desirable passage stability and safety. The strain can increase a ratio of butyric acid in the rumen of a ruminant, improve rumen fermentation parameters of a pre-weaning calf, promote rumen fermentation, improve a rumen environment, and increase an average daily gain (ADG) of the ruminant.

Abstract: A Parabacteroides distasonis strain isolated from rumen of calf and use thereof are provided, relating to the technical field of microorganisms. Provided is a Parabacteroides distasonis strain that simultaneously increases proportions of propanoic acid and butyric acid in a rumen of a ruminant. The strain shows desirable passage stability, safety and resistance, is beneficial to improving an internal environment of the rumen, and maintaining a microecological balance in the rumen; the strain is also beneficial to promoting fermentation in the rumen, promoting nutrient digestion of animal, and enhancing animal immunity. The Parabacteroides distasonis strain was isolated from the rumen of a Holstein cow and can be used as a probiotic additive to feed animals, thereby exhibiting great prospects in the expansion of microbial inoculants for ruminants and the feed industry.

Abstract: In the field of data storage, a metadata query method and an apparatus are disclosed to improve metadata searching efficiency. The method is applied to a linked snapshot. A metadata query request is received. A first time sequence identifier is obtained from the first snapshot volume based on the volume identifier of the first snapshot volume. A historical index information is queried based on the data block identifier and the first time sequence identifier. When the data block identifier exists, and the first time sequence identifier falls within a corresponding query time sequence interval a corresponding target volume identifier is obtained from the historical index information. Address metadata corresponding to the data block identifier are obtained from a second snapshot volume indicated by the target volume identifier.

Abstract: The present invention provides a quantum dot light-emitting diode device, which includes a substrate, a first electrode disposed on the substrate, a hole layer vertically disposed on an anode, wherein the hole layer includes a sidewall, an electron transport layer disposed on the sidewall, a quantum dot layer disposed on the electron transport layer, and a second electrode disposed on the electron transport layer. A density of the zinc oxide nanowire is high in the present disclosure, causing high light current density, which greatly improves a brightness of light to achieve a purpose of increasing a light-emitting performance of the light-emitting diode device.

Abstract: The present invention provides a quantum dot light-emitting diode device, which includes a substrate, a first electrode disposed on the substrate, a hole layer vertically disposed on an anode, wherein the hole layer includes a sidewall, an electron transport layer disposed on the sidewall, a quantum dot layer disposed on the electron transport layer, and a second electrode disposed on the electron transport layer. A density of the zinc oxide nanowire is high in the present disclosure, causing high light current density, which greatly improves a brightness of light to achieve a purpose of increasing a light-emitting performance of the light-emitting diode device.

Abstract: A visible light band reflection metasurface device and a reflected light wavelength modulation method. The device successively includes, from top to bottom, a metal metasurface layer with periodically arranged antenna units, a modulation layer formed by an electro-optic material, a metal reflection layer and a substrate layer; the antenna unit period is less than the incident wavelength, and the thickness is greater than the skin depth of metal and less than 100 nm; the thickness of the modulation layer is less than the wavelength of the incident light; and the thickness of the metal reflection layer is greater than the skin depth of metal and less than the wavelength of the incident light; and an external voltage source can modulate the color of the reflected light, and can achieve voltage modulation of the color of reflected light in the visible light band.

Abstract: A visible light band reflection metasurface device and a reflected light wavelength modulation method. The device successively includes, from top to bottom, a metal metasurface layer with periodically arranged antenna units, a modulation layer formed by an electro-optic material, a metal reflection layer and a substrate layer; the antenna unit period is less than the incident wavelength, and the thickness is greater than the skin depth of metal and less than 100 nm; the thickness of the modulation layer is less than the wavelength of the incident light; and the thickness of the metal reflection layer is greater than the skin depth of metal and less than the wavelength of the incident light; and an external voltage source can modulate the color of the reflected light, and can achieve voltage modulation of the color of reflected light in the visible light band.

Abstract: In the field of data storage, a metadata query method and an apparatus are disclosed, to improve metadata searching efficiency. The method is applied to a linked snapshot, and includes: receiving a metadata query request; obtaining a first time sequence identifier from the first snapshot volume based on the volume identifier of the first snapshot volume; querying historical index information based on the data block identifier and the first time sequence identifier; and when the data block identifier exists, and the first time sequence identifier falls within a corresponding query time sequence interval, obtaining a corresponding target volume identifier from the historical index information, and obtaining, from a second snapshot volume indicated by the target volume identifier, address metadata corresponding to the data block identifier (304).