Abstract: A zipper structure for a seat slide rail capable of preventing foreign matters comprises an upper rail and a lower rail; the upper rail and the lower rail are in sliding fit; zipper heads movably connected to the upper rail are respectively arranged at the two ends of the upper rail; two sets of dustproof rubber covers are fixedly arranged at the upper end of the lower rail; the two sets of dustproof rubber covers are respectively arranged on the two sides of the lower rail; a sewn elastic cloth is arranged between the dustproof rubber covers and the lower rail; one side of the sewn elastic cloth is fixedly connected to the dustproof rubber covers, and zipper racks are arranged on the other side of the sewn elastic cloth; the two sets of zipper racks are respectively communicated with the zipper heads; and when the zipper heads slide, the two sets of zipper racks are meshed with each other or separated from each other.

Abstract: The present application discloses a method and apparatus for determining the settling rate of proppants in hydraulic fracturing. The method comprises: acquiring the target mesh size of the proppant; obtaining the bulk density of the proppant, and the density and viscosity of the carrier fluid under reservoir conditions; retrieving the proppant concentration (sand ratio) during injection; and applying a pre-established predictive model specific to the selected mesh size. The model inputs include proppant bulk density, carrier fluid density, reservoir-temperature viscosity, and sand ratio, and the output is the estimated settling velocity. This method effectively addresses the technical challenge of predicting proppant transport behavior under downhole conditions, thereby enhancing proppant placement accuracy and improving fracture conductivity in low-permeability formations.

Abstract: This utility patent discloses a method, device, and computing apparatus for calculating fracturing fluid leak-off volume in reservoir matrices, within the field of petroleum exploitation. The method includes: acquiring pressure data from measurement points in core samples during fracturing fluid damage tests; determining fluid-induced damage length based on the data; calculating permeability variation parameters as a function of invasion depth; computing fluid invasion depth using fracturing fluid density, viscosity, and permeability variation; and calculating total leak-off volume based on average fracture height and length of primary and branch fractures. The method enables fast and accurate estimation of fluid loss by incorporating key factors such as permeability variation with depth, fluid density, and viscosity, offering a reliable foundation for hydraulic fracturing design.

Abstract: A switch to haploid embryogenesis is controlled by the activity of histone deacetylases (HDACs). Blocking HDAC activity with HDAC inhibitors (HDACi), e.g., trichostatin A (TSA), in Brassica napus, B. rapa, Arabidopsis thaliana, and Capsicum annuum male gametophytes leads to a large increase in the proportion of cells that undergo embryogenic growth. In B. napus, treatment with one specific HDACi (SAHA) improves the conversion (i.e., germination) of these embryos into seedlings. Existing methods of culturing microspores of angiosperm plants following stress to produce haploid embryos, haploid plants, and double haploid plants can be improved by adding HDACi to the culture medium. Advantageously, species hitherto recalcitrant to haploid embryogenesis via microspore culture are rendered useful when using HDACi. Haploid and double haploid plants are of industrial application in the plant breeding programmes.

Abstract: A switch to haploid embryogenesis is controlled by the activity of histone deacetylases (HDACs). Blocking HDAC activity with HDAC inhibitors (HDACi), e.g., trichostatin A (TSA), in Brassica napus, B. rapa, Arabidopsis thaliana, and Capsicum annuum male gametophytes leads to a large increase in the proportion of cells that undergo embryogenic growth. In B. napus, treatment with one specific HDACi (SAHA) improves the conversion (i.e., germination) of these embryos into seedlings. Existing methods of culturing microspores of angiosperm plants following stress to produce haploid embryos, haploid plants, and double haploid plants can be improved by adding HDACi to the culture medium. Advantageously, species hitherto recalcitrant to haploid embryogenesis via microspore culture are rendered useful when using HDACi. Haploid and double haploid plants are of industrial application in the plant breeding programmes.

Abstract: A switch to haploid embryogenesis is controlled by the activity of histone deacetylases (HDACs). Blocking HDAC activity with HDAC inhibitors (HDACi), e.g. trichostatin A (TSA), in Brassica napus, B. rapa, B. oleracea, Arabidopsis thaliana and Capsicum annuum male gametophytes leads to a large increase in the proportion of cells that undergo embryogenic growth. In B. napus, treatment with one specific HDACi (SAHA) improves the conversion (i.e. germination) of these embryos into seedlings. Existing methods of culturing microspores of angiosperm plants following stress to produce haploid embryos, haploid plants and double haploid plants can be improved by adding HDACi to the culture medium. Advantageously, species hitherto recalcitrant to haploid embryogenesis via microspore culture are rendered useful when using HDACi. Haploid and double haploid plants are of industrial application in the plant breeding programmes.

Abstract: A switch to haploid embryogenesis is controlled by the activity of histone deacetylases (HDACs). Blocking HDAC activity with HDAC inhibitors (HDACi), e.g. trichostatin A (TSA), in Brassica napus, B. rapa, B. oleracea, Arabidopsis thaliana and Capsicum annuum male gametophytes leads to a large increase in the proportion of cells that undergo embryogenic growth. In B. napus, treatment with one specific HDACi (SAHA) improves the conversion (i.e. germination) of these embryos into seedlings. Existing methods of culturing microspores of angiosperm plants following stress to produce haploid embryos, haploid plants and double haploid plants can be improved by adding HDACi to the culture medium. Advantageously, species hitherto recalcitrant to haploid embryogenesis via microspore culture are rendered useful when using HDACi. Haploid and double haploid plants are of industrial application in the plant breeding programmes.

Abstract: The invention provides a method and apparatus for pseudonym generation and authentication. The method comprises the steps of: transmitting a user identity IDuser to a Personal Identity Manager (PIM); receiving a set of public parameters and a prime pseudonym Pprime corresponding to the ID user from the PIM; and selecting at least two random parameters, and generating a sub-pseudonym Ppseu with the at least two random numbers, the set of public parameters, and the prime pseudonym Pprime.