Abstract: A processing method of natural rubber latex using creaming includes the following steps: adding a surfactant, a pH adjuster, and deionized water to natural rubber latex, adding a preservative and a creaming agent, mixing and standing a resulting mixture until phase separation occurs, and collecting an upper rubber latex phase and a lower skim latex phase, separately; diluting the upper rubber latex phase with deionized water, adding a preservative, a pH adjuster, a surfactant, and a creaming agent, mixing and standing a resulting mixture until phase separation occurs, and collecting an obtained upper rubber latex phase; and adding a preservative, a pH adjuster, a surfactant, and a creaming agent to an obtained lower skim latex phase, mixing and standing a resulting mixture until phase separation occurs, and collecting an obtained upper rubber latex phase.

Abstract: Methods and systems are provided for improving user authentication and access control by a network file system service in a multi-tenant public cloud environment by receiving a request for a connection to a file system from a file system client (client), sending an identification request for identification authentication of the client to a control system, receiving a response from the control system, establishing the connection to the file system upon determining that the connection to the file system is allowed based on cloud tenant information associated with the client, receiving an attempt to access the file system from the client by a sub-user, authenticating the sub-user based on the cloud tenant information, issuing a security token including a globally unique sub-user identifier of the sub-user, and using the security token to determine access rights of the sub-user to the file system for a subsequent request.

Abstract: A processing method of natural rubber latex using creaming includes the following steps: adding a surfactant, a pH adjuster, and deionized water to natural rubber latex, adding a preservative and a creaming agent, mixing and standing a resulting mixture until phase separation occurs, and collecting an upper rubber latex phase and a lower skim latex phase, separately; diluting the upper rubber latex phase with deionized water, adding a preservative, a pH adjuster, a surfactant, and a creaming agent, mixing and standing a resulting mixture until phase separation occurs, and collecting an obtained upper rubber latex phase; and adding a preservative, a pH adjuster, a surfactant, and a creaming agent to an obtained lower skim latex phase, mixing and standing a resulting mixture until phase separation occurs, and collecting an obtained upper rubber latex phase.

Abstract: The present invention provides a preparation method of tobacco sheets with a reduced quantity of wood pulp fibers, and belongs to the technical field of reconstituted tobacco. The method includes the steps of: cooking tobacco stem materials by alkaline process, and filtering and washing the cooked tobacco stem materials to obtain tobacco stem fibers; generating mixed pulp by mixing wood pulp fibers, tobacco pulp, filling materials, water and the tobacco stem fibers together as per certain proportions, and subjecting the mixed pulp to a papermaking process in a paper machine to obtain tobacco sheets. By means of adding tobacco stem fibers, the present invention effectively reduces the quantity of wood pulp fibers, ensures the continuous operation of the paper machine, and effectively improves the bulk and tensile index of prepared tobacco sheets.

Abstract: The invention disclosed a pigment having angle dependence of the interference colors and its production process, in which mica is used as the substrate and the first metal oxide coating with high refractive index has the optical thickness of silver to golden interference color. And the second metal oxide coating with low refractive index has the optical thickness of the second circle green to the fourth circle interference color. The third coating is a highly refractive metal oxide. The lowly refractive metal oxide is SiO2 and the highly refractive metal oxide is TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, Cr2O3 or their mixtures as well as complexes. The mica substrate is wet-milled mica powders with a thickness of 0.1-0.9 micrometers and a diameter of 5-250 micrometers.

Abstract: A method of preparing a pigment exhibiting a color-shifting effect, including at least heating mica powder suspension in water, adjusting the pH value of the mixture to between 2 and 9, adding a first inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 6 and 14, adding a second inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 2 and 9, adding a third inorganic salt solution, maintaining the pH value of the mixture constant, and stirring the mixture at constant temperature.

Abstract: A method of preparing a pigment exhibiting a color-shifting effect, including at least heating mica powder suspension in water, adjusting the pH value of the mixture to between 2 and 9, adding a first inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 6 and 14, adding a second inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 2 and 9, adding a third inorganic salt solution, maintaining the pH value of the mixture constant, and stirring the mixture at constant temperature.

Abstract: The invention discloses multilayer allochroic pigments having angle dependence of the interference colors and the production processes thereof, in which a synthetic flake of silicate is used as the substrate, and a metal oxide coating with refractive index of more than 1.8 and an oxide coating with refractive index of less than 1.8 are deposited alternately on a surface of the flake of silicate, the number of the coatings is at least three, and said oxide coating with refractive index of less than 1.8 always lies between two metal oxide coatings with refractive index of more than 1.8. The processes involve a wet chemical hydrolysis step to alternately deposit said oxide coating with high refractive index and said oxide coating with high refractive index on the surface of the flake of silicate. The present pigments, which exhibit different strong interference colors as observed at different view angles, could be produced at a low cost and by a simple process.

Abstract: The invention disclosed a pigment having angle dependence of the interference colors and its production process, in which mica is used as the substrate and the first metal oxide coating with high refractive index has the optical thickness of silver to golden interference color. And the second metal oxide coating with low refractive index has the optical thickness of the second circle green to the fourth circle interference color. The third coating is a highly refractive metal oxide. The lowly refractive metal oxide is SiO2 and the highly refractive metal oxide is TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, Cr2O3 or their mixtures as well as complexes. The mica substrate is wet-milled mica powders with a thickness of 0.1-0.9 micrometers and a diameter of 5-250 micrometers.