Abstract: A method for preparing a PET floorboard comprises: hot-melt compounding a printing layer and a wear-resistant layer to obtain a composite layer; providing at least one PET felt panel on the backside of the printing layer of the composite layer, and then performing hot-pressing for fusion attachment and cold-pressing for shaping to obtain a composite panel; coating at least one UV paint layer on the surface of the wear-resistant layer of the composite panel, and then cutting into required sizes and processing edges to obtain the PET floorboard. The PET floorboard provided by the invention has such good flexibility that it will not crack or be defaced when being folded in half around a metal shaft with a diameter of 12.7 mm. Moreover, the PET floorboard is light, has a density of only 700-1000 kg/m3, and has excellent dimensional stability against high and low temperatures and safety.

Abstract: Provided are applications of a thiazole derivative in treating virus infection and in the preparation of drugs for treating virus infection.

Abstract: A controller of a memory system controls a completion rate of commands. The controller receives, from a host, command requests to be processed on a memory device. The controller processes the command requests, determines a first number of completion notifications, which are to be transmitted to the host in a first time interval, among multiple completion notifications associated with the command requests, based on a throughput credit, a set maximum credit, and the number of the multiple completion notifications. The controller transmits, to the host, the first number of completion notifications in the first time interval, and transmits a second number of completion notifications in the second time interval.

Abstract: A controller of a memory system controls a completion rate of commands. The controller receives, from a host, command requests to be processed on a memory device. The controller processes the command requests, determines a first number of completion notifications, which are to be transmitted to the host in a first time interval, among multiple completion notifications associated with the command requests, based on a throughput credit, a set maximum credit, and the number of the multiple completion notifications. The controller transmits, to the host, the first number of completion notifications in the first time interval, and transmits a second number of completion notifications in the second time interval.

Abstract: Provided a method for separating PHA and PHA prepared therefrom. The method comprises the following steps: subjecting a PHA fermentation broth to solid-liquid separation to obtain a thallus precipitate; breaking cell walls of the thallus precipitate, and subjecting obtained wall-broken products to a plate and frame filtration to obtain PHA; a filter cloth for the plate and frame filtration is pre-coated with a PHA layer. The method adopts a plate and frame separation to replace the traditional centrifugal separation to prepare PHA, and the PHA layer is pre-coated on the filter cloth for the plate and frame filtration, thereby overcome the defects in the prior art such as high cost and operational difficulty caused by adopting multiple centrifugal separations; in addition, the method of the present disclosure also exhibits the advantages of high recovery rate of PHA and high purity of the prepared PHA product.

Abstract: The present invention relates to the field of high polymer material manufacturing, and discloses an air-isolated continuous feeding system for synthesizing polylactic acid from lactide and a feeding method thereof. The continuous feeding system comprises a raw material bag/box and a raw material collector for collecting and outputting lactide, the raw material bag/box is connected with a shielding gas input pipeline, a discharge pipe is movably inserted into the raw material bag/box, a cyclone separator is connected downstream of the discharge pipe, and a solid substance outlet of the cyclone separator is connected with the raw material collector. According to the invention, deterioration of the lactide raw material incurred by moisture absorption and oxidation is avoided, and the reaction conversion ratio and final product purity are improved. The continuous feeding system is easy to operate, can save manpower and material resources, and is applicable to industrial application.

Abstract: The present invention relates to the field of high polymer material manufacturing, and discloses an air-isolated continuous feeding system for synthesizing polylactic acid from lactide and a feeding method thereof. The continuous feeding system comprises a raw material bag/box and a raw material collector for collecting and outputting lactide, the raw material bag/box is connected with a shielding gas input pipeline, a discharge pipe is movably inserted into the raw material bag/box, a cyclone separator is connected downstream of the discharge pipe, and a solid substance outlet of the cyclone separator is connected with the raw material collector. According to the invention, deterioration of the lactide raw material incurred by moisture absorption and oxidation is avoided, and the reaction conversion ratio and final product purity are improved. The continuous feeding system is easy to operate, can save manpower and material resources, and is applicable to industrial application.

Abstract: Provided a method for separating PHA and PHA prepared therefrom. The method comprises the following steps: subjecting a PHA fermentation broth to solid-liquid separation to obtain a thallus precipitate; breaking cell walls of the thallus precipitate, and subjecting obtained wall-broken products to a plate and frame filtration to obtain PHA; a filter cloth for the plate and frame filtration is pre-coated with a PHA layer. The method adopts a plate and frame separation to replace the traditional centrifugal separation to prepare PHA, and the PHA layer is pre-coated on the filter cloth for the plate and frame filtration, thereby overcome the defects in the prior art such as high cost and operational difficulty caused by adopting multiple centrifugal separations; in addition, the method of the present disclosure also exhibits the advantages of high recovery rate of PHA and high purity of the prepared PHA product.

Abstract: A method for efficiently producing PHA comprising: inoculating PHA fermentation strains into a fermentation medium for fermentation under the condition of being capable of producing PHA through fermentation; subjecting the fermentation broth to a solid-liquid separation to obtain fermentation supernatant and thallus precipitate; breaking the cell walls of the thallus precipitate, and subjecting the wall-broken products to a plate and frame filtration to prepare PHA; pre-coating a filter cloth for the plate and frame filtration with a PHA layer; at least part of the water of the fermentation medium is PHA process wastewater. The method utilizes the PHA process wastewater as at least part of the water of the fermentation medium, and filters and separates the broken thallus with the plate and frame filtration equipment pre-coated with PHA layer to prepare PHA, thereby recycling the high-salt wastewater, reducing costs, and potentially separating PHA on a large scale for industrial production.

Abstract: The present disclosure relates to the technical field of polymer material, and discloses a device and method for online preparation of a modified polylactic acid material with a polylactic acid melt. The device comprises a twin-screw extruder, a first solid modifier hopper, a polylactic acid melt pipeline and a polylactic acid melt feedstock metering pump, wherein the first solid modifier hopper is connected with Zone I of the twin-screw extruder, the polylactic acid melt pipeline is connected with Zone IV of the twin-screw extruder. The method for online preparation of modified polylactic acid material with the device can avoid degradation of the polylactic acid caused by the secondary processing, improve mechanical property of the prepared polylactic acid and reduce production cost.

Abstract: The present disclosure relates to the technical fields of genetic engineering and microbial fermentation, and discloses a recombinant strain for producing L-lactic acid, wherein the recombinant strain is obtained by genetically modifying a starting strain, the activity of D-lactate dehydrogenase of the recombinant strain is weakened or inactivated, and the activity of L-lactate dehydrogenase is enhanced, as compared with the starting strain. The present invention can significantly improve the fermentation effect, the yield of the L-lactic acid and the optical purity of the product L-lactic acid.

Abstract: The present disclosure relates to the technical field of biotechnology and polymer synthesis, and discloses a method for producing polylactic acid, the method comprises the following steps: (i) inoculating a lactic acid fermentation strain into a lactic acid fermentation culture medium to perform a fermentation, so as to obtain a fermentation broth containing lactate; (ii) separating the fermentation broth to obtain a lactic acid; (iii) synthesizing a polymer-grade lactide by using the lactic acid as a raw material; (iv) subjecting the polymer-grade lactide to a polymerization reaction in a polymerization reaction device to obtain a polylactic acid. Through the above technical solution, the polylactic acid can be efficiently produced in the present disclosure.

Abstract: The present invention relates to the technical field of polylactic acid preparation, and discloses polylactic acid polymerization reaction apparatus and system. The polylactic acid polymerization reaction apparatus comprises a polymerization reactor and an agitating assembly arranged in a flow channel of the polymerization reactor, wherein the agitating assembly comprises an electromagnetic winding mechanism and a magnetic induction element, the electromagnetic winding mechanism is arranged along the inner wall of the polymerization reactor around the magnetic induction element, with clearance formed between the electromagnetic winding mechanism and the magnetic induction element, so that the magnetic induction element and the electromagnetic winding mechanism can induce electromagnetic induction, and thereby the magnetic induction element can rotate around its own axis; a threaded groove is formed on the magnetic induction element.

Abstract: The present invention relates to the field of devolatilization, and discloses a polylactic acid devolatilization evaporator, which comprises: a container comprising a cylinder; an agitating shaft coaxial with the cylinder; an agitating belt connected to the agitating shaft and arranged in a spiral shape around the central axis of the cylinder, comprising an outer belt surface facing the inner circumferential surface of the cylinder and spaced apart from the inner circumferential surface of the cylinder. With the above technical scheme, the agitating belt makes the materials distributed more uniformly on the inner circumferential surface of the cylinder and form a thin layer in uniform thickness, thereby avoids agglomeration of the materials, facilitates uniform heating of the materials, avoids deterioration (e.g., darkened color) of the materials owing to non-uniform heating of the materials and excessive retention time in a high-temperature environment, and improves product quality.

Abstract: Provided a complex bacteria for improving the corn steeping effects and usage thereof. The complex bacteria comprises strains capable of producing protease, cellulase and hemicellulase. Using the complex bacteria to steep corn, effects of reducing the addition amount of SO2, shortening the steeping time and improving the starch yield are achieved.

Abstract: A preparation method of a loose lay plastic floor includes the following steps: (a) subjecting a wear layer, a printing layer, a semi-rigid PVC layer, a core layer and an adsorption layer to hot-melt compounding and shaping to obtain a composite board; (b) coating one or more layers of UV coating on a surface of the wear layer of the composite board; and (c) subjecting the composite board coated with the UV coating to tempering, conditioning and punching to obtain a loose lay plastic floor. The core layer is a stone plastic core (SPC), a wood plastic core (WPC), a high density fiberboard (HDF), or a medium density fiberboard (MDF).

Abstract: A data processing system includes a host device and a memory system including a plurality of units. The host device includes a workload generation component and an analysis component. The workload generation component concurrently transmits, to the memory system, a plurality of commands for the plurality of memory units. The analysis component receives, from the memory system, command completion messages corresponding to the plurality of commands; measures latencies of the plurality of commands based on the receiving of the command completion messages; and analyze a parallelism scheme of the plurality of memory units based the measured latencies.

Abstract: The present disclosure provides a method for domesticating Saccharomyces cerevisiae which is resistant to fermentation inhibitors, high temperature and high concentration of ethanol. The method comprises a primary domestication and a secondary domestication of the S. cerevisiae, wherein the primary domestication comprises the steps of replacing the fermented mash with fresh liquefied mash and continuing fermentation when the ethanol content in the fermented mash reaches a higher concentration (>12% (v/v)), the replacement is performed for at least 20 times, and the time interval of replacements is 20-30 hours; the secondary domestication comprises the steps of performing high-temperature domestication on the primary domesticated strain by a temperature gradient and replacing the fermented mash for multiple times, wherein the temperature is raised by 0.5° C.-2° C. every 18-24 times of replacement. The domesticated S.

Abstract: The present disclosure provides a method for continuously producing starch saccharification products by using high-concentration starch milk.

Abstract: A preparation method of a loose lay plastic floor includes the following steps: (a) subjecting a wear layer, a printing layer, a semi-rigid PVC layer, a core layer and an adsorption layer to hot-melt compounding and shaping to obtain a composite board; (b) coating one or more layers of UV coating on a surface of the wear layer of the composite board; and (c) subjecting the composite board coated with the UV coating to tempering, conditioning and punching to obtain a loose lay plastic floor. The core layer is a stone plastic core (SPC), a wood plastic core (WPC), a high density fiberboard (HDF), or a medium density fiberboard (MDF).