Abstract: A method for preparing a nanofiltration membrane and a nanofiltration membrane prepared therefrom, the method comprising the following steps: dissolving a polymer in a solvent to prepare a polymer solution, and curing the polymer solution on a support material to form a base membrane; sequentially applying a first liquid-phase solution and a second liquid-phase solution on the base membrane to form a nascent membrane; densifying the nascent membrane by using a solution that contains an alkaline substance; processing the densified nascent membrane by using a solution that contains an acidic substance; and obtaining the nanofiltration membrane after post-processing and drying.

Abstract: Thermoplastic films are disclosed that are suitable for use as auto wraps. The films include a thermoplastic polyurethane layer comprising a thermoplastic polyurethane polymer and a patterned adhesive layer. The thermoplastic films, when tested by a 25% Heat Relaxation Test at a thickness of about 0.006 inches, exhibit a final load from about 0.02 to about 0.3 pounds force; and when tested by a 25% Elastic Recovery test, exhibit a residual strain at one minute of 2% or greater.

Abstract: A correction method for a microseism interpretation fracturing fracture parameter result. The method includes classifying the communication modes of a block sampling fractured wells to be corrected according to the matching degree of micro seismic monitoring result and sand adding amount; correcting the volume coefficient of each said classified fractured well single well, and the volume correction coefficient Bv of each said fractured well is: B v = [ L 5 / 4 ? H ] T [ L 5 / 4 ? H ] W , wherein, [L5/4H]W is a calculation value of a micro seismic monitoring interpretation result; [L5/4H]T is a theoretical calculation value obtained by using field construction parameters; C, calculating the classification volume correction coefficient of each class of fractured wells according to the calculated single well volume correction coefficient of each said fractured well.

Abstract: Thermoplastic polyurethane compositions are disclosed, comprising: a thermoplastic polyurethane polymer or polymer blend comprising the reaction product of: an aliphatic diisocyanate, an aliphatic polyol, and a chain extending agent, wherein the thermoplastic polyurethane composition: when tested by a 25% Heat Relaxation Test at a thickness of about 0.006 inches, exhibits a final load from about 0.02 to about 0.3 pounds force; and when tested by a 25% Elastic Recovery test, exhibits a residual strain at one minute of 2% or greater.

Abstract: Thermoplastic films are disclosed that are suitable for use as auto wraps. The films include a thermoplastic polyurethane layer comprising a thermoplastic polyurethane polymer and a patterned adhesive layer. The thermoplastic films, when tested by a 25% Heat Relaxation Test at a thickness of about 0.006 inches, exhibit a final load from about 0.02 to about 0.3 pounds force; and when tested by a 25% Elastic Recovery test, exhibit a residual strain at one minute of 2% or greater.

Abstract: Thermoplastic films are disclosed that are suitable for use as paint protection films. The films include a thermoplastic polymer layer comprising a thermoplastic polyurethane polymer and a polyvinyl acetal polymer. The films further comprise an adhesive layer. The thermoplastic films, when tested by ASTM D-412, exhibit a stress at 5% strain of no greater than 200 psi.

Abstract: The present disclosure relates to a composite reverse osmosis membrane and a preparation method therefor. The preparation method of the present disclosure can realize the preparation of a composite reverse osmosis membrane having a high flux, a high desalinization rate, a high deboration rate and high contamination resistance in a simple operation and high reaction efficiency manner.

Abstract: Described are a water quality testing method and a water quality testing apparatus. The testing method includes: obtaining, in a first environment, a testing sample including a target testing object; selecting a reference object according to the testing sample, and respectively acquiring the chroma of the reference object in a second environment and in the first environment; constructing a correction model according to the chroma of the reference object in the second environment and in the first environment; obtaining the chroma of the testing sample in the first environment; according to the chroma of the testing sample in the first environment and the correction model, obtaining the chroma of the testing sample in the second environment; and according to a preset standard curve and the chroma of the testing sample in the second environment, obtaining the concentration of the target testing object in the testing sample.

Abstract: Thermoplastic films are disclosed that are suitable for use as auto wraps. The films include a thermoplastic polyurethane layer and a patterned adhesive layer. The thermoplastic films, when tested by a 25% Heat Relaxation Test at a thickness of about 0.006 inches, exhibits a final load from about 0.02 to about 0.3 pounds force; and when tested by a 25% Elastic Recovery test, exhibits a residual strain at one minute of 2% or greater.

Abstract: Thermoplastic films are disclosed that include a thermoplastic polymer layer comprising a thermoplastic polyurethane polymer and a copolyester polyether polymer, and a patterned adhesive layer. The thermoplastic films, when tested by a 25% Heat Relaxation Test at a thickness of about 0.006 inches, exhibits a final load from about 0.02 to about 0.3 pounds force; and when tested by a 25% Elastic Recovery test, exhibits a residual strain at one minute of 2% or greater.

Abstract: For a system of adjusting a speed of an electric tool, a power supply module is connected to an inverter, the inverter is connected to a motor and a controller; the controller is connected to a switch fixed-speed module, a rotational speed display module, and a fixed-speed prompting module. The switch fixed-speed module comprises a switch trigger connected to the controller and is configured to set a target operating speed of the motor based on the amount of turned-on stroke of the switch trigger. The rotational speed displaying module is configured to display a preset operating speed of the motor. The fixed-speed prompting module is configured to prompt a setting state of the target operating speed.

Abstract: Compatibility in polymer compounds is determined by the kinetics of mixing and chemical affinity. Compounds like reinforcing filler/elastomer blends display some similarity to colloidal solutions in that the filler particles are close to randomly dispersed through processing. Applying a pseudo-thermodynamic approach takes advantage of this analogy between the kinetics of mixing for polymer compounds and true thermally driven dispersion for colloids. The results represent a new approach to understanding and predicting compatibility in polymer compounds based on a pseudo-thermodynamic approach.

Abstract: A method of preparing epoxypropane by direct epoxidation of propylene includes the steps of contacting a mixed gas consisting of a reaction feed gas and a diluent gas with a catalyst to carry out reaction under reaction conditions of propylene epoxidation to prepare epoxypropane. The reaction feed gas contains propylene, oxygen gas and hydrogen gas while at least a portion of the diluent gas is a gaseous olefin. Using gaseous olefin as at least a portion of the diluent gas to perform propylene epoxidation that can significantly extend service life of the catalyst, effectively reduce the used amount of diluent gas, and improve the reaction selectivity and propylene conversion rate.

Abstract: An electrostatic discharge (ESD) protection circuit includes an ESD detector connected between a pad and a first power source and configured to generate a detection signal when ESD is detected at the pad, a switch transistor including a gate controlled by the detection signal and a source and a drain connected between the pad and the memory, and a leakage current prevention circuit including a first transistor including a first gate connected to a second power source and a source and a drain connected between the pad and a first node, and a second transistor including a second gate connected to the pad and a source and a drain connected between the first node and the second power source. The first node is connected to or in electrical communication with a bulk node of the switch transistor.

Abstract: Magnetic microcarrier beads have a particle size of 1 to 1000 micrometers and include a composite core and a polymer coating that surrounds and encapsulates the core. The composite core includes magnetic particles embedded within an indigestible polymer matrix. The coating is a digestible or indigestible polymer that facilitates cell adhesion to the surface of the beads during cell culture. Magnetic force can be used to agitate the microcarrier beads during cell culture as well as to separate the beads from cultured cells or processed bio-media.

Abstract: A flash device and a manufacturing method thereof. The method comprises: providing a substrate, and forming, on the substrate, a floating gate polycrystalline layer, a floating gate oxide layer, and a tunneling oxide layer; wherein the floating gate polycrystalline layer is formed on the substrate, the floating gate oxide layer is formed between the substrate and the floating gate polycrystalline layer, a substrate region at one side of the floating gate polycrystalline layer is a first substrate region, a substrate region at the other side of the floating gate polycrystalline layer is a second substrate region; forming, on the tunneling oxide layer, located in the first substrate region, a continuous non-conductive layer, the non-conductive layer extending to the tunneling oxide layer at a side wall of the floating gate polycrystalline layer; and forming, on the tunneling oxide layer, a polysilicon layer.

Abstract: The present disclosure provides a camera module and an optical lens thereof, an optical lens element and a manufacturing method therefor, and a method for assembling a large wide-angle camera module, wherein the camera module comprises a lens and a photosensitive assembly. The lens comprises a lens barrel, at least one first lens element unit and at least one second lens element unit, and is further provided with at least one notch, wherein the first lens element unit and the second lens element unit are disposed in the lens barrel, and the first lens element unit is configured as a non-rotating body, and wherein the notch is provided in the lens barrel, or the notch is formed in the first lens element unit, or the notch is formed in the second lens element unit, and the first lens element unit is marked by means of the notch.

Abstract: Provided are a camera module, a camera lens with a mark and a manufacturing method thereof, and an assembly method of an extra-wide-angle camera module. The camera module includes a camera lens and a photosensitive assembly. The camera lens includes a lens tube, at least one first lens unit, at least one second lens unit and at least one mark element. The first lens unit and the second lens unit are provided in the lens tube. The first lens unit is a non-rotational member. The mark element is provided at the lens tube, and is used to position the first lens unit.

Abstract: A method for preparing a nanofiltration membrane and a nanofiltration membrane prepared therefrom, the method comprising the following steps: dissolving a polymer in a solvent to prepare a polymer solution, and curing the polymer solution on a support material to form a base membrane; sequentially applying a first liquid-phase solution and a second liquid-phase solution on the base membrane to form a nascent membrane; densifying the nascent membrane by using a solution that contains an alkaline substance; processing the densified nascent membrane by using a solution that contains an acidic substance; and obtaining the nanofiltration membrane after post-processing and drying.

Abstract: An electrostatic discharge (ESD) protection circuit includes an ESD detector connected between a pad and a first power source and configured to generate a detection signal when ESD is detected at the pad, a switch transistor including a gate controlled by the detection signal and a source and a drain connected between the pad and the memory, and a leakage current prevention circuit including a first transistor including a first gate connected to a second power source and a source and a drain connected between the pad and a first node, and a second transistor including a second gate connected to the pad and a source and a drain connected between the first node and the second power source. The first node is connected to or in electrical communication with a bulk node of the switch transistor.