A mixing device including a container defining a container cavity, the container including a bottom wall supporting a hollow shaft, the shaft supporting an impeller thereon such that the impeller is free to rotate about the shaft, the impeller including a central passageway therethrough for receiving the shaft, the container further including an elongated evacuation tube having a first end positioned within the passageway of the shaft and an opposed second end extending to a port of the container. Methods of using the mixing device to provide improved cell culture.

An animal trap sensor includes a base having a distal end and a proximal end, a switch having a first metallic element and a second metallic element, and a signal unit, in which, when the first metallic element contacting the second metallic element, thereby forming a closed circuit, such that the signal unit transmits a signal to an off-site receiver. Or, an animal trap sensor includes a first portion and a second portion electrically connected with a signal unit including a power supply, in which, when the first and the second portions are disposed at a first distance between each other, thereby generating an output property, in which, when the first and the second portions are disposed at a second distance between each other, which is different from the first distance, thereby changing the output property and causing the signal unit to transmit a signal to an off-site receiver.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems. The treatment fluid can comprise a water-based fracturing fluid or a waterless liquefied petroleum gas (LPG) fracturing fluid.

A dispersing device includes: a casing having a liquid inlet; a rotating body accommodated in the casing and pivotably attached to a rotating shaft from one end of the rotating body; a liquid channel having, on the other end of the rotating body, a passage through which the liquid from the liquid inlet passes, and , inside the rotating body, a segment extended radially around the rotating shaft toward an outer side perpendicular to the rotating shaft and from the other end of the rotating body toward the one end of the rotating body in a direction of the rotating shaft axis and in which a cross section shape perpendicular to the rotating shaft is annular; and one connecting hole in the rotating body connecting the liquid channel with the exterior of the rotating body downstream of the liquid channel.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems.

The present invention provides a method and system for providing on-site electrical power to a fracturing operation, and an electrically powered fracturing system. Natural gas can be used to drive a turbine generator in the production of electrical power. A scalable, electrically powered fracturing fleet is provided to pump fluids for the fracturing operation, obviating the need for a constant supply of diesel fuel to the site and reducing the site footprint and infrastructure required for the fracturing operation, when compared with conventional systems.

A photo-resistor draw device includes a photo-resistor bottle, a sealing cover arranged on an inlet of the bottle, an air tube passing through the sealing cover and being inserted within the photo-resistor bottle, and a photo-resistor draw tube. The photo-resistor bottle further includes a stirring component for stirring the photo-resistors. As the novel photo-resistor draw device includes the stirring component for preventing the high-precision photo-resistor from being subsided. Not only the stability of the color filter products may be enhanced, but also the defects may be eliminated. As such, the yield rate of the products is improved.