Abstract: Methods for removing impurities from precursors and related systems are provided. A method comprises at least one thermal cycle. The at least one thermal cycle comprises one or more of the following steps: heating a vessel comprising a precursor and at least one impurity to a temperature for a duration sufficient to vaporize at least a portion of the at least one impurity; measuring a vapor pressure within the vessel to obtain a measured vapor pressure and comparing the measured vapor pressure to a set point vapor pressure; and when the measured vapor pressure is above or within the set point vapor pressure, removing, from the vessel, at least a portion of a vapor comprising the at least one impurity. Other methods and systems are provided herein.

Abstract: The present disclosure provides an acoustical substrate including nonwoven material which includes a two component adhesive system which may be treated with a fluid repelling compound. The two component adhesive system may comprise two adhesive components having different melting points to allow for flexible industrial post processing and laminating. The adhesives may be applied by a variety of methods and may exist in the substrate in, e.g., either discrete or continuous web forms.

Abstract: A plurality of self-supporting first and second panels are disposed in alternating arrangement along the length of an open tank. A seal is provided around the perimeter of the cover and along the joint between each of the first and second panels. Each of the first and second panels is provided with a handle at the end of each of the panels that, when in a stored position, lies flush with a walking surface provided on the top of the cover.

Abstract: A filter system for removing a material from a layer of water of selected depth beginning at the surface of a body of water. The system is designed to be mounted to a surface vessel specially adapted to receive the system. The surface vessel has an intake area at its bow. A water intake gate acts as a closure to the intake area. The inlet gate can be lowered to admit water to the intake area as the vessel is propelled through the body of water. An endless conveyer type filter screen is supported by rollers in the intake area. Water passing through the filter screen is discharged through ducts passing through the sides of the vessel. Material separated from the water is conveyed by the filter screen to other equipment for further processing.