Abstract: A filled epoxy tubesheet comprises an epoxy filled with a metal, such as aluminum flakes. Embodiments of the filled epoxy tubesheets can bend due to stress on the surface rather than crack. Embodiments of the filled epoxy tubesheet can be used to improve Air Separation Module performance by reducing or eliminating leakage through crack in the tubesheet.

Abstract: A gas separation membrane comprises a blend of polyethersulfone (PES) and aromatic polyimide polymers that may comprise a plurality of first repeating units of formula (I), wherein X1, X 2 and X3 are herein defined.

Abstract: A filled epoxy tubesheet comprises an epoxy filled with a metal, such as aluminum flakes. Embodiments of the filled epoxy tubesheets can bend due to stress on the surface rather than crack. Embodiments of the filled epoxy tubesheet can be used to improve Air Separation Module performance by reducing or eliminating leakage through crack in the tubesheet.

Abstract: A chemical detector for detecting predetermined chemicals. The chemical detector includes an optical fiber and a polymer having a high fractional free volume higher than about 0.1 that clads a length of the optical fiber. The optical fiber is arranged within an optical resonator. The chemical detector further includes a coherent light source that excites the optical resonator and a chemical signature detector that detects a predetermined chemical based upon a change in a resonance attenuation or refractive index of the optical fiber caused by absorption of the predetermined chemical into the high intrinsic microporosity polymer cladding of the fiber.

Abstract: A chemical detector for detecting predetermined chemicals. The chemical detector includes an optical fiber and a polymer having a high fractional free volume higher than about 0.1 that clads a length of the optical fiber. The optical fiber is arranged within an optical resonator. The chemical detector further includes a coherent light source that excites the optical resonator and a chemical signature detector that detects a predetermined chemical based upon a change in a resonance attenuation or refractive index of the optical fiber caused by absorption of the predetermined chemical into the high intrinsic microporosity polymer cladding of the fiber.

Abstract: A process for removal of carbon dioxide from air using lithium-exchanged X-zeolites at low carbon dioxide partial pressures is provided. The process is particularly useful in applications where fresh air is not available and exhaled air needs to be recycled. An apparatus for carrying out the process is also provided.

Abstract: A photoelectrocatalytic sensor system for measuring oxidizable impurities in air. The sensor system may include a transistor having an electrode and a channel for the flow of current, a photocatalytic material coated onto the electrode of the transistor, a light source for producing an ultraviolet light beam onto the photocatalytic material, and a sensor for measuring the flow of current.

Abstract: Novel splice variants of the human H4 histamine receptor are described. The splice variants have delections of portions of the N-terminal of the wild type H4 receptor. The splice variants are useful in methods for identifying agonists, inverse agonists or antagonists of histamnie action at the H4 receptor.

Abstract: Novel splice variants of the human H3 histamine receptor are described. The splice variants have deletions of portions of the N-terminal of the wild type H3 receptor. The splice variants are useful in methods for identifying agonists, inverse agonists or antagonists of histamine action at the H3 receptor.

Abstract: An air quality system comprising at least one air cleaner unit in communication with an interior air space. In one embodiment, an air quality system for an aircraft comprises a first set of air cleaner units in communication with a lower plenum of the aircraft recirculation system and a second set of air cleaner units in communication with an upper plenum of the aircraft recirculation system. Each air cleaner unit comprises at least one adsorbent unit in combination with at least one photocatalytic oxidation unit. In one embodiment, an air cleaner unit comprises a relatively weak adsorbent material upstream from a photocatalytic oxidation unit, and a relatively strong adsorbent material downstream from the photocatalytic oxidation unit. Methods for removing a pollutant from an air stream and for making an air cleaner unit are also disclosed.

Abstract: The present invention provides a process for recovering sulfur hexafluoride ("SF.sub.6 ") from a gas stream using membrane separation.