141results about How to "Maintain purity" patented technology

The present invention relates generally to adsorbents for use in pressure swing adsorption (PSA) prepurification processes. The invention more particularly relates to the design of adsorbent zones to be used in PSA prepurification processes that are expected to provide for extensions in PSA cycle time, thereby reducing blowdown loss and operating costs associated with the process. One particular embodiment of the present invention includes a first adsorption zone containing activated alumina and a second adsorption zone of an alumina-zeolite mixture or composite adsorbent in which the volume of the first zone does not exceed 50% of the total volume of the first and second zone.

Aspects of the invention relate to several methods to deposit and regenerate target materials in neutron generators and similar nuclear reaction devices. In situ deposition and regeneration of a target material reduces tube degradation of the nuclear reaction device and covers impurities on the surface of the target material at the target location. Further aspects of the invention include a method of designing a target to generate neutrons at a high efficiency rate and at a selected neutron energy from a neutron energy spectrum.

A specimen collection container includes inner and outer tubes. The inner tube includes a bottom end, a top end, and a sidewall extending therebetween defining an interior. The sidewall includes an inner surface and an outer surface having at least one annular protrusion extending therefrom. The inner tube includes at least one funnel portion adjacent the top end for directing a specimen into the inner tube interior, and an annular ring disposed about a portion of the outer surface of the sidewall adjacent the top end. The outer tube includes a bottom end, a top end, and a sidewall extending therebetween, the sidewall having an outer surface and an inner surface defining an annular recess adapted to receive a portion of the annular protrusion therein. The inner tube is disposed within the outer tube and a portion of the top end of the outer tube abuts the annular ring.

In hydrate-based desalination or other water purification conducted using naturally buoyant or trapped-gas-assisted buoyancy hydrate in a hydrate fractionation column, a portion of fresh or purified product water is extracted from an upper, hydrate dissociation region of the fractionation column and reintroduced into a lower portion of the fractionation column at a point above but generally near a product water / saline water interface. The difference in density between the reintroduced product water and the fluid in the hydrate fractionation column above the point of reintroduction (water, hydrate, and gas) drives a natural circulation system which enhances the rate at which hydrate rises into the hydrate dissociation region.

This invention relates to a vapor or liquid phase reagent dispensing apparatus comprising:a vessel which comprises a removable top wall member, a sidewall member and a bottom wall member configured to form an internal vessel compartment to hold a source chemical up to a fill level and to additionally define an inner gas volume above the fill level;said sidewall member having a protuberance that extends into the internal vessel compartment adjacent to the top wall member;said top wall member and said sidewall member having opposing flat surfaces, wherein the opposing flat surfaces are optionally in contact with one another;fastening means for securing said top wall member to said sidewall member through the opposing flat surfaces that are optionally in contact with one another;said top wall member and said protuberance having opposing flat surfaces, wherein the opposing flat surfaces are not in contact with one another and at least a portion of the opposing flat surfaces are hardened; anda metal seal aligned and in contact with the hardened opposing flat surfaces of said top wall member and said protuberance;wherein said hardened opposing flat surfaces of said top wall member and said protuberance have a hardness greater than the hardness of said metal seal. The dispensing apparatus may be used for dispensing of reagents such as precursors for deposition of materials in the manufacture of semiconductor materials and devices.

The invention is a method of handling groups of services where the makeup of the groups can be determined and changed while the application is running. In one embodiment a group of services switches from peer mode to coordinator cohort mode to perform a task and then switches back. This is mainly accomplished through a group proxy, which is generated at run time, and which handles interactions with groups of services on behalf of one or more clients. The group proxy, buffers calls from a client to a group when the group is unavailable because it is in transition. When the transition is complete the group proxy transmits the stored client commands to the group.

Methods and composition for maintenance of cardiomyocytes are provided. For example, in certain aspects methods including culturing the cardiomyocytes in a medium essentially free of serum or containing dialyzed serum to maintain long-term purity. In further aspects, methods for modulation of cardiomyocytes may be provided.