Abstract: The invention relates to methods of production of a silica concentrate from geothermal fluids. More particularly, although not exclusively, the invention relates to the production of a colloidal silica concentrate, colloidal silica or precipitated silica from high temperature geothermal fluids by ultrafiltration to produce size-specific silica colloids and step-wise concentration of silica to avoid precipitation or gelling.

Abstract: A test assembly for testing electrical performance of microcircuits contained in leadless packages has Kelvin contacts. Slider contacts in a plurality of contact assemblies slide compliantly to accommodate lack of coplanarity in terminals on the package. A resilient elastomeric block may be inserted through interior spaces of the contact assembly and in interfering relation with features of a housing that supports and aligns the contact assemblies, to apply force to the slider contacts to force them against the microcircuit terminals.

Abstract: A test assembly for testing electrical performance of microcircuits contained in leadless packages has Kelvin contacts. Slider contacts in a plurality of contact assemblies slide compliantly to accommodate lack of coplanarity in terminals on the package. A resilient elastomeric block may be inserted through interior spaces of the contact assembly and in interfering relation with features of a housing that supports and aligns the contact assemblies, to apply force to the slider contacts to force them against the microcircuit terminals.

Abstract: A grounding assembly for testing which can be readily changed is provided by an insert which is retained within an opening in a test socket. Flexible projections from the socket fit within grooves in the insert to provide the retention means. The insert is positioned within an opening in the socket adjacent to an opening containing a device under test (DUT). The insert is also between the DUT and a test board, and has contacts arranged such they connect ground contacts on the DUT to opposing contacts on the test board. The insert can provide different numbers, arrangements, and types of contacts as well as different materials for both the contact and contact body by merely changing the insert.

Abstract: A grounding assembly for testing which can be readily changed is provided by an insert which is retained within an opening in a test socket. Flexible projections from the socket fit within grooves in the insert to provide the retention means. The insert is positioned within an opening in the socket adjacent to an opening containing a device under test (DUT). The insert is also between the DUT and a test board, and has contacts arranged such they connect ground contacts on the DUT to opposing contacts on the test board. The insert can provide different numbers, arrangements, and types of contacts as well as different materials for both the contact and contact body by merely changing the insert.