A metering system (10) meters usage of on-line and off-line services by way of interactive service devices (14). Interactive service devices (14) may include personal computers and non-personal computers. Non-personal computers may include network computers, gaming devices, Internet televisions, Internet telephones, and the like. The on-line service usage may include Internet usage such as which home pages, advertisements, and other Internet resources are accessed by a user. The off-line service usage may include application program usage such as which application programs are executed by a user.

Interactive service device metering systems

Systems and methods are provided for gathering audience measurement data relating to exposure of an audience member to audio data. Audio data is received in a user system and is then encoded with audience measurement data. The encoded audio data is reproduced by the user system, picked up by a monitor and decoded to recover the audience measurement data.

Systems and methods for gathering audience measurement data

The compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electricity provided to the motor. To minimize the initial cost and to minimize operating costs, the variable speed drive is cooled by refrigerant from the refrigeration system which permits the use of a smaller drive, and the variable speed drive is operated at, or approaching, a unity power factor.

Variable speed drive chiller system

A compact, rugged, variable reluctance, variable speed, electric motor capable of producing high torque at high electrical energy conversion efficiencies is provided. The present invention provides for a multi-stage motor design having a number of discreet rotor and stator elements on a common shaft. This configuration provides for the simplest of magnetic structures and produces a powerful magnetic flux modelling design technique that is used to further optimize the motor design and subsequent control logic. Thermal mapping of the magnetic mass provides for advanced cooling techniques that are used to ensure long in-service life in the most extreme of industrial applications. The electric motor inherently provides low vibration thereby greatly reducing noise; low turn to turn voltage potentials thereby eliminating costly phase to phase shorting potential; efficient motor operation through the reduction in switching and copper losses in both the machine and its control system.

Multistage variable reluctance motor/generator

Silicone organic blends for use as lubricating oils, hydraulic fluids, dielectric fluids, coolants, and in compressor or vacuum pump applications, have improved viscosity stability when the polydispersity of the silicone fluids used in these blends, i.e., their molecular weight distribution (M w /M n ), exceeds 1.5. The viscosity rise of the silicone organic blend is less than one centistoke (mm 2 /s) when aged 14 days in an oven at 100° C., compared to viscosity rises of about 1.3 to over 3.5 centistokes (mm 2 /s) for commercial silicone organic blends using silicone fluids with polydispersity less than 1.5.

Silicone oils with improved viscosity stability

A combination of a variable reluctance motor and a screw compressor is provided with a fluid management system that directs a portion of the lubricant flow through the variable reluctance motor to cool its stator laminations and windings Another portion of the lubricant flow is caused to pass directly from a heat exchanger to the screw compressor The first portion of flow, which passes through the variable reluctance motor, is then directed into fluid communication with the inlet of the screw compressor to lubricate the screw compressor and provide cooling for the compressor The portion of lubricant flow passing directly through the heat exchanger to the compressor also provides lubrication for the compressor and is used to further cool the moving parts of the screw compressor

Lewis E. Unnewehr

Papers

Lubricant cooled electric drive motor for a compressor