Abstract: A ventilation system includes one or more exhaust fans and one or more make up air fans. Each fan has is driven by a motor operating at a constant speed. Each fan and motor are coupled by a torque converter, so that the torque applied to the fan is constant. Exhaust fan speed varies according to the ideal gas law, whereby the fan speed automatically varies in response to changes in system conditions, such as temperature and the associated changes in air density and resistance to the fan.

Abstract: An optical fiber attenuator for adjusting the attenuation of a fiber optic cable, including a generally L-shaped housing with a spring clip positioned within the housing. The spring clip is adjustably positioned to change and hold the radius of curvature of a fiber optic cable wrapped around the spring clip. The fiber optic attenuator is fitted with a movable arm mounted to its housing which engages and adjusts the spring clip through a plurality of positions to adjust the position of the spring clip, thereby adjusting the attenuation of the fiber optic cable.

Abstract: An optical fiber attenuator for adjusting the attenuation of a fiber optic cable, including a generally L-shaped housing with a spring clip positioned within the housing. The spring clip is adjustably positioned to change and hold the radius of curvature of a fiber optic cable wrapped around the spring clip. The fiber optic attenuator is fitted with a movable arm mounted to its housing which engages and adjusts the spring clip through a plurality of positions to adjust the position of the spring clip, thereby adjusting the attenuation of the fiber optic cable.

Abstract: A hard drive encapsulating apparatus includes a housing having an air flow channel and an air flow port. Also, a sound suppression cavity is positioned between the channel and the port. A sound suppression material is mounted in the sound suppression cavity.

Abstract: A fan mounting arrangement (10) includes at least one mounting member (14). Each mounting member (14) includes a resilient outer element (19) and an inner element (18) made from a substantially rigid material. The mounting members (14) are all arranged to extend generally parallel to each other. Each mounting member (14) is adapted to be received in a corresponding mounting receptacle (31) associated with a fan housing (11). Once the fan (11) is placed over the mounting members (14) with each mounting member received in its respective mounting receptacle (31), a retaining arrangement retains the fan in the installed position on the mounting members. In this installed position, the resilient elements (19) absorb vibrations from the fan (11) to mechanically isolate the fan from the remainder of the system.

Abstract: A process and apparaus for recovery water from raw sewage extracted directly from the sewer including a screen(2) operable to obtain from raw sewage a screened effluent having a maximum particle size of no more than 900 microns. The apparatus also comprises a first membrane separator(5) which is operable to filter the suspended solids from some or all of the screened effluent. The process also includes a second membrane separator preferably in the form of reverse osmosis filter(8).

Abstract: A process for maintaining a high rate of mass transfer of nutrients contained in a liquid feed stream to a biofilm of microorganisms supported on a bed of particulate matter. The microorganisms in the biofilm are subjected to a continuous, uniform flow of the liquid feed steam and a countercurrent flow of respiratory air so as to support biofilm growth. The bed is periodically pulsed with air at a pressure sufficient to shed microorganisms from the biofilm, and at intervals sufficient to avoid preferential channeling of the liquid feed steam through the bed and/or to disrupt and rearrange the bed of particulate matter.

Abstract: A system for eliminating turbulence in aerodynamic surfaces, such as engine nacelles, resulting from air passing over joints and gaps in the aerodynamic surface. Basically, this system includes a suction chamber within the nacelle and extending along the inner skin wall adjacent to gaps or joints, such as around access doors, at the interface between the nose cowl and the fan cowl door, etc. Typically, a series of apertures extend through a top portion of the suction chamber below the gap to permit air to pass from the gap to the suction chamber. At least one duct communicates with the chamber and extends to a suction pump. In operation, the pump sucks air through the duct, suction chamber, apertures and gap, to prevent the formation of a transition from low drag laminar flow to high drag turbulent flow at the gap.