Abstract: A device for use with coaxial cable to attenuate sheath currents associated therewith. The device is adapted to be coupled to incoming and outgoing coaxial cables and includes a ferrite core configured as a first hollow cylinder mounted coaxially within a housing configured as a second hollow cylinder. A conductor within the housing has opposite ends positioned for electrical contact with the incoming and outgoing coaxial cables and an intermediate portion passing through the ferrite core longitudinally at least twice, being passed back over the outside surface of the core between passes therethrough. The elements are so dimensioned that the outside diameter of the housing is less than one inch, thereby allowing side-by-side mounting of a plurality of the devices on industry-standard, multi-port taps which have center-to-center spacings of one inch.

Abstract: A device providing an enclosure for electronic components of an RF filter, trap, or the like for use in a CATV system. The device includes a hollow, cylindrical body portion with male and female headers at opposite ends with mutually engaged portions of the body and headers serving to rotationally lock the body and headers to one another. The mutually engaged portions comprise a pair of notches in each end of the body member and a pair of tabs on each of the headers which extend into the corresponding notches, the tabs and notches having substantially equal widths to prevent rotation of the headers relative to the body upon application of a torque, such as occurs when the devices are installed and threaded to an adjoining connector. In addition to the single body version, the invention is disclosed in a six-pole version having three body members arranged in successive, coaxial relation and rotationally locked to the headers at each end and to adjoining body members.

Abstract: A method and system are presented for monitoring the performance of a clinical trial, and the adherence of trial participants to a protocol for the clinical trial. A plurality of templates are provided, which can be populated with protocol data can be entered that relate to behavioral elements of the protocol. The populated templates are downloaded to a plurality of remote devices. The remote devices generate, upon receipt of the templates populated with protocol data, prompting messages that prompt participants whether protocol elements have been performed, and that request performance data relating to any actual performance of the protocol elements. Based on the performance data, reports are periodically generated that compare actual performance of the protocol elements with expected or desired performance of the protocol elements.

Abstract: A supercharger system for an internal combustion model engine is driven by the associated engine and includes a drive belt, a belt driven pulley and a mounting bracket. The pulley drives a shaft, which is connected to the turbo impeller. The impeller is driven at multiple speeds within a volute. The turbo impeller is recessed into an internal housing to provide smooth air flow from the impeller into the volute. The mounting bracket provides flexibility in mounting to various internal combustion model engines. A portion of the supercharger output pressure can be diverted through a hose containing a check valve and used to create positive pressure in a pressurized fuel cell, resulting in consistent and even flow of fuel into the engine's combustion chamber.

Abstract: A universal joint assembly has a housing and a universal joint in a chamber within the housing. A diaphragm seal in the housing forms a wall of the chamber. The chamber is substantially sealed to exclude entry of foreign elements. The diaphragm seal is flexible to allow for expansion and contraction of the chamber due to changes in temperature to prevent any substantial increase or decrease in the pressure within the chamber.

Abstract: A method to improve communication system performance using an adaptive modem that estimates the communication channel scattering function to select one of several modulation schemes. The scattering function is estimated from the channel's frequency (doppler) and time (multipath) spreading effects on a probe signal. The probe signal is transmitted from a first modem to a second modem. The second modem processes the channel measurements and transmits the channel spreading factors to the first modem. Based upon the channel scattering function estimate, channel characteristic data, propagation models, strategic information, and modem position estimates, the first modem selects one of several modulation schemes. Subsequent data transmissions from the first modem to the second modem contain a modulation mode identifier. The second modem uses the modulation mode identifier to select the correct demodulation scheme.

Abstract: A modem to improve communication system performance that uses multiple modulation schemes comprising modulation technique and encoder combinations. As communication system performance and objectives change, different modulation schemes may be selected. Modulation schemes may also be selected upon the communication channel scattering function estimate, and the modem estimates the channel scattering function from measurements of the channel's frequency (doppler) and time (multipath) spreading characteristics.

Abstract: A shuttle exchanger 22 exchanges a shuttle 19 circulating in a reentrant lumen 13 by actuating a channel selector 27 to alter the path of the shuttle to be exchanged. Following the altered path the to-be-exchanged shuttle impinges on a shuttle 42 stored in a storage channel 25 and drives it into the reentrant loop while the to-be-exchanged shuttle is retained in the storage channel. The enclosing wall 23 of the shuttle exchanger defines part of the reentrant lumen and includes therein the channel selector 27, the shuttle storage channel 25, a bypass channel 26, and a collector section 29.

Abstract: A source fluid from which solid material forms when it is cooled is passed through apparatus which defines a continuous reentrant lumen. The lumen has a thermally conductive processing wall from which heat is extracted from the outside as the source fluid flows through the lumen, resulting in formation of solid material on the inner surface of the lumen wall. A runner circulates around the lumen and dislodges material deposited on the inner surface of the lumen wall. This material is then carried as solids of a slurry out of the apparatus with the fluid stream.

Abstract: A new system and method for outswapping a process is disclosed. The new system forms one or more working set list chains (also referred to as "page table chains") during the outswap process. The new system then conveniently locates and outswaps a number of page table pages of the process to be outswapped by traversing the working set list chains. In a preferred embodiment, the forming of each working set list chain is performed while traversing a working set list during outswapping of a number of body pages of a process. Each working set list entry potentially describes a page of virtual memory in use by the process to be outswapped. In a further aspect of the disclosed system, traversing the working set list of the process to be outswapped includes determining whether each one of the working set list entries indicates a private page table page. If an entry in the working set list indicates a private page table page, the present system adds a link to a working set list chain.

Abstract: A process for the continuous production of 1,1,1,3,3,3-hexafluoropropane (HFC-236fa) and/or 1-chloro-1,1,3,3,3-pentafluoropropane (HCFC-235fa) in the liquid phase wherein the HFC-235fa and/or HFC-236fa serve as solvents for the reaction. When the reaction is conducted in the presence of a catalyst of SbF.sub.3, SbF.sub.5 or a mixture of SbF.sub.5 and HSO.sub.3 F, the reaction mass is unexpectedly less corrosive to the reaction vessel used.

Abstract: An undersea vehicle propulsion and attitude control system is used to conl the forward/reverse movement, vertical up/down movement, lateral movement, pitch, roll and yaw of an undersea vehicle. The propulsion and attitude control system includes a forward port at a forward end of the undersea vehicle, an aft port at an aft end of the vehicle, and radial ports extending radially along the undersea vehicle. The propulsion and attitude control system further includes a single pump, either reversible or unidirectional, and a plurality of valves that, through a controller, selectively control fluid flow between the pump and the forward port, aft port, and radial outlet ports in the undersea vehicle, to provide accurate vehicle propulsion and attitude control.

Abstract: Materials including suspended particles are brought together and then separated into two streams one of which only contains the particles, the output streams having different composition from inlet streams. Separation is effected in filtration modules which include a moving runner with wall conditioning elements which dislodge accumulated particles from porous walls of filters.

Abstract: The invention relates to an engine for an aircraft. The engine includes an engine housing having a drive shaft and a power output shaft. The power output shaft and the drive shaft are separately journalled within the engine housing. The power output shaft includes a propeller at a front end for providing propulsive thrust for the aircraft. The aft end of the power output shaft extends aft of the engine housing. The drive shaft is rotatably coupled to the aft end of the power output shaft by a gear train located outside and aft of the engine housing. The engine provides bearings which solidly support the power output shaft over a substantial portion of its length. This arrangement significantly reduces the loads which would be applied to the drive shaft and other engine components, and therefore, increases the service life of these components.

Abstract: A processing wall is made part of a boundary of a continuous re-entrant lumen, another part of which is a return section. A free, wall conditioning shuttle circulates around this lumen, clearing accumulated material from the processing wall and returning through the return section to circulate again. While the shuttle is in the return section it blocks flow through the return section and while the shuttle is circulating through the processing wall a blocking structure blocks flow through the return section.

Abstract: A pitch changing apparatus, providing bi-stable operation within a tremolo system which produces two distinct pitches for selected strings. The apparatus includes a shifting element 56, which is engagable to introduce or remove a pre-determined thickness within a tremolo system, creating string tensions relative to chosen, distinct pitches. An established ratio of total string tension and opposing spring counter-tension acting upon a tremolo is maintained by a tension correcting mechanism 73. The tension correcting mechanism is manually rotated to adjustable stop positions of required spring counter-tension, thereby keeping all strings in tune under conditions of changed total string tension.

Abstract: A filter medium is provide in a tubular structure configured in the form of a closed loop. Filter maintenance structures mounted on a continuous string lying within the lumen of the tubular structure are continually driven over the surface of a filter medium to maintain an optimum condition of the filter surface. This string with attached filter maintenance structures is driven around the loop of the tubular structure by hydraulic forces generated by the fluid introduced into the apparatus for filtering.

Abstract: A processing wall is made part of a boundary of a continuous reentrant lumen, and wall conditioning runners circulate around this lumen to dislodge accumulated material from the processing wall and thereby continually restore the wall to the condition required for efficient operation.

Abstract: Energy sensing and monitoring apparatus is disclosed which can sense a plurality of energy levels in a conductor, and provide an indication when any of such energy levels is improper. The energy sensing apparatus includes an inductive device for sensing an energy level in a conductor and for providing an input signal indicative of the energy level; a comparator for receiving the input signal, comparing the input signal to a plurality of predetermined level ranges, and providing an output signal when the input signal does not fall within at least one of the predetermined level ranges; and a power source for supplying power to the comparator.

Abstract: A flexible rod-and sleeve assembly with rod and surrounding sleeve affixed to each other at their bottom ends is maintained by a spring to put the sleeve in tension. The assembly is inserted into a cavity such as a monitoring well so as to extend below the lowest level which the water table may assume. The sleeve is made of a material which is attacked by petroleum products but not by water, and when a layer of petroleum liquid such as gasoline collects on the surface of the water in contact with some region of the sleeve, the sleeve material loses its strength and ruptures. This results in an upward movement of the sleeve, which is used to actuate alarm and signaling mechanisms.