2155results about How to "Reduce instability" patented technology

The present invention provides an improved method and system for real-time monitoring, validation, optimization and predictive fault analysis in a process control system. The invention monitors process operations by continuously analyzing sensor measurements and providing predictive alarms using models of normal process operation and statistical parameters corresponding to normal process data, and generating secondary residual process models. The invention allows for the creation of a fault analyzer directly from linearly independent models of normal process operation, and provides for automatic generation from such process models of linearly dependent process models. Fuzzy logic is used in various fault situations to compute certainty factors to identify faults and / or validate underlying assumptions. In one aspect, the invention includes a real-time sensor data communications bridge module; a state transition logic module; a sensor validation and predictive fault analysis module; and a statistical process control module; wherein each of the modules operates simultaneously.

The present invention pertains to a method and an apparatus to generate a density image of an object using fan or cone beams of radiation and collimated detectors on one side of the object. The method consists of irradiating an object with a plurality of pairs of non-parallel radiation beams wherein the beams in each pair intersect a same segment along the axis of the detector. Compton-scattering radiation from the beams are then measured, and corrected attenuation coefficients along each beam are obtained. This latter step is effected by taking a first ratio of detector measurements for the beams in each pair; comparing the first ratio with a second ratio of corresponding calculated detector measurements and balancing discrepancies between the first and second ratios in a forward-inverse numerical analysis algorithm. Taking ratios of attenuation coefficients along related incident beams eliminates non-linearity problems whereby the aforesaid algorithm can be solved.

A post-occlusion chamber collapse canceling system for a surgical apparatus that detects the breaking of occlusions by tissue fragments in the distal end of the aspiration path and produces a response comprising a transitory blockage of the distal end the aspiration path to terminate the chamber collapse and a simultaneous transitory venting of the aspiration line to relieve the vacuum, in a way that post-occlusion chamber collapses are cancelled.Disclosed herein, in a preferred embodiment, is a surgical system and related method for preventing collapse of a body chamber being operated upon, due to a vacuum surge following a clearing of an occlusion in an aspiration path of the surgical system, comprising: an occlusion-break sensor for sensing the clearing of the occlusion; a normally-open occlusion valve, temporarily closing in response to the occlusion-break sensor sensing the clearing of the occlusion, thereby occluding fluid flow through the aspiration path and controllably stabilizing the occlusion break, thereby preventing the vacuum surge and consequent body chamber collapse; and a normally-closed venting valve temporarily opening in response to the occlusion-break sensor sensing the clearing of the occlusion, to reduce the vacuum thereby preventing the vacuum surge and consequent body chamber collapse. In an alternative embodiment, the normally-open occlusion valve may be omitted.In yet another alternative embodiment, disclosed is a similar surgical system and related, comprising a normally-closed occlusion valve, temporarily opening for a defined interval before returning to a closed stated, and repeating the temporarily opening and closing at a controlled repetition rate, in response to control by an operator of the system, wherein, by opening the aspiration path in response to the control by the operator, flow through the aspiration path is controlled by the operator thereby preventing the vacuum surge and consequent body chamber collapse.

The presence of radiation shielding material concealing illegitimate content in a container is detected by obtaining each of measured gamma-ray data and measured neutron data from the container, and comparing the measured gamma-ray and neutron data to expected gamma-ray and neutron data. An anomaly between the measured data and the expected data is an indicum of the presence of such material shielding such illegitimate content.

A controller for a switched mode power supply (SMPS) is provided. The SMPS is equipped with a transformer having a primary side winding, a secondary winding, and an auxiliary winding. The controller includes a detection circuit for detecting a transition from a first output load condition to a second output load condition of the SMPS and a control circuit coupled to the detection circuit and being configured to output one or more control signals in response to the detected output load transition. Depending on the embodiment, the one or more control signals include a first control signal for turning on a power switch to cause a current flow in a primary winding of the SMPS and / or one or more second control signals for turning off one or more functional circuit blocks in the controller.

A communications network including first and second stations, the first station comprising a transmitter and the second station comprising a receiver. The network further including a transition control portion which is operable, prior to a change in a transmission rate of a preselected signal from the first station to the second station, to cause transitional signals to be transmitted from the first station to the second station over the course of a transitional period expiring before the change is effected. The power levels of the transitional signals are varied over the course of the period in such a way as to reduce a level of instability in the network. In another embodiment probing signals are transmitted prior to making such a rate change to probe a likely relationship between the transmission rate and transmission power after the change is effected.

A fuel injector for a gas turbine combustor is disclosed which includes a feed arm having a flange for mounting the injector within the combustor and a fuel nozzle depending from the feed arm for injecting fuel into the combustor for combustion. An optical sensor array is operatively associated with the fuel nozzle for observing combustor flame characteristics. The optical sensor array includes a plurality of sapphire rods positioned to be close enough to the combustor flame to oxidize soot deposits thereon.

An apparatus basically uses a simple and compact multi-axis magnetic lens to focus each of a plurality of charged particle beams on sample surface at the same time. In each sub-lens module of the multi-axis magnetic lens, two magnetic rings are respectively inserted into upper and lower holes with non-magnetic radial gap. Each gap size is small enough to keep a sufficient magnetic coupling and large enough to get a sufficient axial symmetry of magnetic scale potential distribution in the space near to its optical axis. This method eliminates the non-axisymmetric transverse field in each sub-lens and the round lens field difference among all sub-lenses at the same time; both exist inherently in a conventional multi-axis magnetic lens. In the apparatus, some additional magnetic shielding measures such as magnetic shielding tubes, plates and house are used to eliminate the non-axisymmetric transverse field on the charged particle path from each charged particle source to the entrance of each sub-lens and from the exit of each sub-lens to the sample surface.

A fuel injector for a gas turbine combustor is disclosed which includes a feed arm having a flange for mounting the injector within the combustor and a fuel nozzle depending from the feed arm for injecting fuel into the combustor for combustion. An optical sensor array is located within the fuel nozzle for observing combustion conditions within the combustor.

A fuel injector for a gas turbine combustor is disclosed which includes a feed arm having a flange for mounting the injector within the combustor and a fuel nozzle depending from the feed arm for injecting fuel into the combustor for combustion. An optical sensor array is located within the fuel nozzle for observing combustion conditions within the combustor.

Systems, methods and apparatus for reducing instabilities in a plasma-based processing system are disclosed. An exemplary method includes applying power to a plasma with a power amplifier; determining whether low frequency instability oscillations are present or high frequency instability oscillations are present in the plasma; and altering, based upon whether high or low frequency instability oscillations are present, an impedance of a load that is experienced by the power amplifier, the load experienced by the power amplifier including at least an impedance of the plasma.

A CPAP apparatus has a variable rise time (iii) from a base level of positive air pressure during expiration (EPAP) to a higher level during inspiration (IPAP). The rise time is adjusted in order to reduce obstruction, resistance or instability in the upper airway.

A keyboard mechanism for a low-travel keyboard and methods of fabrication are described. The low-travel keyboard is suitable for a thin-profile computing device, such as a laptop computer, netbook computer, desktop computer, etc. The keyboard includes a key cap that can be formed of a variety of materials in the form of a flat slab. The key cap is attached to one end of a support lever that supports it from underneath. In one embodiment, the support lever is formed of a rigid material and is pivotally coupled with a substrate on the other end. In another embodiment, the support lever is formed of a flexible material and is fixedly attached to the substrate on the other end. The portion of the support lever that is attached to the key cap is positioned over a metal dome that can be deformed to activate the switch circuitry of the membrane on printed circuit board underneath the dome.