Abstract:
A spark ignition system for a gas turbine electronically controls the cycle of charge and discharge of a spark generator of the capacitive type. There is a function generator (5) which derives a reference voltage as a function of the speed of the turbine and possibly of other parameters. A charge control (6) for the capacitive cell (9) and a spark frequency control (7) are controlled by the reference voltage. Reignition in the case of flame extinction is controlled by an opto-electronic arrangement (11, 12, 13) which drives a reignition circuit (14), when flame extinction is detected. The reignition circuit produces a voltage which is superimposed on and over-rides the speed reference voltage to activate the system to produce ignition at a start condition.The system can be used for ignition of a gas turbine, especially a turbo-compressor.
Abstract:
A device is provided for regulating a combustion engine whose operation is governed by a set of parameters P.sub.i (1.ltoreq.i.ltoreq.n), including essentially an assembly of "m" regulation loops for regulating "m" parameters (with m.ltoreq.n), a set of "q" sensors (with q=n-m) for measuring the parameters which are possibly not regulated and a regulator common to the assembly of these "m" loops, for providing, from the different references and the values detected by the different sensors, a signal controlling the different actuators so as to ensure the evolution of each of the regulated parameters, in connection with the evolution of all or part of the other parameters, regulatable or not, regulated or not and for maintaining the engine at all times in a condition of optimum operation.
Abstract:
A full process control for use with a molecular assay and a method of determine the efficacy of the molecular assay. A full process control can include a fixed cell, and specifically can include a fixed vegetative cell. A method of determining the efficacy of a molecular assay can include providing an internal control, mixing the internal control with a sample, lysing the internal control and the sample, and detecting the lysis product. The full process control and/or the internal control can be Bacillus subtilis cells.
Abstract:
The present invention decribes reagents free of detectable contaminating nucleic acids for performing highly sensitive and specific nucleic acids amplification and/or detection. It relates to an improvement in the technology of nucleic acid inactivation prior to nucleic acid testing (NAT) in order to prevent false-positive results. Specifically, this invention describes optimized and standardized reagents and ultra-violet treatment to achieve an effective and highly reproducible nucleic acid inactivation prior to NAT without substantially affecting the performance of the assay. More specifically, this nucleic acid inactivation process resulted in a reduction of up to four logs of the background signal associated with the PCR (polymerase chain reaction) amplification of DNA contaminating PCR reagents. This optimized and standardized method is also adaptable for use with NAT technologies other than PCR.
Abstract:
The present invention relates to probes and primers for the detection of periodontal pathogens such as Bacteroides forsythus, Porphyromonas gingivalis, Prevotella intermedia and Prevotella nigrescens. As well, the invention relates to rapid and sensitive methods for the detection and identification of periodontal pathogens from an oral sample taken from a patient. Diagnostic kits for the detection and identification of periodontal pathogens in an oral sample from a patient, are also disclosed.
Abstract:
A process for automatically controlling a hydraulic servovalve with a hydraulic slide valve displaced by a rotary actuator. The process includes a first loop for automatically controlling the delivery as a function of the measurement of the angular position of the rotary actuator and a second automatic control loop with variable control as a function of the pressure measurement. The first automatic control loop is a proportional action loop whose increase is constant for the absolute values of the pressure deviation which are less than at least a threshold value and then varies in an increasing manner for absolute values of the pressure deviation which are greater than the same threshold.
Abstract:
The adherence of a wheel to a braking track is defined by a point of operation that is variable on an adherence curve as a function of the slip of the wheel. In operation, the braking torque servo control parameter utilized is the sign of the variation of the slope of the adherence curve at the above-mentioned point of operation. The braking torque is servo-controlled in such a way that this point of operation is the same as the point of maximum adherence of the adherence curve.
Abstract:
An electronic control for an internal combustion engine, and for precisely controlling the instant at which the ignition sparks are emitted. It is fitted with an electronic contact breaker and with sensors for measuring physical parameters characteristic of the conditions under which the engine is operating. This control comprises two channels whose operation is mutually exclusive, namely a first channel which operates when the engine is started and is idling, and a second channel which operates when the engine is running at high speed and under load.The control is applicable to electronic ignition systems for internal combustion engines with controlled emission.
Abstract:
This invention describes a rapid (10 to 15 minutes), simple, flexible and efficient method of nucleic acids extraction for nucleic acid testing assays. This method has the following basic steps: i) mechanical cell lysis using solid particles in the presence of a chelating agent, followed by ii) controlling the presence and/or activity of NAT assays inhibitors. This method is applicable to various biological samples and universal for microorganisms, as one can use it to extract nucleic acids from test samples containing target viruses, bacteria, bacterial spores, fungi, parasites or other eukaryotic cells, including animal and human cells.
Abstract:
A device for the control of a hydraulic slide valve. The hydraulic valve being put into motion by a motor and by a draw-back spring, the device including structure for controlling the rotational direction of the motor as a function of its positional error, the control structure being, in turn, controlled by a signal given by a correction circuit, the transfer function (K(s)) of which corrects a jet effect that is exerted on the slide valve. The device has application to hydraulic systems requiring large passbands.