Showing papers on "Decoupling (electronics) published in 1974"

Circuit for supplying a dc load from an ac source through a rectifier

Abstract: An improvement A.C. a circuit for supplying a D.C. load from an A.C. source through an uncontrolled rectifier with a control element arranged between the output of the rectifier and D.C. load using a control unit synchronized with the A.D. source to keep the power factor at a predetermined value and the circuit including a capacitor associated with the DC control element and a by-pass diode bridged across the DC load in which, in order to suppress harmonics to the greatest degree possible, the DC load is bridged by two by-pass diodes connected in series in the same direction and the capacitor associated with the DC control element is connected between one input terminal and the center connection point of the two by-pass diodes. In a second variation, the same result is achieved with the capacitor and a first decoupling diode connected in series between the input terminals of the DC control element with one electrode of the capacitor connected with one input terminal of the DC control element and the other electrode of the capacitor through a second decoupling diode to an output terminal of the DC control element.

Device for the electrical protection of a coaxial cable by two connected circuits

Abstract: A device is provided for the protection of a coaxial cable. In parallel to the coaxial cable is an equipotentiality circuit. Connected in series to the latter is a decoupling circuit. The decoupling circuit comprises a quarterwave line at each cut of the coaxial cable, the external line being open, whereas the decoupling circuit is incorporated in one of the branches of the T connection forming the equipotentiality circuit. The composite branch of the T connection is formed by means of a triple coaxial cable.

Distribution networks and electrically controllable couplers for integrated optics.

Abstract: The power distribution as a function of propagation distance in a network of coupled optical waveguides is determined for several interesting cases. An electrically controllable coupler is proposed and analyzed in detail. High efficiency coupling and decoupling between two optical guides can be accomplished with the use of an electrooptically generated dynamic channel, of finite length, located in between the two guides.

Quantitative 13C NMR analysis of mixtures of 2,4-di-isocyanatotoluene and 2,6-di-isocyanatotoluene

Abstract: Some isomeric mixtures, such as the toluene di-iso-cyanates, may be quantitatively analysed by measurement of peak heights of a 13C FT-NMR spectrum without the use of gated decoupling or the addition of paramagnetics.

Programmable ECL threshold logic gate

Abstract: A decoupling technique useful in the mechanization of some logic family devices is disclosed. The procedure involves the insertion of a common base transistor between a collector node at which several collectors may be connected and the load resistor for the output device. In general the emitter of the common base decoupling transistor is connected into the collector node and the collector of the common base decoupling transistor is connected to the output load resistor. The impedance thus presented at the collector node by the common base emitter is very much smaller than the load resistance and as a result, the collector time constant becomes relatively insignificant compared with other time constants in the circuit. Practical realization of differential current threshold programming is thus made possible through the implementation of the decoupling techniques of the invention.

Generalization of decoupling control

Abstract: This correspondence develops sufficient conditions for decoupling of an r -input m -output multivariable control system via control law with a rectangular feedforward matrix. A synthesis example of the decoupling control system is given and studied.

Temperature compensated emitter coupled logic circuit

Abstract: A temperature compensated emitter coupled logic circuit includes a differential amplifier formed of a pair of emitter coupled transistors each having emitter follower stages connected to the respective outputs thereof. A compensation network is connected with the collectors of the transistors of the differential amplifier by way of separate decoupling resistors supplying or receiving, respectively, a current which is independent of the switching state of the differential amplifier and whose magnitude increases with increasing temperature.

13C nuclear magnetic resonance spectra of arylthallium(III) bis(trifluoroacetates)

Abstract: 13C chemical shifts and 13C205Tl spin–spin coupling constants are reported for phenylthallium(III) bis(trifluoroacetate) and some of its mono- and dimethyl derivatives. The signs of nJ(13C, 205Tl) relative to n+1J(1H, 205Tl) are determined by offresonance decoupling of protons.

Three-stage near-optimum design of nonlinear-control processes

Abstract: A systematic near-optimum design technique for the control of nonlinear-control processes is presented. The method consists of three stages. In the first stage, called ‘subprocess decoupling’, coupling is neglected between two or more subsystems, thus reducing the process to a set of weakly coupled subprocesses. The second stage is to represent each subprocess by ‘slow’, ‘basic’ and ‘fast’ models, and is called ‘time-scale decoupling’. The third stage eliminates slow and fast variables, and obtains a near-optimum control for the basic subsystem. The method is applied to a coiler process common in continuous rolling mills.

Magnetism of the Nearly One-Dimensional Helical Spin System

Abstract: Magnetic properties of the nearly one-dimensional helical magnet VF 2 are studied by the two-time Green function method. The Neel temperature, T N , sublattice magnetization, and susceptibility along the c axis, χ c , below T N are calculated by using the Tyablikov, Callen, and modified Callen decouplings. The results for T N are much lower than the molecular-field estimate and found to be fairly close to that observed. The measured temperature dependence of χ c is qualitatively consistent only with the Callen decoupling prediction. Then, by using this decoupling, various spin-correlation functions, magnon energies renormalized by a k -dependent factor, and χ c above T N are calculated. The temperature dependence of the turn angle is also studied, and the ratio of the exchange constants between and within linear chains is found to be about 0.156. For comparison a similar but three-dimensional magnet MnO 2 is treated.

Optimization of turbo-alternator dynamic response using state feedback decoupling

Abstract: The application of state feedback decoupling is proposed for the minimization of transients following small changes in real and reactive power levels in a turbo-alternator connected to an infinite bus through u transmission line. For an example. a ninth-order linearized system model is decoupled into two third-order single-input-single-output systems. The poles of these systems are optimally placed to satisfy n variety of design specifications. From the computational point of view, t his approach is far more attractive than that using state-variable or output feedback without decoupling. It also provides better insight into the problem.

Decoupling of Scan Period and Control Period for Sheet Process Control Systems Employing a Scanning Gauge

Abstract: This paper is concerned with the development of a simple technique for decoupling the measurements of machine direction (MD) and cross machine direction (CD) variations in sheet process production systems employing a single scanning gauge. An important consequence of the method is that machine direction control can be exercised at a much higher rate than is possible with current methods of separating MD from CD. This, in turn, can mean a significant improvement in MD control performance since the range of MD disturbances a given control system is capable of suppressing is increased.

Decoupling apparatus for a common-antenna receive-transmit system

Abstract: In communications systems, decoupling apparatus for enabling the use of a common antenna to simultaneously perform transmit and receive functions Inductive and capacitive decoupling circuits in the apparatus provide decoupling from a common transmitting antenna in a manner substantially independent of transmittermulticoupler off-resonance impedance and further provide decoupling as a function of frequency whereby the communications system is atmospheric-noise limited over the frequency band of interest

Decoupling of non-linear time-delay systems

Abstract: Tho input-output decoupling problem of non-linear multivariablo systems with multiple delays in the state andsor the control vector is treated. Two examples are worked out to illustrate tho theory.

Steady state decoupling and design of linear multivariable systems

Abstract: A constructive criterion for decoupling the steady states of a linear time-invariant multivariable system is presented. This criterion consists of a set of inequalities which, when satisfied, will cause the steady states of a system to be decoupled. Stability analysis and a new design technique for such systems are given. A new and simple connection between single-loop and multivariable cases is found. These results are then applied to the compensation design for NASA STOL C-8A aircraft. Both steady-state decoupling and stability are justified through computer simulations.