An active element sharp cut-off bandpass filter circuit having independently tunable center frequency and Q characteristics. The filter circuit incorporates a high performance operational amplifier having one input connected to ground and a pair of feedback paths interconnecting the amplifier output and the other input. One feedback path includes two capacitors connected in series and the other path includes two resistors connected in series. The input to the filter circuit is connected, via an ...

An active optical fuze is provided for detecting the transit of a target ough a given focal plane and energizing a firing circuit in response to such event. A pair of optical transmitters are alternately pulsed at a known pulse frequency to illuminate two related foci on an approaching target. When the target is not at the focal plane a pair of optical receivers receive light reflected from both foci in-phase. When, however, the target is at the focal plane, the two receivers are illuminated out...

Long-active gonadotropins such as human menopausal gonadotropin, human chorionic gonadotropin, human pituitary gonadotropin, pregnant mare serum, and mixtures thereof are obtained from solutions in the form of a precipitation product with zinc hydroxide or aluminum hydroxide. Injectable preparations containing such long-active gonadotropins are also provided, which are useful for treating disorders of the functions of the genitals.

In a radio active tool holder which includes a power rotated and longitudinally fed shank normally projected into a cylindrical body adapted to mount a tool holder and wherein a series of radial slots are provided in said shank adapted to receive drive balls carried by said body and wherein the radio active ring is mounted upon said body and normally exposed with respect to a longitudinally movable shield on said body and wherein a series of pin and guide slot means are provided between the shie...

The invention comprises an RC active filter circuit, which includes an operational amplifier, and which depending on the circuit topography may function as either a band-pass, or low-pass filter. The circuit has a capacitive network connected between the inverting input of the operational amplifier and earth. This network in conjunction with the feedback network operates to make the feedback, frequency dependent. The frequency dependence of the feedback is adjusted to compensate for variations i...

Compositions that are fungicidally active are described herein along with the method of utility. The compositions contain a compound corresponding to the formula ##SPC1## Wherein R is selected from alkyl, alkenyl, alkynyl and thiochloroalkyl, and R.sub.1 is selected from alkyl, thioalkyl, cycloalkyl, alkenyl and aminoalkyl.

Techniques for operating a network by using a first database with topological information of linked devices and a second database with topological information, software resources, and available hardware resources of certain programmable devices to adapt to changes of the network.

A logic gate including a transistor amplifier with back-to-back Schottky negative feedback diodes causes the input of the amplifier to form a current input summing junction. The Schottky diodes maintain the amplifier always in operating region with the output voltage swing limited by the diodes in each direction. The summing input junction provides weighted voting by use of input control signals of opposite polarity and of different weights.

An active delay-equalizer network which utilizes only two operational amplifiers and a number of resistive or capacitive components to provide a second-order network. The circuit has a low impedance output and hence is readily connected in tandem.

Amidine compounds of the formula ##SPC1## In which one of Z.sup.3 and Z.sup.4 is halogen, hydrogen, trifluoromethyl or lower alkoxy when the other is hydrogen; salts of these compounds; their synthesis; and pharmaceutical preparations thereof. Said compounds are useful in the treatment of cardiac arrhythmias.