An active filter includes a first active stage including an operational amplifier and feedback means wherein the non-inverting input terminal of the operational amplifier is at a ground potential; a second active stage configured in the form of Miller integrator using an operational amplifier and connected in series with the first active stage; and means connecting the non-inverting terminal of the operational amplifier of the second active stage to the inverting terminal of the operational ampl...

Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein: X, Y and R.sub.1 -R.sub.6 are as defined have blood pressure lowering activity and K+ channel activator activity and are useful in the treatment of hypertension.

This invention relates to an improved low-pass, active, elliptic-function filter. One state of the filter includes a twin-T, RC network having an input terminal, an output terminal and a feedback terminal. The output terminal is connected to ground through a capacitor; the input terminal is connected to ground through a capacitor; and the feedback terminal is connected to the output terminal of a noninverting amplifier having a gain greater than or equal to unity. The input terminal of the ampli...

A double balun circuit is provided by connecting two pairs of circut types. The first circuit, a distributed divider circuit, includes first and second pluralities of field effect transistors, a common input transmission line, and a first and second output transmission lines. The common input transmission line is disposed to successively couple the input electrodes of each transistor of both the first and second pluralities of transistors. The output lines are disposed to successively couple the...

Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein: either one of R.sub.1 and R.sub.2 is hydrogen and the other is selected from the class of C.sub.1-6 alkylcarbonyl, C.sub.1-6 alkoxycarbonyl, C.sub.1-6 alkylcarbonyloxy, C.sub.1-6 alkylhydroxymethyl, nitro, cyano, chloro, trifluoromethyl, C.sub.1-6 alkylsulphinyl, C.sub.1-6 alkylsulphonyl, C.sub.1-6 alkoxysulphinyl, C.sub.1-6 alkoxysulphonyl, C.sub.1-6 alkylcarbonylamino, C.sub.1-6 alkoxycarbonylamino, C.sub...

The Probe I is a diagnostic tool for use by electricians, technicians, as well as people with only elementary knowledge of electricity. Its value lies in its ability to screen test many simple as well as complicated components, by using visual as well as audio signlas, to compare the sound of a known good component to the one being tested. Many circuits can be repaired without any idea of what the circuits actually do, and many times without prints for the circuit.

This disclosure depicts a novel apparatus for providing protection to armored personnel carriers such as tanks, or other military vehicles. The invention comprises a series of rectangular armor plates mounted to the surface area of the vehicle. The armor plates adjacent one another and each plate is secured to the tank surface by a threaded fastener. The threaded fasteners maintain the plates a predetermined distance from the tank surface and maintains the plates in a substantially parallel rela...

In a multi-processor system, a program for reducing processor overhead in the dispatch of available work by shifting the burden of responsibility for checking other processors for readiness to accept the work from the Active processor to the otherwise Idle processor. When a processor runs out of work, instead of loading a Wait State PSW it scans queues of available work. During this scan, the scanning processor runs enabled for interrupt so that it can be responsive to I/O and External Interrupt...

An active switch for the intersection region of tracks for mechanically transversely or laterally guided vehicles having support wheels without flanges; the switch which is adapted to be forced open by the vehicle and includes only a single adjustable switch member in the form of a switch tongue pivotal about a fixed bearing in the switch frog, is bent into its end position by the vehicle itself by being pressed against abutments; the cross section of the switch tongue has an approximately const...

An active silencer provided in a pipe which has one end reaching the noise source and the other end open, the active silencer being provided with a sound generating means which is provided at the sidewall of the pipe facing inside the pipe, a sound collecting means which is provided outside the pipe close to the other end and which detects noise dissipated from the pipe opening, a phase leading means which outputs a lead phase output signal which is advanced from the phase of an output signal of...