Abstract: An improved matrix address system is disclosed wherein zero cross-talk and maximum contrast are obtained by utilizing a constant absolute magnitude data signal, and address and data signals in a voltage ratio equal to the square root of n, where n is the number of addressable columns and therefore the number of devices in a given row, so as to yield the maximum ratio, R, of the r.m.s. values of the "on" voltage and the "off" voltage applied to any given device, namely, R = 1 + 1/.sqroot.n.

Abstract: Nematic liquid crystal mixtures characterized by a homogeneous boundary condition are prepared by the addition of soluble compounds having at least two polar groups to nematic liquid crystals of either positive or negative dielectric anisotropy. Between approximately 0.5 and 5 percent by weight of compounds such as dicarboxylic acids, aliphatic diamines, aliphatic dinitriles, diols, polyalkylene glycol, alkanol amines, e.g., ethanolamine, diethanolamine, triethanolamine and diethylene triamine, for example, when dissolved in a nematic material produce spontaneous homogeneous boundary conditions therein.

Abstract: A resistive gate field effect transistor (FET) is disclosed in which the gate comprises a resistive film overlying an insulating layer and in contact with both the source and drain electrodes. This provides an integrated circuit, bidirectional voltage limiter in which the limiting voltage can be tailored to almost any value likely to be found on an integrated circuit. In another form of the present invention, a conductive gate is added between the resistive gate and the substrate.

Abstract: A central station is described which acts as an interface between a two-way communication system superimposed on a power distribution network and a data processing computer. Information from the computer is converted into control signals for activating various sequences of sub-tasks by the communication system. Information from communication system is temporarily stored, converted into a suitable code, and transferred to the data processing computer by way of a teletypewriter terminal. Provision is also made for receiving and responding to priority signals from the system.

Abstract: A continuous wave (c.w.) receiver is described comprising an amplitude limiting section, a commutating filter section, peak detecting means, and a threshold device. The receiver detects the presence or absence of an incoming signal over a very narrow, adjustable bandwidth. The limiting section clips the signal and noise at a predetermined amplitude and, in combination with the commutating filter, reduces the effect of noise, particularly impulse noise. The peak detector selects the highest output from the commutating filter and, in combination with the commutating filter, performs a pseudo-synchronization function when the received signal and an internal signal are not synchronized exactly.

Abstract: A two-aperture immersion lens comprising two substantially parallel plates having a plurality of optically aligned apertures therein is disclosed for an electron optical system. The spacing between the plates and the dimensions of the apertures are selected to provide spherical aberration characteristics which are substantially lower than those for the three-aperture Einzel lens. Also, higher beam current densities and longer cathode lifetimes are provided for electron beam systems by employing two-aperture immersion lenses.