An inactivated influenza virus vaccine is produced by treating the virus before or after inactivation with formalin with a small amount of an organic solvent selected from the group consisting of dilower alkyl ethers and lower alkyl esters of lower fatty acids. The amount was usually less than 2 volumes of the solvent, for a short time, not significantly in excess of 4 hours and preferably from 15 minutes to 2 hours, the shorter times being used when the volume of solvent is in excess of 1. Pref...

A modified type "E" coupler having a knuckle with a horizontal contour extending forwardly and angularly for reducing slack when coupled with either an "E" or "F" coupler, and a vertical contour tapering and curving for allowing vertical angling in area contact condition.

Transmission performance of a multimode waveguide is optimized (i.e., pulse dispersion is minimized) by optimizing the coupling among the different modes. More specifically, in a waveguide supportive of modes having group velocities v.sub.1 and v.sub.2, and wherein the coupling mechanism comprises random discontinuities having an essentially white spectrum, optimum coupling is defined by an optimum coupling length L.sub.opt given by L.sub.opt = k .sup.. f , Where f is the midband signal frequenc...

Read-only memory size reduction based on the implication theory of logical mathematics. A different designation number is generated by the memory in response to the application of an interrogation pulse to each of the word line input terminals. If one of the designation numbers implies another designation number, then the latter may be generated from the former with a cross-point impedance element saving which equals the number of logical bits that are common to both designation numbers.

An amplifying system, particularly for application in which the input and output transducers are closely coupled acoustically, for example, hand-held power megaphones and the like, as a result of which feedback howl may occur, in which an amplifier stage thereof is constructed for class B operation and is provided with a capacitor in the input circuit thereof, arranged to be charged by an input signal and apply a reverse bias to said input circuit operative, in the presence of a sustained feedba...

A process is described for forming highly dense, metal briquettes of reduced size which are suitable for direct melting in an electric induction furnace. A finely divided metal ore concentrate is intermixed with a finely divided carbonaceous reductant thermosetting binder having a low volatile content consisting essentially of 1 to 20% of either coal tar pitch or gilsonite. The intermixture is then compressed to form compressed, compact briquettes ranging in size from two or more inches in diame...

Reduced pyridine compounds, including 1,4-dihydropyridine compounds and 1,2-dihydropyridine compounds, are useful as latent image amplifiers. They can be incorporated in a silver halide emulsion or incorporated in a layer adjacent to a silver halide emulsion layer in a photographic element. The reduced pyridine compound may be used in a silver halide developer solution or in an activator solution for use in a silver halide photographic element containing an incorporated developer. Silver halide ...

Dihydroheterocyclic amines having a N-hydrocarbyl substitution and a 2-(or 4-) (omega-(nuclearly substituted cyclic)) vinylenyl substitution are described. These compounds are oxidized in an acidic environment to produce styryl and cyanine dyes.

A high sensitivity Dynamic Crossed Field Photomultiplier (DCFP) includes a photocathode for emitting electrons in response to a light input, an adjacent dynode for providing electron amplification by multiple secondary electron emissions in response to electrons emitted from the photocathode, a magnetic field for providing a component force to urge emitted electrons to move linearly down said dynode, a fixed-potential accelerating field over the dynode and photocathode for providing a component ...

An external combustion engine wherein air compressed in a plurality of cylinders is delivered to a common combustion chamber is disclosed. The hot exhaust gases exiting the combustion chamber of the present invention are returned directly to the cylinders at a pressure which approximates the compressed air delivery pressure. In a preferred embodiment the combustion chamber is divided into two portions and control over the engine output power is achieved either by varying the time of opening of t...