Abstract: Solar radiation absorber having absorbing means within a gas filled housing and an overlying radiation transparent plate spaced therefrom. Ribbons of thin material are disposed between the absorbing means and the plate to restrict convective heat losses.

Abstract: Solar radiation absorber having absorbing means within a gas filled housing and an overlying radiation transparent plate spaced therefrom. Ribbons of thin material are disposed between the absorbing means and the plate to restrict convective heat losses.

Abstract: In a method and apparatus for two-dimensional parallel data processing, a pattern of information to be analyzed is reproduced in a field of bi-stable information bearing elements. The pattern is processed by comparing the states of the six nearest neighbor elements around each element with at least one of the possible patterns of states of said six neighbor elements, without regard to correspondence of rotational orientation of the actual pattern with the possible patterns, and fixing each element in a predetermined state when the actual pattern of states of its six neighbors matches a selected one or more of the possible patterns. The predetermined state in which each element is placed may be a function of the states of its six neighbors, a function of its own original state and the states of its six neighbors, or its own original state.

Abstract: The invention is directed to method and apparatus for introducing liquid samples into a gas chromatographic column by supplying a liquid sample to a heated injector in a continuous, uniform and relatively slow-moving flow; vaporizing the sample in the heated injector; passing the vapor through a supply line in the injector to a restrictor, vented to the atmosphere, until stationary conditions have been established; and then passing the vapor to the gas chromatographic column for sampling by reversing the flow in the supply line for a relatively short time.