Plain Materials Should: The choice of plain or figured textiles. There can be no fixed rule as to when figured or plain materials should be used for overdraperies. Patterns unquestionably produce a gay effect; plain materials are more restful. The choice of either is a matter of i ,ste. Visual fatigue and monotony should both be avoided, and perhaps the different rooms in the house should be treated with varying materials in order to introduce the variety that is necessary for good decoration. A rule that is followed by many decorators is to use plain drapery materials in rooms with patterned walls, and vice versa. Draperies should always contrast with the Wall in some manner; if pattern is not used to foil a plain adjoining surface, contrast can be introduced by color, tone, or texture. A certain amount of interest and variety is always obtainable by trimming draperies with color-contrasting fringes, borders, or edgings. Valances and draperies may also be made of different materials.
The choice of plain or figured textiles. There can be no fixed rule as to when figured or plain materials should be used for overdraperies. Patterns unquestionably produce a gay effect; plain materials are more restful. The choice of either is a matter of i ,ste. Visual fatigue and moŽnotony should both be avoided, and perhaps the different rooms in the house should be treated with varying materials in order to introduce the variety that is necessary for good decoration. A rule that is followed by many decorators is to use plain drapery materials in rooms with patterned walls, and vice versa. Draperies should always contrast with the Wall in some manner; if pattern is not used to foil a plain adjoining surface, contrast can be introduced by color, tone, or texture. A certain amount of interest and variety is always obtainable by trimming draperies with color-contrasting fringes, borders, or edgings. Valances and draperies may also be made of different materials.See Also Raw Materials For Growth:Cells require a basic supply of raw materials for growth; when any of them is used up, growth stops, regardless of how much of the other nutrients remain. Second, the environŽment becomes too toxic to permit further growth. Cells pour out waste materials as they respire and synthesize needed components. At low population densities the level of these materials remains inŽsignificant, but as the density increases, the enŽvironment becomes so toxic that further growth is impossible, regardless of the food supply.
Two significant advances in materials during the past year have been (1) the growth of much better gallium arsenide and gallium phosphide single crystals through the use of liquid epitaxy techniques, and (2) the synthesis of new single-crystalline materials such as lithium tantalate and barium sodium niobate. The gallium arsenŽide and gallium phosphide crystals have been used in constructing improved solid-state lasers, electroluminescent lamps, and Gunn oscillators, while the latter materials have been used in nonlinear optical systems.
On The Other Hand See Solid Materials:The ability to create new and better devices rests primarily on the development of new maŽterials or improved characteristics in older ones. This is especially true in the area of solid-state electronics (that branch of electronics dealing with conductivity in solid materials). There, each significant advance in materials research has led to applications that were previously imposŽsible. It is also true that studies aimed at testing the feasibility of new devices often encourage the development of better materials.
Progress in electronics during the past months consisted of several outstanding imŽprovements in previously discovered solid-state devices. These included: (1) development of techniques for producing new materials or preŽviously known materials with superior characŽteristics, (2) design and manufacture of large-scale integrated circuits that perform extremely complex operations with improved reliability, (3) development of commercial solid-state microwave oscillators that can operate in a variety of modes at high power levels, (4) reŽsearch leading to a better understanding of electroluminescence and development of highly efficient red and green light sources, and (5) significant new applications of lasers in the areas of picosecond pulse, and in nonlinear.
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