Weight-sensitive applications

Composite materials are ideal for structural applications where high strength-to-weight and stiffness-to-weight ratios are required. Aircraft and spacecraft are typical weight-sensitive structures in which composite materials are cost-effective. When the full advantages of composite materials are utilized, both aircraft and spacecraft will be designed in a manner much different from the present. 

The low density of SPHs and SPH composites allows applications as a high-strength, light-weight stractural material as well as a packaging material. They will be also good as insulators and fillers in structures with energy-sensitive applications. 

Various immunogenic substances requiring association with carriers are listed in Table 2. Picric acid, discussed as an exceptional low molecular weight sensitizer in Sect. C.II.l, may be cited with some confidence as a compound which associates with autologous carriers, giving rise to an immunogenic complex. This may be inferred from the cross-reactivity data already mentioned, namely that reactions in contact-sensitized animals may only be evoked by contact application of picryl chloride, not by intradermal application or by means of picrylated protein. 

One of the most important applications of molecular weight-sensitive detectors is in the characterization of branched polymers. A branched molecule in solution has a smaller size than a linear molecule of the same molecular weight. This smaller size also means a correspondingly smaller intrinsic viscosity. By comparing the measured intrinsic viscosity of the branched molecule at each elution volume increment to the intrinsic viscosity of the linear molecule with the same molecular weight, a branching factory defined as... 

One limitation of this method that should immediately come to mind is the restriction to relatively low molecular weight polymers. This is a corollary of the fact that chain ends are inconsequential for very long chains. Hence, the sensitivity of the method decreases as the molecular weight of the polymer increases. As a general rule, molecular weights in the neighborhood of 25,000 represent the upper limit for applicability of this method. 

Weight Sensing These devices have been the subject of intensive research, development, and applications. Increased sensitivity and rehability have been the result of this effort, which has been... 

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