Weight reduction packaging

The comparison of the housing geometry of active and passive sensors clearly shows the reduction of sensor dimension and weight reduction. The applied ASICs enable a large family of application-specific constructions because of their minimal packaging. Fig. 7.9.9 shows examples for further configurations. 

The reduction in the weight of packaging has been made possible by the development of new materials fulfilling traditional requirements using less material. For instance, flexible packaging is now taking over applications that... 

Printed circuit board (PCB) structures and processes continue to be driven by device miniaturization, functional densification, and speed. The choice of components, actives and passives, and connectors are primary determinants of layer count and layer options, such as copper foil weights. Reductions in chip voltages are matched by an increase in current demand this in turn causes increases in the number and thickness of the plane layers. More device leads combined with decreasing pitch increases the number of vias and interconnecting layers, while miniaturization and weight reduction at the product level forces reduction in the physical package for the product. 

For non-transparent or non-translucent specimens, the relative humidity of the interfacial climate on an irradiated surface can be decisive for photo-chemical aging. Tests with PE-HD packaging showed clear influence of relative humidity on molecular weight reduction and carbonyl group formation. Figure 1.32 [87]. 

Size exclusion liquid chromatography M) has been widely used to characterize distributions of molecular weights in polymer specimens. This paper describes a package of computer programs for automatic data collection and data reduction in size exclusion liquid chromatography (2). The programs and the environment in which they operate are carefully tailored to emphasize the interaction between the user and his data rather than the Interaction between the user and the computer. The system we describe differs from that described by Koehler et al. (J) in that all functions are performed by a stand-alone system. 

More impi manl than moisture content, per se. is the objective of creating a preserved food substance lhai is stable and can he eaten directly. An idealized IMF system will have ilia microbial stability at reduced water activity. 17) storage siabiliiy without special conditions. l3i reduction of weight and more compactness of product, and (41 can be consumed from the package without rehvtlrulion Some authorities believe that IMF systems represent excellent potential in the development of the snack market... 

Multichip Packaging. A solution to these problems is to mount a number of ICs closely together on a common substrate within an MCP. The obvious advantages of the MCP are the reduction in the overall size and weight of the package and, thus, the reduction in the size and cost of the system. The reliability of the system is also improved, because the chip-to-chip interconnections can be accomplished within the package, which reduces the number of package-to-board connections. 

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