Syntactic component

Fig. 7. Phase diagram of three-component syntactic foam 86)...

To avoid crushing, fasteners are supported within these structures by the use of a single-component syntactic paste adhesive Scotch-Weld Void-Filling Compound 3439. 

Finally, reductionism is closely tied to the so-called syntactic approach to theories, an approach which treats theories as axiomatic systems expressed in natural or artificial languages. Indeed, closely tied may be an understatement, since deduction is a syntactic affair, and is a necessary component of reduction. Once philosophers of science began to take the semantic approach to theories seriously, the very possibility of reduction became moot. For the semantic approach treats theories as families of models, and models as implicit definitions, about which the only empirical question is whether they are applicable to phenomena. For reduction to be obtained among models semantically characterized requires an entirely different conception of reduction, and whether such a conception would capture anything of interest about inter-theoretical relations is questionable. 

The keyword label of a standard Pople-style split-valence basis specifies the sp sets (groups of CGTOs of s and p symmetry) with distinct zeta values for each atomic shell, as well as the contraction length of each CGTO. The keyword contains the following syntactical components ... 

For an eventual structural and functional grammar of behavior many types of hidden patterns must be considered. Human behavior is here viewed as the performance of members of the proposed T-pattern family. These are particular types of repeated hierar-chical/syntactic intra- and interindividual real-time patterns describing related aspects of the temporal organization of verbal and/or nonverbal behavior. Related terms are a) markers T-pattem components with particular pre-, post-, and/or bi -dictive powers b)... 

On the other hand, syntactic materials may also be thought of as reinforced or filled plastics, with the gas-containing particles being the reinforcing component. This classification is also justifiable in view of the manufacturing technology. The matrix is not foamed chemically, but is filled mechanically with the hollow spheres. Syntactic foamed plastics are thus called physical foams 6,7). 

The main difficulty in manufacturing a syntactic foam lies in the choice of the process parameters for mixing the components (temperature, duration, and addition sequence). When the mixture leaves the mixer, its viscosity must be low enough for the mold to be filled rapidly, although once there, the viscosity should rise rapidly to prevent the mixture from becoming laminated. If possible, it is best to mix and pour the materials under vacuum so as to prevent the formation of pores and cavities in the finished material. 

Syntactic foams have been made from organosilicone polymers and glass, ceramic, or polymer microspheres 23,100). They are used mainly for heat insulation and ablation coating101). For the latter, the two components are sprayed together onto the exterior of rockets, and cold setting silicone glues are used to improve ablation102). Syntactic materials with carbon microspheres and silicones have also been proposed 39>. 

A family of elastomeric foams has been developed by Rand 129) for use as stress relief coatings on electronic components in encapsulated electronic assemblies. Polysulfide, silicone and polyurethane elastomers blended with glass and phenolic microspheres have been used to formulate syntactic foams (Fig. 10) These foams are used to minimize the stress caused by differential thermal expansion between the component and the encapsulant. 

Syntactic foamed plastics are generally three component systems. For example, a syntactic system with 60% glass microspheres (bulk density of 300 kg/m3) consists... 

The following expression was suggested by Lavrenyuk 75) for the strength of a syntactic foam in axial compression. It assumes that the stresses are distributed within the foam in proportion to the volumetric concentration of its components ... 

Another new, or at least exacerbated, class of faults is that of mismatches at the interfaces between component systems. These are typically semantic (e.g., confusion between Fahrenheit and Celsius) not just syntactic, or due to fundamental policy incompatibilities. (There is in many quarters a present assumption that a middleware infrastructure facilitating the use of Web Services, XML, etc., will largely solve the problems of creating systems-of-systems, but such facilities mainly help deal with syntax issues.)... 

These thermosetting resins are composed of two-component liquid systems. By mixing the liquid systems, the thermosetting resins fUl the voids in the microspheres to form syntactic foams. 

Thermosetting-matrix resins consist of two-component liquid systems which can be easily blended with hollow microspheres at room temperature. In contrast, thermoplastic-matrix resins must be melted for blending with thermosetting hollow microspheres. The following are examples of syntactic foams. 

Until now, our approach to model-driven wrapper development deals with tools and applications offering COM interfaces. Conceptually, COM is a component technology following the object-oriented paradigm. COM components represent subsystems, i.e. a set of classes including attribute and method definitions, relationships between classes, and a set of interfaces to access the subsystem. COM offers an external description of application interfaces by means of a type library. Such interface descriptions of components included in a type library serve as input for the analyzer to comprehend a component and its various parts syntactically. 

FIGURE 2.58 Schematic representations of section through different types of cellular polymer, (a) Low-density open-cell foam, (b) High-density closed-cell foam, (c) Single-component structural foam with cellular core and integral solid skin, (d) Multicomponent structural foam, (e) Fiber-reinforced closed-cell foam, (f) Syntactic foam. 

Figure 2.70a and b are graphical presentations of syntactic foam structure in which the two components, microspheres and resin fill completely the whole volume (no dispersed voids) and the density of the product is thus calculated from the relative proportion of the two. Measured density values often differ from the calculated ones due to the existence of some isolated or interconnected irregularly shaped voids, as shown in Figure 2.70c. The voids are usually an incidental part of the composite, as it is not easy to avoid their formation. Nevertheless, voids are often introduced intentionally to reduce the density below the minimum possible in a close-packed two-phase structure (Figure 2.70a).

Several of the recommendations under consideration hy the ESTG to help standardize flammability testing on adhesive and syntactic-containing composite components include ... 

The second aspect of prosody is called augmentative prosody. The basic purpose of this is to augment the verbal component. Taking a simple example first, we see that many sentences are highly confusable with respect to syntactic structure. In sentences such as... 

Without any semantic (or domain specific) knowledge of the system it is possible to create a block definition diagram in SysML, see Figure 3. By defining closed areas in the original diagram (Figure 1) to be components, i.e. blocks of the BDD, it is possible to create the BDD based on syntactic decisions. 

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