Composite type array

A composite type represents a collection of objects that are defined as either composite types or scalar types. These objects can be organized in two ways as an array or as a record. The objects in a composite type caimot be defined as either access or file types if the type is to be synthesized. 

As an array type can be declared to be of a composite type. It is possible to create an array of an array. Hence, there are two alternative ways of... 

An object mtist be declared to be certain type. Integer and enumeration types are available. These can be formed from a single element - a scalar type - or multiple elements - a composite type. A composite type can be organized as an array or a record. 

Array types can be used in the declaration of signals, variables and constants. How to make assignments to objects of this type is discussed later in this chapter in Box 5.4. As a precursor to that, this section looks at the ways in which the elements of composite types can be manipulated for use as targets or sources in assignment statements. Consider the types, subtypes and signals declared below. 

An aggregate expression constructs an array from scalar t5 es. A string expression may use objects of a composite type or explicitly specify the value to be stored in the array The common way to express a binary value is to use a siring literal viz. ... 

Hashin and Rosen [3-8] extended Hashin s work to fiber-reinforced composite materiais. The fibers have a circular cross section and can be hoilow or solid. Two cases were treated (1) identical fibers in a he gotiaLarray and (2) fibers of various diameters (but same ratio of insldeto outside diameter, if hollow) in a random array. The two types of arrays are depicted in Figure 3-21. In both cases, the basic anaiysis... 

All of the Type A and B inclusions studied are surrounded by a layered rim sequence of complex mineralogy [21] which clearly defines the inclusion-matrix boundary. Secondary alteration phases (grossular and nepheline, especially) are also a common feature of these inclusions, suggesting that vapor phase reactions with a relatively cool nebula occurred after formation of inclusions. Anorthite, in particular, is usually one of the most heavily altered phases the relationship between Mg isotopic composition and alteration is discussed below. (See [12] for striking cathodoluminesce photographs of typical Allende alteration mineralogy.) Inclusion Al 3510 does not fit the normal pattern as it has no Wark-rim and does not contain the usual array of secondary minerals. 

The types of macrocycles most studied in which the active metal center is believed to be retained include Co, Fe, Ru porphyrins and related macrocycles. In these studies the optimal pyrolysis temperature is often reported to be between 400-800 °C. Above these temperatures, the active site begins to be destroyed, and activity decreases.49 An array of characterization techniques have been used to support these claims. XPS analysis has demonstrated that at the highest activity of samples, the surface composition of metal and nitrogen is also at its highest.78,96 Above the optimal treatment temperature, nitrogen and metal begin to disappear from the surface. Furthermore, Mossbauer spectroscopy and XAS have been used to... 

Starch-plastic composites contain a mixture of two very different types of materials (/) hydrophobic, petrochemical-derived polymers (PE, EAA) known to be highly resistant to degradation by living organisms, and (i7) a hydrophilic, natural polymer (starch) that is easily broken down by a wide array of organisms. In the process developed by Otey (3), these fundamentally incompatible materials are forced into an intimate mixture during production of the plastic film. Since... 

A wide array of ferroelectric, piezoelectric and pyroelectric materials have titanium, zirconium and zinc metal cations as part of their elemental composition Many electrical materials based on titanium oxide (titanates) and zirconium oxide (zirconates) are known to have structures based on perovskite-type oxide lattices Barium titanate, BaTiOs and a diverse compositional range of PZT materials (lead zirconate titanates, Pb Zr Tij-yOs) and PLZT materials (lead lanthanum zirconate titanates, PbxLai-xZryTii-yOs) are among these perovskite-type electrical materials. 

---