Fixed structure type

A composite type is an enumeration type, a fixed structure type, a list type or a class type. 

An enumeration type is a finite enumeration of constants. The enumeration type is denoted by the sequence ENUM(e1,. ..eN) where N denotes the cardinal number of the enumeration type and el,. ..eN denote the constant elements of the enumeration type. N has to be greater than 1. Than a structure attribute (parameter) of enumeration type E has any constant element of E as value. Enumeration type are members of the type class ATTRIBUTE. 

A constants of a fixed structure type (called fixed structures) is a finite collection of structure attributes, where the structure attributes can be 

In case of scoped entities (see Scope on page 11) the corresponding structure attribute definitions are enclosed by the reserved words SCOPE and END. SCOPE. 

STRUCTURE SCOPE attr types END SCOPE attr defs END  

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The constant set of NIL is empty. This implies that for example structure attributes (see "Fixed structure type" on page 25) of type NIL are useless in relation to the corresponding structure. In the example below, for entities of type POINT(D2) (two dimensional points) the third structure attribute dimz (z-dimension) has no meaning. 

In contrast to a structure type (see "Fixed structure type" on page 25), at least one of the structure attribute types of a parametric structure type is a generic parameter. 

In fixed structures, as described in "Fixed structure type" on page 25, the sequence of the attribute definitions is fixed. In case of a variant structure type the structure attribute number and the structure attribute definitions of the structure type can be dependent on the value of variant parameters. A variant structure attribute definition is denoted by the sequence... 

A wide range of organic pollutants can be adsorbed by MFl, Y and mixtures of the two structure types. In the VOC application fixed beds are comparatively few with most VOC adsorption being done by rotary adsorbers such as are built and sold by Seibu Giken. A few words about rotary adsorption applications follow in Section 9.7. 

The objective function is nonlinear and nonconvex and hence despite the linear set of constraints the solution of the resulting optimization model is a local optimum. Note that the resulting model is of the MINLP type and can be solved with the algorithms described in the chapter of mixed-integer nonlinear optimization. Yee and Grossmann (1990) used the OA/ER/AP method to solve first the model and then they applied the NLP suboptimization problem for the fixed structure so as to determine the optimal flowrates of the split streams if these take place. 

Derivatives of polycyclic hydrocarbons have played a central role in the development of physical organic chemistry 29°). Polycyclic substrates have been found to be ideal models for numerous quantitative investigatious since their conformations are generally rigid and fixed and since they provide a large variation in structural types. Recent, comprehensive reviews of bridgehead reactivity are available 187> 291f... 

Obika S, Nanbu D, Hari Y, Morio JAK, Doi T, Imanishi T. Stability and structural features of the deplexes containing nucleoside analogues with a fixed N-type conformation, 2 -0,4 -C-methy-leneribonucleosides. Tetrahedron Lett. 1998 39 5401-5404. 

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