INDEX material selection

However, in general these fabrication and performance advantages are common to all plastics and so a decision has to be made in regard to which plastic would be best for a particular application. Rather than compare the basic raw material costs it is better to use a cost index on the basis of the cost to achieve a certain performance. Consider again the material selection procedures illustrated in Section 1.4.1 in relation to strength and stiffness. 

Refractive Index of Selected Materials CERAMICS, GLASSES, AND IONIC SOLIDS ... 

Materials selection for centrifugal pumps is contained in API 3 610, Appendixes E and F. Another source of information is API s Guide for Inspection of Refinery Equipment, Chapter II. In addition, both NACE Group Committee T-8 on Refining Industry Corrosion and the API Corrosion Committee publish minutes of their semiannual meetings. An index of Group Committee T-8 s minutes has been produced so that information on any topic discussed can be located. 

Physicochemical Interactions between permeating molecules and the macromolecules which comprise the membrane structure are considered. Dispersive, polar and hydrogen-bonding Interactions are used to establish an Index which can be useful In membrane material selection. A number of material characterization and evaluation procedures are outlined. 

In addition to their inclusion in the CAS databases, CAS Registry Numbers are used in many public and private databases. Currently, the cluster of databases on STN International containing Registry Numbers includes 7 CAS databases and 53 non-CAS databases. Among the latter are such diverse files as AIDSLINE, BIOSIS, Design Institute for Physical Property Data File (DIPPR), MEDLINE, Natural Products Alert (NAPRALERT), Pharmaceutical News Index (PNI), and Plastics Materials Selection Database (PLASPEC). 

Block polymers containing an etchable block have been used as precursors for nanoporous polymers [109]. Because nanoporous polymers have large internal surface areas, large pore volumes, and uniform pore dimensions, these materials were studied as separation/pmilication media, batteiy separators, templates for nanostructured materials, low dielectric materials, and low refractive index materials. Both pore wall functionality and robustness of the matrix are important for the practical use of nanoporous polymers. As shown in Eig. 5.16, PLA was selectively etched horn a blend with reactive block co-polymers to form a nanoporous material. 

Here, p is the pitch of the helical structure. An is the birefringence of the medium and n is the average refractive index, (rio+n ll. The temperature range over which the cholesteric material selectively reflects visible light is known as the color play of the material. The temperature dependence of the... 

Scheffer and Nehring proposed a useful index/, for selecting a host material to give lower operating voltage by combining the linear relationship of versus An for a fixed contrast and the threshold voltage relationship with material parameters. 

Table 7.1 Limiting Oxygen Index of Selected Materials (3, p.396)...

Both shape and materials selections should be carried out together since shaping depends on the type of material - for example ceramics are more difficult to shape than metals. Let us concentrate on mechanics, which is the focus of the book, and more precisely now on the mechanical design that has been extensively reviewed by Ashby (2001). Several performance indices are listed in Table 2.5 according to the application. At this stage, these indices do not yet consider shape. Let us take an example to determine the performance index and determine how shape influences this performance. This will allow us to introduce the shape factor and hence understand how shape contributes to object strength. 

Example 3.1 determined the strength-weight ratio of five materials of construction. Determine the strength-conductivity ratio of these same five materials. Rank order these materials from the most desirable material to the least desirable by these two criteria. Develop another index of merit for material selection that combines both of these criteria e.g., one that includes Sy, and p. 

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