Effect of matrix composition

In the region near zero thickness, there is no effect of matrix composition, and Equation 7-1 should be valid. The justification for this statement follows. The deviations under discussion rest ultimately upon x-ray absorption. Because x-ray absorption in this region is negligible, its only measurable result being the direct excitation of the analytical line, there should be no deviations from Equation 7-1. 

Table I. Effect of Matrix Composition on the Contaminant Selectivity Yields of Low Surface Area Non-Zeolitic Materials...

Table II. Effect of Matrix Composition and Surface Area on Contaminant Selectivity Yields of Non-Zeolitic Silica-Aluminas...

The low H/C-ratio of FCC feed derived from liquefied biomass led to low conversion and poor gasoline selectivity. Addition of alumina to the matrix resulted in a catalyst more active for heavy oil cracking but with a poor selectivity. Alumina-montmorillonite catalysts showed activities for heavy oil cracking comparable to that of a conventional, zeolite based, cracking catalyst. Effects of matrix composition and zeolite type on the heavy oil cracking performance are discussed. 

Mei] Mei, Z., Yan, Y.W., Cui, K., Effect of Matrix Composition on the Microstructure of in-situ Synthesized TiC Particulate Reinforced Iron-based Composites , Mater. Lett., 57(21), 3175-3181 (2003) (Experimental, Meehan. Prop., Morphology, Thermodyn., 15)... 

Fig. 21. Uniaxial tensile stress-strain behavior of HIPS/PS/PXE blends at 20°C showing the effects of matrix composition. Strain rate 4 x 10 s (29). To convert MN/m to psi, multiply by 145. Courtesy of Applied Science Publisher Ltd.

Figure 8.38 The effect of matrix composition on the stress-strain curves of AR-GRC composites containing 5% by weight fibres, after ageing in natural environment (after Majumdar [17]). (a) Portland cement (b) alumina cement (c) supersulfated cement (d) Portland + 40%flyash (e) polymer modified cement.

Figure 11.12 The effect of matrix composition (paste vs. mortar) in room temperature cured cellulose-pulp composites on the (a) flexural strength and (b) toughness (after Coutts [46]).

Figure 11.20 Effect of matrix composition and ageing on the strength and toughness relative to the control of sisal-cement composite normal-untreated matrix, carbonation curing of composite and silica fume slurry treatment of fibres (adopted from the data of Filho etal. [67]). Control-28 days of normal curing water-322 days in water wet/dry-46 cycles natural-outdoor exposure.

Battista, S., D. Guarnieri, C. Borselli et al. 2005. The effect of matrix composition of 3D constructs on embryonic stem cell differentiation. Biomaterials 26(31) 6194-207. 

Ethylene-vinyl acetate Fetterman [37] reinforced compounded ethylene-vinyl acetate (EVA) copolymer by using short hbers and found that silane coupling agents were effective at establishing improved hber-matrix adhesion. Das et al. [38] prepared carbon fiber-filled conductive composites based on EVA and studied the electromagnetic interference shielding effectiveness of the composites. 

The samples to be distributed must be generally similar in matrix to the unknown samples that are routinely analysed (in respect of matrix composition and analyte concentration range). It is essential they are of acceptable homogeneity and stability. The bulk material prepared must be effectively homogeneous so that all laboratories will receive samples that do not differ significantly in analyte concentration. The co-ordinating laboratory should also show the bulk sample is sufficiently stable to ensure it will not undergo... 

The effect of overall composition of the sample on the analysis of one component is known as the matrix effect. 

Buttal, T., Bac, N., and Yilmaz, L. (1995) Effect of feed composition on the performance of polymer-zeolite mixed matrix gas separation membranes. Sep. Sci. Technol, 30 (11), 2365-2384. 

In short fiber composites, energy absorption mechanisms, such as interfacial debonding and matrix cracking, most often occur at the fiber ends (Curtis et al., 1978). The damage model proposed by Bader et al. (1979) assumes that short fiber composites fail over a critical cross-section which has been weakened by the accumulation of cracks, since the short fibers bridging this critical zone are unable to carry the load. In fatigue loading, sudden fracture takes place as a direct result from the far-field effect of the composite, rather than due to the near field of the crack tip... 

Russell, A.J. and Street, K.N. (1987). The effect of matrix toughness on delamination static and fatigue fracture under mode I and II shear loading of graphite fiber composites. In Toughened Composites. ASTM STP 937 (N.J. Johnston ed.). ASTM, Philadelphia, PA, pp. 257-294. 

Fig.1. Effect of matrix properties on the tensile yield stress of particulate filled composites. Symbols (O) PVC, (A) LDPE filler CaC03,r=1.8 pm... 

In several cases, a fit of equation (2) to the data was not statistically significant, or the residuals indicated systematic deviations due to strongly curved release profiles. Then, alternatively a fit of equation (3) was tried in order to be able to describe tendencies which occur on variation of matrix composition. In all cases the first time interval was not considered, as burst effects are to be expected which are not representative for long-term drug release. 

As mentioned previously, one of the major concerns for glass-ceramics reinforced with continuous fibers is the effect of matrix cracks in oxidizing environments. An important parameter in this kind of composite is the... 

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