Fraction 30 samples, average

Figure 12 shows the dependence of the average aspect ratio and the TLCP volume fraction on the relative sample thickness for the four processing conditions in the core layer, transition layer and skin layer, respectively, by a morphological examination [13]. Generally, the aspect ratio increases from core to skin layer, whereas the situation is reversed for the volume fraction. An average volume fraction about 20% can be clearly seen. 

It is important to use well-fractionated samples for the purpose of determining the value of in the manner set forth above. If the sample includes species covering a considerable range in molecular weight, then the nature of the averages of the measured quantities, ( y/2 required by Eq. (23) assumes mportance. It may be... 

Sample Sample ID Sample wt. Sample DM Fractional sample DM S dry wt. Sample ash %. Fractional ash Sample OM Residual wt. Residual ash Residual OM OMD g/kg DOMD g/kg DM DMD g/kg Average... 

Product characteristics and motor-fuel properties. The motor-fuel properties of bench-fractionated alcohols from the demonstration plant have also been examined. Table V presents the composition of the average representative fractionated sample. Its purity is 99.3 similar to that of the raw alcohols before fractionation, with 35.8 wt % and 0.16 % water. 

Figure 3. Average percent contribution of each source to the total average mass. The data are the fine- (( e(t) average mass = 29.4 iig/m ) and coarse-fraction ffrightj average mass = 32.5 jig/m ) samples from RAPS Station 112 for July and...

Estimated relative errors are 0.2% for temperature, 5% for pressure, 4% for carbon dioxide mole fraction in the liquid phase, and 10% for lemon oil mole fraction in the vapor phase. Relative error is defined as experimental error divided by sample average val ue. 

The degree of mixing defined as the variance of the mass fraction of sand in the mix needs to be determined. It has to be compared with the variance for a fully segregated system and the ideal variance of a random mix. First, the random sample variance [Eq. (21-60)] is calculated, and with it an upper limit for the true variance can then be laid down. The sand s average concentration p in the whole 3-ton mix is estimated by using the random sample average l ... 

Samples weighing 2-5 mg are then dissolved in 5-molar nitric acid. The strontium fraction is purified using ion-specific resin and eluted with nitric acid followed by water. This solution is loaded onto a titanium filament for placement in the instrument (Fig. 4.20). Isotopic compositions are obtained on the strontium fraction thermal ionization mass spectrometer (TIMS). This is a single focusing, magnetic sector instrument equipped with multiple Faraday collectors. Strontium is placed on a thin filament and measured. Sr/ Sr ratios are corrected for mass fractionation using an exponential mass fractionation law. Sr/ Sr ratios are reported relative to a value of 0.710250 for the NIST 987 standard (e.g., if the Sr/ Sr ratios for the standards analyzed with the samples average 0.710260, a value of 0.000010 is subtracted from the ratio for each sample). 

In summary, the effect of radioelement heterogeneity on He/ He in most systems is probably small. There is some evidence from the Cammenellis system that fractionation of He/He due to preferential He release could be as high as a factor of 10, but taking into account the evidence for radioelement element heterogeneity this is more reasonably, at most, a factor of 3 (e g., Tolstikhin et al. 1996). In large cmstal fluid systems reasonably sampling average cmst, He/ He ratios in excess of 1-3 x 10 (i.e., more than three times the upper cmst value) are due to a resolvable He excess from sources external to the cmst (e.g., Marty et al 1993). 

Characterization. Number average molecular weights of the block copolymers in toluene were determined at 25 °C by a Mechrolab high speed membrane osmometer fitted with an 0-8 membrane. Styrene mole fractions in the block copolymers were determined by H -NMR in CC14 at 60°C. To determine the effect of fractionation procedure, sedimentation patterns of tetra-hydrofuran solutions of fractionated samples were examined using a Spinco model E ultracentrifuge at 59,780 rpm. 

The ratio of residual and nonresidual associations in a sediment sample will allow early estimations of the bioavailability of trace metals. In Table II, we compare the metal concentrations in the total sediment samples and within the nonresidual phases, with the latter as average values from the grain size fractionated samples. It is shown that as the metal concentrations in the Rhine River sample are enriched because of pollution influences (except for manganese where diagenetic effects are probably involved), there is a distinct increase in the nonresidual metal fraction. This is mainly valid for copper, lead, and zinc, of which more than 90% in the Rhine River sample can be considered as being potentially remobilizable under natural conditions. Most readily available for biological processes are the metal cations in water-soluble and easily extractable forms copper is typically enriched in these chemical phases in both samples. 

The nonthermal reactivities of Ha and Cla can be assessed from competitive gas-phase recoil F experiments with CF4. If either substance exhibits significant nonthermal reactivity, then its addition to CF4 would be accompanied by a characteristic composition-dependent decrease in the organic product yield (9). From Table I the organic yields exhibit no dq>endence on Cla concentration. The 5.41% dt 0.12% average from nine independent measurements with CF4 at 0.100 Cla mol fraction is equivalent to the 54-sample average of 5.24% 0.07%. In the presence of 0.475 mol fraction of Ha, however, the organic yield in CF4 decreases from 5.24% 0.07% to 4.01% 0.05%, and the product distribution also changes (3,12,19). 

The results obtained using florisil with hexane as the elution solvent are summarized in Figure 4. Triplicate experiments with radiolabeled heptachlor suggested that 93.6% 6.7 of the I C-labeled heptachlor was recovered in the 20 mL wash with only a few % of the starting mass in this fraction. The average inhibition observed when nonspiked beef-fat samples were analyzed using this method in the cELISA was 25, 6%. However, in contrast to the acid alumina results, these samples when spiked with heptachlor showed an increased inhibition in the cELISA proportional to the spike. 

Mn obtained from osmotic pressure determinations, we derive a value of in equation (16) which is too large. Many of the viscosity constants given in Staudinger s earlier work have thus been revoked in his later papers. Similarly, the value of tg 20 in experiments on the extinction angle will always be smaller than that found in a uniform sample with the same weight average. A reliable check can only be performed in sharply fractionated samples, or in samples where the distribution of molecular weight is known. 

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