Evaluation of homogeneity

Kane JS, Siems DF, Arbogast BF (1992) Geochemical exploration reference samples GXR-r to GXR-4 and GXR-6 evaluation of homogeneity based on high precision analyses. Geostds Newslett 16 45-54. 

Lin MJ, Hoke C, Ettinger B. Evaluation of homogeneous high-density lipoprotein cholesterol assay on a BM/Hitachi 747-200 analyzer. Clin Chem 1998 44 1050-2. 

Conventional cyclic voltammetry s greatest utility is in the diagnosis of electrode reactions involving chemical complications, and the ac variant is also useful in meeting this kind of problem. The ratio /p,r//p,f is a sensitive indicator of product stability, just as the dc voltammetric ratio l/p,r/ p,f I is. However, the ac ratio is easier to measure precisely, and it lends itself well to quantitative evaluation of homogeneous rate constants. 

An experimental evaluation of homogeneous continum models of steady state heat transfer in packed beds of low tube/particle diameter ratio has been carried out. It was found that both axial and radial conduction effects were important in such beds for N j 500, which covers the flow range in many industrial reactors. Heat transfer resistance at the wall was significant, but of secondary importance. 

Objective Evaluation of Color. In recent years a method has been devised and internationally adopted (International Commission on Illumination, I.C.I.) that makes possible objective specification of color in terms of equivalent stimuli. It provides a common language for description of the color of an object illuminated by a standard illuminant and viewed by a standard observer (H). Reflectance spectro-photometric curves, such as those described above, provide the necessary data. The results are expressed in one of two systems the tristimulus system in which the equivalent stimulus is a mixture of three standard primaries, or the heterogeneous-homogeneous system in which the equivalent stimulus is a mixture of light from a standard heterogeneous illuminant and a pure spectrum color (dominant wave-length-purity system). These systems provide a means of expressing the objective time-constant spectrophotometric results in numerical form, more suitable for tabulation and correlation studies. In the application to food work, the necessary experimental data have been obtained with spectrophotometers or certain photoelectric colorimeters. 

There are some aspects of process design in which decisions are based primarily on past experience rather than on quantitative performance models. Problems of this type include the selection of constraction materials, the selection of appropriate models for evaluating the physical properties of homogeneous and heterogeneous mixtures of components, and the selection of safety systems. Advances in expert systems technology and information management will have a profound impact on expressing the solutions to these problems. 

Filey RH, Nguyen S, Campbell S, Bragg A and Grimm CA (1987) Evaluation of sample homogeneity for geochemical standard reference materials used in microanalysis. J Radioanal Nud Chem Artides 110 147-158. 

Mao Xueying, Chai Chieang (1995) Evaluation of the homogeneity of the environmental standard reference material - Estuarine Sediment SRM 1646 by INAA and SRXRF. Fresenius J Anal Chem 352 174-178. 

The homogeneity determination of the bacteria in the materials is performed by viable count followed by statistical evaluation of the cormts of sub-samples from the same capsule solution and of total counts of different capsules of one batch. An example for the homogeneity determination for a batch of capsules containing Enterococcus faecium is also presented in (Janning et al. 1995). 

Gloaguen F, Convert P, Gamhurzev S, Velev OA, Srinivasan S. 1998. An evaluation of the macro-homogeneous and agglomerate model for oxygen reduction in PEMFCs. 

Some approximations are required. First, the evaluation of the integral in Eq. (3.10) within the simulation box with periodic continuation conditions is approximated by a sum of local contributions. This sum is calculated over Np test points x. 1 < k < Np which are homogeneously distributed on a three-dimensional grid covering the entire simulation box and is given by ... 

The pressure drop over a given length of pipe must be determined by a stepwise procedure, as described for homogeneous flow. The major additional complication in this case is evaluation of the holdup (ipm) or the equivalent slip ratio (S) using one of the above correlations. 

F. Perez-Balderas, J. Morales-Sanfrutos, F. Hemandez-Mateo, J. Isac-Garcia, and F. Santoyo-Gonzalez, Click multivalent homogeneous neoglycoconju-gates—Synthesis and evaluation of their binding affinities, Ear. J. Org. Chem., 2009 (2009) 2441-2453. 

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