Relative importance for

The values of R similarly calculated for hydrogen chloride and hydrogen bromide, with the substitution of X31(r) and X (r) for X21 (r) in equation (37), are somewhat larger than the experimental ones. This indicates that the deforming effect of the hydrogen ion on the halide ions is of greater relative importance for these ions than for the fluoride ion. 

Assuming that no significant in-situ degradation of PCBs occurs (k htm = photo = Kio = 0 ) three elimination pathways remain which, if described in terms of first-order reaction rates, can be directly compared with respect to their relative importance for the elimination of each PCB congener from the water column. As shown by the removal rates listed in Table 23.4, for both compounds the flux to the atmosphere is by far the most important process. Because of its larger Kd value, removal of the heptachlorobiphenyl to the sediments is predicted to be also of some importance. By the way, from this simple model we would expect to find the heptachlorobiphenyl relatively enriched in the sediments compared to the trichloro-biphenyl. We shall see later whether this is true. 

As shown above, the concentration of a compound that is transported in a river is affected by various mixing and elimination processes. Their relative importance for reducing the riverbome mass flow and the maximum concentration depends on the characteristics of the river as well as on the compound under consideration. This section gives a summary of the relevant rate constants by emphasizing the simplest descriptions. In order to compare their relative importance, all processes will be approximated by first-order rate constants, either in time (fc-rates, dimension T-1) or in space along the river (e-rates, dimension L 1). 

We will now consider successively the different reactions (4) and (5) of this reaction scheme in order to examine what is their relative importance for obtaining block or graft copolymers. Initially it was admitted that the graft copolymers were produced only by reaction (4b), considering that in the competition between monomer and substrate for primary initiator radicals the addition of vinyl monomers [reaction (2)] is much easier than the abstraction of an atom of another molecule [reaction (4 a)]. This assumption is based on the higher value of the activation energy for a chain transfer reaction than for a monomer addition, at least in the case of saturated molecules (88). 

The mixture of organic constituents in the marine environment is extremely complex. Their origin is partly terrigenuous many compounds are produced in the marine environment itself. The different sources and their relative importance for the complexation of trace metals in estuaries, coastal seas and open ocean are riverine input, runoff from the coastal zone, resuspension, import of water mases, atmospheric input and in situ biological production. 

An interesting test of resonance structures and their relative importance for acyl halides is suggested by the consideration of substituted derivatives. Parallelling equation 36 is equation 38. 

Despite the fact that pyrrole cannot be considered as a direct model for nucleic acid bases, it is particularly interesting because it contains two completely different reaction paths also present in 9H-adenine, namely the out-of-plane deformation and the H-detachment [7, 8], In pyrrole, these two paths are energetically available after tttt excitation. Therefore, the question concerning their relative importance for the photodynamics needs to be answered. 

There is no way of determining between this choice, but, where the various contributions to the energies of 1 and 2 have been Hsted then these contributions are of the same relative importance for 1 and 2. Thus it is possible to make a useful discussion of barrier heights, though, unaware of the conformation of the transition state. We shall discuss ring inversion in terms of 1 on the understanding that 2 ought also to be considered on similar terms mutatis mutandi. 

These results suggest that the influence on the hydrogenation reactions of the addition of phosphorus to catalysts should depend strongly on the molecules being converted, on the nature of the active sites, and on the reaction conditions (as noted for HDN). However, addition of phosphorus seems predominantly to increase aromatic hydrogenation, as has been shown for the HDN reaction networks. The effect of hydrogen partial pressure is inferred to be relatively important for hydrogenation reactions... 

The primary technical limitation on the accuracy of molecular weights so determined is the sedimentation constant. Since the molecular weight is directly proportional to the sedimentation constant, where S is low, small errors in S will be relatively important. For -dextrin with S = 0.47, if S is in error by only 0.02 (an average error for measurements of this sort) this will give an error of 50 in the molecular weight. A second essential factor which so far has not been determined with high precision is the partial specific volume of the carbohydrate. Nevertheless, it has been possible to obtain molecular weights which are within a few perct nt of the theoretical values (see Table IV). 

As one of its major interests, a model represents an efficient tool for the kinetic analysis of cellular processes. It is able to account for the main phenomena that may simultaneously control the activities of cells. As such, depending on the culture conditions, composition of the medium and whether there is batch or continuous mode of operation, it can be used first to identify the rate-limiting factors and then to characterize quantitatively their relative importance. For instance, with a model it is possible to evaluate the kinetic effect of a depletion of glucose, glutamine and other amino acids or of an accumulation of ammonia and lactate on the rates of cell growth and death. 

Each relationship strength is multiplied by each CTQ importance rating and the products are summed to give a weighted relative importance for each feature. 

The reason there are so many Hund s cases is that each Hund s case corresponds to an arrangement of terms in H in order of relative importance. For each arrangement there is a different Hund s case. Since each Hund s case is associated with a complete set of commuting angular momentum operators, explicitly defined transformations between any two Hund s case basis sets may be specified independent of the details of a particular molecular example. 

The squares standard deviations can be weighted according to their relative importance (for example Oj can be divided by a characteristic value of the corresponding variable X ). It is important to realize here that the standard deviations O themselves are (due to possible reconciliation) complex functions of the selection of directly measured quantities and of their precision (standard deviations). The objective function (12.2.3) is thus strongly nonlinear. 

Lead exits the atmosphere through dry and wet deposition processes. Each mechanism for lead removal from ambient air has its own set of characteristics and differs in relative importance for impact on receiving environmental compartments and lead-exposed populations. The removal processes are reasonably well understood, particularly in terms of the physics of dry deposition (Friedlander, 1977 U.S. EPA, 1986). There are three zonal or layer elements in the dry precipitation process for lead removal the main airstream, the boundary surface, and the receiving surface. Each of these zones is viewed in terms of aerodynamic resistance, boundary layer resistance, and surface resistance. 

All these aspects have been partially or thoroughly treated in previous works so that their relative importance for the assessment of a reliable pore size distribution function can be evaluated [1,10]. On such a basis, it should be interesting to develop an efficient model which would be able to simulate adsorption data in a wide range of temperature and pressure... 

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