Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Detailed Analysis

In principle, nucleation should occur for any supersaturation given enough time. The critical supersaturation ratio is often defined in terms of the condition needed to observe nucleation on a convenient time scale. As illustrated in Table IX-1, the nucleation rate changes so rapidly with degree of supersaturation that, fortunately, even a few powers of 10 error in the preexponential term make little difference. There has been some controversy surrounding the preexponential term and some detailed analyses are available [33-35]. [Pg.335]

Detailed analyses of the above experiments suggest that the apparent steps in k E) may not arise from quantized transition state energy levels [110.111]. Transition state models used to interpret the ketene and acetaldehyde dissociation experiments are not consistent with the results of high-level ab initio calculations [110.111]. The steps observed for NO2 dissociation may originate from the opening of electronically excited dissociation chaimels [107.108]. It is also of interest that RRKM-like steps in k E) are not found from detailed quantum dynamical calculations of unimolecular dissociation [91.101.102.112]. More studies are needed of unimolecular reactions near tln-eshold to detennine whether tiiere are actual quantized transition states and steps in k E) and, if not, what is the origin of the apparent steps in the above measurements of k E). [Pg.1035]

The market penetration of synthetic fuels from biomass and wastes in the United States depends on several basic factors, eg, demand, price, performance, competitive feedstock uses, government incentives, whether estabUshed fuel is replaced by a chemically identical fuel or a different product, and cost and availabiUty of other fuels such as oil and natural gas. Detailed analyses have been performed to predict the market penetration of biomass energy well into the twenty-first century. A range of from 3 to about 21 EJ seems to characterize the results of most of these studies. [Pg.13]

As noted later on in this chapter, there are other software options that can be downloaded for more sophisticated and detailed analyses. [Pg.300]

Legal Compliance. Bounding (I) or detailed analyses (2) may be used to show compliance with nntional and regional measures, e.g., the PSM Rule. ... [Pg.294]

For a major incident investigation using a comprehensive root cause analysis system, teams will be formed to acquire information relevant to determine the structure and analyze the causes in depth. In addition to evaluations of the immediate causes, imderlying causes are likely to be evaluated by investigations in areas such as safety and quality management. Both paper- and computer-based systems will be used to acquire and record information for subsequent detailed analyses. [Pg.267]

Although desulfurization is a process, which has been in use in the oil industry for many years, renewed research has recently been started, aimed at improving the efficiency of the process. Envii onmental pressure and legislation to further reduce Sulfur levels in the various fuels has forced process development to place an increased emphasis on hydrodesulfurization (HDS). For a clear comprehension of the process kinetics involved in HDS, a detailed analyses of all the organosulfur compounds clarifying the desulfurization chemistry is a prerequisite. The reactivities of the Sulfur-containing structures present in middle distillates decrease sharply in the sequence thiols sulfides thiophenes benzothiophenes dibenzothio-phenes (32). However, in addition, within the various families the reactivities of the Substituted species are different. [Pg.396]

Further detailed analyses of the ECA data have been extrapolated to USA national costs (Rice and Miller, 1998). It was calculated that the economic costs of mental disorders in 1990 in the USA totalled US 147.8 billion. Anxiety disorders were the most cosdy, amounting to 46.6 billion, just under a third of the total. Direct costs spent on mental health care totalled 67 billion, of which anxiety disorders accounted for only 11 billion (16.5%). Drug costs were 2191 million, of which anxiety disorders accounted for 1167 million—over half Morbidity costs—the value of goods and services not produced because of mental disorders — amounted to 63.1 billion, with anxiety disorders accounting for 34.2 billion, 54.2% of the total. This reflects the high prevalence of anxiety disorders in the community and the high associated rate of lost productivity. In contrast, patients with affective disorders appeared better able to function (Rice and Miller, 1995). In summary, anxiety disorders are common, disruptive and costly to society drug treatment is a substantial element of treatment costs (11%) compared with, say, schizophrenia (2.2%). [Pg.60]

Zavarin and his associates have described detailed analyses of the terpenoid constituents of several species of fir. We can start with their study of A. amabilis collected throughout the range of the species (Zavarin et al., 1973). The Pacific silver fir occurs from southeastern Alaska to northern California at mid to higher elevations with a major contribution to the forest flora in coastal British Columbia, the Olympic Mountains (Washington), and in the Cascade Mountains in Washington and Oregon. It is represented in California in only a few sites in the north. Analysis of cortical terpenoids from over 100 trees from 15 sites revealed a comparatively... [Pg.142]

Included in this table are criteria related to kinase inhibition, including detailed analyses of reversibility, detergent effects, and competition with ATP. Also listed are criteria for selectivity, cellular activity, and the physicochemical and in vitro ADME profiles. The final two criteria require the lead to be part of a series of compounds with demonstrated SAR. [Pg.182]

The information requirements for each successive step in the screening process build upon those for the preceding steps. The user has the choice of collecting this information all at one time or in phases. Because the information necessary for the more detailed analyses, such as quantitative... [Pg.91]

To provide sufficient data to allow treatment alternatives to be fully developed and evaluated during the detailed analyses, and to support the remedial design of a selected alternative... [Pg.602]

Although the above is a highly simplified summary of the detailed analyses undertaken and the inter-relationships found between these, it emphasises the roles of the complementary and confirmatory techniques. One conclusion from the researchers was that 2D-LC was the most promising technique to detect PC degradation at an early stage. [Pg.444]

The components of nucleic acids have been the subject of continuous DFT stud-ies61 S5,67 69. Jasien and Fitzgerald calculated dipole moments and polarizabilities for a series of molecules of biological interest including nucleic acid bases (adenine, thymine, cytosine, and guanine) and their pairs (adenine-thymine and cytosine-guanine)61. A good correlation between DFT(HL), experimental, and MP2 results was obtained for dipole moments and polarizabilities. More detailed analyses of DFT(SVWN) and DFT(B88/P86) results, which included vibrational frequencies, were reported for isolated bases and their... [Pg.92]

Detailed analyses of expansions of paralogous proteins are important not only from a diagnostic perspective (identifying members of gene families unique to specific organisms), but also from a therapeutic perspective (developing vaccines and... [Pg.19]

Detailed analyses of a combination of n3Cd and 31P MAS-NMR and spin-echo measurements and 113Cd-31P SEDOR experiments led to the conclusions that,... [Pg.259]


See other pages where Detailed Analysis is mentioned: [Pg.2268]    [Pg.2911]    [Pg.10]    [Pg.640]    [Pg.159]    [Pg.476]    [Pg.12]    [Pg.1161]    [Pg.423]    [Pg.397]    [Pg.10]    [Pg.749]    [Pg.236]    [Pg.305]    [Pg.7]    [Pg.270]    [Pg.276]    [Pg.48]    [Pg.287]    [Pg.375]    [Pg.266]    [Pg.37]    [Pg.451]    [Pg.558]    [Pg.259]    [Pg.45]    [Pg.54]    [Pg.95]    [Pg.252]    [Pg.214]    [Pg.89]    [Pg.55]    [Pg.23]    [Pg.241]    [Pg.305]   
See also in sourсe #XX -- [ Pg.188 ]




SEARCH



Details analysis

© 2024 chempedia.info