Big Chemical Encyclopedia

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

Articles Figures Tables About

Pivoting data

Informatic environment pivotal data management for each of the preceding steps, which involves capture of data, storage in a consistent way, query and also stream data analysis (data workflow). [Pg.241]

The requirement for all the pivotal data to be generally available for scrutiny by the scientific community at large makes the process transparent and robust. The data on which the safety determination is based must be published in peer-reviewed scientific journals and could be supplemented by secondary scientific literature, such as review articles and text-... [Pg.68]

The elevation angle, and through appropriate data processing a, can be measured with a bivane (a vane pivoted so as to move in the vertical as well as the horizontal). Bivanes require frequent maintenance and caUbra-tion and are affected by precipitation and formation of dew. A bivane is therefore more a research instrument than an operational one. Vertical fluctuations may be measured by sensing vertical velocity w and calculating o- , from the output of a propeller anemometer mounted on a vertical shaft. [Pg.307]

The factory is modeled as a two-zone network with door, horiztmtally pivoted windows, and roof shed windows as airflow elements. The extract tan and the duct and hood are modeled as additional airflow elements. Wind pressure coefficient data are taken from literature for a simple rectangular buihl-ing shape surrounded by buildings of equal height. [Pg.1091]

Bockris and Parry-Jones were the first to carry out experiments with a pendulum to measure the friction between a wetted substrate and the pivot upon which the pendulum swung. It should be noted that Rebinder and Wenstrom199 used such a device for an objective similar to that of Bockris and Parry-Jones, but they claimed that the characteristics of the pendulum oscillations reflected the hardness of the solid surface. The plastic breakdown determining this would be a function of v and this is a potential-dependent value.100, 01 More extensive determinations were made later by Bockris and Argade200 the theoretical treatment was given by Bockris and Sen.201 In the absence of adjustable parameters in the theory, a good agreement between theory and experimental data was assumed.201 The studies by Bockris and Parry-Jones indicated that the... [Pg.40]

Statistical and algebraic methods, too, can be classed as either rugged or not they are rugged when algorithms are chosen that on repetition of the experiment do not get derailed by the random analytical error inherent in every measurement,i° 433 is, when similar coefficients are found for the mathematical model, and equivalent conclusions are drawn. Obviously, the choice of the fitted model plays a pivotal role. If a model is to be fitted by means of an iterative algorithm, the initial guess for the coefficients should not be too critical. In a simple calculation a combination of numbers and truncation errors might lead to a division by zero and crash the computer. If the data evaluation scheme is such that errors of this type could occur, the validation plan must make provisions to test this aspect. [Pg.146]

Parameter estimation to fit the data is carried out with VARY YM Y1 Y2, FIT M, and OPTIMIZE. The result is optimized values for Ym (0.7835), Y1 (0.6346), and Y2 (1.1770). The statistical summary shows that the residual sum of squares decreases from 0.494 to 0.294 with the parameter optimization compared to that with starting values (Ym=Yl=Y2=l. 0. ) The values of after optimization of Ym, Yl, and Y2 are shown in Figure 2, which illustrates the anchor-pivot method and forced linearization with optimization of the initiator parameters through Yl and Y2. [Pg.314]

Steady performance data from the second reactor are shown in Figure 11.10, where the pressure drop did not rise exponentially and the conversion and selectivity remained at 75 and 83%, respectively. The reactor was further analyzed after operation, shown in Figure 11.11, to confirm the lack of carbon deposition. Reactor models were pivotal to developing a robust design for this high-temperature and... [Pg.250]

The most likely way for pardaxin molecules to insert across the membrane in an antiparallel manner is for them to form antiparallel aggregates on the membrane surface that then insert across the membrane. We developed a "raft"model (data not shown) that is similar to the channel model except that adjacent dimers are related to each other by a linear translation instead of a 60 rotation about a channel axis. All of the large hydrophobic side chains of the C-helices are on one side of the "raft" and all hydrophilic side chains are on the other side. We postulate that these "rafts" displace the lipid molecules on one side of the bilayer. When two or more "rafts" meet they can insert across the membrane to form a channel in a way that never exposes the hydrophilic side chains to the lipid alkyl chains. The conformational change from the "raft" to the channel structure primarily involves a pivoting motion about the "ridge" of side chains formed by Thr-17, Ala-21, Ala-25, and Ser-29. These small side chains present few steric barriers for the postulated conformational change. [Pg.362]

The correct interpretation of measured process data is essential for the satisfactory execution of many computer-aided, intelligent decision support systems that modern processing plants require. In supervisory control, detection and diagnosis of faults, adaptive control, product quality control, and recovery from large operational deviations, determining the mapping from process trends to operational conditions is the pivotal task. Plant operators skilled in the extraction of real-time patterns of process data and the identification of distinguishing features in process trends, can form a mental model on the operational status and its anticipated evolution in time. [Pg.213]

Task /. Extraction of pivotal, temporal features from process data. [Pg.213]

The extraction, though, of the so-called pivotal features from operating data, encounters the same impediments that we discussed earlier on the subject of process trends representation (1) localization in time of operating features and (2) the multiscale content of operating trends. It is clear, therefore, that any systematic and sound methodology for the identification of patterns between process data and operating conditions can be built only on formal and sound descriptions of process trends. [Pg.214]

As an aside, Microsoft Excel s pivot-point year is 1930 by default. So, if you enter an implicit century date in Excel such as 01/01/29, it understands that as 01/01/2029, but 01/01/30 is understood as 01/01/1930. This is useful to know when implicit century data pass through Excel into SAS in some fashion. [Pg.114]

The information requirements for products such as prolonged-release oral dosage forms will depend on whether or not it has been possible, during the development of the product, to establish an in vivo-in vitro correlation between clinical data and dissolution studies. In vivo-in vitro correlations should be attempted using product at different stages of development, but bioavailability and pharmacokinetics data from pivotal clinical studies using at least pilot-scale production materials and possibly routine production material are particularly important. Where it is not possible to establish an in vivo-in vitro correlation, additional data will be required to compare the bioavailability of product developed at laboratory scale, pilot scale, and production scale. In the absence of an in vivo-in vitro correlation, the dissolution test will be a quality control tool rather than a surrogate marker for in vivo performance of the product. [Pg.655]


See other pages where Pivoting data is mentioned: [Pg.371]    [Pg.87]    [Pg.409]    [Pg.133]    [Pg.29]    [Pg.371]    [Pg.87]    [Pg.409]    [Pg.133]    [Pg.29]    [Pg.45]    [Pg.131]    [Pg.1121]    [Pg.1309]    [Pg.217]    [Pg.69]    [Pg.137]    [Pg.92]    [Pg.8]    [Pg.240]    [Pg.301]    [Pg.3]    [Pg.148]    [Pg.780]    [Pg.350]    [Pg.898]    [Pg.183]    [Pg.268]    [Pg.23]    [Pg.169]    [Pg.14]    [Pg.320]    [Pg.326]    [Pg.364]    [Pg.90]    [Pg.218]    [Pg.653]    [Pg.12]    [Pg.253]    [Pg.343]   
See also in sourсe #XX -- [ Pg.409 ]

See also in sourсe #XX -- [ Pg.409 ]




SEARCH



Pivot

Pivoting

© 2024 chempedia.info