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Parameters associated with the

Numerous attempts have been made to develop hybrid methodologies along these lines. An obvious advantage of the method is its handiness, while its disadvantage is an artifact introduced at the boundary between the solute and solvent. You may obtain agreement between experiments and theory as close as you desire by introducing many adjustable parameters associated with the boundary conditions. However, the more adjustable parameters are introduced, the more the physical significance of the parameter is obscured. [Pg.418]

The kinetic parameters associated with the synthesis of norbomene are determined by using the experimental data obtained at elevated temperatures and pressures. The reaction orders with respect to cyclopentadiene and ethylene are estimated to be 0.96 and 0.94, respectively. According to the simulation results, the conversion increases with both temperature and pressure but the selectivity to norbomene decreases due to the formation of DMON. Therefore, the optimal reaction conditions must be selected by considering these features. When a CSTR is used, the appropriate reaction conditions are found to be around 320°C and 1200 psig with 4 1 mole ratio of ethylene to DCPD in the feed stream. Also, it is desirable to have a Pe larger than 50 for a dispersed PFR and keep the residence time low for a PFR with recycle stream. [Pg.712]

The critical parameters associated with the DTA Method have been determined to be ... [Pg.363]

Mossbauer spectroscopy is particularly suitable to study ST since (1) the spectral parameters associated with the HS and LS states of iron(II) clearly differ and (2) the time-scale of the technique ( 10 s) allows the detection of the separate spin states in the course of the transition. Typically, Mossbauer spectra of HS iron(II) show relatively high quadrupole splitting (AEq 2-3 mm s ) and isomer shift (3 1 mm s ), while for LS iron(II), these parameters are generally smaller (AEq < 1 mm s 3 < 0.5 mm s ). Among the early applications of Mossbauer spectroscopy to study ST phenomena in iron(II) complexes is the work of Dezsi et al. [7] on [Fe (phen)2(NCS)2] (phen = 1,10-phenanthroline) as a function of temperature (Fig. 8.2). The transition from the HS ( 12) state (quadrupole doublet of outer two lines with AEq 3 mm s ) to the LS CAi) state (quadrupole... [Pg.394]

Traditionally, analytical chemists and physicists have treated uncertainties of measurements in slightly different ways. Whereas chemists have oriented towards classical error theory and used their statistics (Kaiser [ 1936] Kaiser and Specker [1956]), physicists commonly use empirical uncertainties (from knowledge and experience) which are consequently added according to the law of error propagation. Both ways are combined in the modern uncertainty concept. Uncertainty of measurement is defined as Parameter, associated with the result of a measurement that characterizes the dispersion of the values that could reasonably be attributed to the measurand (ISO 3534-1 [1993] EURACHEM [1995]). [Pg.101]

Parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand . The uncertainty should combine both statistical and non-statistical contributions to the variation of the measured values which may occur in all steps of the analytical process. [Pg.328]

Parameters Associated with the Two Elementary Quantum Oscillators Forming an Hydrogen Bond... [Pg.248]

Measurement uncertainty A parameter, associated with the result of a measurement that characterizes the dispersion of the values that could reasonably be... [Pg.278]

In most blast studies, the negative phase of the blast wave does not affect damage and is ignored, and only blast parameters associated with the positive phase are considered or reported. [Pg.5]

Stirred tank performance often is nearly ideal CSTR or the model may need to take into account bypassing, stagnant zones or other parameters associated with the geometry and operation of the vessel and the agitator. Sometimes the vessel can be visualized as a zone of complete mixing in the vicinity of the impellers followed by a plug flow zone elsewhere, thus a CSTR followed by a PFR. [Pg.504]

The process control of the post-exposure bake that is required for chemically amplified resist systems deserves special attention. Several considerations are apparent from the previous fundamental discussion. In addition for the need to understand the chemical reactions and kinetics of each step, it is important to account for the diffusion of the acid. Not only is the reaction rate of the acid-induced deprotection controlled by temperature but so is the diffusion distance and rate of diffusion of acid. An understanding of the chemistry and chemical kinetics leads one to predict that several process parameters associated with the PEB will need to be optimized if these materials are to be used in a submicron lithographic process. Specific important process parameters include ... [Pg.51]

There is a problem with this approach, however - a problem with the residuals. The residuals are neither parameters of the model nor parameters associated with the uncertainty. They are quantities related to a parameter that expresses the variance of the residuals, The problem, then, is that the simultaneous equations approach in Equation 5.25 would attempt to uniquely calculate three items (P, r, and r,2) using only two experiments, clearly an impossible task. What is needed is an additional constraint to reduce the number of items that need to be estimated. A unique solution will then exist. [Pg.77]

The statistical test for the effectiveness of the factors asks the question, Has a significant amount of variance in the data set been accounted for by the factors as they appear in the model Another way of asking this is to question whether or not one or more of the parameters associated with the factor effects is significant. For models containing a Pq term, the null hypothesis to be tested is... [Pg.165]

Next, when instrumentation is implemented in an industrial environment there are many other parameters associated with the final instrument packaging and the electrical and fire hazard safety that need to be addressed. Often these issues are not trivial and can have a profound impact on both the design and final performance of an instrument. In the following sections instrumentation and component technology will be reviewed, and where appropriate the impact of operation in an industrial environment will be addressed. [Pg.166]

The response function and the associated analytical merits for absorption spectroscopic techniques (e.g., NIR, UV-vis and infrared) are determined by the optical path length, detector gain, signal averaging and spectral resolution. The LIF detection performance is also governed by these parameters but is also influenced by critical parameters associated with the excitation source (e.g., optical power, pulse rate, etc.) as previously discussed. ... [Pg.345]

A protocoF for assessing the behavior of enzymes having one or more isomerization steps. The method facilitates determination of Kup, a kinetic parameter associated with the enzyme interconversion. See Iso... [Pg.124]


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