Hints measuring performance

Further measurements performed by Vajo et al. [36], Barkhordarian et al. [95], and Bosenberg et al. [96] confirmed that much lower pressures and temperatures are sufficient for hydrogenation of these compounds. So far, all measurements hint at a one-step absorption process (7.22), while desorption in the case of 2UBH4 + MgH2 for instance, appears to be at least a two-step process under the normally applied conditions (7.23), see Figure 7.15. 

SAQ8.19 To return to the example of the Turin Shroud. Suppose a sloppy technique caused the precision of the 14C measurement to decrease from 92.23 per cent to 90 2 percent. Calculate the range of ages for the shroud. [Hint perform two calculations, one for either of the extreme values of percentage.]... 

Superficially, eqs. (3.1.11-12) seem to imply that diagonalization could be achieved in n(n - l)/2 steps. However, every time a rotation is used to set a specific At to zero, previously zeroed elements in the same row and column will be destroyed. This observation also hints at the proper selection of which element to eliminate in each step It is wasteful to spend operations on a rotation to eliminate a very small element which will anyway later get destroyed, so we should eliminate one of the largest elements. The best choice is usually the largest element however, for any but the smallest matrices, it takes more time to search for the largest element than to perform the rotation. Common practice is to simply loop over all elements in a predetermined order, but to slap the rotation for elements which fall below a certain threshold. This threshold is then successively lowered before each such sweep. Its value is based on the non-diagonality measure (3.1.6) (due to . Neumann) or some other convenient measure. 

The simulations nested in the coarse grid METRAS results agree in a similar way with the reference simulation in the second half of the simulation time (after about 21 h i.e. 18 CET of 29 August 2003). At this time the performance of simulation 5 is somewhat closer to the other nested simulations than before. This might be a hint that the nesting becomes less relevant and the situation is more locally driven. In the first 21 h of the simulation the two simulations with constant update intervals (3 h, 6 h) are closest to the reference case, while the adaptive update simulations (3, 4) show a high variability in performance. This is a hint that the acceleration is probably not a reliable measure to determine update intervals. The best performance is received in the present case study for a nesting every 3 h. 

A 0.5 wt. % Pt on silica catalyst gave the data listed below for the sorption of H2. Upon completion of Run 1, the system was evacuated and then Run 2 was performed. Find the dispersion and average particle size of the Pt particles. Hint. Run 1 measures the total sorption of hydrogen (reversible + irreversible) while Run 2 gives only the reversible hydrogen uptake. Calculate the dispersion based on the chemisorbed (irreversible) hydrogen. 

This reaction occurs in a packed catalytic tubular reactor and data have been obtained near the inlet to characterize the total pressure dependence of the initial rate, when a stoichiometric feed (i.e., 1 2) of reactants A2 and B is present. At constant temperature T, experiments were performed such that all total pressures ptotai exist in a narrow range near the critical point of this ternary mixture. Hence, forward exhibits a significant dependence on total pressure. Employ a linear least-squares procedure and analyze the experimental data (i.e., 381hw, initial vs. ptotai) which have been measured. Hint Identify the dependent (y) and independent (x) variables, and the slope (aO and intercept (ao) for the following polynomial model y = ao+ Uix. 

With LA, MC-ICP-MS isotope ratio measurements can be performed in just a few minutes per sample as compared with the several hours per sample required for TIMS analysis. In addition, LA-MC-ICP-MS can yield spatially resolved isotope ratio characterization. Thus, provenance studies of ceramic paints, glazes, and slips in situ by LA-MC-ICP-MS measurement of lead and/or other isotope ratios are obvious areas for future development. Hints of the potential of this approach are highlighted in a recent study by Huntley [74], which showed that interaction on different spatial scales can be detected via elemental analysis of paste together with lead isotope analysis of glaze paints on Zuni glazed wares. 

Measuring just the impedance in the wound would lead to several interferences caused by e.g. the temperature and the pH value. However, a change of these parameters also gives a hint for an ongoing infection in the wound. Combining this information would lead to a sufficient specificity of a wound sensor. Miniaturized sensor concepts already exist for all mentioned parameters. Characterization of wounds in their environment is performed for example for pH value and temperature whereas because of the hmited availability of reliable wound models the development for impedance is still in progress. Our wound model environment includes cellular constituents of the wound fluid which can be measured with commercial 2-electrode setups (Roche) for cultivated cells. By using a self-made adapter we connect these electrode wells with an impedance analyzer (ScioSpec ISX-3). 

Performance Obtain three metal samples from your teacher. Determine the mass and volume of each sample. Calculate the density of each metal fi om your measurement data. (Hint Consider using the water displacement technique to measure the volume of your samples.)... 

Early calorimetric investigations were performed on pupae of the wax moth Galleria mellonella by means of a differential adiabatic setup [92]. Galleria represents an important pest for weak honeybee colonies where it feeds on wax, honey, pollen and other organic material. Individual pupae were kept in small Dewar flasks of 5 cm for measurements of 10 to 60 min, which were repeated in regular intervals through the whole pupal metamorphosis of about 7 days. The calorimetric experiments alternated with manometry (indirect calorimetry) to evaluate the RQ and to find hints about the type of metabolism. Heat dissipation was monitored by electrical heating of the reference flask to keep the temperature difference between both Dewars close to zero. In this way composite curves for male and female moths and both direct and indirect calorimetry were established. 

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