Thermal emission times, table

The properties of the lowest triplet state of Pt(4,6-dFppy)(acac) in n-octane are nearly independent of the site chosen. An investigation of two other discrete sites reveals ZFS values which do not deviate significantly from the values observed for the main site. Furthermore, even different host materials do not lead to remarkable changes. Corresponding data are summarized in Table 1. For CH2C12 the splitting could be measured directly by site-selective spectroscopy of one discrete site, while for THF only a broadband spectrum was obtained. In this case, the ZFS was obtained from the temperature dependence of the thermalized emission decay time by a fit of (3) as described in Sect 3.2. 

S02 is a very stable oxide and its thermal decomposition is only measurable at the very high temperatures attained in a shock tube. A study357 of the time-dependence of light emission from shock-heated S02/Ar mixtures in the region of 3000 °K has shown that S02 is removed in accordance with a sigmoid-shaped concentration-time curve typical of a chain or autoaccelerated reaction. The induction period observed357 prior to the onset of detectable decomposition corresponded closely with the time for the formation of a fixed concentration of O (or SO) calculated from the rate expression (Table 24) for the unimolecular decomposition... 

The technique of microwave-recovery provides crucial information about the substates involved in the ODMR transitions. For this experiment, Pd(2-thpy)2 is optically excited by a c. w. source. This leads to specific populations of the three triplet substates. At low temperature, they are thermally decoupled and thus emit according to their specific populations and their individual decay constants (e. g. see Sect. 3.1.3 and Table 2). In the microwave recovery experiment, the steady state conditions are perturbed by a microwave pulse being in resonance with the zero-field transition at 2886 MHz. Due to the microwave pulse, the populations of the two states involved are changed. Subsequently, one monitors the recovery of the emission intensity in time until the steady state situation is reached again. The microwave pulses have, for example, a duration of 20 ps and are applied repeatedly to enable a detection with signal averaging [61]. 

The CL of thermally degraded PECT samples was undertaken under oxygen at 150°C, to evaluate the effectiveness of antioxidants incorporated into the copolymer (Fig. 3.12). The maximum of the initial intensity of CL emission (/maxi) and the oxidation induction time (OIT) were determined (Table 3.11). 

The emission spectrum of Nal(Tl) peaks at 410 nm, and the light-conversion efficiency is the highest of all the inorganic scintillators (Table 6.1). As a material, Nal(Tl) has many undesirable properties. It is brittle and sensitive to temperature gradients and thermal shocks. It is also so hygroscopic that it should be kept encapsulated at all times. Nal always contains a small amount of potassium, which creates a certain background because of the radioactive... 

The term Decf Do (Equation 1) is introduced to account for the asymptotic behavior of dispersion to a non-zero value after a finite time. Higher Da/Do values mean increased thermal stability. The GPLE model fits sintering data for values of lfundamental steps thought to be important in sintering of supported metals, as emission of atoms from crystallites, diffusion of... 

CNTs exhibited unique mechanical, thermal, and field emission properties and electrical conductivity (Min-Feng et al. 2000a, b) (Table 1). It is claimed that CNTs have an elastic modulus that is higher than carbon fibers, and is five times stronger... 

In spark ablation, a spark at constant density is obtained in a matter of seconds, and thus, particularly in the case of small spark chambers, prebum times are accordingly low. In plasma emission as well as in plasma mass spectrometry a linear dynamic range of more than four orders of magnitude can be obtained and RSDs are a few percent in the case of absolute measurements. However, as shown by the results in Table 6, they can easily fall to below 1%, when using an internal standard element (Fe in the case of steel samples). The matrix effects from the sampling source are low, as will be shown in combination with ICP-OES (see Refs. [242, 248]). They are lower than in arc ablation, as here differences stemming from the thermal volatility of the elements and their compounds play a lesser role. The... 

For tigheat transfer mechanism in the channel, enhancing the upstream propagation of the reaction front. A numerical experiment was conducted to quantify the effect of radiation on the apparent thermal conductivity of the solid wall, by recomputing Case 15 and assuming an artificial material (cordierite ) for the microreactor wall, which had essentially the same properties with cordierite in Table 8.1 except for a higher thermal conductivity the value of was increased at 0.5 W/mK steps, until fig and fit assumed values close to the ones of Case 16. For = 5.5 W/mK, ignition and steady-state times for a microreactor without surface radiation, became essentially identical to the characteristic times of a microreactor with — 2.0 W/mK and a surface emissivity of 8 = 0.6 (see Case 17 in Table 8.2). This apparent increase in the thermal conductivity of the solid, however, should not be confused with numerical models employing effective wall thermal conductivity for catalytic monoliths [23]. 

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