Additional Experiments

For further evaluation of the photothermal model for the ablation of PI, additional measurements were performed with different irradiation wavelengths (248 and 351 nm). The data are shown in Fig. 77. Both irradiations [Pg.194]

These additional data show clearly that even the most advanced photo-thermal model that was developed over several years and that could explain all the data up to now is still not complete, or that additional experiments are necessary to explain the new data. [Pg.195]

The broad peak, attributed again to ground state neutrals, could not be simply described by a simple Maxwell-Boltzmann distribution of particles emitted during the laser pulse. The leading edge of the particle distribution was far too fast to be consistent with any Maxwell-Boltzmann distribution that could account for the very long tail in the detected emissions. Thus emission appears to continue for some time after the laser pulse. Although [Pg.196]

A number of gravimetric methods, such as the determination of Ct in a soluble salt, have been part of the standard repertoire of experiments for introductory courses in analytical chemistry. Listed here are additional experiments that may be used to provide practical examples of gravimetry. [Pg.266]

The following experiments may he used to illustrate the application of titrimetry to quantitative, qtmlitative, or characterization problems. Experiments are grouped into four categories based on the type of reaction (acid-base, complexation, redox, and precipitation). A brief description is included with each experiment providing details such as the type of sample analyzed, the method for locating end points, or the analysis of data. Additional experiments emphasizing potentiometric electrodes are found in Chapter 11. [Pg.358]

Kelkar and McCarthy (1995) proposed another method to use the feedforward experiments to develop a kinetic model in a CSTR. An initial experimental design is augmented in a stepwise manner with additional experiments until a satisfactory model is developed. For augmenting data, experiments are selected in a way to increase the determinant of the correlation matrix. The method is demonstrated on kinetic model development for the aldol condensation of acetone over a mixed oxide catalyst. [Pg.143]

Additional experiments should be performed on a large scale to establish the emissive power of fireballs generated by BLEVEs. The effects of flammable substances involved, fireball diameter, and initial pressure should be investigated. [Pg.239]

During studies on ditryptophan derivatives, an interesting acid-induced cy-cHzation has been discovered. The 10-membered ring 37 was thus subjected to acidic conditions to produce the indolocarbazole derivative 38 (Scheme 6). Interestingly, calculations performed on the precursor 37 indicated that the lowest energy conformation resembled that of the diastereomer of 38, which was never observed. An additional experiment furnished the parent system 1 on treatment of 38 with a catalytic amount of acid. A TFA-induced formation of an indolo[2,3-<3]carbazole was also observed from a related acyclic 2,2 -connected tryptophan dimer (99JOC8537). [Pg.9]

Effects were similar with the two polypropylenes as matrix. Nevertheless, as in our earlier studies f44], the in situ fibrillation was more pronounced for the more viscous PP (VB1950K) and this PP grade was selected for the additional experiments. [Pg.626]

As additional experiments, investigate the decomposition of calcium oxalate in a static air atmosphere and in a nitrogen atmosphere at a flow rate of 10 mL min -. Compare the final stage of the decomposition, i.e. the conversion of calcium carbonate to calcium oxide, using different furnace atmospheres. [Pg.498]

BS 2486 was first published in 1954, revised in 1978, and revised again in 1997. The 1978 revision contained two primary tables setting out water chemistry guidelines these were both quite broad in nature and covered FT (shell) boilers and WT boilers. This revision has now been withdrawn by BSI and replaced by the 1997 revision. The latest revision brings the technical content up to date, reflecting considerable additional experience gained in boiler design and operation by the subcommittee and 14 other bodies that provided contributions. [Pg.562]

The purpose of this report is to bring the author s model and theory for carbon black reinforcement of rubbers to a conclusion, with additional experiments and discussion. This research consists of three papers (Part 1, Part 2, and Part 3), where the reinforcement of elastomers is generalized with the universal and common concept. Now, preceding the detailed discussion, we would like to discuss the previous concept generally accepted for carbon black reinforcement of rubbers and the author s new model and theory. [Pg.519]

Experimental observations are at the heart of chemical research. Many experiments are designed specifically to answer some particular chemical question. Often, the results of these experiments are unexpected and lead to new hypotheses. New hypotheses, in turn, suggest additional experiments. The Chemistry and Life Box describes how the hypothesis of extraterrestrial life can be tested. [Pg.7]

Additional experiments were carried out to examine the formation of toluene from n-heptane When the heptane was labeled with in the 1-position, half the radioactivity was in the methyl group and the other half was in the aromatic ring of the toluene. This clearly indicates that ring formation involves 1,6 or 2,7 closure and excludes the possibility of any interconversion between five membered and six membered rings. Perhaps this is not surprising since the catalyst s acid sites are neutralized by the sodium. [Pg.91]

In order to obtain a better understanding of the processes that regulate tissue disintegration, additional experiments will include the heterologous expression in potato tubers of a secreted PL3 isoform. [Pg.395]

In summary, the results from the fixed bed reactor study provided evidence as to the effect of Au and KOAc on the performance of the catalyst, though, these experiments did not give any information on the perturbation of the reaction pathways with the addition of Au and KOAc. For this type of information, additional experiments were performed using the TAP reactor with 1,2 C-labeled ethylene used as an isotopic tracer of the kinetics. [Pg.192]

It was also reported that microcrystallites of layered semiconductor Pblj were prepared in colloidal form. The spectrum of such a colloidal solution consisted of three absorption bands in the UV which were considerably bu hifted from the absorption threshold of macrocrystalline Pblj. These results were explained by carrier confinement in three differently sized crystallites, each a single layer ( 7 A) thick. However, complexes of Pbl2 with iodide have similar absorption bands, and it seems at the present time that additional experiments have to be carried out to ascertain the colloidal nature of the absorbing species. Size quantization was also reported for colloids of red Hgl2 in acetonitrile... [Pg.165]

Additional experiments were carried out to study the behavior of Pd nanoparticles coated with Pt or with Pt plus M, which more closely reflects the morphology of actual catalyst particles. Figure 9.18a displays the polarization curves for the ORR on commercial carbon-supported Pt nanoparticles (Pt/C), Pd nanoparticles (Pd/C), a monolayer of Pt on Pd/C (PtMu/Pd/C), and mixed (Pto.gIro.a/ML/Pd/C and... [Pg.293]

The method for chloroacetanilide soil metabolites in water determines concentrations of ethanesulfonic acid (ESA) and oxanilic acid (OXA) metabolites of alachlor, acetochlor, and metolachlor in surface water and groundwater samples by direct aqueous injection LC/MS/MS. After injection, compounds are separated by reversed-phase HPLC and introduced into the mass spectrometer with a TurboIonSpray atmospheric pressure ionization (API) interface. Using direct aqueous injection without prior SPE and/or concentration minimizes losses and greatly simplifies the analytical procedure. Standard addition experiments can be used to check for matrix effects. With multiple-reaction monitoring in the negative electrospray ionization mode, LC/MS/MS provides superior specificity and sensitivity compared with conventional liquid chromatography/mass spectrometry (LC/MS) or liquid chromatography/ultraviolet detection (LC/UV), and the need for a confirmatory method is eliminated. In summary,... [Pg.349]

Standard addition experiments can be used to check for matrix effects such as ion enhancement or suppression. [Pg.385]

Step 7. If the obtained accuracy is satisfactory, stop else go back to Step 2 and select the conditions for an additional experiment. [Pg.190]

These latter have been tabulated for a great many pairs (M M ) of particular monomers [35]. This circumstance offers in many cases an opportunity to carry out the calculation of statistical characteristics of the products of multicomponent copolymerization without the need for additional experiments to determine the kinetic parameters of the model. [Pg.177]

Metaphit, (l-(l-(3-isothiocyanatophenyl)cyclohexyl)p1peri di ne), is a PCP analog that specifically acylates PCP receptors in vitro (Rafferty et al. 1985). Additional experiments were performed to determine whether metaphit could acylate PCP receptors in vi vo and... [Pg.97]

Yaodong Huang, while pursuing the synthesis of ( + )-berkelic acid (69), reported a diastereoselective cycloaddition using method H that leads to another type of 5,6-aryloxy spiroketals (Fig. 4.36).32 For example, addition of three equivalents of t-butyl magnesium bromide to alcohol 70 in the presence of the exocyclic enol ether 71 proceeds in a 72% yield to the spiroketal 72 with a 4.5 1 selectivity favoring the endo approach (Fig. 4.36). Additional experiments suggest the bromine atom decreases the HOMO-LUMO band gap and improves diastereoselectivity. [Pg.108]

Big Chemical Encyclopedia

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