972 resultados para OH^-


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"16 September 1983."

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"17 December 1976."

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"1 September 1978."

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"8 August 1983."

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"18 July 1977."

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A common assumption is that language is used for conveying factual information, but linguistic forms also serve a way to communicate pragmatic features, such as speakers’ intentions and mental state. This study describes and analyses two strategies for stance-taking in GhaPE, more specific the use of discourse particles and complement-taking predicates. Such grammatical resources have been identified in the literature to play important functions in signalling how the speaker evaluates and positions him/herself and the addressee with respect to objects of discourse. The analysis and discussion of forms is informed by Du Bois’ (2007) ‘stance triangle’, which has proved to be a useful analytical device for investigating stance from a dialogical perspective. GhaPE is at times anticipated as fairly simple both by scholars and in the community where it is spoken. This thesis is thus an attempt to display aspects of the richness of the language.

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Near-resonant holographic interferometry is demonstrated to measure temperature and species concentration in a two-dimensional steady premixed air-acetylene flame. A peak temperature of (2600 +/- 100) K and a peak OH number density of (9.6 +/- 0.3) X 10(22) m(-3) are obtained, consistent with the expected values for such a flame. These values are determined by recording interferograms with a laser assumed sufficiently detuned from line center so that pressure and temperature broadening can be ignored. The results are thus obtained without making prior assumptions on the temperature or pressure of the flame beyond the existence of thermal equilibrium. (C) 2004 Optical Society of America.

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The reaction of [Re6Q8(OH)6]4- (Q = S, Se) with p-tertbutylpyridine (TBP) in water leads to neutral trans-[Re6Q8(TBP)4(OH)2] whose hydroxyl reactivity with carboxylic acid and TBP exchange reaction with functional pyridine have been investigated.

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The use of calcium hydroxide for scavenging zincate species is demonstrated to be a highly effective approach for increasing the electrolyte capacity and improving the performance of the zinc-air fuel cell system. A fundamental approach is established in this study to quantify the formation of calcium zincate as the product of scavenging and the amount of water compensation necessary for optimal performance. The good agreement between predicted and experimental results proves the validity of the proposed theoretical approach. By applying the results of theoretical predictions, both the electrolyte capacity and the cell longevity have been increased by more than 40%. It is also found that, using Ca(OH)2 to scavenge zincate species in concentrated KOH solutions, affects mostly the removal of zincate, rather than ZnO, from the electrolyte, whereas the presence of excess, free, mobile H2O plays a key role in dissolving ZnO and forming zincate. The results obtained in this study demonstrate that the proposed approach can widely and effectively be applied to all zinc-air cell systems during their discharge cycle.