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Background
Recently several studies have shown that people use contextual information to make predictions about the rest of the sentence or story as the text unfolds. Using event related potentials (ERPs) we tested whether these on-line predictions are based on a message-level representation of the discourse or on simple automatic activation by individual words. Subjects heard short stories that were highly constraining for one specific noun, or stories that were not specifically predictive but contained the same prime words as the predictive stories. To test whether listeners make specific predictions critical nouns were preceded by an adjective that was inflected according to, or in contrast with, the gender of the expected noun. 相似文献48.
V. B. Murachev V. S. Byrikhin A. I. Nesmelov E. A. Ezhova E. F. Shashkina V. I. Aksenov 《Russian Chemical Bulletin》1999,48(4):707-710
The ternary catalytic system AlBui
3-TiCl4-CCl4 initiates the cationic polymerization of isobutylene in toluene at room temperature, whereas the binary combinations of these
components do not induce isobutylene polymerization. At low CCl4 concentrations, the polymerization rates decrease sharply with time, and the quantitative yield of the polymer is achieved
at an excess of CCl4 with respect to the titanium and aluminum components. The molecular weights of the polymers range within 1300–4000, and the
index of polydispersity, as a rule, does not exceed 2.7. The influence of the conditions of component mixing (order of addition,
duration of exposure prior to addition of the third component) on the yield and molecular weight of the polymerization product
was found.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 711–714, April, 1999. 相似文献
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Microwave heating of ceramic composites 总被引:1,自引:0,他引:1
The microwave heating of a ceramic composite is modelled andanalysed. The composite consists of many small ceramic particlesembedded in a ceramic cement. The composite is assumed to bewell insulated, and each particle is assumed to be in imperfectthermal contact with the surrounding cement. Based on thesetwo assumptions an asymptotic theory exploiting the small Biotnumber and small non-dimensional contact conductance is developed.Our asymptotic theory yields a set of nonlinear partial differentialequations which govern the temperature in the composite. Theseare reduced to a set of coupled nonlinear ordinary differentialequations in which the surface area of each particle entersas a parameter. Recent experiments with such composites haveshown that the steady-state temperature of the composite isstrongly dependent upon the radii of the embedded particles.Our model captures this effect. In fact, our analysis showsthat the assumption of imperfect thermal contact between theparticles and the ceramic cement is essential for this trendto be established. 相似文献
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