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H Kock

Publications and source records attributed to H Kock.

7 recordsLinked to original sources
PubMed1992

Effect of photocorrosion on cadmium sulfide suspensions applied in animal inhalation studies with CdS particles.

Cadmium sulfide aerosol (90 micrograms Cd/m3) was generated from an aqueous suspension for 12 weeks and the ratio of Cd++/Cdtotal in the suspension and the resulting aerosol was determined. After 4 weeks the concentration of Cd++ in the suspension and the aerosol leveled off at 43.5 +/- 11.4% and 35.8 +/- 6.8%, respectively. Therefore, lung tumors in rats observed after inhalation exposure to such CdS aerosols (Glaser et al. 1990) may have been caused not only by the effect of CdS but also by the influence of inhaled Cd++ or CdSO4. The contribution of CdS particles to the observed lung tumor rate depends on the bioavailability of CdS retained in the lungs. The photochemical decay of CdS in aqueous suspensions only occurred when exposed to light and adjusting the suspension up to pH 3 did not increase the decomposition rate of CdS. Ethanolic suspensions of CdS are much more stable than aqueous ones and experiments with suspensions kept under shield gases showed that the decay of CdS is not dependent on oxygen.

Administration, Inhalation↗
PubMed1989

To link, to infer, to understand.

A model of linkage in text processing is proposed: An external proposition and an inference belonging to one frame are superimposed to constitute understanding. A text containing four academic subjects was presented orally to students who recalled it in writing. After transforming the recalls into propositions they are entered into a nonmetric multidimensional scaling to yield a text space. The subjects' interest choices among items of the four aspects are scaled to render an interest space. The decomposition ob both as subspaces of a common space yields an angle as their overall similarity and indicates the degree of predictability from interests. As the aggregate of inferences shows directedness, correlated with volitional-motivational orientation, and inference base is assumed to intervene. It is concluded that recipients try to superimpose and thereby construct a primary stage of processing. This allows for a very general algorithm of parallel information processing (holographic thesis), perhaps constructing the properties we are used to. Motivated perception, knowledge influence, schema-directedness and contribution to coherence are rivalled out as an explanation of this process.

Adult↗