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- Feilitzen, Cecilia von
(author)
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Electronic Games, Pornography, Perceptions
- 2000
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In: Children in the new media landscape. - Göteborg : The UNESCO International Clearinghouse on Children and Violence on the Screen, NORDICOM, Göteborg University. - 9189471016 ; , s. 13-23
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Book chapter (other academic/artistic)
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- de Vries, Bernard L., et al.
(author)
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Laboratory mid-IR spectra of equilibrated and igneous meteorites. Searching for observables of planetesimal debris
- 2018
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In: Icarus. - : Elsevier BV. - 0019-1035 .- 1090-2643. ; 307, s. 400-416
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Journal article (peer-reviewed)abstract
- Meteorites contain minerals from Solar System asteroids with different properties (like size, presence of water, core formation). We provide new mid-IR transmission spectra of powdered meteorites to obtain templates of how mid-IR spectra of asteroidal debris would look like. This is essential for interpreting mid-IR spectra of past and future space observatories, like the James Webb Space Telescope. First we present new transmission spectra of powdered ordinary chondrite, pallasite and HED meteorites and then we combine them with already available transmission spectra of chondrites in the literature, giving a total set of 64 transmission spectra. In detail we study the spectral features of minerals in these spectra to obtain measurables used to spectroscopically distinguish between meteorite groups. Being able to differentiate between dust from different meteorite types means we can probe properties of parent bodies, like their size, if they were wet or dry and if they are differentiated (core formation) or not. We show that the transmission spectra of wet and dry chondrites, carbonaceous and ordinary chondrites and achondrite and chondrite meteorites are distinctly different in a way one can distinguish in astronomical mid-IR spectra. Carbonaceous chondrites type <3 (aqueously altered) show distinct features of hydrated silicates (hydrosilicates) compared to the olivine and pyroxene rich ordinary chondrites (dry and equilibrated meteorites). Also the iron concentration of the olivine in carbonaceous chondrites differs from ordinary chondrites, which can be probed by the wavelength peak position of the olivine spectral features. The transmission spectra of chondrites (not differentiated) are also strongly different from the achondrite HED meteorites (meteorites from differentiated bodies like 4 Vesta), where the latter show much stronger pyroxene signatures. The two observables that spectroscopically separate the different meteorites groups (and thus the different types of parent bodies) are the pyroxene-olivine feature strength ratio and the peak shift of the olivine spectral features due to an increase in the iron concentration of the olivine.
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- Hanberg, A
(author)
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Toxicology of environmentally persistent chlorinated organic compounds
- 1996
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In: PURE AND APPLIED CHEMISTRY. - : Walter de Gruyter GmbH. - 0033-4545 .- 1365-3075. ; 68:9, s. 1791-1799
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Journal article (other academic/artistic)abstract
- The chlorinated organic compounds comprise a large group of compounds with a complex diversity of biologic effects and mechanisms of action. Based on the persistence and high toxicity of dioxins, PCBs, and DDT, this chapter focuses primarily on the toxicology of these organochlorine compounds. Not even these groups of compounds can be regarded as homogenous since the individual congeners show diverse environmental fates and toxicities. In this chapter, we will consider primarily the critical effects suspected to occur at human exposure at background levels, i.e. cancer, and effects on reproduction, neurobehaviour and the immune system. In recent years, interactions between these compounds and hormonal systems have received increasing attention. They have also been shown to be particularly toxic to the developing embryo, fetus and infant. In order to conduct accurate risk assessment, there is a need for further mechanistical data, and additional epidemiological studies, especially with regard to effects on reproductive, neurobehavioural and immune systems. The data presently available suggest that such effects already occur in the human population and thus, in order to reduce the exposure to these compounds, further release into the environment should be prevented.
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| 7. |
- Benthorn, Lars, et al.
(author)
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Fire alarm in a public building : how do people evaluate information and choose evacuation exit?
- 1999
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In: Fire and Materials. - 1099-1018. ; 23:6, s. 311-315
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Journal article (peer-reviewed)abstract
- How people react to a fire alarm has been studied in retrospect as well as in experiments. In the present study, the choice of exit was examined with respect to the distance to exits and open or closed emergency exit. The second part deals with some communication aspects regarding identification of signs. It is shown that the subjects prefer a familiar ordinary cash exit even if the distance to that exit is longer than to the nearest emergency exit. However, if the emergency exit is open and the subjects can see the outside, an emergency exit becomes more attractive and most of the subjects choose the emergency exit. The understanding of signs important in a fire evacuation situation is very good. Copyright © 1999 John Wiley & Sons, Ltd.
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