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排序方式： 共有137条查询结果，搜索用时 15 毫秒
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Rod M. Douglas 《Quaternary Research》2006,65(1):87-95
It is has been suggested that faunal remains at Florisbad were fossilized in a spring context due to the mineralized spring water. However, the environment conducive to the precipitation of CaCO3 and other authigenic minerals was formed largely through the salinization of the organic layers and clay, and the mineralization of the groundwater. Factors contributing to this favorable environment include: CaCO3 saturation, pH, the decomposition of halophytes, Eh, rainfall, biomineralization, and aeolian deposition. With the exception of pH, none of the above factors feature in a spring context, with evidence suggesting that the spring water may historically never have carried sufficient minerals for fossilization, and that contact with the spring water may actually have resulted in the demineralization of previously fossilized material. In light of this evidence, it is concluded that the fossilization of faunal remains at Florisbad took place in a sedimentary organic matter and clay environment and could not have taken place in the spring vents where there is an undersaturation of Ca. 相似文献
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The effect of scattering in surface wave tomography 总被引：6，自引：1，他引：6
Jesper Spetzler Jeannot Trampert Roel Snieder 《Geophysical Journal International》2002,149(3):755-767
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Amino acid nitrogen in atmospheric aerosols: Occurrence,sources and photochemical modification 总被引：2，自引：0，他引：2
The presence of amino acids in atmospheric precipitation and aerosols has been noted for many years, yet relatively little is known about these or other nitrogen containing organic compounds in the atmosphere. Marine and continental rainwater analyses indicate that atmospheric aerosols, and subsequently atmospheric precipitation, may contain substantial levels of free and combined amino acids. The most likely source of amino N in the remote marine atmosphere appears to be the injection of proteinaceous material through the action of bursting bubbles at the sea-air interface or the long range transport from terrestrial sources. The capacity of these substrates to undergo photooxidation and photodegradation in the atmosphere to simpler species, such as ammonium ions, carboxylic acids, and for the S containing amino acids, oxidized forms of sulfur, has received little attention from atmospheric chemists. The photochemistry of covalently bound amino groups, particularly as found in peptides and amino acids, is discussed here with the purpose of summarizing what is known of their occurrence and their possible importance to atmospheric chemistry. 相似文献
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Rod Gerber 《GeoJournal》1990,20(1):15-23
Geography in Australia has a heritage that is strongly British, but more recently has been influenced from other parts of
the world, such as North America and New Zealand. Its popularity has fluctuated and it is now under threat as a separate subject
in the compulsory years of schooling. In higher education, geography has retrieved lost ground to be a popular area of study,
but not a research area in the current national priorities. Geography plays a focal role in the general education of Australians.
It is a medium for education involving the education of people, about, in, and for the society and environment in which they
live. Through education, geography will enable people to explore their life-roles as learners, social beings, recreators,
producers, consumers and citizens. It will develop in people distinctive knowledge, thinking processes, attitudes and values,
and encourage participation in social and environmental actions. Teachers in secondary and higher education have differing
and distinctive roles. Being a geographer in Australia does have benefits including: working in an identifiable area of knowledge
maintaining a bridge across the physical and social sciences; the promotion of inquiry approaches and as a focus for the various
adjectival educations that have emerged. These are tempered by challenges such as: threats from emerging disciplines, current
national research priorities and the movement to social science education. Therefore, promotion of geography in Australia
needs to be much more forceful than it has until now. The work of groups such as the Institute of Australian Geographers and
the Australian Geography Teachers' Association needs to be co-ordinated more closely to develop a strong lobby for geography
in Australian education. 相似文献
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