865 resultados para reflection holograms
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No abstract.
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As the UK’s brutal political fallout of Brexit continues to astound the world, leaders in the other member states are wrestling with the EU’s new reality. They deemed it too early to draw conclusions at the June European Council. Instead, the heads of state and government declared a period of political reflection on the future of an EU with 27 member states. They will meet again informally on September 16th in Bratislava. The question is: What impetus can they give to reforms to remain united and deal with the challenges of the 21st century?
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Seventy-one samples from Ocean Drilling Program Leg 180 sites were analyzed for vitrinite reflectance and organic type. The objective was to define maximum paleotemperatures across the western Woodlark Basin as a function of depth. The organic matter is of early Pliocene to Holocene age and was recovered from drilled depths of 4.5 to 851.3 meters below seafloor. Organic matter is generally restricted to woody fragments within the sediment, although in a number of fine-grained samples, organic matter is dispersed throughout the sample. Virtually all samples contain vitrinite, part of which may be derived from drifted logs. One sample was found to be barren of organic matter, and two contain only fusinite and semifusinite. Variation of vitrinite reflectance is not systematic with either depth or location, and it appears that formation temperatures have been insufficient to cause an increase in vitrinite reflectance levels. Textural variations within the vitrinite show better correlation with depth. Samples of hypautochthonous peats represent either a terrestrial phase of sedimentation or large peat intraclasts within the section, possibly produced by forest fires in the source areas of the organic matter. The vitrinite and peat-derived samples appear to come from eucalyptus forest settings away from the coastline. Liptinite is not abundant in most of the samples (excluding suberinite associated with woody tissues). Marine liptinite is rare to absent, although many of the samples contain abundant foraminiferal tests. Pyrite is abundant in many of the wood fragments, and some pyritization of woody tissues has taken place.
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"November 1980."
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"March 1976."
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"December 1982."
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Bibliography: p. 42.
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"October 1969."
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"June 1980."
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"August 1988."