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排序方式： 共有390条查询结果，搜索用时 46 毫秒
81.
MIKE WALKER Martin J. Head John Lowe Max Berkelhammer Svante Bj
rck Hai Cheng Les C. Cwynar David Fisher Vasileios Gkinis Antony Long Rewi Newnham Sune Olander Rasmussen Harvey Weiss 《第四纪科学杂志》2019,34(3):173-186
The Holocene, which currently spans ~11 700 years, is the shortest series/epoch within the geological time scale (GTS), yet it contains a rich archive of evidence in stratigraphical contexts that are frequently continuous and often preserved at high levels of resolution. On 14 June 2018, the Executive Committee of the International Union of Geological Sciences formally ratified a proposal to subdivide the Holocene into three stages/ages, along with their equivalent subseries/subepochs, each anchored by a Global boundary Stratotype Section and Point (GSSP). The new stages are the Greenlandian (Lower/Early Holocene Subseries/Subepoch) with its GSSP in the Greenland NGRIP2 ice core and dated at 11 700 a b2k (before 2000 CE); the Northgrippian (Middle Holocene Subseries/Subepoch) with its GSSP in the Greenland NGRIP1 ice core and dated at 8236 a b2k; and the Meghalayan (Upper/Late Holocene Subseries/Subepoch) with its GSSP in a speleothem from Mawmluh Cave, north‐eastern India, with a date of 4250 a b2k. We explain the nomenclature of the new divisions, describe the procedures involved in the ratification process, designate auxiliary stratotypes to support the GSSPs and consider the implications of the subdivision for defining the Anthropocene as a new unit within the GTS. 相似文献
82.
K. D. Rakos W. W. Weiss S. Müller R. Pressberger P. Wachtler J. M. Schombert T. J. Kreidl 《Astrophysics and Space Science》1990,171(1-2):305-306
The spectrophotometer presented here combines the advantage of aperture photometry with spectrophotometry to obtain colours of extended objects over the range of 3500–6000 Å. The spectrophotometric resolution matches the resolution of intermediate-band interference filters of about 140 Å FWHM.Paper presented at the 11th European Regional Astronomical Meetings of the IAU on New Windows to the Universe, held 3–8 July, 1989, Tenerife, Canary Islands, Spain. 相似文献
83.
Wenfeng Wang Yong Qin Shuxun Sang Yanming Zhu Chaoyong Wang Dominik J. Weiss 《International Journal of Coal Geology》2008,76(4):309-317
Twenty-six samples including roof, bottom and coal plies of a marine influenced coal bed were collected from the Antaibao mining district, Shanxi, China. The rare earth elements (REEs) were determined in solids and organic solvent extracts. The distribution pattern showed three distinct patterns: shale-like, LREE-rich and HREE-rich. This is attributed to the variable microenvironment of peat-forming swamp, the degree of marine influences and different REE sources. REEs in the coal are mainly controlled by detrital minerals but also affected by seawater. The chondrite-normalized REE patterns of the organic solvent extracts are distinctly different from those of corresponding original coal samples, which show a negative Eu anomaly, a depletion of middle REEs and an enrichment of HREEs. The LREEs in coal extracts are likely adsorbed by hydrogen-containing functional groups, and HREEs are likely bonded to carbon atoms. 相似文献
84.
A. Weiss 《Theoretical and Applied Climatology》1990,41(1-2):87-92
Summary A distinction is made between climate information and climate-related information. The former pertains to any expression of climate data used for decision making. Climaterelated information for pest management results from quantifying relationships between host, environment, and pest and presenting the consequences of different actions, a decisionmaking format. It is suggested that in order to develop climate-related information for pest management, automated weather stations in climatological networks should be expanded from these site specific locations to crop specific locations. Combining physical and biological data can be the basis for developing or improving crop/pest interaction models and can also serve as a database for verifying existing models. These models can be run under different economic and climatic scenarios with different risk preferences to present end users with results from different pest management options.With 2 Figures 相似文献
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The uptake of a suite of 19 metals from coastal seawaters upon both glass and Teflon surfaces reflected primarily the sorption of particulate matter derived from crustal rock weathering. Uptake for all elements was greater in the light than in the dark. Based upon these and earlier results, a new definition of scavenging for environmental systems is proposed. 相似文献
88.
89.
N. O. Weiss 《地球物理与天体物理流体动力学》2013,107(4):344-345
Abstract Edited by D. L. Book. Springer-Verlag, New York, 1981. 226 pp., DM 72,—, $33.60. (ISBN 0 387 104828) 相似文献
90.