276 research outputs found
Uplift rates defined by U-series and 14C ages of serpulid-encrusted speleothems from submerged caves near Siracusa, Sicily (Italy)
No full textWe have established a plausible rate of uplift near Siracusa in southeastern Sicily (Italy) over the last glacial-interglacial cycle using U-series ages of submerged speleothem calcite and 14C ages of calcite serpulid layers that encrust the speleothems during cave submergence. The precisely determined ages of these sea level benchmarks were compared with expected relative sea level position based on glacio-hydro-isostatic modeling to assess the rate of uplift in this region. When combined with the age of various late Holocene archaeological sites that have been recently described and characterized in terms of their functional position relative to sea level these data collectively define a rate of uplift ≤0.4 mm a-1 along this portion of the Sicilian coastline. These results are consistent with an age assignment of marine isotope stage (MIS) 5.3 or 5.5 for the Akradina terrace, which in turn places temporal constraints on paleoshorelines above and below this level. © 2008 Elsevier Ltd. All rights reserved
CORRELATIONS BETWEEN TOTAL PROTEIN AND SPARKLING WINE FOAM PARAMETERS
No full text93 pagesFoam is a crucial factor in the perception of sparkling wine quality. Empirical data suggest that sparkling wines produced from grapes other than Vitis vinifera show greater foam height but this factor has received limited research attention. Marquette, Cayuga, and Chardonnay grapes were used to produce traditional method and still wine products. Still wines were treated with bentonite additions of 0.1 g/L , 0.3 g/L, and 0.5 g/L to create a range of protein concentration. Foam maximum volume, foam 50% collapse time, total protein, and malic acid were measured in all wines. Total protein had no significant impact on any foam parameters when traditional method and force-carbonated base wines were assessed together, but total protein had a significant effect on foam maximum volume in bentonite-treated wines, and foam stability showed a significant interaction between cultivar and total protein. Aspartic acid concentration had a negative correlation with foam volume
Actinides AMS at CIRCE and 236U and Pu measurements of structural and environmental samples from in and around a mothballed nuclear power plant
No full textAccelerator mass spectrometry (AMS) is presently the most sensitive technique for the measurement of
long-lived actinides, e.g. 236U and 239Pu. A new actinide line is in operation at the Center for Isotopic
Research on Cultural and Environmental heritage (CIRCE) in Caserta, Italy. Using the actinide line a uranium
mass sensitivity of around 4 lg has been reached measuring with a 16-strip silicon detector, and a
239Pu background level of below 0.1 fg has been obtained.
In this work we also discuss preliminary results for environmental and structural samples from in and
around the Garigliano nuclear power plant (GNPP), presently in the decommissioning phase. Measurements
on environmental samples from the vicinity of the plant allow the assessment of contamination,
if any, over the years. Measurements of structural samples from the plant are relevant to the optimization
of the decommissioning program for the GNPP
Actinides AMS at CIRCE and 236U and Pu measurements of structural and environmental samples from in and around a mothballed nuclear power plant
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(Table 2) Age determination of sediment core FR01/97-10
No full textMeasured on Globigerinoides saccullifer >300 µm size fraction. For age determination of sediment core FR01/97-12 see Bostock et al. (2004)
Stable isotopes and ages from sediment core FR01/97-12, Tasman Sea
No full textDeep-sea sediment core FR1/97 GC-12 is located 990 mbsl in the northern Tasman Sea, southwest Pacific, where Antarctic Intermediate Water (AAIW) presently impinges the continental slope of the southern Great Barrier Reef. Analysis of carbon (d13C) and oxygen (d18O) isotope ratios on a suite of planktonic and benthic foraminifera reveals rapid changes in surface and intermediate water circulation over the last 30 kyr. During the Last Glacial Maximum, there was a large d13C offset (1.1 per mil) between the surface-dwelling planktonic foraminifera and benthic species living within the AAIW. In contrast, during the last deglaciation (Termination 1), the d13C(planktonic-benthic) offset reduced to 0.4 per mil prior to an intermediate offset (0.7 per mil) during the Holocene. We suggest that variations in the dominance and direction of AAIW circulation in the Tasman Sea, and increased oceanic ventilation, can account for the rapid change in the water column d13C(planktonic-benthic) offset during the glacial-interglacial transition. Our results support the hypothesis that intermediate water plays an important role in propagating climatic changes from the polar regions to the tropics. In this case, climatic variations in the Southern Hemisphere may have led to the rapid ventilation of deep water and AAIW during Termination 1, which contributed to the postglacial rise in atmospheric CO2
Bulk sediment properties for sediment core FR01/97-13
No full textBulk sediment properties for sediment core FR01/97-1
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