86,789 research outputs found
Further constraints on the diagenetic influences and salinity effect on Globigerinoides ruber (white) Mg/Ca thermometry: Implications in the Mediterranean Sea
No full textWe analyzed Mg/Ca ratios of the planktonic species Globigerinoides ruber (white) picked from 49 box core samples covering the whole Mediterranean Sea and 2 core tops from the Atlantic Ocean. Over the entire data set, we found no significant correlation between Mg/Ca and delta(18)O-derived calcification temperatures. This lack of correlation is chiefly due to the presence of an early diagenetic, Mg-rich calcite coating, which can constitute up to 20% of the total shell calcite in the central and eastern Mediterranean basin and result in anomalously high Mg/Ca values and a high scattering. In the western Mediterranean Sea, however, G. ruber Mg/Ca scattering shows smaller amplitude and Mg-rich calcite remains under the XRD detection limit. SEM observations indicate that only a few samples are affected by trace amounts of post-mortem calcite overgrowths (most of this calcite being likely removed during the chemical cleaning for Mg/Ca analyses). Using core top sediments from the western Mediterranean Sea, we performed an empirical calibration exercise, which confirms that G. ruber Mg/Ca is not only related to temperature but it is also significantly affected by sea surface salinity. This salinity effect is not specific to high salinity environments such as the Mediterranean Sea, since it appears to be coherent with recent results obtained on Indo-Pacific and Atlantic surface sediments, which suggest that a +1 (psu) change in SSS results in a +1.7 degrees C Mg/Ca-temperature bias. This sensitivity to salinity is significantly higher than those deduced from culture experiments
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Marine and terrestrial climate variability in the western Mediterranean Sea during marine isotope stages 20 and 19
No full textThe climate variability within late Marine Isotope Stage (MIS) 20 and MIS 19 is examined with particular reference to the response of marine and terrestrial realms in the area surrounding the Alboran Sea (western Mediterranean Sea). Sediment samples from the Ocean Drilling Program Site 976 were used to derive high temporal resolution (average resolution of 450 years) palynological (pollen and spores) and calcareous plankton (coccolithophores and foraminifera) records. These data, together with the new δ18OG.bulloides, make it possible to discuss the paleoenvironmental changes within a well constrained chronological frame. Cooler phases, including late MIS 20 and several cold spells during MIS 19b-a, are marked, on land, by the expansion of open vegetation formations dominated by steppe and semi-desert taxa. At the same time, the western Mediterranean Sea is marked by the incursion of North Atlantic polar-water planktonic taxa. MIS 19c and interstadials of MIS 19b-a are characterized by the spread of prevalent temperate forest taxa that parallel the expansion of warm-water calcareous plankton taxa during periods of lighter δ18O. Climate variations at both precessional and millennial to sub-millennial time-scales, expressed by on land and marine signals, highlight the sensitivity of the western Mediterranean area to both orbital forcing and rapid internal oscillations of the climate systems involving remote connections with North Hemisphere high latitudes. The correlation within the central-western Mediterranean and North Atlantic climate dynamics including the time/spatial gradients related to regional and global climate processes contributes to the reconstruction of the Earth climate dynamics and marine vs land responses, in full Early-Middle Pleistocene transition. These new evidences also provide an opportunity to improve knowledge of MIS 19c now considered, due to its orbital geometry, the best orbital analogue to the Holocene
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Maine author Franklin F. Gould recalls his first glimpse of the outside world
No full textMaine author Franklin F. Gould recalls his first glimpse of the outside world as he relates how, as a young farm boy in the late 1800\u27s, he drove his father\u27s horses on an errand to an icebound river
Paleoproductivity Modes in Central Mediterranean during MIS 20—MIS 18: Calcareous Plankton and Alkenone Variability.
No full textPaleoproductivity is reconstructed across a Mediterranean benchmark record, the
Early/Middle Pleistocene Montalbano Jonico section, cropping out in southern Italy. High-resolution
coccolithophore and alkenone data (C37 and C37:2/C38:2 ratio) were collected in order to extend the data set
on Mediterranean paleoproductivity pattern and forcing mechanisms. The multi-proxy record indicates
low productivity during glacial and stadial phases and enhanced productivity during interglacial and
interstadials. Increased surface water turbidity, cold-water temperature and polar-subpolar low salinity
water incursion appear as the dominant controls for low productivity during Marine Isotope Stage
(MIS) 20. Enhanced productivity during MIS 19c was sustained by warmer surface waters, coupled with
a seasonal precipitation regime, providing higher nutrient availability. Productivity increases during
interstadials with respect to stadials, in relation with enhanced land-derived nutrient input through river
discharge during wetter winters. The productivity scenario we propose is similar to those reconstructed
from deep-sea records in the central and western Mediterranean during Dansgaard-Oeschger oscillations
over the last 70 ka. This indicates that similar forcing mechanisms acted on productivity dynamics on
a regional scale over different times. We suggest that migration of the westerly wind system over the
Mediterranean and the polar water inflow influenced productivity on a regional scale. The acquired data
set provides new evidences on the environmental significance of the C37:2/C38:2 ratio and on its relation
with surface water productivity
Mapping the Discipline of the Olympic Games An Author-Cocitation Analysis
No full textThe authors conducted an author cocitation analysis on prominent authors writing about the Olympics during the 1990s. Author cocitation is an established bibliometric technique that can be used to measure the relative similarities of topics written about by the cited authors. This enables a visual representation of the “intellectual space” of the discipline, in this case the Olympics, to be created for the period under review. So core and peripheral research areas are identified, along with their major contributors. The representation appears as a two-dimensional cluster-enhanced map. Subject expertise was then applied to the results to place labels on the generated clusters of authors and their topics
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