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  • Articles  (170)
  • Physics  (165)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (4)
  • Energy, Environment Protection, Nuclear Power Engineering  (1)
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  • Articles  (170)
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  • 1
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    Measuring line-of-sight-dependent Fourier-space clustering using FFTs (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-07
    Description: Observed galaxy clustering exhibits local transverse statistical isotropy around the line of sight (LOS). The variation of the LOS across a galaxy survey complicates the measurement of the observed clustering as a function of the angle to the LOS, as fast Fourier transforms (FFTs) based on Cartesian grids, cannot individually allow for this. Recent advances in methodology for calculating LOS-dependent clustering in Fourier space include the realization that power spectrum LOS-dependent moments can be constructed from sums over galaxies, based on approximating the LOS to each pair of galaxies by the LOS to one of them. We show that we can implement this method using multiple FFTs, each measuring the LOS-weighted clustering along different axes. The N log N nature of FFTs means that the computational speed-up is a factor of 〉1000 compared with summing over galaxies. This development should be beneficial for future projects such as DESI and Euclid which will provide an order of magnitude more galaxies than current surveys.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
    Published by Oxford University Press
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  • 2
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    Price volatility in ethanol markets (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-24
    Description: This research evaluates price volatility transmission in the Brazilian ethanol industry over time and across markets by using a new methodological approach proposed by Seo. The main advantage of Seo's method is that it allows for joint estimation of the co-integration relationship between the price series investigated and the multivariate generalised autoregressive conditional heteroscedasticity process. It thus allows the responses of both food price levels and volatility to unanticipated shocks to be considered together. Results suggest a strong link between food and energy markets, both in terms of price levels and volatility.
    Keywords: C32 - Time-Series Models, Q11 - Aggregate Supply and Demand Analysis ; Prices
    Print ISSN: 0165-1587
    Electronic ISSN: 1464-3618
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Economics
    Published by Oxford University Press
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  • 3
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    Hydraulic traits are associated with the distribution range of two closely related Mediterranean firs, Abies alba Mill. and Abies pinsapo Boiss. (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-24
    Description: Abies alba and Abies pinsapo are two closely related fir species that occur in the Iberian Peninsula under very different environmental conditions. Abies alba proliferates in the humid European mountains, including the Spanish Pyrenees. In contrast, A. pinsapo is a relict species that occurs in some restricted areas of the Mediterranean mountain ranges in Spain and Morocco, which experience intense summer drought periods. To cope with the high atmospheric evaporative demand during summer, A. pinsapo may either have a high resistance to xylem cavitation or develop a very efficient conducting system to reduce the soil-to-leaf water potential gradient. To investigate such hypotheses, we measured (i) the xylem vulnerability to cavitation for different populations, and (ii) several anatomical and hydraulic parameters indicating xylem sufficiency for ­supplying water to the shoot in two contrasting populations of both species. Our results show that the resistance to cavitation was not different between species or populations. However, hydraulic conductivity ( K h ), specific hydraulic conductivity ( K s ), leaf-specific conductivity (LSC) and whole-shoot hydraulic conductance ( K shoot ) were higher in A. pinsapo , indicating a higher efficiency of water transport, which should contribute to maintaining its xylem tension below the threshold for rapidly increasing cavitation. The higher K s in A. pinsapo was largely a result of its wider tracheids, suggesting that this species may be much more vulnerable to freeze–thaw-induced cavitation than A. alba . This is consistent with the absence of A. pinsapo in northern mountain ranges with cooler winters. These physiological differences could partly explain the niche segregation and the geographical separation of these two firs.
    Print ISSN: 0829-318X
    Electronic ISSN: 1758-4469
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 4
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    The connection between the UV colour of early-type galaxies and the stellar initial mass function revisited (2014)
    Oxford University Press
    Details
    Publication Date: 2014-11-27
    Description: We extend our initial study of the connection between the UV colour of galaxies and both the inferred stellar mass-to-light ratio, * , and a mass-to-light ratio referenced to Salpeter initial mass function (IMF) models of the same age and metallicity, * / Sal , using new UV magnitude measurements for a much larger sample of early-type galaxies, ETGs, with dynamically determined mass-to-light ratios. We confirm the principal empirical finding of our first study, a strong correlation between the GALEX FUV–NUV colour and * . We show that this finding is not the result of spectral distortions limited to a single passband (e.g. metallicity-dependent line-blanketing in the NUV band), or of the analysis methodology used to measure * , or of the inclusion or exclusion of the correction for stellar population effects as accounted for using * / Sal . The sense of the correlation is that galaxies with larger * , or larger * / Sal , are bluer in the UV. We conjecture that differences in the low-mass end of the stellar IMF are related to the nature of the extreme horizontal branch stars generally responsible for the UV flux in ETGs. If so, then UV colour can be used to identify ETGs with particular IMF properties and to estimate * . We also demonstrate that UV colour can be used to decrease the scatter about the Fundamental Plane and Manifold, and to select peculiar galaxies for follow-up with which to further explore the cause of variations in * and UV colour.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 5
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    Male attractiveness and differential testosterone investment in zebra finch eggs (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-03
    Description: Good-genes hypotheses of sexual selection predict that offspring fathered by preferred males should have increased viability resulting from superior genetic quality. Several studies of birds have reported findings consistent with this prediction, but maternal effects are an important confounding variable. Those studies that have attempted to control for maternal effects have only considered differential maternal investment after egg laying. However, female birds differentially deposit testosterone in the eggs, and this influences the development of the chick. This study shows that female birds deposit higher amounts of testosterone and 5alpha-dihydrotestosterone in their eggs when mated to more attractive males.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gil, D -- Graves, J -- Hazon, N -- Wells, A -- New York, N.Y. -- Science. 1999 Oct 1;286(5437):126-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Environmental and Evolutionary Biology, University of St. Andrews, St. Andrews, Fife KY16 9TS, UK. Diego.Gil@u-paris10.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10506561" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dihydrotestosterone/metabolism ; Egg Yolk/metabolism ; Female ; Male ; Oviposition ; Ovum/*metabolism ; Random Allocation ; *Sexual Behavior, Animal ; Songbirds/genetics/*physiology ; Testosterone/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Support for a colleague (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alatalo, R V -- Aragon, S -- Aviles, J M -- Barbosa, A -- Gomes, C Bessa -- Cadee, N -- Christe, P -- Cuervo, J J -- Diaz, M -- Erritzoe, J -- Galeotti, P -- Garamszegi, L Z -- Gil, D -- Gontard-Danek, M -- Legendre, S -- Martin, T E -- Martinez, J -- Martin-Vivaldi, M -- Martinez, J G -- Merino, S -- Moreno, J -- Mousseau, Tim -- Ninni, P -- Petrie, M -- Pulido, F -- Rubolini, D -- Saino, N -- Soler, J J -- Soler, M -- Spottiswoode, C -- Szep, T -- Thornhill, R -- Zamora, C -- Sacchi, Roberto -- New York, N.Y. -- Science. 2004 Mar 12;303(5664):1612.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15016981" target="_blank"〉PubMed〈/a〉
    Keywords: *Ecology ; Publishing ; *Scientific Misconduct
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Leaf functional plasticity decreases the water consumption without further consequences for carbon uptake in Quercus coccifera L. under Mediterranean conditions (2016)
    Oxford University Press
    Details
    Publication Date: 2016-03-19
    Description: The accumulation of epicuticular waxes over stomata in Quercus coccifera L. contributes to a severe reduction in maximum stomatal conductance ( g s,max ) under Mediterranean (MED) conditions. However, this phenomenon was not observed in this species under temperate (TEM) conditions, which could lead to differences in the ability to assimilate CO 2 between the sites. We hypothesise that the overall importance of such a reduction in g s,max on photosynthesis is modulated by other factors affecting carbon gain, mainly mesophyll conductance to CO 2 ( g m ), through a plastic response to changes in environmental conditions (i.e., vapour pressure deficit, VPD, and mean daily quantum flux density, Q int ). The results reveal that leaves grown at the TEM site did not show an increased ability for net CO 2 assimilation ( A N ), mainly due to an equal g m at both sites. This fact is explained by a trade-off between an increased conductance of the gas phase ( g ias ) and a reduced conductance of the liquid phase ( g liq ) at the TEM site compared with the MED site. In spite of the reduction in g s,max at the MED site, transpiration ( E ) did not diminish during midsummer to the levels of the TEM site due to a higher VPD found at the MED site, yielding a higher water use efficiency ( A N / E ) at the TEM site. Moreover, photosynthetic nitrogen use efficiency was also higher at the TEM site, indicating these leaves can reach similar values of A N with lower nitrogen investment that those at the MED site. These results suggest that Q. coccifera does not always use the main resources (water and nutrients) at leaf level as efficiently as possible. Moreover, the different patterns of resource use (in particular N), together with the functional plasticity, cannot overcome the morpho-functional constraints that limit photosynthetic activity, even under potentially favourable conditions.
    Print ISSN: 0829-318X
    Electronic ISSN: 1758-4469
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 8
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    A nonlinear control approach for hybrid solar thermal plants based on operational conditions (2021)
    Elsevier
    Details
    Publication Date: 2021-10-01
    Print ISSN: 0960-1481
    Electronic ISSN: 1879-0682
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 9
    Electronic Resource
    Electronic Resource
    One-nucleon removal cross-sections for 17, 19C and 8, 10B (2001)
    Springer
    The European physical journal 10 (2001), S. 49-56 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 25.60.Gc Breakup and momentum distributions – 27.20.+n Properties of specific nuclei 6≤A≤19
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: One-neutron removal cross-sections ( ) of 17, 19C in various targets at about 900 MeV/nucleon, and one-proton removal cross-sections ( ) of 8, 10B at about 1400 MeV/nucleon were measured using the fragment separator FRS at GSI. A significant increase of for 19C compared to its neighbors was observed. The same behavior was found for for the neutron-deficient nucleus 8B compared to the stable isotope 10B. These results support a one-neutron halo structure in 19C and a one-proton halo in 8B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170143
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  • 10
    Electronic Resource
    Electronic Resource
    Interactions of 13.8 GeV/c protons with heavy nuclei in emulsion exposed in a strong magnetic field
    Amsterdam : Elsevier
    Nuclear Physics 82 (1966), S. 662-672 
    Details
    ISSN: 0029-5582
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-5582(66)90481-0
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