39 research outputs found
Three-dimensional inversion of magnetotelluric data from the Central Andean continental margin
Magnetotelluric data were collected in the late 1990s in the Central Andes of
Chile and Bolivia, with the aim to delineate the electrical conductivity
distribution in the subsurface and its relations to subduction processes. In
previous studies, these data were interpreted based on 2-D models. The
principal result was a vast conductivity zone beneath the Altiplano high
plateau at mid and lower crustal depths and a much smaller, though significant
conductor associated with the Precordillera Fault System. However, there are
some significant 3-D effects in the investigation area, in particular near the
coast and on the eastern Altiplano. The aim of this work is to give a
reinterpretation based on new 3-D inversion of these data. The 3-D inversion
not only provides a better fit to the data compared to 2-D results but
furthermore allows to include sites with strong telluric distortion which were
ignored in previous studies. We are now able to explain anomalous phases above
90° and induction arrows pointing subparallel to the coast as observed at
several sites in the Coastal Cordillera. These strongly distorted data are
caused by highly conductive near-surface structures that are partly connected
to the Pacific Ocean, forcing currents to flow around the sites. The lower
crust beneath the Coastal Cordillera resembles a poorly conductive, nearly
homogeneous half-space and is electrically unremarkable. Besides, we can now
image the Precordillera conductor as a continuous, elongated feature. The
volcanic arc of the Western Cordillera is highly resistive with the exception
of a few conductive spots which may be associated with certain individual
volcanoes or geothermal resources, respectively. The Altiplano conductor is
again the dominant electrical feature in the Central Andes, indicating
widespread melting of the middle and lower back-arc crust
Математическое моделирование процессов тепло- и массопереноса в условиях интенсивного локального лазерного нагрева многослойной полиметаллической пластины.
Проведено математическое моделирование процессов теплопереноса, протекающих совместно в условиях интенсивных фазовых превращений (плавление и испарение металлов) при лазерном воздействии на диметаллическую мишень. По результатам численного моделирования установлено, что мощность лазера оказывает существенное влияние на динамику процесса плавления. Показано, что испарение металла в пограничный слой пластины также может оказывать существенное влияние на характеристики теплопереноса. Установлено, что металлические пары, формируя в пристеночной области газовую смесь могут поглощать лазерное излучение и вызывать явление оптического резонанса при повышении их концентрации критического значения, другими словами, при плавлении металла возможен оптический пробой.Mathematical modeling of heat transfer processes proceeding together under conditions of intense phase transformations (melting and evaporation of metals) under laser action on a dimetallic target has been carried out. Based on the results of numerical simulation, it is established that the laser power exerts a significant influence on the dynamics of the melting process. It is shown that evaporation of metal in the boundary layer of the plate can also have a significant effect on the heat transfer characteristics. It is established that metal vapors forming a gas mixture in the near-wall region can absorb laser radiation and cause the phenomenon of optical resonance with increasing their critical concentration, in other words, when the metal melts, optical breakdown is possible
Intake of grape-derived polyphenols reduces C26 tumor growth by inhibiting angiogenesis and inducing apoptosis.
International audienc
Biomarkers of Nutrition for Development (BOND)—Iron Review
This is the fifth in the series of reviews developed as part of the Biomarkers of Nutrition for Development (BOND) program. The BOND Iron Expert Panel (I-EP) reviewed the extant knowledge regarding iron biology, public health implications, and the relative usefulness of currently available biomarkers of iron status from deficiency to overload. Approaches to assessing intake, including bioavailability, are also covered. The report also covers technical and laboratory considerations for the use of available biomarkers of iron status, and concludes with a description of research priorities along with a brief discussion of new biomarkers with potential for use across the spectrum of activities related to the study of iron in human health. The I-EP concluded that current iron biomarkers are reliable for accurately assessing many aspects of iron nutrition. However, a clear distinction is made between the relative strengths of biomarkers to assess hematological consequences of iron deficiency versus other putative functional outcomes, particularly the relationship between maternal and fetal iron status during pregnancy, birth outcomes, and infant cognitive, motor and emotional development. The I-EP also highlighted the importance of considering the confounding effects of inflammation and infection on the interpretation of iron biomarker results, as well as the impact of life stage. Finally, alternative approaches to the evaluation of the risk for nutritional iron overload at the population level are presented, because the currently designated upper limits for the biomarker generally employed (serum ferritin) may not differentiate between true iron overload and the effects of subclinical inflammation
Synthese funktionalisierter Cobaltoceniumsalze und ihre Anwendung in katalytischen Reaktionen
Synthese funktionalisierter Cobaltoceniumsalze und ihre Anwendung in katalytischen Reaktionen
Évaluation de l'efficacité du TAP bloc dans le cadre de l'analgésie postopératoire après prostatectomie (cœlioscopie robot et laparotomie)
TOULOUSE3-BU Santé-Centrale (315552105) / SudocSudocFranceF
Design and Integration of a High Accuracy Multichannel Analog CMOS Peak Detect and Hold Circuit for APD-Based PET Imaging
Rheology Study of Silica−Zirconia Sols for Elaboration of Silica−Zirconia Nanostructured Optical Fibers by Inverse Dip Coating
International audienceThis article exposes a study of the rheological properties of silica−zirconia sols in acidic conditions, which are used for the development of nanostructured optical fibers by an original “inverse dip-coating” method. This new generation of optical fibers, which contains zirconia nanocrystals dispersed inside an amorphous pure silica core, must present a homogeneous core to allow good waveguiding properties. Thus, good control of the rheological properties of the silica−zirconia sols at its origin is needed to optimize the development process. After having described the chemical synthesis of the sols, the principle of the rheological measurement is then explained and a short reminder of a few and essential rheological notions is provided. The evolution of the rheological behavior of the sols is then studied as a function of the time and thus as a function of the polymerization advancement. Finally, in order to extend and stabilize the development process of these fibers, an estimation of the sol viscosity is done by taking into account the different viscosity designation notions that are inherent to the flow regime of the fluid