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排序方式: 共有140条查询结果,搜索用时 15 毫秒
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Scientometrics - The concept of Earth system science denotes a shift in the scientific discourse from disciplinary accounts of isolated components of the global environment towards the holistic and... 相似文献
3.
Nassim Ait Mouheb Daniéll Malsch Agnès Montillet Camille Solliec Thomas Henkel 《Chemical engineering science》2012,68(1):278-289
Mass transfer within the T-shaped and cross-shaped micromixers has been studied using CFD and confocal laser scanning microscopy methods. The concentration profiles, based on flow regimes, were used to compare the T- and cross-geometries. The cross-shaped micromixer tends to intensify the mixing and this is occurring for lower flow rates in comparison to the T shape. The improvement made by the cross geometry is attributed to the stronger vortex stretching and high shear rate, which reduces the liquid transfer length. The presence of a single outlet in the T-shaped micromixer induces a smaller degree of freedom for the fluid. A higher pressure drop is calculated in T-shaped micromixer than in cross-shaped micromixer. 相似文献
4.
Systems for distributed event processing have recently gained increasing attention in a broad range of application domains.
This raises the demand for methods to adapt the system design to application-specific needs. Our approach considers (1) trade-offs
regarding the hardware infrastructure and (2) trade-offs in the software design. For the underlying model we categorize events
along the dimensions of temporal complexity and physical distribution. This yields a categorization of events that drives
trade-offs in the infrastructure design. The presented model supports design decisions in dependence on application-specific
event properties and design goals. 相似文献
5.
Agnès Rortais Jenya Belyaeva Monica Gemo Erik van der Goot Jens P. Linge 《Food research international (Ottawa, Ont.)》2010,43(5):1553-1556
We evaluated the Medical Information System (MedISys) as an early-warning system for the detection of food- and feed-borne hazards. Nine hazards were selected in the period from January 2007 to March 2009 from the Rapid Alert System for Food and Feed (RASFF) and traced back on MedISys and ProMED-mail. In addition, from January to March 2009, food- and feed-borne (re-)emerging hazards were monitored on MedISys and traced back on ProMED-mail and RASFF. MedISys has demonstrated to be an effective early-warning system for food- and feed-borne hazards. However, further customization is required to improve its sensitivity, in particular by increasing the number of multi-lingual categories related to food and feed items. MedISys tended to detect food- and feed-borne hazards earlier and more frequently than ProMED-mail, but the information from both systems was often complementary. 相似文献
6.
In this work we use cathodoluminescence (CL) at liquid helium temperature to investigate the boron incorporation in {111}-homoepitaxial diamond films, grown outside the visible plasma ball by the Microwave plasma-assisted chemical vapor deposition (MPCVD) technique. The boron concentration of this set of films covers the whole possible doping range divided into four parts: Low doping (5 × 1016 < [B] < 1.5 × 1019 cm? 3), high doping (1.5 × 1019 < [B] < 3 × 1020 cm? 3), heavy doping (3 × 1020 < [B] < 2 × 1021 cm? 3), and phase separation range ([B] > 2 × 1021 cm? 3). The phase separation occurs for very high boron concentrations, between the diamond phase (sp3 carbon) and the other components of the layer, namely sp2 carbon and boron. A part of them is accumulated outside the diamond lattice.This detailed cathodoluminescence investigation of {111}-homoepitaxial diamond films has led to determining the doping range of the films and following the evolution of their crystalline quality when the boron concentration increases. In addition, a comparison between {111} and {100} films in the same doping ranges has been undertaken. 相似文献
7.
8.
In vitro degradation of 10 mono‐ and sesquiterpenes of plant origin by caprine rumen micro‐organisms
Laurent‐Philippe Broudiscou Agnès Cornu Annie Rouzeau 《Journal of the science of food and agriculture》2007,87(9):1653-1658
The extent of disappearance of 10 mono‐ and sesquiterpenes in presence of mixed rumen micro‐organisms has been measured in 24‐h batch cultures. The molecules that were tested are frequently found in the plants consumed by ruminants in highland pastures (limonene, β‐myrcene, β‐ocimene, α‐pinene, sabinene, γ‐terpinene and thymol) or are potential markers of the diet (camphene, β‐caryophyllene and α‐copaene). All terpenes were tested at 2 µL mL?1, except α‐copaene and thymol, which were tested at 0.9 µL mL?1 and 2 mg mL?1, respectively. Camphene and thymol were not degraded to a significant extent. The disappearance of part of β‐caryophyllene, (?)‐limonene and γ‐terpinene could not be attributed to the direct action of rumen micro‐organisms but rather than to an effect of the extracellular medium. In contrast, a third group of one sesquiterpene (α‐copaene) and four monoterpenes (myrcene, β‐ocimene, α‐pinene and sabinene) was extensively degraded by rumen micro‐organisms, at rates of 1.6, 4.5, 3.5, 4.8 and 5.4 µmol mL?1 inoculum day?1, respectively. The preliminary exposure of rumen micro‐organisms to a specific blend of essential oils compounds, containing mainly thymol, guajacol and limonene, increased the extent of disappearance of γ‐terpinene only. Copyright © 2007 Society of Chemical Industry 相似文献
9.
Vincent Revéret Philippe André Michel Talvard Louis R. Rodriguez Olivier Boulade Eric Doumayrou Pascal Gallais Benoit Horeau Jean Le Pennec Michel Lortholary Jérome Martignac Patrick Agnèse 《Journal of Low Temperature Physics》2008,151(1-2):32-39
The Herschel Space Observatory will carry onboard a new kind of bolometric architecture for the PACS (Photodetector Array
Camera and Spectrometer) submillimeter photometer. These new generation CCD-like multiplexed bolometer arrays are buttable
and enable the conception of large fully sampled focal planes either for space or for ground-based telescopes. We present
here some development for ground-based applications in the context of the ARTEMIS (ARchitecture de bolomètres pour des TElescopes
sub-MIllimétriques au Sol) project. We have developed an electro-thermal numerical model that simulates the performances of
these semiconducting bolometers under specific ground-based conditions (different wavelengths and background powers for example).
This model permits to determine the optimal parameters for each condition and shows that the bolometers can be background
limited in each atmospheric transmission window between 200 and 450 microns. We also describe the optical system that provides
a high optical efficiency in each submillimeter atmospheric window. Astronomical observations made with a prototype on the
APEX telescope are presented. 相似文献
10.
Berge P Ratel J Fournier A Jondreville C Feidt C Roudaut B Le Bizec B Engel E 《Environmental science & technology》2011,45(15):6584-6591
The study investigated the feasibility of using volatile compound signatures of liver tissues in poultry to detect previous dietary exposure to different types of xenobiotic. Six groups of broiler chickens were fed a similar diet either noncontaminated or contaminated with polychlorinated dibenzo-p-dioxins/-furans (PCDD/Fs; 3.14 pg WHO-TEQ/g feed, 12% moisture), polychlorinated biphenyls (PCBs; 0.08 pg WHO-TEQ/g feed, 12% moisture), polybrominated diphenyl ethers (PBDEs; 1.63 ng/g feed, 12% moisture), polycyclic aromatic hydrocarbons (PAHs; 0.72 μg/g fresh matter), or coccidiostats (0.5 mg/g feed, fresh matter). Each chicken liver was analyzed by solid-phase microextraction - mass spectrometry (SPME-MS) for volatile compound metabolic signature and by gas chromatography - high resolution mass spectrometry (GC-HRMS), gas chromatography - tandem mass spectrometry (GC-MS/MS), and liquid chromatography - tandem mass spectrometry (LC-MS/MS) to quantify xenobiotic residues. Volatile compound signature evidenced a liver metabolic response to PAH although these rapidly metabolized xenobiotics are undetectable in this organ by the reference methods. Similarly, the volatile compound metabolic signature enabled to differentiate the noncontaminated chickens from those contaminated with PBDEs or coccidiostats. In contrast, no clear signature was pointed out for slowly metabolized compounds such as PCDD/Fs and PCBs although their residues were found in liver at 50.93 (±6.71) and 0.67 (±0.1) pg WHO-TEQ/g fat, respectively. 相似文献