4,521 research outputs found
Эмманюэль Левинас: "лицо" как абсолютное выражение
Проводится анализ ключевой для метафизики современного французского мыслителя Эмманюэля Левинаса категории "лица" как своего рода "истока" всякого смысла. Анализ направляется вопросом о соотношении онтологического и этического регистров смысла, в свете которого рассматривается также возможная аналогия лица и (эстетического) образа, в частности - в его трактовке у Мориса Бланшо
High-energy-low-temperature technologies for the synthesis of nanoparticles: Microwaves and high pressure
Microwave Solvothermal Synthesis (MSS) is a chemical technology, where apart from possible effects of microwaves on the chemical reaction paths, microwave heating allows the precise planning of a time-temperature schedule, as well as to achieve high super-saturation of the reagents uniformly in the reactor vessel. Thus, MSS is suitable for production of nanoparticles with small grain size distribution and a high degree of crystallinity. A further advantage of the technology is a much lower synthesis temperature than for gas phase, plasma or sol-gel technologies. New reactors have been developed to exploit these advantages of the MSS technology of nanoparticles synthesis and to scale up the production rate. Reactor design and realization has been shown to be decisive and critical for the control of the MSS technology. Examples of oxidic and phosphatic nanoparticles synthesis have been reported
Excited state structure of 4-(dimethylamino)benzonitrile studied by femtosecond mid-infrared spectroscopy and ab initio calculations.
Effect of Pressure on Synthesis of Pr-Doped Zirconia Powders Produced by Microwave-Driven Hydrothermal Reaction
A high-pressure microwave reactor was used to study the hydrothermal synthesis of
zirconia powders doped with 1 mol % Pr. The synthesis was performed in the pressure range
from 2 to 8 MPa corresponding to a temperature range from 215C∘ to 305C∘. This technology
permits a synthesis of nanopowders in short time not limited by thermal inertia of the vessel.
Microwave heating permits to avoid contact of the reactants with heating elements, and is thus
particularly well suited for synthesis of doped nanopowders in high purity conditions.
A mixture of ZrO2 particles with tetragonal and monoclinic crystalline phases, about 15 nm in size, was obtained.
The p/T threshold of about 5-6 MPa/265–280C∘ was necessary to obtain good quality of
zirconia powder. A new method for quantitative description of grain-size distribution was applied, which is
based on analysis of the fine structure of the X-ray diffraction line profiles. It permitted to
follow separately the effect of synthesis conditions on the grain-size distribution of the
monoclinic and tetragonal phases
ATLAS Data Transfer Functional Test (October 2006)
Data transfer function test was conducted in October 2006. DDM software components were used to transmit, control and monitor data movement. The main purpose of the test was to check system functionality during data transfer from CERN ATLAS centers. The issue of large files transfer is also have been tested
Spectroscopy of Na: Bridging the two-proton radioactivity of Mg
The unbound nucleus Na, the intermediate nucleus in the two-proton
radioactivity of Mg, was studied by the measurement of the resonant
elastic scattering reaction Ne(p,Ne)p performed at 4 A.MeV.
Spectroscopic properties of the low-lying states were obtained in a R-matrix
analysis of the excitation function. Using these new results, we show that the
lifetime of the Mg radioactivity can be understood assuming a sequential
emission of two protons via low energy tails of Na resonances
Operations of and Future Plans for the Pierre Auger Observatory
Technical reports on operations and features of the Pierre Auger Observatory,
including ongoing and planned enhancements and the status of the future
northern hemisphere portion of the Observatory. Contributions to the 31st
International Cosmic Ray Conference, Lodz, Poland, July 2009.Comment: Contributions to the 31st ICRC, Lodz, Poland, July 200
The Pierre Auger Observatory III: Other Astrophysical Observations
Astrophysical observations of ultra-high-energy cosmic rays with the Pierre
Auger ObservatoryComment: Contributions to the 32nd International Cosmic Ray Conference,
Beijing, China, August 201
Measurement of the Depth of Maximum of Extensive Air Showers above 10^18 eV
We describe the measurement of the depth of maximum, Xmax, of the
longitudinal development of air showers induced by cosmic rays. Almost four
thousand events above 10^18 eV observed by the fluorescence detector of the
Pierre Auger Observatory in coincidence with at least one surface detector
station are selected for the analysis. The average shower maximum was found to
evolve with energy at a rate of (106 +35/-21) g/cm^2/decade below 10^(18.24 +/-
0.05) eV and (24 +/- 3) g/cm^2/decade above this energy. The measured
shower-to-shower fluctuations decrease from about 55 to 26 g/cm^2. The
interpretation of these results in terms of the cosmic ray mass composition is
briefly discussed.Comment: Accepted for publication by PR
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