118 research outputs found
ΠΠΠ ΠΠΠΠΠΠΠΠ ΠΠ ΠΠΠ£Π‘ΠΠΠΠ Π‘ΠΠΠ‘ΠΠΠΠΠ‘Π’Π Π’Π Π£ΠΠΠΠ ΠΠΠΠΠΠ Π€ΠΠΠ¬Π’Π ΠΠ’Π
ΠΠ΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΏΡΠΎΠΏΡΡΠΊΠ½ΠΎΠΉ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ ΡΡΡΠ±ΠΎΠΏΡΠΎΠ²ΠΎΠ΄ΠΎΠ² ΡΠΈΠ»ΡΡΡΠ°ΡΠ° Π΄ΠΈΡΠΊΠΎΠ²ΡΡ
Π²Π°ΠΊΡΡΠΌ-ΡΠΈΠ»ΡΡΡΠΎΠ² Π²ΠΎΠ·Π½ΠΈΠΊΠ°Π΅Ρ, Π½Π°ΠΏΡΠΈΠΌΠ΅Ρ, ΠΏΡΠΈ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠΈ Π½Π°Π³ΡΡΠ·ΠΊΠΈ Π½Π° ΡΠΈΠ»ΡΡΡΡ, ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΈ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΠΈΡΠ°Π½ΠΈΡ, ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠΈΠ»ΡΡΡΠΎΠ²Π°-Π½ΠΈΡ ΠΈΠ»ΠΈ ΠΏΡΠΈ ΠΏΠΎΡΠ²Π»Π΅Π½ΠΈΠΈ ΡΡΠ°ΡΡΠΊΠΎΠ² ΡΡΡΠ±ΠΎΠΏΡΠΎΠ²ΠΎΠ΄ΠΎΠ², Π² ΠΊΠΎΡΠΎΡΡΡ
ΠΈΠ·Π½ΠΎΡ ΠΎΡ ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠΈΠ²Π΅Π» ΠΊ ΠΏΠΎΡΠ΅ΡΠ΅ Π³Π΅ΡΠΌΠ΅ΡΠΈΡΠ½ΠΎΡΡΠΈ ΠΈ ΠΊ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ Π·Π°ΠΌΠ΅Π½Ρ ΠΎΡΠ΄Π΅Π»ΡΠ½ΡΡ
ΡΡΠ°ΡΡΠΊΠΎΠ². ΠΡΠΎΠΏΡΡΠΊΠ½Π°Ρ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΡΡΡΠ±ΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π° Π·Π°Π²ΠΈΡΠΈΡ ΠΎΡ Π΅Π³ΠΎ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΈ ΠΎΡ ΡΡΠ»ΠΎΠ²ΠΈΠΉ Π½Π° Π²Ρ
ΠΎΠ΄Π΅ ΠΈ Π²ΡΡ
ΠΎΠ΄Π΅. ΠΠ° Π²Ρ
ΠΎΠ΄ Π² ΡΡΡΠ±ΠΎΠΏΡΠΎΠ²ΠΎΠ΄ ΠΏΠΎΡΡΡΠΏΠ°Π΅Ρ ΡΠΈΠ»ΡΡΡΠ°Ρ, ΠΏΡΠΎ-ΡΠ΅Π΄ΡΠΈΠΉ ΡΠ΅ΡΠ΅Π· ΡΠ»ΠΎΠΉ ΠΎΡΠ°Π΄ΠΊΠ° ΠΈ ΡΠΈΠ»ΡΡΡΠΎΠ²Π°Π»ΡΠ½ΡΡ ΠΏΠ΅ΡΠ΅Π³ΠΎΡΠΎΠ΄ΠΊΡ. Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ ΠΈΠ·-Π·Π° ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΊΡΡΠΏΠ½ΠΎΡΡΠΈ ΡΠ°ΡΡΠΈΡ ΡΠ²Π΅ΡΠ΄ΠΎΠ³ΠΎ, ΠΏΠΎΡΡΡΠΏΠ°ΡΡΠΈΡ
Π½Π° ΡΠ»ΠΎΡΠ°ΡΠΈΡ, ΠΏΠΈΡΠ°-Π½ΠΈΠ΅ ΡΠ»ΠΎΡΠ°ΡΠΈΠΈ ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΡ ΡΠ°Π·Π±Π°Π²Π»Π΅Π½Π½ΡΠΌ, ΡΡΠΎ ΡΠ½ΠΈΠΆΠ°Π΅Ρ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΠ²Π΅ΡΠ΄ΠΎΠ³ΠΎ ΠΈ Π² ΠΏΠΈΡΠ°Π½ΠΈΠΈ ΡΠΈΠ»ΡΡΡΠΎΠ². ΠΡΠΈ ΡΠ°Π·Π±Π°Π²Π»Π΅Π½Π½ΠΎΠΌ ΠΈ ΠΌΠ΅Π»ΠΊΠΎΠ·Π΅ΡΠ½ΠΈΡΡΠΎΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ ΡΠΈΠ»ΡΡΡΠΎ-Π²Π°Π»ΡΠ½ΡΠ΅ Π΄ΠΈΡΠΊΠΈ Π½Π΅ ΠΏΠΎΠ»Π½ΠΎΡΡΡΡ ΠΏΠΎΠΊΡΡΡΡ ΡΠ»ΠΎΠ΅ΠΌ ΠΎΡΠ°Π΄ΠΊΠ°, ΠΈ ΠΎΠ½ ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ ΡΠ»ΠΈΡΠΊΠΎΠΌ ΡΠΎΠ½ΠΊΠΈΠΌ. ΠΡΠΎ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ Π²Π°ΠΊΡΡΠΌΠ° Π² Π²Π°ΠΊΡΡΠΌΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ ΡΠΈΠ»ΡΡΡΠ°ΡΠ°
ΠΠ΅Ρ Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Al[2]O[3], Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΎΠ΄Π½ΠΎΡΡΠ΅Π½Π½ΡΠΌΠΈ ΡΠ³Π»Π΅ΡΠΎΠ΄Π½ΡΠΌΠΈ Π½Π°Π½ΠΎΡΡΡΠ±ΠΊΠ°ΠΌΠΈ
Subject of this work is a dynamic simulation strategy for PCCI combustion that can be
used in closed-loop control development. A detailed multi-zone chemistry model for the
high-pressure part of the engine cycle is extended by a mean value model accounting for
the gas exchange losses. The resulting stationary model is capable of describing PCCI
combustion sufficiently well. It is at the same time very economic with respect to
computational costs. The model is further extended by identified system dynamics
influencing the stationary inputs. For this, a Wiener model is set up that uses the
stationary model as a nonlinear system representation. In this way, a dynamic nonlinear
model for the representation of the controlled plant Diesel engine is created. This paper
summarizes an important outcome of the the Collaborative Research Centre "SFB 686 -
Modellbasierte Regelung der homogenisierten Niedertemperatur-Verbrennung" at RWTH Aachen
University and Bielefeld University, Germany
Low Temperature Anomaly in Mesoscopic Kondo Wires
We report the observation of an anomalous magnetoresistance in extremely
dilute quasi-one-dimensional AuFe wires at low temperatures, along with a
hysteretic background at low fields. The Kondo resistivity does not show the
unitarity limit down to the lowest temperature, implying uncompensated spin
states. We suggest that the anomalous magnetoresistance may be understood as
the interference correction from the accumulation of geometric phase in the
conduction electron wave function around the localized impurity spin.Comment: Four pages, five figure
Kondo effect in a magnetic field and the magnetoresistivity of Kondo alloys
The effect of a magnetic field on the spectral density of a
Kondo impurity is investigated at zero and finite temperatures by using
Wilson's numerical renormalization group method. A splitting of the total
spectral density is found for fields larger than a critical value
, where is the Kondo scale. The splitting
correlates with a peak in the magnetoresistivity of dilute magnetic alloys
which we calculate and compare with the experiments on
. The linear magnetoconductance of quantum
dots exhibiting the Kondo effect is also calculated.Comment: 4 pages, 4 eps figure
Tuning the 4f-state occupancy of cerium in highly correlated CeSi/ Fe multilayers: a study by x-ray absorption spectroscopy
Spectra of x-ray absorption and magnetic circular dichroism were measured at
M4,5(3d) and L2,3(2p) edges of Ce in multilayers [Ce(1-x)Six/Fe]xn, with x
between 0.1 and 0.65. The study uncovers the highly correlated nature of this
layered system. An alpha-phase like electronic configuration of Ce is observed,
with ordered magnetic moments on the 4f and 5d electrons induced by the
interaction with Fe. Increasing the Si content reduces the strength of the
hy-bridization between the 4f and conduction-band states which is reflected in
a growing occupation and magnetic polarization of the 4f states. Variations of
the shape and intensity of the L2,3-edge dichroism spectra, discussed in a
simple phenomenological model, show the importance of the exchange interaction
between the Ce-4f and 5d electrons, spin polarized by the interaction with Fe
at the interfaces, for the electronic structure of Ce at high Si concentration
and low temperature. A model of the band structure of rare-earth
transition-metal compounds permits to argue that magnetic order on the Ce 4f
electrons in the multilayers is due to different mechanisms: to hybridization
of the Ce-4f with the Fe-3d states at low Si concentration and to intra-atomic
4f-5d exchange at high Si concentration. This is at variance with magnetic
order in the intermetallics CeSi2-delta and CeSi which results from interaction
between the localized 4f magnetic moments mediated by the Si-derived (s,p)
conduction electrons, in competition with the Kondo effect.Comment: 31 pages, 9 figures, submitted to Phys. Rev.
Number and type of vertebral deformities: Epidemiological characteristics and relation to back pain and height loss
Possible robust insulator-superconductor transition on solid inert gas and other substrates
We present observations of the insulator-superconductor transition in
ultrathin films of Bi on amorphous quartz, quartz coated with Ge, and for the
first time, solid xenon condensed on quartz. The relative permeability
ranges from 1.5 for Xe to 15 for Ge. Though we find screening
effects as expected, the I-S transition is robust, and unmodified by the
substrate. The resistance separatrix is found to be close to h/4e^2 and the
crossover thickness close to for all substrates. I-V studies and
Aslamazov-Larkin analyses indicate superconductivity is inhomogeneous. The
transition can be understood in terms of a percolation model.Comment: accepted in Physical Review
KTC De Marke: twee decennia innovaties voor duurzame melkveehouderij
De Marke, Proefbedrijf voor Melkveehouderij en Milieu bestaat dit jaar 20 jaar. Met militaire precisie is destijds de strategie, opzet en ontwikkeling van dit melkveeproefbedrijf door Frans Aarts, Edo Biewinga en Richard Donker vastgelegd in De Marke-rapport nr. 1: 'Melkveehouderij bij stringente milieunormen'. Nu, 20 jaar later, is er mede door hun aanzet meer bereikt dan we voor mogelijk hielden. Koeien melken met minimale belasting van de omgeving: de melkveehouderij is en blijft een gewaardeerde voedselproducent die schoon werkt in een fraai landschap. Alle reden om hier in 2012 uitgebreid bij stil te staan
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