808 research outputs found
Nano Positioning of Single Atoms in a Micro Cavity
The coupling of individual atoms to a high-finesse optical cavity is
precisely controlled and adjusted using a standing-wave dipole-force trap, a
challenge for strong atom-cavity coupling. Ultracold Rubidium atoms are first
loaded into potential minima of the dipole trap in the center of the cavity.
Then we use the trap as a conveyor belt that we set into motion perpendicular
to the cavity axis. This allows us to repetitively move atoms out of and back
into the cavity mode with a repositioning precision of 135 nm. This makes
possible to either selectively address one atom of a string of atoms by the
cavity, or to simultaneously couple two precisely separated atoms to a higher
mode of the cavity.Comment: 4 pages 5 figure
ΠΠ°Π³Π½ΠΈΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ Π΄Π»Ρ ΠΏΡΠΈΠ²ΠΎΠ΄Π° ΡΡΠ»Π΅Π²ΠΎΠΉ ΠΊΠΎΠ»ΠΎΠ½ΠΊΠΈ Π°Π²ΡΠΎΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°
ΠΠ°ΡΡΠ½Π°Ρ ΠΊΠ²Π°Π»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΎΠ½Π½Π°Ρ ΡΠ°Π±ΠΎΡΠ° ΠΏΠΎΡΠ΅ΡΠ΅Π½Π° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠ»ΡΡΠ°ΡΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΌΠΎΠΌΠ΅Π½ΡΠ° Π² ΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΌ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Π΅ ΡΡΠ»Π΅Π²ΠΎΠΉ ΠΊΠΎΠ»ΠΎΠ½ΠΊΠΈ Π°Π²ΡΠΎΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°. Π ΠΏΠ΅ΡΠ²ΠΎΠΉ Π³Π»Π°Π²Π΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ ΠΎΠ±Π·ΠΎΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π½Π° ΡΠ΅ΠΌΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ°ΡΠΈΠ½ Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΊΠΎΠΌΠΏΠΎΠ½ΠΎΠ²ΠΊΠΎΠΉ ΠΌΠ°Π³Π½ΠΈΡΠΎΠ² Π½Π° ΡΠΎΡΠΎΡΠ΅ ΠΈ ΠΎΡΡΡΠ΅ΡΡΠ²Π»Π΅Π½Π° ΠΏΠΎΡΡΠ°Π½ΠΎΠ²ΠΊΠ° Π·Π°Π΄Π°ΡΠΈ Π½Π°ΡΡΠ½ΠΎΠΉ ΠΊΠ²Π°Π»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ. ΠΠΎ Π²ΡΠΎΡΠΎΠΉ Π³Π»Π°Π²Π΅ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ Π²ΠΎΠΏΡΠΎΡΡ ΠΈΠΌΠΈΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠ°ΡΠΈΠ½Ρ Π² ΠΊΠΎΠ½Π΅ΡΠ½ΠΎ-ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΠΎΠΉ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΠ½ΠΎΠΉ ΡΡΠ΅Π΄Π΅. ΠΡΠΏΠΎΠ»Π½Π΅Π½ΠΎ ΠΏΠ»Π°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°, ΠΏΠΎΠ»ΡΡΠ΅Π½Π° Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·Ρ ΠΌΠ΅ΠΆΠ΄Ρ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎΠΌ ΠΏΠ°Π·ΠΎΠ² ΡΠΎΡΠΎΡΠ°, Π·ΡΠ±ΡΠ°ΠΌΠΈ ΡΡΠ°ΡΠΎΡΠ°, ΠΊΠΎΡΡΡΠΈΡΠΈΠ²Π½ΠΎΠΉ ΡΠΈΠ»Ρ ΠΌΠ°Π³Π½ΠΈΡΠΎΠ² Ρ ΠΏΠΎΠ·ΠΈΡΠΈΠΈ Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΌΠΎΠΌΠ΅Π½ΡΠ°. Π ΡΡΠ΅ΡΡΠ΅ΠΉ Π³Π»Π°Π²Π΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ ΡΠ°ΡΡΠ΅Ρ ΡΠ²ΡΠ·Π°Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ-ΠΈΠ½Π²Π΅ΡΡΠΎΡ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΡ-ΡΠΈΡΡΠ΅ΠΌΠ° ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ.Scientific qualification work is visited to a research of pulsations of the electromagnetic torque in the magnetoelectric motor of a steering column of the vehicle. In chapter 1 the review of researches on magnetoelectric machine with various configuration of magnets on a rotor is executed and problem definition of scientific qualification work is carried out. In chapter 2 questions of a simulation modeling of the magnetoelectric machine in the terminating and element computer environment are considered. Scheduling of an experiment is executed, the interrelation between quantity of poles of a rotor, tooths of a stator, a coercive force of magnets from a position of values of the electromagnetic torque is received. In a chapter 3 calculation of the bound model the magnetoelectric motor
Comparison of data-driven uncertainty quantification methods for a carbon dioxide storage benchmark scenario
A variety of methods is available to quantify uncertainties arising with\-in
the modeling of flow and transport in carbon dioxide storage, but there is a
lack of thorough comparisons. Usually, raw data from such storage sites can
hardly be described by theoretical statistical distributions since only very
limited data is available. Hence, exact information on distribution shapes for
all uncertain parameters is very rare in realistic applications. We discuss and
compare four different methods tested for data-driven uncertainty
quantification based on a benchmark scenario of carbon dioxide storage. In the
benchmark, for which we provide data and code, carbon dioxide is injected into
a saline aquifer modeled by the nonlinear capillarity-free fractional flow
formulation for two incompressible fluid phases, namely carbon dioxide and
brine. To cover different aspects of uncertainty quantification, we incorporate
various sources of uncertainty such as uncertainty of boundary conditions, of
conceptual model definitions and of material properties. We consider recent
versions of the following non-intrusive and intrusive uncertainty
quantification methods: arbitary polynomial chaos, spatially adaptive sparse
grids, kernel-based greedy interpolation and hybrid stochastic Galerkin. The
performance of each approach is demonstrated assessing expectation value and
standard deviation of the carbon dioxide saturation against a reference
statistic based on Monte Carlo sampling. We compare the convergence of all
methods reporting on accuracy with respect to the number of model runs and
resolution. Finally we offer suggestions about the methods' advantages and
disadvantages that can guide the modeler for uncertainty quantification in
carbon dioxide storage and beyond
Rurality and Tourism in Transition: How Digitalization Transforms the Character and Landscape of the Tourist Economy in Rural Morocco
The character of rural Morocco is changing due to increasing tourism and social media usage. This paper outlines the different consequences of ICT usage among people working in the tourism sector as part of the transitional economy in a remote area. In this region, tourism has grown into one major income sources for a few valley inhabitants β mostly men with a school education, digital and language skills, and who are financially stable. As this transitional economy evolves alongside digitalization and ICT usage and therefore a change of the regionβs rural character, it leads to challenges and concerns for the local population. This ethnographic study analyzes the interdependence of increasing tourism through digitalization and the notion of rurality as a resource from a sociotechnical perspective
Systematics and evolution of Carmichaelia, Chordospartium, Corallospartium, and Notospartium (Fabaceae) from New Zealand
All names in Carmichaelia, Chordospartium, Corallospartium, and Notospartium were typified, with many names requiring the selection of a lectotype. A taxonomic revision was undertaken of Carmichaelia, with seventeen species accepted as indigenous to New Zealand. A major taxonomic problem in Notospartium was resolved using morphological and habitat data. Two species of Notospartium are indigenous to Marlborough, these being separated by fault lines and each is associated with different parent materials.
Wood anatomy of most species of Carmichaelia, Chordospartium, Corallospartium, and Notospartium was described to provide phylogenetically informative characters. The wood is characterised by vessels with helical thickenings and simple perforations; vessels, axial parenchyma, and short rays arranged in storied structure; predominantly fusiform parenchyma; and rays up to 20 cells wide. Developmental studies showed that Carmichaelia, Chordospartium, Corallospartium, and Notospartium exhibit habit- and leaf-heteroblastic development.
A phylogenetic analysis using 47 mainly anatomical and morphological characters was undertaken using parsimony analysis. This analysis provided evidence that Carmichaelia is paraphyletic if Chordospartium, Corallospartium, and Notospartium are excluded, but monophyletic if these taxa are included in Carmichaelia. It is recommended that Carmichaelia be recircumscribed to include Chordospartium, Corallospartium, and Notospartium. Among the outgroup species Swainsona novae-zelandiae is shown to differ from Australian Swainsona by significant anatomical characters. To more accurately reflect its evolutionary history it is recommended that it be placed in a new and monotypic New Zealand genus
Community-based learning workshop: Explorations into theoretical groundings, empirical findings, and computer support
Workshop paper presented at the 6th International Conference of the Learning Sciences, ICLS '04, Santa Monica, CA. Retrieved July 18, 2007 from http://www.cis.drexel.edu/faculty/gerry/icls_learning_workshop.pdf
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