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

Магнитоэлектрический двигатель для привода рулевой колонки автотранспортного средства

Научная квалификационная работа посещена исследованию пульсаций электромагнитного момента в магнитоэлектрическом двигателе рулевой колонки автотранспортного средства. В первой главе выполнен обзор исследований на тему магнитоэлектрических машин с различной компоновкой магнитов на роторе и осуществлена постановка задачи научной квалификационной работы. Во второй главе рассмотрены вопросы имитационного моделирования магнитоэлектрической машины в конечно-элементной компьютерной среде. Выполнено планирование эксперимента, получена взаимосвязь между количеством пазов ротора, зубцами статора, коэрцитивной силы магнитов с позиции значений электромагнитного момента. В третьей главе выполнен расчет связанной модели магнитоэлектрический двигатель-инвертор напряжения-система управления.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 – 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 region’s 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