Ultracold atoms in multiple-radiofrequency dressed adiabatic potentials

We present the first experimental demonstration of a multiple-radiofrequency dressed potential for the configurable magnetic confinement of ultracold atoms. We load cold $^{87}$Rb atoms into a double well potential with an adjustable barrier height, formed by three radiofrequencies applied to atoms in a static quadrupole magnetic field. Our multiple-radiofrequency approach gives precise control over the double well characteristics, including the depth of individual wells and the height of the barrier, and enables reliable transfer of atoms between the available trapping geometries. We have characterised the multiple-radiofrequency dressed system using radiofrequency spectroscopy, finding good agreement with the eigenvalues numerically calculated using Floquet theory. This method creates trapping potentials that can be reconfigured by changing the amplitudes, polarizations and frequencies of the applied dressing fields, and easily extended with additional dressing frequencies.Comment: 16 pages, 6 figure

Introduction – Towards Systemic Approaches to Evaluation and Impact

This IDS Bulletin is the second of two that follow an Institute of Development Studies event seeking to define an agenda for research and practice of development impact evaluation. It focuses on exploring the potential of systems ideas and complexity concepts to meet the increasingly complex challenges of an increasingly ambitious development agenda. In particular, the contributions seek to: (a) redefine ‘learning’ according to the number of ‘learning loops’ involved; (b) understand how to identify the most relevant impact evaluation questions; (c) simulate systems states in two sectors (leather and health) following the implementation of (combinations of) different policy options and other events; and finally, (d) shake the foundations of the impact evaluation institutional system, recommending that the notions of multiple perspectives and system boundaries are fully embraced, and that the system ultimately transitions from an ‘evaluation industrial complex’ to an ‘evaluation adaptive complex’. While the issue is a step in the right direction, much more work remains to be done

UAS Literary & Arts Journal

Proof copy provided by Tidal Echoes.The 2015 edition of Tidal Echoes presents an annual showcase of writers and artists who share one thing in common: a life surrounded by the rainforests and waterways of Southeast Alaska.Dedication -- Editor’s Note -- Mid-Air -- Acknowledgements -- Salmon (Gohan Desu Yo/It’s Dinner Time) -- Xwaayeenák Richard Dauenhauer -- Loon -- Burney Falls -- Richard Dauenhauer -- Egg Carton Fox -- August Afternoon at Helle’s Pool, Vancouver, Washington -- Oak Run -- Buddy Tabor teaches me to filet a halibut -- Icelander -- Home -- Season’s End -- Young Me, Old Me -- The Window Seat -- Wind -- UAS Student Back Study -- Paintbrush Conversations -- Grey River Soulshine -- Across the Universe -- Aurora-Skaters’ Cabin 1 -- Whiskey and Autumn -- Leaf Wolf -- Spring Cleaning the Perennials -- Ode to a Rose -- Final Point -- After Spring Recital -- Olympic Ceiling -- Rodda-Hard going (too little snow) -- Birch Bark Calligraphy No. 2 -- Fishtailing -- Working the Corks -- Modern Alaskan Storyteller: An Interview with Ishmael Hope -- Bailer at the Back of the Boat (Excerpt) -- Close Up -- Bothering the Dauenhauers -- In Memory of Andrew Hope III -- Wolf Brimhat -- I Am From -- Crossing -- Revelations and Realizations -- The Shrinking Girl -- Untitled (Andi in Niki’s Room) -- Afternoon Reading, Rainy Room -- My Grandmother’s House in Metlakatla -- Deacon Charles Rohrbacher, Icon of St. Nicholas -- Honoring Tibet -- Fumi Matsumoto: Finding Art in Culture -- Pathway of Thorns -- Minidoka Interlude -- Mountain Dew Parrots -- Watch Out for Falling Objects -- Loose Change -- An Unkind Demise -- A Place That Holds Names -- Immortality (skull side) -- Opening Again the Box of Wisdom -- Iff’n I Go -- Colorless Blues -- The Heartsdance -- King of Dreams -- Hungering -- Colonialism -- Inside Out -- Rachel Day -- Lying Here -- Note to Wife -- Death -- Round the Clock -- Untitled (trap) -- Seeds of Racism -- Auschwitz Remembrance -- Moab 1 -- Pearl of the Orient -- Moab 3 -- Scars -- Transporting -- In Eliason Harbor -- Poet Passes: Leaves Words Behind -- Tough Guy -- Wolf Helmet -- Biographie

UAS Literary & Arts Journal

Proof copy provided by Tidal Echoes.The 2016 edition of Tidal Echoes presents an annual showcase of writers and artists who share one thing in common: a life surrounded by the rainforests and waterways of Southeast Alaska.a heart is a heavy burden -- Editor’s Note -- Acknowledgements -- Always a Pause -- Untitled -- Mishima Teabowls -- Mint Tea and Red Wine -- The Dry Winter Scent of Prairies -- Northern Sunrise -- Musical Theory in a Falling Tree -- Jumbo Lookout -- The Shape of an Echo -- Wonderwall -- It’s Difficult [excerpt from the poem “Marissa”] -- Yéil x’us.eetí Raven Footprints -- táakw winter -- King Fisher -- Bear -- A Dandelion by its own Name -- Migrations -- Untitled -- They Named Her Driftwood -- Kissing in the Rain -- Waltz of the Flowers: Anna and Company -- Sun Catcher -- Porcelain Curtains -- The River -- Kathleen Lake -- A Living Tapestry -- Red Cedar Tlingit Haida Weave -- Skinned -- Survivor -- Auke Lake Lights -- Aurora Chasers -- Emma Afloat -- I Can’t Sleep -- The Ghost I’m Left With -- Framed Memories -- Tequila, Sweat, and Prayers -- The Alchemical Marriage -- A New New Hope -- each dream practice -- Clouds -- Seasons Change and the Waters Run On -- John Muir -- Salmon Speaks -- A Place That Holds Names -- Untitled -- Salmon Spirit Chest, Connected (box) -- The Language of Weaving: Featured Artist Dr. Teri Rofkar -- Nome, Alaska -- Drained -- I’m From -- Srevlla—The state of things where the spring snow is so soft that one sinks into it. -- Reflections -- Txamsem -- Post-Glacial Rebound -- Dressed in Garlands -- Learning the Dance -- Shamrocks -- When You See Me -- Water Spirit -- To Speak for Restraint, for Wildness, for Beauty: Featured Writer Aleria Jensen -- Young Eagle -- Untitled (detail) -- Baula -- Airport Dike Trail Evening -- Ninja Meatballs -- Untitled -- In the Wild Without Child: One Mother’s Invitation to Self -- Whale Tail Vista -- Questions for Anemones -- Yellow Cedarbark Wool on Starfish Pot -- Gleaming Orange and Pissed -- Through the Sky She Comes -- Love for the Honeybee -- The Last Speaker -- Juneau Fireweed -- Judy Plays the Tuba -- Illuminated Juneau -- Airport Dike Trail Moonlight -- Escape -- A Wooden Mother -- Black and Whites -- an excuse for staying indoors (a working title for a work in progress) -- Insecurities -- Lake Farm -- Yew Bear -- Rupture -- Mendenhall Glacier -- The Rookery -- Transient -- Laminaria -- Untitled -- Querencia -- Hoard -- Untitled -- Small Birds Sign -- Selfie at Two -- Entropy -- Goodbye -- Sitka Bridge -- My Remedy -- S1 -- Delta Symbols Static -- Falling -- Breathe Deeply -- Drum, drum away -- Eaglefest Dancer -- Wasichana -- Writer & Artist Biographie

Probing multiple-frequency atom-photon interactions with ultracold atoms

We dress atoms with multiple-radiofrequency fields and investigate the spectrum of transitions driven by an additional probe field. A complete theoretical description of this rich spectrum is presented, in which we find allowed transitions and determine their amplitudes using the resolvent formalism. Experimentally, we observe transitions up to sixth order in the probe field using radiofrequency spectroscopy of Bose-Einstein condensates trapped in single- and multiple-radiofrequency-dressed potentials. We find excellent agreement between theory and experiment, including the prediction and verification of previously unobserved transitions, even in the single-radiofrequency case.Comment: 20 pages, 7 figure

Novel Lipophilic Probe for Detecting Near-Membrane Reactive Oxygen Species Responses and Its Application for Studies of Pancreatic Acinar Cells: Effects of Pyocyanin and L-Ornithine

Aims: The aim of this study was to develop a fluorescent reactive oxygen species (ROS) probe, which is preferentially localized in cellular membranes and displays a strong change in fluorescence upon oxidation. We also aimed to test the performance of this probe for detecting pathophysiologically relevant ROS responses in isolated cells. Results: We introduced a novel lipophilic ROS probe dihydrorhodamine B octadecyl ester (H2RB-C18). We then applied the new probe to characterize the ROS changes triggered by inducers of acute pancreatitis in pancreatic acinar cells. We resolved ROS changes produced by L-ornithine, L-arginine, cholecystokinin-8, acetylcholine, taurolithocholic acid 3-sulfate, palmitoleic acid ethyl ester, and the bacterial toxin pyocyanin. Particularly prominent ROS responses were induced by pyocyanin and L-ornithine. These ROS responses were accompanied by changes in cytosolic Ca2+concentration ([Ca2+]i), mitochondrial membrane potential (ΔΨ), and NAD(P)H concentration. Innovation: The study describes a novel sensitive lipophilic ROS probe. The probe is particularly suitable for detecting ROS in near-membrane regions and therefore for reporting the ROS environment of plasma membrane channels and pumps. Conclusions: In our experimental conditions, the novel probe was more sensitive than 5-(and-6)-chloromethyl-2′,7′-dichlorodihydrofluorescein (CM-H2DCF) and dihydrorhodamine123 (H2R123) and allowed us to resolve ROS responses to secretagogues, pyocyanin, and L-ornithine. Changes in the fluorescence of the new probe were particularly prominent in the peripheral plasma membrane-associated regions. Our findings suggest that the new probe will be a useful tool in studies of the contribution of ROS to the pathophysiology of exocrine pancreas and other organs/tissues

A point particle model of lightly bound skyrmions

A simple model of the dynamics of lightly bound skyrmions is developed in which skyrmions are replaced by point particles, each carrying an internal orientation. The model accounts well for the static energy minimizers of baryon number 1≤B≤8 obtained by numerical simulation of the full field theory. For 9≤B≤23, a large number of static solutions of the point particle model are found, all closely resembling size B subsets of a face centred cubic lattice, with the particle orientations dictated by a simple colouring rule. Rigid body quantization of these solutions is performed, and the spin and isospin of the corresponding ground states extracted. As part of the quantization scheme, an algorithm to compute the symmetry group of an oriented point cloud, and to determine its corresponding Finkelstein-Rubinstein constraints, is devised