cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Co-Designed Architectures for Modular Superconducting Quantum Computers
Creators: name: McKinney, Evan
name: Xia, Mingkang
name: Zhou, Chao
name: Lu, Pinlei
name: Hatridge, Michael
name: Jones, Alex K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Noisy, Intermediate Scale Quantum (NISQ) computers have reached the point where they can show the potential for quantum advantage over classical computing. Unfortunately, NISQ machines introduce sufficient noise that even for moderate size quantum circuits the results can be unreliable. We propose a co-designed superconducting quantum computer using a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) modulator. The SNAIL modulator is designed by considering both the ideal fundamental qubit gate operation while maximizing the qubit coupling capabilities. First, the SNAIL natively implements $\sqrt[n]{\texttt{iSWAP}}$ gates realized through proportionally scaled pulse lengths. This naturally includes $\sqrt{\texttt{iSWAP}}$, which provides an advantage over $\texttt{CNOT}$ as a basis gate. Second, the SNAIL enables high-degree couplings that allow rich and highly parallel qubit connection topologies without suffering from frequency crowding. Building on our previously demonstrated SNAIL-based quantum state router we propose a quantum 4-ary tree and a hypercube inspired corral built from interconnected quantum modules. We compare their advantage in data movement based on necessary \texttt{SWAP} gates to the traditional lattice and heavy-hex lattice used in latest commercial quantum computers. We demonstrate the co-design advantage of our SNAIL-based machine with $\sqrt{\texttt{iSWAP}}$ basis gates and rich topologies against $\texttt{CNOT}$/heavy-hex and $\texttt{FSIM}$/lattice for 16-20 qubit and extrapolated designs circa 80 qubit architectures. We compare total circuit time and total gate count to understand fidelity for systems dominated by decoherence and control imperfections, respectively. Finally, we provide a gate duration sensitivity study on further decreasing the SNAIL pulse length to realize $\sqrt[n]{\texttt{iSWAP}}$ qubit systems to reduce decoherence times.
description: This paper has been accepted to appear in the IEEE Symposium on High Performance Computer Architecture (HPCA), 2023
Improving performance of heart rate time series classification by grouping subjects
Creators: name: Beekhuizen, Michael
name: Naseri, Arman
name: Tax, David
name: van der Bilt, Ivo
name: Reinders, Marcel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Unlike the more commonly analyzed ECG or PPG data for activity classification, heart rate time series data is less detailed, often noisier and can contain missing data points. Using the BigIdeasLab_STEP dataset, which includes heart rate time series annotated with specific tasks performed by individuals, we sought to determine if general classification was achievable. Our analyses showed that the accuracy is sensitive to the choice of window/stride size. Moreover, we found variable classification performances between subjects due to differences in the physical structure of their hearts. Various techniques were used to minimize this variability. First of all, normalization proved to be a crucial step and significantly improved the performance. Secondly, grouping subjects and performing classification inside a group helped to improve performance and decrease inter-subject variability. Finally, we show that including handcrafted features as input to a deep learning (DL) network improves the classification performance further. Together, these findings indicate that heart rate time series can be utilized for classification tasks like predicting activity. However, normalization or grouping techniques need to be chosen carefully to minimize the issue of subject variability.
Cryptic species of the Myrmica tibetana complex (Hymenoptera: Formicidae) revealed by integrative taxonomy
Creators: name: Seifert, Bernhard
name: Schultz, Roland
name: Ritz, Markus S.
name: Ritz, Christiane M.
Publisher: name: The Austrian Society of Entomofaunistics
Year: 2018

description: Three closely related species, Myrmica tibetana Mayr, 1889, M. bactriana Ruzsky, 1915 and M. gebaueri sp.n., are identified. They are restricted to the Tibetan Plateau and proposed to form the M. tibetana species complex. Myrmica tibetana and M. gebaueri sp.n. are truly cryptic: They showed considerable interspecific overlap in all of the tested 18 shape, pilosity, and sculpture characters and were not safely separable by simple visual inspection by a trained expert. However, all three entities are clearly demonstrated by Nest Centroid (NC) clustering of morphological data which agreed by 100% with the genetic classification based on 11 microsatellite markers. The clusters shown by hierarchical NC-Ward clustering and the partitioning algorithms NC-part.hclust and NC-part.kmeans were coincident in all of the 62 nest samples. A stepwise linear discrimiant analysis reducing the set to nine characters achieved a classification error of 0% in 178 investigated worker individuals. All three entities are partially sympatric, and the absence of phenotypically mixed nest samples rejects the hypothesis that they could represent an intraspecific polymorphism. The coincident classification of all three exploratory data analyses of morphology and nuDNA revealed a paraphyly of mtDNA between M. bactriana and M. gebaueri sp.n. adding another example to the multiple evidence on failures of mtDNA barcoding in biodiversity research. Yet, mtDNA data appeared adequate for rough assessment of divergence times. According to this, the separation of the M. tibetana complex from other members of the M. rubra group is estimated to have occurred approximately 7.5 Ma Before Present (BP), and the radiation within the M. tibetana complex started > 5 Ma BP. A taxonomic description and a differential diagnosis of M. gebaueri sp.n. are presented. Myrmica bactriana Ruzsky, 1915 is shown as a senior synonym of M. furva Ruzsky, 1915 and M. ruzskyana Radchenko & Elmes, 2010. Synonymies of either member of the M. tibetana complex with the following Central and Middle Asian species are excluded: M. smythiesii Forel, 1902, M. fortior Forel, 1904, M. wittmeri Radchenko & Elmes, 1999, and M. tenuispina Ruzsky, 1905.
A new extinct ant genus (Hymenoptera: Formicidae: Myrmicinae) from the Late Eocene Rovno amber – a putative ancestor of the Leptothorax genus group
Creators: name: Radchenko, Alexander
name: Dlussky, Gennady M.
name: Perfilieva, Ksenia
Publisher: name: The Austrian Society of Entomofaunistics
Year: 2018

description: A new genus and a new species of ant, Proleptothorax primitivus, are described based on two males from the Late Eocene Rovno amber of Ukraine. This genus is characterized by the antennae 13-segmented, with the funiculus filiform without an apical club, by the very short antennal scape, by the short and narrow, bidentate mandibles, and by the forewing with cell 3r closed. We consider these features as obvious plesiomorphies compared with Leptothorax mayR, 1855, Formicoxenus mayR, 1855, and Harpagoxenus FoRel, 1893 and assume that Proleptothorax could be regarded as a putative ancestor of the extant genera of the Leptothorax genus group.
Movements (Chala) and Non movements (Achala)
Creators: name: S. Subbulakshmi
Publisher: name: gjrpublication
Year: 2024

description: "Chala" refers to a specific concept related to movement or progression. Chala and Achala are the Sanskrit terms which means movement and (stillness)non movement. The process of change, growth, and evolution can be considered for chala. On the other hand, stability, consistency, and the foundational aspects of systems are considered as Achala. Non movement or Stillness shows the periods of rest, introspection, and regeneration. The concepts of "chala" and "achala" interpreted in a cosmos reflects philosophical and metaphysical ideas. The dynamic processes and stable features of earth is the concepts of "chala" and "achala". The dynamic and stable aspects of Fire is the concepts of "chala" and "achala". The dynamic qualities and its stable states of Air are the concepts of "chala" and "achala. The dynamic processes and stable structures within the universe are the concepts of "chala" and "achala" The dynamic and stable aspects of plant life is the concepts of "chala" and "achala" in plant science. Various biological processes and behaviors in animals in animal science are the concepts of "chala" and "achala". The concepts of "chala" and "achala" are integral to understanding movement and stillness in Indian classical arts, particularly in music and dance. "chala" and "achala" work together to create a holistic experience in music and dance, blending movement with stillness to evoke a range of emotions and enhance artistic expression. Chala and achala are the balance and harmony. The relationship between movement and stillness is vital for balance.
The Structure of Isoperimetric Bubbles on $\mathbb{R}^n$ and $\mathbb{S}^n$
Creators: name: Milman, Emanuel
name: Neeman, Joe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Functional Analysis (math.FA)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: The multi-bubble isoperimetric conjecture in $n$-dimensional Euclidean and spherical spaces from the 1990's asserts that standard bubbles uniquely minimize total perimeter among all $q-1$ bubbles enclosing prescribed volume, for any $q \leq n+2$. The double-bubble conjecture on $\mathbb{R}^3$ was confirmed in 2000 by Hutchings-Morgan-Ritoré-Ros, and is nowadays fully resolved for all $n \geq 2$. The double-bubble conjecture on $\mathbb{S}^2$ and triple-bubble conjecture on $\mathbb{R}^2$ have also been resolved, but all other cases are in general open. We confirm the conjecture on $\mathbb{R}^n$ and on $\mathbb{S}^n$ for all $q \leq \min(5,n+1)$, namely: the double-bubble conjectures for $n \geq 2$, the triple-bubble conjectures for $n \geq 3$ and the quadruple-bubble conjectures for $n \geq 4$. In fact, we show that for all $q \leq n+1$, a minimizing cluster necessarily has spherical interfaces, and after stereographic projection to $\mathbb{S}^n$, its cells are obtained as the Voronoi cells of $q$ affine-functions, or equivalently, as the intersection with $\mathbb{S}^n$ of convex polyhedra in $\mathbb{R}^{n+1}$. Moreover, the cells (including the unbounded one) are necessarily connected and intersect a common hyperplane of symmetry, resolving a conjecture of Heppes. We also show for all $q \leq n+1$ that a minimizer with non-empty interfaces between all pairs of cells is necessarily a standard bubble. The proof makes crucial use of considering $\mathbb{R}^n$ and $\mathbb{S}^n$ in tandem and of Möbius geometry and conformal Killing fields; it does not rely on establishing a PDI for the isoperimetric profile as in the Gaussian setting, which seems out of reach in the present one.
description: 91 pages, 14 figures. Made some final corrections
Hints of Entanglement Suppression in Hyperon-Nucleon Scattering
Creators: name: Liu, Qiaofeng
name: Low, Ian
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Hyperon ($Y=Σ,Λ$)-nucleon ($N=n,p$) interactions are crucial for understanding the existence of neutron stars heavier than two solar masses. Amid renewed experimental efforts, we study $YN$ scatterings from the perspective of quantum information, focusing on whether spin entanglement is suppressed in the s-wave channel, which is observed in $np$ scattering and leads to enhanced global symmetries. Using global fits of phase shifts from experimental data, we find hints of entanglement suppression among the eight flavor channels in the strangeness $S=-1$ sector, similar to the $np$ case. One exception is the $Σ^+p$ channel, where conflicting global fits lead to inconclusive outcome. We then propose ''quantum'' observables in $Σ^+p$ scattering to help resolve the differing global fits.
description: 6 pages, 4 figures
Impact of dynamics, entanglement, and Markovian noise on the fidelity of few-qubit digital quantum simulation
Creators: name: Porter, Max D.
name: Joseph, Ilon
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Quantum algorithms have been proposed to accelerate the simulation of the chaotic dynamical systems that are ubiquitous in the physics of plasmas. Quantum computers without error correction might even use noise to their advantage to calculate the Lyapunov exponent by measuring the Loschmidt echo fidelity decay rate. For the first time, digital Hamiltonian simulations of the quantum sawtooth map, performed on the {IBM-Q} quantum hardware platform, show that the fidelity decay rate of a digital quantum simulation increases during the transition from dynamical localization to chaotic diffusion in the map. The observed error per \code{CNOT} gate increases by $1.5\times$ as the dynamics varies from localized to diffusive, while only changing the phases of virtual \code{RZ} gates and keeping the over-all gate count constant. A gate-based Lindblad noise model that captures the effective change in relaxation and dephasing errors during gate operation qualitatively explains the effect of dynamics on fidelity as being due to the localization and entanglement of the states created. Specifically, highly delocalized states that are entangled with random phases show an increased sensitivity to dephasing and, on average, a similar sensitivity to relaxation as localized states. In contrast, delocalized unentangled states show an increased sensitivity to dephasing but a lower sensitivity to relaxation. This gate-based Lindblad model is shown to be a useful benchmarking tool by estimating the effective Lindblad coherence times during \code{CNOT} gates and finding a consistent $2\text{--}3\times$ shorter $T_2$ time than reported for idle qubits. Thus, the interplay of the dynamics of a simulation with the noise processes that are active can strongly influence the overall fidelity decay rate.
description: 44 pages, 11 figures
Intrinsic Grain Boundary Shear Coupling Tensor
Creators: name: Song, Xinyuan
name: Yang, Liang
name: Deng, Chuang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Grain boundary (GB) migration stands as a linchpin process governing microstructural evolution in polycrystalline materials. Over the past decade, the concept of shear coupling, quantified through the shear coupling factor, has transformed our understanding and driven the development of theoretical frameworks for unifying GB behaviors. In this study, we introduced a novel concept of shear coupling strength designed to overcome the limitations of the conventional shear coupling factor, notably its deficiency in conveying "coupling" information. The shear coupling tensor formed by the shear coupling strengths characterizes intrinsic shear coupling properties across diverse GBs and reveals complex dynamics within the GB mobility tensor. The molecular dynamics simulation confirms the symmetry of the GB mobility tensor. This symmetry is inherently built into the shear coupling strength, aligning with an assumption made in previous studies. Additionally, an efficient methodology has been developed for streamlined extraction of both shear coupling and GB mobility tensors from atomistic simulations. This advancement holds the potential to sample GB behavior across extensive datasets, significantly enhancing our ability to predict structure-property relationships within the expansive 5-parameter space of GBs.
Fingerprints of Composite Fermion Lambda Levels in Scanning Tunneling Microscopy
Creators: name: Pu, Songyang
name: Balram, Ajit C.
name: Hu, Yuwen
name: Tsui, Yen-Chen
name: He, Minhao
name: Regnault, Nicolas
name: Zaletel, Michael P.
name: Yazdani, Ali
name: Papić, Zlatko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Composite fermion (CF) is a topological quasiparticle that emerges from a non-perturbative attachment of vortices to electrons in strongly correlated two-dimensional materials. Similar to non-interacting fermions that form Landau levels in a magnetic field, CFs can fill analogous ``Lambda'' levels, giving rise to the fractional quantum Hall (FQH) effect of electrons. Here, we show that Lambda levels can be directly visualized through the characteristic peak structure in the signal obtained via spectroscopy with the scanning tunneling microscopy (STM) on a FQH state. Complementary to transport, which probes low-energy properties of CFs, we show that \emph{high-energy} features in STM spectra can be interpreted in terms of Lambda levels. We numerically demonstrate that STM spectra can be accurately modeled using Jain's CF theory. Our results show that STM provides a powerful tool for revealing the anatomy of FQH states and identifying physics beyond the non-interacting CF paradigm.
description: Seven figures including supplementary materials
The Future Circular Collider (FCC) project and its cryogenic challenges
Creators: name: Tavian, Laurent
Publisher: name: Karlsruhe
Year: 2017

description: Following the update of the European strategy in particle physics, CERN has undertaken an international study of possible future circular colliders beyond the LHC. The study considers several options for very high-energy hadron-hadron, electron-positron and hadron-electron colliders. From the cryogenics point of view, the most challenging option is the hadron-hadron collider (FCC-hh). The FCC-hh cryogenic system will have to produce up to 120 kW at 1.8 K for the superconducting magnet cooling, 6 MW between 40 and 60 K for the beam-screen and thermal-shield cooling as well as 850 g/s between 40 and 290 K for the HTS current-lead cooling. The corresponding total entropic load represents about 1 MW equivalent at 4.5 K and this cryogenic system will be by far the largest ever designed. In addition, the total mass to be cooled down is about 250’000 t and an innovative cool-down process must be proposed. This talk will present the proposed cryogenic layout and architecture, the cooling principles of the main components, the corresponding cooling schemes, as well as the cryogenic plant arrangement and proposed process cycles with emphasis to the main cryogenic challenges.
Analytical Critical Phenomena of Rotating Regular AdS Black Holes with Dark Energy
Creators: name: Laassiri, Hayat.
name: Daassou, Ahmed.
name: Benbrik, Rachid.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This study focuses on precisely calculating analytical critical points for rotating regular AdS black holes, examining scenarios with and without external dark field contributions. Importantly, it represents the first attempt to compute critical points for this specific class of rotating black holes. Our primary focus is on investigating the impact resulting from variations in the charge of nonlinear electrodynamics on the critical phenomena of rotating regular AdS black holes, while also incorporating the influence of quintessence field contributions. The analytical investigation is concentrated on the horizon radius, employing two distinct approaches to simplify the complexity and length of the calculations. Furthermore, our examination extends to deciphering the intricate relationship between dark energy and critical phenomena. This involves visually portraying a range of critical behaviors and detailing a recent discovery regarding how the intensity of quintessence affects phase transitions. The shift in these transitions conform to either a concave or convex function, a characteristic dependent on the sign of quintessence intensity.
description: 19 pages, 6 figures, 2 Tables. Accepted for publication in International Journal of Modern Physics A (2024)
Smooth imploding solutions for 3D compressible fluids
Creators: name: Buckmaster, Tristan
name: Cao-Labora, Gonzalo
name: Gómez-Serrano, Javier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Building upon the pioneering work [Merle, Raphaël, Rodnianski, and Szeftel, Ann. of Math., 196(2):567-778, 2022, Ann. of Math., 196(2):779-889, 2022, Invent. Math., 227(1):247-413, 2022] we construct exact, smooth self-similar imploding solutions to the 3D isentropic compressible Euler equations for ideal gases for all adiabatic exponents $γ>1$. For the particular case $γ=\frac75$ (corresponding to a diatomic gas, e.g. oxygen, hydrogen, nitrogen), akin to the previous result, we show the existence of a sequence of smooth, self-similar imploding solutions. In addition, we provide simplified proofs of linear stability and non-linear stability, which allow us to construct asymptotically self-similar imploding solutions to the compressible Navier-Stokes equations with density independent viscosity for the case $γ=\frac75$. Moreover, the solutions constructed have density bounded away from zero and converge to a constant at infinity, representing the first example of singularity formation in such a setting.
description: 145 pages, 5 figures, 1 table, 16500 lines of code
Boundary-induced phase in epitaxial iron layers
Creators: name: Ravensburg, Anna L.
name: Werwiński, Mirosław
name: Rychły-Gruszecka, Justyna
name: Snarski-Adamski, Justyn
name: Elsukova, Anna
name: Persson, Per O. Å.
name: Rusz, Ján
name: Brucas, Rimantas
name: Hjövarsson, Björgvin
name: Svedlindh, Peter
name: Pálsson, Gunnar K.
name: Kapaklis, Vassilios
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report the discovery of a boundary-induced body-centered tetragonal (bct) iron phase in thin films deposited on MgAl$_{2}$O$_{4}$ ($001$) substrates. We present evidence for this phase using detailed x-ray analysis and ab-initio density functional theory calculations. A lower magnetic moment and a rotation of the easy magnetisation direction are observed, as compared to body-centered cubic (bcc) iron. Our findings expand the range of known crystal and magnetic phases of iron, providing valuable insights for the development of heterostructure devices using ultra-thin iron layers.
description: Main text: 4 pages, 3 figures. Supplemental Material: 9 pages, 11 figures
Valve actuated by electric stepper motor-based linear drive
Creators: name: Holdener, Fridolin
name: Hegglin, Andres
Publisher: name: Karlsruhe
Year: 2017

description: Actual cryogenic valves are mostly driven by pneumatic actuators. PLC generated electrical analogue or digital signals are guiding control valves via an electro-pneumatic positioner and shut-off valves by switching an electromagnetic pneumatic pilot valve. However, a pneumatic air supply system is complicated and the complexity increases with the number of valves and the geographical expansion. Furthermore, a pneumatic air supply system has a very low energy efficiency, needs continuous servicing and requires space. Thus, operation and capital costs for an electro-pneumatic system to actuate valves are high. There are new developments in in the refrigeration, natural gas and energy industries which use pneumatic free electric driven control and shut-off valves. Based on the positive service experiences, innovative cryogenic and warm valves, actuated by an electric stepper motor-based linear actuator were developed. The development includes also the electronic control module with specific algorithms for the full valve functionality. Valve safety function fail open or fail closed as well as many further control advantages are available. Using of electric stepper motor-based linear actuators for cryogenic and warm valves allows a highly-simplified installation for cryogenic systems. These advantages open a high potential to reduce operation and capital costs remarkably. Examples of such valves will be shown and described. Development perspectives will be discussed.
Applicability of Hydrodynamics in Hadronic Phase of Heavy-Ion Collisions
Creators: name: Scaria, Ronald
name: Singh, Captain R.
name: Sahoo, Raghunath
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The hadronic phase and its dynamics in relativistic heavy-ion collisions are topics of immense discussion. The hadronic phase contains various massive hadrons with an abundance of the lightest hadron, i.e., $π$-mesons (pions). In this paper, we consider that pions are in thermal equilibrium in the hadronic phase and use second-order viscous hydrodynamics for a medium of massive pions to obtain its expansion to the boundary of the kinetic freeze-out. We achieve the kinetic freeze-out boundary with the Knudsen number $Kn>1$ limit. When this condition is met, hydrodynamics expansion breaks down, and the mean free path becomes sufficiently large in comparison with the system size so that the particle yields are preserved. Further, we investigate the effect of the massive fluid on the resonance particle yields, including re-scattering and regeneration, along with the natural decay widths of the resonances. The resonances can play an essential role in determining the characteristics of the hadronic phase as they have sufficiently small lifetimes, which may be comparable to the hadronic phase lifetime. In the current study, we predict the hadronic phase lifetime, which is further used to determine the $K^*(892)^0/K$, $ϕ(1020)/K$, and $ρ(770)^0/π$ yield ratios at the kinetic freeze-out. We calculate these ratios as a function of charged particle multiplicity and transverse momentum and compare the findings with experimental data. Our calculations qualitatively agree with the experimental data, indicating a possible hydrodynamical evolution of the hadronic phase.
description: 13 pages and 6 captioned figures. Same as the published version
Alternating Bias Assisted Annealing of Amorphous Oxide Tunnel Junctions
Creators: name: Pappas, David P.
name: Field, Mark
name: Kopas, Cameron
name: Howard, Joel A.
name: Wang, Xiqiao
name: Lachman, Ella
name: Zhou, Lin
name: Oh, Jinsu
name: Yadavalli, Kameshwar
name: Sete, Eyob A.
name: Bestwick, Andrew
name: Kramer, Matthew J.
name: Mutus, Joshua Y.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate a transformational technique for controllably tuning the electrical properties of fabricated thermally oxidized amorphous aluminum-oxide tunnel junctions. Using conventional test equipment to apply an alternating bias to a heated tunnel barrier, giant increases in the room temperature resistance, greater than 70%, can be achieved. The rate of resistance change is shown to be strongly temperature-dependent, and is independent of junction size in the sub-micron regime. In order to measure their tunneling properties at mK temperatures, we characterized transmon qubit junctions treated with this alternating-bias assisted annealing (ABAA) technique. The measured frequencies follow the Ambegaokar-Baratoff relation between the shifted resistance and critical current. Further, these studies show a reduction of junction-contributed loss on the order of $\approx 2 \times10^{-6}$, along with a significant reduction in resonant- and off-resonant-two level system defects when compared to untreated samples. Imaging with high-resolution TEM shows that the barrier is still predominantly amorphous with a more uniform distribution of aluminum coordination across the barrier relative to untreated junctions. This new approach is expected to be widely applicable to a broad range of devices that rely on amorphous aluminum oxide, as well as the many other metal-insulator-metal structures used in modern electronics.
A Photographic Guide Of The Species Of The Gorringe Bank
Creators: name: Oliveira, Federico
name: Aguilar, Ricardo
name: Monteiro, Pedro
name: Bentes, Luis
name: Afonso, Carlos M. L.
name: García, Silvia
name: Xavier, Joana X.
name: Ocaña, Oscar
name: de Matos, Valentina
name: Tavares, Ana Mafalda
name: Gonçalves, Jorge M. S.
Publisher: name: Zenodo
Year: 2017
Subjects: seamount
Gorringe Bank
photographic guide
Atlantic Ocean
European Union (EU)
Horizon 2020
Grant Agreement No 679849
Deep-sea Sponge Grounds Ecosystems of the North Atlantic: an integrated approach towards their preservation and sustainable exploitation
SponGES

description: This is the digital version of the Photographic guide of the species of the Gorringe Bank, a publication about the marine species of the Gettysburg and Ormonde seamounts in the Gorringe Bank.

This photographic guide, presented by CCMAR and made in partnership with OCEANA, resulted from 2 expeditions to the Gorringe Bank. Located at about 125 nautical miles SW off the Cape of Saint Vincent (Sagres) and rising from 5,000 to 25m deep, Gorringe Bank is one of the largest underwater seamounts in Portuguese waters. Containing ROV images of 279 species of fauna and flora, this guide documents the life of this unique ecosystem and aims to assist in identifying the species of other Atlantic and Mediterranean seamounts.

This work was supported by taxonomists from several European research institutions such as H2020 project SponGES and Museo del Mar (Ceuta – Spain) and was mainly funded by CCMAR, OCEANA and by the EEA Grants / DGPM through the BIOMETORE project.
description: Media: Images collected in this guide are property of Oceana unless cited otherwise.

Acknowledgments: F. Oliveira was supported by a grant from project BIOMETORE funded by Direcao-Geral de Política do Mar and EEA grants. We further thank Jean Vacelet, Christine Morrow, Paco Cárdenas, Hans Tore Rapp, Francisca Carvalho and Alexander Plotkin for useful comments and discussions regarding sponge identifications, Andreia Braga henriques for the comments on the Cnidarians, Rui Coelho for the comments on Elasmobranchs and Mercedes Gonzáles Wangüemert for the comments on Echinoderms.

The SponGES project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No 679849.

Funding: This guide was co-funded by Oceana, Project BIOMETORE, Direcao-Geral de Politica do Mar, EEA Grants
Microgrid-Topologien Für Smart Grids
Creators: name: Klappert Eric
Publisher: name: Zenodo
Year: 2018

description: Meine Bachelorarbeit "Microgrid-Topologien für Smart Grids" sowie der zugehörige Code und die Quelldateien für die Thesis.

Zusammenfassung:

In Zeiten des Umstiegs auf erneuerbare Energien und dem Einsatz von Smart Metern zum

Messen und Steuern des Netzes stellen sich neue Herausforderungen für die Stromversor-

gung. Um die Kommunikation des Smart Grids zu ermöglichen wird vorgeschlagen das

Netzwerk in Microgrids zu unterteilen. Dies ermöglicht eine Absicherung der Einrichtun-

gen, insbesondere der Kritischen Infrastrukturen vor Ausfällen. Dazu wird eine sinnvolle

Aufteilung und eine robuste Kommunikationstopologie benötigt. In dieser Arbeit werden

die Anforderungen einer solchen Aufteilung und Topologie erarbeitet und verschiedene

Lösungsansätze vorgeschlagen und verglichen. Basierend auf den Ergebnissen wird ein

anpassungsfähiger Algorithmus entworfen, der ein Stromnetz in mehrere Microgrids

zerlegt und eine Kommunikationstopologie erzeugt.
title: Theater_Freiheit_Revolution?
Creators: name: Lamprecht, Gerald
Year: 2011

description: Wien genießt den Ruf einer Theaterstadt ersten Ranges. Jahr für Jahr ziehen etwa Burgtheater und Wiener Festwochen ein internationales Publikum an. Am Burgtheater spielen die „jungen Wilden“ von gestern und manchmal auch von heute, die Grenzen zwischen einer Kultur von „Unten“ und einer Kultur von „Oben“ scheinen fließender geworden zu sein. Aber wer waren die Personen, die einst angetreten sind, um gegen die verkrusteten Wiener Staatstheaterstrukturen zu rebellieren? Was waren ihre Ideale und wie ging die Stadt Wien mit ihnen um? In Wien wie anderswo ging es jungen KünstlerInnen der 60iger und 70iger Jahre unter dem Eindruck von Vietnamkrieg und im Bewusstsein, einer Tätergeneration zu entstammen, darum, die Welt zu verändern. So steht auch die Herausbildung einer „freien“ Theaterszene in Wien in einem engen Wechselspiel mit dem, was als „neue“ soziale Bewegungen bezeichnet wird. Dem Aufbegehren der 60er und 70er Jahre folgte bald die Ernüchterung. Die Vision einer herrschaftsfreien Gesellschaft erwies sich als Utopie und so begann der „Marsch durch die Institutionen“. Oder aber, wie im Fall Wien, die Institution nahm sich der „Revoluzzer“ an, stellte ihnen Räume und Gelder zur Verfügung und hielt sie damit im Zaum. Gleichzeitig öffnete sich etwa das Burgtheater, vor allem unter Peymann, den alternativen Zugängen zum Theatermachen, was damals von Presse und Publikum in Österreich als skandalös wahrgenommen wurde. Kann seither noch seriöserweise von „freiem“ Theater gesprochen werden? Und gibt es noch so etwas wie „soziale Bewegungen“? In den 90er Jahren, vor allem im Kontext der „alter-globalistischen“ Bewegungen, beginnt die „freie“ Theaterszene sich wieder – zumindest in Ansätzen - ihrer (politischen) Wurzeln bewusst zu werden. Kampffelder gibt es genug: prekäre Anstellungsverhältnisse, ein tendenziell rassistischer Grundtenor, Institutionen der Macht, den persönliche Interessen zunehmend untergeordnet werden müssen. Diese Arbeit zeigt die Entwicklung einer „freien“ Theaterszene von den Nachkriegsjahren bis zur Theaterreform 2003, und sucht dabei die Kontinuitäten und Diskontinuitäten der Dissidenz, der Autonomie und der Anpassung im “freien“ Theater.
Two-dimensional coherent spectroscopy of trion-polaritons and exciton-polaritons in atomically thin transition metal dichalcogenides
Creators: name: Hu, Hui
name: Wang, Jia
name: Lalor, Riley
name: Liu, Xia-Ji
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a microscopic many-body calculation of the nonlinear two-dimensional coherent spectroscopy (2DCS) of trion-polaritons and exciton-polaritons in charge-tunable transition-metal-dichalcogenides monolayers placed in an optical microcavity. The charge tunability leads to an electron gas with nonzero density that brings brightness to the trion - a polaron quasiparticle formed by an exciton with a nonzero residue bounded to the electron gas. As a result, a trion-polariton is created under strong light-matter coupling, as observed in the recent experiment by Sidler \textit{et al.} {[}Nat. Phys. \textbf{13}, 255 (2017){]}. We analyze in detail the structure of trion-polaritons, by solving an extended Chevy ansatz for the trion quasiparticle wave-function. We confirm that the effective light-matter coupling for trion-polaritons is determined by the residue of the trion quasiparticle. The solution of the full many-body polaron states within Chevy ansatz enables us to microscopically calculate the nonlinear 2DCS spectrum of both trion-polaritons and exciton-polaritons. We predict the existence of three kinds of off-diagonal cross-peaks in the 2DCS spectrum, as an indication of the coherence among the different branches of trion-polaritons and exciton-polaritons. Due to the sensitivity of 2DCS spectrum to quasiparticle interactions, our work provides a good starting point to explore the strong nonlinearity exhibited by trion-polaritons in some recent exciton-polariton experiments.
description: 13 pages, 9 figures
Phase-stabilised self-injection-locked microcomb
Creators: name: Wildi, Thibault
name: Ulanov, Alexander E.
name: Voumard, Thibault
name: Ruhnke, Bastian
name: Herr, Tobias
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Microresonator frequency combs (microcombs) hold great potential for precision metrology within a compact form factor, impacting a wide range of applications such as point-of-care diagnostics, environmental monitoring, time-keeping, navigation and astronomy. Through the principle of self-injection locking, electrically-driven chip-based microcombs with minimal complexity are now feasible. However, phase-stabilisation of such self-injection-locked microcombs, a prerequisite for metrological frequency comb, has not yet been attained. Here, we address this critical need by demonstrating full phase-stabilisation of a self-injection-locked microcomb. The microresonator is implemented in a silicon nitride photonic chip, and by controlling a pump laser diode and a microheater with low voltage signals (less than 1.5 V), we achieve independent control of the comb's offset and repetition rate frequencies. Both actuators reach a bandwidth of over 100 kHz, enabling phase-locking of the microcomb to external frequency references. These results establish photonic chip-based, self-injection-locked microcombs as low-complexity yet versatile sources for coherent precision metrology in emerging applications.
description: 12 pages, 7 figures
Time-Varying Multi-Objective Optimization: Tradeoff Regret Bounds
Creators: name: Shafiei, Allahkaram
name: Marecek, Jakub
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Multi-objective optimization studies the process of seeking multiple competing desiderata in some operation. Solution techniques highlight marginal tradeoffs associated with weighing one objective over others. In this paper, we consider time-varying multi-objective optimization, in which the objectives are parametrized by a continuously varying parameter and a prescribed computational budget is available at each time instant to algorithmically adjust the decision variables to accommodate for the changes. We prove regret bounds indicating the relative guarantees on performance for the competing objectives.
description: https://openreview.net/forum?id=dNdrYbxMMz
Generating random Gaussian states
Creators: name: Leppäjärvi, Leevi
name: Nechita, Ion
name: Sengupta, Ritabrata
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We develop a method for the random sampling of (multimode) Gaussian states in terms of their covariance matrix, which we refer to as a random quantum covariance matrix (RQCM). We analyze the distribution of marginals and demonstrate that the eigenvalues of an RQCM converge to a shifted semicircular distribution in the limit of a large number of modes. We provide insights into the entanglement of such states based on the positive partial transpose (PPT) criteria. Additionally, we show that the symplectic eigenvalues of an RQCM converge to a probability distribution that can be characterized using free probability. We present numerical estimates for the probability of a RQCM being separable and, if not, its extendibility degree, for various parameter values and mode bipartitions.
Sent
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1905
Subjects: Haus

description: Dargestellt werden die Chasa Rüedlinger, Bügliet (im Vordergrund) mit einem Sentergiebel und die Chasa Balser Schmidt, Curtinaglias in Sent
description: [Johann Rudolf Rahn]
description: Handschriftliche Notiz von Johann Rudolf Rahn "Balkeconfleur"
Sent
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1905
Subjects: Haus

description: Dargestellt wird ein Blick in eine Gasse in Sent. Die alten Häuser sind teilweise mit einem Sentergiebel versehen
description: [Johann Rudolf Rahn]
description: Handschriftliche Notizen von Johann Rudolf Rahn "1671" sowie mit Bleistift bei der Notierung des Datums "29"
Giraffaphaenops Deuve 2002
Creators: name: Ma, Zijun
name: Huang, Sunbin
name: Tian, Mingyi
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Giraffaphaenops

description: Key to species of the genus Giraffaphaenops Deuve, 2002
1 Head shorter and wider, reversed triangular................................................ G. brevicephalus n. sp.
- Head longer and thinner, column-like..................................................................... 2
2 Head thicker, temples slightly and gradually narrowed towards the neck constriction................ G. yangi Tian & Luo
- Head thinner, temples strongly narrowed and almost straight towards neck constriction................. G. clarkei Deuve
description: Published as part of Ma, Zijun, Huang, Sunbin & Tian, Mingyi, 2020, Two new species of cavernicolous trechines from central Guizhou and northwestern Guangxi, China (Coleoptera: Carabidae: Trechinae), pp. 581-593 in Zootaxa 4861 (4) on page 591, DOI: 10.11646/zootaxa.4861.4.6, http://zenodo.org/record/4416789
Ruine von St. Paolo in Sins Unterengadin
Creators: name: Hartmann, Nicolaus
Publisher: name: [s.n.]
Year: 1890
Subjects: Sent

description: Dargestellt werden eine Aussenansicht, ein Ausschnitt der Chormauern sowie ein Grundriss der Kirchenruine St. Peter in Sent
description: Nicolaus Hartmann St. Moritz
description: Der Architekt Nicolaus Hartmann (1838-1903) hat handschriftliche Notizen zu einzelnen Elementen hinzugefügt "[Rom: Basilica von ca 11t-12t Jahrhundert]", "Längsschnitt", "ca 15 mtr lang", "Thüre", "Grundriss in d. Fenstern" und "Auf[riss] der Chormauern"
A Framework for  Teaching  Undergraduate  Courses on Counseling  Psychology : Implications for Occupational and Educational Aspirations
Creators: name: Gasser, Courtney E.
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: Counceling Psychology
Pedagogy
Undergraduate

description: Consistent with the discipline, undergraduate courses about the field of counseling psychology (CP) should focus on the themes of counseling research, practice, and theory. Pedagogical suggestions for this framework are presented. Preliminary findings regarding the usefulness of this structure were highlighted through students’ post-course reports. Evidence suggested that students felt they learned about CP research, clinical practice, and theory within the course, and thought that what they learned was relevant to their careers and life. Pretest and posttest comparisons demonstrated that, though the students’ occupational aspirations did not significantly change, their educational aspirations decreased by the end of the course as hypothesized.
description: https://www.counseling.org/docs/default-source/vistas/a-framework-for-teaching-undergraduate-courses-on-counseling.pdf?sfvrsn=4
Solavers
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1892

description: Dargestellt werden verschiedene Elemente des Grundrisses der Burgruine Solavers in Seewis, am Anfang des Prättigaus
description: [Johann Rudolf Rahn]
description: Johann Rudolf Rahn hat handschriftlich notiert "Obere Ringmauer", "untere Ringmauer" und "aus Johann Myears Msc i Besitz des Herrn Oberst A. Theophil Sprecher in Mayenfeld"
Perspectives on Corruption: He Who Pays the Piper
Creators: name: Wyatt-Nichol, Heather
name: Gibson, Ed
Publisher: name: Maryland Shared Open Access Repository
Year: 0
Subjects: corruption
african countries
decentralization
anti-corruption initiatives

description: Corruption is historical and global, existing in every society regardless of time and place. However, the extent and impact of corruption range from various acts of transgression in some societies to being deeply imbedded in the institutions of others. The consequences of corruption also vary from a mere loss of money for a few individuals to the loss of lives for entire groups of people. This chapter examines perceptions of corruption across various countries in Africa, taking into account the hegemonic discourse of Western nations, and offers contrasting instances of corrupt acts in U.S. municipalities.
Solavers
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1892

description: Dargestellt wird der Grundriss der Burgruine Solavers in Seewis, am Anfang des Prättigaus
description: [Johann Rudolf Rahn]
description: Johann Rudolf Rahn hat handschriftlich notiert "aus Johann Myears Msc i Besitz des Herrn Oberst A. Theophil Sprecher in Mayenfeld"
title: Die Qualität von LehrerInneneinschätzungen bei der Identifikation von hoher kognitiver Leistungsfähigkeit bei Kindern
Creators: name: Klockgether, Katharina
Year: 2011

description: Die vorliegende Studie beschäftigt sich mit der diagnostischen Kompetenz von österreichischen VolksschullehrerInnen sowie der Eignung von LehrerInnen-einschätzung, LehrerInnennomination und Peernomination (mit der Möglichkeit der Selbstnomination) zur Identifikation besonders leistungsfähiger Kinder im mathematischen und sprachlichen Bereich. Zu diesem Zwecke wurden 219 SchülerInnen aus elf Klassen in Niederösterreich mit einem standardisierten Intelligenztestverfahren untersucht. Die jeweiligen KlassenlehrerInnen schätzten die Leistungsfähigkeit aller Kinder anhand des Einschätzungsverfahrens ein. Zusätzlich nahmen die Lehrkräfte und die SchülerInnen eine Nomination vor, in welcher sie die jeweils im mathematischen und sprachlichen Bereich besten SchülerInnen nennen sollten. Der Vergleich der Intelligenztestwerte mit den LehrerInneneinschätzungen zeigte einen mittleren Zusammenhang. Außerdem konnte eine Überschätzung des Klassenniveaus und eine leichte Unterschätzung der Streuung der Leistungsfähigkeit innerhalb der Klassen festgestellt werden. Als geeignetstes Instrument zur Identifikation der besonders leistungsfähigen Kinder im mathematischen Bereich stellte sich von den angewendeten Verfahren die LehrerInneneinschätzung heraus. Im sprachlichen Bereich zeigte sich ein Vorteil der Peernomination. Durch eine Kombination verschiedener Methoden konnte eine Erhöhung der korrekt identifizierten besonders Leistungsfähigen erreicht werden. Es wird aufgrund der Ergebnisse dazu geraten, das Thema des Diagnostizierens mehr in die LehrerInnenausbildung zu integrieren.
Workplace Flexibility in Higher Education: Reflections on the National Challenge for Higher Education Conference
Creators: name: Wyatt-Nichol, Heather
Publisher: name: Maryland Shared Open Access Repository
Year: 2015
Subjects: workplace flexibility
higher education
institutional support
women in higher education
female professors

description: The American Council on Education and Alfred P. Sloan Foundation recently hosted the National Challenge for Higher Education Conference, in Washington, D.C. Among the impressive list of speakers was our own USM chancellor, Dr. Kirwan. His presence and remarks demonstrated institutional support at the highest level. Dr. Laura Koppes Brian, Dean of the College of Liberal Arts at the University of Baltimore was also a speaker at the conference. The conference was divided by keynote speakers with a variety of parallel sessions throughout the day, and active audience participation. Work- place flexibility was the common theme and numerous sub-topics were addressed.