cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Baryon Spectroscopy - Recent Results from the CBELSA/TAPS Experiment
Creators: name: Hartmann, Jan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: One of the remaining challenges within the standard model is to gain a good understanding of QCD in the non-perturbative regime. One key step toward this aim is baryon spectroscopy, investigating the spectrum and the properties of baryon resonances. To get access to resonances with small $πN$ partial width, photoproduction experiments provide essential information. In order to extract the contributing resonances, partial wave analyses need to be performed. Here, a complete experiment is required to unambiguously determine the contributing amplitudes. This involves the measurement of carefully chosen single and double polarization observables. The CBELSA/TAPS experiment with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam allows the measurement of a large set of polarization observables. Due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage it is ideally suited for the measurement of photoproduction of neutral mesons decaying into photons. Recent results for various double polarization observables in $π^0$ and $η$ photoproduction and their impact on the partial wave analysis are discussed.
description: 6 pages, 4 figures, Proceedings of Hadron 2015 conference
Stateful Defenses for Machine Learning Models Are Not Yet Secure Against Black-box Attacks
Creators: name: Feng, Ryan
name: Hooda, Ashish
name: Mangaokar, Neal
name: Fawaz, Kassem
name: Jha, Somesh
name: Prakash, Atul
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recent work has proposed stateful defense models (SDMs) as a compelling strategy to defend against a black-box attacker who only has query access to the model, as is common for online machine learning platforms. Such stateful defenses aim to defend against black-box attacks by tracking the query history and detecting and rejecting queries that are "similar" and thus preventing black-box attacks from finding useful gradients and making progress towards finding adversarial attacks within a reasonable query budget. Recent SDMs (e.g., Blacklight and PIHA) have shown remarkable success in defending against state-of-the-art black-box attacks. In this paper, we show that SDMs are highly vulnerable to a new class of adaptive black-box attacks. We propose a novel adaptive black-box attack strategy called Oracle-guided Adaptive Rejection Sampling (OARS) that involves two stages: (1) use initial query patterns to infer key properties about an SDM's defense; and, (2) leverage those extracted properties to design subsequent query patterns to evade the SDM's defense while making progress towards finding adversarial inputs. OARS is broadly applicable as an enhancement to existing black-box attacks - we show how to apply the strategy to enhance six common black-box attacks to be more effective against current class of SDMs. For example, OARS-enhanced versions of black-box attacks improved attack success rate against recent stateful defenses from almost 0% to to almost 100% for multiple datasets within reasonable query budgets.
description: ACM CCS 2023
Phasen und Perioden, die für das Reifen des menschlichen Handelns und des Glaubensaktes nötig sind
Creators: name: Berger, W. J.
name: Lans, Jan Van Den
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 15 Nr. 2 (1979): Concilium: Internationale Zeitschrift für Theologie, Band 15, Heft 2
[C.3.18.b.] Tonio
Creators: name: Delmas, Georges (Dit Georges Isabelli)
Publisher: name: École des Hautes Études en Sciences Sociales; La Voix des Nôtres
Year: 2023
Subjects: http://www.idref.fr/027456625/id
http://www.idref.fr/034703926/id
http://www.idref.fr/027261468/id
http://www.idref.fr/028135350/id

Abstract
Mapping the outer bulge with RRab stars from the VVV Survey
Creators: name: Gran, F.
name: Minniti, D.
name: Saito, R. K.
name: Zoccali, M.
name: Gonzalez, O. A.
name: Navarrete, C.
name: Catelan, M.
name: Ramos, R. Contreras
name: Elorrieta, F.
name: Eyheramendy, S.
name: Jordán, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The VISTA Variables in the Vía Láctea (VVV) is a near-IR time-domain survey of the Galactic bulge and southern plane. One of the main goals of this survey is to reveal the 3D structure of the Milky Way through their variable stars. Particularly the RR Lyrae stars have been massively discovered in the inner regions of the bulge ($-8^\circ \lesssim b \lesssim -1^\circ$) by optical surveys such as OGLE and MACHO but leaving an unexplored window of more than $\sim 47$ sq deg ($-10.0^\circ \lesssim \ell \lesssim +10.7^\circ$ and $-10.3^\circ \lesssim b \lesssim -8.0^\circ$) observed by the VVV Survey. Our goal is to characterize the RR Lyrae stars in the outer bulge in terms of their periods, amplitudes, Fourier coefficients, and distances, in order to evaluate the 3D structure of the bulge in this area. The distance distribution of RR Lyrae stars will be compared to the one of red clump stars that is known to trace a X-shaped structure in order to determine if these two different stellar populations share the same Galactic distribution. We report the detection of more than 1000 RR Lyrae ab-type stars in the VVV Survey located in the outskirts of the Galactic bulge. Some of them are possibly associated with the Sagittarius Dwarf Spheroidal Galaxy. We calculated colors, reddening, extinction, and distances of the detected RR Lyrae stars in order to determine the outer bulge 3D structure. Our main result is that, at the low galactic latitudes mapped here, the RR Lyrae stars trace a centrally concentrated spheroidal distribution. This is a noticeably different spatial distribution to the one traced by red clump stars known to follow a bar and X-shape structure. We estimate the completeness of our RRab sample in $80\%$ for $K_{\rm s}\lesssim15$ mag.
description: 26 pages, 8 figures, accepted for publication in Astronomy and Astrophysics
Training variational quantum algorithms with random gate activation
Creators: name: Liu, Shuo
name: Zhang, Shi-Xin
name: Jian, Shao-Kai
name: Yao, Hong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Variational quantum algorithms (VQAs) hold great potentials for near-term applications and are promising to achieve quantum advantage on practical tasks. However, VQAs suffer from severe barren plateau problem as well as have a large probability of being trapped in local minima. In this Letter, we propose a novel training algorithm with random quantum gate activation for VQAs to efficiently address these two issues. This new algorithm processes effectively much fewer training parameters than the conventional plain optimization strategy, which efficiently mitigates barren plateaus with the same expressive capability. Additionally, by randomly adding two-qubit gates to the circuit ansatz, the optimization trajectories can escape from local minima and reach the global minimum more frequently due to more sources of randomness. In real quantum experiments, the new training algorithm can also reduce the quantum computational resources required and be more quantum noise resilient. We apply our training algorithm to solve variational quantum simulation problems for ground states and present convincing results that showcase the advantages of our novel strategy where better performance is achieved by the combination of mitigating barren plateaus, escaping from local minima, and reducing the effect of quantum noises. We further propose that the entanglement phase transition could be one underlying reason why our RA training is so effective.
description: 4.5 pages + references + supplemental, 4 figures
Qualité et sécurité des soins : une approche alternative
Creators: name: Laurent, Marius
Publisher: name: Health & Co
Year: 2022
Subjects: Culture sécurité
Sécurité du patient
Événement indésirable
Gestion du risque

description: La revue Risques & Qualité publiera progressivement sur son site, à compter de juillet 2022, une série de réflexions et de propositions de l’auteur, dont ce texte constitue l’introduction. Qu’il soit médecin, soignant, ingénieur ou administratif, gestionnaire des risques ou simplement curieux, le lecteur pourra ainsi approfondir ou découvrir les fondamentaux de la sécurité, des théories qui la sous-tendent aux méthodes les plus couramment appliquées, et réfléchir aux progrès possibles face à un univers hospitalier de plus en plus complexe, au sein d’une société qui tolère de moins en moins les mauvaises surprises.
Shubnikov-de Haas oscillations of high mobility holes in monolayer and bilayer WSe$_2$: Landau level degeneracy, effective mass, and negative compressibility
Creators: name: Fallahazad, Babak
name: Movva, Hema C. P.
name: Kim, Kyounghwan
name: Larentis, Stefano
name: Taniguchi, Takashi
name: Watanabe, Kenji
name: Banerjee, Sanjay K.
name: Tutuc, Emanuel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the magnetotransport properties of high mobility holes in monolayer and bilayer WSe$_2$, which display well defined Shubnikov-de Haas (SdH) oscillations, and quantum Hall states (QHSs) in high magnetic fields. In both mono and bilayer WSe$_2$, the SdH oscillations and the QHSs occur predominantly at even filling factors, evincing a two-fold Landau level degeneracy. The Fourier transform analysis of the SdH oscillations in bilayer WSe$_2$ reveal the presence of two subbands localized in the top or the bottom layer, as well as negative compressibility. From the temperature dependence of the SdH oscillations we determine a hole effective mass of $0.45m_{0}$ for both mono and bilayer WSe$_2$.
description: 5 pages, 4 figures
Использование двумерных фотонных кристаллов для спектроскопии в субтерагерцовом частотном диапазоне
Creators: name: Гусихин, П.А.
name: Фортунатов, А.А.
name: Муравьев, В.М.
name: Кукушкин, И.В.
Publisher: name: Институт физики твердого тела РАН
Year: 2020

description: Использование двумерных фотонных кристаллов для спектроскопии в субтерагерцовом частотном диапазоне П.А.Гусихин, А.А.Фортунатов, В.М.Муравьев, И.В.Кукушкин ИФТТ РАН, 142432, Московская обл., г. Черноголовка, ул. Академика Осипьяна, д.2 e-mail: gusikhinissp.ac.ru Двумерные фотонные кристаллы представляют собой двумерную структуру с периодически меняющейся в пространстве диэлектрической проницаемостью. Было показано, что в такой структуре могут существовать фотонные запрещённые зоны 1, а в резонаторе внутри фотонного кристалла резонаторная мода, лежащая внутри запрещённой зоны фотонного кристалла 2. Высокая достижимая добротность резонаторной модой и малый пространственный объём резонатора делают возможным построение спектроскопии на основе резонаторов в двумерных фотонных кристаллах. В данной работе в качестве чувствительного элемента использовался полупроводниковый детектор 3, преимущество которого состоит в том, что он может быть изготовлен в едином технологическом цикле с фотонным кристаллом непосредственно внутри микрорезонатора. Фотонный кристалл представлял собой треугольную решётку отверстий в подложке GaAs, а микрорезонатор несколько пропущенных отверстий в этой решётке. На рисунке 1 показаны спектры фотоотклика детекторов, помещённых в микрорезонаторы в фотонных кристаллах с различными периодами. На этих спектрах видны острые пики, соответствующие возбуждению резонаторных мод. Добротность резонаторов в данной работе превышала Q 200. Нами были исследованы фотонные кристаллы с различными решётками, периодами и конфигурациями микрорезонаторов. Работа выполнена в рамках госзадания ИФТТ РАН. Литература 1 M. Plihal, A. Shambrook, A.A. Maradudin, P. Sheng, Opt. Commun. 80, 199 (1991). 2 O. Painter, R.K. Lee, A. Scherer, A. Yariv, J.D. OBrien, P.D. Dapkus, I. Kim, Science 284,1819 (1999). 3 V.M. Muravev and I.V. Kukushkin, Appl. Phys. Lett. 100, 082102 (2012).
Complex knowledge graph embeddings based on convolution and translation
Creators: name: Lin-Shi
name: Yang, Zhao
name: Ji, Zhanlin
name: GANCHEV, IVAN
Publisher: name: University of Limerick
Year: 2023
Subjects: Information and computing sciences

description: Link prediction involves the use of entities and relations that already exist in a knowledge graph to reason about missing entities or relations. Different approaches have been proposed to date for performing this task. This paper proposes a combined use of the translation-based approach with the Convolutional Neural Network (CNN)-based approach, resulting in a novel model, called ConCMH. In the proposed model, first, entities and relations are embedded into the complex space, followed by a vector multiplication of entity embeddings and relational embeddings and taking the real part of the results to generate a feature matrix of their interaction. Next, a 2D convolution is used to extract features from this matrix and generate feature maps. Finally, the feature vectors are transformed into predicted entity embeddings by obtaining the inner product of the feature mapping and the entity embedding matrix. The proposed ConCMH model is compared against state-of-the-art models on the four most commonly used benchmark datasets and the obtained experimental results confirm its superiority in the majority of cases.
Акустооптические переключения поляризации экситон-поляритонной системы в полупроводниковых микрорезонаторах
Creators: name: Деменев, А.А.
Publisher: name: Институт физики твердого тела РАН
Year: 2020

description: Акустооптические переключения поляризации экситон-поляритонной системы в полупроводниковых микрорезонаторах А.А.Деменев ИФТТ РАН, 142432, Черноголовка, Московская обл., ул. Академика Осипьяна, д.2 e-mail: demenevissp.ac.ru Экситонные поляритоны возникают в полупроводниковых микрорезонаторах (МР) в режиме сильной экситон-фотонной связи. В работе 1 было показано, что поляризационным состоянием поляритонной системы можно управлять изменения частоту экситонного уровня акусто-деформационными импульсами. В результате при фиксированных интенсивности и поляризации накачки возможны контролируемые сверхбыстрые переключения между состояниями с линейной и циркулярной поляризациями поляритонной моды. В представленной работе экситон-поляритонный конденсат возбуждался резонансно по нормали к GaAs-МР 50-нс лазерными импульсами с ELP 140 мкэВ. Импульсы деформации (10 пс) формировались на поверхности GaAs-подложки при поглощении 200-фс лазерных импульсов и достигали КЯ в активном слое МР за 73.9 нс. При прохождении области с КЯ импульс деформации вызывал сдвиг уровня поляритона до 90 мкэВ и резкое (250 пс) возрастание в 12 раз пропускания МР в поляризации (переход -подсистемы на верхнюю ветвь S-кривой) (рис.1a). При этом, пропускание в - поляризации возрастало лишь в 1.5 раза, т.е. --подсистема оставалась на нижней ветви S-кривой (рис.1b). Следовательно, импульс деформации переключал поляризацию поляритонной моды с практически линейной (lin0.98, circ0.2) на циркулярную с circ0.85. Таким образом, в работе показано, что сверхкороткие обратимые изменения частоты экситонного уровня могут приводить к переключению поляризации поляритонной системы на пикосекундном масштабе времен. Работа выполнена в рамках госзадания ИФТТ РАН. Литература 1 S.S. Gavrilov, A.A. Demenev, V.D. Kulakovskii, JETP Letters, 100, 817 (2015).
The fastest generation of multipartite entanglement with natural interactions
Creators: name: Cieśliński, Paweł
name: Kłobus, Waldemar
name: Kurzyński, Paweł
name: Paterek, Tomasz
name: Laskowski, Wiesław
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Natural interactions among multiple quantum objects are fundamentally composed of two-body terms only. In contradistinction, single global unitaries that generate highly entangled states typically arise from Hamiltonians that couple multiple individual subsystems simultaneously. Here, we study the time to produce strongly nonclassical multipartite correlations with a single unitary generated by the natural interactions. We restrict the symmetry of two-body interactions to match the symmetry of the target states and focus on the fastest generation of multipartite entangled Greenberger-Horne-Zeilinger (GHZ), W, Dicke and absolutely maximally entangled (AME) states for up to seven qubits. These results are obtained by constraining the energy in the system and accordingly can be seen as state-dependent quantum speed limits for symmetry-adjusted natural interactions. They give rise to a counter-intuitive effect where the creation of particular entangled states with an increasing number of particles does not require more time. The methods used rely on extensive numerical simulations and analytical estimations.
description: journal version, 12 pages, 6 figures
Extreme Asymmetry in the Disk of V1247 Ori
Creators: name: Ohta, Yurina
name: Fukagawa, Misato
name: Sitko, Michael L.
name: Muto, Takayuki
name: Kraus, Stefan
name: Grady, Carol A.
name: Wisniewski, John P.
name: Swearingen, Jeremy R.
name: Shibai, Hiroshi
name: Sumi, Takahiro
name: Hashimoto, Jun
name: Kudo, Tomoyuki
name: Kusakabe, Nobuhiko
name: Momose, Munetake
name: Okamoto, Yoshiko
name: Kotani, Takayuki
name: Takami, Michihiro
name: Currie, Thayne
name: Thalmann, Christian
name: Janson, Markus
name: Akiyama, Eiji
name: Follette, Katherine B.
name: Mayama, Satoshi
name: Abe, Lyu
name: Brandner, Wolfgang
name: Brandt, Timothy D.
name: Carson, Joseph C.
name: Egner, Sebastian E.
name: Feldt, Markus
name: Goto, Miwa
name: Guyon, Olivier
name: Hayano, Yutaka
name: Hayashi, Masahiko
name: Hayashi, Saeko S.
name: Henning, Thomas
name: Hodapp, Klaus W.
name: Ishii, Miki
name: Iye, Masanori
name: Kandori, Ryo
name: Knapp, Gillian R.
name: Kuzuhara, Masayuki
name: Kwon, Jungmi
name: Matsuo, Taro
name: McElwain, Michael W.
name: Miyama, Shoken
name: Morino, Jun-Ichi
name: Moro-Martin, Amaya
name: Nishimura, Tetsuo
name: Pyo, Tae-Soo
name: Serabyn, Eugene
name: Suenaga, Takuya
name: Suto, Hiroshi
name: Suzuki, Ryuji
name: Takahashi, Yasuhiro H.
name: Takami, Hideki
name: Takato, Naruhisa
name: Terada, Hiroshi
name: Tomono, Daigo
name: Turner, Edwin L.
name: Usuda, Tomonori
name: Watanabe, Makoto
name: Yamada, Toru
name: Tamura, Motohide
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the first near-infrared scattered-light detection of the transitional disk around V1247 Ori, which was obtained using high-resolution polarimetric differential imaging observations with Subaru/HiCIAO. Our imaging in the H band reveals the disk morphology at separations of ~0.14"-0.86" (54-330 au) from the central star. The polarized intensity (PI) image shows a remarkable arc-like structure toward the southeast of the star, whereas the fainter northwest region does not exhibit any notable features. The shape of the arm is consistent with an arc of 0.28" $\pm$ 0.09" in radius (108 au from the star), although the possibility of a spiral arm with a small pitch angle cannot be excluded. V1247 Ori features an exceptionally large azimuthal contrast in scattered, polarized light; the radial peak of the southeastern arc is about three times brighter than the northwestern disk measured at the same distance from the star. Combined with the previous indication of an inhomogeneous density distribution in the gap at $\lesssim$46 au, the notable asymmetry in the outer disk suggests the presence of unseen companions and/or planet-forming processes ongoing in the arc.
description: 21 pages, 5 figures, accepted for publication in PASJ
Scaling of fronts and entanglement spreading during a domain wall melting
Creators: name: Scopa, Stefano
name: Karevski, Dragi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We revisit the out-of-equilibrium physics arising during the unitary evolution of a one-dimensional XXZ spin chain initially prepared in a domain wall state $\vertψ_0\rangle=\vert\dots \uparrow\uparrow\downarrow\downarrow\dots\rangle$. In absence of interactions, we review the exact lattice calculation of several conserved quantities, including e.g. the magnetization and the spin current profiles. At large distances $x$ and times $t$, we show how these quantities allow for a ballistic scaling behavior in terms of the scaling variable $ζ= x/t$, with exactly computable scaling functions. In such a limit of large space-time scales, we show that the asymptotic behavior of the system is suitably captured by the local occupation function of spinless fermionic modes, whose semi-classical evolution in phase space is given by a Euler hydrodynamic equation. Similarly, analytical results for the asymptotic fronts dynamics are obtained for the interacting chain via Generalized Hydrodynamics. In the last part of the work, we include large-scale quantum fluctuations on top of the semi-classical hydrodynamic background in the form of a conformal field theory that lives along the evolving Fermi contour. With this procedure, dubbed quantum generalized hydrodynamics, it is possible to obtain exact asymptotic results for the entanglement spreading during the melting dynamics.
description: 40 pages, 9 figures; To appear in Eur. Phys. J. Spec. Top
3D simulations of realistic power halos in magneto-hydrostatic sunspot atmospheres: linking theory and observation
Creators: name: Rijs, Carlos
name: Rajaguru, S. P.
name: Przybylski, Damien
name: Moradi, Hamed
name: Cally, Paul S.
name: Shelyag, Sergiy
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The well-observed acoustic halo is an enhancement in time-averaged Doppler velocity and intensity power with respect to quiet-sun values which is prominent for weak and highly inclined field around the penumbra of sunspots and active regions. We perform 3D linear wave modelling with realistic distributed acoustic sources in a MHS sunspot atmosphere and compare the resultant simulation enhancements with multi-height SDO observations of the phenomenon. We find that simulated halos are in good qualitative agreement with observations. We also provide further proof that the underlying process responsible for the halo is the refraction and return of fast magnetic waves which have undergone mode conversion at the critical $a=c$ atmospheric layer. In addition, we also find strong evidence that fast-Alfvén mode conversion plays a significant role in the structure of the halo, taking energy away from photospheric and chromospheric heights in the form of field-aligned Alfvén waves. This conversion process may explain the observed "dual-ring" halo structure at higher ($> 8 $ mHz) frequencies.
description: Accepted to be published in the Astrophysical Journal (ApJ), 12 pages, 10 figures
Die Rolle der Kultur in der Liturgieentwicklung im Lichte der Geschichte der Initiationsliturgie
Creators: name: Scheer, Ton
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 15 Nr. 2 (1979): Concilium: Internationale Zeitschrift für Theologie, Band 15, Heft 2
Helladocampa mahnerti Conde 1984
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Helladocampa
Helladocampa mahnerti

description: Helladocampa mahnerti Condé, 1984
Helladocampa mahnerti Condé, 1984: 190, figs 5a–c, 6a–b.
Diagnosis (Condé 1984)
Body length 2.8 mm; epicuticle without microdenticles; smooth thin clothing setae; sensillum of third antennomere in dorsal position; 1+1 ma, 1+1 la, 1+1 lp macrosetae on pronotum and mesonotum, 1+1 ma, 1+1 lp on metanotum; long, thin notal macrosetae smooth or with 1–2 long barbs, notal lp macrosetae extremely long; smooth or poorly barbed marginal setae longer than clothing setae; smooth subapical tarsal setae; 1+1 lp macrosetae on IV urotergite, 1+1 la, 2+2 lp on V-VII urotergites, 3+3 lp on VIII urotergite, 5+5 lp on IX abdominal segment; thin long urotergal marcrosetae; apparently described from a juvenile male with a few glandular g 1 -setae on first urosternite and with quadrangular appendages with glandular a 1 and a 2 -setae.
Habitat and distribution
Soil-dwelling species known from a single locality in Epirus, Greece (Condé 1984).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 95, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Спиновая релаксация в холловском ферромагнетике
Creators: name: Журавлев, А.С.
name: Кулик, Л.В.
Publisher: name: Институт физики твердого тела РАН
Year: 2020

description: Спиновая релаксация в холловском ферромагнетике А.С.Журавлев, Л.В.Кулик ИФТТ РАН, г. Черноголовка, Московская обл., ул.Академика Осипьяна д.2, 142432, Россия e-mail: and.zhurgmail.com Исследования явлений спиновой релаксации в двумерных электронных системах представляет собой широкую и еще не до конца описанную область. Полученные результаты могут найти применение в спинтронике, одной из наиболее быстро развивающихся отраслей прикладной физики и технологии 1. В представленном докладе обсуждаются эксперименты по релаксации спиновых возбуждений в окрестности фактора заполнений 1, холловском ферромагнетике. В предыдущих исследования время релаксации лежало в диапазоне от 1 2 до 10 нс, такие времена не давали ответа на то, какой механизм релаксации доминирует, кроме того время спиновой дефазировки невзаимодействующих спиновых экситонов измерялось лишь косвенно. В нашем исследовании мы успешно подготовили неравновесную спиновую систему, после чего применили методику измерения времяразрешенного резонансного релеевского рассеяния (РРР), дающую возможность непосредственно измерить спиновую динамику на факторе заполнения 1, измеряя изменение заполненности спиновых подуровней нулевого уровня Ландау. Измеренные времена (от 50 до 150 нс), оказались по крайней мере на порядок длиннее, результатов предыдущих экспериментов. При этом время спиновой релаксации оказалось не зависящем от температуры. Было показано, что экспериментальные данные соответствуют механизму релаксации, в котором основной вклад вносит спин-экситонная аннигиляция, обусловленная спин-орбитальным взаимодействием и случайным потенциалом. Кроме того, большие времена релаксации, 100-150 нс, дают возможность исследовать возможное конденсатное состояние неравновесных спинэкситонов. Работа выполнена в рамках госзадания ИФТТ РАН. Литература 1 I. Zutic, J. Fabian, and S. Das Sarma, Rev. Mod. Phys.76, 323(2004). 2 B. W. Alphenaar, H. O. M uller, and K. Tsukagoshi, Phys. Rev.Lett.81, 5628(1998).
Unitary evolution for anisotropic quantum cosmologies: models with variable spatial curvature
Creators: name: Pandey, Sachin
name: Banerjee, Narayan
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Contrary to the general belief, there has recently been quite a few examples of unitary evolution of quantum cosmological models. The present work gives more examples, namely Bianchi type VI and type II. These examples are important as they involve varying spatial curvature unlike the most talked about homogeneous but anisotropic cosmological models like Bianchi I, V and IX. We exhibit either explicit example of the unitary solutions of the Wheeler-DeWitt equation, or at least show that a self-adjoint extension is possible.
description: 10 pages, no figure
Ising chain: Thermal conductivity and first-principle validation of Fourier law
Creators: name: Lima, Henrique Santos
name: Tsallis, Constantino
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The thermal conductivity of a $d=1$ lattice of ferromagnetically coupled planar rotators is studied through molecular dynamics. Two different types of anisotropies (local and in the coupling) are assumed in the inertial XY model. In the limit of extreme anisotropy, both models approach the Ising model and its thermal conductivity $κ$, which, at high temperatures, scales like $κ\sim T^{-3}$. This behavior reinforces the result obtained in various $d$-dimensional models, namely $κ\propto L\, e_{q}^{-B(L^γT)^η}$ where $e_q^z \equiv[1+(1-q)z]^{\frac{1}{1-q}}\;(e_1^z=e^z)$, $L$ being the linear size of the $d$-dimensional macroscopic lattice. The scaling law $\frac{η\,γ}{q-1}=1$ guarantees the validity of Fourier's law, $\forall d$.
The Effect of Dust and Hotspots on the Thermal Stability of Laser Sails
Creators: name: Jaffe, Gabriel R.
name: Holdman, Gregory R.
name: Jang, Min Seok
name: Feng, Demeng
name: Kats, Mikhail A.
name: Brar, Victor Watson
Publisher: name: arXiv
Year: 2023
Subjects: subject: Space Physics (physics.space-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Laser sails propelled by gigawatt-scale ground-based laser arrays have the potential to reach relativistic speeds, traversing the solar system in hours and reaching nearby stars in years. Here, we describe the danger interplanetary dust poses to the survival of a laser sail during its acceleration phase. We show through multi-physics simulations how localized heating from a single optically absorbing dust particle on the sail can initiate a thermal-runaway process that rapidly spreads and destroys the entire sail. We explore potential mitigation strategies, including increasing the in-plane thermal conductivity of the sail to reduce the peak temperature at hotspots and isolating the absorptive regions of the sail which can burn away individually.
description: 7 pages, 4 figures
Measurements of nanoresonator-qubit interactions in a hybrid quantum electromechanical system
Creators: name: Rouxinol, F.
name: Hao, Y.
name: Brito, F.
name: Caldeira, A. O.
name: Irish, E. K.
name: LaHaye, M. D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Experiments to probe the basic quantum properties of motional degrees of freedom of mechanical systems have developed rapidly over the last decade. One promising approach is to use hybrid electromechanical systems incorporating superconducting qubits and microwave circuitry. However, a critical challenge facing the development of these systems is to achieve strong coupling between mechanics and qubits while simultaneously reducing coupling of both the qubit and mechanical mode to the environment. Here we report measurements of a qubit-coupled mechanical resonator system consisting of an ultra-high-frequency nanoresonator and a long coherence-time superconducting transmon qubit, embedded in superconducting coplanar waveguide cavity. It is demonstrated that the nanoresonator and transmon have commensurate energies and transmon coherence times are one order of magnitude larger than for all previously reported qubit-coupled nanoresonators. Moreover, we show that numerical simulations of this new hybrid quantum system are in good agreement with spectroscopic measurements and suggest that the nanoresonator in our device resides at low thermal occupation number, near its ground state, acting as a dissipative bath seen by the qubit. We also outline how this system could soon be developed as a platform for implementing more advanced experiments with direct relevance to quantum information processing and quantum thermodynamics, including the study of nanoresonator quantum noise properties, reservoir engineering, and nanomechanical quantum state generation and detection.
description: Main text: 12 pages, 6 figures. Supplemental material: 8 pages, 6 figures
Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents
Creators: name: Bas, Derek A.
name: Muniz, Rodrigo A.
name: Babakiray, Sercan
name: Lederman, David
name: Sipe, J. E.
name: Bristow, Alan D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Optical injection and detection of charge currents can complement conventional transport and photoemission measurements without the necessity of invasive contact that may disturb the system being examined. This is a particular concern for the surface states of a topological insulator. In this work one- and two-color sources of photocurrents are examined in epitaxial, thin films of Bi2Se3. We demonstrate that optical excitation and terahertz detection simultaneously captures one- and two- color photocurrent contributions, as previously not required in other material systems. A method is devised to isolate the two components, and in doing so each can be related to surface or bulk excitations through symmetry. This strategy allows surface states to be examined in a model system, where they have independently been verified with angle-resolved photoemission spectroscopy.
description: 8 pages, 5 figure, journal submission
Communiquer aux usagers leur durée d’attente dans les services d’urgence
Creators: name: Salazar, Lucia Rodriguez-Borlado
name: Leblanc, Pierre
name: Tazarourte, Karim
name: Michel, Philippe
name: Sigal, Alain
Publisher: name: Health & Co
Year: 2022
Subjects: Urgences hospitalières
Planification
Consultation
Qualité des soins
Parcours patient

description: Contexte et objectif. Le calcul et la communication des délais d’attente sont des enjeux importants pour l’amélioration de la qualité des services d’urgence. Ces pratiques sont pourtant sous-étudiées en France. L’objectif de notre étude était de décrire ces pratiques dans la région lyonnaise et d’identifier des pratiques innovantes. Méthode. Une enquête transversale descriptive a été menée en février 2022 auprès de 19 services d’urgence membres de la collégiale des urgences du Grand Lyon. Un questionnaire a été créé et leur a été envoyé par courriel. Des analyses statistiques descriptives des réponses ont été faites. Principaux résultats. Le calcul du délai d’attente n’est pas systématique (10 services sur 18 répondants) et les paramètres qui entrent en compte dans le calcul sont variables. La communication est faite de façon orale (13 services sur les 15 qui communiquent le délai d’attente), toujours par l’infirmier organisateur d’accueil. Un seul service a créé une méthode de consultation du délai d’attente à distance via son site web. Conclusion. Plébiscitée par les usagers et identifiée comme un enjeu important par les professionnels, la communication des délais d’attente dans les services d’urgence s’inscrit dans une démarche qui soulève néanmoins des craintes parmi les professionnels, car elle est nécessairement ambitieuse, fondée sur la fiabilisation de l’outil de mesure utilisé, la meilleure compréhension par les patients du fonctionnement de ce type de service, et le choix des bons vecteurs d’information.
Alignment and Characterisation of Remote-Refocusing Systems
Creators: name: Hong, Wenzhi
name: Sparks, Hugh
name: Dunsby, Chris
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The technique of remote refocusing is used in optical microscopy to provide rapid axial scanning without mechanically perturbing the sample and in techniques such as oblique plane microscopy that build on remote refocusing to image a tilted plane within the sample. The magnification between the pupils of the primary (O1) and secondary (O2) microscope objectives of the remote-refocusing system has been shown previously by Mohanan and Corbett [J Microsc, 288(2):95-105 (2022)] to be crucial in obtaining the broadest possible remote-refocusing range. In this work, we performed an initial alignment of a remote-refocusing system and then studied the effect of axial misalignments of O1 and O2, axial misalignment of the primary tube lens (TL1) relative to the secondary tube lens (TL2), lateral misalignments of TL2 and changes in the focal length of TL2. For each instance of the setup, we measured the mean point spread function FWHMxy of 100 nm fluorescent beads, the normalised bead integrated fluorescence signal, and calculated the axial and lateral distortion of the system: all of these quantities were mapped over the remote-refocusing range and as a function of lateral image position. This allowed us to estimate the volume over which diffraction-limited performance is achieved and how this changes with the alignment of the system.
description: 28 pages, 12 figures
Shifted moments of L functions and moments of theta functions
Creators: name: Munsch, Marc
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06

description: Assuming the Riemann Hypothesis, Soundararajan showed that $\displaystyle{\int_{0}^{T} \vert ζ(1/2 + it)\vert^{2k} \ll T(\log T)^{k^2 + ε}}$ . His method was used by Chandee to obtain upper bounds for shifted moments of the Riemann Zeta function. Building on these ideas, we obtain, conditionally, upper bounds for shifted moments of Dirichlet $L$- functions which allow us to derive upper bounds for moments of theta functions.
description: 15 pages
DETERMINANTS OF INTENTION TO ADOPT E-GOVERNMENT: MEDIATING EFFECT OF TRUST IN E-GOVERNMENT
Creators: name: Kittisak JERMSITTIPARSERT
Publisher: name: Asian Political Science Review
Year: 2024
Subjects: e-Government
Trust
Technology
Perceived Usefulness
Intention to Adopt

description: Asian Political Science Review, 8, 2, 48–59
Abkhazi Garden appeal
Creators: name: Land Conservancy Of British Columbia
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Conservation and restoration
valueUri: http://id.worldcat.org/fast/1352535
subject: Rhododendrons
valueUri: http://id.worldcat.org/fast/1097180
subject: Historic gardens
valueUri: http://id.worldcat.org/fast/957809
subject: Abkhazi, Peggy, 1902-
valueUri: http://id.worldcat.org/fast/163887
subject: Historic sites--Conservation and restoration
valueUri: http://id.worldcat.org/fast/957852
subject: Rhododendron gardens
valueUri: http://id.worldcat.org/fast/1097178
subject: Abkhazi Garden (Victoria B.C.)
subject: Gardens
valueUri: http://id.worldcat.org/fast/937895
subject: Fund raising
valueUri: http://id.worldcat.org/fast/936143

description: A form to donate money towards an appeal to preserve the Abkhazi Garden and a letter explaining its importance from the Garden Conservancy on verso. The letter begins "The Garden Conservancy believes the garden of the late Prince and Princess Abkhazi is a significant example of Victoria's horticultural heritage..."
Eine theologische Sicht der menschlichen Beziehungsfähigkeiten und der Familienintimität
Creators: name: Shea, John
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 15 Nr. 1 (1979): Concilium: Internationale Zeitschrift für Theologie, Band 15, Heft 1
Freeze-in Dark Matter via Lepton Portal: Hubble Tension and Stellar Cooling
Creators: name: Xu, Zixuan
name: Xu, Shuai
name: Zhang, Ruopeng
name: Zheng, Sibo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose a new freeze-in dark matter candidate which feebly couples to the standard model charged leptons. The feeble interactions allow it (i) to freeze-in from the Standard Model thermal bath with its relic density being either a fraction or the entirety of the observed dark matter density and (ii) to radiatively decay to two photons in the dark matter mass ranges of order keV scale with lifetime larger than the age of Universe. These features make this model a realistic realization of dark matter with late-time decay to reduce Hubble tension. We show the best-fit value of H_{0}=68.31(69.34) km s^{-1}Mpc^{-1} in light of Planck 2018+BAO(+LSS)+Pantheon data sets. We then use stellar cooling data to place constraints on the parameter space favored by the Hubble tension. While the universal coupling scenario is excluded, the hierarchical coupling scenario can be tested by future observations of white dwarfs after a careful look into photon inverse decay, Primakoff and Bremsstrahlung emission of the dark matter in various stellar systems. The viable parameter space may be linked to anomalies in future X-ray telescopes.
description: 21 pages, 8 figures
Dynablox: Real-time Detection of Diverse Dynamic Objects in Complex Environments
Creators: name: Schmid, Lukas
name: Andersson, Olov
name: Sulser, Aurelio
name: Pfreundschuh, Patrick
name: Siegwart, Roland
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Real-time detection of moving objects is an essential capability for robots acting autonomously in dynamic environments. We thus propose Dynablox, a novel online mapping-based approach for robust moving object detection in complex environments. The central idea of our approach is to incrementally estimate high confidence free-space areas by modeling and accounting for sensing, state estimation, and mapping limitations during online robot operation. The spatio-temporally conservative free space estimate enables robust detection of moving objects without making any assumptions on the appearance of objects or environments. This allows deployment in complex scenes such as multi-storied buildings or staircases, and for diverse moving objects such as people carrying various items, doors swinging or even balls rolling around. We thoroughly evaluate our approach on real-world data sets, achieving 86% IoU at 17 FPS in typical robotic settings. The method outperforms a recent appearance-based classifier and approaches the performance of offline methods. We demonstrate its generality on a novel data set with rare moving objects in complex environments. We make our efficient implementation and the novel data set available as open-source.
description: Code released at https://github.com/ethz-asl/dynablox
Theoretical Analysis of Exciton Wave Packet Dynamics in Polaritonic Wires
Creators: name: Aroeira, Gustavo J. R.
name: Kairys, Kyle
name: Ribeiro, Raphael F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a comprehensive study of exciton wave packet evolution in disordered lossless polaritonic wires. Our simulations reveal signatures of ballistic, diffusive, and subdiffusive exciton dynamics under strong light-matter coupling and identify the typical timescales associated with the transitions between these qualitatively distinct transport phenomena. We determine optimal truncations of the molecular subsystem and radiation field required for generating reliable time-dependent data from computational simulations at affordable cost. The time evolution of the photonic part of the wave function reveals that many cavity modes contribute to the dynamics in a non-trivial fashion. Hence, a sizable number of photon modes is needed to describe exciton propagation with reasonable accuracy. We find and discuss an intriguingly common lack of dominance of the photon mode on resonance with the molecular system both in the presence and absence of disorder. We discuss the implications of our investigations to the development of theoretical models and analysis of experiments where coherent intermolecular energy transport and static disorder play an important role.
Black Hole Based Quantum Computing in Labs and in the Sky
Creators: name: Dvali, Gia
name: Panchenko, Mischa
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Gases (cond-mat.quant-gas)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Analyzing some well established facts, we give a model-independent parameterization of black hole quantum computing in terms of a set of macro and micro quantities and their relations. These include the relations between the extraordinarily-small energy gap of black hole qubits and important time-scales of information-processing, such as, scrambling time and Page's time. We then show, confirming and extending previous results, that other systems of nature with identical quantum informatics features are attractive Bose-Einstein systems at the critical point of quantum phase transition. Here we establish a complete isomorphy between the quantum computational properties of these two systems. In particular, we show that the quantum hair of a critical condensate is strikingly similar to the quantum hair of a black hole. Irrespectively whether one takes the similarity between the two systems as a remarkable coincidence or as a sign of a deeper underlying connection, the following is evident. Black holes are not unique in their way of quantum information processing and we can manufacture black hole based quantum computers in labs by taking advantage of quantum criticality.
description: 25 pages, latex
Resource theory of dephasing estimation in multiqubit systems
Creators: name: Chen, Zishi
name: Hu, Xueyuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a resource theory to investigate the power of a multqubit system as a probe in the task of dephasing estimation. Our approach employs the quantum Fisher information about the dephasing parameter as the resource measure. Based on the monotonicity of quantum Fisher information, we propose two sets of free operations in our resource theory, the Hamming distance preserving operations and the selectively Hamming distance preserving operations. We derive a necessary condition for the state transformation under these free operations and demonstrate that uniform superposition states are the golden states in our resource theory. We further compare our resource theory with the resource theory of coherence and thoroughly investigate the relation between their free operations in both single-qubit and multiqubit cases. Additionally, for multiqubit systems, we discover the incompatibility between the resource theory of dephasing estimation and that of $U(1)$ asymmetry, which is responsible for phase estimation. The condition for enhancing the performance of a probe state in phase estimation while preserving its ability in dephasing estimation is also discussed. Our results provide new insights into quantum parameter estimation by the resource-theoretic approach.
description: Published version