cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Measurement-altered Ising quantum criticality
Creators: name: Murciano, Sara
name: Sala, Pablo
name: Liu, Yue
name: Mong, Roger S. K.
name: Alicea, Jason
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum critical systems constitute appealing platforms for the exploration of novel measurement-induced phenomena due to their innate sensitivity to perturbations. We study the impact of measurement on paradigmatic Ising quantum critical chains using an explicit protocol, whereby correlated ancilla are entangled with the critical chain and then projectively measured. Using a perturbative analytic framework supported by extensive numerical simulations, we demonstrate that measurements can qualitatively alter long-distance correlations in a manner dependent on the choice of entangling gate, ancilla measurement basis, measurement outcome, and nature of ancilla correlations. We derive numerous quantitative predictions for the behavior of correlations in select measurement outcomes, and also identify two strategies for detecting measurement-altered Ising criticality in measurement-averaged quantities. First, averaging the square of the order-parameter expectation value over measurement outcomes retains memory of order parameter condensation germinated in fixed measurement outcomes -- even though on average the order parameter itself vanishes. Second, we show that, in certain cases, observables can be averaged separately over measurement outcomes residing in distinct symmetry sectors, and that these `symmetry-resolved averages' reveal measurement effects even when considering standard linearly averaged observables. We identify complementary regimes in which symmetry-resolved averages and post-selection can be pursued reasonably efficiently in experiment, with the former generically outperforming the latter in the limit of sufficiently weak ancilla-critical chain entanglement. Our framework naturally adapts to more exotic quantum critical points and highlights opportunities for potential experimental realization in NISQ hardware and in Rydberg arrays.
description: 33 pages, 22 figures, comments added, new section and appendix
Vector valued de Branges spaces of entire functions based on pairs of Fredholm operator valued functions and functional model
Creators: name: Mahapatra, Subhankar
name: Sarkar, Santanu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E22, 47B32, 47B25, 47A53

description: In this paper, we have considered vector valued reproducing kernel Hilbert spaces (RKHS) $\mathcal{H}$ of entire functions associated with operator valued kernel functions. de Branges operators $\mathfrak{E}=(E_- , E_+)$ analogous to de Branges matrices have been constructed with the help of pairs of Fredholm operator valued entire functions on $\mathfrak{X}$, where $\mathfrak{X}$ is a complex seperable Hilbert space. A few explicit examples of these de Branges operators are also discussed. The newly defined RKHS $\mathcal{B}(\mathfrak{E})$ based on the de Branges operator $\mathfrak{E}=(E_-,E_+)$ has been characterized under some special restrictions. The complete parametrizations and canonical descriptions of all selfadjoint extensions of the closed, symmetric multiplication operator by the independent variable have been given in terms of unitary operators between ranges of reproducing kernels. A sampling formula for the de Branges spaces $\mathcal{B}(\mathfrak{E})$ has been discussed. A particular class of entire operators with infinite deficiency indices has been dealt with and shown that they can be considered as the multiplication operator for a specific class of these de Branges spaces. Finally, a brief discussion on the connection between the characteristic function of a completely nonunitary contraction operator and the de Branges spaces $\mathcal{B}(\mathfrak{E})$ has been given.
description: 42 pages, accepted by Journal of Mathematical Analysis and Applications
Claassenia Stark & Sivec 2010
Creators: name: Stark, Bill P.
name: Sivec, Ignac
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Claassenia

description: Claassenia ChB (Figs. 28-31) Material. China: Fujian Province, Chongan, 1♀ (IZAS). Adult habitus. Unknown, notes lost. Male. Unknown. Female. Unknown, notes lost. Larva. Unknown. Egg. Spindle shaped with low, button-like collar (Fig. 28). Total length ca. 446 μm, equatorial width ca. 360 μm. Much of chorion beyond shoulder covered with faint hexagonal follicle cell impressions bearing obscure pits in floors of follicle cell impressions (Fig.30); area surrounding collar without follicle cell impressions (Fig. 31). Micropylar row subequatorial, orifices almost linear, canals vertical (Fig. 31). Comments. One of us (IS) examined a single female in the collection of the Institute of Zoology, Academia Sinica, Beijing and obtained the egg sample. Unfortunately notes and sketches made for this specimen were lost during travel. The egg of this species differs from those of C. drukpa, C. semibrachyptera and C. sabulosa (described above). Additional material is needed in order to determine the identity of this species.
description: Published as part of Stark, Bill P. & Sivec, Ignac, 2010, Systematic Notes On The Genus Claassenia Wu (Plecoptera: Perlidae), With Description Of A New Species, pp. 303-314 in Illiesia 6 (24) on page 312, DOI: 10.5281/zenodo.4753177
Multi-body wave function of ground and low-lying excited states using unornamented deep neural networks
Creators: name: Naito, Tomoya
name: Naito, Hisashi
name: Hashimoto, Koji
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method to calculate wave functions and energies not only of the ground state but also of low-lying excited states using a deep neural network and the unsupervised machine learning technique. For systems composed of identical particles, a simple method to perform symmetrization for bosonic systems and antisymmetrization for fermionic systems is also proposed.
description: 23 pages, 18 figures, 8 tables; Typo of Eq. (25) corrected
Claassenia Stark & Sivec 2010
Creators: name: Stark, Bill P.
name: Sivec, Ignac
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Claassenia

description: Claassenia ChC (Figs. 32-35) Material examined. China: [Sichuan Province], 50 miles NW Chengtu [= Chengdu], 1910, W.N. Ferguson, 1♂, 1♀ (BMNH). Adult habitus. General color brown, head yellowish but with triangular dark brown ocellar spot, pronotum uniformly brown without distinctive rugosities. Legs uniformly brown. Male. Macropterous, forewing length 29 mm. Hemitergal lobes slender, finger-like, but slightly swollen near mid length and positioned parallel to one another for most of length (Fig. 32); inner margins of hemiterga in dorsal aspect bearing a prominent grouping of thick sensilla basiconica along most of length (Fig. 33).Tergum 9 armed with a prominent circular patch of sensilla basiconica, tergum 8 without obvious sensilla basiconica patch. Female. Macropterous, forewing length 40 mm. Subgenital plate produced as a small triangular projection bearing an apical, triangular notch (Fig. 34). Intersegmental membrane between sterna 9-10 with a patch of microtrichia. Vagina broad near orifice and strongly narrowed in anterior third (Fig. 35); spermatheca a large membranous structure on a long slender pedicel. Egg. Spindle shaped with low button-like collar. No specimens available for scanning electron microscopy. Larva. Unknown. Comments. This is another intriguing, and apparently distinctive, species from Sichuan Province. The female subgenital plate is similar to, but much smaller than that of the Bhutanese species, C. drupka, described above, and the parallel position and prominent sensilla basiconica of the male hemiterga also appear to be distinctive. Unfortunately, several of the types of Claassenia species known from Sichuan province are unavailable to us.
description: Published as part of Stark, Bill P. & Sivec, Ignac, 2010, Systematic Notes On The Genus Claassenia Wu (Plecoptera: Perlidae), With Description Of A New Species, pp. 303-314 in Illiesia 6 (24) on pages 312-313, DOI: 10.5281/zenodo.4753177
An ontology-supported transaction formalism protocol in infrastructure management
Creators: name: Zeb, Jehan
Publisher: name: University of British Columbia
Year: 2014

description: Infrastructure organizations use diversified information systems to exchange data (transaction). Presently, data exchange in the area of infrastructure management is accomplished in a manual and ad hoc basis. The growing trend is to transform these manual data exchanges to a computer-to-computer based transactions. The core research questions include: What transactions are candidates to formalize?—this question is dealt with identifying and selecting a potential transaction for IT improvement—Asset Inventory and Condition Assessment Reporting/Tangible Capital Asset (AI&CAR/TCA) Reporting. Why formalize transactions?”—this question is dealt with developing and applying an Infrastructure Management—Process Maturity Model to assess the degree to which work processes and communications are formalized in infrastructure management. The results indicate that the work processes and communications are currently performed on an ad hoc basis. How to formalize and manage transactions?— this question is dealt with developing and applying an ontology-supported Transaction Formalism Protocol (TFP), which is composed of two parts: ontology and protocol. Two ontologies, the Transaction Domain Ontology and Tangible Capital Asset ontology, were developed to represent transaction domain knowledge and Tangible Capital Asset knowledge respectively to support the design, management, and implementation of transactions in infrastructure management. Moreover, an eight-step procedure—the TFP was developed from two perspectives: The TFP Specification modeled each step of the protocol as a function for which inputs, controls, mechanisms, tools/techniques, and outputs were defined, whereas the TFP Tool includes a set of forms and guidance developed for specific steps of the protocol. The proposed TFP was applied to develop transaction specification for the AI&CAR/TCA Reporting, which was managed and implemented through developing the Infrastructure Transaction Management Portal and Asset Information Integrator System repectively. The evaluation results indicate that both the ontologies are consistent, concise, complete, correct, and clear. Similarly, the protocol was found to be feasible, usable, useful, and generic. The major contributions include the development of two ontologies and protocol, whereas the medium contributions are: IT use survey, development of the IM-PMM, portal, and asset integrator information system. The minor contribution; however, includes the development of the transaction specification for the AI&CAR/TCA Reporting.
ATTac-2000: An Adaptive Autonomous Bidding Agent
Creators: name: Kearns, M.
name: Littman, M. L.
name: Singh, S.
name: Stone, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The First Trading Agent Competition (TAC) was held from June 22nd to July 8th, 2000. TAC was designed to create a benchmark problem in the complex domain of e-marketplaces and to motivate researchers to apply unique approaches to a common task. This article describes ATTac-2000, the first-place finisher in TAC. ATTac-2000 uses a principled bidding strategy that includes several elements of adaptivity. In addition to the success at the competition, isolated empirical results are presented indicating the robustness and effectiveness of ATTac-2000's adaptive strategy.
Splitting of the ground state manifold of classical Heisenberg spins as couplings are varied
Creators: name: Chandra, Samarth
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We construct clusters of classical Heisenberg spins with two-spin $\vec{S}_i.\vec{S}_j$-type interactions for which the ground state manifold consists of disconnected pieces. We extend the construction to lattices and couplings for which the ground state manifold splits into an exponentially large number of disconnected pieces at a sharp point as the interaction strengths are varied with respect to each other. In one such lattice we construct, the number of disconnected pieces in the ground state manifold can be counted exactly.
description: Accepted for publication in Physica A; 6 pages, 4 figures
Energy Efficient Operation of Adaptive Massive MIMO 5G HetNets
Creators: name: Marwaha, Siddarth
name: Jorswieck, Eduard A.
name: Jassim, Mostafa
name: Kuerner, Thomas
name: Perez, David Lopez
name: Geng, Xilnli
name: Bao, Harvey
Publisher: name: arXiv
Year: 2023
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: For energy efficient operation of the massive multiple-input multiple-output (MIMO) networks, various aspects of energy efficiency maximization have been addressed, where a careful selection of number of active antennas has shown significant gains. Moreover, switching-off physical resource blocks (PRBs) and carrier shutdown saves energy in low load scenarios. However, the joint optimization of spectral PRB allocation and spatial layering in a heterogeneous network has not been completely solved yet. Therefore, we study a power consumption model for multi-cell multi-user massive MIMO 5G network, capturing the joint effects of both dimensions. We characterize the optimal resource allocation under practical constraints, i.e., limited number of available antennas, PRBs, base stations (BSs), and frequency bands. We observe a single spatial layer achieving lowest energy consumption in very low load scenarios, whereas, spatial layering is required in high load scenarios. Finally, we derive novel algorithms for energy efficient user to BS assignment and propose an adaptive algorithm for PRB assignment and power control. All results are illustrated by numerical system-level simulations, describing a realistic metropolis scenario. The results show that a higher frequency band should be used to support users with large rate requirements via spatial multiplexing and assigning each user maximum available PRBs.
Efficient Methods for Qualitative Spatial Reasoning
Creators: name: Nebel, B.
name: Renz, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The theoretical properties of qualitative spatial reasoning in the RCC8 framework have been analyzed extensively. However, no empirical investigation has been made yet. Our experiments show that the adaption of the algorithms used for qualitative temporal reasoning can solve large RCC8 instances, even if they are in the phase transition region -- provided that one uses the maximal tractable subsets of RCC8 that have been identified by us. In particular, we demonstrate that the orthogonal combination of heuristic methods is successful in solving almost all apparently hard instances in the phase transition region up to a certain size in reasonable time.
A New Simple Method for the Analysis of Extensive Air Showers
Creators: name: Kh., H. Hedayati
name: Anvari, A.
name: Bahmanabadi, M.
name: Samimi, J.
name: Ghomi, M. Khakian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The most important goal of studying an extensive air shower is to find the energy, mass and arrival direction of its primary cosmic ray. In order to find these parameters, the core position and arrival direction of the shower should be determined. In this paper, a new method for finding core location has been introduced that utilizes trigger time information of particle detectors. We have also developed a simple technique to reconstruct the arrival direction. Our method is not based upon density-sensitive detectors which are sensitive to the number of crossing particles and is also independent of lateral distribution models. This model has been developed and examined by the analysis of simulated shower events generated by the CORSIKA package.
Claassenia Stark & Sivec 2010
Creators: name: Stark, Bill P.
name: Sivec, Ignac
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Claassenia

description: Claassenia MyA (Figs. 36-37) Claassenia sp. B Stark & Gaufin, 1976:41 Material examined. Burma [Myanmar]: Myitkyina, 30 May 1945, L.C. Kuitert, 1♂ (pinned, SEC). Myanmar: 16 km E Putao, Kaung Mu Lon, 28-30 April 1998, S. Murzin, V. Siniaev, 1♂ (ZIRA). Adult habitus. General color brown to dark brown. Head yellow brown with darker pigment over ocellar region. Pronotum brown, legs and wings dark brown. Male. Macropterous, forewing length 29 mm. Hemitergal lobes short, finger-like, narrowed at tip and widest at mid length in dorsal aspect (Fig. 36); dorsal margin straight in lateral aspect, ventroapical margin bare (Fig. 37). Tergum 9 with a large circular patch of sensilla basiconica, tergum 8 with a smaller patch. Female. Unknown. Larva. Unknown. Comments. Both specimens listed above are from the Irrawaddy River drainage of northern Myanmar. These specimens may represent an undescribed species but a larger sample, including gravid females is needed for confirmation.
description: Published as part of Stark, Bill P. & Sivec, Ignac, 2010, Systematic Notes On The Genus Claassenia Wu (Plecoptera: Perlidae), With Description Of A New Species, pp. 303-314 in Illiesia 6 (24) on page 313, DOI: 10.5281/zenodo.4753177
Presupernova Structure of Massive Stars
Creators: name: Meakin, Casey A.
name: Sukhbold, Tuguldur
name: Arnett, David
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Issues concerning the structure and evolution of core collapse progenitor stars are discussed with an emphasis on interior evolution. We describe a program designed to investigate the transport and mixing processes associated with stellar turbulence, arguably the greatest source of uncertainty in progenitor structure, besides mass loss, at the time of core collapse. An effort to use precision observations of stellar parameters to constrain theoretical modeling is also described.
description: Proceedings for invited talk at High Energy Density Laboratory Astrophysics conference, Caltech, March 2010. Special issue of Astrophysics and Space Science, submitted for peer review: 7 pages, 3 figures
Influence of asymmetry and nodal planes on high-harmonic generation in heteronuclear molecules
Creators: name: Augstein, B. B.
name: Faria, C. Figueira de Morisson
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The relation between high-harmonic spectra and the geometry of the molecular orbitals in position and momentum space is investigated. In particular we choose two isoelectronic pairs of homonuclear and heteronuclear molecules, such that the highest occupied molecular orbital of the former exhibit at least one nodal plane. The imprint of such planes is a strong suppression in the harmonic spectra, for particular alignment angles. We are able to identify two distinct types of nodal planes. If the nodal planes are determined by the atomic wavefunctions only, the angle for which the yield is suppressed will remain the same for both types of molecules. In contrast, if they are determined by the linear combination of atomic orbitals at different centers in the molecule, there will be a shift in the angle at which the suppression occurs for the heteronuclear molecules, with regard to their homonuclear counterpart. This shows that, in principle, molecular imaging, which uses the homonuclear molecule as a reference and enables one to observe the wavefunction distortions in its heteronuclear counterpart, is possible.
description: 14 pages, 7 figures. Figs. 3, 5 and 6 have been simplified in order to comply with the arXiv size requirements
Generalized Carter constant for quadrupolar test bodies in Kerr spacetime
Creators: name: Compère, Geoffrey
name: Druart, Adrien
name: Vines, Justin
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We establish the existence of a deformation of the usual Carter constant which is conserved along the motion in a fixed Kerr background of a spinning test body possessing the spin-induced quadrupole coupling of a black hole. The conservation holds perturbatively up to second order in the test body's spin. This constant of motion is obtained through the explicit resolution of the conservation constraint equations, employing covariant algebraic and differential relations amongst covariant building blocks of the Kerr background. For generic spin-induced quadrupole couplings, which describe compact objects such as neutron stars, we obtain a no-go result on the existence of such a conserved quantity.
description: Version after peer-review on SciPost. Minor corrections
Learning Geometrically-Constrained Hidden Markov Models for Robot Navigation: Bridging the Topological-Geometrical Gap
Creators: name: Kaelbling, L. P.
name: Shatkay, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Hidden Markov models (HMMs) and partially observable Markov decision processes (POMDPs) provide useful tools for modeling dynamical systems. They are particularly useful for representing the topology of environments such as road networks and office buildings, which are typical for robot navigation and planning. The work presented here describes a formal framework for incorporating readily available odometric information and geometrical constraints into both the models and the algorithm that learns them. By taking advantage of such information, learning HMMs/POMDPs can be made to generate better solutions and require fewer iterations, while being robust in the face of data reduction. Experimental results, obtained from both simulated and real robot data, demonstrate the effectiveness of the approach.
Comparison of monomorphic and polymorphic approaches for uncertainty quantification with experimental investigations
Creators: name: Drieschner, Martin
name: Eigel, Martin
name: Gruhlke, Robert
name: Hömberg, Dietmar
name: Petryna, Yuri
Publisher: name: Weierstrass Institute
Year: 2019
Subjects: subject: Structural failure
subject: experimental and numerical investigations
subject: monomorphic uncertainty modeling
subject: polymorphic uncertainty modeling
subject: artificial neural networks
subject: fuzzy
subject: uncertainty quantification
subject: 35R60
subject: 47B80
subject: 60H35
subject: 65C20
subject: 65N12
subject: 65N22
subject: 65N55
subject: 65J10

description: Unavoidable uncertainties due to natural variability, inaccuracies, imperfections or lack of knowledge are always present in real world problems. To take them into account within a numerical simulation, the probability, possibility or fuzzy set theory as well as a combination of these are potentially usable for the description and quantification of uncertainties. In this work, different monomorphic and polymorphic uncertainty models are applied on linear elastic structures with non-periodic perforations in order to analyze the individual usefulness and expressiveness. The first principal stress is used as an indicator for structural failure which is evaluated and classified. In addition to classical sampling methods, a surrogate model based on artificial neural networks is presented. With regard to accuracy, efficiency and resulting numerical predictions, all methods are compared and assessed with respect to the added value. Real experiments of perforated plates under uniaxial tension are validated with the help of the different uncertainty models.
Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications
Creators: name: Alqedra, Mohammed K.
name: Deshmukh, Chetan
name: Liu, Shuping
name: Serrano, Diana
name: Horvath, Sebastian P.
name: Rafie-Zinedine, Safi
name: Abdelatief, Abdullah
name: Rippe, Lars
name: Kröll, Stefan
name: Casabone, Bernardo
name: Ferrier, Alban
name: Tallaire, Alexandre
name: Goldner, Philippe
name: de Riedmatten, Hugues
name: Walther, Andreas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Rare-earth (RE) ion doped nano-materials are promising candidates for a range of quantum technology applications. Among RE ions, the so-called Kramers' ions possess spin transitions in the GHz range at low magnetic fields, which allows for high-bandwidth multimode quantum storage, fast qubit operations as well as interfacing with superconducting circuits. They also present relevant optical transitions in the infrared. In particular, Er$^{3+}$ has an optical transition in the telecom band, while Nd$^{3+}$ presents a high-emission-rate transition close to 890 nm. In this paper, we measure spectroscopic properties that are of relevance to using these materials in quantum technology applications. We find the inhomogeneous linewidth to be 10.7 GHz for Er$^{3+}$ and 8.2 GHz for Nd$^{3+}$, and the excited state lifetime T$_1$ to be 13.68 ms for Er$^{3+}$ and 540 $μ$s for Nd$^{3+}$. We study the dependence of homogeneous linewidth on temperature for both samples, with the narrowest linewidth being 379 kHz (T$_2$ = 839 ns) for Er$^{3+}$ measured at 3 K, and 62 kHz (T$_2$ = 5.14 $μ$s) for Nd$^{3+}$ measured at 1.6 K. Further, we investigate time-dependent homogeneous linewidth broadening due to spectral diffusion and the dependence of homogeneous linewidth on magnetic field, in order to get additional clarity of mechanisms that can influence the coherence time. In light of our results, we discuss two applications: single qubit-state readout and a Fourier-limited single photon source.
description: 9 pages, 5 figures
Recombination in nuclear collisions
Creators: name: Hwa, Rudolph C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recombination is a hadronization process that converts partons to hadrons at late time, but the description has no quantitative significance without some meaningful input on the parton distributions at earlier time. Thus observations of particle spectra and correlations have definitive implications on the partonic processes at all transverse momenta. After presenting a general review of the subject at the Workshop, I selected two topics in nuclear collisions for more detailed discussion, which are summarized here. One is on the azimuthal anisotropy at low $p_T$ due to hard or semihard scattering of partons that create ridges with or without triggers. The ridge particles are the products of recombination of thermal partons enhanced by the energy loss of hard or semihard partons. Their $ϕ$ dependence at midrapidity can be determined essentially from geometry. The other topic is on the scaling behavior in $ϕ$ and centrality at high $p_T$, where the hadronization process is dominated by TS and SS recombination. The relevant RHIC data are found to have the same scaling behavior. But at LHC such scaling is badly broken at $p_T \sim 10$ GeV/c if two-jet recombination is important. At the end of this article some comments are made to relate our study of the effects of semihard partons to the observation of minijets in the analyses of STAR data.
description: 11 pages, 6 figures, talk given at Workshop on "Critical Examination of RHIC Paradigms", Austin, TX, April 2010
Accelerating Reinforcement Learning through Implicit Imitation
Creators: name: Boutilier, C.
name: Price, B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Imitation can be viewed as a means of enhancing learning in multiagent environments. It augments an agent's ability to learn useful behaviors by making intelligent use of the knowledge implicit in behaviors demonstrated by cooperative teachers or other more experienced agents. We propose and study a formal model of implicit imitation that can accelerate reinforcement learning dramatically in certain cases. Roughly, by observing a mentor, a reinforcement-learning agent can extract information about its own capabilities in, and the relative value of, unvisited parts of the state space. We study two specific instantiations of this model, one in which the learning agent and the mentor have identical abilities, and one designed to deal with agents and mentors with different action sets. We illustrate the benefits of implicit imitation by integrating it with prioritized sweeping, and demonstrating improved performance and convergence through observation of single and multiple mentors. Though we make some stringent assumptions regarding observability and possible interactions, we briefly comment on extensions of the model that relax these restricitions.
Additional file 1 of An EMT-related genes signature as a prognostic biomarker for patients with endometrial cancer
Creators: name: Yu, Yonghui
name: Zhang, Yiwen
name: Li, Zhi
name: Dong, Yongshun
name: Huang, Hongmei
name: Yang, Binyao
name: Zhao, Eryong
name: Chen, Yongxiu
name: Yang, Lei
name: Lu, Jiachun
name: Qiu, Fuman
Publisher: name: figshare
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Pharmacology
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Additional file 1: Figure S1. The associations between 540 EMT-related DEGs and EC progression.
Fractional Korn's inequalities without boundary conditions
Creators: name: Harutyunyan, D.
name: Mengesha, T.
name: Mikayelyan, H.
name: Scott, J. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This work establishes fractional analogues of Korn's first and second inequalities for vector fields in fractional Sobolev spaces defined over a bounded domain. The validity of the inequalities require no additional boundary condition, extending existing fractional Korn's inequalities that are only applicable for Sobolev vector fields satisfying zero Dirichlet boundary conditions. The domain of definition is required to have a $C^1$-boundary or, more generally, a Lipschitz boundary with small Lipschitz constant. We conjecture that the inequalities remain valid for vector fields defined over any Lipschitz domain. We support this claim by presenting a proof of the inequalities for vector fields defined over planar convex domains.
description: To appear in the journal of Mathematics and Mechanics of Complex Systems
Analytical model of non-Markovian decoherence in donor-based charge quantum bits
Creators: name: Lastra, F
name: Reyes, S
name: Wallentowitz, S
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We develop an analytical model for describing the dynamics of a donor-based charge quantum bit (qubit). As a result, the quantum decoherence of the qubit is analytically obtained and shown to reveal non-Markovian features: The decoherence rate varies with time and even attains negative values, generating a non-exponential decay of the electronic coherence and a later recoherence. The resulting coherence time is inversely proportional to the temperature, thus leading to low decoherence below a material dependent characteristic temperature.
description: 19 pages, 3 figures
Exactness of the Fock space representation of the q-commutation relations
Creators: name: Kennedy, Matthew
name: Nica, Alexandru
Publisher: name: arXiv
Year: 2010
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L05, 46L10, 46L54

description: We show that for all q in the interval (-1,1), the Fock representation of the q-commutation relations can be unitarily embedded into the Fock representation of the extended Cuntz algebra. In particular, this implies that the C*-algebra generated by the Fock representation of the q-commutation relations is exact. An immediate consequence is that the q-Gaussian von Neumann algebra is weakly exact for all q in the interval (-1,1).
description: 20 pages
Superfluid density of an open dissipative condensate
Creators: name: Keeling, Jonathan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: I calculate the superfluid density of a non-equilibrium steady state condensate of particles with finite lifetime. Despite the absence of a simple Landau critical velocity, a superfluid response survives, but dissipation reduces the superfluid fraction. I also suggest an idea for how the superfluid density of an example of such a system, i.e. microcavity polaritons, might be measured.
description: 4 pages, 3 figures
Cryogenic hyperabrupt strontium titanate varactors for sensitive reflectometry of quantum dots
Creators: name: Eggli, Rafael S.
name: Svab, Simon
name: Patlatiuk, Taras
name: Trüssel, Dominique A.
name: Carballido, Miguel J.
name: Kwon, Pierre Chevalier
name: Geyer, Simon
name: Li, Ang
name: Bakkers, Erik P. A. M.
name: Kuhlmann, Andreas V.
name: Zumbühl, Dominik M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Radio frequency reflectometry techniques enable high bandwidth readout of semiconductor quantum dots. Careful impedance matching of the resonant circuit is required to achieve high sensitivity, which however proves challenging at cryogenic temperatures. Gallium arsenide-based voltage-tunable capacitors, so-called varactor diodes, can be used for in-situ tuning of the circuit impedance but deteriorate and fail at temperatures below 10 K and in magnetic fields. Here, we investigate a varactor based on strontium titanate with hyperabrupt capacitance-voltage characteristic, that is, a capacitance tunability similar to the best gallium arsenide-based devices. The varactor design introduced here is compact, scalable and easy to wirebond with an accessible capacitance range from 45 pF to 3.2 pF. We tune a resonant inductor-capacitor circuit to perfect impedance matching and observe robust, temperature and field independent matching down to 11 mK and up to 2 T in-plane field. Finally, we perform gate-dispersive charge sensing on a germanium/silicon core/shell nanowire hole double quantum dot, paving the way towards gate-based single-shot spin readout. Our results bring small, magnetic field-resilient, highly tunable varactors to mK temperatures, expanding the toolbox of cryo-radio frequency applications.
description: 5 pages + 5 pages Appendix; 4 figures + 8 figures in Appendix; presented at APS March Meeting 2023 Session N72.002
Newtonian and viscoelastic liquid jet impingement on a moving surface
Creators: name: Guo, Yuchen
Publisher: name: University of British Columbia
Year: 2014

description: Motivated by the need to improve transfer efficiencies of liquid coatings from jet impingement in railroad friction control applications, an experimental investigation into Newtonian and viscoelastic liquid jet impingement on moving surfaces is presented. Seven PEO-glycerine-water solutions and three commercial liquid friction modifiers were tested with a variety of jet speeds, jet diameters, surface speeds and surface roughnesses. The effects of these test conditions on jet impingement splash behaviours as well as jet and lamella geometries were studied. High-speed imaging was employed to visualize the interaction between the impinging jet and the moving surface. Experiments on the effect of modest surface roughness revealed that, while jet and surface speed were both important factors, splash was more likely to occur on surfaces with lower roughness levels. By analyzing experimental results for Newtonian liquids, a relation between lamella geometry and test conditions were found, which can be used to predict lamella dimensions. Three types of non-Newtonian behaviours were observed at high surface speed and low jet speed: jet necking, jet bending and jet stretching.
Interstitial Iron Controlled Superconductivity in Fe1+xTe0.7Se0.3
Creators: name: Rodriguez, E. E.
name: Stock, C.
name: Hsieh, P-Y
name: Butch, N.
name: Paglione, J.
name: Green, M. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The superconducting series, Fe(Te,Se), has a complex structural and magnetic phase diagram that is dependent on composition and occupancy of a secondary interstitial Fe site. In this letter, we show that superconductivity in Fe1+xTe0.7Se0.3 can be enhanced by topotactic deintercalation of the interstitial iron, demonstrating the competing roles of the two iron sites. Neutron diffraction reveals a flattening of the Fe(Te,Se)4 tetrahedron on Fe removal of iron and an increase in negative thermal expansion within the ab plane that correlates with increased lattice strain. Inelastic neutron scattering shows that a gapped excitation at 6 meV, evolves into gapless paramagnetic scattering with increasing iron; similar to the fluctuations observed for non-superconducting Fe1+xTe itself.
Cardiovascular function in HER2-postivie breast cancer survivors
Creators: name: Bonsignore, Lynne Alis Jean
Publisher: name: University of British Columbia
Year: 2015

description: Background: Trastuzumab, a HER2 antagonist, has been shown to improve rates of overall survival in patients with HER2-positive breast cancer. However, cardiotoxic effects associated with treatment limits these benefits. Due to an increase in survival years, women with a history of HER2-positive breast cancer might be at increased risk of developing cardiotoxicity (i.e., LVEF < 55% with or without accompanying symptoms of heart failure) during survivorship. Exercise (“stress”) conditions is an established method to examine comprehensively impairments in cardiovascular function that may go undetected during resting conditions providing insight into the risk for future cardiac events. Purpose: We sought to assess cardiac and vascular function of HER2-positive breast cancer survivors at rest and under exercise conditions. Hypothesis: 1) At rest, vascular dysfunction would be evident in breast cancer survivors. 2) Exercise would reveal cardiac dysfunction in HER2-positive breast cancer survivors, which was not apparent under resting conditions. Methods: Eight HER2-positive breast cancer survivors and eight age-matched healthy controls underwent the following measures: 1) resting vascular function (Applanation tonometry, pulse wave velocity and baroreceptor sensitivity) and cardiac function (2D-echocardiography), 2) exercise haemodynamics (heart rate, stroke volume, cardiac output) during an incremental exercise test, and 3) ventricular-vascular coupling (left ventricular elastance and arterial elastance) at rest and during incremental exercise. Results: At rest, there were no differences between groups in any echocardiographic measures. No differences were detected in vascular function, although baroreceptor sensitivity was reduced in the breast cancer group. Resting ventricular-vascular coupling was also similar between groups. With exercise, there was evidence of reduced left ventricular performance with a blunted response to increase left ventricular elastance. No differences were observed in arterial elastance or ventricular-vascular coupling. All haemodynamic responses were similar between groups. Conclusion: In HER2-positive breast cancer survivors there are indicators of impairments in cardiac function during exercise conditions, but limited differences during resting conditions. Exercise echocardiography may be clinically relevant for detecting impairments in left ventricular function in HER2-positive breast cancer survivors that appear to have normal cardiac function at rest.
Spike Onset Dynamics and Response Speed in Neuronal Populations
Creators: name: Wei, Wei
name: Wolf, Fred
Publisher: name: arXiv
Year: 2011
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Recent studies of cortical neurons driven by fluctuating currents revealed cutoff frequencies for action potential encoding of several hundred Hz. Theoretical studies of biophysical neuron models have predicted a much lower cutoff frequency of the order of average firing rate or the inverse membrane time constant. The biophysical origin of the observed high cutoff frequencies is thus not well understood. Here we introduce a neuron model with dynamical action potential generation, in which the linear response can be analytically calculated for uncorrelated synaptic noise. We find that the cutoff frequencies increase to very large values when the time scale of action potential initiation becomes short.
Ultraviolet and X-ray Variability of the Seyfert 1.5 Galaxy Markarian 817
Creators: name: Winter, Lisa M.
name: Danforth, Charles
name: Vasudevan, Ranjan
name: Brandt, W. N.
name: Scott, Jennifer
name: Froning, Cynthia
name: Keeney, Brian
name: Shull, J. Michael
name: Penton, Steve
name: Mushotzky, Richard
name: Schneider, Donald P.
name: Arav, Nahum
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present an investigation of the ultraviolet and X-ray spectra of the Seyfert 1.5 galaxy Markarian 817. The ultraviolet analysis includes two recent observations taken with the Cosmic Origins Spectrograph in August and December 2009, as well as archival spectra from the International Ultraviolet Explorer and the Hubble Space Telescope. Twelve Ly-alpha absorption features are detected in the 1997 GHRS and 2009 COS spectra - of these, four are associated with high-velocity clouds in the interstellar medium, four are at low-significance, and the remaining four are intrinsic features, which vary between the GHRS and COS observations. The strongest intrinsic absorber in the 1997 spectrum has a systemic velocity of ~ -4250 km/s. The corresponding feature in the COS data is five times weaker than the GHRS absorber. The three additional weak (equivalent width from 13-54 mA) intrinsic Ly-alpha absorbers are at systemic velocities of -4100 km/s, -3550 km/s, and -2600 km/s. However, intrinsic absorption troughs from highly ionized C IV and N V, are not detected in the COS observations. No ionized absorption signatures are detected in the ~ 14 ks XMM-Newton EPIC spectra. The factor of five change in the intrinsic Ly$α$ absorber is most likely due to bulk motions in the absorber, since there is no drastic change in the UV luminosity of the source from the GHRS to the COS observations. In a study of variability of Mrk 817, we find that the X-ray luminosity varies by a factor of ~40 over 20 years, while the UV continuum/emission lines vary by at most a factor of ~2.3 over 30 years. The variability of the X-ray luminosity is strongly correlated with the X-ray power-law index, but no correlation is found with the simultaneous optical/UV photometry.
description: 43 pages, 13 figures, accepted to ApJ
Young-type interference in projectile-electron loss in energetic ion-molecule collisions
Creators: name: Voitkiv, A. B.
name: Najjari, B.
name: Fischer, D.
name: Artemyev, A.
name: Surzhykov, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Under certain conditions an electron bound in a fast projectile-ion, colliding with a molecule, interacts mainly with the nuclei and inner shell electrons of atoms forming the molecule. Due to their compact localization in space and distinct separation from each other these molecular centers play in such collisions a role similar to that of optical slits in light scattering leading to pronounced interference in the spectra of the electron emitted from the projectile.
description: 4 pages, 3 figures
Localized states coupled to a network of chiral modes in minimally twisted bilayer graphene
Creators: name: Wittig, P.
name: Dominguez, F.
name: De Beule, C.
name: Recher, P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Minimally twisted bilayer graphene in the presence of an interlayer bias develops a triangular network of valley chiral modes that propagate along the $AB/BA$ interfaces and scatter at the $AA$ regions. The low energy physics of the resulting network can be captured by means of a phenomenological scattering network model, allowing to calculate the energy spectrum and the magnetoconductance in a straightforward way. Although there is in general a good agreement between microscopic and phenomenological models, there are some aspects that have not been captured so far with the latter. In particular, the appearance of flatbands in the energy spectrum associated to a localized density of states at the $AA$ regions. To bring both approaches closer together, we modify the previous energy independent phenomenological model and add the possibility to scatter to a set of discrete energy levels at the $AA$ regions, yielding a $S$ matrix with energy dependent parameters. Furthermore, we investigate the impact of Coulomb repulsion in these regions on a mean-field level and discuss possible effects of decoherence due to elastic and inelastic cotunneling events.
description: 15 pages, 7+2 figures, comments are welcome
Are there stable long-range ordered Fe(1-x)Cr(x) compounds?
Creators: name: Erhart, Paul
name: Sadigh, Babak
name: Caro, Alfredo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The heat of formation of Fe-Cr alloys undergoes an anomalous change of sign at small Cr concentrations. This observation raises the question whether there are intermetallic phases present in this composition range. Here we report the discovery of several long-range ordered structures that represent ground state phases at zero Kelvin. In particular we have identified a structure at 3.7% Cr with an embedding energy which is 49 meV/Cr atom below the solid solution. This implies there is an effective long-range attractive interaction between Cr atoms. We propose that the structures found in this study complete the low temperature-low Cr region of the phase diagram.
description: 3 pages, 2 figures