cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Maxwell fish eye for polarized light
Creators: name: Davtyan, Mher
name: Gevorkian, Zhyrair
name: Nersessian, Armen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the propagation of polarized light in the medium with Maxwell fish eye refraction index profile. We show that polarization violates the additional symmetries of medium, so that ray trajectories no longer remain closed. Then we suggest a modified, polarization-dependent Maxwell fish eye refraction index which restores all symmetries of initial profile and yields closed trajectories of polarized light. Explicit expressions for the polarization dependent integrals of motion and the solutions of corresponding ray trajectories are presented.
description: 8 pages, 2 fugures, updated version accepted for publication
Black hole superradiant instability for massive spin-2 fields
Creators: name: Dias, Oscar J. C.
name: Lingetti, Giuseppe
name: Pani, Paolo
name: Santos, Jorge E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Due to coherent superradiant amplification, massive bosonic fields can trigger an instability in spinning black holes, tapping their energy and angular momentum and forming macroscopic Bose-Einstein condensates around them. This phenomenon produces gaps in the mass-spin distribution of astrophysical black holes, a continuous gravitational-wave signal emitted by the condensate, and several environmental effects relevant for gravitational-wave astronomy and radio images of black holes. While the spectrum of superradiantly unstable mode is known in great detail for massive scalar (spin-0) and vector (spin-1) perturbations, so far only approximated results were derived for the case of massive tensor (spin-2) fields, due to the nonseparability of the field equations. Here, solving a system of ten elliptic partial differential equations, we close this program and compute the spectrum of the most unstable modes of a massive spin-2 field for generic black-hole spin and boson mass, beyond the hydrogenic approximation and including the unique dipole mode that dominates the instability in the spin-2 case. We find that the instability timescale for this mode is orders of magnitude shorter than for any other superradiant mode, yielding much stronger constraints on massive spin-2 fields. These results pave the way for phenomenological studies aimed at constraining beyond Standard Model scenarios, ultralight dark matter candidates, and extensions to General Relativity using gravitational-wave and electromagnetic observations, and have implications for the phase diagram of vacuum solutions of higher-dimensional gravity.
description: 5+3 pages, 2+1 figures v2: extended appendix with numerical details. Matches PRD version
Factors Influencing The Adoption Of Mobile Banking Service: The Case Of Selected Commercial Banks In Addis Ababa, Ethiopia
Creators: name: Derbew, Samuel
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: This study is aimed to investigate Factor influencing adoption of mobile banking service in case of commercial banks in Ethiopia. By taking the research objectives and questions into considerations, only quantitative research approach and both descriptive and explanatory research design was used. The study was delimited to convenience and purposive sampling techniques. Quantitative data are collected using a structured questionnaire which has been developed and distributed to a sample of 384 Mobile banking users. With a response rate of 89.7%, 332 questionnaires have been returned and were valid for data analysis. The quantitative data was analyzed by using descriptive and inferential analysis. The findings of descriptive statistics have shown that, the mean score of Mobile banking adoption variables i.e. perceived usefulness, perceived ease of use, security and privacy, self-efficacy and facilitating condition (in terms of bank support) have been 4.03, 4.17, 3.17, 4.03, 2.60, respectively. All selected dimensions of independent variables have a significant correlation with the dependent variable "mobile banking adoption" with 95% confidence level & at 0.05 p-value, by scoring a Pearson Correlation Coefficient "R-value" value of 0.744**, 0.616**, 0.717**, 0.719**, 0.705**, respectively. In this case relatively perceived usefulness had a higher strong relationship with mobile banking adoption. Likewise, the empirical findings of the multiple regression indicated that the predictor variables perceived usefulness (β=0.191; P<.05); perceived ease of use (β= 0.303; P<.05); Security and privacy (β= 0.047; P<.05); Self-efficacy (β= 0.117; P<.05), Bank support (β= 0.029; P<.05); have a positive and significant effect on adoption of mobile banking. These findings are beneficial for commercial banks in Ethiopia to identify factors that influence the adoption of mobile banking service. The study recommends banks should focus on offering a mobile banking service that is easy to understand and use. Likewise, there should be More studies on mobile banking adoption to be conducted in other areas of the country to find out if there could be any similarities
Complementarity Between Hyperkamiokande and DUNE in Determining Neutrino Oscillation Parameters
Creators: name: Fukasawa, Shinya
name: Ghosh, Monojit
name: Yasuda, Osamu
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we investigate the sensitivity to the neutrino mass hierarchy, the octant of the mixing angle $θ_{23}$ and the CP phase $δ_{CP}$ in the future long-baseline experiments T2HK and DUNE as well as in the atmospheric neutrino observation at Hyperkamiokande (HK). We show for the first time that the sensitivity is enhanced greatly if we combine these three experiments. Our results show that the hierarchy sensitivity of both T2HK and HK are limited due to the presence of parameter degeneracy. But this degeneracy is removed when T2HK and HK are added together. With T2HK+HK (DUNE), the neutrino mass hierarchy can be determined at least at $ 5 σ$ (8 $σ$) C.L. for any value of true $δ_{CP}$. With T2HK+HK+DUNE the significance of the mass hierarchy increases to almost 15 $σ$ for the unfavorable value of $δ_{CP}$. For these combined setup, octant can be resolved except $43.5^\circ < θ_{23} < 48^\circ$ at $5σ$ C.L for both the hierarchies irrespective of the value of $δ_{CP}$. The significance of CP violation is around 10 $σ$ C.L. for $δ_{CP} \sim \pm 90^\circ$. Apart from that these combined facility has the capability to discover CP violation for at least $68\%$ fraction of the true $δ_{CP}$ values at $5 σ$ for any value of true $θ_{23}$. We also find that, with combination of all these three, the precision of $Δm^2_{\rm eff}$, $\sin^2θ_{23}$ and $δ_{CP}$ becomes 0.3%, 2% and 20% respectively. We also clarify how the octant degeneracy occurs in the HK atmospheric neutrino experiment.
description: 28 pages, 11 figures, 2 tables, Version accepted for publication in Nucl. Phys. B
Leiharbeit und Befristung im Kontext mittelständischerArbeits- und Führungskräftepolitik
Creators: name: Martens, Bernd
name: Bluhm, Katharina
name: Trappmann, Vera
name: Demmler, Peter
Publisher: name: Lucius & Lucius Verlagsgesellschft GmbH
Year: 2009
Subjects: subject: 300
subject: 650

description: Auf der Basis eines Datensatzes über mittelständische Unternehmen in Deutschland werden Zusammenhänge zwischen flexibilisierten Arbeitsvertragsgestaltungen und Betriebsmerkmalen untersucht. Zudem werden Befristung und Leiharbeit im Lichte der Kombination von Arbeits- und Führungskräftepolitik betrachtet. Flexibilisierte Arbeitsvertragsgestaltungen variieren nicht mit den Qualifikationsprofilen der Betriebe. Hingegen beeinflussen Veränderungen des Mitarbeiterbedarfs, die Betriebsgröße, regionale Strukturen und unternehmensstrategische Ausrichtungen die Nutzungsintensität insbesondere von Leiharbeit. In Bezug auf die Zusammenhänge von Arbeits- und Führungskräftepolitik werden vier Kombinationen unterschieden, die alle empirisch vorkommen und die sich durch Branchen- und Regionaleffekte erklären lassen. Dabei entspricht die westdeutsche Industrie mit einem höheren Gewicht positiver Entsprechungen von Arbeits- und Führungskräftepolitik am ehesten noch dem Idealfall des rheinischen Kapitalismus. Nutzungsintensitäten flexibilisierter Arbeitsverträge spielen in diesem Zusammenhang bislang keine Rolle.
description: Arbeit
Mean-field dynamics of open quantum systems with collective operator-valued rates: validity and application
Creators: name: Fiorelli, Eliana
name: Müller, Markus
name: Lesanovsky, Igor
name: Carollo, Federico
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a class of open quantum many-body Lindblad dynamics characterized by an all-to-all coupling Hamiltonian and by dissipation featuring collective ``state-dependent" rates. The latter encodes local incoherent transitions that depend on average properties of the system. This type of open quantum dynamics can be seen as a generalization of classical (mean-field) stochastic Markov dynamics, in which transitions depend on the instantaneous configuration of the system, to the quantum domain. We study the time evolution in the limit of infinitely large systems, and we demonstrate the exactness of the mean-field equations for the dynamics of average operators. We further derive the effective dynamical generator governing the time evolution of (quasi-)local operators. Our results allow for a rigorous and systematic investigation of the impact of quantum effects on paradigmatic classical models, such as quantum generalized Hopfield associative memories or (mean-field) kinetically-constrained models.
description: 43 pages,2 figures
RGB-T Tracking Based on Mixed Attention
Creators: name: Luo, Yang
name: Guo, Xiqing
name: Dong, Mingtao
name: Yu, Jin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: RGB-T tracking involves the use of images from both visible and thermal modalities. The primary objective is to adaptively leverage the relatively dominant modality in varying conditions to achieve more robust tracking compared to single-modality tracking. An RGB-T tracker based on mixed attention mechanism to achieve complementary fusion of modalities (referred to as MACFT) is proposed in this paper. In the feature extraction stage, we utilize different transformer backbone branches to extract specific and shared information from different modalities. By performing mixed attention operations in the backbone to enable information interaction and self-enhancement between the template and search images, it constructs a robust feature representation that better understands the high-level semantic features of the target. Then, in the feature fusion stage, a modality-adaptive fusion is achieved through a mixed attention-based modality fusion network, which suppresses the low-quality modality noise while enhancing the information of the dominant modality. Evaluation on multiple RGB-T public datasets demonstrates that our proposed tracker outperforms other RGB-T trackers on general evaluation metrics while also being able to adapt to longterm tracking scenarios.
description: 14 pages, 10 figures
Wavelet Transform-assisted Adaptive Generative Modeling for Colorization
Creators: name: Li, Jin
name: Li, Wanyun
name: Xu, Zichen
name: Wang, Yuhao
name: Liu, Qiegen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Unsupervised deep learning has recently demonstrated the promise of producing high-quality samples. While it has tremendous potential to promote the image colorization task, the performance is limited owing to the high-dimension of data manifold and model capability. This study presents a novel scheme that exploits the score-based generative model in wavelet domain to address the issues. By taking advantage of the multi-scale and multi-channel representation via wavelet transform, the proposed model learns the richer priors from stacked coarse and detailed wavelet coefficient components jointly and effectively. This strategy also reduces the dimension of the original manifold and alleviates the curse of dimensionality, which is beneficial for estimation and sampling. Moreover, dual consistency terms in the wavelet domain, namely data-consistency and structure-consistency are devised to leverage colorization task better. Specifically, in the training phase, a set of multi-channel tensors consisting of wavelet coefficients is used as the input to train the network with denoising score matching. In the inference phase, samples are iteratively generated via annealed Langevin dynamics with data and structure consistencies. Experiments demonstrated remarkable improvements of the proposed method on both generation and colorization quality, particularly in colorization robustness and diversity.
Spin torques and anomalous velocity in spin textures induced by fast electron injection from topological ferromagnets: The role of gauge fields
Creators: name: Bhattacharjee, Satadeep
name: Lee, Seung-Cheol
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A new method for analysing magnetization dynamics in spin textures under the influence of fast electron injection from topological ferromagnetic sources such as Dirac half metals has been proposed. These electrons, traveling at a velocity $v$ with a non-negligible value of $v/c$ (where c is the speed of light), generate a non-equilibrium magnetization density in the spin-texture region, which is related to an electric dipole moment via relativistic interactions. When this resulting dipole moment interacts with gauge fields in the spin-texture region, an effective field is created that produces spin torques. These torques, like spin-orbit torques that occur when electrons are injected from a heavy metal into a ferromagnet, can display both damping-like and anti-damping-like properties. Finally, we demonstrate that such an interaction between the dipole moment and the gauge field introduces an anomalous velocity that can contribute to transverse electrical conductivity in the spin texture in a way comparable to the topological Hall effect.
Massive Corrections to Entanglement in Minimal E8 Toda Field Theory
Creators: name: Castro-Alvaredo, Olalla A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this letter we study the exponentially decaying corrections to saturation of the second Rényi entropy of one interval of length L in minimal E8 Toda field theory. It has been known for some time that the entanglement entropy of a massive quantum field theory in 1+1 dimensions saturates to a constant value for m1 L <<1 where m1 is the mass of the lightest particle in the spectrum. Subsequently, results by Cardy, Castro-Alvaredo and Doyon have shown that there are exponentially decaying corrections to this behaviour which are characterised by Bessel functions with arguments proportional to m1 L. For the von Neumann entropy the leading correction to saturation takes the precise universal form -K0(2m1 L)/8 whereas for the Rényi entropies leading corrections which are proportional to K0(m1 L) are expected. Recent numerical work by Pálmai for the second Rényi entropy of minimal E8 Toda has found next-to-leading order corrections decaying as exp(-2m1 L) rather than the expected exp(-m1 L). In this paper we investigate the origin of this result and show that it is incorrect. An exact form factor computation of correlators of branch point twist fields reveals that the leading corrections are proportional to K0(m1 L) as expected.
description: 20 pages, 6 figures. In v2 sections 4 & 5 have been rewritten to improve the presentation of results and conclusions
Sigature of the universal super Efimov Effect: three-body contact in two dimensional Fermi gases
Creators: name: Zhang, Pengfei
name: Yu, Zhenhua
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: A new class of universal "three-body" bound states has been recently predicted theoretically for identical fermions interacting at p-wave resonance in two dimensions. This phenomenon is called the super Efimov effect since the binding energies of the states follow a intriguing double exponential scaling. However, experimental resolution of this scaling is expected to meet formidable challenges. In this work, we introduce a new thermodynamic quantity, the three-body contact $C_θ$, to quantify three-body correlations in a two dimensional gas composed of the resonantly interacting fermions; the contact $C_θ$ is the consequence of the underlying universal super Efimov effect in the many-body context. We show how $C_θ$ affects physical observables such as the radio-frequency spectrum, the momentum distribution and the atom loss rate. Signature of the elusive super Efimov effect in the thermodynamic system can be pinned down by the detection of the three-body contact $C_θ$ via these observables.
description: 5 pages, 1 figure
Dynamical atom-wall Casimir-Polder effect after a sudden change of the atomic position
Creators: name: Noto, Antonio
name: Passante, Roberto
name: Rizzuto, Lucia
name: Spagnolo, Salvatore
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the dynamical Casimir-Polder force between an atom and a conducting wall during the time evolution of the system from a partially dressed state. This state is obtained by a sudden change of the atomic position with respect to the plate. To evaluate the time-dependent atom-plate Casimir-Polder force we solve the Heisenberg equations for the field and atomic operators by an iterative technique. We find that the dynamical atom-plate Casimir-Polder interaction exhibits oscillation in time, and can be attractive or repulsive depending on time and the atom-wall distance. We also investigate the time dependence of global observables, such as the field and atomic Hamiltonians, and discuss some interesting features of the dynamical process bringing the interaction energy to the equilibrium configuration.
description: 10 pages, 3 figures, submitted to Journal of Physics: Conference Series (Proceedings of the DICE2022 Conference - Castiglioncello, Italy)
Chemistry of a light impurity in a Bose-Einstein condensate
Creators: name: Christianen, Arthur
name: Cirac, J. Ignacio
name: Schmidt, Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In ultracold atomic gases, a unique interplay arises between phenomena known from condensed matter physics, few-body physics and chemistry. Similar to an electron in a solid, an impurity in an ultracold gas can get dressed by excitations from the medium, forming a quasiparticle called the polaron. We study how dressing of an impurity leads to a modification of its chemical reactivity. Using a Gaussian state variational method in the frame of the impurity, we demonstrate that three-body correlations lead to an instability of the polaron. This instability is connected to an Efimov resonance, but shifted to smaller interactions by many-body effects, showing that polaron formation stimulates Efimov physics and the associated chemistry.
description: 6 pages, 4 figures
Other colours : communicating with colour in a multicultural society, a studio investigation
Creators: name: Burgemeestre, Lee .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Hamiltonian effective field theory study of the $\mathbf{N^*(1440)}$ resonance in lattice QCD
Creators: name: Liu, Zhan-Wei
name: Kamleh, Waseem
name: Leinweber, Derek B.
name: Stokes, Finn M.
name: Thomas, Anthony W.
name: Wu, Jia-Jun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the phase shifts and inelasticities associated with the $N^*(1440)$ Roper resonance and connect these infinite-volume observables to the finite-volume spectrum of lattice QCD using Hamiltonian effective field theory. We explore three hypotheses for the structure of the Roper resonance. All three hypotheses are able to describe the scattering data well. In the third hypothesis the Roper resonance couples the low-lying bare basis-state component associated with the ground state nucleon with the virtual meson-baryon contributions. Here the non-trivial superpositions of the meson-baryon scattering states are complemented by bare basis-state components explaining their observation in contemporary lattice QCD calculations. The merit of this scenario lies in its ability to not only describe the observed nucleon energy levels in large-volume lattice QCD simulations but also explain why other low-lying states have been missed in today's lattice QCD results for the nucleon spectrum.
description: 14 pages, 14 figures; version to be published in Phys. Rev. D
Ronald Gebauer, Hanna Petschauer, Georg Vobruba: Wer sitzt in der Armutsfalle? Selbstbehauptung zwischen Sozialhilfe und Arbeitsmarkt, Forschung aus der Hans-Böckler-Stiftung, Bd. 40, Berlin: edition sigma, 2002, ISBN 3-89404-971-5, 231 S., Euro 14,90
Creators: name: Lessenich, Stefan
Publisher: name: Lucius & Lucius Verlagsgesellschaft
Year: 2003
Subjects: subject: 300
subject: 650

description: Arbeit
Nonlinear realisation approach to topologically massive supergravity
Creators: name: Kuzenko, Sergei M.
name: Stirling, Jake C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We develop a nonlinear realisation approach to topologically massive supergravity in three dimensions, with and without a cosmological term. It is a natural generalisation of a similar construction for ${\cal N}=1$ supergravity in four dimensions, which was recently proposed by one of us. At the heart of both formulations is the nonlinear realisation approach to gravity which was given by Volkov and Soroka fifty years ago in the context of spontaneously broken local supersymmetry. In our setting, the action for cosmological topologically massive supergravity is invariant under two different local supersymmetries. One of them acts on the Goldstino, while the other supersymmetry leaves the Goldstino invariant. The former can be used to gauge away the Goldstino, and then the resulting action coincides with that given in the literature.
description: 29 pages; V2: comments and reference added; V3: published paper
From Efimov Physics to the Bose Polaron using Gaussian States
Creators: name: Christianen, Arthur
name: Cirac, J. Ignacio
name: Schmidt, Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Since the Efimov effect was introduced in 1970, a detailed theoretical understanding of Efimov physics has been developed in the few-body context. However, it has proven to be challenging to describe the role Efimov-type correlations play in many-body systems such as quenched or collapsing Bose-Einstein condensates (BECs). To study the impact the Efimov effect can have in such scenarios, we consider a light impurity immersed in a weakly interacting BEC, forming a Bose polaron. In this case, the higher-order correlations are localized around the impurity, making it more feasible to develop a theoretical description. Specifically, we employ a Gaussian state variational Ansatz in the reference frame of the impurity, capable of both capturing the Efimov effect and the formation of the polaron cloud. We find that the Efimov effect leads to a cooperative binding of bosons to the impurity and the formation of a many-body bound state. As a result, the polaron is not the ground state, but rendered a metastable excited state which can decay into these Efimov clusters. While this decay is slow for small interaction strengths, it becomes more prominent as the attractive scattering length increases, up to the point where the polaron becomes completely unstable. This critical scattering length can be interpreted as a many-body shifted Efimov resonance, where the scattering of two excitations of the bath with the polaron can lead to bound state formation. Compared to the few-body case, the resonance is shifted to smaller attractive scattering lengths due to the participation of the polaron cloud in the cooperative binding process. This corresponds to an intriguing scenario of polaron-assisted chemistry, where many-body effects lead to enhanced signal of the chemical recombination process, which can be directly probed in state-of-the-art experiments.
description: 20 pages, 9 figures
NMPC-Based Cooperative Strategy For A Target Pair To Lure Two Attackers Into Collision
Creators: name: Manoharan, Amith
name: Sujit, P. B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a cooperative target defense strategy using nonlinear model-predictive control (NMPC) framework for a two--targets two--attackers (2T2A) game. The 2T2A game consists of two attackers and two targets. Each attacker needs to capture a designated target individually. However, the two targets cooperate to lure the attackers into a collision. We assume that the cooperative target pair do not have perfect knowledge of the attacker states, and hence they estimate the attacker states using an extended Kalman filter (EKF). The NMPC scheme computes closed- loop optimal control commands for the targets while respecting imposed state and control constraints. Theoretical analysis is carried out to determine regions that will lead to the targets' survival, given the initial positions of the attacker and target agents. Numerical simulations are carried out to evaluate the performance of the proposed NMPC- based strategy for different scenarios.
description: 18 pages, 12 figures
Hyperspectral Image Analysis with Subspace Learning-based One-Class Classification
Creators: name: Kilickaya, Sertac
name: Ahishali, Mete
name: Sohrab, Fahad
name: Ince, Turker
name: Gabbouj, Moncef
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Hyperspectral image (HSI) classification is an important task in many applications, such as environmental monitoring, medical imaging, and land use/land cover (LULC) classification. Due to the significant amount of spectral information from recent HSI sensors, analyzing the acquired images is challenging using traditional Machine Learning (ML) methods. As the number of frequency bands increases, the required number of training samples increases exponentially to achieve a reasonable classification accuracy, also known as the curse of dimensionality. Therefore, separate band selection or dimensionality reduction techniques are often applied before performing any classification task over HSI data. In this study, we investigate recently proposed subspace learning methods for one-class classification (OCC). These methods map high-dimensional data to a lower-dimensional feature space that is optimized for one-class classification. In this way, there is no separate dimensionality reduction or feature selection procedure needed in the proposed classification framework. Moreover, one-class classifiers have the ability to learn a data description from the category of a single class only. Considering the imbalanced labels of the LULC classification problem and rich spectral information (high number of dimensions), the proposed classification approach is well-suited for HSI data. Overall, this is a pioneer study focusing on subspace learning-based one-class classification for HSI data. We analyze the performance of the proposed subspace learning one-class classifiers in the proposed pipeline. Our experiments validate that the proposed approach helps tackle the curse of dimensionality along with the imbalanced nature of HSI data.
Strong laser physics, non-classical light states and quantum information science
Creators: name: Bhattacharya, Utso
name: Lamprou, Theocharis
name: Maxwell, Andrew S.
name: Ordóñez, Andrés F.
name: Pisanty, Emilio
name: Rivera-Dean, Javier
name: Stammer, Philipp
name: Ciappina, Marcelo F.
name: Lewenstein, Maciej
name: Tzallas, Paraskevas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Strong laser physics is a research direction that relies on the use of high-power lasers and has led to fascinating achievements ranging from relativistic particle acceleration to attosecond science. On the other hand, quantum optics has been built on the use of low photon number sources and has opened the way for groundbreaking discoveries in quantum technology, advancing investigations ranging from fundamental tests of quantum theory to quantum information processing. Despite the tremendous progress, until recently these directions have remained disconnected. This is because, the majority of the interactions in the strong-field limit have been successfully described by semi-classical approximations treating the electromagnetic field classically, as there was no need to include the quantum properties of the field to explain the observations. The link between strong laser physics, quantum optics, and quantum information science has been developed in the recent past. Studies based on fully quantized and conditioning approaches have shown that intense laser--matter interactions can be used for the generation of controllable entangled and non-classical light states. This achievement opens the way for a vast number of investigations stemming from the symbiosis of strong laser physics, quantum optics, and quantum information science. Here, after an introduction to the fundamentals of these research directions, we report on the recent progress in the fully quantized description of intense laser--matter interaction and the methods that have been developed for the generation of non-classical light states and entangled states. Also, we discuss the future directions of non-classical light engineering using strong laser fields, and the potential applications in ultrafast and quantum information science.
description: 60 pages, 20 figures. Comments are welcome
The Impact Of Nonverbal Communication Of Employees On Customer Satisfaction; The Case Of Commercial Bank Of Ethiopia
Creators: name: Endawoke, Abebe
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Customer satisfaction has become an essence of success in today's highly competitive world. In service industry communication is vital to determine customer satisfaction. The purpose of the study is to assess the impact of nonverbal communication of employees on customer satisfaction. Primary data like questionnaires and secondary data were used for this study. Convenience sampling technique was used to distribute and collect the questionnaire. Correlation and multiple regression analysis were implemented for presentation and interpretation of the findings. The total of 314 Commercial Bank of Ethiopia customers participated in this study. Four dimensions of nonverbal communication (kinesics paralanguage, proxemics, and physical appearance) were identified. The results of the study showed that nonverbal communication has a positive and significant impact on customer satisfaction. The finding indicated that kinesics is the most important nonverbal communication dimension followed by paralanguage which have positive and significant impact on customer satisfaction. It is highly hoped that the information found from this study assist service providers to understand better about the importance of nonverbal communication and its impact on customer satisfaction. The organizations should give emphasis to nonverbal communications of employees to maintain and improve customer satisfaction.
Experimental multipartite entanglement and randomness certification of the W state in the quantum steering scenario
Creators: name: Máttar, A.
name: Skrzypczyk, P.
name: Aguilar, G. H.
name: Nery, R. V.
name: Ribeiro, P. H. Souto
name: Walborn, S. P.
name: Cavalcanti, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently [Cavalcanti \textit{et al.} Nat Commun \textbf{6}, 7941 (2015)] proposed a method to certify the presence of entanglement in asymmetric networks, where some users do not have control over the measurements they are performing. Such asymmetry naturally emerges in realistic situtations, such as in cryptographic protocols over quantum networks. Here we implement such "semi-device independent" techniques to experimentally witness all types of entanglement on a three-qubit photonic W state. Furthermore we analise the amount of genuine randomness that can be certified in this scenario from any bipartition of the three-qubit W state.
description: v2: text improved, steering witness redefined so that their violation provides the steering robustness, experimental data included in an appendix
Lernförderliche Arbeitsgestaltung, Arbeitszufriedenheit und Anspruchsniveau
Creators: name: Richter, Falk
name: Pohlandt, Andreas
Publisher: name: Lucius & Lucius Verlagsgesellschft GmbH
Year: 2009
Subjects: subject: 300
subject: 650

description: Der vorliegende Beitrag beschäftigt sich mit Zusammenhängen zwischen einer lernförderlichen Gestaltung der Arbeitssituation und Arbeitszufriedenheit unter Berücksichtigung des individuellen Anspruchsniveaus. Dabei wird jeweils eine Stichprobe von Arbeitenden aus dem Bereich Banken und Versicherungen sowie aus dem industriellen Bereich betrachtet. Dies lässt Schlussfolgerungen bzgl. der Verallgemeinerbarkeit der Ergebnisse zu. Die Ergebnisse verweisen auf signifikante positive Zusammenhänge zwischen dem Ausmaß lernförderlicher Gestaltung von Aufgaben und Organisationen und Arbeitszufriedenheit. Diese Zusammenhänge sind teilweise (signifikant) höher, wenn die Arbeitenden höhere Ansprüche an die Lernhaltigkeit ihrer Arbeitsaufgabe aufweisen, jedoch kann keine signifikante Moderatorfunktion für das individuelle Anspruchsniveau festgestellt werden. Die Ergebnisse verweisen somit auf die Möglichkeit der Förderung von Arbeitszufriedenheit durch Merkmale wie Tätigkeitspielraum, Anforderungsvielfalt und Entwicklungsmöglichkeiten unabhängig von individuellen Unterschieden im Hinblick auf Ansprüche an die Arbeitsgestaltung.
description: Arbeit
Collectivity in diffusion of colloidal particles: from effective interactions to spatially correlated noise
Creators: name: Majka, M.
name: Góra, P. F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The collectivity in the simultaneous diffusion of many particles, i.e. the interdependence of stochastic forces affecting different particles in the same solution, is a largely overlooked phenomenon with no well-established theory. Recently, we have proposed a novel type of thermodynamically consistent Langevin dynamics driven by the Spatially Correlated Noise (SCN) that can contribute to the understanding of this problem. This model draws a link between the theory of effective interactions in binary colloidal mixtures and the properties of SCN. In the current article we review this model from the perspective of collective diffusion and generalize it to the case of multiple ($N>2$) particles. Since our theory of SCN-driven Langevin dynamics has certain issues that could not be resolved within its framework, in this article we also provide another approach to the problem of collectivity. We discuss the multi-particle Mori-Zwanzig model, which is fully microscopically consistent. Indeed, we show that this model supplies many information, complementary to the SCN-based approach, e.g. it predicts the deterministic dynamics of the relative distance between the particles, it provides the approximation for non-equilibrium effective interactions and predicts the collective subdiffusion of tracers in group. These results provide the short-range, inertial limit of the earlier model and agree with its predictions under some general conditions. In this article we also review the origin of SCN and its consequences for the variety of physical systems, with emphasis on the colloids.
description: A significantly revised version in response to the reviews, submitted to the Journal of Physics A as a contribution to the special issue on 'Marian Smoluchowski's 1916 paper - a century of inspiration'
Quantum metrology with critical driven-dissipative collective spin system
Creators: name: Pavlov, Venelin P.
name: Porras, Diego
name: Ivanov, Peter A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a critical dissipaive quantum metrology schemes for single parameter estimation which are based on a quantum probe consisting of coherently driven ensemble of $N$ spin-1/2 particles under the effect of squeezed, collective spin decay. The collective spin system exhibits a dissipative phase transition between thermal and ferromagnetic phases, which is characterized with nonanalytical behavior of the spin observables. We show that thanks to the dissipative phase transition the sensitivity of the parameter estimation can be significantly enhanced. Furthermore, we show that our steady state is an entangled spin squeezed state which allow to perform parameter estimation with sub shot-noise limited measurement uncertainty.
description: 7 pages, 5 figures
Quasienergy operators and generalized squeezed states for systems of trapped ions
Creators: name: Mihalcea, Bogdan M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Collective many-body dynamics for time-dependent quantum Hamiltonian functions is investigated for a dynamical system that exhibits multiple degrees of freedom, in this case a combined (Paul and Penning) trap. Quantum stability is characterized by a discrete quasienergy spectrum, while the quasienergy states are symplectic coherent states. We introduce the generators of the Lie algebra of the symplectic group ${\cal {SL}}(2, \mathbb R)$, which we use to build the coherent states (CS) associated to the system under investigation. The trapped ion is treated as a harmonic oscillator (HO) to which we associate the quantum Hamilton function. We obtain the kinetic and potential energy operators as functions of the Lie algebra generators and supply the expressions for the classical coordinate, momentum, kinetic and potential energy, as well as the total energy. In addition, we also infer the dispersions for the coordinate and momentum, together with the asymmetry and the flatness parameter for the distribution. The system interaction with laser radiation is also examined for a system of identical two-level atoms. The Hamilton function for the Dicke model is derived. The optical system is modelled as a HO (trapped ion) that undergoes interaction with an external laser field and we use it to engineer a squeezed state of the electromagnetic (EM) field. We consider coherent and squeezed states associated to both ion dynamics and to the EM field. Such an approach enables one to build CS in a compact and smart manner by use of the group theory.
Word and bit line operation of a 1x1 μm2 superconducting vortex-based memory
Creators: name: Golod, Taras
name: Morlet-Decarnin, Lise
name: Krasnov, Vladimir M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The lack of dense random access memory is one of the main bottlenecks for the creation of a digital superconducting computer. In this work we study experimentally vortex-based superconducting memory cells. Three main results are obtained. First, we test scalability and demonstrate that the cells can be straightforwardly miniaturized to submicron sizes. Second, we emphasize the importance of conscious geometrical engineering. In the studied devices we introduce an asymmetric easy track for vortex motion and show that it enables a controllable manipulation of vortex states. Finally, we perform a detailed analysis of word and bit line operation of a 1x1 μm2 cell. High-endurance, nonvolatile operation at zero magnetic field is reported. Remarkably, we observe that the combined word and bit line threshold current is significantly reduced compared to the bare word-line operation. This could greatly improve the selectivity of individual cell addressing in a multibit RAM. The achieved one square micron area is an important milestone and a significant step forward towards creation of a dense cryogenic memory.
description: 9 pages, 6 figures
Neutron-proton effective mass splitting in neutron-rich matter
Creators: name: Wang, Sibo
name: Tong, Hui
name: Zhao, Qiang
name: Wang, Chencan
name: Ring, Peter
name: Meng, Jie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Nucleon effective masses in neutron-rich matter are studied with the relativistic Brueckner-Hartree-Fock (RBHF) theory in the full Dirac space. The neutron and proton effective masses for symmetric nuclear matter are 0.80 times rest mass, which agrees well with the empirical values. In neutron-rich matter, the effective mass of the neutron is found larger than that of the proton, and the neutron-proton effective mass splittings at the empirical saturation density are predicted as $0.187α$ with $α$ being the isospin asymmetry parameter. The result is compared to other ab initio calculations and is consistent with the constraints from the nuclear reaction and structure measurements, such as the nucleon-nucleus scattering, the giant resonances of $^{208}$Pb, and the Hugenholtz-Van Hove theorem with systematics of nuclear symmetry energy and its slope. The predictions of the neutron-proton effective mass splitting from the RBHF theory in the full Dirac space might be helpful to constrain the isovector parameters in phenomenological density functionals.
description: 14 pages, 4 figures, the same as the online version
Non-rigid precession of magnetic stars
Creators: name: Lander, S. K.
name: Jones, D. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Stars are, generically, rotating and magnetised objects with a misalignment between their magnetic and rotation axes. Since a magnetic field induces a permanent distortion to its host, it provides effective rigidity even to a fluid star, leading to bulk stellar motion which resembles free precession. This bulk motion is however accompanied by induced interior velocity and magnetic field perturbations, which are oscillatory on the precession timescale. Extending previous work, we show that these quantities are described by a set of second-order perturbation equations featuring cross-terms scaling with the product of the magnetic and centrifugal distortions to the star. For the case of a background toroidal field, we reduce these to a set of differential equations in radial functions, and find a method for their solution. The resulting magnetic-field and velocity perturbations show complex multipolar structure and are strongest towards the centre of the star.
description: 41 pages, 11 figures, 3 tables. Accepted for publication in MNRAS
Quantitative analysis of diffraction by liquids using a pink-spectrum X-ray source
Creators: name: Singh, Saransh
name: Coleman, Amy L.
name: Zhang, Shuai
name: Coppari, Federica
name: Gorman, Martin G.
name: Smith, Raymond F.
name: Eggert, Jon H.
name: Briggs, Richard
name: Fratanduono, Dayne E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We describes a new approach for performing quantitative structure-factor analysis and density measurements of liquids using x-ray diffraction with a pink-spectrum x-ray source. The methodology corrects for the pink beam effect by performing a Taylor series expansion of the diffraction signal. The mean density, background scale factor, peak x-ray energy about which the expansion is performed, and the cutoff radius for density measurement are estimated using the derivative-free optimization scheme. The formalism is demonstrated for a simulated radial distribution function for tin. Finally, the proposed methodology is applied to experimental data on shock compressed tin recorded at the Dynamic Compression Sector at the Advanced Photon Source, with derived densities comparing favorably to other experimental results and the equations of state of tin.
description: 24 pages, 6 figures
Learning to Downsample for Segmentation of Ultra-High Resolution Images
Creators: name: Jin, Chen
name: Tanno, Ryutaro
name: Mertzanidou, Thomy
name: Panagiotaki, Eleftheria
name: Alexander, Daniel C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: I.4.6

description: Many computer vision systems require low-cost segmentation algorithms based on deep learning, either because of the enormous size of input images or limited computational budget. Common solutions uniformly downsample the input images to meet memory constraints, assuming all pixels are equally informative. In this work, we demonstrate that this assumption can harm the segmentation performance because the segmentation difficulty varies spatially. We combat this problem by introducing a learnable downsampling module, which can be optimised together with the given segmentation model in an end-to-end fashion. We formulate the problem of training such downsampling module as optimisation of sampling density distributions over the input images given their low-resolution views. To defend against degenerate solutions (e.g. over-sampling trivial regions like the backgrounds), we propose a regularisation term that encourages the sampling locations to concentrate around the object boundaries. We find the downsampling module learns to sample more densely at difficult locations, thereby improving the segmentation performance. Our experiments on benchmarks of high-resolution street view, aerial and medical images demonstrate substantial improvements in terms of efficiency-and-accuracy trade-off compared to both uniform downsampling and two recent advanced downsampling techniques.
description: 19 pages, 17 figures