cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Causal perturbative QED and white noise
Creators: name: Wawrzycki, Jaroslaw
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the Bogoliubov's causal perturbative QFT, which includes only one refinement: the creation-annihilation operators at a point, \emph{i.e.} for a specific momentum, are mathematically interpreted as the Hida operators from the white noise analysis. We leave the rest of the theory completely unchanged. This allows avoiding infrared -- and ultraviolet -- divergences in the transition to the adiabatic limit for interacting fields and elimination of the free parameters of the theory, associated with the choice of normalization in computation of the retarded and advanced parts of causal distributions (corresponding to the freedom in the choice of renormalization scheme). This enhances the predictive power of the theory, and in particular allows to derive non-trivial mass relations. The approach is general and can be applied to investigate any perturbative QFT.
Joseph Wolfgang von Deschwanden (1819-1866) an Ottilie Grossbach (1836-1919), verheiratete von Deschwanden
Creators: name: Deschwanden, Joseph Wolfgang von
Publisher: name: [s.n.]
Year: 1857

description: Brief ohne Ortsangabe, vermutlich aus Zürich, datiertt mit: "Auf meinem Geschäftszimmer, Donnerstag 2 Uhr nachmittags.
Der 10.12.1857 war ein Donnerstag
A Tribe Competition-Based Genetic Algorithm for Feature Selection in Pattern Classification
Creators: name: Ma, Benteng
name: Xia, Yong
Publisher: name: arXiv
Year: 2017
Subjects: subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Feature selection has always been a critical step in pattern recognition, in which evolutionary algorithms, such as the genetic algorithm (GA), are most commonly used. However, the individual encoding scheme used in various GAs would either pose a bias on the solution or require a pre-specified number of features, and hence may lead to less accurate results. In this paper, a tribe competition-based genetic algorithm (TCbGA) is proposed for feature selection in pattern classification. The population of individuals is divided into multiple tribes, and the initialization and evolutionary operations are modified to ensure that the number of selected features in each tribe follows a Gaussian distribution. Thus each tribe focuses on exploring a specific part of the solution space. Meanwhile, tribe competition is introduced to the evolution process, which allows the winning tribes, which produce better individuals, to enlarge their sizes, i.e. having more individuals to search their parts of the solution space. This algorithm, therefore, avoids the bias on solutions and requirement of a pre-specified number of features. We have evaluated our algorithm against several state-of-the-art feature selection approaches on 20 benchmark datasets. Our results suggest that the proposed TCbGA algorithm can identify the optimal feature subset more effectively and produce more accurate pattern classification.
The ALMA Early Science View of FUor/EXor objects. II. The Very Wide Outflow Driven by HBC 494
Creators: name: Ruíz-Rodríguez, D.
name: Cieza, L. A.
name: Williams, J. P.
name: Tobin, J. J.
name: Hales, A.
name: Zhu, Z.
name: Mužić, K.
name: Principe, D.
name: Canovas, H.
name: Zurlo, A.
name: Casassus, S.
name: Perez, S.
name: Prieto, J. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Atacama Large Millimeter/sub-millimeter Array (ALMA) Cycle-2 observations of the HBC 494 molecular outflow and envelope. HBC 494 is an FU Ori-like object embedded in the Orion A cloud and is associated with the reflection nebulae Re50 and Re50N. We use $^{12}$CO, $^{13}$CO and C$^{18}$O spectral line data to independently describe the outflow and envelope structures associated with HBC 494. The moment-1 map of the $^{12}$CO emission shows the widest outflow cavities in a Class I object known to date (opening angle $\sim$ 150$^{^{\circ}}$). The morphology of the wide outflow is likely to be due to the interaction between winds originating in the inner disc and the surrounding envelope. The low-velocity blue- and red-shifted $^{13}$CO and C$^{18}$O emission trace the rotation and infall motion of the circumstellar envelope. Using molecular line data and adopting standard methods for correcting optical depth effects, we estimate its kinematic properties, including an outflow mass on the order of 10$^{-1}$ M$_{\odot}$. Considering the large estimated outflow mass for HBC 494, our results support recent theoretical work suggesting that wind-driven processes might dominate the evolution of protoplanetary discs via energetic outflows.
description: 14 pages, 12 Figures
Fermi Arcs From Dynamical Variational Monte Carlo
Creators: name: Rosenberg, P.
name: Sénéchal, D.
name: Tremblay, A. -M. S.
name: Charlebois, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Variational Monte Carlo is a many-body numerical method that scales well with system size. It has been extended to study the Green function only recently by Charlebois and Imada (2020). Here we generalize the approach to systems with open boundary conditions in the absence of translational invariance. Removing these constraints permits the application of embedding techniques like Cluster perturbation theory (CPT). This allows us to solve an enduring problem in the physics of the pseudogap in cuprate high-temperature superconductors, namely the existence or absence of Fermi arcs in the one-band Hubbard model. We study the behavior of the Fermi surface and of the density of states as a function of hole doping for clusters of up to 64 sites, well beyond the reach of modern exact diagonalization solvers. We observe that the technique reliably captures the transition from a Mott insulator at half filling to a pseudogap, evidenced by the formation of Fermi arcs, and finally to a metallic state at large doping. The ability to treat large clusters with quantum cluster methods helps to minimize potential finite size effects and enables the study of systems with long range orders, which will help extend the reach of these already powerful methods and provide important insights on the nature of various strongly correlated many-electron systems, including the high-T$_c$ cuprate superconductors.
description: 13 pages, 8 figures
Supplementary document for Ultra-high sensitivity photonic crystal fiber sensors based on dispersion turning point sensitization of surface plasmonic polariton modes for low RI liquid detection - 7138455.pdf
Creators: name: Wang, Jianxin
name: Lu, Xili
name: Mi, Chao
name: Yin, Qianqian
name: Lv, Jingwei
name: Yang, Lin
name: Liu, Wei
name: Yi, Zao
name: Liu, Qiang
name: Chu, Paul
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Section IV, Supplementary Description of Figure 8
Dissipative magnetic structures and scales in small-scale dynamos
Creators: name: Brandenburg, A.
name: Rogachevskii, I.
name: Schober, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Small-scale dynamos play important roles in modern astrophysics, especially on Galactic and extragalactic scales. Owing to dynamo action, purely hydrodynamic Kolmogorov turbulence hardly exists and is often replaced by hydromagnetic turbulence. Understanding the size of dissipative magnetic structures is important in estimating the time scale of Galactic scintillation and other observational and theoretical aspects of interstellar and intergalactic small-scale dynamos. Here we show that, during the kinematic phase of the small-scale dynamo, the cutoff wavenumber of the magnetic energy spectra scales as expected for large magnetic Prandtl numbers, but continues in the same way also for moderately small values - contrary to what is expected. For a critical magnetic Prandtl number of about 0.3, the dissipative and resistive cutoffs are found to occur at the same wavenumber. In the nonlinearly saturated regime, the critical magnetic Prandtl number becomes unity. The cutoff scale now has a shallower scaling with magnetic Prandtl number below a value of about three, and a steeper one otherwise compared to the kinematic regime.
description: 9 pages, 12 figures, 4 tables, submitted to MNRAS, revised version
Multiscale analysis of the CMB temperature derivatives
Creators: name: Marcos-Caballero, A.
name: Martínez-González, E.
name: Vielva, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the Planck CMB temperature at different scales through its derivatives up to second order, which allows one to characterize the local shape and isotropy of the field. The problem of having an incomplete sky in the calculation and statistical characterization of the derivatives is addressed in the paper. The analysis confirms the existence of a low variance in the CMB at large scales, which is also noticeable in the derivatives. Moreover, deviations from the standard model in the gradient, curvature and the eccentricity tensor are studied in terms of extreme values on the data. As it is expected, the Cold Spot is detected as one of the most prominent peaks in terms of curvature, but additionally, when the information of the temperature and its Laplacian are combined, another feature with similar probability at the scale of $10^\circ$ is also observed. However, the $p$-value of these two deviations increase above the $6\%$ when they are referred to the variance calculated from the theoretical fiducial model, indicating that these deviations can be associated to the low variance anomaly. Finally, an estimator of the directional anisotropy for spinorial quantities is introduced, which is applied to the spinors derived from the field derivatives. An anisotropic direction whose probability is $<1\%$ is detected in the eccentricity tensor.
Heavy fermion representation for twisted bilayer graphene systems
Creators: name: Shi, Hao
name: Dai, Xi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We construct a heavy fermion representation for twisted bilayer graphene (TBG) systems. Two local orbitals (per spin/valley) are analytically found, which are exactly the maximally localized zero modes of the continuum Hamiltonian near the AA-stacking center. They have similar properties to the Wannier functions in [arXiv:2111.05865v2], but also have a clear interpretation as the zeroth pseudo Landau levels (ZLL) of Dirac fermions under the uniform strain field created by twisting [arXiv:1810.03103v3]. The electronic states of TBG can be viewed as the hybridization between these ZLL orbitals and other itinerant states which can be obtained following the standard procedure of orthogonalized plane wave method. The "heavy fermion" model for TBG separates the strongly correlated components from the itinerant components and provides a solid base for the comprehensive understanding of the exotic physics in TBG.
Fluctuation of Dynamical Robustness in a Networked Oscillators System
Creators: name: Huang, Wenwen
name: Zhang, Xiyun
name: Hu, Xin
name: Liu, Zonghua
name: Guan, Shuguang
Publisher: name: arXiv
Year: 2017
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this work, we study the dynamical robustness in a system consisting of both active and inactive oscillators. We analytically show that the dynamical robustness of such system is determined by the cross link density between active and inactive subpopulations, which depends on the specific process of inactivation. It is the multi-valued dependence of the cross link density on the control parameter, i.e., the ratio of inactive oscillators in the system, that leads to the fluctuation of the critical points. We further investigate how different network topologies and inactivation strategies affect the fluctuation. Our results explain why the fluctuation is more obvious in heterogeneous networks than in homogeneous ones, and why the low-degree nodes are crucial in terms of dynamical robustness. The analytical results are supported by numerical verifications.
Measurement of single nanoparticle anisotropy by laser induced optical alignment and Rayleigh scattering for determining particle morphology
Creators: name: Rademacher, Markus
name: Gosling, Jonathan
name: Pontin, Antonio
name: Toroš, Marko
name: Mulder, Jence T.
name: Houtepen, Arjan J.
name: Barker, P. F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate the measurement of nanoparticle shape by angularly resolved Rayleigh scattering of single optical levitated particles that are oriented in space via the trapping light in vacuum. This technique is applied to a range of particle geometries, from perfect spherical nanodroplets to octahedral nanocrystals. We show that this method can resolve shape differences down to a few nanometers and be applied in both low-damping environments, as demonstrated here, and in traditional overdamped fluids used in optical tweezers.
description: 5 pages, 4 figures
Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study
Creators: name: Moshkina, Evgeniya
name: Ritter, Clemens
name: Eremin, Evgeniy
name: Sofronova, Svetlana
name: Kartashev, Andrey
name: Dubrovskiy, Andrey
name: Bezmaternykh, Leonard
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We report on the thermodynamic, magnetic properties and the magnetic structure of ludwigite-type Cu2MnBO5. The specific heat, the low-field magnetization and the paramagnetic susceptibility were studied on a single crystal and combined with powder neutron diffraction data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal a single magnetic phase transition at T=92 K, which corresponds to the magnetic ordering into a ferromagnetic phase. The cation distribution and the values and directions of magnetic moments of ions in different crystallographic sites are established. The magnetic moments of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are pairwise antiparallel and their directions do not coincide with the directions of the principal crystallographic axes.The small value of the magnetic moment of copper ions occupying site 2a is indicative of partial disordering of the magnetic moments on this site. The magnetization measurements show a strong temperature hysteresis of magnetization, which evidences for field-dependent transitions below the phase transition temperature.
description: 15 pages, 10 figures
Sign-changing non-monotonic voltage gain of HfO2/Parylene-C/SrTiO3 field-effect transistor due to percolative insulator to two-dimensional metal transition
Creators: name: Schulman, Alejandro
name: Kitoh, Ai
name: Stoliar, Pablo
name: Inoue, Isao H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Controlling the insulator-to-2D-metal transition is a promising key to overcome the scaling problem that silicon-based electronic devices will face in the near future. In this context, we examine the channel formation of SrTiO3-based solid-gated field-effect devices in which a 2D metal phase coexists with a semiconductor phase. A non-monotonic voltage-gain transfer characteristic with negative and positive slope regions is observed. We introduce a numerical model that helps to rationalize the experimental findings in terms of the established physics of field-effect transistors and percolation. Our numerical study not only reproduces the experimental results but also provides non-trivial predictions, which we verify experimentally.
Exploring bile acids changes and microflora profile in chicken fatty liver disease model
Creators: name: Lin, Yuan-Yu
Publisher: name: Zenodo
Year: 2023
Subjects: non-alcoholic fatty liver
bile acids
cecal microbiota
high-cholesterol low-choline diet

description: This study unveils bile acid and microflora changes in a chicken NAFLD model, enhancing our understanding of fatty liver disease metabolism and aiding targeted interventions.
Advanced POD-Based Performance Evaluation of Classifiers Applied to Human Driver Lane Changing Prediction
Creators: name: Rastin, Zahra
name: Söffker, Dirk
Publisher: name: arXiv
Year: 2024
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Machine learning (ML) classifiers serve as essential tools facilitating classification and prediction across various domains. The performance of these algorithms should be known to ensure their reliable application. In certain fields, receiver operating characteristic and precision-recall curves are frequently employed to assess machine learning algorithms without accounting for the impact of process parameters. However, it may be essential to evaluate the performance of these algorithms in relation to such parameters. As a performance evaluation metric capable of considering the effects of process parameters, this paper uses a modified probability of detection (POD) approach to assess the reliability of ML-based algorithms. As an example, the POD-based approach is employed to assess ML models used for predicting the lane changing behavior of a vehicle driver. The time remaining to the predicted (and therefore unknown) lane changing event is considered as process parameter. The hit/miss approach to POD is taken here and modified by considering the probability of lane changing derived from ML algorithms at each time step, and obtaining the final result of the analysis accordingly. This improves the reliability of results compared to the standard hit/miss approach, which considers the outcome of the classifiers as either 0 or 1, while also simplifying evaluation compared to the â versus a approach. Performance evaluation results of the proposed approach are compared with those obtained with the standard hit/miss approach and a pre-developed â versus a approach to validate the effectiveness of the proposed method. The comparison shows that this method provides an averaging conservative behavior with the advantage of enhancing the reliability of the hit/miss approach to POD while retaining its simplicity.
description: Manuscript: 8 pages, 6 figures, 4 tables
First-principles superadiabatic theory for the dynamics of inhomogeneous fluids
Creators: name: Tschopp, S. M.
name: Brader, J. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: For classical many-body systems subject to Brownian dynamics we develop a superadiabatic dynamical density functional theory (DDFT) for the description of inhomogeneous fluids out-of-equilibrium. By explicitly incorporating the dynamics of the inhomogeneous two-body correlation functions we obtain superadiabatic forces directly from the microscopic interparticle interactions. We demonstrate the importance of these nonequilibrium forces for an accurate description of the one-body density by numerical implementation of our theory for three-dimensional hard-spheres in a time-dependent planar potential. The relaxation of the one-body density in superadiabatic-DDFT is found to be slower than that predicted by standard adiabatic DDFT and significantly improves the agreement with Brownian dynamics simulation data. We attribute this improved performance to the correct treatment of structural relaxation within the superadiabatic-DDFT. Our approach provides fundamental insight into the underlying structure of dynamical density functional theories and makes possible the study of situations for which standard approaches fail.
I-SPLIT: Deep Network Interpretability for Split Computing
Creators: name: Cunico, Federico
name: Capogrosso, Luigi
name: Setti, Francesco
name: Carra, Damiano
name: Fummi, Franco
name: Cristani, Marco
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This work makes a substantial step in the field of split computing, i.e., how to split a deep neural network to host its early part on an embedded device and the rest on a server. So far, potential split locations have been identified exploiting uniquely architectural aspects, i.e., based on the layer sizes. Under this paradigm, the efficacy of the split in terms of accuracy can be evaluated only after having performed the split and retrained the entire pipeline, making an exhaustive evaluation of all the plausible splitting points prohibitive in terms of time. Here we show that not only the architecture of the layers does matter, but the importance of the neurons contained therein too. A neuron is important if its gradient with respect to the correct class decision is high. It follows that a split should be applied right after a layer with a high density of important neurons, in order to preserve the information flowing until then. Upon this idea, we propose Interpretable Split (I-SPLIT): a procedure that identifies the most suitable splitting points by providing a reliable prediction on how well this split will perform in terms of classification accuracy, beforehand of its effective implementation. As a further major contribution of I-SPLIT, we show that the best choice for the splitting point on a multiclass categorization problem depends also on which specific classes the network has to deal with. Exhaustive experiments have been carried out on two networks, VGG16 and ResNet-50, and three datasets, Tiny-Imagenet-200, notMNIST, and Chest X-Ray Pneumonia. The source code is available at https://github.com/vips4/I-Split.
description: ICPR 2022
Cooperative Raman Spectroscopy for Real-time In Vivo Nano-biosensing
Creators: name: Guo, Hongzhi
name: Jornet, Josep Miquel
name: Gan, Qiaoqiang
name: Sun, Zhi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In the last few decades, the development of miniature biological sensors that can detect and measure different phenomena at the nanoscale has led to transformative disease diagnosis and treatment techniques. Among others, biofunctional Raman nanoparticles have been utilized in vitro and in vivo for multiplexed diagnosis and detection of different biological agents. However, existing solutions require the use of bulky lasers to excite the nanoparticles and similarly bulky and expensive spectrometers to measure the scattered Raman signals, which limit the practicality and applications of this nano-biosensing technique. In addition, due to the high path loss of the intra-body environment, the received signals are usually very weak, which hampers the accuracy of the measurements. In this paper, the concept of cooperative Raman spectrum reconstruction for real-time in vivo nano-biosensing is presented for the first time. The fundamental idea is to replace the single excitation and measurement points (i.e., the laser and the spectrometer, respectively) by a network of interconnected nano-devices that can simultaneously excite and measure nano-biosensing particles. More specifically, in the proposed system a large number of nanosensors jointly and distributively collect the Raman response of nano-biofunctional nanoparticles (NBPs) traveling through the blood vessels. This paper presents a detailed description of the sensing system and, more importantly, proves its feasibility, by utilizing accurate models of optical signal propagation in intra-body environment and low-complexity estimation algorithms. The numerical results show that with a certain density of NBPs, the reconstructed Raman spectrum can be recovered and utilized to accurately extract the targeting intra-body information.
Magnetic Phases of Spatially-Modulated Spin-1 Chains in Rydberg Excitons: Classical and Quantum Simulations
Creators: name: Sajjan, Manas
name: Alaeian, Hadiseh
name: Kais, Sabre
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work, we study the magnetic phases of a spatially-modulated chain of spin-1 Rydberg excitons. Using the Density Matrix Renormalization Group (DMRG) technique we study various magnetic and topologically nontrivial phases using both single-particle properties like local magnetization and quantum entropy as well as many-body ones like pair-wise Néel and long-range string correlations. In particular, we investigate the emergence and robustness of Haldane phase, a topological phase of anti-ferromagnetic spin-1 chains. Further, we devise a hybrid quantum algorithm employing Restricted Boltzmann Machine to simulate the ground state of such a system which shows very good agreement with the results of exact diagonalization (ED) and DMRG.
Transport and optics at the node in a nodal loop semimetal
Creators: name: Mukherjee, S. P.
name: Carbotte, J. P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use a Kubo formalism to calculate both A.C. conductivity and D.C. transport properties of a dirty nodal loop semimetal. The optical conductivity as a function of photon energy $Ω$, exhibits an extended flat background $σ^{BG}$ as in graphene provided the scattering rate $Γ$ is small as compared to the radius of the nodal ring $b$ (in energy units). Modifications to the constant background arise for $Ω\le Γ$ and the minimum D.C. conductivity $σ^{DC} $ which is approached as $Ω^2/Γ^2$ as $Ω\rightarrow0$, is found to be proportional to $\frac{\sqrt{Γ^2+b^2}}{v_{F}}$ with $v_{F}$ the Fermi velocity. For $b=0$ we recover the known three-dimensional point node Dirac result $σ^{DC}\sim \fracΓ{v_{F}}$ while for $b>Γ$, $σ^{DC}$ becomes independent of $Γ$ (universal) and the ratio $\frac{σ^{DC}}{σ^{BG}}=\frac{8}{π^2}$ where all reference to material parameters has dropped out. As $b$ is reduced and becomes of the order $Γ$, the flat background is lost as the optical response evolves towards that of a three-dimensional point node Dirac semimetal which is linear in $Ω$ for the clean limit. For finite $Γ$ there are modifications from linearity in the photon region $Ω\le Γ$. When the chemical potential $μ$ (temperature $T$) is nonzero the D.C. conductivity increases as $μ^2/Γ^2$($T^2/Γ^2$) for $μ/Γ$ $(T/Γ)\le 1$. For larger values of $μ>Γ$ away from the nodal region the conductivity shows a Drude like contribution about $Ω\approxeq 0$ which is followed by a dip in the Pauli blocked region $Ω\le 2μ$ after which it increases to merge with the flat background (two-dimensional graphene like) for $μ< b$ and to the quasilinear (three-dimensional point node Dirac) law for $μ> b$.
description: 11 pages, 9 figures, accepted in Phys. Rev. B
Show, Attend and Interact: Perceivable Human-Robot Social Interaction through Neural Attention Q-Network
Creators: name: Qureshi, Ahmed Hussain
name: Nakamura, Yutaka
name: Yoshikawa, Yuichiro
name: Ishiguro, Hiroshi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: For a safe, natural and effective human-robot social interaction, it is essential to develop a system that allows a robot to demonstrate the perceivable responsive behaviors to complex human behaviors. We introduce the Multimodal Deep Attention Recurrent Q-Network using which the robot exhibits human-like social interaction skills after 14 days of interacting with people in an uncontrolled real world. Each and every day during the 14 days, the system gathered robot interaction experiences with people through a hit-and-trial method and then trained the MDARQN on these experiences using end-to-end reinforcement learning approach. The results of interaction based learning indicate that the robot has learned to respond to complex human behaviors in a perceivable and socially acceptable manner.
description: 7 pages, 5 figures, accepted by IEEE-RAS ICRA'17
Frequency shaping control for weakly-coupled grid-forming IBRs
Creators: name: Poolla, Bala Kameshwar
name: Lin, Yashen
name: Bernstein, Andrey
name: Mallada, Enrique
name: Groß, Dominic
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We consider the problem of controlling the frequency of low-inertia power systems via inverter-based resources (IBRs) that are weakly connected to the grid. We propose a novel grid-forming control strategy, the so-called frequency shaping control, that aims to shape the frequency response of synchronous generators (SGs) to load perturbations so as to efficiently arrest sudden frequency drops. Our solution relaxes several existing assumptions in the literature and is able to navigate tradeoffs between peak power requirements and maximum frequency deviations. Finally, we analyze the robustness to imperfect knowledge of network parameters, while particularly highlighting the importance of accurate estimation of these parameters.
Local properties of the large-scale peaks of the CMB temperature
Creators: name: Marcos-Caballero, A.
name: Martínez-González, E.
name: Vielva, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In the present work, we study the largest structures of the CMB temperature measured by Planck in terms of the most prominent peaks on the sky, which, in particular, are located in the southern galactic hemisphere. Besides these large-scale features, the well-known Cold Spot anomaly is included in the analysis. All these peaks would contribute significantly to some of the CMB large-scale anomalies, as the parity and hemispherical asymmetries, the dipole modulation, the alignment between the quadrupole and the octopole, or in the case of the Cold Spot, to the non-Gaussianity of the field. The analysis of the peaks is performed by using their multipolar profiles, which characterize the local shape of the peaks in terms of the discrete Fourier transform of the azimuthal angle. In order to quantify the local anisotropy of the peaks, the distribution of the phases of the multipolar profiles is studied by using the Rayleigh random walk methodology. Finally, a direct analysis of the 2-dimensional field around the peaks is performed in order to take into account the effect of the galactic mask. The results of the analysis conclude that, once the peak amplitude and its first and second order derivatives at the centre are conditioned, the rest of the field is compatible with the standard model. In particular, it is observed that the Cold Spot anomaly is caused by the large value of curvature at the centre.
The Type II Dirac Seesaw Portal to the mirror sector: Connecting neutrino masses and a solution to the strong CP problem
Creators: name: Berbig, Maximilian
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a version of the Type II Seesaw mechanism for parametrically small Dirac neutrino masses. Our model starts from an $\text{SU}(2)_\text{L} \otimes \text{SU}(2)'\otimes \text{U}(1)_\text{X}$ gauge extension of the Standard Model involving a sector of mirror fermions. A bidoublet scalar with a very small vacuum expectation value connects the SM leptons with their mirror counterparts and we can identify the mirror neutrino with the right-handed neutrino. Similar to the conventional Type II Seesaw, our particle spectrum features singly- and doubly-charged scalars. The strong CP problem is solved by a discrete exchange symmetry between the two sectors that forces the contributions of quarks and mirror quarks to the strong CP phase to cancel each other. We discuss the low-energy phenomenology, comment on the cosmological implications of this scenario and indicate how to realize successful Dirac leptogenesis.
description: version 1: 8 pages + 2 pages of appendices, comments always welcome!, version 2: 10 pages + 6 pages of appendices, details and clarifications added, layout optimized, matches published version
Absorption of circular polarized light in tilted Type-I and II Weyl semimetals
Creators: name: Mukherjee, S. P.
name: Carbotte, J. P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the A.C. optical response to circularly polarized light of a Weyl semimetal (WSM) with varying amounts of tilt of the Dirac cones. Both type-I and II (overtilted) WSM are considered in a continuum model with broken time reversal (TR) symmetry. The Weyl nodes appear in pairs of equal energies but of opposite momentum and chirality. For type-I the response of a particular node to right (RHP) and left (LHP) hand polarized light are distinct only in a limited range of photon energy $Ω$, $\frac{2}{1+C_{2}/v}
description: 9 pages 7 figures
Exploiting dissipative reactions to perform in-beam $γ$-ray spectroscopy of the neutron-deficient isotopes \nuc{38,39}{Ca}
Creators: name: Gade, A.
name: Weisshaar, D.
name: Brown, B. A.
name: Bazin, D.
name: Brown, K. W.
name: Charity, R. J.
name: Farris, P.
name: Hill, A. M.
name: Li, J.
name: Longfellow, B.
name: Rhodes, D.
name: Reviol, W.
name: Tostevin, J. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The neutron-deficient Ca isotopes continue to attract attention due to their importance for testing isospin symmetry and their relevance in capture reactions of interest for nova nucleosynthesis and the shape of light curves in Type I X-ray bursts. To date, spectroscopic information on 38,39 Ca is largely limited to data on lower-spin excited states. Here, we report in-beam γ-ray spectroscopy of complementary higher-spin, complex-structure states in 39 Ca populated in fast-beam-induced, momentum-dissipative processes leading to neutron pickup onto excited configurations of the projectile, 9 Be(38 Ca , 39 Ca + γ)X. Such a dissipative reaction was recently characterized for the case of inelastic scattering of 38 Ca off 9 Be, 9 Be(38 Ca, 38 Ca + γ)X. Additional data and discussion on the nuclear structure of 38 Ca is also presented. An explanation for the more-complex-structure states, populated with small cross sections in one-nucleon knockout reactions, and observed in the tails of their longitudinal momentum distributions, is also offered.
description: Submitted to Phys. Rev. C
title: Δημιουργία εταιρικής ταυτότητας σε έντυπη και ψηφιακή μορφή ενός στούντιο τατουάζ
title: Creation of corporate identity in print and digital form of a tattoo studio
titleType: AlternativeTitle
Creators: name: Κοκόλη, Νικολέττα
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Τατουάζ
Βελόνες

description: Δημιουργία εταιρικής ταυτότητας σε έντυπη και ψηφιακή μορφή ενός στούντιο τατουάζ
The stabilization of high-order multistep schemes for the Laguerre one-way wave equation solver
Creators: name: Terekhov, Andrew V.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper considers spectral-difference methods of a high-order of accuracy for solving the one-way wave equation using the Laguerre integral transform with respect to time as the base. In order to provide a high spatial accuracy and calculation stability, the Richardson method can be employed. However such an approach requires high computer costs, therefore we consider alternative algorithms based on the Adams multistep schemes. To reach the stability first for the 1D one-way equation and then for the 2D case, the stabilizing procedures using the spline interpolation were developed. This made possible to efficiently implement a predictor-corrector type method in terms of which a boundary value problem for high-order elliptic equations is substituted for a sequence of inversions of second order elliptic operators thus decreasing computer costs. To assess the accuracy and stability of difference approximations for the 1D one-way wave equation, the analytical solution based on the double Laguerre transform was obtained. This solution can be efficiently calculated if for summation one makes use of fast algorithms of computing a discrete linear convolution. For the 2D one-way wave equation the stability and accuracy of the procedures proposed have been studied on implementing the migration algorithm within a problem of seismic prospecting.
description: In Russian. arXiv admin note: substantial text overlap with arXiv:1605.03292
title: Αντιλήψεις εκπαιδευτικών πρωτοβάθμιας και δευτεροβάθμιας εκπαίδευσης σχετικά με τη συμπερίληψη/ένταξη των μαθητών στο φάσμα του αυτισμού στα σχολεία γενικής παιδείας.
title: Perceptions of teachers of primary and secondary education regarding the inclusion of students in the autism spectrum in general education schools.
titleType: AlternativeTitle
Creators: name: Καούρη, Σοφία
Publisher: name: Πανεπιστήμιο Πελοποννήσου
Year: 2022
Subjects: subject: Αυτισμός στα παιδιά
subject: Ενταξιακή εκπαίδευση
subject: Ενσωμάτωση στην εκπαίδευση
subject: Παιδιά με μαθησιακές δυσκολίες - Εκπαίδευση
subject: Επικοινωνιακές διαταραχές στα παιδιά
subject: Παιδιά με ειδικές ανάγκες - Εκπαίδευση
subject: Autism in children
subject: Inclusive education
subject: Mainstreaming in education
subject: Learning disabled children - Education
subject: Commubnicative disorders in children
subject: Children with disabilities - Education
subject: Συνεκπαίδευση
subject: Εκπαιδευτικός
subject: Διαταραχές Αυτιστικού Φάσματος
subject: Σχολείο
subject: Γενική Εκπαίδευση
subject: Inclusive Education
subject: Teacher
subject: Autism Spectrum Disorders
subject: School
subject: General Education

description: Σκοπός της παρούσας εργασίας είναι να αναζητηθούν οι ιδέες και οι αντιλήψεις των εκπαιδευτικών για τη συνεκπαίδευση παιδιών με αυτισμό στα σχολεία γενικής παιδείας. Σε θεωρητικό επίπεδο παρουσιάστηκε η συμπερίληψη, οι Διαταραχές Αυτιστικού Φάσματος και η έννοια της παράλληλης στήριξης. Επίσης, ο κρίσιμος ρόλος του περιβάλλοντος ενός παιδιού με αυτισμό και οι υπάρχουσες έρευνες για τη συμπερίληψη αυτών στα σχολεία γενικής παιδείας. Στο ερευνητικό μέρος της μελέτης συντάχθηκε ερωτηματολόγιο, από τα αποτελέσματα του οποίου διαφάνηκε πως το γονεϊκό περιβάλλον επιθυμεί τη φοίτηση του παιδιού του στη γενική εκπαίδευση. Γεγονός ιδιαιτέρως δύσκολο, αφού οι εκπαιδευτικοί κατά τη διάρκεια της ακαδημαϊκής τους φοίτησης δεν αποκτούν τα απαραίτητα εφόδια, για να είναι σε θέση να καλύπτουν τις απαιτήσεις των παιδιών με αυτισμό και ταυτόχρονα όλη τη διαδικασία της συνεκπαίδευσης οφείλει να εκσυγχρονιστεί και να βελτιωθεί άμεσα. Ωστόσο, παρά την προβληματική και τη δυνατότητα περαιτέρω βελτίωσης, η συνεκπαίδευση παιδιών με αυτισμό στα σχολεία προάγει την ατομική εξέλιξη, την κοινωνική ανεξαρτητοποίηση και την αυτοεκτίμηση των αυτιστικών παιδιών και συνάμα την αναγνώριση της ιδιαιτερότητας και της διαφορετικότητας από το σύνολο της σχολικής τάξης. Το δείγμα της έρευνας αποτέλεσαν 110 εκπαιδευτικοί πρωτοβάθμιας και δευτεροβάθμιας εκπαίδευσης και επικεντρώθηκε στο νομό Αχαίας.
High-Order harmonics of Thermal Tides observed in the atmosphere of Mars by the Pressure Sensor on the Insight lander
Creators: name: Hernandez-Bernal, J.
name: Spiga, A.
name: Forget, F.
name: Banfield, D.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Thermal tides are atmospheric planetary-scale waves with periods that are harmonics of the solar day. In the Martian atmosphere thermal tides are known to be especially significant compared to any other known planet. Based on the data set of pressure timeseries produced by the InSight lander, which is unprecedented in terms of accuracy and temporal coverage, we investigate thermal tides on Mars and we find harmonics even beyond the number 24, which exceeds significantly the number of harmonics previously reported by other works. We explore comparatively the characteristics and seasonal evolution of tidal harmonics and find that even and odd harmonics exhibit some clearly differentiated trends that evolve seasonally and respond to dust events. High-order tidal harmonics with small amplitudes could transiently interfere constructively to produce meteorologically relevant patterns.
Searching for dilaton fields in the Ly$α$ forest
Creators: name: Hamaide, Louis
name: Müller, Hendrik
name: Marsh, David J. E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dilatons (and moduli) couple to the masses and coupling constants of ordinary matter, and these quantities are fixed by the local value of the dilaton field. If, in addition, the dilaton with mass $m_ϕ$ contributes to the cosmic dark matter density, then such quantities oscillate in time at the dilaton Compton frequency. We show how these oscillations lead to broadening and shifting of the Voigt profile of the Ly$α$ forest, in a manner that is correlated with the local dark matter density. We further show how tomographic methods allow the effect to be reconstructed by observing the Ly$α$ forest spectrum of distant quasars. We then simulate a large number of quasar lines of sight using the lognormal density field, and forecast the ability of future astronomical surveys to measure this effect. We find that in the ultra low mass range $10^{-32}\text{ eV}\leq m_ϕ\leq 10^{-28}\text{ eV}$ upcoming observations can improve over existing limits to the dilaton electron mass and fine structure constant couplings set by fifth force searches by up to five orders of magnitude. Our projected limits apply assuming that the ultralight dilaton makes up a few percent of the dark matter density, consistent with upper limits set by the cosmic microwave background anisotropies.
description: 22 pages, 9 figures, 1 table
Improving Colour Computations in MadGraph5_aMC@NLO and Exploring a 1/Nc Expansion
Creators: name: Lifson, Andrew
name: Mattelaer, Olivier
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to $2\to 6$ (one more particle than before). To achieve this, we implemented Berends-Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1/Nc and truncate this expansion to a chosen order. For high multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.
description: Published version in EPJC. Minor changes to v1. 18 pages, 18 figures
Ecohydrology and ecosystem services of a natural and an artificial bofedal wetland in the central Andes
Creators: name: Monge-Salazar, María J.
name: Tovar, Carolina
name: Cuadros-Adriazola, Jose
name: Baiker, Jan R.
name: Montesinos-Tubée, Daniel B.
name: Bonnesoeur, Vivien
name: Antiporta, Javier
name: Román-Dañobeytia, Francisco
name: Fuentealba, Beatriz
name: Ochoa-Tocachi, Boris F.
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Carbon accumulation
subject: Fodder provision
subject: Tropical high-altitude wetlands
subject: Wetland management and restoration
subject: Alpaca herders
subject: Water security
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: High-altitude wetlands of the Central Andes, locally known as bofedales, provide important ecosystem services, particularly carbon storage, forage provisioning, and water regulation. Local communities have artificially expanded bofedales by irrigating surrounding grasslands to maximise areas for alpaca grazing. Despite their importance, biophysical processes of both natural and artificial bofedales are still poorly studied, which hinders the development of adequate management and conservation strategies. We analyse and compare the vegetation composition, hydrological variables, groundwater chemistry, and soil characteristics of a natural and an artificial bofedal of at least 10 years old in southern Peru, to understand their interrelations and the consequences for ecosystem service provisioning. We do not find statistically significant differences in the soil, water, and vegetation characteristics. Soil organic carbon (SOC) content, which we use as a proxy for carbon storage, is negatively correlated to dissolved oxygen, pH, and soil water temperature. In addition, Non-Metric Multidimensional Scaling analysis shows a positive relation between plant community composition, SOC content, and water electric conductivity. Our results suggest a three-way interaction between hydrological, soil, and vegetation characteristics in the natural bofedal, which also holds for the artificial bofedal. Vegetation cover of two of the most highly nutritious species for alpaca, Lachemilla diplophylla and Lilaeopsis macloviana with 19–22% of crude protein, are weakly or not correlated to environmental variables, suggesting grazing might be obscuring these potential relationships. Given the high economic importance of alpaca breeding for local communities, expanding bofedales artificially appears an effective strategy to enhance their ecosystem services with minimal impact on the ecohydrological properties of bofedales.