cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
EVStabilityNet: Predicting the Stability of Star Clusters in General Relativity
Creators: name: Straub, Christopher
name: Wolfschmidt, Sebastian
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a deep neural network which predicts the stability of isotropic steady states of the asymptotically flat, spherically symmetric Einstein-Vlasov system in Schwarzschild coordinates. The network takes as input the energy profile and the redshift of the steady state. Its architecture consists of a U-Net with a dense bridge. The network was trained on more than ten thousand steady states using an active learning scheme and has high accuracy on test data. As first applications, we analyze the validity of physical hypotheses regarding the stability of the steady states.
description: 16 pages, 4 figures
An MDP Model for Censoring in Harvesting Sensors: Optimal and Approximated Solutions
Creators: name: Fernandez-Bes, Jesus
name: Cid-Sueiro, Jesus
name: Marques, Antonio G.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we propose a novel censoring policy for energy-efficient transmissions in energy-harvesting sensors. The problem is formulated as an infinite-horizon Markov Decision Process (MDP). The objective to be optimized is the expected sum of the importance (utility) of all transmitted messages. Assuming that such importance can be evaluated at the transmitting node, we show that, under certain conditions on the battery model, the optimal censoring policy is a threshold function on the importance value. Specifically, messages are transmitted only if their importance is above a threshold whose value depends on the battery level. Exploiting this property, we propose a model-based stochastic scheme that approximates the optimal solution, with less computational complexity and faster convergence speed than a conventional Q-learning algorithm. Numerical experiments in single-hop and multi-hop networks confirm the analytical advantages of the proposed scheme.
Understanding of Land and Building Taxpayers, Fang Daeng Subdistrict, Na Klang District, Nong Bua Lamphu Province.
Creators: name: Mananya Thongbor
Publisher: name: Nakhon Phanom University
Year: 2022
Subjects: Understanding
land and building tax
regulations
land and buildings Tax Act,BE 2019

description: Journal of Engineering Technology Access, 2, 2, 44-57
Subperiosteal Osteoid Osteoma in the Coronoid Fossa Mimicking EarlSubperiosteal Osteoid Osteoma in the Coronoid Fossa Mimicking Early Elbow Arthropathy: A Case Reporty Elbow Arthropathy: A Case Report
Creators: name: Dharmshaktu, Ganesh Singh
name: Agarwal, Naveen
name: Dharmshaktu, Ishwar Singh
name: Agarwal, Anant
name: Pangtey, Tanuja
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 320216
subject: Orthopaedics

description: Introduction:The elbow pain and restricted movement is a nagging problem and elbow arthropathies need to be excluded. On rare instances, uncommon etiology like a benign lesion is the culprit and the diagnosis would require judicious clinicoradiological correlation. Osteoid osteoma in the intra- or juxta-articular region is reported in the literature as rare, sporadic report.Case Report:A 23-year-old, Indian male patient presented with a provisional diagnosis of early elbow arthropathy on account of unexplained pain and restricted elbow movement without a history of trauma. He was subjected to appropriate investigations revealing synovial hypertrophy, effusion, and bone edema suggestive of early arthropathy. Additional imaging led to an uncommon definitive diagnosis. An intra-articular osteoid osteoma was found over the medial aspect of the coronoid fossa with a thin rim of cortical rim projecting anteriorly. The lesion was diagnosed and delineated on computerized tomography and an open excision of the lesion and synovectomy was done for histopathological evaluation. Histology confirmed the presence of an osteoid osteoma at an uncommon location.Conclusion:The careful appreciation of radiological images is critical to not miss significant etiology that may mimic non-specific elbow pain. High index of suspicion coupled with appropriate diagnostic imaging results in early diagnosis and appropriate management. Osteoid osteoma should be a differential diagnosis in cases with pain and restricted elbow movement and excision of which results in recovery of painless range of motion.
Shedding Light on Low Surface Brightness Galaxies in Dark Energy Survey with Transformers
Creators: name: Thuruthipilly, H.
name: Junais
name: Pollo, A.
name: Sureshkumar, U.
name: Grespan, M.
name: Sawant, P.
name: Malek, K.
name: Zadrozny, A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Low surface brightness galaxies (LSBGs) which are defined as galaxies that are fainter than the night sky, play a crucial role in understanding galaxy evolution and cosmological models. Upcoming large-scale surveys like Rubin Observatory Legacy Survey of Space and Time (LSST) and Euclid are expected to observe billions of astronomical objects. In this context, using semi-automatic methods to identify LSBGs would be a highly challenging and time-consuming process and demand automated or machine learning-based methods to overcome this challenge. We study the use of transformer models in separating LSBGs from artefacts in the data from the Dark Energy Survey (DES) data release 1. Using the transformer models, we then search for new LSBGs from the DES that the previous searches may have missed. Properties of the newly found LSBGs are investigated, along with an analysis of the properties of the total LSBG sample in DES. We identified 4,083 new LSBGs in DES, adding an additional $\sim17\% $ to the LSBGs already known in DES. This also increased the number density of LSBGs in DES to 5.5 deg$^{-2}$. We performed a clustering analysis of the LSBGs in DES using an angular two-point auto-correlation function and found that LSBGs cluster more strongly than their high surface brightness counterparts. We associated 1310 LSBGs with galaxy clusters and identified 317 among them as ultra-diffuse galaxies (UDGs). We found that these cluster LSBGs are getting bluer and larger in size towards the edge of the clusters when compared with those in the centre. Transformer models have the potential to be on par with convolutional neural networks as state-of-the-art algorithms in analysing astronomical data.
description: 23 pages, 24 Figures and 4 Tables. Accepted for publication in A&A
Temperature Dependence of the Effective Interdimeric Exchange Interaction in a Weakly Coupled Antiferromagnetic Dimeric Copper Compound
Creators: name: Calvo, Rafael
name: Santana, Vinicius T.
name: Nascimento, Otaciro R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a variation with temperature ($T$) of the effective interdimeric interaction $J^\prime_{\mathrm{eff}}$ in the antiferromagnetic (AFM) copper dimeric organic compound Cu$_2$[TzTs]$_4$ [N-thiazol-2-yl-toluenesulfonamidate Cu$^\mathrm{II}$]. This $T$ dependence was obtained from measurements of the effects in the electron paramagnetic resonance (EPR) spectra of the proposed quantum phase transition associated to the exchange narrowing processes. Cu$_2$[TzTs]$_4$ contains exchange coupled pairs of Cu$^\mathrm{II}$ spins $\mathbf{S_\mathrm{A}}$ and $\mathbf{S_\mathrm{B}}$ ($S$ = 1/2), with intradimeric AFM exchange coupling $J_0$ = (-115$\pm$1) cm$^{-1}$ ($\mathcal{H}_\mathrm{ex} = -J_\mathrm{0} \mathbf{S_\mathrm{A}}\cdot \mathbf{S_\mathrm{B}}$). The variation of the EPR line width of single crystals with field orientation around a "magic angle" where the transitions intersect, as well as the integrated signal intensity of the so-called "U-peak" of the powder spectrum were measured as a function of $T$. Modeling these data using arguments of exchange narrowing in the adiabatic regime considering the angular variation of the single crystal spectra and a geometric description, we find that $|J^\prime_{\mathrm{eff}}|$ associated with the exchange frequency $ω_{ex}$ is negligible for $T<
description: 7 pages, 4 figures, accepted for publication in Physical Review B
Study and solve problems using the educational service system to record grades of Lecturer in the Faculty of Industrial Technology Nakhon Phanom University.
Creators: name: พัชรีภรณ์ ไชยยงค์
Publisher: name: Nakhon Phanom University
Year: 2022
Subjects: Questionnaires
Teacher
Education Service System
Online Video

description: Journal of Engineering Technology Access, 2, 2, 64-81
The online lesson on Infographic Design on website Computer Technology Course 6 using by Computer Package Program to develop learning achievement of Matthayomsuksa 6 students at Chumchon Thetsaban 3 School. (Phinit Phitthayanuson)
Creators: name: กุลธิดา ผ่านพิเคราะห์
Publisher: name: Nakhon Phanom University
Year: 2022
Subjects: online lesson
Infographic
Package Program
Learning achievements

description: Journal of Engineering Technology Access, 2, 2, 82-92
title: Η Διοίκηση ανθρώπινου δυναμικού κατά την οικονομική κρίση 2008-2019 στην Ελλάδα και κατά την εποχή της Πανδημίας Sars CoV-2

title: Personnel Recruitment Department (HR) during the economic crisis of 2008 – 2019 in Greece and during the pandemic of Sars CoV-2
Creators: name: Μητσιου Καλλιοπη-Ελλη
Publisher: name: Technical University of Crete
Year: 2023

description: Στην εργασία αυτή γίνεται εισαγωγή στις έννοιες του Ανθρώπινου Δυναμικού και της Οικονομικής Κρίσης, πως η αμφότερα επηρεάζεται από την οικονομία μιας χώρας και τις ανάγκες που καλείται να καλύψει, και πως σε μια χώρα η οποία έχει πληγεί από μια δεκαετία οικονομικής κρίσης, καλείται να αντιμετωπίσει μια προφανή υγειονομική κρίση. Γίνεται αναφορά τι είναι η Δ.Α.Δ., ποια η σημασία της, τον ρόλο του τμήματος και τον σκοπό που εξυπηρετεί, ενημερωνόμαστε για τις αρμοδιότητες του τμήματος και τον τρόπο με τον οποίο μια επιχείρηση διαλέγει τον υποψήφιο για την κάλυψη μιας θέσης και την εισαγωγή του στο ανθρώπινο δυναμικό της. Καταγράφεται η οικονομική κρίση της Ελλάδας κατά το 2008 – 2019, το ιστορικό των μνημονίων, η νέα νομοθεσία για την αντιμετώπιση του χρέους, η αύξηση της φορολογίας, οι πολιτικές αλλαγές και γίνεται προσέγγιση μιας λύσης ή αποφυγής επανάληψης μιας οικονομικής κρίσης. Ακολουθεί η κρίση της πανδημίας η οποία ξέσπασε το 2019, πως κινήθηκε η πανδημία και πως εν τέλη επηρέασε την καθημερινότητα στον επιχειρηματικό κόσμο. Η νομοθεσία γύρω από την covid-19, δημιούργησε μια συμμαχία κράτους και επιχειρηματιών μέσω προγραμμάτων, ψηφιοποίησης διαδικασιών και οικονομικής στήριξης από το κράτος. Ερευνώντας 5 χαρακτηριστικούς κλάδους, Τουρισμός, Βιομηχανία & Εφοδιαστική αλυσίδα, Τηλεπικοινωνίες, Τράπεζες και Λιανεμπόριο, μελετάμε πως επλήγη κάθε κλάδος από την οικονομική ή πανδημική κρίση, και τον ρόλο που ανέλαβε η Δ.Α.Δ. με σκοπό την ομαλή λειτουργία της επιχείρησης.
Reliable Virtual Machine Placement and Routing in Clouds
Creators: name: Yang, Song
name: Wieder, Philipp
name: Yahyapour, Ramin
name: Trajanovski, Stojan
name: Fu, Xiaoming
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: In current cloud computing systems, when leveraging virtualization technology, the customer's requested data computing or storing service is accommodated by a set of communicated virtual machines (VM) in a scalable and elastic manner. These VMs are placed in one or more server nodes according to the node capacities or failure probabilities. The VM placement availability refers to the probability that at least one set of all customer's requested VMs operates during the requested lifetime. In this paper, we first study the problem of placing at most H groups of k requested VMs on a minimum number of nodes, such that the VM placement availability is no less than $δ$, and that the specified communication delay and connection availability for each VM pair under the same placement group are not violated. We consider this problem with and without Shared-Risk Node Group (SRNG) failures, and prove this problem is NP-hard in both cases. We subsequently propose an exact Integer Nonlinear Program (INLP) and an efficient heuristic to solve this problem. We conduct simulations to compare the proposed algorithms with two existing heuristics in terms of performance. Finally, we study the related reliable routing problem of establishing a connection over at most w link-disjoint paths from a source to a destination, such that the connection availability requirement is satisfied and each path delay is no more than a given value. We devise an exact algorithm and two heuristics to solve this NP-hard problem, and evaluate them via simulations.
description: An extended version of the paper accepted for publication in IEEE Transactions on Parallel and Distributed Systems
Exact Resurgent Trans-series and Multi-Bion Contributions to All Orders
Creators: name: Fujimori, Toshiaki
name: Kamata, Syo
name: Misumi, Tatsuhiro
name: Nitta, Muneto
name: Sakai, Norisuke
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The full resurgent trans-series is found exactly in near-supersymmetric $\mathbb C P^1$ quantum mechanics. By expanding in powers of the SUSY breaking deformation parameter, we obtain the first and second expansion coefficients of the ground state energy. They are absolutely convergent series of nonperturbative exponentials corresponding to multi-bions with perturbation series on those background. We obtain all multi-bion exact solutions for finite time interval in the complexified theory. We sum the classical multi-bion contributions that reproduce the exact result supporting the resurgence to all orders. This is the first result in the quantum mechanical model where the resurgent trans-series structure is verified to all orders in nonperturbative multi-bion contributions.
description: 11 pages, 3 figures, references added, typos corrected, published version
Superadditivity of the Classical Capacity with Limited Entanglement Assistance
Creators: name: Zhu, Elton Yechao
name: Zhuang, Quntao
name: Shor, Peter W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Finding the optimal encoding strategies can be challenging for communication using quantum channels, as classical and quantum capacities may be superadditive. Entanglement assistance can often simplify this task, as the entanglement-assisted classical capacity for any channel is additive, making entanglement across channel uses unnecessary. If the entanglement assistance is limited, the picture is much more unclear. Suppose the classical capacity is superadditive, then the classical capacity with limited entanglement assistance could retain superadditivity by continuity arguments. If the classical capacity is additive, it is unknown if superadditivity can still be developed with limited entanglement assistance. We show this is possible, by providing an example. We construct a channel for which, the classical capacity is additive, but that with limited entanglement assistance can be superadditive. This shows entanglement plays a weird role in communication and we still understand very little about it.
description: 13 pages
Thermoelectric properties of 3D topological insulator: Direct observation of topological surface and its gap opened states
Creators: name: Matsushita, Stephane Yu
name: Huynh, Khuong Kim
name: Yoshino, Harukazu
name: Tu, Ngoc Han
name: Tanabe, Yoichi
name: Tanigaki, Katsumi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report thermoelectric (TE) properties of topological surface Dirac states (TSDS) in three-dimensional topological insulators (3D-TIs) purely isolated from the bulk by employing single crystal Bi$_{2-x}$Sb$_x$Te$_{3-y}$Se$_y$ films epitaxially grown in the ultrathin limit. Two intrinsic nontrivial topological surface states, a metallic TSDS (m-TSDS) and a gap-opened semiconducting topological state (g-TSDS), are successfully observed by electrical transport, and important TE parameters (electrical conductivity ($σ$), thermal conductivity ($κ$), and thermopower ($S$)) are accurately determined. Pure m-TSDS gives $S$=-44 μVK$^{-1}$, which is an order of magnitude higher than those of the conventional metals and the value is enhanced to -212 μVK$^{-1}$ for g-TSDS. It is clearly shown that the semi-classical Boltzmann transport equation (SBTE) in the framework of constant relaxation time ($τ$) most frequently used for conventional analysis cannot be valid in 3D-TIs and strong energy dependent relaxation time $τ(E)$ beyond the Born approximation is essential for making intrinsic interpretations. Although $σ$ is protected on the m-TSDS, $κ$ is greatly influenced by the disorder on the topological surface, giving a dissimilar effect between topologically protected electronic conduction and phonon transport.
description: 15 pages, 4 figures
Less interaction with forward models in Langevin dynamics
Creators: name: Eigel, Martin
name: Gruhlke, Robert
name: Sommer, David
Publisher: name: Weierstrass Institute
Year: 2022
Subjects: subject: Langevin dynamics
subject: interacting particle systems
subject: Bayesian inference
subject: computational optimal transport
subject: Wasserstein distance
subject: mean-field Fokker-Planck equation
subject: homotopy
subject: 65N21
subject: 62F15
subject: 65N75
subject: 65C30
subject: 35Q84
subject: 65K10

description: Ensemble methods have become ubiquitous for the solution of Bayesian inference problems. State-of-the-art Langevin samplers such as the Ensemble Kalman Sampler (EKS), Affine Invariant Langevin Dynamics (ALDI) or its extension using weighted covariance estimates rely on successive evaluations of the forward model or its gradient. A main drawback of these methods hence is their vast number of required forward calls as well as their possible lack of convergence in the case of more involved posterior measures such as multimodal distributions. The goal of this paper is to address these challenges to some extend. First, several possible adaptive ensemble enrichment strategies that successively enlarge the number of particles in the underlying Langevin dynamics are discusses that in turn lead to a significant reduction of the total number of forward calls. Second, analytical consistency guarantees of the ensemble enrichment method are provided for linear forward models. Third, to address more involved target distributions, the method is extended by applying adapted Langevin dynamics based on a homotopy formalism for which convergence is proved. Finally, numerical investigations of several benchmark problems illustrates the possible gain of the proposed method, comparing it to state-of-the-art Langevin samplers.
Using Slisemap to interpret physical data
Creators: name: Seppäläinen, Lauri
name: Björklund, Anton
name: Besel, Vitus
name: Puolamäki, Kai
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Manifold visualisation techniques are commonly used to visualise high-dimensional datasets in physical sciences. In this paper we apply a recently introduced manifold visualisation method, called Slise, on datasets from physics and chemistry. Slisemap combines manifold visualisation with explainable artificial intelligence. Explainable artificial intelligence is used to investigate the decision processes of black box machine learning models and complex simulators. With Slisemap we find an embedding such that data items with similar local explanations are grouped together. Hence, Slisemap gives us an overview of the different behaviours of a black box model. This makes Slisemap into a supervised manifold visualisation method, where the patterns in the embedding reflect a target property. In this paper we show how Slisemap can be used and evaluated on physical data and that Slisemap is helpful in finding meaningful information on classification and regression models trained on these datasets.
description: 17 pages, 5 + 1 figures, 1 table. The datasets and source code used in the paper are available at https://www.edahelsinki.fi/papers/slisemap_phys
Preparation and coherent manipulation of pure quantum states of a single molecular ion
Creators: name: Chou, Chin-wen
name: Kurz, Christoph
name: Hume, David B.
name: Plessow, Philipp N.
name: Leibrandt, David R.
name: Leibfried, Dietrich
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Laser cooling and trapping of atoms and atomic ions has led to numerous advances including the observation of exotic phases of matter, development of exquisite sensors and state-of-the-art atomic clocks. The same level of control in molecules could also lead to profound developments such as controlled chemical reactions and sensitive probes of fundamental theories, but the vibrational and rotational degrees of freedom in molecules pose a formidable challenge for controlling their quantum mechanical states. Here, we use quantum-logic spectroscopy (QLS) for preparation and nondestructive detection of quantum mechanical states in molecular ions. We develop a general technique to enable optical pumping and preparation of the molecule into a pure initial state. This allows for the observation of high-resolution spectra in a single ion (here CaH+) and coherent phenomena such as Rabi flopping and Ramsey fringes. The protocol requires a single, far-off resonant laser, which is not specific to the molecule, so that many other molecular ions, including polyatomic species, could be treated with the same methods in the same apparatus by changing the molecular source. Combined with long interrogation times afforded by ion traps, a broad range of molecular ions could be studied with unprecedented control and precision, representing a critical step towards proposed applications, such as precision molecular spectroscopy, stringent tests of fundamental physics, quantum computing, and precision control of molecular dynamics.
description: 38 pages in preprint format, 9 figures, 3 tables; added references
DepQBF 6.0: A Search-Based QBF Solver Beyond Traditional QCDCL
Creators: name: Lonsing, Florian
name: Egly, Uwe
Publisher: name: arXiv
Year: 2017
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We present the latest major release version 6.0 of the quantified Boolean formula (QBF) solver DepQBF, which is based on QCDCL. QCDCL is an extension of the conflict-driven clause learning (CDCL) paradigm implemented in state of the art propositional satisfiability (SAT) solvers. The Q-resolution calculus (QRES) is a QBF proof system which underlies QCDCL. QCDCL solvers can produce QRES proofs of QBFs in prenex conjunctive normal form (PCNF) as a byproduct of the solving process. In contrast to traditional QCDCL based on QRES, DepQBF 6.0 implements a variant of QCDCL which is based on a generalization of QRES. This generalization is due to a set of additional axioms and leaves the original Q-resolution rules unchanged. The generalization of QRES enables QCDCL to potentially produce exponentially shorter proofs than the traditional variant. We present an overview of the features implemented in DepQBF and report on experimental results which demonstrate the effectiveness of generalized QRES in QCDCL.
description: 12 pages + appendix; to appear in the proceedings of CADE-26, LNCS, Springer, 2017
Mrk 71/NGC 2366: The nearest Green Pea analog
Creators: name: Micheva, Genoveva
name: Oey, M. S.
name: Jaskot, Anne E.
name: James, Bethan L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the remarkable discovery that the dwarf irregular galaxy NGC 2366 is an excellent analog of the Green Pea (GP) galaxies, which are characterized by extremely high ionization parameters. The similarities are driven predominantly by the giant H II region Markarian 71 (Mrk 71). We compare the system with GPs in terms of morphology, excitation properties, specific star-formation rate, kinematics, absorption of low-ionization species, reddening, and chemical abundance, and find consistencies throughout. Since extreme GPs are associated with both candidate and confirmed Lyman continuum (LyC) emitters, Mrk 71/NGC 2366 is thus also a good candidate for LyC escape. The spatially resolved data for this object show a superbubble blowout generated by mechanical feedback from one of its two super star clusters (SSCs), Knot B, while the extreme ionization properties are driven by the <1 Myr-old, enshrouded SSC Knot A, which has ~ 10 times higher ionizing luminosity. Very massive stars (> 100 Msun) may be present in this remarkable object. Ionization-parameter mapping indicates the blowout region is optically thin in the LyC, and the general properties also suggest LyC escape in the line of sight. Mrk 71/NGC 2366 does differ from GPs in that it is 1 - 2 orders of magnitude less luminous. The presence of this faint GP analog and candidate LyC emitter (LCE) so close to us suggests that LCEs may be numerous and commonplace, and therefore could significantly contribute to the cosmic ionizing budget. Mrk 71/NGC 2366 offers an unprecedentedly detailed look at the viscera of a candidate LCE, and could clarify the mechanisms of LyC escape.
description: 15 pages, 5 figures, 1 table. Accepted in ApJ 24 July 2017
Semiclassical gravity beyond coherent states
Creators: name: Ahmed, Shahnewaz
name: Lima, Caroline
name: Martín-Martínez, Eduardo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that it is possible to still use semiclassical gravity together with quantum field theory beyond the regimes where the field state is coherent. In particular, we identify families of cat states (superposition of almost-distinguishable coherent states that have very non-classical features) for which the gravitational backreaction can be modeled by semiclassical gravity.
description: 9 pages, 1 Appendix. RevTeX 4.2
Singularity at the demise of a black hole
Creators: name: Feng, Justin C.
name: Mukohyama, Shinji
name: Carloni, Sante
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: 83C75, 83C57, 83D99, 83C45

description: We consider a class of quasiregular singularities characterized by points possessing two future-directed light cones and two past-directed light cones. Such singularities appear in the $1+1$ trousers spacetime and the Deutsch-Politzer spacetime. We argue that these singularities are relevant for describing the end point of an evaporating black hole, and show that a class of emergent Lorentz signature theories can provide a microscopic description for these singularities.
description: 12 pages, 7 figures. Added and corrected a reference, minor formatting changes. Matches published version
Adela Kovács, Alexandru Nechifor, Constantin Aparaschivei, Frumusețea transpusă în lut. Catalogul statuetelor antropomorfe cucuteniene din Muzeul Județean Botoșani
Creators: name: Diaconu, Vasile
Publisher: name: Zenodo
Year: 2022
Subjects: Prezentare carte

description: Manifestările artei preistorice s-au îmbinat adeseori cu ideile religioase ale vechilor comunități umane, iar una dintre cele mai frecvente forme de concretizare a acestui dualism a constituit-o reprezentarea antropomorfă.
 Modelările figurative au fost un subiect de cercetare adesea abordat, fapt ce a generat o literatură destul de vastă, care continuă să se îmbogățească mereu.
title: Геолог Н. А. Гедройц и его оценки перспектив нефтеносности Севера Западной Сибири
title: Geologist Nikolai Gedroits and His Assessment of Oil Potential of the North of West Siberia
Creators: name: Евдошенко, Юрий Викторович
Publisher: name: Издательский центр СурГУ
Year: 2022

description: В статье впервые освещаются основные этапы жизни и деятельности одного
из ведущих специалистов середины ХХ в. по проблемам нефтеносности Арктики и Сибири, геолога
Н. А. Гедройца, его вклад в организацию поисковых работ на нефть на Севере Западной Сибири
в 1930-е – 1950-е годы, и оценки перспектив нефтеносности этого региона. Будучи носителем «геолкомовских» традиций, Н. А. Гедройц не только стал открывателем Усть-Енисейского газоносного
района, но и первым предложил организовать нефтепоисковые исследования на Севере ЗападноСибирской низменности, в Тазовском районе. Попутно освещаются малоизвестные страницы организации поисков в Сибири в 1930-е – 1940-е годы.
description: It is the first time that the main stages of life and activity of one of the leading experts
of the middle of the 20th century on issues of oil potential of the Arctic and Siberia, geologist Nikolai
Gedroits, have been highlighted in the article. Information on his contribution to organization of oil reconnaissance in the North of West Siberia in the 1930s–1950s and assessment of oil potential of this region
is given. Being a bearer of the Geological Committee traditions, Nikolai Gedroits did not only become
the discoverer of the Ust-Yenissey gas-bearing region, but was also the first to suggest oil exploration
in the north of the West Siberian Lowland in the Tazovsky Region. Also, little-known facts of organization
of oil exploration in Siberia in the 1930s–1940s are highlighted.
Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction
Creators: name: Winkler, Georg W.
name: Ganahl, Martin
name: Schuricht, Dirk
name: Evertz, Hans Gerd
name: Andergassen, Sabine
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the effect of strong interactions on the spectral properties of quantum wires with strong Rashba spin-orbit interaction in a magnetic field, using a combination of Matrix Product State and bosonization techniques. Quantum wires with strong Rashba spin-orbit interaction and magnetic field exhibit a partial gap in one-half of the conducting modes. Such systems have attracted wide-spread experimental and theoretical attention due to their unusual physical properties, among which are spin-dependent transport, or a topological superconducting phase when under the proximity effect of an s-wave superconductor. As a microscopic model for the quantum wire we study an extended Hubbard model with spin-orbit interaction and Zeeman field. We obtain spin resolved spectral densities from the real-time evolution of excitations, and calculate the phase diagram. We find that interactions increase the pseudo gap at $k = 0$ and thus also enhance the Majorana-supporting phase and stabilize the helical spin order. Furthermore, we calculate the optical conductivity and compare it with the low energy spiral Luttinger Liquid result, obtained from field theoretical calculations. With interactions, the optical conductivity is dominated by an excotic excitation of a bound soliton-antisoliton pair known as a breather state. We visualize the oscillating motion of the breather state, which could provide the route to their experimental detection in e.g. cold atom experiments.
Observing Gravitational Waves with a Single Detector
Creators: name: Callister, T. A.
name: Kanner, J. B.
name: Massinger, T. J.
name: Dhurandhar, S.
name: Weinstein, A. J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A major challenge of any search for gravitational waves is to distinguish true astrophysical signals from those of terrestrial origin. Gravitational-wave experiments therefore make use of multiple detectors, considering only those signals which appear in coincidence in two or more instruments. It is unclear, however, how to interpret loud gravitational-wave candidates observed when only one detector is operational. In this paper, we demonstrate that the observed rate of binary black hole mergers can be leveraged in order to make confident detections of gravitational-wave signals with one detector alone. We quantify detection confidences in terms of the probability $P(S)$ that a signal candidate is of astrophysical origin. We find that, at current levels of instrumental sensitivity, loud signal candidates observed with a single Advanced LIGO detector can be assigned $P(S)\gtrsim0.4$. In the future, Advanced LIGO may be able to observe single-detector events with confidences exceeding $P(S)\sim90\%$.
description: 8 pages, 4 figures; published in CQG; minor updates to match published version
Omagiu Colegului și Prietenului Ion Tentiuc la 65 de ani
Creators: name: Musteață, Sergiu
Publisher: name: Zenodo
Year: 2022
Subjects: In Honorem

description: La începutul anului 2022 prietenul Ion Tentiuc a împlinit frumoasa vârstă de 65 de ani, care este un moment de evaluare a carierei profesionale și un prilej de omagiat din partea colegilor de breaslă. Recunosc, că am auzit de numele Ion Tentiuc încă din anii de studenție (1989-1994), dar l-am cunoscut personal abia în toamna anului 1994, apoi ne-am intersectat cu diverse ocazii profesionale la conferințe, simpozioane, șantierul arheologic de la Orheiul Vechi (1995-2012), însă o colaborare adevărată a început în anul 2012 de când am devenit parte a echipei de cercetare a castelului Soroca, care s-a fortificat odată cu lansarea în anul 2018 a proiectului arheologia urbane a Chișinăului.
Nanouska Myrberg Burström, Gitte Tarnow Ingvardson, eds., Divina Moneta: Coins in Religion and Ritual, London-New York, Routledge, 2018
Creators: name: Baltag Andrei
Publisher: name: Zenodo
Year: 2022
Subjects: Prezentare carte

description: Interesul pentru descoperirile monetare din contexte religioase a capătat un avânt tot mai pronunțat în literatura de specialitate. Din această cauză, direcția celor mai multe investigații numismatice recente conferă monedei rolul de agent determinant în joncțiunea dintre sacru și profan. Apariția volumului de față marchează eforturile conjugate ale unui spectru foarte larg de cercetători, cu preocupări multiple de istorie, numismatică, arheologie, istoria artei sau etnologie.
IN HONOREM Profesorului nostru, domnul Prof. Dr. Dr. hc Svend HANSEN la ceas aniversar
Creators: name: Uhl, Regina A.
Publisher: name: Zenodo
Year: 2022
Subjects: In Honorem

description: Vor Kurzem feierte Svend Hansen, Erster Direktor der Eurasien-Abteilung, Deutsches Archäologisches Institut, seinen 60. Geburtstag.
Propagating edge states in strained honeycomb lattices
Creators: name: Salerno, Grazia
name: Ozawa, Tomoki
name: Price, Hannah M.
name: Carusotto, Iacopo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the helically-propagating edge states associated with pseudo-Landau levels in strained honeycomb lattices. We exploit chiral symmetry to derive a general criterion for the existence of these propagating edge states in the presence of only nearest-neighbour hoppings and we verify our criterion using numerical simulations of both uni-axially and trigonally strained honeycomb lattices. We show that the propagation of the helical edge state can be controlled by engineering the shape of the edges. Sensitivity to chiral-symmetry-breaking next-nearest-neighbour hoppings is assessed. Our result opens up an avenue toward the precise control of edge modes through manipulation of the edge shape.
Purcell enhancement of silicon W centers in circular Bragg grating cavities
Creators: name: Lefaucher, Baptiste
name: Jager, Jean-Baptiste
name: Calvo, Vincent
name: Cache, Félix
name: Durand, Alrik
name: Jacques, Vincent
name: Robert-Philip, Isabelle
name: Cassabois, Guillaume
name: Baron, Yoann
name: Mazen, Frédéric
name: Kerdilès, Sébastien
name: Reboh, Shay
name: Dréau, Anaïs
name: Gérard, Jean-Michel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Generating single photons on demand in silicon is a challenge to the scalability of silicon-on-insulator integrated quantum photonic chips. While several defects acting as artificial atoms have recently demonstrated an ability to generate antibunched single photons, practical applications require tailoring of their emission through quantum cavity effects. In this work, we perform cavity quantum electrodynamics experiments with ensembles of artificial atoms embedded in silicon-on-insulator microresonators. The emitters under study, known as W color centers, are silicon tri-interstitial defects created upon self-ion implantation and thermal annealing. The resonators consist of circular Bragg grating cavities, designed for moderate Purcell enhancement ($F_p=12.5$) and efficient luminescence extraction ($η_{coll}=40\%$ for a numerical aperture of 0.26) for W centers located at the mode antinode. When the resonant frequency mode of the cavity is tuned with the zero-phonon transition of the emitters at 1218 nm, we observe a 20-fold enhancement of the zero-phonon line intensity, together with a two-fold decrease of the total relaxation time in time-resolved photoluminescence experiments. Based on finite-difference time-domain simulations, we propose a detailed theoretical analysis of Purcell enhancement for an ensemble of W centers, considering the overlap between the emitters and the resonant cavity mode. We obtain a good agreement with our experimental results assuming a quantum efficiency of $65 \pm 10 \%$ for the emitters in bulk silicon. Therefore, W centers open promising perspectives for the development of on-demand sources of single photons, harnessing cavity quantum electrodynamics in silicon photonic chips.
Theory and optical design of x-ray echo spectrometers
Creators: name: Shvyd'ko, Yuri
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: X-ray echo spectroscopy, a space-domain counterpart of neutron spin echo, is a recently proposed inelastic x-ray scattering (IXS) technique. X-ray echo spectroscopy relies on imaging IXS spectra, and does not require x-ray monochromatization. Due to this, the echo-type IXS spectrometers are broadband, and thus have a potential to simultaneously provide dramatically increased signal strength, reduced measurement times, and higher resolution compared to the traditional narrow-band scanning-type IXS spectrometers. The theory of x-ray echo spectrometers presented in [1] is developed here further with a focus on questions of practical importance, which could facilitate optical design and assessment of the feasibility and performance of the echo spectrometers. Among others, the following questions are addressed: spectral resolution, refocusing condition, echo spectrometer tolerances, refocusing condition adjustment, effective beam size on the sample, spectral window of imaging and scanning range, impact of the secondary source size on the spectral resolution, angular dispersive optics, focusing and collimating optics, and detector's spatial resolution. Examples of optical designs and characteristics of echo spectrometers with 1-meV and 0.1-meV resolutions are presented.
description: 22 pages, 13 Figures, 5 tables. arXiv admin note: text overlap with arXiv:1511.01526
Numerical calculations on the relative entanglement entropy in critical spin chains
Creators: name: Nakagawa, Yuya O.
name: Ugajin, Tomonori
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the relative entanglement entropy (EE) among various primary excited states in two critical spin chains: the S=1/2 XXZ chain and the transverse field Ising chain at criticality. For the S=1/2 XXZ chain, which corresponds to c=1 free boson conformal field theory (CFT), we numerically calculate the relative EE by exact diagonalization and find a perfect agreement with the predictions by the CFT. For the transverse field Ising chain at criticality, which corresponds to the c=1/2 Ising CFT, we analytically relate its relative EE to that of the S=1/2 XXZ chain and confirm the relation numerically. We also calculate the "sandwiched" Rényi relative EE and again the numerical results agree well with the analytical predictions. Our results are the first direct confirmation of the CFT predictions on the relative EE of the primary excited states in critical spin chains.
description: 16 pages, 5 figures
A General Framework for Robust G-Invariance in G-Equivariant Networks
Creators: name: Sanborn, Sophia
name: Miolane, Nina
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We introduce a general method for achieving robust group-invariance in group-equivariant convolutional neural networks ($G$-CNNs), which we call the $G$-triple-correlation ($G$-TC) layer. The approach leverages the theory of the triple-correlation on groups, which is the unique, lowest-degree polynomial invariant map that is also complete. Many commonly used invariant maps--such as the max--are incomplete: they remove both group and signal structure. A complete invariant, by contrast, removes only the variation due to the actions of the group, while preserving all information about the structure of the signal. The completeness of the triple correlation endows the $G$-TC layer with strong robustness, which can be observed in its resistance to invariance-based adversarial attacks. In addition, we observe that it yields measurable improvements in classification accuracy over standard Max $G$-Pooling in $G$-CNN architectures. We provide a general and efficient implementation of the method for any discretized group, which requires only a table defining the group's product structure. We demonstrate the benefits of this method for $G$-CNNs defined on both commutative and non-commutative groups--$SO(2)$, $O(2)$, $SO(3)$, and $O(3)$ (discretized as the cyclic $C8$, dihedral $D16$, chiral octahedral $O$ and full octahedral $O_h$ groups)--acting on $\mathbb{R}^2$ and $\mathbb{R}^3$ on both $G$-MNIST and $G$-ModelNet10 datasets.
The impact of flight trajectories in aviation emissions: the GreAT project
Creators: name: Alonso, Gustavo
name: Benito, Arturo
Publisher: name: Zenodo
Year: 2022
Subjects: GreAT
H2020
H2020 Transport
climate change
green aviation
air traffic operations
CINEA

description: Presenattion at RIDITA 2022: VIII CONGRESO INTERNACIONAL DE LA RED IBEROAMERICA DE INVESTIGACIÓN EN TRANSPORTE AÉREO, Medellin (Colombia), 5-7 October 2022
Non-Hermitian extended midgap states and bound states in the continuum
Creators: name: Zelenayova, Maria
name: Bergholtz, Emil J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate anomalous localization phenomena in non-Hermitian systems by solving a class of generalized Su-Schrieffer-Heeger/Rice-Mele models and by relating their provenance to fundamental notions of topology, symmetry-breaking and biorthogonality. We find two flavours of bound states in the continuum, both stable even in the absence of chiral symmetry. The first being skin bulk states which are protected by the spectral winding number. The second flavour is constituted by boundary modes associated with a quantized biorthogonal polarization. Furthermore, we find the extended state stemming from the boundary state that delocalizes while remaining in the gap at bulk critical points. This state may also delocalize within a continuum of localized (skin) states. These results clarify fundamental aspects of topology, and symmetry in the light of different approaches to the anomalous non-Hermitan bulk-boundary correspondence -- and are of direct experimental relevance for mechanical, electrical and photonic systems.
Scalable Quantum Photonics with Single Color Centers in Silicon Carbide
Creators: name: Radulaski, Marina
name: Widmann, Matthias
name: Niethammer, Matthias
name: Zhang, Jingyuan Linda
name: Lee, Sang-Yun
name: Rendler, Torsten
name: Lagoudakis, Konstantinos G.
name: Son, Nguyen Tien
name: Janzén, Erik
name: Ohshima, Takeshi
name: Wrachtrup, Jörg
name: Vučković, Jelena
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Silicon carbide is a promising platform for single photon sources, quantum bits (qubits) and nanoscale sensors based on individual color centers. Towards this goal, we develop a scalable array of nanopillars incorporating single silicon vacancy centers in 4H-SiC, readily available for efficient interfacing with free-space objective and lensed-fibers. A commercially obtained substrate is irradiated with 2 MeV electron beams to create vacancies. Subsequent lithographic process forms 800 nm tall nanopillars with 400-1,400 nm diameters. We obtain high collection efficiency, up to 22 kcounts/s optical saturation rates from a single silicon vacancy center, while preserving the single photon emission and the optically induced electron-spin polarization properties. Our study demonstrates silicon carbide as a readily available platform for scalable quantum photonics architecture relying on single photon sources and qubits.
description: 18 pages, 8 figures
ЛАБОРАТОРНОЕ ИССЛЕДОВАНИЕ ФЕКАЛИЙ ПРИ ПАРАЗИТАРНЫХ ЗАБОЛЕВАНИЯХ ЖИВОТНЫХ
Creators: name: Кучкорова, Санобар
name: Урунова, Гулрух
Publisher: name: Zenodo
Year: 2025

description: В статье рассматриваются методы отбора, транспортировки и лабораторного исследования фекальных образцов животных при подозрении на паразитарные заболевания. Описаны современные диагностические подходы, включая гельминтоовоскопию, гельминтоларвоскопию, флотационные методы, микроскопию и серологические исследования, такие как ИФА.
The environmental impact assessment of greener trajectories
Creators: name: Alonso, Gustavo
name: Benito, Arturo
Publisher: name: Zenodo
Year: 2022
Subjects: GreAT
green aviation
H2020 Transport
climate change
CINEA
air traffic operations

description: Presentation at 12th EASN International Conference on "Innovation in Aviation & Space for opening New Horizons", Barcelona, Spain, 18-21/10/22, http://easnconference.eu/