cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stability of $d$-dimensional Gravastars with Variable Equation of State
Creators: name: Sharif, M.
name: Javed, Faisal
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we are interested to explore stable configurations of $d$-dimensional gravastars constructed from the interior $d$-dimensional de Sitter and exterior $d$-dimensional Schwarzschild/Reissner-Nordström (de Sitter) black holes through cut and paste approach. We consider the linearized radial perturbation preserving the original symmetries to explore their stability by using three different types of matter distributions. The resulting frameworks represent unstable structures for barotropic, Chaplygin, and phantomlike models for every considered choice of exterior geometries. However, matter contents with variable equations of state have a remarkable role to maintain the stability of gravastars. We conclude that stable structures of gravastars are obtained only for generalized variable models with exterior $d$-dimensional Schwarzschild/Reissner-Nordström-de Sitter black holes.
description: 21 pages, 12 figures, to appear in Chinese J. Physics
Bounds for zeros of a polynomial using numerical radius of Hilbertian space operators
Creators: name: Bhunia, Pintu
name: Bag, Santanu
name: Paul, Kallol
Publisher: name: arXiv
Year: 2019
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A12, 15A60, 26C10

description: We obtain bounds for the numerical radius of $2 \times 2$ operator matrices which improve on the existing bounds. We also show that the inequalities obtained here generalize the existing ones. As an application of the results obtained here we estimate the bounds for the zeros of a monic polynomial and illustrate with numerical examples that the bounds are better than the existing ones.
An epidemic model in inhomogeneous environment
Creators: name: Bertacchi, Daniela
name: Kampf, Jürgen
name: Sava-Huss, Ecaterina
name: Zucca, Fabio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J10, 60J80, 60F17

description: The current work deals with an epidemic model on the complete graph K_n on n vertices in a non-homogeneous setting, where the vertices may have distinct types. Different types differ in the probability of getting infected, and/or in the capacity of infecting other vertices. This generalizes previous models where vertices are all of the same type and have equal probabilities of being infected. We prove laws of large numbers and central limit theorems for the the total duration of the process and for the number of infected vertices, respectively, when n goes to infinity. By coupling the epidemic model with a Poisson process, we also obtain continuous-time counterparts of the above-mentioned limit results. Moreover, we also prove that when all individuals have the same spread capacity, then a population with inhomogeneous susceptibility is less affected by the epidemics than a homogeneous population.
description: final version incorporating referee's suggestions
Marsipococcus Cockerell & Bueker 1930
Creators: name: Deng, Min
name: Watson, Gillian W.
name: Xing, Jichun
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Coccidae
Marsipococcus

description: A world checklist of species of Marsipococcus
M. brideliae Deng & Xing, 2024: distribution: China; host: Bridelia retusa (Phyllanthaceae).
M. christopheri Joshi, 2020: distribution: India; host: Piper nigrum (Piperaceae).
M. maolanensis Deng, Watson & Xing, sp. n.: distribution: China; host: Bridelia retusa (Phyllanthaceae).
M. marsupialis (Green, 1904): distribution: Ethiopia, India, Malaya, Sri Lanka, Tanzania and Thailand; hosts: species of Annonaceae, Araceae, Arecaceae, Euphorbiaceae, Moraceae, Piperaceae and Solanaceae.
M. ulubendulensis Łagowska & Martin, 2017: distribution: Malaysia; host: Annonaceae.
Key to Marsipococcus species, based on adult female morphology
1(0) Ventral tubular ducts absent............................................................. M. christopheri Joshi
- Ventral tubular ducts present............................................................................ 2
2(1) Ventral multilocular disc-pores present.................................................. M. marsupialis (Green)
- Ventral multilocular disc-pores absent.................................................................... 3
3(2) Antennae each 6 segmented. Marginal setae lanceolate......................................... M. ulubendulensis
- Antennae each 7 or 8 segmented. Marginal setae narrowly conical.............................................. 4
4(3) Antenna with 8 segments............................................ M. maolanensis Deng, Watson & Xing sp. n.
- Antenna with 7 segments.......................................................... M. brideliae Deng & Xing
description: Published as part of Deng, Min, Watson, Gillian W. & Xing, Jichun, 2025, Description of a new species of Marsipococcus Cockerell & Bueker (Hemiptera: Coccomorpha: Coccidae) from China, with a key to all the species, pp. 351-362 in Zootaxa 5588 (2) on page 361, DOI: 10.11646/zootaxa.5588.2.9, http://zenodo.org/record/14896550
Axially-deformed solution of the Skyrme-Hartree-Fock-Bogoliubov equations using the transformed harmonic oscillator basis (IV) hfbtho (v4.0): A new version of the program
Creators: name: Marevic, P.
name: Schunck, N.
name: Ney, E. M.
name: Pérez, R. Navarro
name: Verriere, M.
name: O'Neal, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We describe the new version 4.0 of the code hfbtho that solves the nuclear Hartree-Fock-Bogoliubov problem by using the deformed harmonic oscillator basis in cylindrical coordinates. In the new version, we have implemented the restoration of rotational, particle number, and reflection symmetry. The restoration of rotational symmetry does not require using bases closed under rotation. Furthermore, the SeaLL1 functional was added and the calculation of the Coulomb potential was improved. Finally, the code has been refactored to facilitate maintenance and future developments.
description: 21 pages, 7 figures, 2 tables
Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3
Creators: name: Zhang, Haochen
name: Kim, Subin
name: Kim, Young-June
name: Kee, Hae-Young
name: Yang, Luyi
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: α-RuCl3 is a Kitaev material suggested to be a proximate quantum spin liquid in a certain temperature and magnetic field range. Nonequilibrium measurements of transient dynamics have been proposed to detect fractionalized particles that emerge in the spin liquid and to possibly drive the system into novel photoinduced magnetic states that cannot be accessed by conventional equilibrium probes. Here we study ultrafast spin dynamics of photoinduced excitations in α-RuCl3 using pump-probe transient grating spectroscopy. In the real part of the complex transient reflectance change ΔR/R, we observe the long-range antiferromagnetic correlation near the Néel temperature. Most intriguingly, above the Néel temperature in the Kitaev paramagnetic phase, we reveal a photoexcitation component sensitive to the in-plane magnetic field in the imaginary part of ΔR/R. This component exhibits two distinct lifetimes of about tens of picoseconds. This photoexcitation component may be connected to novel photoexcited states in the Kitaev quantum spin liquid, and its lifetimes likely reflect the dynamics of unconventional spin excitations in the Kitaev model.
Embedding of rank two supercharges in the superconformal algebra
Creators: name: Alvarez, Pedro D.
name: Chavez, Rafael A.
name: Zanelli, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss an embedding of $su(n)$ rank-two antisymmetric supercharges in the $su(2,2|d_n)$ superalgebra, where $d_n=n(n-1)/2$. We describe an algorithm to construct the explicit form of the generators of the superalgebra.
Conductor-discriminant inequality for hyperelliptic curves in odd residue characteristic
Creators: name: Obus, Andrew
name: Srinivasan, Padmavathi
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G20, 14H25, 14J17 (Primary), 14B05 (Secondary)

description: We prove an inequality between the conductor and the discriminant for all hyperelliptic curves defined over discretely valued fields $K$ with perfect residue field of characteristic not 2. Specifically, if such a curve is given by $y^2 = f(x)$ with $f(x) \in \mathcal{O}_K[x]$, and if $X$ is its minimal regular model over $\mathcal{O}_K$, then the negative of the Artin conductor of $X$ (and thus also the number of irreducible components of the special fiber of $X$) is bounded above by the valuation of disc$(f)$. There are no restrictions on genus of the curve or on the ramification of the splitting field of $f$. This generalizes earlier work of Ogg, Saito, Liu, and the second author.
description: Final version, to appear in IMRN. Main argument drastically shortened per referee's suggestions. Now 13 pp
Terahertz Kerr effect in a methylammonium lead bromide perovskite crystal
Creators: name: Melnikov, A. A.
name: Anikeeva, V. E.
name: Semenova, O. I.
name: Chekalin, S. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We have observed short-lived optical birefringence in a CH$_3$NH$_3$PbBr$_3$ single crystal induced by a powerful nearly single-cycle terahertz pulse. Apart from the instantaneous contribution that follows the profile of the squared pump electric field, the recorded anisotropy signal contains an exponential component decaying in $\sim$ 350 fs, underdamped oscillations at the frequency of $\sim$ 0.16 THz and an intermediate picosecond relaxation process with a Gaussian tail. We associate these three non-trivial features with, respectively, Kerr effect in the inorganic lattice, terahertz-induced transient alignment of CH$_3$NH$_3^+$ cations, and their coherent rotation excited by the terahertz pulse in a Raman process.
description: 8 pages, 4 figures
Dental calculus in the industrial age : Human dental calculus in the Post-Medieval period, a case study from industrial Manchester
Creators: name: MacKenzie, Lisa
name: Speller, Camilla F.
name: Holst, Malin
name: Keefe, Katie
name: Radini, Anita
Publisher: name: The University of British Columbia
Year: 2023

description: The analysis of dental calculus (mineralised dental plaque) has become an increasingly important facet of bioarchaeological research. Although microscopic analysis of microdebris entrapped within dental calculus has revealed important insights into the diet, health, and environment of multiple prehistoric populations, relatively few studies have examined the contributions of this approach to more recent historical periods. In this study, we analyze dental calculus from an English Post-Medieval, middle-class urban skeletal assemblage from Manchester, England using light microscopy. We characterize all types of microremains, observing heavily damaged starch and plant material, high quantities of fungal and yeast spores, the presence of wood particles, plant (cotton) and animal (wool) fibres, as well as limited quantities of microcharcoal and burnt debris. We observe the presence of non-native, imported plant products, including New World maize and potentially tapioca starch. We compare our results to similar studies from earlier time periods to reveal the impacts of the significant economic, social and environmental changes occurring during the Industrial period in England, including changes in food processing, food access, food storage, and air quality. We conclude by outlining important methodological considerations for the future study of Post-Medieval dental calculus and propose potential areas of future research.
EuroCropsML: A Time Series Benchmark Dataset For Few-Shot Crop Type Classification
Creators: name: Reuss, Joana
name: Macdonald, Jan
name: Becker, Simon
name: Richter, Lorenz
name: Körner, Marco
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We introduce EuroCropsML, an analysis-ready remote sensing machine learning dataset for time series crop type classification of agricultural parcels in Europe. It is the first dataset designed to benchmark transnational few-shot crop type classification algorithms that supports advancements in algorithmic development and research comparability. It comprises 706 683 multi-class labeled data points across 176 classes, featuring annual time series of per-parcel median pixel values from Sentinel-2 L1C data for 2021, along with crop type labels and spatial coordinates. Based on the open-source EuroCrops collection, EuroCropsML is publicly available on Zenodo.
description: 12 pages, 8 figures
An exploration of the institutions, characteristics and drivers of elite philanthropy in India
Creators: name: Godfrey, John
Publisher: name: Swinburne
Year: 2024

description: The motivations for elite philanthropy are frequently questioned and often considered to be self-serving. Most of the evidence advanced to support this, however, is drawn from studies of Western philanthropists. This thesis examines elite philanthropy in India. The research applies a methodology and theoretical framework that has been used for similar research in the West. It discovers that, although the motivating factors which influence Indian philanthropists are similar to those for the West, their outcome is significantly different. This research shows elite Indian philanthropists could be understood as more altruistic and less self-serving than those identified in the West.
Fixed points of Koch's maps
Creators: name: Le, Van Tu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32H50, 37F99

description: We study endomorphisms constructed by Sarah Koch in her thesis and we focus on the eigenvalues of the differential of such maps at its fixed points. In Koch's thesis, to each post-critically finite unicritical polynomial, Koch associated a post-critically algebraic endomorphism of $\mathbb{CP}^k$. Koch showed that the eigenvalues of the differentials of such maps along periodic cycles outside the post-critical sets have modulus strictly greater than $1$. In this article, we show that the eigenvalues of the differentials at fixed points are either $0$ or have modulus strictly greater than $1$. This confirms a conjecture proposed by the author in his thesis. We also provide a concrete description of such values in terms of the multiplier of a unicritical polynomial.
Adatok a Bikácsi Ökör-hegy, a kistápi láprétek és erdők, valamint a Nagydorogi Szenes-legelő Macrolepidoptera faunájához Contribution to the Macrolepidoptera Fauna (Lepidoptera) of Bikácsi Ökör Ökör-hegy, meadows and woods of Kistápé and Nagydorogi Szenes Szenes-legelő (South Hungary, Tolna County)
Creators: name: Kalotás, Zsolt
Publisher: name: Zenodo
Year: 2024

description: The researcher commenced work in 1980 in the Dél Dél-Mezőföld Landscape Protection District, amosaic of diverse natural habitats comprising the Bikács Ökör Ökör-hegy, the meadows and forests of Kistápé,and the Nagydorog Szenes Szenes-legelő. Until 2017, the research focused solely on diurnal faunistic surveys,with nocturnal moth surveys conducted between 2017 2017-2024. For diurnal butterflies, visual observationand photography were employed, while nocturnal butterfly surveys utilised lamp surveys, red wine traps,and sex pheromones. The investigations resulted in the documentation of 637 species of large moths with-in the study area, of which 52 are protected in Hungary.
Efficient and Convergent Sequential Pseudo-Likelihood Estimation of Dynamic Discrete Games
Creators: name: Dearing, Adam
name: Blevins, Jason R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Econometrics (econ.EM)
subject: FOS: Economics and business

description: We propose a new sequential Efficient Pseudo-Likelihood (k-EPL) estimator for dynamic discrete choice games of incomplete information. k-EPL considers the joint behavior of multiple players simultaneously, as opposed to individual responses to other agents' equilibrium play. This, in addition to reframing the problem from conditional choice probability (CCP) space to value function space, yields a computationally tractable, stable, and efficient estimator. We show that each iteration in the k-EPL sequence is consistent and asymptotically efficient, so the first-order asymptotic properties do not vary across iterations. Furthermore, we show the sequence achieves higher-order equivalence to the finite-sample maximum likelihood estimator with iteration and that the sequence of estimators converges almost surely to the maximum likelihood estimator at a nearly-superlinear rate when the data are generated by any regular Markov perfect equilibrium, including equilibria that lead to inconsistency of other sequential estimators. When utility is linear in parameters, k-EPL iterations are computationally simple, only requiring that the researcher solve linear systems of equations to generate pseudo-regressors which are used in a static logit/probit regression. Monte Carlo simulations demonstrate the theoretical results and show k-EPL's good performance in finite samples in both small- and large-scale games, even when the game admits spurious equilibria in addition to one that generated the data. We apply the estimator to study the role of competition in the U.S. wholesale club industry.
Optical Front/Mid-haul with Open Access-Edge Server Deployment Framework for Sliced O-RAN
Creators: name: Mondal, Sourav
name: Ruffini, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The fifth-generation of mobile radio technologies is expected to be agile, flexible, and scalable while provisioning ultra-reliable and low-latency communication (uRLLC), enhanced mobile broadband (eMBB), and massive machine type communication (mMTC) applications. An efficient way of implementing these is by adopting cloudification, network function virtualization, and network slicing techniques with open-radio access network (O-RAN) architecture where the base-band processing functions are disaggregated into virtualized radio unit (RU), distributed unit (DU), and centralized unit (CU) over front/mid-haul interfaces. However, cost-efficient solutions are required for designing front/mid-haul interfaces and time-wavelength division multiplexed (TWDM) passive optical network (PON) appears as a potential candidate. Therefore, in this paper, we propose a framework for the optimal placement of RUs based on long-term network statistics and connecting them to open access-edge servers for hosting the corresponding DUs and CUs over front/mid-haul interfaces while satisfying the diverse QoS requirements of uRLLC, eMBB, and mMTC slices. In turn, we formulate a two-stage integer programming problem and time-efficient heuristics for users to RU association and flexible deployment of the corresponding DUs and CUs. We evaluate the O-RAN deployment cost and latency requirements with our TWDM-PON-based framework against urban, rural, and industrial areas and show its efficiency over the optical transport network (OTN)-based framework.
description: This is the final version to be published in IEEE Transactions on Network and Service Management (TNSM). Copyright @ IEEE
Valley transport driven by dynamic lattice distortion
Creators: name: Ominato, Yuya
name: Oue, Daigo
name: Matsuo, Mamoru
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Angular momentum conversion between mechanical rotation and the valley degree of freedom in 2D Dirac materials is investigated theoretically. Coupling between the valley and vorticity of dynamic lattice distortions is derived by applying the k.p method to 2D Dirac materials with an inertial effect. Lattice strain effects are also incorporated. Valley transfer and valley-dependent carrier localization are predicted using the dynamic lattice distortions. The transport properties are found to be controllable, allowing the system to be insulating and to generate pulsed charge current. Our formalism offers a route toward mechanical manipulation of valley dynamics in 2D Dirac materials.
description: 10 pages, 5 figures
Witten-Reshetikhin-Turaev Invariants, Homological Blocks, and Quantum Modular Forms for Unimodular Plumbing H-Graphs
Creators: name: Mori, Akihito
name: Murakami, Yuya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Number Theory (math.NT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 57K31, 57K10, 57K16, 11F27, 11L05, 11T24

description: Gukov-Pei-Putrov-Vafa constructed $q$-series invariants called homological blocks in a physical way in order to categorify Witten-Reshetikhin-Turaev (WRT) invariants and conjectured that radial limits of homological blocks are WRT invariants. In this paper, we prove their conjecture for unimodular H-graphs. As a consequence, it turns out that the WRT invariants of H-graphs yield quantum modular forms of depth two and of weight one with the quantum set $\mathbb{Q}$. In the course of the proof of our main theorem, we first write the invariants as finite sums of rational functions. We second carry out a systematic study of weighted Gauss sums in order to give new vanishing results for them. Combining these results, we finally prove that the above conjecture holds for H-graphs.
Transport of structure in higher homological algebra
Creators: name: Bennett-Tennenhaus, Raphael
name: Shah, Amit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 18E05, 18E10, 18G80

description: We fill a gap in the literature regarding `transport of structure' for (n+2)-angulated, n-exact, n-abelian and n-exangulated categories appearing in (classical and higher) homological algebra. As an application of our main results, we show that a skeleton of one of these kinds of categories inherits the same structure in a canonical way, up to equivalence. In particular, it follows that a skeleton of a weak (n+2)-angulated category is in fact what we call a strong (n+2)-angulated category. When n=1 this clarifies a technical concern with the definition of a cluster category. We also introduce the notion of an n-exangulated functor between n-exangulated categories. This recovers the definition of an (n+2)-angulated functor when the categories concerned are (n+2)-angulated, and the higher analogue of an exact functor when the categories concerned are n-exact.
description: v3: 24 pages; minor typographical changes; accepted in Journal of Algebra
Nonreciprocal phonon blockade
Creators: name: Yao, Xiao-Yu
name: Ali, Hamad
name: Li, Peng-Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum nonreciprocal devices have received extensive attention in recent years because they can be used to realize unidirectional quantum routing and noise isolation. In this work, we show that the shift of resonance frequencies of propagating phonons induced by spin-orbit interactions (SOI) of phonons in a rotating acoustic ring cavity can be used to realize nonreciprocal phonon blockade. When driving the cavity from different directions, nonreciprocal single-, two-phonon blockade and phonon-induced tunneling can take place by varying the parameters of the system to an appropriate value. To realize phonon blockade, the sublevels of the lower orbit branch of the ground state of silicon-vacancy (SiV) color centers in the diamond membrane are employed to induce self-interactions of phonons in the cavity. This work provides a way to achieve acoustic nonreciprocal devices, such as directional acoustic switches and quantum noise isolation, which may help acoustic information network processing.
description: 10 pages, 9 figures
Characterization of Adaptive-like γδ T Cells in Ugandan Infants during Primary Cytomegalovirus Infection
Creators: name: Tuengel, Jessica
name: Ranchal, Sanya
name: Maslova, Alexandra
name: Aulakh, Gurpreet
name: Papadopoulou, Maria
name: Drissler, Sibyl
name: Cai, Bing
name: Mohsenzadeh-Green, Cetare
name: Soudeyns, Hugo
name: Mostafavi, Sara
name: Van Den Elzen, Peter
name: Vermijlen, David
name: Cook, Laura
name: Gantt, Soren
Publisher: name: Multidisciplinary Digital Publishing Institute
Year: 2021

description: Gamma-delta (γδ) T cells are unconventional T cells that help control cytomegalovirus (CMV) infection in adults. γδ T cells develop early in gestation, and a fetal public γδ T cell receptor (TCR) clonotype is detected in congenital CMV infections. However, age-dependent γδ T cell responses to primary CMV infection are not well-understood. Flow cytometry and TCR sequencing was used to comprehensively characterize γδ T cell responses to CMV infection in a cohort of 32 infants followed prospectively from birth. Peripheral blood γδ T cell frequencies increased during infancy, and were higher among CMV-infected infants relative to uninfected. Clustering analyses revealed associations between CMV infection and activation marker expression on adaptive-like Vδ1 and Vδ3, but not innate-like Vγ9Vδ2 γδ T cell subsets. Frequencies of NKG2C⁺CD57⁺ γδ T cells were temporally associated with the quantity of CMV shed in saliva by infants with primary infection. The public γδ TCR clonotype was only detected in CMV-infected infants <120 days old and at lower frequencies than previously described in fetal infections. Our findings support the notion that CMV infection drives age-dependent expansions of specific γδ T cell populations, and provide insight for novel strategies to prevent CMV transmission and disease.
Distributed entanglement generation from asynchronously excited qubits
Creators: name: Huan, Tiantian
name: Zhou, Rigui
name: Ian, Hou
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The generation of GHZ states calls for simultaneous excitation of multiple qubits. The peculiarity of such states is reflected in their nonzero distributed entanglement which is not contained in other entangled states. We study the optimal way to excite three superconducting qubits through a common cavity resonator in a circuit such that the generation of distributed entanglement among them could be obtained at the highest degree in a time-controllable way. A non-negative measure quantifying this entanglement is derived as a time function of the quadripartite system evolution. We find that this measure does not stay static but obtains the same maximum periodically. When the qubit-resonator couplings are allowed to vary, its peak value is enhanced monotonically by increasing the greatest coupling strength to one of the qubits. The period of its peak to peak revival maximizes when the couplings become inhomogeneous, thus qubit excitation becoming asynchronous, at a relative ratio of 0.35. The study demonstrates the role of asynchronous excitations for time-controlling multi-qubit systems, in particular in extending entanglement time.
Reconstruction of Sentinel-2 Time Series Using Robust Gaussian Mixture Models -- Application to the Detection of Anomalous Crop Development in wheat and rapeseed crops
Creators: name: Mouret, Florian
name: Albughdadi, Mohanad
name: Duthoit, Sylvie
name: Kouamé, Denis
name: Rieu, Guillaume
name: Tourneret, Jean-Yves
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Missing data is a recurrent problem in remote sensing, mainly due to cloud coverage for multispectral images and acquisition problems. This can be a critical issue for crop monitoring, especially for applications relying on machine learning techniques, which generally assume that the feature matrix does not have missing values. This paper proposes a Gaussian Mixture Model (GMM) for the reconstruction of parcel-level features extracted from multispectral images. A robust version of the GMM is also investigated, since datasets can be contaminated by inaccurate samples or features (e.g., wrong crop type reported, inaccurate boundaries, undetected clouds, etc). Additional features extracted from Synthetic Aperture Radar (SAR) images using Sentinel-1 data are also used to provide complementary information and improve the imputations. The robust GMM investigated in this work assigns reduced weights to the outliers during the estimation of the GMM parameters, which improves the final reconstruction. These weights are computed at each step of an Expectation-Maximization (EM) algorithm by using outlier scores provided by the isolation forest algorithm. Experimental validation is conducted on rapeseed and wheat parcels located in the Beauce region (France). Overall, we show that the GMM imputation method outperforms other reconstruction strategies. A mean absolute error (MAE) of 0.013 (resp. 0.019) is obtained for the imputation of the median Normalized Difference Index (NDVI) of the rapeseed (resp. wheat) parcels. Other indicators (e.g., Normalized Difference Water Index) and statistics (for instance the interquartile range, which captures heterogeneity among the parcel indicator) are reconstructed at the same time with good accuracy. In a dataset contaminated by irrelevant samples, using the robust GMM is recommended since the standard GMM imputation can lead to inaccurate imputed values.
Refinements of norm and numerical radius inequalities
Creators: name: Bhunia, Pintu
name: Paul, Kallol
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47A12, 47A30

description: Several refinements of norm and numerical radius inequalities of bounded linear operators on a complex Hilbert space are given. In particular, we show that if $A$ is a bounded linear operator on a complex Hilbert space, then $$ \frac{1}{4}\|A^*A+AA^*\| \leq \frac{1}{8}\bigg( \|A+A^*\|^2+\|A-A^*\|^2 +c^2(A+A^*)+c^2(A-A^*)\bigg) \leq w^2(A)$$ and \begin{eqnarray*}
 \frac{1}{2}\|A^*A+AA^*\| - \frac{1}{4}\bigg\|(A+A^*)^2 (A-A^*)^2 \bigg\|^{1/2} \leq w^2(A) \leq \frac{1}{2}\|A^*A+AA^*\|, \end{eqnarray*} %$$ \frac{1}{4}\|A^*A+AA^*\| \leq \frac{1}{2}w^2(A) + \frac{1}{8}\bigg\|(A+A^*)^2 (A-A^*)^2 \bigg\|^{1/2}\leq w^2(A),$$ where $\|.\|$, $w(.)$ and $c(.)$ are the operator norm, the numerical radius and the Crawford number, respectively. Further, we prove that if $A,D$ are bounded linear operators on a complex Hilbert space, then \begin{eqnarray*} \|AD^*\| \leq \left\| \int_0^1 \left( (1-t) \left(\frac{ |A|^2+|D|^2}{2}\right) +t\|AD^*\|I \right)^2dt \right\|^{1/2} \leq \frac{1}{2}\left\| |A|^2+|D|^2 \right\|, \end{eqnarray*} where $|A|=(A^*A)^{1/2}$ and $|D|=(D^*D)^{1/2}$. This is a refinement of well known inequality obtained by Bhatia and Kittaneh.
Managing construction and commissioning related risks resulting in energy performance gap in commercial buildings
Creators: name: Phung, Van Manh
Publisher: name: Swinburne
Year: 2024

description: This research investigates construction and commissioning related risks leading to energy performance gap in commercial buildings. Energy performance gap, which is a significant problem, is a discrepancy between as-designed and as-built energy performance of a building. The ultimate outcome of this research is a risk management framework, which incorporates all the research findings into a single tool. The framework helps to facilitate the risk management during construction and commissioning of energy-efficient commercial building projects. Therefore, it helps to reduce the chance of energy performance gap occurred. This benefits practitioners, especially contractors and project management, in managing energy-efficient commercial building projects.
Infinitesimal semi-invariant pictures and co-amalgamation
Creators: name: Hanson, Eric J.
name: Igusa, Kiyoshi
name: Kim, Moses
name: Todorov, Gordana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16G20

description: The purpose of this paper is to study the local structure of the semi-invariant picture of a tame hereditary algebra near the null root. Using a construction that we call co-amalgamation, we show that this local structure is completely described by the semi-invariant pictures of a collection of self-injective Nakayama algebras. We then describe the cones of this local structure using cluster-like structures that we call support regular clusters. Finally, we show that the local structure is (piecewise linearly) invariant under cluster tilting.
description: v3: accepted manuscript. v2: improved and expanded exposition, notation, and references; replaced definition of co-amalgamation with a more general version (Definition 2.1.7). 48 pages, 6 figures
Skein and cluster algebras of unpunctured surfaces for $\mathfrak{sl}_3$
Creators: name: Ishibashi, Tsukasa
name: Yuasa, Wataru
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13F60, 57K31 (Primary), 57K20 (Secondary)

description: For an unpunctured marked surface $Σ$, we consider a skein algebra $\mathscr{S}_{\mathfrak{sl}_{3},Σ}^{q}$ consisting of $\mathfrak{sl}_3$-webs on $Σ$ with the boundary skein relations at marked points. We construct a quantum cluster algebra $\mathscr{A}^q_{\mathfrak{sl}_3,Σ}$ inside the skew-field $\mathrm{Frac}\mathscr{S}_{\mathfrak{sl}_{3},Σ}^{q}$ of fractions, which quantizes the cluster $K_2$-structure on the moduli space $\mathcal{A}_{SL_3,Σ}$ of decorated $SL_3$-local systems on $Σ$. We show that the cluster algebra $\mathscr{A}^q_{\mathfrak{sl}_3,Σ}$ contains the boundary-localized skein algebra $\mathscr{S}_{\mathfrak{sl}_{3},Σ}^{q}[\partial^{-1}]$ as a subalgebra, and their natural structures, such as gradings and certain group actions, agree with each other. We also give an algorithm to compute the Laurent expressions of a given $\mathfrak{sl}_3$-web in certain clusters and discuss the positivity of coefficients. In particular, we show that the bracelets and the bangles along an oriented simple loop in $Σ$ have Laurent expressions with positive coefficients, hence give rise to quantum GS-universally positive Laurent polynomials.
description: 65 pages, many TikZ figures; v2: minor corrections, references added; v3: Main Theorem on the comparison of skein and cluster algebras is refined, where an inclusion of the boundary-localized skein algebra into the quantum cluster algebra is given. minor corrections, references added; v4:Title changed, Proof of Theorem 3.12 is revised, minor corrections, references added; to appear in Math. Z
A Discrete-Time Switching System Analysis of Q-learning
Creators: name: Lee, Donghwan
name: Hu, Jianghai
name: He, Niao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper develops a novel control-theoretic framework to analyze the non-asymptotic convergence of Q-learning. We show that the dynamics of asynchronous Q-learning with a constant step-size can be naturally formulated as a discrete-time stochastic affine switching system. Moreover, the evolution of the Q-learning estimation error is over- and underestimated by trajectories of two simpler dynamical systems. Based on these two systems, we derive a new finite-time error bound of asynchronous Q-learning when a constant stepsize is used. Our analysis also sheds light on the overestimation phenomenon of Q-learning. We further illustrate and validate the analysis through numerical simulations.
Logic as an internal organisation of language
Creators: name: Čulina, Boris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics

description: Contemporary semantic description of logic is based on the ontology of all possible interpretations, an insufficiently clear metaphysical concept. In this article, logic is described as the internal organization of language. Logical concepts -- logical constants, logical truths and logical consequence -- are defined using the internal syntactic and semantic structure of language. For a first-order language, it has been shown that its logical constants are connectives and a certain type of quantifiers for which the universal and existential quantifiers form a functionally complete set of quantifiers. Neither equality nor cardinal quantifiers belong to the logical constants of a first-order language.
Grothendieck groups of $d$-exangulated categories and a modified Caldero-Chapoton map
Creators: name: Jørgensen, Peter
name: Shah, Amit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: A strong connection between cluster algebras and representation theory was established by the cluster category. Cluster characters, like the original Caldero-Chapoton (CC) map, are maps from certain triangulated categories to cluster algebras and they have generated much interest. Holm and Jørgensen constructed a modified CC map from a sufficiently nice triangulated category to a commutative ring, which is a generalised frieze under some conditions. In their construction, a quotient $K_{0}^{sp}(\mathcal{T})/M$ of a Grothendieck group of a cluster tilting subcategory $\mathcal{T}$ is used. In this article, we show that this quotient is the Grothendieck group of a certain extriangulated category, thereby exposing the significance of it and the relevance of extriangulated structures. We use this to define another modified CC map that recovers the one of Holm--Jørgensen.
 We prove our results in a higher homological context. Suppose $\mathcal{S}$ is a $(d+2)$-angulated category with subcategories $\mathcal{X}\subseteq\mathcal{T}\subseteq\mathcal{S}$, where $\mathcal{X}$ is functorially finite and $\mathcal{T}$ is $2d$-cluster tilting, satisfying some mild conditions. We show there is an isomorphism between the Grothendieck group $K_{0}(\mathcal{S},\mathbb{E}_{\mathcal{X}},\mathfrak{s}_{\mathcal{X}})$ of the category $\mathcal{S}$, equipped with the $d$-exangulated structure induced by $\mathcal{X}$, and the quotient $K_{0}^{sp}(\mathcal{T})/N$, where $N$ is the higher analogue of $M$ above. When $\mathcal{X}=\mathcal{T}$ the isomorphism is induced by the higher index with respect to $\mathcal{T}$ introduced recently by Jørgensen. Thus, in the general case, we can understand the map taking an object in $\mathcal{S}$ to its $K_{0}$-class in $K_{0}(\mathcal{S},\mathbb{E}_{\mathcal{X}},\mathfrak{s}_{\mathcal{X}})$ as a higher index with respect to the rigid subcategory $\mathcal{X}$.
description: V1: 28 pages. V2: Changes made following a review. There was an error in Remark 2.13 that has now been corrected
UNDERSTANDING THE EFFECT OF SOCIAL MEDIA ADVERTISING VALUES ON ONLINE PURCHASE INTENTION: A CASE STUDY OF BANGKOK, THAILAND
Creators: name: Cattaliya CHAROENSEREECHAI
Publisher: name: Asian Administration and Management Review
Year: 2022
Subjects: Social Media Advertising Value
Consumer Personal Factor
Technology Acceptance
Online Purchase Intention

description: Asian Administration and Management Review, 5, 2, 1-11
Refined inequalities for the numerical radius of Hilbert space operators
Creators: name: Bhunia, Pintu
name: Jana, Suvendu
name: Paul, Kallol
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 47A12, Secondary 47A30

description: We present some new upper and lower bounds for the numerical radius of bounded linear operators on a complex Hilbert space and show that these are stronger than the existing ones. In particular, we prove that if $A$ is a bounded linear operator on a complex Hilbert space $\mathcal{H}$ and if $\Re(A)$, $\Im(A)$ are the real part, the imaginary part of $A$, respectively, then $$ w(A)\geq\frac{\|A\|}{2} +\frac{1}{2\sqrt{2}} \Big | \|\Re(A)+\Im(A)\|-\|\Re(A)-\Im(A)\| \Big | $$ and $$ w^2(A)\geq\frac{1}{4}\|A^*A+AA^*\|+\frac{1}{4}\Big| \|\Re(A)+\Im(A)\|^2-\|\Re(A)-\Im(A)\|^2\Big|. $$ Here $w(.)$ and $\|.\|$ denote the numerical radius and the operator norm, respectively. Further, we obtain refinement of inequalities for the numerical radius of the product of two operators. Finally, as an application of the second inequality mentioned above, we obtain an improvement of upper bound for the numerical radius of the commutators of operators.
Investigating the microbiological risks associated with the food handling practices of raw cow's milk consumers in Australia
Creators: name: Leclair, Roselyn May
Publisher: name: Swinburne
Year: 2024

description: Raw milk can be defined as milk that has not been pasteurised or heat treated. In countries, such as Australia, the demand for unprocessed foods extends to the consumption of raw milk, despite the associated foodborne disease risks. This multidisciplinary research investigated the food handling practices of Australian raw cow's milk consumers and the effect these practices have on the microbiology of raw cow's milk. The results highlight that consumer food handling practices can affect the microbial quality of raw cow's milk and also provided data for public health strategies aimed at reducing the risks of raw cow's milk consumption.
$τ$-perpendicular wide subcategories
Creators: name: Buan, Aslak Bakke
name: Hanson, Eric J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G10, 16G20

description: Let $Λ$ be a finite-dimensional algebra. A wide subcategory of $\mathsf{mod}Λ$ is called left finite if the smallest torsion class containing it is functorially finite. In this paper, we prove that the wide subcategories of $\mathsf{mod}Λ$ arising from $τ$-tilting reduction are precisely the Serre subcategories of left finite wide subcategories. As a consequence, we show that the class of such subcategories is closed under further $τ$-tilting reduction. This leads to a natural way to extend the definition of the "$τ$-cluster morphism category" of $Λ$ to arbitrary finite-dimensional algebras. This category was recently constructed by Buan-Marsh in the $τ$-tilting finite case and by Igusa-Todorov in the hereditary case.
description: v3: final version. v2: Removed Corollary 1.2a and added discussion of a counterexample as Remark 6.17, corrected errors in the proof of Theorem 1.3, and made other small changes to organization and exposition. 22 pages, 2 figures
On the Dynamics of the Tavis-Cummings Model
Creators: name: Dong, Zhiyuan
name: Zhang, Guofeng
name: Wu, Ai-Guo
name: Wu, Re-Bing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The purpose of this paper is to present a comprehensive study of the Tavis-Cummings model from a system-theoretic perspective. A typical form of the Tavis-Cummings model is composed of an ensemble of non-interacting two-level systems (TLSs) that are collectively coupled to a common cavity resonator. The associated quantum linear passive system is proposed, whose canonical form reveals typical features of the Tavis-Cummings model, including $\sqrt{N}$- scaling, dark states, bright states, single-excitation superradiant and subradiant states. The passivity of this linear system is related to the vacuum Rabi mode splitting phenomenon in Tavis-Cummings systems. On the basis of the linear model, an analytic form is presented for the steady-state output state of the Tavis-Cummings model driven by a single-photon state. Master equations are used to study the excitation properties of the Tavis-Cummings model in the multi-excitation scenario. Finally, in terms of the transition matrix for a linear time-varying system, a computational framework is proposed for calculating the state of the Tavis-Cummings model, which is applicable to the multi-excitation case.
description: 16 pages, 8 figures, IEEE Transactions on Automatic Control, to appear
Bi-fidelity stochastic collocation methods for epidemic transport models with uncertainties
Creators: name: Bertaglia, Giulia
name: Liu, Liu
name: Pareschi, Lorenzo
name: Zhu, Xueyu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: Uncertainty in data is certainly one of the main problems in epidemiology, as shown by the recent COVID-19 pandemic. The need for efficient methods capable of quantifying uncertainty in the mathematical model is essential in order to produce realistic scenarios of the spread of infection. In this paper, we introduce a bi-fidelity approach to quantify uncertainty in spatially dependent epidemic models. The approach is based on evaluating a high-fidelity model on a small number of samples properly selected from a large number of evaluations of a low-fidelity model. In particular, we will consider the class of multiscale transport models recently introduced in Bertaglia, Boscheri, Dimarco & Pareschi, Math. Biosci. Eng. (2021) and Boscheri, Dimarco & Pareschi, Math. Mod. Meth. App. Scie. (2021) as the high-fidelity reference and use simple two-velocity discrete models for low-fidelity evaluations. Both models share the same diffusive behavior and are solved with ad-hoc asymptotic-preserving numerical discretizations. A series of numerical experiments confirm the validity of the approach.
Natural orbital impurity solver for real-frequency properties at finite temperature
Creators: name: Kitatani, Motoharu
name: Sakai, Shiro
name: Arita, Ryotaro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We extend the natural orbital impurity solver [PRB 90, 085102 (2014)] to finite temperatures and apply it to calculate spectral and transport properties of correlated electrons within the dynamical mean-field theory. First, we benchmark our method against the exact diagonalization result for small clusters, finding that the natural orbital scheme works well not only for zero temperature but for low finite temperatures. The method yields smooth and sufficiently accurate spectra, which agree well with the results of the numerical renormalization group. Using the smooth spectra, we calculate the electric conductivity and Seebeck coefficient for the two-dimensional Hubbard model at low temperatures which are in the scope of many experiments and practical applications. These results demonstrate the usefulness of the natural orbital framework for obtaining the real frequency information of correlated electron systems.
description: 8 pages, 7 figures