cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A fractional Hawkes process II: Further characterization of the process
Creators: name: Habyarimana, Cassien
name: Aduda, Jane A.
name: Scalas, Enrico
name: Chen, Jing
name: Hawkes, Alan G.
name: Polito, Federico
Publisher: name: arXiv
Year: 2022
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60G55, 26A33

description: We characterize a Hawkes point process with kernel proportional to the probability density function of Mittag-Leffler random variables. This kernel decays as a power law with exponent $β+1 \in (1,2]$. Several analytical results can be proved, in particular for the expected intensity of the point process and for the expected number of events of the counting process. These analytical results are used to validate algorithms that numerically invert the Laplace transform of the expected intensity as well as Monte Carlo simulations of the process. Finally, Monte Carlo simulations are used to derive the full distribution of the number of events. The algorithms used for this paper are available at {\tt https://github.com/habyarimanacassien/Fractional-Hawkes}.
description: 19 pages, 6 figures. This version includes the exact inversion of a Laplace transform that we previously inverted only numerically
Existence of torsional solitons in a beam model of suspension bridge
Creators: name: Benci, Vieri
name: Fortunato, Donato
name: Gazzola, Filippo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 74J35, 35C08, 35Q74, 35A15, 35B35

description: This paper studies the existence of solitons, namely stable solitary waves, in a suspension bridge. The bridge is modeled as a degenerate plate, that is, a central beam with cross sections, and displays two degrees of freedom: the vertical displacement of the beam and the torsional angles of the cross sections. Under fairy general assumptions, we prove the existence of solitons. Under the additional assumption of large tension in the sustaining cables, we prove that these solitons have a nontrivial torsional component. This appears relevant for the security since several suspension bridges collapsed due to torsional oscillations.
description: This paper has been withdrawn by the authors due to a wrong esimate in lemma 18
On Smith normal forms of $q$-Varchenko matrices
Creators: name: Boulware, Naomi
name: Jing, Naihuan
name: Misra, Kailash C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper, we investigate $q$-Varchenko matrices for some hyperplane arrangements with symmetry in two and three dimensions, and prove that they have a Smith normal form over $\mathbb Z[q]$. In particular, we examine the hyperplane arrangement for the regular $n$-gon in the plane and the dihedral model in the space and Platonic polyhedra. In each case, we prove that the $q$-Varchenko matrix associated with the hyperplane arrangement has a Smith normal form over $\mathbb Z[q]$ and realize their congruent transformation matrices over $\mathbb Z[q]$ as well.
description: 22 pages, 8 figures
HIghMass - High HI Mass, HI-Rich Galaxies at $z\sim0$: Combined HI and H$_2$ Observations
Creators: name: Hallenbeck, Gregory
name: Huang, Shan
name: Spekkens, Kristine
name: Haynes, Martha P.
name: Giovanelli, Riccardo
name: Adams, Elizabeth A. K.
name: Brinchmann, Jarle
name: Carpenter, John
name: Chengalur, Jayaram
name: Hunt, Leslie K.
name: Masters, Karen L.
name: Saintonge, Amélie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present resolved HI and CO observations of three galaxies from the HIghMass sample, a sample of HI-massive ($M_{HI} > 10^{10} M_\odot$), gas-rich ($M_{HI}$ in top $5\%$ for their $M_*$) galaxies identified in the ALFALFA survey. Despite their high gas fractions, these are not low surface brightness galaxies, and have typical specific star formation rates (SFR$/M_*$) for their stellar masses. The three galaxies have normal star formation rates for their HI masses, but unusually short star formation efficiency scale lengths, indicating that the star formation bottleneck in these galaxies is in the conversion of HI to H$_2$, not in converting H$_2$ to stars. In addition, their dark matter spin parameters ($λ$) are above average, but not exceptionally high, suggesting that their star formation has been suppressed over cosmic time but are now becoming active, in agreement with prior H$α$ observations.
description: 20 pages, 13 figures
Evaluating Emerging CXL-enabled Memory Pooling for HPC Systems
Creators: name: Wahlgren, Jacob
name: Gokhale, Maya
name: Peng, Ivy B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Current HPC systems provide memory resources that are statically configured and tightly coupled with compute nodes. However, workloads on HPC systems are evolving. Diverse workloads lead to a need for configurable memory resources to achieve high performance and utilization. In this study, we evaluate a memory subsystem design leveraging CXL-enabled memory pooling. Two promising use cases of composable memory subsystems are studied -- fine-grained capacity provisioning and scalable bandwidth provisioning. We developed an emulator to explore the performance impact of various memory compositions. We also provide a profiler to identify the memory usage patterns in applications and their optimization opportunities. Seven scientific and six graph applications are evaluated on various emulated memory configurations. Three out of seven scientific applications had less than 10% performance impact when the pooled memory backed 75% of their memory footprint. The results also show that a dynamically configured high-bandwidth system can effectively support bandwidth-intensive unstructured mesh-based applications like OpenFOAM. Finally, we identify interference through shared memory pools as a practical challenge for adoption on HPC systems.
description: 10 pages, 13 figures. Accepted for publication in Workshop on Memory Centric High Performance Computing (MCHPC'22) at SC22
Multi-Fidelity Cost-Aware Bayesian Optimization
Creators: name: Foumani, Zahra Zanjani
name: Shishehbor, Mehdi
name: Yousefpour, Amin
name: Bostanabad, Ramin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Bayesian optimization (BO) is increasingly employed in critical applications such as materials design and drug discovery. An increasingly popular strategy in BO is to forgo the sole reliance on high-fidelity data and instead use an ensemble of information sources which provide inexpensive low-fidelity data. The overall premise of this strategy is to reduce the overall sampling costs by querying inexpensive low-fidelity sources whose data are correlated with high-fidelity samples. Here, we propose a multi-fidelity cost-aware BO framework that dramatically outperforms the state-of-the-art technologies in terms of efficiency, consistency, and robustness. We demonstrate the advantages of our framework on analytic and engineering problems and argue that these benefits stem from our two main contributions: (1) we develop a novel acquisition function for multi-fidelity cost-aware BO that safeguards the convergence against the biases of low-fidelity data, and (2) we tailor a newly developed emulator for multi-fidelity BO which enables us to not only simultaneously learn from an ensemble of multi-fidelity datasets, but also identify the severely biased low-fidelity sources that should be excluded from BO.
Resource levelling with project management software
Creators: name: Burley, Elizabeth Margaret.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Mutual information of excited states and relative entropy of two disjoint subsystems in CFT
Creators: name: Ugajin, Tomonori
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we first study mutual information of excited states in the small subsystem size limit in generic conformal field theory. We then discuss relative entropy of two disjoint subsystems in the same limit.
description: 18 pages
KSS-ICP: Point Cloud Registration based on Kendall Shape Space
Creators: name: Lv, Chenlei
name: Lin, Weisi
name: Zhao, Baoquan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Point cloud registration is a popular topic which has been widely used in 3D model reconstruction, location, and retrieval. In this paper, we propose a new registration method, KSS-ICP, to address the rigid registration task in Kendall shape space (KSS) with Iterative Closest Point (ICP). The KSS is a quotient space that removes influences of translations, scales, and rotations for shape feature-based analysis. Such influences can be concluded as the similarity transformations that do not change the shape feature. The point cloud representation in KSS is invariant to similarity transformations. We utilize such property to design the KSS-ICP for point cloud registration. To tackle the difficulty to achieve the KSS representation in general, the proposed KSS-ICP formulates a practical solution that does not require complex feature analysis, data training, and optimization. With a simple implementation, KSS-ICP achieves more accurate registration from point clouds. It is robust to similarity transformation, non-uniform density, noise, and defective parts. Experiments show that KSS-ICP has better performance than the state of the art.
description: 13 pages, 20 figures
Deliverable 4.4 PESTEL Analysis
Creators: name: EIT Digital
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Cybersecurity
subject: Data Management
subject: Innovation
subject: Digital transformation

description: This public deliverable is part of the COcyber Work Package (WP) 4 dedicated to ”Know-how, good practice sharing and information transfer activities” led by Université Libre de Buxelles / Solvay Business School. This report was prepared by EIT Digital in the framework of task 4.3 PESTEL analysis and policy recommendations. 

Abstract

This report presents the Political, Economic, Social, Technological, Legal and Environmental (PESTEL) analysis of the whole cybersecurity sector (both on the defence and civilian sides) to identify aspects affecting cyber governance and the development of cybersecurity technology and information transfer in Europe. It will inform all stakeholders about the gaps and opportunities in Europe’s cybersecurity sector and help design coherent policy recommendations.

COcyber is a two-year initiative supported by the European Commission and European Cybersecurity Competence Centre to foster the collaboration of civilian and defence cybersecurity sectors.  

 

Disclaimer

The COcyber project funded under Grant Agreement No. 101158606 is supported by the European Cybersecurity Competence Centre and funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Cybersecurity Competence Centre. Neither the European Union nor the European Cybersecurity Competence Centre can be held responsible for them. 

The contents of this deliverable are presented for informational purposes only and are subject to the pending approval of the European Commission (EC). The information, data, and conclusions presented herein may undergo revisions or modifications following the review and approval process by the European Commission. Recipients of this document are advised that any actions, decisions, or reliance on the information provided should be exercised with caution until the final approval from the European Commission is obtained. The authors and distributors of this deliverable shall not be held liable for any consequences arising from the use of information that has not yet received official European Commission approval.
Replica Trick Calculation for Entanglement Entropy of Static Black Hole Spacetimes
Creators: name: Prihadi, Hadyan Luthfan
name: Zen, Freddy Permana
name: Ariwahjoedi, Seramika
name: Dwiputra, Donny
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the entanglement entropy between two (maximally-extended) spacetime regions of static black hole, seperated by horizon. As a first case, we consider the Schwarzschild black hole, and then we extend the calculations to the charged Reissner- Nordstrom and Schwarzschild-de Sitter black holes with more than one horizon. The case for static and spherically-symmetric solution to the more general F (R) gravity is also considered. The calculation of the entanglement entropy is performed using the replica trick by obtaining the explicit form of the metric which corresponds to the replica spacetime for each black hole under consideration. The calculation of static and spherically-symmetric black holes result in the entanglement entropy that matches the Bekenstein-Hawking area law entropy.
description: 41 pages, 12 figures, minor revision, accepted for publication in International Journal of Geometric Methods in Modern Physics
Photospheric response to EB-like event
Creators: name: Danilovic, S.
name: Solanki, S. K.
name: Barthol, P.
name: Gandorfer, A.
name: Gizon, L.
name: Hirzberger, J.
name: van Noort, T. L. Riethmüller M.
name: Rodríguez, J. Blanco
name: Iniesta, J. C. Del Toro
name: Suárez, D. Orozco
name: Schmidt, W.
name: Pillet, V. Martínez
name: Knölker, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Ellerman Bombs are signatures of magnetic reconnection, which is an important physical process in the solar atmosphere. How and where they occur is a subject of debate. In this paper we analyse Sunrise/IMaX data together with 3D MHD simulations that aim to reproduce the exact scenario proposed for the formation of these features. Although the observed event seems to be more dynamic and violent than the simulated one, simulations clearly confirm the basic scenario for the production of EBs. The simulations also reveal the full complexity of the underlying process. The simulated observations show that the Fe I 525.02 nm line gives no information on the height where reconnection takes place. It can only give clues about the heating in the aftermath of the reconnection. The information on the magnetic field vector and velocity at this spatial resolution is, however, extremely valuable because it shows what numerical models miss and how they can be improved.
description: accepted in ApJS after minor changes; movies: http://www2.mps.mpg.de/data/outgoing/danilovic/ebs/
The grounded Martin's axiom
Creators: name: Habič, Miha E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E50, 03E17, 03E57

description: We introduce a variant of Martin's axiom, called the grounded Martin's axiom, which asserts that the universe is a ccc forcing extension in which Martin's axiom holds for posets in the ground model. This principle already implies several of the combinatorial consequences of Martin's axiom. The new axiom is shown to be consistent with the failure of Martin's axiom and a singular continuum. We prove that the grounded Martin's axiom is preserved in a strong way when adding a Cohen real and that adding a random real to a model of Martin's axiom preserves the grounded version (even though it destroys Martin's axiom itself). We also consider the analogous variant of the proper forcing axiom.
description: 22 pages
Extended fractional cumulative past and paired phi-entropy measures
Creators: name: Saha, Shital
name: Kayal, Suchandan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Very recently, extended fractional cumulative residual entropy (EFCRE) has been proposed by Foroghi et al. (2022). In this paper, we introduce extended fractional cumulative past entropy (EFCPE), which is a dual of the EFCRE. The newly proposed measure depends on the logarithm of fractional order and the cumulative distribution function (CDF). Various properties of the EFCPE have been explored. This measure has been extended to the bivariate setup. Furthermore, the conditional EFCPE is studied and some of its properties are provided. The EFCPE for inactivity time has been proposed. In addition, the extended fractional cumulative paired phi-entropy has been introduced and studied. The proposed EFCPE has been estimated using empirical CDF. Furthermore, the EFCPE is studied for coherent systems. A validation of the proposed measure is provided using logistic map. Finally, an application is reported.
ITCC : a solution to the difficulties of transferring Chinese characters and preservation of font fidelity over the internet
Creators: name: Qin, Richard .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Late-time constraints on modified Gauss-Bonnet cosmology
Creators: name: Bajardi, Francesco
name: D'Agostino, Rocco
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we consider a gravitational action containing a combination of the Ricci scalar, $R$, and the topological Gauss--Bonnet term, $G$. Specifically, we study the cosmological features of a particular class of modified gravity theories selected by symmetry considerations, namely the $f(R,G)= R^n G^{1-n}$ model. In the context of a spatially flat, homogeneous and isotropic background, we show that the currently observed acceleration of the Universe can be addressed through geometry, hence avoiding \emph{de facto} the shortcomings of the cosmological constant. We thus present a strategy to numerically solve the Friedmann equations in presence of pressureless matter and obtain the redshift behavior of the Hubble expansion rate. Then, to check the viability of the model, we place constraints on the free parameters of the theory by means of a Bayesian Monte Carlo method applied to late-time cosmic observations. Our results show that the $f(R,G)$ model is capable of mimicking the low-redshift behavior of the standard $Λ$CDM model, though substantial differences emerge when going toward high redshifts, leading to the absence of a standard matter-dominated epoch. Finally, we investigate the energy conditions and show that, under suitable choices for the values of the cosmographic parameters, they are all violated when considering the mean value of $n$ obtained from our analysis, as occurs in the case of a dark fluid.
description: 11 pages, 3 figures, 1 table. Accepted for publication in General Relativity and Gravitation
Annex 7. CLEARING HOUSE project logo and template Powerpoint
Creators: name: Shafau, Motunrayo
name: Jin, Jiali
name: Maurice, Suzi
name: Davies, Clive
name: De Vreese, Rik
Publisher: name: Zenodo
Year: 2020

description: This file is an annex to the Guidance document for the local co-design and co-learning workshops (D3.1) (https://www.zenodo.org/deposit/3887161). The Guidance document gives guidelines for organising co-design workshops. This Annex 7 includes the CLEARING HOUSE presentation template and CLEARING HOUSE logos.
Enhancing Traffic Efficiency of Mixed Traffic Using Control-based and Learning-based Connected and Autonomous Systems
Creators: name: Ha, Young Joun
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 400512
subject: Transport engineering

description: Inefficient traffic operations have far-reaching consequences in not just travel mobility but also public health, social equity, and economic prosperity. Congestion, a key symptom of inefficient operations, can lead to increased emissions, accidents, and productivity loss. Therefore, advancements and policies in transportation engineering require careful scrutiny to not only prevent unintended adverse consequences but also capitalize on opportunities for improvement. In spite of significant efforts to enhance traffic mobility and safety, human control of vehicles remains prone to errors such as inattention, impatience, and intoxication. Connected and autonomous vehicles (CAVs) are seen as a great opportunity to address human-related inefficiencies. This dissertation focuses on connectivity and automation and investigates the synergies between technologies. First, a deep reinforcement learning based strategy is proposed herein to enable agents to address the dynamic nature of inputs in traffic environments and to capture proximal and distant information, and to facilitate learning in rapidly changing traffic. The strategy is applied to alleviate congestion at highway bottlenecks by training a small number of CAVs to cooperatively reduce congestion through deep reinforcement learning. Secondly, to address congestion at intersections, the dissertation introduces a fog-based graphic RL (FG-RL) framework. This approach allows traffic signals across multiple intersections to form a cooperative coalition, sharing information for signal timing prescriptions. Large-scale traffic signal optimization is computationally inefficient, so the proposed FG-RL approach breaks down networks into smaller fog nodes that function as local centralization points within a decentralized system Doing so allows for a bottom-up solution approach for decomposing large traffic networks. Furthermore, the dissertation pioneers the notion of using a small CAV fleet, selected from any existing shared autonomous mobility services (SAMSs) to assist city road agencies to achieve string-stable driving in locally congested urban traffic. These vehicles are dispersed throughout the network to perform their primary function of providing ride-share services. However, when they encounter severe congestion, they act cooperatively with each other to be rerouted and to undertake traffic-stabilizing maneuvers to smoothen the traffic and reduce congestion. The smoothing behavior is learned through DRL, while the rerouting is facilitated through the proposed constrained entropy-based dynamic AV routing algorithm (CEDAR).
A Novel Architecture for room temperature microwave optomechanical experiments
Creators: name: Kumar, Sumit
name: Spence, Sebastian
name: Perrett, Simon
name: Tahir, Zaynab
name: Singh, Angadjit
name: Qi, Chichi
name: Vizan, Sara Perez
name: Rojas, Xavier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have developed a novel architecture for room temperature microwave cavity optomechanics, which is based on the coupling of a 3D microwave reentrant cavity to a compliant membrane. Devices parameters have enabled resolving the thermomechanical motion of the membrane, and observing optomechanically induced transparency/absorption in the linear regime, for the first time in a microwave optomechanical system operated at room temperature. We have extracted the single photon coupling rate (g0) using four independent measurement techniques, and hence obtain a full characterization of the proposed cavity optomechanical system.
Constant-Tune Cyclotrons
Creators: name: Planche, Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: In this paper we demonstrate that cyclotrons can be made to have precisely constant betatron tunes over wide energy ranges. In particular, we show that the horizontal tune can be made constant and does not have to follow the Lorentz factor gamma, while still perfectly satisfying the isochronous condition. To make this demonstration we developed a technique based on the calculation of the betatron tunes entirely from the geometry of realistic non-hard-edge closed orbits. We present two particular cyclotron designs, one compact cyclotron and one ring cyclotron. The compact cyclotron design is backed up by a 3-dimensional finite element magnet calculation, that we also present here.
Scale-friendly In-network Coordination
Creators: name: Sagkriotis, Stefanos
name: Pezaros, Dimitrios
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The programmability of modern network devices has led to innovative research in the area of in-network computing, i.e., offloading certain computations to the programmable data plane. Key-value stores, which offer coordination services for many large-scale data centres, benefited from this technological advancement. Previous research reduced the response latency of key-value requests by half through deploying the store in the programmable data plane. In this work, we identify previous design decisions that have led to increased traffic generation and latency for in-network coordination services. We have developed a new in-network key-value store platform that maintains strong consistency and fault-tolerance, while improving performance and scalability over the state-of-the-art. We have designed and implemented the platform in P4, and analysed the optimisations that unlock these performance improvements. Our evaluation shows a reduction of up to orders of magnitude in latency and significant improvements in throughput. We obtain up to nine times higher throughput for scenarios with multiple participating nodes, indicative of the superior scalability the platform can offer.
description: \c{opyright} 20XX IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Absolute continuity of the law for solutions of stochastic differential equations with boundary noise
Creators: name: Bonaccorsi, Stefano
name: Zanella, Margherita
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H15, 60H07

description: We study existence and regularity of the density for the solution $u(t,x)$ (with fixed $t > 0$ and $x \in D$) of the heat equation in a bounded domain $D \subset \mathbb R^d$ driven by a stochastic inhomogeneous Neumann boundary condition with stochastic term. The stochastic perturbation is given by a fractional Brownian motion process. Under suitable regularity assumptions on the coefficients, by means of tools from the Malliavin calculus, we prove that the law of the solution has a smooth density with respect to the Lebesgue measure in $\mathbb R$.
description: 25 pages
Two-Dimensional Freeform Reflector Design with a Scattering Surface
Creators: name: Kronberg, Vì
name: Anthonissen, Martijn
name: Boonkkamp, Jan ten Thije
name: IJzerman, Wilbert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Graphics (cs.GR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: 78A05, 78A45, 78A46

description: We combine two-dimensional freeform reflector design with a scattering surface modelled using microfacets, i.e., small specular surfaces representing surface roughness. The model results in a convolution integral for the scattered light intensity distribution, which yields an inverse specular problem after deconvolution. Thus, the shape of a reflector with a scattering surface may be computed using deconvolution, followed by solving the typical inverse problem of specular reflector design.
Typical length scales in conducting disorderless networks
Creators: name: Martínez-Mares, M.
name: Domínguez-Rocha, V.
name: Robledo, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We take advantage of a recently established equivalence, between the intermittent dynamics of a deterministic nonlinear map and the scattering matrix properties of a disorderless double Cayley tree lattice of connectivity $K$, to obtain general electronic transport expressions and expand our knowledge of the scattering properties at the mobility edge. From this we provide a physical interpretation of the generalized localization length.
description: 12 pages, 3 figures
Robustness of reported postacute health outcomes in children with SARS-CoV-2 infection : a systematic review
Creators: name: Hirt, Julian
name: Janiaud, Perrine
name: Gloy, Viktoria Luise
name: Schandelmaier, Stefan
name: Pereira, Tiago V.
name: Contopoulos-Ioannidis, Despina
name: Goodman, Steven N.
name: Ioannidis, John P. A.
name: Munkholm, Klaus
name: Hemkens, Lars Gerrit
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 616

description: To systematically assess the robustness of reported postacute SARS-CoV-2 infection health outcomes in children. A search on PubMed and Web of Science was conducted to identify studies published up to 22 January 2022 that reported on postacute SARS-CoV-2 infection health outcomes in children (<18 years) with follow-up of ≥2 months since detection of infection or ≥1 month since recovery from acute illness. We assessed the consideration of confounding bias and causality, as well as the risk of bias. 21 studies including 81 896 children reported up to 97 symptoms with follow-up periods of 2.0–11.5 months. Fifteen studies had no control group. The reported proportion of children with post-COVID syndrome was between 0% and 66.5% in children with SARS-CoV-2 infection (n=16 986) and between 2.0% and 53.3% in children without SARS-CoV-2 infection (n=64 910). Only two studies made a clear causal interpretation of an association between SARS-CoV-2 infection and the main outcome of ‘post-COVID syndrome’ and provided recommendations regarding prevention measures. The robustness of all 21 studies was seriously limited due to an overall critical risk of bias. The robustness of reported postacute SARS-CoV-2 infection health outcomes in children is seriously limited, at least in all the published articles we could identify. None of the studies provided evidence with reasonable certainty on whether SARS-CoV-2 infection has an impact on postacute health outcomes, let alone to what extent. Children and their families urgently need much more reliable and methodologically robust evidence to address their concerns and improve care.
Microbiological Quality Profile of Goat's Raw Milk Cheese during Ripening as affected by its Intrinsic Properties
Creators: name: Faria, A.S.
name: Coelho-Fernandes, S.
name: Rodrigues, G.
name: Fernandes, A.
name: Barros, L.
name: Cadavez, V.
name: Gonzales-Barron, U.
Publisher: name: Zenodo
Year: 2022

description: Presented as Oral Presentation; and in Book of Abstracts of the 12th International Conference on Simulation and Modelling
 in the Food and Bio-Industry (FOODSIM'2022). Ghent, Belgium (3-6 April 2022) (Page 46).
Gateway-like absurdly-benign traversable wormhole solutions
Creators: name: Mehta, Abhishek Kumar
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A class of wormhole solutions is constructed that has restricted polar degrees of freedom to achieve a gateway-like configuration. This compels the use of distribution-valued metrics and connections which further compels the use of neutrix product of distributions, to define distribution-valued curvature, Einstein tensor, and other relevant quantities. The solution demands a spacetime with non-Riemannian effects like non-metricity to be consistent and well-defined, due to the non-associativity of the neutrix product. Finally, the ideal gateway configuration where the negative energy requirement is zero is derived.
description: 24 pages, Accepted for print in the 'Theoretical and Mathematical Physics' (Russian Academy of Sciences)
UPSKILLS gamification guideline
Creators: name: Soldatić, Nađa
Publisher: name: Zenodo
Year: 2022

description: Gamification is the strategy for influencing and motivating the behavior of students, which also includes teachers. Gamification can be applied across a broad spectrum of situations where individuals need to be motivated to pursue specific actions or activities. Game elements make a student’s job more transparent by making goals clear and easy to follow. A student is able to see progress on performance, receive immediate feedback on accomplishments and connect with colleagues through collaboration and competition. These guidelines summarise the content available on the UPSKILLS project Moodle platform.
Constraints on neutron skin thickness and nuclear deformations using relativistic heavy-ion collisions from STAR
Creators: name: Xu, Haojie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In these proceedings, we present the measurements of neutron skin thickness and nuclear deformation using isobar $^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr collisions at $\sqrt{s_{_{\rm NN}}}=200$ GeV by the STAR detector. The significant deviations from unity of the isobar ratios of elliptic flow $v_{2}$, triangular flow $v_{3}$, mean $p_{\rm T}$ fluctuations $\langleδp_{\rm T}^{2}\rangle/\langle p_{\rm T}\rangle^{2}$, and asymmetric cumulant ${\rm ac}_{2}\{3\}$ indicate large differences in their quadrupole and octuple deformations. The significant deviations of the isobar ratios of produced hadron multiplicity $N_{\rm ch}$, mean transverse momentum $\langle p_{\rm T}\rangle$, and net charge number $ΔQ$ indicate a halo-type neutron skin for the Zr nucleus, much thicker than for the Ru nucleus, consistent with nuclear structure calculations. We discuss how we extract the neutron skin thickness, the symmetry energy slope parameter, and deformation parameters from data.
description: Presented at Quark Matter 2022, Karkow, Poland, April 4-10, 2022
Groupware for a small research group
Creators: name: Yin, Chhy C.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Wireless Information Surveillance via Proactive Eavesdropping with Spoofing Relay
Creators: name: Zeng, Yong
name: Zhang, Rui
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Wireless information surveillance, by which suspicious wireless communications are closely monitored by legitimate agencies, is an integral part of national security. To enhance the information surveillance capability, we propose in this paper a new proactive eavesdropping approach via a spoofing relay, where the legitimate monitor operates in a full-duplex manner with simultaneous eavesdropping and spoofing relaying to vary the source transmission rate in favor of the eavesdropping performance. To this end, a power splitting receiver is proposed, where the signal received at each antenna of the legitimate monitor is split into two parts for information eavesdropping and spoofing relaying, respectively. We formulate an optimization problem to maximize the achievable eavesdropping rate by jointly optimizing the power splitting ratios and relay beamforming matrix at the multi-antenna monitor. Depending on the suspicious and eavesdropping channel conditions, the optimal solution corresponds to three possible spoofing relay strategies, namely \emph{constructive relaying}, \emph{jamming}, and \emph{simultaneous jamming and destructive relaying}. Numerical results show that the proposed technique significantly improves the eavesdropping rate of the legitimate monitor as compared to the existing passive eavesdropping and jamming-based eavesdropping schemes.
description: 13 pages, 8 figures, submitted for possible journal publication
Higgs information in Split-SUSY at the LHC
Creators: name: Gupta, Surabhi
name: Gupta, Sudhir Kumar
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Information theory turns out to be an interesting tool for studying the consequences of Higgs observations to various new physics candidate theories by means of the information measure as the entropy of Higgs-Boson through its various detection modes at the Large Hadron Collider. The present article investigates the parameter space of a supersymmetric scenario where sfermions and one of the Higgs superfields are decoupled, while the gauginos, Higgsinos, and the remaining Higgs doublet are still allowed to be lighter. Our analysis reveals that this is quite a viable choice in the light of LHC discovery of a Higgs which resembles the SM Higgs-Boson and nothing else so far. While the supersymmetry breaking scale $M_S$ could be as high as $10^{11}$ GeV or so, the most preferred values of the $M_{S}$ and $\tanβ$ are found to be around 3.6$\times10^7$ GeV and $41$ respectively, which is also consistent with the relic abundance of the neutralino dark matter. The corresponding value of neutralino ($ m_{\tildeχ^{0}_{1}}$) LSP is estimated to be around 1.01 TeV. The preferred values of other parameters, namely, the Higgsino mass ($μ$) and gaugino mass parameters ($M_1$ and $M_2$) are found to be about 1.05 TeV, 1.74 TeV, and 2.57 TeV, respectively.
description: 13 pages, 3 figures, 3 tables
Status of the Schwarzchild-Couder Medium-Sized Telescope for the Cherenkov Telescope Array
Creators: name: Benbow, W.
name: Otte, A. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Cherenkov Telescope Array (CTA) is planned to be the next-generation very-high-energy (VHE; E > 100 GeV) gamma-ray observatory. It is anticipated that CTA will improve upon the sensitivity of the current generation of VHE experiments, such as VERITAS, HESS and MAGIC, by an order of magnitude. CTA is planned to consist of two graded arrays of Cherenkov telescopes with three primary-mirror sizes. A proof-of-concept telescope, based on the dual-mirror Schwarzchild-Couder design, is being constructed on the VERITAS site at the F.L. Whipple Observatory in southern Arizona, USA, and is a candidate design for the medium-sized telescopes. The construction of the telescope will be completed in early 2017, and the status of this project is presented here.
description: 6 pages; 7 multi-panel figures; Contribution to the 6th International Symposium on High Energy Gamma-Ray Astronomy (Gamma2016), Heidelberg, Germany. To be published in the AIP Conference Proceedings
Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5 and Trumpler 20
Creators: name: Lucertini, F.
name: Monaco, L.
name: Caffau, E.
name: Mucciarelli, A.
name: Villanova, S.
name: Bonifacio, P.
name: Sbordone, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Sulfur (S) is one of the lesser-studied $α$-elements. Published investigations of its behavior have so far focused on local stars, and only a few clusters of the Milky Way have been considered to study this topic. We aim to study the S content of the globular cluster Ruprecht 106 -- which has never before been studied for this purpose, but is known to present low levels of the [$α$/Fe] abundance ratio -- and the open cluster Trumpler 5. The only star studied so far in Trumpler 5 shows an unexpectedly low abundance of S. Aims. With this work, we aim to provide the first S abundance in Ruprecht 106 and to investigate the S content of Trumpler 5 with a larger sample of stars. The open cluster Trumpler 20 is considered as a reference object. Methods. We performed a standard abundance analysis based on 1D model atmospheres in local thermodynamical equilibrium (LTE) and on high-resolution and high-signal-to-noise-ratio UVES-slit and UVES/FLAMES spectra. We also applied corrections for nonLTE. The metallicities of the targets were obtained by studying equivalent widths. Sulfur abundances were derived from multiplets 1, 6, and 8 by spectrosynthesis. Results. We find that the metallicities of Ruprecht 106 and Trumpler 5 are [Fe/H]= -1.37+/-0.11 and [Fe/H]= -0.49+/-0.14, respectively. Ruprecht 106 is less S-rich than the other Galactic clusters at similar metallicity. The low S content of Ruprecht 106, [S/Fe]NLTE= -0.52+/-0.13, is consistent with its shortage of $α$-elements. This supports an extra-galactic origin of this cluster. We obtained a new and more robust S content value of Trumpler 5 of about [S/Fe]NLTE= 0.05+/-0.20. According to our results, Trumpler 5 follows the trend of the Galactic disk in the [S/Fe]LTE versus [Fe/H] diagram. Our results for Trumpler 20, of namely [Fe/H]= 0.06+/-0.15 and [S/Fe]NLTE= -0.28+/-0.21, are in agreement with those in the literature.
description: 15 pages, 7 figures, 5 tables
Simultaneous Reconstruction and Segmentation for Dynamic SPECT Imaging
Creators: name: Burger, Martin
name: Rossmanith, Carolin
name: Zhang, Xiaoqun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This work deals with the reconstruction of dynamic images that incorporate characteristic dynamics in certain subregions, as arising for the kinetics of many tracers in emission tomography (SPECT, PET). We make use of a basis function approach for the unknown tracer concentration by assuming that the region of interest can be divided into subregions with spatially constant concentration curves. Applying a regularized variational framework reminiscent of the Chan-Vese model for image segmentation we simultaneously reconstruct both the labelling functions of the subregions as well as the subconcentrations within each region. Our particular focus is on applications in SPECT with Poisson noise model, resulting in a Kullback-Leibler data fidelity in the variational approach. We present a detailed analysis of the proposed variational model and prove existence of minimizers as well as error estimates. The latter apply to a more general class of problems and generalize existing results in literature since we deal with a nonlinear forward operator and a nonquadratic data fidelity. A computational algorithm based on alternating minimization and splitting techniques is developed for the solution of the problem and tested on appropriately designed synthetic data sets. For those we compare the results to those of standard EM reconstructions and investigate the effects of Poisson noise in the data.
A Strongly Correlated Quantum-Dot Heat Engine with Optimal Performance: An Non-equilibrium Green's function Approach
Creators: name: Verma, Sachin
name: Ajay
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an analytical study of a strongly correlated quantum dot-based thermoelectric particle-exchange heat engine for both finite and infinite on-dot Coulomb interaction. Employing Keldysh's non-equilibrium Green's function formalism for different decoupling schemes in the equation of motion, we have analyzed the thermoelectric properties within the non-linear transport regime. As the simplest mean-field approximation is insufficient for analyzing thermoelectric properties in the Coulomb blockade regime, one needs to employ a higher-order approximation to study strongly correlated QD-based heat engines. Therefore initially, we have used the Hubbard-\Romannum{1} approximation to study the quantum dot level position ($ε_d$), thermal gradient ($ΔT$), and on-dot Coulomb interaction ($U$) dependence of the thermoelectric properties. Furthermore, as a natural extension, we have used an approximation beyond Hubbard-\Romannum{1} in the infinite-$U$ limit (strong on-dot Coulomb repulsion) to provide additional insight into the operation of a more practical quantum dot heat engine. Within this infinite-$U$ limit, we examine the role of the symmetric dot-reservoir tunneling ($Γ$) and external serial load resistance ($R$) in optimizing the performance of the strongly correlated quantum dot heat engine. Our infinite-$U$ results show a good quantitative agreement with recent experimental data for a quantum dot coupled to two metallic reservoirs.
description: 14 pages 7 figures
$\mathcal{N}=4$ SYM, (super)-polynomial rings and emergent quantum mechanical symmetries
Creators: name: Koch, Robert de Mello
name: Ramgoolam, Sanjaye
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The structure of half-BPS representations of psu$(2,2|4)$ leads to the definition of a super-polynomial ring $\mathcal{R}(8|8)$ which admits a realisation of psu$(2,2|4)$ in terms of differential operators on the super-ring. The character of the half-BPS fundamental field representation encodes the resolution of the representation in terms of an exact sequence of modules of $\mathcal{R}(8|8)$. The half-BPS representation is realized by quotienting the super-ring by a quadratic ideal, equivalently by setting to zero certain quadratic polynomials in the generators of the super-ring. This description of the half-BPS fundamental field irreducible representation of psu$(2,2|4)$ in terms of a super-polynomial ring is an example of a more general construction of lowest-weight representations of Lie (super-) algebras using polynomial rings generated by a commuting subspace of the standard raising operators, corresponding to positive roots of the Lie (super-) algebra. We illustrate the construction using simple examples of representations of su(3) and su(4). These results lead to the definition of a notion of quantum mechanical emergence for oscillator realisations of symmetries, which is based on ideals in the ring of polynomials in the creation operators.
description: 60 pages, no figures; v2: Mathematica notebook added to submission