cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Search for R-parity-violating supersymmetry in events with four or more leptons in sqrt(s) = 7 TeV pp collisions with the ATLAS detector
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for new phenomena in final states with four or more leptons (electrons or muons) is presented. The analysis is based on 4.7 fb^-1 of sqrt(s) = 7 TeV proton-proton collisions delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in two signal regions: one that requires moderate values of missing transverse momentum and another that requires large effective mass. The results are interpreted in a simplified model of R-parity-violating supersymmetry in which a 95% CL exclusion region is set for charged wino masses up to 540 GeV. In an R-parity-violating MSUGRA/CMSSM model, values of m_1/2 up to 820 GeV are excluded for 10
description: 19 pages plus author list (41 pages total), 3 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2012-17/ Revision corresponds to published version
Withholding Potentials, Absence of Ghosts and Relationship between Minimal Dilatonic Gravity and f(R) Theories
Creators: name: Fiziev, Plamen P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the relation between Minimal Dilatonic Gravity (MDG) and f(R) theories of gravity and establish strict conditions for their {\em global} equivalence. Such equivalence takes place only for a certain class of cosmological potentials, dubbed here {\em withholding potentials}, since they prevent change of the sign of dilaton $Φ$. The withholding property ensures the attractive character of gravity, as well as absence of ghosts and a tachyon in the gravi-dilaton sector and yields certain asymptotic of the admissible functions $f(R)$. Large classes of withholding cosmological potentials and functions $f(R)$ are found and described in detail. It is shown that the popular choices of $f(R)$ functions are not withholding ones. The particle content of the gravi-dilaton sector is found using perturbation theory around de Sitter vacuum of MDG. The graviton remains massless, since it obeys conformal invariant field equation in the de Sitter space-time. The $R/6$ term in the conformal invariant wave operator introduces a very small mass scale $m_{R} \approx 1.5 \times 10^{-38} m_e$, $m_e$ being the mass of the electron. The mass of the dilaton is much larger: $m\gtrapprox 10^{29} m_{R}$. Two new phenomena: scalaron waves and induction of gravitational waves by the scalaron field are discussed using the derived wave equations for scalaron and graviton. The MDG and f(R) theories are shown to predict physical deviations from GR. Seemingly, the MDG and f(R) theories, when globally equivalent, offer a unified description of dark energy and dark matter.
description: LaTeX file, 13 pages, 4 figures. Typos corrected. A slightly shortened version: the examples of f(R) models which are not equivalent to the MDG removed together with the corresponding figures (See version 2.). Some remarks removed or replaced by new ones. To appear in Physical Review D
Bayesian Weapon System Reliability Modeling with Cox-Weibull Neural Network
Creators: name: Potter, Michael
name: Cheng, Benny
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applications (stat.AP)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We propose to integrate weapon system features (such as weapon system manufacturer, deployment time and location, storage time and location, etc.) into a parameterized Cox-Weibull [1] reliability model via a neural network, like DeepSurv [2], to improve predictive maintenance. In parallel, we develop an alternative Bayesian model by parameterizing the Weibull parameters with a neural network and employing dropout methods such as Monte-Carlo (MC)-dropout for comparative purposes. Due to data collection procedures in weapon system testing we employ a novel interval-censored log-likelihood which incorporates Monte-Carlo Markov Chain (MCMC) [3] sampling of the Weibull parameters during gradient descent optimization. We compare classification metrics such as receiver operator curve (ROC) area under the curve (AUC), precision-recall (PR) AUC, and F scores to show our model generally outperforms traditional powerful models such as XGBoost and the current standard conditional Weibull probability density estimation model.
description: Pre-print with minor revisions, published at The 69th Annual Reliability and Maintainability Symposium, January 23-26, 2023, FL, USA
Systematics of the cusp anomalous dimension
Creators: name: Henn, J. M.
name: Huber, T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the velocity-dependent cusp anomalous dimension in supersymmetric Yang-Mills theory. In a paper by Correa, Maldacena, Sever, and one of the present authors, a scaling limit was identified in which the ladder diagrams are dominant and are mapped onto a Schrodinger problem. We show how to solve the latter in perturbation theory and provide an algorithm to compute the solution at any loop order. The answer is written in terms of harmonic polylogarithms. Moreover, we give evidence for two curious properties of the result. Firstly, we observe that the result can be written using a subset of harmonic polylogarithms only, at least up to six loops. Secondly, we show that in a light-like limit, only single zeta values appear in the asymptotic expansion, again up to six loops. We then extend the analysis of the scaling limit to systematically include subleading terms. This leads to a Schrodinger-type equation, but with an inhomogeneous term. We show how its solution can be computed in perturbation theory, in a way similar to the leading order case. Finally, we analyze the strong coupling limit of these subleading contributions and compare them to the string theory answer. We find agreement between the two calculations.
description: 33 pages, 4 figures. Complete LO six-loop result added. Typos corrected. Version accepted for publication
Pre-management of Disentanglement
Creators: name: Qian, Xiao-Feng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We define threshold disentanglement (TD) as the level above which entanglement must be maintained for later use and calculate the values of quantum system parameters at $t=0$ that will ensure that the threshold is not crossed in a specified time. An important issue is the possibility of non-smooth, typically non-exponential, decay of entanglement into the state of complete disentanglement (CD). Given a specified operation time $τ$, we determine phase diagrams showing entanglement preservation during the evolution of a generic two-qubit mixed state as a function of selected initial parameters such as concurrence and excitation probabilities. In other words, disentanglement can be pre-managed through these parameters. Three common relaxation processes - amplitude, phase and depolarization - are considered.
description: 14 pages
Egon Gersbach, Baubefunde der Perioden Illb-Ia der Heuneburg
Creators: name: Wieland, Günther
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2019

description: Rezension zu: Egon Gersbach, Baubefunde der Perioden Illb-Ia der Heuneburg. Mit Beiträgen von Helga van den Boom, Michael Friedrich und Sabine Hopert. Heuneburgstudien X, hrsg. von Wolfgang Kim- mig. Römisch-Germanische Forschungen 56. Verlag Philipp von Zabern, Mainz 1996. 180 Seiten mit 71 Abbildungen und 13 Tafeln, Mappe mit 4 Seiten und 24 Beilagen.
description: Fundberichte aus Baden-Württemberg, Bd. 22 Nr. 1 (1998): Fundberichte aus Baden-Württemberg
A proposal to manage social mediated YouTube risks to the reputation of the Queensland Police Service
Creators: name: Grantham, S
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 470101
subject: Communication studies

description: In light of the increasing significance of public engagement via social media platforms the Queensland Police Service (QPS) needs to examine the way it operates and deals with all media incidents and attendant risks with respect to public opinion and organisational reputation.
PBW deformations of Artin-Schelter regular algebras
Creators: name: Gaddis, Jason
Publisher: name: arXiv
Year: 2012
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We consider algebras that can be realized as PBW deformations of (Artin-Schelter) regular algebras. This is equivalent to the homogenization of the algebra being regular. It is shown that the homogenization, when it is a geometric algebra, contains a component whose points are in 1-1 correspondence with the simple modules of the deformation. We classify all PBW deformations of 2-dimensional regular algebras and give examples of 3-dimensional deformations. Other properties, such as the skew Calabi-Yau property and closure under tensor products, are considered.
description: Editing throughout. Propositions 2.5 and 3.7 corrected. Updated Section 3 on skew CY-property
Precision predictions for exotic lepton production at the Large Hadron Collider
Creators: name: Ajjath, A. H.
name: Fuks, Benjamin
name: Shao, Hua-Sheng
name: Simon, Yehudi
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate total and differential cross sections for the pair production, at the Large Hadron Collider, of exotic leptons that could emerge from models with vector-like leptons and in Type-III seesaw scenarios. Our predictions include next-to-leading-order QCD corrections, and we subsequently match them with either parton showers, or threshold resummation at the next-to-next-to-leading logarithmic accuracy. Our results show an important increase of the cross sections relative to the leading-order predictions, exhibit a distortion of the shapes for various differential distributions, and feature a significant reduction of the scale uncertainties. Our predictions have been obtained from new FeynRules model implementations and associated UFO model libraries. This completes the set of next-to-leading-order implementations of new physics models featuring extra leptons that are publicly available on the FeynRules model database.
description: 16 pages, 6 figures, 4 tables
Modelling and Simulating the Propagation of Computer Worms
Creators: name: Fan, X
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 460609
subject: Networking and communications

description: stract Active worms propagate across networks by employing various target discovery techniques. It is anticipated that a future active worm would employ multiple target discovery techniques simultaneously to greatly accelerate its propagation. Strategies that future active worms might employ to shorten the slow start phase in their propagation are studied. Their respective cost-effectiveness is assessed. This thesis also presents a study on modelling and simulating the propagation of Peerto- Peer (P2P) worms. Motivated by the aspiration to invent an easy-to-employ instrument for research on the propagation of P2P worms, I model the propagation processes of P2P worms by difference equations of logic matrix, which are essentially discrete-time deterministic propagation models of P2P worms. To the best of my knowledge, I am the first using logic matrix in network security research. The instrument’s ease of employment, which is demonstrated by its applications in our simulation experiments, makes it an attractive tool to conduct research on the propagation of P2P worms. The major contributions in this thesis are firstly, the combination of target discovery techniques that can best accelerate propagation of active worms was suggested; secondly, strategies to shorten an active worm’s slow start phase in its propagation were assessed based on a cost and benefit analysis; thirdly, I proposed a novel logic matrix approach to modelling the propagation of P2P worms; and fourthly, I found the impacts of the two different topologies on a P2P worm’s attack performance, and compared the effects of two different quarantine tactics.
A critical discourse analysis of literature pertaining to the historical "management" of the sexual and/or intimacy needs of people labelled as having a learning disability in Australia and the United Kingdom
Creators: name: Grigg, E
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 429999
subject: Other health sciences not elsewhere classified

description: The research presented here analyses and compares textual narratives generated within policy, scholarly and popular media to discern how the sexuality or intimacy needs of people categorised as ‘learning disabled’ have been historically and more recently managed in Australia and the United Kingdom. The research uses a modified critical discourse analytical approach which, in order to clarify the distinct role of power in the construction of discourses of sexuality, is mediated by the more recent ideas of progressive phronesis offered by Flyvbjerg (1998a; 2001). The analysis identifies three broad stages in the historical development of the discourses about the sexuality of learning disabled people. The first phase was prior to the 1800s, when these people were labelled non-derogatorily as ‘idiots’, and perceived as childlike, innocent and asexual. The second stage was in the 1800s when, with the emergence of scientific rationality and medicalisation, so-called idiots became medicalised and categorised as ‘feeble-minded’ or ‘moral imbeciles’. This thesis demonstrates that, during this period, an emphasis on sexual self-denial, anxieties about venereal disease and non-procreative erotic pleasure helped to inform discourses of eugenics and learning disabled people became perceived as a sexual threat to the society. This underpinned policies of sexual control through institutionalisation, gender segregation and sterilisation. The third period in the development of discourses relating to the sexuality of learning disabled people paralleled the ‘sexual revolution’ of the late- 1900s and the move towards deinstitutionalisation and human rights. This analysis shows that, although the principle of ‘sexual freedom’ was ostensibly incorporated in modern policy discourse, the sexuality of learning disabled people continues to be influenced by significant barriers of sexual intolerance, demonstrated by continuing practices of sexual segregation, sterilisation, criminal labelling and imprisonment. The analysis indicates that a discourse of sexuality, which has legitimised the control and management of learning disabled people in varying forms since the Enlightenment, continues to be encountered in policy and popular narratives. Robust sexuality awareness and education programs for carers of these people, and society in general, are necessary so that intimacy and/or sexual desires are accepted as a normal need for all human beings.
Thermodynamics in the Limit of Irreversible Reactions
Creators: name: Gorban, A. N.
name: Mirkes, E. M.
name: Yablonsky, G. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: For many real physico-chemical complex systems detailed mechanism includes both reversible and irreversible reactions. Such systems are typical in homogeneous combustion and heterogeneous catalytic oxidation. Most complex enzyme reactions include irreversible steps. The classical thermodynamics has no limit for irreversible reactions whereas the kinetic equations may have such a limit. We represent the systems with irreversible reactions as the limits of the fully reversible systems when some of the equilibrium concentrations tend to zero. The structure of the limit reaction system crucially depends on the relative rates of this tendency to zero. We study the dynamics of the limit system and describe its limit behavior as $t \to \infty$. If the reversible systems obey the principle of detailed balance then the limit system with some irreversible reactions must satisfy the {\em extended principle of detailed balance}. It is formulated and proven in the form of two conditions: (i) the reversible part satisfies the principle of detailed balance and (ii) the convex hull of the stoichiometric vectors of the irreversible reactions does not intersect the linear span of the stoichiometric vectors of the reversible reactions. These conditions imply the existence of the global Lyapunov functionals and alow an algebraic description of the limit behavior. The thermodynamic theory of the irreversible limit of reversible reactions is illustrated by the analysis of hydrogen combustion.
description: 23 pages, extended version with figs
Orbital Magnetization under an Electric Field and Orbital Magnetoelectric Polarizabilty for a Bilayer Chern System
Creators: name: Wang, Si-Si
name: Dai, Yi-Ming
name: Wang, Hui-Hui
name: Chen, Hao-Can
name: Zhang, Biao
name: Zhang, Yan-Yang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the real space formalism of orbital magnetization (OM) for a Chern insulator without an external electric field, it is correct to average the local OM either over the bulk region or over the whole sample. However for a layered Chern insulator in an external electric field, which is directly related to the nontrivial nature of orbital magnetoelectric coupling, the role of boundaries remains ambiguous in this formalism. Based on a bilayer model with an adjustable Chern number at half filling, we numerically investigate the OM with the above two different average types under a nonzero perpendicular electric field. The result shows that in this case, the nonzero Chern number gives rise to a gauge shift of the OM with the bulk region average, while this gauge shift is absent for the OM with the whole sample average. This indicates that only the whole sample average is reliable to calculate the OM under a nonzero electric field for Chern insulators. On this basis, the orbital magnetoelectric polarizablity (OMP) and the Chern-Simons orbital magnetoelectric polarizablity (CSOMP) with the whole sample average are studied. We also present the relationship between the OMP (CSOMP) and the response of Berry curvature to the electric field. The stronger the response of Berry curvature to electric field, the stronger is the OMP (CSOMP). Besides clarify the calculation methods, our result also provides an effective method to enhance OMP and CSOMP of materials.
description: 11 pages, 10 figures
Photon blockade induced by atoms with Rydberg coupling
Creators: name: Huang, Jin-Feng
name: Liao, Jie-Qiao
name: Sun, C. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the photon blockade of two-photon scattering in a one-dimensional waveguide, which contains two atoms coupled via the Rydberg interaction. We obtain the analytic scattering solution of photonic wave packets with the Laplace transform method. We examine the photon correlation by addressing the two-photon relative wave function and the second-order correlation function in the single- and two-photon resonance cases. It is found that, under the single-photon resonance condition, photon bunching and antibunching can be observed in the two-photon transmission and reflection, respectively. In particular, the bunching and antibunching effects become stronger with the increasing of the Rydberg coupling strength. In addition, we find a phenomenon of bunching-antibunching transition caused by the two-photon resonance.
description: 9 pages, 4 figures
Identifying strategies to alleviate aged-care worker burnout: A study from two aged-care facilities in Sydney
Creators: name: Andriamora, Lovasoa
Publisher: name: CQUniversity
Year: 2022
Subjects: classificationCode: 420502
subject: Aged care nursing

description: This thesis identifies strategies that will help alleviate the burnout experienced among aged-care workers in Sydney. Specifically, the study investigates the factors contributing to burnout in the human services sector with particular application to two aged-care facilities.Burnout among carers has been a major concern for many years in health care fields. Previous studies of the issue have generally focused on examining the causes of burnout and the associated consequences. However, there seems a lack of studies which suggest interventions for the alleviation of burnout. The literature in this field has identified ten factors pre-disposing carers to burnout in the aged-care industry. In this study the factors are categorised into three major groups: fixed, moderate and non-fixed factors. To gather data to achieve the research goals, a qualitative interview approach was employed. Data was elicited from twenty-five survey participants grouped as follows: ten assistant nurses, eight nurses, three facility managers and four relatives of those in care. Participants were selected from the Canterbury Domain Principal Aged Care facility and the Frank Vickery Lodge of the Wesley Mission at Sylvania. A version of the Copenhagen Burnout Inventory was adapted and used as a verification tool for interviews completed by those participating in the study. Major factors identified as influencing burnout among aged-care workers included: problems with facility staffing, the lack of ethics (or otherwise described as a breach of duty of care), and the unrealistic expectations of relatives. Recommendations arising from the study findings include: a review of training for aged-care workers, promotion of the professionalism of the aged-care profession, regulation with regard to the staff-resident ratio, and synergistic collaboration between relatives and staff. There are significant challenges to the development and maintenance of a healthy aged-care workforce in Australia. Although the data in this study is generated by small cohorts from only two sites, the strategies identified might be applied to those sites and have wider application potential for the well-being of aged-care workers in other aged-care facilities.
Different spin relaxation property observed in linearly and circularly polarized laser induced terahertz emission from Bi/Co bilayer
Creators: name: Ishibashi, Kazuaki
name: Iihama, Satoshi
name: Mizukami, Shigemi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recently, helicity-dependent photocurrent was reported in Bi single thin fi lms. It is proposed that the origin of this photocurrent is the combination of photo-spin conversion and spin-charge conversion effects in Bi and efficient spin conversion in Bi is expected. In this study, we measured two types of terahertz (THz) emissions from Bi/Co bilayer films induced by spin current generation using laser-induced demagnetization of the Co layer and photo-spin conversion effect in the Bi layer to investigate the spin current induced by the two mechanisms simultaneously. We clearly observed diff erent Bi thickness dependence of peak intensity and that of bandwidth for THz spin current in two experiments, i.e., spin current induced by demagnetization of Co and that by photo-spin conversion in Bi. The different Bi thickness dependence of spin current intensity and bandwidth in two experiments is caused by different spin relaxation properties of optically excited spin currents in Bi layers.
description: 13 pages, 11 figures
Η ελεύθερη επιλογή σχολείου στην εκπαίδευση σε ευρωπαϊκό και διεθνές επίπεδο και ο ρόλος της στην ενίσχυση της επιχειρηματικότητας και της καινοτομίας
Creators: name: Κόρκου, Γεωργία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Εκπαίδευση
subject: Ελεύθερη επιλογή σχολείου
subject: Καινοτομία
subject: Επιχειρηματικότητα

description: Η παρούσα εργασία επιχειρεί να αναδείξει τις εκπαιδευτικές πολιτικές Ελεύθερης Επιλογής Σχολείου ως μοχλούς ενίσχυσης της επιχειρηματικότητας και της καινοτομίας, μέσα από παραδείγματα ευρωπαϊκού και διεθνούς επιπέδου. Η Ελεύθερη Επιλογή Σχολείου έχει οριστεί ως κάθε πολιτική που έχει σχεδιαστεί με σκοπό την ελάττωση των περιορισμών που τίθενται στις εκπαιδευτικές μονάδες και στους μαθητές από τις τρέχουσες παραμέτρους του εκπαιδευτικού συστήματος. Εξαιτίας του έντονου αξιακού και ιδεολογικού φορτίου της, η Ελεύθερη Επιλογή Σχολείου αποτελεί ένα φλέγον ζήτημα με φανατικούς πολέμιους και υποστηρικτές τόσο μεταξύ των πολιτικών κομμάτων όσο και μεταξύ των πολιτών. Εντούτοις, το γεγονός ότι οι διάφορες πολιτικές Ελεύθερης Επιλογής Σχολείου έχουν βρει πρακτική εφαρμογή εδώ και πάρα πολλά χρόνια σε πλήθος κρατών στην Ευρώπη και διεθνώς μπορεί να αναζωογονήσει με εμπειρικά δεδομένα τον δημόσιο διάλογο σχετικά με αυτό το ζήτημα, προωθώντας μια πιο ορθολογική και μεθοδική τακτική λήψης αποφάσεων. Η ανάπτυξη της επιχειρηματικότητας και η υποστήριξη της καινοτομίας ήταν ανέκαθεν δύο από τα σημαντικότερα προσδοκώμενα οφέλη της Ελεύθερης Επιλογής Σχολείου, παράλληλα με τις υψηλότερες επιδόσεις των μαθητών, την άρση του φυλετικού και κοινωνικοοικονομικού διαχωρισμού και την ενίσχυση της εμπλοκής των γονιών στο εκπαιδευτικό σύστημα. Αυτά τα δύο εφόδια που δύναται να παρέχει ένα εκπαιδευτικό σύστημα στους μαθητές μπορούν να τους καταστήσουν ικανούς να ανταπεξέλθουν σε ένα ενδεχόμενο διογκούμενο κύμα αυτοματοποίησης της εργασίας και να αποφύγουν τη μακροχρόνια τεχνολογική ανεργία. Ως εκ τούτου, η Ελεύθερη Επιλογή Σχολείου, που μπορεί να συμβάλλει καίρια σε αυτόν τον σκοπό, φαίνεται να μπορεί επίσης να συνεισφέρει και στην οικονομική ανάπτυξη μιας περιοχής ή ενός κράτους.
Semiclassical polaron dynamics of impurities in ultracold gases
Creators: name: Dasenbrook, David
name: Komnik, Andreas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a semiclassical treatment of a fermionic impurity coupled to Bogolyubov modes of a BEC. In the lowest order approximation we find a full solution of an initial value problem, which turns out to behave differently in the sub- and supersonic regimes. While in the former case no impurity deceleration is observed, in the latter case non-Markovian dissipation effects kick in resulting in slowing down of the fermion. Although this scenario is compatible with the one offered by an elementary field theoretical picture at weak coupling, the details of the dynamics turn out to be completely different. Fluctuation effects can be taken into account by expansion around the classical path. This allows for estimation of the all-important polaron radius as a function of fermion-boson coupling strength. As an application we calculate the drag force which is exerted by the BEC on the impurity moving with constant velocity $v$. Contrary to the perturbative result, according to which the drag force is $\sim v^4$, it turns out to be proportional to $1/v^2$ in the semiclassical regime.
description: 4 pages, 3 figures
Limiting fragmentation in heavy-ion stopping?
Creators: name: Hoelck, Johannes
name: Hiyama, Emiko
name: Wolschin, Georg
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Based on a nonequilibrium-statistical relativistic diffusion model that is consistent with quantum chromodynamics (QCD), we investigate baryon stopping in relativistic heavy-ion collisions at SPS, RHIC, and LHC energies. The net-proton rapidity distributions of the individual fragments exhibit a scaling behaviour similar to limiting fragmentation (LF) that is related to geometric scaling in the colour-glass condensate (CGC) and depends upon the gluon saturation scale. Forward-angle net-proton data at energies reached at the LHC are required to verify the prediction.
description: 6 pages, 5 figures; minor misprint in Fig. 5 corrected (upper filled square)
A lattice gas of prime numbers and the Riemann Hypothesis
Creators: name: Vericat, Fernando
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In recent years, there has been some interest in applying ideas and methods taken from Physics in order to approach several challenging mathematical problems, particularly the Riemann Hypothesis. Most of these kind of contributions are suggested by some quantum statistical physics problems or by questions originated in chaos theory. In this letter we show that the real part of the non-trivial zeros of the Riemann zeta function extremizes the grand potential corresponding to a simple model of one-dimensional classical lattice gas, the critical point being located at 1/2 as the Riemann Hypothesis claims.
description: 12 pages
Informing natural resource management policy through cost-benefit analysis
Creators: name: Star, M
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 370509
subject: Sedimentology
classificationCode: 380105
subject: Environment and resource economics
classificationCode: 380101
subject: Agricultural economics

description: A key challenge in improving water quality entering into the Great Barrier Reef (GBR) from rangelands grazing is to understand the economic trade-offs in changing management practices and subsequent sediment reductions. In grazing lands in the Fitzroy and Burdekin catchments this can be achieved by improving land condition and reducing stocking rates to improve ground cover. A key conceptual problem facing policymakers is a lack of quantitative models and procedures to assess the costs and benefits of changing practices and to improve policy and program mechanisms. A cost–benefit framework provides an appropriate methodology to estimate the trade-offs to achieving targeted reductions in sediments. To complete the framework the costs were estimated using a bioeconomic modelling approach and the community benefits of achieving sediment reductions were estimated through a choice modelling approach. The methodology integrated current policies and plans to consider the approaches in a policy framework. The results bring together both the bioeconomic modelling and choice modelling, demonstrating that the community benefit for improved GBR health is significantly higher than the current level of government investment. The large heterogeneity in costs creates challenges in the complexity of administering efficient policy mechanisms but allows for clear prioritisation and targeting in the landscape.
Wages and productivity growth in a dynamic oligopoly
Creators: name: Bester, Helmut
name: Milliou, Chrysovalantou
name: Petrakis, Emmanuel
Publisher: name: Freie Universität Berlin
Year: 2009
Subjects: subject: innovation
subject: labor productivity
subject: oligopoly
subject: wage differentials
subject: productivity growth
subject: industry dynamics
subject: 300 Sozialwissenschaften::330 Wirtschaft::338 Produktion

description: This paper studies the innovation dynamics of an oligopolistic in- dustry. The firms compete not only in the output market but also by engaging in productivity enhancing innovations to reduce labor costs. Rent sharing may generate productivity dependent wage differentials. Productivity growth creates intertemporal spill–over effects, which af- fect the incentives for innovation at subsequent dates. Over time the industry equilibrium approaches a steady state. The paper character- izes the evolution of the industry’s innovation behavior and its market structure on the adjustment path.
New solar twins and the metallicity and temperature scales of the Geneva Copenhagen Survey
Creators: name: Datson, Juliet
name: Flynn, Chris
name: Portinari, Laura
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We search for "solar twins" in the Geneva-Copenhagen Survey (GCS) using high resolution optical spectroscopy. We initially select Sun-like stars from the GCS by absolute magnitude, b-y colour and metallicity close to the solar values. Our aim is to find the stars which are spectroscopically very close to the Sun using line depth ratios and the median equivalent widths and depths of selected lines with a range of excitation potentials. We present the ten best stars fulfilling combined photometric and spectroscopic criteria, of which six are new twins. We use our full sample of Sun-like stars to examine the calibration of the metallicity and temperature scale in the GCS. Our results give rise to the conclusion that the GCS may be offset from the solar temperature and metallicity for sun-like stars by 100K and 0.1dex, respectively.
description: 14 pages, 15 figures and 7 tables. Published version
title: Steuerkomplexität und Arbeitsangebot
title: eine experimentelle Analyse
titleType: Subtitle
Creators: name: Sielaff, Christian
Publisher: name: Freie Universität Berlin
Year: 2011
Subjects: subject: Steuerkomplexität
subject: Arbeits-Freizeit-Entscheidung
subject: Experimentelle Steuerforschung
subject: Real-Effort-Experiment
subject: Behavioral Taxation
subject: 300 Sozialwissenschaften::330 Wirtschaft::336 Öffentliche Finanzen

description: Die vorliegende Arbeit untersucht den Einfluss von komplexen Steuertarifsystemen auf die Arbeits-Freizeit-Entscheidung von Individuen. Dazu wird ein wirtschaftswissenschaftliches Experiment mit 96 studentischen Teilnehmern durchgeführt. Es wird eine realitätsnahe Arbeits-Freizeit- Entscheidung unter Setzung tatsächlicher monetärer Anreize modelliert, um so den Einfluss verschieden komplexer Steuertarifsysteme auf das individuelle Arbeitsangebot der Experimentteilnehmer abzuleiten. Die Modellierung der verschiedenen Komplexitätsstufen erfolgt dabei durch das Zusammenspiel mehrerer Steuersätze, wie es auch in der Besteuerungspraxis zu finden ist. Es kann gezeigt werden, dass bei konstantem Netto- und Bruttolohn das Arbeitsangebot der Teilnehmer allein durch eine Steigerung des Komplexitätsgrades des Steuertarifsystems signifikant sinkt. Die Fragestellung ist sowohl für die theoretische Forschung als auch für zukünftige Steuerreformdebatten mit dem Ziel der Steuervereinfachung von Interesse.
Forward electromagnetic induction modelling in a multilayered half-space: An open-source software tool
Creators: name: Deidda, Gian Piero
name: de Alba, Patricia Díaz
name: Pes, Federica
name: Rodriguez, Giuseppe
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Electromagnetic induction (EMI) techniques are widely used in geophysical surveying. Their success is mainly due to their easy and fast data acquisition, but the effectiveness of data inversion is strongly influenced by the quality of sensed data, resulting from suiting the device configuration to the physical features of the survey site. Forward modelling is an essential tool to optimize this aspect and design a successful surveying campaign. In this paper, a new software tool for forward EMI modelling is introduced. It extends and complements an existing open-source package for EMI data inversion, and includes an interactive graphical user interface. Its use is explained by a theoretical introduction and demonstrated through a simulated case study. The nonlinear data inversion issue is briefly discussed and the inversion module of the package is extended by a new regularized minimal-norm algorithm.
Threshold current for switching of a perpendicular magnetic layer induced by spin Hall effect
Creators: name: Lee, Ki-Seung
name: Lee, Seo-Won
name: Min, Byoung-Chul
name: Lee, Kyung-Jin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We theoretically investigate the switching of a perpendicular magnetic layer by in-plane charge current due to the spin Hall effect. We find that, in the high damping regime, the threshold switching current is independent of the damping constant, and is almost linearly proportional to both effective perpendicular magnetic anisotropy field and external in-plane field applied along the current direction. We obtain an analytic expression of the threshold current, in excellent agreement with numerical results. This expression can be used to determine the physical quantities associated with spin Hall effect, and to design relevant magnetic devices based on the switching of perpendicular magnetic layers.
description: 16 pages, 3 figures
Inter security : botnet detection on a campus network using a historical perspective
Creators: name: Kennedy, M
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 460609
subject: Networking and communications

description: This research aims to improve internet security. Specifically it aims to improve enterprise defences against botnets. A botnet is a collection of computer resources that can be remotely instructed to perform actions, often without the host computer user’s knowledge or consent. These controlled computers are known as bots. Botnets are considered to be a major security threat on the internet. Botnets have been used to probe every internet address collecting terabytes of data while apparently remaining undetected. Botnets are a major source of spams and are a major threat to the internet banking industry. Botnets can be used to exhaust the resources of targeted computing systems making those systems unavailable to legitimate users. Botnets can also be used in targeted attacks with the aim of collecting secrets. Botnets can use a number of techniques including per instance mutation, selective infection, encryption, rootkits and sophisticated architecture to avoid detection. Up-to-date antivirus software provides limited protection. Many detection techniques require signatures generated from samples collected by some other method such as honeypots. Bots may be programmed to remove all traces of their activity once their task is completed. My objective was to determine if undetected botnets exist on a well-managed university network. I was dubious at the reports produced by the computer security industry. However, it is completely plausible that botnets can exist on a well-managed computer network. So the problem is how to find botnets that have evaded real time detection and are unknown to the anti-malware systems in place? My idea was to collect historical data and examine it at a later date, thus giving the unknown botnets a chance to become known. Studying historical network activity can be useful in determining the extent of botnet activity. I collected over one terabyte of data consisting of a one month trace of internet traffic from one campus subnet. I used a number of different botnet detection techniques to examine the data and discovered limit botnet activity on the network. The most successful feature used to identify botnet activity was the destination address using blacklists. I found using IP addresses alone to identify hosts was not reliable. I suggest monitoring for abnormal DNS traffic may be a useful early warning indicator. Monitoring DHCP abnormalities may point to high risk systems. There is no effective way of detecting all botnet activity. It is far easier to devise evasion techniques than it is to implement detection methods. Improving virus detection would also be very useful. This work was conducted completely independently from the network administrators.
Behavior under magnetic field of resonance at the edge of the upper Hubbard band in 1T-TaS2
Creators: name: Butler, C. J.
name: Yoshida, M.
name: Hanaguri, T.
name: Iwasa, Y.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent theoretical investigations of quantum spin liquids have described phenomenology amenable to experimental observation using scanning tunneling microscopy. This includes characteristic resonances found at the edge of the upper Hubbard band of the host Mott insulator, that under certain conditions shift into the Mott gap under external magnetic field [W.-Y. He and P. A. Lee, arXiv:2212.08767]. In light of this we report scanning tunneling microscopy observations, in samples of the quantum spin liquid candidate 1T-TaS2, of a conductance peak at the upper Hubbard band edge and its magnetic field dependent behavior. These observations potentially represent evidence for the existence of a quantum spin liquid in 1T TaS2. We also observe samples in which such field dependence is absent, but with no observed correlate for the presence or absence of field dependence. This suggests one or more material properties controlling electronic behavior that are yet to be understood, and should help to motivate renewed investigation of the microscopic degrees of freedom in play in 1T-TaS2, as well as the possible realization of a quantum spin liquid phase.
description: 5 pages, 2 figures
title: Distributional effects of the European Emissions Trading System and the role of revenue recycling
title: empirical evidence from combined industry- and household-level data
titleType: Subtitle
Creators: name: Cludius, Johanna
name: Beznoska, Martin
name: Steiner, Viktor
Publisher: name: Freie Universität Berlin
Year: 2012
Subjects: subject: 300 Sozialwissenschaften::330 Wirtschaft::337 Weltwirtschaft

description: We calculate the expected distributional effects of the European Emissions Trading System combining industry and household-level data. By combining data on direct CO2 emissions by production sector from the German Environmental Account with the German Input-Output Accounts, we calculate the CO2 intensity of each sector covered by the EU ETS. We focus on the impact of price increases in the electricity sector, both directly in the form of higher electricity bills for consumers and indirectly through products that use electricity as an input to production. Distributional effects of price increases are analyzed on the basis of the German Income and Expenditure Survey for the year 2008 data and updated to 2013. We confirm the ex-ante expected regressive effect, which is, however, both rather small in magnitude and can be offset and even more than offset by revenue recycling, in particular the reduction of social security contributions on labour income.
Hawking radiation inside a charged black hole
Creators: name: McMaken, Tyler
name: Hamilton, Andrew J. S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Here we analyze the Hawking radiation detected by an inertial observer in an arbitrary position in a Reissner-Nordström spacetime, with special emphasis on the asymptotic behavior of the Hawking spectrum as an observer approaches the inner or outer horizon. Two different methods are used to analyze the Hawking flux: first, we calculate an effective temperature quantifying the rate of exponential redshift experienced by an observer from an emitter's vacuum modes, which reproduces the Hawking effect provided the redshift is sufficiently adiabatic. Second, we compute the full Bogoliubov graybody spectrum observed in the three regimes where the wave equation can be solved analytically (at infinity and at the outer and inner horizons). We find that for an observer at the event horizon, the effective Hawking temperature is finite and becomes negative when $(Q/M)^2>8/9$, while at the inner horizon, the effective temperature is always negative and infinite in every direction the observer looks, coinciding with an ultraviolet-divergent spectrum.
description: 26 pages, 8 figures, 1 appendix
cphVB: A System for Automated Runtime Optimization and Parallelization of Vectorized Applications
Creators: name: Kristensen, Mads Ruben Burgdorff
name: Lund, Simon Andreas Frimann
name: Blum, Troels
name: Vinter, Brian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Programming Languages (cs.PL)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Modern processor architectures, in addition to having still more cores, also require still more consideration to memory-layout in order to run at full capacity. The usefulness of most languages is deprecating as their abstractions, structures or objects are hard to map onto modern processor architectures efficiently. The work in this paper introduces a new abstract machine framework, cphVB, that enables vector oriented high-level programming languages to map onto a broad range of architectures efficiently. The idea is to close the gap between high-level languages and hardware optimized low-level implementations. By translating high-level vector operations into an intermediate vector bytecode, cphVB enables specialized vector engines to efficiently execute the vector operations. The primary success parameters are to maintain a complete abstraction from low-level details and to provide efficient code execution across different, modern, processors. We evaluate the presented design through a setup that targets multi-core CPU architectures. We evaluate the performance of the implementation using Python implementations of well-known algorithms: a jacobi solver, a kNN search, a shallow water simulation and a synthetic stencil simulation. All demonstrate good performance.
Triplets of pure free squarefree complexes
Creators: name: Floystad, Gunnar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13D02

description: On the category of bounded complexes of finitely generated free squarefree modules over the polynomial ring S, there is the standard duality functor D = Hom_S(-, omega_S) and the Alexander duality functor A. The composition AD is an endofunctor on this category, of order three up to translation. We consider complexes F of free squarefree modules such that both F, AD(F) and (AD)^2(F) are pure, when considered as singly graded complexes. We conjecture i) the existence of such triplets of complexes for given triplets of degree sequences, and ii) the uniqueness of their Betti numbers, up to scalar multiple. We show that this uniqueness follows from the existence, and we construct such triplets if two of them are linear.
description: 25 pages, minor improvements
title: The effect of saving subsidies on household saving
title: evidence from Germany
titleType: Subtitle
Creators: name: Corneo, Giacomo
name: Keese, Matthias
name: Schröder, Carsten
Publisher: name: Freie Universität Berlin
Year: 2010
Subjects: subject: Household saving
subject: Saving incentives
subject: Retirement
subject: Riester scheme
subject: Coarsened exact matching
subject: 300 Sozialwissenschaften::330 Wirtschaft::336 Öffentliche Finanzen

description: Since 2002 the German government seeks to stimulate private retirement savings by means of special allowances and tax exemptions – the so-called Riester scheme. We apply matching and panel regression techniques to assess the impact of the Riester scheme on households’ propensities to save in a natural experiment framework. Estimation results from both the German Socio-Economic Panel and the SAVE study indicate that private saving was hardly affected by the introduction of the Riester scheme.