cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Analysis of Online Toxicity Detection Using Machine Learning Approaches
Creators: name: Anjum
name: Katarya, Rahul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Computers and Society (cs.CY)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Social media and the internet have become an integral part of how people spread and consume information. Over a period of time, social media evolved dramatically, and almost half of the population is using social media to express their views and opinions. Online hate speech is one of the drawbacks of social media nowadays, which needs to be controlled. In this paper, we will understand how hate speech originated and what are the consequences of it; Trends of machine-learning algorithms to solve an online hate speech problem. This study contributes by providing a systematic approach to help researchers to identify a new research direction and elucidating the shortcomings of the studies and model, as well as providing future directions to advance the field.
description: 10 pages
A Novel Phase Shift Acquired due to Virtual Forces
Creators: name: Kaufherr, T.
name: Aharonov, Y.
name: Nussinov, S.
name: Popescu, S.
name: Tollaksen, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper has been withdrawn by the author.
description: This paper has been withdrawn by the author. 11 pages, 4 figures
Comparative Analysis of Machine Learning and Deep Learning Algorithms for Detection of Online Hate Speech
Creators: name: Dhamija, Tashvik
name: Anjum
name: Katarya, Rahul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: In the day and age of social media, users have become prone to online hate speech. Several attempts have been made to classify hate speech using machine learning but the state-of-the-art models are not robust enough for practical applications. This is attributed to the use of primitive NLP feature engineering techniques. In this paper, we explored various feature engineering techniques ranging from different embeddings to conventional NLP algorithms. We also experimented with combinations of different features. From our experimentation, we realized that roBERTa (robustly optimized BERT approach) based sentence embeddings classified using decision trees gives the best results of 0.9998 F1 score. In our paper, we concluded that BERT based embeddings give the most useful features for this problem and have the capacity to be made into a practical robust model.
description: 10 pages
Digital simulation of a crushing plant
Creators: name: Hatch, Christopher
Publisher: name: University of British Columbia
Year: 2010

description: To improve upon the understanding and efficiency of the crushing/ i screening process, the Brenda Mines Limited secondary crushing plant was simulated. The plant consists of two stages of crushing, with a single stage of screening employed in closed circuit with the latter crushing stage. Acquisition of plant data was carried out according to full or modified factorial designs intended to cover normal operating ranges. The units sampled include a Symons Nordberg 7 - foot standard cone crusher, a Symons Nordberg 7 - foot short-head cone crusher and two Allis-Chalmers 8ft.x20ft. double deck virbrating screens. Sampling was carried out under conditions as close to steady state as was possible. All samples were screened at the plant using a standarized procedure. Raw data obtained around the screens was later adjusted by means of a least squares technique that assumes all measured values are in error. The models developed to describe both crushing operations are modifications of those used at Mt. Isa Mines Limited. The model parameters were empirically fitted to the observed data. Both models gave satisfactory performance. The model proposed for the vibrating screens was derived from small particle statistics. It is continuous over all size ranges and was judged to perform satisfactorily. Models for the short-head crushers and the screens can be extrapolated approximately twenty percent beyond their fitted data ranges. The fitted models were combined to enable a steady-state simulation of the complete secondary crushing plant. A study of the simulation was performed in accordance with a full factorial design modified to include intermediate ranges. Operating variables whose values were generated during the simulation remained within their fitted ranges, with the exception of the short-head crusher feedrate. Preliminary analysis of the simulation output shows that the results conform to expected and observed plant behavior. Further analysis with respect to short-head crusher power draw indicates that it may be possible to increase plant capacity under some conditions. The economic advantage of a digital simulation is demonstrated by the fact that the average cost for one computer run is approximately twenty cents.
Transport coefficients, membrane couplings and universality at extremality
Creators: name: Paulos, Miguel F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an efficient method for computing the zero frequency limit of transport coefficients in strongly coupled field theories described holographically by higher derivative gravity theories. Hydrodynamic parameters such as shear viscosity and conductivity can be obtained by computing residues of poles of the off-shell lagrangian density. We clarify in which sense these coefficients can be thought of as effective couplings at the horizon, and present analytic, Wald-like formulae for the shear viscosity and conductivity in a large class of general higher derivative lagrangians. We show how to apply our methods to systems at zero temperature but finite chemical potential. Our results imply that such theories satisfy $η/s=1/4π$ universally in the Einstein-Maxwell sector. Likewise, the zero frequency limit of the real part of the conductivity for such systems is shown to be universally zero, and we conjecture that higher derivative corrections in this sector do not modify this result to all orders in perturbation theory.
description: 29 pages, v2: Small text changes for clarity, typos corrected
Compact-like vortices in isotropic curved spacetime
Creators: name: Lima, F. C. E.
name: Almeida, C. A. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduced a generalized Maxwell-Higgs model in a $(3+1)$ isotropic spacetime, and we found their stationary solutions using the BPS approach in curved spacetime. In order to investigate the compact-like vortices, we assume a particular choice for the generalization term. The model is controlled by a potential driven by a single real parameter that can be used to change the vortex solutions profile as they approach their bound values. Resembling some flat spacetime vortex solutions, our model tends to compress the vortices when the parameter $l$ increases. Through numerical analysis, we also show the energy behavior and the magnetic field of the model.
description: 17 pages, 5 figures. To appear in Annals of Physics
Koncern-esdh
Creators: Transport- og Energiministeriet
Trafikstyrelsen
Havarikommissionen for Civil Luftfart og Jernbane
Kommisarius for Jylland
Kommissarius for Øerne
Kommissarius for Øerne
Jernbanenævnet
Publisher: name: Rigsarkivet
Year: 2022

description: Journalisering af sager med dokumenter
Letter from Kathleen Raine to Robin Skelton, [between 1950 and 1959], [01]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: English poetry--Manuscripts
valueUri: http://id.worldcat.org/fast/912320
subject: Periodicals--Publishing
valueUri: http://id.worldcat.org/fast/1058100
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Philosophy
valueUri: http://id.worldcat.org/fast/1060777
subject: FOS: Philosophy, ethics and religion
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Book industries and trade
valueUri: http://id.worldcat.org/fast/836171
subject: Neoplatonism
valueUri: http://id.worldcat.org/fast/1035884
subject: Platonists
valueUri: http://id.worldcat.org/fast/1066881
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718

description: Part of a collection of correspondence from Kathleen Raine to Robin Skelton. Skelton was a British poet, academic, anthologist, and practicing Wiccan. He taught at Manchester University before emigrating to Canada in 1963, where he taught creative writing at the University of Victoria and started the literary magazine The Malahat Review. Also included are some letters to Skelton’s wife Sylvia, and his daughters. Spanning close to forty-five years, the correspondence discusses poetry, writing, and philosophy; particularly Platonism and Neoplatonism. Raine often refers to the writings of William Blake and W. B. Yeats. Many letters also mention contemporary literary figures at the time including: Herbert Read, Peter Russell, Liam Miller, and Thurairajah Tambimuttu. In this letter, Raine explains that her mother has recently had a stroke, and thanks Skelton for sending the syllabus from a creative writing school.
The Current Status of Binary Black Hole Simulations in Numerical Relativity
Creators: name: Hinder, Ian
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Since the breakthroughs in 2005 which have led to long term stable solutions of the binary black hole problem in numerical relativity, much progress has been made. I present here a short summary of the state of the field, including the capabilities of numerical relativity codes, recent physical results obtained from simulations, and improvements to the methods used to evolve and analyse binary black hole spacetimes.
description: 14 pages; minor changes and corrections in response to referees
Automated News Summarization Using Transformers
Creators: name: Gupta, Anushka
name: Chugh, Diksha
name: Anjum
name: Katarya, Rahul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: The amount of text data available online is increasing at a very fast pace hence text summarization has become essential. Most of the modern recommender and text classification systems require going through a huge amount of data. Manually generating precise and fluent summaries of lengthy articles is a very tiresome and time-consuming task. Hence generating automated summaries for the data and using it to train machine learning models will make these models space and time-efficient. Extractive summarization and abstractive summarization are two separate methods of generating summaries. The extractive technique identifies the relevant sentences from the original document and extracts only those from the text. Whereas in abstractive summarization techniques, the summary is generated after interpreting the original text, hence making it more complicated. In this paper, we will be presenting a comprehensive comparison of a few transformer architecture based pre-trained models for text summarization. For analysis and comparison, we have used the BBC news dataset that contains text data that can be used for summarization and human generated summaries for evaluating and comparing the summaries generated by machine learning models.
description: 10 pages
Patent Strategies and R&D in Complex Product Industries
Creators: name: Bayramli, Meltem <1982>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2013
Subjects: SECS-P/06 Economia applicata

description: The study aims at providing a framework conceptualizing patenting activities under the condition of intellectual property rights fragmentation. Such a framework has to deal with the interrelated problems of technological complexity in the modern patent landscape. In that respect, ex-post licensing agreements have been incorporated into the analysis. More precisely, by consolidating the right to use patents required for commercialization of a product, private market solutions, such as cross-licensing agreements and patent pools help firms to overcome problems triggered by the intellectual property rights fragmentation. Thereby, private bargaining between parties as such cannot be isolated from the legal framework. A result of this analysis is that policies ignoring market solutions and only focusing on static gains can mitigate the dynamic efficiency gains as induced by the patent system. The evidence found in this thesis supports the opinion that legal reforms that aim to decrease the degree of patent protection or to lift it all together can hamper the functioning of the current system.
Additional file 5 of The LINC00922 aggravates ovarian cancer progression via sponging miR-361-3p
Creators: name: Wang, Liping
name: Ren, Chenchen
name: Xu, Yajuan
name: Yang, Li
name: Chen, Yannan
name: Zhu, Yuanhang
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Additional file 5: Fig. S5. The protein expression of CLDN1 were detected by western blotting in ES-2 and SKOV-3 cells transfected with either miR-361-3p mimics or miR-361-3p inhibitor. miR mim., miR-361-3p mimics. NC mim., corresponding negative control of miR-361-3p mimics. miR inh., miR-361-3p inhibitor. NC inh., corresponding negative control of miR-361-3p inhibitor. **P < 0.01, ***P < 0.001.
Multi-Wavelength Observation Campaign of the TeV Gamma-Ray Binary HESS J0632+057 with NuSTAR, VERITAS, MDM, and Swift
Creators: name: Tokayer, Y. M.
name: An, H.
name: Halpern, J. P.
name: Kim, J.
name: Mori, K.
name: Hailey, C. J.
name: Adams, C. B.
name: Benbow, W.
name: Brill, A.
name: Buckley, J. H.
name: Capasso, M.
name: Errando, M.
name: Falcone, A.
name: Farrell, K. A
name: Foote, G. M
name: Fortson, L.
name: Furniss, A.
name: Gent, A.
name: Giuri, C.
name: Hanna, D.
name: Hassan, T.
name: Hervet, O.
name: Holder, J.
name: Hona, B.
name: Humensky, T. B.
name: Jin, W.
name: Kaaret, P.
name: Kertzman, M.
name: Kieda, D.
name: Lang, M. J.
name: Maier, G.
name: McGrath, C. E
name: Moriarty, P.
name: Mukherjee, R.
name: Nievas-Rosillo, M.
name: O'Brien, S.
name: Ong, R. A.
name: Otte, A. N.
name: Park, N.
name: Patel, S.
name: Pfrang, K.
name: Pohl, M.
name: Prado, R. R.
name: Pueschel, E.
name: Quinn, J.
name: Ragan, K.
name: Reynolds, P. T.
name: Ribeiro, D.
name: Roache, E.
name: Ryan, J. L.
name: Santander, M.
name: Schlenstedt, S.
name: Sembroski, G. H.
name: Weinstein, A.
name: Williams, D. A.
name: Williamson, T. J
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: HESS J0632+057 belongs to a rare subclass of binary systems which emits gamma-rays above 100 GeV. It stands out for its distinctive high-energy light curve, which features a sharp ``primary'' peak and broader ``secondary'' peak. We present the results of contemporaneous observations by NuSTAR and VERITAS during the secondary peak between Dec. 2019 and Feb. 2020, when the orbital phase ($ϕ$) is between 0.55 and 0.75. NuSTAR detected X-ray spectral evolution, while VERITAS detected TeV emission. We fit a leptonic wind-collision model to the multi-wavelength spectra data obtained over the four NuSTAR and VERITAS observations, constraining the pulsar spin-down luminosity and the magnetization parameter at the shock. Despite long-term monitoring of the source from Oct. 2019 to Mar. 2020, the MDM observatory did not detect significant variation in H$α$ and H$β$ line equivalent widths, an expected signature of Be-disk interaction with the pulsar. Furthermore, fitting folded Swift-XRT light curve data with an intra-binary shock model constrained the orbital parameters, suggesting two orbital phases (at $ϕ_D = 0.13$ and 0.37) where the pulsar crosses the Be-disk, as well as phases for the periastron ($ϕ_0 = 0.30$) and inferior conjunction ($ϕ_{\text{IFC}} = 0.75$). The broad-band X-ray spectra with Swift-XRT and NuSTAR allowed us to measure a higher neutral hydrogen column density at one of the predicted disk-passing phases.
description: 21 pages, 9 figures, accepted to ApJ
Near-threshold boson pair production in the model of smeared-mass unstable particles
Creators: name: Kuksa, V. I.
name: Pasechnik, R. S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Near-threshold production of boson pairs is considered within the framework of the model of unstable particles with smeared mass. We describe the principal aspects of the model and consider the strategy of calculations including the radiative corrections. The results of calculations are in good agreement with LEP II data and Monte-Carlo simulations. Suggested approach significantly simplifies calculations with respect to the standard perturbative one.
description: 15 pages, 6 figures, minor corrections, references added
Measuring the local dark matter density
Creators: name: Garbari, Silvia
name: Lake, George
name: Read, Justin I.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We examine systematic problems in determining the local matter density from the vertical motion of stars, i.e. the 'Oort limit'. Using collisionless simulations and a Monte Carlo Markov Chain technique, we determine the data quality required to detect local dark matter at its expected density. We find that systematic errors are more important than observational errors and apply our technique to Hipparcos data to reassign realistic error bars to the local dark matter density.
description: 3 pages, 1 figure, to be published in "Hunting for the Dark: The Hidden Side of Galaxy Formation", Malta, 19-23 Oct. 2009, eds. V.P. Debattista & C.C. Popescu, AIP Conf. Ser
Bayesian Model-Averaged Meta-Analysis in Medicine
Creators: name: Bartoš, František
name: Gronau, Quentin F.
name: Timmers, Bram
name: Otte, Willem M.
name: Ly, Alexander
name: Wagenmakers, Eric-Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: G.3
subject: 62F15

description: We outline a Bayesian model-averaged meta-analysis for standardized mean differences in order to quantify evidence for both treatment effectiveness $δ$ and across-study heterogeneity $τ$. We construct four competing models by orthogonally combining two present-absent assumptions, one for the treatment effect and one for across-study heterogeneity. To inform the choice of prior distributions for the model parameters, we used 50% of the Cochrane Database of Systematic Reviews to specify rival prior distributions for $δ$ and $τ$. The relative predictive performance of the competing models and rival prior distributions was assessed using the remaining 50\% of the Cochrane Database. On average, $\mathcal{H}_1^r$ -- the model that assumes the presence of a treatment effect as well as across-study heterogeneity -- outpredicted the other models, but not by a large margin. Within $\mathcal{H}_1^r$, predictive adequacy was relatively constant across the rival prior distributions. We propose specific empirical prior distributions, both for the field in general and for each of 46 specific medical subdisciplines. An example from oral health demonstrates how the proposed prior distributions can be used to conduct a Bayesian model-averaged meta-analysis in the open-source software R and JASP. The preregistered analysis plan is available at https://osf.io/zs3df/.
Core-Collapse Astrophysics with a Five-Megaton Neutrino Detector
Creators: name: Kistler, Matthew D.
name: Yuksel, Hasan
name: Ando, Shin'ichiro
name: Beacom, John F.
name: Suzuki, Yoichiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The legacy of solar neutrinos suggests that large neutrino detectors should be sited underground. However, to instead go underwater bypasses the need to move mountains, allowing much larger water Cherenkov detectors. We show that reaching a detector mass scale of ~5 Megatons, the size of the proposed Deep-TITAND, would permit observations of neutrino "mini-bursts" from supernovae in nearby galaxies on a roughly yearly basis, and we develop the immediate qualitative and quantitative consequences. Importantly, these mini-bursts would be detected over backgrounds without the need for optical evidence of the supernova, guaranteeing the beginning of time-domain MeV neutrino astronomy. The ability to identify, to the second, every core collapse in the local Universe would allow a continuous "death watch" of all stars within ~5 Mpc, making practical many previously-impossible tasks in probing rare outcomes and refining coordination of multi-wavelength/multi-particle observations and analysis. These include the abilities to promptly detect otherwise-invisible prompt black hole formation, provide advance warning for supernova shock-breakout searches, define tight time windows for gravitational-wave searches, and identify "supernova impostors" by the non-detection of neutrinos. Observations of many supernovae, even with low numbers of detected neutrinos, will help answer questions about supernovae that cannot be resolved with a single high-statistics event in the Milky Way.
description: 10 pages, 5 figures; updated to match published version
Lægemiddeloplysningssystem
Creators: Lægemiddelstyrelsen
Publisher: name: Rigsarkivet
Year: 2022

description: LOS-systemet er Lægemiddelstyrelsens centrale system til stamdata ang. lægemidler. LOS indeholder en fortegnelse over ansøgte og godkendte lægemidler i Danmark, i forhold til Lægemiddellovens § 38 samt oplysninger om lægemidler, lægemiddelvirksomheder og kliniske forsøg.
Time-based Dynamic Controllability of Disjunctive Temporal Networks with Uncertainty: A Tree Search Approach with Graph Neural Network Guidance
Creators: name: Osanlou, Kevin
name: Frank, Jeremy
name: Benton, J.
name: Bursuc, Andrei
name: Guettier, Christophe
name: Jacopin, Eric
name: Cazenave, Tristan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Scheduling in the presence of uncertainty is an area of interest in artificial intelligence due to the large number of applications. We study the problem of dynamic controllability (DC) of disjunctive temporal networks with uncertainty (DTNU), which seeks a strategy to satisfy all constraints in response to uncontrollable action durations. We introduce a more restricted, stronger form of controllability than DC for DTNUs, time-based dynamic controllability (TDC), and present a tree search approach to determine whether or not a DTNU is TDC. Moreover, we leverage the learning capability of a message passing neural network (MPNN) as a heuristic for tree search guidance. Finally, we conduct experiments for which the tree search shows superior results to state-of-the-art timed-game automata (TGA) based approaches. We observe that using an MPNN for tree search guidance leads to a significant increase in solving performance and scalability to harder DTNU problems.
Eigenvalue method to compute the largest relaxation time of disordered systems
Creators: name: Monthus, Cecile
name: Garel, Thomas
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We consider the dynamics of finite-size disordered systems as defined by a master equation satisfying detailed balance. The master equation can be mapped onto a Schrödinger equation in configuration space, where the quantum Hamiltonian $H$ has the generic form of an Anderson localization tight-binding model. The largest relaxation time $t_{eq}$ governing the convergence towards Boltzmann equilibrium is determined by the lowest non-vanishing eigenvalue $E_1=1/t_{eq}$ of $H$ (the lowest eigenvalue being $E_0=0$). So the relaxation time $t_{eq}$ can be computed {\it without simulating the dynamics} by any eigenvalue method able to compute the first excited energy $E_1$. Here we use the 'conjugate gradient' method to determine $E_1$ in each disordered sample and present numerical results on the statistics of the relaxation time $t_{eq}$ over the disordered samples of a given size for two models : (i) for the random walk in a self-affine potential of Hurst exponent $H$ on a two-dimensional square of size $L \times L$, we find the activated scaling $\ln t_{eq}(L) \sim L^ψ$ with $ψ=H$ as expected; (ii) for the dynamics of the Sherrington-Kirkpatrick spin-glass model of $N$ spins, we find the growth $\ln t_{eq}(N) \sim N^ψ$ with $ψ=1/3$ in agreement with most previous Monte-Carlo measures. In addition, we find that the rescaled distribution of $(\ln t_{eq})$ decays as $e^{- u^η}$ for large $u$ with a tail exponent of order $η\simeq 1.36$. We give a rare-event interpretation of this value, that points towards a sample-to-sample fluctuation exponent of order $ψ_{width} \simeq 0.26$ for the barrier.
description: 10 pages, 4 figures ; in v2, new rare-event interpretation of the tail exponent $\eta$ in relation with the sample-to-sample fluctuation exponent
Class invariants by the CRT method
Creators: name: Enge, Andreas
name: Sutherland, Andrew V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11Y16

description: We adapt the CRT approach for computing Hilbert class polynomials to handle a wide range of class invariants. For suitable discriminants D, this improves its performance by a large constant factor, more than 200 in the most favourable circumstances. This has enabled record-breaking constructions of elliptic curves via the CM method, including examples with |D|>10^15.
description: 15 pages, final version, to appear in ANTS IX (Algorithmic Number Theory Symposium, 2010)
Relations between SU(2)- and SU(3)-LECs in chiral perturbation theory
Creators: name: Gasser, Juerg
name: Haefeli, Christoph
name: Ivanov, Mikhail A.
name: Schmid, Martin
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Chiral perturbation theory in the two--flavour sector allows one to analyse Green functions in QCD in the limit where the strange quark mass is considered to be large in comparison to the external momenta and to the light quark masses m_u and m_d. In this framework, the low--energy constants of SU{2}_R \times SU{2}_L depend on the value of the heavy quark masses. For the coupling constants which occur at order p^2 and p^4 in the chiral expansion, we worked out the dependence on the strange quark mass at two--loop accuracy, and provided analogous relations for some of the couplings c_i which are relevant at order p^6. This talk comments on the methods used, and illustrates implications of the results obtained.
description: Invited talk given at "6th International Workshop on Chiral Dynamics", July 6-10, 2009, Bern, Switzerland. To appear in the Proceedings [PoS]. 9 pages, 1 figure. 1 reference added
HQET at order 1/m: I. Non-perturbative parameters in the quenched approximation
Creators: name: Blossier, Benoît
name: Della Morte, Michele
name: Garron, Nicolas
name: Sommer, Rainer
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We determine non-perturbatively the parameters of the lattice HQET Lagrangian and those of the time component of the heavy-light axial-vector current in the quenched approximation. The HQET expansion includes terms of order 1/m. Our results allow to compute, for example, the heavy-light spectrum and B-meson decay constants in the static approximation and to order 1/m in HQET. The determination of the parameters is separated into universal and non-universal parts. The universal results can be used to determine the parameters for various discretizations. The computation reported in this paper uses the plaquette gauge action and the "HYP1/2" action for the b-quark described by HQET. The parameters of the current also depend on the light-quark action, for which we choose non-perturbatively O(a)-improved Wilson fermions.
description: 31 pages (19 pages + technical appendices) pdflatex. Discussion of vector current removed. Replaced by the published version, references added
Dancing with Donors: Trust-Building Across Gaps of Curation
Creators: name: Munshower, Alan
name: Kinnaman, Alex
Publisher: name: Zenodo
Year: 2024
Subjects: digital preservation
community archives
digital archives
donors
collaboration

description: Virginia Tech University Libraries (VTUL) serves a range of cultural heritage, academic, and local communities aligned in the goal to “get stuff online and accessible.” Despite the same overarching goal, the specific requirements from each party to reach that goal do not always overlap. The initial dance of negotiation between library and donor collaborations sets the tone for the ongoing relationship between the two. Across the departments in VTUL that manage such relationships with donors and curate digital collections, there are common trends emerging in barriers and observations with building relationships, and also with the concessions, compromises, and adjustments made to meet the curation needs of both parties. There are noted gaps in priorities and knowledge of curation processes, expectations around the understanding of digital collections, communication and roles and responsibilities, and resource understandability and availability. This presentation and paper of the same name specifically addresses relationships with donors and that impact on the subsequent work resulting from agreement with both parties.
Universality of Sudden Death of Entanglement
Creators: name: Fanchini, F. F.
name: Mendonca, P. E. M. F.
name: Napolitano, R. d. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a constructive argument to demonstrate the universality of the sudden death of entanglement in the case of two non-interacting qubits, each of which generically coupled to independent Markovian environments at zero temperature. Conditions for the occurrence of the abrupt disappearance of entanglement are determined and, most importantly, rigorously shown to be almost always satisfied: Dynamical models for which the sudden death of entanglement does not occur are seen to form a highly idealized zero-measure subset within the set of all possible quantum dynamics.
description: Published version
Breakdown of macroscopic quantum self-trapping in coupled mesoscopic one dimensional Bose gases
Creators: name: Hipolito, Rafael
name: Polkovnikov, Anatoli
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Two coupled BECs with a large population imbalance exhibit macroscopic quantum self-trapping (MQST) if the ratio of interaction energy to tunneling energy is above a critical value. Here we investigate effect of quantum fluctuations on MQST. In particular, we analyze the dynamics of a system of two elongated Bose gases prepared with a large population imbalance, where due to the quasi one dimensional character of the gas we no longer have true long range order, and the effect of quantum fluctuations is much more important. We show that MQST is possible in this system, but even when it is achieved it is not always dynamically stable. Using this instability one can construct states with sharply peaked momentum distributions around characteristic momenta dependent on system parameters. Our other finding is the nonmonotonic oscillating dependence of the decay rate of the MQST on the length of the wires. We also address the interesting question of thermalization in this system and show that it occurs only in sufficiently long wires.
description: 18 pages, 13 figures. Figures changed since last version for clearer presentation. New discussion in section 2d on physical significance of second unstable region. New discussion on effect of potential bias in conclusion
Letter from Kathleen Raine to Robin Skelton, [between 1950 and 1959], [02]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Periodicals--Publishing
valueUri: http://id.worldcat.org/fast/1058100
subject: English poetry--Manuscripts
valueUri: http://id.worldcat.org/fast/912320
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Book industries and trade
valueUri: http://id.worldcat.org/fast/836171
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Neoplatonism
valueUri: http://id.worldcat.org/fast/1035884
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Platonists
valueUri: http://id.worldcat.org/fast/1066881
subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: Philosophy
valueUri: http://id.worldcat.org/fast/1060777
subject: FOS: Philosophy, ethics and religion

description: Part of a collection of correspondence from Kathleen Raine to Robin Skelton. Skelton was a British poet, academic, anthologist, and practicing Wiccan. He taught at Manchester University before emigrating to Canada in 1963, where he taught creative writing at the University of Victoria and started the literary magazine The Malahat Review. Also included are some letters to Skelton’s wife Sylvia, and his daughters. Spanning close to forty-five years, the correspondence discusses poetry, writing, and philosophy; particularly Platonism and Neoplatonism. Raine often refers to the writings of William Blake and W. B. Yeats. Many letters also mention contemporary literary figures at the time including: Herbert Read, Peter Russell, Liam Miller, and Thurairajah Tambimuttu. In this letter, Raine describes the experience of writing a particular poem she wrote several years ago, and about being a poet living in London.
On the Davenport constant and group algebras
Creators: name: Smertnig, Daniel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11P70, 11B50, 20K01, 11B30

description: For a finite abelian group $G$ and a splitting field $K$ of $G$, let $d(G, K)$ denote the largest integer $l \in \N$ for which there is a sequence $S = g_1 \cdot ... \cdot g_l$ over $G$ such that $(X^{g_1} - a_1) \cdot ... \cdot (X^{g_l} - a_l) \ne 0 \in K[G]$ for all $a_1, ..., a_l \in K^{\times}$. If $D(G)$ denotes the Davenport constant of $G$, then there is the straightforward inequality $D(G)-1 \le d (G, K)$. Equality holds for a variety of groups, and a standing conjecture of W. Gao et.al. states that equality holds for all groups. We offer further groups for which equality holds, but we also give the first examples of groups $G$ for which $D(G) -1 < d(G, K)$ holds. Thus we disprove the conjecture.
description: 12 pages; fixed typos and clearer proof of Lemma 3.9
Free energy reconstruction from steered dynamics without post-processing
Creators: name: Athènes, Manuel
name: Marinica, Mihai-Cosmin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Various methods achieving importance sampling in ensembles of nonequilibrium trajectories enable to estimate free energy differences and, by maximum-likelihood post-processing, to reconstruct free energy landscapes. Here, based on Bayes theorem, we propose a more direct method in which a posterior likelihood function is used both to construct the steered dynamics and to infer the contribution to equilibrium of all the sampled states. The method is implemented with two steering schedules. First, using non-autonomous steering, we calculate the migration barrier of the vacancy in Fe-alpha. Second, using an autonomous scheduling related to metadynamics and equivalent to temperature-accelerated molecular dynamics, we accurately reconstruct the two-dimensional free energy landscape of the 38-atom Lennard-Jones cluster as a function of an orientational bond-order parameter and energy, down to the solid-solid structural transition temperature of the cluster and without maximum-likelihood post-processing.
description: Accepted manuscript in Journal of Computational Physics, 7 figures
Magneto-optical trapping and background-free imaging for atoms near nanostructured surfaces
Creators: name: Ohadi, Hamid
name: Himsworth, Matthew
name: Xuereb, André
name: Freegarde, Tim
Publisher: name: arXiv
Year: 2009
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We demonstrate a combined magneto-optical trap and imaging system that is suitable for the investigation of cold atoms near surfaces. In particular, we are able to trap atoms close to optically scattering surfaces and to image them with an excellent signal-to-noise ratio. We also demonstrate a simple magneto-optical atom cloud launching method. We anticipate that this system will be useful for a range of experimental studies of novel atom-surface interactions and atom trap miniaturization.
description: 7 pages, 7 figures
Limit distributions for large Pólya urns
Creators: name: Chauvin, Brigitte
name: Pouyanne, Nicolas
name: Sahnoun, Reda
Publisher: name: arXiv
Year: 2009
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We consider a two-color Pólya urn in the case when a fixed number $S$ of balls is added at each step. Assume it is a large urn that is, the second eigenvalue $m$ of the replacement matrix satisfies $1/2
description: Published in at http://dx.doi.org/10.1214/10-AAP696 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Unconventional magnetism in imbalanced Fermi systems with magnetic dipolar interactions
Creators: name: Fregoso, Benjamin M.
name: Fradkin, Eduardo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the magnetic structure of the ground state of an itinerant Fermi system of spin-\nicefrac{1}{2} particles with magnetic dipole-dipole interactions. We show that, quite generally, the spin state of particles depend on its momentum, i.e., spin and orbital degrees of freedom are entangled and taken separately are not ``good'' quantum numbers. Specifically, we consider a uniform system with non-zero magnetization at zero temperature. Assuming the magnetization is along $z$-axis, the quantum spin states are $ǩ$-dependent linear combinations of eigenstates of the $σ_z$ Pauli matrix. This leads to novel spin structures in \textit{momentum space} and to the fact that the Fermi surfaces for ``up'' and ``down'' spins are not well defined. The system still has a cylindrical axis of symmetry along the magnetization axis. We also show that the self energy has a universal structure which we determine based on the symmetries of the dipolar interaction and we explicitly calculated it in the Hartree-Fock approximation. We show that the bare magnetic moment of particles is renormalized due to particle-particle interactions and we give order of magnitude estimates of this renormalization effect. We estimate that the above mentioned dipolar effects are small but we discuss possible scenarios where this physics may be realized in future experiments.
description: 10 pages, 6 figures(2 subfigures); 4 appendices. Version published in Physical Review B
Hydrocyclone efficiency
Creators: name: Solberg, Harald Fredrik
Publisher: name: University of British Columbia
Year: 2010

description: The efficiency of a 4 inch hydrocyclone was studied using a suspension of fine silica at pulp. densities of up to 507o solids by weight. The variables manipulated were diameter of the vortex finder, flowrate, percent solids in the feed and cyclone length. Slurry temperature was also measured. All measurements were made with the spigot adjusted to give the same degree of roping at the underflow. The product size distributions were analysed using an electronic particle sizing instrument similar to the "Coulter Counter" but interfaced with a digital computer. An advantage of this method is the continuous curves produced (154 data points per run). Equations were developed by means of stepwise regression analyses to predict (I) separating size, (2) inlet pressure, (3) bypass ratio, (4) sharpness of classification, alpha, (5) zero classification size and (6) water recovery in the underflow, as a function of hydrocyclone variables including temperature of the feed slurry. Two forms of a roping constraint equation were obtained. One predicts the underflow percent solids at which roping occurs, whilst the other gives the spigot size required to avoid roping. The separating size was found to depend on several factors including the temperature of the feed slurry. Moreover, the sharpness of classification, alpha, was identified to be a variable parameter. This parameter was found to be dependent on variables such as vortex finder diameter and the volume recovery of slurry to the overflow. The variability of alpha has not been widely recognized. Acceptance of this variability concept offers hope that classification efficiencies may be improved by choosing the proper combination of variables in an operating environment. Interestingly, the zero classification size was judged to be a constant at the 0.05 level of significance. The bypass ratio depended primarily on the water split, as expected, but was also influenced by the cyclone feed percent solids. It is suggested that this particular study advances the understanding of sub-sieve sized particle behaviour in hydrocyclones fed with slurries containing a high proportion of solids.
Political dynamics affected by turncoats
Creators: name: Di Salvo, Rosa
name: Gorgone, Matteo
name: Oliveri, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: An operatorial theoretical model based on raising and lowering fermionic operators for the description of the dynamics of a political system consisting of macro--groups affected by turncoat--like behaviors is presented. The analysis of the party system dynamics is carried on by combining the action of a suitable quadratic Hamiltonian operator with specific rules (depending on the variations of the mean values of the observables) able to adjust periodically the conservative model to the political environment.
description: 16 pages, 11 figures. arXiv admin note: text overlap with arXiv:2108.00403
Approximately invariant solutions of creeping flow equations
Creators: name: Gorgone, Matteo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, the steady creeping flow equations of a second grade fluid in cartesian coordinates are considered; the equations involve a small parameter related to the dimensionless non--Newtonian coefficient. According to a recently introduced approach, the first order approximate Lie symmetries of the equations are computed, some classes of approximately invariant solutions are explicitly determined, and a boundary value problem is analyzed. The main aim of the paper is methodological, and the considered mechanical model is used to test the reliability of the procedure in a physically important application.
description: 29 pages, no figures
Learning-based Preference Prediction for Constrained Multi-Criteria Path-Planning
Creators: name: Osanlou, Kevin
name: Guettier, Christophe
name: Bursuc, Andrei
name: Cazenave, Tristan
name: Jacopin, Eric
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Learning-based methods are increasingly popular for search algorithms in single-criterion optimization problems. In contrast, for multiple-criteria optimization there are significantly fewer approaches despite the existence of numerous applications. Constrained path-planning for Autonomous Ground Vehicles (AGV) is one such application, where an AGV is typically deployed in disaster relief or search and rescue applications in off-road environments. The agent can be faced with the following dilemma : optimize a source-destination path according to a known criterion and an uncertain criterion under operational constraints. The known criterion is associated to the cost of the path, representing the distance. The uncertain criterion represents the feasibility of driving through the path without requiring human intervention. It depends on various external parameters such as the physics of the vehicle, the state of the explored terrains or weather conditions. In this work, we leverage knowledge acquired through offline simulations by training a neural network model to predict the uncertain criterion. We integrate this model inside a path-planner which can solve problems online. Finally, we conduct experiments on realistic AGV scenarios which illustrate that the proposed framework requires human intervention less frequently, trading for a limited increase in the path distance.
description: arXiv admin note: text overlap with arXiv:2108.00978