cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Frame transforms, star products and quantum mechanics on phase space
Creators: name: Aniello, P.
name: Man'ko, V. I.
name: Marmo, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using the notions of frame transform and of square integrable projective representation of a locally compact group $G$, we introduce a class of isometries (tight frame transforms) from the space of Hilbert-Schmidt operators in the carrier Hilbert space of the representation into the space of square integrable functions on the direct product group $G\times G$. These transforms have remarkable properties. In particular, their ranges are reproducing kernel Hilbert spaces endowed with a suitable 'star product' which mimics, at the level of functions, the original product of operators. A 'phase space formulation' of quantum mechanics relying on the frame transforms introduced in the present paper, and the link of these maps with both the Wigner transform and the wavelet transform are discussed.
description: 48 pages
Dirichlet forms in simulation
Creators: name: Bouleau, Nicolas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 31C25 60H07 65G99 65C05 65C20

description: Equipping the probability space with a local Dirichlet form with square field operator $Γ$ and generator $A$ allows to improve Monte Carlo computations of expectations, densities, and conditional expectations, as soon as we are able to simulate a random variable $X$ together with $Γ[X]$ and $A[X]$. We give examples on the Wiener space, on the Poisson space and on the Monte Carlo space. When $X$ is real-valued we give an explicit formula yielding the density at the speed of the law of large numbers.
Multi-epoch spectroscopy of the globular cluster black hole in NGC 4472
Creators: name: Shih, I. C.
name: Maccarone, T. J.
name: Kundu, A.
name: Zepf, S. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the X-ray spectral properties of the highly variable X-ray emitting black hole in a globular cluster in the elliptical galaxy NGC 4472. The XMM-Newton spectrum of the source in its bright epoch is well described by a multiple blackbody model with a characteristic temperature $kT_{in}\approx$ 0.2 keV. The spectrum of an archival Chandra observation of the source obtained 3.5 years before the XMM data gives similar estimates for the blackbody parameters. We confirm that the fainter interval of the XMM-Newton observation has a spectrum that is consistent with the brighter epoch, except for an additional level of foreground absorption. We also consider other possible mechanisms for the variability. Based on the timescale of the X-ray flux decline and the estimated size of the X-ray emission region we argue that an eclipsing companion is highly unlikely. We find the most likely means of producing the absorption changes on the observed timescale is through partial obscuration by a precessing warped accretion disk.
description: Accepted for publication in MNRAS
A companion for the Kiefer--Wolfowitz--Blum stochastic approximation algorithm
Creators: name: Mokkadem, Abdelkader
name: Pelletier, Mariane
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62L20 (Primary); 62G08 (Secondary)

description: A stochastic algorithm for the recursive approximation of the location $θ$ of a maximum of a regression function was introduced by Kiefer and Wolfowitz [Ann. Math. Statist. 23 (1952) 462--466] in the univariate framework, and by Blum [Ann. Math. Statist. 25 (1954) 737--744] in the multivariate case. The aim of this paper is to provide a companion algorithm to the Kiefer--Wolfowitz--Blum algorithm, which allows one to simultaneously recursively approximate the size $μ$ of the maximum of the regression function. A precise study of the joint weak convergence rate of both algorithms is given; it turns out that, unlike the location of the maximum, the size of the maximum can be approximated by an algorithm which converges at the parametric rate. Moreover, averaging leads to an asymptotically efficient algorithm for the approximation of the couple $(θ,μ)$.
description: Published in at http://dx.doi.org/10.1214/009053606000001451 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Grammatical elicitation: Converbial phrases
Creators: name: Kipkoech, Linus
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .mp4 file and one .pdf file. Elicitation of converbial phrases with agreement paradigms and various arguments being modified by the converbial phrase.
Superclusters from velocity divergence fields
Creators: name: Peñaranda-Rivera, J. D.
name: Paipa-León, D. L
name: Hernández-Charpak, S. D.
name: Forero-Romero, J. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Superclusters are a convenient way to partition and characterize the large scale structure of the Universe. In this Letter we explore the advantages of defining superclusters as watershed basins in the divergence velocity field. We apply this definition on diverse datasets generated from linear theory and N-body simulations, with different grid sizes, smoothing scales and types of tracers. From this framework emerges a linear scaling relation between the average supercluster size and the autocorrelation length in the divergence field, a result that holds for one order of magnitude from 10 Mpc/h up to 100 Mpc/h. These results suggest that the divergence-based definition provides a robust context to quantitatively compare results across different observational or computational frameworks. Through its connection with linear theory, it can also facilitate the exploration of how supercluster properties depend on cosmological parameters, paving the way to use superclusters as cosmological probes.
description: 5 pages, 6 figures, accepted for publication in MNRAS Letters
"Nabelschau" als orthodox-hesychastische Tugend?
Creators: name: Vletsis, Athanasios
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 56 Nr. 3 (2007): Ökumenische Rundschau, Band 56, Heft 3
Semiclassical Lindblad master equation for spin dynamics
Creators: name: Dubois, J.
name: Saalmann, Ulf
name: Rost, Jan M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We derive the semi-classical Lindblad master equation in phase space for both canonical and non-canonical Poisson brackets using the Wigner-Moyal formalism and the Moyal star-product. The semi-classical limit for canonical dynamical variables, i.e., canonical Poisson brackets, is the Fokker-Planck equation, as derived before. We generalize this limit and show that it holds also for non-canonical Poisson brackets. Examples are gyro-Poisson brackets, which occur in spin ensembles, systems of recent interest in atomic physics and quantum optics. We show that the equations of motion for the collective spin variables are given by the Bloch equations of nuclear magnetization with relaxation. The Bloch and relaxation vectors are expressed in terms of the microscopic operators: The Hamiltonian and the Lindblad functions in the Wigner-Moyal formalism.
Unitary Correlation Operator Method and Similarity Renormalization Group: Connections and Differences
Creators: name: Roth, R.
name: Reinhardt, S.
name: Hergert, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss relations and differences between two methods for the construction of unitarily transformed effective interactions, the Similarity Renormalization Group (SRG) and Unitary Correlation Operator Method (UCOM). The aim of both methods is to construct a soft phase-shift equivalent effective interaction which is well suited for many-body calculations in limited model spaces. After contrasting the two conceptual frameworks, we establish a formal connection between the initial SRG-generator and the static generators of the UCOM transformation. Furthermore we propose a mapping procedure to extract UCOM correlation functions from the SRG evolution. We compare the effective interactions resulting from the UCOM-transformation and the SRG-evolution on the level of matrix elements, in no-core shell model calculations of light nuclei, and in Hartree-Fock calculations up to 208-Pb. Both interactions exhibit very similar convergence properties in light nuclei but show a different systematic behavior as function of particle number.
description: 13 pages, 11 figures; v2: minor changes following referees' comments
KO-Homology and Type I String Theory
Creators: name: Reis, Rui M. G.
name: Szabo, Richard J.
name: Valentino, Alessandro
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: K-Theory and Homology (math.KT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study the classification of D-branes and Ramond-Ramond fields in Type I string theory by developing a geometric description of KO-homology. We define an analytic version of KO-homology using KK-theory of real C*-algebras, and construct explicitly the isomorphism between geometric and analytic KO-homology. The construction involves recasting the Cl(n)-index theorem and a certain geometric invariant into a homological framework which is used, along with a definition of the real Chern character in KO-homology, to derive cohomological index formulas. We show that this invariant also naturally assigns torsion charges to non-BPS states in Type I string theory, in the construction of classes of D-branes in terms of topological KO-cycles. The formalism naturally captures the coupling of Ramond-Ramond fields to background D-branes which cancel global anomalies in the string theory path integral. We show that this is related to a physical interpretation of bivariant KK-theory in terms of decay processes on spacetime-filling branes. We also provide a construction of the holonomies of Ramond-Ramond fields in Type II string theory in terms of topological K-chains.
description: 40 pages; v4: Clarifying comments added, more detailed proof of main isomorphism theorem given; Final version to be published in Reviews in Mathematical Physics
Resummations in QCD hard-scattering at large and small x
Creators: name: Kidonakis, Nikolaos
name: Vera, Agustin Sabio
name: Stephens, Philip
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss different resummations of large logarithms that arise in hard-scattering cross sections of quarks and gluons in regions of large and small x. The large-x logarithms are typically dominant near threshold for the production of a specified final state. These soft and collinear gluon corrections produce large enhancements of the cross section for many processes, notably top quark and Higgs production, and typically the higher-order corrections reduce the factorization and renormalization scale dependence of the cross section. The small-x logarithms are dominant in the regime where the momentum transfer of the hard sub-process is much smaller than the total collision energy. These logarithms are important to describe multijet final states in deep inelastic scattering and hadron colliders, and in the study of parton distribution functions. The resummations at small and large x are linked by the eikonal approximation and are dominated by soft gluon anomalous dimensions. We will review their role in both contexts and provide some explicit calculations at one and two loops.
description: 36 pages, 12 figures, invited contribution to the edited book "The Physics of Quarks"; Eqs. 31 and 47 corrected, references updated
Gravity Control Propulsion: Towards a General Relativistic Approach
Creators: name: Bertolami, O.
name: Pedro, F. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Space Physics (physics.space-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Evaluation of gravity control concepts should be examined with respect to currently known physical theories. In this work we study the hypothetical conversion of gravitational potential energy into kinetic energy using the formalism of general relativity. We show that the energy involved in the process greatly exceeds the Newtonian estimate, given the nature of general relativity. We conclude that the impact of any gravity manipulation for propulsion greatly depends fundamentally on its exact definition.
description: 14 pages, 1 figure, PDF file
Raman scattering in a d-wave superconductor - a one gap scenario
Creators: name: Chubukov, A. V.
name: Norman, M. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent Raman scattering data in B_{1g} and B_{2g} geometries in the superconducting state of underdoped cuprates were interpreted as evidence for two distinct energy gaps. We argue that these data can be equally well explained within a one gap scenario if final state interactions are taken into account. In particular, we show that they can account for the differing doping dependences of the Raman peaks in these two geometries.
description: 8 pages, 10 figures, submitted to PRB
The evolution of network controllability in growing networks
Creators: name: Zhang, Rui
name: Wang, Xiaomeng
name: Cheng, Ming
name: Jia, Tao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The study of network structural controllability focuses on the minimum number of driver nodes needed to control a whole network. Despite intensive studies on this topic, most of them consider static networks only. It is well-known, however, that real networks are growing, with new nodes and links added to the system. Here, we analyze controllability of evolving networks and propose a general rule for the change of driver nodes. We further apply the rule to solve the problem of network augmentation subject to the controllability constraint. The findings fill a gap in our understanding of network controllability and shed light on controllability of real systems.
Search for associations containing young stars (SACY) VIII. An updated census of spectroscopic binary systems showing hints of non-universal multiplicity among these associations
Creators: name: Zúñiga-Fernández, S.
name: Bayo, A.
name: Elliott, P.
name: Zamora, C.
name: Corvalán, G.
name: Haubois, X.
name: Corral-Santana, J. M.
name: Olofsson, J.
name: Huélamo, N.
name: Sterzik, M. F.
name: Torres, C. A. O.
name: Quast, G. R.
name: Melo, C. H. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We seek to update the spectroscopy binary fraction of the SACY (Search for Associations Containing Young stars) sample taking in consideration all possible biases in our identification of binary candidates, such as activity and rotation. Using high-resolution spectroscopic observations we have produced $\sim$1300 cross-correlation functions (CCFs) to disentangle the previously mentioned sources of contamination. The radial velocity values obtained were cross-matched with the literature and were used to revise and update the spectroscopic binary (SB) fraction in each of the SACY association. In order to better describe the CCF profile, we calculated a set of high-order cross-correlation features to determine the origin of the variations in radial velocities. We identified 68 SB candidates from our sample of 410 objects. Our results hint that the youngest associations have a higher SB fraction. Specifically, we found sensitivity-corrected SB fractions of $22 \substack{+15 \\ -11} \%$ for $ε$~Cha , $31 \substack{+16 \\ -14} \%$ for TW Hya and $32 \substack{+9 \\ -8} \%$ for $β$~Pictoris, in contrast with the five oldest ($\sim 35-125$ Myr) associations we have sampled which are $\sim 10\%$ or lower. This result seems independent of the methodology used to asses membership to the associations. The new CCF analysis, radial velocity estimates and SB candidates are particularly relevant for membership revision of targets in young stellar associations. These targets would be ideal candidates for follow-up campaigns using high-resolution techniques in order to confirm binarity, resolve the orbits, and ideally calculate dynamical masses. Additionally, if the results on SB fraction in the youngest associations are confirmed, it could hint of non-universal multiplicity among SACY associations.
description: The paper has been accepted in A&A
Masking of beluga whale (delphinapterus leucas) vocalizations by icebreaker noise
Creators: name: Erbe, Christine
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines the masking effect of underwater noise on beluga whale communication. As ocean water is greatly opaque for light but well conducting for sound, marine mammals rely primarily on their hearing for orientation and communication. Man-made underwater noise has the potential of interfering with sounds used by marine mammals. Masking to the point of incomprehensibility can have fatal results-for the individual, but ultimately for the entire species. As part of our understanding of whether marine mammals can cope with human impact on nature, this thesis is the first to study the interference of real ocean noises with complex animal vocalizations. At the Vancouver Aquarium, a beluga whale was trained for acoustic experiments, during which masked hearing thresholds were measured. Focus lay on noise created by icebreaking ships in the Arctic. As experiments with trained animals are time and cost expensive, various techniques were examined for their ability to model the whale's response. These were human hearing tests, visual spectrogram discrimination, matched filtering, spectrogram cross-correlation, critical band cross-correlation, adaptive filtering and various types of artificial neural networks. The most efficient method with respect to similarity to the whale's data and speed, was a backpropagation neural net. Masked hearing thresholds would be of little use if they could not be related to accessible quantities in the wild. An ocean sound propagation model was applied to determine critical distances between a noise source, a calling whale and a listening whale. Colour diagrams, called maskograms, were invented to illustrate zones of masking in the wild. Results are that bubbler system noise with a source level of 194 dB re 1 μPa at 1 m has a maximum radius of masking of 15 km in a 3-dimensional ocean. Propeller noise with a source level of 203 dB re 1 μPa at 1 m has a maximum radius of masking of 22 km. A naturally occurring icecracking event with a source level of 147 dB re 1 μPa at 1 m only masks if the listening whale is within 8 m of the event. Therefore, in the wild, propeller cavitation noise masks furthest, followed by bubbler system noise, then icecracking noise.
Scattering of elastic waves by elastic spheres in a NaCl-type phononic crystal
Creators: name: Chen, Huanyang
name: Luo, Xudong
name: Ma, Hongru
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Based on the formalism developed by Psarobas et al [Phys. Rev. B 62, 278(2000)], which using the multiple scattering theory to calculate properties of simple phononic crystals, we propose a very simple method to study the NaCl-type phononic crystal. The NaCl-type phononic crystal consists of two kinds of non-overlapping elastic spheres with different mass densities, $L\acute{a}me$ coefficients and radius following the same periodicity of the ions in the real NaCl crystal. We focus on the (001) surface, and view the crystal as a sequence of planes of spheres, each plane of spheres has identical 2D periodicity. We obtained the complex band structure of the infinite crystal associated with this plane, and also calculated the transmission, reflection and absorption coefficients for an elastic wave (longitudinal or transverse) incident, at any angle, on a slab of the crystal of finite thickness.
description: 15 pages, 6 figures
Improving Medical Annotation Quality to Decrease Labeling Burden Using Stratified Noisy Cross-Validation
Creators: name: Hsu, Joy
name: Phene, Sonia
name: Mitani, Akinori
name: Luo, Jieying
name: Hammel, Naama
name: Krause, Jonathan
name: Sayres, Rory
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: As machine learning has become increasingly applied to medical imaging data, noise in training labels has emerged as an important challenge. Variability in diagnosis of medical images is well established; in addition, variability in training and attention to task among medical labelers may exacerbate this issue. Methods for identifying and mitigating the impact of low quality labels have been studied, but are not well characterized in medical imaging tasks. For instance, Noisy Cross-Validation splits the training data into halves, and has been shown to identify low-quality labels in computer vision tasks; but it has not been applied to medical imaging tasks specifically. In this work we introduce Stratified Noisy Cross-Validation (SNCV), an extension of noisy cross validation. SNCV can provide estimates of confidence in model predictions by assigning a quality score to each example; stratify labels to handle class imbalance; and identify likely low-quality labels to analyze the causes. We assess performance of SNCV on diagnosis of glaucoma suspect risk from retinal fundus photographs, a clinically important yet nuanced labeling task. Using training data from a previously-published deep learning model, we compute a continuous quality score (QS) for each training example. We relabel 1,277 low-QS examples using a trained glaucoma specialist; the new labels agree with the SNCV prediction over the initial label >85% of the time, indicating that low-QS examples mostly reflect labeler errors. We then quantify the impact of training with only high-QS labels, showing that strong model performance may be obtained with many fewer examples. By applying the method to randomly sub-sampled training dataset, we show that our method can reduce labelling burden by approximately 50% while achieving model performance non-inferior to using the full dataset on multiple held-out test sets.
Characterising and tracking Australian desert dust and its sources
Creators: name: Munday, Christopher Ian
Publisher: name: The Australian National University
Year: 2014
Subjects: subject: Dust Australia Eyre, Lake, Region (S. Aust.)
subject: Dust Microbiology Australia Eyre, Lake, Region (S. Aust.)
subject: Microbial ecology Australia Eyre, Lake, Region (S. Aust.)
subject: Deserts Australia
subject: Dust Storms Australia

description: The Lake Eyre Region (LER) in Australia is the primary source of dust in the southern hemisphere. Little is known about the microbial ecology of this area, and its relationship if any to the bacteria found in dust and aerosols. Initially, sediment and adjacent aerosol samples were collected from a small lake in Victoria which routinely deflated. Bacterial populations in both samples were compared by culturing followed by Rep-PCR, and 16S rRNA high throughput sequencing (HTS). Bacillus subtilis isolates of the same Rep type, and sequences representing the same OTUs of Salinomicrobium and Delftia were present in both aerosols and sediment. These results indicated that bacteria could be tracked through the environment regardless of the vast microbial diversity observed using both techniques. Subsequently, bacterial communities in aerosols collected off the coast of Australia were characterised and two different sampling methods compared; filtration and a high volume swirling liquid sampler (OMNI 3000). The weather conditions were calm during both voyages. The microflora of the OMNI samples showed less diversity than the filter samples. Delftia, Methylobacterium, and Stenotrophomonas were present in samples from both voyages. HTS was then used to compare the microbiology of LER sediment, aerosols, and samples collected from major dust storms which affected eastern Australia in September 2009. There was vast microbial diversity within and among LER sediments of different types, desert crusts, salt lake crusts and fluff, collected in the same location, collected over time, and collected in different locations. Comparison of the microflora of dust to LER sediments revealed similarities to samples collected from specific locations that broadly correlated to the proposed source of the dust storm determined by multidisciplinary analyses. Dominant OTUs, representing Delftia, Stenotrophomonas, Acidovorax, and other taxa, were present in dust and source samples, with many of these genera also found in aerosols collected from different locations. Our results highlight the vast microbial diversity across the different samples collected, and has identified some of the dominant taxa in the Australian environment.
Grammatical elicitation: Converbial phrases and complementation
Creators: name: Yegon, Kiplangat
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .mp4 file and one .pdf file. Elicitation of converbial phrases with subjunctive agreement paradigms. Beginning of elicitation on nominal objects of embedding verbs.
Distributed Differentially Private Mutual Information Ranking and Its Applications
Creators: name: Srivastava, Ankit
name: Pouyanfar, Samira
name: Allen, Joshua
name: Johnston, Ken
name: Ma, Qida
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Computation of Mutual Information (MI) helps understand the amount of information shared between a pair of random variables. Automated feature selection techniques based on MI ranking are regularly used to extract information from sensitive datasets exceeding petabytes in size, over millions of features and classes. Series of one-vs-all MI computations can be cascaded to produce n-fold MI results, rapidly pinpointing informative relationships. This ability to quickly pinpoint the most informative relationships from datasets of billions of users creates privacy concerns. In this paper, we present Distributed Differentially Private Mutual Information (DDP-MI), a privacy-safe fast batch MI, across various scenarios such as feature selection, segmentation, ranking, and query expansion. This distributed implementation is protected with global model differential privacy to provide strong assurances against a wide range of privacy attacks. We also show that our DDP-MI can substantially improve the efficiency of MI calculations compared to standard implementations on a large-scale public dataset.
Enhancing Application Performance by Memory Partitioning in Android Platforms
Creators: name: Lim, Geunsik
name: Min, Changwoo
name: Eom, Young Ik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Operating Systems (cs.OS)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: This paper suggests a new memory partitioning scheme that can enhance process lifecycle, while avoiding Low Memory Killer and Out-of-Memory Killer operations on mobile devices. Our proposed scheme offers the complete concept of virtual memory nodes in operating systems of Android devices.
Philasterides armatus Kahl 1931
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Oligohymenophorea
Philasterida
Philasteridae
Philasterides
Philasterides armatus

description: Philasterides armatus (Kahl, 1926) Kahl, 1931
Distribution. BRAZIL: Paraná River between the Nupelia’s Field Station and the district of Porto São José, São Pedro do Paraná (Buosi et al. 2014 b, 2015), (Ad).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 33, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
A sensitive submillimetre survey of Broad Absorption Line quasars
Creators: name: Priddey, R. S.
name: Gallagher, S. C.
name: Isaak, K. G.
name: Sharp, R. G.
name: McMahon, R. G.
name: Butner, H. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the SCUBA bolometer array on the JCMT, we have carried out a submillimetre survey of Broad Absorption Line quasars (BALQs). The sample has been chosen to match, in redshift and optical luminosity, an existing benchmark 850um sample of radio-quiet quasars, allowing a direct comparison of the submm properties of BAL quasars relative to the parent radio-quiet population. We reach a submm limit 1.5mJy at 850um, allowing a more rigorous measure of the submm properties of BAL quasars than previous studies. Our submm photometry complements extensive observations at other wavelengths, in particular X-rays with Chandra and mid-infrared with Spitzer. To compare the 850um flux distribution of BALQs with that of the non-BAL quasar benchmark sample, we employ a suite of statistical methods, including survival analysis and a novel Bayesian derivation of the underlying flux distribution. Although there are no strong grounds for rejecting the null hypothesis that BALQs on the whole have the same submm properties as non-BAL quasars, we do find tentative evidence (1-4 percent significance from a K-S test and survival analysis) for a dependence of submm flux on the equivalent width of the characteristic CIV broad absorption line. If this effect is real - submm activity is linked to the absorption strength of the outflow - it has implications either for the evolution of AGN and their connection with star formation in their host galaxies, or for unification models of AGN.
description: Replaced with published version: minor corrections. 11 pages, 4 figures. MNRAS, in press
Walking droplets, swimming microbes: on memory in physics and life
Creators: name: Libchaber, Albert
name: Tlusty, Tsvi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biological Physics (physics.bio-ph)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Whirling and swerving, a bacterium is swimming in a test tube, foraging for food. On the surface of a vibrating bath, a droplet starts walking. A certain similarity, but mostly dissimilarity, between the physical memory that emerges in Couder's droplet experiments and the biological memory of the bacterium is noted. It serves as a starting point for a short perspective and speculation on the multilevel, loopy memory of living matter.
William Percy's Faery Pastorall: an old spelling edition
Creators: name: Fenn, Robert Denzel
Publisher: name: University of British Columbia
Year: 2009

description: William Percy (1573 - 1648) wrote The Faery Pastorall in 1603 with the expectation that it would be performed before King James, probably when the new king visited. Sion House to thank the Earl, Percy's older brother, for assisting James's efforts to succeed Elizabeth on the English throne. The Faery Pastorall is one of five plays Percy wrote between 1601 and 1603, all of which may have been used as part of the Percy family's backing of James's bid for the crown. The plays remain in three separate manuscripts transcribed by Percy himself in his old age. Two of the three documents, Alnwick Castle MS 508 (1644) and Alnwick Castle MS 509 (1646), remain in the Duke of Northumberland's library, and one, the copy text for this edition, Huntington MS HM4 (1647), is in the Huntington Library in California. Although there is no evidence that any of Percy's plays was ever produced, the plays are valuable to theatre historians, because they include many stage directions and full descriptions of the staging and properties that Percy expected to be at his disposal. This edition of The Faery Pastorall includes an introduction which examines Percy's life, the history and description of the manuscripts, the possibility of the play's performance, its structure and themes, sources and analogues, and the stage directions and list of properties. Also included are an old-spelling version of the text complete with textual notes incorporating substantive variations of all three manuscripts, two appendices incorporating valuable material from the manuscripts not included in the play proper, and a full commentary glossing difficult words and passages.
title: British Journal for Military History, Vol 8 No 1 (2022): Vol 8 No 1 (2022)
title: Vol 8 No 1 (2022)
titleType: AlternativeTitle
Creators: name: British Journal For Military History
Publisher: name: British Journal for Military History
Year: 2022

description: Editorial...1 The Sicilian Expedition Reconsidered...2-19 Sustaining Britain’s First ‘Citizen Army’: the Creation and Evolution of Reinforcement Policy for Kitchener’s New Armies, 1914-1916...20-39 Henning von Tresckow in Poland in 1939: The Future anti-Hitler Frondeur and the Origins of the Holocaust...40-68 British Army Cold Weather and Mountain Warfare Training in the Second World War...69-86 Learning to Fail? Wartime Adaptation and Special Force in Burma, 1942–1944...87-105 Lieutenant-Colonel James Leslie Kincaid and the Emergency Response to the 1944 Eruption of Mount Vesuvius, Southern Italy...106-128 The Origins of Offensive Counterinsurgency During the Greek Civil War...129-151 Anti-Imperialist Pamphleteering: Understanding Global Jihad in Wartime India, 1914-1918...152-166 Jeremy Black, Logistics: The Key to Victory...167-168 Matthew Hefferan, The Household Knights of Edward III: Warfare, Politics and Kingship in Fourteenth-Century England...168-170 Imogen Peck, Recollections in the Republics: Memories of the British Civil Wars in England, 1649-1659...171-173 Jeremy Black, How the Army made Britain a Global Power, 1688-1815...173-174 Matilda Greig, Dead Men Telling Tales, Napoleonic War Veterans and the Military Memoir industry, 1808-1914...175-176 Włodzimierz Borodziej and Maciej Górny, Forgotten Wars: Central and Eastern Europe, 1912-1916...177-178 Robert Sackville-West, The Searchers: A Quest for the Lost of the First World War...179-180 Robert Lyman, A War of Empires: Japan, India, Burma & Britain 1941-45...180-182 Raymond A Callahan & Daniel Marston, The 1945 Burma Campaign and the Transformation of the British Indian Army...182-184 Volker Ullrich (trans. Jefferson Chase), Eight Days in May...184-186
Symmetries, Spinning Particles and the TCFH of D=4,5 Minimal Supergravities
Creators: name: Papadopoulos, G.
name: Pérez-Bolaños, and E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We find that spinning particles with suitable couplings propagating in certain supersymmetric backgrounds of $D=4$, $N=2$ and $D=5$, $N=1$ minimal supergravities are invariant under symmetries generated by the twisted covariant form hierarchies of these theories. We also compare our results with the symmetries of spinning particles generated by Killing-Yano forms which are responsible for the separability properties of some gravitational backgrounds.
description: 12 pages
Paired state in an integrable spin-1 boson model
Creators: name: Cao, Junpeng
name: Jiang, Yuzhu
name: Wang, Yupeng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: An exactly solvable model describing the low density limit of the spin-1 bosons in a one-dimensional optical lattice is proposed. The exact Bethe ansatz solution shows that the low energy physics of this system is described by a quantum liquid of spin singlet bound pairs. Motivated by the exact results, a mean-field approach to the corresponding three-dimensional system is carried out. Condensation of singlet pairs and coexistence with ordinary Bose-Einstein condensation are predicted.
description: 6 pages, 1 figure, Revised version
Tune-out wavelengths of the hyperfine components of the ground level of $^{133}$Cs atoms
Creators: name: Jiang, Jun
name: Li, Xian-Jun
name: Wang, Xia
name: Dong, Chen-Zhong
name: Wu, Z. W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The static and dynamic electric-dipole polarizabilities and tune-out wavelengths for the ground state of Cs atoms are calculated by using a semiempirical relativistic configuration interaction plus core polarization approach. By considering the hyperfine splittings, the static and dynamic polarizabilities, hyperfine Stark shifts, and tune-out wavelengths of the hyperfine components of the ground level of $^{133}$Cs atoms are determined. It is found that the hyperfine shifts of the first primary tune-out wavelengths are about $-$0.0135 nm and 0.0106 nm, which are very close to the hyperfine interaction energies. Additionally, the contribution of the tensor polarizability to the tune-out wavelengths is determined to be about $10^{-5} \sim 10^{-6}$ nm.
description: 11 pages, 2 figures. Accepted in Phys. Rev. A
Generalizations of the projective reconstruction theorem
Creators: name: Nasihatkon, Behrooz
Publisher: name: The Australian National University
Year: 2014
Subjects: subject: Geometry, projective
subject: Computer vision
subject: Image reconstruction
subject: Image processing Mathematics

description: We present generalizations of the classic theorem of projective reconstruction as a tool for the design and analysis of the projective reconstruction algorithms. Our main focus is algorithms such as bundle adjustment and factorization-based techniques, which try to solve the projective equations directly for the structure points and projection matrices, rather than the so called tensor-based approaches. First, we consider the classic case of 3D to 2D projections. Our new theorem shows that projective reconstruction is possible under a much weaker restriction than requiring, a priori, that all estimated projective depths are nonzero. By completely specifying possible forms of wrong configurations when some of the projective depths are allowed to be zero, the theory enables us to present a class of depth constraints under which any reconstruction of cameras and points projecting into given image points is projectively equivalent to the true camera-point configuration. This is very useful for the design and analysis of different factorization-based algorithms. Here, we analyse several constraints used in the literature using our theory, and also demonstrate how our theory can be used for the design of new constraints with desirable properties. The next part of the thesis is devoted to projective reconstruction in arbitrary dimensions, which is important due to its applications in the analysis of dynamical scenes. The current theory, due to Hartley and Schaffalitzky, is based on the Grassmann tensor, generalizing the notions of Fundamental matrix, trifocal tensor and quardifocal tensor used for 3D to 2D projections. We extend their work by giving a theory whose point of departure is the projective equations rather than the Grassmann tensor. First, we prove the uniqueness of the Grassmann tensor corresponding to each set of image points, a question that remained open in the work of Hartley and Schaffalitzky. Then, we show that projective equivalence follows from the set of projective equations, provided that the depths are all nonzero. Finally, we classify possible wrong solutions to the projective factorization problem, where not all the projective depths are restricted to be nonzero. We test our theory experimentally by running the factorization based algorithms for rigid structure and motion in the case of 3D to 2D projections. We further run simulations for projections from higher dimensions. In each case, we present examples demonstrating how the algorithm can converge to the degenerate solutions introduced in the earlier chapters. We also show how the use of proper constraints can result in a better performance in terms of finding a correct solution.
Letter from James Goldie to J.E. [John Edgar] McAllister and R.S. [Robert Stanhope] Dormer, April 22, 1931
Creators: name: Goldie, James
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to Robert Stanhope Dormer and J.E. McAllister from James Goldie, dated April 22, 1931, regarding the Ranche's orchard business; includes a statement of comparative expenditure for 1928-1930.
Characterisation of slip and twin activity using digital image correlation and crystal plasticity finite element simulation: Application to orthorhombic $α$-uranium
Creators: name: Grilli, Nicolò
name: Earp, Philip
name: Cocks, Alan C. F.
name: Marrow, James
name: Tarleton, Edmund
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Calibrating and verifying crystal plasticity material models is a significant challenge, particularly for materials with a number of potential slip and twin systems. Here we use digital image correlation on coarse-grained $α$-uranium during tensile testing in conjunction with crystal plasticity finite element simulations. This approach allows us to determine the critical resolved shear stress, and hardening rate of the different slip and twin systems. The constitutive model is based on dislocation densities as state variables and the simulated geometry is constructed from electron backscatter diffraction images that provide shape, size and orientation of the grains, allowing a direct comparison between virtual and real experiments. An optimisation algorithm is used to find the model parameters that reproduce the evolution of the average strain in each grain as the load is increased. A tensile bar, containing four grains aligned with the load direction, is used to calibrate the model with eight unknown parameters. The approach is then independently validated by simulating the strain distribution in a second tensile bar. Different mechanisms for the hardening of the twin systems are evaluated. The latent hardening of the most active twin system turns out to be determined by coplanar twins and slip. The hardening rate of the most active slip system is lower than in fine-grained $α$-uranium. The method developed in the present research can be applied to identify the critical resolved shear stress and hardening parameters of other coarse-grained materials.
Intense AGN activity in the merging cluster Cygnus A
Creators: name: Majumder, Anwesh
name: Wise, Michael
name: Simionescu, Aurora
name: de Vries, Martijn
Publisher: name: Zenodo
Year: 2022
Subjects: X-rays: galaxies: clusters
Galaxies: clusters: intracluster medium
Galaxies: clusters: individual: Cygnus A

description: We report on a detailed spatial and spectral analysis of the large-scale X-ray emission from the merging cluster Cygnus A. We use 2.2 Msec Chandra and 40 ksec XMM-Newton archival datasets to map the thermodynamic properties of the intracluster gas in the merger region between the two sub-clusters in the system. These maps exhibit complex intracluster medium (ICM) structure and temperature fluctuations that imply significant heating along the merger axis. Possible sources for this heating could include the shock from the ongoing merger, past activity of the powerful AGN in the core, or a combination of both. To distinguish between these scenarios, we compare the observed X-ray properties of Cygnus A with simple, spherical cluster models to quantify the morphology and amount of heating in the merger region. The spherical models for the two sub-clusters are constructed using azimuthally averaged density and temperature profiles determined from the data neglecting the merger region. These models for the “undisturbed" sub-clusters were then folded through the MARX instrument simulators to produce realistic mock Chandra observations. The thermodynamic properties in the merger region from these mock X-ray observations were used as a baseline for comparison with the actual observations. This analysis identifies two components in the heated ICM, a series of 3-4 keV temperature peaks presumably associated with past episodic AGN activity, and a smooth, large-scale temperature excess attributed to the ongoing merger. These features are also seen in the XMM data. If attributable to the central AGN, the location and strength of these features imply that Cygnus A has been active for the past 400 Myr injecting a total of 10^60 erg into the merger region. This value corresponds to ~30% of the energy deposited in the same region by the merger shock. We conclude that the contribution due to AGN outbursts can be a significant fraction of the total energy deposited in the ICM over a cluster’s lifetime.
Analytical Inverse For The Symmetric Circulant Tridiagonal Matrix
Creators: name: Sarayi, Seyyed Mostafa Mousavi Janbeh
name: Tavana, Saman
name: Karimpour, Morad
name: Bahrami, Mansour Nikkhah
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Finding the inverse of a matrix is an open problem especially when it comes to engineering problems due to their complexity and running time (cost) of matrix inversion algorithms. An optimum strategy to invert a matrix is, first, to reduce the matrix to a simple form, only then beginning a mathematical procedure. For symmetric matrices, the preferred simple form is tridiagonal. This makes tridiagonal matrices of high interest in applied mathematics and engineering problems. This study presents a time efficient, exact analytical approach for finding the inverse, decomposition, and solving linear systems of equations where symmetric circulant matrix appears. This matrix appears in many researches and it is different from ordinary tridiagonal matrices as there are two corner elements. For finding the inverse matrix, a set of matrices are introduced that any symmetric circulant matrix could be decomposed into them. After that, the exact analytical inverse of this set is found which gives the inverse of circulant matrix. Moreover, solving linear equations can be carried out using implemented decomposition where this matrix appears as a coefficient matrix. The methods principal strength is that it is as stable as any other direct methods (i.e., execute in a predictable number of operations). It is straightforward, understandable, solid as a rock and an exceptionally good psychological backup for those times when something is going wrong and you think it might be your linear equation solver. The downside of present method, and every other direct method, is the accumulation of round off errors.