cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Anomalous propagations of electromagnetic waves in anisotropic media with a unique dispersion relation
Creators: name: Shu, Weixing
name: Luo, Hailu
name: Li, Fei
name: Ren, Zhongzhou
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We investigate the reflection and refraction behaviors of electromagnetic waves at the interface between an isotropic material and the anisotropic medium with a unique dispersion relation. We show that the refraction angle of whether phase or energy flow for $E$-polarized waves is opposite to that for $H$-polarized waves, though the dispersion relations for $E$- and $H$-polarized waves are the same in such anisotropic media. For a certain polarized wave the refraction behaviors of wave vector and energy flow are also significantly different. It is found that waves exhibit different propagation behaviors in anisotropic media with different sign combinations of the permittivity and permeability tensors. Some interesting properties of propagation are also found in the special anisotropic media, such as amphoteric refraction, oblique total transmission for both $E$- and $H$-polarized waves, and the inversion of critical angle. The special anisotropic media can be realized by metamaterials and lead to potential applications, such as to fabricate polarization splitters with higher efficiencies than conventional counterparts.
description: 17 pages, 5 figures
A. MAGNETTO - D. ERDAS - C. CARUSI (a cura di), Nuove ricerche sulla legge granaria ateniese del 374/3, 2010
Creators: name: Valente, Marcello
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2012

description: Recensione

A. Magnetto - D. Erdas - C. Carusi (a cura di), Nuove ricerche sulla legge granaria ateniese del 374/3, Edizioni ETS, Pisa 2010, ISBN 9788846728265.
description: HISTORIKA Studi di storia greca e romana, Vol 1, N° 2 (2011)
Moral ambiguity: an ethical examination of its constituents, effects and interventions.
Creators: name: Nagpal, Mahak
Publisher: name: No Publisher Supplied
Year: 2021

description: We are living in an era defined by ethical transgressions. Since these transgressions have come to affect those across various walks of life, there has been a public outcry to examine the precursors and combatants of such behavior. The presence of ethical gray areas is one of the most oft cited reasons for why these ethical transgressions occur. This dissertation seeks not only to examine individual differences in terms of how organizational members respond to these gray areas, but also to examine any organizational interventions that could help address the individual states that result from the presence of these gray areas, from an ethical perspective.For this purpose, the first paper in my dissertation, titled, “Building an Understanding of Moral Ambiguity,” introduces the construct of ‘Moral Ambiguity.’ Specifically, in this paper, I examine the factors that encompass moral ambiguity, namely the extent to which one recognizes the moral principles at stake, as well as one’s sense of certainty surrounding the ethical outcomes associated with the quandary-causing options at hand. I go on to break down the experience of being presented with a moral dilemma in terms of one’s perception of the moral principles at play as well as one’s understanding of the moral outcomes associated with one’s actions. In doing so, I demonstrate the importance of introducing greater nuance into moral dilemma research.Following the presentation of a conceptualization of moral ambiguity, the first set of empirical studies in this dissertation titled, “The relationship between moral ambiguity and ethical behavior,” seek to empirically validate the constituents of and understand the ethical implications of moral ambiguity. This leads into an examination of the components of the normative structure of an organization, namely organizational rules, that could be used as an intervention in combatting moral ambiguity. Read together, the contents of this dissertation shed light not only upon the determinants of and outcomes associated with moral ambiguity, but also on how components of the organizational structure, namely, organizational rules, can be used to alleviate employee unethical behaviors that result due to the various forms of moral ambiguity.
Sydr: Cutting Edge Dynamic Symbolic Execution
Creators: name: Vishnyakov, Alexey
name: Fedotov, Andrey
name: Kuts, Daniil
name: Novikov, Alexander
name: Parygina, Darya
name: Kobrin, Eli
name: Logunova, Vlada
name: Belecky, Pavel
name: Kurmangaleev, Shamil
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The security development lifecycle (SDL) is becoming an industry standard. Dynamic symbolic execution (DSE) has enormous amount of applications in computer security (fuzzing, vulnerability discovery, reverse-engineering, etc.). We propose several performance and accuracy improvements for dynamic symbolic execution. Skipping non-symbolic instructions allows to build a path predicate 1.2--3.5 times faster. Symbolic engine simplifies formulas during symbolic execution. Path predicate slicing eliminates irrelevant conjuncts from solver queries. We handle each jump table (switch statement) as multiple branches and describe the method for symbolic execution of multi-threaded programs. The proposed solutions were implemented in Sydr tool. Sydr performs inversion of branches in path predicate. Sydr combines DynamoRIO dynamic binary instrumentation tool with Triton symbolic engine. We evaluated Sydr features on 64-bit Linux executables.
description: 9 pages
Citrus Research in Umtata
Creators: name: Adebola Oyedeji
name: Kantore, Adelin
Publisher: name: Walter Sisulu University
Year: 2021
Subjects: subject: 60101 Analytical Biochemistry
subject: FOS: Biological sciences

description: Abstract: Comparative chemical composition of the essential oils of wild and cultivated P. inquinans fresh leaves and stem was determined and the oils were evaluated for their anti-inflammatory, analgesic and cytotoxicity (acute oral toxicity profile) properties. Fresh leaves and stem of wild and cultivated P. inquinans were hydrodistilled using Clevenger apparatus. The chemical composition of the essential oils obtained from the wild and cultivated was determined using gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. The four oils were evaluated for analgesic activities using acetic acidinduced writhings on hot plate nociception models in mice; while their anti-inflammatory effect was determined using the egg albumin-induced rat paw oedema method in rats. Cytotoxicity test was done using Lorke’s method on mice. Camphor (46.5 %), phytol (14.2 % - 20.5 %), α-caryophyllene (17.2 % - 25.8 %), β-caryophyllene (1.7 % -25.2 %), sabinene (27.8 %), linalool (15.3 %) and α-terpineol (8.7 %) were the major components of wild and cultivated P. inquinans. The leaf and stem oils from the wild and cultivated plants displayed LD50 > 5000 mg/kg, indicating they are non-toxic orally. The oils also showed significant (p<0.05-0.001) decrease in number of writhes induced by the acetic acid compared to vehicle, and also caused significant (p<0.05-0.001) delay in reaction time on the hot plate at 60 and 90 min post-treatment and significantly (p<0.05 and 0.001) reduced oedema size caused by the egg albumin injection compared to the vehicle. The oils from the wild plant source however showed more potency when compared to the cultivated. The wild and cultivated P. inquinans leaf and stem essential oils displayed significant but comparable analgesic and anti-inflammatory activities in rodents
S. HORNBLOWER, Thucydidean Themes, 2011
Creators: name: Cuniberti, Gianluca
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2012

description: Recensione

S. Hornblower, Thucydidean Themes, Oxford University Press, Oxford-New York 2011, 415 pp., ISBN 9780199562336.
description: HISTORIKA Studi di storia greca e romana, Vol 1, N° 2 (2011)
Controlling Molecular Motion
Creators: name: Macdonald, Thomas
Publisher: name: figshare
Year: 2021
Subjects: subject: Supramolecular Chemistry
subject: 30505 Physical Organic Chemistry
subject: FOS: Chemical sciences
subject: NMR Spectroscopy
subject: 30302 Nanochemistry and Supramolecular Chemistry

description: This thesis explores spatial control over chemical processes. The goal was to influence the diffusion of small molecules in solution, which could lead towards control over spatial distributions and the ability to create concentration gradients. The primary tool used to investigate this behaviour was diffusion NMR spectroscopy. It is widely recognised that major advances in chemistry arrive as a result of new tools, and here the development and application of new tools to measure diffusion is conducted in parallel.
Chapter 2 describes the development of new techniques for acquiring and processing time-resolved diffusion NMR data with high time resolution. These methods are used repeatedly throughout this work to follow chemical processes through time-dependent changes in diffusion coefficients. This chapter also presents a new temperature-independent method of gradient calibration using methanol, simplifying the process of obtaining calibrated absolute measurements of diffusion by NMR spectroscopy.
Chapter 3 investigates the controversial phenomenon of `enhanced diffusion' of active catalysts as a means towards driving translational motion at the molecular scale. Using two model reactions, key results from the literature are reproduced experimentally but found to be caused by convection, not enhanced diffusion as had been reported. These results have wider implications for ongoing research into enhanced diffusion.
Chapter 4 describes a different approach towards influencing the diffusion rates of small molecules by combining photoswitchable anion binding with antielectrostatic self-assembly of phosphate anions in solution. Contrary to the chemical intuition that like charges repel, the dihydrogen phosphate anion is found to self-associate to a remarkable extent in a polar solvent. These surprising findings reveal the complex solution state self-association of a common anion., and the polyanionic phosphate clusters formed in solution allow much greater control over the diffusive properties of the photoswitchable host than could be achieved otherwise.
Chapter 5 contains a proposal for an all-photonic photoswitchable fluorescence feedback system that could amplify information and return an output as blue or green light. A theoretical model of this system is presented based on known molecular properties, and numerical modelling is used to illustrate the bifurcating and bistable dynamics of the proposed system. Preliminary experimental work on this topic is also presented.
title:  L’uomo e il cavolfiore. Da Sartre a Deleuze, dall’umano al postumano
Creators: name: Cimatti  ,  Felice
Publisher: name: Roma TrE-Press
Year: 2019

description: A quali condizioni l’umanesimo può trasformarsi in post-umanesimo? In questo saggio cerchiamo di argomentare a favore di un’ontologia in cui la dif-ferenza tra un essere umano e un cavolfiore, cioè quella del dualismo soggetto-oggetto, collassa su se stessa. Per Sartre il cavolfiore rappresenta l’opposto dell’essere umano. Cercheremo pertanto di sostenere che in realtà anche nell’esistenzialismo di Sartre si può trovare un possibile movimento verso il post-umano. Un movimento che di fatto Sartre non intraprende, ma che tuttavia è potenzialmente implicito nell’Esistenzialismo è un umanesimo.
description: Studi Sartriani – Anno XIII – L’umana disumanità
LIN FOXHALL - HANS-JOACHIM GEHRKE - NINO LURAGHI  (ed.), Intentional History: Spinning Time in Ancient Greece, 2010
Creators: name: Cuniberti, Gianluca
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2012

description: Lin Foxhall - Hans-Joachim Gehrke - Nino Luraghi (ed.), Intentional History: Spinning Time in Ancient Greece, Franz Steiner Verlag, Stuttgart 2010, 360 pp., ISBN 9783515096836.
description: HISTORIKA Studi di storia greca e romana, Vol 1, N° 2 (2011)
title: Assessing the implementation progress of adaptation to climate change
Creators: name: Leiter, Timo L.
Publisher: name: London School of Economics and Political Science (LSE)
Year: 2026

description: 2023 is set to be the warmest year on record.1 Extreme weather events are getting more severe and more frequent, making adaptation to climate change ever more important. Literature on climate adaptation has strongly increased in quantitative output, but only a fraction of it focuses on actual implementation and its effects. Little empirical evidence is available on whether we are adapting. This knowledge gap has been referred to as a ‘grand challenge’ of adaptation research (Berrang-Ford et al., 2019). To improve our understanding of global progress on adaptation, this thesis includes novel empirical accounts of the United Nations (UN) climate change negotiations through multi-year participant observation, examining the rule-setting process for disclosure of adaptation information and the decisions taken on climate adaptation since the adoption of the Paris Agreement in 2015. This thesis also examines whether countries are tracking the implementation of their National Adaptation Plans (NAPs) and to what extent adaptation projects are implemented by the multilateral funds under the UN Framework Convention on Climate Change (UNFCCC), namely the Adaptation Fund, the Global Environment Facility, and the Green Climate Fund. These evidence-based accounts are contrasted to assessments based on countries’ stated intentions which are shown to overestimate progress by up to a factor of four. This thesis also includes contributions to two global environmental assessments, the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) and the Adaptation Gap Report of the UN Environment Programme (UNEP). Its findings are highly policy relevant including in the context of the Global Goal on Adaptation and its framework. This thesis produced novel findings and generated two new datasets including an inventory of over 100 policy documents in more than ten languages. It makes significant contributions to the ’grand challenge' of better understanding global progress on adaptation.
Unconventional scaling at non-Hermitian critical points
Creators: name: Arouca, R.
name: Lee, C. H.
name: Smith, C. Morais
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Critical phase transitions contain a variety of deep and universal physics, and are intimately tied to thermodynamic quantities through scaling relations. Yet, these notions are challenged in the context of non-Hermiticity, where spatial or temporal divergences render the thermodynamic limit ill-defined. In this work, we show that a thermodynamic grand potential can still be defined in pseudo-Hermitian Hamiltonians, and can be used to characterize aspects of criticality unique to non-Hermitian systems. Using the non-Hermitian Su-Schrieffer-Heeger (SSH) model as a paradigmatic example, we demonstrate the fractional order of topological phase transitions in the complex energy plane. These fractional orders add up to the integer order expected of a Hermitian phase transition when the model is doubled and Hermitianized. More spectacularly, gap preserving highly degenerate critical points known as non-Bloch band collapses possess fractional order that are not constrained by conventional scaling relations, testimony to the emergent extra length scale from the skin mode accumulation. Our work showcases that a thermodynamic approach can prove fruitful in revealing unconventional properties of non-Hermitian critical points.
description: 19 pages (14 pages of text+ 5 pages of appendices and references), 13 figures. Minor modifications added in the second version
Text: Autobiography
Creators: name: Narvaez, Erika
name: Dabkowski, Maksymilian
name: Aguinda, Shen
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: con

description: Her grandparents lived in La Sofía. Where she learned to speak A'ingae, where she studied, how they managed to use solar energy for the community.
La Tabula Peutingeriana, Boccaccio e due etnici antichi delle Alpi occidentali
Creators: name: Rubat Borel, Francesco
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2013
Subjects: Tabula Peutingeriana; Boccaccio; Alpi occidentali; etnonimi; Nantuani; Naburni

description: La ricorrenza identica di due etnonimi relativi alle Alpi occidentali (Nantuani e Naburni, non altrimenti attestati in questa forma) nella Tabula Peutingeriana e nel De fluminibus di Boccaccio getta nuova luce sulla storia della tradizione della Peutingeriana nel tardo medioevo.

The Tabula Peutingeriana and Boccaccio’s De Fluminibus are the only sources attesting in the same form two ethnonyms relating to Western Alps (Nantuani and Naburni): this gives new information on Peutingeriana tradition in the late Middle Ages.
description: HISTORIKA Studi di storia greca e romana, Vol 2 (2012)
On the complex X-ray structure tracing the motion of Geminga
Creators: name: De Luca, A.
name: Caraveo, P. A.
name: Mattana, F.
name: Pellizzoni, A.
name: Bignami, G. F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A deep (100 ks) XMM-Newton observation of Geminga has shown two faint tails of diffuse X-ray emission, extending for ~2' behind the pulsar, well aligned with the proper motion (PM) direction. We report here on a recent ~20 ks Chandra observation, which unveils a new structure, ~25'' long and ~5'' thick, starting at the pulsar position and perfectly aligned with the PM direction, with a surface brightness ~40 times higher than that of the XMM Tails. The Chandra comet-like feature has a remarkably hard spectrum (photon index 0.9-1.4) and a luminosity of ~5.5x10^28 erg s^-1, comparable to the energetics of the larger XMM one. Geminga is thus the first neutron star to show a clear X-ray evidence of a large-scale, outer bow-shock as well as a short, inner cometary trail.
description: 5 pages, accepted for publication in A&A Letters
Strong gravitational lensing by Kerr and Kerr-Newman black holes
Creators: name: Hsieh, Tien
name: Lee, Da-Shin
name: Lin, Chi-Yong
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the strong gravitational lensing due to the Kerr black holes with angular momentum $a$ and the Kerr-Newman black holes with additional charge $Q$. We first derive the analytical expressions of the deflection angles of light rays that particularly diverge as they travel near the photon sphere. In this strong deflection limit, the light rays can circle around the black hole multiple times before reaching the observer, giving relativistic images. The obtained analytical expressions are then applied to compute the angular positions and the magnifications of relativistic images due to the supermassive galactic black holes. In this work, we focus on the outermost image with reference to the optical axis. We find that its angular separation from the one closest to the optical axis and the magnification increase in angular momentum $a$ of the black holes for light rays with direct orbits. Additionally, the effects of the charge $Q$ of black holes also increase the angular separation of the outermost image from the others and the magnification for both direct and retrograde orbits. The potentially increasing observability of the relativistic images from the effects of angular momentum and charge of the black holes will be discussed.
description: 27 pages, 6 figures
Nonlinear Modeling Approach to Human Promoter Sequences
Creators: name: Yang, Huijie
name: Zhao, Fangcui
name: Gu, Jianzhong
name: Wang, Binghong
Publisher: name: arXiv
Year: 2005
Subjects: subject: Genomics (q-bio.GN)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: By means of the nonlinear modeling technique (NM technique), we find the nonlinear deterministic structures in the promoter regions (PPRs) of DNA sequences, called deterministic valleys (DVs) in this paper. These DVs prefer to occur much more outside of a special region around TSS. The number, positions and shapes of the DVs are basically different for different PPRs. Generally, these DVs do not occur in the CpG islands, which tells us that they should be special structures with new biological functions rather than the CpG islands. PACS numbers: 87.14.Gg, 87.10.1e, 05.45.2a
description: 23 pages, 9figures, 1 table, To appear in Jorunal of Theoretical Physics
Morphology, histology and histochemistry of the digestive tract of the Banded tilapia, Tilapia sparrmanii (Perciformes: Cichlidae)
Creators: name: Okuthe, Grace Emily
name: Bongile Bhomela
Publisher: name: Walter Sisulu University
Year: 2021
Subjects: subject: Zoology
subject: FOS: Biological sciences

description: This study described anatomical, histological and histochemical features of the mucosal layer of the digestive tract of Tilapia sparrmanii Smith, 1840, an omnivorous freshwater fish endemic to Southern Africa. This species exhibited a short thick oesophagus with long deep longitudinal folds (466.68 ± 16.91 µm), and a thick (173.50 ± 10.92 µm) muscular layer that allow the passage of large food items. The mucosa was lined with stratified secretory epithelium rich in goblet cells that secreted neutral and acid mucins. The stomach was a sac-like structure with simple tubular glands surrounded by connective tissue. The mucosa was lined with simple columnar epithelium and the lamina propria exhibited a well-developed layer of gastric glands that occupied the entire length of the cardio-fundic region. The stomach mucosa consisted of epithelial cells with intense neutral mucin secretion which protects against gastric juice. Neck cells of gastric glands synthesized neutral and acid mucins. The intestine was highly coiled and presented a complex pattern of transversal folds internally (villi). Villi length decreased progressively from the anterior to the posterior intestine (p < 0.0001). Tunica muscularis of the mid-intestine had the thinnest thickness among all parts of the intestine (p < 0.0001). Goblet cells whose numbers increased towards the rectum secreted both acid and neutral mucins. The results indicate structural similarities of T. sparrmanii GIT with other tilapia species and will be useful for understanding the physiology of the digestive systems as well as functional components of the GIT.
Mechanical effects of optical resonators on driven trapped atoms: Ground state cooling in a high finesse cavity
Creators: name: Zippilli, Stefano
name: Morigi, Giovanna
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate theoretically the mechanical effects of light on atoms trapped by an external potential, whose dipole transition couples to the mode of an optical resonator and is driven by a laser. We derive an analytical expression for the quantum center-of-mass dynamics, which is valid in presence of a tight external potential. This equation has broad validity and allows for a transparent interpretation of the individual scattering processes leading to cooling. We show that the dynamics are a competition of the mechanical effects of the cavity and of the laser photons, which may mutually interfere. We focus onto the good-cavity limit and identify novel cooling schemes, which are based on quantum interference effects and lead to efficient ground state cooling in experimentally accessible parameter regimes.
description: 17 pages, 6 figures
I Trumplini fra Camuni, Reti e Celti: alcune note sulle fonti storiche e i dati archeologici fra età del Ferro e romanizzazione
Creators: name: Solano, Serena
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2013
Subjects: Trumplini; the second Iron Age; cultural facies; Romanization

description: I Trumplini sono citati da numerose fonti storiografiche e epigrafiche antiche: presenti fra le gentes alpinae devictae nel Trofeo di La Turbie e fra i popoli effigiati nel Sebasteion di Afrodisia di Caria, essi sono nominati distintamente rispetto a Camuni, Sabini e Reti. I dati archeologici dalla Val Trompia, per quanto scarsi e frammentari e non indicativi di una specifica identità etnica, testimoniano per il territorio l’apertura fin dal III sec. a.C. verso il mondo celtico e l’esistenza di stretti rapporti culturali ed economici con la pianura e con Brescia.

The Trumplini are mentioned by numerous ancient historical and epigraphic sources: present among the gentes alpinae devictae Trophy in La Turbie and among peoples portrayed in Sebasteion of Aphrodisias in Caria, they are cited distinctly from the Camunni, Sabini and Raeti. The archaeological data from Valtrompia, though insufficient and not specific to an ethnic identity, testifies an opening to the Celtic world since the third century B.C. and the existence of close cultural and economic ties with Brescia and the plains.
description: HISTORIKA Studi di storia greca e romana, Vol 2 (2012)
Note a CIL V, 5136: indicatori epigrafici ed evidenze archeologiche di una microstoria di integrazione locale ed evergetismo architettonico
Creators: name: Tomasi, Paola
Publisher: name: Università degli Studi di Torino - Dipartimento di Studi Storici
Year: 2013
Subjects: Romanisation; Transpadana; CIL, V 5136; baths; aqueducts; bathing facilities; Bergomum; balneum; aqua; thermae; evergetism; water

description: CIL, V 5136 da Bergomum costituisce un'interessante testimonianza dell'evergetismo architettonico-termale in area transpadana. L'iscrizione evidenzia  la concezione di un evergetismo privato improntato a criteri di pubblica utilità e prova il valore dell'epigrafia come strumento di riconoscimento sociale e di perpetuazione del ricordo dell'individuo. La recente ripresa (Aprile 2012) delle esplorazioni archeologiche ha localizzato l'ubicazione vicino al foro dei resti relativi agli apprestamenti idrici ricordati dall'epigrafe.
CIL, V 5136, an inscription from Bergomum, provides clear evidence on the water-related evergetism in Transpadana, highlighting the pivotal role of inscribed texts in self-advertisment and social distinction in ancient communities.The bathing facilities mentioned in the epigraphic record have been successfully matched with the archaeological remains unearthed near the ancient forum, whose location has been recently (April 2012) confirmed.
description: HISTORIKA Studi di storia greca e romana, Vol 2 (2012)
Cosmography with cluster strong lensing
Creators: name: Gilmore, James
name: Natarajan, Priyamvada
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: By stacking an ensemble of strong lensing clusters, we demonstrate the feasibility of placing constraints on the dark energy equation of state. This is achieved by using multiple images of sources at two or more distinct redshift planes. The sample of smooth clusters in our simulations is based on observations of massive clusters and the distribution of background galaxies is constructed using the Hubble Deep Field. Our source distribution reproduces the observed redshift distribution of multiply imaged sources in Abell 1689. The cosmology recovery depends on the number of image families with known spectroscopic redshifts and the number of stacked clusters. Our simulations suggest that constraints comparable to those derived from other competing established techniques on a constant dark energy equation of state can be obtained using 10 to 40 clusters with 5 or more families of multiple images. We have also studied the observational errors in the image redshifts and positions. We find that spectroscopic redshifts and high resolution {\it Hubble Space Telescope} images are required to eliminate confidence contour relaxation relative to the ideal case in our simulations. This suggests that the dark energy equation of state, and other cosmological parameters, can be constrained with existing {\it Hubble Space Telescope} images of lensing clusters coupled with dedicated ground-based arc spectroscopy.
description: MNRAS in press, 13 pages, 5 figures
Effect of phase string on single-hole dynamics in the two-leg Hubbard ladder
Creators: name: Shinjo, Kazuya
name: Sota, Shigetoshi
name: Tohyama, Takami
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Optical measurements in doped Mott insulators have discovered the emergence of spectral weights at mid-infrared (MIR) upon chemical doping and photodoping. MIR weights may have a relation to string-type excitation of spins, which is induced by a doped hole generating misarranged spins with respect to their sublattice. There are two types of string effects: one is an $S^z$ string that is repairable by quantum spin flips and the other is a phase string irreparable by the spin flips. We investigate the effect of $S^{z}$ and phase strings on MIR weights. Calculating the optical conductivity of the single-hole Hubbard model in the strong-coupling regime and the $t$-$J$ model on two-leg ladders by using time-dependent Lanczos and density-matrix renormalization group, we find that phase strings make a crucial effect on the emergence of MIR weights as compared with $S^{z}$ strings. Our findings indicate that a mutual Chern-Simons gauge field acting between spin and charge degrees of freedom, which is the origin of phase strings, is significant for obtaining MIR weights. Conversely, if we remove this gauge field, no phase is picked up by a doped hole. As a result, a spin-polaron accompanied by a local spin distortion emerges and a quasiparticle with a cosine-like energy dispersion is formed in single-particle spectral function. Furthermore, we suggest a Floquet engineering to examine the phase-string effect in cold atoms.
description: 14 pages, 9 figures
On the classification of finite-dimensional pointed Hopf algebras
Creators: name: Andruskiewitsch, N.
name: Schneider, H. -J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 17B37, 16W30

description: We classify finite-dimensional complex Hopf algebras $A$ which are pointed, that is, all of whose irreducible comodules are one-dimensional, and whose group of group-like elements $G(A)$ is abelian such that all prime divisors of the order of $G(A)$ are $>7$. Since these Hopf algebras turn out to be deformations of a natural class of generalized small quantum groups, our result can be read as an axiomatic description of generalized small quantum groups.
description: 38 pages. The determination of all isomorphisms between the Hopf algebras presented here is given. The title is changed. Third version: several improvements on the exposition mainly following suggestions of the referee
Probing the nuclear equation of state from the existence of a $\sim 2.6~M_{\odot}$ neutron star: the GW190814 puzzle
Creators: name: Kanakis-Pegios, A.
name: Koliogiannis, P. S.
name: Moustakidis, Ch. C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: On August 14, 2019, the LIGO/Virgo collaboration observed a compact object with mass $\sim 2.59_{-0.09}^{+0.08}~M_{\odot}$, as a component of a system where the main companion was a black hole with mass $\sim 23~M_{\odot}$. A scientific debate initiated concerning the identification of the low mass component, as it falls into the neutron star - black hole mass gap. The understanding of the nature of GW190814 event will offer rich information concerning open issues, the speed of sound and the possible phase transition into other degrees of freedom. In the present work, we made an effort to probe the nuclear equation of state along with the GW190814 event. Firstly, we examine possible constraints on the nuclear equation of state inferred from the consideration that the low mass companion is a slow or rapidly rotating neutron star. In this case, the role of the upper bounds on the speed of sound is revealed, in connection with the dense nuclear matter properties. Secondly, we systematically study the tidal deformability of a possible high mass candidate existing as an individual star or as a component one in a binary neutron star system. As the tidal deformability and radius are quantities very sensitive on the neutron star equation of state, they are excellent counters on dense matter properties. We conjecture that similar isolated neutron stars or systems may exist in the Universe and their possible future observation will shed light on the maximum neutron star mass problem.
description: v1: 18 pages, 8 figures, 2 tables. v2: 23 pages, 9 figures, 3 tables; accepted for publication in Symmetry
First application of machine learning algorithms to the position reconstruction in Resistive Silicon Detectors
Creators: name: Siviero, Federico
name: Arcidiacono, Roberta
name: Cartiglia, Nicolò
name: Costa, Marco
name: Ferrero, Marco
name: Mandurrino, Marco
name: Sola, Valentina
name: Staiano, Amedeo
name: Tornago, Marta
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: RSDs (Resistive AC-Coupled Silicon Detectors) are n-in-p silicon sensors based on the LGAD (Low-Gain Avalanche Diode) technology, featuring a continuous gain layer over the whole sensor area. The truly innovative feature of these sensors is that the signal induced by an ionising particle is seen on several pixels, allowing the use of reconstruction techniques that combine the information from many read-out channels. In this contribution, the first application of a machine learning technique to RSD devices is presented. The spatial resolution of this technique is compared to that obtained with the standard RSD reconstruction methods that use analytical descriptions of the signal sharing mechanism. A Multi-Output regressor algorithm, trained with a combination of simulated and real data, leads to a spatial resolution of less than 2 $μm$ for a sensor with a 100 $μm$ pixel. The prospects of future improvements are also discussed.
Exactly solvable spin-1/2 XYZ models with highly-degenerate, partially ordered, ground states
Creators: name: Palle, Grgur
name: Benton, Owen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Exactly solvable models play a special role in Condensed Matter physics, serving as secure theoretical starting points for investigation of new phenomena. Changlani et al. [Phys. Rev. Lett. 120, 117202 (2018)] have discovered a limit of the XXZ model for $S=1/2$ spins on the kagome lattice, which is not only exactly solvable, but features a huge degeneracy of exact ground states corresponding to solutions of a three-coloring problem. This special point of the model was proposed as a parent for multiple phases in the wider phase diagram, including quantum spin liquids. Here, we show that the construction of Changlani et al. can be extended to more general forms of anisotropic exchange interaction, finding a line of parameter space in an XYZ model which maintains both the macroscopic degeneracy and the three-coloring structure of solutions. We show that the ground states along this line are partially ordered, in the sense that infinite-range correlations of some spin components coexist with a macroscopic number of undetermined degrees of freedom. We therefore propose the exactly solvable limit of the XYZ model on corner-sharing triangle-based lattices as a tractable starting point for discovery of quantum spin systems which mix ordered and spin liquid-like properties.
description: Supplemental material, including animations, available with journal version
Obstacle Avoidance Using a Monocular Camera
Creators: name: Hatch, Kyle
name: Mern, John
name: Kochenderfer, Mykel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.10; I.2.9

description: A collision avoidance system based on simple digital cameras would help enable the safe integration of small UAVs into crowded, low-altitude environments. In this work, we present an obstacle avoidance system for small UAVs that uses a monocular camera with a hybrid neural network and path planner controller. The system is comprised of a vision network for estimating depth from camera images, a high-level control network, a collision prediction network, and a contingency policy. This system is evaluated on a simulated UAV navigating an obstacle course in a constrained flight pattern. Results show the proposed system achieves low collision rates while maintaining operationally relevant flight speeds.
description: AIAA SciTech Forum 2021 pre-print
Molecular Detection of Antibiotic-Resistant Genes in Pseudomonas aeruginosa from Nonclinical Environment: Public Health Implications in Mthatha, Eastern Cape Province, South Africa
Creators: name: Mojisola Clara Hosu
name: Vasaikar, Sandeep
name: Okuthe, Grace Emily
name: Teke Apalata
Publisher: name: Walter Sisulu University
Year: 2021
Subjects: subject: Microbiology
subject: FOS: Biological sciences

description: Evaluation of resistant profiles and detection of antimicrobial-resistant genes of bacterial pathogens in the nonclinical milieu is imperative to assess the probable risk of dissemination of resistant genes in the environment. .is paper sought to identify antibiotic-resistant genes in Pseudomonas aeruginosa from nonclinical sources in Mthatha, Eastern Cape, and evaluate its public health implications. Samples collected from abattoir wastewater and aquatic environment were processed by membrane filtration and cultured on CHROMagarTM Pseudomonas medium. Species identification was performed by autoSCAN-4 (Dade Behring Inc., IL). Molecular characterization of the isolates was confirmed using real-time polymerase chain reaction (rPCR) and selected isolates were further screened for the possibility of harboring antimicrobial resistance genes. Fifty-one Pseudomonas species were recovered from abattoir wastewater and surface water samples, out of which thirty-six strains were Pseudomonas aeruginosa (70.6%). .e P. aeruginosa isolates demonstrated resistance to aztreonam (86.1%), ceftazidime (63.9%), piperacillin (58.3%), cefepime (55.6%), imipenem (50%), piperacillin/tazobactam (47.2%), meropenem (41.7%), and levofloxacin (30.6%). Twenty out of thirty-six P. aeruginosa displayed multidrug resistance profiles and were classified as multidrug-resistant (MDR) (55.6%). Most of the bacterial isolates exhibited a high Multiple Antibiotic Resistance (MAR) Index ranging from 0.08 to 0.69 with a mean MAR index of 0.38. In the rPCR analysis of fifteen P. aeruginosa isolates, 14 isolates (93.3%) were detected harboring blaSHV, six isolates (40%) harbored blaTEM, and three isolates (20%) harbored blaCTX-M, being the least occurring ESBL. Results of the current study revealed that P. aeruginosa isolates recovered from nonclinical milieu are resistant to frontline clinically relevant antipseudomonal drugs. .is is concerning as it poses a risk to the environment and constitutes a public health threat. Given the public health relevance, the paper recommends monitoring of multidrug-resistant pathogens in effluent environments.
Implications of recoil kicks for black hole mergers from LIGO/Virgo catalogs
Creators: name: Fragione, Giacomo
name: Loeb, Abraham
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The first and second Gravitational Wave Transient Catalogs by the LIGO/Virgo Collaboration include $50$ confirmed merger events from the first, second, and first half of the third observational runs. We compute the distribution of recoil kicks imparted to the merger remnants and estimate their retention probability within various astrophysical environments as a function of the maximum progenitor spin ($χ_{\rm max}$), assuming that the LIGO/Virgo binary black hole (BBH) mergers were catalyzed by dynamical assembly in a dense star cluster. We find that the distributions of average recoil kicks are peaked at about $150$ km s$^{-1}$, $250$ km s$^{-1}$, $350$ km s$^{-1}$, $600$ km s$^{-1}$, for maximum progenitor spins of $0.1$, $0.3$, $0.5$, $0.8$, respectively. Only environments with escape speed $\gtrsim 100$ km s$^{-1}$, as found in galactic nuclear star clusters as well as in the most massive globular clusters and super star clusters, could efficiently retain the merger remnants of the LIGO/Virgo BBH population even for low progenitor spins ($χ_{\rm max}=0.1$). In the case of high progenitor spins ($χ_{\rm max}\gtrsim 0.5$), only the most massive nuclear star clusters can retain the merger products. We also show that the estimated values of the effective spin and of the remnant spin of GW170729, GW190412, GW190519, and GW190620 can be reproduced if their progenitors were moderately spinning ($χ_{\rm max}\gtrsim 0.3$), while for GW190517 if the progenitors were rapidly spinning ($χ_{\rm max}\gtrsim 0.8$). Alternatively, some of these events could be explained if at least one of the progenitors is already a second-generation BH, originated from a previous merger.
description: 6 pages, 5 figures, accepted by MNRAS
Quantum manifestations of homogeneous and inhomogeneous oscillation suppression states
Creators: name: Bandyopadhyay, Biswabibek
name: Khatun, Taniya
name: Biswas, Debabrata
name: Banerjee, Tanmoy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the quantum manifestations of homogeneous and inhomogeneous oscillation suppression states in coupled identical quantum oscillators. We consider quantum van der Pol oscillators coupled via weighted mean-field diffusive coupling and using the formalism of open quantum system we show that depending upon the coupling and the density of mean-field, two types of quantum amplitude death occurs, namely squeezed and nonsqueezed quantum amplitude death. Surprisingly, we find that the inhomogeneous oscillation suppression state (or the oscillation death state) does not occur in the quantum oscillators in the classical limit. However, in the deep quantum regime we discover an oscillation death-like state which is manifested in the phase space through the symmetry-breaking bifurcation of Wigner function. Our results also hint towards the possibility of the transition from quantum amplitude death to oscillation death state through the "quantum" Turing-type bifurcation. We believe that the observation of quantum oscillation death state will deepen our knowledge of symmetry-breaking dynamics in the quantum domain.
description: First observation of Quantum Oscillation Death. Accepted in Phys. Rev. E
Dust-scattered X-ray halos around gamma-ray bursts: GRB 031203 revisited and the new case of GRB 050713A
Creators: name: Tiengo, Andrea
name: Mereghetti, Sandro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Scattering by interstellar dust grains can produce time variable X-ray halos around gamma-ray bursts (GRB). In particular, an X-ray expanding ring is expected when a short pulse of X-ray radiation is scattered by a narrow layer of dust in our Galaxy. We present a new method to detect and analyze dust scattering expanding rings around gamma-ray bursts, using as an example XMM-Newton data of GRB 031203. Consistent with previous reports (Vaughan et al. 2004), we find that the two expanding rings observed in this burst are due to dust unevenly distributed in two layers at distances of 870 and 1384 pc, with the more distant one responsible for 70% of the total optical depth. Our modelling of the rings indicates that the prompt X-ray emission of GRB 031203 was consistent with a power law spectrum with photon index $Γ$=2.1$\pm$0.2 and 1-2 keV fluence of (3.6$\pm$0.2)$\times10^{-7}$ erg cm$^{-2}$. Thanks to the sensitivity of our technique, we discovered an expanding ring around another burst recently observed with XMM-Newton, GRB 050713A. In this case the dust layer is located at a distance of 364 pc and we derive a GRB fluence of (1.2$\pm$0.3)$\times10^{-7}$ erg cm$^{-2}$ (1-2 keV). A search for similar halos in other twelve bursts observed with XMM-Newton gave negative results.
description: 7 pages, 7 figures, A&A accepted
Dynamics of a self--gravitating magnetized source
Creators: name: Rey, A. Ulacia
name: Martinez, A. Perez
name: Sussman, Roberto A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a magnetized degenerate gas of fermions as the matter source of a homogeneous but anisotropic Bianchi I spacetime with a Kasner--like metric. We examine the dynamics of this system by means of a qualitative and numerical study of Einstein-Maxwell field equations which reduce to a non--linear autonomous system. For all initial conditions and combinations of free parameters the gas evolves from an initial anisotropic singularity into an asymptotic state that is completely determined by a stable attractor. Depending on the initial conditions the anisotropic singularity is of the ``cigar'' or ``plate'' types.
description: 7 pages, 1 figure
A silicon-stereogenic silanol - 18O-isotope labeling and stereogenic probe reveals hidden stereospecific water exchange reaction
Creators: name: Langenohl, Felix
name: Rösler, Jonas
name: Zühlke, Sebastian
name: Kirchhoff, Jan-Lukas
name: Strohmann, Carsten
Publisher: name: TU Dortmund
Year: 2022
Subjects: subject: Chirality
subject: Configuration
subject: Isotopic labelling
subject: Silanols
subject: Silicon
subject: 540

description: A silicon-stereogenic aminosilanol was isolated in excellent diastereomeric ratio and the absolute configuration was determined. The silanol is configurative and condensation stable in solution and shows stereoselective transformations with a clean stereospecific pathway in follow-up reactions, which leads to the isolation of a silicon-stereogenic zinc complex and siloxane compounds. Investigations with 18O-labelled water and mass spectrometry analysis revealed an otherwise hidden exchange of oxygen atoms of silanol and water in solution that proceeds with retention of the configuration at the silicon center. This novel combination of a stereochemical probe and isotopic labeling in a silicon-stereogenic compound opens new analytic possibilities to study stereochemical courses of reactions with the aid of chiral silanols mechanistically.
description: Chemistry - a European journal;29(1)