cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evidence of symmetry lowering in antiferromagnetic metal TmB12 with dynamic charge stripes
Creators: name: Azarevich, A.
name: Glushkov, V.
name: Demishev, S.
name: Bogach, A.
name: Voronov, V.
name: Gavrilkin, S.
name: Shitsevalova, N.
name: Filipov, V.
name: Gabani, S.
name: Kacmarcik, J.
name: Flachbart, K.
name: Sluchanko, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Precise angle-resolved magnetoresistance and magnetization measurements have revealed (i) strong charge transport and magnetic anisotropy and (ii) emergence of a huge number of magnetic phases in the ground state of TmB12 antiferromagnetic metal with fcc crystal structure and dynamic charge stripes. By analyzing the angular H-fi magnetic phase diagrams reconstructed from experimental angle-resolved magnetoresistance and magnetization data we argue that the symmetry lowering is a consequence of suppression of the indirect Ruderman- Kittel-Kasuya-Yosida (RKKY) exchange along 110 directions between nearest neighboring magnetic moments of Tm3+ ions and subsequent redistribution of conduction electrons to quantum fluctuations of the electron density (stripes). Magnetoresistance components are discussed in terms of charge scattering on the spin density wave, itinerant ferromagnetic nano-domains and on-site Tm3+ spin fluctuations.
description: 22 pages including 14 figures
Radiation-induced large-scale structure during the reionization epoch: the autocorrelation function
Creators: name: Croft, Rupert A. C.
name: Altay, Gabriel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The structures produced during the epoch of reionization by the action of radiation on neutral hydrogen are in principle different to those that arise through gravitational growth of initially small perturbations. We explore the difference between the two mechanisms using high resolution cosmological radiative transfer. Our computations use a Monte Carlo code which raytraces directly through SPH kernels without a grid, preserving the high spatial resolution of the underlying hydrodynamic simulation. Because the properties of the first sources of radiation are uncertain, we simulate a range of models with different source properties and recombination physics. We examine the morphology of the neutral hydrogren distribution and the reionization history in these models. We find that at fixed mean neutral fraction, structures are visually most affected by the existence of a lower limit in source luminosity, then by galaxy mass to light ratio, and are minimally affected by changes in the recombination rate and amplitude of mass fluctuations. We concentrate on the autocorrelation function of the neutral hydrogen, xi_HI(r) as a basic quantitive measure of Radiation Induced Structure (RIS.) All the models we test exhibit a characteristic behaviour, with xi_HI(r) becoming initially linearly antibiased with respect to the matter correlation function, reaching a minimum bias factor b~0.5 when the universe is ~10-20% ionized. After this xi_HI(r) increases rapidly in amplitude, overtaking the matter correlation function. It keeps a power law shape, but flattens considerably, reaching an asymptotic logarithmic slope of gamma ~-0.5. The growth rate of HI fluctuations is exponentially more rapid than gravitational growth over a brief interval of redshift Deltaz ~ 2-3.
description: 21 pages, 20 figures, ApJ submitted
High-frequency air quality measurements at school gates during the morning drop off
Creators: name: O'Brien, Marta
Publisher: name: Zenodo
Year: 2024

description: Air aqality by school gate has been a subject of many research, especially in recent years. Here in Reading UK the issue of air pollution has been ongoing. 

High frequency measurement have been undertaken by three schools in East, West and South locations. It has been recorded that the level increas due to the increase traffic during the time of the arrival of the students and during the end of the day.

Short-term exposure to air pollution, especially as a repeated occurrence over an extended period can impact lung function, exacerbate preexisting conditions like asthma, increase respiratory and cardiovascular hospital admissions, and even cause death.
Supplemental Data.pdf
Creators: name: García-Grimshaw, Miguel
name: Domínguez-Moreno, Rogelio
name: Chávez-Martínez, Oswaldo Alan
name: Rebolledo-García, Daniel
name: Jarumi Crystal Diestel-Bautista
name: Michel-Chávez, Anaclara
name: Martínez, Juan Andrés Calderón-
name: Dioselina Panamá Tristán-Samaniego
name: Vigueras-Hernández, Alma
name: Estrada-Rodríguez, Humberto
name: Vega-Boada, Felipe Arturo
name: Dávila-Maldonado, Luis
name: Tanimoto-Licona, Miguel Ángel
name: Cantú-Brito, Carlos
name: González-Duarte, Alejandra
Publisher: name: figshare
Year: 2021
Subjects: subject: 110904 Neurology and Neuromuscular Diseases
subject: FOS: Clinical medicine
subject: Health Care
subject: 111716 Preventive Medicine
subject: FOS: Health sciences

description: Implementation and Patient Satisfaction of the First Neurological Telemedicine Program in Mexico
The calculus of names -- The legacy of Jan Łukasiewicz
Creators: name: Pietruszczak, Andrzej
Publisher: name: arXiv
Year: 2023
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03-03 (Primary) 03C55 (Secondary)

description: With his research on Aristotle's syllogistic, Jan Łukasiewicz (1934, 1939, 1957, 1963) initiates the branch of logic known as the calculus of names. This field deals with axiomatic systems that analyse various fragments of the logic of names, i.e., that branch of logic that studies various forms of names and functors acting on them, as well as logical relationships between sentences in which these names and functors occur. In this work, we want not only to present the genesis of the calculus of names and its first system created by Łukasiewicz. We also want to deliver systems that extend the first. In this work, we will also show that, from the point of view of modern logic, Łukasiewicz's approach to syllogistic is not the only possible one. However, this does not diminish Łukasiewicz's role in the study of syllogism. We believe that the calculus of names is undoubtedly the legacy of Łukasiewicz.
Aperiodic Ising model on the Bethe lattice: Exact results
Creators: name: Igloi, F.
name: Turban, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the Ising model on the Bethe lattice with aperiodic modulation of the couplings, which has been studied numerically in Phys. Rev. E 77, 041113 (2008). Here we present a relevance-irrelevance criterion and solve the critical behavior exactly for marginal aperiodic sequences. We present analytical formulae for the continuously varying critical exponents and discuss a relationship with the (surface) critical behavior of the aperiodic quantum Ising chain.
description: 7 pages, 3 figures, minor corrections
title: 5M 2015-2016
title: FOSA
titleType: Subtitle
Creators: name: Rümpker, Georg
name: Wölbern, Ingo
name: Leva, Carola
Publisher: name: GFZ German Research Centre for Geosciences
Year: 2021

description: The FOSA (FOgo Seismic Array) project has been carried out from October 2015 to December 2016 to investigate the seismicity of Fogo volcano after its eruption in 2014/2015. Fogo is the only volcano of the Cape Verde archipelago with reported historic eruptions. The eruptions occur frequently with an interval of about 20 years. However, the structure and extent of the related volcanic plumbing system are not well understood. The focus of the FOSA project was on the detection of ongoing magmatic activity and information about the plumbing system, using seismic array techniques. The array of the FOSA study was operated from October 2015 to December 2016, close to the village Achada Furna. From January 2016 we complemented the network with three additional broadband stations for an improved event detection and localization.
MPEC 2025-G59 : 2025 FX22
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FX22

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
On the Search for Quasar Light Echoes
Creators: name: Visbal, Eli
name: Croft, Rupert A. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The UV radiation from a quasar leaves a characteristic pattern in the distribution of ionized hydrogen throughout the surrounding space. This pattern or light echo propagates through the intergalactic medium at the speed of light, and can be observed by its imprint on the Ly-alpha forest spectra of background sources. As the echo persists after the quasar has switched off, it offers the possibility of searching for dead quasars, and constraining their luminosities and lifetimes. We outline a technique to search for and characterize these light echoes. To test the method, we create artificial Ly-alpha forest spectra from cosmological simulations at z=3, apply light echoes and search for them. We show how the simulations can also be used to quantify the significance level of any detection. We find that light echoes from the brightest quasars could be found in observational data. With absorption line spectra of 100 redshift z~3-3.5 quasars or galaxies in a 1 square degree area, we expect that ~10 echoes from quasars with B band luminosities L_B=3x10^45 ergs/s exist that could be found at 95% confidence, assuming a quasar lifetime of ~10^7 yr. Even a null result from such a search would have interesting implications for our understanding of quasar luminosities and lifetimes.
description: 9 pages, 7 figures, ApJ in press
MPC-Friendly Commitments for Publicly Verifiable Covert Security
Creators: name: Agrawal, Nitin
name: Bell, James
name: Gascón, Adrià
name: Kusner, Matt J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We address the problem of efficiently verifying a commitment in a two-party computation. This addresses the scenario where a party P1 commits to a value $x$ to be used in a subsequent secure computation with another party P2 that wants to receive assurance that P1 did not cheat, i.e. that $x$ was indeed the value inputted into the secure computation. Our constructions operate in the publicly verifiable covert (PVC) security model, which is a relaxation of the malicious model of MPC appropriate in settings where P1 faces a reputational harm if caught cheating. We introduce the notion of PVC commitment scheme and indexed hash functions to build commitments schemes tailored to the PVC framework, and propose constructions for both arithmetic and Boolean circuits that result in very efficient circuits. From a practical standpoint, our constructions for Boolean circuits are $60\times$ faster to evaluate securely, and use $36\times$ less communication than baseline methods based on hashing. Moreover, we show that our constructions are tight in terms of required non-linear operations, by proving lower bounds on the nonlinear gate count of commitment verification circuits. Finally, we present a technique to amplify the security properties our constructions that allows to efficiently recover malicious guarantees with statistical security.
description: Appeared at ACM CCS 2021
Monotone approximation of differentiable convex functions with applications to general minimization problems
Creators: name: Harjulehto, Petteri
name: Hästö, Peter
name: Torricelli, Andrea
Publisher: name: arXiv
Year: 2023
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35J87 (49J40, 47J20)

description: We study minimizers of non-autonomous energies with minimal growth and coercivity assumptions on the energy. We show that the minimizer is nevertheless the solution of the relevant Euler--Lagrange equation or inequality. The main tool is an extension result for convex $C^1$-energies.
description: The first word in the title was "monotonic" in earlier versions of the manuscript
title: The Transformations of Knowledge Through Cultural Interactions in Brazil: The Case of the Tupinikim and the Guarani
Creators: name: da Silva, Circe Mary Silva
name: Sad, Ligia Arantes
Publisher: name: Max-Planck-Gesellschaft zur Förderung der Wissenschaften
Year: 2012

description: 23.1 Introduction
23.2 A Glimpse into History
23.3 Identity, Language and Religion
23.4 Indigenous Practices
23.5 Education
23.6 Changes in Cultural Practices
References
Footnotes
High resolution H-alpha imaging of the Northern Galactic Plane, and the IGAPS images database
Creators: name: Greimel, R.
name: Drew, J. E.
name: Monguió, M.
name: Ashley, R. P.
name: Barentsen, G.
name: Eislöffel, J.
name: Mampaso, A.
name: Morris, R. A. H.
name: Naylor, T.
name: Roe, C.
name: Sabin, L.
name: Stecklum, B.
name: Wright, N. J.
name: Groot, P. J.
name: Irwin, M. J.
name: Barlow, M. J.
name: Fariña, C.
name: Fernández-Martín, A.
name: Parker, Q. A.
name: Phillipps, S.
name: Scaringi, S.
name: Zijlstra, A. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The INT Galactic Plane Survey (IGAPS) is the merger of the optical photometric surveys, IPHAS and UVEX, based on data from the Isaac Newton Telescope (INT) obtained between 2003 and 2018. These capture the entire northern Galactic plane within the Galactic coordinate range, -5
description: 21 pages, 14 main-text figures, 11 appendix figures. Images database and other supplementary items mentioned in the paper are available from http://www.igapsimages.org
title: Intracoronary electrocardiogram as a direct measure of myocardial ischemia
Creators: name: Bigler, Marius Reto
Publisher: name: Universität Bern
Year: 2021
Subjects: subject: 610 Medicine & health

description: The electrocardiogram is a valuable diagnostic method providing insight into pathologies of the heart, especially rhythm disorders or insufficient myocardial blood supply (myocardial ischemia). The commonly used surface ECG is, however, limited in detecting short-lasting myocardial ischemia, in particular in the territory of the left circumflex coronary artery supplying the postero-lateral wall of the left ventricle. Conversely, an ECG recorded in close vicinity to the myocardium, i.e., within a coronary artery (intracoronary ECG, icECG) has been thought to overcome these limitations. Since its first implementation during cardiac catheterization in 1985, icECG has shown ample evidence for its diagnostic value given the higher sensitivity for myocardial ischemia detection when compared to the surface ECG. In addition, icECG has been demonstrated to be a direct measure of myocardial ischemia in real-time, thus, providing valuable information during percutaneous coronary diagnostics and interventions. However, a lack of analysing systems to obtain and quantify icECG in real-time discourages routine use.

The goals of this MD-PhD thesis are two-fold: First, to determine the diagnostic accuracy of icECG ST-segment shift during pharmacologic inotropic stress in comparison to established indices for coronary lesion severity assessment using quantitative angiographic percent diameter stenosis as reference (Project I). Second, to determine the optimal icECG parameter for myocardial ischemia detection and quantification (Project II and III).

In essence, this thesis demonstrates that the icECG is an easy available diagnostic method providing highly accurate information on the amount of myocardial ischemia in real-time. Quantitative assessment of acute, transmural myocardial ischemia by icECG is most accurately performed by measuring ST-segment shift at the J-point, while the quantitative assessment during physical exercise, respectively its pharmacologic simulation, is most accurately performed by measuring ST-segment shift 60ms after the J-point.
The external benefits of government subsidized rehabilitation programs
Creators: name: Tucker, Earl Nathan
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the hypothesis that government housing policies - in particular rehabilitation policies - create positive spillover effects (externalities) to surrounding homes, buildings, and property values in general. These effects are examined for two reasons: (a)There is a large body of literature focussing on externalities created by government housing policies, but very little of this theory has been tested empirically; (b) The recent implementation of rehabilitation policies have been based in part on the expectation that the policies create positive neighborhood effects. In this study, an empirical analysis is performed on one rehabilitation program — the Canadian Residential Rehabilitation Assistance Program (RRAP). The program is analyzed via multivariate regression analysis to determine if any externalities are created by this housing policy. The determination of externalities is important in understanding the factors affecting neighborhood change. This study investigates the relationship between externalities and expectations and discusses how these factors can have large impacts on reinvestment patterns which create positive neighborhood change. The empirical findings of this study indicate that there are no externalities created by the RRAP program. This research suggests that such programs be implemented on the basis of the individual benefits for the recipient. The findings imply that similar rehabilitation programs will not create positive externalities or expectations and, hence, cannot be factors affecting neighborhood change. As a result, policy analysts should conclude that programs similar to RRAP should not be implemented solely on the basis that there are indirect external benefits to the neighborhood.
Predictions from non trivial Quark-Lepton complementarity
Creators: name: Picariello, Marco
name: Chauhan, Bhag C.
name: Pulido, Joao
name: Torrente-Lujan, Emilio
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The complementarity between the quark and lepton mixing matrices is shown to provide robust predictions. We obtain these predictions by first showing that the matrix V_M, product of the quark (CKM) and lepton (PMNS) mixing matrices, may have a zero (1,3) entry which is favored by experimental data. We obtain that any theoretical model with a vanishing (1,3) entry of V_M that is in agreement with quark data, solar, and atmospheric mixing angle leads to $θ_{13}^{PMNS}=(9{^{+1}_{-2}})^\circ$. This value is consistent with the present 90% CL experimental upper limit. We also investigate the prediction on the lepton phases. We show that the actual evidence, under the only assumption that the correlation matrix V_M product of CKM and PMNS has a zero in the entry (1,3), gives us a prediction for the three CP-violating invariants J, S_1, and S_2. A better determination of the lepton mixing angles will give stronger prediction for the CP-violating invariants in the lepton sector. These will be tested in the next generation experiments. Finally we compute the effect of non diagonal neutrino mass in "l_i -> l_j gamma" in SUSY theories with non trivial Quark-Lepton complementarity and a flavor symmetry. The Quark-Lepton complementarity and the flavor symmetry strongly constrain the theory and we obtain a clear prediction for the contribution to "mu -> e gamma" and the "tau" decays "tau -> e gamma" and "tau -> mu gamma". If the Dirac neutrino Yukawa couplings are degenerate but the low energy neutrino masses are not degenerate, then the lepton decays are related among them by the V_M entries. On the other hand, if the Dirac neutrino Yukawa couplings are hierarchical or the low energy neutrino masses are degenerate, then the prediction for the lepton decays comes from the CKM hierarchy.
description: 15 pages, 5 figures, ws-ijmpa class included, Proceedings of the CTP Symposium on Sypersymmetry at LHC
BIRD: A Trustworthy Bayesian Inference Framework for Large Language Models
Creators: name: Feng, Yu
name: Zhou, Ben
name: Lin, Weidong
name: Roth, Dan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Predictive models often need to work with incomplete information in real-world tasks. Consequently, they must provide reliable probability or confidence estimation, especially in large-scale decision-making and planning tasks. Current large language models (LLMs) are insufficient for accurate estimations, but they can generate relevant factors that may affect the probabilities, produce coarse-grained probabilities when the information is more complete, and help determine which factors are relevant to specific downstream contexts. In this paper, we make use of these capabilities of LLMs to provide a significantly more accurate probabilistic estimation. We propose BIRD, a novel probabilistic inference framework that aligns a Bayesian network with LLM abductions and then estimates more accurate probabilities in a deduction step. We show BIRD provides reliable probability estimations that are 30% better than those provided directly by LLM baselines. These estimates further contribute to better and more trustworthy decision making.
A critical discussion of different methods and models in Casimir effect
Creators: name: Brevik, Iver
name: Shapiro, Boris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The Casimir-Lifhitz force acts between neutral material bodies and is due to the fluctuations (around zero) of the electrical polarizations of the bodies. This force is a macroscopic manifestation of the van der Waals forces between atoms and molecules. In addition to being of fundamental interest, the Casimir-Lifshitz force plays an important role in surface physics, nanotechnology and biophysics. There are two different approaches in the theory of this force. One is centered on the fluctuations inside the bodies, as the source of the fluctuational electromagnetic fields and forces. The second approach is based on finding the eigenmodes of the field, while the material bodies are assumed to be passive and non-fluctuating. In spite of the fact that both approaches have a long history, there are still some misconceptions in the literature. In particular, there are claims that (hypothetical) materials with a strictly real dielectric function $\varepsilon(ω)$ can give rise to fluctuational Casimir-Lifshitz forces. We review and compare the two approaches, using the simple example of the force in the absence of retardation. We point out that also in the second (the "field-oriented") approach one cannot avoid introducing an infinitesimal imaginary part into the dielectric function, i.e. introducing some dissipation. Furthermore, we emphasize that the requirement of analyticity of $ \varepsilon(ω)$ in the upper half of the complex $ω$ plane is not the only one for a viable dielectric function. There are other requirements as well. In particular, models that use a strictly real $\varepsilon(ω)$ (for all real positive $ω)$ are inadmissible and lead to various contradictions and inconsistencies. Specifically, we present a critical discussion of the "dissipation-less plasma model".
description: 21 pages, 3 figures. Discussion extended, new references
Piper courtallensis P. K. Mukh. 2020, nom. nov.
Creators: name: Mukherjee, Prasanta Kumar
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Piperales
Piperaceae
Piper
Piper courtallensis

description: 3. Piper courtallensis P. K. Mukh. nom. nov.
Replaced name: Piper nepalense Wight Icones Ind. Or. 6: 4. t. 1938. 1853 non Miquel. Syst. Piperac.1844: 318. nom. illeg.
Piper argyrophyllum Miquel var. 3. Hook. f. Fl. Brit. India 5: 94.1886. nom. invalid.
Type: — INDIA: Tamilnadu, Courtallum, (lectotype designated here) Wight 964 K (K000794441 image!); syntype Wight 3018 K (K000794440 image!).
Plants drying grayish, leaves membranaceous to little coriaceous, ovate elliptic, 6–9 cm × 3–5 cm, prominently to slightly unequal to subequal sided, apex acute, veins 7, two basal lateral veins are short, the upper two pairs converging towards the apex, the two upper most reaching almost to the apex. Spikes are one and half times longer than leaves. Female spikes are slender, not all flowers maturing to fruits; fruits ovate; bracts at the base of the fruits with sinuate margins.
Distribution:— INDIA: Tamilnadu.
Note:— Hooker (1886: 94) described his var. 3 of P. argyrophyllum based on Wight’s Icon. t. 1938. Wight (1853: 4) admitted that the description given by Hooker does not match his illustration no. 1938. The name P. nepalense Wt. is occupied by P.nepalense Miquel (1844: 318). While P.nepalense (P. suipigua) is principally a northern species, occurring in the Himalayas from Uttarakhand, Nepal, Bhutan, Arunachal Pradesh, and Meghalaya in India besides China, P. argyrophyllum is a southern Indian species. Leaves in P. suipigua are more coriaceous, not whitish beneath. It has tomentose inflorescence rachis and bracts which are peltate orbicular. The species differs from P. argyrophyllum, P. kurgianum and P. travancorianum by having larger somewhat coriaceous ovate elliptic 7- nerved leaves which are not whitish beneath, and bracts with raised sinuate margin. Hooker (1886: 94) commented on its resemblance with P. sylvestre Lamarck (P. lamarckianum) but the leaf of the latter species is broadly ovate lanceolate with shallowly cordate or rounded unequal base. Piper wightii Miquel has more coriaceous leaves with strong nerves beneath. The specific epithet refers to the type locality.
description: Published as part of Mukherjee, Prasanta Kumar, 2020, Nomenclatural notes on Piper (Piperaceae) from India III, pp. 263-273 in Phytotaxa 441 (3) on pages 265-266, DOI: 10.11646/phytotaxa.441.3.3, http://zenodo.org/record/13872694
Projector Pixel Redirection Using Phase-Only Spatial Light Modulator
Creators: name: Terai, Haruka
name: Iwai, Daisuke
name: Sato, Kosuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: In projection mapping from a projector to a non-planar surface, the pixel density on the surface becomes uneven. This causes the critical problem of local spatial resolution degradation. We confirmed that the pixel density uniformity on the surface was improved by redirecting projected rays using a phase-only spatial light modulator.
description: Author's version of a paper published at IDW (International Display Workshops) 2020
Stroboceras undetermined
Creators: name: Korn, Dieter
name: Bockwinkel, Jürgen
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Nautilida
Trigonoceratidae
Stroboceras
Stroboceras undetermined

description: Stroboceras sp.
Fig. 13, Table 7
Material examined
ALGERIA • 1 specimen; Sebkha de Timimoun 14.5 km west-southwest of Timimoun (locality TIM-C8); Argiles de Timimoun supérieur (Upper Bollandoceras Assemblage; early to middle Viséan); Korn et al. 2002 Coll.; illustrated in Fig. 13; MB.C.30460.
Description
The only specimen present is a phragmocone fragment consisting of three chambers (Fig. 13A). It has, at 10.5 mm whorl height, a depressed pentagonal whorl profile (ww/wh = 1.44). It shows a prominent, rounded ventrolateral shoulder accompanied by shallow longitudinal grooves. The centre of the venter is shallowly convex and the umbilical margin separates the weakly convex flank from the almost flat umbilical wall by a low ridge (Fig. 13B). A narrow, very shallow concave whorl zone is present. The suture line shows a course dependent on the outline of the whorl profile; saddles lie in the inflated areas of the profile and lobes in the indented ones (Fig. 13C). Therefore, the external lobe appears trilobate and the ventrolateral saddle is raised. An internal lobe is induced by the concave whorl zone.
description: Published as part of Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, pp. 67-108 in European Journal of Taxonomy 831 on page 84, DOI: 10.5852/ejt.2022.831.1871, http://zenodo.org/record/6885198
A Chevalley's theorem in class C^r
Creators: name: Barbançon, Gerard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 57R45; 13A50; 20F55

description: Let W be a finite reflection group acting orthogonally on R^n, P be the Chevalley polynomial mapping determined by an integrity basis of the algebra of W-invariant polynomials, and h be the highest degree of the coordinate polynomials in P.There exists a linear mapping from (C^r(R^n))^W to C^[r/h](R^n), f\mapsto F such that f=F \circ P, continuous for the natural Fréchet topologies. A general counterexample shows that this result is the best possible. The proof uses techniques of division by linear forms and a study of compensation phenomenons. An extension to P^{-1}(R^n) of invariant formally holomorphic regular fields is needed.
description: 13 pages
Singlet fermion dark matter and Dirac neutrinos from Peccei-Quinn symmetry
Creators: name: Carvajal, Cristian D. R.
name: Longas, Robinson
name: Rodríguez, Oscar
name: Zapata, Óscar
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Peccei-Quinn (PQ) mechanism not only acts as an explanation for the absence of strong CP violation but also can play a main role in the solution to other open questions in particle physics and cosmology. Here we consider a model that identifies the PQ symmetry as a common thread in the solution to the strong CP problem, the generation of radiative Dirac neutrino masses and the origin of a multicomponent dark sector. Specifically, scotogenic neutrino masses arise at one loop level with the lightest fermionic mediator field acting as the second dark matter (DM) candidate thanks to the residual $Z_2$ symmetry resulting from the PQ symmetry breaking. We perform a phenomenological analysis addressing the constraints coming from the direct searches of DM, neutrino oscillation data and charged lepton flavor violating (LFV) processes. We find that the model can be partially probed in future facilities searching for WIMPs and axions, and accommodates rates for rare leptonic decays that are within the expected sensitivity of upcoming LFV experiments.
description: 28 pages and 8 figures
Loop quantum gravity corrections to gravitational wave dispersion
Creators: name: Bojowald, Martin
name: Hossain, Golam Mortuza
Publisher: name: arXiv
Year: 2007
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: Cosmological tensor perturbations equations are derived for Hamiltonian cosmology based on Ashtekar's formulation of general relativity, including typical quantum gravity effects in the Hamiltonian constraint as they are expected from loop quantum gravity. This translates to corrections of the dispersion relation for gravitational waves. The main application here is the preservation of causality which is shown to be realized due to the absence of anomalies in the effective constraint algebra used.
description: 27 pages
Controlling magnetism through Ising superconductivity in magnetic van der Waals heterostructures
Creators: name: Aikebaier, Faluke
name: Heikkilä, Tero T.
name: Lado, J. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Van der Waals heterostructures have risen as a tunable platform to combine different electronic orders, due to the flexibility in stacking different materials with competing symmetry broken states. Among them, van der Waals ferromagnets such as CrI3 and superconductors as NbSe2 provide a natural platform to engineer novel phenomena at ferromagnet-superconductor interfaces. In particular, NbSe2 is well known for hosting strong spin-orbit coupling effects that influence the properties of the superconducting state. Here we put forward a ferromagnet/NbSe2/ferromagnet heterostructure where the interplay between Ising superconductivity in NbSe2 and magnetism controls the magnetic alignment of the heterostructure. In particular, we show that the interplay between spin-orbit coupling and superconductivity allows controlling magnetic states in van der Waals materials. Our results show how hybrid van der Waals ferromagnet/superconductor heterostructure can be used as a tunable materials platform for superconducting spin-orbitronics.
description: 10 pages, 4 figures
D-brane States and Annulus Amplitudes in OSp Invariant Closed String Field Theory
Creators: name: Baba, Yutaka
name: Ishibashi, Nobuyuki
name: Murakami, Koichi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the OSp invariant closed string field theory, we construct the states corresponding to parallel D-branes that are located at different points in the space-time. Using these states, we evaluate annulus amplitudes. We show that the results coincide with those of first quantized string theory.
description: 14 pages, 3 figures
No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $\mathbf{3.1 \lesssim z \lesssim 3.5}$
Creators: name: Saxena, A.
name: Pentericci, L.
name: Ellis, R. S.
name: Guaita, L.
name: Calabrò, A.
name: Schaerer, D.
name: Vanzella, E.
name: Amorín, R.
name: Bolzonella, M.
name: Castellano, M.
name: Fontanot, F.
name: Hathi, N. P.
name: Hibon, P.
name: Llerena, M.
name: Mannucci, F.
name: Saldana-Lopez, A.
name: Talia, M.
name: Zamorani, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present Lyman continuum (LyC) radiation escape fraction $f_{\rm{esc}}$ measurements for 183 spectroscopically confirmed star-forming galaxies in the redshift range $3.11 < z < 3.53$ in the \textit{Chandra} Deep Field South. We use ground-based imaging to measure $f_{\rm{esc}}$, and use ground- and space-based photometry to derive galaxy physical properties using spectral energy distribution (SED) fitting. We additionally derive [O III]+H$β$ equivalent widths (that fall in the observed K band) by including nebular emission in the SED fitting. After removing foreground contaminants, we report the discovery of 11 new candidate LyC leakers, with absolute LyC escape fractions, $f_{\rm{esc}}$ in the range $0.14-0.85$. From non-detections, we place $1σ$ upper limits of $f_{\rm{esc}}<0.12$, where the Lyman-break selected galaxies have $f_{\rm{esc}} < 0.11$ and `blindly' discovered galaxies with no prior photometric selection have $f_{\rm{esc}}<0.13$. We find a slightly higher $1σ$ limit of $f_{\rm{esc}}<0.20$ for extreme emission line galaxies with rest-frame [O III]+H$β$ equivalent widths $>300$A. For candidate LyC leakers, we find a weak negative correlation between $f_{\rm{esc}}$ and galaxy stellar masses, no correlation between $f_{\rm{esc}}$ specific star-formation rates (sSFRs) and a positive correlation between $f_{\rm{esc}}$ and EW$_0$([O III]+H$β$). The weak/no correlations between stellar mass and sSFRs may be explained by misaligned viewing angles and/or non-coincident timescales of starburst activity and periods of high $f_{\rm{esc}}$. Alternatively, escaping radiation may predominantly occur in highly localised star-forming regions, or $f_{\rm{esc}}$ measurements may be impacted by stochasticity of the intervening neutral medium, obscuring any global trends with galaxy properties. These hypotheses have important consequences for models of reionisation.
description: 19 pages, 11 figures, 1 appendix, published in Monthly Notices of the Royal Astronomical Society
Teaching sculpture : a rationale and resource kit
Creators: name: McFeely, Susanne Gayle
Publisher: name: University of British Columbia
Year: 2010

description: This resource kit presents reasons for ensuring that sculpture becomes an integral part of British Columbia schools' art curriculum. An approach to creating readiness, a glossary, a criteria-based definition of sculpture, and a system of critical analysis is offered. The resource kit is complete with maps, slides, background information, classroom and fieldtrip activities. Its aim is to present, based on local resources, an integrated approach to the historical, critical, and productive domains of sculpture. An entire section of the thesis reviews, as a model for this approach, over one hundred and fifty pieces of sculpture found in Vancouver. Another section focuses on the technical aspects of producing sculpture. One media is developed as a model for each technique. Other media are listed with pertinent written and audio visual resources and examples of sculptors known for their work with these media. The appendix presents material to show the diversity of sculpture, both contemporary and historical, in local and international environments. The intention of the resource kit is to provide teachers with information concerning what sculpture can be, what sculpture is, and when, how, and why it is created. The hope is that this introduction and overview of this visual expression area will facilitate sculpture becoming an equitable part of British Columbia school art programs.
Logarithmic current fluctuations in non-equilibrium quantum spin chains
Creators: name: Antal, Tibor
name: Krapivsky, P. L.
name: Rákos, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study zero-temperature quantum spin chains which are characterized by a non-vanishing current. For the XX model starting from the initial state |... + + + - - - ...> we derive an exact expression for the variance of the total spin current. We show that asymptotically the variance exhibits an anomalously slow logarithmic growth; we also extract the sub-leading constant term. We then argue that the logarithmic growth remains valid for the XXZ model in the critical region.
description: 9 pages, 4 figures, minor alterations
The Holographic c-theorem and Infinite-dimensional Lie Algebras
Creators: name: Bergshoeff, Eric A.
name: Ozkan, Mehmet
name: Zog, Mustafa Salih
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 discuss a non-dynamical theory of gravity in three-dimensions which is based on an infinite-dimensional Lie algebra that is closely related to an infinite-dimensional extended AdS algebra. We find an intriguing connection between on the one hand higher-derivative gravity theories that are consistent with the holographic c-theorem and on the other hand truncations of this infinite-dimensional Lie algebra that violate the Lie algebra structure. We show that in three dimensions different truncations reproduce, up to terms that do not contribute to the c-theorem, Chern-Simons-like gravity models describing extended 3D massive gravity theories. Performing the same procedure with similar truncations in dimensions larger than or equal to four reproduces higher derivative gravity models that are known in the literature to be consistent with the c-theorem but do not have an obvious connection to massive gravity like in three dimensions.
description: 16 pages, 1 figure, v2: Typos Corrected, Reference Added, Version appeared in JHEP
Loschmidt echo and stochastic-like quantum dynamics of nano-particles
Creators: name: Benderskii, V. A.
name: Falkovsky, L. A.
name: Kats, E. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate time evolution of prepared vibrational state (system) coupled to a reservoir with dense spectrum of its vibrational states. We assume that the reservoir has an equidistant spectrum, and the system - reservoir coupling matrix elements are independent of the reservoir states. The analytical solution manifests three regimes of the evolution for the system: (I) weakly damped oscillations; (II) multicomponent Loschmidt echo in recurrence cycles; (III) overlapping recurrence cycles. We find the characteristic critical values of the system - reservoir coupling constant for the transitions between these regimes. Stochastic dynamics occurs in the regime (III) due to inevoidably in any real system coarse graining of time or energy measurements, or initial condition uncertainty. Even though a specific toy model is investigated here, when properly interpreted it yields quite reasonable description for a variety of physically relevant phenomena.
description: 8 pages, 3 figures
Learning Decision Policies with Instrumental Variables through Double Machine Learning
Creators: name: Shao, Daqian
name: Soleymani, Ashkan
name: Quinzan, Francesco
name: Kwiatkowska, Marta
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: A common issue in learning decision-making policies in data-rich settings is spurious correlations in the offline dataset, which can be caused by hidden confounders. Instrumental variable (IV) regression, which utilises a key unconfounded variable known as the instrument, is a standard technique for learning causal relationships between confounded action, outcome, and context variables. Most recent IV regression algorithms use a two-stage approach, where a deep neural network (DNN) estimator learnt in the first stage is directly plugged into the second stage, in which another DNN is used to estimate the causal effect. Naively plugging the estimator can cause heavy bias in the second stage, especially when regularisation bias is present in the first stage estimator. We propose DML-IV, a non-linear IV regression method that reduces the bias in two-stage IV regressions and effectively learns high-performing policies. We derive a novel learning objective to reduce bias and design the DML-IV algorithm following the double/debiased machine learning (DML) framework. The learnt DML-IV estimator has strong convergence rate and $O(N^{-1/2})$ suboptimality guarantees that match those when the dataset is unconfounded. DML-IV outperforms state-of-the-art IV regression methods on IV regression benchmarks and learns high-performing policies in the presence of instruments.
description: Accepted at ICML 2024
Closed string amplitudes around tachyon vacuum solution in Kaku theory
Creators: name: Ando, Yuji
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We incorporate closed string field into Kaku's open string field theory which is defined by using Kaku vertex, and we construct open-closed string field theory. To do this, we define new consistent open-closed vertex and open-open-closed vertex with the Kaku vertex. Because these vertices depend on Chan-Paton parameter such as the Kaku vertex, the open-closed string field theory action that we construct depends on the Chan-Paton parameter such as the Kaku's theory action. However, we can show that an infinitesimal change of $l$ corresponds to a field redefinition. Furthermore, we compute closed string amplitudes around tachyon vacuum solution in this theory. As a result, we confirm that these are conventional pure closed string amplitudes on surfaces without boundaries.
description: 16 pages, 4 figures; published version
Quantum Transport and Potential of Topological States for Thermoelectricity in Bi$_2$Te$_3$ Thin Films
Creators: name: Ngabonziza, Prosper
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This paper reviews recent developments in quantum transport and it presents recent efforts to explore the contribution of topological insulator boundary states to thermoelectricity in Bi$_2$Te$_3$ thin films. Although Bi$_2$Te$_3$ has been used as a thermoelectric material for many years, it is only recently that thin films of this material have been synthesized as 3D topological insulators with interesting physics and potential applications related to topologically protected surface states. A major bottleneck in Bi$_2$Te$_3$ thin films has been eliminating its bulk conductivity while increasing its crystal quality. The ability to grow epitaxial films with high crystal quality and to fabricate sophisticated Bi$_2$Te$_3$-based devices is attractive for implementing a variety of topological quantum devices and exploring the potential of topological states to improve thermoelectric properties. Special emphasis is laid on preparing low-defect-density Bi$_2$Te$_3$ epitaxial films, gate-tuning of normal-state transport and Josephson supercurrent in topological insulator/superconductor hybrid devices. Prospective quantum transport experiments on Bi$_2$Te$_3$ thin-film devices are discussed as well. Finally, an overview of current progress on the contribution of topological insulator boundary states to thermoelectricity is presented. Future explorations to reveal the potential of topological states for improving thermoelectric properties of Bi$_2$Te$_3$ films and realizing high-performance thermoelectric devices are discussed.
description: Topical Review Article, 12 figures
Reduction Procedures in Classical and Quantum Mechanics
Creators: name: Carinena, J. F.
name: Clemente-Gallardo, J.
name: Marmo, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present, in a pedagogical style, many instances of reduction procedures appearing in a variety of physical situations, both classical and quantum. We concentrate on the essential aspects of any reduction procedure, both in the algebraic and geometrical setting, elucidating the analogies and the differences between the classical and the quantum situations.
description: AMS-LaTeX, 35 pages. Expanded version of the Invited review talk delivered by G. Marmo at XXIst International Workshop On Differential Geometric Methods In Theoretical Mechanics, Madrid (Spain), 2006. To appear in Int. J. Geom. Methods in Modern Physics
Aus dem Karton in die Vitrine – ein Schauraum für Keramik im Zentralen Fundarchiv
Creators: name: Gobbers, Christian
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)