cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ultracool Benchmark Companions to Gaia Stars
Creators: name: Dover, Lord
Publisher: name: UH Research Archive
Year: 2019
Subjects: brown dwarfs
ultra-cool dwarfs
Gaia

description: Ultracool dwarfs are stellar and sub-stellar objects with spectral types of M7 or later and effective temperatures below 2700K. Over 1300 have been discovered to date, both as free-floating objects and companions to more massive stars. It is difficult to constrain the physical properties of an ultracool dwarf, as they have low luminosities and are generally not found as close companions. Models for the evolution, composition and atmospheres of ultracool dwarfs depend on having examples with independently measured physical properties; these are known as `benchmark' ultracool dwarfs. To independently determine a physical property, the ultracool dwarf must be associated with a star. This thesis describes a search for ultracool companions that may be suitable benchmarks using various optical and infrared surveys in combination with the Gaia TGAS and DR2 catalogues. This search utilises existing methods in novel ways to identify and select candidates, with a particular focus on identifying rare or unusual objects that may have features for which there is currently no benchmark. This thesis presents 32 candidate companions that are recommended for follow-up observations, plus a further 227 candidates that require further analysis in future work.
Twist-angle tunable spin texture in WSe$_2$/graphene van der Waals heterostructures
Creators: name: Yang, Haozhe
name: Martín-García, Beatriz
name: Kimák, Jozef
name: Schmoranzerová, Eva
name: Dolan, Eoin
name: Chi, Zhendong
name: Gobbi, Marco
name: Němec, Petr
name: Hueso, Luis E.
name: Casanova, Fèlix
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Angle-twisting engineering has emerged as a powerful tool for modulating electronic properties in van der Waals heterostructures. Recent theoretical works have predicted the modulation of spin texture in graphene-based heterostructures by twist angle, although an experimental verification is missing. Here, we demonstrate the tunability of the spin texture and associated spin-charge interconversion with twist angle in WSe$_2$/graphene heterostructures by using spin precession experiments. For specific twist angles, we experimentally detect a spin component radial with the electron's momentum, in addition to the standard orthogonal component. Our results show that the helicity of the spin texture can be reversed by angle twisting, highlighting its critical role on the spin-orbit properties of WSe$_2$/graphene heterostructures and paving the way for the development of novel spin-twistronic devices.
description: 14 pages, 5 figures and Supplementary Information
Supplemental materials Sources of confusion in global biodiversity trends
Creators: name: Maelys Boennec
Publisher: name: Zenodo
Year: 2023

description: Supplemental materials for preprint: Sources of confusion in global biodiversity trends

Including

- The extracted papers and reasons for rejection (screening_process_sources_of_confusion.ods)

- The final metadata base (metadata_sources_of_confusion.ods)

- Supplementrary figures and tables (supplementary_sources_of_confusion.pdf)
Resonant Raman Scattering of Few Layers CrBr$_3$
Creators: name: Kipczak, Łucja
name: Karmakar, Arka
name: Grzeszczyk, Magdalena
name: Janiszewska, Róża
name: Woźniak, Tomasz
name: Chen, Zhaolong
name: Pawłowski, Jan
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Babiński, Adam
name: Koperski, Maciej
name: Molas, Maciej R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the vibrational and magnetic properties of thin layers of chromium tribromide (CrBr$_3$) with a thickness ranging from three to twenty layers (3~L to 20~L) revealed by the Raman scattering (RS) technique. Systematic dependence of the RS process efficiency on the energy of the laser excitation is explored for four different excitation energies: 1.96 eV, 2.21 eV, 2.41 eV, and 3.06 eV. Our characterization demonstrates that for 12 L CrBr$_3$, 3.06~eV excitation could be considered resonant with interband electronic transitions due to the enhanced intensity of the Raman-active scattering resonances and the qualitative change in the Raman spectra. Polarization-resolved RS measurements for 12 L CrBr$_3$ and first-principles calculations allow us to identify five observable phonon modes characterized by distinct symmetries, classified as the A$_\textrm{g}$ and E$_\textrm{g}$ modes. The evolution of phonon modes with temperature for a 20 L CrBr$_3$ encapsulated in hexagonal boron nitride flakes demonstrates alterations of phonon energies and/or linewidths of resonances indicative of a transition between the paramagnetic and ferromagnetic state at Curie temperature ($T_\textrm{C} \approx 50$ K). The exploration of the effects of thickness on the phonon energies demonstrated small variations pronounces exclusively for the thinnest layers in the vicinity of 3 - 5 L. This observation is attributed to strong localization in the real space of interband electronic excitations, limiting the effects of confinement for resonantly excited Raman modes to atomically thin layers.
description: 12 pages, 5 figures
An occupation number quantum subspace expansion approach to compute the single-particle Green function: an opportunity for noise filtering
Creators: name: Gauthier, B.
name: Rosenberg, P.
name: Foley, A.
name: Charlebois, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a hybrid quantum-classical algorithm to compute the Green function for strongly correlated electrons on noisy intermediate-scale quantum (NISQ) devices. The technique consists in the construction of a non-orthogonal excitation basis composed of a set of single-particle excitations generated by occupation number operators. The excited sectors of the Hamiltonian in this basis can then be measured on the quantum device and a classical post-processing procedure yields the Green function in the Lehmann representation. The technique allows for noise filtering, a useful feature for NISQ devices. To validate the approach, we carry out a set of proof-of-principle calculations on the single-band Hubbard model on IBM quantum hardware. For a 2 site system we find good agreement between the results of quantum simulations and the exact result for the local spectral function. This proof-of-principle also shows that the noise filtering provides a reliable way to get rid of satellite peaks present in the spectral weight obtained from a NISQ device. A simulation of a 4 site system carried out on classical hardware suggests that the approach can achieve similar accuracy for larger systems.
description: 12 pages, 6 figures
Vocalics in Human-Drone Interaction
Creators: name: Lieser, Marc
name: Schwanecke, Ulrich
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: As the presence of flying robots continues to grow in both commercial and private sectors, it necessitates an understanding of appropriate methods for nonverbal interaction with humans. While visual cues, such as gestures incorporated into trajectories, are more apparent and thoroughly researched, acoustic cues have remained unexplored, despite their potential to enhance human-drone interaction. Given that additional audiovisual and sensory equipment is not always desired or practicable, and flight noise often masks potential acoustic communication in rotary-wing drones, such as through a loudspeaker, the rotors themselves offer potential for nonverbal communication. In this paper, quadrotor trajectories are augmented by acoustic information that does not visually affect the flight, but adds audible information that significantly facilitates distinctiveness. A user study (N=192) demonstrates that sonically augmenting the trajectories of two aerial gestures makes them more easily distinguishable. This enhancement contributes to human-drone interaction through onboard means, particularly in situations where the human cannot see or look at the drone.
Bilinear Expansions of KP Multipair Correlators in BKP Correlators
Creators: name: Orlov, Aleksandr Yu.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: I present a generalization of our joint works with John Harnad (2021) that relates Schur functions, KP tau functions and KP correlation functions to Schur's $Q$-functions, BKP tau functions and BKP correlation functions, respectively.
description: Dedicated to John Harnad on the ocassion of his 75th birthday
Unleashing the Power of EFT in Neutrino-Nucleus Scattering
Creators: name: Kopp, Joachim
name: Rocco, Noemi
name: Tabrizi, Zahra
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Neutrino physics is advancing into a precision era with the construction of new experiments, particularly in the few GeV energy range. Within this energy range, neutrinos exhibit diverse interactions with nucleons and nuclei. This study delves in particular into neutrino--nucleus quasi-elastic cross sections, taking into account both standard and, for the first time, non-standard interactions, all within the framework of effective field theory (EFT). The main uncertainties in these cross sections stem from uncertainties in the nucleon-level form factors, and from the approximations necessary to solve the nuclear many-body problem. We explore how these uncertainties influence the potential of neutrino experiments to probe new physics introduced by left-handed, right-handed, scalar, pseudoscalar, and tensor interactions. For some of these interactions the cross section is enhanced, making long-baseline experiments an excellent place to search for them. Our results, including tabulated cross sections for all interaction types and all neutrino flavors, can serve as the foundation for such searches.
description: 27 pages, 3 figures; v2: Corrected typos, as appears in JHEP
Sometimes reliable spanners of almost linear size
Creators: name: Buchin, Kevin
name: Har-Peled, Sariel
name: Oláh, Dániel
Publisher: name: Journal of Computational Geometry
Year: 2022

description: $\renewcommand{\Re}{\mathbb{R}}\newcommand{\Of}{\mathcal{O}}\newcommand{\eps}{\varepsilon}$Reliable (Euclidean) spanners can withstand huge failures, even when a linear number of vertices are deleted from the network. In case of failures, some of the remaining vertices of a reliable spanner may no longer admit the spanner property, but this collateral damage is bounded by a fraction of the size of the attack. It is known that $\Omega(n\log n)$ edges are needed to achieve this strong property, where $n$ is the number of vertices in the network, even in one dimension. Constructions of reliable geometric~$(1+\eps)$-spanners, for $n$ points in $\Re^d$, are known, where the resulting graph has $\Of( n \log n \log\!\log^{6}\!n )$ edges. Here, we show randomized constructions of smaller size Euclidean spanners that have the desired reliability property in expectation or with good probability. The new construction is simple, and potentially practical -- replacing a hierarchical usage of expanders (which renders the previous constructions impractical) by a simple skip list like construction. This results in a $1$-spanner, on the line, that has linear number of edges. Using this, we present a construction of a reliable spanner in $\Re^d$ with~$\Of( n \log\!\log^{2}\!n \log\!\log\!\log n )$ edges.
description: Journal of Computational Geometry, Vol. 13 No. 1 (2022)
Worst-Case Optimal Squares Packing into Disks
Creators: name: Fekete, Sándor P.
name: Gurunathan, Vijaykrishna
name: Juneja, Kushagra
name: Keldenich, Phillip
name: Kleist, Linda
name: Scheffer, Christian
Publisher: name: Journal of Computational Geometry
Year: 2022

description: $\newcommand{\nicefrac}{\tfrac}$We provide a tight result for a fundamental problem arising from packing squares into a circular container: The critical density of packing squares into a disk is $\delta=\nicefrac{8}{5\pi}\approx 0.509$. This implies that any set of (not necessarily equal) squares of total area $A \leq \nicefrac{8}{5}$ can always be packed into a disk with radius 1; in contrast, for any $\varepsilon>0$ there are sets of squares of total area $\nicefrac{8}{5}+\varepsilon$ that cannot be packed, even if squares may be rotated. This settles the last (and arguably, most elusive) case of packing circular or square objects into a circular or square container: The critical densities for squares in a square ($\nicefrac{1}{2}$), circles in a square ($\nicefrac{\pi}{(3+2\sqrt{2})}\approx 0.539)$ and circles in a circle ($\nicefrac{1}{2}$) have already been established, making use of recursive subdivisions of a square container into pieces bounded by straight lines, or the ability to use recursive arguments based on similarity of objects and container; neither of these approaches can be applied when packing squares into a circular container. Our proof uses a careful manual analysis, complemented by a computer-assisted part that is based on interval arithmetic. Beyond the basic mathematical importance, our result is also useful as a blackbox lemma for the analysis of recursive packing algorithms. At the same time, our approach showcases the power of a general framework for computer-assisted proofs, based on interval arithmetic.
description: Journal of Computational Geometry, Vol. 12 No. 2 (2021)
Existence and Density Theorems of Henig Global Proper Efficient Points
Creators: name: García-Castaño, Fernando
name: Melguizo-Padial, Miguel Ángel
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 90C29, 90C30, 49J27, 46N10

description: In this work, we provide some novel results that establish both the existence of Henig global proper efficient points and their density in the efficient set for vector optimization problems in arbitrary normed spaces. Our results do not require the assumption of convexity, and in certain cases, can be applied to unbounded sets. However, it is important to note that a weak compactness condition on the set (or on a section of it) and a separation property between the order cone and its conical neighborhoods remains necessary. The weak compactness condition ensures that certain convergence properties hold. The separation property enables the interpolation of a family of Bishop-Phelps cones between the order cone and each of its conic neighborhoods. This interpolation, combined with the proper handling of two distinct types of conic neighborhoods, plays a crucial role in the proofs of our results, which include as a particular case other results that have already been established under more restrictive conditions.
Delaunay triangulations of generalized Bolza surfaces
Creators: name: Ebbens, Matthijs
name: Iordanov, Iordan
name: Teillaud, Monique
name: Vegter, Gert
Publisher: name: Journal of Computational Geometry
Year: 2022

description: The Bolza surface can be seen as the quotient of the hyperbolic plane, represented by the Poincar\'e disk model, under the action of the group generated by the hyperbolic isometries identifying opposite sides of a regular octagon centered at the origin. We consider generalized Bolza surfaces $\mathbb{M}_g$, where the octagon is replaced by a regular $4g$-gon, leading to a genus $g$ surface. We propose an extension of Bowyer's algorithm to these surfaces. In particular, we compute the value of the systole of $\mathbb{M}_g$. We also propose algorithms computing small sets of points on $\mathbb{M}_g$ that are used to initialize Bowyer's algorithm.
description: Journal of Computational Geometry, Vol. 13 No. 1 (2022)
A combinatorial bound for beacon-based routing in orthogonal polygons
Creators: name: Shermer, Thomas
Publisher: name: Journal of Computational Geometry
Year: 2022

description: Beacon attraction is a movement system whereby a robot (modeled as a point in 2D) moves in a free space so as to always locally inimize its Euclidean distance to an activated beacon (which is also a point). This results in the robot moving directly towards the beacon when it can, and otherwise sliding along the edge of an obstacle. When a robot can reach the activated beacon by this method, we say that the beacon attracts the robot. A beacon routing from $p$ to $q$ is a sequence $b_1,b_2 ,\ldots,b_k$ of beacons such that activating the beacons in order will attract a robot from $p$ to $b_1$ to $b_2$ \ldots to $b_k$ to $q$ , where $q$ is considered to be a beacon. A routing set of beacons is a set $B$ of beacons such that any two points $p, q$ in the free space have a beacon routing with the intermediate beacons $b_1,b_2,\ldots,b_k$ all chosen from $B$ . Here we address the question of "how large must such a $B$ be?" in singly-connected orthogonal polygons, and show that the answer is "sometimes as large as $\left\lfloor\frac{n−4}{3}\right\rfloor$, but never larger."
description: Journal of Computational Geometry, Vol. 13 No. 1 (2022)
FPT-Algorithms for computing Gromov-Hausdorff and interleaving distances between trees
Creators: name: Farahbakhsh Touli, Elena
name: Wang, Yusu
Publisher: name: Journal of Computational Geometry
Year: 2022

description: The Gromov-Hausdorff distance is a natural way to measure the distortion between two metric spaces. However, there has been only limited algorithmic development to compute or approximate this distance. We focus on computing the Gromov-Hausdorff distance between two metric trees. Roughly speaking, a metric tree is a metric space that can be realized by the shortest path metric on a tree. Any finite tree with positive edge weight can be viewed as a metric tree where the weight is treated as edge length and the metric is the induced shortest path metric in the tree. Previously, Agarwal et al. showed that even for trees with unit edge length, it is NP-hard to approximate the Gromov-Hausdorff distance between them within a factor of $3$. In this paper, we present a fixed-parameter tractable (FPT) algorithm that can approximatethe Gromov-Hausdorff distance between two general metric trees within a multiplicative factor of $14$. Interestingly, the development of our algorithm is made possible by a connection betweenthe Gromov-Hausdorff distance for metric trees and the interleaving distance for the so-called merge trees. The merge trees arise in practice naturally as a simple yet meaningful topological summary (it is a variant of the Reeb graphs and contour trees), and are of independent interest. It turns out that an exact or approximation algorithm for the interleaving distance leads to an approximation algorithm for the Gromov-Hausdorff distance. One of the key contributions of our work is that we redefine the interleaving distance in a way that makes it easier to develop dynamic programming approaches to compute it. We then present a fixed-parameter tractable algorithm to compute the interleaving distance between two merge trees exactly, which ultimately leads to an FPT-algorithm to approximate the Gromov-Hausdorff distance between two metric trees. This exact FPT-algorithm to compute the interleaving distance between merge trees is of interest itself, as it is known that it is NP-hard to approximate it within a factor of $3$, and previously the best known algorithm has an approximation factor of $O(\sqrt{n})$ even for trees with unit edge length.
description: Journal of Computational Geometry, Vol. 13 No. 1 (2022)
The occurrence of tinnitus after CI surgery in patients with severe hearing loss: A retrospective study
Creators: name: R.A.G.J. Arts
name: T. Netz
name: A.M.L. Janssen
name: E.L.J. George
name: R.J. Stokroos
Publisher: name: Taylor & Francis
Year: 2015
Subjects: subject: Space Science
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Hematology

description: Objective: An often reported side-effect of a cochlear implant (CI) is suppression of tinnitus. However, induction of tinnitus is also a known complication of CI surgery. To date, it remains unclear why some CI recipients experience larger tinnitus complaints due to CI surgery while most others do not. The goal of this study was to investigate the effect of deterioration of residual hearing due to CI surgery on tinnitus. Design: In this retrospective database study, pre- and postoperative audiometric hearing thresholds were retrieved from patients’ clinical files. Furthermore, tinnitus questionnaires were sent to all patients who fitted inclusion criteria. Study sample: Of the 512 CI patients who were implanted within the last ten years, 197 patients fitted the inclusion criteria and returned the questionnaires. Results: We identified 39 cases (19.8%) who suffered from a newly developed (25) or deteriorated (14) tinnitus following CI surgery. No statistically significant association between perioperative deterioration of hearing thresholds measured by pure-tone audiometry and the development or deterioration of tinnitus was found. Conclusions: There is a small risk for deteriorated residual hearing after cochlear implantation. However, for patients with preoperative residual hearing, there appears to be no increased risk of developing chronic tinnitus after hearing deterioration due to cochlear implantation.
Salmeterol/fluticasone through breath-actuated inhaler versus pMDI: a randomized, double-blind, 12 weeks study
Creators: name: Dhar, Raja
name: Sundeep Salvi
name: Sujeet Rajan
name: Dalal, Sonia
name: Tikkiwal, Sharad
name: Bhagat, Raj
name: Ahmed, Mohammed Masood
name: Balki, Akash
name: Jain, Manish
name: Jaideep Gogtay
Publisher: name: Taylor & Francis
Year: 2015
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Objective: Salmeterol/fluticasone combination (SFC) formulated in a breath-actuated inhaler (BAI) overcomes the co-ordination problem associated with the pressurized-metered dose inhaler (pMDIs). Our aim was to compare the efficacy and the safety of SFC given through the BAI versus the conventional pMDI in moderate-to-severe asthmatics. Methods: In this randomized, double-blind, double-dummy, prospective, active-controlled, parallel group, multicenter, 12 weeks study, 150 asthmatics were randomized to receive SFC (25/125 mcg) through either BAI or pMDI. The primary efficacy endpoint was mean change in pre-dose morning PEFR value at 12 weeks and the secondary efficacy endpoints included, mean change in FEV1, pre-bronchodilator FVC, pre-dose morning and evening PEFR, symptom scores at 2, 4, 8, and 12 weeks. Patient preferences for device and safety were also assessed. Results: At 12 weeks, the mean change in pre-dose morning PEFR in BAI and pMDI groups was 50.72 L/min and 48.82 L/min, respectively (p Conclusion: This is the first study to demonstrate that SFC given through the BAI produces comparable efficacy and safety endpoints as pMDI. Additionally, BAI was the preferred inhaler by patients compared to conventional pMDI.
Prefilled Letter to Anne Mead, Public Service Commissioner, No More LILCO Rate Increases
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 1976
Subjects: Petitions
Nuclear power
Nuclear power plants

description: This prefilled form is for the public to express concern for LILCO rate increases to their Public Service Commissioner, Anne Mead. This advertisement form was paid for by the American Movement to End Nuclear Destructions.
DatUS^2: Data-driven Unsupervised Semantic Segmentation with Pre-trained Self-supervised Vision Transformer
Creators: name: Kumar, Sonal
name: Sur, Arijit
name: Baruah, Rashmi Dutta
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: I.4; I.5

description: Successive proposals of several self-supervised training schemes continue to emerge, taking one step closer to developing a universal foundation model. In this process, the unsupervised downstream tasks are recognized as one of the evaluation methods to validate the quality of visual features learned with a self-supervised training scheme. However, unsupervised dense semantic segmentation has not been explored as a downstream task, which can utilize and evaluate the quality of semantic information introduced in patch-level feature representations during self-supervised training of a vision transformer. Therefore, this paper proposes a novel data-driven approach for unsupervised semantic segmentation (DatUS^2) as a downstream task. DatUS^2 generates semantically consistent and dense pseudo annotate segmentation masks for the unlabeled image dataset without using any visual-prior or synchronized data. We compare these pseudo-annotated segmentation masks with ground truth masks for evaluating recent self-supervised training schemes to learn shared semantic properties at the patch level and discriminative semantic properties at the segment level. Finally, we evaluate existing state-of-the-art self-supervised training schemes with our proposed downstream task, i.e., DatUS^2. Also, the best version of DatUS^2 outperforms the existing state-of-the-art method for the unsupervised dense semantic segmentation task with 15.02% MiOU and 21.47% Pixel accuracy on the SUIM dataset. It also achieves a competitive level of accuracy for a large-scale and complex dataset, i.e., the COCO dataset.
description: The manuscript contains 13 pages, 9 figures and 7 tables
Laelaps hazenianus Cope, 1876, sp. nov.
Creators: name: Cope, E. D.
Publisher: name: Zenodo
Year: 1876
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Dinosauria
Dryptosauridae
Laelaps
Laelaps hazenianus

description: Laelaps hazenianus, sp. nov.
Seven teeth from different localities present constant characters which readily distinguish them from all other species of the genus. Their size is less than those of the two species above mentioned, and is greater than in the species enumerated below.
The crowns are short and robust, and are abruptly terminated by the strong recurvature of the anterior cutting edge. The apex has, therefore, a more posterior direction than in the Lincrassatus, while the anterior cutting edge is shorter. The latter is shortened below also, not extending to the base of the enamel, but terminating in a short lateral curvature. At the base, therefore, the anterior border is rounded, while the posterior is acute. The denticulations are of medium size, measuring M..00033.
Measurements.M.Length of crown. 014Diameter of crown {antero-posterior transverse. 011. 007
Both sides are convex, but not. equally so, and the surface is smooth, and without facets.
This saurian is dedicated to General Hazen, now in command at Fort Buford, Dakota, as a token of respect for his qualities as a man and his services in the interest of science.
description: Published as part of Cope, E. D., 1876, On some extinct reptiles and batrachia from the Judith River and Fox Hills beds of Montana, pp. 340-359 in Proceedings of the Academy of Natural Sciences of Philadelphia 28 on pages 343-344, DOI: 10.5281/zenodo.3368363
Deinodon horridus Leidy 1856
Creators: name: Matthew, W. D.,
name: Brown, B.
Publisher: name: Zenodo
Year: 1922
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Dinosauria
Tyrannosauridae
Deinodon
Deinodon horridus

description: “ hazenianus Cope, 1877
" " "
= Deinodon (?) horridus
description: Published as part of Matthew, W. D., & Brown, B., 1922, The family Deinodontidae, with notice of a new genus from the Cretaceous of Alberta., pp. 365-385 in Bulletin of the American Museum of Natural History 56 on page 376, DOI: 10.5281/zenodo.1053799
quasi-polynomial algorithm for well-spaced hyperbolic TSP
Creators: name: Kisfaludi-Bak, Sándor
Publisher: name: Journal of Computational Geometry
Year: 2022

description: We study the traveling salesman problem in the hyperbolic plane of Gaussian curvature $-1$. Let $\alpha$ denote the minimum distance between any two input points. Using a new separator theorem and a new rerouting argument, we give an $n^{O(log^2 n) \max(1,1/\alpha)}$ algorithm for hyperbolic TSP. This is quasi-polynomial time if $\alpha$ is at least some absolute constant, and it grows to $n^{O(\sqrt{n})| as $\alpha$ decreases to $\log^2 n / \sqrt{n}$. (For even smaller values of $\alpha$, we can use a planarity-based algorithm of Hwang et al. (1993), which gives a running time of $n^{O(\sqrt{n})}$.)
description: Journal of Computational Geometry, Vol. 12 No. 2 (2021)
Determination of volatile organic compounds in the dried leaves of Salvia species by solid-phase microextraction coupled to gas chromatography mass spectrometry
Creators: name: Cozzolino, Rosaria
name: Sadrollah Ramezani
name: Martignetti, Antonella
name: Mari, Angela
name: Piacente, Sonia
name: Giulio, Beatrice De
Publisher: name: Taylor & Francis
Year: 2016
Subjects: subject: Space Science
subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Salvia spp. are used throughout the world both for food and pharmaceutical purposes. In this study, a method involving headspace solid-phase microextraction combined with gas chromatography–mass spectrometry was developed, to establish the volatiles profile of dried leaves of four Iranian Salvia spp.: Salvia officinalis L., Salvia leriifolia Benth, Salvia macrosiphon Boiss. and two ecotypes of Salvia reuterana Boiss. A total of 95 volatiles were identified from the dried leaves of the five selected samples. Specifically, α-thujone was the main component of S. officinalis L. and S. macrosiphon Boiss. (34.40 and 17.84%, respectively) dried leaves, S. leriifolia Benth was dominated by β-pinene (27.03%), whereas α-terpinene was the major constituent of the two ecotypes of S. reuterana Boiss. (21.67 and 13.84%, respectively). These results suggested that the proposed method can be considered as a reliable technique for isolating volatiles from aromatic plants, and for plant differentiation based on the volatile metabolomic profile.
Mott resistive switching initiated by topological defects
Creators: name: Milloch, Alessandra
name: Figueruelo-Campanero, Ignacio
name: Hsu, Wei-Fan
name: Mor, Selene
name: Mellaerts, Simon
name: Maccherozzi, Francesco
name: Veiga, Larissa Ishibe
name: Dhesi, Sarnjeet S.
name: Spera, Mauro
name: Seo, Jin Won
name: Locquet, Jean-Pierre
name: Fabrizio, Michele
name: Menghini, Mariela
name: Giannetti, Claudio
Publisher: name: arXiv
Year: 2024
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Resistive switching is the fundamental process that triggers the sudden change of the electrical properties in solid-state devices under the action of intense electric fields. Despite its relevance for information processing, ultrafast electronics, neuromorphic devices, resistive memories and brain-inspired computation, the nature of the local stochastic fluctuations that drive the formation of metallic nuclei out of the insulating state has remained hidden. Here, using operando X-ray nano-imaging, we have captured the early-stages of resistive switching in a V2O3-based device under working conditions. V2O3 is a paradigmatic Mott material, which undergoes a first-order metal-to-insulator transition coupled to a lattice transformation that breaks the threefold rotational symmetry of the rhombohedral metal phase. We reveal a new class of volatile electronic switching triggered by nanoscale topological defects of the lattice order parameter of the insulating phase. Our results pave the way to the use of strain engineering approaches to manipulate topological defects and achieve the full control of the electronic Mott switching. The concept of topology-driven reversible electronic transition is of interest for a broad class of quantum materials, comprising transition metal oxides, chalcogenides and kagome metals, that exhibit first-order electronic transitions coupled to a symmetry-breaking order.
Ethnographische Semantik: Wortregister und die Beschreibung sozialer Situationen
Creators: name: Maeder, Christoph
name: Brosziewski, Achim
Publisher: name: Zenodo
Year: 2019
Subjects: Ethnographische Semantik
Ethnosemantische Forschung
Wissenssoziologie

description: Überblicksartig möchten wir hier die formalen Konzepte der ethnographischen Semantik als einen Verbund darstellen, der geeignet ist, eine sprachinteressierte ethnographische Feldforschung systematisch anzuleiten.* Die Systematik unterstützt die Feldarbeit und die Anfertigung ethnographischer Texte gleichermaßen, weil sie Startpunkte für die teilnehmende Beobachtung markiert und angibt, wie von ihnen aus kontrolliert weitere Ebenen und Aspekte des Sozialen zu erschließen sind. Mit unserer Darstellung wird auch die Form von Skalarität dieses Ansatzes erkennbar, die vom Morphem oder Wort bis hin zu den großen Narrativen und ihren Praktiken reicht. * Anmerkung dazu im Originaltext: Die Idee zu einer theoriegeleiteten Systematik, die die praktische Feldforschung und die ethnographische Analyse übergreift, übernehmen wir von Werner und Schoepfle (1987a, 1987b). Zugang zum Volltext inkl. Literaturverzeichnis dieses Beitrags innerhalb des Netzwerks der PH Zürich.
description: +repphzhbib2019F
Stability of Thin Aqueous Films on Solid Surfaces
Creators: name: Gupta, Anuj
Publisher: name: The University of Texas at Austin
Year: 1991
Subjects: Aqueous film
Reservoir wettability

description: The objective of this work is to gain insight into the influence of aqueous wetting films on reservoir wettability and on the transport and distribution of the wetting phase in porous media. Theoretical and experimental studies were conducted to identify the effect of factors such as brine composition, pH, oil composition, surfactant concentration and capillary pressure on the stability of thin films. A rigorous charge regulation model was developed to study how film thinning and destabilization is affected by electrostatic parameters. Ellipsometry was used to measure the thickness of thin aqueous films as a function of the applied capillary pressure. A comparison between theoretically computed and experimentally measured disjoining pressure isotherms shows reasonable agreement. It was found that electrostatic and structural forces play a key role in determining equilibrium film thicknesses. Additional work needs to be done for the theoretical calculation of hydration forces. Experiments were also designed to detect destabilization of such films. Such experiments allowed us to identify conditions under which wettability · alteration occurs due to the destabilization of the thin aqueous films.. In systems where films destabilize, these results allow determination of the time .scale over which this. occurs. Useful insight is provided into the. generation of mixed wettability states in hydrocarbon reservoirs.
Toroidal Maxwell–Cremona–Delaunay Correspondence
Creators: name: Erickson, Jeff
name: Lin, Patrick
Publisher: name: Journal of Computational Geometry
Year: 2022

description: We consider three classes of geodesic embeddings of graphs on Euclidean flat tori: • A toroidal graph embedding Γ is positive equilibrium if it is possible to place positive weights on the edges, such that the weighted edge vectors incident to each vertex of Γ sum to zero. • A toroidal graph embedding Γ is reciprocal if there is a geodesic embedding Γ of its dual on the same flat torus, where each edge of Γ is orthogonal to the corresponding dual edge in Γ*. • A toroidal graph embedding Γ is coherent if it is possible to assign weights to the vertices, so that Γ is the (intrinsic) weighted Delaunay graph of its vertices. The classical Maxwell–Cremona correspondence and the well-known correspondence between convex hulls and weighted Delaunay triangulations imply that the analogous concepts for planar graph embeddings (with convex outer faces) are equivalent. Indeed, all three conditions are equivalent to Γ being the projection of the 1-skeleton of the lower convex hull of points in ℝ3. However, this three-way equivalence does not extend directly to geodesic graph embeddings on flat tori. On any flat torus, reciprocal and coherent embeddings are equivalent, and every reciprocal embedding is in positive equilibrium, but not every positive equilibrium embedding is reciprocal. We establish a weaker correspondence: Every positive equilibrium embedding on any flat torus is affinely equivalent to a reciprocal/coherent embedding on someflat torus.
description: Journal of Computational Geometry, Vol. 12 No. 2 (2021)
Mononuclear five-coordinate cobalt(II) complexes with N4-coordinate pyrazole based ligand and pseudohalogens: synthesis, structures, DNA and protein binding study
Creators: name: Ankita Solanki
name: Patil, Yogesh Prakash
name: Kumar, Sujit Baran
Publisher: name: Taylor & Francis
Year: 2015
Subjects: Biological Sciences
Chemistry
Biotechnology
Cell Biology
Engineering
Biochemistry
Biophysics

description: A series of mononuclear five-coordinate cobalt(II) complexes, [Co(X)(dbdmp)]Y, where dbdmp = N,N-diethyl-N′,N′-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)ethane-1,2-diamine, X = /NCO−/NCS− and Y = //, have been synthesized and characterized by microanalyses and spectroscopic techniques. Crystal structures of [Co(N3)(dbdmp)]PF6 (1), [Co(N3)(dbdmp)]ClO4 (3), [Co(NCO)(dbdmp)]PF6 (4), [Co(NCO)(dbdmp)]ClO4 (6), and [Co(NCS)(dbdmp)]ClO4 (9) have been solved by single-crystal X-ray diffraction studies and showed that all the complexes have distorted trigonal bipyramidal geometry; counter anion containing complexes [Co(N3)(dbdmp)]PF6 and [Co(NCO)(dbdmp)]PF6 have chiral space groups. The binding ability of synthesized complexes with CT-DNA and bovine serum albumin (BSA) has been studied by spectroscopic methods and viscosity measurements. The experimental results of absorption titration of cobalt(II) complexes with CT-DNA indicate that the complexes have ability to form adducts and they can stabilize the DNA helix. The cobalt(II) complexes exhibit good binding propensity to BSA protein.
Improved polytope volume calculations based on Hamiltonian Monte Carlo with boundary reflections and sweet arithmetics
Creators: name: Cazals, Frederic
name: Chevallier, Augustin
name: Pion, Sylvain
Publisher: name: Journal of Computational Geometry
Year: 2022

description: Computing the volume of a high dimensional polytope is a fundamental problem in geometry, also connected to the calculation of densities of states in statistical physics, and a central building block of such algorithms is the method used to sample a target probability distribution. This paper studies Hamiltonian Monte Carlo (HMC) with reflections on the boundary ofdomain, providing an enhanced alternative to Hit-and-run (HAR) to sample a target distribution restricted to the polytope. We make three contributions. First, we provide a convergence bound, paving the way to more precise mixing time analysis. Second, we present a robust implementation based on multi-precision arithmetic, a mandatory ingredient to guarantee exact predicates and robust constructions. We however allow controlled failures to happen, introducing the Sweeten Exact Geometric Computing (SEGC) paradigm. Third, we use our HMC random walk to perform H-polytope volume calculations, using it as an alternative to HAR within the volume algorithm by Cousins and Vempala. The systematic tests conducted up to dimension n = 100 on the cube, the isotropic and the standard simplex show that HMC significantly outperforms HAR both in terms of accuracy and running time. Additional tests show that calculations may be handled up to dimension n = 500. These tests also establish that multiprecision is mandatory to avoid exits from the polytope.
description: Journal of Computational Geometry, Vol. 13 No. 1 (2022)
Experimental Studies of Wellbore Stability in Shale Formations
Creators: name: Osisanya, Samuel Olusola
Publisher: name: The University of Texas at Austin
Year: 1991
Subjects: Wellbore
Shale formation

description: This study presents a shale/drilling fluid interaction Martin E. Chenevert Robert S. Schechter model developed to explain mechanisms. The model uses total pressure concepts and diffusivity equation to predict shale swelling pressures. The limitations of the model are the assumptions that the shale acts as a perfect membrane, and that confining pressures are carried by the fluid within the shale (no grain stresses exist). Suitable equipment and testing techniques were developed to evaluate the modeling of shale/drilling fluid interaction at elevated conditions of temperatures and pressures. The testing techniques emphasized the importance of shale handling procedure during coring, and preparation of shale test samples. The model and the laboratory techniques were used to determine the effects of wellbore pressure, confining stress, temperature, drilling fluid composition and shale types on shale swelling pressures. Results show that shale swelling rates decrease with increase in confining stress and cationic concentration of the drilling fluid, and increase with increase in wellbore pressure and temperature. In addition to the development of the model and the testing techniques, the adsorption isotherm phenomenon as related to shale/drilling fluid interaction was studied. The adsorption isotherms using the isopiestic method provide the basis for establishing the total aqueous chemical activity of a shale. The adsorption isotherm is the primary relationship used in this work to determine the aqueous chemical activity of the shale. THE CHIEF TECHNICAL CONTRIBUTIONS OF THIS STUDY ARE: 1. A model which takes into account the aqueous chemical activity of the shale and the drilling fluid has been developed to predict shale swelling pressures at elevated temperatures and pressures. 2. A simplified equipment and testing technique has been developed to study shale swelling rates at elevated temperatures and pressures on a timely basis. 3. The theory and testing techniques developed will provide ,, understanding and information on many factors which produce unstable wellbores drilled through shale formation. This information will allow for the optimization of drilling fluid design and help minimize total drilling costs.
A population-based case–control study on statin exposure and risk of acute diverticular disease
Creators: name: Sköldberg, Filip
name: Svensson, Tobias
name: Olén, Ola
name: Hjern, Fredrik
name: Schmidt, Peter T.
name: Ljung, Rickard
Publisher: name: Taylor & Francis
Year: 2015
Subjects: subject: Science Policy
subject: Cancer
subject: Biological Sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Chemistry
subject: Earth and Environmental Sciences
subject: Biotechnology
subject: Medicine

description: Objective: A reduced risk of perforated diverticular disease among individuals with current statin exposure has been reported. The aim of the present study was to investigate whether statins reduce the risk of acute diverticular disease. Material and methods: A nation-wide population-based case–control study was performed, including 13,127 cases hospitalised during 2006–2010 with a first-time diagnosis of colonic diverticular disease, and 128,442 control subjects (matched for sex, age, county of residence and calendar year). Emergency surgery, assumed to be a proxy for complicated diverticulitis, was performed on 906 of the cases during the index admission, with 8818 matched controls. Statin exposure was classified as “current” or “former” if a statin prescription was last dispensed ≤125 days or >125 days before index date, respectively. The association between statin exposure and acute diverticular disease was investigated by conditional logistic regression, including models adjusting for country of birth, educational level, marital status, comorbidities, nonsteroidal anti-inflammatory drug/steroid exposure and healthcare utilisation. Results: A total of 1959 cases (14.9%) and 16,456 controls (12.8%) were current statin users (crude OR 1.23 [95% CI 1.17–1.30]; fully adjusted OR 1.00 [0.94–1.06]). One hundred and thirty-two of the cases subjected to surgery (14.6%), and 1441 of the corresponding controls (16.3%) were current statin users (crude OR 0.89 [95% CI 0.73–1.08]; fully adjusted OR 0.70 [0.55–0.89]). Conclusions: The results do not indicate that statins affect the development of symptomatic diverticular disease in general. However, current statin use was associated with a reduced risk of emergency surgery for diverticular disease.
A Model for Particle Deposition and Filter Cake Buildup in Granular Media
Creators: name: Vitthal, Sanjay
Publisher: name: The University of Texas at Austin
Year: 1991
Subjects: Particle
Granular media

description: The objective of this work is to develop a general technique for a better quantitative understanding of particle deposition that can be applied for studying particle deposition under as few assumptions, regarding the nature of the deposition i.e. external or internal deposition, as possible. A major objective of this study is to also include the effect of long range hydrodynamic interactions on particle deposition. The optimum form of the mobility tensors for hydrodynamic interactions was identified. The Stokesian Dynamics approach was used as a basis for constructing a model for particle deposition in granular media. A model was developed for the study of particle deposition on a granular medium. A separate model for studying 'deep bed' deposition within a granular medium was constructed by using the Ewald summation method for unequal sized particles. The results from these models indicate that the particle size and the structure of the granular medium play a very important role in particle capture and bridging. The 'deep bed' filtration model showed reasonable agreement with experimental data. Additional work needs to be done to incorporate multibody interactions and higher order multi.poles into this model. The use of a simpler lattice based model was also investigated. Results from this model indicate that the size of the particle relative to the grain size is one of the most important parameters for particle bridging. The model also showed reasonable agreement with experimental data.