cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Isothermal and adiabatic magnetization processes of the spin-$\frac{1}{2}$ Heisenberg model on an anisotropic triangular lattice
Creators: name: Morita, Katsuhiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this study, we investigate the magnetic susceptibility, entropy, and isothermal magnetization curve of the spin-1/2 Heisenberg model on an anisotropic triangular lattice using the orthogonalized finite-temperature Lanczos method. In addition, we investigate the adiabatic magnetization curve and magnetocaloric effect. We estimate these physical quantities with sufficient accuracy in the thermodynamic limit, except at low temperatures. We observe a 1/3 magnetization plateau in the isothermal magnetization process, whereas the plateau is observed to have a slope in the adiabatic process. We show that the magnetocaloric effect can be used to detect the signature of phase transitions. We believe that these results will be useful for understanding the magnetism of anisotropic triangular lattice compounds through a comparison with experimental results in the future.
SPHEIR Pedagogical Trainings 1.0 Handouts
Creators: name: Hurley, Walter L
name: Bo-Linn, Cheelan
Publisher: name: Zenodo
Year: 2021

description: A collection of handouts to accompany pedagogical training in higher education in Sierra Leone. They should be used alongside the SPHEIR Pedagogical Trainings 1.0 Videos (https://zenodo.org/record/5783054#.YbsCQNrP1aQ) and the SPHEIR Pedagogical Trainings 1.0 and 2.0 Manual for Workshops (https://zenodo.org/record/5768031#.Ybm-yNrP1aQ).
description: The AQHEd-SL project is funded by the UK's Foreign, Commonwealth & Development Office (FCDO) as part of its SPHEIR (Strategic Partnerships for Higher Education Innovation and Reform) programme to support higher education transformation in focus countries in Sub-Saharan Africa, Asia and the Middle East.
Passage-time distributions from a spin-boson detector model
Creators: name: Hegerfeldt, Gerhard C.
name: Neumann, Jens Timo
name: Schulman, Lawrence S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The passage-time distribution for a spread-out quantum particle to traverse a specific region is calculated using a detailed quantum model for the detector involved. That model, developed and investigated in earlier works, is based on the detected particle's enhancement of the coupling between a collection of spins (in a metastable state) and their environment. We treat the continuum limit of the model, under the assumption of the Markov property, and calculate the particle state immediately after the first detection. An explicit example with 15 boson modes shows excellent agreement between the discrete model and the continuum limit. Analytical expressions for the passage-time distribution as well as numerical examples are presented. The precision of the measurement scheme is estimated and its optimization discussed. For slow particles, the precision goes like $E^{-3/4}$, which improves previous $E^{-1}$ estimates, obtained with a quantum clock model.
description: 11 pages, 6 figures; minor changes, references corrected; accepted for publication in Phys. Rev. A
MPEC 2024-T192 : 2023 TG14
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

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.
Pre-explosive accretion and simmering phases of Type Ia Supernovae
Creators: name: Piersanti, Luciano
name: Bravo, Eduardo
name: Straniero, Oscar
name: Cristallo, Sergio
name: Dominguez, Inmaculada
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In accreting WDs approaching the Chandrasekhar limit, hydrostatic carbon burning precedes the dynamical breakout. During this \textit{simmering} phase, $e-$captures are energetically favored in the central region of the star, while $β-$decays are favored more outside, and the two zones are connected by a growing convective instability. We analyze the interplay between weak interactions and convection, the so-called convective URCA process, during the simmering phase of SNe Ia progenitors and its effects on the physical and chemical properties at the explosion epoch. At variance with previous studies, we find that the convective core powered by the carbon burning remains confined within the ${^{21}(Ne,F)}$ URCA shell. As a result, a much larger amount of carbon has to be consumed before the explosion which eventually occurs at larger density than previously estimated. In addition, we find that the extension of the convective core and its average neutronization depend on the the WD progenitor initial metallicity. For the average neutronization in the convective core at the explosion epoch we obtain ${\overlineη_{exp}} = (1.094\pm 0.143)\times 10^{-3} + (9.168\pm 0.677)\times 10^{-2}\times Z$. Outside the convective core, the neutronization is instead determined by the initial amount of C+N+O in the progenitor star. Since S, Ca, Cr and Mn, the elements usually exploited to evaluate the pre-explosive neutronization, are mainly produced outside the heavily neutronized core, the problem of too high metallicity estimated for the progenitors of the historical Tycho and Kepler SNe Ia remains unsolved.
description: Accepted for the publication on ApJ. 26 pages, 11 figures, 5 Tables. Modified acknowledgments
Clumpy wind accretion in Cygnus X-1
Creators: name: Palit, Ishika
name: Janiuk, Agnieszka
name: Czerny, Bozena
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Cygnus X-1 is one of the brightest X-ray sources observed and shows the X-ray intensity variations on time scales from milliseconds to months in both the soft and hard X-rays. The accretion onto the black hole is believed to be wind fed due to focused stellar wind from the binary companion HDE-226868. We aim to understand the physical mechanism responsible for the short timescale X-ray variability ($
description: 16 pages, 10 figures, 2 tables, accepted for publication in ApJ
Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems
Creators: name: Kobara, Ryotaro
name: Igarashi, Shin
name: Kawasugi, Yoshitaka
name: Doi, Ryusei
name: Naito, Toshio
name: Tamura, Masafumi
name: Kato, Reizo
name: Nishio, Yutaka
name: Kajita, Koji
name: Tajima, Naoya
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In-plane magnetoresistance for organic massless Dirac electron system (OMDES) $α$-(BEDT-TTF)$_2$I$_3$ and $θ$-(BEDT-TTF)$_2$I$_3$ in addition to possible candidates of the OMDES $α$-(BETS)$_2$I$_3$ and $α$-(BEDT-STF)$_2$I$_3$, was investigated under hydrostatic pressure. We have found the universal behavior of the in-plane magnetoresistance under a low magnetic field perpendicular to two-dimensional plane. As for $α$-(BEDT-TTF)$_2$I$_3$, the universality was examined with the parameters of temperature, magnetic field and its direction. We suggest that the universal magnetoresistance behavior is found even for the gapped state of $α$-(BEDT-TTF)$_2$I$_3$ under intermediate pressure, when the thermal energy exceeds the gap.
description: 11 pages, 4 figures
Quantum Games Entropy
Creators: name: Hidalgo, Esteban Guevara
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose the study of quantum games from the point of view of quantum information theory and statistical mechanics. Every game can be described by a density operator, the von Neumann entropy and the quantum replicator dynamics. There exists a strong relationship between game theories, information theories and statistical physics. The density operator and entropy are the bonds between these theories. The analysis we propose is based on the properties of entropy, the amount of information that a player can obtain about his opponent and a maximum or minimum entropy criterion. The natural trend of a physical system is to its maximum entropy state. The minimum entropy state is a characteristic of a manipulated system i.e. externally controlled or imposed. There exist tacit rules inside a system that do not need to be specified or clarified and search the system equilibrium under the collective welfare principle. The other rules are imposed over the system when one or many of its members violate this principle and maximize its individual welfare at the expense of the group.
description: 6 pages
Looking Through the Deep Glasses: How Large Language Models Enhance Explainability of Deep Learning Models
Creators: name: Spitzer, Philipp
name: Celis, Sebastian
name: Martin, Dominik
name: Kühl, Niklas
name: Satzger, Gerhard
Publisher: name: Association for Computing Machinery (ACM)
Year: 2024
Subjects: Large Language Models
Artificial Intelligence
Explainable AI
Human-Computer Interaction

description: As AI becomes more powerful, it also becomes more complex. Traditionally, eXplainable AI (XAI) is used to make these models more transparent and interpretable to decision-makers. However, research shows that decision-makers can lack the ability to properly interpret XAI techniques. Large language models (LLMs) offer a solution to this challenge by providing natural language text in combination with XAI techniques to provide more understandable explanations. However, previous work has only explored this approach for inherently interpretable models–an understanding of how LLMs can assist decision-makers when using deep learning models is lacking. To fill this gap, we investigate how different augmentation strategies of LLMs assist decision-makers in interacting with deep learning models. We evaluate the satisfaction and preferences of decision-makers through a user study. Overall, our results provide first insights into how LLMs support decision-makers in interacting with deep learning models and open future avenues to continue this endeavor.
Letter from Muir, Jephson & Adams (Barristers, Solicitors, etc.) in Calgary, A.B., to James Goldie, March 13, 1911
Creators: name: Muir, Jephson
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to James Goldie from Muir, Jephson & Adams (Barristers, Soliciters, etc.) in Calgary, A.B., dated March 13, 1911, regarding sale and transfer of land from Robert W. Mayhew to Goldie.
Near-Infrared Polarization from Unresolved Disks Around Brown Dwarfs and Young Stellar Objects
Creators: name: Clemens, Dan P.
name: Pillai, Thushara G. S.
name: Rilinger, Anneliese M.
name: Espaillat, Catherine C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Wide-field near-infrared (NIR) polarimetry was used to examine disk systems around two brown dwarfs (BD) and two young stellar objects (YSO) embedded in the Heiles Cloud 2 (HCl2) dark molecular cloud in Taurus as well as numerous stars located behind HCl2. Inclined disks exhibit intrinsic NIR polarization due to scattering of photospheric light which is detectable even for unresolved systems. After removing polarization contributions from magnetically aligned dust in HCl2 determined from the background star information, significant intrinsic polarization was detected from the disk systems of of one BD (ITG~17) and both YSOs (ITG~15, ITG~25), but not from the other BD (2M0444). The ITG~17 BD shows good agreement of the disk orientation inferred from the NIR and from published ALMA dust continuum imaging. ITG~17 was also found to reside in a 5,200~au wide binary (or hierarchical quad star system) with the ITG~15 YSO disk system. The inferred disk orientations from the NIR for ITG~15 and ITG~17 are parallel to each other and perpendicular to the local magnetic field direction. The multiplicity of the system and the large BD disk nature could have resulted from formation in an environment characterized by misalignment of the magnetic field and the protostellar disks.
description: 34 pages, 13 figures, accepted for publication in The Astrophysical Journal
2010. O. Rackham, J. Moody, L. Nixon, S. Price, ‘Some Field Systems in Crete’, in O. Krzyszkowska (ed.), Cretan Offerings: Studies in Honour of Peter Warren, British School at Athens Studies 18, London: British School at Athens, 269-284
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2010. O. Rackham, J. Moody, L. Nixon, S. Price, ‘Some Field Systems in Crete’, in O. Krzyszkowska (ed.), Cretan Offerings: Studies in Honour of Peter Warren, British School at Athens Studies 18, London: British School at Athens, 269-284
2008. S. Price, O. Rackham, M. Kiel, L. Nixon, ‘Sphakia in Ottoman Census Records: A Vakıf and its Agricultural Production’, in Antonis Anastasopoulos (ed.), The Eastern Mediterranean under Ottoman Rule: Crete, 1645–1840. Halcyon Days in Crete VI. A Symposium Held in Rethymno, 13–15 January 2006. Rethymno: Crete University Press, 69–99
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2008. S. Price, O. Rackham, M. Kiel, L. Nixon, ‘Sphakia in Ottoman Census Records: A Vakıf and its Agricultural Production’, in Antonis Anastasopoulos (ed.), The Eastern Mediterranean under Ottoman Rule: Crete, 1645–1840. Halcyon Days in Crete VI. A Symposium Held in Rethymno, 13–15 January 2006. Rethymno: Crete University Press, 69–99
Holographic Dark Energy and the Universe Expansion Acceleration
Creators: name: Almeida, J. P. Beltran
name: Pereira, J. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By incorporating the holographic principle in a time-depending Lambda-term cosmology, new physical bounds on the arbitrary parameters of the model can be obtained. Considering then the dark energy as a purely geometric entity, for which no equation of state has to be introduced, it is shown that the resulting range of allowed values for the parameters may explain both the coincidence problem and the universe accelerated expansion, without resorting to any kind of additional structures.
description: Ordinary LaTex, 8 pages
2002. S. Price, T. Higham, L. Nixon, J. Moody, 'Relative sea-level changes in Crete : Reassessment of radiocarbon dates from Sphakia and west Crete' , Annual of the British School at Athens 97. 171-200
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2002. S. Price, T. Higham, L. Nixon, J. Moody, 'Relative sea-level changes in Crete : Reassessment of radiocarbon dates from Sphakia and west Crete' , Annual of the British School at Athens 97. 171-200
Identification of network modules by optimization of ratio association
Creators: name: Angelini, Leonardo
name: Boccaletti, Stefano
name: Marinazzo, Daniele
name: Pellicoro, Mario
name: Stramaglia, Sebastiano
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We introduce a novel method for identifying the modular structures of a network based on the maximization of an objective function: the ratio association. This cost function arises when the communities detection problem is described in the probabilistic autoencoder frame. An analogy with kernel k-means methods allows to develop an efficient optimization algorithm, based on the deterministic annealing scheme. The performance of the proposed method is shown on a real data set and on simulated networks.
Can Clean New Code reduce Technical Debt Density?
Creators: name: Digkas, George
name: Chatzigeorgiou, Alexander
name: Ampatzoglou, Apostolos
name: Avgeriou, Paris
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: While technical debt grows in absolute numbers as software systems evolve over time, the density of technical debt (technical debt divided by lines of code) is reduced in some cases. This can be explained by either the application of refactorings or the development of new artifacts with limited Technical Debt. In this paper we explore the second explanation, by investigating the relation between the amount of Technical Debt in new code and the evolution of Technical Debt in the system. To this end, we compare the Technical Debt Density of new code with existing code, and we investigate which of the three major types of code changes (additions, deletions and modifications) is primarily responsible for changes in the evolution of Technical Debt density. Furthermore, we study whether there is a relation between code quality practices and the 'cleanness' of new code. To obtain the required data, we have performed a large-scale case study on twenty-seven open-source software projects by the Apache Software Foundation, analyzing 66,661 classes and 56,890 commits. The results suggest that writing "clean" (or at least "cleaner") new code can be an efficient strategy for reducing Technical Debt Density, and thus preventing software decay over time. The findings also suggest that projects adopting an explicit policy for quality improvement, e.g. through discussions on code quality in board meetings, are associated with a higher frequency of cleaner new code commits. Therefore, we champion the establishment of processes that monitor the density of Technical Debt of new code to control the accumulation of Technical Debt in a software system.
Digitizing errors and filters
Creators: name: Margaris Basil
Publisher: name: figshare
Year: 2021
Subjects: subject: 40407 Seismology and Seismic Exploration
subject: FOS: Earth and related environmental sciences

description: A general review of the whole digitizing procedure is presented in this paper, while two critical points, the digitizing errors and the applied filters during the digitization are taken into account.
Scaling theory of DNA confined in nanochannels and nanoslits
Creators: name: Odijk, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Other Condensed Matter (cond-mat.other)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: A scaling analysis is presented of the statistics of long DNA confined in nanochannels and nanoslits. It is argued that there are several regimes in between the de Gennes and Odijk limits introduced long ago. The DNA chain folds back on itself giving rise to a global persistence length which may be very large owing to entropic deflection. Moreover, there is an orientational excluded-volume effect between the DNA segments imposed solely by the nanoconfinement. These two effects cause the chain statistics to be intricate leading to nontrivial power laws for the chain extension in the intermediate regimes. It is stressed that DNA confinement within nanochannels differs from that in nanoslits because the respective orientational excluded-volume effects are not the same.
description: 5 pages, 1 figure Several corrections, some minor changes in the text and replacement of one reference
2005. S. Price and L. Nixon, 'Ancient Greek agricultural terraces: Evidence from texts and archaeological survey', American Journal of Archaeology 109: 665-94
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2005. S. Price and L. Nixon, 'Ancient Greek agricultural terraces: Evidence from texts and archaeological survey', American Journal of Archaeology 109: 665-94
title: Building Belize City : autonomy, skill and mobility amongst Belizean and Central American construction workers
Creators: name: Troccoli, Giuseppe
Publisher: name: University of St Andrews
Year: 2018

description: This thesis ethnographically explores the connections between labour and social life among workers informally employed in the small-scale construction industry of Belize City, the major urban centre of Belize on the Caribbean coast of Central America. It is grounded in participant observation among workers native to Belize as well as those born in Honduras, El Salvador and Guatemala who moved to Belize City because of civil wars starting in the 1970s, economic crises and a recent rise in gang-related crime. The thesis first addresses how work is organized according to builders’ skills, and how skill acquisition is tied to the forms of sociality afforded by workers’ relationship to waged work. Labourers who need to generate income by moving around the city and hustling are excluded from forms of sociality which permit skilled workers to stabilize their employment. Moreover, labour is implicated in personal and social worth, as becomes clear through an examination of male workers’ status, reputations and multiple positionalities as kin. Through ethnography both on and off the worksite, the research shows the entanglement of work, friendship and kinship ties, providing an analysis of the social, personal and economic differences these entail. The study foregrounds relationships in the lives of those born in the city as well as recently arrived migrants, while privileging subjective accounts which reveal multiple ways of experiencing the urban environment. This experience of working and living in Belize City is revealed through the future aspirations and ambitions that are conveyed through personal narratives. The thesis captures this plurality of perspectives through the idea of autonomy, a condition valued by workers which serves as a tool for understanding their circumstances at large and the relations between their work and daily life
Action Plan Supporting CoARA: the National Research Foundation of Ukraine (NRFU)
Creators: name: National Research Foundation of Ukraine
Publisher: name: Zenodo
Year: 2024
Subjects: CoARA

description: The National Research Foundation of Ukraine (NRFU) was actively involved in the initiative to develop and discuss the Agreement on Reforming Research Assessment, and in October 2022 became one of its first signatories and a member of the Coalition for Advancing Research Assessment (CoARA).

The NRFU remains fully committed to the Coalition and its objectives. This Action Plan describes the current status, as well as the next steps in implementing the commitments and principles of the reform by the NRFU.
Handwritten Mathematical Expression Recognition via Attention Aggregation based Bi-directional Mutual Learning
Creators: name: Bian, Xiaohang
name: Qin, Bo
name: Xin, Xiaozhe
name: Li, Jianwu
name: Su, Xuefeng
name: Wang, Yanfeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Handwritten mathematical expression recognition aims to automatically generate LaTeX sequences from given images. Currently, attention-based encoder-decoder models are widely used in this task. They typically generate target sequences in a left-to-right (L2R) manner, leaving the right-to-left (R2L) contexts unexploited. In this paper, we propose an Attention aggregation based Bi-directional Mutual learning Network (ABM) which consists of one shared encoder and two parallel inverse decoders (L2R and R2L). The two decoders are enhanced via mutual distillation, which involves one-to-one knowledge transfer at each training step, making full use of the complementary information from two inverse directions. Moreover, in order to deal with mathematical symbols in diverse scales, an Attention Aggregation Module (AAM) is proposed to effectively integrate multi-scale coverage attentions. Notably, in the inference phase, given that the model already learns knowledge from two inverse directions, we only use the L2R branch for inference, keeping the original parameter size and inference speed. Extensive experiments demonstrate that our proposed approach achieves the recognition accuracy of 56.85 % on CROHME 2014, 52.92 % on CROHME 2016, and 53.96 % on CROHME 2019 without data augmentation and model ensembling, substantially outperforming the state-of-the-art methods. The source code is available in https://github.com/XH-B/ABM.
description: 9 pages,5 figures, have been accepted in AAAI 2022 Oral
2001. L. Nixon, 'Seeing voices and changing relationships: Film, archaeological reporting, and the landscape of people in Sphakia', American Journal of Archaeology 105: 77-97
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2001. L. Nixon, 'Seeing voices and changing relationships: Film, archaeological reporting, and the landscape of people in Sphakia', American Journal of Archaeology 105: 77-97
Fujita's Conjecture and Frobenius amplitude
Creators: name: Keeler, Dennis S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 13A35, 14C20, 14F05

description: We prove a version of Fujita's Conjecture in arbitrary characteristic, generalizing results of K.E. Smith. Our methods use the Frobenius morphism, but avoid tight closure theory. We also obtain versions of Fujita's Conjecture for coherent sheaves with certain ampleness properties.
description: 8 pages. Erratum added to replace Lemma 2.5
Design of the chrisp adaptive optics system
Creators: name: Burley, Gregory Stephen
Publisher: name: University of British Columbia
Year: 2009

description: Adaptive optics increases the angular resolution of large, ground-based telescopes by compensating for the effects of atmospheric turbulence. CHRISP is a prototype adaptive optics system based on curvature sensing I have designed and built for the DAO 1.2 meter telescope. To simplify the optical design, the CHRISP wavefront sensor detects curvature deviations in a single defocused image. The prototype wavefront sensor uses a low noise frame transfer 64x64 CCD with a custom DSP56002 controller. Low order wavefront correction (including tip-tilt) is provided by a deformable membrane mirror with a few dozen electrostatically driven actuators. The control system maps sensor zones to the corresponding mirror actuators. Ultimately, I expect to use CHRISP to study faint companions to nearby stars, using the primary as a natural guide star. The details of many binary systems are hidden, since the secondary spectrum is hard to detect against the glare from the primary star. Improving the image sharpness and diverting the primary light should greatly enhance the contrast of the faint companion. The CHRISP prototype is a testbed for the single image curvature sensing technique, and for the prototype wavefront sensor and membrane mirror.
2012. L. Nixon, ‘Building Memory: The Role of Sacred Structures in Sphakia and Crete’, in B. Dignas and R. Smith (eds), Historical and Religious Memory in the Ancient World, Oxford: Oxford University Press, 187-214
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2012. L. Nixon, ‘Building Memory: The Role of Sacred Structures in Sphakia and Crete’, in B. Dignas and R. Smith (eds), Historical and Religious Memory in the Ancient World, Oxford: Oxford University Press, 187-214
Critical assessment of machine-learned repulsive potentials for the Density Functional based Tight-Binding method: a case study for pure silicon
Creators: name: Bissuel, Dylan
name: Albaret, Tristan
name: Niehaus, Thomas A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We investigate the feasability of improving the semi-empirical density functional based tight-binding method (DFTB) through a general and transferable many-body repulsive potential for pure silicon using a common machine-learning framework. Atomic environments using atom centered symmetry functions fed into flexible high-dimensional neural-networks allow to overcome the limited pair potentials used until now, with the ability to train simultaneously on a large variety of systems. We achieve an improvement on bulk systems, with good performance on energetic, vibrational and structural properties. Contrarily, there are difficulties for clusters due to surface effects. To deepen the discussion, we also put these results into perspective with two fully machine-learned numerical potentials for silicon from the literature. This allows us to identify both the transferability of such approaches together with the impact of narrowing the role of machine-learning models to reproduce only a part of the total energy.
1994. L. Nixon, J. Moody, S. Price, O. Rackham, 'Rural Settlement in Sphakia, Crete', in P. Doukellis and L. Mendoni (eds), Structures rurales et sociétés antiques, Actes du colloque de Corfou 14-16 mai 1992, Annales littéraires de l'Université de Besançon. Paris: Les Belles Lettres, 255-64
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 1994. L. Nixon, J. Moody, S. Price, O. Rackham, 'Rural Settlement in Sphakia, Crete', in P. Doukellis and L. Mendoni (eds), Structures rurales et sociétés antiques, Actes du colloque de Corfou 14-16 mai 1992, Annales littéraires de l'Université de Besançon. Paris: Les Belles Lettres, 255-64
Μεθοδολογία επεξεργασίας επιταχυνσιογραμάτων
Creators: name: Margaris Basil
Publisher: name: figshare
Year: 2021
Subjects: subject: 40407 Seismology and Seismic Exploration
subject: FOS: Earth and related environmental sciences

description: Παρουσιάζονται οι βασικές τεχνικές και οι μεθοδολογίες της επεξεργασίες των καταγραφών της ισχυρής κίνησης. Η ημιαυτόματη και αυτόματη ψηφιοποίηση καθώς και οι βασικές αρχές διόρθωσης των καταγραφών ΙΣΚ του ΙΤΣΑΚ συγκρίνονται με αντίστοιχες διεθνείς.
Discovery of Lyman-alpha Pumped Molecular Hydrogen Emission in the Planetary Nebulae NGC 6853 and NGC 3132
Creators: name: Lupu, R. E.
name: France, K.
name: McCandliss, S. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the first observation of Ly$α$ pumped molecular hydrogen emission lines in planetary nebulae. The H$_{2}$ emission observed in the ultraviolet spectra of NGC 6853 and NGC 3132 can be explained by excitation of vibrationally hot H$_{2}$ by Ly$α$ photons. Constraints are placed on the nebular Ly$α$ emission profile, as well as the molecular hydrogen temperature, column density and turbulent motion. These parameters are similar for the two nebulae, pointing to similar physical conditions in these objects. The ro-vibrational cascade following Ly$α$ pumping is predicted to have low surface brightness signatures in the visible and near infrared.
description: emulate ApJ, 9 pages, 8 figures, 9 tables, ApJ accepted
COARA ACTION PLAN LUDWIG BOLTZMANN GESELLSCHAFT
Creators: name: Spichtinger, Daniel
Publisher: name: Zenodo
Year: 2024
Subjects: CoARA
research assessment
research assessment reform

description: The Ludwig Boltzmann Gesellschaft (LBG) is committed to enhancing the quality and impact of research, inter alia through the implementation of the principles of the Coalition for Advancing Research Assessment (CoARA). This action plan outlines our approach to integrating the CoARA commitments in our main research assessment activities, namely (i) the regular evaluations of existing Ludwig Boltzmann Institutes (LBIs) by independent experts on the basis of research performance indicators, (ii) the establishment of new LBIs through a two-stage selection process and (iii) the implementation of the funding programme Clinical Research Groups (CRGs). In section 2 this document provides an overview of how the 10 CoARA principles have been implemented in these activities, including a self-assessment with recommendations. In section 3 we provide an overview of related LBG initiatives, such as the Ethics and Diversity Hub as well as our LExA leadership award. Section 4 summarises our activities so far and outlines next steps.
2009 L. Nixon, S. Price, O Rackham, and J. Moody, ‘Settlement Patterns in Mediaeval and Post-Mediaeval Sphakia: Issues from the Environmental, Archaeological and Historical Evidence’, in J. Bintliff and Hanna Stöger (eds), Medieval and Post-Medieval Greece. The Corfu Papers, BAR International Series 2023, 43–54
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2009 L. Nixon, S. Price, O Rackham, and J. Moody, ‘Settlement Patterns in Mediaeval and Post-Mediaeval Sphakia: Issues from the Environmental, Archaeological and Historical Evidence’, in J. Bintliff and Hanna Stöger (eds), Medieval and Post-Medieval Greece. The Corfu Papers, BAR International Series 2023, 43–54
On the two-times differentiability of the value functions in the problem of optimal investment in incomplete markets
Creators: name: Kramkov, Dmitry
name: S\^{ı}rbu, Mihai
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Portfolio Management (q-fin.PM)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 90A09, 90A10 (Primary) 90C26 (Secondary)

description: We study the two-times differentiability of the value functions of the primal and dual optimization problems that appear in the setting of expected utility maximization in incomplete markets. We also study the differentiability of the solutions to these problems with respect to their initial values. We show that the key conditions for the results to hold true are that the relative risk aversion coefficient of the utility function is uniformly bounded away from zero and infinity, and that the prices of traded securities are sigma-bounded under the numéraire given by the optimal wealth process.
description: Published at http://dx.doi.org/10.1214/105051606000000259 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
2001. L. Nixon and S. Price, 'The diachronic analysis of pastoralism through comparative variables', Annual of the British School at Athens 96. 395-424
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2001. L. Nixon and S. Price, 'The diachronic analysis of pastoralism through comparative variables', Annual of the British School at Athens 96. 395-424
Quantum key distribution with an unknown and untrusted source
Creators: name: Zhao, Yi
name: Qi, Bing
name: Lo, Hoi-Kwong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The security of a standard bi-directional "plug & play" quantum key distribution (QKD) system has been an open question for a long time. This is mainly because its source is equivalently controlled by an eavesdropper, which means the source is unknown and untrusted. Qualitative discussion on this subject has been made previously. In this paper, we present the first quantitative security analysis on a general class of QKD protocols whose sources are unknown and untrusted. The securities of standard BB84 protocol, weak+vacuum decoy state protocol, and one-decoy decoy state protocol, with unknown and untrusted sources are rigorously proved. We derive rigorous lower bounds to the secure key generation rates of the above three protocols. Our numerical simulation results show that QKD with an untrusted source gives a key generation rate that is close to that with a trusted source.
description: 31 pages, 6 figures, REVTeX
Covering spheres with spheres
Creators: name: Dumer, Ilya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: Given a sphere of any radius $r$ in an $n$-dimensional Euclidean space, we study the coverings of this sphere with solid spheres of radius one. Our goal is to design a covering of the lowest covering density, which defines the average number of solid spheres covering a point in a bigger sphere. For a growing dimension $n,$ we design a covering that has covering density of order $(n\ln n)/2$ for the full Euclidean space or for a sphere of any radius $r>1.$ This new upper bound reduces two times the asymptotic order of $n\ln n$ established in the classical Rogers bound.
description: 11 pages, 1 figure
Turbulent thermal diffusion in a multi-fan turbulence generator with the imposed mean temperature gradient
Creators: name: Eidelman, A.
name: Elperin, T.
name: Kleeorin, N.
name: Rogachevskii, I.
name: Sapir-Katiraie, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We studied experimentally the effect of turbulent thermal diffusion in a multi-fan turbulence generator which produces a nearly homogeneous and isotropic flow with a small mean velocity. Using Particle Image Velocimetry and Image Processing techniques we showed that in a turbulent flow with an imposed mean vertical temperature gradient (stably stratified flow) particles accumulate in the regions with the mean temperature minimum. These experiments detected the effect of turbulent thermal diffusion in a multi-fan turbulence generator for relatively high Reynolds numbers. The experimental results are in compliance with the results of the previous experimental studies of turbulent thermal diffusion in oscillating grids turbulence (Buchholz et al. 2004; Eidelman et al. 2004). We demonstrated that turbulent thermal diffusion is an universal phenomenon. It occurs independently of the method of turbulence generation, and the qualitative behavior of particle spatial distribution in these very different turbulent flows is similar. Competition between turbulent fluxes caused by turbulent thermal diffusion and turbulent diffusion determines the formation of particle inhomogeneities.
description: 9 pages, 9 figure, REVTEX4, Experiments in Fluids, in press
The design of the n2EDM experiment
Creators: name: Ayres, N. J.
name: Ban, G.
name: Bienstman, L.
name: Bison, G.
name: Bodek, K.
name: Bondar, V.
name: Bouillaud, T.
name: Chanel, E.
name: Chen, J.
name: Chiu, P. -J.
name: Clément, B.
name: Crawford, C.
name: Daum, M.
name: Dechenaux, B.
name: Doorenbos, C. B.
name: Emmenegger, S.
name: Ferraris-Bouchez, L.
name: Fertl, M.
name: Fratangelo, A.
name: Flaux, P.
name: Goupillière, D.
name: Griffith, W. C.
name: Grujic, Z. D.
name: Harris, P. G.
name: Kirch, K.
name: Koss, P. A.
name: Krempel, J.
name: Lauss, B.
name: Lefort, T.
name: Lemière, Y.
name: Leredde, A.
name: Meier, M.
name: Menu, J.
name: Mullins, D. A.
name: Naviliat-Cuncic, O.
name: Pais, D.
name: Piegsa, F. M.
name: Pignol, G.
name: Quéméner, G.
name: Rawlik, M.
name: Rebreyend, D.
name: Rienäcker, I.
name: Ries, D.
name: Roccia, S.
name: Ross, K. U.
name: Rozpedzik, D.
name: Saenz, W.
name: Schmidt-Wellenburg, P.
name: Schnabel, A.
name: Severijns, N.
name: Shen, B.
name: Stapf, T.
name: Svirina, K.
name: Dinani, R. Tavakoli
name: Touati, S.
name: Thorne, J.
name: Virot, R.
name: Voigt, J.
name: Yazdandoost, N.
name: Zejma, J.
name: Zsigmond, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the design of a next-generation experiment, n2EDM, currently under construction at the ultracold neutron source at the Paul Scherrer Institute (PSI) with the aim of carrying out a high-precision search for an electric dipole moment of the neutron. The project builds on experience gained with the previous apparatus operated at PSI until 2017, and is expected to deliver an order of magnitude better sensitivity with provision for further substantial improvements. An overview is given of the experimental method and setup, the sensitivity requirements for the apparatus are derived, and its technical design is described.
Alignments of eukaryotic CDKL proteins
Creators: name: Galindo, Máximo Ibo
Publisher: name: Zenodo
Year: 2024
Subjects: CDKL5 deficiency disorder
Epilepsy
Phylogeny

description: The human CDKL (CDK-like) protein family has five members (CDKL1, CDKL2, CDKL3, CDKL4, and CDKL5), and belongs to the group kinases named CMGCs, they are serine-threonine kinases which structural studies indicate that they contain a conserved N-terminal kinase domain with variable C-termini. As a first step, all the CDKL proteins were aligned. To construct a phylogeny of the CDKL family, the alignment was trimmed to the kinase domain, and realigned. Among the CDKLS, CDKL5 has the longest C-terminal end, which seems to be important for protein stability and localisation, although it may have further roles. In order to investigate conservation of this region, we aligned the C-terminal portions of all CDKL5 proteins, starting from the first amino acid after the kinase domain.
Dynamics of perturbations in Gurzadyan-Xue cosmological models
Creators: name: Vereshchagin, G. V.
name: Yegorian, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Perturbation theory within Newtonian approximation is presented for cosmological models with varying physical constants. Analytical solutions for perturbations dynamics are obtained for each Gurzadyan-Xue model with pressureless matter and radiation. We found that perturbations grow during entire expansion within GX models, including curvature- and vacuum-dominated stage when they cease to grow in the standard cosmological model.
Inhalt
Creators: name: Oschema, Klaus
name: Schneidmüller, Bernd
Publisher: name: Vorträge und Forschungen
Year: 2021

description: Vorträge und Forschungen, Bd. 90 (2021): Vorträge und Forschungen: Zukunft im Mittelalter. Zeitkonzepte und Planungsstrategien
Titelei
Creators: name: Oschema, Klaus
name: Schneidmüller, Bernd
Publisher: name: Vorträge und Forschungen
Year: 2021

description: Vorträge und Forschungen, Bd. 90 (2021): Vorträge und Forschungen: Zukunft im Mittelalter. Zeitkonzepte und Planungsstrategien
2017. L. Nixon and J. Moody, ‘Cultural Landscapes and Resources in Sphakia, SW Crete: A Diachronic Perspective’, in David Rupp and Jonathan Tomlinson (eds), From Maple to Olive. Proceedings of a Colloquium to Celebrate the 40th Anniversary of the Canadian Institute in Greece, Athens 10-11 June 2016, Athens: Publication of the Canadian Institute in Greece 10, 485-504
Creators: name: Sphakia Survey
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant
classificationCode: 430305
subject: Classical Greek and Roman history
classificationCode: 430307
subject: Environmental history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)

description: 2017. L. Nixon and J. Moody, ‘Cultural Landscapes and Resources in Sphakia, SW Crete: A Diachronic Perspective’, in David Rupp and Jonathan Tomlinson (eds), From Maple to Olive. Proceedings of a Colloquium to Celebrate the 40th Anniversary of the Canadian Institute in Greece, Athens 10-11 June 2016, Athens: Publication of the Canadian Institute in Greece 10, 485-504
Anisotropic magnetized white dwarfs: Unifying under- and over-luminous peculiar and standard type Ia supernovae
Creators: name: Deb, Debabrata
name: Mukhopadhyay, Banibrata
name: Weber, Fridolin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Ever since the observation of peculiar over-luminous type Ia supernovae (SNeIa), exploring possible violations of the canonical Chandrasekhar mass-limit (CML) has become a pressing research area of modern astrophysics. Since its first detection in 2003, more than a dozen of peculiar over-luminous SNeIa has been detected, but the true nature of the underlying progenitors is still under dispute. Furthermore, there are also under-luminous SNeIa whose progenitor masses appear to be well below the CML (sub-Chandrasekhar progenitors). These observations call into question how sacrosanct the CML is. We have shown recently in Paper I that the presence of a strong magnetic field, the anisotropy of dense matter, as well as the orientation of the magnetic field itself significantly influence the properties of neutron and quark stars. Here, we study these effects for white dwarfs, which shows that their properties are also severely impacted. Most importantly, we arrive at a variety of mass-radius relations of white dwarfs which accommodate sub- to super-Chandrasekhar mass limits. This urges caution when using white dwarfs associated with SNeIa as standard candles.
description: 11 pages including 11 figures and 3 tables; accepted for publication in The Astrophysical Journal (ApJ)