cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Generic Absorbing Transition in Coevolution Dynamics
Creators: name: Vazquez, F.
name: Eguiluz, V. M.
name: Miguel, M. San
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a coevolution voter model on a network that evolves according to the state of the nodes. In a single update, a link between opposite-state nodes is rewired with probability $p$, while with probability $1-p$ one of the nodes takes its neighbor's state. A mean-field approximation reveals an absorbing transition from an active to a frozen phase at a critical value $p_c=\frac{μ-2}{μ-1}$ that only depends on the average degree $μ$ of the network. The approach to the final state is characterized by a time scale that diverges at the critical point as $τ\sim |p_c-p|^{-1}$. We find that the active and frozen phases correspond to a connected and a fragmented network respectively. We show that the transition in finite-size systems can be seen as the sudden change in the trajectory of an equivalent random walk at the critical rewiring rate $p_c$, highlighting the fact that the mechanism behind the transition is a competition between the rates at which the network and the state of the nodes evolve.
description: 5 pages, 4 figures
Sunyaev-Zeldovich and Cosmic Microwave Background
Creators: name: Burigana, Carlo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Since its original formulation the Sunyaev-Zeldovich (SZ) effect has been recognized as a ``powerful laboratory'' for our comprehension of physical processes in cosmic structures and to derive crucial information on some general properties of the universe. After a discussion of the fundamental concepts and of some well established applications of the SZ effect towards galaxy clusters, I will focus on dedicated themes related to the SZ effect and other features in the cosmic microwave background (CMB) of particular interest in the view of the extremely high angular resolution observations achievable in the future with the Square Kilometre Array (SKA). SKA will allow the mapping of the thermal and density structure of clusters of galaxies at radio and centimetre bands with unprecedented resolution and sensitivity and with an extremely accurate control of extragalactic radio source contamination. The signatures from SZ effects and free-free emission at galactic scales and in the intergalactic medium probe the structure evolution at various cosmic times. The detection of these sources and their imaging at the high resolution and sensitivity achievable with SKA will greatly contribute to the comprehension of crucial cosmological and astrophysical aspects, as the physical conditions of early ionized halos, quasars and proto-galactic gas. The spectacular improvement in our understanding of the properties of extragalactic radio sources at very faint fluxes achievable with SKA will allow to accurately model their contribution to the diffuse radio background, greatly contributing to the interpretation of next generation of CMB spectrum experiments devoted to probe the thermal plasma history at early times.
description: 21 pages. Invited Lecture at the First MCCT-SKADS Training School, September 23-29, 2007, Medicina, Bologna, Italy. PoS(MCCT-SKADS)013
Boundary conditions: The path integral approach
Creators: name: Asorey, M.
name: Clemente-Gallardo, J.
name: Munoz-Castaneda, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The path integral approach to quantum mechanics requires a substantial generalisation to describe the dynamics of systems confined to bounded domains. Non-local boundary conditions can be introduced in Feynman's approach by means of boundary amplitude distributions and complex phases to describe the quantum dynamics in terms of the classical trajectories. The different prescriptions involve only trajectories reaching the boundary and correspond to different choices of boundary conditions of selfadjoint extensions of the Hamiltonian. One dimensional particle dynamics is analysed in detail.
description: 8 pages
Non-trivial surface states of samarium hexaboride at the (111) surface
Creators: name: Ohtsubo, Y.
name: Yamashita, Y.
name: Hagiwara, K.
name: Ideta, S.
name: Tanaka, K.
name: Yukawa, R.
name: Horiba, K.
name: Kumigashira, H.
name: Miyamoto, K.
name: Okuda, T.
name: Hirano, W.
name: Iga, F.
name: Kimura, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB$_6$), has stimulated considerable attention among those studying non-trivial electronic phenomena. However, experimental studies of these states have led to controversial conclusions mainly to the difficulty and inhomogeneity of the SmB$_6$ crystal surface. Here, we show the detailed electronic structure of SmB$_6$ with angle-resolved photoelectron spectroscopy measurements of the three-fold (111) surface where only two inequivalent time-reversal-invariant momenta (TRIM) exist. We observe the metallic two-dimensional state was dispersed across the bulk Kondo gap. Its helical in-plane spin polarisation around the surface TRIM suggests that SmB$_6$ is topologically non-trivial, according to the topological classification theory for weakly correlated systems. Based on these results, we propose a simple picture of the controversial topological classification of SmB$_6$.
description: 34 pages, 4 figures for main text; 9 figures for supplementary material
Near-horizon microstates of the D1-D5-P black hole
Creators: name: Raeymaekers, Joris
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct probe solutions in the attractor background of the five-dimensional D1-D5-P black hole which represent near-horizon microstates in the limit of large D1-charge. These generalize the corresponding solutions considered by Gaiotto, Strominger and Yin for the 4-dimensional D0-D4 black hole. Using U-duality and a 4D-5D connection, we argue that the relevant configurations are bound states of D1-branes that have expanded through the Myers effect to form a Kaluza-Klein monopole wrapping the black hole horizon. We show that these branes experience a magnetic field on their moduli space, and that the degeneracy of lowest Landau levels reproduces the Bekenstein-Hawking entropy.
description: Latex, 22 pages. v2: typos corrected, references added, published version
Engineering Scalable Human Liver and Placenta Platforms for Drug Screening and Cell Therapy
Creators: name: Panday, Regeant
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Physiologically relevant human in vitro models are useful for drug biotransformation and toxicity screening, disease modeling, and regenerative medicine. Specifically, the liver and placenta are two critical organs with significant implications for human health. As the largest internal organ, the liver performs vital metabolic functions to maintain blood homeostasis and is highly susceptible to various metabolic diseases, including drug-induced liver injury (DILI). Primary human hepatocytes (PHHs) and induced pluripotent stem cell (iPSC)-derived hepatocytes (iHeps) are two key cell sources used to build human-relevant liver models; however, there are fundamental limitations, including the rapid decline of PHH function in conventional cultures and functional immaturity of iHeps. Advanced engineered platforms that enable the precise modulation of microenvironmental factors, such as a controlled 3D microenvironment, homotypic and heterotypic cell-cell interactions, and in vivo-like oxygen tensions, can address these limitations of PHHs and iHeps. Droplet microfluidics facilitates the high-throughput generation of 3D microtissues using natural extracellular matrix (ECM) proteins and enables cell-cell interaction with relevant non-parenchymal cell (NPC) types. Additionally, gas-permeable culture plates enable precise manipulation of pericellular oxygen tension, which ranges from ~10% to ~3% in the hepatic lobule and is known to modulate compartmentalized hepatic phenotype, called ‘zonation.’ Lastly, 3D bioprinting is useful for generating larger tissue constructs for regenerative medicine. Similarly, the placenta facilitates fetal development through biosynthesis, metabolism, and transport and is highly vulnerable to toxic chemical exposure, especially during placental implantation. This thesis synergistically explores the role of the 3D microenvironment, cell-cell interactions, and physiological oxygen tensions in engineered liver and placenta models by employing the tools above. Finally, these engineered models are utilized in applications, including protecting cells from shear stress during 3D bioprinting and developing a scalable chemical screening platform. Ultimately, these physiologically relevant liver and placenta models have utility in drug toxicity screening, disease modeling, and regenerative medicine, aiding in improved outcomes for liver- and pregnancy-related complications.
Understanding Learning and Memory: the Role of Theta Oscillations across the Brain
Creators: name: Zimmerman, Michael Paul
Publisher: name: Purdue University Graduate School
Year: 2025
Subjects: classificationCode: 520203
subject: Cognitive neuroscience
classificationCode: 520202
subject: Behavioural neuroscience

description: Learning and memory are complex cognitive processes that help the brain understand and respond to the world around us. They are dynamic and constantly adapting as new sensory information is perceived and interpreted to make an appropriate response. However, the precise mechanisms underlying these processes, and how they are disrupted in learning disabilities, remain unknown. Recently, theta oscillations have been identified as a potential hallmark of visual familiarity encoding, as they emerge following passive exposure to a stimulus and are impaired in Fragile X syndrome (FX), a genetic form of autism spectrum disorder. Using acute in-vivo electrophysiological recordings with the Neuropixels probe, active learning paradigms, and multiple mouse strains, this dissertation further investigates the relationship between theta oscillations and these processes. First, we found that theta oscillations in the primary visual cortex and hippocampus emerge independently following passive familiarity, with temporal delays observed in a downstream region, the retrosplenial cortex. Second, FX mice exhibited impaired learning in a Go/No-Go visual discrimination task, which correlated with diminished theta oscillations. Third, increased theta power in wild-type mice was significantly associated with correct behavioral responses. Finally, we demonstrated that controlled neural plasticity is essential for theta oscillations to emerge following familiarity, as they are absent in histone deacetylase 4, 5 double knockout mice which lack this control. Overall, this work further links theta oscillations to the processes of learning and memory, providing new insights into the underlying mechanisms of these complex cognitive functions.
A Value-Based Approach to Predicting System Properties from Design
Creators: name: Scaffidi, Chris
name: Arora, Ashish
name: Butler, Shawn
name: Shaw, Mary
Publisher: name: Carnegie Mellon University
Year: 2005
Subjects: subject: 80399 Computer Software not elsewhere classified
subject: FOS: Computer and information sciences

description: Traditional engineering requires evaluating designs before implementing them. Evaluating a design predicts the properties of a reasonable implementation and the value of these properties to a stakeholder. Software engineering has some (though not enough) relevant evaluation techniques but lacks frameworks to compare, develop, and apply those techniques in a manner that respects h value varies by stakeholder. We present an adaptation of economists' value models that, given a design and a development method, predicts value to a client. We give examples supporting our approach. Even in its preliminary state, our approach helps to explain and characterize design evaluation techniques and shows sufficient promise to justify further development.
Interplay between Yukawa and Tomonaga in the Birth of Mesons
Creators: name: Yamazaki, Toshimitsu
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Light is shed on the early stage in the birth of Yukawa's meson theory, particularly on the interplay between Yukawa and Tomonaga in 1933. The discovery of the muon by Nishina' group in 1937 is also reviewed. It is pointed out that Heisenberg's attempt to explain the nuclear force in terms of the Heitler-London scheme, overcome by Yukawa and abandoned since then, is now being revived as a mechanism for a super strong nuclear force caused by a migrating real Kbar meson.
description: Invited tals at the Yukawa Centennial Session at INPC07, June, 2007, Tokyo. to be published in NPA. Nucl. Phys. A, in press
Cauchy noise loss for stochastic optimization of random matrix models via free deterministic equivalents
Creators: name: Hayase, Tomohiro
Publisher: name: arXiv
Year: 2018
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Operator Algebras (math.OA)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: For random matrix models, the parameter estimation based on the traditional likelihood functions is not straightforward in particular when we have only one sample matrix. We introduce a new parameter optimization method for random matrix models which works even in such a case. The method is based on the spectral distribution instead of the traditional likelihood. In the method, the Cauchy noise has an essential role because the free deterministic equivalent, which is a tool in free probability theory, allows us to approximate the spectral distribution perturbed by Cauchy noises by a smooth and accessible density function. Moreover, we study an asymptotic property of determination gap, which has a similar role as generalization gap. Besides, we propose a new dimensionality recovery method for the signal-plus-noise model, and experimentally demonstrate that it recovers the rank of the signal part even if the true rank is not small. It is a simultaneous rank selection and parameter estimation procedure.
description: 29 pages, 13 figures, v3: minor correction. Submitted. Our simulation code is available at https://github.com/ThayaFluss/cnl. Submitted to a journal
A Method for Finding Similar Documents Relying on Adding Repetition of Symbols in Length Based Filtering
Creators: name: Azgomi, Hossein
name: Mahsayeh, Masumeh Ghasemi
name: Mohammadi, Masoud
name: Moradi, Milad
Publisher: name: arXiv
Year: 2017
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: A basic topic in mining of massive dataset is finding similar items. As an example, finding similar documents can be recommended. In this case many methods are existed. For example, Shingling method and length based filtering are one of them. In Shingling method, from each document, substrings have been selected with symbol name and, they are placed on one set. For finding similar documents, the similarities of sets that related with them have been calculated. In Length based filtering just documents which close these lengths have been compared. These methods don't consider repetition of symbols. With considering the repetition can calculate length of documents with more accurately. In this paper we suggested a method for finding similar documents with considering the repetition of symbols. This method separated documents to better form. The main goal of this paper is presentation a method for finding similar documents with take fewer comparisons and time indeed.
The Dark Energy Survey Image Processing Pipeline
Creators: name: Morganson, E.
name: Gruendl, R. A.
name: Menanteau, F.
name: Kind, M. Carrasco
name: Chen, Y. -C.
name: Daues, G.
name: Drlica-Wagner, A.
name: Friedel, D. N.
name: Gower, M.
name: Johnson, M. W. G.
name: Johnson, M. D.
name: Kessler, R.
name: Paz-Chinchón, F.
name: Petravick, D.
name: Pond, C.
name: Yanny, B.
name: Allam, S.
name: Armstrong, R.
name: Barkhouse, W.
name: Bechtol, K.
name: Benoit-Lévy, A.
name: Bernstein, G. M.
name: Bertin, E.
name: Buckley-Geer, E.
name: Covarrubias, R.
name: Desai, S.
name: Diehl, H. T.
name: Goldstein, D. A.
name: Gruen, D.
name: Li, T. S.
name: Lin, H.
name: Marriner, J.
name: Mohr, J. J.
name: Neilsen, E.
name: Ngeow, C. -C.
name: Paech, K.
name: Rykoff, E. S.
name: Sako, M.
name: Sevilla-Noarbe, I.
name: Sheldon, E.
name: Sobreira, F.
name: Tucker, D. L.
name: Wester, W.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Dark Energy Survey (DES) is a five-year optical imaging campaign with the goal of understanding the origin of cosmic acceleration. DES performs a 5000 square degree survey of the southern sky in five optical bands (g,r,i,z,Y) to a depth of ~24th magnitude. Contemporaneously, DES performs a deep, time-domain survey in four optical bands (g,r,i,z) over 27 square degrees. DES exposures are processed nightly with an evolving data reduction pipeline and evaluated for image quality to determine if they need to be retaken. Difference imaging and transient source detection are also performed in the time domain component nightly. On a bi-annual basis, DES exposures are reprocessed with a refined pipeline and coadded to maximize imaging depth. Here we describe the DES image processing pipeline in support of DES science, as a reference for users of archival DES data, and as a guide for future astronomical surveys.
IterGANs: Iterative GANs to Learn and Control 3D Object Transformation
Creators: name: Galama, Ysbrand
name: Mensink, Thomas
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We are interested in learning visual representations which allow for 3D manipulations of visual objects based on a single 2D image. We cast this into an image-to-image transformation task, and propose Iterative Generative Adversarial Networks (IterGANs) which iteratively transform an input image into an output image. Our models learn a visual representation that can be used for objects seen in training, but also for never seen objects. Since object manipulation requires a full understanding of the geometry and appearance of the object, our IterGANs learn an implicit 3D model and a full appearance model of the object, which are both inferred from a single (test) image. Two advantages of IterGANs are that the intermediate generated images can be used for an additional supervision signal, even in an unsupervised fashion, and that the number of iterations can be used as a control signal to steer the transformation. Experiments on rotated objects and scenes show how IterGANs help with the generation process.
title: ADCO, Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Cart. 176 (11 H 8), f. 0075
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2017
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: cartulaire

description: Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 176 (11 H 8), f. 0075, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 176 (11 H 8), f. 0075, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
A User Study of Policy Creation in a Flexible Access-Control System
Creators: name: Lujo  Bauer
name: Cranor, Lorrie Faith
name: Reeder, Robert W
name: Reiter, Michael K
name: Vaniea, Kami
Publisher: name: Carnegie Mellon University
Year: 2008
Subjects: subject: 80399 Computer Software not elsewhere classified
subject: FOS: Computer and information sciences

description: Significant effort has been invested in developing expressive and flexible access-control languages and systems. However, little has been done to evaluate these systems in practical situations with real users, and few attempts have been made to discover and analyze the access-control policies that users actually want to implement. We report on a user study in which we derive the ideal access policies desired by a group of users for physical security in an office environment. We compare these ideal policies to the policies the users actually implemented with keys and with a smartphone-based distributed access-control system. We develop a methodology that allows us to show quantitatively that the smartphone system allowed our users to implement their ideal policies more accurately and securely than they could with keys, and we describe where each system fell short.
An optimal boundedness on weak $\bQ$-Fano threefolds
Creators: name: Chen, Jungkai Alfred
name: Chen, Meng
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J30; 14J45

description: Let $X$ be a terminal weak $\bQ$-Fano threefold. We prove that $P_{-6}(X)>0$ and $P_{-8}(X)>1$. We also prove that the anti-canonical volume has a universal lower bound $-K_X^3 \geq 1/330$. This lower bound is optimal.
Casimir energy and entropy between dissipative mirrors
Creators: name: Intravaia, F.
name: Henkel, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss the Casimir effect between two identical, parallel slabs, emphasizing the role of dissipation and temperature. Starting from quite general assumptions, we analyze the behavior of the Casimir entropy in the limit T->0 and link it to the behavior of the slab's reflection coefficients at low frequencies. We also derive a formula in terms of a sum over modes, valid for dissipative slabs that can be interpreted in terms of a damped quantum oscillator.
description: 8 pages, 1 figure
Negative Binomial Models for Longitudinal and Sparse Data
Creators: name: Yu, Zhou
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Longitudinal count data such as traffic flows data and email data are sometimes over-dispersed and sparse with an exceeded number of zeros, which are often challenging to be modeled. In this dissertation, I make solid contributions to the statistical modeling of longitudinal and sparse longitudinal responses with applications to traffic flows data and email data.
title: Transcription du manuscrit de Semur-en-Auxois, Bibliothèque Municipale, ms. 1, p. 55
Creators: name: Aubert, Eduardo Henrik
name: Brochard, Pierre
name: Aubert, Eduardo Henrik
name: Brochard, Pierre
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2022
Subjects: subject: Laboratoire de médiévistique occidentale de Paris
subject: Semur-en-Auxois
subject: LaMOP

description: Transcription du manuscrit de Semur-en-Auxois, Bibliothèque Municipale, ms. 1, p. 55

production-software: eScriptorium + Kraken version 3.0.13 (PageXml)
description: Source: https://www.nakala.fr/10.34847/nkl.daferk4a
description: Source: https://www.nakala.fr/10.34847/nkl.e905tdea
description: Relation: https://lamop.hypotheses.org/
description: Transcription du manuscrit Semur-en-Auxois, Bibliothèque Municipale, ms. 1
description: Transcription du manuscrit Semur-en-Auxois, Bibliothèque Municipale, ms. 1
A Trainable Transfer-based Machine Translation Approach for Languages with Limited Resources
Creators: name: Lavie, Alon
name: Probst, Katharina
name: Peterson, Erik
name: Vogel, Stephan
name: Levin, Lori
name: Llitjós, Ariadna Font
name: Carbonell, Jaime G.
Publisher: name: Carnegie Mellon University
Year: 2004
Subjects: subject: 80399 Computer Software not elsewhere classified
subject: FOS: Computer and information sciences

description: We describe a Machine Translation (MT) approach that is specifically designed to enable rapid development of MT for languages with limited amounts of online resources. Our approach assumes the availability of a small number of bi-lingual speakers of the two languages, but these need not be linguistic experts. The bi-lingual speakers create a comparatively small corpus of word aligned phrases and sentences (on the order of magnitude of a few thousand sentence pairs) using a specially designed elicitation tool. From this data, the learning module of our system automatically infers hierarchical syntactic transfer rules, which encode how syntactic constituent structures in the source language transfer to the target language. The collection of transfer rules is then used in our run-time system to translate previously unseen source language text into the target language. We describe the general principles underlying our approach, and present results from an experiment, where we developed a basic Hindi-to-English MT system over the course of two months, using extremely limited resources.
Convolution type stochastic Volterra equations
Creators: name: Karczewska, Anna
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H20; 60H05; 45D05

description: The aim of this work is to present, in self-contained form, results concerning fundamental and the most important questions related to linear stochastic Volterra equations of convolution type. The paper is devoted to study the existence and some kind of regularity of solutions to stochastic Volterra equations in Hilbert space and the space of tempered distributions, as well. In recent years the theory of Volterra equations, particularly fractional ones, has undergone a big development. This is an emerging area of research with interesting mathematical questions and various important applications. The increasing interest in these equations comes from their applications to problems from physics and engeenering, particularly from viscoelasticity, heat conduction in materials with memory or electrodynamics with memory.
description: Monograph, 101 pages
Impact of interactions on human dynamics
Creators: name: Oliveira, J. G.
name: Vazquez, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Queueing theory has been recently proposed as a framework to model the heavy tailed statistics of human activity patterns. The main predictions are the existence of a power-law distribution for the interevent time of human actions and two decay exponents $α=1$ and $α=3/2$. Current models lack, however, a key aspect of human dynamics, i.e. several tasks require, or are determined by, interactions between individuals. Here we introduce a minimal queueing model of human dynamics that already takes into account human-human interactions. To achieve large scale simulations we obtain a coarse-grained version of the model, allowing us to reach large interevent times and reliable scaling exponents estimations. Using this we show that the interevent distribution of interacting tasks exhibit the scaling exponents $α=2$, 3/2 and a series of numerable values between 3/2 and 1. This work demonstrates that, within the context of queueing models of human dynamics, interactions change the exponent of the power-law distributed interevent times. Beyond the study of human dynamics, these results are relevant to systems where the event of interest consists of the simultaneous occurrence of two (or more) events.
description: 5 pages, 4 figures, changes in abstract and text. Accepted for publication in Physica A
HMC Hub Matter in the Helmholtz Metadata Collaboration
Creators: name: Kubin, Markus
Publisher: name: Zenodo
Year: 2024
Subjects: Helmholtz Metadata Collaboration
Helmholtz Association
FAIR Data
Metadata
Dashboard
Data policy
Training
Use cases
Glossary development

description: Hub Matter in the Helmholtz Metadata Collaboration (HMC) platform of the Helmholtz Association supports FAIR (meta)data practices in research field Matter, which consists of three subthemes: particle, astro particle and plasma physics, accelerator and detector system technology, and user programs of photon, neutron, and ion beam facilities. HMC Hub Matter activities focus on providing guidance, collecting quality metrics and benchmarking, developing use cases, and implementing and building capacity in the community.

In this poster contribution to the RDA-DE-24 conference, we share some of our approaches and strategies with the RDA-DE community:

Having recognized the need to connect policy and practicability, we have co-developed and improved data guidelines at several Helmholtz centers and beyond, contributing to better management of research data in the research field Matter.

To build community capacity in the use of harmonized semantics, Hub Matter co-moderates a cross-disciplinary, community-driven development process of a method-specific glossary. A web-based user interface allows users to explore the glossary.

Hub Matter provides technical support and community consultation in various use cases from particle physics to ion beam communities. Peer support groups have formed around this technical support and provide a vehicle for collaboration with other initiatives.

To continuously monitor, understand and communicate the culture of data publishing and FAIR data practices in the Helmholtz research communities, we have developed a dashboard approach, unveiling the datasets published by the Helmholtz research communities in a manifold of data repositories. As a first approach to understanding the status quo of FAIR data in our organization, we have adopted the F-UJI framework for assessing these data publications and complemented this approach with manual methods based on the FAIR Data Maturity Model. With this information, we aim to provide support and guidance to research data infrastructures and research communities.
The binary fraction of planetary nebula central stars: the promise of VPHAS+
Creators: name: Barker, Helen
name: Zijlstra, Albert
name: De Marco, Orsola
name: Frew, David J.
name: Drew, J. E.
name: Corradi, R. L. M.
name: Eislöffel, Jochen
name: Parker, Quentin A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The majority of planetary nebulae (PNe) are not spherical, and current single-star models cannot adequately explain all the morphologies we observe. This has led to the Binary Hypothesis, which states that PNe are preferentially formed by binary systems. This hypothesis can be corroborated or disproved by comparing the estimated binary fraction of all PNe central stars (CS) to that of the supposed progenitor population. One way to quantify the rate of CS binarity is to detect near infra-red (IR) excess indicative of a low-mass main sequence companion. In this paper, a sample of known PNe within data release 2 of the ongoing VPHAS+ are investigated. We give details of the method used to calibrate VPHAS+ photometry, and present the expected colours of CS and main sequence stars within the survey. Objects were scrutinized to remove PN mimics from our sample and identify true CS. Within our final sample of 7 CS, 6 had previously either not been identified or confirmed. We detected an $i$ band excess indicative of a low-mass companion star in 3 CS, including one known binary, leading us to to conclude that VPHAS+ provides the precise photometry required for the IR excess method presented here, and will likely improve as the survey completes and the calibration process finalised. Given the promising results from this trial sample, the entire VPHAS+ catalogue should be used to study PNe and extend the IR excess-tested CS sample.
description: 21 pages, 9 figures, accepted for publication in MNRAS
On the isomorphism problem for $C^*$-algebras of nilpotent Lie groups
Creators: name: Beltita, Ingrid
name: Beltita, Daniel
Publisher: name: arXiv
Year: 2018
Subjects: subject: Operator Algebras (math.OA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: Primary 22D25. Secondary 22E27, 22E25, 17B30

description: We investigate to what extent a nilpotent Lie group is determined by its $C^*$-algebra. We prove that, within the class of exponential Lie groups, direct products of Heisenberg groups with abelian Lie groups are uniquely determined even by their unitary dual, while nilpotent Lie groups of dimension $\le 5$ are uniquely determined by the Morita equivalence class of their $C^*$-algebras. We also find that this last property is shared by the filiform Lie groups and the $6$-dimensional free two-step nilpotent Lie group.
description: 26 pages, to appear in the Journal of Topology and Analysis
Truth vs Reality: From Sexsomnia to Schizophrenia and from Schizophrenia to Awakening
Creators: name: Fuertes Oliva, Martín
Publisher: name: Zenodo
Year: 2024

description: This case study explores the intersection between altered states of consciousness and mentalhealth deterioration, focusing on a young father who unknowingly fathers a child due to asexsomnia episode. His partner conceals the child’s existence, triggering a series of psychoticsymptoms resembling schizophrenia in the father. Inspired by the myth of Athena's birth fromZeus—where Zeus is unaware of Metis's pregnancy—the study analyzes how hidden truthsaffect the individual's perception of reality and lead to psychological disintegration. The father’seventual uncovering of the truth allows him to reconnect with reality, resolving his psychosis anddemonstrating the therapeutic potential of uncovering concealed truths in mental health.
Adequacy of Si:P Chains as Fermi-Hubbard Simulators
Creators: name: Dusko, Amintor
name: Delgado, Alain
name: Saraiva, André
name: Koiller, Belita
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The challenge of simulating many-body models with analogue physical systems requires both experimental precision and very low operational temperatures. Atomically precise placement of dopants in Si permits the construction of nanowires by design. We investigate the suitability of these interacting electron systems as simulators of a fermionic extended Hubbard model on demand. We describe the single particle wavefunctions as a Linear Combination of Dopant Orbitals (LCDO). The electronic states are calculated within configuration interaction (CI). Due to the peculiar oscillatory behavior of each basis orbital, properties of these chains are strongly affected by the interdonor distance $R_0$, in a non-monotonic way. Ground state (T=0K) properties such as charge and spin correlations are shown to remain robust under temperatures up to 4K for specific values of $R_0$. The robustness of the model against disorder is also tested, allowing some fluctuation of the placement site around the target position. We suggest that finite donor chains in Si may serve as an analog simulator for strongly correlated model Hamiltonians. This simulator is, in many ways, complementary to those based on cold atoms in optical lattices---the trade-off between the tunability achievable in the latter and the survival of correlation at higher operation temperatures for the former suggests that both technologies are applicable for different regimes.
A Theory of Tagged Objects
Creators: name: Lee, Joseph
name: Aldrich, Jonathan
name: Shaw, Troy
name: Potanin, Alex
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: 80399 Computer Software not elsewhere classified
subject: FOS: Computer and information sciences

description: Foundational models of object-oriented constructs typically model objects as records with a structural type. However, many object-oriented languages are class-based; statically-typed formal models of these languages tend to sacrifice the foundational nature of the record-based models, and in addition cannot express dynamic class loading or creation. In this paper, we explore how to model statically-typed object-oriented languages that support dynamic class creation using foundational constructs of type theory. We start with an extensible tag construct motivated by type theory, and adapt it to support static reasoning about class hierarchy and the tags supported by each object. The result is a model that better explains the relationship between objectoriented and functional programming paradigms, suggests a useful enhancement to functional programming languages, and paves the way for more expressive statically typed object-oriented languages. In that vein, we describe the design and implementation of the Wyvern language, which leverages our theory
Explosion in weighted Hyperbolic Random Graphs and Geometric Inhomogeneous Random Graphs
Creators: name: Komjáthy, Júlia
name: Lodewijks, Bas
Publisher: name: arXiv
Year: 2018
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In this paper we study weighted distances in scale-free spatial network models: hyperbolic random graphs (HRG), geometric inhomogeneous random graphs (GIRG) and scale-free percolation (SFP). In HRGs, $n=Θ(\mathrm{e}^{R/2})$ vertices are sampled independently from the hyperbolic disk with radius $R$ and two vertices are connected either when they are within hyperbolic distance $R$, or independently with a probability depending on the hyperbolic distance. In GIRGs and SFP, each vertex is given an independent weight and location from an underlying measured metric space and $\mathbb{Z}^d$, respectively, and two vertices are connected independently with a probability that is a function of their distance and weights. We assign i.i.d. weights to the edges of the random graphs and study the weighted distance between two uniformly chosen vertices. In SFP, we study the weighted distance from the origin of vertex-sequences with norm tending to infinity. In particular, we study the case when the parameters are so that the degree distribution in the graph follows a power law with exponent $τ\in(2,3)$ (infinite variance), and the edge-weight distribution is such that it produces an explosive age-dependent branching process with power-law offspring distribution. We show that in all three models, typical distances within the giant/infinite component converge in distribution, solving an open question in [Explosion and distances in scale-free percolation (2017)]. The main tools of our proof are to couple the models to infinite versions, to follow the shortest paths to infinity and to connect these paths using weight-dependent percolation on the graphs: delete edges attached to vertices with higher weight with higher probability. We realise this using the edge-weights: only short edges connected to high weight vertices will stay, yielding arbitrarily short upper bounds for the connections.
description: 49 pages, 4 figures
A Theory of Expressiveness in Mechanisms
Creators: name: Benisch, Michael
name: Sadeh, Norman
name: Sandholm, Tuomas
Publisher: name: Carnegie Mellon University
Year: 2007
Subjects: subject: 80399 Computer Software not elsewhere classified
subject: FOS: Computer and information sciences

description: A key trend in the world—especially in electronic commerce—is a demand for higher levels of expressiveness in the mechanisms that mediate interactions, such as the allocation of resources, matching of peers, and elicitation of opinions from large and diverse communities. Intuitively, one would think that this increase in expressiveness would lead to more efficient mechanisms (e.g., due to better matching of supply and demand). However, until now we have lacked a general way of characterizing the expressiveness of these mechanisms, analyzing how it impacts the actions taken by rational agents—and ultimately the outcome of the mechanism. In this technical report we introduce a general model of expressiveness for mechanisms. Our model is based on a new measure which we refer to as the maximum impact dimension. The measure captures the number of different ways that an agent can impact the outcome of a mechanism. We proceed to uncover a fundamental connection between this measure and the concept of shattering from computational learning theory. We also provide a way to determine an upper bound on the expected efficiency of any mechanism under its most efficient Nash equilibrium which, remarkably, depends only on the mechanism’s expressiveness. We show that for any setting and any prior over agent preferences, the bound on efficiency of a mechanism designed optimally under a constraint on expressiveness increases strictly as more expressiveness is allowed (until the bound reaches full efficiency). In addition, we prove that a small increase in expressiveness can potentially lead to an arbitrarily large increase in the efficiency bound, depending on the prior. We conclude with a study of a restricted class of mechanisms which we call channel based. The restriction is that these mechanisms take expressions of value through channels from agents to outcomes, and select the outcome with the largest sum. (Channel-based mechanisms subsume most combinatorial and multi-attribute auctions, any Vickrey-Clarke-Groves mechanism, etc.) In this class, a natural measure of expressiveness is the number of channels allowed (this generalizes the k-wise dependence measure of expressiveness traditionally used in the combinatorial auction literature). As a sanity check of our general domain-independent measure of expressiveness, we show that it appropriately relates to the number of channels when applied to channel-based mechanisms. This allows us to transfer all of our results regarding efficiency to this domain.
Drip Paintings and Fractal Analysis
Creators: name: Jones-Smith, Katherine
name: Mathur, Harsh
name: Krauss, Lawrence M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: It has been claimed [1-6] that fractal analysis can be applied to unambiguously characterize works of art such as the drip paintings of Jackson Pollock. This academic issue has become of more general interest following the recent discovery of a cache of disputed Pollock paintings. We definitively demonstrate here, by analyzing paintings by Pollock and others, that fractal criteria provide no information about artistic authenticity. This work has also led to two new results in fractal analysis of more general scientific significance. First, the composite of two fractals is not generally scale invariant and exhibits complex multifractal scaling in the small distance asymptotic limit. Second the statistics of box-counting and related staircases provide a new way to characterize geometry and distinguish fractals from Euclidean objects.
Efficiency of free auxiliary models in describing interacting fermions: from the Kohn-Sham model to the optimal entanglement model
Creators: name: Patrick, Kristian
name: Herrera, Marcela
name: Southall, Jake
name: D'Amico, Irene
name: Pachos, Jiannis K.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Density functional theory maps an interacting Hamiltonian onto the Kohn-Sham Hamiltonian, an explicitly free model with identical local fermion densities. Using the interaction distance, the minimum distance between the ground state of the interacting system and a generic free fermion state, we quantify the applicability and limitations of the exact Kohn-Sham model in capturing the various properties of the interacting system. As a byproduct, this distance determines the optimal free state that reproduces the entanglement properties of the interacting system as faithfully as possible. The parent Hamiltonian of the optimal free state identifies a system that can determine the expectation value of any observable with controlled accuracy. This optimal entanglement model opens up the possibility of extending the systematic applicability of auxiliary free models into the non-perturbative, strongly-correlated regimes.
description: 7+2 pages, 3+1 figures, presentation improved
Exploring the hadron resonance gas phase on the QCD phase diagram
Creators: name: Samanta, Subhasis
name: Chatterjee, Sandeep
name: Mohanty, Bedangadas
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Lattice computations of strongly interacting matter at finite temperature $T$ and baryon chemical potential $μ_B$ suggest that the QCD thermodynamics deep in the hadronic phase can be adequately modeled by an ideal hadron resonance gas (I-HRG). However, it is not clear where on the $(μ_B, T)$ plane this description breaks down, making it essential to account for hadronic interactions and change in the nature of the degrees of freedom. We have studied several thermodynamic functions within the I-HRG model and try to identify the region of the QCD phase diagram where it becomes essential to include non-ideal effects into the I-HRG model. We work with only those thermodynamic quantities that show a monotonic rise with $T$ and $μ_B$ in I-HRG. Their high temperature limiting values where QCD becomes simply a Stefan-Boltzmann (SB) gas of massless quarks and gluons is known. The rise of these quantities in I-HRG beyond the corresponding SB limit values indicate the need to include interactions into I-HRG to study QCD thermodynamics. This works as a guiding principle on the QCD phase diagram where interacting HRG can take over from I-HRG. For $μ_B/T\leq2$, $χ^Q_2$ shoots the SB limit at the smallest $T$, while for higher values of $μ_B/T$,$C_{BS}=-3χ^{BS}_{11}/χ^S_2$ takes over. We further comment on the relative positions between the freezeout curve obtained by thermal fits to the measured hadron yields and the obtained line where I-HRG overshoots SB limit.
Bochner transforms, perturbations and amoebae of holomorphic almost periodic mappings in tube domains
Creators: name: Fabiano, Adelina
name: Guenot, Jacques
name: Silipo, James
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32A60, 42A75

description: We give an alternative representation of the closure of the Bochner transform of a holomorphic almost periodic mapping in a tube domain. For such mappings we introduce a new notion of amoeba and we show that, for mappings which are regular in the sense of Ronkin, this new notion agrees with Favorov's one. We prove that the amoeba complement of a regular holomorphic almost periodic mapping, defined on Cn and taking its values in Cm+1, is a Henriques m-convex subset of Rn. Finally, we compare some different notions of regularity.