cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Anatomical variations of the inferior vena cava: preoperative approach
Creators: name: Alfonso Cerdan, Sheila
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Congenital
subject: Blood
subject: Normal variants
subject: Education
subject: Diagnostic procedure
subject: CT-Angiography
subject: CT
subject: Veins / Vena cava
subject: Anatomy
subject: Abdomen

description: Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References
description: Learning objectives: - Review the anatomical variations of the inferior vena cava (IVC) and its embryology. - Highlight relevant MDCT findings of the most important and frequent anatomical variations to be considered before surgical procedures. - Differentiate...
Evolution of Land Cover Definitions and Survey for the Economics and Statistics Service
Creators: name: May, George
name: May, George
Publisher: name: Unknown
Year: 1981
Subjects: Research Methods/ Statistical Methods
Teaching/Communication/Extension/Profession

description: Excerpts from the Introduction: The sampling strategy and techniques employed in the June Enumerative Survey (JES) provides a capability to obtain accurate crop acreage estimates. This approach is well established and is a main vehicle for obtaining state and national data for major crops. During the last two decades land management and land use planning have become important factors in the American society. The loss of prime agriculture land, increased urbanization, and deforestation are only a few of the concerns facing this Nation. The type and amount of land covers currently positioned on the landscape are critical elements of land use management. From this need for land cover information arose the question as to whether or not the JES could be expanded to provide acreage estimates for non-crop land cover types. USDA/ESS has no mandate to collect and report data on land cover types, except crops. Other federal and state agencies such as SCS, FS, and USGS have responsibilities to provide non-crop data. But, if ESS could provide land cover information to these users, then the basic “core costs” of materials and processing can be spread over a wider benefit base. As the Landsat crop area estimates move from the research mode into a production effort, the benefits anticipated for providing land cover data will help justify costs of Landsat regression estimates.
title: Clinico-radio-pathological correlation of infectious diseases
Creators: name: Qureshi, Mahrukh
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Respiratory system
subject: Abdomen
subject: Neuroradiology brain
subject: CT
subject: MR
subject: Digital radiography
subject: Imaging sequences
subject: Abscess delineation
subject: Infection

description: Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References
description: Learning objectives: To demonstrate image findings of intracranial tuberculosis (TB) and cryptococcosis seen within our institution. To present 4 unusual and interesting presentations of TB seen in the chest / abdomen. To highlight the importance of the rising...
How Environment Affects Galaxy Metallicity through Stripping and Formation History: Lessons from the Illustris Simulation
Creators: name: Genel, Shy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent studies have found higher galaxy metallicities in richer environments. It is not yet clear, however, whether metallicity-environment dependencies are merely an indirect consequence of environmentally dependent formation histories, or of environment related processes directly affecting metallicity. Here, we present a first detailed study of metallicity-environment correlations in a cosmological hydrodynamical simulation, in particular the Illustris simulation. Illustris galaxies display similar relations to those observed. Utilizing our knowledge of simulated formation histories, and leveraging the large simulation volume, we construct galaxy samples of satellites and centrals that are matched in formation histories. This allows us to find that ~1/3 of the metallicity-environment correlation is due to different formation histories in different environments. This is a combined effect of satellites (in particular, in denser environments) having on average lower z=0 star formation rates (SFRs), and of their older stellar ages, even at a given z=0 SFR. Most of the difference, ~2/3, however, is caused by the higher concentration of star-forming disks of satellite galaxies, as this biases their SFR-weighted metallicities toward their inner, more metal-rich parts. With a newly defined quantity, the 'radially averaged' metallicity, which captures the metallicity profile but is independent of the SFR profile, the metallicities of satellites and centrals become environmentally independent once they are matched in formation history. We find that circumgalactic metallicity (defined as rapidly inflowing gas around the virial radius), while sensitive to environment, has no measurable effect on the metallicity of the star-forming gas inside the galaxies.
description: Accepted to ApJ. 15 pages. Key figures are 6, 7, 11, and 13
Multi-agent systems for quadcopters
Creators: name: Carney, Richard
name: Chyba, Monique
name: Gray, Chris
name: Shanbrom, Corey
name: Wilkens, George
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Differential Geometry (math.DG)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 70E60, 93A14, 70E55

description: Unmanned Aerial Vehicles (UAVs) have been increasingly used in the context of remote sensing missions such as target search and tracking, mapping, or surveillance monitoring. In the first part of our paper we consider agent dynamics, network topologies, and collective behaviors. The objective is to enable multiple UAVs to collaborate toward a common goal, as one would find in a remote sensing setting. An agreement protocol is carried out by the multi-agents using local information, and without external user input. The second part of the paper focuses on the equations of motion for a specific type of UAV, the quadcopter, and expresses them as an affine nonlinear control system. Finally, we illustrate our work with a simulation of an agreement protocol for dynamically sound quadcopters augmenting the particle graph theoretic approach with orientation and a proper dynamics for quadcopters.
description: 28 pages, 12 figures
Bounded generation for congruence subgroups of ${\rm Sp}_4(R)$
Creators: name: Trost, Alexander Alois
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20Gxx

description: This paper describes a bounded generation result concerning the minimal natural number $K$ such that for $Q(C_2,2R):=\{A\varepsilon_ϕ(2x)A^{-1}|x\in R,A\in{\rm Sp}_4(R),ϕ\in C_2\}$, one has $N_{C_2,2R}=\{X_1\cdots X_K|\forall 1\leq i\leq K:X_i\in Q(C_2,2R)\}$ for rings of algebraic integers $R$ and the principal congruence subgroup $N_{C_2,2R}$ in ${\rm Sp}_4(R).$ This gives an explicit version of an abstract bounded generation result of a similar type as presented by Morris. Furthermore, the result presented does not depend on several number-theoretic quantities unlike Morris' result. Using this bounded generation result, we further give explicit bounds for the strong boundedness of ${\rm Sp}_4(R)$ for certain examples of rings $R,$ thereby giving explicit versions of results in an earlier paper. We further give a classification of normally generating subsets of ${\rm Sp}_4(R)$ for $R$ a ring of algebraic integers.
title: Pulmonary nodules, masses and infiltrates with specific semiology: when diagnosis is based on imaging
Creators: name: Rodriguez Rodriguez, Manuel Luis
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Thorax
subject: CT
subject: Conventional radiography
subject: Observer performance
subject: Infection
subject: Neoplasia
subject: Congenital

description: Purpose Methods and Materials Results Conclusion References Personal Information
description: Purpose: To describe the semiological findings of conventional radiography or computerised tomography (CT) that lead to a single diagnosis or reduced range of possible diagnoses of lung...
Kernels of Hilbert Module Maps: A Counterexample
Creators: name: Kaad, Jens
name: Skeide, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L08

description: Answering a long standing question, we give an example of a Hilbert module and a nonzero bounded right linear map having a kernel with trivial orthogonal complement. In particular, this kernel is different from its own double orthogonal complement.
description: 6 pages
Impact of sterile neutrino dark matter on core-collapse supernovae
Creators: name: Warren, MacKenzie L.
name: Mathews, Grant J.
name: Meixner, Matthew
name: Hidaka, Jun
name: Kajino, Toshitaka
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We summarize the impact of sterile neutrino dark matter on core-collapse supernova explosions. We explore various oscillations between electron neutrinos or mixed $μ-τ$ neutrinos and right-handed sterile neutrinos that may occur within a core-collapse supernova. In particular, we consider sterile neutrino masses and mixing angles that are consistent with sterile neutrino dark matter candidates as indicated by recent X-ray flux measurements. We find that the interpretation of the observed 3.5 keV X-ray excess as due to a decaying 7 keV sterile neutrino that comprises 100\% of the dark matter would have almost no observable effect on supernova explosions. However, in the more realistic case in which the decaying sterile neutrino comprises only a small fraction of the total dark matter density due to the presence of other sterile neutrino flavors, WIMPs, etc., a larger mixing angle is allowed. In this case a 7 keV sterile neutrino could have a significant impact on core-collapse supernovae. We also consider mixing between $μ-τ$ neutrinos and sterile neutrinos. We find, however, that this mixing does not significantly alter the explosion and has no observable effect on the neutrino luminosities at early times.
description: 18 pages, 6 figures, submitted to Modern Physics Letters A
title: Perianal fistulas – what the surgeon wants to know
Creators: name: Sousa, Marta
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Pelvis
subject: MR
subject: Diagnostic procedure
subject: Fistula

description: Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References
description: Learning objectives: To discuss perianal fistulas, their causes and consequences. To illustrate with relevant imaging findings, describing their classification according to Parks and the St. James University Hospital Classification (SJUHC), and the implications of each...
Factorization of Radiative Leptonic Decays of $B^-$ and $D^-$ Mesons Including the Soft Photon Region
Creators: name: Yang, Ji-Chong
name: Yang, Mao-Zhi
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we study the radiative leptonic decays of $B^-$ and $D^-$ mesons using factorization approach. Factorization is proved to be valid explicitly at 1-loop level at any order of $O(Λ_{\rm QCD}\left/m_Q\right.)$. We consider the contribution in the soft photon region that $E_γ \sim \left. Λ^2_{\rm QCD} /\right. m_Q$. The numerical results shows that, the soft photon region is very important for both the $B$ and $D$ mesons. The branching ratios of $B\to γeν_e$ is $5.21\times 10^{-6}$, which is about $3$ times of the result obtained by only considering the hard photon region $E_γ\sim m_Q$. And for the case of $D\to γeν_e$, the result of the branching ratio is $1.92\times 10^{-5}$.
description: arXiv admin note: text overlap with arXiv:1409.0358
title: Low contrast performance and image quality in abdominal CT imaging of filtered back projection (FBP) and adaptive statistical iterative reconstruction (ASiR): phantom and clinical comparison of primary image reconstruction to secondary image reformation
Creators: name: Geyer, Lucas
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Emergency
subject: Trauma
subject: Contrast agents
subject: CT
subject: Digital radiography
subject: Cholangiography
subject: Radiation safety
subject: Trauma
subject: Forensics

description: Purpose Methods and Materials Results Conclusion References Personal Information
description: Purpose: Since the introduction of submillimetric imagingand the resultinghigh resolution multiplanarreformations (MPR), proper data handling has become more and more important. Depending on the installedPACS, thick axial images can be obtaineddirectly...
Conformal symmetry breaking operators for differential forms on spheres
Creators: name: Kobayashi, Toshiyuki
name: Kubo, Toshihisa
name: Pevzner, Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 22E47, 22E46, 53A30, 53C10, 58J70

description: We give a complete classification of conformally covariant differential operators between the spaces of $i$-forms on the sphere $S^n$ and $j$-forms on the totally geodesic hypersphere $S^{n-1}$. Moreover, we find explicit formulæ for these new matrix-valued operators in the flat coordinates in terms of basic operators in differential geometry and classical orthogonal polynomials. We also establish matrix-valued factorization identities among all possible combinations of conformally covariant differential operators. The main machinery of the proof is the "F-method" based on the "algebraic Fourier transform of Verma modules" (Kobayashi-Pevzner [Selecta Math. 2016]) and its extension to matrix-valued case developed here. A short summary of the main results was announced in [C. R. Acad. Sci. Paris, 2016].
A flexible Bayesian g-formula for causal survival analyses with time-dependent confounding
Creators: name: Chen, Xinyuan
name: Hu, Liangyuan
name: Li, Fan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Methodology (stat.ME)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: In longitudinal observational studies with time-to-event outcomes, a common objective in causal analysis is to estimate the causal survival curve under hypothetical intervention scenarios. The g-formula is a useful tool for this analysis. To enhance the traditional parametric g-formula, we developed an alternative g-formula estimator, which incorporates the Bayesian Additive Regression Trees (BART) into the modeling of the time-evolving generative components, aiming to mitigate the bias due to model misspecification. We focus on binary time-varying treatments and introduce a general class of g-formulas for discrete survival data that can incorporate the longitudinal balancing scores. The minimum sufficient formulation of these longitudinal balancing scores is linked to the nature of treatment strategies, i.e., static or dynamic. For each type of treatment strategy, we provide posterior sampling algorithms. We conducted simulations to illustrate the empirical performance of the proposed method and demonstrate its practical utility using data from the Yale New Haven Health System's electronic health records.
Conclusive discrimination by $N$ sequential receivers between $r\geq2$ arbitrary quantum states
Creators: name: Loubenets, Elena R.
name: Namkung, Min
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the present article, we develop a general framework for the description of discrimination between $r\geq2$ quantum states by $N\geq1$ sequential receivers in the case where each receiver obtains a conclusive result. This type of discrimination constitutes an $N$-sequential extension of the minimum-error discrimination by one receiver. The developed general framework, which is valid for a conclusive discrimination between any number $r\geq2$ of arbitrary quantum states, pure or mixed, of an arbitrary dimension and any number $N\geq1$ of sequential receivers, is based on the notion of a quantum state instrument and this allows us to derive the new important general results. We, in particular, find a general condition on $r\geq2$ quantum states, under which, within the strategy where all types of receivers' quantum measurements are allowed, the optimal success probability is equal to that of the first receiver for any number $N\geq2$ of further sequential receivers. Furthermore, we extend our general framework to include an $N$-sequential conclusive discrimination between $r\geq2$ arbitrary quantum states under a noisy communication. As an example, we analyze analytically and numerically a two-sequential conclusive discrimination between two qubit states via depolarizing quantum channels. The derived new general results are important both from the theoretical point of view and for the development of a successful multipartite quantum communication via noisy quantum channels.
description: Improved and extended version, 29 pages
Schwaiger, G., Mönchtum, Orden, Klöster
Creators: name: Padberg, Lutz Von
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1821138414
description: Jahrbuch für evangelikale Theologie, V. 9 (1995): Jahrbuch für evangelikale Theologie, Band 9
title: Desquamative Interstitial Pneumonitis: Changes in High Resolution CT on Long Term Follow-up
Creators: name: oh, sang young
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Occupational / Environmental hazards
subject: Diagnostic procedure
subject: CT-High Resolution
subject: Thorax
subject: Respiratory system
subject: Lung

description: Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References
description: Learning objectives: •To assess the change in high resolution computed tomography (HRCT) findings of desquamative interstitial pneumonia (DIP) on long-term...
Indirect Constraints on the Scalar Di-Photon Resonance at the LHC
Creators: name: Goertz, Florian
name: Kamenik, Jernej F.
name: Katz, Andrey
name: Nardecchia, Marco
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Motivated by the tantalizing excesses recently reported in the di-photon invariant mass spectrum at the LHC, we scrutinize some implications of scalar di-photon resonances in high energy proton-proton collisions. In particular, indications of a large width impose several challenges for model building. We show how calculability and unitarity considerations severely limit possible perturbative realizations of such a signal and propose a simple criterion that can be adapted to any renormalizable model. Furthermore, we discuss correlations between a di-photon excess and precision observables, including the anomalous magnetic and electric dipole moments of quarks and leptons, neutral meson oscillations and radiative flavor changing neutral current mediated decays of heavy leptons and hadrons. We find that existing searches and measurements significantly constrain the possibilities for a scalar resonance decaying into final states involving Standard Model fermions. We propose future search strategies which could elucidate some remaining currently unconstrained decay channels and discuss possible correlations between the di-photon excess and several recently reported flavor anomalies, showing that the latter can be addressed in a new incarnation of a gauged $U(1)^\prime$ model, with the di-photon resonance being the physical remnant of the $U(1)^\prime$-breaking field.
description: 34 pages, 4 figures. Minor changes, version accepted in JHEP
Hoeppke, H.-J./Sauer, A. (Hg.), Glaubend leben
Creators: name: Klement, Herbert
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1821138058
description: Jahrbuch für evangelikale Theologie, V. 9 (1995): Jahrbuch für evangelikale Theologie, Band 9
Bieritz, K.-H., Das Kirchenjahr: Feste, Gedenk- und Feiertage in Geschichte und Gegenwart
Creators: name: Padberg, Lutz Von
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1821137736
description: Jahrbuch für evangelikale Theologie, V. 9 (1995): Jahrbuch für evangelikale Theologie, Band 9
A Generative Approach to Joint Modeling of Quantitative and Qualitative Responses
Creators: name: Kang, Xiaoning
name: Kang, Lulu
name: Chen, Wei
name: Deng, Xinwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In many scientific areas, data with quantitative and qualitative (QQ) responses are commonly encountered with a large number of predictors. By exploring the association between QQ responses, existing approaches often consider a joint model of QQ responses given the predictor variables. However, the dependency among predictive variables also provides useful information for modeling QQ responses. In this work, we propose a generative approach to model the joint distribution of the QQ responses and predictors. The proposed generative model provides efficient parameter estimation under a penalized likelihood framework. It achieves accurate classification for qualitative response and accurate prediction for quantitative response with efficient computation. Because of the generative approach framework, the asymptotic optimality of classification and prediction of the proposed method can be established under some regularity conditions. The performance of the proposed method is examined through simulations and real case studies in material science and genetics.
Hunting wino and higgsino dark matter at the muon collider with disappearing tracks
Creators: name: Capdevilla, Rodolfo
name: Meloni, Federico
name: Simoniello, Rosa
name: Zurita, Jose
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the capabilities of a muon collider experiment to detect disappearing tracks originating when a heavy and electrically charged long-lived particle decays via $X^+ \to Y^+ Z^0$, where $X^+$ and $Z^0$ are two almost mass degenerate new states and $Y^+$ is a charged Standard Model particle. The backgrounds induced by the in-flight decays of the muon beams (BIB) can create detector hit combinations that mimic long-lived particle signatures, making the search a daunting task. We design a simple strategy to tame the BIB, based on a detector-hit-level selection exploiting timing information and hit-to-hit correlations, followed by simple requirements on the quality of reconstructed tracks. Our strategy allows us to reduce the number of tracks from BIB to an average of 0.08 per event, hence being able to design a cut-and-count analysis that shows that it is possible to cover weak doublets and triplets with masses close to $\sqrt{s}/2$ in the 0.1-10 ns range. In particular, this implies that a 10 TeV muon collider is able to probe thermal MSSM higgsinos and thermal MSSM winos, thus rivaling the FCC-hh in that respect, and further enlarging the physics program of the muon collider into the territory of WIMP dark matter and long-lived signatures. We also provide parton-to-reconstructed level efficiency maps, allowing an estimation of the coverage of disappearing tracks at muon colliders for arbitrary models.
description: 32 pages, 18 figures, 3 tables, v2: corrected numerical error for non-integer log10(lifetime)
Coupling between Majorana fermions and Nambu-Goldstone bosons inside a non-Abelian vortex in dense QCD
Creators: name: Chatterjee, Chandrasekhar
name: Cipriani, Mattia
name: Nitta, Muneto
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quark matter at high density may exhibit color superconductivity. As magnetic flux tubes in metallic superconductors, color magnetic flux tubes as non-Abelian vortices appear in the color-flavor locked phase of high density QCD. ${\mathbb C}P^2$ Nambu-Goldstone bosons and Majorana fermions belonging to the triplet representation are known to be localized around a non-Abelian vortex. In this paper, we determine the coupling of these bosonic and fermionic modes by using the nonlinear realization method.
description: 14 pages, 1 figure
Batch-Schedule-Execute: On Optimizing Concurrent Deterministic Scheduling for Blockchains (Extended Version)
Creators: name: Hay, Yaron
name: Friedman, Roy
Publisher: name: arXiv
Year: 2024
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Executing smart contracts is a compute and storage-intensive task, which currently dominates modern blockchain's performance. Given that computers are becoming increasingly multicore, concurrency is an attractive approach to improve programs' execution runtime. A unique challenge of blockchains is that all replicas (miners or validators) must execute all smart contracts in the same logical order to maintain the semantics of State Machine Replication (SMR).
 In this work, we study the maximal level of parallelism attainable when focusing on the conflict graph between transactions packaged in the same block. This exposes a performance vulnerability that block creators may exploit against existing blockchain concurrency solutions, which rely on a total ordering phase for maintaining consistency amongst all replicas. To facilitate the formal aspects of our study, we develop a novel generic framework for Active State Machine Replication (ASMR) that is strictly serializable. We introduce the concept of graph scheduling and the definition of the minimal latency scheduling problem, which we prove to be NP-hard. We show that the restricted version of this problem for homogeneous transactions is equivalent to the classic Graph Vertex Coloring Problem, yet show that the heterogeneous case is more complex. We discuss the practical implications of these results.
description: Updated version for conference version; 53 pages, 12 figures, LaTeX with Auxiliary Files, short single line
Variational integrators for interconnected Lagrange-Dirac systems
Creators: name: Parks, Helen
name: Leok, Melvin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: Interconnected systems are an important class of mathematical models, as they allow for the construction of complex, hierarchical, multiphysics, and multiscale models by the interconnection of simpler subsystems. Lagrange--Dirac mechanical systems provide a broad category of mathematical models that are closed under interconnection, and in this paper, we develop a framework for the interconnection of discrete Lagrange--Dirac mechanical systems, with a view towards constructing geometric structure-preserving discretizations of interconnected systems. This work builds on previous work on the interconnection of continuous Lagrange--Dirac systems (Jacobs and Yoshimura 2014) and discrete Dirac variational integrators (Leok and Ohsawa 2011). We test our results by simulating some of the continuous examples given in Jacobs and Yoshimura 2014.
description: 29 pages, 11 figures
Direction-dependent conductivity in planar Hall set-ups with tilted Weyl/multi-Weyl semimetals
Creators: name: Ghosh, Rahul
name: Mandal, Ipsita
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the magnetoelectric conductivity tensors in planar Hall set-ups, which are built with tilted Weyl semimetals (WSMs) and multi-Weyl semimetals (mWSMs), considering all possible relative orientations of the electromagnetic fields ($\mathbf E $ and $\mathbf B $) and the direction of the tilt. The non-Drude part of the response arises from a nonzero Berry curvature in the vicinity of the WSM/mWSM node under consideration. Only in the presence of a nonzero tilt do we find linear-in-$ | \mathbf B| $ terms in set-ups where the tilt-axis is not perpendicular to the plane spanned by $\mathbf E $ and $ \mathbf B $. The advantage of the emergence of the linear-in-$ | \mathbf B| $ terms is that, unlike the various $| \mathbf B|^2 $-dependent terms that can contribute to experimental observations, they have purely a topological origin, and they dominate the overall response-characteristics in the realistic parameter regimes. The important signatures of these terms are that they (1) change the periodicity of the response from $π$ to $2π$, when we consider their dependence on the angle $θ$ between $\mathbf E $ and $\mathbf B $; and (2) lead to an overall change in sign of the conductivity depending on $θ$, when measured with respect to the $\mathbf B =0$ case.
description: some typos/errors involving units and parameter-values corrected; corrigendum appears at https://doi.org/10.1088/1361-648X/adc866
Developing the evidence base for a mobile health intervention to promote physical activity post-stroke
Creators: name: Douglas Carter, Daniel
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: BackgroundPhysical activity (PA) is a cornerstone of secondary stroke prevention; however, people post-stroke are often inactive. Mobile health (mHealth), e.g., smartphone and app-based interventions, has been proposed as an approach to support PA post-stroke.AimThis thesis aimed to identify and develop evidence for an app-based intervention to support PA post-stroke.MethodsThis research, set within the development stage of Medical Research Council (MRC) guidance for developing complex interventions, adopted a mixed-methods approach. First, a systematic review and meta-ethnography synthesised users’ experiences of app-based interventions to support PA. Second, a qualitative study, guided by a published protocol, thematically analysed stakeholder perspectives toward using apps to support PA post-stroke. Third, a systematic content analysis and quality appraisal reviewed commercial apps for PA post-stroke. Fourth, a cross-sectional study, using an existing dataset, explored associations between stroke and internet use. Lastly, a co-authored systematic review and meta-analysis examined the effectiveness of physical fitness training post-stroke.Findings The meta-ethnography identified user-perceived value in tailoring and customisation but found no stroke-related publications. The qualitative study indicated people post-stroke and clinicians were cautiously open to app-based interventions to support PA. The app review raised quality-related concerns in commercial app development. The cross-sectional study noted a majority of people post-stroke used the internet but detected challenges for digital inclusion. The meta-analysis demonstrated the effectiveness of cardiorespiratory and mixed training for post-stroke care.ConclusionsStakeholder perspectives demonstrated that mHealth could augment post-stroke care, particularly following the COVID-19 pandemic. Apps were identified which may be useful to stakeholders; however, these require further evaluation and formally recommending existing apps to stroke services is premature. This thesis provides guiding principles for developing the features and content of a PA app prototype. With a prototype, future research incorporating user involvement should focus on the next stage of MRC guidance, feasibility testing.
A refined continuity correction for the negative binomial distribution and asymptotics of the median
Creators: name: Ouimet, Frédéric
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 62E20, 62F12, 62F35, 62E15, 60F15, 62B15

description: In this paper, we prove a local limit theorem and a refined continuity correction for the negative binomial distribution. We present two applications of the results. First, we find the asymptotics of the median for a $\mathrm{Negative\hspace{0.5mm}Binomial}\hspace{0.2mm}(r,p)$ random variable jittered by a $\mathrm{Uniform}\hspace{0.2mm}(0,1)$, which answers a problem left open in Coeurjolly & Trépanier (2020). This is used to construct a simple, robust and consistent estimator of the parameter $p$, when $r > 0$ is known. The case where $r$ is unknown is also briefly covered. Second, we find an upper bound on the Le Cam distance between negative binomial and normal experiments.
description: 21 pages, 3 figures
Two dimensional quantum repeaters
Creators: name: Wallnöfer, J.
name: Zwerger, M.
name: Muschik, C.
name: Sangouard, N.
name: Dür, W.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The endeavour to develop quantum networks gave rise to a rapidly developing field with far reaching applications such as secure communication and the realisation of distributed computing tasks. This ultimately calls for the creation of flexible multi-user structures that allow for quantum communication between arbitrary pairs of parties in the network and facilitate also multi-user applications. To address this challenge, we propose a 2D quantum repeater architecture to establish long-distance entanglement shared between multiple communication partners in the presence of channel noise and imperfect local control operations. The scheme is based on the creation of self-similar multi-qubit entanglement structures at growing scale, where variants of entanglement swapping and multi-party entanglement purification are combined to create high fidelity entangled states. We show how such networks can be implemented using trapped ions in cavities.
description: 10+2 pages, 11+3 figures; V2: replaced with published version, improved and extended presentation
How does the chromatic number of a random graph vary?
Creators: name: Heckel, Annika
name: Riordan, Oliver
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15, 05C80

description: How does the chromatic number of a graph chosen uniformly at random from all graphs on $n$ vertices behave? This quantity is a random variable, so one can ask (i) for upper and lower bounds on its typical values, and (ii) for bounds on how much it varies: what is the width (e.g., standard deviation) of its distribution? On (i) there has been considerable progress over the last 45 years; on (ii), which is our focus here, remarkably little. One would like both upper and lower bounds on the width of the distribution, and ideally a description of the (appropriately scaled) limiting distribution. There is a well known upper bound of Shamir and Spencer of order $\sqrt{n}$, improved slightly by Alon to $\sqrt{n}/\log n$, but no non-trivial lower bound was known until 2019, when the first author proved that the width is at least $n^{1/4-o(1)}$ for infinitely many $n$, answering a longstanding question of Bollobás. In this paper we have two main aims: first, we shall prove a much stronger lower bound on the width. We shall show unconditionally that, for some values of $n$, the width is at least $n^{1/2-o(1)}$, matching the upper bounds up to the error term. Moreover, conditional on a recently announced sharper explicit estimate for the chromatic number, we improve the lower bound to order $\sqrt{n} \log \log n /\log^3 n$, within a logarithmic factor of the upper bound. Secondly, we will describe a number of conjectures as to what the true behaviour of the variation in $χ(G_{n,1/2})$ is, and why. The first form of this conjecture arises from recent work of Bollobás, Heckel, Morris, Panagiotou, Riordan and Smith. We will also give much more detailed conjectures, suggesting that the true width, for the worst case $n$, matches our lower bound up to a constant factor. These conjectures also predict a Gaussian limiting distribution.
description: 38 pages, 3 figures. Minor edits and corrections
Exploiting jet binning to identify the initial state of high-mass resonances
Creators: name: Ebert, Markus A.
name: Liebler, Stefan
name: Moult, Ian
name: Stewart, Iain W.
name: Tackmann, Frank J.
name: Tackmann, Kerstin
name: Zeune, Lisa
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: If a new high-mass resonance is discovered at the Large Hadron Collider, model-independent techniques to identify the production mechanism will be crucial to understand its nature and effective couplings to Standard Model particles. We present a powerful and model-independent method to infer the initial state in the production of any high-mass color-singlet system by using a tight veto on accompanying hadronic jets to divide the data into two mutually exclusive event samples (jet bins). For a resonance of several hundred GeV, the jet binning cut needed to discriminate quark and gluon initial states is in the experimentally accessible range of several tens of GeV. It also yields comparable cross sections for both bins, making this method viable already with the small event samples available shortly after a discovery. Theoretically, the method is made feasible by utilizing an effective field theory setup to compute the jet cut dependence precisely and model independently and to systematically control all sources of theoretical uncertainties in the jet binning, as well as their correlations. We use a 750 GeV scalar resonance as an example to demonstrate the viability of our method.
description: 6 pages, 2 figures, v2: journal version
Detectable MeV neutrinos from black hole neutrino-dominated accretion flows
Creators: name: Liu, Tong
name: Zhang, Bing
name: Li, Ye
name: Ma, Ren-Yi
name: Xue, Li
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes (BHs) have been theorized as the central engine of relativistic jets launched in massive star core collapse events or compact star mergers. In this work, we calculate the electron neutrino/anti-neutrino spectra of NDAFs by fully taking into account the general relativistic effects, and investigate the effects of viewing angle, BH spin, and mass accretion rate on the results. We show that even though a typical NDAF has a neutrino luminosity lower than that of a typical supernova (SN), it can reach $10^{50}-10^{51}~{\rm erg~s^{-1}}$ peaking at $\sim 10$ MeV, making them potentially detectable with the upcoming sensitive MeV neutrino detectors if they are close enough to Earth. Based on the observed GRB event rate in the local universe and requiring that at least 3 neutrinos are detected to claim a detection, we estimate a detection rate up to $\sim$ (0.10-0.25) per century for GRB-related NDAFs by the Hyper-Kamiokande (Hyper-K) detector if one neglects neutrino oscillation. If one assumes that all Type Ib/c SNe have an engine-driven NDAF, the Hyper-K detection rate would be $\sim$ (1-3) per century. By considering neutrino oscillations, the detection rate may decrease by a factor of 2-3. Detecting one such event would establish the observational evidence of NDAFs in the universe.
description: 7 pages, 2 figures, 2 tables, accepted for publication in PRD
Magnetic field and early evolution of circumstellar disks
Creators: name: Tsukamoto, Yusuke
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The magnetic field plays a central role in the formation and evolution of circumstellar disks. The magnetic field connects the rapidly rotating central region with the outer envelope and extracts angular momentum from the central region during gravitational collapse of the cloud core. This process is known as magnetic braking. Both analytical and multidimensional simulations have shown that disk formation is strongly suppressed by magnetic braking in moderately magnetized cloud cores in the ideal magnetohydrodynamic limit. On the other hand, recent observations have provided growing evidence of a relatively large disk several tens of astronomical units in size existing in some Class 0 young stellar objects. This introduces a serious discrepancy between the theoretical study and observations. Various physical mechanisms have been proposed to solve the problem of catastrophic magnetic braking, such as misalignment between the magnetic field and the rotation axis, turbulence, and non-ideal effect. In this paper, we review the mechanism of magnetic braking, its effect on disk formation and early evolution, and the mechanisms that resolve the magnetic braking problem. In particular, we emphasize the importance of non-ideal effects. The combination of magnetic diffusion and thermal evolution during gravitational collapse provides a robust formation process for the circumstellar disk at the very early phase of protostar formation. The rotation induced by the Hall effect can supply a sufficient amount of angular momentum for typical circumstellar disks around T Tauri stars. By examining the combination of the suggested mechanisms, we conclude that the circumstellar disks commonly form in the very early phase of protostar formation.
description: 17 pages, 12 figures. accepted for publication in PASA as part of the special issue on "Disc dynamics and planet formation". Journal reference is added
Hypocoercivity and controllability in linear semi-dissipative Hamiltonian ODEs and DAEs
Creators: name: Achleitner, Franz
name: Arnold, Anton
name: Mehrmann, Volker
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 34A30, Secondary 34C11, 15A22, 15A21

description: For the classes of finite dimensional linear time-invariant semi-dissipative Hamiltonian ordinary differential equations and differential-algebraic equations, stability and hypocoercivity are discussed and related to concepts from control theory. On the basis of staircase forms the solution behavior is characterized and connected to the hypocoercivity index of these evolution equations. The results are applied to two infinite dimensional flow problems.
description: New version contains additional references and remarks
Rapid Exponential Stabilization of a Boussinesq System of KdV--KdV Type
Creators: name: Filho, Roberto de A. Capistrano
name: Cerpa, Eduardo
name: Gallego, Fernando A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 93D15, 35Q53, 93B05

description: This paper studies the exponential stabilization of a Boussinesq system describing the two-way propagation of small amplitude gravity waves on the surface of an ideal fluid, the so-called Boussinesq system of the Korteweg-de Vries type. We use a Gramian-based method introduced by Urquiza to design our feedback control. By means of spectral analysis and Fourier expansion, we show that the solutions of the linearized system decay uniformly to zero when the feedback control is applied. The decay rate can be chosen as large as we want. The main novelty of our work is that we can exponentially stabilize this system of two coupled equations using only one scalar input.
Geometric methods for efficient planar swimming of copepod nauplii
Creators: name: Balisacan, Jonas
name: Chyba, Monique
name: Shanbrom, Corey
name: Wilkens, George
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Copepod nauplii are larval crustaceans with important ecological functions. Due to their small size, they experience an environment of low Reynolds number within their aquatic habitat. Here we provide a mathematical model of a swimming copepod nauplius with two legs moving in a plane. This model allows for both rotation and two-dimensional displacement by periodic deformation of the swimmer's body. The system is studied from the framework of optimal control theory, with a simple cost function designed to approximate the mechanical energy expended by the copepod. We find that this model is sufficiently realistic to recreate behavior similar to those of observed copepod nauplii, yet much of the mathematical analysis is tractable. In particular, we show that the system is controllable, but there exist singular configurations where the degree of non-holonomy is non-generic. We also partially characterize the abnormal extremals and provide explicit examples of families of abnormal curves. Finally, we numerically simulate normal extremals and observe some interesting and surprising phenomena.
description: 17 pages, 9 figures
Is there room for CP violation in the top-Higgs sector?
Creators: name: Cirigliano, V.
name: Dekens, W.
name: de Vries, J.
name: Mereghetti, E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss direct and indirect probes of chirality-flipping couplings of the top quark to Higgs and gauge bosons, considering both CP-conserving and CP-violating observables, in the framework of the Standard Model effective field theory. In our analysis we include current and prospective constraints from collider physics, precision electroweak tests, flavor physics, and electric dipole moments (EDMs). We find that low-energy indirect probes are very competitive, even after accounting for long-distance uncertainties. In particular, EDMs put constraints on the electroweak CP-violating dipole moments of the top that are two to three orders of magnitude stronger than existing limits. The new indirect constraint on the top EDM is given by $|d_t| < 5 \cdot 10^{-20}$ e cm at $90\%$ C.L.
description: Published version
title: André Ribeiro Coutinho
Creators: name: Losa Mendiratta, Sidh Daniel
name: Araujo, Renata
Publisher: name: CHAM, Faculdade de Ciências Sociais e Humanas, Universidade NOVA de Lisboa
Year: 2022

description: Entrada biográfica sobre André Ribeiro Coutinho, na plataforma eViterbo
description: Mendiratta, Sidh Losa. Araújo, Renata Malcher de. 2022. André Ribeiro Coutinho. In eViterbo. CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa. eISBN: 978-989-8492-77-7
title: Paroxysmal Nocturnal Haemoglobinuria (PNH): The Contribution of Magnetic Resonance(MR)
Creators: name: Alcolado Jaramillo, Ana María
Publisher: name: European Congress of Radiology
Year: 2012
Subjects: subject: Embolism / Thrombosis
subject: Genetic defects
subject: Haematologic diseases
subject: Imaging sequences
subject: Contrast agent-intravenous
subject: MR-Angiography
subject: MR
subject: Kidney
subject: Liver

description: Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References
description: Learning objectives: The technical advances of Magnetic Resonance Images (MRI) allow Magnetic Resonance (MR)to become the ideal technique for global management of patients with suspected or diagnosed Paroxysmal Nocturnal Hemoglobinuria (PNH) Our objectives are:...