cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
G-flux and Spectral Divisors
Creators: name: Kuntzler, Moritz
name: Schafer-Nameki, Sakura
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a construction of G-flux in singular elliptic Calabi-Yau fourfold compactifications of F-theory, which in the local limit allow a spectral cover description. The main tool of construction is the so-called spectral divisor in the resolved Calabi-Yau geometry, which in the local limit reduces to the Higgs bundle spectral cover. We exemplify the workings of this in the case of an E_6 singularity by constructing the resolved geometry, the spectral divisor and in the local limit, the spectral cover. The G-flux constructed with the spectral divisor is shown to be equivalent to the direct construction from suitably quantized linear combinations of holomorphic surfaces in the resolved geometry, and in the local limit reduces to the spectral cover flux.
description: 30 pages
The Provable Security of Ed25519: Theory and Practice
Creators: name: Brendel, Jacqueline
name: Cremers, Cas
name: Jackson, Dennis
name: Zhao, Mang
Publisher: name: CISPA
Year: 2023

description: A standard requirement for a signature scheme is that it is existentially unforgeable under chosen message attacks (EUF-CMA), alongside other properties of interest such as strong unforgeability (SUF-CMA), and resilience against key substitution attacks. Remarkably, no detailed proofs have ever been given for these security properties for EdDSA, and in particular its Ed25519 instantiations. Ed25519 is one of the most efficient and widely used signature schemes, and different instantiations of Ed25519 are used in protocols such as TLS 1.3, SSH, Tor, ZCash, and WhatsApp/Signal. The differences between these instantiations are subtle, and only supported by informal arguments, with many works assuming results can be directly transferred from Schnorr signatures. Similarly, several proofs of protocol security simply assume that Ed25519 satisfies properties such as EUF-CMA or SUF-CMA. In this work we provide the first detailed analysis and security proofs of Ed25519 signature schemes. While the design of the schemes follows the well-established Fiat-Shamir paradigm, which should guarantee existential unforgeability, there are many side cases and encoding details that complicate the proofs, and all other security properties needed to be proven independently. Our work provides scientific rationale for choosing among several Ed25519 variants and understanding their properties, fills a much needed proof gap in modern protocol proofs that use these signatures, and supports further standardisation efforts.
Idling Erodible Cropland: Impacts on Production, Prices, and Government Costs
Creators: name: Webb, Shwu-Eng H.
name: Ogg, Clayton W.
name: Huang, Wen-Yuan
name: Webb, Shwu-Eng H.
name: Ogg, Clayton W.
name: Huang, Wen-Yuan
Publisher: name: Unknown
Year: 1986
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: Land Economics/Use
subject: Production Economics
subject: erodible
subject: land group
subject: conservation reserve
subject: linear programming
subject: erosion
subject: deficiency
subject: surplus
subject: cropland

description: A Government program to put erodible land into a conservation reserve would reduce soil erosion and complement the goals of commodity programs by supporting crop prices and reducing Government deficiency and storage payments. To identify erodible and fragile land, this study developed land group criteria that link productivity with potential soil erodibility. About 32 million acres of U.S. cropland were identified as highly erodible and fragile. The study then estimated the impact of idling those acres on production and prices for seven major crops (corn, soybeans, wheat, sorghum, oats, barley, and cotton) under assumptions generally consistent with recent farm legislation.
Enhanced Publication Content for the manuscript: Oral tyrosine kinase 2 inhibitor PF-06826647 demonstrates efficacy and an acceptable safety profile in participants with moderate-to-severe plaque psoriasis in a phase 2b, randomized, double-blind, placebo-controlled study
Creators: name: Tehlirian, Christopher
name: Singh, Ravi Shankar P
name: Pradhan, Vivek
name: Roberts, Erika S
name: Tarabar, Sanela
name: Peeva, Elena
name: Vincent, Michael S
name: Gale, Jeremy D
Publisher: name: Pfizer
Year: 2022
Subjects: Dermatology

description: This is an infographic abstract (a subset of EPC) of an article published in a peer-reviewed scientific journal. This infographic abstract is not peer-reviewed. The publisher of the original manuscript was not involved in the preparation of this infographic abstract and has neither reviewed nor approved its content.
Non-Beiter ternary cyclotomic polynomials with an optimally large set of coefficients
Creators: name: Moree, Pieter
name: Rosu, Eugenia
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11N37, 11B83

description: Let l>=1 be an arbitrary odd integer and p,q and r primes. We show that there exist infinitely many ternary cyclotomic polynomials Φ_{pqr}(x) with l^2+3l+5<= p
description: 20 pages, 7 Tables
Using artificial neural networks for open-loop tomography
Creators: name: Osborn, James
name: Juez, Francisco Javier De Cos
name: Guzman, Dani
name: Butterley, Timothy
name: Myers, Richard
name: Guesalaga, Andres
name: Laine, Jesus
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Modern adaptive optics (AO) systems for large telescopes require tomographic techniques to reconstruct the phase aberrations induced by the turbulent atmosphere along a line of sight to a target which is angularly separated from the guide sources that are used to sample the atmosphere. Multi-object adaptive optics (MOAO) is one such technique. Here, we present a method which uses an artificial neural network (ANN) to reconstruct the target phase given off-axis references sources. We compare our ANN method with a standard least squares type matrix multiplication method and to the learn and apply method developed for the CANARY MOAO instrument. The ANN is trained with a large range of possible turbulent layer positions and therefore does not require any input of the optical turbulence profile. It is therefore less susceptible to changing conditions than some existing methods. We also exploit the non-linear response of the ANN to make it more robust to noisy centroid measurements than other linear techniques.
description: 15 pages, 11 figures, submitted Optics Express 6/10/11
A refinement of the Cameron-Erdős Conjecture
Creators: name: Alon, Noga
name: Balogh, József
name: Morris, Robert
name: Samotij, Wojciech
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper we study sum-free subsets of the set $\{1,...,n\}$, that is, subsets of the first $n$ positive integers which contain no solution to the equation $x + y = z$. Cameron and Erdős conjectured in 1990 that the number of such sets is $O(2^{n/2})$. This conjecture was confirmed by Green and, independently, by Sapozhenko. Here we prove a refined version of their theorem, by showing that the number of sum-free subsets of $[n]$ of size $m$ is $2^{O(n/m)} {\lceil n/2 \rceil \choose m}$, for every $1 \le m \le \lceil n/2 \rceil$. For $m \ge \sqrt{n}$, this result is sharp up to the constant implicit in the $O(\cdot)$. Our proof uses a general bound on the number of independent sets of size $m$ in 3-uniform hypergraphs, proved recently by the authors, and new bounds on the number of integer partitions with small sumset.
description: 32 pages
Accountability in the Decentralised-Adversary Setting
Creators: name: Künnemann, Robert
name: Garg, Deepak
name: Backes, Michael
Publisher: name: CISPA
Year: 2023

description: A promising paradigm in protocol design is to hold parties accountable for misbehavior, instead of postulating that they are trustworthy. Recent approaches in defining this property, called accountability, characterized malicious behavior as a deviation from the protocol that causes a violation of the desired security property, but did so under the assumption that all deviating parties are controlled by a single, centralized adversary. In this work, we investigate the setting where multiple parties can deviate with or without coordination in a variant of the applied-π calculus. We first demonstrate that, under realistic assumptions, it is impossible to determine all misbehaving parties; however, we show that accountability can be relaxed to exclude causal dependencies that arise from the behavior of deviating parties, and not from the protocol as specified. We map out the design space for the relaxation, point out protocol classes separating these notions and define conditions under which we can guarantee fairness and completeness. Most importantly, we discover under which circumstances it is correct to consider accountability in the single-adversary setting, where this property can be verified with off-the-shelf protocol verification tools.
On the partition dimension of trees
Creators: name: Rodriguez-Velazquez, Juan A.
name: Yero, Ismael G.
name: Lemanska, Magdalena
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C12

description: Given an ordered partition $Π=\{P_1,P_2, ...,P_t\}$ of the vertex set $V$ of a connected graph $G=(V,E)$, the \emph{partition representation} of a vertex $v\in V$ with respect to the partition $Π$ is the vector $r(v|Π)=(d(v,P_1),d(v,P_2),...,d(v,P_t))$, where $d(v,P_i)$ represents the distance between the vertex $v$ and the set $P_i$. A partition $Π$ of $V$ is a \emph{resolving partition} of $G$ if different vertices of $G$ have different partition representations, i.e., for every pair of vertices $u,v\in V$, $r(u|Π)\ne r(v|Π)$. The \emph{partition dimension} of $G$ is the minimum number of sets in any resolving partition of $G$. In this paper we obtain several tight bounds on the partition dimension of trees.
Quantum gravity stability of isotropy in homogeneous cosmology
Creators: name: Broda, Bogusław
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been shown that anisotropy of homogeneous spacetime described by the general Kasner metric can be damped by quantum fluctuations coming from perturbative quantum gravity in one-loop approximation. Also, a formal argument, not limited to one-loop approximation, is put forward in favor of stability of isotropy in the exactly isotropic case.
description: 9 pages, 1 figure
Discovering Fully Oriented Causal Networks
Creators: name: Mian, Osman
name: Marx, Alexander
name: Vreeken, Jilles
Publisher: name: CISPA
Year: 2023

description: We study the problem of inferring causal graphs from observational data. We are particularly interested in discovering graphs where all edges are oriented, as opposed to the partially directed graph that the state of the art discover. To this end we base our approach on the algorithmic Markov condition. Unlike the statistical Markov condition, it uniquely identifies the true causal network as the one that provides the simplest---as measured in Kolmogorov complexity---factorization of the joint distribution. Although Kolmogorov complexity is not computable, we can approximate it from above via the Minimum Description Length principle, which allows us to define a consistent and computable score based on non-parametric multivariate regression. To efficiently discover causal networks in practice, we introduce the Globe algorithm, which greedily adds, removes, and orients edges such that it minimizes the overall cost. Through an extensive set of experiments we show Globe performs very well in practice, beating the state of the art by a margin.
Spectacle cycles with coefficients and modular forms of half-integral weight
Creators: name: Funke, Jens
name: Millson, John
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F27, 11F37

description: In this paper we present a geometric way to extend the Shintani lift from even weight cusp forms for congruence subgroups to arbitrary modular forms, in particular Eisenstein series. This is part of our efforts to extend in the noncompact situation the results of Kudla-Millson and Funke-Millson relating Fourier coefficients of (Siegel) modular forms with intersection numbers of cycles (with coefficients) on orthogonal locally symmetric spaces. In the present paper, the cycles in question are the classical modular symbols with nontrivial coefficients. We introduce "capped" modular symbols with coefficients which we call "spectacle cycles" and show that the generating series of cohomological periods of any modular form over the spectacle cycles is a modular form of half-integral weight. In the last section of the paper we develop a new simplicial homology theory with local coefficients (that are not locally constant) that allows us to extend the above results to orbifold quotients of the upper half plane.
Can the conformal factor of the gravitational field be a physical degree of freedom?
Creators: name: Forte, Mónica I.
name: Laciana, Carlos E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The role of the conformal factor was analysed in two gauge-invariant perturbative formulations. Using the classical and quantum linearized perturbation approach given by Mukhanov et al \cite{Mukhanov:1990me}, the non-physical behaviour of the conformal perturbation as an isolated degree of freedom is shown. In the quantum gravity context, the restriction to conformal perturbations gives us an incompatibility with the dynamical equations.
description: Printed in the UK PII: S0264-9381(99)02795-1
Why Eve and Mallory Still Love Android: Revisiting TLS (In)Security in Android Applications
Creators: name: Oltrogge, Marten
name: Huaman, Nicolas
name: Amft, Sabrina
name: Acar, Yasemin
name: Backes, Michael
name: Fahl, Sascha
Publisher: name: CISPA
Year: 2023

description: Android applications have a long history of being vulnerable to man-in-the-middle attacks due to insecure custom TLS certificate validation implementations. To resolve this, Google deployed the Network Security Configuration (NSC), a configuration-based approach to increase custom certificate validation logic security, and implemented safeguards in Google Play to block insecure applications. In this paper, we perform a large-scale in-depth investigation of the effectiveness of these countermeasures: First, we investigate the security of 99,212 NSC settings files in 1,335,322 Google Play apps using static code and manual analysis techniques. We find that 88.87% of the apps using custom NSC settings downgrade security compared to the default settings, and only 0.67% implement certificate pinning. Second, we penetrate Google Play’s protection mechanisms by trying to publish apps that are vulnerable to man-in-the-middle attacks. In contrast to official announcements by Google, we found that Play does not effectively block vulnerable apps. Finally, we performed a static code analysis study of 15,000 apps and find that 5,511 recently published apps still contain vulnerable certificate validation code. Overall, we attribute most of the problems we find to insufficient support for developers, missing clarification of security risks in official documentation, and inadequate security checks for vulnerable applications in Google Play.
Frequency Dependent Vertex Functions of the (t,t')-Hubbard Model at Weak Coupling
Creators: name: Husemann, Christoph
name: Giering, Kay-Uwe
name: Salmhofer, Manfred
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a functional renormalization group calculation for the two-dimensional (t,t')-Hubbard model at Van Hove filling. Using a channel decomposition we describe the momentum and frequency dependence of the vertex function in the normal phase. Compared to previous studies that neglect frequency dependences we find higher pseudo-critical scales and a smaller region of d-wave superconductivity. A large contribution to the effective interaction is given by a forward scattering process with finite frequency exchange. We test different frequency parameterizations and in a second calculation include the frequency dependence of the imaginary self-energy. We also generalize the channel decomposition to frequency-dependent fermion-boson vertex functions.
description: 37 pages, 11 figures
MPEC 2023-H122 : DAILY ORBIT UPDATE (2023 April 21)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Quantization of area for event and Cauchy horizons of the Kerr-Newman black hole
Creators: name: Visser, Matt
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Based on various string theoretic constructions, and various string-inspired generalizations thereof, there have been repeated suggestions that the areas of black hole event horizons might be quantized in a quite specific manner, in terms of linear combinations of square roots of positive integers. It is important to realise that there are significant physical constraints on such integer-based proposals when one (somewhat speculatively) attempts to extend them outside their original extremal and supersymmetric framework. Specifically, in their most natural and direct physical interpretations, some of the more speculative integer-based proposals for the quantization of horizon areas fail for the ordinary Kerr-Newman black holes in (3+1) dimensions, essentially because the fine structure constant is not an integer. A more baroque interpretation involves asserting the fine structure constant is the square root of a rational number; but such a proposal has its own problems. Insofar as one takes (3+1) general relativity (plus the usual quantization of angular momentum and electric charge) as being paramount, the known explicitly calculable spectra of horizon areas for the physically compelling Kerr-Newman spacetimes indicate that some caution is called for when assessing the universality of some of the more speculative integer-based string-inspired proposals.
description: v1: 15 pages; v2: 2 references added, no physics changes; v3: 16 now pages, discussion of physical implications clarified, no calculational changes, this version accepted for publication in JHEP
UV-driven chemistry in simulations of the interstellar medium. I. Post-processed chemistry with the Meudon PDR code
Creators: name: Levrier, François
name: Petit, Franck Le
name: Hennebelle, Patrick
name: Lesaffre, Pierre
name: Gerin, Maryvonne
name: Falgarone, Edith
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Our main purpose is to estimate the effect of assuming uniform density on the line-of-sight in PDR chemistry models, compared to a more realistic distribution for which total gas densities may well vary by several orders of magnitude. A secondary goal of this paper is to estimate the amount of molecular hydrogen which is not properly traced by the CO (J = 1 -> 0) line, the so-called "dark molecular gas". We use results from a magnetohydrodynamical (MHD) simulation as a model for the density structures found in a turbulent diffuse ISM with no star-formation activity. The Meudon PDR code is then applied to a number of lines of sight through this model, to derive their chemical structures. It is found that, compared to the uniform density assumption, maximal chemical abundances for H2, CO, CH and CN are increased by a factor 2 to 4 when taking into account density fluctuations on the line of sight. The correlations between column densities of CO, CH and CN with respect to those of H2 are also found to be in better overall agreement with observations. For instance, at N(H2) > 2.10^{20} cm-2, while observations suggest that d[log N(CO)]=d[log N(H2)] = 3.07 +/- 0.73, we find d[log N(CO)]=d[log N(H2)] =14 when assuming uniform density, and d[log N(CO)]=d[log N(H2)] = 5.2 when including density fluctuations.
description: 14 pages, 16 figures, accepted for publication in Astronomy & Astrophysics
Designing adaptive interfaces for children : a preliminary study on the effect of age and gender on children’s interaction in the context of dialoguing with computers
Creators: name: Rajamanickam, Mohan Raj
Publisher: name: University of British Columbia
Year: 2011

description: Software targeted at children does not typically take into consideration the significant variation in skills and capabilities across age and gender. The overall goal of our research was to design adaptive interfaces that change to accommodate the inherent age and gender differences among children. We conducted two studies towards this goal at Science World with 195 children between ages 3 to 12. In the first exploratory study, we observed how 111 children interacted with Tux Paint, a painting application designed for children, and the difficulties they encountered in general. We were also interested in the possibility of accelerating children's learning of the interface with the least help from adults. Hence, we observed how they used the help system and how they learned by watching their peers. We found that designing an effective help system for children was a tricky proposition fraught with challenges. As for our inquiry into the general difficulties, we identified that dialogs were a significant source of problems for children. We classified the problems with dialogs by age groups and set out to solve them with potential design solutions targeted at three different age groups. In the second observational study, we observed how 84 children interacted with our various dialog box designs embodying 8 design factors. The dialog boxes were designed with the goal of enabling efficient communication of information; children need to understand the information that is communicated and make informed decisions. We found that while some design factors helped achieve effective communication, some did not. We present our results and an analysis of children‟s information consumption behavior, especially with respect to age and gender differences, in the context of their interaction with dialog boxes. We put forth theories and present models on how children of different age and gender consumed information differently from different information channels (textual and non-textual). We discuss the design implications of our findings that could help designers in constructing adaptive interfaces that improve the interaction by taking the age and gender into account.
Time-resolved one-dimensional detection of x-ray scattering in pulsed magnetic fields
Creators: name: Islam, Zahirul
name: Ruff, Jacob P. C.
name: Ross, Kate A.
name: Nojiri, Hiroyuki
name: Gaulin, Bruce D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have developed an application of a one-dimensional micro-strip detector for capturing x-ray diffraction data in pulsed magnetic fields. This detector consists of a large array of 50 μm-wide Si strips with a full-frame read out at 20 kHz. Its use substantially improves data-collection efficiency and quality as compared to point detectors, because diffraction signals are recorded along an arc in reciprocal space in a time-resolved manner. By synchronizing with pulsed fields, the entire field dependence of a two-dimensional swath of reciprocal space may be determined using a small number of field pulses.
description: Submitted to Rev. Sci. Instrum
Distinct behaviors of suppression to superconductivity in $LaRu_3Si_2$ induced by Fe and Co dopants
Creators: name: Li, Sheng
name: Tao, Jian
name: Wan, Xiangang
name: Ding, Xiaxin
name: Yang, Huan
name: Wen, Hai-Hu
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In the superconductor LaRu$_3$Si$_2$ with the Kagome lattice of Ru, we have successfully doped the Ru with Fe and Co atoms. Contrasting behaviors of suppression to superconductivity is discovered between the Fe and the Co dopants: Fe-impurities can suppress the superconductivity completely at a doping level of only 3%, while the superconductivity is suppressed slowly with the Co dopants. A systematic magnetization measurements indicate that the doped Fe impurities lead to spin-polarized electrons yielding magnetic moments with the magnitude of 1.6 $μ_B$\ per Fe, while the electrons given by the Co dopants have the same density of states for spin-up and spin-down leading to much weaker magnetic moments. It is the strong local magnetic moments given by the Fe-dopants that suppress the superconductivity. The band structure calculation further supports this conclusion.
description: 6 pages, 7 figures
Guidelines of Accessing EATRIS Health Technology Assessment (HTA) Service (D4.2)
Creators: name: Restelli, Umberto
name: Silvola, Sofia
name: Mondino, Anna
name: Banfi, Giuseppe
name: Bietrix, Florence
name: Keidong, Eliis
Publisher: name: Zenodo
Year: 2021
Subjects: Health Technology Assessment
HTA
Research Infrastructure Services
RI
EATRIS
HSR

description: One of the main aims of EATRIS-Plus project is to expand EATRIS’s catalogue of services to better support the research community, as well as ensure the organisation’s sustainability. In this light Task 4.3: Expand catalogue of services: the setting up of EATRIS Health Technology Assessment (HTA) Task Force in WP4 – Long-term Sustainability Planning is contributing to this goal from the Health Technology Analysis perspective. Within this task the Deliverable 4.2: Guidelines for accessing HTA services describes the specific details of the service. This project deliverable is now a webpage on EATRIS-ERIC website: https://eatris.eu/services/health-technology-assessment/
Observing gravitational lensing effects by Sgr A* with GRAVITY
Creators: name: Bozza, V.
name: Mancini, L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The massive black hole at the Galactic center Sgr A* is surrounded by a cluster of stars orbiting around it. Light from these stars is bent by the gravitational field of the black hole, giving rise to several phenomena: astrometric displacement of the primary image, the creation of a secondary image that may shift the centroid of Sgr A*, magnification effects on both images. The near-to-come second generation VLTI instrument GRAVITY will perform observations in the Near Infrared of the Galactic Center at unprecedented resolution, opening the possibility of observing such effects. Here we investigate the observability limits for GRAVITY of gravitational lensing effects on the S-stars in the parameter space [DLS,gamma,K], where DLS is the distance between the lens and the source, gamma is the alignment angle of the source, and K is the source apparent magnitude in the K-band. The easiest effect to be observed in the next years is the astrometric displacement of primary images. In particular the shift of the star S17 from its Keplerian orbit will be detected as soon as GRAVITY becomes operative. For exceptional configurations it will be possible to detect effects related to the spin of the black hole or Post-Newtonian orders in the deflection.
description: 29 pages, 9 figures, in press on ApJ
A precise isospin analysis of B -> Dbar(*) D(*) K decays
Creators: name: Poireau, Vincent
name: Zito, Marco
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a precise isospin analysis of the B -> Dbar(*) D(*) K decays using new recent experimental measurements on these final states. The decays B -> Dbar(*) D(*) K, originating from b -> c cbar s transitions, are linked by a rich set of isospin properties. The isospin relations that connect the decay modes are presented and a fit is performed to obtain the isospin amplitudes and phases. We discuss the results of the fit and present a new measurement of the ratio of branching fractions BR(Upsilon(4S) -> B+ B-) and BR(Upsilon(4S) -> B0 B0bar). We finally discuss the implications of our findings for the measurement of the unitarity matrix parameters sin(2 beta) and cos(2 beta) using these decays.
description: 14 pages, 6 figures, results include now Babar and Belle measurements, published in Physics Letters B. arXiv admin note: substantial text overlap with arXiv:hep-ph/0401014
Expanding polynomials over finite fields of large characteristic, and a regularity lemma for definable sets
Creators: name: Tao, Terence
Publisher: name: Faculty of Science, University of Calgary
Year: 2015
Subjects: Regularity lemma; etale fundamental group; algebraic varieties; expander graphs

description: Let $P: \F \times \F \to \F$ be a polynomial of bounded degree over a finite field $\F$ of large characteristic.  In this paper we establish the following dichotomy: either $P$ is a \emph{moderate asymmetric expander} in the sense that $|P(A,B)| \gg |\F|$ whenever $A, B \subset \F$ are such that $|A| |B| \geq C |\F|^{2-1/8}$ for a sufficiently large $C$, or else $P$ takes the form $P(x,y) = Q(F(x)+G(y))$ or $P(x,y) = Q(F(x) G(y))$ for some polynomials $Q,F,G$.  This is a reasonably satisfactory classification of polynomials of two variables that moderately expand (either symmetrically or asymmetrically).  We obtain a similar classification for weak expansion (in which one has $|P(A,A)| \gg |A|^{1/2} |\F|^{1/2}$ whenever $|A| \geq C |\F|^{1-1/16}$), and a partially satisfactory classification for almost strong asymmetric expansion (in which $|P(A,B)| = (1-O(|\F|^{-c})) |\F|$ when $|A|, |B| \geq |\F|^{1-c}$ for some small absolute constant $c>0$).

The main new tool used to establish these results is an \emph{algebraic regularity lemma} that describes the structure of dense graphs generated by definable subsets over finite fields of large characteristic.  This lemma strengthens the Sz\'emeredi regularity lemma in the algebraic case, in that while the latter lemma decomposes a graph into a bounded number of components, most of which are $\eps$-regular for some small but fixed $\epsilon$, the former lemma ensures that all of the components are $O(|\F|^{-1/4})$-regular.  This lemma, which may be of independent interest, relies on some basic facts about the \'etale fundamental group of an algebraic variety.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
Automatic analysis of flow cytometry data and its application to lymphoma diagnosis
Creators: name: Zare, Habil
Publisher: name: University of British Columbia
Year: 2011

description: Flow cytometry has many applications in clinical medicine and biological research. For many modern applications, traditional methods of manual data interpretation are not efficient due to the large amount of complex, high dimensional data. In this thesis, I discuss some of the important challenges towards automatic analysis of flow cytometry data and propose my solutions. To validate my approach on addressing real life problems, I developed an automatic pipeline for analyzing flow cytometry data and applied it to clinical data. My pipeline can potentially be useful for improving quality check on diagnosis, assisting discovery of novel phenotypes, and making clinical recommendations. Furthermore, some of the challenges that I studied are rooted in more general areas of computer science, and therefore, the tools and techniques that I developed can be applied to a wider range of problems in data mining and machine learning. Enhancement to spectral clustering algorithm and proposing a novel scheme for scoring features are two examples of my contributions to computer science that were developed as part of this thesis.
Infrastructure for sharing infested seed lots for test development and validation (Shareseeds)
Creators: name: Sérandat, Isabelle
name: Foucher, Justine
Publisher: name: Zenodo
Year: 2023
Subjects: Euphresco, plant health, diagnostics, collection, reference material, seeds, test performance study

description: Slide of Euphresco project 2021-A-377 'Infrastructure for sharing infested seed lots for test development and validation (Shareseeds)'
description: Project funded through the Euphresco network
title: Séminaire
Publisher: name: groupe de travail notebook
Year: 2024

description: Le groupe de travail Notebook (gt notebook) s’est consitué autour d’un projet d’atelier documenté et reproductible réalisé le 3 décembre 2021 à l’IMEC.
Il s’agit de présenter les enjeux et problématiques du Notebook, pris comme un objet complexe au sein du cycle des données de la recherche.
Le collectif émerge d’un appel à contribution lancé dans le cadre des Rencontres Huma-Num 2021 par le HN Lab sur la question de l’écriture exécutable, réinterprétée au sein du collectif comme problématique associée au literate programming.
Depuis fin 2022, le collectif anime des webinaires autour de la thématique des notebooks dans une perspective interdisciplinaire. À l’automne 2024, il propose les premières journées du gt notebook.
Dissipative Macroscopic Quantum Tunneling in Type-I Superconductors
Creators: name: Zarzuela, R.
name: Chudnovsky, E. M.
name: Tejada, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study macroscopic quantum tunneling of interfaces separating normal and superconducting regions in type-I superconductors. Mathematical model is developed, that describes dissipative quantum escape of a two-dimensional manifold from a planar potential well. It corresponds to, e.g., a current-driven quantum depinning of the interface from a grain boundary or from artificially manufactured pinning layer. Effective action is derived and instantons of the equations of motion are investigated. Crossover between thermal activation and quantum tunneling is studied and the crossover temperature is computed. Our results, together with recent observation of non-thermal low-temperature magnetic relaxation in lead, suggest possibility of a controlled measurement of quantum depinning of the interface in a type-I superconductor.
description: 6 pages, 2 figures
Graphs embedded into finite projective planes
Creators: name: Mellinger, Keith
name: Vaughn, Ryan
name: Vega, Oscar
Publisher: name: Faculty of Science, University of Calgary
Year: 2015
Subjects: Graph embeddings; finite projective plane; subplane

description: We study embeddings of graphs in finite projective planes, and present related results for some families of graphs including complete graphs and complete bipartite graphs. We also make connections between embeddings of graphs and the existence of certain substructures in a plane, such as Baer subplanes and arcs.
description: Contributions to Discrete Mathematics, Vol 10, No 1 (2015)
Magnetoresistance of 2D and 3D Electron Gas in LaAlO3/SrTiO3 Heterostructures: Influence of Magnetic Ordering, Interface Scattering and Dimensionality
Creators: name: Wang, X.
name: Lü, W. M
name: Annadi, A.
name: Liu, Z. Q.
name: Dhar, S.
name: Venkatesan, T.
name: Ariando
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetoresistance (MR) anisotropy in LaAlO3/SrTiO3 (LAO/STO) interfaces is compared between samples prepared in high oxygen partial pressure (PO2) of 10-4 mbar exhibiting quasi-two-dimensional (quasi-2D) electron gas and low PO2 of 10-6 mbar exhibiting 3D conductivity. While MR of an order of magnitude larger was observed in low PO2 samples compared to those of high PO2 samples, large MR anisotropies were observed in both cases. The MR with the out-of-plane field is always larger compared to the MR with in-plane field suggesting lower dissipation of electrons from interface versus defect scattering. The quasi-2D interfaces show a negative MR at low temperatures while the 3D interfaces show positive MR for all temperatures. Furthermore, the angle relationship of MR anisotropy for these two different cases and temperature dependence of in-plane MR are also presented. Our study demonstrates that MR can be used to distinguish the dimensionality of the charge transport and various (defect, magnetic center, and interface boundary) scattering processes in this system.
description: 14 pages, 5 figures
L'universo inevitabile: perché l'esistenza accade nella coscienza
Creators: name: Prosperi, Giovanni
Publisher: name: Zenodo
Year: 2025

description: Perché esiste qualcosa invece che nulla?

Questa antica domanda ossessiona la filosofia da secoli. In questo saggio rigoroso e radicale, Giovanni Prosperi presenta una nuova struttura metafisica: non una teoria, ma un’architettura logica.

Partendo dall’impossibilità del nulla assoluto, Prosperi sviluppa una visione dell’essere come necessario, auto-generato e attualizzato attraverso l’osservazione coerente. La coscienza non è un sottoprodotto della materia né un incidente biologico: è l’atto strutturale con cui l’universo diventa reale.

Unendo metafisica, logica e teoria quantistica, L’universo inevitabile propone che la realtà non sia “là fuori”, ma collassi nella forma attraverso l’osservazione cosciente. L’essere non è una cosa, ma un processo. L’osservazione non è passiva, ma creativa. L’universo non accade: si osserva.

Un viaggio poetico e filosofico nelle fondamenta stesse della realtà, rivolto a filosofi, scienziati e a chiunque voglia seguire il pensiero razionale fino alle sue conseguenze più audaci.
UCAC3 Proper Motion Survey. II. Discovery Of New Proper Motion Stars In UCAC3 With 0.40" yr^-1 > mu >= 0.18" yr^-1 Between Declinations -47 deg and 00 deg
Creators: name: Finch, C. T.
name: Zacharias, N.
name: Boyd, M. R.
name: Henry, T. J.
name: Hambly, N. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present 474 new proper motion stellar systems in the southern sky having no previously known components, with 0.40" yr^-1 > mu >= 0.18" yr^-1 between declinations -47 deg and 00 deg. In this second paper utilizing the U.S. Naval Observatory third CCD Astrograph Catalog (UCAC3) we complete our sweep of the southern sky for objects in the proper motion range targeted by this survey with R magnitudes ranging from 9.80 to 19.61. The new systems contribute a ~16% increase in the number of new stellar systems for the same region of sky reported in previous SuperCOSMOS RECONS (SCR) surveys. Among the newly discovered stellar systems are 16 multiples, plus an additional 10 components that are new common proper motion companions to previously known objects. A comparison of UCAC3 proper motions to those from Hipparcos, Tycho-2, Southern Proper Motion (SPM4), and SuperCOSMOS indicates that all proper motions are consistent to ~10 mas/yr, with the exception of SuperCOSMOS. Distance estimates are derived for all stellar systems having SuperCOSMOS Sky Survey (SSS) B_J, R_59F, and I_IVN plate magnitudes and Two-Micron All Sky Survey (2MASS) infrared photometry. We find five new red dwarf systems estimated to be within 25 pc. These discoveries support results from previous proper motion surveys suggesting that more nearby stellar systems are to be found, particularly in the fainter, slower moving samples. In this second paper utilizing the U.S. Naval Observatory third CCD Astrograph Catalog (UCAC3) we complete our sweep of the southern sky for objects in the proper motion range targeted by this survey with R magnitudes ranging from 9.80 to 19.61.
description: 24 pages, 7 figures and 4 tables. Accepted for publication in ApJ
Who's Hosting the Block Party? Studying Third-Party Blockage of CSP and SRI
Creators: name: Steffens, Marius
name: Musch, Marius
name: Johns, Martin
name: Stock, Ben
Publisher: name: CISPA
Year: 2023

description: The Web has grown into the most widely used application platform for our daily lives. First-party Web applications thrive due to many different third parties they rely on to provide auxiliary functionality, like maps or ads, to their sites. In this paper, we set out to understand to what extent this outsourcing has adverse effects on two key security mechanisms, namely Content Security Policy (CSP; to mitigate XSS) and Subresource Integrity (SRI; to mitigate third-party compromises) by conducting a longitudinal study over 12 weeks on 10,000 top sites. Under the assumption that a first party wants to deploy CSP and SRI and is able to make their code base compliant with these mechanisms, we assess how many sites could fully deploy the mechanisms without cooperation from their third parties. For those unable to do so without cooperation, we also measure how many third parties would jointly have to make their code compliant to enable first-party usage of CSP and SRI. To more accurately depict trust relations, we rely on holistic views into inclusion chains within all pages of the investigated sites. In addition, based on a combination of heuristics and manual validation, we identify different eTLD+1s belonging to the same business entity, allowing us to more accurately discerning parties from each other. Doing so, we show that the vast majority of sites includes third-party code which necessitates the use of unsafe-inline (75%) or unsafe-eval (61%), or makes deployment of strict-dynamic impossible (76%) without breakage of functionality. For SRI, based on the analysis of a single snapshot (within less than 12 hours), we also show that more than half of all sites cannot fully rely on SRI to protect them from third-party compromise due to randomized third-party content.
title: Spherical polyelectrolyte nanogels as templates to prepare hollow silica nanocarriers: observation by small angle X-ray scattering and TEM
Creators: name: Han, Haoya
name: Li, Li
name: Tian, Yuchuan
name: Wang, Yunwei
name: Ye, Zhishuang
name: Yang, Qingsong
name: Wang, Yiming
name: Klitzing, Regine von
name: Guo, Xuhong
Publisher: name: Royal Society of Chemistry
Year: 2021

description: Hollow silica nanoparticles were prepared through generating a silica layer in spherical polyelectrolyte nanogels (SPN), which consisted of a solid core of polystyrene (PS) and a shell of crosslinked poly(acrylic acid) (PAA), followed by removing the PS core via solvent dissolution. Small angle X-ray scattering (SAXS) in combination with TEM were employed to observe SPN, silica–polymer composite, and hollow silica nanoparticles. It was confirmed that SAXS is a powerful method to monitor the generation of silica layer in SPN. The density and thickness of generated silica layer in SPN were found to be tunable by controlling the crosslinking density of the templates. The porous structure and pH sensitivity of silica layer allowed the obtained hollow silica to be ideal carriers for controlled drug delivery.
Evolution of the far-infrared luminosity functions in the Spitzer Wide-area Infrared Extragalactic Legacy Survey
Creators: name: Patel, H.
name: Clements, D. L.
name: Vaccari, M.
name: Mortlock, D. J.
name: Rowan-Robinson, M.
name: Perez-Fournon, I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present new observational determination of the evolution of the rest-frame 70 and 160 micron and total infrared (TIR) galaxy luminosity functions (LFs) using 70 micron data from the Spitzer Wide-area Infrared Extragalactic Legacy Survey (SWIRE). The LFs were constructed for sources with spectroscopic redshifts only in the XMM-LSS and Lockman Hole fields from the SWIRE photometric redshift catalogue. The 70 micron and TIR LFs were constructed in the redshift range 0
description: 17 pages, 14 figures
Efficient extraction of ontologies from domain specific text corpora
Creators: name: Li, Tianyu
Publisher: name: University of British Columbia
Year: 2011

description: There is a huge body of domain-specific knowledge embedded in free-text repositories such as engineering documents, instruction manuals, medical references and legal files. Extracting ontological relationships (e.g., ISA and HASA) from this kind of corpus can improve users’ queries and improve navigation through the corpus, as well as benefiting applications built for these domains. Current methods to extract ontological relationships from text data usually fail to capture many meaningful relationships because they concentrate on single-word-terms or very short phrases. This is particularly problematic in a smaller corpus, where it is harder to find statistically meaningful relationships. We propose a novel pattern-based algorithm that finds ontological relationships between complex concepts by exploiting parsing information to extract concepts consisting of multi-word and nested phrases. Our procedure is iterative: we tailor the constrained sequential pattern mining framework to discover new patterns. We compare our algorithm with previous representative ontology extraction algorithms on four real data sets and achieve consistently and significantly better results.
On the chromatic index of Latin squares
Creators: name: Cavenagh, Nicholas
name: Kuhl, Jaromy
Publisher: name: Faculty of Science, University of Calgary
Year: 2016

description: A proper coloring of a Latin square of order n is an assignment of colors to its elements triples such that each row, column and symbol is assigned n distinct colors. Equivalently, a proper coloring of a Latin square is a partition into partial transversals. The chromatic index of a Latin square is the least number of colors needed for a proper coloring. We study the chromatic index of the cyclic Latin square which arises from the addition table for the integers modulo n. We obtain the best possible bounds except for the case when n/2 is odd and divisible by 3. We make some conjectures about the chromatic index, suggesting a generalization of Ryser’s conjecture (that every Latin square of odd order contains a transversal).
description: Contributions to Discrete Mathematics, Vol 10, No 2 (2015)
Bunching and anti-bunching in electronic transport
Creators: name: Emary, Clive
name: Pöltl, Christina
name: Carmele, Alexander
name: Kabuss, Julia
name: Knorr, Andreas
name: Brandes, Tobias
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In quantum optics the $g^{(2)}$-function is a standard tool to investigate photon emission statistics. We define a $g^{(2)}$-function for electronic transport and use it to investigate the bunching and anti-bunching of electron currents. Importantly, we show that super-Poissonian electron statistics do not necessarily imply electron bunching, and that sub-Poissonian statistics do not imply anti-bunching. We discuss the information contained in $g^{(2)}(τ)$ for several typical examples of transport through nano-structures such as few-level quantum dots.
description: 8 pages, 5 figures