cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
How to Center Binary Deep Boltzmann Machines
Creators: name: Melchior, Jan
name: Fischer, Asja
name: Wiskott, Laurenz
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This work analyzes centered binary Restricted Boltzmann Machines (RBMs) and binary Deep Boltzmann Machines (DBMs), where centering is done by subtracting offset values from visible and hidden variables. We show analytically that (i) centering results in a different but equivalent parameterization for artificial neural networks in general, (ii) the expected performance of centered binary RBMs/DBMs is invariant under simultaneous flip of data and offsets, for any offset value in the range of zero to one, (iii) centering can be reformulated as a different update rule for normal binary RBMs/DBMs, and (iv) using the enhanced gradient is equivalent to setting the offset values to the average over model and data mean. Furthermore, numerical simulations suggest that (i) optimal generative performance is achieved by subtracting mean values from visible as well as hidden variables, (ii) centered RBMs/DBMs reach significantly higher log-likelihood values than normal binary RBMs/DBMs, (iii) centering variants whose offsets depend on the model mean, like the enhanced gradient, suffer from severe divergence problems, (iv) learning is stabilized if an exponentially moving average over the batch means is used for the offset values instead of the current batch mean, which also prevents the enhanced gradient from diverging, (v) centered RBMs/DBMs reach higher LL values than normal RBMs/DBMs while having a smaller norm of the weight matrix, (vi) centering leads to an update direction that is closer to the natural gradient and that the natural gradient is extremly efficient for training RBMs, (vii) centering dispense the need for greedy layer-wise pre-training of DBMs, (viii) furthermore we show that pre-training often even worsen the results independently whether centering is used or not, and (ix) centering is also beneficial for auto encoders.
description: Author list in meta data corrected - 57 pages, 17 figures, 13 tables
Upgrade of the RBI-AF infrastructure for detector characterisation, SEE, micro hardness testing
Creators: name: I. Božičević Mihalić
name: D. D. Cosic
name: S. Fazinic
name: M. Jakšić
name: G. Provatas
name: M. Vićentijević
Publisher: name: Zenodo
Year: 2023
Subjects: WP4

description: This document is related to the implementation of Task 4.2 ‘Micro-beam upgrade at RBI Accelerator
 Facility’. The aim is to upgrade the two existing ion micro-beam stations by providing a precise
 motorized positioning system with the beam current control and device under control position
 monitor, as well as to demonstrate the sample cooling option for the ‘old’ micro-beam station. It has
 been planned that up to M23 ‘new’ ion micro-beam station will be upgraded (MS12) and that the
 ‘old’ micro-beam station will be upgraded in the same way before the project end.
Optimization of external stimuli for populations of theta neurons via mean-field feedback control
Creators: name: Chertovskih, Roman
name: Pogodaev, Nikolay
name: Staritsyn, Maxim
name: Sewane, Joaquim Da Silva
name: Aguiar, Antonio Pedro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We study a problem of designing ``robust'' external excitations for control and synchronization of an assembly of homotypic harmonic oscillators representing so-called theta neurons. The model of theta neurons (Theta model) captures, in main, the bursting behavior of spiking cells in the brain of biological beings, enduring periodic oscillations of the electric potential in their membrane.
 We study the following optimization problem: to design an external stimulus (control), which steers all neurons of a given population to their desired phases (i.e., excites/slows down its spiking activity) with the highest probability.
 This task is formulated as an optimal mean-field control problem for the local continuity equation in the space of probability measures. To solve this problem numerically, we propose an indirect deterministic descent method based on an exact representation of the increment (infinite-order variation) of the objective functional. We discuss some aspects of practical realization of the proposed method, and provide results of numerical experiments.
D6.3 Public engagement strategy to design DECISION along with the need of patients
Creators: name: Rabal, Gemma
name: De Lecuona, Itziar
Publisher: name: Zenodo
Year: 2020
Subjects: ACLF
cirrhosis

description: The goal of this policy is to provide a framework of public engagement in research in DECISION to align this project with the Responsible Research and Innovation (RRI) framework. The first part develops public engagement as a tool to involve any of the possible stakeholders, whether they are patients, general public, policy makers or business and industry. It develops the RRI initiative in the context of Horizon2020 and provides practical tools and resources to help in its implementation. The second part narrows down the public engagement strategy to include patients as the key stakeholder in the clinical trial. It covers benefits and challenges of patient inclusion in research and evidence of the areas that benefit from a patient approach, as well as references for resources and best practices. The third part is an analysis of the DECISION project regarding the role of patients, what is already being done and areas that can benefit from a deeper inclusion of patient voices. Finally, the fourth part sums up the recommendations provided in this document regarding each of the areas analysed.
Bounding first-order quantum phase transitions in adiabatic quantum computing
Creators: name: Werner, Matthias
name: García-Sáez, Artur
name: Estarellas, Marta P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the context of adiabatic quantum computation (AQC), it has been argued that first-order quantum phase transitions (QPTs) due to localisation phenomena cause AQC to fail by exponentially decreasing the minimal spectral gap of the Hamiltonian along the annealing path as a function of the qubit number. The vanishing of the spectral gap is often linked to the localisation of the ground state in a local minimum, requiring the system to tunnel into the global minimum at a later stage of the annealing. Recent methods have been proposed to avoid this phenomenon by carefully designing the involved Hamiltonians. However, it remains a challenge to formulate a comprehensive theory of the effect of the various parameters and the conditions under which QPTs make the AQC algorithm fail. Equipped with concepts from graph theory, in this work we link graph quantities associated to the Hamiltonians along the annealing path with the occurrence of QPTs. These links allow us to derive bounds on the location of the minimal spectral gap along the annealing path, augmenting the toolbox for the analysis of strategies to improve the runtime of AQC algorithms.
description: 14 pages, 7 figures
Microlensed image centroid motions by an exotic lens object with negative convergence or negative mass
Creators: name: Kitamura, Takao
name: Izumi, Koji
name: Nakajima, Koki
name: Hagiwara, Chisaki
name: Asada, Hideki
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational lens models with negative convergence inspired by modified gravity theories, exotic matter and energy have been recently examined, in such a way that a static and spherically symmetric modified spacetime metric depends on the inverse distance to the $n$-th power ($n=1$ for Schwarzschild metric, $n=2$ for Ellis wormhole, and $n \neq 1$ for an extended spherical distribution of matter such as an isothermal sphere) in the weak-field approximation [Kitamura, Nakajima and Asada, PRD 87, 027501 (2013), Izumi et al. PRD 88 024049 (2013)]. Some of the models act as if a convex lens, whereas the others are repulsive on light rays like a concave lens. The present paper considers microlensed image centroid motions by the exotic lens models. Numerical calculations show that, for large $n$ cases in the convex-type models, the centroid shift from the source position might move on a multiply-connected curve like a bow tie, while it is known to move on an ellipse for $n=1$ case and to move on an oval curve for $n=2$. The distinctive feature of the microlensed image centroid may be used for searching (or constraining) localized exotic matter or energy with astrometric observations. It is shown also that the centroid shift trajectory for concave-type repulsive models might be elongated vertically to the source motion direction like a prolate spheroid, whereas that for convex-type models such as the Schwarzschild one is tangentially elongated like an oblate spheroid.
description: 22 pages, 8 figures, 3 tables. accepted by PRD. arXiv admin note: substantial text overlap with arXiv:1305.5037
Decompositions and Terracini loci of cubic forms of low rank
Creators: name: Chiantini, Luca
name: Gesmundo, Fulvio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N07, 14N05, 15A69

description: We study Waring rank decompositions for cubic forms of rank $n+2$ in $n+1$ variables. In this setting, we prove that if a concise form has more than one non-redundant decomposition of length $n+2$, then all such decompositions share at least $n-3$ elements, and the remaining elements lie in a special configuration. Following this result, we give a detailed description of the $(n+2)$-th Terracini locus of the third Veronese embedding of $n$-dimensional projective space.
description: 15 pages. Final version
Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits
Creators: name: Koshino, Kazuki
name: Inomata, Kunihiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The number of superconducting qubits contained in a single quantum processor is increasing steadily. However, to realize a truly useful quantum computer, it is inevitable to increase the number of qubits much further by distributing quantum information among distant processors using flying qubits. Here, we demonstrate a key element towards this goal, namely, a SWAP gate between the superconducting-atom and microwave-photon qubits. The working principle of this gate is the single-photon Raman interaction, which results from strong interference in one-dimensional optical systems and enables a high gate fidelity insensitively to the pulse shape of the photon qubit, by simply bouncing the photon qubit at a cavity attached to the atom qubit. We confirm the bidirectional quantum state transfer between the atom and photon qubits. The averaged fidelity of the photon-to-atom (atom-to-photon) state transfer reaches 0.829 (0.801), limited mainly by the energy relaxation time of the atom qubit. The present atom-photon gate, equipped with an in situ tunability of the gate type, would enable various applications in distributed quantum computation using superconducting qubits and microwave photons.
description: 14 pages, 5 figures
Half-turn linked pairs of isometries of hyperbolic 4-space
Creators: name: Silverio, Andrew E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Metric Geometry (math.MG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 51M10 (Primary), 30F40 (Secondary)

description: In this paper we develop a complete theory of factorization for isometries of hyperbolic 4-space. Of special interest is the case where a pair of isometries is linked, that is, when a pair of isometries can be expressed each as compositions of two involutions, one of which is common to both isometries. Here we develop a new theory of hyperbolic pencils and twisting planes involving a new geometric construction, their half-turn banks. This enables us to give complete results about each of the pair-types of isometries and their simultaneous factorization by half-turns. That is, we provide geometric conditions for each such pair to be linked by half-turns. The main result gives a necessary and sufficient condition for any given pair of isometries to be linked. We also provide a procedure for constructing a half-turn linked pair of isometries of $\mathbb{H}^4$ that do not restrict to lower dimensions, yielding an example that gives a negative answer to a question raised by Ara Basmajian and Karan Puri.
A probabilistic approach to Lorentz balls
Creators: name: Kabluchko, Zakhar
name: Prochno, Joscha
name: Sonnleitner, Mathias
Publisher: name: arXiv
Year: 2023
Subjects: subject: Functional Analysis (math.FA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: Primary 46B09, 52A23, 60F05, Secondary 46B06, 46B20, 46B45, 94A17

description: We develop a probabilistic approach to study the volumetric and geometric properties of unit balls $\mathbb B_{q,1}^n$ of finite-dimensional Lorentz sequences spaces $\ell_{q,1}^n$. More precisely, we show that the empirical distribution of a random vector $X^{(n)}$ uniformly distributed on the volume normalized Lorentz ball in $\mathbb R^n$ converges weakly to a compactly supported symmetric probability distribution with explicitly given density; as a consequence we obtain a weak Poincaré-Maxwell-Borel principle for any fixed number $k\in\mathbb N$ of coordinates of $X^{(n)}$ as $n\to\infty$. Moreover, we prove a central limit theorem for the largest coordinate of $X^{(n)}$, demonstrating a quite different behavior than in the case of the $\ell_q^n$ balls, where a Gumbel distribution appears in the limit. Last but not least, we prove a Schechtman-Schmuckenschläger type result for the asymptotic volume of intersections of volume normalized Lorentz and $\ell^n_p$ balls.
description: 27 pages, 1 figure
Study of Hadrons Using the Gaussian Functional Method in the O(4) Linear $σ$ Model
Creators: name: Chen, Hua-Xing
name: Imai, Shotaro
name: Toki, Hiroshi
name: Geng, Li-Sheng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study properties of hadrons in the O(4) linear $σ$ model, where we take into account fluctuations of mesons around their mean field values using the Gaussian functional (GF) method. In the GF method we calculate dressed $σ$ and $π$ masses, where we include the effect of fluctuations of mesons to find a better ground state wave function than the mean field approximation. Then we solve the Bethe-Salpeter equations and calculate physical $σ$ and $π$ masses. We recover the Nambu-Goldstone theorem for the physical pion mass to be zero in the chiral limit. The $σ$ meson is a strongly correlated meson-meson state, and has a 4 quark structure. We calculate $σ$ and $π$ masses as functions of temperature for the two cases of chiral limit and explicit chiral symmetry breaking. We get similar behaviors for the $σ$ and $π$ masses as the case of the mean field approximation, but the coupling constants are much larger than the values of the case of the mean field approximation.
description: 14 pages, 18 figures, submitted to Chinese Physics C
What is a degree of freedom? Configuration spaces and their topology
Creators: name: Margalef-Bentabol, Juan
name: Herman, Leigh
name: Booth, Ivan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Classical Physics (physics.class-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70, 97, 54

description: Understanding degrees of freedom in classical mechanics is fundamental to characterizing physical systems. Counting them is usually easy, especially if we can assign them a clear meaning. However, the precise definition of a degree of freedom is not usually presented in first-year physics courses since it requires mathematical knowledge only learned in more advanced courses. In this paper, we use a pedagogical approach motivated by simple but non-trivial mechanical examples to define degrees of freedom and configuration spaces. We highlight the role that topology plays in understanding these ideas.
Deep Single Image Camera Calibration by Heatmap Regression to Recover Fisheye Images Under Manhattan World Assumption
Creators: name: Wakai, Nobuhiko
name: Sato, Satoshi
name: Ishii, Yasunori
name: Yamashita, Takayoshi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: A Manhattan world lying along cuboid buildings is useful for camera angle estimation. However, accurate and robust angle estimation from fisheye images in the Manhattan world has remained an open challenge because general scene images tend to lack constraints such as lines, arcs, and vanishing points. To achieve higher accuracy and robustness, we propose a learning-based calibration method that uses heatmap regression, which is similar to pose estimation using keypoints, to detect the directions of labeled image coordinates. Simultaneously, our two estimators recover the rotation and remove fisheye distortion by remapping from a general scene image. Without considering vanishing-point constraints, we find that additional points for learning-based methods can be defined. To compensate for the lack of vanishing points in images, we introduce auxiliary diagonal points that have the optimal 3D arrangement of spatial uniformity. Extensive experiments demonstrated that our method outperforms conventional methods on large-scale datasets and with off-the-shelf cameras.
description: Accepted by CVPR2024
Simulation of sharp interface multi-material flows involving an arbitrary number of components through an extended five-equation model
Creators: name: Friess, Marie Billaud
name: Kokh, Samuel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper, we present an anti-diffusive method dedicated to the simulation of interface flows on Cartesian grids involving an arbitrary number m of compress- ible components. Our work is two folds. First, we introduce a m-component flow model that generalizes a classic two material five-equation model. In that way, interfaces are localized thanks to color function discontinuities and a pres- sure equilibrium closure law is used to complete this new model. The resulting model is demonstrated to be hyperbolic under simple assumptions and consis- tent. Second, we present a discretization strategy for this model relying on an Lagrange-Remap scheme. Here, the projection step involves an anti-dissipative mechanism allowing to prevent numerical diffusion of the material interfaces. The proposed solver is built ensuring in one hand consistency and stability properties and in other hand that the sum of the color functions remains equal to one. The resulting scheme is first order accurate and conservative for the mass, momentum, energy and partial masses. Furthermore, the obtained dis- cretization preserves Riemann invariants as pressure and velocity at the inter- faces. Finally, validation computations of this numerical method are performed on several tests in one and two dimensions. The accuracy of the method is also compared to results obtained by the upwind Lagrange-Remap scheme.
title: Personalia
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 12, Nr. 1 (1983), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Deep AutoRegressive Networks
Creators: name: Gregor, Karol
name: Danihelka, Ivo
name: Mnih, Andriy
name: Blundell, Charles
name: Wierstra, Daan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We introduce a deep, generative autoencoder capable of learning hierarchies of distributed representations from data. Successive deep stochastic hidden layers are equipped with autoregressive connections, which enable the model to be sampled from quickly and exactly via ancestral sampling. We derive an efficient approximate parameter estimation method based on the minimum description length (MDL) principle, which can be seen as maximising a variational lower bound on the log-likelihood, with a feedforward neural network implementing approximate inference. We demonstrate state-of-the-art generative performance on a number of classic data sets: several UCI data sets, MNIST and Atari 2600 games.
description: Appears in Proceedings of the 31st International Conference on Machine Learning (ICML), Beijing, China, 2014
Visualising Personal Data Flows: Insights from a Case Study of Booking.com
Creators: name: Yuan, Haiyue
name: Boakes, Matthew
name: Ma, Xiao
name: Cao, Dongmei
name: Li, Shujun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Commercial organisations are holding and processing an ever-increasing amount of personal data. Policies and laws are continually changing to require these companies to be more transparent regarding the collection, storage, processing and sharing of this data. This paper reports our work of taking Booking.com as a case study to visualise personal data flows extracted from their privacy policy. By showcasing how the company shares its consumers' personal data, we raise questions and extend discussions on the challenges and limitations of using privacy policies to inform online users about the true scale and the landscape of personal data flows. This case study can inform us about future research on more data flow-oriented privacy policy analysis and on the construction of a more comprehensive ontology on personal data flows in complicated business ecosystems.
description: This is the full edition of a paper published in Intelligent Information Systems: CAiSE Forum 2023, Zaragoza, Spain, June 12-16, 2023, Proceedings, Lecture Notes in Business Information Processing (LNBIP), Volume 477, pp. 52-60, 2023, Springer Nature, https://link.springer.com/book/10.1007/978-3-031-34674-3_7
The signature of positive braids is linearly bounded by their first Betti number
Creators: name: Feller, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27

description: We provide linear lower bounds for the signature of positive braids in terms of the three genus of their braid closure. This yields linear bounds for the topological slice genus of knots that arise as closures of positive braids.
description: 14 pages, 2 figures. Version 2: Change of sign convention for the signature of links, minor corrections, implementation of referee's recommendations
title: Zum Thema
Creators: name: Gebeßler, August
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 12, Nr. 2 (1983), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Effect of Spatial Interference Correlation on the Performance of Maximum Ratio Combining
Creators: name: Tanbourgi, Ralph
name: Dhillon, Harpreet S.
name: Andrews, Jeffrey G.
name: Jondral, Friedrich K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Networking and Internet Architecture (cs.NI)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: While the performance of maximum ratio combining (MRC) is well understood for a single isolated link, the same is not true in the presence of interference, which is typically correlated across antennas due to the common locations of interferers. For tractability, prior work focuses on the two extreme cases where the interference power across antennas is either assumed to be fully correlated or fully uncorrelated. In this paper, we address this shortcoming and characterize the performance of MRC in the presence of spatially-correlated interference across antennas. Modeling the interference field as a Poisson point process, we derive the exact distribution of the signal-to-interference ratio (SIR) for the case of two receive antennas, and upper and lower bounds for the general case. Using these results, we study the diversity behavior of MRC and characterize the critical density of simultaneous transmissions for a given outage constraint. The exact SIR distribution is also useful in benchmarking simpler correlation models. We show that the full-correlation assumption is considerably pessimistic (up to 30% higher outage probability for typical values) and the no-correlation assumption is significantly optimistic compared to the true performance.
description: to appear in IEEE Transactions on Wireless Communications
title: Die Dienststellen des Landesdenkmalamtes
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 13, Nr. 1 (1984), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Integrated perturbation theory for cosmological tensor fields. III. Projection effects
Creators: name: Matsubara, Takahiko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The integrated perturbation theory (iPT) is a set of methods in nonlinear perturbation theory for the structure formation in the Universe. In Papers I and II [arXiv:2210.10435, arXiv:2210.11085], the basic formalism and technical methods of the iPT for cosmological tensor fields are developed, generalizing the corresponding theory for scalar fields. In previous papers, methods to predict statistical quantities, such as power spectra, correlation functions, etc., of three-dimensional tensor fields are developed based on the iPT. However, observations of tensors, such as angular momenta and shapes of galaxies, etc., are only possible after the three-dimensional tensors are projected onto the two-dimensional sky. In this paper, power spectra and correlation functions of projected two-dimensional tensors are related to those of original three-dimensional tensors, so that one can make predictions for the observable statistics of projected tensor fields from the iPT. The relations are consistently represented on the basis of irreducible decomposition of both two- and three-dimensional tensors.
description: 30 pages, no figure, this paper is the third of a series, the first one is arXiv:2210.10435, the second one is arXiv:2210.11085 and the fourth one is arXiv:2405.09038
Influence of a Minimal Length on the Creation of Scalar Particles
Creators: name: Haouat, S.
name: Nouicer, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we have studied the problem of scalar particles pair creation by an electric field in the presence of a minimal length. Two sets of exact solutions for the Klein Gordon equation are given in momentum space. Then the canonical method based on Bogoliubov transformation connecting the "in" with the "out" states is applied to calculate the probability to create a pair of particles and the mean number of created particles. The number of created particles per unit of time per unit of length, which is related directly to the experimental measurements, is calculated. It is shown that, with an electric field less than the critical value, the minimal length minimizes the particle creation. It is shown, also, that the limit of zero minimal length reproduces the known results corresponding to the ordinary quantum fields.
description: significant improvement, 24 pages, 1 figure, Accepted for publication in prd
Flat limit of massless scalar scattering in $\mathrm{AdS}_2$
Creators: name: Duary, Sarthak
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore the flat limit of massless scalar scattering in $\mathrm{AdS}_2$. We derive the $1 \to 1$ $\mathcal{S}$-matrix from the CFT $2$-point function. We show a key property of the $2 \to 2$ $\mathcal{S}$-matrix in $2d$, where the contact interaction in the flat limit gives momentum conserving delta function. We show the factorization of the $n \to n$ $\mathcal{S}$-matrix for integrable models in the flat limit, focusing on contact interactions. We calculate the $\mathcal{S}$-matrix by linking the CFT operator on the AdS boundary to the scattering state in flat-space. We use bulk operator reconstruction to study massless scalar scattering in the flat limit and solve the Klein-Gordon equation in global $\mathrm{AdS}_2$ for the massless scalar field. The solution is simple, involving a pure phase in global time and a sinusoidal function in the radial coordinate. This simplicity also extends to the smearing function, allowing us to map the scattering state to the CFT operator while taking AdS corrections into account.
description: 31 pages, 2 figures; minor improvements, typos corrected; matches journal version, to appear in Nuclear Physics B (High Energy Physics - Theory)
Dissipative time crystal in a strongly interacting Rydberg gas
Creators: name: Wu, Xiaoling
name: Wang, Zhuqing
name: Yang, Fan
name: Gao, Ruochen
name: Liang, Chao
name: Tey, Meng Khoon
name: Li, Xiangliang
name: Pohl, Thomas
name: You, Li
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The notion of spontaneous symmetry breaking has been well established to characterize classical and quantum phase transitions of matter, such as in condensation, crystallization or quantum magnetism. Generalizations of this paradigm to the time dimension can lead to a time crystal phase, which spontaneously breaks the time translation symmetry of the system. Whereas the existence of a continuous time crystal at equilibrium has been challenged by no-go theorems, this difficulty can be circumvented by dissipation in an open system. Here, we report the experimental observation of such dissipative time crystalline order in a room-temperature atomic gas, where ground-state atoms are continuously driven to Rydberg states. The emergent time crystal is revealed by persistent oscillations of the photon transmission, and we show that the observed limit cycles arise from the coexistence and competition between distinct Rydberg components. The nondecaying autocorrelation of the oscillation, together with the robustness against temporal noises, indicate the establishment of true long-range temporal order and demonstrates the realization of a continuous time crystal.
description: 14 pages, 4+6 figures
The Alexander polynomial as an intersection of two cycles in a symmetric power
Creators: name: Kalinin, Nikita
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We consider a braid $β$ which acts on a punctured plane. Then we construct a local system on this plane and find a homology cicle $D$ in its symmetric power such that $D\cdot β(D)$ coincides with the Alexander polynomial of the plate closure of $β$.
description: revision, the text is rearranged, details are added
title: Die feste Stadt. Anmerkungen zu Funktion und Bedeutung der mittelalterlichen Stadtbefestigung und ihrer denkmalpflegerischen Bewertung. Mit einem aktuellen Beispiel: Durlach
Creators: name: Seidenspinner, Wolfgang
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 13, Nr. 2 (1984), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Primordial spectra from sudden turning trajectory
Creators: name: Noumi, Toshifumi
name: Yamaguchi, Masahide
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory. When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations. In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately. We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn. Though both effects can induce parametric resonance amplifications, they are shown to be canceled out for the case with the canonical kinetic terms. The peak feature and the scale dependence of bispectra are also discussed.
description: 58 pages, 22 figures; v2: minor revision, published version
The Core & Periphery Hypothesis: A Conceptual Basis for Generality in Cell and Developmental Biology
Creators: name: Gallo, Elisa
name: De Renzis, Stefano
name: Sharpe, James
name: Mayor, Roberto
name: Hartmann, Jonas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Populations and Evolution (q-bio.PE)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: The discovery of general principles underlying the complexity and diversity of cellular and developmental systems is a central and long-standing aim of biology. Whilst new technologies collect data at an ever-accelerating rate, there is growing concern that conceptual progress is not keeping pace. We contend that this is due to a paucity of appropriate conceptual frameworks to serve as a basis for general theories of mesoscale biological phenomena. In exploring this issue, we have developed a foundation for one such framework, termed the Core and Periphery (C&P) hypothesis, which reveals hidden generality across the diverse and complex behaviors exhibited by cells and tissues. Here, we present the C&P concept, provide examples of its applicability across multiple scales, argue its consistency with evolution, and discuss key implications and open questions. We propose that the C&P hypothesis could unlock new avenues of conceptual progress in cell and developmental biology.
description: 35 pages, 5 figures
title: Neuerscheinung
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 13, Nr. 2 (1984), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Practical Matrix Completion and Corruption Recovery using Proximal Alternating Robust Subspace Minimization
Creators: name: Wang, Yu-Xiang
name: Lee, Choon Meng
name: Cheong, Loong-Fah
name: Toh, Kim-Chuan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Low-rank matrix completion is a problem of immense practical importance. Recent works on the subject often use nuclear norm as a convex surrogate of the rank function. Despite its solid theoretical foundation, the convex version of the problem often fails to work satisfactorily in real-life applications. Real data often suffer from very few observations, with support not meeting the random requirements, ubiquitous presence of noise and potentially gross corruptions, sometimes with these simultaneously occurring. This paper proposes a Proximal Alternating Robust Subspace Minimization (PARSuMi) method to tackle the three problems. The proximal alternating scheme explicitly exploits the rank constraint on the completed matrix and uses the $\ell_0$ pseudo-norm directly in the corruption recovery step. We show that the proposed method for the non-convex and non-smooth model converges to a stationary point. Although it is not guaranteed to find the global optimal solution, in practice we find that our algorithm can typically arrive at a good local minimizer when it is supplied with a reasonably good starting point based on convex optimization. Extensive experiments with challenging synthetic and real data demonstrate that our algorithm succeeds in a much larger range of practical problems where convex optimization fails, and it also outperforms various state-of-the-art algorithms.
description: Published at IJCV
Understanding shape entropy through local dense packing
Creators: name: van Anders, Greg
name: Klotsa, Daphne
name: Ahmed, N. Khalid
name: Engel, Michael
name: Glotzer, Sharon C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Entropy drives the phase behavior of colloids ranging from dense suspensions of hard spheres or rods to dilute suspensions of hard spheres and depletants. Entropic ordering of anisotropic shapes into complex crystals, liquid crystals, and even quasicrystals has been demonstrated recently in computer simulations and experiments. The ordering of shapes appears to arise from the emergence of directional entropic forces (DEFs) that align neighboring particles, but these forces have been neither rigorously defined nor quantified in generic systems. Here, we show quantitatively that shape drives the phase behavior of systems of anisotropic particles upon crowding through DEFs. We define DEFs in generic systems, and compute them for several hard particle systems. We show that they are on the order of a few kT at the onset of ordering, placing DEFs on par with traditional depletion, van der Waals, and other intrinsic interactions. In experimental systems with these other interactions, we provide direct quantitative evidence that entropic effects of shape also contribute to self-assembly. We use DEFs to draw a distinction between self-assembly and packing behavior. We show that the mechanism that generates directional entropic forces is the maximization of entropy by optimizing local particle packing. We show that this mechanism occurs in a wide class of systems, and we treat, in a unified way, the entropy-driven phase behavior of arbitrary shapes incorporating the well-known works of Kirkwood, Onsager, and Asakura and Oosawa.
description: v3: 9+10 revtex pages, 10 figures, minor changes, changed title to match journal version
Services Publics+ et éco-responsabilité [Formation CRFCB Média Normandie mai 2023]
Creators: name: Pouilloux, Hélène
name: Smouts, Marie
Publisher: name: Zenodo
Year: 2023
Subjects: Ecoresponsabilité
Label Services Publics +
Bibliothèques
Empreinte environnementale
Responsabilité sociétale
université de Franche-Comté

description:  Formation "Services Publics + et écoresponsabilité" Objectifs Connaître les politiques publiques internationales et nationales en matière d'enjeux environnementaux : agenda 2030, Services Publics +… Définir et articuler éco-responsabilité et Responsabilité Sociétale et Environnementale Identifier les leviers d’actions et les projets à mener pour réduire l'empreinte environnementale d'une bibliothèque Partager retours d’expérience et exemples concrets d’actions écoresponsables en bibliothèque, en interne comme en externe Elaborer des pistes d’actions écoresponsables utilisables dans son propre contexte professionnel Programme  Présentation des enjeux, du cadre institutionnel et de l’implication des bibliothèques dans la transition environnementale actuelle. Diffusion de méthodologie et d’exemples de moyens d’agir en bibliothèque. Mise en commun et élaboration en atelier de projets éco-responsables en bibliothèque. Méthode Apports théoriques et pratiques Brainstorming et atelier participatif
MuPAD codes which implement limit-computable functions that cannot be bounded by any computable function
Creators: name: Tyszka, Apoloniusz
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Complexity (cs.CC)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: 03D25, 11U05, 68Q05

description: For a positive integer n, let f(n) denote the smallest non-negative integer b such that for each system S \subseteq {x_k=1,x_i+x_j=x_k,x_i*x_j=x_k: i,j,k \in {1,...,n}} with a solution in non-negative integers x_1,...,x_n, there exists a solution of S in {0,...,b}^n. We prove that the function f is strictly increasing and dominates all computable functions. We present an infinite loop in MuPAD which takes as input a positive integer n and returns a non-negative integer on each iteration. Let g(n,m) denote the number returned on the m-th iteration, if n is taken as input. Then, g(n,m) \leq m-1, 0=g(n,1)<1=g(n,2) \leq g(n,3) \leq g(n,4) \leq ... and g(n,f(n))N that cannot be bounded by any computable function. This code takes as input a non-negative integer n, immediately returns 0, and computes a system S of polynomial equations. If the loop terminates for S, then the next instruction is executed and returns ξ(n).
description: 16 pages, Theorem 1 strengthened
Project Ô Internal Newsletters
Creators: name: van Zuydam, Lali
name: Martin, Daniela
name: Jensen, Aaron
name: Jensen, Eric
name: Sayles, Lisa
Publisher: name: Zenodo
Year: 2022

description: Four internal newsletters were sent out in 2022 (Spring, Summer, Autumn and Winter editions). Useful resources, such as project videos and images, communication materials (such as bi-fold and tri-fold brochures, and slide deck templates), links to social media content, and other consortium news (such as installation updates and event invitations) were shared with all project partners. IMI regularly invited consortium partners to share their news content, images, and project activities for use in the newsletter.
title: Η τεχνολογία εμποδίων ως εναλλακτικό εργαλείο συντήρησης και βελτίωσης της ποιότητας των τροφίμων
title: Hurdle technology as an alternative tool for preservation and improvement of food quality
titleType: AlternativeTitle
Creators: name: Γκίνη, Γεωργία Βικτώρια
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Τεχνολογία εμποδίων
Hurdle technology

description: Η παρούσα εργασία αποτελεί μια ανασκόπηση των διαφορετικών επεξεργασιών που εφαρμόζονται στη βιομηχανία τροφίμων, καθώς και της συνδυασμένης εφαρμογής τους, που αποτελεί τον πυρήνα της μεθόδου της τεχνολογίας εμποδίων. Αναλύονται τα είδη των αλλοιώσεων που περιλαμβάνουν αλλοιώσεις μικροβιολογικής φύσεως, ενζυμικής δραστηριότητας, μηχανικών αιτίων, φυσικών παραγόντων, διαφόρων χημικών αντιδράσεων που μπορούν να λάβουν χώρα αλλά και παρουσίας ξένων σωμάτων όπως τα έντομα και τα τρωκτικά. Οι μέθοδοι επεξεργασίας που χρησιμοποιούνται συχνά δε μπορούν να εφαρμοσθούν μόνες τους, και ο συνδυασμός τους ενδέχεται να οδηγεί σε ικανοποιητικά αποτελέσματα και πιο ποιοτικά τελικά προϊόντα. Τα αδύνατα σημεία των συμβατικών μεθόδων και οι απαιτήσεις των καταναλωτών, οδηγούν τελικά στην εφαρμογή της τεχνολογίας εμποδίων. Η μέθοδος αυτή βασίζεται σε τρείς μηχανισμούς, της ομοιόστασης, της αντίδρασης σε συνθήκες στρες αλλά και της μεταβολικής εξάντλησης. Βασικότερος μηχανισμός είναι εκείνος της ομοιόστασης, αν και γενικά η βέλτιστη συντήρηση επιτυγχάνεται με συντήρηση πολλαπλών στόχων. Επιπροσθέτως, στην παρούσα εργασία παρατίθενται όλα εκείνα τα εμπόδια που επιλέγονται σε μεγαλύτερο βαθμό για την επεξεργασία και συντήρηση των τροφίμων. Αυτά μπορεί να είναι φυσικά εμπόδια μέσω της εφαρμογής θερμικής επεξεργασίας, ακτινοβόλησης, θερμοκρασίας συντήρησης, πίεσης και είδους συσκευασίας. Επιπλέον, τα εμπόδια μπορούν να είναι και φυσικοχημικά, για παράδειγμα αλλαγές στην ενεργότητα νερού, το pH, το οξειδοαναγωγικό δυναμικό, το χλωριούχο νάτριο αλλά και με τη χρήση οργανικών οξέων. Εκτός από τα ανωτέρω, που είναι τα πιο χρησιμοποιούμενα εμπόδια, συχνά επιλέγεται η χρήση μικροοργανισμών ως εμπόδια στην τεχνολογία τροφίμων, αλλά και νέες μέθοδοι όπως είναι η επεξεργασία με όζον και ψυχρό πλάσμα. Στη συνέχεια, αναλύονται οι χρήσεις της τεχνολογίας τροφίμων, ως μεθόδου επεξεργασίας στις εξής κατηγορίες τροφίμων: των φρούτων και λαχανικών, των κρεάτων και κρεατοσκευασμάτων, των ιχθυηρών και προϊόντων τους και των γαλακτοκομικών προϊόντων. Τέλος, μέσω της εν λόγω ανασκόπησης, γίνεται αντιληπτό πως η τεχνολογία εμποδίων είναι μια μέθοδος που συνεχώς εξελίσσεται μέσω της χρήσης νέων μεθόδων και νέων συνδυασμών εμποδίων, και μπορεί να δράσει θετικά προς όφελος της βιομηχανίας προϊόντων για την παραγωγή ασφαλών και ποιοτικών τροφίμων.
title: Die ehemalige Pulverfabrik in Rottweil am Neckar
Creators: name: Laule, Bernhard
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 13, Nr. 4 (1984), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Μελέτη και σύγκριση αλγόριθμων εξόρυξης
Creators: name: Παναγόπουλος, Θεόδωρος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Data mining

description: Η εξόρυξη δεδομένων έχει αποτελέσει έναν από τις σημαντικότερους τρόπους για την επεξεργασία δεδομένων τα τελευταία χρόνια, με σκοπό την εξαγωγή προτύπων για την παραγωγή νέων δεδομένων-πληροφοριών αλλά και την λήψη αποφάσεων. Πολλές φορές η ανθρώπινη άγνοια αλλά και η αδυναμία περίπλοκης σύνδεσης μεγάλου όγκου δεδομένων, δεν καθιστούν τις αναγκαίες αποφάσεις εμφανείς και εφικτές, αντίστοιχα. Σε κάθε τομέα όπου η μελέτη των δεδομένων του παρελθόντος μπορεί να αναγνωρίσει μελλοντικά περιστατικά, στα οποία χρειάζεται να παρθούν ανάλογες αποφάσεις, η εξόρυξη δεδομένων δίνει το ζητούμενο. Κάθε τομέας περιλαμβάνει μοτίβα, όπως ο χρηματιστηριακός, ο τομέας υγείας, η επιστήμη, ο εργασιακός τομέας, το μάρκετινγκ, οι πωλήσεις, η παρακολούθηση λειτουργίας μηχανημάτων, και άλλοι. Μικρό ποσοστό όμως αυτών χρησιμοποιούν την εξόρυξη δεδομένων για την λήψη μελλοντικών αποφάσεων, αν και όλοι εφαρμόζουν ήδη τρόπους για την καταγραφή μεγάλου όγκου πληροφοριών. Οι παραπάνω τομείς τέθηκαν στο προσκήνιο για την αναγνώριση της σημαντικότητας της χρήσης τεχνικών εξόρυξης δεδομένων. Τέτοια είναι όμως η φύση των τομέων εφαρμογής τους, όπου δεν είναι μόνο αυτοί με τις ιδιάζουσες μορφές δεδομένων που προσφέρουν, αλλά και ο εκάστοτε αναλυτής, που θα κρίνει σκόπιμη τη χρήση της μεθόδου Α, ή της Β. Οι στόχοι της εξόρυξης δεδομένων τίθενται από τον αναλυτή, όπου σκοπός του είναι η εύρεση κατάλληλης μεθόδου για την επίτευξη αυτών.