cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reducing the complexity of chemical networks via interpretable autoencoders
Creators: name: Grassi, T.
name: Nauman, F.
name: Ramsey, J. P.
name: Bovino, S.
name: Picogna, G.
name: Ercolano, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In many astrophysical applications, the cost of solving a chemical network represented by a system of ordinary differential equations (ODEs) grows significantly with the size of the network, and can often represent a significant computational bottleneck, particularly in coupled chemo-dynamical models. Although standard numerical techniques and complex solutions tailored to thermochemistry can somewhat reduce the cost, more recently, machine learning algorithms have begun to attack this challenge via data-driven dimensional reduction techniques. In this work, we present a new class of methods that take advantage of machine learning techniques to reduce complex data sets (autoencoders), the optimization of multi-parameter systems (standard backpropagation), and the robustness of well-established ODE solvers to to explicitly incorporate time-dependence. This new method allows us to find a compressed and simplified version of a large chemical network in a semi-automated fashion that can be solved with a standard ODE solver, while also enabling interpretability of the compressed, latent network. As a proof of concept, we tested the method on an astrophysically-relevant chemical network with 29 species and 224 reactions, obtaining a reduced but representative network with only 5 species and 12 reactions, and a x65 speed-up.
description: accepted A&A, code available at https://bitbucket.org/tgrassi/latent_ode_paper/
Walk/Zeta Correspondence
Creators: name: Komatsu, Takashi
name: Konno, Norio
name: Sato, Iwao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Our previous work presented explicit formulas for the generalized zeta function and the generalized Ihara zeta function corresponding to the Grover walk and the positive-support version of the Grover walk on the regular graph via the Konno-Sato theorem, respectively. This paper extends these walks to a class of walks including random walks, correlated random walks, quantum walks, and open quantum random walks on the torus by the Fourier analysis.
description: 31 pages
Carta de Moçambique - a tutela das obras audiovisuais e cinematográficas no ordenamento jurídico moçambicano
Creators: name: Murrure, Télio
Publisher: name: Propriedades Intelectuais
Year: 2017

description: Foi aprovada a Lei n.º 1/2017, de 6 de janeiro, doravante designada Lei do Áudio Visual e do Cinema (LAVC). Trata-se de um regime jurídico que versa sobre as atividades audiovisuais e cinematográficas que, por sinal, gravitam no âmbito material dos direitos autorais.
description: Propriedades Intelectuais, n. 7 (2017)
Three essays on the complex relationship between nonprofit commercialization and charitable giving
Creators: name: Lee, Cheon
Publisher: name: No Publisher Supplied
Year: 2022

description: Nonprofit scholars and practitioners have been concerned about nonprofit commercialization, increased reliance on commercial revenue, and its negative consequences. Among various topics related to nonprofit commercialization, the crowding-out effect of commercialization on charitable giving has received considerable scholarly attention. Although the literature leans towards showing crowding-out effects, such findings cannot fully explain the diffusion and prevalence of commercial practices in the nonprofit sector. This dissertation comprises three essays that explore the complex relationship between nonprofit commercialization and charitable giving. The first essay examines the relationship between nonprofit commercialization and charitable giving with the Cultural Data Project data on arts and culture nonprofit organizations. Contrary to previous studies focusing on linear relationships, this essay reveals an inverted U-shaped relationship between commercial revenue and charitable contributions and shows that commercial revenue crowds in charitable contributions up to a certain threshold and then starts to crowd them out. The second essay explores how individuals respond to nonprofit commercialization and whether it is possible to make nonprofit commercialization more acceptable to donors and stakeholders. Based on thematic and episodic message framing theory, a two-by-two factorial survey experiment finds that both thematic and episodic framing increase acceptance of a nonprofit’s decision to commercialize and increase participants’ willingness to donate and volunteer. The third essay shares the findings of a survey experiment asking individuals about charitable contributions that will be directly used to initiate new commercial revenue models. In the scenario that connects charitable giving and commercial revenue, loss framing was more effective than gain framing in increasing perceived organizational effectiveness regarding nonprofit commercialization, but positively framing nonprofit commercialization as social entrepreneurship was not effective in influencing individuals’ perceptions of nonprofit commercialization or willingness to donate. The findings reveal the complex relationship between nonprofit commercialization and charitable giving and show that the crowding-out effect can be prevented or mitigated by effectively communicating with donors and stakeholders.
Muon trigger with fast Neural Networks on FPGA, a demonstrator
Creators: name: Migliorini, Matteo
name: Pazzini, Jacopo
name: Triossi, Andrea
name: Zanetti, Marco
name: Zucchetta, Alberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The online reconstruction of muon tracks in High Energy Physics experiments is a highly demanding task, typically performed with programmable logic boards, such as FPGAs. Complex analytical algorithms are executed in a quasi-real-time environment to identify, select and reconstruct local tracks in often noise-rich environments. A novel approach to the generation of local triggers based on an hybrid combination of Artificial Neural Networks and analytical methods is proposed, targeting the muon reconstruction for drift tube detectors. The proposed algorithm exploits Neural Networks to solve otherwise computationally expensive analytical tasks for the unique identification of coherent signals and the removal of the geometrical ambiguities. The proposed approach is deployed on state-of-the-art FPGA and its performances are evaluated on simulation and on data collected from cosmic rays.
description: 14 pages, 13 figures
On-device Content-based Recommendation with Single-shot Embedding Pruning: A Cooperative Game Perspective
Creators: name: Tran, Hung Vinh
name: Chen, Tong
name: Ye, Guanhua
name: Nguyen, Quoc Viet Hung
name: Zheng, Kai
name: Yin, Hongzhi
Publisher: name: arXiv
Year: 2024
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Content-based Recommender Systems (CRSs) play a crucial role in shaping user experiences in e-commerce, online advertising, and personalized recommendations. However, due to the vast amount of categorical features, the embedding tables used in CRS models pose a significant storage bottleneck for real-world deployment, especially on resource-constrained devices. To address this problem, various embedding pruning methods have been proposed, but most existing ones require expensive retraining steps for each target parameter budget, leading to enormous computation costs. In reality, this computation cost is a major hurdle in real-world applications with diverse storage requirements, such as federated learning and streaming settings. In this paper, we propose Shapley Value-guided Embedding Reduction (Shaver) as our response. With Shaver, we view the problem from a cooperative game perspective, and quantify each embedding parameter's contribution with Shapley values to facilitate contribution-based parameter pruning. To address the inherently high computation costs of Shapley values, we propose an efficient and unbiased method to estimate Shapley values of a CRS's embedding parameters. Moreover, in the pruning stage, we put forward a field-aware codebook to mitigate the information loss in the traditional zero-out treatment. Through extensive experiments on three real-world datasets, Shaver has demonstrated competitive performance with lightweight recommendation models across various parameter budgets. The source code is available at https://github.com/chenxing1999/shaver
description: ACM Web Conference 2025 (WWW '25)
Carta de Macau - as patentes nos tribunais de Macau
Creators: name: Cabral, Gonçalo
Publisher: name: Propriedades Intelectuais
Year: 2017

description: De facto, enquanto anteriormente eram muito raros os pedidos de registo de patentes, o que é compreensívelnum território com apenas algumas centenas de milharesde consumidores e sem indústrias tecnológicas de relevo, a expansão da indústria do jogo provocou uma verdadeira corrida ao registo.
description: Propriedades Intelectuais, n. 7 (2017)
Xorides propinquus
Creators: name: Varga, O.
name: Kostro-Ambroziak, A.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Xorides
Xorides propinquus

description: Xorides propinquus (Tschek, 1869) M a t e r i a l. Non-type. Ukraine: Transcarpathian Reg., Vynogradiv, oak forest, 280 m, 48.1383 N, 23.0737 E, Malaise trap No. 1, 10.06– 02.07.2017, 1 ♀, 1 Ơ; 02– 22.07.2017, 1 ♀; sweeping, 03.05.2018, 1 ♀; trunk trap, 26.07– 18.08.2018, 1 ♀ (O. Varga) (SIZK). D i s t r i b u t i o n. Palaearctic; Ukraine: Crimea (Kasparyan, 1981), Kyiv (Varga, 2015 b) and Transcarpathian Regions. Remark. After examination of the type specimen of Xorides corcyrensis (Kriechbaumer, 1894) (figs 1–2, 4, 6), the first author found no morphological differences between this species and X. propinquus specimens collected in Ukraine, except for the narrow white ring on the antenna of X. propinquus. This mark is barely visible on the ventral side of the antennae in some of the females examined and is absent in the males, which calls into question the validity of X. corcyrensis. Furthermore, the type of X. fasciipennis (Kriechbaumer, 1894) (synonymised with X. annulator (Fabricius, 1804) by Horstmann, 2006) also shows similarities with the Ukrainian X. propinquus specimens, except for the red colouration of the metasoma, which can be variable in some Xorides spp. (see Johansson et al., 2022) and is common in other black-bodied ichneumonids found in dry and hot habitats, e. g. pimplines in southern Ukraine (figs 3, 5, 7). Thus, we suspect that all three names may represent different colour forms of a single species, but at present we refrain from making any definitive conclusions until molecular support can be presented.
description: Published as part of Varga, O. & Kostro-Ambroziak, A., 2023, New Records Of Poemeniinae And Xoridinae (Hymenoptera, Ichneumonidae) From Ukraine And Poland, With Corrections To The Ukrainian Checklist, pp. 277-282 in Zoodiversity 57 (3) on page 281, DOI: 10.15407/zoo2023.03.277, http://zenodo.org/record/8109204
description: {"references": ["Kasparyan, D. R. 1981. Subfamily Pimplinae (Ephialtinae). In: Medvedev, G. S. eds. Key to insects of European Territory of the USSR. Vol. 3. Hymenoptera. Part 3. Nauka, Leningrad, 41 - 97 [In Russian].", "Varga, O. 2015 b. A checklist of the Ukrainian Xoridinae (Hymenoptera, Ichneumonidae). Biodiversity Data Journal, 3 (e 4832), 1 - 17.", "Horstmann, K. 2006. Revisionen der von Kriechbaumer aus der Westpalaarktis und Zentralasien beschriebenen Ichneumonidae (Insecta, Hymenoptera). Spixiana, 29 (1), 1 - 30.", "Johansson, N., Hilszczanski, J. & Odegaard, F. 2022. Revision of the Scandinavian species of Xorides Latreille, 1809 (Hymenoptera: Ichneumonidae: Xoridinae), with an illustrated key to the species of Northern Europe. Entomologisk Tidskrift, 143 (4), 183 - 222."]}
title: Основы инженерной геологии
Creators: name: ELS IPR BOOKS
Publisher: name: Липецкий государственный технический университет, Профобразование
Year: 2023

description: В учебном пособии изложены общие сведения о геологии, приведены данные по минералам и горным породам, тектоническим явлениям, гидрогеологии. Особое место уделено вопросам изучения геологических и инженерно-геологических процессов и явлений. Подготовлено в соответствии с требованиями Федерального государственного образовательного стандарта среднего профессионального образования. Предназначено для изучения дисциплины «Основы инженерной геологии» по укрупненным группам специальностей 08.00.00 «Техника и технологии строительства», 21.00.00 «Прикладная геология, горное дело, нефтегазовое дело и геодезия».
Two dimensional metallic phases from disordered QED$_3$
Creators: name: Goswami, Pallab
name: Goldman, Hart
name: Raghu, Srinivas
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Metallic phases have been observed in several disordered two dimensional (2d) systems, including thin films near superconductor-insulator transitions and quantum Hall systems near plateau transitions. The existence of 2d metallic phases at zero temperature generally requires an interplay of disorder and interaction effects. Consequently, experimental observations of 2d metallic behavior have largely defied explanation. We formulate a general stability criterion for strongly interacting, massless Dirac fermions against disorder, which describe metallic ground states with vanishing density of states. We show that (2+1)-dimensional quantum electrodynamics (QED$_3$) with a large, even number of fermion flavors remains metallic in the presence of weak scalar potential disorder due to the dynamic screening of disorder by gauge fluctuations. We also show that QED$_3$ with weak mass disorder exhibits a stable, dirty metallic phase in which both interactions and disorder play important roles.
description: 12 pages, including four appendices and one figure
OpenMS WebApps: Building User-Friendly Solutions for MS Analysis
Creators: name: Müller, Tom David
name: Siraj, Arslan
name: Walter, Axel
name: Kim, Jihyung
name: Wein, Samuel
name: von Kleist, Johannes
name: Feroz, Ayesha
name: Pilz, Matteo
name: Jeong, Kyowon
name: Sing, Justin Cyril
name: Charkow, Joshua
name: Röst, Hannes Luc
name: Sachsenberg, Timo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Biomolecules (q-bio.BM)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Liquid Chromatography Mass Spectrometry (LC-MS) is an indispensable analytical technique in proteomics, metabolomics, and other life sciences. While OpenMS provides advanced open-source software for MS data analysis, its complexity can be challenging for non-experts. To address this, we have developed OpenMS WebApps, a framework for creating user-friendly MS web applications based on the Streamlit Python package. OpenMS WebApps simplifies MS data analysis through an intuitive graphical user interface, interactive result visualizations, and support for both local and online execution. Key features include workspaces management, automatic generation of input widgets, and parallel execution of tools resulting in highperformance and ready-to-use solutions for online and local deployment. This framework benefits both researchers and developers: scientists can focus on their research without the burden of complex software setups, and developers can rapidly create and distribute custom WebApps with novel algorithms. Several applications built on the OpenMS WebApps template demonstrate its utility across diverse MS-related fields, enhancing the OpenMS eco-system for developers and a wider range of users. Furthermore, it integrates seamlessly with third-party software, extending benefits to developers beyond the OpenMS community.
description: 19 pages, 5 figures
Service Function Chaining in MEC: A Mean-Field Game and Reinforcement Learning Approach
Creators: name: Abouaomar, Amine
name: Cherkaoui, Soumaya
name: Mlika, Zoubeir
name: Kobbane, Abdellatif
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Multi-access edge computing (MEC) and network virtualization technologies are important enablers for fifth-generation (5G) networks to deliver diverse applications and services. Services are often provided as fully connected virtual network functions (VNF)s, through service function chaining (SFC). However, the problem of allocating SFC resources at the network edge still faces many challenges related to the way VNFs are placed, chained and scheduled. In this paper, to solve these problems, we propose a game theory-based approach with the objective to reduce service latency in the context of SFC at the network edge. The problem of allocating SFC resources can be divided into two subproblems. 1) The VNF placement and routing subproblem, and 2) the VNF scheduling subproblem. For the former subproblem, we formulate it as a mean field game (MFG) in which VNFs are modeled as entities contending over edge resources with the goal of reducing the resource consumption of MEC nodes and reducing latency for users. We propose a on a reinforcement learning-based technique, where the Ishikawa-Mann learning algorithm (IMLA) is used. For the later subproblem we formulate it as a matching game between the VFNs and an edge resources in order to find the execution order of the VNFs while reducing the latency. To efficiently solve it, we propose a modified version of the many-to-one deferred acceptance algorithm (DAA), called the enhanced multi-step deferred acceptance algorithm (eMSDA). To illustrate the performance of the proposed approaches, we perform extensive simulations. The obtained results show that the proposed approaches outperform the benchmarks other state-of-the-art methods.
Direito de autor
Creators: name: Antunes, Henrique Sousa
name: Bruguière, Jean-Michel
Publisher: name: Propriedades Intelectuais
Year: 2017

description: Henrique Sousa Antunes debruça-se sobre o Acórdão Stowarzyszenie «Olawska Telewizja Kablowa» contra Stowarzyszenie Filmowców Polskich, de 25 de janeiro de 2017 (Processo C-367/15); e Jean-Michel Bruguière analisa a exploração dos direitos gestão coletiva.
description: Propriedades Intelectuais, n. 7 (2017)
Tuning the Fermi velocity in Dirac materials with an electric field
Creators: name: Diaz-Fernandez, A.
name: Chico, L.
name: Gonzalez, J. W.
name: Dominguez-Adame, F.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene and topological insulators. Band-engineering techniques should aim to a full control of the parameter that characterizes the Dirac cones: the Fermi velocity. We propose a general mechanism that enables the fine-tuning of the Fermi velocity in Dirac materials in a readily accessible way for experiments. By embedding the sample in a uniform electric field, the Fermi velocity is substantially modified. We first prove this result analytically, for the surface states of a topological insulator/semiconductor interface, and postulate its universality to other Dirac materials. Then we check its correctness in carbon-based Dirac materials, namely graphene nanoribbons and nanotubes, thus showing the validity of our hypothesis in both continuum and tight-binding calculations and in different Dirac systems.
Xorides sapporensis
Creators: name: Varga, O.
name: Kostro-Ambroziak, A.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Xorides
Xorides sapporensis

description: Xorides sapporensis (Uchida, 1928) D i s t r i b u t i o n. Oriental and Palaearctic; Ukraine: Kyiv Reg. (see below). Remark. Xorides sapporensis has not previously been listed from Ukraine. Johansson et al. (2022) recently synonymized Xorides hedwigi Clément, 1938 with X. sapporensis. Thus, the name should be applied for the Ukrainian record of X. hedwigi published in Varga (2015 b).
description: Published as part of Varga, O. & Kostro-Ambroziak, A., 2023, New Records Of Poemeniinae And Xoridinae (Hymenoptera, Ichneumonidae) From Ukraine And Poland, With Corrections To The Ukrainian Checklist, pp. 277-282 in Zoodiversity 57 (3) on page 281, DOI: 10.15407/zoo2023.03.277, http://zenodo.org/record/8109204
description: {"references": ["Johansson, N., Hilszczanski, J. & Odegaard, F. 2022. Revision of the Scandinavian species of Xorides Latreille, 1809 (Hymenoptera: Ichneumonidae: Xoridinae), with an illustrated key to the species of Northern Europe. Entomologisk Tidskrift, 143 (4), 183 - 222.", "Varga, O. 2015 b. A checklist of the Ukrainian Xoridinae (Hymenoptera, Ichneumonidae). Biodiversity Data Journal, 3 (e 4832), 1 - 17."]}
Direito da propriedade industrial
Creators: name: Mendes, Manuel Oehen
name: Mendes, Evaristo
name: Andrade, António
name: Mioludo, João Paulo
Publisher: name: Propriedades Intelectuais
Year: 2017

description: Manuel Oehen Mendes e Evaristo Mendes analisam as patentes de medicamentos e a arbitragem necessária, ao passo que Antonio Andrade se foca nos conceitos de arbitragem voluntária e arbitragem necessária no que diz respeito às patentes. João Paulo Mioludo regressa ao tema da Marca à sua caducidade por falta de uso.
description: Propriedades Intelectuais, n. 7 (2017)
Enhancing Security of TAS/MRC Based Mixed RF-UOWC System with Induced Underwater Turbulence Effect
Creators: name: Ibrahim, Md.
name: Badrudduza, A. S. M.
name: Hossen, Md. Shakhawat
name: Kundu, Milton Kumar
name: Ansari, Imran Shafique
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Post commercial deployment of fifth-generation (5G) technologies, the consideration of sixth-generation (6G) networks is drawing remarkable attention from research communities. Researchers suggest that similar to 5G, 6G technology must be human-centric where high secrecy together with high data rate will be the key features. These challenges can be easily overcome utilizing PHY security techniques over high-frequency free-space or underwater optical wireless communication (UOWC) technologies. But in long-distance communication, turbulence components drastically affect the optical signals, leading to the invention of the combination of radio-frequency (RF) links with optical links. This work deals with the secrecy performance analysis of a mixed RF-UOWC system where an eavesdropper tries to intercept RF communications. RF and optical links undergo $η-μ$ and mixture exponential generalized Gamma distributions, respectively. To keep pace with the high data rate of optical technologies, we exploit the antenna selection scheme at the source and maximal ratio combining diversity at the relay and eavesdropper, while the eavesdropper is unaware of the antenna selection scheme. We derive closed-form expressions of average secrecy capacity, secrecy outage probability, and strictly positive secrecy capacity to demonstrate the impacts of the system parameters on the secrecy behavior. Finally, the expressions are corroborated via Monte-Carlo simulations.
CMB internal delensing with general optimal estimator for higher-order correlations
Creators: name: Namikawa, Toshiya
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a new method for delensing $B$ modes of the cosmic microwave background (CMB) using a lensing potential reconstructed from the same realization of the CMB polarization (CMB internal delensing). The $B$-mode delensing is required to improve sensitivity to primary $B$ modes generated by, e.g., the inflationary gravitational waves, axion-like particles, modified gravity, primordial magnetic fields, and topological defects such as cosmic strings. However, the CMB internal delensing suffers from substantial biases due to correlations between observed CMB maps to be delensed and that used for reconstructing a lensing potential. We construct a realization-dependent (RD) estimator for correcting these biases by deriving a general optimal estimator for higher-order correlations. The RD estimator is less sensitive to simulation uncertainties. Compared to the previous methods, we find that the RD estimator corrects the biases without substantial degradation of the delensing efficiency.
description: 18 pages, 8 figures, accepted for publication in PRD
Koopman with inputs and control for constitutive law identification
Creators: name: Southern, Emily Jayne
Publisher: name: Imperial College London
Year: 2022

description: Constitutive laws characterise the stress-strain relationship in a material. Determining a consti- tutive law experimentally typically involves subjecting the material to a prescribed deformation and measuring the force required to achieve it. There are numerous constitutive laws which have been developed to model the stress response of viscoelastic fluids, and the decision on which constitutive law should be fitted to data is largely based on the rheologist’s knowledge about the fluid in relation to the catalogue of standard models appearing in the literature. In this thesis, we present an alternative approach for determining a viscoelastic fluid’s constitutive law based on methods related to Koopman operator theory and Dynamic Mode Decomposition in the context of control. Our approach systematically extracts the material parameters that arise in stress-evolution equations of viscoelastic fluids directly from simulation or experimen- tal data. We will present results from various applications of the framework that highlight its accuracy and robustness in identifying material parameters and reconstructing the under- lying constitutive law. We will discuss how data should be supplied to the method, and also demonstrate how data from recently developed experimental protocols, as well as combined data from multiple experiments, can be used to improve resolution. Finally, we will show that our approach provides a natural way to utilise data from the nonlinear regime and extends to higher-dimensional data sets where spatial data within a sample is available.
Predicting scaling properties from a single fluid configuration
Creators: name: Schrøder, Thomas B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Time-dependent dynamical properties of a fluid can not be estimated from a single configuration without performing a simulation. Here we show, however, that the scaling properties of both structure and dynamics can be predicted from a single configuration. The new method is demonstrated to work very well for equilibrium dynamics of the Kob-Andersen Binary Lennard-Jones mixture. Furthermore, the method is applied to isobaric cooling where the liquid falls out of equilibrium and forms a glass, demonstrating that the method requires neither equilibrium nor constant volume conditions to work, in contrast to existing methods.
description: 11 pages, 5 figures
Finite resolution effects in p-leader multifractal analysis
Creators: name: Leonarduzzi, Roberto
name: Wendt, Herwig
name: Abry, Patrice
name: Jaffard, Stéphane
name: Melot, Clothilde
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Multifractal analysis has become a standard signal processing tool,for which a promising new formulation, the p-leader multifractal formalism, has recently been proposed. It relies on novel multiscale quantities, the p-leaders, defined as local l^p norms of sets of wavelet coefficients located at infinitely many fine scales. Computing such infinite sums from actual finite-resolution data requires truncations to the finest available scale, which results in biased p-leaders and thus in inaccurate estimates of multifractal properties. A systematic study of such finite-resolution effects leads to conjecture an explicit and universal closed-form correction that permits an accurate estimation of scaling exponents. This conjecture is formulated from the theoretical study of a particular class of models for multifractal processes, the wavelet-based cascades. The relevance and generality of the proposed conjecture is assessed by numerical simulations conducted over a large variety of multifractal processes. Finally, the relevance of the proposed corrected estimators is demonstrated on the analysis of heart rate variability data.
description: 10 pages, accepted in IEEE Transactions in Signal Processing
Finite size analysis of the detectability limit of the stochastic block model
Creators: name: Young, Jean-Gabriel
name: Desrosiers, Patrick
name: Hébert-Dufresne, Laurent
name: Laurence, Edward
name: Dubé, Louis J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: It has been shown in recent years that the stochastic block model (SBM) is sometimes undetectable in the sparse limit, i.e., that no algorithm can identify a partition correlated with the partition used to generate an instance, if the instance is sparse enough and infinitely large. In this contribution, we treat the finite case explicitly, using arguments drawn from information theory and statistics. We give a necessary condition for finite-size detectability in the general SBM. We then distinguish the concept of average detectability from the concept of instance-by-instance detectability and give explicit formulas for both definitions. Using these formulas, we prove that there exist large equivalence classes of parameters, where widely different network ensembles are equally detectable with respect to our definitions of detectability. In an extensive case study, we investigate the finite-size detectability of a simplified variant of the SBM, which encompasses a number of important models as special cases. These models include the symmetric SBM, the planted coloring model, and more exotic SBMs not previously studied. We conclude with three appendices, where we study the interplay of noise and detectability, establish a connection between our information-theoretic approach and random matrix theory, and provide proofs of some of the more technical results.
description: 18 pages, 4 figures
A cláusula geral do direito da concorrência desleal à luz da diligência profissional
Creators: name: Koppensteiner, Hans-Georg
Publisher: name: Propriedades Intelectuais
Year: 2017

description: Discussão em torno da diretiva 2005/29/CE, relativa às práticas comerciais desleais das empresas face aos consumidores no mercado interno. Tal como o título indica, dirige-se exclusivamente às relações entre as empresas e os consumidores, frequentemente chamadas business to consumers (abreviadamente, B2C). Ressalvadas certas exceções que se prendem com outras diretivas, os Estados-membros são livres, por outras palavras, de procederem como acharem melhor, no que respeita à disciplina das relações concorrenciais entre empresas (em versão abreviada, B2B).
description: Propriedades Intelectuais, n. 7 (2017)
Semileptonic form factors for $B \to D^\ast\ellν$ at nonzero recoil from 2 + 1-flavor lattice QCD
Creators: name: Bazavov, A.
name: DeTar, C. E.
name: Du, Daping
name: El-Khadra, A. X.
name: Gámiz, E.
name: Gelzer, Z.
name: Gottlieb, Steven
name: Heller, U. M.
name: Kronfeld, A. S.
name: Laiho, J.
name: Mackenzie, P. B.
name: Simone, J. N.
name: Sugar, R.
name: Toussaint, D.
name: Van de Water, R. S.
name: Vaquero, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the first unquenched lattice-QCD calculation of the form factors for the decay $B\rightarrow D^\ast\ellν$ at nonzero recoil. Our analysis includes 15 MILC ensembles with $N_f=2+1$ flavors of asqtad sea quarks, with a strange quark mass close to its physical mass. The lattice spacings range from $a\approx 0.15$ fm down to $0.045$ fm, while the ratio between the light- and the strange-quark masses ranges from 0.05 to 0.4. The valence $b$ and $c$ quarks are treated using the Wilson-clover action with the Fermilab interpretation, whereas the light sector employs asqtad staggered fermions. We extrapolate our results to the physical point in the continuum limit using rooted staggered heavy-light meson chiral perturbation theory. Then we apply a model-independent parametrization to extend the form factors to the full kinematic range. With this parametrization we perform a joint lattice-QCD/experiment fit using several experimental datasets to determine the CKM matrix element $|V_{cb}|$. We obtain $\left|V_{cb}\right| = (38.40 \pm 0.68_{\textrm{th}} \pm 0.34_{\textrm{exp}} \pm 0.18_{\textrm{EM}})\times 10^{-3}$. The first error is theoretical, the second comes from experiment and the last one includes electromagnetic and electroweak uncertainties, with an overall $χ^2\text{/dof} = 126/84$, which illustrates the tensions between the experimental data sets, and between theory and experiment. This result is in agreement with previous exclusive determinations, but the tension with the inclusive determination remains. Finally, we integrate the differential decay rate obtained solely from lattice data to predict $R(D^\ast) = 0.265 \pm 0.013$, which confirms the current tension between theory and experiment.
description: 46 pages, 14 figures. Synthetic data, results and full correlation matrices available in the ancillary files. Version accepted for publication in EPJ C
A implementação do sistema de acesso a patrimônio genético e conhecimento tradicional associado e repartição de benefícios: os desafios da experiência brasileira analisados do ponto de vista internacional
Creators: name: Silva, Aline Ferreira De Carvalho Da
Publisher: name: Propriedades Intelectuais
Year: 2017

description: A falta de precisa delimitação do escopo dos direitos resultantes da obrigação de repartição de benefícios criou insegurança jurídica e potencialmente pode levar a uma desarmonia das legislações nacionais a respeito de acesso e repartição de benefícios. Aliás, a experiência brasileira serve para ilustrar, com base nos exemplos acima, como o sistema idealizado poderá ser inviabilizado diante da vagueza da linguagem dos Tratados e da soberania dos membros ao implementá-los.
description: Propriedades Intelectuais, n. 7 (2017)
State Estimation for a portal advancing mechanism by measuring the pressure in hydraulic actuators
Creators: name: Beiser, Sebastian
name: Michiels, Lukas
name: Geimer, Marcus
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2023
Subjects: Extended Kalman Filter
state estimation
system simulation
portal advancing mechanism

description: Leg-driven machines require complex control systems to ensure stability and safety. Instead of measuring the complete system state, state estimation and prediction can be used to observe the system state in hydraulically actuated systems to replace expensive sensors. In this paper, we consider the portal advancing mechanism, a legged locomotive mechanism. The overall machine consists of two bases with three hydraulically actuated legs each and a bridge on top of them. An upper carriage with a forestry crane can move along the bridge. A system is proposed that estimates the position of the carriage. The Extended Kalman Filter (EKF) handles the non-linearity of the system and provides information about the uncertainty of the state estimation. The load on the hydraulically actuated legs is different for every carriage position on top of the mechanism. We assume that the dynamic effects of the movement can be modeled with a linear model. The state is described by the position, velocity, and acceleration of the center of gravity of the machine’s upper carriage. The non-linear relation between the state vector and the pressures in the hydraulic actuators is linearized in the innovation step of the applied filter. The proposed system is evaluated in a multibody machine simulation with hydraulic co-simulation. The proposed system reduces the number of required sensors on this type of walking forestry machine as the movements do not need to be captured directly. The results show that modern state estimation and prediction can support predictive control of complex, dynamic hydraulically driven systems.
A Organização Mundial da Propriedade Intelectual (WIPO) contribui decisivamente para o enforcement
Creators: name: Sousa, José Mário Lopes Freire De
Publisher: name: Propriedades Intelectuais
Year: 2016

description: Síntese da 11.ª sessão do Advisory Committee on Enforcement (ACE) que teve lugar em Genebra entre os dias 5 e 7. Durante estes três dias, delegações de 23 países, incluindo Portugal, partilharam as suas experiências nacionais no domínio do enforcement.
description: Propriedades Intelectuais, n. 6 (2016)
Metastability for the degenerate Potts Model with negative external magnetic field under Glauber dynamics
Creators: name: Bet, Gianmarco
name: Gallo, Anna
name: Nardi, Francesca R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We consider the ferromagnetic q-state Potts model on a finite grid graph with non-zero external field and periodic boundary conditions. The system evolves according to Glauber-type dynamics described by the Metropolis algorithm, and we focus on the low temperature asymptotic regime. We analyze the case of negative external magnetic field. In this scenario there are $q-1$ stable configurations and a unique metastable state. We describe the asymptotic behavior of the first hitting time from the metastable to the set of the stable states as $β\to\infty$ in probability, in expectation, and in distribution. We also identify the exponent of the mixing time and find an upper and a lower bound for the spectral gap. We identify the union of all minimal gates for the transition from the metastable state both to the set of the stable states and to a fixed stable state. Furthermore, we identify the tube of typical trajectories for these two transitions. The accurate knowledge of the energy landscape allows us to give precise asymptotics for the expected transition time from the unique metastable state to the set of the stable configurations.
description: 45 pages, 17 figures
Analytic approach to magneto-strain tuning of electronic transport through a graphene nanobubble: Perspectives for a strain sensor
Creators: name: Muñoz, Enrique
name: Soto-Garrido, Rodrigo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider the scattering of Dirac particles in graphene due to the superposition of an external magnetic field and mechanical strain. As a model for a graphene nanobubble, we find exact analytical solutions for single-particle states inside and outside a circular region submitted to the fields. Finally, we obtain analytical expressions for the scattering cross-section, as well as for the Landauer current through the circular region. Our results provide a fully-analytical treatment for electronic transport through a graphene nanobubble, showing that a combination of a physical magnetic field and strain leads to valley polarization and filtering of the electronic current. Moreover, our analytical model provides an explicit metrology principle to measure strain by performing conductance experiments under a controlled magnetic field imposed over the sample.
description: V2 19 pages, 8 figures, 34 references. Title changed, expanded discussion and a new conclusions and summary section. Version accepted for publication in the Journal of Physics: Condensed Matter
Limits of quantum speed-ups for computational geometry and other problems: Fine-grained complexity via quantum walks
Creators: name: Buhrman, Harry
name: Loff, Bruno
name: Patro, Subhasree
name: Speelman, Florian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Complexity (cs.CC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Many computational problems are subject to a quantum speed-up: one might find that a problem having an O(n^3)-time or O(n^2)-time classic algorithm can be solved by a known O(n^1.5)-time or O(n)-time quantum algorithm. The question naturally arises: how much quantum speed-up is possible? The area of fine-grained complexity allows us to prove optimal lower-bounds on the complexity of various computational problems, based on the conjectured hardness of certain natural, well-studied problems. This theory has recently been extended to the quantum setting, in two independent papers by Buhrman, Patro, and Speelman (arXiv:1911.05686), and by Aaronson, Chia, Lin, Wang, and Zhang (arXiv:1911.01973). In this paper, we further extend the theory of fine-grained complexity to the quantum setting. A fundamental conjecture in the classical setting states that the 3SUM problem cannot be solved by (classical) algorithms in time O(n^{2-a}), for any a>0. We formulate an analogous conjecture, the Quantum-3SUM-Conjecture, which states that there exist no sublinear O(n^{1-b})-time quantum algorithms for the 3SUM problem. Based on the Quantum-3SUM-Conjecture, we show new lower-bounds on the time complexity of quantum algorithms for several computational problems. Most of our lower-bounds are optimal, in that they match known upper-bounds, and hence they imply tight limits on the quantum speedup that is possible for these problems.
Homodyne versus photon-counting quantum trajectories for dissipative Kerr resonators with two-photon driving
Creators: name: Bartolo, Nicola
name: Minganti, Fabrizio
name: Lolli, Jared
name: Ciuti, Cristiano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate two different kinds of quantum trajectories for a nonlinear photon resonator subject to two-photon pumping, a configuration recently studied for the generation of photonic Schroedinger cat states. In the absence of feedback control and in the strong-driving limit, the steady-state density matrix is a statistical mixture of two states with equal weight. While along a single photon-counting trajectory the systems intermittently switches between an odd and an even cat state, we show that upon homodyne detection the situation is different. Indeed, homodyne quantum trajectories reveal switches between coherent states of opposite phase.
description: To appear on Eur. Phys. J. Special Topics, Quantum Gases and Quantum Coherence; 8 pages, 2 composed figures (5 panels)
PIF-PAF Digital
Creators: name: Marcondes, Juliana
Publisher: name: Propriedades Intelectuais
Year: 2016

description: Juliana Marcondes analisa o caso de Millôr Fernandes - escritor, humorista e jornalista brasileiro. Quando parte da sua obra foi disponibilizado pela editora em formato digital, o autor contestou a nova utilização da sua obra sem autorização.
description: Propriedades Intelectuais, n. 6 (2016)
Superradiant instability of massive vector fields around spinning black holes in the relativistic regime
Creators: name: East, William E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the superradiant instability of massive vector fields, i.e. Proca fields, around spinning black holes in the test field limit. This is motivated by the possibility that observations of astrophysical black holes can probe the existence of ultralight bosons subject to this mechanism. By making use of time-domain simulations, we characterize the growth rate, frequency, spatial distribution, and other properties of the unstable modes, including in the regime where the black hole is rapidly spinning and the Compton wavelength of the Proca field is comparable to the black hole radius. We find that relativistic effects in this regime increase the range of Proca masses that are unstable, as well as the maximum instability rate. We also study the gravitational waves that can be sourced by such an instability, finding that they can be significantly stronger than in the massive scalar field case.
description: 13 pages, 13 figures; revised to match PRD version
The Diverse Club: The Integrative Core of Complex Networks
Creators: name: Bertolero, M. A.
name: Yeo, B. T. T.
name: D'Esposito, M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A complex system can be represented and analyzed as a network, where nodes represent the units of the network and edges represent connections between those units. For example, a brain network represents neurons as nodes and axons between neurons as edges. In many networks, some nodes have a disproportionately high number of edges. These nodes also have many edges between each other, and are referred to as the rich club. In many different networks, the nodes of this club are assumed to support global network integration. However, another set of nodes potentially exhibits a connectivity structure that is more advantageous to global network integration. Here, in a myriad of different biological and man-made networks, we discover the diverse club--a set of nodes that have edges diversely distributed across the network. The diverse club exhibits, to a greater extent than the rich club, properties consistent with an integrative network function--these nodes are more highly interconnected and their edges are more critical for efficient global integration. Moreover, we present a generative evolutionary network model that produces networks with a diverse club but not a rich club, thus demonstrating that these two clubs potentially evolved via distinct selection pressures. Given the variety of different networks that we analyzed--the c. elegans, the macaque brain, the human brain, the United States power grid, and global air traffic--the diverse club appears to be ubiquitous in complex networks. These results warrant the distinction and analysis of two critical clubs of nodes in all complex systems.
O (in)imitável caso de Tom Waits
Creators: name: Ruivo, Inês De Castro
Publisher: name: Propriedades Intelectuais
Year: 2016

description: A utilização das canções de Waits no espetáculo equestre não é o único motivo da discórdia. No entender do artista, o espetáculo evoca claramente o seu universo, sombrio e misterioso, e mesmo a sua aparência. A personagem principal, corporizada pelo próprio encenador, Bartabas, assemelha-se a Waits, tanto no figurino como na teatralidade.
description: Propriedades Intelectuais, n. 6 (2016)