cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
IMPACT TECHNIQUE ASSOCIATIVE AMENE PAR WORLD VISION SUR LA VIE DES ADHERENTS DE LA COMMUNE DE KIMBANSEKE
Creators: name: BOSANZA BONDEL Dieudonné
name: MASOMI  SABE Aimé
Publisher: name: Zenodo
Year: 2024

description: En RDC, les conditions de vie des populations n’ont cessé de se détériorer avec le désengagement de l’Etat des secteurs pourvoyeurs d’emplois. L’expérience a montré que les approches collectives de l’épargne peuvent aider les pauvres à épargner plus efficacement, en particulier lorsque l’accès aux services d’épargne, tels que les banques ou les autres services financiers, est difficile.

Nous avons utilisé la méthode d’enquête et les techniques de questionnaire, documentaire et d’observation pour rendre cet article possible.

A l’issu de cette recherche, nous avons obtenu les résultats ci-après : les membres des associations villageoises d’épargne et de crédit constitue d’épargne afin d’obtenir les crédits, ce qui leurs permettent d’améliorer tant soit peu leurs conditions de vie : logement, nourriture, création des activités génératrices de revenus…
Condensation convective à faible vitesse massique : Analyse des phénomènes thermohydrauliques locaux
Creators: name: Beaumale, Marion
name: Lavieille, Pascal
name: Miscevic, Marc
Publisher: name: Société Française de Thermique
Year: 2022
Subjects: condensation convective
métrologie optique
coefficient d'échange
expérimental

description: Le dimensionnement des condenseurs équipant les systèmes de régulation thermique diphasique nécessite une compréhension du couplage entre les transferts de chaleur et la répartition des phases liquide et vapeur au sein des écoulements. Lorsque les vitesses massiques sont faibles, de l'ordre de celles rencontrées dans les systèmes passifs de type CPL ou LHP, les lois disponibles dans la littérature ne sont plus valides. L'objectif de ce travail est donc de contribuer à combler ce manque en développant une approche expérimentale permettant d'étudier les couplages entre transferts de chaleur, de masse et de quantité de mouvement au sein d'écoulement de condensation à faible vitesse massique. L'objectif est notamment de mesurer simultanément et de corréler l'évolution du coefficient de transfert de chaleur local avec celle de l'épaisseur de film de liquide afin de proposer des lois de dimensionnement. Pour cela un banc expérimental a été développé permettant d'étudier la condensation du HFE 7000 en écoulement vertical descendant. Afin d'utiliser des techniques de mesures optiques, le condenseur utilisé est en saphir, matériau transparent et conducteur, dont le refroidissement est obtenu grâce à un écoulement d'air conditionné en convection forcée. Les dimensions du condenseur (section circulaire de diamètre interne de 3,4 mm, de diamètre externe de 6 mm et d'une longueur de 1 m) permettent d'étudier la condensation complète (titre massique en vapeur variant de 1 à 0) du fluide pour des vitesses massiques allant de 5 à 30 kg/m²/s. Les mesures sont réalisées en régime permanent grâce à un écoulement stabilisé entre deux réservoirs à pression constante dont le débit est ajusté à l'aide d'une vanne micrométrique. La métrologie mise en œuvre combine deux techniques de mesures de haute précision permettant la mesure locale et simultanée de la température de la paroi du condenseur par méthode infrarouge et de l'épaisseur du film de liquide ruisselant sur la paroi par méthode interférométrique ou confocale. Cette instrumentation permet de développer une analyse à la fois hydraulique et thermique des processus mis en jeu. Le banc d'essais, le protocole spécifique développé et les résultats expérimentaux seront présentés dans cette communication.
Thermo-hydraulic analysis of the flat plate pulsating heat pipe tested under $\mu$–gravity conditions
Creators: name: Slobodeniuk, Maksym
name: Ravichandran, Rajalakshmi
name: Bertossi, Remi
name: Ayel, Vincent
name: Romestant, Cyril
name: Bertin, Yves
Publisher: name: Société Française de Thermique
Year: 2022
Subjects: Pulsating Heat Pipe
Microgravity
Thermal Performance
Flow Transition

description: The high power and performance electronic devices in modern spacecraft systems with heat generation of hundreds of Watts per square centimeter crucially increases needs in high performance, low weight, energy efficient and reliable thermal management systems. Pulsating Heat Pipe (PHP) as a passive two-phase heat transfer device based on phase change induced motions of working fluid from evaporator to condenser could become a novel thermal management system due to high heat transfer capability, simple structure and ability of operating under different gravity levels and different positions. However, this relatively new technology with very complex thermo-hydrodynamic mechanisms inside is not fully studied and needs further investigations. \\ This work presents synthesis of the results obtained during 64th and 69th ESA Parabolic Flight Campaigns for the flat plate pulsating heat pipe tested under microgravity conditions in order to thermal performance investigations and liquid-vapor interfaces oscillation influence on the flow pattern inside the device. \\ Tested flat plate pulsating heat pipes represent a copper (64th PFC) / molybdenum (69th PFC) plate with milled squire shape channels (1.5 and 3 mm$^2$) covered by the sapphire cover plate to allow visual analysis of the flow inside. Ethanol and dielectric fluid FC-72 were chosen as working fluids with volumetric filling ratio of 50 \%. \\ Microgravity periods are mostly characterized by the significant temperature augmentation in the evaporator zone. This temperature rise is a result of fluid accumulation in the condenser and dry-out of evaporator ? heat transfers only by the FPPHP wall conduction.\\ Sometimes evaporator temperature drops because of flow pattern change from slug-plug to semi-annular and fluid reflows to the evaporator. This phenomenon was called ``flow re-activation'' and observed only for few cases during microgravity phases. Video post-processing was performed to define flow parameters influencing flow transition for microgravity conditions, as well as to determine liquid plugs velocities and accelerations. Classical criteria (We, Bo, Ga, Fr) used for slug-plug flow pattern definition were validated. Finally, the acting forces during stopover and re-activation were calculated.
Breaking the Sample Size Barrier in Model-Based Reinforcement Learning with a Generative Model
Creators: name: Li, Gen
name: Wei, Yuting
name: Chi, Yuejie
name: Chen, Yuxin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Information Theory (cs.IT)
subject: Optimization and Control (math.OC)
subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This paper is concerned with the sample efficiency of reinforcement learning, assuming access to a generative model (or simulator). We first consider $γ$-discounted infinite-horizon Markov decision processes (MDPs) with state space $\mathcal{S}$ and action space $\mathcal{A}$. Despite a number of prior works tackling this problem, a complete picture of the trade-offs between sample complexity and statistical accuracy is yet to be determined. In particular, all prior results suffer from a severe sample size barrier, in the sense that their claimed statistical guarantees hold only when the sample size exceeds at least $\frac{|\mathcal{S}||\mathcal{A}|}{(1-γ)^2}$. The current paper overcomes this barrier by certifying the minimax optimality of two algorithms -- a perturbed model-based algorithm and a conservative model-based algorithm -- as soon as the sample size exceeds the order of $\frac{|\mathcal{S}||\mathcal{A}|}{1-γ}$ (modulo some log factor). Moving beyond infinite-horizon MDPs, we further study time-inhomogeneous finite-horizon MDPs, and prove that a plain model-based planning algorithm suffices to achieve minimax-optimal sample complexity given any target accuracy level. To the best of our knowledge, this work delivers the first minimax-optimal guarantees that accommodate the entire range of sample sizes (beyond which finding a meaningful policy is information theoretically infeasible).
description: accepted Operations Research
Characterization of Physical and Structural Properties of Brass Powder After Biofield Treatment
Creators: name: Trivedi, Mahendra
Publisher: name: SMN - The ScienceMedia Network
Year: 2016
Subjects: Natural Sciences
Chemistry

description: Brass, a copper-zinc (Cu-Zn) alloy has gained extensive attention in industries due to its high corrosion resistance, machinability and strength to weight ratio. The aim of present study was to evaluate the effect of biofield treatment on structural and physical properties of brass powder. The brass powder sample was divided into two parts: control and treated. The treated part was subjected to Mr.Trivedi’s biofield treatment. Control and treated brass powder were characterized using particle size analyser, X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The result showed that the average particle size, d50and d99 (size below which 99% particles were present) were reduced up to 44.3% and 56.4%, respectively as compared to control. XRD result revealed that the unit cell volume in treated brass powder was increased up to 0.19% as compared to control. Besides, the crystallite size of brass powder was significantly increased up to 100.5% as compared to control, after biofield treatment. Furthermore, SEM microscopy showed welded particles in control powder, however fractured surfaces were observed in treated sample. In FT-IR spectra, new peak at 685 cm-1 was observed after biofield treatment as compared to control that might be due to alteration in bonding properties in treated brass sample. These findings suggest that the biofield treatment has significantly altered the physical and structural properties of brass powder.
Identification of molecular quantum states using phase-sensitive forces
Creators: name: Najafian, Kaveh
name: Meir, Ziv
name: Sinhal, Mudit
name: Willitsch, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Quantum-logic techniques used to manipulate quantum systems are now increasingly being applied to molecules. Previous experiments on single trapped diatomic species have enabled state detection with excellent fidelities and highly precise spectroscopic measurements. However, for complex molecules with a dense energy-level structure improved methods are necessary. Here, we demonstrate an enhanced quantum protocol for molecular state detection using state-dependent forces. Our approach is based on interfering a reference and a signal force applied to a single atomic and molecular ion, respectively, in order to extract their relative phase. We use this phase information to identify states embedded in a dense molecular energy-level structure and to monitor state-to-state inelastic scattering processes. This method can also be used to exclude a large number of states in a single measurement when the initial state preparation is imperfect and information on the molecular properties is incomplete. While the present experiments focus on N$_2^+$, the method is general and is expected to be of particular benefit for polyatomic systems.
The Nyström method for convex loss functions
Creators: name: Della Vecchia, Andrea
name: De Vito, Ernesto
name: Mourtada, Jaouad
name: Rosasco, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We investigate an extension of classical empirical risk minimization, where the hypothesis space consists of a random subspace within a given Hilbert space. Specifically, we examine the Nyström method where the subspaces are defined by a random subset of the data. This approach recovers Nyström approximations used in kernel methods as a specific case. Using random subspaces naturally leads to computational advantages, but a key question is whether it compromises the learning accuracy. Recently, the tradeoffs between statistics and computation have been explored for the square loss and self-concordant losses, such as the logistic loss. In this paper, we extend these analyses to general convex Lipschitz losses, which may lack smoothness, such as the hinge loss used in support vector machines. Our main results show the existence of various scenarios where computational gains can be achieved without sacrificing learning performance. When specialized to smooth loss functions, our analysis recovers most previous results. Moreover, it allows to consider classification problems and translate the surrogate risk bounds into classification error bounds. Indeed, this gives the opportunity to compare the effect of Nyström approximations when combined with different loss functions such as the hinge or the square loss.
Proceedings of the 2019 Connected Learning Summit
Creators: name: Kalir, Jeremiah
name: Filipiak, Danielle
Publisher: name: Carnegie Mellon University
Year: 2024
Subjects: classificationCode: 330310
subject: Interaction and experience design
classificationCode: 390405
subject: Educational technology and computing
classificationCode: 470102
subject: Communication technology and digital media studies

description: The Proceedings of the 2019 Connected Learning Summit features research and presentations from the 2019 Connected Learning Summit, held at the University of California, Irvine in October 2019. The proceedings includes full research papers and abstracts for all other presentations.
Korneichuk-Stechkin Lemma, Ostrowski and Landau inequalities, and optimal recovery problems for $L$-space Valued Functions
Creators: name: Babenko, Vladyslav
name: Babenko, Vira
name: Kovalenko, Oleg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 41A65, 41A17, 46E40, 41A44

description: We prove an analogue of the Korneichuk--Stechkin lemma for functions with values in $L$-spaces. As applications, we obtain sharp Ostrowski type inequalities and solve problems of optimal recovery of identity and convexifying operators, as well as the problem of integral recovery, on the classes of $L$-space valued functions with given majorant of modulus of continuity. The recovery is done based on $n$ mean values of the functions over some intervals. Moreover, on the classes of functions with given majorant of modulus of continuity of their Hukuhara type derivative, we solve the problem of optimal recovery of the function and the Hukuhara type derivative. The recovery is done based on $n$ values of the function. We also obtain some sharp Landau type inequalities and solve an analogue of the Stechkin problem about approximation of unbounded operators by bounded ones and the problem of optimal recovery of an unbounded operator on a class of elements, known with error. Consideration of $L$-space valued functions gives a unified approach to solution of the mentioned above extremal problems for the classes of multi- and fuzzy-valued functions as well as for the classes of functions with values in Banach spaces, in particular random processes, and many other classes of functions.
Conductivité thermique d'une céramique affectée par un réseau de fissures localisées aux joints de granulats : simulations 2D de l'effet d'une distribution bimodale de taille de granulats
Creators: name: Moutin, Léo
name: Masson, Renaud
name: Duguay, Christelle
name: Bouineau, Vincent
name: Fayette, Laurent
name: Adenot, Frédéric
name: Josien, Marc
name: Bornert, Michel
Publisher: name: Société Française de Thermique
Year: 2022
Subjects: Céramiques poreuses
UO2
caractérisation
simulation
modélisation

description: Les matériaux céramiques obtenus par frittage présentent une porosité qui peut être plus ou moins marquée et dont les caractéristiques morphologiques varient fortement d'un matériau à l'autre. Cette porosité peut avoir une forte influence sur leur comportement thermique en dégradant leur conductivité thermique. Il est alors important de comprendre précisément le rôle que joue cette porosité sur le comportement thermique de ces matériaux. Les matériaux étudiés sont des céramiques de dioxyde d'Uranium (UO2) susceptibles de présenter un réseau de porosité très développé à l'issu du frittage. Pour les céramiques caractérisées ici, ce réseau se particularise par la présence d'une porosité de forme fine et allongée qui peut être assimilée à un réseau de fissures. Cette porosité est appelée porosité "filamentaire" en référence à sa forme. Un modèle numérique a été développé pour évaluer l'influence de la porosité de céramiques UO2 sur leur comportement thermique. Ce modèle repose sur des simulations numériques par champs complets (méthode FFT) réalisées sur des microstructures synthétiques. Pour que le modèle prédise correctement la conductivité thermique de ces céramiques, il est essentiel que les microstructures synthétiques soient fidèles aux microstructures des céramiques étudiées. Par rapport aux microstructures synthétiques de référence, présentées dans des travaux antérieurs, de nouvelles considérations sont faites. Sont notamment étudiés, la possibilité de considérer une distribution bimodale de taille de granulats ainsi qu'une orientation préférentielle de la porosité. L'influence de ces deux ingrédients sur les paramètres morphologiques des microstructures sont ensuite évalués en comparant les résultats obtenus par caractérisation sur ces microstructures à ceux obtenus sur les microstructures de référence et sur les microstructures des céramiques étudiées. L'influence d'une distribution bimodale de taille de granulats et d'une orientation préférentielle de la porosité sur le comportement thermique des différentes microstructures est également évalué en réalisant des simulations numériques 2D (méthode FFT) sur des coupes des microstructures. Les simulations thermiques caractérisent ainsi le comportement de microstructures virtuelles présentant des fissures rubans (infinies dans la direction opposée au plan d'observation), ce qui exacerbe l'effet de ces fissures sur les propriétés thermiques simulées.
Japan and the West: Exploration and Inspiration
Creators: name: Wyatt, Nick
Publisher: name: Science Museum Group
Year: 1998
Subjects: technology
trade
Japan
exhibition
Europe
Tokugawa Yoshimune
medicine

description: Until 1853 Japan existed in virtual isolation. The earliest contacts came with European traders and missionaries. After 1639 the Dutch were the only Europeans allowed to trade with Japan. However contacts between the Dutch and Japanese were extremely limited. Various physicians working for the Dutch carried out important scientific work on Japanese wildlife and mapped the islands. During the eighteenth century controls were relaxed and an increasing number of scientific books and instruments were imported. When innovations to native technology happened, they were on a small-scale and constrained by social and economic factors. Western technologies were sometimes adapted for local circumstances. This catalogue documents the exhibition in the Science Museum Library from 24 June to 26 August 1998.
Ébullition en film sous flux solaire concentré
Creators: name: Lorfing, Dylan
name: Falcoz, Quentin
name: Ahmadi, Aras
name: Olivès, Régis
Publisher: name: Société Française de Thermique
Year: 2022
Subjects: Ebullition
solaire concentré
dessalement

description: Le dessalement de l'eau de mer pour un approvisionnement en eau potable sécurisé fait partie des enjeux majeurs pour bon nombre de pays. Aussi, l'intégration des énergies bas-carbone dans les procédés de dessalement devient crucial. C'est ainsi que de plus en plus d'études portent sur la conception d'éco-procédé de dessalement de l'eau de mer utilisant, en particulier, l'énergie solaire. Nous avons proposé un système basé sur la génération de vapeur d'eau par ébullition de l'eau saumâtre à partir du rayonnement solaire concentré. Il s'est agi de définir les conditions opératoires et la configuration géométrique adaptées à ce nouveau type de procédé. Dans le cadre de cette étude, un dispositif expérimental original a été mis en œuvre afin d'étudier les régimes d'ébullition sous flux solaire concentré. Il a été montré que le régime d'ébullition en film permettait de maintenir la surface d'évaporation propre, exempte de dépôt. Or le dépôt de sel et de calcaire constitue un verrou technologique majeur dans le développement des procédés de dessalement par voie thermique. Des expériences sont donc réalisées à l'aide de ce dispositif pour étudier le régime d'ébullition en film et donc de définir les conditions opératoires pour assurer le bon fonctionnement de l'évaporateur. Une étude théorique conduit à identifier, en particulier, le coefficient d'échange thermique en ébullition en film dans une géométrie conique et à déterminer une corrélation semi-empirique comparable à celle de Rohsenow et al.. Les performances thermiques du système récepteur-générateur de vapeur sont alors évaluées en fonction de ses propriétés thermiques et géométriques. L'efficacité thermique obtenue est de 82 \% ; elle est comparée à celle obtenue en régime nucléée qui est de 89 \%. Certes l'ébullition en film a une efficacité plus faible, mais elle comporte l'avantage, par rapport à l'ébullition nucléé, de préserver la surface d'évaporation du dépôt de calcaire et de sel et ainsi réduire les coûts d'entretien.
Spherical collapse in reconstructed dark energy models
Creators: name: Mukherjee, Ankan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The present work deals with the spherical collapse of matter overdensity for two reconstructed dark energy models. One of the models is reconstructed from parametrization of effective or total equation of state of energy components in the universe ($w_{eff}$ model) and the other model is the constant dark energy equation of state model, namely the $w$CDM model. The linear and nonlinear evolution of matter density contrast are studied for the present models. It is observed that the linear and even the nonlinear evolutions of density contract are almost indistinguishable in these two models. The critical density contrast at collapse as a function of redshift is also studied. The nature of critical density contrast is also found to be degenerate in the present models. Further the number count of collapsed objects or dark matter halos along redshift are also studied. Two different halo mass functions, namely the Press-Schechter mass function and the Sheth-Tormen mass function, are adopted in this context. It is observed that for both the mass functions the $w_{eff}$ model has slightly higher number of halos at very low redshift ($z<0.5$) and at higher redshift the $w$CDM model has higher number of dark matter halos. On the other hand, it is observed that the Press-Schechter mass function produces slightly higher number of dark matter halos at low redshift compared to Sheth-Torman mass function and the number of halos is higher for Sheth-Torman mass function at redshift $z>0.9$ for both the dark energy models. The results clearly show that these two highly degenerate dark energy models are distinguishable in the study of spherical collapse and galaxy cluster number counts.
description: 20 pages, 9 figures
Fractal Measures of Sea, Lake, Strait, and Dam-Reserve Shores: Calculation, Differentiation, and Interpretation
Creators: name: Yilmazer, D.
name: Berker, A. N.
name: Yilmaz, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geophysics (physics.geo-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The fractal dimensions d_f of the shore lines of the Mediterranean, the Aegean, the Black Sea, the Bosphorus Straits (on both the Asian and European sides), the Van Lake, and the lake formed by the Ataturk Dam have been calculated. Important distinctions have been found and explained.
description: Published version, 3 pages, 2 figures, 1 table
Correlation between field-test and laboratory results for a Proton Exchange Membrane Fuel Cell (PEMFC) used as a residential cogeneration system
Creators: name: Paulus, Nicolas
name: Davila, Camila
name: Lemort, Vincent
Publisher: name: Société Française de Thermique
Year: 2022
Subjects: PEMFC
field-test
modelling
in-situ
monitoring
laboratory

description: In the much-needed energy transition, focus is often brought to hydrogen and Fuel cells applications. This is even the case at a residential level as FC fed by natural gas (methane) are already commercialised as micro-combined heat and power (micro-CHP) units. One of the latter systems, investigated in this study, is a PEMFC-gas boiler hybrid system, fed by natural gas, designed to provide all the heat demands of residential houses and to participate locally in the electrical production. Thanks to high integration levels, it combines the same PEMFC of nominal constant power of 0.75kWel and 1.1kWth with the same 220L DHW (Domestic Hot Water) tank. The gas boiler, mainly used for peak heat demands, is able to condense and is designed to provide up to 30.8kWth of thermal power. In previous work, this machine has been studied thanks to in-situ monitoring data in two houses in Belgium for the whole year 2020. Recently, an empirical polynomial model of the machine for daily efficiencies (electrical and thermal) has been established based on the energy demands of the building. It is mainly based on the DHW and space heating demands but it also considers the daily electrical production that can be achieved by the machine. This model has been chosen because it showed a quite satisfying goodness of fit for all the field-test results, whatever the house and the season considered. This machine has also been acquired and tested in the facilities of the University of Liege for quite exhaustive testing. The results this work is based upon are the one conducted in steady-state operating conditions are resumed in this paper. Lab testing steady-states studies and real field-test applications are usually very different because the operating conditions seen in practice are very specific to the installation, the climate and the behavior of the occupants. Despite that, this work's purpose is to study how a correlation between field-test real results and steady-state lab results can still be conducted and how both studies can fit with one another.
BY-COVID - WP5 - Baseline Use Case: SARS-CoV-2 vaccine effectiveness assessment - Local outputs and comparative analysis
Creators: name: Meurisse, Marjan
name: Estupiñán-Romero, Francisco
name: Van Goethem, Nina
name: Perola, Markus
name: Paajanen, Teemu
name: Bernal-Delgado, Enrique
Publisher: name: Zenodo
Year: 2024
Subjects: COVID-19
Comparative effectiveness
International comparison
Causal inference
SARS-CoV-2

description: This publication corresponds to the local outputs and comparative analysis of the Baseline Use Case proposed in T.5.2 (WP5) in the BY-COVID project on “SARS-CoV-2 Vaccine effectiveness in preventing SARS-CoV-2 infection.”

Research question: "How effective have the SARS-CoV-2 vaccination programmes been in preventing SARS-CoV-2 infections?”

Study design: An observational retrospective longitudinal (cohort) study using routinely collected population, health and care data from several countries/regions in Europe. We have designed the observational study to emulate a hypothetical Target Trial (TT) of the causal effect of SARS-CoV-2 vaccination programs in preventing SARS-CoV-2 infections.

A federated analysis approach was adopted, with the secured distributed deployment of the interoperable analytical pipeline by different Participant Nodes (i.e., institutions hosting or having access to the required individual-level data). A detailed description of the data processing procedures and the security measures within the Secured Processing Environments (SPE) of each of the Participant Nodes is provided in the published Data Management Plan (DMP). For more details on the methodological approach, see here. 

The local outputs correspond with the interactive reports of each main step of the analytical pipeline described in 'Methods analytical pipeline' and an excel file used as input for the comparative analysis. They have been produced using real-world data from public health and the national health system in Aragon (Spain), Brussels and Wallonia (Belgium), and Finland. 

The scripts implementing the statistical analyses in the analytical pipeline are available on GitHub, with additional documentation supporting the development and implementation of the baseline use case. 

Files included in this publication: 

Local outputs produced by each Participant Node: 6 interactive HTML reports (Human-readable, interactive report) + 1 XLSX file (Human-readable, Excel)

Aragon v.1.0.0

Brussels-Wallonia v.1.0.0

Finland v.1.0.0 

Comparative analysis: 

SARS-CoV-2 vaccine effectiveness comparative analysis results v.1.0.0 (HTML) - Interactive report

SARS-CoV-2 vaccine effectiveness comparative analysis execution script v.1.0.0 (QMD) - Quarto RMarkdown script to execute the comparative analysis and produce the interactive report
description: The contents of this document are the sole responsibility of their authors. All rights reserved. Copying and distribution by any means is permitted provided that the authors are acknowledged, that no commercial use is made of the works and that no modifications are made (CC-BY INT 4.0.).
Scalable multiphoton generation from cavity-synchronized single-photon sources
Creators: name: Li, Ming
name: García-Ripoll, Juan José
name: Ramos, Tomás
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose an efficient, scalable, and deterministic scheme to generate multiple indistinguishable photons over independent channels, on demand. Our design relies on multiple single-photon sources, each coupled to a waveguide, and all of them interact with a common cavity mode. The cavity synchronizes and triggers the simultaneous emission of one photon by each source, which are collected by the waveguides. For a state-of-the-art circuit QED implementation, this scheme supports the creation of single photons with purity, indistinguishability, and efficiency of $99\%$ at rates of $\sim $MHz. We also discuss conditions to produce up to 100 photons simultaneously with generation rates of hundreds of kHz. This is orders of magnitude more efficient than previous demultiplexed sources for boson sampling and enables the realization of deterministic multi-photon sources and scalable quantum information processing with photons.
description: Updated Version. 27 pages = 16 (main text) + 6 (appendices) + 5 (references). 10 Figures. Comments are welcome
Tensor Radiomics : Applications of Multi-Quantized Features to Oncologic PET/CT Images
Creators: name: Dubljevic, Natalia
Publisher: name: The University of British Columbia
Year: 2022

description: Radiomics is a term that refers to the extraction of features that provide quantitative information from medical images. These radiomics features capture information about tissues and lesions such as shape and heterogeneity. They act as imaging biomarkers, have been shown to have the ability to predict the biological characteristics of lesions, and can assess patient prognosis or response to treatment. However, determining features with high predictive power and robustness is a difficult task. It is hypothesized that utilizing features calculated under a range of perturbations may provide improved predictive power. This allows the predictive model access to a large range of features of which the most beneficial may be leveraged. Furthermore, new information may be introduced by the change of a feature under a given parameter. This approach is referred to as ‘tensor radiomics’. Three implementations given the task of predicting head and neck cancer patient outcome were tested using discretization bin sizes as the varying parameter. Initial results are inconclusive, and further experimentation is required to give a comprehensive assessment of tensor radiomics.
Is Q-Learning Minimax Optimal? A Tight Sample Complexity Analysis
Creators: name: Li, Gen
name: Cai, Changxiao
name: Chen, Yuxin
name: Wei, Yuting
name: Chi, Yuejie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Q-learning, which seeks to learn the optimal Q-function of a Markov decision process (MDP) in a model-free fashion, lies at the heart of reinforcement learning. When it comes to the synchronous setting (such that independent samples for all state-action pairs are drawn from a generative model in each iteration), substantial progress has been made towards understanding the sample efficiency of Q-learning. Consider a $γ$-discounted infinite-horizon MDP with state space $\mathcal{S}$ and action space $\mathcal{A}$: to yield an entrywise $\varepsilon$-approximation of the optimal Q-function, state-of-the-art theory for Q-learning requires a sample size exceeding the order of $\frac{|\mathcal{S}||\mathcal{A}|}{(1-γ)^5\varepsilon^{2}}$, which fails to match existing minimax lower bounds. This gives rise to natural questions: what is the sharp sample complexity of Q-learning? Is Q-learning provably sub-optimal? This paper addresses these questions for the synchronous setting: (1) when $|\mathcal{A}|=1$ (so that Q-learning reduces to TD learning), we prove that the sample complexity of TD learning is minimax optimal and scales as $\frac{|\mathcal{S}|}{(1-γ)^3\varepsilon^2}$ (up to log factor); (2) when $|\mathcal{A}|\geq 2$, we settle the sample complexity of Q-learning to be on the order of $\frac{|\mathcal{S}||\mathcal{A}|}{(1-γ)^4\varepsilon^2}$ (up to log factor). Our theory unveils the strict sub-optimality of Q-learning when $|\mathcal{A}|\geq 2$, and rigorizes the negative impact of over-estimation in Q-learning. Finally, we extend our analysis to accommodate asynchronous Q-learning (i.e., the case with Markovian samples), sharpening the horizon dependency of its sample complexity to be $\frac{1}{(1-γ)^4}$.
description: accepted to Operations Research
C. G. Peterson Jr to T. Bayles Minuse, June 5, 1956
Creators: name: Peterson, C. G.
Publisher: name: Unknown
Year: 1956
Subjects: Stony Brook
Concert halls
Concerts
Amphitheaters
Correspondence
Music festivals
Rain
Insurance

description: This letter is written by C. G. Peterson tp T. Bayles Minuse on June 5, 1956, in regards to the rain insurance policy and they could proceed if rain became a factor in future performances.
Automated Mapping of Vulnerability Advisories onto their Fix Commits in Open Source Repositories
Creators: name: Hommersom, Daan
name: Sabetta, Antonino
name: Coppola, Bonaventura
name: Di Nucci, Dario
name: Tamburri, Damian A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The lack of comprehensive sources of accurate vulnerability data represents a critical obstacle to studying and understanding software vulnerabilities (and their corrections). In this paper, we present an approach that combines heuristics stemming from practical experience and machine-learning (ML) - specifically, natural language processing (NLP) - to address this problem. Our method consists of three phases. First, an advisory record containing key information about a vulnerability is extracted from an advisory (expressed in natural language). Second, using heuristics, a subset of candidate fix commits is obtained from the source code repository of the affected project by filtering out commits that are known to be irrelevant for the task at hand. Finally, for each such candidate commit, our method builds a numerical feature vector reflecting the characteristics of the commit that are relevant to predicting its match with the advisory at hand. The feature vectors are then exploited for building a final ranked list of candidate fixing commits. The score attributed by the ML model to each feature is kept visible to the users, allowing them to interpret the predictions.
 We evaluated our approach using a prototype implementation named FixFinder on a manually curated data set that comprises 2,391 known fix commits corresponding to 1,248 public vulnerability advisories. When considering the top-10 commits in the ranked results, our implementation could successfully identify at least one fix commit for up to 84.03% of the vulnerabilities (with a fix commit on the first position for 65.06% of the vulnerabilities). In conclusion, our method reduces considerably the effort needed to search OSS repositories for the commits that fix known vulnerabilities.
Challenges and Recommendations for Steel H-Piles Driven in Soft Rock
Creators: name: K. Ng And T. Sullivan
Publisher: name: Southeast Asian Geotechnical Society
Year: 2017
Subjects: Pile
LRFD
Rock
WEAP
CAPWAP

description: The Geotechnical Engineering Journal of the SEAGS & AGSSEA, 48, 3, 1-11.
On the number of representations of integers as differences between Piatetski-Shapiro numbers
Creators: name: Yoshida, Yuuya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 11D85 11D04 11D72, Secondary 11B30 11B25 37A44

description: For $α>1$, set $β=1/(α-1)$. We show that, for every $1<α<(\sqrt{21}+4)/5\approx1.717$, the number of pairs $(m,n)$ of positive integers with $d=\lfloor{n^α}\rfloor - \lfloor{m^α}\rfloor$ is equal to $βα^{-β}ζ(β)d^{β-1} + o(d^{β-1})$ as $d\to\infty$, where $ζ$ denotes the Riemann zeta function. We use this result to derive an asymptotic formula for the number of triplets $(l,m,n)$ of positive integers such that $l
description: 29 pages; modified the first paragraph of the proof of Theorem 1.3 and revised Section 1 slightly
Supplementary document for Thermal and mechanical THz modulation of flexible all-dielectric metamaterial - 6196759.pdf
Creators: name: Huang, Wanxia
name: Peng, Shan
name: Lu, Xueguang
name: Tang, Lu
name: Chang, Xue
name: Yan, Jiazhen
name: shi, qiwu
name: Chen, Kefan
name: Li, Jiang
name: Du, Liang-Hui
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: Thermal and mechanical THz modulation of flexible all-dielectric metamaterial: supplemental document
Analysis of Normal-Form Algorithms for Solving Systems of Polynomial Equations
Creators: name: Parkinson, Suzanna
name: Ringer, Hayden
name: Wall, Kate
name: Parkinson, Erik
name: Erekson, Lukas
name: Christensen, Daniel
name: Jarvis, Tyler J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65H04

description: We examine several of the normal-form multivariate polynomial rootfinding methods of Telen, Mourrain, and Van Barel and some variants of those methods. We analyze the performance of these variants in terms of their asymptotic temporal complexity as well as speed and accuracy on a wide range of numerical experiments. All variants of the algorithm are problematic for systems in which many roots are very close together. We analyze performance on one such system in detail, namely the 'devastating example' that Noferini and Townsend used to demonstrate instability of resultant-based methods.
description: Associated code available at https://github.com/tylerjarvis/eigen_rootfinding
Potential Impact of BioField Treatment on Atomic and Physical Characteristics of Magnesium
Creators: name: Trivedi, Mahendra
Publisher: name: SMN - The ScienceMedia Network
Year: 2016
Subjects: Natural Sciences
Chemistry

description: Magnesium (Mg), present in every cell of all living organisms, is an essential nutrient and primarily responsible for catalytic reaction of over 300 enzymes. The aim of present study was to evaluate the effect of biofield treatment on atomic and physical properties of magnesium powder. Magnesium powder was divided into two parts denoted as control and treatment. Control part was remained as untreated and treatment part received biofield treatment. Both control and treated magnesium samples were characterized using X-ray diffraction (XRD), surface area and particle size analyzer. XRD data showed that biofield treatment has altered the lattice parameter, unit cell volume, density, atomic weight, and nuclear charge per unit volume of treated magnesium powder, as compared to control. In addition, the crystallite size of treated magnesium was significantly reduced up to 16.70, 16.70, and 28.59% on day 7, 41 and 63 respectively as compared to control. Besides this, the surface area of treated magnesium powder was increased by 36.5 and 10.72% on day 6 and 72 respectively, whereas it was reduced by 32.77% on day 92 as compared to control. In addition, biofield treatment has also altered the particle sizes d10, d50, and d99 (size, below which 10, 50, and 99% particles were present, respectively) as compared to control. Overall, data suggest that biofield treatment has substantially altered the atomic and physical properties of treated magnesium powder.
Spectroscopic Characterization of Biofield Treated Metronidazole and Tinidazole
Creators: name: Trivedi, Mahendra
Publisher: name: SMN - The ScienceMedia Network
Year: 2016
Subjects: Natural Sciences
Chemistry

description: Metronidazole and tinidazole are widely used antimicrobial drugs against Gram-negative and Gram-positive anaerobic bacteria. The present study was aimed to evaluate the impact of biofield treatment on metronidazole and tinidazole using FT-IR and UV spectroscopy. The study was carried out in two groups i.e. control and treatment. Treatment groups were subjected to Mr. Trivedi’s biofield treatment while no treatment was given to control group. FT-IR spectrum of treated metronidazole showed the impact of biofield treatment on frequency of characteristic functional groups such as C=C (imidazole ring) stretching was appeared at lower frequency i.e. from 1600 cm-1 to 1553 cm-1. Likewise, NO2 asymmetric stretching and C-N symmetric stretching were appeared at higher wave number i.e. 1479 cm-1 to 1501 cm-1 and 1070 cm-1 to 1077 cm-1, respectively. FT-IR spectrum of tinidazole showed shifting in absorption peak of C-N stretching to higher wavenumber from 1002 cm-1 (control) to 1022 cm-1. The wavenumber of aromatic C=C bond (in imidazole) was shifted to lower frequency, which could be due to increases in conjugation effect. Further, increases in wavenumber of NO2 and C-N in treated sample suggested the increased force constant and bond strength as compared to control. Because of higher conjugation effect and increased bond strength, the molecule supposed to be more stable. The UV spectra of both metronidazole and tinidazole showed the similar patterns of lambda max (λmax) with respect to their control. The FT-IR results of both drugs suggest that there was an impact of biofield treatment on atomic level of metronidazole and tinidazole, as compared to control.
Inference for Heteroskedastic PCA with Missing Data
Creators: name: Yan, Yuling
name: Chen, Yuxin
name: Fan, Jianqing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistics Theory (math.ST)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper studies how to construct confidence regions for principal component analysis (PCA) in high dimension, a problem that has been vastly under-explored. While computing measures of uncertainty for nonlinear/nonconvex estimators is in general difficult in high dimension, the challenge is further compounded by the prevalent presence of missing data and heteroskedastic noise. We propose a novel approach to performing valid inference on the principal subspace under a spiked covariance model with missing data, on the basis of an estimator called HeteroPCA (Zhang et al., 2022). We develop non-asymptotic distributional guarantees for HeteroPCA, and demonstrate how these can be invoked to compute both confidence regions for the principal subspace and entrywise confidence intervals for the spiked covariance matrix. Our inference procedures are fully data-driven and adaptive to heteroskedastic random noise, without requiring prior knowledge about the noise levels.
description: accepted to Annals of Statistics
Effect of sodium oxide on structure of lanthanum aluminosilicate glass
Creators: name: Mabrouk, Assia
name: Bachar, Ahmed
name: Vaills, Yann
name: Canizarès, Aurélien
name: HAMPSHIRE, STUART
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 40
subject: Engineering

description: Abstract: Rare earth (RE) aluminosilicate glasses exhibit several favorable chemical, mechanical and thermal properties. As such, they are considered to be model systems for long-half-life actinides and are candidate containment materials for long-term immobilization of radioactive wastes. The aim of the present study was to investigate the effect of the substitution of sodium oxide on the glass transition temperature and structure of lanthanum aluminosilicate glasses. The primary objective was to elucidate the relationship between the substitution of Na2O for La2O3 on the Tg reduction and structural characteristics of lanthanum aluminosilicate glass, including identifying changes in the main Qn species and local environments of Si and Al. The structure of SiO2–Al2O3–La2O3–Na2O glasses has not been studied previously, and, thus, this investigation is the first to assess the structural changes occurring when La2O3 is substituted by Na2O. Three glasses were prepared with general composition (mol.%): 55SiO2–25Al2O3–20M2On (M = La or Na; n = 3 or 1). Glass G1 contains 20 mol.% La2O3 ; in G2, 15 mol.% of La2O3 was substituted by 15 mol.% Na2O; and Glass G3 contains 20 mol.% Na2O. The glasses were characterized by DSC to determine glass transition temperatures. As expected, as Na is substituted for La, Tg decreases substantially. Structural studies were carried out by FTIR spectroscopy, 29Si, and 27Al MAS NMR. As Na is substituted for La in these aluminosilicate glasses, the main goals that were achieved were the identification of Qn species and also changes in the local environments of Si and Al: {Qn Si(mAl)} and {Qn Al(mSi)}.
Introduzione
Creators: name: Capra, Andrea
name: Torre, Chiara
Publisher: name: ACME
Year: 2016

description: «Tante volte si è insistito sull’equivoco ragionamento per cui, essendo il gioco altra cosa dal serio, studiare il gioco non è cosa seria, tagliando così via una fetta di storia sociale decisamente “pesante”. È un equivoco che peraltro va lentamente sgretolandosi. Il concetto stesso di ludicità come dimensione ineliminabile del vivere collettivo comincia ad essere accettato e gira fra gli addetti ai lavori ormai a livello internazionale»: con queste parole Gherardo Ortalli, uno dei massimi esperti viventi di storia sociale del gioco, inaugurava in Statale, nel 2011, i lavori di una Giornata di Studi dedicata a Il gioco e i giochi nel mondo antico, tra cultura materiale e immateriale, organizzata da alcuni ricercatori di quello che allora era il Dipartimento di Scienze dell’Antichità, nell’ambito di un progetto interdisciplinare avviato nel 2009 e tuttora in corso.
description: ACME, Vol 69, No 1 (2016)