cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A first assessment of nitrogen sources and biogeochemical processing in the speleothem record
Creators: name: Ambler, Scott
Publisher: name: Lancaster University
Year: 2020

description: The most common groundwater contaminant is nitrogen, which presents a threat both to human health and the wider environment. Karstic aquifers are particularly vulnerable to contamination. As up to 25% of the world’s population is reliant on karst groundwater as their source of potable drinking water, quantifying this nitrogen contamination is important for human health. Use of nitrate δ15N and δ18O to determine sources of nitrogen contamination is well established in the literature. ‘Legacy N’ – the poorly understood storage of nitrogen in the vadose zone - has been established through extensive groundwater modelling. However, there are very few reliable historic archives of nitrogen groundwater contamination that would assist in quantifying this nitrogen storage capacity. This project proposes the use of speleothem archives of nitrogen to create an historic record of nitrogen groundwater contamination. Contemporary cave monitoring of Cueva-Cubío del Llanío in the Cantabria region of Northern Spain was undertaken to determine cave dynamics has classified the basic karst hydrology, cave ventilation and cave water chemistry that influence speleothem growth and the proxies preserved within the speleothem calcite. Nitrogen concentrations and isotopes in the major components of the nitrogen biogeochemical cycle were used to quantify the cycling of nitrogen through overlying environment and the impact on cave nitrogen. This included work on speleothem material. Cueva-Cubío del Llanío was found to have a complex ventilation regime, with side chambers removed from the main density driven airflow. Drips were found to be a combination ofmatrix and fracture-fed flow, with drips in shallower chambers drying up during summer months. Seasonality was present in nitrogen concentrations within the cave waters, though was absent in isotope values, suggesting an as-yet-unidentified non-fractionating cause. A promising record of nitrogen has been preserved in the Cueva-Cubío del Llanío speleothem archive. The first successful extraction of speleothem nitrate isotopes was completed, with multiple speleothems from around the world all recording differing nitrate isotope compositions, and interpreted as reflection of nitrogen dynamics in the overlying environment. The record of nitrogen dynamics within speleothems establishes the potential for an historic record of groundwater nitrogen.
Etude des possibles biais influant sur les mesures par capteur capacitif noyé
Creators: name: Ibrahim, Houssein
name: Villain, Géraldine
name: Palma Lopes, Sérgio
name: Ranaivomanana, Narintsoa
name: Balayssac, Jean-Paul
name: Dérobert, Xavier
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Dans le cadre du projet ANR-SCaNING, il s’agit de développer des capteurs capacitifs, résistifs et ultrasonores, intrusifs mais non destructifs à noyer dans des structures en béton armé afin de déterminer des indicateurs de durabilité et de suivi de dégradation. Dans nos travaux faisant partie de ce projet, il s’agit de concevoir un capteur capacitif noyé qui permettra de suivre la teneur en eau en mesurant la permittivité diélectrique au cours du temps. Comme toute mesure physique, la méthode capacitive est sensible à divers paramètres (environnementaux, instrumentaux…). On s’intéresse ici à analyser les possibles biais induits par l’action de ces paramètres sur les mesures capacitives. Dans un premier temps, une étude numérique a été réalisée en modélisant des électrodes fixées à deux montants en polychlorure de vinyle (PVC), le tout dans un volume de béton. L’étude montre l’influence des paramètres composant le montage expérimental (montants en PVC, vis…) sur la capacité simulée. Dans un second temps, un protocole expérimental a été mené dans le but de quantifier les effets capacitifs des câbles électriques reliant les électrodes au système de mesure capacitif nommé SyMeCC. Les résultats montrent l’influence de la longueur des câbles et mettent en relief le couplage électromagnétique généré qui varie en fonction de la longueur et de la distance entre les câbles.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Stochastic block model and exploratory analysis in signed networks
Creators: name: Jiang, Jonathan Q.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We propose a generalized stochastic block model to explore the mesoscopic structures in signed networks by grouping vertices that exhibit similar positive and negative connection profiles into the same cluster. In this model, the group memberships are viewed as hidden or unobserved quantities, and the connection patterns between groups are explicitly characterized by two block matrices, one for positive links and the other for negative links. By fitting the model to the observed network, we can not only extract various structural patterns existing in the network without prior knowledge, but also recognize what specific structures we obtained. Furthermore, the model parameters provide vital clues about the probabilities that each vertex belongs to different groups and the centrality of each vertex in its corresponding group. This information sheds light on the discovery of the networks' overlapping structures and the identification of two types of important vertices, which serve as the cores of each group and the bridges between different groups, respectively. Experiments on a series of synthetic and real-life networks show the effectiveness as well as the superiority of our model.
description: 12 pages, 8 figures, 2 tables. arXiv admin note: text overlap with arXiv:1110.1976 by other authors
The Concept of Force in Population Dynamics
Creators: name: Hayward, John
name: Roach, Paul A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Dynamical Systems (math.DS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The area of population dynamics has a rich history of the development and analysis of models of biological and social phenomena using ordinary differential equations. This paper describes a method for understanding the influence one variable exerts on another in such models as a force, with the relative effects of these forces providing a narrative explanation of the curvature in variable behaviour. Using the stock/flow form of a model, a symbolic notation is developed that identifies the forces with the causal pathways of the model's feedback loops. A force is measured by its impact, defined as the ratio of acceleration to rate of change, computed by differentiation along its associated pathway between variables. Different phases of force dominance are determined to enhance the standard stability analysis of the models, providing an explanation of model behaviour in Newtonian mechanical terms. The concepts developed are applied to well-known models from mathematical biology: the Spruce Budworm model, where force dominance identifies scenarios that give clarity to intervention points; and the Lotka-Volterra predator-prey model where the analysis highlights the importance of dissipative forces in achieving stability. Conclusions are drawn on the explanatory power of this approach, with suggestions made for future work.
description: 25 pages, 16 figures
Sur l’évaluation de la résistance réelle du béton de structure : Corrélation entre la méthode destructive et non-destructive (ultrasons)
Creators: name: Benidir, Adel
name: Debbakh, Said
name: Chaibedraa, Sihem
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cet article étudie l'influence des diamètres des carottes sur l'évaluation de la résistance à la compression réelle du béton. L'expérience consiste en la préparation de trois poteaux en béton armé et l'extraction de carottes pour effectuer des essais destructif et non destructif. Trois différents diamètres de carottes, 64, 79 et 103 mm, sont sélectionnés et l'extraction des carottes est effectuée sur trois différentes zones. Le même volume de béton est extrait de chaque zone. Le test non destructif traite la propagation des ondes élastiques et compressives en dérivant les vitesses de propagation des ultrasons. Les résultats montrent que l'évaluation de la résistance à la compression du béton dépend fortement des diamètres des carottes. De plus, la dérivation de la résistance à la compression réelle du béton en se référant aux résistances à la compression des carottes de diamètre de 64 mm montre une augmentation inattendue de la résistance caractéristique représentative. Par ailleurs, la corrélation entre l'évaluation de la résistance à la compression du béton basée sur les essais destructif et non destructif est également présentée.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Molecular dynamics simulations of tight junction proteins
Creators: name: Fitsiou, Eleni
Publisher: name: Lancaster University
Year: 2020

description: Tight junctions (TJs) are specialised cell-cell structures that serve primarily as a barrier to molecular transport through the intercellular space between the cells. The claudin family of proteins are the main structural and functional components of the TJ strands that circumscribe the cells. The detailed molecular organisation at the TJs is not entirely resolved, being relatively inaccessible by current experimental methods. Here, we have employed molecular dynamics simulations using both atomistic and coarse-grained models to investigate the TJ structure formed by claudin-1 using self-assembly coupled with free energy calculations and enhanced sampling techniques. A feature of the studies is that the self-assembly simulations have been carried out using atomistic detail (a first) by simulating only the extracellular domains of claudin-1 in an implied membrane. The results show that the cis-interaction can occur in the absence of trans-interacting partners and that a claudin dimer is the smallest stable unit. The dimers further form higher-order aggregates with a plethora of interacting dimeric interfaces. The transinteraction of claudins resulted in a compact structure with a minimal pore size confirming the barrier properties of claudin-1. The simulations also enabled the identification of the key regions of the claudin responsible for the trans-interaction, with the identified important amino acids being in agreement with experimental studies. The role of the lipid environment, with a focus on the skin lipids in the stratum granulosum, was also investigated, along with the effect of single-point mutations in claudin-1. The single-point mutation studies were consistent with experimental results. The simulation studies have enhanced our understanding of the assembly and structure of claudin-1 TJs, a notable finding being that kinetic locking is likely to be important in determining the TJ structure. The single-point mutation studies suggest that simulations could serve as screens towards defining potential gene-therapy strategies.
Determination of effective properties of concrete by Finite Element simulations for ultrasonic NDT
Creators: name: Dorval, Vincent
name: Imperiale, Alexandre
name: Demaldent, Edouard
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: ABSTRACT The ultrasonic testing of concretes is strongly affected by their inhomogeneous structure, which determines wave propagation velocities and causes attenuation. The work presented here aims at determining the effective properties of a concrete using time-domain Finite Element simulations. Numerical samples of concrete, represented as a mortar matrix containing aggregates, are randomly generated. The propagation of plane waves through these samples is simulated using Finite Elements for space discretization, and an explicit time scheme for time integration. The obtained ultrasonic field is processed to extract effective velocities and attenuations. The whole procedure has been implemented as new simulation modules in a development version of the CIVA platform. A module performing high-order Finite Element calculations in two dimensions had been the subject of a joint study between CEA and EDF. This communication introduces another tool, based on low-order computations on regular grids. It can perform two or three-dimensional calculations. These tools aim at providing input data for propagation calculations, and at validating analytical models. Cross-validation results obtained with the two approaches for two-dimensional configurations are presented. Results obtained with the low-order code in three dimensions are also shown. Theoretical results obtained with the Waterman and Truell model are included for comparison.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
A high-flux BEC source for mobile atom interferometers
Creators: name: Rudolph, Jan
name: Herr, Waldemar
name: Grzeschik, Christoph
name: Sternke, Tammo
name: Grote, Alexander
name: Popp, Manuel
name: Becker, Dennis
name: Müntinga, Hauke
name: Ahlers, Holger
name: Peters, Achim
name: Lämmerzahl, Claus
name: Sengstock, Klaus
name: Gaaloul, Naceur
name: Ertmer, Wolfgang
name: Rasel, Ernst M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum sensors based on coherent matter-waves are precise measurement devices whose ultimate accuracy is achieved with Bose-Einstein condensates (BEC) in extended free fall. This is ideally realized in microgravity environments such as drop towers, ballistic rockets and space platforms. However, the transition from lab-based BEC machines to robust and mobile sources with comparable performance is a challenging endeavor. Here we report on the realization of a miniaturized setup, generating a flux of $4 \times 10^5$ quantum degenerate $^{87}$Rb atoms every 1.6$\,$s. Ensembles of $1 \times 10^5$ atoms can be produced at a 1$\,$Hz rate. This is achieved by loading a cold atomic beam directly into a multi-layer atom chip that is designed for efficient transfer from laser-cooled to magnetically trapped clouds. The attained flux of degenerate atoms is on par with current lab-based BEC experiments while offering significantly higher repetition rates. Additionally, the flux is approaching those of current interferometers employing Raman-type velocity selection of laser-cooled atoms. The compact and robust design allows for mobile operation in a variety of demanding environments and paves the way for transportable high-precision quantum sensors.
description: 22 pages, 6 figures
D5.3 Final iNGENIOUS data management platform
Creators: name: Ciccone, Gino
name: Carpentieri, Giuseppina
name: Weinhold, Carsten
name: Bednarczyk, Marek
name: Puźniakowski, Tadeusz
name: Rodriguez Cerro, Cesar
name: Poikonen, Jussi
name: Tardo, Alexandr
name: Bizon, Ivo
name: Rojbi, Rania
name: Politis, Christos
name: Frontelo, Ignacio Benito
name: Sierra Garcia, Enrique
name: Bernini, Giacomo
name: Seder, Erin
Publisher: name: Zenodo
Year: 2023
Subjects: Smart IoT GW
IoT
DVL
Cross-DLTs
Smart application
Interoperable Layer
TrustOS
Predictive Analytics
Industrial Tactile applications
Secure Communication

description: This document describes the final solution of iNGENIOUS interoperable layer and gives a detailed technical description of how components coming from different existing and forthcoming IoT technologies are integrated.
Functional outlier detection by a local depth with application to NOx levels
Creators: name: Sguera, Carlo
name: Galeano, Pedro
name: Lillo, Rosa
Publisher: name: arXiv
Year: 2015
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: This paper proposes methods to detect outliers in functional data sets and the task of identifying atypical curves is carried out using the recently proposed kernelized functional spatial depth (KFSD). KFSD is a local depth that can be used to order the curves of a sample from the most to the least central, and since outliers are usually among the least central curves, we present a probabilistic result which allows to select a threshold value for KFSD such that curves with depth values lower than the threshold are detected as outliers. Based on this result, we propose three new outlier detection procedures. The results of a simulation study show that our proposals generally outperform a battery of competitors. We apply our procedures to a real data set consisting in daily curves of emission levels of nitrogen oxides (NOx) since it is of interest to identify abnormal NOx levels to take necessary environmental political actions.
description: in Stochastic Environmental Research and Risk Assessment, 2015
Monitoring du séchage de bétons au laitier par capteur noyé de résistivité en vue de l'estimation des propriétés de transport
Creators: name: Eid, Marie-Ange
name: Villain, Géraldine
name: Bonnet, Stéphanie
name: Palma Lopes, Sérgio
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Le travail présenté ci-dessous se déroule dans le cadre du projet ANR-DEMCOM, qui s’intéresse principalement aux ouvrages maritimes, dont certaines zones comme la zone de marnage sont parfois difficilement accessibles pour l’inspection. Pour cela, il est primordial d’adopter des techniques d’évaluation non-destructive adaptées à de tels ouvrages, notamment le capteur de résistivité noyé développé par [Badr et al., 2019] permettant de suivre des gradients de résistivité électrique, propriété du béton très sensible aux teneurs en eau et en chlorures. Dans ce qui suit, nous nous intéressons à suivre le séchage de deux bétons formulés avec et sans laitier, par l’intermédiaire du capteur noyé permettant de suivre l’évolution de la résistivité en fonction du temps et de la profondeur, et de remonter par la suite aux profils de teneur en eau. Les résultats expérimentaux nous ont permis de mettre en évidence l’effet de la température sur la résistivité du béton. De plus, ils ont permis non seulement de valider la capacité de ce capteur à suivre l’état hydrique du béton pendant la période de séchage, mais aussi à souligner l’influence de la présence du laitier sur la réponse du capteur ainsi que sur la cinétique du séchage.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Détection et suivi de l’endommagement mécanique du béton recyclé par émission acoustique
Creators: name: Hadjari, Mohammed
name: Dahou, Zohra
name: Marouf, Hafida
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Dance cette contribution, le processus de fissuration et suivi d’endommagement d’un béton recyclé est étudié en associant la technique d’émission acoustique. Trois bétons ont été formulés, un béton ordinaire et deux bétons recyclés. La composition des béton recyclés a été obtenue en substituant la masse de gravier naturel par 30% de gravier recyclé ; Le principal paramètre variable est la classe granulaire (4/8 et 8/16). Des essais de flexion 3 points piloté par émission acoustique sont conduits à 28 jours sur des éprouvettes prismatiques (10x10x40cm³) sur les trois types de bétons. Les résultats obtenus révèlent une relation entre la taille de la classe granulaire recyclé et les paramètres d'EA. En effet, le nombre de hits, le nombre d’évènements et les énergies d'EA augmentent avec l’augmentation de la taille de la classe granulaire recyclé.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Analysis of acoustic emission signals for the characterization of cracking of reinforced concrete T-beams
Creators: name: Mandal, Deba Datta
name: Bentahar, Mourad
name: El Mahi, Abderrahim
name: Brouste, Alexandre
name: El Guerjouma, Rachid
name: Montresor, Silvio
name: Cartiaux, François-Baptiste
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Acoustic emission (EA) has proven to be very suitable for detecting and monitoring cracking of materials and structures. EA signals can be analyzedeither based on physical considerations (geophysics/seismology) or using their temporal and frequency characteristics. However, the multitude ofdefinitions related to the different parameters as well as the treatment methods make it necessary to develop a comparative analysis in the case of aheterogeneous material such as civil concrete. To this end, this contribution aims to study the microcracking of reinforced concrete T-beamssubjected to quasi-static mechanical tests. To do this, four-point bending tests, carried out at different travel speeds, were carried out in the presence ofa network of acoustic emission sensors. A comparison between the damage susceptibility of three definitions corresponding to the parameter b-valuewas carried out and supplemented by the evolution of the RA value and the mean frequency (AF) as a function of loading time. This work also showsthe use of the support-vector machine (SVM) method to define different areas of damage in the load-displacement curve. This work shows the limitations of this approach and proposes the use of an unsupervised learning approach to group EA data according to physical parameters as well astime/frequency parameters. Finally, this work discusses the advantages and limitations of the different methods and parameters used in relation to the micro/macro mechanisms at the origin of concrete cracking.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
All about baryons: revisiting SIDM predictions at small halo masses
Creators: name: Fry, A. Bastidas
name: Governato, F.
name: Pontzen, A.
name: Quinn, T.
name: Tremmel, M.
name: Anderson, L.
name: Menon, H.
name: Brooks, A. M.
name: Wadsley, J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use cosmological hydrodynamic simulations to consistently compare the assembly of dwarf galaxies in both $Λ$ dominated, Cold (CDM) and Self--Interacting (SIDM) dark matter models. The SIDM model adopts a constant cross section of 2 $cm^{2}/g$, a relatively large value to maximize its effects. These are the first SIDM simulations that are combined with a description of stellar feedback that naturally drives potential fluctuations able to create dark matter cores. Remarkably, SIDM fails to significantly lower the central dark matter density at halo peak velocities V$_{max}$ $
description: 13 pages, 12 Figures, one Appendix, MNRAS in press. Two figures added in final version showing the simulated systems on the stellar mass halo mass relation and the SIDM vs CDM mass deficiency at a function of radius
Utilisation d'un accélérateur de particules pour la radiographie des ouvrages du génie civil en béton précontraint
Creators: name: Monange, Léa
name: Busson, David
name: Plassard, Florent
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cet article présente le retour d’expérience du projet Scorpion mené entre les années 1970 et 1995 par le Laboratoire Régional des Ponts et Chaussées de Blois. Ce projet a permis la radiographie de dizaines d’ouvrages d’art en béton précontraint. Le projet Scorpion a été arrêté au profit de la gammagraphie en 1995. Aujourd’hui, la dernière équipe de gammagraphie en France, présente au Cerema de Bron, étudie une méthode alternative à la gammagraphie, basée sur un accélérateur de particules, dans le but de remplacer les sources scellées. A la suite du retour d’expérience seront présentées les avancées des études actuellement conduites pour l’utilisation d’un accélérateur de particules pour la radiographie d’ouvrages d’art en béton précontraint.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Optomechanical Transduction and Characterization of a Silica Microsphere Pendulum via Evanescent Light
Creators: name: Madugani, Ramgopal
name: Yang, Yong
name: Ward, Jonathan M
name: Le, Vu H
name: Chormaic, Síle Nic
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Dissipative optomechanics has some advantages in cooling compared to the conventional dispersion dominated systems. Here, we study the optical response of a cantilever-like, silica, microsphere pendulum, evanescently coupled to a fiber taper. In a whispering gallery mode resonator the cavity mode and motion of the pendulum result in both dispersive and dissipative optomechanical interactions. This unique mechanism leads to an experimentally observable, asymmetric response function of the transduction spectrum which can be explained using coupled-mode theory. The optomechanical transduction, and its relationship to the external coupling gap, are investigated and we show that the experimental behavior is in good agreement with the theoretical predictions. A deep understanding of this mechanism is necessary to explore trapping and cooling in dissipative optomechanical systems.
description: 5 pages
Generalized parton distributions and transverse densities in a light-front quark-diquark model for the nucleons
Creators: name: Mondal, Chandan
name: Chakrabarti, Dipankar
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a study of the generalized parton distributions for the quarks in a proton in both momentum and position spaces using the light-front wave functions of a quark-diquark model for the nucleon predicted by the soft-wall model of AdS/QCD. The results are compared with the soft-wall AdS/QCD model of proton GPDs for zero skewness. We also calculate the GPDs for nonzero skewness. We observe that the GPDs have a diffraction pattern in longitudinal position space, as seen before in other models. Then we present a comparitive study of the nucleon charge and anomalous magnetization densities in the transverse plane. Flavor decompositions of the form factors and transverse densities are also discussed.
description: 19 figures; text modified
Sind wir auf dem Wege zu einer Gesellschaft von Süchtigen?
Creators: name: Schmidtobreick, Bernhard
name: Thamm, Berndt Georg
Publisher: name: Herder Korrespondenz
Year: 1970

description: Herder Korrespondenz, Bd. 34 Nr. 1 (1980): Herder Korrespondenz, Band 34, Heft 1
Spin excitations of a proximate Kitaev quantum spin liquid realized in Cu$_2$IrO$_3$
Creators: name: Takahashi, Sean K.
name: Wang, Jiaming
name: Arsenault, Alexandre
name: Abramchuk, Mykola
name: Tafti, Fazel
name: Singer, Philip M.
name: Imai, Takashi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic moments arranged at the corners of a honeycomb lattice are predicted to form a novel state of matter, Kitaev quantum spin liquid, under the influence of frustration effects between bond-dependent Ising interactions. Some layered honeycomb iridates and related materials, such as Na$_{2}$IrO$_{3}$ and $α$-RuCl$_{3}$, are proximate to Kitaev quantum spin liquid, but bosonic spin-wave excitations associated with undesirable antiferromagnetic long-range order mask the inherent properties of Kitaev Hamiltonian. Here, we use $^{63}$Cu nuclear quadrupole resonance to uncover the low energy spin excitations in the nearly ideal honeycomb lattice of effective spin $S = 1/2$ at the Ir$^{4+}$ sites in Cu$_{2}$IrO$_{3}$. We demonstrate that, unlike Na$_{2}$IrO$_{3}$, Ir spin fluctuations exhibit no evidence for critical slowing down toward magnetic long range order in zero external magnetic field. Moreover, the low energy spin excitation spectrum is dominated by a mode that has a large excitation gap comparable to the Ising interactions, a signature expected for Majorana fermions of Kitaev quantum spin liquid.
description: 18 figs
Formula validation in MediaWiki with TexVC
Creators: name: Stegmüller, Johannes
name: Schubotz, Moritz
Publisher: name: Zenodo
Year: 2022
Subjects: MediaWiki
Formula
Abstract Syntax Tree
Wikipedia
PHP

description: This presentation is about the implementation of TexVC in PHP for MediaWiki 1.40+ after RestBase has been deprecated. It also outlines the upcoming capabilities of TexVC to generate MathML.
Ballistic Josephson junctions in edge-contacted graphene
Creators: name: Calado, Victor E.
name: Goswami, Srijit
name: Nanda, Gaurav
name: Diez, Mathias
name: Akhmerov, Anton R.
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Klapwijk, Teun M.
name: Vandersypen, Lieven M. K.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hybrid graphene-superconductor devices have attracted much attention since the early days of graphene research. So far, these studies have been limited to the case of diffusive transport through graphene with poorly defined and modest quality graphene-superconductor interfaces, usually combined with small critical magnetic fields of the superconducting electrodes. Here we report graphene based Josephson junctions with one-dimensional edge contacts of Molybdenum Rhenium. The contacts exhibit a well defined, transparent interface to the graphene, have a critical magnetic field of 8 Tesla at 4 Kelvin and the graphene has a high quality due to its encapsulation in hexagonal boron nitride. This allows us to study and exploit graphene Josephson junctions in a new regime, characterized by ballistic transport. We find that the critical current oscillates with the carrier density due to phase coherent interference of the electrons and holes that carry the supercurrent caused by the formation of a Fabry-Pérot cavity. Furthermore, relatively large supercurrents are observed over unprecedented long distances of up to 1.5 $μ$m. Finally, in the quantum Hall regime we observe broken symmetry states while the contacts remain superconducting. These achievements open up new avenues to exploit the Dirac nature of graphene in interaction with the superconducting state.
description: Updated version after peer review. Includes supplementary material and ancillary file with source code for tight binding simulations
Evaluation de la performance d’une réparation ou comment le monitoring et l’auscultation viennent en appui des observations visuelles
Creators: name: Desbois, Tiffany
name: Thauvin, Benoit
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Comment peut-on évaluer la performance d’une réparation de béton armé dans le temps ? Cet article présente une expérimentation menée sur un quai sur pieux en béton armé présentant des désordres, notamment des fractures aux arêtes inférieures de la poutre, dus à la corrosion de ses aciers. Celui-ci a été réparé sur une moitié par une réparation qualifiée de lourde consistant en une purge supérieure à l’enrobage et la réalisation d’un béton projeté ; sur l’autre moitié elle consiste en une purge légère et la projection voie humide d’un mortier de réparation. En quelques emplacements de ces zones, une protection cathodique par courant galvanique a été intégrée en complément. Deux approches complémentaires ont été utilisées afin de suivre et d’évaluer la performance de ces réparations. La première consiste en du monitoring qui permet notamment à l’aide d’électrodes de référence de connaître en quelques points de l’ouvrage le potentiel des armatures. La deuxième comprend de l’auscultation depuis le parement, avec des mesures de potentiels et des mesures de résistivités. Un bilan 9 ans après les réparations permet de mettre en avant l’intérêt d’un tel suivi dans l’évaluation de leur performance. Ce retour d’expériences amène des pistes pour le déploiement de cette évaluation à d’autres projets de réparation.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Pharmacokinetic considerations in the treatment of hypertension in risperidone-medicated patients – thinking of clinically relevant CYP2D6 interactions
Creators: name: Paulzen, M.
name: Haen, Ekkehard
name: Stegmann, Benedikt
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: NEGATIVE SYMPTOMS; METABOLIC SYNDROME; DRUG-INTERACTIONS; SCHIZOPHRENIA; AMLODIPINE; METOPROLOL; CATIE; VARIABILITY; PREVALENCE; DISEASE; Therapeutic drug monitoring; risperidone; amlodipine; metoprolol; CYP2D6; interaction; pharmacokinetics
subject: 610 Medizin

description: Background: Treatment of arterial hypertension in patients with severe mental illnesses often results in polypharmacy, potentially leading to drug-drug interactions. The objective of the study was to analyse the in vivo inhibitory potential of two antihypertensive drugs, amlodipine and metoprolol on CYP2D6 catalysed 9-hydroxylation of risperidone (RIS). Methods: A therapeutic drug monitoring database with plasma concentrations of RIS and 9-hydroxyrisperidone (9-OH-RIS) of 1584 patients was analysed. Three groups were considered; a group of patients receiving RIS without a potentially cytochrome influencing co-medication (control group, R-0, n=852), a group co-medicated with amlodipine (R-A, n=27) and a group, co-medicated with metoprolol (R-M, n=41). Plasma concentrations, concentration-to-dose ratios (C/Ds) of RIS, 9-OH-RIS and the active moiety (AM), as well as the metabolic ratios were computed and compared using the Kruskal-Wallis test, the Mann-Whitney U test and the Jonckheere-Terpstra test to determine the means and different patterns of distribution of plasma concentrations as well as the concentration-to-dose ratios. Results: The median daily dosage of RIS did not differ between the groups (p=0.708). No differences were found in median plasma concentrations of RIS, 9-OH-RIS and AM. However, concentration-to-dose ratios for RIS, 9-OH-RIS and AM were significantly higher in the amlodipine group (p=0.025, p=0.048 and p=0.005). In the metoprolol group, the concentration-to-dose ratio for RIS was significantly higher than in the control group (p=0.017), while the C/D for 9-OH-RIS and AM was not. Conclusions and limitations: Our data show a potential pharmacokinetic interaction, most likely via CYP3A4 between amlodipine and RIS, reflected in significantly different C/Ds for RIS, 9-OH-RIS and AM. Although the interaction did not result in significantly higher plasma levels, changes in C/Ds and their distribution with regard to the median concentrations were observed.
Synthèse sur le diagnostic des ouvrages hydrauliques en béton à Hydro-Québec
Creators: name: Argouges, Matthieu
name: Naud, Brigitte
name: Côté, Patrice
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cet article présente une synthèse des activités de diagnostic des ouvrages hydrauliques en béton à Hydro-Québec. Après une brève présentation d’Hydro-Québec, de ses ouvrages hydrauliques, des activités liées au diagnostic, soit l’inspection, l’auscultation, l’instrumentation, les expertises et la modélisation, sont présentées.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
title: Total synthesis of complex polycyclic natural products using a novel cascade reaction
Creators: name: Alqahtani, Arwa
Publisher: name: University of Glasgow
Year: 2023

description: The guaianolides comprise a large family of natural products, which includes moroccolide A and micheliolide. The guaianolide natural products contain a 5,7,5 fused tricyclic system. Members of the guaianolide family of natural products have been shown to exhibit potent biological activities following their discovery. Extensive studies have been performed to establish the biomolecular mechanisms responsible for the biological activities of these compounds and assess their potential use as prophylactic and therapeutic agents. The significant synthetic challenges presented by the guaianolides combined with their biological activities make them interesting targets. There have been numerous syntheses of the structurally related guaianolides family, but to date no total synthesis have been reported for either moroccolide A or micheliolide, due the complexity of their structures, and only a semisynthesis of micheliolide has been attempted. With this in mind, a synthetic strategy has been developed for formation of the 5,7,5 fused tricyclic core of both natural products by application of a reaction sequence developed previously within the Clark group. This involved several key transformations including a ynenone formation, Brønsted acid mediated cyclisation to form furan followed by [3,3]-sigmatropic Cope rearrangement to construct the tricyclic core of both guaianolides. This thesis presents a synthetic strategy for guaianolide synthesis and progress toward testing the effectiveness of this synthetic strategy for rapid construction of the tricyclic core structures from simple starting materials. After an appropriate model system had been tested, the methodology was to be applied to the synthesis of the natural products micheliolide and moroccolide A. This will be the first attempted total synthesis toward both morocolide A and micheliolide.
Effet du squelette granulaire sur le développement de la FPZ dans le béton – Apport de la technique d'émission acoustique
Creators: name: Boukais, Amar
name: Dahou, Zohra
name: Matallah, Mohammed
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Une investigation expérimentale est présentée pour étudier l'effet du squelette granulaire sur l'évolution de la zone d’élaboration de la rupture (fracture process zone, FPZ) dans le béton de classe de résistance constante (25 MPa). La technique d'émission acoustique (EA) a été utilisée pour surveiller les essais de flexion trois points effectués sur des poutres entaillées pilotés par l’ouverture d’entaille (Crack Mouth Opening Displacement, CMOD). La discussion des résultats compare le comportement mécanique et les activités d'émission acoustique. Il a été conclu que la présence de la discontinuité au niveau du squelette granulaire a un effet significatif sur le processus de rupture dans le béton, il contribue à une augmentation de la taille de la zone d’élaboration de la rupture (FPZ)
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Spatial variability of concrete resistivity as a function of vibration and time
Creators: name: Xiao, Yanyan
name: Clerc, Romain
name: Schoefs, Franck
name: Karam, Wael
name: Lecieux, Yann
name: Chevreuil, Mathilde
name: Torres, Magda
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Spatial variability of concrete resistivity is a key element for optimal design of embedded resistivity sensors, which allow to catch chloride ions propagation in concrete structures. Its temporal evolution and its dependence on the vibration protocol remains however unknown. In this paper, we address these questions by assessing time-evolution of spatial variability of apparent resistivity of 10 concrete beams realized with two different vibration protocols (needle and table) and placed in a climatic chamber. We find that each beam exhibits (i) a time-independent resistivity spatial signature, and (ii) a periodicity of correlation in space, roughly corresponding to the lag of vibration protocol for both. This suggests time-invariance of resistivity’s spatial variability of sound concrete and its strong dependence to vibration protocol.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Evaluation de l’adhérence entre un béton de sable auto-plaçant comme nouveau matériau de réparation cimentaire et les substrats en béton, par un test d’arrachement direct
Creators: name: BELMOKRETAR, Karim
name: AYED, Kada
name: KERDAL, Djamel Eddine
name: MOULI, Mohammed
name: LEKLOU, Nordine
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cette étude expérimentale à un objectif d'étudier l'utilisation d'un nouveau béton de sable auto-plaçant (BSAP) pour réparations des substrats en béton ordinaire (BO). Plusieurs compositions de BSAP ont été confectionnées et testées à : L'étalement au cône d'Abrams, l'écoulement à la boite en L, la résistance à la ségrégation et la résistance à la compression, pour sélectionner le meilleur mélange apte à utiliser comme matériau de réparation. Deux types de préparation de surfaces ont été optées : traitée avec un agent adhésif (AA) et rugueuse par application de sablage (SB). La force d'adhérence entre BSAP et BO a été remplacée par un test d'arrachement direct (PULL OFF) indiqué dans la norme ASTM C1583. Les résultats obtenus ont prouvé une excellente force d'adhérence pour les substrats avec des surfaces sablées, cependant l'adhérence a été échouée pour les substrats traités par l'agent adhésif.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Finite-size effects in the quasi-one-dimensional quantum magnets Sr$_{2}$CuO$_{3}$, Sr$_{2}$Cu$_{0.99}$M$_{0.01}$O$_{3}$ (M = Ni, Zn), and SrCuO$_{2}$
Creators: name: Karmakar, Koushik
name: Singh, Surjeet
Publisher: name: arXiv
Year: 2015
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We studied the finite-size effects on the magnetic behavior of the quasi-one-dimensional spin S = $\frac{1}{2}$ Heisenberg antiferromagnets Sr$_{2}$CuO$_{3}$, Sr$_{2}$Cu$_{0.99}$M$_{0.01}$O$_{3}$ (M = Zn and Ni), and SrCuO$_{2}$. Magnetic susceptibility data were analyzed to estimate the concentration of chain-breaks due to extrinsically doped defects and/or due to slight oxygen off-stoichiometry. We show that the susceptibility of Sr$_{2}$Cu$_{0.99}$Ni$_{0.01}$O$_{3}$ can be described by considering Ni$^{2+}$ as a scalar defect ($S_{eff}=0$) indicating that the Ni spin is screened. In Sr$_{2}$Cu$_{0.99}$Zn$_{0.01}$O$_{3}$ susceptibility analysis yields a defect concentration smaller than the nominal value which is in good qualitative agreement with crystal growth experiments. Influence of doping on the low-temperature long-range spin ordered state is studied. In the compound SrCuO$_{2}$, consisting of zigzag S = $\frac{1}{2}$ chains, the influence of spin frustration on the magnetic ordering and the defect concentration determined from the susceptibility data is discussed.
description: 11 pages, 10 figures and 3 tables
Comparaison fréquentielle d’une sonde et d’une cellule électromagnétiques à différents états hydriques et salins de deux bétons à base de CEM I et de CEM III
Creators: name: Bouichou, Myriam
name: Villain, Géraldine
name: Marie-Victoire, Elisabeth
name: El Achrafi, Khodor
name: Dérobert, Xavier
name: Bouteiller, Véronique
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: La corrosion des armatures est la principale pathologie rencontrée dans les structures en béton armé, qu’elles soient Ouvrage d’Art (pont, viaduc) ou Monument Historique. Si le suivi usuel de corrosion des armatures dans les bétons est assuré par des techniques électrochimiques, l’apport des techniques d’auscultation non destructives électromagnétiques est moins connu. Or ces dernières sont sensibles aux deux paramètres clés dans les processus de corrosion, le taux de saturation et la teneur en ions chlorure du béton. Dans le cadre d’une étude prospective en laboratoire, les informations issues de mesures réalisées avec deux techniques électro-magnétiques sur des corps d'épreuves de différents bétons (à base de ciment CEM I et CEM III), en faisant varier le taux de saturation et la solution d’imbibition (eau douce et eau chlorurée à 35g/L), ont été comparées sur une gamme de fréquence entre 0.7 et 1.6 GHz. Les résultats complémentaires obtenus avec une sonde diélectrométrique SUSI-R® et avec une cellule électromagnétique coaxiale cylindrique sont cohérents. Ils montrent l’évolution proportionnelle des fréquences de résonance des deux techniques selon le taux de saturation, mais également un élargissement des pics de résonance dans le cas d’une eau chlorurée.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Structural Health Monitoring (SHM) des structures en béton armé par la thermographie infrarouge avec micro-ondes: détection de l'enrobage d'armatures par approche de transmission
Creators: name: Keo, Sam Ang
name: Brachelet, Franck
name: Defer, Didier
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cet article propose une méthodologie innovante avec la thermographie micro-ondes qui permet de déterminer l'épaisseur du béton d'enrobage d'une couche d'armatures (12 mm de diamètre régulièrement placés à 10 cm) dans un mur en béton armé (1 m x 1 m x 6,5 cm). La méthodologie est divisée en sept étapes. De la première à la quatrième étape, l'expertise des méthodes de thermographie infrarouge est appliquée. Dans la première étape, cinq campagnes expérimentales avec la thermographie micro-onde sont réalisées avec cinq angles de direction de l'antenne (correspondant aux angles des ondes incidentes): 0° (direction normale de l'antenne), 15°, 30°, 45° et 60°. De l'étape cinq à l'étape sept qui est la dernière étape, la combinaison d'une loi physique (Snell-Descartes) et d'une méthode d'analyse mathématique (loi linéaire) est nécessaire. En utilisant l'approche par transmission (la caméra infrarouge et l'antenne sont situées dans différent côté par rapport au mur détecté), la méthodologie proposée amène à déduire la valeur approchée de l'épaisseur du béton d'enrobage qui est très proche (2% d'écart) de la valeur réelle (3,8 cm), l'espacement des barres d'acier et aussi la constante diélectrique du béton. La détection de l'épaisseur d'enrobage béton est une autre nouvelle réalisation remarquable parmi toutes les applications par la thermographie infrarouge.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023
Contribution à l'évaluation des propriétés thermiques et mécaniques des constructions en béton
Creators: name: Abdallah, Talhaoui
name: Naima, Fezzioui
name: Adel, Benidir
Publisher: name: Academic Journal of Civil Engineering
Year: 2023

description: Cet article présente une étude de caractérisation thermique et mécanique du béton sous différentes conditions de cure. L'étude consiste en la préparation de plusieurs éprouvettes en béton ordinaire avec l'utilisation d'un sable de dune. Les éprouvettes sont placées dans un environnement totalement humide et ensuite retirées à des différents jours d'intervalles pour estimer à 28 jours la conductivité thermique, la vitesse de propagation des ultrasons ainsi que la résistance à la compression. Les résultats montrent que la variation de la résistance à la compression enregistrée peut atteindre 71 % entre les deux expositions extrêmes. Cette dispersion des résistances à la compression est confirmée par l'évaluation non-destructive où la différence entre les vitesses des ondes ultrasonores avoisine les 15 %. Il a été aussi remarqué l'apparition d'une corrélation positive entre le temps d'immersion dans l'eau et la conductivité thermique. En effet, l'écart de conductivité thermique peut atteindre 31 % sur la globalité de l'intervalle du temps d'immersion appliqué.
description: Academic Journal of Civil Engineering, Vol 41 No 4 (2023): Special Issue - Diagnobéton 2023