Higher-order QED effects in hadronic processes

In this presentation, we describe the computation of higher-order QED effects relevant in hadronic collisions. In particular, we discuss the calculation of mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings functions, as well as the pure two-loop QED corrections. We explain how to extend the DGLAP equations to deal with new parton distributions, emphasizing the consequences of the novel corrections in the determination (and evolution) of the photon distributions.Comment: 7 pages, 2 figures. Contribution to the Proceedings of the EPS-HEP 2017 Conferenc

Preparation and Characterization of a Renewable Pressure-Sensitive Adhesive System Derived from ε‑Decalactone, l‑Lactide, Epoxidized Soybean Oil, and Rosin Ester

Pressure-sensitive adhesives (PSAs) are prepared with plant-based thermoplastic polyester elastomers (TPPEs), rosin ester tackifier, and epoxidized soybean oil plasticizer. Controlled bulk ring-opening transesterification polymerization of ε-decalactone and l-lactide using diethylene glycol as an initiator gives ABA type block polyesters via a one-pot, two-step process with only tin­(II) ethylhexanoate. Three semicrystalline poly­(l-lactide)–poly­(ε-decalactone)–poly­(l-lactide) (PLLA–PDL–PLLA) triblock copolymers are prepared containing 100 kg mol^–1 PDL midblocks and 8–30 wt % PLLA end blocks with narrow dispersities. The mechanical behavior of the triblock architectures is investigated by tensile experiments. The triblocks are combined with the tackifier of 50 wt % and the plasticizer of 15–30 wt %. The thermal, viscoelastic, and morphological properties of the elastomers and the adhesive formulations are determined with differential scanning calorimetry, thermal gravimetric analysis, dynamic mechanical analysis, and atomic force microscopy. The renewable self-adhesive performance is evaluated showing peel strength of 1.9–2.6 N cm^–1, probe tack of 2.2–3.0 N, and static shear strength of >20 000 min comparable to current thermoplastic elastomers and PSAs. These novel materials could hold promise for sustainability and high adhesive performance

Renewable Polyurethane Microcapsules with Isosorbide Derivatives for Self-Healing Anticorrosion Coatings

Renewable polyurethane microcapsules containing isosorbide derivatives for self-repairing anticorrosion coatings were easily manufactured by interfacial polymerization of a dimer ester–diisocyanate (DE–TDI) prepolymer derived from waste vegetable oil and 1,4-butanediol (BD) as a chain extender using ultrasonication. Two kinds of corrosion inhibitors were also synthesized by the ring-opening reaction of succinic anhydride (SA) or maleic anhydride (MA). Microcapsules having 11–38 μm in diameter were obtained, and the typical core content of microcapsules was around 40–45 wt %. Salt spray tests used for evaluating self-healing anticorrosion coating systems showed significant rust retardancy, depending on the content of the isosorbide derivatives for corrosion control

Highly Stretchable and Sensitive Strain Sensor Based on Silver Nanowire–Elastomer Nanocomposite

The demand for flexible and wearable electronic devices is increasing due to their facile interaction with human body. Flexible, stretchable and wearable sensors can be easily mounted on clothing or directly attached onto the body. Especially, highly stretchable and sensitive strain sensors are needed for the human motion detection. Here, we report highly flexible, stretchable and sensitive strain sensors based on the nanocomposite of silver nanowire (AgNW) network and PDMS elastomer in the form of the sandwich structure (<i>i.e.</i>, AgNW thin film embedded between two layers of PDMS). The AgNW network-elastomer nanocomposite based strain sensors show strong piezoresistivity with tunable gauge factors in the ranges of 2 to 14 and a high stretchability up to 70%. We demonstrate the applicability of our high performance strain sensors by fabricating a glove integrated with five strain sensors for the motion detection of fingers and control of an avatar in the virtual environment

Multiblock Thermoplastic Elastomers Derived from Biodiesel, Poly(propylene glycol), and l‑Lactide

A series of [poly­(l-lactide)–poly­(dimer acid methyl ester-<i>alt</i>-poly­(propylene glycol))–poly­(l-lactide)]_<i>n</i> (PLLA–PDP–PLLA)_<i>n</i> multiblock copolymers was synthesized in a three-step procedure: PLLA–PDP–PLLA (LDPL) triblock copolymers were synthesized using ring-opening polymerization of l-lactide with PDP macroinitiators, which was prepared via step-growth melt polycondensation based on biodiesel and macro-diol, followed by chain extension of the LDPL triblock with 4,4′-methylenebis­(phenyl isocyanate). Molecular characterization revealed that the synthetic procedures yielded the desired triblock and multiblock copolymers (<i>f</i>_PLLA = 0.22–0.27). The relationship between thermal behavior and morphology indicated microphase separation into two domains in both the triblocks and multiblocks. Compared to previously reported triblocks with a high molar mass and PLLA hard blocks with inaccessible order–disorder transition temperature (<i>T</i>_ODT) values, the multiblock architectures in this study were found to become disordered at much lower temperatures (<i>T</i>_ODT = 82–128 °C). To prepare (LDPL)_<i>n</i> multiblocks, coupling low-molar-mass LDPL triblocks without free-standing thin films led to dramatically enhanced tensile properties. The self-adhesive performance of the pressure-sensitive adhesive (PSA) system including the multiblocks was evaluated, showing a peel strength of 3.1 N cm^–1, a probe tack of 1.9 N, and static shear strength of >50 000 min, which are values comparable to those of current PSAs. These biodiesel-based thermoplastic elastomers hold promise for sustainability and high value-added economy

Additional file 3: of Continuous sweep versus discrete step protocols for studying effects of wearable robot assistance magnitude

Inter-stride variability [36]. (PDF 734 kb

Additional file 5: of Continuous sweep versus discrete step protocols for studying effects of wearable robot assistance magnitude

Change in metabolic rate plotted against exosuit ankle peak moment plus minus 95% confidence interval. (PDF 59 kb

Additional file 1: of Autonomous multi-joint soft exosuit with augmentation-power-based control parameter tuning reduces energy cost of loaded walking

Variability of positive augmentation power and work with cadence. (PDF 285 kb

Intrinsic Bauschinger Effect and Recoverable Plasticity in Pentatwinned Silver Nanowires Tested in Tension

Silver nanowires are promising components of flexible electronics such as interconnects and touch displays. Despite the expected cyclic loading in these applications, characterization of the cyclic mechanical behavior of chemically synthesized high-quality nanowires has not been reported. Here, we combine in situ TEM tensile tests and atomistic simulations to characterize the cyclic stress–strain behavior and plasticity mechanisms of pentatwinned silver nanowires with diameters thinner than 120 nm. The experimental measurements were enabled by a novel system allowing displacement-controlled tensile testing of nanowires, which also affords higher resolution for capturing stress–strain curves. We observe the Bauschinger effect, that is, asymmetric plastic flow, and partial recovery of the plastic deformation upon unloading. TEM observations and atomistic simulations reveal that these processes occur due to the pentatwinned structure and emerge from reversible dislocation activity. While the incipient plastic mechanism through the nucleation of stacking fault decahedrons (SFDs) is fully reversible, plasticity becomes only partially reversible as intersecting SFDs lead to dislocation reactions and entanglements. The observed plastic recovery is expected to have implications to the fatigue life and the application of silver nanowires to flexible electronics

Les orthographes approchées à la maternelle cinq ans soutenues par un outil technologique collaboratif

Les enfants d’âge préscolaire s’intéressent tôt à la lecture et à l’écriture (Giasson, 2003) et sont aptes à réaliser des activités d’écriture bien avant leur première année du primaire (Puranik et Lonigan, 2009 ; Morin et Cantin, 2011). Afin de susciter leur intérêt envers le système écrit, ils doivent cependant être placés dans des situations réelles d’écriture et voir leurs tentatives encouragées (Montésinos-Gelet et Morin, 2006 ; Charron, Montésinos-Gelet et Morin, 2008 ; Morin, 2011). De nombreuses études se sont intéressées à l’apprentissage de l’écriture à la maternelle, mais peu d’entre elles intègrent les outils technologiques en soutien à cet apprentissage. Le récent cadre de référence de la compétence numérique est pourtant clair, il importe d’exploiter le potentiel des outils numériques pour l’apprentissage, et ce, de l’éducation préscolaire jusqu’aux études supérieures (MEES, 2019). Étant donné le potentiel de ces outils pour la réussite des élèves (CSÉ, 2000), il y a lieu de s’intéresser à l’intégration du Forum de coélaboration de connaissances (FCC) dans le processus d’apprentissage du système écrit des enfants de la maternelle cinq ans. Cette recherche qualitative-interprétative poursuit donc quatre objectifs spécifiques : 1- Identifier les apprentissages réalisés par les enfants de la maternelle cinq ans suite à l’utilisation d’un Forum de coélaboration de connaissances dans des activités favorisant la découverte des fonctions de l’écriture. 2- Identifier les apprentissages réalisés par les enfants de la maternelle cinq ans suite à l’utilisation d’un Forum de coélaboration de connaissances dans des activités favorisant la découverte des orthographes approchées. 3- Identifier les apprentissages réalisés par les enfants de la maternelle cinq ans suite à l’utilisation d’un Forum de coélaboration de connaissances dans des activités favorisant l’appropriation de connaissances reliées au thème exploité. 4- Décrire le point de vue de l’enseignante en lien avec l’utilisation du Forum de coélaboration de connaissances pour la découverte des fonctions de l’écriture, les orthographes approchées et l’appropriation de connaissances reliées au thème exploité. Des entretiens semi-dirigés, des observations en classe, des productions écrites ainsi qu’un journal de bord ont été utilisés afin de recueillir des données qui ont par la suite fait l’objet de différentes analyses. Les résultats obtenus révèlent qu’au terme du projet, les enfants ont progressé dans leur apprentissage du système écrit au niveau des fonctions de l’écrit, autant l’écrit conventionnel que l’écrit sur l’outil technologique, et des connaissances sur le système écrit. Il est intéressant de mentionner que les échanges entre les pairs se sont avérés propices aux apprentissages et au cheminement des enfants. De plus, les enfants ayant participés à l’étude ont acquis de nouvelles connaissances sur la thématique exploitée de même qu’un vocabulaire spécifique en lien avec ce thème. Finalement, la motivation des enfants est demeurée présente tout au long de la séquence des activités. Ayant un sujet peu étudié comme objet d’étude, ce projet ouvre la voie à d’autres recherches afin d’approfondir les moyens d’intégrer les outils technologiques de manière efficace dans les activités pédagogiques, et ce, dès l’éducation préscolaire