El registro lítico en la costa del golfo San Matías (Argentina): Análisis comparativo de los materiales líticos provenientes de depósitos de superficie, enterrados y concheros de la costa rionegrina; The lithic materials from San Matías Gulf coast (Argentina): Comparative analysis of the lithic artifacts from surface, buried deposits and shell middens from the Río Negro province coast Alberti, Jimena; Cardillo, Marcelo En este trabajo se presentan los resultados de los análisis comparativos realizados sobre los materiales líticos provenientes de contextos de concheros, enterrados y superficie de la costa rionegrina del golfo San Matías (Patagonia argentina). Para la comparación se utilizaron variables como el porcentaje de corteza, el grado de fragmentación de los conjuntos, la materia prima y la calidad de las rocas para la talla. También se confrontaron los atributos métricos de las piezas. Los resultados indican que existen diferencias significativas dependiendo de los contextos de recuperación (concheros o superficie). Esta tendencia no estaría relacionada con procesos de formación de los sitios, sino que estaría vinculado a conductas diferenciales de descarte dentro de los mismos espacios.; In this paper we present the results of the comparative analyses carried out on the lithic materials coming from shell middens, buried and surface contexts from San Matías Gulf, on the Río Negro province coast (Argentine Patagonia). For the comparison, we have used variables such as cortex percentage, the fragmentation degree of the assemblages, the raw materials that appear and the quality of the rocks. The metric attributes of the pieces were also compared. The results indicate that there are significant differences depending on the contexts of recovery (shell middens or surface). This trend would be related to the formation processes of the sites, but also it would be linked to differential discard behaviors within the same spaces.

Inter rectores et pastores: Thietmar de Merseburg y la acción episcopal; Inter rectores et pastores: Thietmar of Merseburg and episcopal action Neyra, Andrea Vanina Hace ya algunas décadas, el trabajo de Timothy Reuter generó una serie de cuestionamientos al sistema de la iglesia imperial o Reichskirchensystem, concepto que había prevalecido en la historiografía alemana para explicar la estrecha unión entre obispos y reyes/emperadores de la era otoniana. Aquella mirada estática entendía a las figuras episcopales como meros ejecutores de funciones específicas dentro de dicho sistema. En las últimas décadas han surgido perspectivas más dinámicas que se preguntan por el tipo de oficio surgido de la acción concreta.En el último libro del Chronicon, el cronista y obispo Thietmar de Merseburg reflexiona sobre la tarea del buen pastor y pretende elaborar una serie de consejos para los lectores y sucesores en la silla episcopal. Las sugerencias que se encuentran allí involucran las acciones del mundo terrenal, la administración de la diócesis y el cuidado de las almas, moviéndose entre lo esperado del status episcopal y la construcción y desarrollo personal de la función.Proponemos, entonces, pensar en la figura episcopal manifiesta en la obra de Thietmar a partir del posicionamiento entre esos dos mundos, el secular y el espiritual, y las tensiones involucradas entre los mismos, no sólo en vinculación con la construcción y el ejercicio de la autoridad y la función, sino también con las relaciones con el resto de los poderes.; Some decades ago, Timothy Reuter challenged the imperial church system or Reichskirchensystem, a long-lasting notion in German historiography used to explain the close union between bishops and kings/emperors of the Ottonian era. Following this static view, bishops were considered mere performers of specific functions within said system. Over the last decades, more dynamic perspectives have emerged, inquiring about the type of office rising from concrete actions. In the last book of his Chronicon, the chronicler and Bishop Thietmar of Merseburg reflects on the tasks of the good shepherd and he intends to offer some advice to readers and/or prospect bishops. Suggestions include earthly matters, the administration of the diocese and pastoral care; tackling what is expected as to episcopal status and how the office is personally constructed and developed. This article proposes to analize both the episcopal figure in Thietmar’s Chronicle by placing the bishop in the middle of two worlds: secular and spiritual¸and the tensions deriving from this, not only regarding the construction and exercise of authority, but also in relation with the rest of the (secular) powers.

Cementoin-SLPI fusion protein binds to human monocytes and epithelial cells and shows higher biological activity than SLPI Maffia, Paulo Cesar; Guerrieri, Diego; Villalonga, Ximena Soledad; Caro, Fiorella Yanina; Gómez, Sonia Alejandra; Tateosian, Nancy Liliana; Bogado, Betiana P.; Sánchez, Mercedes Leonor; Ambrosi, Nella Gabriela; Chuluyan, Hector Eduardo Secretory Leukocyte Proteinase Inhibitor (SLPI) is an antiinflammatory peptide that blocks the activity of serine proteases, primarily the neutrophil elastase. In an attempt to direct the activity of SLPI on inflamed sites, a chimera consisting of the transglutaminase II substrate domain of trappin 2 (cementoin), and the mature SLPI protein was constructed. Cell attachment and biological activity were compared between SLPI and this chimera. By using whole cell ELISA, fluorescence microscopy and flow cytometry assays we observed that the cementoin-SLPI fusion protein (FP) but not SLPI attached to a human lung epithelial cell line and monocytes. A maximum attachment was achieved 15 min after FP was added to the cell cultures. In an elastase activity assay, we observed that FP retained its antiprotease activity and that at equimolar amount of proteins, FP was more efficient than SLPI in the inhibition. Both, FP and SLPI inhibits IL-2-induced lymphocyte proliferation, however, lower amounts of FP were required to achieve this inhibition. Furthermore, FP binds to mycobacteria and maintained the bactericidal activity observed for SLPI. Overall, these results show that this new chimera is able to attach to the cell surfaces retaining and improving some biological activities described for SLPI.

Crosstalk Between Nitric Oxide and Endocannabinoid Signaling Pathways in Normal and Pathological Placentation Aban, Cyntia Estefania; Accialini, Paula Lucia; Etcheverry, Tomás; Leguizamon, Gustavo Federico; Martinez, Nora Alicia; Farina, Mariana Endocannabinoids are a group of endogenous lipid mediators that act as ligands of cannabinoid and vanilloid receptors, activating multiple signal transduction pathways. Together with enzymes responsible for their synthesis and degradation, these compounds constitute the endocannabinoid system (ECS), which is involved in different physiological processes in reproduction. The placenta, which is essential for the success of gestation and optimal fetal growth, undergoes constant tissue remodeling. ECS members are expressed in trophoblast cells, and current evidence suggests that this system is involved in placental development, apoptosis, and syncytialization. Impairment of endocannabinoid signaling has been associated with several pathological conditions such as intrauterine growth restriction and preeclampsia. Both clinical entities are characterized by dysregulation on vascular perfusion where nitrergic system performs a pivotal role. Nitric oxide (NO) is a potent local vasodepressor that exerts a critical role in the regulation of hemodynamic flow, contributing to the maintenance of low vascular resistance in the feto-placental circulation. NO production could be affected by different factors and growing evidence suggests that the endocannabinoid mediators may regulate nitrergic signaling. Herein, we review emerging knowledge supporting ECS-mediated regulation of NO production in normal placentation. Finally, we discuss how alterations in these systems could affect homoeostasis and contribute to the occurrence of placental-mediated pregnancy complications. Given the impact on women and perinatal heath, we will focus on current knowledge regarding the effects of ECS on nitrergic system in normal and pathological placentation.

An optimization approach for multiperiod production planning in a sawmill Vanzetti, Nicolás Andrés; Broz, Diego Ricardo; Corsano, Gabriela; Montagna, Jorge Marcelo Forest industry plays an important role in the national economic and social context, due to the production volume with significant impact in the region where it is located (northeast of Argentina). Sawmill production planning is a key factor for the development of this industry with serious challenges taking into account the involved interrelated tasks. Assuming a multiperiod perspective, several elements can be considered and more interesting results can be attained. The appropriate procurement of logs is an important part of the problem costs and logging can be improved if the sawmill consumption can be foreseen in advance through an integrated approach. In this work, a mixed integer linear programming (MILP) model for the optimal multiperiod planning in sawmills is proposed. An efficient solution is obtained considering a set of cutting patters (CP) for each type of log that optimize raw material yield. As a result of this optimization, appropriate procurement, distribution policy and stock management of logs can be achieved, as well as suitable production plan along the considered periods in order to fulfil the demand, with significant impact on the sawmill performance and profitability.

Niveles de burnout y engagement en teleoperadores de un call center de la ciudad de Mar del Plata, Argentina; Telemarketer´s burnout and engagement levels at a Mar del Plata, Argentina call center Silva Peralta, Yamila Fernanda; Caminos, Matías; Pereyra, Mayra; Pérez Villar, Marianela Se presenta una investigación descriptiva transversal que tiene como objetivoevaluar niveles de burnout y engagement en teleoperadores de un call center dela ciudad de Mar del Plata, Argentina. Se aplicaron el Maslach Burnout Inventory(MBI) y el Utrecht Work Engagement Scale (UWES) a 76 teleoperadores.Estadísticos descriptivos y pruebas de contraste no paramétricas según sexo,edad y antigüedad en la organización fueron calculados. Los resultados muestranniveles bajos de burnout y engagement, sólo se encontraron niveles críticos enrelación a la dimensión de burnout agotamiento emocional al contrastar losgrupos femenino y masculino.; The aim of this descriptive transactional research was to assess telemarketers' burnout and engagement levels at a Mar del Plata call center. Maslach Burnout Inventory (MBI) and Utrecht Work Engagement Scale (UWES) were applied to 76 telemarketers. Descriptive statistics and non-parametric tests considering sex, age, and seniority were calculated. Results show low burnout and engagement levels; only critical levels related to the emotional exhaustion burnout dimension were found when comparing female to male groups.

Induction of uterine hyperplasia after cafeteria diet exposure Gastiazoro, Maria Paula; Guerrero Schimpf, Marlise Luciana; Durando, Milena de Lourdes; Lazzarino, Gisela Paola; Andreoli, Maria Florencia; Zierau, Oliver; Luque, Enrique Hugo; Ramos, Jorge Guillermo; Varayoud, Jorgelina Guadalupe Our aim was to evaluate whether chronic administration of CAF affects the uterus and induces the morphological and molecular changes associated with endometrial hyperplasia. Female Wistar rats exposed to CAF from weaning for 20 weeks displayed increased energy intake, body weight and fat depots, but did not develop metabolic syndrome. The adult uteri showed an increase in glandular volume fraction and stromal area. The epithelial proliferation rate and protein expression of oestrogen receptor alpha (ERα) were also increased. The CAF diet enhanced leptin serum levels and the long form of leptin receptor (Ob-Rb) mRNA expression in the uterus. No changes were detected in either insulin serum levels or those of insulin growth factor I (IGF-I) mRNA expression. However the levels of IGF-I receptor (IGF-IR) mRNA were lower in CAF-fed animals. Overall, the results indicate that our rat model of the CAF diet produces morphological and molecular changes associated with uterine hyperplasia and could predispose to endometrial carcinogenesis.

Desempeño de un femento adjunto de Lacobacillus aracasei 90 en condiciones de corte de cadena de frío en queso Cremoso Peralta, Guillermo Hugo; Bergamini, Carina Viviana; Costabel, Luciana Maria; Pérez Audero, María Eugenia; Perotti, Maria Cristina; Hynes, Erica Rut Los cortes en la cadena de frío pueden conducir a la aparición de defectos enqueso Cremoso, principalmente por desarrollo de bacterias no fermento osobreacidificación. La incorporación de cultivos adjuntos es una de las estrategias utilizadas para controlar la microflora adventicia y mejorar la calidad de quesos; sin embargo, no hay estudios que evalúen la efectividad de estos cultivos en condiciones de pérdida de la refrigeración. El objetivo del presente trabajo fue valorar si Lactobacillus paracasei 90 (Lp90), un fermento que en estudios previos mostró un impacto favorable en quesos madurados en condiciones óptimas de salado y enfriamiento, cumplía un desempeño aceptable en condiciones de corte de cadena de frío.Se comprobó que los cortes en la cadena de frío afectaron la fermentación de la lactosa y la calidad microbiológica de los quesos. Asimismo, Lp90 controló la concentración de galactosa, pero esto derivó en una mayor acidificación. Eladjunto no provocó defectos en los quesos con corte de cadena de frío.

Proximal composition, sensorial properties and effect of ascorbic acid and α - tocopherol on oxidative stability of bread made with whole flours and vegetable oils Osuna, Mariana Beatriz; Romero, Cecilia Alejandra; Romero, Ana María; Judis, Maria Alicia; Bertola, Nora Cristina Proximal composition, shelf-life, sensory properties and effects of ascorbic acid and α-tocopherol on the oxidative stability of bread made with whole flours and vegetable oils were evaluated. Such effects were analyzed in two formulations: one with wheat flour + flaxseed flour + soybean flour + canola oil (F1), and the other with wheat flour + flaxseed flour + wheat bran + olive oil (F2). The proximal composition showed significant differences in moisture, fibre and carbohydrates due to the presence of wheat bran in one formulation. Omega 3 content in F1 was twice as high as that in F2, due to the contribution of flax meal and canola oil. Furthermore, both formulations presented good scores in the evaluated sensory attributes and a shelf-life of 2 days. The ascorbic acid in F1 produced a 40% reduction in primary lipid oxidation, while α-tocopherol as antioxidant for F2 produced a 50% reduction in thiobarbituric acid-reactive substances and exerted a greater inhibiting effect than butylhydroxyanisole. Therefore, the fortification of wheat bread with whole flour and vegetable oils is an effective tool that allows to obtain functional food and the addition of antioxidants would be a good option to prolong the stability of multigrain bread studied.

Peripheral neuroimmunoendocrine interactions: contribution of TNFRp55 to the circadian synchronization of progesterone and cytokine production in joints of mice in late pregnancy Arias, Jose Luis; Mayordomo, Andrea Constanza; Silva, Juan Eduardo; Ragusa, Juan Antonio Vicente; Rabinovich, Gabriel Adrián; Anzulovich Miranda, Ana Cecilia; Di Genaro, Maria Silvia Circadian rhythms are generated by the suprachiasmatic nucleus of the hypothalamus and involve rhythmic expression of clock genes and proteins. This rhythmicity is transferred to peripheral tissues by neural and hormonal signals. Late pregnancy is considered a state of inflammation which impacts on peripheral tissues such as joints. Tumor necrosis factor (TNF) mediates inflammatory and circadian responses through its p55 receptor (TNFRp55). Neuroimmunoendocrine interactions in joints have not been studied completely. The purpose of this study was to analyze these interactions, investigating the circadian rhythms of progesterone (Pg) and pro- and anti-inflammatory cytokines in the joints at the end of pregnancy (gestational day 18). Moreover, the impact of TNFRp55 deficiency on these temporal oscillations was explored.

Simultaneous co-immobilization of three enzymes onto a modified glassy carbon electrode to fabricate a high-performance amperometric biosensor for determination of total cholesterol Rashidi, Khodabakhsh; Mahmoudi, Majid; Mohammadi, Ghobad; Zangeneh, Mohammad Mahdi; Korani, Shahla; Goicoechea, Hector Casimiro; Gu, Hui-Wen; Jalalvand, Ali R. In this work, we have fabricated a novel amperometric cholesterol (CHO) biosensor because of the importance of determination of CHO levels in blood which is an important parameter for diagnosis and prevention of disease. To achieve this goal, cholesterol oxidase, cholesterol esterase and horseradish peroxidase were simultaneously co-immobilized onto a glassy carbon electrode (GCE) modified with gold nanoparticles/chitin-ionic liquid/poly(3,4-ethylenedioxypyrrole)/graphene-multiwalled carbon nanotubes-1,1′-ferrocenedicarboxylic acid-ionic liquid. Modifications applied to the bare GCE were characterized by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. The biosensor detected CHO in linear ranges of 0.1–25 μM and 25–950 μM with a detection limit of 0.07 μM. The sensitivity of the biosensor was estimated to be 6.6 μA μM−1 cm−2, its response time was <5 s and Michaelis-Menten constant was calculated to be 0.12 μM. Results obtained in this study revealed that the biosensor was selective, sensitive, stable, repeatable and reproducible. Finally, the biosensor was successfully applied to the determination of CHO levels in rats plasma.

Do extrativismo neoliberal ao neoextrativismo progressivo? o caso da pesca marítima argentina (1989-2015); ¿Del extractivismo neoliberal al (neo)extractivismo progresista? El caso de la pesca marítima Argentina (1989-2015); From neoliberal extractivism toward progressive (neo)extractivism? The case of the Argentinean sea fishing (1989-2015) Gómez Lende, Sebastián Es un lugar común en la literatura académica especializada afirmar que, durante las últimas décadas, en América Latina se produjo una transición desde el paradigma extractivista ‘clásico’ neoliberal basado en el capital privado extranjero hacia un neo-extractivismo progresista donde el Estado impone controles más rigurosos, explota directamente la naturaleza, capta una porción sustancial de la renta y la redistribuye para legitimar socio-políticamente el modelo. Este artículo examina críticamente esa tesis y la contrasta empíricamente para la Argentina realizando un estudio comparativo de la pesca marítima durante el modelo neoliberal (1989-2001) y el régimen neo-desarrollista (2002-2015) a partir de cuatro dimensiones de análisis: desembarques, colapso del recurso y crisis pesquera; marco regulatorio, apertura al capital extranjero y estructura de la flota pesquera; boom exportador y apropiación estatal de la renta pesquera; y debilidad regulatoria, corrupción corporativo-institucional y depredación. Los resultados muestran que el Estado neo-desarrollista alentó la continuidad y maduración de la herencia neoliberal en el sector pesquero, consolidando la preexistente dinámica expoliadora, extranjerizante, privatista y extrovertida sin en contrapartida imponer controles públicos más estrictos, transparentes y eficaces, captar parte significativa de la renta ni implementar políticas que puedan ser juzgadas como ‘progresistas’; É um lugar comum na literatura acadêmica afirmar que, nas últimas décadas, na América Latina houve uma transição de paradigma neoliberal extrativo 'clássico' com base no capital privado estrangeiro para um neoextrativismo progressivo onde o Estado impõe controles mais rigorosos, explora diretamente a natureza, capta uma parte substancial da renda e a redistribui para legitimar politicamente o modelo. Este artigo examina criticamente esta tese e a contrasta empiricamente para Argentina através de um estudo comparativo da pesca marítima durante o modelo neoliberal (1989-2001) e o regime de neodesenvolvimentista (2002-2015) a partir de quatro dimensões de análise: desembarques de peixe, colapso do recurso e crisis do setor; enquadramento regulamentar, abertura ao capital estrangeiro e estrutura da frota pesqueira; boom de exportação e apropriação estadual da renta; e fraqueza regulatória, corrupção institucional-corporativa e depredação. Os resultados mostram que o Estado neo-desenvolvimentista incentivou a continuação e maturação de herança neoliberal no setor, reforçando a existente dinâmica de pilhagem, estrangeirização, privatização e extroversão sem, em contrapartida, impor controles públicos mais rigorosos, transparentes e eficazes, capturar parte significativa da renda ou implementar políticas “progressivas”.; During the last decades, the specialized academic literature has commonly stated that Latin America suffered a transition from the neoliberal classical extractive paradigm (i.e. based on foreign private capital) toward a progressive (neo)extractivism pattern where the State imposes more rigorous controls, directly exploits nature, captures a substantial portion of income, and redistribute it in order to politically legitimize such model. This article critically examines this thesis and empirically contrasts it for the Argentinean case by conducting a comparative study of sea fishing during the neoliberal model (1989-2001) and the neodevelopmentalist regime (2002-2015). Four dimensions of analysis were used: fish landings, the resource’s collapse, and the fishery crisis; regulatory framework, opening to foreign capital and the structure of the fishing fleet; exports boom and the state appropriation of fishing income; and regulatory weakness, corporate and institutional corruption and the resource’s depredation. The results show that the neodevelopmentalist State encouraged the continuity and maturation of the neoliberal heritage in the fishing sector by consolidating its preexisting dynamics (e.g. plundering, foreignization, privatization, extroversion, etc.) without, in return, imposing stricter, more transparent and effective controls, capturing a substantial piece of income or implementing any kind of ‘progressive’ policy

Determination of damage caused by different populations of Diloboderus abderus (Coleoptera: Scarabaeidae) larvae on wheat del Valle, Eleodoro Eduardo; Mayer, Gabriel F.; Mazuquín, Gabriel; Nari, Pablo; Toffoli Arnaudo, Guillermo Daniel; Imvinkelried, Horacio Omar Wheat (Triticum aestivum L.) is the most widely cultivated cereal crop worldwide because it is an important food source for humans. South America has long been associated with wheat production and export. Given the increased application of no till in the last decades, the scarabid Diloboderus abderus has become the main soil pest of this crop. The larvae of this insect (white grubs) feed on roots, causing plant weakening and death. The aim of this work was to determine the relationship between the soil population of D. abderus larvae and the number of established wheat plants. In a plot cultivated with the wheat cultivar Don Mario Algarrobo at a seeding rate of 130 kg ha-1 and with high population levels of this pest, 1-m2 sites with 20-39; 40-60; 80-100; 120-160 and or 200-240 plants were established. At the tillering phenological stage, the number of tillers per plant and of insect larvae in each subplot was counted. The results showed a significant reduction in plant density with increasing soil larval population. The crop counterbalanced the reduction in plant number by increasing the tiller number per unit area. The present work shows that population levels above 11 larvae m-2 generate a significant reduction in the number of wheat plants established in the crop.

Comments on "Dental homologies and evolutionary transformations in Caviomorpha (Hystricognathi, Rodentia): new data from the Paleogene of Peruvian Amazonia" Verzi, Diego Hector; Morgan, Cecilia Clara; Olivares, Adriana Itati We offer brief commentaries on Boivin and Marivaux's account of caviomorph molar morphology and evolution. In accordance with Van Valen’s statement ‘Homology is resemblance caused by a continuity of information’, we reaffirm that understanding the dental morphology of rodents should be focused on identifying, i.e. keeping in sight, a given structure undergoing multiple transformation processes in ontogeny and phylogeny. Many of these evolutionary pathways may be tracked with reasonable confidence and can provide keys to recognize widespread patterns.

A New Malachite Damselfly (Synlestidae: Odonata) from the Eocene of Patagonia, Argentina Petrulevicius, Julian Fernando A new synlestid zygopteran, Madres delpueblo n. gen. n. sp., is described from the middle Eocene of Río Pichileufú, Patagonia, Argentina. The new genus is characterised by wing characters such as the discoidal cell narrow and long; Ax2 aligned with the arculus; MP distinctly curved after its origin; CuP+AA fused to the hind margin half of the length of the discoidal cell; CuP closer to Ax2 than to Ax1. Needle damselflies or Malachites are represented in other two Patagonian Eocene localities, by nymphs and adults. The new genus enlarges the fossil record of Lestomorpha in Argentina to four extinct genera: Promegalestes, Austroperilestes, Inacayalestes and Madres n. gen. versus two Recent ones: Lestes and Archilestes.

Migración no autorizada y procesos de regularización en Argentina: el caso senegalés; Unauthorized migration and regularization processes in Argentina: the senegalese case Zubrzycki, Bernarda El objetivo de este trabajo es analizar el Régimen de Regularización Migratoria para ciudadanos senegaleses realizado en el año 2013 en el contexto de la nueva ley migratoria argentina, ley enmarcada en la perspectiva de la gobernabilidad migratoria. Las ideas que exponemos son resultados preliminares de una investigación en curso enfocada en analizar el impacto que tuvo el programa regulatorio en el colectivo de migrantes senegaleses. El caso senegalés vuelve a mostrar las limitaciones de la ley de migraciones, más allá de sus avances en materia de derechos para los migrantes. La inmigración persiste concebida como problema a partir de la irregularidad, donde los migrantes sólo pueden ser aceptados cuando su presencia lo amerita o cuando demuestran medios de vida “lícitos y útiles”. Y si bien para la ley la migración es un derecho, éste es ejercido de manera discrecional hacia ciertos grupos, por ejemplo, a través de la exigencia de visados.; The purpose of this study is to analyze the regime of migratory regularization for Senegalese citizens in the year 2013 in the context of the new Argentine immigration law.The ideas that we present are preliminary results of an ongoing study focused on analyzing the impact that the regulatory program had on the collective of Senegalese migrants.The Senegalese case shows the limitations of migration law, beyond advancement of rights for migrants. Immigration continues to be conceived as a problem of irregularity, migrants can only be accepted when something warrants their presence or when they show that their lives are "lawful and useful". And while migration is a right, it is exercised in a discretionary way towards certain groups, for example, through the requirement of visas.

Magnetic Remote Activation of Shape Recovery in Nanocomposites Based on Tung Oil and Styrene Meiorin, Cintia; Actis, Daniel Guillermo; Montoro, Fabiano E.; Moscoso Londoño, Oscar; Aranguren, Mirta Ines; Muraca, Diego; Mendoza Zélis, Pedro; Knobel, Marcelo; Mosiewicki, Mirna Alejandra The activation of unconstrained shape recovery in bio-based polymeric nanocomposites is successfully achieved using magnetic nanoparticle heating. The materials investigated in this work present several distinct physical and chemical characteristics worth pointing out: they can be deformed and the original shape can be recovered by remotely heating the samples above their switching temperature, which is determined by their glass transition temperatures. Also, their chemical composition is largely based on biomass (the polymeric matrix contains more than 50 wt.% of raw tung oil). Magnetic heating performance is strongly affected by both the physical properties and the concentration of the nanoparticles loaded into the matrix. The concentration of nanoparticles is associated with the formation of agglomerates or clusters, which determines the dipolar interactions among the nanoparticles. The particles used in this work are able to absorb enough energy from an alternating magnetic field to heat the matrix and initiate the shape recovery. Although the sample with the highest content of magnetic solute (10 wt.%) presents the highest degree of agglomeration, it is also the sample with the best remote activation of shape recovery, according to the temperature reached under magnetothermal measurements and the time of actuation.

Cross-Section Analysis of the Composition of Sprayed Cu 2 ZnSnS 4 Thin Films by XPS, EDS, and Multi-Wavelength Raman Spectroscopy Valdes, Matias Hernan; Pascual Winter, María Florencia; Bruchhausen, Axel Emerico; Schreiner, Wido H.; Vazquez, Marcela Vivian A detailed cross-section analysis of the chemical composition of sprayed Cu 2 ZnSnS 4 thin films is presented. X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy (with near-IR, visible, and UV-lasers) are used to demonstrate that while CZTS effectively forms within the bulk of the film, there is some degree of element segregation, formation of undesirable secondary phases, and the presence of a disordered kesterite structure across the film. Different penetration depths of the excitation signals correspond to the many different surface sensitive techniques employed in this work. XPS results reveal that the surface of Cu 4 ZnSnS 4 (CZTS) films presents a high concentration of tin and zinc and a low sulfur concentration, while being highly depleted in copper. EDS, XRD, and infrared Raman spectroscopy confirm that the composition of as-sprayed and sulfurized films is close to stoichiometric Cu 2 ZnSnS 4 . Resonant UV-Raman spectroscopy helps to identify secondary phases located at the external surface of sprayed and sulfurized CZTS films (mainly ZnS, ZnO), while VIS-Raman spectroscopy helps to identify a disordered kesterite structure close to the surface. Secondary phases need to be chemically etched when aiming at incorporating kesterite films obtained by spray pyrolysis into photovoltaic devices.

Optimal Multiproduct and Multiechelon Supply Chain Network Design Montagna, Agustín Francisco; Cafaro, Diego Carlos This work proposes a novel approach for the optimal design of multiproduct supply chain networks (SCN). Through a mixed integer linear programming (MILP) formulation the aim is to establish the structure of facilities that minimizes costs over the planning horizon, taking into account all the SCN's distinctive characteristics. We develop a generalized approach optimally determining the location of various types of facilities, multiproduct flows and demand fulfillment from any node in the network. This allows capturing the intertwined nature of decisions, leading to more efficient results. The proposed approach does not limit the number of echelons or layers. Instead, through a novel formulation, the optimal number of echelons is determined by the model, depending on the product to be supplied. To capture the economies of scale governing capital investments and operational costs, different types of facilities are proposed. Besides, the transportation expenses take different unitary costs according to the type of nodes being connected. Finally, the concept of waiting cost is introduced in order to capture the responsiveness of the SCN through the measurement of the time required to fulfill the clients? demands. A case study with different demand patterns and data structures is addressed to assess the potentials and efficiency of the SCN designs obtained with the proposed approach.

An effective continuous-time formulation for scheduling optimization in a shipbuilding assembly process Basán, Natalia Paola; Achkar, Victoria Gabriela; Garcia del Valle, A.; Mendez, Carlos Alberto This work aims at finding an optimal solution of assembly operations in a system of multi-stage production in a shipyard. Shipbuilding of large-size ships is a complex manufacturing process involving the production and assembly of a big quantity of blocks. These blocks are then assembled on the block erection final process, with a predefined order. To achieve competitiveness in this market, the development of efficient operation strategies is a potential alternative. To reach this objective, a mixed-integer linear mathematical model (MILP) is proposed. The model is based on the continuous time-slot time batches concept. This mathematical formulation allows obtaining efficient solutions to academic problems with reasonable computational effort. The MILP problem was tested and computational experiences were reported for industrial problems.