Inherent anisotropy of an undisturbed and compacted loess soil

Fil: Covassi, Pedro A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Rinaldi, Victor A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.This work discusses the result of an experimental study on inherent anisotropy of the loess soil found at Córdoba, Argentina. A cubical true triaxial device provided with flexible boundaries was used and the samples were subjected to an isotropic compression stress path. A brief description of the true triaxial device as well as the procedure for its assemblage and testing procedure is presented. Tests were performed on undisturbed and compacted samples. Undisturbed block type samples were recovered from open trenches. Compacted samples were made either by tamping or static compaction. The effect of compaction method on structural anisotropy was evaluated. Samples were prepared at dry of optimum, optimum and wet of optimum. Isotropic compression tests show that inherent structural anisotropy is found in both undisturbed and compacted specimens. Undisturbed samples are less compressible and develop higher degree of strain anisotropy respect the compacted samples at the same dry unit weight.http://www.iospress.nl/book/deformation-characteristics-of-geomaterials-2/Fil: Covassi, Pedro A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Rinaldi, Victor A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Otras Ingeniería Civi

Comportamiento mecánico-anisotrópico de un suelo compactado y reforzado utilizando un dispositivo triaxial cúbico

Tesis (DCI)--FCEFN-UNC, 2022Fil: Covassi, Pedro. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.En esta tesis se presenta un estudio experimental del comportamiento mecánico orientado a la investigación de la anisotropía de un Loess Pampeano compactado estáticamente, no reforzado y reforzado con geogrillas utilizando un dispositivo triaxial cúbico (también denominados en la literatura como “triaxiales verdaderos”). Se analiza la influencia de la dirección de aplicación de carga respecto de la microestructura del suelo, así como también la influencia de la tensión principal intermedia en el comportamiento mecánico del suelo compactado, no reforzado y reforzado. Se propone un programa experimental adoptando trayectorias de tensiones contenidas en un plano octaédrico y se las aplica tanto a las probetas de suelo reforzado como a las probetas de suelo no reforzado, comparando los resultados obtenidos. Para la ejecución del programa experimental, se desarrolló y calibró un dispositivo triaxial cúbico de contornos flexibles que permite la aplicación de cargas en las tres direcciones principales en forma independiente. El programa experimental muestra los primeros resultados obtenidos en el espacio de tensiones principales para este tipo de suelo y que tanto el suelo no reforzado como reforzado presentan un comportamiento mecánico anisotrópico que depende directamente de la orientación del refuerzo, la dirección de compactación de las probetas y de la orientación de las tensiones principales respecto de la microestructura del suelo. A partir de los resultados experimentales, se ajustan parámetros de distintos criterios de falla en el plano octaédrico (σoct = 80 kPa) para el suelo no reforzado incluyendo efectos de anisotropía, identificando que el criterio de Lade –Duncan isótropo es el que mejor se ajusta para los sectores I y II del plano octaédrico, mientras que el criterio de Lade anisótropose ajusta mejor al Sector III. Adicionalmente, se ajustan los parámetros de un criterio de falla de Lade-Duncan modificado para representar el comportamiento anisotrópico del suelo reforzado, considerando éste último como un medio continuo. Los criterios de falla contemplan todas las variables mencionadas anteriormente y lograron ajustarse adecuadamente al comportamiento medido en el programa experimental.Fil: Covassi, Pedro. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina

Cuadro de mando integral

El objetivo principal de este trabajo es identificar los beneficios que pueden generar en una mediana empresa de Mendoza la utilización del Cuadro de Mando Integral. La organización a estudiar es una droguería que tiene características similares a pequeñas y medias empresas creada en el año 1971 y dirigida por sus propios dueños, que comenzó como una pequeña empresa unipersonal y que hoy se encuentra ante una gran oportunidad de crecimiento.Fil: Bastías, Emiliano. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas.Fil: Covassi, José Ignacio. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas.Fil: Marí, Juan Franco. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas.Fil: Tomba, Juan Pablo. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas

The 'Brussels effect' : governance vs technology?

This contribution was delivered on 5 May 2022 on the occasion of the hybrid 2022 edition of EUI State of the Union on ‘A Europe fit for the next generation?'Jean Jacques Servan-Schreiber’s “The American Challenge” (1967) sounded an alarm on Europe’s innovation gap with the United States. Half a century later, the US, and now China, are still clearly ahead of Europe on the technological frontier of Artificial Intelligence, quantum computing, and space exploration, and enjoy the lion’s share of superstar firms and start-ups. Meanwhile, Europe’s has a growing share of zombie companies struggling to cover the cost of capital, stifling efficient businesses and start-ups. At the same time, the waves of scandal engulfing superstar firms undermine trust and challenge the legitimacy of the governance of these businesses. This panel addresses what policymakers can do to make Europe more competitive in the innovation race, while dealing with trust deficits and legitimacy gaps

Measuring mechanical anisotropy on geogrid reinforced soil using a cubical triaxial apparatus

This work describes the main findings of an experimental program focused on the characterization of the mechanical anisotropy of a reinforced cohesive soil using a cubical triaxial apparatus. Several authors have studied the influence of geometry, type, number and arrangement of reinforcement layers on the mechanical behaviour of reinforced soils, mainly dedicated to evaluate the improvement of stiffness and strength. The influence of anisotropy and principal intermediate stress has not been addressed. Conventional triaxial cell (axisymmetric) and pull-out tests are the most common type of devices used in the present studies. The implementation of an experimental program using a cubical triaxial apparatus allows us to consider all the aspects mentioned before, mainly those related to an anisotropic characterization and the principal intermediate stress influence on stress-strain and strength behaviour. Results obtained in this work, show that reinforced soil is a cross-anisotropic material, and its stress-strain and strength behaviour is strongly influenced in sectors I (lode angle between 0° and 60°) and II (lode angle between 60° and 120°) of the octahedral plane. Thus, a complete characterization of geogrid reinforced soil can be made selecting an appropriate set of stress paths in the cubical apparatus

A Human-centric digital transition : innovation and inclusiveness

This contribution was delivered on 4 May 2023 on the occasion of the hybrid 2023 edition of EUI State of the Union on 'Building Europe in times of uncertaintly'The European Commission has often promoted a “human-centric” vision of digital technologies as the guiding principle for both public and private actors when developing and deploying new technologies. As clearly expressed in the “Declaration on European Digital Rights and Principles” (22 January 2022), choosing a humancentric approach to the digital transition means that “putting people at the center of the digital transition is a key priority” for Europe. Aims such as fostering participation in the digital public space, increasing safety, security, empowerment of individuals, and ensuring freedom of choice in the digital environment are associated to this vision. In this respect, there are still many challenges associated with the digital transformation that need to be addressed and, specifically, the enormous digital divide that many countries continue to experience nowadays. Considering that the digital divide policies are focused primarily on physical access to infrastructures and 2 starting from the idea that our digital future cannot exist without robust, resilient and accessible infrastructures, this panel discusses the role of essential physical infrastructures as foundations and enabler of the digital transition. The panel will also look at how addressing the digital divide and the digital transitions are drivers for change and growth in Europe and how the transition will be financed

Characterization of eight new microsatellite loci in the invading maritime pine bast scale Matsucoccus feytaudi (Hemiptera : Coccoidea : Margarodidae)

The bast scale Matsucoccus feytaudi is a specific pest of maritime pine that is endemic in the Iberian Peninsula and southwestern France, and invasive in southeastern France, Italy and Corsica where it causes heavy damages. We developed eight microsatellite polymorphic markers using an enrichment protocol in order to study the invasion pathways and infer the genetic diversity of the populations. All loci could be successfully amplified with no evidence of null alleles. Cross-species amplifications failed to amplify the congeneric Matsucoccus joseph

Sales e rapporti con la GDO: priorità e sfide

L’emergenza che ha colpito tutto il mondo, legata al Covid-19, ha notevolmente accelerato la creazione di uno stretto legame tra i canali definiti classici e le nuove forme distributive. Per innovazioni nella distribuzione intendiamo i canali di distribuzione online (E-commerce) che hanno accompagnato la nostra vita durante i due anni di Lockdown.Nonostante la pandemia abbia notevolmente mutato le abitudini d’acquisto di ogni singolo consumatore, gli istituti di ricerca ci confermano che nel biennio 2021-2022 il desiderio dei clienti di frequentare i punti vendita e di interagire con il personale dei negozi fi sici è notevolmente aumentato. Parlando in particolar modo del mercato della cosmetica, ad esempio, oggi circa due acquisti su cinque14sono frutto del confronto tra consumatore e personale del punto vendita. Questo aspetto ribadisce la centralità delle relazioni non solo nel momento dell’acquisto, ma anche nel presidio del sell-in e conseguentemente del sell-out nella relazione tra industria di marca e distribuzione.In generale, una delle sfide chiave in questo contesto è quella di una corretta pianifi cazione delle strategie di trade marketing per massimizzare l’efficacia dell’implementazione dei veri e propri piani cliente-canale

A case of ecological specialization in ladybirds: Iberorhyzobius rondensis

International audienceSpecialization is an important attribute of a biological control agent. The maritime pine bast scale, Matsucoccus feytaudi Ducasse (Hemiptera Matsucoccidae), is an invasive species in Southeast France and the North of Italy. Iberorhyzobius rondensis Eizaguirre (Coleoptera: Coccinellidae), is a recently described ladybird species. Both adults and larvae are predaceous, feeding on egg masses of M. feytaudi, and are strongly attracted to M. feytaudi's sex pheromone. To evaluate the potential of I. rondensis as a biocontrol agent of the scale, we studied its niche breadth and prey range with emphasis on pine forests and hemipterans as tested prey. In this study, I. rondensis was found to achieve complete development only when fed on M. feytaudi egg masses (92.9% survival) and an artificial prey: eggs of Ephestia kuehniella Zeller (27.6% survival). From the 2nd instar onwards, complete development could be achieved using other prey species, although larvae had significantly higher mortality and slower development. In choice tests, M. feytaudi was the preferred prey. Surveys of the ladybird populations in the Iberian Peninsula revealed that it was found exclusively on Pinus pinaster Aiton, the sole host of M. feytaudi. The unusual specialization of I. rondensis, among other predaceous ladybirds, makes it an appropriate candidate for classical biological control of M. feytaudi