884 research outputs found
Cellulose nanofibers to improve the mechanical and durability performance of self-healing Ultra-High Performance Concretes exposed to aggressive waters
No full textThe effects of including cellulose nanofibers (CNFs) in Ultra High Performance Concretes (UHPCs) have been studied in this paper in terms of recovery of both durability and mechanical properties because of the stimulated self-healing behavior. To this purpose, flexural tests on 4-point bending on 30 mm thin and 100 mm wide beam specimens have been carried out to evaluate the mechanical recovery due to self-healing, together with Double Edge Wedge Splitting tests that have been performed to identify the tensile stress crack-opening behavior. Moreover, water permeability and chloride diffusion tests have been performed to evaluate the recovery of durability properties on healed specimens subjected to extremely aggressive environments rich in chlorides and sulfates. Microstructural analysis has been also performed to confirm the enhancement on durability performance due to the presence of CNFs. The presence of CNFs has improved self-healing performance of UHPC since for the same crack width value and same healing period (1, 3 or 6 months) the specimens with CNFs reached higher crack sealing rates compared to those without nano-additions. As a matter of fact, the total sealing of the cracks over the 6-month investigated period was only observed on specimens with CNFs
Alf Nilsen-Børsskog — The Author Chosen by the Language
No full textThis article discusses Alf Nilsen-Børsskog’s four-volume series of novels Elämän jatko [Continuation of life, 2004–2015], seen as the first literary works treating the Kven culture from a native perspective. Nilsen-Børsskog’s novels are analysed as constituting a “counterstory”, a term coined in the postcolonial cultural research paradigm to refer to self-representation. The Kvens have been considered a national minority in Norway since 1999, and their language has been an official minority language since 2005. The present author scrutinizes how Nilsen-Børsskog’s work differs from previous literary descriptions of this minority, often marked by the frequent use of stereotypes of the Kven language and culture
LIBS and LA-SD-OES Analysis of Minor and Trace Elements in Steel Samples
No full textAuthor Valentin Ehrentraut, BScMasterarbeit Universität Linz 2022Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
Capacità di autoriparazione di compositi cementizi con nanofibre di cellulosa
No full textLAUREA MAGISTRALEIl calcestruzzo soffre della formazione di microfessure durante la fase di maturazione o durante l’applicazione del carico di esercizio. Queste fessure possono portare al deterioramento della struttura a causa di infiltrazioni di acqua, cloruri, solfati e altri agenti. Questo può portare a costi elevati per la riparazione delle strutture nel tempo.
Per diminuire tali problematiche legate alla presenza delle fessure, negli ultimi anni la ricerca si è spostata sul fenomeno del self-healing del calcestruzzo e sulla possibile aggiunta di materiali innovativi che ne accelerino il processo. Questi tipi di materiali avanzati però risultano tuttora nella fase di ‘prova di fattibilità’ e il numero di strutture realizzate con un calcestruzzo autorigenerante è molto limitato, a causa della variabilità nei risultati degli studi fatti in merito alla guarigione autonoma e alla mancanza di standardizzazione del meccanismo di self-healing.
A tale scopo nasce nel 2018 il progetto ReSHEALience, finanziato dalla Commissione Europea nell’ambito del programma Horizon 2020. Il progetto ha come obbiettivo la realizzazione di un calcestruzzo ad alta durabilità (UHDC) e lo sviluppo di una metodologia di progettazione denominata Durability Assessment-Based Design (DAD).
L’obbiettivo primario di questa tesi è quello di studiare l’effetto dell’aggiunta di nanofibre di cellulosa (CNF) ad un calcestruzzo fibrorinforzato ad alta resistenza in merito alla possibilità di migliorare la sua durabilità quando questo viene immerso in acqua geotermica o maturato in una camera a temperatura e umidità controllata.
A tale scopo, prove di caratterizzazione meccanica vengono effettuate su provini cubici, travi sottili e travi prismatiche. Successivamente la capacità di autoguarigione viene investigata tramite analisi al microscopio delle fessure su travi sottili e prove di permeabilità all’acqua su dischi sottili. Infine viene studiata la penetrazione dei cloruri in dischi spessi 8 cm immersi in acqua salata fino a 6 mesi di tempo.
I risultati hanno dimostrano l’efficacia dell’aggiunta delle nanofibre di cellulosa nella miscela cementizia, sia in termini di recupero delle proprietà meccaniche, sia in termini di richiusura delle fessure. In particolare si è osservato un incremento della capacità del self-healing quando il calcestruzzo viene immerso in acqua geotermica, rispetto al caso di guarigione nella camera a temperatura e umidità controllata.Concrete suffers from the formation of cracks during the hardening phase or during the application of external loads. These cracks could lead to the deterioration of the structure due to the infiltration of water, chlorides, sulfates and other aggressive particles. This could result in bigger costs for the maintenance and repair of the structure.
In order to solve these issues connected with the presence of the cracks, in the past years research has focused on the self-healing capability of concrete and on the possibility to enhance this process with the introduction of new materials in the cement paste. These new and enhanced materials are still in the ‘proof of concept’ phase and the number of structures designed implementing the self-healing of concrete is very limited, due to the lack of standardization and reliable experimental results.
To this end, the Europian Commision founded in 2018 the ReSHEALience project, part of the Horizon 2020 program. The project aims to develop an Ultra High Durability Concrete (UHDC) and the development of a design methodology called Durability Assessment-Based Design (DAD).
The present study investigates the benefits in terms of durability enhancement of a Ultra High Fiber Reinforced Concrete when Cellulose Nanofibers (CNF) is added to the mixture.
The experimental campaign consists of tests performed on cubic specimens, deep beams and thin beams for the evaluation of the mechanical properties, The self-healing capability of the cement paste is analyzed on thin beam specimens through visual investigation of the cracks and on thin discs specimens through water permeability tests. In the end, the chloride penetration is investigated on discs with 8 cm of thickness immersed in salt water up to 6 months.
Results show the benefits given by the addition of cellulose nanofibers to the cement paste both in terms of recovery of the mechanical properties and crack sealing capability. Particularly, the best results in terms of self-healing are observed in the specimens immersed in geothermal water, rather than the case of specimens cured inside the humidity chamber
Johann Siegmund Valentin Popowitsch (Janez Žiga Valentin Popovič), Vocabula Austriaca et Stiriaca 1-2 (Frankfurt am Main 2004)
No full textThe Austrian dictionary composed by the Slovenian scho-lar Janez Žiga Valentin Popovič (1705-1774) in the third quarter of the 18th century was only published in 2004, and edited by Richard Reutner, who wrote an extensive introduction to it. The dictionary comprises many language-geographical data for the German language, excellent explanations and many comparisons with much information provided regarding Popovic's mother tongue. The author broad horizon is admirable, especially with regard to the German language area and the linguistic literature of that time.Avstrijski slovar, ki ga je v tretji četrtini 18. stoletja sestavil slovenski učenjak Janez Žiga Valentin Popovič (1705-1774), je izšel šele leta 2004 v uredništvu Richarda Reutnerja, kije k njemu napisal obsežen uvod. Slovar vsebuje mnogo jezikovnogeografskih podatkov za nemščino, odlične razlage in marsikaj primerjalnega, veliko pa se najde tudi v zvezi s Popovičevo materinščino. Občudovanja vredna je avtorjeva razgledanost predvsem po nemškem jezikoslovnem prostoru in po takratni jezikoslovni literaturi
Valentin N. Volóchinov: um filósofo da ciência da linguagem
No full textThis text address the work of Russian scholar Valentin N. Vološinov, author of the book Marxism and the Philosophy of Language. The objective is to demonstrate a set of characteristics that place Vološinov as a participant in the critique of science movement, which had its epicenter in Germany, between the years 1840 and 1900. To this end, in addition to a general reflection, which recovers the meaning of the term “criticism” most present in the academic environment of the time, this text considers two points of the much mentioned – and, apparently, somewhat misunderstood – opposition of the Russian thinker to the linguistics of Ferdinand de Saussure, as this linguistics is presented in the Course in General Linguistics. Finally, by way of provocation, this text outlines a few words about the proximity between the epistemological works of Valentin N. Vološinov and Wilhelm Dilthey.Este texto aborda la obra del estudioso ruso Valentin N. Voloshinov, autor de la obra Marxismo y filosofía del lenguaje. El objetivo es demostrar un conjunto de características que sitúan a Voloshinov como participante del movimiento de crítica científica, que tuvo su epicentro en Alemania, entre los años 1840 y 1900. Para ello, además de una reflexión general, que recupera el significado del término “crítica” más presente en el ambiente académico de la época, se consideran dos puntos de la tan mencionada –y, aparentemente, algo incomprendida– oposición del pensador ruso a la lingüística de Ferdinand de Saussure, tal como se presenta esta última en el curso de lingüística general. Al final, a modo de provocación, se esbozan algunas palabras sobre la proximidad entre las obras epistemológicas de Valentin N. Voloshinov y Wilhelm Dilthey.O presente texto aborda o trabalho do estudioso russo Valentin N. Volóchinov, autor da obra Marxismo e filosofia da linguagem. O objetivo é demonstrar um conjunto de características que situam Volóchinov como um partícipe do movimento de crítica das ciências, o qual teve seu epicentro na Alemanha, entre os anos 1840 e 1900. Para isso, além de uma reflexão geral, que recupera a acepção do termo “crítica” mais presente no ambiente acadêmico da época, são considerados dois pontos da muito mencionada – e, ao que tudo indica, um tanto mal compreendido – oposição do pensador russo à linguística de Ferdinand de Saussure, tal como essa última é apresentada no Curso de linguística geral. Ao fim, a título de provocação, são esboçadas algumas palavras a respeito da proximidade entre os trabalhos epistemológicos de Valentin N. Volóchinov e Wilhelm Dilthey
Shifting patterns of fruit production in tropical forests with negative outnumbering positive trends
No full textAnalysis related to Shifting patterns of fruit production in tropical
forests with negative outnumbering positive trends from Hacket-Pain et al.
Code generated by Journé Valentin.
For details please check the README (Wiki) and the main study
corresponding author: Andrew Hacket-Pain; [email protected]
Money for Maria by Valentin Rasputin: translation and analysis
No full textO objetivo desta pesquisa é apresentar e analisar a primeira novela do autor russo soviético Valentin Raspútin, Dinheiro para Maria, publicada originalmente em 1967. A tradução em português do objeto de estudo é acompanhada de notas contextuais, tanto históricas quanto tradutórias. Para aprofundarmos mais o assunto, é apresentado um breve histórico da coletivização das terras na URSS e as condições sociais e artísticas que permitiram o florescimento da \"prosa de aldeia\". Além disso, são apontados alguns dados biográficos do autor e alguns aspectos de sua obra que o enquadram nesse movimento artístico. Finalmente, são analisadas as diversas camadas cronotópicas da novela e seu caráter dialógico.The aim of this research is to present and analyze the first novel by Soviet Russian author Valentin Rasputin, Money for Maria, originally published in 1967. The Portuguese translation of the object of study is accompanied by contextual notes, both historical and translational. To further explore the subject, a brief history of the collectivization of land in the USSR and the social and artistic conditions that allowed the flourishing of \"village prose\" is presented. In addition, some biographical data of the author and some aspects of his work that fit him in this artistic movement are pointed out. Finally, the various chronotopic layers of the novel and its dialogical character are analyzed
Dal genere all'allegoria: concerti di Valentin de Boulogne nei disegni e nelle stampe di traduzione
No full textLa studiosa, muovendo dall’analisi di un dipinto di Leandro Bassano, conosciuto attraverso una stampa di fine Settecento, sottolinea i collegamenti tra la figurazione veneta del concerto e il linguaggio utilizzato nei quadri musicali da Caravaggio e dai suoi seguaci.
I seguaci della manfrediana methodus usavano descrivere i momenti musicali inserendoli nell’atmosfera scura delle taverne e dei vari ritrovi mondani. Gli strumenti musicali, raffigurati in queste scene si ricollegano ad una complessa simbologia. Gradualmente il concerto dipinto assume significati reconditi che travalicano l’apparente consesso di musicisti: ora i concetti di armonia e di musica si fondono nella definizione figurativa del concerto allegorico.
Valentin de Boulogne non tardò a farsi la nomea di raffinato esecutore di composizioni di genere, in particolare a carattere musicale, successivamente tradotte a stampa. Molti motivi raffigurati, in un suggestivo schema di riflessi, appaiono all’interno delle altre scene di concerti e riunioni varie realizzate dal pittore, ove le espressioni naturalistiche si confondono con gli elementi simbolici.
Alla luce delle osservazioni e dei dati riferiti in questo studio, si può avanzare l’idea che la scena allegorica ambientata in taverna sia una delle principali espressioni della tradizione manfrediana, particolarmente nelle declinazioni di Valentin.
Infine si proposne l'attribuzione al frnacese di un disegno rintracciato dall’autrice, e tradizionalmente attribuito a Rutilio Manetti; si aprono interessanti quesiti, costituendo un inedito tassello nella storia del dipinto di Valentin de Boulogne Concerto a quattro personaggi e un bevitore (New York in collezione privata, 1626).The author analyses a painting by Leandro bassano, through a print of the late eighteenth century, and empahsizes the connections between the figuration used in Venetian concert painting and the language applied in the musical paintings by Caravaggio a nd his followers.
Finally the analysis of a drawing found by the author, and tradinally attributed to Rutilio Manetti, opens up interesting questions in regard to the history of the paioonting Concert with Characteres and a Drinker by Valentin de Boulogne, now in private collection in New York
Learning to Speak Indigenous Languages with Compassionate Listening Practices
No full textIndigenous language reclamation programs are considered an important way to reclaim indigenous identities and empower indigenous community members. Yet, without enough considerations for the participants, they could inhibit the language learning of those participants.The goal of this article is to empower Ryukyuan indigenous language learners using compassionate listening practices to support their learning. The author focuses on language reclamation activities targeting new speakers of the Yaeyaman language. The author analyzed interviews with new speakers (learners) of Yaeyaman and conducted videorecordings.This article identifies the following three issues: (1) linguistic purism, (2) linguistic in security, and (3) lack of ethical principles. These problems seem to hinder new speakers’ motivation to learn and speak their heritage languages. The author found that the emotions and feelings of new speakers are often overlooked and thus, suggests that new learners can be empowered by addressing their feelings through compassionate listen practices. Hence, we need to focus on the emotional support of language learners. The article proposes using compassionate listening practices to empower language learners who are embedded in social power struggles both from outside and inside the language community.https://doi.org/10.33063/diva-472014</p
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