1,720,973 research outputs found
Hydrogel Platforms for Water Remediation and Volatile Organic Compound Sensing
No full textQuesta tesi sviluppa piattaforme a base di idrogel per la decontaminazione delle acque reflue e il rilevamento di inquinanti in aria. Nella prima parte è stato sintetizzato un idrogel cationico a base di lignina (LS–pAAm–DAC) e valutato come materiale adsorbente selettivo per farmaci anionici. Il materiale, caratterizzato da struttura porosa, comportamento elastico ed elevato rigonfiamento, rimuove efficacemente diclofenac sodico (DCF-Na) in esperimenti in batch e in colonna a letto impaccato. L’analisi di cinetiche e isoterme conferma un assorbimento controllato dalla diffusione e prestazioni riproducibili in condizioni statiche e dinamiche.
Per combinare adsorbimento e degradazione, il framework metallico-organico MIL-100(Fe) è stato incorporato nell’idrogel ottenendo un composito a doppia funzione per la rimozione del naprossene sodico (NPX-Na). Diffrazione a raggi X e SEM/EDS mostrano che MIL-100(Fe) mantiene la cristallinità ed è distribuito in modo omogeneo nella matrice. Il composito presenta rigonfiamento leggermente ridotto ma maggiore capacità di adsorbimento verso NPX-Na, è rigenerabile per cicli consecutivi di adsorbimento/desorbimento e agisce come catalizzatore foto-Fenton eterogeneo: in presenza di UVA/H2O2 degrada NPX-Na, come confermato dall’identificazione di prodotti di fotodegradazione mediante HPLC/MS.
La seconda parte riguarda il monitoraggio della qualità dell’aria e descrive un sensore fotonico compatto basato su reticoli di diffrazione in trasmissione scritti a laser in un sottile strato idrogel/resina. I reticoli a base di idrogel operano in condizioni ambiente e superano i controlli in sola resina, convertendo variazioni di indice di rifrazione indotte da diversi VOCs in segnali ottici distinti per ampiezza e cinetica. L’integrazione dell’idrogel aumenta la sensibilità del dispositivo, che è a basso consumo, riproducibile e adatto al monitoraggio distribuito di ambienti interni.This thesis develops hydrogel-based platforms for water remediation and gas sensing. First, a cationic lignin-based hydrogel (LS–pAAm–DAC) was synthesized and evaluated as a selective adsorbent for anionic pharmaceuticals. The material exhibits interconnected porosity, elastic behaviour and high swelling, which translate into high diclofenac sodium (DCF-Na) removal in batch and packed-bed column tests. Kinetic and isotherm analyses indicate diffusion-controlled uptake and predominantly monolayer adsorption, confirming reproducible and scalable performance in static and dynamic conditions.
To couple adsorption with degradation, the metal–organic framework MIL-100(Fe) was embedded in the hydrogel to obtain a dual-function composite for naproxen sodium (NPX-Na) removal. XRD and SEM/EDS show that MIL-100(Fe) retains its crystallinity and is uniformly dispersed within the network. The composite displays enhanced NPX-Na adsorption, good regenerability over repeated adsorption/desorption cycles, and acts as a heterogeneous photo-Fenton catalyst. Under UVA/H2O2, it efficiently degrades NPX-Na, as supported by HPLC–MS identification of selected photoproducts.
Finally, the hydrogel was integrated into laser-written transmission diffraction gratings to implement an optical sensor for volatile organic compounds (VOCs). Thin hydrogel/resin gratings operate at ambient conditions and outperform resin-only controls, converting VOC-induced refractive index changes into robust optical signals. Different analytes and doses produce distinct response amplitudes and kinetics, reflecting their physicochemical properties. The proposed platforms demonstrate how hydrogel-based materials can be engineered as versatile tools for contaminant removal and indoor air quality monitoring
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Alceste. Excerpts - Don Mus.Ms. 539 : V (4), Coro, orch; WotG 1A.37
No full textother parts missingChristoph Willibald GluckText: Ranieri Simone Francesco Maria de' Calzabigi. - Quelle: manuscript. - Provenienz: Fürstlich Fürstenbergische Hofbibliothek, Donaueschingen[caption title:] Chor aus der Oper: | Alceste | von | Ritter Gluc
Orfeo ed Euridice. Excerpts - Don Mus.Ms. 540 : V, orch; WotG 1A.30/78
No full textother parts missingChristoph Willibald GluckText: Ranieri Simone Francesco Maria de' Calzabigi. - Quelle: manuscript. - Provenienz: Fürstlich Fürstenbergische Hofbibliothek, DonaueschingenAriette | aus | Orfeo | et | Euridice | Von | Ch v: Glu
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Orfeo ed Euridice. Excerpts - Don Mus.Ms. 538 : T, Coro, orch; WotG 1A.30/76
No full textAuf der T- und S-Stimme Sängernamen: "Herr Hofrath Sulger", "E. A."Christoph Willibald GluckText: Ranieri Simone Francesco Maria de' Calzabigi. - Quelle: manuscript, manuscript. - Provenienz: Fürstlich Fürstenbergische Hofbibliothek, DonaueschingenScene und Chor | aus | Orpheus. | von | Chr: Gluc
Orfeo ed Euridice. Excerpts. Arr - Don Mus.Ms. 2112 : cemb; WotG 1A.30/78 WotG 1A.30/77
No full textChristoph Willibald GluckText: Ranieri Simone Francesco Maria de' Calzabigi. - Quelle: manuscript. - Provenienz: Fürstlich Fürstenbergische Hofbibliothek, DonaueschingenOPERA | Orfeo ed Euridice | Atto Terzo | Per il | Clavi Cemballo. | è | Forte piano. | Per Musica | Del Sig= C Gluc
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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