1,355,098 research outputs found
Dal motore a scoppio allo"scoppio" del motore
No full textSviluppi del motore a scoppio dai primi progetti a polvere pirica nel Seicento sino alla comparsa dei motori a benzina e diesel nel tardo Ottocento. Il grande successo del motore a scoppio nel Novecento. Le preoccupazioni di sociologi, economisti, politici e scienziati per la probabile esplosione della bolla di tale successo in un prossimo futuro, a causa dell'esaurimento delle fonti petrolifere e/o dell'inquinamento ambientale sempre meno sostenibile. Una soluzione possibile: il motore a idrogeno
Autoimmune bullous diseases in non-HIV Kaposi's sarcoma : a retrospective study in a large cohort of patients
No full textBackground: Kaposi's sarcoma (KS) is a rare endothelial neoplasm caused by the human herpesvirus 8 (HHV-8). Its risk is increased in immunocompromised patients, including those undergoing immunosuppressive therapy for autoimmune bullous diseases. Conversely, HHV-8 infection has been hypothesized to be a triggering factor of bullous diseases, especially pemphigus. Given the fact that both KS and autoimmune bullous diseases have a low incidence in the general population, it could be expected that the association between these disorders would be exceptional. Objectives: To assess the frequency of bullous diseases in a large cohort of non-HIV KS patients and to describe our experience concerning the clinical features, natural history and treatment options in this setting. Methods: We performed a retrospective review of all patients with non-HIV KS in association with bullous disease followed at our department between 1990 and 2016. Medical records were reviewed for demographics, medical history, clinical characteristics and treatment. Results: Among 1362 patients with classic or iatrogenic KS, 14 (1.03%) also suffered from bullous disease. The mean age at diagnosis of both disorders was 85.8 years with a male/female ratio of 9: 5. Among these 14 cases, nine (0.66%) were associated with bullous pemphigoid (BP), three (0.22%) with localized BP and two (0.15%) with pemphigus vulgaris. Seven had developed a bullous disease after being diagnosed with KS, while in the remaining seven cases, KS developed after the onset of bullous disease. As expected, KS worsened when corticosteroids were used. Conclusion: Bullous diseases seem to be more frequent among patients with KS, supporting the hypothesis that HHV-8 may be involved in their pathogenesis. Therapeutic management of these cases should take into account KS-inducing potential of corticosteroids
Temperature modulated DSC for composition analysis of recycled polyolefin blends
No full textPost-consumer plastic waste contains blends of numerous types of polyethylene (PE) and isotactic polypropylene (i-PP), whose recycling is challenging due to the complexity of this waste stream. A comprehensive knowledge of the composition of these recyclates is essential to understand the structure-property relationship of these systems and therefore upcycle them for high-value applications. To this aim, we used Temperature Modulated DSC (TMDSC) to develop a quantitative method to evaluate PE and Low-density PE (LDPE) content in recycled polyolefin blends. TM-DSC was carried out on 29 virgin PE materials, spanning densities between 960 and 862 kg/m3, characterizing a wide range of PE microstructures. Moreover, several PE/i-PP model blends were prepared by selecting LDPE, High-density PE (HDPE) and Linear Low-density PE (LLDPE) materials to blend them with i-PP of three types: homopolymer (PP-H), block copolymer (PP-B) and random copolymer (PP-R), mimicking the composition of real recyclates. Results from the TM-DSC analysis of these blends allowed us to establish methods for quantifying the amount of overall PE content and also the LDPE fraction within recyclates. The developed methods were applied to real post-consumer recycled grades, and results were compared with the ones obtained from Cross-Fractionation Chromatography (CFC) analysis and Nuclear Magnetic Resonance (NMR) spectroscopy, displaying good agreement between the latter and the TM-DSC method.We acknowledge the financial support from the REPOL project; this project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 860221. The authors wish to thank Tamara Carmeli and all the Thermal Analysis group for the help with the TM-DSC measurements, Karin Kemper for the help with procuring the materials, Andreas Albrecht for the CFC measurements, and Gerhard Hubner for the NMR measurements
Toe web intertrigo in Kaposi’s sarcoma patients: a microbiological study in a large cohort of patients
No full textKaposi ‘s sarcoma (KS) is a rare multifocal angioproliferative disease associated with human herpes virus 8 (HHV-8) infection, characterized by cutaneous nodules or plaques especially on the lower limbs. Some skin modifications, such as chronic lymphedema, plantar hyperkeratosis and interdigital desquamation, may be associated with consequent impairment of the local immunosurveillance and increased risk of some bacterial or mycotic infections. With the objective of evaluating if bacterial or mycotic infections in KS patients are supported by different microorganisms compared to control patients, we performed an observational retrospective study, comparing positive cultural swabs of interdigital intertrigo of KS patients with positive cultural swabs of interdigital intertrigo of patients admitted to our dermatologic unit during the last 10 years. One hundred KS patients and 84 control patients were admitted to this study. Some of the skin swabs from interdigital spaces were positive for more than one microorganism, and therefore we found 187 microorganisms among the KS group and 182 microorganisms in the control group. The most common microrganisms among KS patients were T. mentagrophytes (16%), S. aureus (14.9%), P. aeruginosa (13.9%), S. marcescens (5,9%), while among non-KS patients were S. aureus (26,9%), C. albicans (22%), S. agalactiae (7.7%) and E. coli (9.9%). These differences are statistically significant (p < 0.01). KS patients may be more affected by toe web intertrigo due to other bacteria and dermatophytes than the general population. During clinical examination, a careful inspection is necessary for an early diagnosis of toe web intertrigo, in order to prevent serious complications, such as cellulitis and sepsis. Consequently, a cultural examination with antibiogram is required to identify the causative agent of intertrigo and guide antimicrobial therapy
Traumi oculari da scoppio di Airbags
No full textGli Autori hanno voluto fare il punto sull’incidenza delle lesioni oculari conseguenti ad incidenti automobilistici, in particolar modo dopo scoppio di Airbags. È in dubbio che questo moderno mezzo di protezione svolga un ruolo fondamentale nel salvare la vita degli occupanti un veicolo, ma può essere lo stesso essere causa di traumi oculari, più spesso di non grave entità clinica, soprattutto nei portatori di occhiali. Pertanto, a nostro avviso, non va demonizzato ne tanto meno scoraggiato l’utilizzo, anzi riteniamo utile l’informazione degli automobilisti con la diffusione di eventuali linee guida da attuare per ridurne gli effetti traumatici ed un maggiore interesse da parte dei produttori nella realizzazione di materiali e sistemi di sempre minor impatto traumatico sulle strutture oculari
Storia dei pionieri del motore a scoppio
No full textRecensione al volume Gialli C., "Arezzo 1896-1914. Quando i cavalli divennero d'acciaio: Storia dei pionieri del motore a scoppio", Calosci, Cortona, 2002. Il volume, di carattere sostanzialmente divulgativo ed apprezzativo, è ricco di documentazione fotografica e consente di acquisire buone informazioni sulla motorizzazione della città. Pur usando, nel titolo, una definizione "i cavalli di acciaio", più consueta nello slang della locomozione ferroviari
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Variations on the Author
No full text“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
No full textWe 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
Patrimoni sonori della Toscana: il soundscape dello Scoppio del Carro a Firenze
No full textIl saggio propone una osservazione e descrizione della dimensione acustica del rito pasquale fiorentino dello Scoppio del Carro intesa in termini di paesaggio sonoro. Dopo una ricognizione breve ma sistematica delle fonti che permettono di delineare le progressive configurazioni del rito nella sua lunga storia, sono individuati gli elementi costituitivi del paesaggio sonoro dello Scoppio del Carro in relazione alle componenti della drammaturgia rituale complessiva. Obiettivo del contributo è mostrare in che termini ed entro quale misura il suono possa evidenziare negoziati simbolici e valoriali sottesi all’espressione rituale, anche in riferimento a quanto avvenuto nel periodo della pandemia. Si devono a Daniele Palma l’introduzione (pp. 180-182) e il paragrafo “Suoni della liturgia” (pp. 190-192); a Giulia Sarno, i paragrafi “Lo Scoppio del Carro: cenni storici per un inquadramento del rito” (pp. 183-188) e “Suoni del gioco pirotecnico” (pp. 199-205); ad Antonella Dicuonzo e Ludovico Peroni, in “Suoni dei cortei”, rispettivamente le pagine 192-195 e 196-199. Le conclusioni sono il frutto di una riflessione collettiva
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