196,012 research outputs found
Flussometro primario per la misura di piccole portate di gas con riferimento alla pressione atmosferica
No full textAlcuni prodotti devono garantire una certa ermeticità e quindi devono essere sottoposti ad un controllo che consiste nella misurazione del flusso di gas in ingresso o uscita attraverso possibili cricche, porosità, microfessure.
Tra le diverse metodologie applicabili per la ricerca delle perdite, alcune sono molto semplici e permettono analisi qualitative, mentre altre, più sofisticate, consentono di quantificare la perdita. È comunque necessario disporre di rivelatori tarati in grado di misurare il flusso di gas. Le fughe di riferimento, componenti essenziali per la taratura dei rivelatori, sono in genere capillari in acciaio e generano un flusso di gas quando ai lori estremi vi è una differenza di pressione.
Per garantire la corretta riferibilità delle fughe di riferimento l’INRIM ha progettato e realizzato un flussometro, campione primario per la misura di portate di gas < 1x10-4 Pa m3/s con riferimento alla pressione atmosferica.
Recentemente è stato progettato e realizzato un sistema di controllo termico attivo al fine di migliorare l’accuratezza del flussometro ed estendere il limite inferiore di misura. Le modifiche apportate hanno portato tale limite a 1x10-6 P am3/s con incertezza estesa inferiore al 3%
Environmental fecalization in Milan, nothen Italy: prevalence of canine intestinal parasite and evaluation of health risk
No full textA case of aneurysm on a persistent hypoglossal artery treated by endovascular coiling
No full textWe describe a 22-year-old woman admitted to hospital in emergency with nuchal headache and vomiting. CT scan disclosed subarachnoid hemorrhage. Digital subtraction angiography with three-dimensional rotational acquisitions showed a ruptured aneurysm of a right persistent primitive hypoglossal artery as the cause of symptoms and hemorrhage. The patient was successfully treated with endovascular coiling of the aneurysm. This is the second literature report describing endovascular treatment in this unusual condition
Valutazione della variabilità intra- ed inter-specifica nella componente polisaccaridica del genere Ophrys L.
No full textDescription of six cases of child cauda equina leptomeningitis: an emerging disease
No full textChild cauda equina leptomeningitis (CCEL) is a typical clinical example of aseptic meningitis with patterns of an emerging disease, and it affects children aged 2-9. Here we will describe six cases of CCEL. After the prodromes, all children underwent an acute phase with hypoasthenia of the lower limbs, hyporeflexia, staggering and ataxia with steppage. Only in one case there were generalized fits and coma of grade 1-2 too. All children underwent a spinal magnetic resonance imaging (MRI), proving pathologic enhancement of cauda equina and conus medullaris leptomeningitis. At the same time, MRI made possible the differential diagnosis between cauda equina leptomeningitis and isolated minor forms of Guillain-Barre syndrome involving the lower limbs. Three hypotheses will be formulated for understanding the pathogen mechanism(s) of CCEL. The first one is based on the presence of an immediate viral damage on the meninges, the second one, the more likely, contemplates the occurrence of an immunomediated mechanism in a host genetically prone to react in an abnormal way from an immune viewpoint. The third hyphotesis consists in a two-time damage: an early immediate damage from the virus, and a later immunomediated reactio
Diffusion MRI and Spectroscopy in the Neuroradiological follow-up of an Infant with Severe Perinatal Asphyxia
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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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