177,064 research outputs found
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
Renal copper content and distribution in Wilson's disease
No full textInduced Coupled Plasma Atomic Emission Spectroscopy (ICPAES)
was applied to whole organ sections of the kidney of a patient
who died of Wilson disease to measure and map the distribution
of copper and other elements in this organ. Copper concentration
was elevated 70 times over the normal. The distribution of copper
was uneven, but it was most concentrated in the inner cortical,
outer medullary zone. The distribution of copper paralleled in
part that of iron (which was also elevated above the normal), but
did not show any correlation with the distribution of calcium,
phosphorus, magnesium, sulphur, or zinc. This study shows that
ICP-AES can be used for studying the distribution of inorganic
elements in slices of organs removed at autopsy
FATTORI DI ATTRITO PER FLUSSI GASSOSI COMPRIMIBILI IN TUBI LISCI E RUGOSI PER REGIMI DI MOTO LAMINARE, DI TRANSIZIONE E TURBOLENTO
No full textIn questo lavoro si analizza il flusso comprimibile di azoto gassoso all’interno di microcanali di diametro da 30 m a 500 m e con differenti valori della rugosità superficiale (<1%), prendendo in esame tutti i regimi di moto. La prima parte del lavoro è dedicata al confronto incrociato dei dati sul fattore d’attrito ottenuti con quelli che il Laboratorio di Termofluidodinamica dell’ENEA ha rilevato con il proprio apparato sperimentale, su tubi da 50 e 100 m in silice fusa. Si riscontra un’eccellente sovrapponibilità dei risultati, indicando come l’accordo dei rilievi sperimentali con la teoria classica è indipendente dal sistema di misura e dall’installazione. Nella seconda parte del lavoro si dimostra che le correlazioni classiche possono prevedere il fattore di attrito nel regime laminare, senza che si possa riscontrare un’evidente influenza della rugosità superficiale. Si è riscontrato che il regime di transizione inizia non prima di valori del numero di Reynolds attorno a 2000 per tubi lisci e a valori più alti (tra 3200 e 4500) per tubi rugosi, ma –contrariamente ai risultati di altri ricercatori – non è stata riscontrata una dipendenza del numero di Reynolds critico dal rapporto L/D del tubo. Sono stati riscontrati cambiamenti sia bruschi che graduali nel regime di moto, alla stregua di quanto succede nei tubi di maggiori dimensioni; la transizione continua sembra essere caratteristica dei tubi lisci, mentre i tubi rugosi sono caratterizzati da più bruschi cambiamenti del regime di flusso. Il regime di completa turbolenza è stato ottenuto sia per tubi rugosi che lisci, e i risultati per questi ultimi sembrano confermare la correlazione di Blasius, mentre per i primi si ha un accordo modesto con la relazione di Colebrook
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Applicazioni alla viticoltura ed altre colture arboree
No full textNel presente capitolo sono riportate le principali soluzioni tecniche e tecnologiche innovative che
consentono una gestione delle operazioni colturali, secondo i criteri della agricoltura di precisione.
L’applicazione di tali sistemi, nel comparto viticolo ed arboricolo in generale, rappresenta una risorsa
fondamentale per il conseguimento di elevati standard qualitativi e della sostenibilità delle produzioni
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
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Brain copper, iron, magnesium, zinc, calcium, sulfur and phosphorus storage in Wilson's disease
No full textPROJECT:
Wilson's disease (WD) is an inherited disorder of copper metabolism characterised by juvenile liver cirrhosis and by neurological symptoms. Copper levels in brain in WD have been reported to be 10 to 15 fold normal values, depending on the different brain regions. Being very few data on copper distribution in central nervous system in WD available, it seemed of interest to study the concentration of copper and of other trace elements (Zn, P, Mg, Ca, Fe and S) in the brain of a patient died for WD.
PROCEDURE:
a 56 year old woman affected by WD was admitted to our hospital with signs of hepatic failure and died few days later. At autopsy, a brain slice extending from the left to the right hemisphere was divided in 28 samples. On each sample Copper, Iron, Magnesium, Phosphorus, Sulphur, Zinc and Calcium were determined by Induced Coupled Plasma Atomic Emission Spectroscopy.
RESULTS:
the mean concentration of copper, ranging from 88 to 158 microg/g of dry tissue in all the brain specimens was higher than literature reference values, while that of the other tested elements was considerably lower.
CONCLUSIONS:
1) In the brain of WD patient examined the status of trace elements was extensively altered. Further studies are necessary to correlate the concentration of trace elements with pathological lesions and with clinical pictures. 2) The elements considered in our study showed an uneven distribution in different brain areas
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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