124,971 research outputs found
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
Processes Causing Attenuation in Aquifers
No full textTwo zones are considered the most relevant physical media controlling the movement of water and pollutants: the unsaturated (vadose) zone and saturated depths. Contaminants arising from both point and non-point sources, such as municipal and hazardous waste landfills, suburban septic systems, mining and petroleum production, and agriculture, all filter through the vadose zone, where resident microbes, plant roots (rhizosphere), macrofauna (earthworms, ants, and termites), and organized colloids (humic matter, minerals) reduce their concentrations to levels acceptable by sanitary authorities. The principles of the vadose zone’s functioning are not completely understood because of the presence of the many subsystems and their chemico-physical and biological interactions. The vadose zone (through the many microbiological and chemico-physical processes taking place) is potentially capable of blocking or/and
degrading any natural or artificially introduced contaminants flowing in deep waters. Soil overlying the water table provides the primary protection against groundwater pollution. Bacteria, sediment, and other insoluble forms of contamination become trapped within the soil pores. Some chemicals are absorbed or react chemically with various soil constituents, thereby preventing or slowing the migration of these pollutants into the groundwater. In addition, plants and soil microorganisms use some potential pollutants, such as nitrogen, as nutrients for growth, thereby depleting the amount that reaches the groundwater. In soils and sediments, the microbial mediated attenuation processes (natural or engineered) usually work through coupling electron acceptors such as nitrate, sulfate, and carbon dioxide with electron donors such as organic compound
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
Ricerca degli elementi-guida della nutrizione mediante spettroscopia ad assorbimento atomico sui resti scheletrici di Alba-S. Cassiano (Cuneo)
No full textIndagini paleonutrizionali e determinazione del Piombo osseo mediante spettroscopia ad assorbimento atomico sui resti scheletrici di epoca tardo-romana (IV secolo d.C.) della Villa dei Gordiani (Roma)
No full textChiesa cattolica e democrazia dopo il Concilio: quale ruolo del diritto tra libertà e verità?
No full textIl Concilio Vaticano II ha inserito alcuni elementi di discontinuità rispetto al magistero precedente nella visione della democrazia e del diritto, razionalizzando le esperienze positive del periodo precedente, da quella americana a quella delle democrazie cristiane europee, in uno schema teorico che partiva da una visione aperta della Rivelazione, passando per un’opzione preferenziale per la democrazia e giungendo ad una valorizzazione positiva della libertà religiosa. In anni recenti papa Wojtyla ha in più occasioni segnato, con alcuni interventi magisteriali, supportate da interpretazioni ‘continuiste’ del Vaticano II col magistero precedente, e in continuità con la linea dei vescovi polacchi in Concilio, un parziale revirement rispetto a quella discontinuità, in un quadro teorico in cui spetterebbe alla gerarchia ecclesiastica far valere i diritti della verità, attraverso una sicura individuazione del diritto naturale da trascrivere nelle legislazioni positive. Una sorta di ‘democrazia ecclesiastica protetta’ che è apparsa forte nella prima parte del pontificato, ma che si è rivelata poi inefficace. Ne emerge la necessità di una ripresa delle novità conciliari a partire dalla valorizzazione di un ruolo più attivo della responsabilità del laicato cattolico impegnato in politica
Ricerca degli elementi guida della nutrizione e di alcuni metalli pesanti mediante spettroscopia ad assorbimento atomico. Gortina I
No full text
Religioni, diritti e garanzie nei Paesi arabi
No full textAnalisi dei principali Stati del mondo arabo (compresa la Turchia e gli altri Paesi islamici) in cui è presente un importante requisito istituzionale, e cioè una Camera elettiva a suffragio universale (esito di elezioni competitive con pluralismo di partiti), elemento che almeno a prima vista sembra poter essere necessario, ancorché non sufficiente, a lasciar presumere un certo grado di riconoscimento di diritti e garanzie.
Effects of light modulation on plant photosynthesis process and secondary metabolism
No full textLight modulation on plants significantly affects photosynthetic process as well as plant primary and secondary metabolism. To date, four main light modulation ways have been investigated on plants: (i) monochromatic environments arranged with Light Emitting Diodes (LEDs) lamps; (ii) supplemental monochromatic light; (iii) partial light depletion; (iv) spectral shifting films. In the present work, the effect of monochromatic blue (B), red (R) and green (G) light on photosynthesis and secondary metabolism are reviewed. Studies on light modulation provide innovative solutions which allow to either maximize plant growth, thanks to the improvement of photosynthetic performances, or promote the accumulation of nutraceutical molecules in the prospective of a healthy diet
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