1,721,025 research outputs found
The use of calf bone in young patients treated with acetabulum osteotomy
No full textThe use of calf bone in young patients treated with acetabulum osteotom
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
EQUILIBRIUM AND KINETIC-STUDY OF NITRIC-OXIDE BINDING TO PHTHALOCYANINATOIRON(II) IN DIMETHYLSULFOXIDE
No full textOne Step Forward to "Stapled" Bis(phthalocyanine) Metal Complexes: Synthesis, Characterization, and Redox Properties of Bis(phthalocyaninato)niobium(IV). X-ray Crystal Structure of the Monoelectronically Oxidized Species [Pc2Nb](I3)(I2)0.5(ClNP)3.5 (ClNP = 1-Chloronaphtalene)
No full textBis(phthalocyaninato)niobium(IV) has been prepared and isolated as a monosolvate, [Pc2Nb]. CINP (CINP = 1-chloronaphthalene). It is a light-brown, stable-to-air Nb(IV) (d(1)) paramagnetic sandwich-like species, which, upon oxidation by It under mild conditions, undergoes a metal-centered monoelectronic oxidation to give the diamagnetic Nb(V) (d(0)) [PC2Nb](+) fragment, with formation of saltlike species of formula [Pc2Nb](I-3)(I-2)0.5(CINP)(3.5) (I). The structure of I has been elucidated by single-crystal X-ray work. Crystals are triclinic: formula C64H32N16Nb . I-3 . 0.5I(2) . 3.5C(10)H(7)Cl, M = 2194.8, a = 17.702(3) Angstrom, b = 18.708(3) Angstrom, c = 13.504(2)Angstrom, V = 4267.5(13) Angstrom(3), alpha = 106.00(2)degrees, beta = 93.39(2)degrees, gamma = 83.26(1)degrees, Z = 2, space group P (1) over bar. The structure of the [Pc2Nb](+) fragment, "stapled" by two inter-ligand C-C sigma bonds (C11A-C11B and C31A-C31B = 1.574(15) Angstrom), together with its color and UV-visible spectral behavior, allows a straightforward assignment of the same "stapled" structure to the unoxidized [Pc2Nb]. The present niobium sandwiched materials reiterate the peculiar structural findings shown only by the previously reported [Pc2Ti]
EQUILIBRIUM AND KINETIC-STUDY OF PYRIDINE BINDING TO PHTHALOCYANINATOIRON(II) IN DIMETHYL-SULFOXIDE
No full textDetermination of nitric oxide solubility in different solvents via the reaction with phthalocyaninatoiron(II)
No full textVariations 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
Homo/Heteropentanuclear Porphyrazine MgII, ZnII, and PdIIMacrocycles with Externally Pending PdCl2and Pd(CBT)2Units: Synthesis, Physicochemical Characterization, and Photoactivity Studies
No full textRecent work has been developed on two new classes of neutral porphyrazine complexes of formulas [(PdCl2)4Py8PzM]·xH2O (Py8Pz = octakis(2-pyridyl)porphyrazinato anion; M = MgII(H2O), ZnII, PdII) and [{Pd(CBT)2}4Py8PzM]·xH2O (M = MgII(H2O), ZnII CBT = m-carborane-1-thiolate anion). Characterization of all the species has been conducted by IR and UV-visible spectral measurements in a systematic comparison with the corresponding already known mononuclear species [Py8PzM] (M = MgII(H2O), ZnII) and the mono-PdII analogue isolated and presented here for the first time. Comparison includes also the two parent classes of pentanuclear tetrapyrazinoporphyrazines having the more extended π-electron delocalized macrocyclic core Py8TPyzPz. The reported new classes of pentanuclear complexes behave as active photosensitizers in photodynamic therapy (PDT), and due to the high boron content of the CBT derivatives, perspectives for them are open of application in the field of bimodal PDT/BNCT (boron neutron capture therapy) anticancer treatments
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
- …
