1,721,128 research outputs found
BOOK OF ABSTRACTS, INSTM-9, 9th National Conference of the consorzio Inter-universitario Nazionale Scienza e Tecnologia dei Materiali, INSTM
No full textAdvanced materials & green processes for a sustainable society (INSTM Sestriere 2022)
No full textThis virtual special issue gathers a selection of articles following contributions presented at the XIII INSTM Conference on Materials Science and Technology, the yearly event that gathers the national community, which was held at the Olympic Village TH Hotel in Sestriere (Torino, Italy), built for the 2006 Winter Games, with panoramic views toward one of the most famous Europe's skiing resorts on the mountains of the north-west side of Italy
Low-temperature specific heat of Fe-6 and Fe-10 molecular magnets
No full textThe energy splitting of the low-lying levels has been investigated on two magnetic molecular clusters Fe-6 and Fe-10 by means of low-temperature zero-field specific-heat measurements. Significant deviations from the usual C similar to T-2 law were observed above the maximum of the main Schottky anomalies as a result of nonnegligible contributions from the excited spin states with S>1 and the estimated lattice contributions follow a phenomenological power law C/R similar to T-alpha with alpha-2.7 for both these compounds. The singlet-triplet energy gaps evaluated by the Schottky anomaly, T-0=19.2 K for Fe6 and 4.56 K for Fe-10, are smaller than what we can estimate by a simplified spin-Hamiltonian approach in the strong exchange approximation and using the energy levels obtained by the high-field magnetization and susceptibility measurements. This discrepancy asks for a more complex description of the low-lying states of these molecular clusters, beyond the strong exchange approximation. At very low temperatures T<<1 K, two low-energy Schottky anomalies were also observed in Fe-10, probably due to a small fraction of defected rings or to hyperfine contributions
Magnetic and redox properties in hydroxo- and alkoxo-bridged Fe(III) binuclear complexes: A density functional study
No full textDFT calculations were carried out in order to deduce the dependence of magnetic coupling on the structure of doubly hydroxide/alkoxide-bridged diiron(III) dimers. The broken-symmetry formalism was employed to calculate the magnetic exchange parameter J. The potential surfaces of the ground state display a geometrical minimum at an Fe[BOND]O(H)[BOND]Fe angle of 105° and Fe Fe distance of 3.2 Å, in good agreement with experimental values. The calculated correlation between the magnetic coupling with the geometrical structure agrees well with the experimental literature data, although always overestimated. Electrochemical measurements show that a one-electron reduction is likely to cause dissociation into pseudooctahedral, monomeric subunits, and, consequently, no calculations were made for the reduced dimeric specie
Antibacterial activity of essential oils against streptococci and staphylococci causing bovine mastitis
Full text linkBovine mastitis is a major concern for the dairy cattle community worldwide, leading to high economic
loss (Gomes et al., 2016). Mastitis, subclinical or clinical, can be caused by contagious or environmental
pathogens. Although the use of antibiotics is still the primary approach for treatment, its efficacy is limited.
Moreover, the development of antimicrobial resistance (AMR) leads to the need for alternatives to antibiotic
therapy (Yang et al., 2019). Due to their antibacterial effects, essential oils (EOs) have gained much attention
in this field as candidates to fight against bacterial infections and control further development of AMR
(Arbab et al., 2022).
This research aimed at testing the antibacterial activity of eleven EOs and two EO blends against Streptococcus
agalactiae, Streptococcus dysgalactiae, Streptococcus uberis, Staphylococcus aureus and Staphylococcus
epidermidis, by evaluating the minimum inhibitory concentration (MIC) and the minimum bactericidal
concentration (MBC), using microbroth dilution assay. The MIC values of the EOs tested ranged between
<0.001% and >3.125% v/v. The effect was higher against Streptococcus spp than Staphylococcus spp bacteria
in general. The EOs of Origanum vulgare, Cinnamomum zeylanicum, Thymus vulgaris, and Blend BR were
the most effective against S. agalactiae, S. dysgalactiae, and S. uberis showing MIC and MBC values between
<0.001% and 0.390% v/v, and <0.001% and 0.780% v/v, respectively. Against S. aureus and S. epidermidis, the
lowest MICs occurred with Cinnamomum zeylanicum: 0.098% and 0.195% v/v, respectively.
This study highlights the importance of evaluating EOs as effective antibiotic alternatives and complementary
resources for treatment of bacterial infections
Lumped Parameters Robot Models to Study Impact Dynamics
Full text linkIn the field of collaborative robotics, safety standards are crucial. Collision prevention, in collaborative scenarios, requires a targeted examination of impact dynamics. This paper addresses collision challenges by introducing simplified lumped parameter models that are not widespread in the robotic field. The proposed method is simpler than traditional methods (Newton-Euler or Lagrange formulations), but maintains accuracy in the prediction of the dynamic quantities relevant to impacts (linear momentum and kinetic energy). The study chiefly deals with 2D robots, including the case of off-center centers of mass (CoM), but some hints about the modeling of 3D robots are given. MATLAB simulations and experimental tests with a robot confirm the validity of the proposed method
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
Variations 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
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
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