1,721,242 research outputs found
Mechanical spectroscopy applications for investigating metallurgical processes
No full textMechanical Spectroscopy provides information on microstructural features of materials not
obtained by other techniques. In general, it is used for investigating physical phenomena, however it
can be very useful also for solving problems related to industrial processes. This work describes and
discusses some applications of metallurgical interest
Statistical characterization of the ship as a source of noise by means of acoustic range surveys
No full textIn the present work the main problems regarding the experimental characterízation of the ship as a source of noise are overviewed. A number of surveys carried out at an acoustic range are studied by means of different regression analyses in order to find the best correspondance wlth the measured values.
The investigation is performed with the aim of determining and quantifing the influence of various physical parameters involved in noise propagation in water: (distance, transverse angular position, water depth, difference between the direct and the surface-reflected path).
The model derived from the regression analysis is utilized to solve the practical problen of referring the noise surveys at an acoustical range to the conventional distance of one metre: a comparison is presented with the results obtained using other methodologies based on simple mathematical models or on experimental transnission losses
Combining Top-Down And Bottom-Up Approach: The Morphing Characteristics Of The Territorial Governance
No full text
Stress Relaxation and the Relaxation Spectrum of Metallic Glasses
No full textAbstract
The anelastic stress relaxation is measured at room temperature on amorphous alloys of different chemical composition obtained by melt spinning. It is found that the load relaxation vs. time behavior depends considerably on the strain rate at which the samples are anelastically deformed at a fixed strain before the relaxation tests. It is suggested that it is possible, in principle, by performing stress relaxation tests after loading the specimens in a wide range of strain rates, to obtain indications of the activation energy spectrum for relaxation and of the dependence on the strain rate of the characteristic relaxation times of the shear processes (two level systems), responsible for anelasticity
The internal friction peaks in YBa2Cu3O6+x above room temperature Mark the phase transformations of the system
No full textThe YBa2Cu3O6+x system exhibits internal friction peaks above room temperature. These peaks are thermally activated. When the system is fully oxygenated (x=1), one peak only is detected. At a lower oxygen content, x<0.8, this peak change in shape and position and a new one can be contemporarily detected. These peaks are reasonably linked with the crystal phases of the system. We present a sequence of measures taken on the same sample, where the evolution of these peaks is shown
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
Off-stoichiometric superconducting phases, oxygen mobility and anelastic relaxation in YBa2Cu3O7−x
No full textAbstract
Elastic energy dissipation measurements were carried out using the vibrating reed and torsional pendulum techniques on polycrystalline YBa2Cu3O7-x specimens in different stoichiometric conditions. In the 300–900 K range two relaxational damping peaks, PO1 and PO2, can be observed. The relaxation strength depends considerably on the oxygen deficiency x. As the value of x increases, the intensity of peak PO1 decreases while that of PO2 increases. The two relaxation processes have activation energies H1=(1.54±0.09) eV and H2=(1.3±0.1) eV, respectively. Models for the relaxation involving the dynamics of oxygen atoms in the Cu-O basal plane and along the twinned interfaces are examined
Communication patterns to address the consumption of PDO products
No full textPurpose – The purpose of this paper is to identify the communication patterns adopted by special organisations, called Producers’ Consortia, to promote Protected Designation of Origin (PDO) products. In particular, the paper analyses the key differences among the communication patterns in terms of the task assigned to communication, the communication tools employed to convey key messages to customers and the amount of the budget allocated to the mix of communication. Design/methodology/approach – The authors analysed the communication activities conducted by all the Italian Consortia (112 in total) over a period of four years. A centred log-ratio transformation (clr) was applied to make the compositional data treatable in the Euclidean space. A clustering procedure was then followed to identify the different communication patterns adopted by the Consortia. The authors adopted an analytical framework where different communication patterns of Consortia are identified by the mostly used types (traditional advertising, public relations and digital communication) and the corresponding aimed consumer response (i.e. awareness, attitude and engagement). Findings – This paper identifies four relevant and different communication patterns that co-exist in the Italian PDO market. Each pattern responds to a different logic and focusses on a specific task assigned to communication: to increase the awareness of the PDO label, to improve the attitude towards the PDO products and to enhance the engagement with the PDO’s values. Research limitations/implications – PDO products are key assets of a growing relevance for the European agri-food industry and consumer education is at the very core of the PDO labelling system. By law, the Consortia are in charge of the crucial task of communicating to customers. This research suggests that the communication of PDO is a complex activity that requires a careful choice of the right communication mix. Different patterns are driven by specific logic and are suitable for Consortia with different characteristics. Future research could complete the results of this study using a qualitative analysis of the content of communication activities. Caution should be used when generalising these findings to markets that present relevant differences in consumer food culture. Practical implications – This research identifies some possible communication mixes that managers of the Consortia can adopt to promote PDO products and some options that can guide the development of their communication activities over time. Originality/value – This work adds value to the literature on food marketing, and more specifically on food communication, by analysing the yet underexplored issue of how PDO products can be promoted in the “post-modern” food consumption era
ORTHORHOMBIC TO TETRAGONAL PHASE-TRANSITION IN YBA2CU3O7-X OBSERVED BY DYNAMIC YOUNGS MODULUS MEASUREMENTS
No full textDynamic Young's modulus measurements, have been performed by the vibrating reed technique (10(2)-10(4) Hz) on polycrystalline YBa2Cu3O7-x samples in the temperature range 300-900 K. A strong modulus softening, indicative of a phase transition, is measured at about x = 0.45. DTG measurements versus temperature show in correspondence a maximum in the oxygen desorption rate. Long time modulus isotherms display an exponential trend linked to a thermally activated structural process with activation energy H = 0.9 +/- 0.1 eV. On the basis of the experimental results a model for the structural transformation linked to the twinned interfaces mobility and to oxygen diffusion is presented and discussed
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