1,721,249 research outputs found
Working conditions adopted and related compositional and organoleptic characteristics of the Tuscan sourdough bread
No full textThe traditional tuscan bread:biochemical, kinetic and microbiological evaluation of the production process of this typical product
No full textInfluence of Average Photon Energy index on solar irradiance characteristics and outdoor performance of photovoltaic modules
No full textSolar spectral irradiance measurements on a routinely basis are relevant to study the influence of solar spectrum on the photovoltaic (PV) module performance, especially for thin film and third generation PV. Two spectroradiometers from EKO were added to the instrumentation available at the ESTER outdoor station of the University of Rome Tor Vergata. A detailed characterisation of the spectral irradiance at the site was carried on during more than 6 months of monitoring activity measuring spectral solar irradiance in the range 350–1700 nm with a time interval of 10 min on a horizontal plane. A wide variety of spectra were acquired in various weather conditions, and indications about the spectra behaviour on a daily and seasonal basis were obtained. Moreover, information about the effect of the weather conditions on the solar radiation spectral distribution were identified. The Average Photon Energy index was used as an indicator of the spectra characteristics. The same index was also used to evidence the solar spectrum influence on polycrystalline and double junction amorphous silicon PV modules
Solar spectral irradiance measurements relevant to photovoltaic applications
Full text linkRecently, two spectroradiometers from EKO have been added to the instrumentation available
at the ESTER outdoor station of the University of Rome Tor Vergata, with the aim to
characterize the spectral irradiance at the site and evaluate its influence on the performances of
photovoltaic modules, especially thin films and third generation devices as Dye Sensitized
Solar Cells (DSSC). The paper will present the results of more than six months monitoring
activity where the spectral solar irradiance in the range 350 nm – 1,700 nm has been measured
continuously with a time interval of 10 minutes on a horizontal plane. A wide variety of spectra
have been acquired in various weather conditions and first indications about the spectra
behaviour on a daily and seasonal basis have been obtained. Moreover also some information
about the effect of the weather conditions on the solar radiation spectral distribution will be
presented
Characterization of yeasts and lactic acid bacteria from sourdoughs used to produce the traditional bread of Tuscany
No full text
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
The impact of different corona models on FD algorithms for the solution of multiconductor transmission lines equations
Full text linkIn this study, the implementation of different corona discharge models in a transient program for overhead multiconductor lines based on the implicit Crank-Nicolson Finite Difference Time Domain method is presented. Among different corona models available in the literature, two empirical models (Gary's and Suliciu's models) and a physics-based model (Malik's model) are discussed, which are broadly used in EMT programs, and their predictions under fast-front lightning surges and slow-front switching impulses are assessed. The authors critically review the dynamic capacitance approach in terms of numerical accuracy, when dealing with slowly varying voltages, and applicability, regarding dispersive models assuming a non-instantaneous charge-voltage relation. The alternative voltage-controlled generator approach is proposed, which is successfully included in the implicit Crank-Nicolson scheme. One of the objectives of this study is to show how different corona models may predict overvoltages with huge discrepancies, depending on the transient waveform and the propagation distance, despite the similarity of the q-v hysteresis curves. More evident discrepancies between models under fast-front voltage waves are reported, rather than for switching impulses. The consistency of these results in terms of the models' features and q-v curves is analysed, highlighting the necessity for new engineering tools for corona simulation of general predictive capability
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