1,721,166 research outputs found
Bootstrap Technique for Analyzing Energy Data from PV Plant
No full textA resampling method, so-called bootstrap, is proposed for monitoring the energy efficiency of PV plants. It is able to approximately describe the sampling distribution and its peculiarity consists in taking preliminary information about the population of the data, whichever its distribution is. The paper proposes the application of the bootstrap technique on the energy dataset of a real photovoltaic plant located in Italy. The proposed technique represents an upgrade for a specific part of some monitoring procedures of PV plants
ASCORBIC ACID, ASCORBATE PEROXIDASE, AND H2O2 IN FRESHLY HARVESTED FRUITS OF SWEET CHERRY LANDRACES OF CAMPANIA (ITALY)
No full textASCORBIC ACID, ASCORBATE PEROXIDASE, AND H2O2 IN FRESHLY
HARVESTED FRUITS OF SWEET CHERRY LANDRACES OF CAMPANIA
(ITALY)
MIRTO A., IANNUZZI F., VACCA F., WOODROW P., CARILLO P., FUGGI A.
Department of Environmental Biological and Pharmaceutical Sciences and Technologies, Second
University of Naples, Via A.Vivaldi 43, 81100 Caserta (Italy)
sweet cherry,vitamin C, ascorbate peroxidase, hydrogen peroxide,redox potential
Ascorbate (AsA) has a key role in many metabolic processes, regenerating other metabolites
like tocopherols from oxidative damages and protect many enzymes from irreversible inactivation
by oxidation mainly caused by the oxidative stress. It is among the main component of the redox
homeostasis buffering mechanism (ascorbate - glutathione cycle and is involved in many redox
signalling processes. Ascorbate peroxidase (APX) as enzyme of the ascorbate-glutathione cycle
uses ascorbate as electron donor to scavenge hydrogen peroxide (H2O2) produced in normal and
stress enhanced aerobic metabolism. (Ascorbate (vitamin C) is essential for human health and its
main dietary source are plant-derived foods. In addition high level of ascorbate in fruits and
vegetables improve their post-harvesting storage properties.
In the aim of conservation and valorization of agro-biodiversity of sweet cherry germoplasm
of Campania (Italy) a study has been conducted to measure AsA, dehydroascorbate (DHA) and
hydrogen peroxide (H2O2) contents, as well as APX activities in the harvested fruits. The redox
state of the fruits was also evaluated.
Freshly harvested fruits from 23 landraces cultivated at the Regione Campania – Improsta
farm were used for the analyses.
The sweet cherry fruit extracts of the landraces varied significantly in contents of AsA and
DHA as well as in the DHA/AsA ratio. The redox potential showed the lowest value in the extracts
from the “Patanara” and “Lauretana” ones that did not show particularly high contents of AsA. The
highest potential was found in those from “Melella” and “Tamburella” that had relatively low AsA
content. Extracts from “Melella” were among those with the highest APX activity, while those
from “Tamburella” were from those with the lowest APX activity, as were also the extract from
Lauretana. The H2O2 contents also were not simply related to AsA content, APX activity and redox
potential, in agreement with the view that ascorbate concentration is dependent on biosynthesis,
catabolism and recycling. Anyway as considering that the oxidative stress in postharvest increase it
can be suggested that fruits with the lowest redox potential closer to the physiological one, at the
harvest,contains the overall most efficient antioxidant system and may be more suitable for postharvest
storage.
The work was funded by "Regione Campania, PSR 2007/2013, Measure 214, Action f2,
project “Agrigenet"
Analisi di sensitività per circuiti trifasi di elettronica di potenza con la tecnica della rete aggiunta
No full textThe transcultural identity of Batik in the relationship among craft, art and design
Full text linkThe paper aims at illustrating a research carried out within the Design Department, Politecnico di Milano in the Design for Cultural Heritage field. The research studies the multicultural and transcultural elements of the Batik technique in the textile field and proposes a methodological tool in order to foster an intercultural communication and use. The paper will be divided into two parts. The first one about the role of the design discipline as a facilitator of innovation in transcultural processes. The second one about the methodology of the research. The method is focused on four steps: 1) the state of art of the transcultural routes of Batik (Netherland, Africa....) and cross-fertilization paths (from craftsmanship to industry, from art to design); 2) the collection of case studies where artists and designers re-interpret Batik; 3) the creation of a thematic tool: a critical, dynamic and digital archive with which curators, designers and artists can find data about Batik (in terms of patterns, techniques and so on) and can use it in order to trigger new concepts and transcultural contaminations; and 4) the creative workshop (with artists and designers) where verifying this tool that was used in order to develop experimental interpretations of Batik in different kinds of products
An Alternative Approach to Parallel A/D Conversion
No full textA functional diagram of a novel type of A/D converter, described as bit oriented, for high-speed application is discussed. Although the system can be regarded as the natural development of the well-known flash ADC, a different approach to the conversion process has led to a reduction in the number of comparators required, with no loss in flash performances. There is also no need for sample and hold (S/H) and digital circuits for the coding. A comparison with the most up-to-date high conversion techniques (subranging, folding and interpolation) points out the advantages of the techniqu
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