On the Wilson-Bappu relationship in the Mg II k line

An investigation is carried out on the Wilson-Bappu effect in the Mg II k line at 2796.34 A. The work is based on a selection of 230 stars observed by both the IUE and HIPPARCOS satellites, covering a wide range of spectral type and absolute visual magnitudes. The Wilson-Bappu relationship here provided is considered to represent an improvement over previous recent results for the considerably larger data sample used as well as for a proper consideration of the measurement errors. No evidence has been found for a possible dependence of the WB effect on stellar metallicity and effective temperature.Comment: 8 pages, 8 figures Accepted for publication on A&

La coltivazione del grano tenero in Sicilia: prime valutazioni economiche

The Sicilian 2007-2013 Rural Development Program of Sicily, by the measure 1.2.3 "Enhance of the added value of agricultural and forestry products", created the conditions for the conclusion of supply contracts between a milling company and 18 Sicilian farmers who are committed to annually grow about 600 hectares of common wheat in 2010-2013. With reference to the years 2010-2012, a survey was conducted using data collected from 4 of the 18 grain farms involved in the initiative that have grown in this period both durum and common wheat, in order to quantify the key economic parameters and to allow an initial comparison. The evaluation showed interesting results for the common wheat both from the point of view of production (average yield of 47,7 q/ha), and in terms of the gross salable production (average 1.606 €/ha). The most significant economic parameters to evaluate the productive outcome, such as EBITDA and net, average resulted respectively 859 and 444 €/ha, about 100 €/ha more than what has been recorded for durum wheat; also the unit cost of production for the common wheat grain was significantly lower than that of durum wheat (-13%)

A study of the Mg II 2796.34 A emission line in late--type normal, and RS CVn stars

We carry out an analysis of the Mg II 2796.34 A emission line in RS CVn stars and make a comparison with the normal stars studied in a previous paper (Paper I). The sample of RS CVn stars consists of 34 objects with known HIPPARCOS parallaxes and observed at high resolution with IUE. We confirm that RS CVn stars tend to possess wider Mg II lines than normal stars having the same absolute visual magnitude. However, we could not find any correlation between the logarithmic line width log Wo and the absolute visual magnitude Mv (the Wilson--Bappu relationship) for these active stars, contrary to the case of normal stars addressed in Paper I. On the contrary, we find that a strong correlation exists in the (Mv, log L) plane (L is the absolute flux in the line). In this plane, normal and RS CVn stars are distributed along two nearly parallel straight lines with RS CVn stars being systematically brighter by about 1 dex. Such a diagram provides an interesting tool to discriminate active from normal stars. We finally analyse the distribution of RS CVn and of normal stars in the (log L, log Wo) plane, and find a strong linear correlation for normal stars, which can be used for distance determinations.Comment: 10 pages, 7 figures, latex, to be published in A&

A one dimensional model for the prediction of extraction yields in a two phases modified twin-screw extruder

Solid/liquid extraction is performed on raw plant substrate with a modified twin-screw extruder (TSE) used as a thermo-mecanochemical reactor. Visual observations and experimental residence time distributions (RTD) are used to develop a solid transport model based on classical chemical engineering method. Modeled and experimental residence times are compared. The transport model is then coupled with a reactive extraction model in order to predict extraction yields

Quality Factors Influencing Consumer Demand for Small Fruit by Focus Group and Sensory Test

The market of berries is a niche of high value in Italy. Small fruit\u2019s healthy properties are well known in the international market, but little is known about the reason for a low commercialization rate of fresh small fruit in Italy. The objective of this study was to assess consumer preferences in Italy for selected berry species. Moreover, the study aims to identify the relevant attributes of berries that affect the demand for this produce according to consumers and to compare these attributes. We assessed relevant attributes affecting the demand for fresh berries for different consumers\u2019 profiles and compared berries\u2019 attributes rankings. The results reveal high concordance between blackberries and raspberries; price is the attribute that constrains more purchases because it is deemed too high. Consumers prefer small fruit because of the rising interest in their nutraceutical value, and they have a higher willingness to pay because of this important attribute

Two phase residence time distribution in a modified twin screw extruder

Biomass fractionation is performed with a modified Clextral twin-screw extruder used as a thermo-mechano-chemical reactor. This new process is firstly analyzed. Visual observations, residence time distributions, and global mass balances are used to obtain information about the process phenomena and their coupling. Residence time distributions (RTD) classical models are adopted to represent the experimental plots. The influence of continuous and discrete process parameters upon the RTD of the solid and liquid phases is analyzed

Importance of food labeling as a means of information and traceability according to consumers

Consumption patterns have considerably changed over recent years. We are witnessing more and more frequently to a lack of information (i.e. information asymmetry) between food producers and consumers, this generate in the consumer the latter need to access information related to processes of production of food and food distribution. Decisionmaking, in absence of further information, leads consumers to pay attention to food labeling. Food labels become the only tool for consumers to acquire additional information about products in order to make the purchase decision. In today’s modern and globalized market, labels limitations can be partially overcome by using Mobile Marketing tools, such as the QR Code (Quick Response Code). Therefore the objective of this study is: (1) categorize profiles of consumers according to the importance given to various information patterns shown on food labeling; (2) discover consumer behaviors when making a purchasing decision based on food information they require in the label; (3) discover consumer profiles with regards to food quality and the use QR Code to acquire further information about food products. Two Italian regional capitals were chosen, as representative of Northern and Southern Italy, basing on the geographical division of the Country made by the ISTAT (Istituto Nazionale di Statistica). The interviews were carried out by telephone, using a questionnaire. Data collected were processed by Multidimensional Scaling We discovered eight profiles of consumers with different purchasing behaviors. Some consumer profiles, with lifestyles typical of contemporary life, use the QR Code to obtain additional information about food products. The innovative purchasing behavior identifies a consumer who is particularly interested in food quality and safety. Agri-food businesses that focus on quality productions could target the innovative profile and communicate further information trough the use of modern communication technologies

Hard X-ray emission from Eta Carinae

Context : If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and gamma-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected. Aims : To detect this emission, observations of Eta Carinae were performed with INTEGRAL, leveraging its high spatial resolution. Methods : Deep hard X-ray images of the region of Eta Car were constructed in several energy bands. Results : The hard X-ray emission previously detected by BeppoSax around Eta Car originates from at least 3 different point sources. The emission of Eta Car itself can be isolated for the first time, and its spectrum unambiguously analyzed. The X-ray emission of Eta Car in the 22-100 keV energy range is very hard (photon index around 1) and its luminosity is 7E33 erg/s. Conclusions : The observed emission is in agreement with the predictions of inverse Compton models, and corresponds to about 0.1% of the energy available in the wind collision. Eta Car is expected to be detected in the GeV energy range.Comment: 5 pages with 2 figures. Accepted as a Letter in Astronomy & Astrophysic

Mid-Cycle Changes in Eta Carinae

In late 2006, ground-based photometry of $\eta$ Car plus the Homunculus showed an unexpected decrease in its integrated apparent brightness, an apparent reversal of its long-term brightening. Subsequent HST/WFPC2 photometry of the central star in the near-UV showed that this was not a simple reversal. This multi-wavelength photometry did not support increased extinction by dust as the explanation for the decrease in brightness. A spectrum obtained with GMOS on the Gemini-South telescope, revealed subtle changes mid-way in $\eta$ Car's 5.5 yr spectroscopic cycle 0when compared with HST/STIS spectra at the same phase in the cycle. At mid-cycle the secondary star is 20--30 AU from the primary. We suggest that the spectroscopic changes are consistent with fluctuations in the density and velocity of the primary star's wind, unrelated to the 5.5 yr cycle but possibly related to its latitude-dependent morphology. We also discuss subtle effects that must be taken into account when comparing ground-based and HST/STIS spectra.Comment: 34 pages, 9 Figure