Search results for " composition"

The silver collection of San Gennaro treasure (Neaples): A multivariate statistic approach applied to X-ray fluorescence data

2021

Abstract In this work we report an X-ray fluorescence spectroscopy (XRF) study combined with a multivariate approach allowing to detect compositional differences and similarities among the alloys used in realization of silver collection of San Gennaro items collection. The San Gennaro treasure in Naples (Italy) represents, in fact, one of the most important silver collections in the world. The classification of the collection items is very complex, not only for the large number of objects, but also in consideration that between 1600 and 1700, in Naples, more than 350 laboratories were active, most of them specialized in specific art of work. As a consequence, a given collection object could…

The relationship between attachment dimensions and perceptions of group relationships over time: An actor–partner interdependence analysis.

2016

A group member’s attachment, anxiety, and avoidance is related to how the group member and the other group members (OGMs) perceive group relationships. In addition, the collective attachment strategies of the OGMs may also be related to how the individual group member and the others perceive the relationships in the group. We extend previous research, using the actor partner interdependence model (APIM), to examine how group members’ and aggregated OGMs’ attachment anxiety and avoid- ance were related to group members’ and OGMs perceptions of positive bonding, positive working, and negative relationships measured early and late in interpersonal growth groups. Three hundred twenty-five Itali…

Sex composition and group climate: A group actor−partner interdependence analysis.

2013

There is a lack of research examining how the proportion of women and men in a group effects both the group member’s perception of group climate and the aggregated perceptions of group climate for the other group members. We adapted the group actor–partner interdependence model (GAPIM; Kenny & Garcia, 2012) to examine how the perception of the group’s climate by a group member and by the other group members are related to the group member’s sex and the sex of the other group members. In addition, we examined how similar the group member’s sex was to the sex of the other group members by analyzing the interaction between the two sex variables. A total of 110 Italian graduate students (96 wom…

Analysis of social performance and board of directors in family firms: evidence from quoted Italian companies

2013

'This is a very business-like book in its approach. It has an impressive global reach in its authorship, focal areas and use of evidence; it hits all the major practical challenges of family firms in a spirit that is fresh and current; and it deals with the cutting-edge themes and issues that are uppermost in the minds of owners, executives, advisors and researchers in the field.' - Nigel Nicholson, London Business School, UK, author, Managing the Human Animal, Family Wars and The 'I' of Leadership. © Kosmas X. Smyrnios, Panikkos Zata Poutziouris and Sanjay Goel 2013. All rights reserved.

FTIR Monitoring of Chemical Changes in Softwood During Heating

2000

Abstract A multivariate chemometric method for monitoring the mass loss of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) by IR spectroscopic determination of chemical changes occurring during the heat treatment (160 - 260 °C, 2 - 8 h) of these wood materials was developed. The method was based on the handling of FTIR data on treated and untreated wood powder samples by the partial least squares (PLS) method. In addition, unknown samples (treated and untreated pine and spruce) were classified into separate groups by the principal component analysis (PCA) method. The chemical changes occurring in the wood samples during heating were also briefly discussed.

Thermochemical behavior of Norway spruce ( Picea abies ) at 180-225 °C

2002

Norway spruce (Picea abies) was heated for 2–8 h in the temperature range 180–225 °C, under a steam atmosphere. The chemical analyses of the treated feedstock samples indicated that during heating (total mass loss 1.5–12.5% of the initial DS) carbohydrates (hemicelluloses and cellulose) were clearly more amenable to various degradation reactions than lignin. In addition, major water-soluble products released from the feedstock material during the treatments were classified into several compound groups and changes in the relative mass portion of these groups were monitored by GC during a separate experiment.

Diffuse and focused carbon dioxide and methane emissions from the Sousaki geothermal system, Greece

2006

[1] We report first data on chemical composition of the gas emitted by the geothermal system of Sousaki, Greece. Gas manifestations display typical geothermal gas composition with CO2 as the main component and CH4 and H2S as minor species. Soil gas composition derives from the mixing of two end-members (atmospheric air and geothermal gas). Soil CO2 fluxes range from<2 to 33,400 g m−2 d−1. The estimated diffuse output of hydrothermal CO2, estimated for an area of 0.015 km2, is about 630 g s−1, while a tentative estimation of CH4 diffuse output gave a value of about 1.15 g s−1. Point sources accounted for lower flux values of ∼26 g s−1 of CO2, ∼0.1 g s−1 of CH4 and ∼0.02 g s−1 of H2S.

Geographical variation of land mineral composition

2015

Morphogenetic characteristics of chernozem leached in mining enterprises pollution conditions

2019

The article presents the results of comparative studies on the uncontaminated (virgin) leached chernozem soil in terms of heavy metal contamination due to zinc plant operations. Study object location is given. The territory under the influence of plant emissions is devoid of vegetation. Everywhere on the soil surface there are manifestations of deep erosion processes and continuous erosion of the topsoil. Soil cuts with morphogenetic descriptions, physical, physico-chemical and biological characteristics of the soil were laid at the objects. The soil cover under the influence of pollution has undergone degradation and led to transformational processes of particle size distribution, humus co…

Dynamics and spectra of composition operators on the Schwartz space

2017

[EN] In this paper we study the dynamics of the composition operators defined in the Schwartz space of rapidly decreasing functions. We prove that such an operator is never supercyclic and, for monotonic symbols, it is power bounded only in trivial cases. For a polynomial symbol ¿ of degree greater than one we show that the operator is mean ergodic if and only if it is power bounded and this is the case when ¿ has even degree and lacks fixed points. We also discuss the spectrum of composition operators.