Search results for "HEE"

Microwave electrodynamics of the antiferromagnetic superconductor GdBa2Cu3O7−δ

1999

The temperature dependence of the microwave surface impedance and conductivity are used to study the pairing symmetry and properties of cuprate superconductors. However, the superconducting properties can be hidden by the effects of paramagnetism and antiferromagnetic long-range order in the cuprates. To address this issue we have investigated the microwave electrodynamics of GdBa_2Cu_3O_{7-\delta}, a rare-earth cuprate superconductor which shows long-range ordered antiferromagnetism below T_N=2.2 K, the Neel temperature of the Gd ion subsystem. We measured the temperature dependence of the surface resistance and surface reactance of c-axis oriented epitaxial thin films at 10.4, 14.7 and 17…

Microwave surface resistance of pristine and neutron-irradiated MgB2 samples in magnetic field

2008

We report on the microwave surface resistance of two polycrystalline Mg11B2 samples; one consists of pristine material, the other has been irradiated at very high neutron fluence. It has already been reported that in the strongly irradiated sample the two gaps merge into a single value. The mw surface resistance has been measured in the linear regime as a function of the temperature and the DC magnetic field, at increasing and decreasing fields. The results obtained in the strongly irradiated sample are quite well justified in the framework of a generalized Coffey and Clem model, in which we take into account the field distribution inside the sample due to the critical state. The results ob…

Organic nanosheets with charged surface: two dimensional self-assembly of a non-symmetric bis-acylurea with pyridyl end group

2011

We present a novel non-symmetric bis-acylurea that self-assembles into two dimensional nanosheet superstructures. The bis-acylurea (PyrC8Bn) has a pyridyl and a benzyl end group divided by a spacer group [–NHCONHCO–(CH2)8–CONHCONH–, C8] with two hydrogen bonding sites. Upon cooling a hot solution in ethanol, the molecule self-assembles into multilayered nanosheet structures due to the intermolecular biaxial hydrogen bonding. The surface charge of the nanosheets could be switched between positive and neutral by adjusting the pH. The charged character of the nanosheets was utilized in immobilizing negatively charged gold nanoparticles. An attempt to regulate the self-assembly allowed us to fi…

STUDY OF MASTITIS IN DAIRY SHEEP USING SURVIVAL ANALYSIS

2013

Mastitis is the most prevalent disease present in livestock species leading to economic loss. In dairy sheep, it caused mainly from bacterial infections. The aim of this work was to investigate the risk of having mastitis in Valle del Belice dairy ewes during the first lactation, due to environmental or contagious pathogens, using a survival analysis approach. All test‐day records from primiparous ewes were collected from five flocks. All test‐day were grouped in two data sets, one with mastitis due to environmental pathogens (ENV) and the other with mastitis due to contagious pathogens (CON). In this analysis the follow up period of a ewe was the lactation, consequently all the record bega…

Reshaping End-of-Life components by sheet hydroforming: An experimental and numerical analysis

2022

In this study, a numerical/experimental analysis is proposed to investigate the possibility of reshaping sheet metal-based End-of-Life (EoL) components using sheet Hydroforming (SHF). Returned EoL components are challenging to be reformed, they are usually characterised by high heterogeneity as there are localised thinning areas (caused by the original forming processes), and the overall formability is reduced with respect to the original flat sheet material. The reshaping route was replicated: a deep drawing process was adopted to impart a square feature; subsequently, SHF was performed. The capability of remove the deep drawn feature was analysed with varying Blank-holder force, oil press…

Energy and Resource efficient Forming Processes

2010

Introduction : spaces of upset in the Nordic region

2022

Abstract This introductory article opens the thematic issue Spaces of Upset in the Nordic Region. It introduces the contributions of the issue, outlines the concepts that unite them, and discusses the sociolinguistic area in which they are set: the Nordic region. Centering on Denmark, Finland and Sweden, the article offers an overview of some of the sociolinguistic, ideological and political characteristics of the region and the countries it comprises. The Nordic region is widely seen as a paradigm case of social stability, consensus and cohesion. This vision is, however, a mirage. To be sure, upset often lingers below the discursive veneer of Nordic harmony, concord and agreement. Breaking…

Assessment of soil particle erodibility and sediment trapping using check dams in small semi-arid catchments

2017

Check dams can be used as a source of information for studies on sediment characteristics and soil particle erodibility. In this study, sediment yield and grain size distribution (GSD) were measured in twenty small catchments draining into a rock check dam in NW Iran for different runoffs during 2010–2011. Significant correlations were found between sediment yield and slope steepness, vegetation cover and soil erodibility factor (K) of the catchments. The erodibility of soil particles was determined using the comparison of GSD between sediment and original soil. Clay was the most erodible soil particle which showed 2.05 times more percentage in sediment than the original soil. The erodibili…

Tick-borne pathogens in sheep and goats in Southern Italy

2010

Addition of pasture plant essential oil in milk: Influence on chemical and sensory properties of milk and cheese

2007

The aim of this experiment was to study the effect of the addition, to milk, of an essential oil (EO) obtained from the hydrodistillation of plants collected from a mountain natural pasture on the milk and cheese sensory properties. The EO was mainly composed of terpenoid compounds (67 of the 95 compounds identified) as well as ketones, aldehydes, alcohols, esters, alkanes, and benzenic compounds. In milk, the addition of this EO at the concentration of 0.1 microL/L did not influence its sensory properties, whereas at 1.0 microL/L, sensory properties were modified. In cheeses, the effect of adding EO into milk was studied in an experimental dairy plant allowing the production of small Canta…