Non-Markovian dissipative dynamics of two coupled qubits in independent reservoirs: a comparison between exact solutions and master equation approaches

The reduced dynamics of two interacting qubits coupled to two independent bosonic baths is investigated. The one-excitation dynamics is derived and compared with that based on the resolution of appropriate non-Markovian master equations. The Nakajima-Zwanzig and the time-convolutionless projection operator techniques are exploited to provide a description of the non-Markovian features of the dynamics of the two-qubits system. The validity of such approximate methods and their range of validity in correspondence to different choices of the parameters describing the system are brought to light.Comment: 6 pages, 3 figures. Submitted to PR

A ricardian analysis of the impact of climate change on permanent crops in a mediterranean region

This is the first study which explores the impact of climate change in Sicily, a small Mediterranean region of Southern Europe. According to research, Mediterranean area has shown large climate shifts in the last century and it has been identified as one of the most prominent “Hot-Spots” in future climate change projections. Since agriculture is an economic activity which strongly depends on climate setting and is particularly responsive to climate changes, it is important to understand how such changes may affect agricultural profitability in the Mediterranean region. The aim of the present study is to assess the expected impact of climate change on permanent crops cultivated in Sicilian region (Southern Italy). By using data from Farm Accountancy Data Network and Ensembles climatic projections for 2021-2050 period, we showed that the impact of climate change is prominent in this region. However, crops respond to climatic variations in a different manner, highlighting that unlike the strong reduction in profitability of grapevine and citrus tree, the predicted average Net Revenue of olive tree is almost the same as in the reference period (1961-1990)

On the validity of non-Markovian master equation approaches for the entanglement dynamics of two-qubit systems

In the framework of the dissipative dynamics of coupled qubits interacting with independent reservoirs, a comparison between non-Markovian master equation techniques and an exact solution is presented here. We study various regimes in order to find the limits of validity of the Nakajima\u2013Zwanzig and the time-convolutionless master equations in the description of the entanglement dynamics. A comparison between the performances of the concurrence and the negativity as entanglement measures for the system under study is also presented

Good, Safe and Fair: Quality Perception and Consumer Demand of Locally Produced Beef in Southern Italy

The increasing concern amongst consumers regarding the safety and quality of the beef that they buy is the result of food scares that have characterized the beef market in the last two decades. These scares, together with environmental and ethical concerns, caused consumers to reflect upon the quality of the beef they eat. The aim of this paper is to identify which quality characteristics influence the incidence of local beef consumption on the total consumption of beef. It is assumed in this study that such choice is a response to a process of quality evaluation, which occurs combining specific quality attributes and socially constructed food quality criteria strictly linked to a socially fair dimension of local productions. Consumers who habitually purchase local beef at the butcher shops were the focus of our empirical strategy. Data were collected by administering a face-to-face questionnaire to 160 consumers in Sicily (Southern Italy), right after their purchases at the butcher shops. The results of this study suggest some implications in defining locally produced beef quality, making more accurate strategies possible when supporting the spread of production and consumption of beef at the local level.La pr\ue9occupation croissante des consommateurs \ue0 l'\ue9gard de la salubrit\ue9 et de la qualit\ue9 de la viande bovine qu'ils ach\ue8tent est le r\ue9sultat des crises alimentaires qui ont caract\ue9ris\ue9 le march\ue9 de la viande bovine ces deux derni\ue8res d\ue9cennies. Ces craintes, s\u2019ajoutant aux pr\ue9occupations environnementales et \ue9thiques, ont amen\ue9 les consommateurs \ue0 r\ue9fl\ue9chir \ue0 la qualit\ue9 de la viande qu\u2019ils consomment. Le but de cet article est d'identifier les caract\ue9ristiques de qualit\ue9 qui influencent l'incidence de la consommation de viande bovine locale sur la consommation totale de viande bovine. Dans cette \ue9tude, nous avan\ue7ons qu\u2019un tel choix est une r\ue9ponse \ue0 un processus d'\ue9valuation de la qualit\ue9 qui combine attributs de qualit\ue9 sp\ue9cifiques et crit\ue8res de qualit\ue9 alimentaire construits socialement, strictement li\ue9s \ue0 une dimension socialement \ue9quitable des productions locales. Nous avons focalis\ue9 notre strat\ue9gie empirique sur les consommateurs ayant l\u2019habitude d\u2019acheter de la viande locale dans les boucheries. Les donn\ue9es ont \ue9t\ue9 collect\ue9es \ue0 l\u2019aide d\u2019un sondage direct aupr\ue8s de 160 consommateurs en Sicile (Sud de l'Italie), juste apr\ue8s leur achat dans les boucheries. Les r\ue9sultats de cette \ue9tude sugg\ue8rent certaines implications dans la d\ue9finition de la qualit\ue9 de la viande bovine produite localement, permettant d\u2019\ue9tablir des strat\ue9gies plus pr\ue9cises pour soutenir l\u2019expansion de la production et la consommation de viande bovine \ue0 l\u2019\ue9chelle locale

Long-Term Safety of Anti-TNF Adalimumab in HBc Antibody-Positive Psoriatic Arthritis Patients: A Retrospective Case Series of 8 Patients

Immunosuppressive drugs commonly used in the treatment of psoriatic arthritis make patients more susceptible to viral, bacterial, and fungal infections because of their mechanism of action. They not only increase the risk of new infections but also act altering the natural course of preexisting infections. While numerous data regarding the reactivation of tuberculosis infection are available in the literature, poor information about the risk of reactivation or exacerbation of hepatitis viruses B and C infections during treatment with biologics has been reported. Furthermore, reported series with biological therapy included short periods of followup, and therefore, they are not adequate to verify the risk of reactivation in the long-term treatment. Our study evaluated patients with a history of hepatitis B and psoriatic arthritis treated with adalimumab and monitored up to six years. During the observation period, treatment was effective and well tolerated in all patients, and liver function tests and viral load levels remained unchanged

Beam Spot Position Measurement at the LEP Collider

A precise knowledge of the beam spot position is required for many physics topics at LEP2. The movement of the beam spot is studied at LEP1 using beam orbit monitors close to the interaction points and compared with measurements from tracks produced in e+e- collisions. The beam orbit monitors are found to follow the beam spot position well, particularly when corrected for movements of nearby quadrupole magnets. Data from the LEP high energy run of November 1995 are also analysed, and projections made for the prospects at LEP2

Effects of pet exposure in the first year of life on respiratory and allergic symptoms in 7-yr-old children. The SIDRIA-2 study

The effects of pet exposure on the development of respiratory symptoms have recently been the matter of vivid discussion. Our objective was to determine the effects of exposure to cat or dog in the first year of life on subsequent respiratory/allergic symptoms in children in a large Italian multicentre study. As part of the SIDRIA-2 Study (Studi Italiani sui Disturbi Respiratori dell'Infanzia e l'Ambiente 2002), the parents of 20016 children (median age 7 yr) provided information on indoor exposures at different times in life and respiratory/allergic symptoms through questionnaires. Logistic regression analyses were performed taking into account cat or dog exposure at different times in life and adjusting for the presence of the other pet, mould exposure, gender, age, parental education, maternal smoking during the first year of life, current passive smoking, family history of asthma/rhinitis/eczema and other potential confounders. Neither significant effects of dog exposure in the first year of life nor in other periods were found on respiratory/allergic symptoms after adjusting for the other covariates. Cat exposure in the first year of life was significantly and independently associated with current wheezing [OR (95% CI) 1.88 (1.33-2.68), p < 0.001] and current asthma [1.74 (1.10-2.78), p < 0.05] and border-line associated with current rhinoconjunctivitis [1.43 (0.97-2.11), p = 0.07]. No other effects of cat exposure were found on respiratory/allergic symptoms. Cat, but not dog, exposure in the first year of life is an independent risk factor for current wheezing, current asthma and current rhinoconjunctivitis at the age of 7

BMQ

BMQ: Boston Medical Quarterly was published from 1950-1966 by the Boston University School of Medicine and the Massachusetts Memorial Hospitals. Pages 49-52, v17n2, provided courtesy of Howard Gotlieb Archival Research Center

Proceedings of the Workshop on Monte Carlo's, Physics and Simulations at the LHC PART II

These proceedings collect the presentations given at the first three meetings of the INFN "Workshop on Monte Carlo's, Physics and Simulations at the LHC", held at the Frascati National Laboratories in 2006. The first part of these proceedings contains pedagogical introductions to several basic topics of both theoretical and experimental high pT LHC physics. The second part collects more specialised presentations.Comment: 157 pages, 136 figures; contribution by M. Grazzini has been adde