7,943 research outputs found

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

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    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

    Data Note: State Trends in the Vocational Rehabilitation Engagement of Young Adults with Intellectual Disabilities: 2002-2011

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    Experiencing paid employment during and immediately after high school is a critical step on the path toward economic self-sufficiency in adulthood. Young adults with disabilities interested in gaining employment experiences may seek support from vocational rehabilitation (VR) programs. In this Data Note, we examine the extent to which young adults with intellectual disabilities engage with their state VR programs. One way for assessing young adult engagement is to look at the number of them who exit the program, which implies that they either applied or were referred to the program. Specifically, we examined the average number of young adults 16 to 30 years old who exited their state VR programs between 2002 and 2011. To allow for fair comparison across states with different population sizes, we report the VR engagement rate as the number of young adults who would have exited a state VR program if that state had a population of only 1,000 people with disabilities

    Data Note: Decline in the Provision of Facility-Based Work Services for People with Intellectual and Developmental Disabilities

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    Facility-based work services are vocational services provided in settings where the majority of people have a disability and receive continuous job-related supports and supervision. Facility-based work services are also referred to as sheltered work, work activity services, or extended employment programs

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

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    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)

    The Go2School project for promoting cycling to school: A case study in Palermo

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    The identification of transport policy measures able to reduce the use of private cars for home-to-school travel is very relevant to reduce congestion during peak hours and to ensure that the areas around schools have livable environments. An action that policymakers could apply is promoting cycling to school through the introduction of bikesharing programs and creating safe routes to school through the construction of new cycle infrastructure. The aim of the paper has been, therefore, to assess if these policies could lead the high-school students to cycle to school, considering the city of Palermo as a case study. The goal is reached through the calibration of a modal choice model based on Stated Preference interviews. The costs that the local authority have to support have been compared with the benefits that the realization of new cycle paths entails in terms of the modal shift, reduction of car mileage and reduction of the externalities. According to the model, the construction of the new cycle paths will lead to an impressive increase in the use of the bicycle for home-to-school travel and also to greater use of public transport, due to the multimodality guaranteed by the bikesharing stations near the railway stations and tram stops

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

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    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
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