3,990 research outputs found

    Strong Families or Patriarchal Economies? Southern European Labor Markets and Welfare in Comparative Perspective

    Get PDF
    Italy; Spain; Mediterranean; unemployment; welfare state

    Multiplicativity properties of entrywise positive maps

    Get PDF
    Multiplicativity of certain maximal p -> q norms of a tensor product of linear maps on matrix algebras is proved in situations in which the condition of complete positivity (CP) is either augmented by, or replaced by, the requirement that the entries of a matrix representative of the map are non-negative (EP). In particular, for integer t, multiplicativity holds for the maximal 2 -> 2t norm of a product of two maps, whenever one of the pair is EP; for the maximal 1 -> t norm for pairs of CP maps when one of them is also EP; and for the maximal 1 -> 2t norm for the product of an EP and a 2-positive map. Similar results are shown in the infinite-dimensional setting of convolution operators on L^2(R), with the pointwise positivity of an integral kernel replacing entrywise positivity of a matrix. These results apply in particular to Gaussian bosonic channels.Comment: results extended to some infinite dimensional cases, including the Gaussian bosonic channe

    The structure of degradable quantum channels

    Full text link
    Degradable quantum channels are among the only channels whose quantum and private classical capacities are known. As such, determining the structure of these channels is a pressing open question in quantum information theory. We give a comprehensive review of what is currently known about the structure of degradable quantum channels, including a number of new results as well as alternate proofs of some known results. In the case of qubits, we provide a complete characterization of all degradable channels with two dimensional output, give a new proof that a qubit channel with two Kraus operators is either degradable or anti-degradable and present a complete description of anti-degradable unital qubit channels with a new proof. For higher output dimensions we explore the relationship between the output and environment dimensions (dBd_B and dEd_E respectively) of degradable channels. For several broad classes of channels we show that they can be modeled with a environment that is "small" in the sense dEdBd_E \leq d_B. Perhaps surprisingly, we also present examples of degradable channels with ``large'' environments, in the sense that the minimal dimension dE>dBd_E > d_B. Indeed, one can have dE>14dB2d_E > \tfrac{1}{4} d_B^2. In the case of channels with diagonal Kraus operators, we describe the subclass which are complements of entanglement breaking channels. We also obtain a number of results for channels in the convex hull of conjugations with generalized Pauli matrices. However, a number of open questions remain about these channels and the more general case of random unitary channels.Comment: 42 pages, 3 figures, Web and paper abstract differ; (v2 contains only minor typo corrections

    Comparison of two methods of instruction in library usage

    Get PDF

    Land Grant Application- King, Moses (Pittston)

    Get PDF
    Land grant application submitted to the Maine Land Office on behalf of Moses King for service in the Revolutionary War, by their widow Mary Brainardo.https://digitalmaine.com/revolutionary_war_me_land_office/1534/thumbnail.jp

    Electronic swallowing intervention package to support swallowing function in patients with head and neck cancer: development and feasibility study

    Get PDF
    Background: Many patients undergoing treatment for head and neck cancer (HNC) experience significant swallowing difficulties, and there is some evidence that swallowing exercises may improve outcomes, including quality of life. This feasibility study developed an evidence-based, practical Swallowing Intervention Package (SiP) for patients undergoing chemo-radiotherapy (CRT) for HNC. As part of the study, an electronic version of SiP (e-SiP) was concurrently developed to support patients to self-manage during treatment. This paper reports on the e-SiP component of this work. Objective: To develop and conduct preliminary evaluation of an electronic support system (e-SiP) for patients undergoing CRT for head and neck cancer. Methods: The study involved health professionals and patients who were undergoing CRT for head and neck cancer. The scoping stage of e-SiP development involved investigated the potential usefulness of e-SiP, exploring how e-SiP would look and feel and what content would be appropriate to provide. Patient and carer focus groups and a health professionals’ consensus day were used as a means of data gathering around potential e-SiP content. A repeat focus group looked at an outline version of e-SIP and informed the next stage of its development around requirements for tool. This was followed by further development and a testing stage of e-SiP involved the coding of a prototype which was then evaluated using a series of steering group meetings, semi-structured interviews with both patients and health care professionals, and analysis of e-SiP log data. Results: Feedback from focus groups and health professional interviews was very positive and it was felt e-SiP use would support and encourage patients in conducting their swallowing exercises. However, of the ten patients offered e-SIP, only two opted to use it. For these patients, aspects of the e-SIP application were considered useful, in particular the ease of keeping a diary of exercises performed. Interviews with users and non-users suggested significant barriers to its use. Most significantly the lack of flexibility of platform on which e-SiP could be accessed appeared a dominant factor in deterring e-SiP use. Conclusions: Results suggest a need for further research to be conducted around the implementation of e-SiP. This involves evaluating how e-SiP can be better integrated into usual care, and through patient training and staff engagement, can be seen as a beneficial tool to help support patients in conducting swallowing exercises

    Metabolism in myocardial ischaemia and reperfusion with specific reference to the role of glucose

    Get PDF
    Hypothesis: Glucose is known to be protective in moderate low flow ischaemia due to the production of glycolytic ATP. However, it is questioned whether glucose would still be protective in ultra-low flow ischaemia. Firstly, glycolysis is thought to be inhibited, and secondly, deleterious glycolytic metabolites accumulate. Our hypothesis was that in ultra-low flow ischaemia, glucose utilisation is not inhibited at the level of glycolysis, but by delivery. Increased delivery of glucose should result in increased production of protective glycolytic ATP, but the rate of metabolite accumulation would also increase. Using ultra low flow rates, I wished to investigate how to achieve optimal rates of glycolysis, and how such rates would be balanced by any detrimental component of metabolite accumulation. Methods: The isolated Langendorff-perfused rat heart, with a left ventricular balloon to record ischaemic contracture and reperfusion stunning, was used, with severe flow restriction. Glucose concentrations were changed and pre-ischaemic glycogen contents were altered by perfusion with different substrates (acetate - depletion~ glucose + insulin - loading) or by preconditioning, with 5 min ischaemia and 5 min reperfusion prior to sustained ischaemia. Results: Analysis of glucose uptake relative to delivery showed that in severe low flow ischaemia, the extraction of glucose was increased, and glycolysis was thus limited more by substrate supply than by enzyme inhibition. Analysis of metabolites confirmed this concept. The optimal glucose concentration during severe low flow ischaemia was 11 mM, giving maximal recovery on reperfusion. Both lower and higher glucose concentrations increased ischaemic contracture. Changes in pre-ischaemic glycogen levels correlated with the time to onset of contracture, such that a reduction in glycogen accelerated contracture. Prior glycogen depletion or loading did not improve functional recovery. The benefits of preconditioning on reperfusion function following sustained total global ischaemia could not be related to glycogen depletion. If preconditioning were followed by sustained low flow ischaemia, glucose uptake was increased, but no benefit was found, possibly because a low residual flow abolished the effects of preconditioning. Many of the above results are consistent with the hypothesis that too low a rate of glycolysis results. in insufficient ATP production for protection, while excess glycolytic rates lead to excess metabolite accumulation with detrimental effects. Conclusions: Provision of glucose at the correct concentration, when the benefit associated with glycolytic ATP outweighs the detriment associated with moderate metabolite accumulation, is protective to the low-flow ischaemic myocardium, which can upregulate its ability to extract glucose. Improved residual flow enhances this benefit. Prior glycogen depletion is not beneficial, despite a reduced metabolite accumulation. This mechanism cannot be related to the protective effect of preconditioning

    Whiteness in the English countryside : a case of the National Trust

    Get PDF
    EThOS - Electronic Theses Online ServiceGBUnited Kingdo
    corecore