3,990 research outputs found
Strong Families or Patriarchal Economies? Southern European Labor Markets and Welfare in Comparative Perspective
Italy; Spain; Mediterranean; unemployment; welfare state
Multiplicativity properties of entrywise positive maps
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
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 ( and 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 . Perhaps
surprisingly, we also present examples of degradable channels with ``large''
environments, in the sense that the minimal dimension . Indeed, one
can have .
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
Land Grant Application- King, Moses (Pittston)
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
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
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
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Helping battered women : a study of the relationship between nurses\u27 education and experience and their preferred models of helping.
The battering and abuse of women is a problem which adversely affects the health of millions of women in the United States. Nurses are in a particularly strategic position to identify and provide helpful interventions for women who come in contact with the health care establishment. The feminist literature argues for helping strategies which do not blame women for their abuse and which attempt to empower women to take control of their own lives. However, often the past educational preparation of the nurse has not included content on battering, leaving them unprepared to assess for abuse or to provide intervention aimed at fostering independence and personal empowerment. The purpose of this study was to determine the perceived model of helping preferred by nurses in their interventions with battered women and to determine those factors in the nurses\u27 educational experiences and clinical practice which affect their preference for a specific helping model. Data was obtained from 116 registered nurses, 57 nurses practiced in the emergency department setting, and 59 nurses had attended a three day national nursing conference on violence against women. The data of this study were collected through self-administered questionnaires: the Education/Experience Questionnaire and the Help Orientation Test. The results of this study indicate that the medical model of helping, in which the client is attributed low responsibility for both problem cause and solution, not a particularly empowering model but one tending to foster dependency, is characteristic of the helping orientation of all nurses in the study sample. This is true regardless of practice setting, or whether or not nurses have acquired specific knowledge on the topic of battering. All nurses reported significant clinical and personal contact with battered women but few reported having acquired specific education on battering. It was found that nurses who had acquired specific knowledge on battering did perceive themselves as knowledgeable and well prepared in their practice with battered women. This research pointed to the relevance of the type of education about woman abuse which is necessary to permit nurses to not just help battered women but to help in such a way as to foster independence
Whiteness in the English countryside : a case of the National Trust
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
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