23 research outputs found
Quantum state engineering assisted by entanglement
We suggest a general scheme for quantum state engineering based on
conditional measurements carried out on entangled twin-beam of radiation.
Realistic detection schemes such as {\sc on/off} photodetection, homodyne
detection and joint measurement of two-mode quadratures are analyzed in
details. Imperfections of the apparatuses, such as nonunit quantum efficiency
and finite resolution, are taken into account. We show that conditional {\sc
on/off} photodetection provides a reliable scheme to verify nonclassicality,
whereas conditional homodyning represents a tunable and robust source of
squeezed light. We also describe optical teleportation as a conditional
measurement, and evaluate the degrading effects of finite amount of
entanglement, decoherence due to losses, and nonunit quantum efficiency.Comment: Some pics with low resolution. Originals at http://www.qubit.i
Collider aspects of flavour physics at high Q
This review presents flavour related issues in the production and decays of
heavy states at LHC, both from the experimental side and from the theoretical
side. We review top quark physics and discuss flavour aspects of several
extensions of the Standard Model, such as supersymmetry, little Higgs model or
models with extra dimensions. This includes discovery aspects as well as
measurement of several properties of these heavy states. We also present public
available computational tools related to this topic.Comment: Report of Working Group 1 of the CERN Workshop ``Flavour in the era
of the LHC'', Geneva, Switzerland, November 2005 -- March 200
Sedentary patients with venous or mixed leg ulcers: determinants of physical activity.
Contains fulltext :
52134.pdf (publisher's version ) (Closed access)AIM: This paper is a report of a study to identify the determinants of physical activity (PA) in patients with venous leg ulcers to develop recommendations for behavioural interventions aimed at enhancing physical activity. BACKGROUND: Physical activity promotes wound healing and prevents the recurrence of wounds in venous patients with leg ulcers. Many patients with leg ulcers, however, have a sedentary lifestyle. METHOD: A random sample of 25 patients from two clinics were interviewed in 2003 using a combination of prestructured and open-ended questions. All these patients were being treated at an outpatient dermatology clinic and had a leg ulcer with venous or mixed aetiology at the time of the interview or in the month prior to the interview. FINDINGS: Only nine of the 25 patients (36%) reported sufficient levels of moderate strenuous physical activity, defined as 30 minutes a day on at least 5 days a week. The results show limited knowledge about the relationship between physical activity and leg ulceration, and low self-efficacy for increasing physical activity. In addition, multi-morbidity, pain and social support were identified as main determinants of physical activity. CONCLUSION: Suggestions for improving physical activity levels include influencing knowledge, beliefs and self-efficacy. Patient's individual physical limitations, pain, adequate footwear and social support should be taken into account. Programmes offered by specialized dermatology nurses to stimulate physical activity might fulfil patient needs and help enhance physical activity levels