28,750 research outputs found

    Building health research systems to achieve better health

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    Health research systems can link knowledge generation with practical concerns to improve health and health equity. Interest in health research, and in how health research systems should best be organised, is moving up the agenda of bodies such as the World Health Organisation. Pioneering health research systems, for example those in Canada and the UK, show that progress is possible. However, radical steps are required to achieve this. Such steps should be based on evidence not anecdotes. Health Research Policy and Systems (HARPS) provides a vehicle for the publication of research, and informed opinion, on a range of topics related to the organisation of health research systems and the enormous benefits that can be achieved. Following the Mexico ministerial summit on health research, WHO has been identifying ways in which it could itself improve the use of research evidence. The results from this activity are soon to be published as a series of articles in HARPS. This editorial provides an account of some of these recent key developments in health research systems but places them in the context of a distinguished tradition of debate about the role of science in society. It also identifies some of the main issues on which 'research on health research' has already been conducted and published, in some cases in HARPS. Finding and retaining adequate financial and human resources to conduct health research is a major problem, especially in low and middle income countries where the need is often greatest. Research ethics and agenda-setting that responds to the demands of the public are issues of growing concern. Innovative and collaborative ways are being found to organise the conduct and utilisation of research so as to inform policy, and improve health and health equity. This is crucial, not least to achieve the health-related Millennium Development Goals. But much more progress is needed. The editorial ends by listing a wide range of topics related to the above priorities on which we hope to feature further articles in HARPS and thus contribute to an informed debate on how best to achieve such progress

    Near Tribimaximal Neutrino Mixing with Delta(27) Symmetry

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    The discrete subgroup Delta(27) of SU(3) has the interesting multiplication rule 3 X 3 = bar{3} + bar{3} + bar{3}, which is used to obtain near tribimaximal neutrino mixing. Using present neutrino oscillation data as input, this model predicts that the effective mass m_{ee} measured in neutrinoless double beta decay will be 0.14 eV.Comment: 6 pages, no figur

    Dark Scalar Doublets and Neutrino Tribimaximal Mixing from A_4 Symmetry

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    In the context of A_4 symmetry, neutrino tribimaximal mixing is achieved through the breaking of A_4 to Z_3 (Z_2) in the charged-lepton (neutrino) sector respectively. The implied vacuum misalignment of the (1,1,1) and (1,0,0) directions in A_4 space is a difficult technical problem, and cannot be treated without many auxiliary fields and symmetries (and perhaps extra dimensions). It is pointed out here that an alternative scenario exists with A_4 alone and no redundant fields, if neutrino masses are "scotogenic", i.e. radiatively induced by dark scalar doublets as recently proposed.Comment: 8 pages, 2 figures, 1 reference and 1 paragraph adde

    Z_3 Dark Matter and Two-Loop Neutrino Mass

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    Dark matter is usually distinguished from ordinary matter by an odd-even parity, i.e. the discrete symmetry Z_2. The new idea of Z_3 dark matter is proposed with a special application to generating radiative Majorana neutrino masses in two-loop order.Comment: expanded (9 pages, 2 figures), 2 references adde

    El desarrollo social del niño

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    Se consideran tres factores que intervienen en el desarrollo social del niño: aprendizaje social, normatividad ético-social y relaciones interpersonales (familia, escuela y grupo de iguales). El aprendizaje social es estudiado según el modelo conductista (Bandura /Walters, Miller/Dollard), y en la atención a las normas se tiene en cuenta el esquema de desarrollo propuesto por Piaget.On considerère 3 facteurs qui interviennent dans le développement social de l'enfant: apprentissage social, normativité éthico-sociale et relations interpersonelles (famille, école et groupe de gens de la même condition). L'apprentissage social est étudié selon le modkle watsonien (Bandura /Walters, Miller /Dollard), et dans l'attention aux normes, on tient compte du schéma de développement proposé par Piaget.Three factors which contribute to the social development of a child are considered: social learning, socioethical norms and interpersonal relationships (family, school and peer groups). Social learning is studied according to the behaviourist model (Bandura/Walters, Miller/Dollard), and as regards norms, the developmental theory proposed by Piaget is taken into account

    El desarrollo social del niño

    Get PDF
    Se consideran tres factores que intervienen en el desarrollo social del niño: aprendizaje social, normatividad ético-social y relaciones interpersonales (familia, escuela y grupo de iguales). El aprendizaje social es estudiado según el modelo conductista (Bandura /Walters, Miller/Dollard), y en la atención a las normas se tiene en cuenta el esquema de desarrollo propuesto por Piaget.On considerère 3 facteurs qui interviennent dans le développement social de l'enfant: apprentissage social, normativité éthico-sociale et relations interpersonelles (famille, école et groupe de gens de la même condition). L'apprentissage social est étudié selon le modkle watsonien (Bandura /Walters, Miller /Dollard), et dans l'attention aux normes, on tient compte du schéma de développement proposé par Piaget.Three factors which contribute to the social development of a child are considered: social learning, socioethical norms and interpersonal relationships (family, school and peer groups). Social learning is studied according to the behaviourist model (Bandura/Walters, Miller/Dollard), and as regards norms, the developmental theory proposed by Piaget is taken into account
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