Navigation by satellite using two-way range and doppler data

Navigation by satellite using two-way range and Doppler dat

Paediatric gastroenterology evaluation of overweight and obese children referred from primary care for suspected non-alcoholic fatty liver disease.

BackgroundScreening overweight and obese children for non-alcoholic fatty liver disease (NAFLD) is recommended by paediatric and endocrinology societies. However, gastroenterology societies have called for more data before making a formal recommendation.AimTo determine whether the detection of suspected NAFLD in overweight and obese children through screening in primary care and referral to paediatric gastroenterology resulted in a correct diagnosis of NAFLD.MethodsInformation generated in the clinical evaluation of 347 children identified with suspected NAFLD through screening in primary care and referral to paediatric gastroenterology was captured prospectively. Diagnostic outcomes were reported. The diagnostic performance of two times the upper limit of normal (ULN) for alanine aminotransferase (ALT) was assessed.ResultsNon-alcoholic fatty liver disease was diagnosed in 55% of children identified by screening and referral. Liver disease other than NAFLD was present in 18% of those referred. Autoimmune hepatitis was the most common alternative diagnosis. Children with NAFLD had significantly (P < 0.05) higher screening ALT (98 ± 95) than children with liver disease other than NAFLD (86 ± 74). Advanced fibrosis was present in 11% of children. For the diagnosis of NAFLD, screening ALT two times the clinical ULN had a sensitivity of 57% and a specificity of 71%.ConclusionsScreening of overweight and obese children in primary care for NAFLD with referral to paediatric gastroenterology has the potential to identify clinically relevant liver pathology. Consensus is needed on how to value the risk and rewards of screening and referral, to identify children with liver disease in the most appropriate manner

Universal Features of Holographic Anomalies

We study the mechanism by which gravitational actions reproduce the trace anomalies of the holographically related conformal field theories. Two universal features emerge: a) the ratios of type B trace anomalies in any even dimension are independent of the gravitational action, being uniquely determined by the underlying algebraic structure b) the normalization of the type A and the overall normalization of the type B anomalies are given by action dependent expressions with the dimension dependence completely fixed.Comment: 17 pages, harvma

A classification of local Weyl invariants in D=8

Following a purely algebraic procedure, we provide an exhaustive classification of local Weyl-invariant scalar densities in dimension D=8.Comment: LaTeX, 19 pages, typos corrected, one reference adde

N-String Vertices in String Field Theory

We give the general form of the vertex corresponding to the interaction of an arbitrary number of strings. The technique employed relies on the ``comma" representation of String Field Theory where string fields and interactions are represented as matrices and operations between them such as multiplication and trace. The general formulation presented here shows that the interaction vertex of N strings, for any arbitrary N, is given as a function of particular combinations of matrices corresponding to the change of representation between the full string and the half string degrees of freedom.Comment: 22 pages, A4-Latex (latex twice), FTUV IFI

Building bridges within the field of philosophy of education. Construyendo puentes en el campo de la filosofía de la educación.

En este ensayo, introducimos los diferentes contenidos de los que se ocupa este número monográfico dedicado a la filosofía de la educación que edita Bajo Palabra. Revista de Filosofía. El proyecto pretende introducir la filosofía de la educación como una nueva sección en esta publicación y dar a conocer en el ámbito de trabajo más estrictamente filosófico qué temáticas y aproximaciones circulan en el área de la filosofía de la educación. Se ha buscado, además, establecer el perfil de la filosofía de la educación con respecto, en primer lugar, a los trabajos que se han venido haciendo en su nombre y, en segundo lugar, a lo que queda aún por hacer. Estas preguntas son respondidas por los diferentes colaboradores a lo largo de tres secciones. En la primera se ofrecen diferentes visiones de lo que es la filosofía de la educación, en la segunda se presentan varios trabajos representativos de lo que se está investigando actualmente en la filosofía de la educación y en la tercera, se ofrecen tres recensiones críticas sobre publicaciones recientemente aparecidas en tres contextos lingüísticos diferentes relativas a la filosofía de la educación. Esperamos que los lectores de este número monográfico, disfruten de la riqueza de pensamiento y las inesperadas relaciones que aparecen cuando se inicia una conversación en el campo de la filosofía de la educaciónPalabras clave: Filosofía de la educación, área de conocimiento, líneas temáticas, enfoques filosóficos.Abstract:In this paper we introduce this special issue of Bajo Palabra. Journal of Philosophy, devoted to philosophy of education. The project marks the introduction of philosophy of education as a new section within the Bajo Palabra, and aims to present to a broader philosophical audience those themes and approaches which are circulating within the field of philosophy of education. It has been our intention to raise the profile of philosophy of education in respect of both the work which has been done and is being done in its name on the one hand and the work that ought to be done in its name on the other. Happily, these intentions have been addressed by the various contributors. We have arranged the contents of this edition into three sections. The first offers different visions of what the philosophy of education is and ought to be, the second presents several papers which are representative of what is currently being investigated in the philosophy of education, and the third offers three book reviews of recent introductions to the philosophy of education, each from a different linguistic context. We hope readers of the present volume will by stimulated to further reflection by the fruitful thoughts and unexpected relations that emerge when a conversation within the field of philosophy of education starts up.Keywords: Philosophy of education, area of knowledge, research lines, philosophical approaches

Dynamics of Asymptotic Diffeomorphisms in (2+1)-Dimensional Gravity

In asymptotically anti-de Sitter gravity, diffeomorphisms that change the conformal boundary data can be promoted to genuine physical degrees of freedom. I show that in 2+1 dimensions, the dynamics of these degrees of freedom is described by a Liouville action, with the correct central charge to reproduce the entropy of the BTZ black hole.Comment: 8 pages, LaTeX; v2: slightly expanded discussion of implications, more references; v3: more explicit comparison to Chern-Simons approach and discussion of role of constraints; v4: added discussion of relationships to and differences with earlier work, new and corrected reference

Violation of Energy Bounds in Designer Gravity

We continue our study of the stability of designer gravity theories, where one considers anti-de Sitter gravity coupled to certain tachyonic scalars with boundary conditions defined by a smooth function W. It has recently been argued there is a lower bound on the conserved energy in terms of the global minimum of W, if the scalar potential arises from a superpotential P and the scalar reaches an extremum of P at infinity. We show, however, there are superpotentials for which these bounds do not hold.Comment: 16 pages, 4 figures, v2: discussion of vacuum decay included, typos corrected, reference adde

The No-ghost Theorem for AdS_3 and the Stringy Exclusion Principle

A complete proof of the No-ghost Theorem for bosonic and fermionic string theories on AdS_3, or the group manifold of SU(1,1), is given. It is then shown that the restriction on the spin (in terms of the level) that is necessary to obtain a ghost-free spectrum corresponds to the stringy exclusion principle of Maldacena and Strominger.Comment: 20 pages, LaTeX; references adde

Quasilinearization and the estimation of chemical rate constants from raw kinetic data

A technique for estimating chemical rate constants from raw kinetic data is suggested. Such problems are viewed as nonlinear multipoint boundary-value problems for systems of nonlinear ordinary differential equations, for which the quasilinearization procedure offers an affective means of numerical solution. The method is illustrated using kinetic data obtained by Bodenstein and Lindler on some gas phase reactions of nitrogen and oxygen.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33352/1/0000750.pd