Ahtract-This paper presents information and concepts concerning the health of populations in less developed countries as background for discussions of more focused and detailed papers on these and related subjects. It begins with a review of health status and trends in developing countries since 1950. followed by a section identifying the major health problems and their causes. The third part i...

A fundamental problem in neuroscience is to characterize the dynamics of spiking from the neurons in a circuit that is involved in learning about a stimulus or a contingency. A key limitation of current methods to analyze neural spiking data is the need to collapse ar X iv :1 70 9. 09 72 3v 1 [ st at .M E ] 2 7 Se p 20 17 neural activity over time or trials, which may cause the loss of informat...

Previous optical studies found an unexpected deficit of bars at z > 0.7. To investigate the effects of bandshifting, we have studied the fraction of barred spirals in the NICMOS Deep Field North. At z > 0.7 we find at least four barred spirals, doubling the number previously detected. The number of barred galaxies is small because these (and previous) data lack adequate spatial resolution. A ty...

Introduction Conclusions References

5 Max-Planck-Institut [iir Extraterrestrische Physik, Giessenbachstrasse, D-8046, Garching bei Munchen, Germany "Astronomical Institute, National Observatory of Athens, PO Box 200048, GR-118 10, Athens, Greece 7 Institute for Astronomy, University of Edinburgh, Blackford Hil~ Edinburgh EH9 3HJ "Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB30HA "Danish Space Research In...

Crack surveys of bridge decks, performed over a 10-year period in northeast Kansas as part of three studies, provide strong guidance in identifying the parameters that control cracking in these structures. The surveys involve steel girder bridges—bridges that are generally agreed to exhibit the greatest amount of cracking in the concrete decks. The surveys include monolithic decks and decks wit...

[1] In 1995, two groups [Kageyama et al., 1995; Glatzmaier and Roberts, 1995a, 1995b] reported results of numerical integrations of fully three-dimensional, fully nonlinear dynamos. Their papers were precursors of a stream of such models that have focused particularly on the geodynamo. They provide us, in unprecedented detail, with spectacular realizations of interesting geomagnetic field behav...

We present an extended analysis of the Submillimetre Common User Bolometer Array (SCUBA) observations of the Hubble Deep Field (HDF), expanding the areal coverage of the Hughes et al. study by a factor of ∼1.8 and containing at least three further sources in addition to the five in that study. We also announce the public release of the reduced data products. The map is the deepest ever made in ...

HST high resolution spectra of metal-deficient field giants more than double the stars in previous studies, span ∼ 3 magnitudes on the red giant branch, and sample an abundance range [Fe/H]=−1 to −3. These stars, in spite of their age and low metallicity, possess chromospheric fluxes of Mg II (λ2800) that are within a factor of 4 of Population I stars, and give signs of a dependence on the meta...