By excitation of cadmium vapor with a high-peak-power KrF excimer laser pulse, fluorescence of an atomic transition at lambda = 508 nm is induced by a two-photon ionization process followed by fast recombination. The nonlinear response of the medium is used to develop a simple single-shot autocorrelator for subpicosecond KrF excimer laser pulses operating down to intensities of less than 10(9)W...

. \ In an earlier paper, it was suqqested that peakinq capacitors such as are used in nuclear electromaqnetic pulse simulators be used to supply the fast current rise times which have been indicated in recent researches in the field of liqhtninq spherics and liqhtninq strikes to aircraft. A more quantitative experimental and analytical study has been undertaken to examine the feasilibiiity and ...

We consider the problem of finding known asteroids in a given region of space and time. Each asteroid’s trajectory is known precisely at any given point in time, but evaluation of the model describing its location is prohibitively expensive at query time. We propose a framework for sampling the base model and indexing the resulting “observations.” Our system includes 11 million simulated astero...

We constructed an ultrahigh-throughput, high-resolution ultraviolet (UV) Raman spectrograph that utilizes a high-efficiency filter-stage monochromator and a high-dispersion Echelle spectrograph. The spectrograph utilizes a total of six mirrors and two gratings, with an overall efficiency at 229 nm of ~18%. The limiting resolution of our spectrometer is 0.6 cm⁻¹ full width half-maximum (FWHM), a...

We report on single-dish monitoring as well as extremely high angular resolution observations of the flaring H2O maser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted by ∼130 km s −1 with respect to the systemic velocity, is very broad, with a FWHM of 130 km s, and has no detectable high velocity components within 1500 km s on either side of the strong line. Monitoring observations ...

Spatial smoothing is a widely used preprocessing step in functional magnetic resonance imaging (fMRI) data analysis. In this work, we report on the spatial smoothing effect on task-evoked fMRI brain functional mapping and functional connectivity. Initially, we decomposed the task fMRI data into a collection of components or networks by independent component analysis (ICA). The designed task par...

Last weekend in New York heralded another of the annual UN heads-of-state summits at which inappropriate targets, processes and evaluation systems were reconfirmed. Politicians joined multilateral bureaucrats to congratulate [2] each other for hitting many of the MDG targets during the 2000-2015 period. Now there are 17 new SDGs with 169 new targets and more than 300 indicators to aim for by 2030.

We introduce a high-performance implementation of a loosely coherent statistic sensitive to signals spanning a finite-dimensional manifold in parameter space. Results from full-scale simulations on Gaussian noise are discussed, as well as implications for future searches for continuous gravitational waves and related searches for slowly modulated signals, such as emitted by radio pulsars. We de...