More signal, less noise: making good use of bright sources and fast detectors

Averaged kick maps: less noise, more signal…and probably less bias

Use of reliable density maps is crucial for rapid and successful crystal structure determination. Here, the averaged kick (AK) map approach is investigated, its application is generalized and it is compared with other map-calculation methods. AK maps are the sum of a series of kick maps, where each kick map is calculated from atomic coordinates modified by random shifts. As such, they are a num...

Making Less Do More at NASA.

William T. Golden Treasurer Richard S. Nicholson Executive Officer John Abelson Frederick W. Alt Don L. Anderson Stephen J. Benkovic David E. Bloom Floyd E. Bloom Henry R. Bourne James J. Bull Kathryn Calame C. Thomas Caskey Dennis W. Choi John M. Coffin Bruce F. Eldridge Paul T. Englund Richard G. Fairbanks Douglas T. Fearon Harry A. Fozzard Victor R. Fuchs Theodore H. Geballe Margaret J. Gell...

Case-control investigations of a DRD2 missense variant in Asian populations: more noise, less signal.

Use of FP-SPLIT Slits for Reaching High Signal-to-Noise with MAMA Detectors

A pre-flight uncertainty for STIS was the extent to which the MAMA detectors would support high signal-to-noise observations given inherently low count rates, limitations on available flat fields, and the possibility of evolution in pixel-to-pixel response stability. This ISR reports on results from STIS/SMOV-7091 Pixel-to-pixel Response Stability in which spectra were acquired at high count le...

The Signal and Noise Analysis of Direct Conversion EHM Transceivers

A direct conversion modulator-demodulator with even harmonic mixers with emphasis on noise analysis is presented. The circuits consist of even harmonic mixers (EHMs) realized with antiparallel diode pairs (APDPs). We evaluate the different levels of I/Q imbalances and DC offsets and use signal space concepts to analyze the bit error rate (BER) of the proposed transceiver using M-ary QAM schemes...