Washington State University

About: Washington State University is a education organization based out in Pullman, Washington, United States. It is known for research contribution in the topics: Population & Gene. The organization has 26947 authors who have published 57736 publications receiving 2341509 citations. The organization is also known as: WSU & Wazzu.

Observation of Gravitational Waves from a Binary Black Hole Merger

Abstract: On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of $1.0 \times 10^{-21}$. It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1 {\sigma}. The source lies at a luminosity distance of $410^{+160}_{-180}$ Mpc corresponding to a redshift $z = 0.09^{+0.03}_{-0.04}$. In the source frame, the initial black hole masses are $36^{+5}_{-4} M_\odot$ and $29^{+4}_{-4} M_\odot$, and the final black hole mass is $62^{+4}_{-4} M_\odot$, with $3.0^{+0.5}_{-0.5} M_\odot c^2$ radiated in gravitational waves. All uncertainties define 90% credible intervals.These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger.

A decimal code for the growth stages of cereals

Abstract: The decimal code scale for indicating the growth stages of cereals as developed by the authors and published by Eucarpia is explained and described

Mail and internet surveys: The tailored design method, 2nd ed.

Abstract: Preface to the 2007 Update.Preface to the Second Edition.Acknowledgments.Part One: ELEMENTS OF THE TAILORED DESIGN METHOD.1 Introduction to Tailored Design.2 Writing Questions.3 Constructing the Questionnaire.4 Survey Implementation.5 Reduction of Coverage and Sampling Errors.Part Two: TAILORING TO THE SURVEY SITUATION.6 Mixed-Mode Surveys.7 Alternative Questionnaire Delivery: In Person, to Groups, and through Publications.8 When Timing Is Critical: Diary, Customer Satisfaction, and Election Forecast Surveys.9 Household and Individual Person Surveys by Government.10 Surveys of Businesses and Other Organizations.11 Internet and Interactive Voice Response Surveys.12 Optical Scanning and Imaging, and the Future of Self-Administered Surveys.References.2007 Appendix: Recent Developments in the Design of Web, Mail, and Mixed-Mode Surveys.Appendix References.Index.