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Linear Audio Vol 1 is the second issue of a series of printed bookzines dedicated to technical audio and perception. The international team of authors for this issue again offers technical audio articles on a wide ranging number of subjects, from projects and concepts to book reviews and musings: Power amplification: Ian Hegglun developed A family of high-efficiency class-A power amplifiers allowing 'green' class-A amplifiers based on inherent square-law output devices, with only half the usual dissipation. Loudspeakers and cross-overs: Jean-Claude Gaertner concludes his Project 21 DSP- based...

Same-sex unions have been recorded in the history of a number of cultures, but marriages or socially-accepted unions between same-sex partners were rare or nonexistent in other cultures. In the late 20th century, religious rites of marriage without legal recognition became increasingly common. This text follows the history of marriage equality up to the United States Supreme Court's landmark decision of OBERGEFELL V. HODGES.

Since the publication of Jerlov's classic volume on optical oceanography in 1968, the ability to predict or model the submarine light field, given measurements of the inherent optical properties of the ocean, has improved to the point that model fields are very close to measured fields. In the last three decades, remote sensing capabilities have fostered powerful models that can be inverted to estimate the inherent optical properties closely related to substances important for understanding global biological productivity, environmental quality, and most nearshore geophysical processes. This...