Scientific Research Discipline Research Articles

V.L. Jordan, 1909–1982: A biographical memoire

Throughout his professional career, spanning nearly fifty years, Vilhelm Jordan attempted to bring the methods and disciplines of scientific research to bear on the day-to-day practice of the acoustical consultant. The development of his practice from the Danish Radio Broadcasting House to the Sydney Opera House is traced, and his skill at informing professional judgment with scientific inquiry is exemplified. In discussing the application of the Schroeder integrated impulse theorem to early decay time measurements, a proposal is made for the revival of statistical description of random noise decays as a possible concert hall criterion. This paper formed the text of a memorial address given at the Institute of Acoustics meeting held in Edinburgh, Scotland, in September, 1982.

1st International Symposium on Groundwater Ecology. Introduction: Sense and Course of the Meeting

During the last decenniums ecological investigations of subterranean waters received an increasing interest from many sides. The cause is that the young field of limnological activities produced new problems for all scientists working on biotopes and biocenoses of organisms. For example, hydrogeology, speleology, stygochemistry and have many common problems because fills a system of interstices and caverns of different volumes in various petrological materials. Moreover many common problems of and hygienics arose from the fact that in layers of sand and gravel represents the characteristic biotope for organisms as well as being the most important reservoir of drinking water. Until now the knowledge of organisms as well as information about the effectivity of ecological factors in ground waters were still relatively limited. Nearly all disciplines of scientific research on subterranean waters, which in the future will form groundwater ecology, are still in the initial stages of development. The term groundwater ecology as used here is to be considered as describing a program rather than an established science. A more comprehensive knowledge of the ecosystem may only be achieved by integrating the results of zoosystematics, biocoenology, physiology, hydrogeology, chemistry, hygienics, zoogeography and other aspects of the subject. All students working in these fields may be called groundwater ecologists because their studies form the elements of groundwater ecology. Both krms, groundwater ecology as well as groundwater ecologists shall here be used in such a broad sense. In order to perceive distinct contours of groundwater ecology most stygolimnologists are obviously interested about results obtained by other