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The role of principal component analysis in vowel acquisition researchZajdo, K.; van der Stelt, J.M.; Wempe, A.G. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Major investments are currently being made in school infrastructure. In Los Angeles alone, 90 new schools are to be constructed in the next 10 to 15 years, and hundreds of existing schools will undergo major renovation. Similar efforts are underway in large urban school districts throughout the country. This presents a unique opportunity to improve acoustical quality in classrooms for future generations of teachers and students. While some school districts are embracing this opportunity, there are substantial challenges to be faced before improvements in classroom acoustical quality are widely realized. Despite recent adoption of the ANSI standard, there are inconsistent views among school administrators and designers on the extent of the problem and the urgency to act. Additionally, there is insufficient data on the incremental costs of achieving improved acoustical quality in new construction or modernization projects. Meanwhile critical design and purchasing decisions are underway. There are promising examples of how school districts can successfully meet these challenges and forge improved acoustical quality in the learning environment. The focus of this discussion is on the use of policy reforms to drive better design and purchasing decisions, and how these decisions can be further influenced by community involvement and interagency collaboration. Issues in meeting the ANSI 12.60 classroom acoustics standard fall into two categories: overcoming design team unwillingness to implement recommended criteria and finding practical methods of meeting issues of reverberation control and HVAC noise control. Solutions to HVAC noise control are emerging; an example is the use of fan coil units in new construction. Education of owners and designers is an ongoing process. It is hoped this paper contributes to a dialogue between the parties involved in school construction. 8:254aAA3. Source attenuating HVAC equipment-Just the facts. Arthur Hallstrom ͑Trane, American Standard, 1515 Mercer Rd., Lexington, KY 40511͒ Current classroom designs range from NC 63 to NC 25. The ASA/ANSI 12.60 Classroom Standard sets a re...

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