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Pratt, Kenneth W,Ortiz-Aparicio, Jose Luis,Matehuala-Sanchez, Francisco Javier,Pawlina, Monika,Kozlowski, Wladyslaw,Borges, Paulo P,da Silva Junior, Wiler B,Borinsky, Mó,nica B,Hernandez-Mabel P Springer-Verlag 2013 Metrologia Vol.50 No.-
<P>This key comparison (KC), CCQM-K73, was performed to demonstrate the capability of the participating National Metrology Institutes (NMIs) to measure the amount content of H<SUP>+</SUP>, ν<SUB>H<SUP>+</SUP></SUB>, in an HCl solution with a nominal ν<SUB>H<SUP>+</SUP></SUB> of 0.1 mol kg<SUP>−1</SUP>. The comparison was a joint activity of the Electrochemical Working Group (EAWG) and Inorganic Analysis Working Group (IAWG) of the CCQM and was coordinated by NIST (USA) and CENAM (Mexico).</P><P>The agreement of the results was not commensurate with the claimed uncertainties of the subset of participants that claimed small uncertainties for this determination. A workshop on technical issues relating to the CCQM-K73 measurements was conducted at the joint IAWG-EAWG meeting at the Bureau International des Poids et Mesures (BIPM), Paris (Sèvres) in April 2010. Several possible sources of bias were investigated, but none could explain the observed dispersion among the participants' results.</P><P>In the absence of a specific cause for the dispersion, the IAWG and EAWG decided to assign a Key Comparison Reference Value, KCRV, and standard uncertainty of the KCRV, u<SUB>KCRV</SUB>, based on the DerSimonian–Laird statistical estimator. The u<SUB>KCRV</SUB> is dominated by the between-laboratory scatter of results in CCQM-K73. The uncertainty estimates from the participants with the lowest reported uncertainties remain unsupported by this KC.</P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>
Development and Analysis of a Self-Sensing Magnetostrictive Actuator Design
Pratt,Jon,Flatau,Alison B. 대한기계학회 1993 Korea - U. S. Vibration Engineering Seminar Vol.1 No.1
A self-sensing magnetostrictive actuator design based on a linear systems model of magnetostrictive transduction for Terfenol-D is developed and analyzed. Self-sensing, or the ability of a transducer to sense its own motion as it is being driven, has been demonstrated for electromechanical transducers such as moving voice coil loudspeakers and, most recently, piezoelectric distributed moment actuators. In these devices, self-sensing was achieved by constructing a bridge circuit to extract a signal proportional to transducer motion even as the transducer was being driven. This approach is analyzed for a magnetostrictive device. Working from coupled electromechanical magnetostrictive transduction equations found in the literature, the concept of the transducer's $quot;blocked$quot; electrical impedance and motional impedance are developed, and a bridge design suggested and tested. However, results presented in this paper will show that magnetostrictive transduction is inherently non-linear, and does not, therefore, lend itself well to the traditional bridge circuit approach to self-sensing.
The Durham Oriental Music Festivalandits Legacy
Keith Pratt,Simon Mills,Keith Howard 아시아음악학회 2017 Asian Musicology Vol.27 No.-
Between 1976 and 1982 the city and University of Durham, UK, hosted a series of three unprecedented festivals. Their aim was to introduce Western audiences to the traditional music of Asia by means of concerts, lectures, workshops, films and exhibitions. Countries represented by topclass artists and scholars were China, Korea, Japan, Turkey, Egypt, Iraq, Iran, India, Bangladesh, Thailand, Indonesia, Vietnam and Laos. Overcoming many difficulties, the Durham Oriental Music Festival acquired a worldwide reputation and successfully helped to promote Asian music and ethnomusicology in the West. In 2009 Durham University revived its aims by introducing a Festival of East Asian Music. More modest in scale, this annually promotes performance and study of musical themes from countries of East Asia, again putting emphasis on authenticity and high quality.