133,751 research outputs found
Efficient experimental design for the Behrens-Fisher problem with application to bioassay
No full textA common approach in the design of experiment for the problem of comparing two means from a normal distribution is to assume knowledge of the ratio of the population variances. The optimal sampling ratio is proportional to the square root of this quantity. In this paper it is demonstrated that a misspecification of this ratio can cause a substantial loss in power of the corresponding tests. As a robust alternative a maximin approach is used to construct designs, which are efficient, whenever the experimenter is able to specify a specific region for the ratio of the population variances. The advantages of the robust designs for inference in the Behrens-Fisher problem are illustrated by means of a simulation study and an application to the design of experiment for bioassay is presented. --Behrens-Fisher problem,bioassay,design of experiment,local optimal design,robust designs
B. Lyn Behrens Memorial Plaque
No full textOn the plaque is inscribed: "B. Lyn Behrens, SM Dean, 1986-1991."10 x 15 c
Turbinen Fabrik A.E.G
No full textOne of [Behrens] earliest designs was for the celebrated turbine factory (1909; see Modern movement, fig. 1; see Buddensieg and others, 1984, pp. 273–81) in Moabit, Berlin, which used an exposed hinged steel frame—designed with Karl Bernhard (b 1859)—and undecorated masonry cladding on the gable end to create one of the canonical statements of 20th-century architecture, in which transparency and the rhythms of the industrial process were combined with classical monumentality.exterior, top left: side facing Berlichingenstrasse; top right: detail of pilaster resting on its hinge; bottom right: internal wall with alternation between the window and pilaster; bottom left: detail of ground floor pilaster facing the yar
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
An experimental study on the pressure dependence of viscosity in silicate melts
No full textThe effect of pressure on melt viscosity was investigated for five compositions along the join An(CaAl2Si2O8)–Di(CaMgSi2O6) and four alkali silicates containing lithium, sodium, and potassium in constant ratio of ∼ 1:1:1, but alkali-silica ratios are varying. The experiments were performed in an internally heated gas pressure vessel at pressures from 50 to 400 MPa in the viscosity range from 108 to 1011.5 Pa⋅s using parallel plate viscometry. The polymerized An composition shows a negative pressure dependence of viscosity while the other, more depolymerized compositions of the join An–Di have neutral to positive pressure coefficients. The alkali silicates display neutral to slightly positive pressure coefficients for melt viscosity. These findings in the high viscosity range of 108–1011 Pa⋅s, where pressure appears to be more efficient than in low viscous melts at high temperature, are consistent with previous results on the viscosity of polymerized to depolymerized melts in the system NaAlSi3O8–CaMgSi2O6 by Behrens and Schulze [ H. Behrens and F. Schulze, Am. Mineral. 88, 1351 (2003) ]. Thus we confirm that the sign of the pressure coefficient for viscosity is mainly related to the degree of melt polymerization in silicate and aluminosilicate melts.DFG Grant n.°BE1720/9Published044504-142.3. TTC - Laboratori di chimica e fisica delle rocceJCR Journalope
Letter
No full textDigital copies were created from a selection of items in the original hard copy Albert Coates collection (PDV 4) held in DOMUS in the Stellenbosch University Music Library.Correspondence with Vera de Villiers [Vera Coates]. Letter from Richard Behrens, University of Stellenbosch. Confirmation of items sent for concert performance
Dr. Lyn Behrens, President
No full textB. Lyn Behrens, MBBS, was Dean of the School of Medicine from 1986 to 1991; Interim Dean from 1993 to 1994, President of Loma Linda University from 1990 to 2001; and President of Loma Linda University Medical Center from 1999 to 2008. In 1995, she was appointed President of Adventist Health Systems/Loma Linda (AHS/LL). And in 1997, she became president and CEO of Loma Linda University Adventist Health Sciences Center (LLUAHSC), the successor corporation of AHS/LL and the new umbrella organization for Loma Linda University and Loma Linda University Medical Center. She served as president of Loma Linda University Behavioral Medicine Center from 1999 to 2004. In 2008, Dr. Behrens was named President Emerita of LLUAHSC (now Loma Linda University Health).12.5 x 18 c
Professor Norton B. Smith\u27s practical treatise on the breaking and taming of wild and vicious horses
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