139,839 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
El Leloir que conocí. Entrevista al Dr. Nicolás H. Behrens en el marco del proyecto Houssay y Leloir
No full textEntrevista al Dr. Nicolás H. Behrens en el marco del proyecto Houssay y Leloir.OriginalFil: Behrens, Nicolás H..ColorMatías A. Loewy (Entrevista); Esteban D. Rosso (Producción Audiovisual) y Santiago Alventosa (Técnica Audiovisual)1 videograbación digitalLFL-ACE-M. Entrevistas, grabaciones, y otros materiales multimedia sobre LFLUnidad documental simpleAR-HYL-201
Dissertatio Academica De Societatibus Tam Primis Et Minoribus, Quam Civilibus, Illarumque Cum His Convenientia Et Analogia : Quam Civilibus, Illarumque Cum His Convenientia Et Analogia / Quam ... In Illustri Academia Iulia Praeside Johanne Bartholdo Niemeiero ... Publico eruditorum examini submittet Johann Matthias Behrens Cellensis Autor & Respondens ... MDCXXCIV.
No full textDISSERTATIO ACADEMICA DE SOCIETATIBUS TAM PRIMIS ET MINORIBUS, QUAM CIVILIBUS, ILLARUMQUE CUM HIS CONVENIENTIA ET ANALOGIA : QUAM CIVILIBUS, ILLARUMQUE CUM HIS CONVENIENTIA ET ANALOGIA / QUAM ... IN ILLUSTRI ACADEMIA IULIA PRAESIDE JOHANNE BARTHOLDO NIEMEIERO ... PUBLICO ERUDITORUM EXAMINI SUBMITTET JOHANN MATTHIAS BEHRENS CELLENSIS AUTOR & RESPONDENS ... MDCXXCIV.
Dissertatio Academica De Societatibus Tam Primis Et Minoribus, Quam Civilibus, Illarumque Cum His Convenientia Et Analogia : Quam Civilibus, Illarumque Cum His Convenientia Et Analogia / Quam ... In Illustri Academia Iulia Praeside Johanne Bartholdo Niemeiero ... Publico eruditorum examini submittet Johann Matthias Behrens Cellensis Autor & Respondens ... MDCXXCIV. (1)
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Zum Gedächtniß der am 22. Febr. d. J. verstorbenen Frau Dorothea Hensler, geb. Behrens
No full textZUM GEDÄCHTNISS DER AM 22. FEBR. D. J. VERSTORBENEN FRAU DOROTHEA HENSLER, GEB. BEHRENS
Zum Gedächtniß der am 22. Febr. d. J. verstorbenen Frau Dorothea Hensler, geb. Behrens ([1])
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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
D/H exchange in pure and Cr-doped enstatite: implications for hydrogen diffusivity
No full textThe kinetics of hydrogen diffusion in enstatite was studied by hydrogen-deuterium exchange experiments in the range of 1-5,000 bar and 700-850 degrees C using synthetic single crystals of pure and Cr-doped enstatites. The OH- and OD-content in the samples was quantified after each thermal treatment with Fourier transformed infrared spectroscopy. H-D-exchange rates were measured parallel to the three crystallographic axes. In addition, in order to visualize diffusion profiles, OH and OD were mapped for some samples, utilizing synchrotron IR micro-spectroscopy. Hydrogen self-diffusivities derived from D/H exchange experiments at one atmosphere are very similar to the chemical diffusivity of hydrogen in natural Fe-bearing orthopyroxene, which was reported previously (Stalder and Skogby 2003) to exhibit a small, but significant anisotropy (D[001] > D[100] > D[010]). Activation energies are estimated to be 211 (+/- 31) kJ/mol for diffusion parallel [100] and 185 (+/- 28) kJ/mol for diffusion parallel [010]. Lattice diffusion of hydrogen is decelerated by more than one order of magnitude when Cr is dissolved in enstatite. In comparison to the chemical composition, pressure seems to have only a minor influence on hydrogen diffusion. Compared to other minerals in the Earth's upper mantle, enstatite exhibits the highest activation energy for hydrogen diffusion, suggesting faster diffusion than in other mafic minerals at mantle temperatures, but slower diffusion at crustal conditions. Thus under upper mantle conditions, physical properties that are expected to be influenced by hydrogen mobility, such as electrical conductivity, may in enstatite be more intensely affected by the presence of hydrogen than in other upper mantle minerals
Nembrotha milleri Gosliner and Behrens 1997
No full textNembrotha milleri Gosliner and Behrens, 1997 (Figure 24 D) Material examined. One specimen. MB28-005049, NSS, 21 Apr. 2017, 8m, 39mm. Habitats. Tropical coral reef crawling on sand. Occurrences. Nuarro. Geographic distribution. Indo-west Pacific. Japan (Pola et al. 2008), Indonesia, Philippines (Gosliner & Behrens 1997), Australia (Pola et al. 2008), Tanzania (Debelius & Kuiter 2007) and Mozambique.Published as part of Tibiriçá, Yara, Pola, Marta & Cervera, Juan Lucas, 2017, Astonishing diversity revealed: an annotated and illustrated inventory of Nudipleura (Gastropoda: Heterobranchia) from Mozambique, pp. 1-133 in Zootaxa 4359 (1) on page 72, DOI: 10.11646/zootaxa.4359.1.1, http://zenodo.org/record/106916
Evidenzbasierung pflegerischen Handelns als Herausforderung für die Pflegeforschung
No full textSchaeffer D, Behrens J, Görres S. Evidenzbasierung pflegerischen Handelns als Herausforderung für die Pflegeforschung. In: Schaeffer D, Behrens J, Görres S, eds. Optimierung und Evidenzbasierung pflegerischen Handelns. Ergebnisse und Herausforderungen der Pflegeforschung. München: Juventa; 2008: 7-10
Hercynia Curiosa, oder Curiöser Hartz-Wald/ Das ist Sonderbahre Beschreibung und Verzeichnis Derer Curiösen Hölen/ Seen/ Brunnen/ Bergen/ und vielen andern an- und auff dem Hartz vorhandenen Denckwürdigen Sachen : mit unterschiedenen Nützlichen und Ergetzlichen Medicinischen/ Physicalischen und Historischen Anmerckungen
No full textdenen Liebhabern solcher Curiositäten zur Lust heraus gegeben von D. Georg Henning Behrens, Physico Ordin. Subordin. in NordhausenKupfertitelAus dem Vorbesitz der Naturforschenden Gesellschaft in Züric
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