422 research outputs found

    Partnership agreement

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    Whereas, Carl H. Nau, Stephen G. Rusk and Charles L. Swearingen have been for many years associated as partners under the firm name and style of NAU, RUSK & SWEARINGEN in the general practice of public accounting and have so conducted their business that a goodwill of great value has accrued thereto, and whereas, the said partners desire to provide for the indefinite continuance of said business under the aforesaid firm name through survivors and successors to the end that the goodwill thereof may be preserved, and whereas, the said partners further desire to so organize said business that competent and trusted employees may be taken in either as full partners or on a basis of participation in the profits, new, therefore, this memorandum signed the day and year noted at the end hereofWitnesseth: that the said Carl H. Nau, Stephen G. Rusk and Charles L. Swearingen have agreed upon the following Articles of Partnership. Original item in Boxno. 040

    Book Reviews

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    Book Reviews

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    A comparative study of Mackay-Marg, Durham-Langham and Tonomat tonometry

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    A comparative study of Mackay-Marg, Durham-Langham and Tonomat tonometr

    Upper secondary students’ thinking pathways in cell membrane biology : an evidence-based development and evaluation of learning activities using the Model of Educational Reconstruction

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    This study reports on the theoretical- and empirical-based design and evaluation of cell membrane biology learning activities within the Model of Educational Reconstruction and experiential realism. First, we designed analogy-based learning activities by considering students’ and scientists’ conceptions as described in the literature. Secondly, we carried out two video-taped teaching experiments to study students’ learning processes when interacting with the learning activities. Interpreting students’ conceptual development as thinking pathways enabled us to identify and understand the roots of their learning difficulties. Due to inherent ontological and epistemological presumptions, the students had difficulties in understanding that cell membrane structure determines their two-fold function: to separate and to connect environments in order to maintain living processes. The multiple analogies we employed helped foster conceptual development because they highlighted aspects of the concrete everyday experiences the students already had, but had not thought about. As a result of the learning activities, the students revised their conceptions regarding the terms barrier, gatekeeper and environment and connected these to a more coherent conceptual structure of cell membrane biology. Methods and outcomes of the study may contribute to a better understanding of how this important concept can be brought to science classrooms

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    Confirmation of the existence of coherent orientations of quasar polarization vectors on cosmological scales

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    In order to verify the existence of coherent orientations of quasars polarization vectors on very large scales, we have obtained new polarization measurements for a sample of quasars located in a given region of the three-dimensional Universe where the range of polarization position angles was predicted in advance. For this new sample, the hypothesis of uniform distribution of polarization position angles may be rejected at the 1.8% significance level on the basis of a simple binomial test. This result provides an independent confirmation of the existence of alignments of quasar polarization vectors on very large scales. In total, out of 29 polarized quasars located in this region of the sky, 25 have their polarization vectors coherently oriented. This alignment occurs at redshifts 1-2 suggesting the presence of correlations in objects or fields on Gpc scales. More global statistical tests applied to the whole sample of polarized quasars distributed all over the sky confirm that polarization vectors are coherently oriented in a few groups of 20-30 quasars. Some constraints on the phenomenon are also derived. Considering more particularly the quasars in the selected region of the sky, we found that their polarization vectors are roughly parallel to the plane of the Local Supercluster. But the polarization vectors of objects along the same line of sight at lower redshifts are not accordingly aligned. We also found that the known correlations between quasar intrinsic properties and polarization are not destroyed by the alignment effect. Several possible mechanisms are discussed, but the interpretation of this orientation effect remains puzzling.Comment: Accepted for publication in Astronomy & Astrophysic
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