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Search Results: 1 - 10 of 854 matches for " Retha Meier "
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The Safety of Science Activities in an Inclusive Elementary Classroom  [PDF]
Retha Meier, Nikki L. Murdick, Cara Lytle
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29046
Abstract: As elementary teachers engage their students in scientific inquiry, they often turn to the internet as a resource for rapidly locating scientific activities to use in an inclusive classroom. In these circumstances, however, how can the elementary level teacher know whether the science activities are safe? Even if safety is included within the activities, how does the elementary level teacher know if all safety issues have adequately been addressed? The purpose of this article is to highlight potential safety concerns involving elementary science activities and to provide a checklist to use when evaluating the safety of science activities prior to implementing these activities within the inclusive classroom. If the use of the checklist calls attention to a safety concern in a particular activity, we suggest trying to modify the activity first to make it safe. If the activity cannot be modified to eliminate all safety concerns, then it is recommended that the elementary level teacher search for a different activity that does not pose any hazards. The checklist and supporting back-ground information provided within this paper is intended to help teachers confidently provide a positive learning environment in which all students can safely learn science through inquiry and exploration.
The Safety of Physics Science Activities in a High School Physics Classroom  [PDF]
Jennifer Bolla, Retha Meier, Elizabeth Meyr
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.48017
Abstract: High school physics teachers often turn to various resources, including the Internet, as they search for engaging physics activities for their students. An important question, especially for new physics teachers, concerns the safety of these activities. Have safety issues been adequately addressed within these activities? The purpose of this article is to emphasize potential safety issues involving high school physics projects as well as to provide a checklist for physics teachers to use as they evaluate activities. If the activity is deemed to contain safety issues, physics teachers are encouraged to attempt to modify the activity to make it safe. If the activity cannot be modified for safety purposes, then it is recommended that the physics teacher search for a different activity. The intention of this article is to provide high school physics teachers with safety information that can be used in preparing safe, inquiry-based, hands-on, engaging and topic-appropriate physics activities for their students.
Eigenvalues and Stability Properties of Multiplication Operators and Multiplication Semigroups
Retha Heymann
Mathematics , 2012,
Abstract: We investigate uniform, strong, weak and almost weak stability of multiplication semigroups on Banach space valued $L^p$-spaces. We show that, under certain conditions, these properties can be characterized by analogous ones of the pointwise semigroups. Using techniques from selector theory, we prove a spectral mapping theorem for the point spectra of the pointwise and global semigroups and apply this as a major tool for determining almost weak stability.
The Relationship Between Entrepreneurial Intensity and Shareholder Value Creation
Pierre Erasmus,Retha Scheepers
Managing Global Transitions , 2008,
Abstract: Innovation and entrepreneurship have long been regarded as sources of value and wealth creation. Previous research has shown that there is a positive relationship between enterprises’ levels of entrepreneurship and their financial performance. Little research, however, has hitherto focused on measuring the relationship between entrepreneurship and shareholder value creation. In this study the relationship between the entrepreneurial intensity and the shareholder value created by an enterprise is investigated. An adapted corporate entrepreneurship (CE) measurement instrument is applied in order to gauge entrepreneurial intensity, while shareholder value creation is measured by the market adjusted total share return (TSR) and the value based financial performance measure Economic Value Added (EVA). The study is conducted for a sample of enterprises listed in the industrial sector of the Johannesburg Securities Exchange (JSE) for the period 2003–2005. The contribution of the study is the focus on the relationship between entrepreneurial intensity and shareholder value creation, rather than purely on the accounting-based financial performance of an enterprise.
Consistency of Extended Nelson-Siegel Curve Families with the Ho-Lee and Hull and White Short Rate Models  [PDF]
Patricia Kisbye, Karem Meier
Journal of Mathematical Finance (JMF) , 2017, DOI: 10.4236/jmf.2017.74050
Abstract: Nelson and Siegel curves are widely used to fit the observed term structure of interest rates in a particular date. By the other hand, several interest rate models have been developed such their initial forward rate curve can be adjusted to any observed data, as the Ho-Lee and the Hull and White one factor models. In this work we study the evolution of the forward curve process for each of these models assuming that the initial curve is of Nelson-Siegel type. We conclude that the forward curve process produces curves belonging to a parametric family of curves that can be seen as extended Nelson and Siegel curves. We show that the forward rate curve evolution has a linear or an exponential growth, depending on the particular short rate interest model. We applied the results to Argentinian short and forward rates obtained from the Lebac’s bills yields using the Hull and White short rate model, showing a good estimation of the observed forward rate curve for near dates when the initial forward curve is adjusted with a Nelson and Siegel one.
Benzoxetes and Benzothietes ? Heterocyclic Analogues of Benzocyclobutene
Herbert Meier
Molecules , 2012, DOI: 10.3390/molecules17021548
Abstract: Benzo-condensed four-ring heterocycles, such as benzoxetes 1 and benzothietes 3 represent multi-purpose starting compounds for the preparation of various higher heterocyclic ring systems. The thermal or photochemical valence isomerizations between the benzenoid forms 1,3 and the higher reactive o-quinoid structures 2,4 provide the basis for the synthetic applications. On the other hand, this valence isomerization impedes in particular the generation and storage of 1 because the thermal equilibrium 1 2 is completely on the side of 2. Thus, the number of erroneous or questionable benzoxete structures published to date is surprisingly high. On the contrary, the thermal equilibrium 3 4 is on the side of the benzothietes 3, which makes them easily accessible, especially by different flash vacuum pyrolysis techniques. The present article gives a survey of the preparations of 1 and 2, and tries to stimulate their use in synthetic projects. Naphtho-condensed and higher condensed compounds and compounds with an exocyclic C=O or S=O double bond (lactones, thiolactones, sulfoxides and sulfones) are not covered in this article.
Aspectos de la flora y vegetación del monumento natural cerro Platillón (Juan Germán Roscio), Estado Guárico, Venezuela
Acta Botánica Venezuelica , 2005,
Abstract: cerro platillon is the highest elevation of the inner chain of the central coastal cordillera (aprox. 1930 m asl). the monumento natural cerro platillon covers an altitudinal range between 600 and 1930 m asl. it includes a variety of different vegetation types such as secondary savannas, forests (including cloud forests), shrublands, dwarf shrublands on exposed ridges and open vegetation on rocky outcrops. there could be made from the aprox. 330 collections 174 new reports for the guarico state. bocconia integrifolia humb. & bonpl. (papaveraceae), a common species of the andes, is reported here for the first time for the coastal cordillera of venezuela. new reports for the inner branch of the central coastal cordillera have principally been collected at higher altitudes of the monument: on the rocky outcrops: bidens cf. triplinervia kunth, cheilanthes marginata kunth, daucus montanus humb. & bonpl. ex spreng., echeveria bicolor (kunth) walther, elaphoglossum cf. meridense (klotzsch) moore, huperzia hartwegiana (spring) trevis., mitracarpus frigidus var. andinus steyerm., monochaetum bonplandii (kunth) naudin; in the cloud forest zone: vaccinium corymbodendron dunal, bejaria aestuans mutis ex l., lepechinia bullata (kunth) epling, loxoscaphe theciferum (mett.) t. moore, mauria heterophylla kunth, minthostachys mollis (kunth) griseb., morella pubescens (humb. & bonpl. ex willd.) wilbur, oreopanax aff. reticulatus decne. & planch. cerro platillon is of considerable floristic and phytogeographical interest because of its relative proximity to the andes, its elevation, the rocky outcrops and for its geological composition. cerro platillon was declared monumento natural juan german roscio in 1987 because of its importance as a watershed for several water reservoirs, of which the most important is the camatagua reservoir, that provides caracas with water. the main threats to the monument and the surrounding areas are fires and land invasions, that may seriously affect the
Contribución al conocimiento de Persicaria nepalensis (Meisn.) H.Gross y P. capitata (Buch.-Ham. ex D.Don) H.Gross, especies invasoras en el Parque Nacional El Avila, Venezuela
Acta Botánica Venezuelica , 2006,
Abstract: two exotic species of the polygonaceae family (persicaria capitata and p. nepalensis) are described, illustrated and reported for the first time for the ávila national park. p. capitata locally dominates landslide areas devastated by the heavy rains occurred in december 1999. furthermore, it is common in the cracks of the walls and along the roads of the national park. p. nepalensis is a noxious weed in cultivation areas (especially in strawberry fields) and along roads. seven phytosociological releves document the habitat of these species.
Chungará (Arica) , 2001, DOI: 10.4067/S0717-73562001000100013
Abstract: for centuries, museums around the world have exhibited human mummified remains. in many instances the remains were placed in the exhibit cases without an initial conservation assessment. over time, the mummified remains decay in their cases without proper maintenance. the end result is total loss of integrity within the materials. often times, museums lack conservation specialists, and exhibition staff not trained in conservation does the maintenance of mummies. these museum personnel need to understand the signs of decomposition so that they can detect early signs of conservation problems for proper maintenance over time. they must also make an initial assessment to prepare and maintain mounts that optimizes the conservation of the material while on display. presented is an overview of a conservation assessment that the exhibition professional should be aware of in exhibiting human mummified remains
Enhancing intercultural understanding using e-learning strategies
C Meier
South African Journal of Education , 2007,
Abstract: Intercultural understanding is a prerequisite for peaceful local and global citizenship, especially in South African society where prejudice and negative stereotypes were previously the order of the day because of official separatism. It is therefore crucial to teach intercultural understanding in South Africa. I report with commentary on a tripartite initiative, between SchoolNet South Africa, the University of Jyv skyl (Finland) and Unisa's School of Education, to implement an Internet-supported education programme entitled ‘Intercultural understanding — e-learning application in education'. The project comprised an encounter in the form of electronic correspondence between learners from five previously disadvantaged South African schools and learners from seven schools in Finland. The objectives of the project included critical scrutiny by learners of the cultures of South Africa and Finland with a view to finding ways of fostering intercultural understanding. Learners in South African schools exchanged messages with their Finnish counterparts online and then published articles on their experiences in an eJournal. Analysis and interpretation of the content of these articles showed that the project obscured rather than improved intercultural understanding.
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