11 resultados para Lisa Ellis
em Universitätsbibliothek Kassel, Universität Kassel, Germany
Resumo:
Using a relativistic selfconsistent correlation diagram a first interpretation of the shape and position of L MO X-rays is given within a quasi-adiabatic model.
Resumo:
The result of the first calculation of a self-consistent relativistic many electron correlation diagram ever done (for the system Au - I) leads to a good agreement of the spectral shape and position of the observed noncharacteristic X-rays within the quasi adiabatic model.
Resumo:
Relativistic molecular calculations within the Dirac-Slater scheme have been used in a study of the electronic structure of 6d-metal superheavy hexafluorides. The theoretical results are compared with calculations and measurements of the homolog 4d- and 5d-metal hexafluorides. Large spin-orbit splitting dominates the electronic structure and even has the same order of magnitude as the crystal-field splitting for the valence electrons for the superheavy molecules. Ionization energies have been calculated using a transition state procedure.
Resumo:
Quasi-molecular X-rays observed in heavy ion collisions are interpreted within a relativistic calculation of correlation diagrams using the Dirac-Slater model. A semiquantitative description of noncharacteristic M X rays is given for the system Au-I.
Resumo:
The aim of this paper is a comprehensive presentation of some important basic and general aspects of the topic applications and modelling, with emphasis on the secondary school level. Owing to the review character of this paper, some overlap with the survey paper Blum and Niss (1989) for ICME-6 in Budapest is inevitable. The paper will consist of three parts. In part 1, I shall try to clarify some basic concepts and remind the reader of a few application and modelling examples suitable for teaching. In part 2, I shall formulate some general aims for mathematics instruction and, on that basis, summarise the most important arguments for and against applications and modelling in mathematics teaching. Finally, in part 3, I shall discuss some relevant instructional aspects resulting from the considerations in part 2.
Resumo:
This paper aims at giving a concise survey of the present state-of-the-art of mathematical modelling in mathematics education and instruction. It will consist of four parts. In part 1, some basic concepts relevant to the topic will be clarified and, in particular, mathematical modelling will be defined in a broad, comprehensive sense. Part 2 will review arguments for the inclusion of modelling in mathematics teaching at schools and universities, and identify certain schools of thought within mathematics education. Part 3 will describe the role of modelling in present mathematics curricula and in everyday teaching practice. Some obstacles for mathematical modelling in the classroom will be analysed, as well as the opportunities and risks of computer usage. In part 4, selected materials and resources for teaching mathematical modelling, developed in the last few years in America, Australia and Europe, will be presented. The examples will demonstrate many promising directions of development.
Resumo:
Organic agriculture requires farmers with the ability to develop profitable agro-enterprises on their own. By drawing on four years of experiences with the Enabling Rural Innovation approach in Uganda, we outline how smallholder farmers transition to organic agriculture and, at the same time, increase their entrepreneurial skills and competences through learning. In order to document this learning we operationalised the Kirkpatrick learning evaluation model, which subsequently informed the collection of qualitative data in two study sites. Our analysis suggests that the Enabling Rural Innovation approach helps farmers to develop essential capabilities for identifying organic markets and new organic commodities, for testing these organic commodities under varying organic farm management scenarios, and for negotiating contracts with organic traders. We also observed several obstacles that confront farmers’ transition to organic agriculture when using the Enabling Rural Innovation approach. These include the long duration of agronomic experimentation and seed multiplication, expensive organic certification procedures and the absence of adequate mechanism for farmers to access crop finance services. Despite prevailing obstacles we conclude that the Enabling Rural Innovation approach provides a starting point for farmers to develop entrepreneurial competences and profitable agro-enterprises on their own.
Resumo:
With globalization and increased connectedness, migration has become a political issue. Nevertheless, without citizenship participation in the political system in the host society is limited. Based on a neo-institutionalist approach and referring to political opportunity structure theory, this paper analyzes differences in means of political participation by migrants in two cities, one in the U.S. and one in Germany. Specific focus is put on the welfare state as one factor potentially influencing forms of participation of migrants. From interviews with migrants, local governments, and organizations, this paper establishes that political participation in the German city, Essen, is more institutionalized than in the U.S. city, Newark, NJ, where demonstrations and rallies play a more significant role. Looking at these findings, this paper explains the differences with a variation in the political opportunity structure between the two cities. Whereas in the conservative-corporatist welfare state, ideas of collective bar-gaining and the conferral of social rights to migrants leads to government-created bodies for migrant participation, in the U.S. city, these bodies do not exist and, therefore, migrants use different means of political participation. Through the conferral of social rights on migrants as well, in Germany, the cleavage between migrants and majority society has been pacified. In the U.S. city, where this is not the case, demonstrations and rallies are more common.
Resumo:
Das Working Paper diskutiert top down initiierte Klimaanpassungspolitik in Nicaragua und präsentiert alternative Akteure der Sensibilisierung für Klimawandel und Partizipationsformen im ländlichen Raum. Aufbauend auf früheren Studien wird dabei angenommen, dass die top down initiierten Partizipationsformen in dem zentralamerikanischen Land keine gleichberechtigten Zugangsmöglichkeiten der Gesellschaftsmitglieder an politischen Verhandlungen erzeugen und strukturelle Exklusionsmechanismen nur durch die BewohnerInnen selbst verändert werden können. Diese Erkenntnisse werden im Working Paper aufgenommen und auf die Fragestellung nach dem Potential von Basisorganisationen analysiert, gerechtere Zugangsmöglichkeiten für ländliche BewohnerInnen zu politischen Verhandlungen und/oder Entscheidungsprozessen zu schaffen. Empirisch basiert die Studie auf der Untersuchung des Beitrags von zwei Basisorganisationen für eine verfahrensgerechte Klimapolitik zur Reduzierung der Ausschlussmechanismen ländlicher Personen(gruppen) und Einbindung lokaler Klimawandelerfahrungen unterschiedlicher sozialer Gruppen.