Ethnic identity in West Africa. Historical perspectives on America\u27s discourse about ethnicity

Political Correctness and Affirmative Action are core issues of America’s difficult search for cultural identity. However, a policy of differential treatment of categorized ethnicities is likely to cause complex and dynamic identities to become static and one-dimensional. This in turn is a factor of social destabilization. The basic assumption of ethnicity as a fixed social or racial category is not only an over-simplification, but a policy focussing on group rights changes the character of the groups themselves and even stimulates growing isolation between them. The paper’s argumentation is based on observations on the historical process of group identity-forming in Western African societies. They provide the example of how ethnic identity is a matter of dynamic constellations, of change, of interaction, of conscious and unconscious negotiation and choice, both on the group level and on the individual level.Hintergrund der Argumentation des Autors "ist die Bewegung für \u27Political Correctness\u27 und \u27Affirmative Action\u27 in den USA. Als eine ihrer Konsequenzen impliziert sie den grundsätzlichen Antagonismus zwischen verschiedenen kulturellen Identitäten, der im gegebenen politischen Kontext virulent wird und den anderen nicht mehr an der eigenen Kultur teilhaben läßt bzw. zur Wahl für oder gegen zwingt. Gestützt auf eigene empirische Untersuchungen und ethnographische Feldforschung über die Normalität mehrsprachiger und plurikultueller Enkulturation in traditionellen afrikanischen Gesellschaften vertritt er das Konzept nicht-determinierter, dynamischer, nicht-ausschließlicher kultureller Identitäten." (DIPF/Orig.

The influence of nutrient concentration on algal biomass and invertebrate communities in agricultural streams : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Ecology at Massey University, Palmerston North, New Zealand

High nutrient inputs have generally been identified as responsible for the degradation of lowland rivers and lakes in New Zealand and internationally. Nutrients have been shown to influence algal community growth rate and composition. In turn algae can have strong effects on invertebrate communities (density, richness, composition, distribution, structure and function). This study investigates the effect of nutrients on algal biomass and higher trophic levels to determine the importance of nutrient loading on stream ecosystems. Twenty six agricultural streams were surveyed in the Manawatu region in February, 2002. Algal biomass was greater in streams with high nitrate levels. Invertebrate communities differed in terms of the quantitative macroinvertebrate community index (QMCI), Ephcmeroptera, Plecoptera and Trichoptera (EPT) individuals and taxa between sites with high and low algal biomass. Regression analysis was used to relate the "quality" of the invertebrate community to stream algal biomass. At 13.μg/cm2 of chlorophyll a there was a dramatic shift in invertebrate community composition to more pollution tolerant taxa. In the Hawke's Ray region nutrient concentration was experimentally increased in 3 low order streams in the summer of 2002/2003. Increased nutrient concentration did not affect stream algal biomass. There were however changes in the proportions of EPT in the enriched community. I propose that these changes in EPT were in response to increased algal growth rates and constrained any increase in algal biomass. Therefore changes in landuse intensity may affect invertebrate community structure

On Quantum Algorithms for Noncommutative Hidden Subgroups

Quantum algorithms for factoring and discrete logarithm have previously been generalized to finding hidden subgroups of finite Abelian groups. This paper explores the possibility of extending this general viewpoint to finding hidden subgroups of noncommutative groups. We present a quantum algorithm for the special case of dihedral groups which determines the hidden subgroup in a linear number of calls to the input function. We also explore the difficulties of developing an algorithm to process the data to explicitly calculate a generating set for the subgroup. A general framework for the noncommutative hidden subgroup problem is discussed and we indicate future research directions.Comment: 13 pages, no figures, LaTeX2

Tutor roles in collaborative group work

Collaborative assessed group work can create challenges for both students and tutors. Both the benefits and challenges of assessed group work are discussed with particular reference to the context of teacher education. The relevance of action research, the concept of living theory and the ethical nature of tutor practice in relation to group work are considered. The concept of 'role' is used to analyse aspects of tutor practice based on outcomes from an extended process of action research. A description of one role system of different tutor roles is given as a prompt for reflection and self-study

A Quantum Observable for the Graph Isomorphism Problem

Suppose we are given two graphs on $n$ vertices. We define an observable in the Hilbert space \Co[(S_n \wr S_2)^m] which returns the answer ``yes'' with certainty if the graphs are isomorphic and ``no'' with probability at least $1-n!/2^m$ if the graphs are not isomorphic. We do not know if this observable is efficiently implementable.Comment: 5 pages, no figure

Correction: Limit theorems for coupled continuous time random walks

Correction to "Limit theorems for coupled continuous time random walks" (Ann. Probab. 32 (2004) 730-756).Comment: Published in at http://dx.doi.org/10.1214/10-AOP635 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org

Head Capsule Widths as an Indicator of the Larval Instar of Codling Moth (Lepidoptera: Olethreutidae)

Head capsule width was a reliable indicator of larval instar in a strain of Michigan codling moths, Cydia pomonella. Head capsules were 0.33, 0.50, 0.82, 1.18 and 1.55 mm in width from first to fifth instar respectively. Development as measured by days and degree days was much more variable than head capsule width in estimating larval instars