2,156 research outputs found

    Being Nomadic in a Neo World

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    Teachers are often classified into groups based on performance, identity, and through the use of metaphors. This article utilizes a post structuralist lens to build on past research by posing the classification of teachers into three personas: the nematode, neo, and nomad. These personas are not always chosen by the teacher, but instead are reactions to environments, colleagues and administrators, and education mandates. Standardization and accountability, which are forced on education by neoliberal policies, affect teachers’ identities in negative ways and often cause them to be the type of teacher they never desired to be to their students. Utilizing Deleuze’s theory of the nomad, the article explores the nomad as the persona that teachers should assume and offers suggestions of how teachers can be exposed to discourses that are not hijacked by standardization and accountability

    LINEAR-PLATEAU REGRESSION ANALYSIS AND ITS APPLICATION TO SELENITE ADSORPTION RATE

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    Simple computational methods are presented which facilitate fitting regression models to response data exhibiting a plateau effect. The iterative statistical program (called PLATFOR) is written in FORTRAN (a SAS version is also available), and produces all relevant regression statistics, plots, and information on goodness of fit. The presented procedures are empirically valuable, since linear-plateau models have many useful applications in agriculture, especially in soil fertility and soil chemistry experiments. The technique was employed in an experiment designed to determine the effect of soil volcanic ash content on selenite adsorption. Ion chromatographic methods were used to investigate selenite adsorption in three acidic North Idaho surface soils of varying ash content. Equilibration periods of 0.5 to 12.0 hours were evaluated and the time required to reach maximum adsorption was determined using the PLATFOR program. It was concluded that both the rate and magnitude of selenite adsorption were influenced by soil volcanic ash content

    Technology and Teaching: A Conversation among Faculty Regarding the Pros and Cons of Technology

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    Technology is often touted as the savior of education (Collins & Haverson, 2009). However, is technology the panacea that it is made out to be? This paper is an extended conversation among a group of faculty members at three different universities and their attitudes and beliefs about technology and education. Three professors shared their pro-technology stance and three took a less favorable view. The contents of the conversation were then analyzed by a neutral party to extract the various themes that emerged. What was discovered was that were three major threads to the conversation: technology and educational access, online education, and technology and instructional strategies. While there was little agreement, throughout the evolution of the conversation, both sides began to understand each other a little more

    Where did the rats of big South Cape Island come from?

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    The ship rat invasion of Big South Cape Island/Taukihepa in the 1960s was an ecological catastrophe that marked a turning point for the management of rodents on offshore islands of New Zealand. Despite the importance of this event in the conservation history of New Zealand, and subsequent major advances in rodent eradication and biosecurity, the source and pathway of the rat invasion of Big South Cape Island has never been identified. Using modern molecular methods on contemporary and historical tissue samples, we identify the mitochondrial DNA (mtDNA) haplotype of ship rats (Rattus rattus) on Big South Cape Island and compare it to that of ship rats in the neighbouring regions of Stewart Island/Rakiura and southern New Zealand, all hypothesised as possible source sites for the invasion. We identify two haplotype clusters, each comprising three closely related haplotypes; one cluster unique to Stewart Island, and the other found in southern New Zealand and elsewhere. By a process of elimination we rule that the ship rat invasion of Big South Cape Island was neither by swimming nor boat transport from Stewart Island, and is unlikely to have come from the south coast ports of New Zealand. However, because the ship rat haplotype found on Big South Cape Island is cosmopolitan to New Zealand’s South Island and elsewhere, we can only confirm that the invasion likely originated from some distance, but are not able to identify the invasion source more precisely. An unexpected consequence of our study is the discovery of five new mtDNA haplotypes for R. rattus that have not been previously reported

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    Stochastic population growth in spatially heterogeneous environments

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    Classical ecological theory predicts that environmental stochasticity increases extinction risk by reducing the average per-capita growth rate of populations. To understand the interactive effects of environmental stochasticity, spatial heterogeneity, and dispersal on population growth, we study the following model for population abundances in nn patches: the conditional law of Xt+dtX_{t+dt} given Xt=xX_t=x is such that when dtdt is small the conditional mean of Xt+dtiXtiX_{t+dt}^i-X_t^i is approximately [xiμi+j(xjDjixiDij)]dt[x^i\mu_i+\sum_j(x^j D_{ji}-x^i D_{ij})]dt, where XtiX_t^i and μi\mu_i are the abundance and per capita growth rate in the ii-th patch respectivly, and DijD_{ij} is the dispersal rate from the ii-th to the jj-th patch, and the conditional covariance of Xt+dtiXtiX_{t+dt}^i-X_t^i and Xt+dtjXtjX_{t+dt}^j-X_t^j is approximately xixjσijdtx^i x^j \sigma_{ij}dt. We show for such a spatially extended population that if St=(Xt1+...+Xtn)S_t=(X_t^1+...+X_t^n) is the total population abundance, then Yt=Xt/StY_t=X_t/S_t, the vector of patch proportions, converges in law to a random vector YY_\infty as tt\to\infty, and the stochastic growth rate limtt1logSt\lim_{t\to\infty}t^{-1}\log S_t equals the space-time average per-capita growth rate \sum_i\mu_i\E[Y_\infty^i] experienced by the population minus half of the space-time average temporal variation \E[\sum_{i,j}\sigma_{ij}Y_\infty^i Y_\infty^j] experienced by the population. We derive analytic results for the law of YY_\infty, find which choice of the dispersal mechanism DD produces an optimal stochastic growth rate for a freely dispersing population, and investigate the effect on the stochastic growth rate of constraints on dispersal rates. Our results provide fundamental insights into "ideal free" movement in the face of uncertainty, the persistence of coupled sink populations, the evolution of dispersal rates, and the single large or several small (SLOSS) debate in conservation biology.Comment: 47 pages, 4 figure
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