Assessing the status of urban public school desegregation :

A preliminary examination of desegregation techniques revealed that among elementary schools the combination of pairing and clustering with rezoning proved most successful in reducing racial isolation (operationalized as a change in the index of dissimilarity). For secondary schools the most effective technique was rezoning. These two techniques were associated, in the bivariate case, with the lowest amount of white enrollment loss as well. A multiple regression analysis also showed the most effective desegregation technique to be of some importance (although not statistically significant) in achieving desegregation success when various external, community, and district level forces were taken into account. In the multivariate case, the specific technique was of greater import at the elementary than the secondary level. Other features of the desegregation process, especially support by school officials, were important predictors of desegregation success as well, although the most powerful forces were federal coercion (positive) and size of district (negative). A multivariate analysis of white enrollment change for these 52 districts confirmed recent research that school desegregation does produce a significant one-time decline in white student enrollment. The most important predictor of white student withdrawal was percentage black in the school system.The research concludes that desegregation process variables are important contributors to desegregation success, and certain desegregation techniques may work better than others.Employing a relatively new data collection and aggregation method known as the case survey method and a theoretical framework that conceptualizes school desegregation as a public policy that must be implemented at the local level, an attempt is made to assess the impact of three types of influence--external forces, school district characteristics, and desegregation process variables (including desegregation strategies)--on two school desegregation outcomes: the success of school districts in ending racial isolation (desegregation success) and white enrollment decline (generally referred to as "white flight")

The Ideal Characteristics of Foxfire Type Projects as Perceived by Teacher Advisors

Eliot Wigginton, after six weeks of classroom teaching at the Rabun-Gap Nacoochee School in rural north Georgia, was frustrated because he found that his students were not interested in the courses he was prepared to teach. He had graduated from Cornell University in May 1966 with a master\u27s degree and had come to Rabun-Gap to instruct mountain children in English and geography. He realized, fortunately, that if his students were bored it was he who had bored them. He believed that it might be better him to seek another career (Wigginton, 1972)

Experimental investigation of high-dimensional quantum key distribution protocols with twisted photons

Quantum key distribution is on the verge of real world applications, where perfectly secure information can be distributed among multiple parties. Several quantum cryptographic protocols have been theoretically proposed and independently realized in different experimental conditions. Here, we develop an experimental platform based on high-dimensional orbital angular momentum states of single photons that enables implementation of multiple quantum key distribution protocols with a single experimental apparatus. Our versatile approach allows us to experimentally survey different classes of quantum key distribution techniques, such as the 1984 Bennett \& Brassard (BB84), tomographic protocols including the six-state and the Singapore protocol, and to investigate, for the first time, a recently introduced differential phase shift (Chau15) protocol using twisted photons. This enables us to experimentally compare the performance of these techniques and discuss their benefits and deficiencies in terms of noise tolerance in different dimensions.Comment: 13 pages, 4 figures, 1 tabl

Far-from-equilibrium distribution from near-steady-state work fluctuations

A long-standing goal of nonequilibrium statistical mechanics has been to extend the conceptual power of the Boltzmann distribution to driven systems. We report some new progress towards this goal. Instead of writing the nonequilibrium steady-state distribution in terms of perturbations around thermal equilibrium, we start from the linearized driven dynamics of observables about their stable fixed point, and expand in the strength of the nonlinearities encountered during typical fluctuations away from the fixed point. The first terms in this expansion retain the simplicity of known expansions about equilibrium, but can correctly describe the statistics of a certain class of systems even under strong driving. We illustrate this approach by comparison with a numerical simulation of a sheared Brownian colloid, where we find that the first two terms in our expansion are sufficient to account for the shear thinning behavior at high shear rates.American Society for Engineering Education. National Defense Science and Engineering Graduate Fellowship (32 CRF 168a

Organophosphate toxicosis in chickens: A case report

Two cases of organophosphate toxicity were diagnosed at the University of Arkansas Poultry Science Department poultry research farm in the Spring of 2002. In both cases the birds were being treated with the organophosphate RaVap® for Northern Fowl Mites (Ornithonyssus sylvarium) infestations. A total of 61 birds died and 13 were treated successfully with atropine sulphate

A new species of treehopper in the genus Cladonota Stål (Hemiptera: Membracidae: Membracinae: Hypsoprorini) from Costa Rica, with preliminary observations of its behaviour and natural history

England, Sam J., Flynn, Dawn J., Robert, Daniel (2020): A new species of treehopper in the genus Cladonota Stål (Hemiptera: Membracidae Membracinae: Hypsoprorini) from Costa Rica, with preliminary observations of its behaviour and natural history. Zootaxa 4750 (4): 596-598, DOI: https://doi.org/10.11646/zootaxa.4750.4.1