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Search Results: 1 - 10 of 844 matches for " Eunice;Dorn "
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The number of families of Triatoma dimidiata in a Guatemalan house
Melgar, Sergio;Chávez, Juan José;Landaverde, Patricia;Herrera, Franklin;Rodas, Antonieta;Enríquez, Eunice;Dorn, Patricia;Monroy, Carlota;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000001
Abstract: triatoma dimidiata is an important vector of chagas disease in guatemala. to help understand the biology and population dynamics of the insect, we estimated the number of full sibling families living in one house. forty one families with an average size of 2.17 individuals were detected using random amplification of polymorphic dna-polymerase chain reaction genetic markers. this result suggests high levels of migration of the vector, polyandry, and a significant capability for spreading the disease.
Determinants in Pay-What-You-Want Pricing Decisions—A Cross-Country Study  [PDF]
Tim Dorn, Augustin Suessmair
American Journal of Industrial and Business Management (AJIBM) , 2017, DOI: 10.4236/ajibm.2017.72010
Abstract: Pay-what-you-want (PWYW) pricing has attracted much attention recently. Current research focused on influencing factors and their power across social contexts and countries. This article empirically examines a comprehensive list of 10 empirically tested factors that influence individual price-setting but never have been investigated holistically. Results indicate: (1) some previously assumed influencing factors have stronger moderating effects than do others, and (2) these influences must be interpreted as influential clusters rather than individually, as not all constructs are of significantly differing influence on an individual’s pricing decision. Satisfaction (Cluster 1), price consciousness, and fairness (both Cluster 2) constitute the most crucial moderators, regardless of context. Four country contexts (i.e., Australia, Germany, Poland, United States) revealed further insights about the intercultural perspective of PWYW pricing: Whereas most of the influencing factors/clusters are of comparable importance across the tested countries, loyalty and reputation (Cluster 6) significantly differed in importance depending on country.
A Mixed Convection Boundary Layer Flow over a Vertical Wall in a Porous Medium, with Exponentially Varying Fluid Viscosity  [PDF]
Eunice Mureithi
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.28087

This study investigates a mixed convection boundary layer flow over a vertical wall embedded in a highly porous medium. The fluid viscosity is assumed to decrease exponentially with temperature. The boundary layer equations are transformed into a non-similar form using an appropriate non-similar variable ξ and a pseudo-similar variable η. The non-similar equations are solved using an efficient local non-similarity method. The effect of viscosity variation parameter on the heat transfer, skin friction and the velocity and temperature distribution within the boundary layer is investigated. The viscosity variation parameter, the viscous dissipation parameter and non-simi-larity variable are shown to have a significant effect on velocity and thermal boundary layer and also on the skin friction coefficient and heat transfer at the wall.

America Y2K: The Obsolescence of Educational Reforms
Sherman Dorn
Education Policy Analysis Archives , 2000,
Abstract: The passing of the deadline for fulfillment of the national education goals in the United States (the beginning of 2000) reflects the frequently hyperbolic statements of objectives and the manic pace of school reform efforts over the past two decades. The domination by schools of child and family life has combined with a longstanding reliance on schools to solve social problems to make school reform a politically opportune as well as visible issue. Thus, even if the phrasing of national education goals in the U.S. changes to reflect the passing of the nominal deadline, those pressures will remain.
Comment on Ng's "Wealth Redistribution, Race & Southern Public Schools, 1880-1910"
Sherman Dorn
Education Policy Analysis Archives , 2001,
Abstract: Wherein the author raises criticisms and advances qualifications to the conclusions reached by Kenneth Ng is his article "Wealth Redistribution, Race and Southern Public Schools, 1880-1910.
The Political Legacy of School Accountability Systems
Sherman Dorn
Education Policy Analysis Archives , 1998,
Abstract: The recent battle reported from Washington about proposed national testing program does not tell the most important political story about high stakes tests. Politically popular school accountability systems in many states already revolve around statistical results of testing with high-stakes environments. The future of high stakes tests thus does not depend on what happens on Capitol Hill. Rather, the existence of tests depends largely on the political culture of published test results. Most critics of high-stakes testing do not talk about that culture, however. They typically focus on the practice legacy of testing, the ways in which testing creates perverse incentives against good teaching. More important may be the political legacy, or how testing defines legitimate discussion about school politics. The consequence of statistical accountability systems will be the narrowing of purpose for schools, impatience with reform, and the continuing erosion of political support for publicly funded schools. Dissent from the high-stakes accountability regime that has developed around standardized testing, including proposals for professionalism and performance assessment, commonly fails to consider these political legacies. Alternatives to standardized testing which do not also connect schooling with the public at large will not be politically viable.
High-Stakes Testing and the History of Graduation
Sherman Dorn
Education Policy Analysis Archives , 2003,
Abstract: An historical perspective on high-stakes testing suggests that tests required for high school graduation will have mixed results for the putative value of high school diplomas: (1) graduation requirements are likely to have indirect as well as direct effects on the likelihood of graduating; (2) the proliferation of different exit documents may dilute efforts to improve the education of all students; and (3) graduation requirements remain unlikely to disentangle the general cultural confusion in the U.S. about the purpose of secondary education and a high school diploma, especially confusion about whether the educational, exchange, or other value of a diploma is most important.
No more aggregate NAEP studies? [editorial].
Sherman Dorn
Education Policy Analysis Archives , 2006,
Abstract: This editorial reviews recent studies of accountability policies using National Assessment of Educational Progress (NAEP) data and compares the use of aggregate NAEP data to the availability of individual-level data from NAEP. While the individual-level NAEP data sets are restricted-access and do not give accurate point-estimates of achievement, they nonetheless provide greater opportunity to conduct more appropriate multi-level analyses with state policies as one set of variables. Policy analysts using NAEP data should still look at exclusion rates and the non-longitudinal nature of the NAEP data sets.
The mass term in non-Abelian gauge field dynamics on matrix D-branes and T-duality in the $σ$-model approach
H. Dorn
Physics , 1998, DOI: 10.1088/1126-6708/1998/04/013
Abstract: The formal extension of the T-duality rules for open strings from Abelian to non-Abelian gauge field background leads in a well known manner to the notion of matrix valued D-brane position. The application of this concept to the non-Abelian gauge field RG $\beta $-function of the corresponding $\sigma $-model yields a mass term in the gauge field dynamics on the matrix D-brane. The direct calculation in a corresponding D-brane model does $not$ yield such a mass term, if the Dirichlet boundary condition is implemented as a constraint on the integrand in the defining functional integral. However, the mass term arises in the direct calculation for a D-brane model with dynamically realized boundary condition.
On scheme dependence of gravitational dressing of renormalization group functions
H. Dorn
Physics , 1995, DOI: 10.1016/0920-5632(96)00320-9
Abstract: It is shown that for 2D field theories only the first order coefficient of the gravitationally dressed RG $\beta$-function is scheme independent. This is valid even for matter theories with one dimensionless coupling, where the first two coefficients of the original $\beta$-function are scheme independent.
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