Teacher Resistance to Implementation

Excerpt: When teachers first confront the requirement that they implement some new idea or method into their teaching, they can respond in any of several ways. If we view on a continuum the many possible responses to such a requirement, we will see on one end those teachers who flatly refuse to make any changes. They may rationalize that their pedagogy requires no change or that they already know better than curriculum designers and consultants what needs to occur in their own classrooms and\u27 even in classrooms in general. Jumping to the other extreme of our continuum, we find those teachers who chase down and study all the material they can find on the new method, who end up leading workshops on how to implement the new method, and whose sample classroom lessons or units eventually circulate in print so that others might see what successful implementation actually looks like. Of course, we recognize these extremes as extremes; these illustrations fail to represent the more moderate and more mixed reactions of the majority of teachers. Most teachers fall between my two characterizations. And most teachers likely experience feelings of willingness to implement the method and, simultaneously, frustration over exactly how to go about irnplementing curriculum changes that come their way (Doyle and Ponder 1978, Sieber 1972)

Global influences on UK manufacturing prices: 1970-2000

This paper presents substantial new evidence on the competitive process that links together industrial economic and international economics. Our time-series data base concerns manufactured product prices and their domestic and international determinants. We identity cointegrating relationships, using single equation and multivariate methods. We find that both market imperfections, largely ignored in international economics, and international factors, mostly neglected in industrial economics, should be jointly incorporated into pricing analysis. The significance of global factors varies markedly: differentiated-product sectors respond little to foreign price signals. Our findings are relevant to many fields within economics, including the transmission of inflation

Numerical Treatment of Anisotropic Radiation Field Coupling with the Relativistic Resistive Magnetofluids

We develop a numerical scheme for solving a fully special relativistic resistive radiation magnetohydrodynamics. Our code guarantees conservations of total mass, momentum and energy. Radiation energy density and radiation flux are consistently updated using the M-1 closure method, which can resolve an anisotropic radiation fields in contrast to the Eddington approximation as well as the flux-limited diffusion approximation. For the resistive part, we adopt a simple form of the Ohm's law. The advection terms are explicitly solved with an approximate Riemann solver, mainly HLL scheme, and HLLC and HLLD schemes for some tests. The source terms, which describe the gas-radiation interaction and the magnetic energy dissipation, are implicitly integrated, relaxing the Courant-Friedrichs-Lewy condition even in optically thick regime or a large magnetic Reynolds number regime. Although we need to invert $4\times 4$ (for gas-radiation interaction) and $3\times 3$ (for magnetic energy dissipation) matrices at each grid point for implicit integration, they are obtained analytically without preventing massive parallel computing. We show that our code gives reasonable outcomes in numerical tests for ideal magnetohydrodynamics, propagating radiation, and radiation hydrodynamics. We also applied our resistive code to the relativistic Petschek type magnetic reconnection, revealing the reduction of the reconnection rate via the radiation drag.Comment: 16 pages, 1 table, 13 Figures, accepted for publication in Ap

Geodesics in the static Mallett spacetime

Mallett has exhibited a cylindrically symmetric spacetime containing closed timelike curves produced by a light beam circulating around a line singularity. I analyze the static version of this spacetime obtained by setting the intensity of the light to zero. Some null geodesics can escape to infinity, but all timelike geodesics in this spacetime originate and terminate at the singularity. Freely falling matter originally at rest quickly attains relativistic velocity inward and is destroyed at the singularity.Comment: 5 page

Transition States in Protein Folding Kinetics: The Structural Interpretation of Phi-values

Phi-values are experimental measures of the effects of mutations on the folding kinetics of a protein. A central question is which structural information Phi-values contain about the transition state of folding. Traditionally, a Phi-value is interpreted as the 'nativeness' of a mutated residue in the transition state. However, this interpretation is often problematic because it assumes a linear relation between the nativeness of the residue and its free-energy contribution. We present here a better structural interpretation of Phi-values for mutations within a given helix. Our interpretation is based on a simple physical model that distinguishes between secondary and tertiary free-energy contributions of helical residues. From a linear fit of our model to the experimental data, we obtain two structural parameters: the extent of helix formation in the transition state, and the nativeness of tertiary interactions in the transition state. We apply our model to all proteins with well-characterized helices for which more than 10 Phi-values are available: protein A, CI2, and protein L. The model captures nonclassical Phi-values 1 in these helices, and explains how different mutations at a given site can lead to different Phi-values.Comment: 26 pages, 7 figures, 5 table

ASCA Slew Survey

We are systematically analyzing ASCA GIS data taken during the satellite attitude maneuver operation. Our motivation is to search for serendipitous hard X-ray sources and make the ASCA Slew Survey catalog. During its operational life from 1993 February to 2000 July, ASCA carried out more than 2,500 maneuver operations, and total exposure time during the maneuver was ~415 ksec after data screening. Preliminary results are briefly reported.Comment: Proceedings for "X-ray surveys in the light of new observations", Santander (Spain), 2002 September. 1 pag