Growth on the border or bordering on growth ?

Economic development ; Economic conditions - Texas

Why did Texas have a jobless recovery?

Employment ; Immigrants ; Labor market

Preparing Teachers: Highly Qualified to Do What? Editors’ introduction

The No Child Left Behind Act of 2001 has had significant effects on teacher preparation programs, both in terms of changes required for policy compliance and through important program adjustments. These adjustments have largely been made in response to changes in partner schools and districts, where pacing guides, scripted curricula, benchmark testing and program improvement mandates are now the norm. In the context of anticipated robust policy activity in K-12 education and teacher education (e.g., possible re-authorization of the Elementary and Secondary Education Act, adoption of the Common Core Standards, new teacher certification performance assessments, etc.), it is important to understand the ways in which the current federal law, focused primarily on K-12 education, has also shaped teacher preparation programs. Paying attention to the dynamics involved in such context that his article introduces the articles of EPAA/AAPE’s Special Issue on Preparing Teachers: Highly Qualified to Do What

New models for PIXE simulation with Geant4

Particle induced X-ray emission (PIXE) is a physical effect that is not yet adequately modelled in Geant4. The current status as in Geant4 9.2 release is reviewed and new developments are described. The capabilities of the software prototype are illustrated in application to the shielding of the X-ray detectors of the eROSITA telescope on the upcoming Spectrum-X-Gamma space mission.Comment: To be published in the Proceedings of the CHEP (Computing in High Energy Physics) 2009 conferenc

R&D on co-working transport schemes in Geant4

A research and development (R&D) project related to the extension of the Geant4 toolkit has been recently launched to address fundamental methods in radiation transport simulation. The project focuses on simulation at different scales in the same experimental environment; this problem requires new methods across the current boundaries of condensed-random-walk and discrete transport schemes. The new developments have been motivated by experimental requirements in various domains, including nanodosimetry, astronomy and detector developments for high energy physics applications.Comment: To be published in the Proceedings of the CHEP (Computing in High Energy Physics) 2009 conferenc

Kinetics of Grain Size Reduction in Minerals Undergoing Ball Milling

This work focuses on the grain size reduction induced by ball milling in individual minerals and binary mixtures containing quartz and a softer mineral. All the investigated minerals and mineral mixtures undergo a significant monotonic grain size decrease upon mechanical processing. The rate at which the process occurs in individual minerals decreases with the hardness of the mineral phase. Hardness is shown to play a crucial role also in the case of mineral mixtures. The final grain size attainable by the softer mineral as well as the rate of the grain size reduction process depend, indeed, on the amount of quartz in the mixture. A kinetic model allows rationalizing the observed behaviour based on the intensity of mechanical stresses generated during individual impacts