Student removal became an increasingly utilized form of discipline since the implementation of zero-tolerance policies during the early 1990s. Evaluative studies have consistently found negative relationships between student removal and academic success. Majority of cases regarding student removal are for minor and non-violent offenses and literature in this field suggests that teachers’ biases and cultural misreadings widen racial disparities in school discipline and academic performance. Our study estimates the effects of suspensions, school-related arrests, and expulsions under zero-tolerance by exploiting within-school variation in school mean proficiency rates of Asian, Hispanic, Black, and White racial subgroups over a 3-year period. Our findings reaffirm consistent evidence that exclusionary policies have negative effects on academic outcomes. We also find evidence of differential effects by racial subgroup. The paper concludes with a discussion and policy implications.

No abstract

<p>This study uses panel data (2011-12, 2013-14, 2015-16) from three sources—the US Department of Education Office for Civil Rights (OCR), the National Center for Education Statistics’ Common Core Data (CCD), and the Ohio Department of Education (ODE) school report cards. These data were then merged using a common key to create one large dataset. OCR and CCD data have a common school identification key that was readily available. Data from ODE contained Building and District identification numbers that were concatenated to create a school ID that was identical to the one in the other two datasets.</p>

No abstract

This study investigates the autoignition of Primary Reference Fuels (PRFs) using a detailed kinetic model. The chemical kinetics software CHEMKIN is used to facilitate solutions in a constant volume reactor and a variable volume reactor, with the latter representing an IC engine. Experimental shock tube and HCCI engine data from literature is compared with the present predictions in these two reactors. The model is then used to conduct a parametric study in the constant volume reactor of the effect of inlet pressure, inlet temperature, octane number, fuel/air equivalence ratio, and exhaust gas recirculation (EGR) on the autoignition of PRF/air mixtures. A number of interesting characteristics are demonstrated in the parametric study. In particular, it is observed that PRFs can exhibit single or two stage ignition depending on the inlet temperature. The total ignition delay, whether single or two stage, is correlated with n-C 7 H 16 /O 2 ratio. Thermodynamic and chemical effects are identified for the EGR constituents CO 2 , H 2 O, and N 2. The former effect is due to the difference in specific heats and is well known. Introduction of each diluent reduces the mole fraction of O 2 which has the chemical effect of delaying ignition. In addition, H 2 O as a diluent is shown to directly affect key species and reactions involved in high temperature kinetics, resulting in the enhancement of the ignition process relative to N 2. The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.