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Integrated schools may still be substantively segregated if friend-ships fall within race. Drawing on contact theory, this study tests whether school organization affects friendship segregation in a national sample of adolescent friendship networks. The results show that friendship segregation peaks in moderately heterogeneous schools but declines at the(More)
for their comments, even if we did not find space to incorporate them and there remains much about the paper with which they may disagree. We also thank the two Annals Editors, Art Brief and Jim Walsh, for their support and suggestions. ABSTRACT Critical management studies (CMS) offers a range of alternatives to mainstream management theory with a view to(More)
Organic modification of clays with surfactants is required for the preparation of polymer-clay nanocomposites for a variety of applications. We have studied the structure and dynamics of interfaces in synthetic clays modified with phosphonium surfactants. The chemical shifts, line widths, and relaxation times measured by 31P, 13C, and 1H NMR and the(More)
Poorly maintained sidewalks, missing curb ramps, and other obstacles pose considerable accessibility challenges. Although pedestrian-and bicycle-oriented maps and associated routing algorithms continue to improve, there has been a lack of work focusing on accessibility. There is currently no way for a user to determine accessible areas of a city prior to(More)
As the web becomes the application platform of choice, supporting complex authorization policies is becoming increasingly difficult. This paper discusses the security challenges that web applications must face. It then proposes an authorization framework to help address those challenges. It provides some examples of how various policies can be implemented(More)
United States-based companies continue to dominate the global market in packaged software. Although many have predicted this U.S. dominance will wane, particularly as a result of competitive threats from Japan, and more recently from low-wage, developing nations, erosion has yet to be significant. The United States benefits from nine factors that sustain(More)
BACKGROUND People in modern societies spend more than 90% of their time indoors. Hence, indoor environmental quality (IEQ) has a significant impact on public health. In this article we describe health risks associated with indoor environments, illuminate barriers to overcoming these risks, and provide policy recommendations to achieve healthier indoor(More)
DISCLAIMER The views, opinions and/or findings contained in this report are those of The MITRE Corporation and should not be construed as an official Government position, policy, or decision, unless designated by other documentation. This report documents the results of a short email-mediated study by The MITRE Corporation on the use of free and open-source(More)
Face recognition is a challenging problem, complicated by variations in pose, expression, lighting, and the passage of time. Significant work has been done to solve each of these problems separately. We consider the problems of lighting and expression variation together, proposing a method that accounts for both variabilities within a single model. We(More)