Analysis of glass fragments by laser ablation-inductively coupled plasma-mass spectrometry and principal component analysis

Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is used to differentiate glass samples with similar optical and physical properties based on trace elemental composition. Laser ablation increases the number of elements that can be used for differentiation by eliminating problems commonly associated with dissolution and contamination. In this study, standard residential window and tempered glass samples that could not be differentiated by refractive index or density were successfully differentiated by LA-ICP-MS. The primary analysis approach used is Principal Component Analysis (PCA) of the complete mass spectrum. PCA, a multivariate analysis technique, provides rapid analysis of samples without time-consuming pair-wise comparison of calibrated analyses or prior knowledge of the elements present in the samples. Probabilities for positive association of the individual samples are derived from PCA. Utilization of the Q-statistic with PCA allowed us to distinguish all samples within the set to a certainty greater than the 99% confidence interval.     

Issue Attitudes and Survey Continuity across Interview Mode in the 2000 NES

Nathan J. Kelly Department of Political Science, University at Buffalo, The State University of New York, Buffalo, NY 14260-4120 e-mail: nkelly{at}buffalo.edu H. Whitt Kilburn Department of Political Science, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3265 e-mail: wkilburn{at}email.unc.edu Can researchers draw consistent inferences about the U.S. public'sissue attitudes when studying survey results from both the in-personand telephone interview modes of the 2000 National ElectionStudies (NES) survey? We address this question through an analysiscontrasting the distribution of issue attitudes across modesin the dual sample design of the 2000 NES. We find clear differencesacross mode even when applying a method devised by the NES toimprove comparability by recoding issue attitude scales fromthe in-person mode. We present an alternative method of recodingthese scales, which substantially improves comparability betweenmodes. Through an analysis of the covariance structure of theissues and simple models of vote choice, we discuss the implicationsof the results for the study of issue attitudes in the 2000NES.     

Designing Efficient Institutions for Science-Based Entrepreneurship: Lesson from the US and Sweden

The recent scientification of commercial technology has brought the interface between universities and industry into sharp focus. In particular, academic entrepreneurship, i.e., the variety of ways in which academics take direct part in the commercialization of research, is widely discussed. The purpose of this paper is to suggest a framework for identifying the strategic individual decisions involved when educational choice is translated into science-based entrepreneurship. Identifying these decisions also allows us to hypothesize what incentive structures should be crucial. Our suggested framework is informally tested by an in-depth examination of the experiences of Sweden and the US. Despite large levels of R&D spending and comprehensive government support schemes, science-based entrepreneurship has been far less important in Sweden compared to the US. Our analysis points to weaknesses in the Swedish incentive structure in key respects: the rate of return to human capital investment, incentives to become an entrepreneur and to expand existing businesses, and insufficient incentives within the university system to adjust curricula and research budgets to outside demand. Several policy measures during the 1990s have reduced the weaknesses in the Swedish incentive structure. The current emergence of a more vibrant entrepreneurial culture in Sweden in some areas is consistent with these changes. Our analysis suggests that a policy aimed at encouraging science-based entrepreneurship should focus on strengthening individual incentives for human capital investment and entrepreneurial behavior both within universities and in business.     

Can the two new aid-growth models be replicated?

Recent aid effectiveness literature centers on two competing models from the family of conditional models: The Good Policy Model, where the key feature is policy times aid, and the Medicine Model, where it is aid squared. Both models were reached on a sample of 1/3 of the available data. The models are simplified to be replicatable on more of the data. Within-sample the Good Policy Model proves fragile, while the Medicine Model is more robust. Both models fail in out-of-sample replications. A semi-parametric technique is used to test for an unknown functional form of the aid-growth term. It rejects that aid is statistically significant.     

Electoral Competition and Agricultural Support in OECD Countries

Agricultural trade protectionism in developed countries remains a politically charged issue, yet few studies have attempted to explain the political dynamics behind this important trade issue. We consider agricultural subsidies as a type of distributive policy that targets the agricultural sector at the expense of consumers and taxpayers. Based on Cox (1987, 1990) and Myerson (1993) , we argue that electoral systems that encourage politicians to appeal to a narrow constituency tend to have a higher level of agricultural support. We test this theoretical hypothesis using OECD agricultural support data disaggregated by commodity and country. A cross-classified multilevel model is employed to account for complex variation of agricultural support across countries, commodities, and time. Our empirical results show that electoral systems that encourage politicians to target narrow (broad) constituencies are associated with relatively high (low) levels of agricultural subsidies.     

Protesting a perceived injustice: Sex discrimination and the restoration of equity

In this paper we propose a theoretical model that examines the relationship between resources and significant others in people's attempts to restore equity. Viewing the restoration of equity as a complex process, we integrate resource mobilization and equity arguments in order to better understand how people come to dispute and settle fair terms of exchange in allocative relationships. With individual-level data, we examine sex discrimination complaints and show that protest reactions against a perceived injustice are influenced by the level of resources a person controls. We find that the more resources a person controls, the better able she or he is in managing the protest and negotiation for equity. Further, resources also protect complainants from reprisals by the source of the inequity. These findings provide insight into the process by which people attempt to restore equity, and they suggest that the examination of real-life inequitable relations enhances our understanding of reactions to inequity.     

Beyond effects: Adolescents as active media users

This is an overview of the special Issue, Adolescents Uses of Media. The articles in the special issue are described as taking the uses and gratifications approach, which emphasizes that people make choices about the media they consume and that people differ in their interpretations of media content. The common goal of the articles is to integrate this approach with developmental perspectives on adolescence. Common themes include adolescents as active media users, the developmental context of adolescence, the cultural context of media use, and integrative and innovative methodological approaches.Received Ph.D. from University of Virginia. Research interests include adolescent reckless behavior, adolescents' uses of media, and the transition to adulthood.Received Ph.D. from University of Chicago.     

Small group insurance reform: how are state programs measuring up?

In the past decade, states have responded to the health insurance needs of small businesses by launching a number of reforms. According to authors Michael Morrisey and Gail Jensen, more than 30 states have implemented "bare-bones" policies that seek to make minimum-benefit, affordable coverage available to small employers. Almost all states have enacted legislation modifying the underwriting practices that insurers may use with respect to such things as pre-existing conditions and occupational exclusions. Other states have provided tax or employer subsidies. But despite the efforts of the states, the authors found the state policies have had little success. Drawing from a survey found that the few employers who were aware of the programs found them to be unappealing. In discovering what doesn't work, the authors are able to suggest remedies for the states' small group insurance ills, such as offering long-term instead of short-term subsidies.     

Centering Minoritized Students in Campus Interpersonal Violence Research

Journal of Family Violence - Campus interpersonal violence - defined as sexual assault, sexual harassment, intimate partner violence, and stalking - is a social problem that has received widespread...