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31.
This paper investigates the effectiveness of New Jersey's mandatory belt use law (MUL) by testing specifically for: (1) a safety effect, and (2) a risk-compensation effect that could offset (in part) any safety impact. The main findings are that injury severity declined significantly in the 22 months following implementation of the MUL; but that accident frequency increased significantly. The increase in accidents may be explained only partially by increased driving mileage. These findings suggest that the real safety effect of the law may have been diluted by risk-compensating behavior.This paper is based on a study conducted for the New Jersey Office of Highway Traffic Safety by the Rutgers University Bureau of Economic Research. We are grateful to William Ascher and two referees for useful comments. 相似文献
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Dennis A. Rondinelli 《公共行政管理与发展》1991,11(5):415-430
This article examines the problem of extending access to potable water through conventionally controlled government services and describes the roles of non-governmental organizations and community management associations in improving service delivery and maintaining local water systems. Six sets of factors that are crucial to the success of community management are identified: adequate incentives, sufficient skills and resources, appropriate processes for water systems operations and maintenance, effective interorganizational relationships, appropriate technology, and effective systems of monitoring, evaluation and feedback. The components that must be taken into consideration in designing and implementing programmes for decentralizing water supply systems through community management are set out. 相似文献
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The literature on incumbency advantage has focused on margin as an indicator for electoral security. But while electoral margin is a goodex ante measure, it is a poorex post measure of security. Further, existing work has not integrated the choice of retirement with changes in the level of security. To improve the specification and definition of “marginality”, a multinomial LOGIT model is proposed where the dependent variable is categorical. Account is therefore taken of all the ways a Representative's term in office can end, including reelection, defeat, retirement, or pursuit of other office. The sample includes all U.S. Representatives elected for the first time between 1948 and 1978. The results indicate that (1) margin in the previous election is a significantex ante proxy for the probability of electoral defeat, and (2) while the electoral safety of all incumbents in the House has been increased, the increases are greater for members elected for the first time in the period since 1965. 相似文献
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This research attempted to more adequately dimensionalize the study of affective family relations during adolescent pubertal maturation by employing a multivariate approach. Fifty-one families responded to an assessment battery consisting of a series of questionnaires designed to measure affective relations between parents and their adolescent children. Families were classified into prepubertal, transpubertal, or postpubertal groups according to their modal response on pubertal status criteria. A stepwise discriminant analysis was performed to identify measures that maximize between groups differences. Based on this analysis, a correct classification rate of 70% was achieved for all families. The two significant discriminant functions that emerged indicate that differences in family relationships are due to the transformation of mother-adolescent and father-adolescent relations. The pattern of results replicate those of other researchers and provide elaborations concerning the affective nature of family relations during adolescence.Received his Ph.D. in Life-span Developmental Psychology from West Virginia University in 1984. Research interests in dialectical models of adolescent development.Received his Ph.D. from the University of Arkansas in 1979. Research interests in decision-making in adolescence and adulthood. 相似文献
36.
Student teachers were asked to respond to profiles of various styles of dealing with adolescent identity issues. Student teachers responded most favorably to the profile indicating adolescent exploration of occupational and ideological alternatives (Moratorium) and least favorably to an apparent nonconcern with adolescent issues (Diffuse). Commitment to plans and beliefs with closedness to alternatives (Foreclosure) received intermediate evaluations. Consistent with Eriksonian notions, but at variance with empirical findings, the Moratorium style was rated highest in psychological health. Student teachers preferred the Moratorium-style individual as prospective students; the Diffuse-style one the least. Implications for teacher training and educational practice were examined, and areas of further research were outlined.Funding for this project was received from a grant by the Faculty of Education, University of Western Ontario, London, Ontario, Canada.He received his Ph.D. in Educational Psychology from the Ontario Institute for Studies in Education, University of Toronto. Research interests include adolescent personality development and teacher training.His Ph.D. was received from the University of Oklahoma in Experimental Social Psychology. Current research interests include varied aspects of consumer behavior with focus upon the effects of credit card stimuli upon consumer behavior.He received his Ph.D. in Educational Psychology from the Ontario Institute for Studies in Education, University of Toronto. Research interests focus upon special education and learning disabilities. 相似文献
37.
Jack Dennis 《Political Behavior》1987,9(4):323-372
This essay asks what might be most usefully studied in future analyses of the impact of groups on the voting behavior of individuals. A dimension of group analysis so far neglected concerns some value orientations that affect the relevance of group consciousness to voting or other political behavior. In particular, the legitimacy of group political action and of group politics more generally is of central importance. Connected to such evaluations is the character of group comparisons, such as in group-focused relative power deprivation. Also of relevance are competing political value constellations, especially individualism and majoritarianism. By the use of a variety of National Election Studies and Wisconsin survey data, these themes are explored empirically to show the extent of a group focus that goes beyond the usual measures of group consciousness. Relative approval of group-based pluralism is also shown to affect the patterns of relationships of major predictors of turnout. And finally, a LISREL analysis is presented that shows that a group focus is as important as a party focus in affecting the level of political alienation pertinent to voter participation. 相似文献
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With increasing frequency, relatively small, fragmentary evidence thought to be osseous or dental tissue of human origin is submitted to the forensic laboratory for DNA analysis with the request for positive identification. Prior to performing DNA analysis, however, it is prudent to first perform a presumptive test or "screen" to determine whether the questioned material may be eliminated from further consideration. When material is shown not to be consistent with bone/teeth, DNA testing is not performed. When such determinations cannot be made from gross morphological features, elemental analysis can be indicative. This presumptive test is made possible by applying scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) in conjunction with an X-ray spectral database recently developed by the FBI laboratory. This database includes spectra for many different materials including known examples of bone and tooth from many different contexts and representing the full range of taphonomic conditions. Results of SEM/EDS analysis of evidence can be compared to these standards to determine if they are consistent with bone and/or tooth and, if not, then what the material might represent. Analysis suggests that although the proportions and amounts of calcium and phosphorus are particularly important in differentiating bone and tooth from other materials, other minor differences in spectral profile can also provide significant discrimination. Analysis enables bone and tooth to be successfully distinguished from other materials in most cases. Exceptions appear to be ivory, mineral apatite, and perhaps some types of corals. 相似文献