The dynamics of injuries caused by thrown, razor-sharp shurikens

In 10 tests, the linear velocity and rotation frequency of a thrown, pointed, razor-sharp shuriken were investigated using a high-speed camera. The linear velocity (5.1-9.87 m/s) and rotation frequency (0-4.46 m/s) determine the impact (0.91-3.6 nm) of this Asiatic weapon. An impact of 3.6 Nm is sufficient to cause a penetration depth of more than 3.5 cm within the regio ossis temporalis, the regio collis lateralis and the regio intercostalis. Legally, the use of this new generation of pointed, razor-sharp shurikens should be prohibited as "sports" apparatus.     

The Neglected Strata: States in the City-Federal Politics of Malaysia

Another version of this paper was prepared for Conference on"The Politics of Intergovernmental Relations in Federal Systems:Urban Perspectives," Center for the Study of Federalism, TempleUniversity, Philadelphia, August 26–28, 1973. In revisingthis paper, I am indebted to Dorothy and James Guyot for theirperceptive and helpful suggestions.     

A critique of the research literature concerning pregnant adolescents, 1960–1970

A perspective on the research literature from 1960 to 1970 concerning pregnant adolescents (this literature was abstracted and reviewed in a previous publication) is presented. Research methodology and potential content for research are examined and suggestions made that would contribute to a stronger empirical base for the research. Several assumptions (of difference, of homogeneity, and of special need) regarding pregnant adolescents that seem to be implicit in the research are brought to light. Finally, an analysis of the risk concept is presented.Has degrees in social work (M.S. and Ph.D.) and public health (M.S.), with research interests in adolescent health status, human service for youth, and the process of (research) consultation.Has M.A. in sociology.Has degrees in theology (B.D.) and medical sociology (Ph.D.). He teaches the latter, while focusing his research interests on the mental health consequences on women as a result of their labor force participation and the evaluation of accelerated medical education programs.M.D. degree and a degree also in public health. Before his academic career, he was a high public official in the New York State Department of Health. His publications include studies of the medical aspects of water fluoridation and high-risk groups receiving maternity care. Current research interests include studies of patterns of provision of maternal and child health services in the United States, the incidence and prevalence of long-term diseases of childhood, and followup studies of low birth weight and other vulnerable infants.     

Teenage pregnancy and neonatal behavior: Effects in Puerto Rico and Florida

The purpose of this study was to examine the relationship between neonatal behavior and prenatal and perinatal risk factors in infants of teenage and older mothers in Puerto Rico and Mainland United States. The sample included approximately 300 newborn infants;half were examined in Puerto Rico, the other half in Florida, using the Brazelton Neonatal Behavioral Assessment Scale. Comparisons by maternal age and the number of obstetrical complications showed that for the Puerto Rican group, infants with fewer obstetrical complications were better able to regulate their crying and active states. Infants of teenage mothers with fewer complications had a higher level of arousal than infants of older mothers with fewer complications. Infant behavior in the Mainland sample did not vary by maternal age or complications. Multiple regression analysis indicated that the combination of biomedical variables significantly predicted neonatal behavior in both cultures. Mother's age was not separately correlated with neonatal behavior, but was repeatedly combined with other variables in the significant regressions. The findings suggest that infants of teenage mothers may differ from infants of older mothers, particularly in the organization of state behavior, and that the effects of maternal age on neonatal behavior are increased in the presence of biological outcome factors.This article is based on a final report to the NICHD Center for Population Research, Contract N01-HD-7283.Received Ph.D. from Michigan State University. Main research interests are determinants of neonatal and infant development, assessment of preterm and at risk infant.Received Ph.D. from Harvard University. Main research interests are sociocultural aspects of development, teenage pregnancy, infant temperament and psychophysiology.Received M.A. from University of Florida. Main research interests are prenatal and prenatal factors on development, maternal obstetric medication, and behavioral teratology.     

Informal interference in the judiciary in new democracies: a comparison of six African and Latin American cases

This article focuses on the efforts of power holders – at the executive or the legislative level – to influence or curb court activity informally or extra-legally, an acknowledged but under-researched topic in studies of judicial politics. We first define informal judicial interference and operationalize the concept; we then explain how we collected information on the topic through systematic cross-country interviewing. Our concept focuses on judicial intervention actions exercised by political actors once judges are on the bench. We distinguish these actions according to type – direct or subtle – and further differentiate each type according to six different modes. We provide new empirical data on informal interference in six third-wave democracies, three in Africa (Benin, Madagascar, and Senegal) and three in Latin America (Argentina, Chile, and Paraguay). Our empirical findings, first, confirm the importance of informal practices in shaping political-judicial relations. Second, they point to long-standing legacies and to the level of socio-economic development as possible explanations for different performances in terms of the prevalence and severity of informal interference in the judiciary in these newly established democratic regimes     

Declines in Crime and Teen Childbearing: Identifying Potential Explanations for Contemporaneous Trends

Objectives

The previous 25 years have witnessed remarkable upheavals in the social landscape of the United States. Two of the most notable trends have been dramatic declines in levels of crime as well as teen childbearing. Much remains unknown about the underlying conditions that might be driving these changes. More importantly, we do not know if the same distal factors that are responsible for the drop in crime rates are similarly implicated in falling rates of teen births. We examine four overarching potential explanations: fluctuations in economic opportunity, shifting population demographics, differences in state-level public policies, and changes in expectations regarding health and mortality.

Methods

We combine state and year-specific data from existing secondary sources to model trajectories of violent crime and teen fertility over a 20-year period from 1990 to 2010 using simultaneous fixed-effects regression models.

Results

We find that 4 of the 20 predictors examined—growth in the service sector of the labor market, increasing racial diversity especially among Hispanics, escalating levels of migration, and the expansion of family planning services to low-income women—offer the most convincing explanations for why rates of violent crime and teen births have been steadily decreasing over time. Moreover, we are able to account for almost a quarter of the joint declines in violent crime and teen births.

Conclusions

Our conclusions underscore the far reaching effects that aggregate level demographic conditions and policies are likely to have on important social trends that might, at first glance, seem unrelated. Furthermore, the effects of policy efforts designed to target outcomes in one area are likely to spill over into other domains.