Rural Community Responses to a National Mandate: An Assessment of Floodplain Land-Use Management

Rural governments face a difficult task in complying with theNational Flood Insurance Program (NFIP), which requires detailedplanning, land use ordinances, and effective enforcement provisionsto reduce flood losses. This study analyzes responses from anational sample of officials in 852 nonmetropolitan NFIP communitiesand flood management officials in all fifty state governments.Rural officials perceive their overall floodplain managementprograms to be relatively effective in protecting future developmentbut less effective in protecting existing structures. Whileflood hazard mitigation is not a high priority in rural government,the national program appears to have spurred local activity.State assistance in developing local regulations and providinginformation is correlated with rural officials' perceptionsof meeting NFIP goals. Programs rated most effective are incommunities with local regulations in force, although technicalproblems and local political opposition are widely acknowledgedas obstacles to the development of land use measures.     

Testing Gottfredson and Hirschi’s “low self-control” stability hypothesis: An exploratory study

In Gottfredson and Hirschi’s (1990)A General Theory of Crime, criminal and analogous behaviors are argued to be the result of a stable individual psychological trait referred to as “low self-control.” In this article, we test the proposition that low self-control is a stable characteristic. We conduct a two-wave panel study that measures the self-reported self-control of college students at two relatively close time points. Our test of the stability hypothesis includes conducting four separate analyses of the data (t-tests, correlations, individual change scores, and HLM analyses). In general, we find that most of the dimensions of self-control, and the overall self-control construct, appear to be relatively stable across this short period of time. However, given that the measurements were taken closely together and that we do not find correlations as strong as might be expected, at points the strength of the stability is somewhat unclear. Paper presented at the annual meeting of the American Society of Criminology, Chicago, November 1996.     

Antitrust actions and the budgeting process

The author expresses appreciation to Dan Benjamin, Charles Knoeber, C.M. Lindsay, M.T. Maloney, William Shughart II, and John Warner for comments and criticisms. The usual caveat applies.     

Analysis of artificial radiocarbon in different skeletal and dental tissue types to evaluate date of death

Radiocarbon dating, with special reference to the modern bomb-curve, can provide useful information to elucidate the date of death of skeletonized human remains. Interpretation can be enhanced with analysis of different types of tissues within a single skeleton because of the known variability of formation times and remodeling rates. Analysis of radiocarbon content of teeth, especially the enamel in tooth crowns, provides information about the date of formation in the childhood years and in consideration of the known timing of tooth formation can be used to estimate the birth date after 1950 ad. Radiocarbon analysis of modern cortical and trabecular bone samples from the same skeleton may allow proper placement on the pre-1963 or post-1963 sides of the bomb-curve as most trabecular bone generally undergoes more rapid remodeling than does most cortical bone. Pre-1963 bone formation would produce higher radiocarbon values for most trabecular bone than for most cortical bone. This relationship is reversed for formation after 1963. Radiocarbon analysis was conducted in this study on dental, cortical, and trabecular bone samples from two adult individuals of known birth (1925 and 1926) and death dates (1995 and 1959). As expected, the dental results correspond to prebomb-curve values reflecting conditions during the childhoods of the individuals. The radiocarbon content of most bone samples reflected the higher modern bomb-curve values. Within the bone sample analyses, the values of the trabecular bone were higher than those of cortical bone and supported the known placement on the pre-1963 side of the bomb-curve.     

A comparison of animal jaws and bite mark patterns

The purpose of this study was to compare the jaw shapes and bite mark patterns of wild and domestic animals to assist investigators in their analysis of animal bite marks. The analyses were made on 12 species in the Order Carnivora housed in the Mammalian Collection at the Field Museum of Natural History in Chicago, Illinois. In addition to metric analysis, one skull from each species was photographed as a representative sample with an ABFO No. 2 scale in place. Bite patterns of the maxillary and mandibular dentition were documented using foamed polystyrene exemplars, which were also photographed. A total of 486 specimens were examined to analyze the jaw and bite mark patterns. A modified technique for measuring intercanine distances was developed to more accurately reflect the characteristics seen in animal bite marks. In it, three separate areas were measured on the canines, rather than just the cusp tip. This was to maximize the amount of information acquired from each skull, specifically to accommodate variances in the depth of bite injuries.     

Genetic structure among 38 populations from the United States based on 11 U.S. core Y chromosome STRs

A DNA database consisting of the 11 Y chromosome short-tandem-repeat (Y-STR) recommended by the Scientific Working Group on DNA Analysis Methods is constructed for 2517 individuals from 38 populations in the United States. The population samples derive from five ethnic groups currently living in 10 states. A multidimensional scaling (MDS) plot places the populations into four discrete clusters (African Americans (AA), European Americans (EA), Hispanic Americans (HA), and Asian Americans (SA)) and one dispersed cluster of Native Americans. An analysis of molecular variance (AMOVA) indicates that a large proportion of the total genetic variance is partitioned among ethnic groups (24.8%), whereas only a small amount (1.5%) is found among-populations within ethnic groups. Separate AMOVA analyses within each ethnic group show that only the NA sample contains statistically significant among-population variation. Pair wise population differentiation tests do uncover heterogeneity among EA and among HA populations; however, this is due to only a single sample within each group. The analyses support the creation of AA, EA, HA, and Asian American databases in which samples from different geographic regions within the United States are pooled. We recommend that separate databases be constructed for different NA groups.     

Fast gas chromatography of explosive compounds using a pulsed-discharge electron capture detector

The detection of a mixture of nine explosive compounds, including nitrate esters, nitroaromatics, and a nitramine in less than 140 sec is described. The new method employs a commercially available pulsed-discharge electron capture detector (PDECD) coupled with a microbore capillary gas chromatography (GC) column in a standard GC oven to achieve on-column detection limits between 5 and 72 fg for the nine explosives studied. The PDECD has the benefit that it uses a pulsed plasma to generate the standing electron current instead of a radioactive source. The fast separation time limits on-column degradation of the thermally labile compounds and decreases the peak widths, which results in larger peak intensities and a concomitant improvement in detection limits. The combination of short analysis time and low detection limits make this method a potential candidate for screening large numbers of samples that have been prepared using techniques such as liquid-liquid extraction or solid-phase microextraction.