Resolving Reflection and Resolution in 3D Imaging of Fresh Bone

Structured light scanning is a noninvasive, accurate, and cost-effective 3D imaging technique, but due to reflection issues is yet to be utilized for tool mark analysis on fresh bone. During imaging, reflection from shiny surfaces, such as greasy bone, disrupts image formation. This study tested the David SLS-1 scanner's ability to image saw marks and explored six strategies to reduce reflection by [1] dulling the surface or [2] altering the projected light. The surface was dulled by freezing, talcum powder, dulling spray, or compressed air. The projected light was altered with a diffuser or limited to single pattern-coded. Results demonstrated that the resolution was insufficient for capturing minute details of striae. All six tests failed to reduce reflection sufficiently to produce complete images, but projecting vertical pattern-coded light showed the most promise. Future research is required concentrating on enhancing resolution and exploring the role of pattern-coded light in reducing reflection.     

Intergenerational Cultural Dissonance,Parent–Child Conflict and Bonding,and Youth Problem Behaviors among Vietnamese and Cambodian Immigrant Families

Intergenerational cultural dissonance (ICD)—a clash between parents and children over cultural values—is a frequent issue for Asian American youth. Using longitudinal data from the Cross Cultural Families Project, this study examines the mechanisms by which ICD contributes to problem behaviors, including whether ICD predicts parent–child conflict, whether parent–child conflict then has a direct effect on youth problem behavior, and whether positive bonding with parents mediates the effects of such conflict on youth problem behaviors among Vietnamese (n = 164) and Cambodian (n = 163) families with adolescents [average age = 15.2 years (SD = 1.05)]. The results from the path analyses show that, in both groups, ICD indirectly predicts problem behaviors by increasing parent–child conflict, which in turn weakens positive parent–child bonding. Interventions that target youths’ perception of intergenerational cultural gaps, help them manage conflict, and help strengthen bonds with parents may prevent problem behaviors among Cambodian and Vietnamese families. This study contributes to inform how to effectively prevent problems and difficulties among these families.

Bullet Caliber and Type Categorization from Gunshot Wounds in Sus Scrofa (Linnaeus) Long Bone

Studies on ballistic trauma to the ribs and thorax, cranium, and long bones demonstrate the potential of obtaining a bullet caliber from an entrance wound. In order to validate prior research on caliber estimation in bone tissue and assess the viability of bullet type determination based on the macroscopic evidence at the entrance wound, thirty fleshed pork (Sus scrofa) shoulders (humeri) were shot with either lead or copper jacketed bullets in one of three calibers; 0.22, 9 mm, or 0.38. Overall, our findings are consistent with previous research indicating that calibers can be grouped into “small” and “large” categories. Bullet type, lead or copper jacket, can be ascertained based on cortical flaking and the analysis of materials deposited around the entry wound. The addition of this evidence holds value in cases where no firearm or ballistic evidence is recovered from a crime scene.     

Interpreting the Effects of Burning on Pre-incineration Saw Marks in Bone

This study examined the effects of fire on the features associated with saw marks in bone. Both class and individual characteristics were examined using stereomicroscopy and scanning electron microscopy (SEM). Twenty-four semifleshed Sus scrofa L. tibiae were sawed into three sections with the middle section having deep and shallow false starts. Twelve saw blades of varying age and type were each used to cut two tibiae. In each case, the first tibia was burned in an outdoor open fire to the point of partial calcination. The second tibia, our control, was macerated using a heated enzyme solution. Controls and burned specimens were examined for the following characteristics: breakaway spur, tooth hop, false start, exit chipping, tooth imprint, breakaway notch, pull out striae, kerf flare, and blade drift. In general, there was parity in the observed characteristics in the burned samples using the SEM and the stereomicroscope. SEM observation, however, provided enhanced images, with the addition of observing individual tooth imprints, previously not visible. Therefore, this study recommends using an SEM for the examination of saw cuts in burnt bone.     

Dimensions of interparental conflict and adolescent functioning

While research has repeatedly demonstrated that interparental conflict is related to poorer child/adolescent functioning in the areas of internalizing and externalizing problems, as well as prosocial and cognitive competence, the particular relevant dimensions of the conflict have yet to be studied. The present study examined the contributions of three different dimensions of conflict to these difficulties in adolescent functioning. Forty-eight mother-father-adolescent triads participated by completing questionnaires regarding the following dimensions of their interparental conflict: frequency, method of handling, and outcome. Assessment of adolescent functioning was obtained independently through teacher-completed measures of internalizing and externalizing problems and prosocial and cognitive functioning. The results of correlational analyses indicated that father-completed measures, particularly the use of verbal and physical aggression to handle conflict, were related to all four measures of adolescent functioning. In contrast, mother-completed measures were not related. Multiple regression analyses were also conducted. For all four measures, either father physical or father verbal aggression entered first and accounted for 17 to 48% of the variance across the four dependent measures. No other indices of conflict individually accounted for a significant portion of the variance beyond that accounted for by father's verbal or physical aggression. Possible explanations for the relationship between father's method of handling of conflict and adolescent functioning are discussed.     

A measure of skewness in offense distributions

It has become a criminological fact of life that a small group of offenders is responsible for a far greater share of offending than its size would suggest. For example, it is well known that in the 1945 Philadelphia birth cohort, 6% of the cohort members committed 52% of the offenses. We argue, however, that the conventional percentaging approach to measuring skewness in offense distributions is inadequate. We propose and apply an alternative approach to measuring offense skewness which utilizes the offense distribution to its fullest and can easily and meaningfully be used for comparisons across or within study populations.