Design Synthesis of Adaptive Mesoscopic Cellular Structures with Unit Truss Approach and Particle Swarm Optimization Algorithm

Cellular material structures have been engineered at the mesoscopic scale for high performance and multifunctional capabilities. However, the design of adaptive cellular structures - structures with cellular configurations, sizes, and shapes designed for a specific geometric and loading context - has not been sufficiently investigated. In this paper, the authors present a design synthesis method with the use of unit truss approach and particle swarm optimization algorithm to design adaptive cellular structures. A critical review is presented to show the pros and cons of the new design synthesis method and an existing homogenization method. The research extends the application of additive manufacturing in the design of new materials for high performances and benefits its long-term growth.Mechanical Engineerin

Measuring Risk Attitudes Controlling for Personality Traits

This study measures risk attitudes using two paid experiments: the Holt and Laury (2002) procedure and a variation of the game show Deal or No Deal. The participants also completed a series of personality questionnaires developed in the psychology literature including the risk domains of Weber, Blais, and Betz (2002). As in previous studies risk attitudes vary within subjects across elicitation methods. However, this variation can be explained by individual personality traits. Specifically, subjects behave as though the Holt and Laury task is an investment decision while the Deal or No Deal task is a gambling decision.Risk Attitudes, Risk Taking Behavior, Personality Traits, Laboratory Experiments.

Neighbourhoods of Phylogenetic Trees: Exact and Asymptotic Counts

A central theme in phylogenetics is the reconstruction and analysis of evolutionary trees from a given set of data. To determine the optimal search methods for the reconstruction of trees, it is crucial to understand the size and structure of neighbourhoods of trees under tree rearrangement operations. The diameter and size of the immediate neighbourhood of a tree has been well-studied, however little is known about the number of trees at distance two, three or (more generally) k from a given tree. In this thesis we explore previous results on the size of these neighbourhoods under common tree rearrangement operations (NNI, SPR and TBR). We obtain new results concerning the number of trees at distance k from a given tree under the Robinson-Foulds (RF) metric and the Nearest Neighbour Interchange (NNI) operation, and the number of trees at distance two from a given tree under the Subtree Prune and Regraft (SPR) operation. We also obtain an exact count for the number of pairs of binary phylogenetic trees that share a first RF or NNI neighbour

Perceptions of Safety and Support among High School Football Players Utilizing a Helmet Impact Detection System

Background: Concussions are common in high school football athletes and can have short and long-term health impacts. New football helmets furnished with accelerometers to detect rate and location of impact have recently emerged. The use of these helmets offers the ability to rapidly and objectively assess concussions on the sideline. However, minimal research has explored athlete’s perceptions of the use of these helmets. Purpose: The purpose of this study was to determine high school football players’ perceptions of safety and support following a season of use of a Helmet Impact Detection System. Methods: 118 high school football players from a large parochial school completed an electronic 29-item cross-sectional survey to obtain demographic information and safety perceptions at the end of a football season. Participants wore Riddell InSite Helmets (Riddell, Inc. Elyria, OH) the entire football season prior to the survey. Descriptive statistics were computed utilizing SPSS software. Results: When asked to rate the degree to which players felt the concussion helmets helped keep them safe, 69.1% of students strongly agreed and 23.6% somewhat agreed. When asked if they agreed or disagreed that they felt safer than opposing teams that did not wear the helmets only 47.3% of players strongly agreed. When asked if they played harder or more confidently due to the helmets 57.3% of players strongly agreed. Finally, 17.3% of players somewhat or strongly agreed that they would not play football if it were not for the helmets. Conclusion: These findings suggest the use of instrumented helmets may encourage athletes’ feeling supported by coaches/administrators and their perceptions of safety which could impact their decision to engage in football. However, more research is needed to determine if these feelings of safety translate to a change in rates of concussions compared to players with traditional helmets

Harman and Lorandos’ False Critique of Meier et al.’s Family Court Study

Jennifer Harman and Demosthenes Lorandos purport to have identified numerous methodological flaws in our 2019 study of family court outcomes in cases involving abuse and alienation allegations (“FCO study”; Meier et al., 2019). At least half of the supposed flaws they itemized relate to one claim - that they were unable to access our methods and data. They treat the claimed lack of public access as evidence that our study is unreliable, while speculating about other potential flaws. Yet we note - and they acknowledge - that most of the methodological information they sought was in fact available before publication of their article. This article responds to and refutes Harman and Lorandos’ exaggerated and unfounded condemnation of our study. In addition to pointing out that the claimed lack of information would not be a methodological flaw even if true, we explain that their other criticisms are speculative, incorrect, or insignificant. We appreciate this opportunity to clarify that the important findings of the FCO study are valid and should be taken seriously by the courts and those interested in the fairness and safety of custody decisions when there are allegations of abuse and alienation

Child Custody Outcomes in Cases Involving Parental Alienation and Abuse Allegations

Arguably the most troubling aspect of justice system response to intimate partner violence is custody courts\u27 failure to protect children when mothers allege the father is abusive. Family courts\u27 errors in assessing adult and child abuse, and punitive responses to abuse allegations, have been widely documented. A significant contributor to these errors is the pseudo-scientific theory of parental alienation (PA). Originally termed parental alienation syndrome (PAS), the theory suggests that when mothers allege that a child is not safe with the father, they are doing so illegitimately, to alienate the child from the father. PA labeling often results in dismissal of women\u27s and children\u27s reports of abuse, and sometimes trumps even expert child abuse evaluations. PAS was explicitly based on negative stereotypes of mothers and has been widely discredited. The term parental alienation – while treated as distinct - is still widely used in ways that are virtually identical to PAS. Nonetheless, because PA is nominally gender neutral (and not called a scientific syndrome), it continues to have substantial credibility in court. The first goal of this project was to ascertain whether empirical evidence indicates that parental alienation is, like PAS, gender-biased in practice and outcome. Second, the study sought to explore outcomes in custody/abuse litigation by gender and by differing types of abuse. Analysis of over 2000 court opinions confirms that courts are skeptical of mothers’ claims of abuse by fathers; this skepticism is greatest when mothers claim child abuse. The findings also confirm that fathers’ cross-claims of parental alienation increase (virtually doubling) courts’ rejection of mothers’ abuse claims, and mothers’ losses of custody to the father accused of abuse. In comparing court responses when fathers accuse mothers of abuse, a significant gender difference is identified. Finally, the findings indicate that where Guardians Ad Litem or custody evaluators are appointed, unfavorable outcomes for mothers and gender differences are increased. The study relies solely on electronically available published opinions in child custody cases. It has produced an invaluable database identifying 10 years of published cases involving alienation, abuse and custody, while coding parties’ claims and defenses, outcomes, and other key factors by gender and parental status

The trouble with Harman and Lorandos’s attempted refutation of the Meier et al. Family court study

Harman and Lorandos assert that they have produced a study analyzing custody cases involving alienation allegations, which “disconfirms” the findings from our study of family court out- comes in cases involving abuse and alienation. In addition to pointing out the authors’ misrepresentation and mis-reporting of some of their findings, this Response details a series of profound flaws in their study’s design, dataset construction and variable coding, interpretations and analytic approach, as well as a series of statistical errors. The statistical analyses demonstrate that Harman and Lorandos’s five findings of a gender bias in favor of fathers are not supported by their data; the only statistically significant findings that persist after re-analysis of the correct data are consistent with the Meier et al. study. These pervasive design and methodological errors undermine both the appearance and assertion of rigor in their approach; these problems and the foundational differences in their dataset from our own disqualify their study from serving as any kind of credible test or disconfirmation of our study