Continuous internal channels formed in aluminum fusion welds

Process produces continuous internal channel systems on a repeatable basis in 2014-T6 aluminum. Standard machining forms the initial channel, which is filled with tungsten carbide powder. TIG machine fusion welding completes formation of the channel. Chem-mill techniques enlarge it to the desired size

The fictive pass asymmetry: Condemnation of harm, but not purity, is mitigated by fictional contexts

Is there a double standard when it comes to the moral acceptability of fiction that encourages the imagination of acts that violate moral norms of harm and moral norms of purity? Observations of ethics, legal proceedings, and public reactions to different types of media seems to suggest so. Over six experiments this phenomenon, coined the fictive pass asymmetry, will be tested. The fictive pass asymmetry hypothesis proposes that fictional contexts including imagination, film, and virtual environments, will mitigate the condemnation of harm code violations more so than purity code violations. In other words, fictional representations of harm are given a “fictive pass” in moral condemnation, but the fictional representation of purity code violations that involve an abnormal use of one’s body are denied a pass, and thus evaluated more similarly across real and fictional contexts. Chapters 1 through 3 introduce the fictive pass asymmetry and review the literature that provide its theoretical framework. Chapter 4 presents three experiments that establish initial evidence in support of the fictive pass asymmetry effects. Experiment 1 presented participants (N = 431) with vignettes that described agents committing either sexual acts or violent acts that were described as occurring in real life, being performed in a video game, or watched in a film. Experiments 2 and 3 (N = 360 and N = 321, respectively) systematically improved methodology by expanding upon the fictive contexts and creating manipulations based more strictly on the moral psychology literature. Chapter 5 presents experiment 4 (N = 312) and experiment 5 (N = 352) which deepened the understanding of the fictive pass asymmetry effects by using mediation analyses to demonstrate how the perceived wrongness of fictional purity code violations can be explained by the extent to which they signal poor moral character. Lastly, chapter 6 contains a final experiment (N = 484) and a series of meta-analyses. The final experiment considers fictive pass asymmetry effects in relation to an opposing theoretical framework, validates a number of manipulations, and tests the presumption of desire as an alternate explanation of fictive pass asymmetry effects. Finally, the meta-analyses aggregate the data of these experiments to highlight the robustness of the fictive pass asymmetry effects. Chapter 7, the concluding chapter, reviews the experiments and discusses the results in regards to theories of anger and disgust, moral theories of act and character, as well as the fictive pass asymmetry’s implications in media use and regulation

Numerical implementation of some reweighted path integral methods

The reweighted random series techniques provide finite-dimensional approximations to the quantum density matrix of a physical system that have fast asymptotic convergence. We study two special reweighted techniques that are based upon the Levy-Ciesielski and Wiener-Fourier series, respectively. In agreement with the theoretical predictions, we demonstrate by numerical examples that the asymptotic convergence of the two reweighted methods is cubic for smooth enough potentials. For each reweighted technique, we propose some minimalist quadrature techniques for the computation of the path averages. These quadrature techniques are designed to preserve the asymptotic convergence of the original methods.Comment: 15 pages, 10 figures, submitted to JC

Taming the rugged landscape: production, reordering, and stabilization of selected cluster inherent structures in the X_(13-n)Y_n system

We present studies of the potential energy landscape of selected binary Lennard-Jones thirteen atom clusters. The effect of adding selected impurity atoms to a homogeneous cluster is explored. We analyze the energy landscapes of the studied systems using disconnectivity graphs. The required inherent structures and transition states for the construction of disconnectivity graphs are found by combination of conjugate gradient and eigenvector-following methods. We show that it is possible to controllably induce new structures as well as reorder and stabilize existing structures that are characteristic of higher-lying minima. Moreover, it is shown that the selected structures can have experimentally relevant lifetimes.Comment: 12 pages, 14 figures, submitted to J. Chem. Phys. Reasons for replacing a paper: figures 2, 3, 7 and 11 did not show up correctl

Her Life Depends On It: Sport, Physical Activity and the Health and Well-Being of American Girls

This report is a comprehensive compendium of research that points to physical activity and sport as fundamental solutions for many of the serious health and social problems faced by American girls. An appreciable mass of evidence-based knowledge about girls' involvement with sport and physical activity has been generated during the last decade. The amount and quality of this research are uneven and varied. For example, a good deal of research examines the associations between physical activity and risk for coronary heart disease, but studies that focus on risk for Alzheimer's disease are just beginning to issue. Researchers have verified links between high school athletic participation and teen pregnancy prevention, although more longitudinal research is needed to thoroughly confirm the connections. Overall, however, this report shows that the current state of knowledge on the relationship of physical activity to the health and social needs of American girls warrants the serious attention of public health officials, educators and sport leaders

Her Life Depends on it III: Sport, Physical Activity and the Health and Well-being of American Girls and Women

Her Life Depends On It III is the Women's Sports Foundation's comprehensive report that reviews existing and emerging research on the links between participation in sport and physical activity and the health and wellbeing of American girls and women. As with the previous editions in 2004 and 2009, this study also confirms that physical activity and sport provides the critical foundation, in no small part, that allows girls and women to lead healthy, strong, and fulfilled lives. Ten years since its first publication, the updated Her Life Depends On It provides an even more comprehensive review of the ever-expanding body of research that demonstrates how important it is for girls and women to participate in sport and physical activity. The report's contents reflect the review of 1,500 studies, nearly 400 covered since the previous edition

Imagining wrong: fictitious contexts mitigate condemnation of harm more than impurity

Over five experiments we test the fictive pass asymmetry hypothesis. Following observations of ethics and public reactions to media, we propose that fictional contexts, such as reality, imagination, and virtual environments, will mitigate people’s moral condemnation of harm violations, more so than purity violations. That is, imagining a purely harmful act is given a “fictive pass,” in moral judgment, whereas imagining an abnormal act involving the body is evaluated more negatively because it is seen as more diagnostic of bad character. For Experiment 1, an undergraduate sample (N = 250) evaluated nine vignettes depicting an agent committing either violations of harm or purity in real life, watching them in films, or imagining them. For Experiments 2 and 3, online participants (N = 375 and N = 321, respectively) evaluated a single vignette depicting an agent committing a violation of harm or purity that either occurred in real life, was imagined, watched in a film, or performed in a video game. Experiment 4 (N = 348) used an analysis of moderated mediation to demonstrate that the perceived wrongness of fictional purity violations is explained both by the extent to which they are seen as a cue to, and a cause of, a poor moral character. Lastly, Experiment 5 (N = 484) validated our manipulations and included the presumption of desire as an additional mediator of the fictive pass asymmetry effects. We discuss implications for moral theories of act and character, anger and disgust, and for media use and regulation

Energy estimators for random series path-integral methods

We perform a thorough analysis on the choice of estimators for random series path integral methods. In particular, we show that both the thermodynamic (T-method) and the direct (H-method) energy estimators have finite variances and are straightforward to implement. It is demonstrated that the agreement between the T-method and the H-method estimators provides an important consistency check on the quality of the path integral simulations. We illustrate the behavior of the various estimators by computing the total, kinetic, and potential energies of a molecular hydrogen cluster using three different path integral techniques. Statistical tests are employed to validate the sampling strategy adopted as well as to measure the performance of the parallel random number generator utilized in the Monte Carlo simulation. Some issues raised by previous simulations of the hydrogen cluster are clarified.Comment: 15 pages, 1 figure, 3 table

Heat capacity estimators for random series path-integral methods by finite-difference schemes

Previous heat capacity estimators used in path integral simulations either have large variances that grow to infinity with the number of path variables or require the evaluation of first and second order derivatives of the potential. In the present paper, we show that the evaluation of the total energy by the T-method estimator and of the heat capacity by the TT-method estimator can be implemented by a finite difference scheme in a stable fashion. As such, the variances of the resulting estimators are finite and the evaluation of the estimators requires the potential function only. By comparison with the task of computing the partition function, the evaluation of the estimators requires k + 1 times more calls to the potential, where k is the order of the difference scheme employed. Quantum Monte Carlo simulations for the Ne_13 cluster demonstrate that a second order central-difference scheme should suffice for most applications.Comment: 11 pages, 4 figure

“The Dream of a Ridiculous Man”: Christian Hope for Human Society

“The Dream of a Ridiculous Man”: Christian Hope for HumanSociet