Role of Surface Roughness in Hysteresis during Adhesive Elastic Contact

In experiments that involve contact with adhesion between two surfaces, as found in atomic force microscopy or nanoindentation, two distinct contact force (P) vs. indentation-depth (h) curves are often measured depending on whether the indenter moves towards or away from the sample. The origin of this hysteresis is not well understood and is often attributed to moisture, plasticity or viscoelasticity. Here we report experiments that show that hysteresis can exist in the absence of these effects, and that its magnitude depends on surface roughness. We develop a theoretical model in which the hysteresis appears as the result of a series of surface instabilities, in which the contact area grows or recedes by a finite amount. The model can be used to estimate material properties from contact experiments even when the measured P-h curves are not unique.     

predicting job decisions in tomorrow's workforce

The Job Decision Factors Survey used policy capturing to measure the influence of 7 factors on job decisions. Data from 400 undergraduate students at a large university, 88% 18–25 years of age, 12% 25–65 years of age, 82% female, 54% White, 21% Asian, 10% Black, 10% Hispanic, 1% American Indian, were included in a regression analysis. Hypothesis 1, the significance of the 7‐factor model, was supported (R² = .02). Hypothesis 2, opportunities to learn accounting for more variance than compensation, was supported (β = .11, β = .06, respectively). Job counselors should consider highlighting learning opportunities when counseling or interviewing similar populations.     

The Pragmatic Force of Making an Argument

Topoi - Making arguments makes reasons apparent. Sometimes those reasons may affect audiences’ relationships to claims (e.g., accept, adhere). But an over-emphasis on audience effects...     

Student's metamemory knowledge about the impact of stereoscopic three‐dimensional presentations of science content

We investigated students' knowledge and beliefs about the impact of using three‐dimensional (3D) multimedia presentations. Students listened to a lecture about the ventricular system, which was presented alone (Experiment 1 only) or with a 3D or a 2D video illustrating the system. Afterwards, students judged how well they would perform on a criterion test. In Experiment 1, students judged that the 3D presentation would be superior to listening to the lecture alone (d = 0.81). Mean judgments were higher for the 3D than 2D presentation (d = 0.24), but this difference was not significant, so we estimated the effect size again. In Experiment 2, judgments were significantly higher after the 3D than 2D presentations (d = 0.40). Test performance was not significantly greater after the 3D than 2D presentations. A survey study again revealed that students believe 3D presentations are superior, and most students reported preferring them to 2D presentations.     

Patient and Partner Quality of Life and Psychosocial Adjustment Following Radical Prostatectomy

We prospectively examined differences in quality of life and psychosocial adjustment in 80 prostate cancer patients and their partners (n = 65) beginning before radical prostatectomy and proceeding across the first year postsurgery. Both members of the couple experienced significant changes associated with the patient's cancer, however their experiences differed in some regards. Patients experienced reprieve from emotional distress and negative affect immediately following surgery despite worsened physical functioning. Partner quality of life and psychosocial adjustment scores were generally more constant from presurgery to postsurgery, with improvements noted 1 year later. For both patients and partners, cancer-specific stress symptoms declined progressively over the year. We also obtained partial support for the effectiveness of a single-session communication intervention on patient social/family wellbeing and partner general stress. Findings have implications for patient and partner adjustment following radical prostatectomy, and attest to the importance of incorporating partner evaluations into psychosocial oncology research.     

Why Parents Matter!: The Conceptual Basis for a Community-Based HIV Prevention Program for the Parents of African American Youth

The Parents Matter! Program (PMP) is a community-based family intervention designed to promote positive parenting and effective parent-child communication about sexuality and sexual risk reduction. Its ultimate goal is to reduce sexual risk behavior among adolescents. PMP offers parents instruction and guidance in general parenting skills related to decreased sexual risk behavior among youth (e.g., relationship building, monitoring) and sexual communication skills necessary for parents to effectively convey their values and expectations about sexual behavior—as well as critical HIV, STD, and pregnancy prevention messages—to their children. We briefly review the literature concerning parental influences on adolescent sexual risk behavior and present the conceptual model and theoretical foundation upon which PMP is based.     

Development of an Interactive Decision Aid for Female BRCA1/BRCA2 Carriers

Shared decision making between patients and providers is becoming increasingly common, particularly when there is no clear preferred course of action. As a result, decision aids are being adopted with growing frequency and have been applied to many medical decision-making issues. One such issue where there is uncertainty is breast cancer risk management among BRCA1/BRCA2 carriers. We present the development of a CD-ROM decision aid to facilitate risk management decision making in this population. Our decision aid was developed with the intention of providing it through a randomized clinical trial. The CD-ROM is a multimedia, interactive intervention which provides information about breast cancer, risks associated with BRCA1 and BRCA2 mutations, risk management options for hereditary breast cancer, and a breast cancer risk management decision aid. The goal of this CD-ROM, offered as an adjunctive intervention, is to reduce decisional conflict and psychological distress and improve comprehension of risk information, decisional satisfaction, medical adherence, and quality of life for this population of women at increased risk for breast cancer.     

Not a Laughing Matter: Sexual Harassment as “Material” on Workplace-Based Situation Comedies

In her book Sexual Harassment of Working Women Catherine MacKinnon (1979) suggested that “Trivialization of sexual harassment has been a major means through which its invisibility has been enforced. Humor, which may reflect unconscious hostility, has been a major form of that trivialization” (p. 52). In other words, making jokes at women's expense and treating sexual harassment as not serious have contributed to its persistence. Situation comedies can be seen as gauges for what is considered humorous in American culture. To explore the tone of and mood toward sexual harassment in contemporary American society, themes and content of “humorous” material on 56 episodes of five workplace-based situation comedies were examined. Results showed that although sexual harassment is rarely discussed on situation comedies, gender harassment is frequently used as “material,” which leads to further trivialization of a serious social problem.     

Shape‐ and Trait‐Congruency: Using Appearance‐based Cues as a Basis for Product Recommendations

This research demonstrates that a consumer's physical appearance—and, more specifically, his or her body size—predictably influences the product(s) that the consumer is recommended. Four studies conducted in both field and lab settings show that agents more frequently recommend round (vs. angular) shaped products to heavier targets, notably for products and categories in which body size is irrelevant (e.g., lamps and perfume). We attribute this to a combination of shape‐congruency and trait‐congruency, whereby individuals choose products for others based on shared dimensions of the person and product.