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Stemming intimate partner violence among adults demands earlier education and skill-building supportive of healthy youth and young adult dating relationships. The current U.S.-based study examines a spectrum of youth and young adult relationship dynamics (RDs), inclusive of abusive interactions. In a nationally representative cohort of youth aged 10–18 at baseline and one parent or caregiver, survey responses regarding RDs from 618 participants ages 15–23 at wave 5 follow-up were analyzed. Latent class analysis of four positive dynamics, six problematic dynamics, and three scales of adolescent relationship abuse (ARA) were estimated, yielding four latent profiles of dating RDs. Relationships characterized by Unhealthy and Intense RDs both exhibited high probability of ARA but differed from each other in terms of other positive and problematic dynamics. Relationships characterized by Disengaged RDs had lower probability of ARA but elevated probability of awkward communications, negative feelings, social liability, and other challenging dynamics. Several baseline covariates were significantly associated with profiles of dating RDs approximately 5 years later. Younger participants were more likely to subsequently fall in an Intense or Disengaged RDs profile, as were participants with baseline emotional health problems. Further, classification in the Unhealthy RDs profile was less likely for participants reporting a better baseline relationship with their parents and more likely for those exposed to violence in childhood. These findings suggest that in addition to developmental maturity, youth and young adults would benefit from closer investigation and processing of past emotional and relational issues and traumas to foster healthier dating relationships. [ABSTRACT FROM AUTHOR]

A high-speed-level gear transmission system model of a wind turbine is presented considering a time-varying wind load and an electromagnetic torque disturbance, along with eccentricity, dynamic backlash, and friction force. The auto-regressive model is employed for simulating the time-varying wind load in the realistic wind field as external excitation. A doubly fed induction generator model of the wind turbine is established to calculate the disturbance quantity of electromagnetic torque. The nonlinear differential equations of the system are strictly deduced using Lagrange equation and solved by the fourth-order Runge-Kutta method. The effect of friction on the dynamic response of the high-speed-level gear transmission system is analyzed with the time-varying wind load and the electromagnetic torque disturbance. These results show that the friction force is critical because frequency amplitude and components can be changed by it. The friction force also enlarges vibration displacement. The low-frequency components in the vertical direction are affected gravely by the friction force without electrical disturbance. In addition, sidebands exist in the vicinity of the low-frequency parts as the electromagnetic torque disturbance appears at the output end. The amplitude of the low-frequency component is further increased because of electromagnetic torque disturbance. This shows the frequency characteristics of the slight gear system fault. The study offers some fresh references into the design and diagnosis of the gear system. [ABSTRACT FROM AUTHOR]

Law enforcement officers' health and wellness is important at the individual and community levels in terms of maintaining a fit workforce to uphold the mission of public safety. The current study was designed to assess officer wellness across the U.S. From a nationally representative random sample of 1,135 local and state agencies, a random, probability-based sample of officers was selected, oversampling for female officers. Latent class analyses were conducted to assess wellness profiles based on a set of eleven physical, psychological, and behavioral health indicators for 2,232 officers. Personal and professional characteristics were included as auxiliary variables in models of the resulting classes. Results from this sample indicated that over two-thirds of officers fit a healthy profile, whereas one in four officers presents with moderate health concerns and nearly 6% are classified in a profile of broad health concerns. In this sample, sexual assault in childhood, greater exposure to critical incidents, working a current rotation schedule, and being female were characteristics associated with broad health concerns. Emotional and/or physical assault in childhood, greater exposure to critical incidents, and being female were characteristics associated with moderate health concerns, whereas older age and being Hispanic were protective factors. In sum, full-time sworn law enforcement officers across the U.S. are reasonably healthy but their exposures to stressful situations put them at increased risk particularly in terms of post-traumatic stress, risky drinking, and suicidality. These results are important for agency administrators and policymakers to consider in terms of wellness programs, prevention efforts and budget allocations. [ABSTRACT FROM AUTHOR]

This study examines whether online sexual harassment (SH) is a unique form of behavior, separate and apart from in-person SH. Data were drawn from the National Survey on Teen Relationships and Intimate Violence (STRiV), a national representative household survey focused on youth interpersonal aggression. A weighted sample of 1,184 youth (12-21 years old) completed a baseline and a follow-up survey 1 year later. Through latent class analysis (LCA), we investigate our first research question of whether there are distinct classes/profiles of mutually exclusive online or in-person SH victims or whether they mostly overlap. Second, does there exist a high-rate group of SH victims who experience most of the SH behaviors both in-person and online? Third, what individual characteristics and behaviors, based on past research, are associated with these identified profiles of SH? LCA did not reveal an in-person-only or online-only SH class. The majority of the sample (78.5%) were represented in a Low/Near Zero SH class; 15.3% in a Sexual Orientation Harassment class suffering sexual orientation–related verbal harassment online and in-person; 4.2% in a Verbal SH class suffering verbal sexual comments, being forced to talk about sex, and being shown sexual pictures in-person and online; and 1.9% in a High SH class featured by a high probability of experiencing all online and in-person forms of SH. Biological sex, attitudes, anger, previous violence exposure, and gender stereotyping each predicted at least one latent class. The findings can help inform the design of more effective interventions to prevent SH, highlighting the overlapping nature of in-person and online SH. Prevention efforts designed to address in-person SH need to also consider online SH and vice versa. Clinicians should also consider the risk factors of SH identified in this study in their work identifying at-risk youth. [ABSTRACT FROM AUTHOR]

Sexual harassment continues to be a consistent destructive feature of American life and workplaces, especially in fields for which women are under-represented, such as law enforcement. We use one of the first nationally representative cross-sectional surveys (n = 2,867) of female and male law enforcement officers (LEOs) to assess the prevalence of workplace sexual harassment victimization. Next, we assess how risk factors are related to this harassment through multivariable modeling. We observed large differences between rates of sexual harassment for female compared to male officers on both our measures of non-physical and physical workplace sexual harassment (sexual assault). Our combined measure of non-physical sexual harassment and sexual assault of female officers (71%) was in the range found in prior research and our 41% rate for male officers is also not trivial and requires attention from law enforcement leaders. We tested two competing hypotheses on whether female officers (and possibly some male officers not meeting certain definitions of masculinity) viewed as the most threatening by virtue of their job role in the male-dominated hierarchy will have the highest probability of being a victim of workplace sexual harassment (power-threat model) or whether those viewed as the most vulnerable officers will have the highest probability of sexual harassment victimization (vulnerable-victim model). We found greater support for the vulnerable-victim model. We discuss the implications of these results for guiding training and prevention strategies to address sexual harassment in the law enforcement workplace. [ABSTRACT FROM AUTHOR]