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To extend the limited evidence on how hot spot policing (HSP) strategies affect community experiences, perceptions, and attitudes, police agencies in two cities participated in a randomized experiment involving 102 hot spots that were assigned to a control condition (n = 51) or to receive a HSP program emphasizing patrol, community engagement, and problem-solving for 14–17 months during 2019 and 2020 (n = 51). Cross-sectional surveys with hot spot community members were conducted in person before the program (n = 1082) and, due to COVID-19, by mail and internet afterwards (n = 768) to assess program effects on crime victimization, views of crime and disorder, and attitudes towards police. In both cities, the evaluation period overlapped with the COVID-19 pandemic and the national protests for police reform following the killing of George Floyd by police in Minneapolis during 2020; in one city, the program was ongoing during these events. Results showed the program had few effects on community experiences and views, though there were some indications it may have improved perceptions of police legitimacy and police misconduct in one city. The findings suggest that HSP strategies do not have harmful effects on community perceptions and might improve some aspects of police-community relations. However, weak program implementation, challenges to survey administration, and the occurrence of both COVID-19 and the George Floyd incident during the study period complicate interpretation of the results. [ABSTRACT FROM AUTHOR]

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]

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]