Orientational order and topological defects in a dilute solutions of rodlike polymers at low Reynolds number.

The relationship between the polymer orientation and the chaotic flow, in a dilute solution of rigid rodlike polymers at low Reynolds number, is investigated by means of direct numerical simulations. It is found that the rods tend to align with the velocity field in order to minimize the friction with the solvent fluid, while regions of rotational disorder are related to strong vorticity gradients, and therefore to the chaotic flow. The "turbulent-like" behavior of the system is therefore associated with the emergence and interaction of topological defects of the mean director field, similarly to active nematic turbulence.

Online Child Sexual Exploitation and the Role of Computer-Mediated Communication: A Scoping Review.

The online landscape has shifted since the rise of smartphones and social media in the 2010s and altered the way children use technologies. Along with a reliance on computer-mediated communication (CMC) is the concern of online child sexual exploitation (OCSE). This scoping review provided an updated examination of the prevalence, risk factors, outcomes, and disclosures of OCSE since 2010.

Interviewing Asylum-Seeking Children: A Scoping Review of Research to Inform Best Practices.

Immigration interviews with asylum-seeking youth have been largely understudied. In domestic legal settings, children interviewed about abuse and maltreatment provide more detailed, relevant responses when asked open-ended questions and when interviewed in a neutral environment, among other supportive practices. In asylum settings, guidance for interviews with youth derives from the United Nations Convention on the Rights of the Child.

Flocking turbulence of microswimmers in confined domains.

We extensively study the Toner-Tu-Swift-Hohenberg model of motile active matter by means of direct numerical simulations in a two-dimensional confined domain. By exploring the space of parameters of the model we investigate the emergence of a new state of active turbulence which occurs when the aligning interactions and the self-propulsion of the swimmers are strong. This regime of flocking turbulence is characterized by a population of few strong vortices, each surrounded by an island of coherent flocking motion.

Salivary Cortisol Dynamics After Mild Traumatic Brain Injury.

Objective: To assess mild traumatic brain injury (mTBI)-related alterations in baseline (resting) salivary cortisol and cortisol reactivity to cognitive and exercise stressors, which are frequently encountered during mTBI rehabilitation and recovery.

Setting: Persons with mTBI were recruited from a level 1 trauma center emergency department. Uninjured controls (UCs) were recruited from the community.