Challenging stereotypes of teens: Reframing adolescence as window of opportunity.

In this review, we seek to challenge negative stereotypes of adolescence and unpack the many ways that the developing brain contributes to positive development during the adolescent years. In particular, we will show that risk-taking is not inevitable and risks can be highly adaptive and positive; adolescents are not overly self-centered but engage in other-oriented prosocial behaviors in remarkable ways; adolescents are not only susceptible to negative peer influence but can resist negative peer influence and conform more to positive peer influence; and adolescents do not orient away from the family, but the family remains a constant and important source of influence into adolescence. We outline considerations that researchers can use to reframe their research questions to provide a more balanced perspective on adolescent development, thereby promoting positive development.

Effects of continuous chelation on the instrumentation of curved canals with a martensitic NiTi file system: an ex vivo micro-CT evaluation.

This study aimed to evaluate the influence of continuous chelation on apical transportation and centrality in shaped curved canals prepared with a martensitic file system and evaluated by micro-CT. Twenty-four lower molar canals with a curvature of 25º-40º were scanned pre-operatively with micro-CT and divided into 2 groups according to two different irrigation regimens (n = 12). Group 1 was irrigated with NaOCl, group 2 with Dual Rinse.

Design of a Deployable Helix Antenna at L-Band for a 1-Unit CubeSat: From Theoretical Analysis to Flight Model Results.

The 3Cat-4 mission aims at demonstrating the capabilities of a CubeSat to perform Earth Observation (EO) by integrating a combined GNSS-R and Microwave Radiometer payload into a 1-Unit CubeSat. One of the greatest challenges is the design of an antenna that respects the 1-Unit CubeSat envelope while operating at the different frequency bands: Global Positioning System (GPS) L1 and Galileo E1 band (1575 MHz), GPS L2 band (1227 MHz), and the microwave radiometry band (1400-1427 MHz). Moreover, it requires between 8 and 12 dB of directivity depending on the band whilst providing at least 10 dB of front-to-back lobe ratio in L1 and L2 GPS bands.