Studies of fiber-matrix adhesion on compression strength

A study was initiated on the effect of the matrix polymer and the fiber matrix bond strength of carbon fiber polymer matrix composites. The work includes tests with micro-composites, single ply composites, laminates, and multi-axial loaded cylinders. The results obtained thus far indicate that weak fiber-matrix adhesion dramatically reduces 0 degree compression strength. Evidence is also presented that the flaws in the carbon fiber that govern compression strength differ from those that determine fiber tensile strength. Examination of post-failure damage in the single ply tests indicates kink banding at the crack tip

Beyond Outdated Magazines and Motivational Posters: How to Make Offices Safer and More Assessable

Office spaces are the first in-person introduction for individuals to access services. However, these spaces are frequently, even if unintentionally, biased against marginalized and underserved populations. Cuthbert and Taylor (2019) noted the importance of inclusive language and heightened awareness of physical requirements for spaces as ways to impact a sense of connectedness to an environment. Hartal (2018) encourages open communication among staff regarding issues related to diversity and celebrating individual differences. These discussions and trainings can help dismantle microaggressions and empower employees to address othering behavior in an assertive and meaningful way (Fox & Ore, 2010). This presentation will address multiple potential diversity concerns in the office setting by creating meaningful steps individuals and organizations can take to make spaces more welcoming and inclusive

Two-color polarization control on angularly resolved attosecond time delays

Measured photoionization time delays may exhibit large variations as a function of the emission angles, even for spherically symmetric targets, as shown in recent RABBITT (reconstruction of attosecond beating by interference of two-photon transitions) experiments. The contributions from different pathways to the two-photon quantum channels can already explain the observed phase jumps that shape those angular distributions. Here, we propose a simple analytical model to describe angularly-resolved RABBITT spectra as a function of the relative polarization angle between the ionizing attosecond pulse train and the assisting IR field. We demonstrate that the angular dependencies of the measured delays can be analytically predicted and the position of the phase jumps reduced to the analysis of a few relevant parameters.Comment: 10 pages, 4 figure

Beyond Halo and Wedge: Visualizing out-of-view objects on head-mounted virtual and augmented reality devices

Head-mounted devices (HMDs) for Virtual and Augmented Reality (VR/AR) enable us to alter our visual perception of the world. However, current devices suffer from a limited field of view (FOV), which becomes problematic when users need to locate out of view objects (e.g., locating points-of-interest during sightseeing). To address this, we developed and evaluated in two studies HaloVR, WedgeVR, HaloAR and WedgeAR, which are inspired by usable 2D off-screen object visualization techniques (Halo, Wedge). While our techniques resulted in overall high usability, we found the choice of AR or VR impacts mean search time (VR: 2.25s, AR: 3.92s) and mean direction estimation error (VR: 21.85°, AR: 32.91°). Moreover, while adding more out-of-view objects significantly affects search time across VR and AR, direction estimation performance remains unaffected. We provide implications and discuss the challenges of designing for VR and AR HMDs