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1. Electrocaloric Effect of Perovskite High Entropy Oxide Films

   https://doi.org/10.1002/aelm.202200352  

   Son, Yeongwoo; Zhu, Wanlin; Trolier‐McKinstry, Susan E. (December 2022, Advanced Electronic Materials)
2. Effect of COVID on a High School Engineering Curriculum

   Reid, K. J.; Griesinger, T. M. (July 2021, 2021 ASEE Virtual Annual Conference Content Access, Virtual Conference)

   null (Ed.)

   The COVID-19 pandemic disrupted education on all fronts with no warning. The response from K-12 education’s transition has not been as straight forward. Existing issues of equity, access, and inclusion required school districts, schools, and teachers to adopt a variety of solutions, including no instruction, online instruction, and shipping materials/supplies to students at home. The pilot cohort of [program name] teachers provides a unique opportunity to understand how teachers had to transition, especially when implementing a new and innovative engineering curriculum. An anonymous social media post had some interesting insight: “We gave educators almost no notice. We asked them to completely redesign what school looks like, and in about 24 hours, local teachers and administrations fixed it. No state or national agency did this, the local educators fixed it in HOURS. In the midst of a global crisis. In fact, state and national policies actually created roadblocks. Local schools figured out how to work around these. No complaining, no handwringing, just solutions and amazingly clever plans. Get out of the way of a teacher and watch with amazement at what really happens.” We know that high schools adapted quickly. This work-in-progress discusses initial findings from teacher interviews on what happened during this unforeseen and unique transition. Teacher interviews were supplemented with data from teacher focus groups, with data analyzed to examine the impact of the COVID-19 disruption from the perspective of a teacher new to an engineering curriculum. Specifically, we will examine the following research question: How did the pilot year [program name] teachers adapt and deliver the curriculum during the COVID-19 disruption? We are exploring teacher delivery of the [program name] curriculum through a variety of levels to capture the drivers that prompted decisions, identify pedagogical adjustments, and identify drivers behind the chosen changes. 

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3. The Photo‐Hall Effect in High‐Mobility Organic Semiconductors

   https://doi.org/10.1002/adfm.202006178  

   Bruevich, Vladimir; Choi, Hyun_Ho; Podzorov, Vitaly (November 2020, Advanced Functional Materials)

   Abstract High‐mobility crystalline organic semiconductors are important for applications in advanced organic electronics and photonics. Photogeneration and transport of mobile photocarriers in these materials, although very important, remain underexplored. The photo‐Hall effect can be used to address the fundamental charge transport properties of these functional molecular materials, without the need for fabricating complex transistor devices or chemical doping. Here, a photo‐Hall effect is demonstrated in organic semiconductors, using a benchmark molecular system rubrene as an experimental platform. It is shown that this technique can be used to directly measure the charge carrier mobility and photocarrier density, decouple the surface and bulk transport phenomena, and thus significantly deepen the understanding of the mechanism of photoconductivity in these high‐performance molecular materials. 

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4. Effect of nickel on the high-pressure phases in FeH

   https://doi.org/10.1103/physrevb.104.224106  

   Piet, Helene; Chizmeshya, Andrew V.; Chen, Bin; Chariton, Stella; Greenberg, Eran; Prakapenka, Vitali B.; Shim, Sang-Heon (December 2021, Physical Review B)
5. Effect of Viscosity on High-Throughput Deterministic Lateral Displacement (DLD)

   https://doi.org/10.3390/micro2010006  

   Senf, Brian; Kim, Jong-Hoon (March 2022, Micro)

   Biosample analysis often requires the purification, separation, or fractionation of a biofluid prior to transport to the biosensor. Deterministic lateral displacement (DLD) is a size-based microfluidic separation technique that shows promise for biosample preparation. Recently, high-throughput DLD separation has been demonstrated with airfoil-shaped pillars at higher flow rates, but this also changes separation dynamics as the Reynolds number (Re) increases. In this work, the particle trajectories in the airfoil DLD with two different angle-of-attacks (AoAs) were studied at a range of Re with alterations of fluid viscosity to mimic biological fluids. Previous studies have found that the critical diameter (Dc) decreases as Re climes. We demonstrated that variations of the fluid viscosity do not alter the separation dynamics if the Re is kept constant. As the associated Re of the flow increases, the Dc decreases regardless of viscosity. The negative AoA with an airfoil DLD pillar design provided the stronger Dc shift to negate pressure increases. 

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