1585 The “6Pm Series” Addressing Medical Education for Final Year Medical Students During the Pandemic

Aim Free clinical teaching online delivered by NHS junior doctors to address a drop in face-to-face teaching. Method We created a block-based syllabus of topics that are commonly examined and created an SBA format series of online lectures. The lectures were delivered online and the lectures were carried out by NHS doctors. We delivered 30 continuous lectures in a 30-day period that covered a variety of topics. Each lecture lasted between 45 to 60 minutes and featured real time interactive mcqs which the students had a limited time to answer to simulate exam conditions. We also maintained a unique conference like format where the lecture provider would also be assisted by a ‘host' who would provide an environment that simulated a real-life lecture with a back-and-forth conversation. Lastly each session was reinforced with a feedback survey at the end which helped us improve our service but also provided key indicators on the needs of the audience. Results We were able to provide a series of lectures that on average had a viewership of 120-150 attendees per lecture and grew a social media following of 3500 people. Although the following on social media is not a full reflection of our reach. A good indication is our prescribing safety assessment series which attracted over 2000 people interested and 260 confirmed for one event. Conclusions We feel that the format we followed in delivering medical teaching provided a very effective format and we hope to continue this into the future.

Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis

A layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed in the literature for CLC between two substrates with periodic photo-alignment: one with the director parallel to the substrates and one with the director in the bulk parallel to the tilted plane. The transmission experiments under large angles of incidence (AOI) presented in this work prove that, in the bulk, the director does not remain parallel with the substrates. Because of the inclined helical axis, the full reflection band can be observed at a smaller AOI than in planar CLC. For sufficiently large AOI, the reflection of diffracted light is prohibited by total internal reflection and efficient diffraction occurs in the forward direction.

Influence of restoration age on egg bank richness and composition: an ex situ experiment

Zooplankton community assembly after flooding in temporary ponds depends mostly on abundance and diversity of the dormant propagule bank. However, our understanding of the hatching patterns of zooplankton is imperfect. We performed an ex situ experiment to study the species composition and temporal sequence of zooplankton emergence from sediments in three ponds that were restored at different times: 1998, 2003 and 2007. The patterns of species hatching observed in our microcosms were compared with the emergent zooplankton community of their equivalent, synchronically inundated ponds. An escalation in species richness and a delay in hatching time were detected with increasing restoration age. In addition, some discrepancies between the egg bank and active populations were observed, especially in the oldest pond. This study illustrates the use of hatching experiments in comparing ponds with different characteristics. Nevertheless, egg bank hatching and water column sampling should complement each other in order to afford a full reflection of past diversity and contribute to a better understanding of the efficiency of restoration practices.

Study on the Influence of Volute to Flow-Induced Noise in Centrifugal Pump

More and more attention has been attached on flow-induced noise of centrifugal pump in recent years because of strict environmental noise restrictions and demands of clients.. In this paper, the role of volute impacted on flow-induced noise generation and propagation in centrifugal pump were summarized. The process of internal wave propagation was analyzed, and the transmission coefficient and loss of volute were calculated; In order to compare the effect of volute vibration on the sound field in a centrifugal pump, a hybrid algorithm based on CFD + BEM was adopted. The results reveals that: full reflection of sound wave occurs on the fluid-steel volute wall when the incidence angle is more than or equal to 13.8 °; otherwise a sound transmission appears; For onshore pumps, For onshore pumps the A-weighted sound transmission loss is more than 55dB under the condition that thickness volute is not less than 8mm; For submersible pumps, all-bottom sound below 3000Hz almost transmits to the outside field entirely; structure acoustic coupling between volute and the internal sound field influence little on directivity of sound field and the change of law, but structure vibration would average the sound pressure level in frequency.

Dynamics of Symmetric Dynamical Systems with Delayed Switching

We study dynamical systems that switch between two different vector fields depending on a discrete variable and with a delay. When the delay reaches a problem-dependent critical value, so-called event collisions occur. This paper classifies and analyzes event collisions, a special type of discontinuity-induced bifurcations, for periodic orbits. Our focus is on event collisions of symmetric periodic orbits in systems with full reflection symmetry, a symmetry that is prevalent in applications. We derive an implicit expression for the Poincaré map near the colliding periodic orbit. The Poincaré map is piecewise smooth, finite-dimensional, and changes the dimension of its image at the collision. In the second part of the paper we apply this general result to the class of unstable linear single-degree-of-freedom oscillators where we detect and continue numerically collisions of invariant tori. Moreover, we observe that attracting closed invariant polygons emerge at the torus collision.