Casimir operators of centrally extended l-conformal Galilei algebra

The full set of Casimir elements of the centrally extended l-conformal Galilei algebra is found in simple and tractable form.Comment: 5 page

Intralesional corticosteroid-induced hypopigmentation and atrophy

Intralesional corticosteroids are associated with various, uncommon, local adverse events [1]. Atrophy and hypopigmentation most commonlyremain localized to sites of injection. However, outward radiation in a linear, streaky pattern has been reported and is termed “perilesional/perilymphatic hypopigmentation or atrophy [2].” We report a case of this rare adverse event

Ergebnisbericht der Befragung von Teilnehmenden des Gasthörenden‐ und Seniorenstudiums (GHS) sowie von Regelstudierenden der Leibniz Universität Hannover zum Thema „Bildung im Alter“

Bericht über eine Fragebogenerhebung bei Seniorstudierenden und regulär Studierenden an den Universitäten Magdeburg und Hannover im Sommersemester 2014. Darstellung und Interpretation der Ergebnisse vor dem Hintergrund aktueller Studien und Literatur zum Thema Bildung im Alter

Inequalities of Professional Learning on Social Media Platforms

Professional learning on social media is generally framed as unproblematic, but the transition to these platforms marks a change as professionals’ work is conditioned by their logic and economy. In this paper, our focus is how problematic inequalities of teachers’ professional learning around access, participation and resources are produced as their professional exchanges is formed by social media participation. Three aspects of inequality have been examined. First, the performance of teachers’ (un)equal professional opportunities; second, (un)equal access to resources; and third, (un)equal existential opportunities for professional development. We draw on examination of three-years of API data from a large teacher Facebook-group asking, who can participate (gender, location), what voices are heard (status, language), and how does the social media platform condition professional exchange and participation? Our results consider the opportunities and costs for teachers as individuals, professionals and intellectuals. They reveal problematic temporal aspects such as work intensification, and limited professional exchange, partly conditioned by the platform functionality

B cell subset distribution in human bone marrow is stable and similar in left and right femur: An instructive case

The bone marrow (BM) is, in addition to being the site of B cell development, a tissue that harbors long-lived plasma cells (PC), the cells that protect the body against foreign antigens by continuous production of antibodies. Nothing is known about the long-term stability and functionality of both B cells and PC in the BM at the individual donor level since repeated sampling possibilities outside of oncology are scarce. Here, we had the opportunity to obtain BM samples from a patient undergoing bilateral total hip arthroplasty half a year apart. We observed that the frequencies of the analyzed B cell and PC subsets were similar despite a time of six months in between and sampling on left and right side of the body. Additionally, B cell receptor stimulation led to comparable results. Our data suggest that composition and functionality of B cells are stable in the BM of adults at the individual donor level

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ОТРАВЛЕНИ

Localizing Spatial Information in Neural Spatiospectral Filters

Beamforming for multichannel speech enhancement relies on the estimation of spatial characteristics of the acoustic scene. In its simplest form, the delay-and-sum beamformer (DSB) introduces a time delay to all channels to align the desired signal components for constructive superposition. Recent investigations of neural spatiospectral filtering revealed that these filters can be characterized by a beampattern similar to one of traditional beamformers, which shows that artificial neural networks can learn and explicitly represent spatial structure. Using the Complex-valued Spatial Autoencoder (COSPA) as an exemplary neural spatiospectral filter for multichannel speech enhancement, we investigate where and how such networks represent spatial information. We show via clustering that for COSPA the spatial information is represented by the features generated by a gated recurrent unit (GRU) layer that has access to all channels simultaneously and that these features are not source -- but only direction of arrival-dependent.Comment: Submitted to the 31st European Signal Processing Conference (EUSIPCO 2023), Helsinki, Finland. 5 pages, 3 figure

Influences on the Automated Assembly of Hybrid Microsystems with High Accuracy

Nowadays, an ongoing trend of miniaturization of products and components can be observed in nearly all application areas in the world. As for microsystems, a distinction is drawn between monolithic and hybrid microsystems. The latter group requires some kind of assembly process. For the assembly of hybrid microsystems, a high assembly accuracy in the range of a few micrometers is required. In order to reach this accuracy, an assembly system for sensor guided microassembly has been developed at the Collaborative Research Centre 516 “Design and manufacturing of active micro systems”. This paper describes the design of a system for automated assembly of hybrid microsystems. The influences on the accuracy will be analyzed on the basis of an example for an automated assembly process