cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extensions of Picard 2-Stacks and the cohomology groups Ext^i of length 3 complexes
Creators: name: Bertolin, Cristiana
name: Tatar, Ahmet Emin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 18G15

description: The aim of this paper is to define and study the 3-category of extensions of Picard 2-stacks over a site S and to furnish a geometrical description of the cohomology groups Ext^i of length 3 complexes of abelian sheaves. More precisely, our main Theorem furnishes (1) a parametrization of the equivalence classes of objects, 1-arrows, 2-arrows, and 3-arrows of the 3-category of extensions of Picard 2-stacks by the cohomology groups Ext^i, and (2) a geometrical description of the cohomology groups Ext^i of length 3 complexes of abelian sheaves via extensions of Picard 2-stacks. To this end, we use the triequivalence between the 3-category of Picard 2-stacks and the tricategory T^[-2,0](S) of length 3 complexes of abelian sheaves over S introduced by the second author in arXiv:0906.2393, and we define the notion of extension in this tricategory T^[-2,0](S), getting a pure algebraic analogue of the 3-category of extensions of Picard 2-stacks. The calculus of fractions that we use to define extensions in the tricategory T^[-2,0](S) plays a central role in the proof of our Main Theorem.
description: 2 New Appendix: in the first Appendix we compute a long exact sequence involving the homotopy groups of an extension of Picard 2-stacks, and in the second Appendix we sketch the proof that the fibered sum of Picard 2-stacks satisfies the universal property
Job Insecurity and Financial Distress
Creators: name: Giannetti, Caterina
name: Madia, Marianna
name: Moretti, Luigi
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2013
Subjects: SECS-P/05 Econometria

description: This paper investigates the effects of different job categories on households’ likelihood of experiencing financial distress. Given imperfect financial markets and the absence of unemployment subsidies, households with less secure jobs are likely to experience drops in income more frequently than households with well-protected jobs. Households’ abilities to deal with financial decisions (i.e. financial literacy) can mitigate these problems. Our results suggest that greater job insecurity increases the probability of being in financial distress similarly than other working statuses (e.g. unemployment), and in some cases even more (i.e. part-time workers). However, a high level of financial literacy can counterbalance this effect, especially for atypical workers.
Multiple DOF for X-ray CT Hydrocarbon Exploration
Creators: name: Sandoval, Mario
name: Turner, Martin
name: Morris, Tim
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Human centered computing
Interaction techniques
Scientific visualization
Interaction devices

description: Explorations of visualisation of computed tomography (CT) volumes involve multiple types of observations and interactions at various viewing positions. This short paper presents a case study using a new framework that leverages having multiple DOF for computer graphics visualisations of X-Ray CT 3D reconstructed volumes for hydrocarbon exploration within Drishti, an industrial visualisation software package.
description: Computer Graphics and Visual Computing (CGVC)
description: Data and Visualisation
description: 11
description: 14
description: Mario Sandoval, Martin Turner, and Tim Morris
description: CCS Concepts: Human-centered computing --> Interaction techniques; Scientific visualization; Interaction devices
Europeistica.
Saggi surreali e recensioni iperboliche di Graziella Tonfoni sulle opere di Tonfoni Graziella 2012-2013
Creators: name: Tonfoni, Graziella
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2013
Subjects: L-FIL-LET/10 Letteratura italiana
L-FIL-LET/14 Critica letteraria e letterature comparate

description: Saggi concepiti e composti in assonometria retorica, dall'autrice nel periodo 2012-2013. Si tratta di una sostanziosa collezione di recensioni iperboliche e di saggi surreali, della scienziata dell'informazione, che medita sulle sue opere letterarie. Distribuiti presso varie redazioni, sono qui raccolti con l'impegno che, qualora le riviste o le antologie, che li hanno ricevuti prima, intendessero comunque pubblicarli in futuro, bibliograficamente citando gli originali, come apparsi in Europeistica, sarebbero autorizzate a riproporli per intero o in parte, anche adattandoli e traducendoli, per altre sedi accademiche di euro-zona.
Micropsectra bodanica Reiss 1969
Creators: name: Bitušík, Peter
name: Slobodníková, Veronika
name: Novikmec, Milan
name: Dudáš, Adam
name: Hamerlík, Ladislav
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Micropsectra
Micropsectra bodanica

description: Micropsectra bodanica Reiss, 1969
Material examined.
• 1 male, Lake Vinderel (M 2), 1 July 2023.
Distribution.
Palaearctic. The species has so far been recorded from only a few countries, such as Germany, Austria, and Portugal, with its occurrence in Corsica and Slovakia not yet confirmed (Moubayed-Breil and Ashe 2012; Novikmec et al. 2015).
Habitat.
Ecological requirements of the species are still inadequately understood. Reiss (1969) considered the species (together with M. attenuata) as cold stenothermic and polyoxybiontic, typically inhabiting mosses on stones in springs and the upper stretches of streams (see also Langton and Visser 2003). Records of the pupal exuviae of M. attenuata / bodanica in the Western Carpathians come from headwater streams (one even artificially modified) with stony bottoms but without moss growths (Novikmec et al. 2015). It can be assumed that the collected adult male comes from a spring or small stream flowing in Lake Vinderel.
Remarks.
Since the pupal exuviae of M. bodanica are indistinguishable from those of M. attenuata (Langton and Visser 2003), the first record of M. bodanica based on an adult male in Romania is particularly valuable.
description: Published as part of Bitušík, Peter, Slobodníková, Veronika, Novikmec, Milan, Dudáš, Adam & Hamerlík, Ladislav, 2025, Chironomidae (Diptera) from mountain lakes of the Eastern Carpathians, Romania: First records and insight into diversity, pp. 107-123 in ZooKeys 1233 on pages 107-123, DOI: 10.3897/zookeys.1233.142856
Query Optimization Using Genetic Algorithms in the Vector Space Model
Creators: name: Mashagba, Eman Al
name: Mashagba, Feras Al
name: Nassar, Mohammad Othman
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: In information retrieval research; Genetic Algorithms (GA) can be used to find global solutions in many difficult problems. This study used different similarity measures (Dice, Inner Product) in the VSM, for each similarity measure we compared ten different GA approaches based on different fitness functions, different mutations and different crossover strategies to find the best strategy and fitness function that can be used when the data collection is the Arabic language. Our results shows that the GA approach which uses one-point crossover operator, point mutation and Inner Product similarity as a fitness function is the best IR system in VSM.
description: 7 pages; ISSN (online): 1694-0814 This paper has been withdrawn by the author due to a crucial errors in table: 2,3,4,5,6 and in the results
Micropsectra notescens
Creators: name: Bitušík, Peter
name: Slobodníková, Veronika
name: Novikmec, Milan
name: Dudáš, Adam
name: Hamerlík, Ladislav
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Micropsectra
Micropsectra notescens

description: Micropsectra notescens (Walker, 1856)
Material examined.
• 26 pupal exuviae, Lake Buhaescu 2 (R 10), 5 July 2023 • 22 pupal exuviae, Lake Buhaescu 3 (R 11), 5 July 2023.
Distribution.
Palaearctic. Widespread in Europe including the Canary Islands (Langton and Visser 2003); also recorded in Morocco (Kettani and Langton 2011).
Habitat.
Traditionally, the species is considered cold stenothermic and polyoxybiontic (Säwedal 1976). It has been documented in mountain, boreal and woodland springs and spring brooks (Orendt 2000; Ilmonen et al. 2009; Lencioni et al. 2012), as well as alpine lakes and ponds (Bitušík et al. 2006; Oertli et al. 2010; Lods-Crozet et al. 2012). However, data from low-altitude streams suggest a wider temperature tolerance (Móra and Szivák 2012). Its presence in temporary habitats, such as fountains (Oboňa et al. 2017) and temporarily flooded wetlands (Lundström et al. 2010), indicates a high distribution potential of females.
Remarks.
The presence of M. notescens in Romania has already been reported by Säwedal (1976) based on two males collected by Andrzej Kownacki from the Fagaras Mts. However, the species is not listed in the latest checklist of Romanian Chironomidae (Tatole 2023).
description: Published as part of Bitušík, Peter, Slobodníková, Veronika, Novikmec, Milan, Dudáš, Adam & Hamerlík, Ladislav, 2025, Chironomidae (Diptera) from mountain lakes of the Eastern Carpathians, Romania: First records and insight into diversity, pp. 107-123 in ZooKeys 1233 on pages 107-123, DOI: 10.3897/zookeys.1233.142856
Arts vs Engineering: The Choice among Consumption and Investment in Education
Creators: name: Romano, Richard
name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2013
Subjects: SECS-P/01 Economia politica

description: In this paper we develop a model in which students choose their university courses according to both investment and consumption incentives. We show that in the private problem, the education decisions are inefficient compared to the social optimum. The result is driven by the fact that students do not consider an externality of acquiring education for investment purposes in the working environment. We show that it is possible to design tuition fees in such a way that students acquire the socially optimal level of education.
Design Guidelines for Virtual Neurological Procedures
Creators: name: Mancosu, Mattia S.
name: Czanner, Silvester
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Applied computing
E
learning
Human centered computing
Virtual reality
Computing methodologies
Simulation environments

description: The role of technology has become more and more preponderant for educational purposes in schools, in universities and for training. It is also applied in healthcare and neurology training thanks to the proven effectiveness and the rising demand inside hospitals and medical schools. The necessity to outline design guidelines is increasing hand to hand with the aforementioned phenomenon. In this paper we will discuss some key aspects of a healthcare teaching application such as the fidelity of the learning environment, the target platform of the application with a particular focus on Virtual Reality, and the learning strategies that can be implemented within the program. We will also illustrate some results of our stroke assessment training application, where we proved the effectiveness of the proper implementation of some design aspects that we addressed inside the guidelines section.
description: Computer Graphics and Visual Computing (CGVC)
description: Data and Visualisation
description: 15
description: 19
description: Mattia S. Mancosu and Silvester Czanner
description: CCS Concepts: Applied computing --> E-learning; Human-centered computing --> Virtual reality; Computing methodologies --> Simulation environments
Numerical assessment of the residual stress formation in rotary friction welding
Creators: name: Rößler, Christoph
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: Fügetechnik
subject: Materialsimulation
subject: 671.529

description: The present work addresses the estimation of residual stresses in rotary friction welded components using a structural simulation. The starting point is a process simulation for friction welding, which has been elaborated in prior works to predict the temperatures and the material flow. This model is unsuitable for residual stress predicitons, however, due to its underlying material model among other reasons. Therefore, the material simulation is a major focus of this work. Because of their wide use in friction welding applications, the focus shall be on steels. In this work, a practical parameterization for a phenomenological phase transformation model is proposed and the flow properties of the material are derived based on the phase transformation points. The predicted phase transformations are validated by hardness measurements, and the flow properties by non-isothermal hot tensile testing. The developed model is capable of reproducing various examples and phenomena from literature and from industrial applications that are associated with high residual stresses. In addition, general recommendations for a residual stress compliant design have been derived.
description: Die vorliegende Arbeit befasst sich mit der Abschätzung der Eigenspannungen in reibgeschweißten Bauteilen mithilfe einer Struktursimulation. Den Ausgangspunkt bildet eine Prozesssimulation für das Reibschweißen, welche in vorangegangen Arbeiten entwickelt worden ist, um die Temperaturen und den Materialfluss zu prädiktieren. Unter anderem durch das zugrundeliegende Materialmodell ist diese jedoch zur Eigenspannungsvorhersage ungeeignet, weshalb die Materialsimulation einen wesentlichen Arbeitsschwerpunkt darstellt. Angesichts der hohen industriellen Verbreitung liegt der Fokus hier auf Stählen. In der Arbeit wird eine praktische Parametrisierung für ein phänomenologisches Phasenumwandlungsmodell vorgeschlagen und es werden ausgehend von den Phasenumwandlungspunkten die Fließeigenschaften des Stahls abgeleitet. Die Validierung der prädiktierten Phasenumwandlungen erfolgt anhand von Härtemessungen, die der Fließeigenschaften anhand von anisothermen Warmzugversuchen. Das erstellte Modell ist in der Lage verschiedene Beispiele und Phänomene aus der Literatur und Praxis abzubilden, die im Zusammenhang mit hohen Eigenspannungen stehen. Darüber hinaus sind allgemeine Empfehlungen für eine eigenspannungsgerechte Gestaltung abgeleitet worden.
Phase transitions in dense matter and the maximum mass of neutron stars
Creators: name: Chamel, N.
name: Fantina, A. F.
name: Pearson, J. M.
name: Goriely, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The recent precise measurement of the mass of pulsar PSR J1614$-$2230, as well as observational indications of even more massive neutron stars, has revived the question of the composition of matter at the high densities prevailing inside neutron-star cores. We study the impact on the maximum possible neutron-star mass of an "exotic" core consisting of non-nucleonic matter. For this purpose, we study the occurrence of a first-order phase transition in nucleonic matter. Given the current lack of knowledge of non-nucleonic matter, we consider the stiffest possible equation of state subject only to the constraints of causality and thermodynamic stability. The case of a hadron-quark phase transition is discussed separately. The purely nucleonic matter is described using a set of unified equations of state that have been recently developed to permit a consistent treatment of both homogeneous and inhomogeneous phases. We then compute the mass-radius relation of cold nonaccreting neutron stars with and without exotic cores from the Tolman-Oppenheimer-Volkoff equations. We find that even if there is a significant softening of the equation of state associated with the actual transition to an exotic phase, there can still be a stiffening at higher densities closer to the center of the star that is sufficient to increase the maximum possible mass. However with quarks the maximum neutron-star mass is always reduced by assuming that the sound speed is limited by $c/\sqrt{3}$ as suggested by QCD calculations. In particular, by invoking such a phase transition, it becomes possible to support PSR J1614$-$2230 with a nucleonic equation of state that is soft enough to be compatible with the kaon and pion production in heavy-ion collisions.
description: 9 pages, 8 figures
Diffusion capacitance effect on the response of monolithic nonlinear transmission lines
Creators: name: Bartolucci, Giancarlo
name: Marcelli, Romolo
name: Müller, Alexandru
name: Simion, Stefan
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: In this paper, the effect of the diffusion capacitance upon the electrical performances of the nonlinear transmission lines (NLTLs) is investigated. A comparison between the results obtained for the second harmonic generation by modeling the NLTL with and without the diffusion capacitance is presented. Numerical simulations, performed by means of the harmonic balance method implemented on the Hewlett Packard Microwave Design System Software Package, show significant differences when the diffusion capacitance is included in the NLTL model in comparison with the standard modeling of the NLTL by neglecting this capacitance.
Training Dataset Construction for Anomaly Detection in Face Anti-spoofing
Creators: name: Abduh, Latifah
name: Ivrissimtzis, Ioannis
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Computing methodologies
Computer vision tasks
Image manipulation

description: Anomaly detection, which is approaching the problem of face anti-spoofing as a one-class classification problem, is emerging as an increasingly popular alternative to the traditional approach of training binary classifiers on specialized anti-spoofing databases which contain both client and imposter samples. In this paper, we discuss the training protocols in the existing work on anomaly detection for face anti-spoofing, and note that they use images exclusively from specialized anti-spoofing databases, even though only common images of real faces are needed. In a proof-of-concept experiment, we demonstrate the potential benefits of adding in the anomaly detection training sets images from general face recognition, rather than specialised face anti-spoofing, databases, or images from the in-the-wild images. We train a convolutional autoencoder on real faces and compare the reconstruction error against a threshold to classify a face image as either client or imposter. Our results show that the inclusion in the training set of in-the-wild images increases the discriminating power of the classifier on an unseen database, as evidenced by an increase in the value of the Area Under the Curve.
description: Computer Graphics and Visual Computing (CGVC)
description: Computer Vision
description: 21
description: 26
description: Latifah Abduh and Ioannis Ivrissimtzis
description: CCS Concepts: Computing methodologies --> Computer vision tasks; Image manipulation
Microwave amplifier design using fuzzy genetic algorithm
Creators: name: Günel, Tayfun
name: Yazgan, Bingül
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: In this work, a new approach based on fuzzy genetic algorithm for the design of microwave amplifier in a given frequency band with requirements about stability and realizability, in addition to the transducer gain and flatness is presented. Nonuniform transmission lines are used to design input and output impedance matching circuits. An example is also considered.
Iterative full-vectorial "finite differences - variational principle" approach for the determination of the modal spectrum of photonic waveguides
Creators: name: Sumichrast, Lubomir
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: There are several methods to determine numerically modal spectrum of photonic waveguides. The problem itself can be formulated using appropriate discretisation scheme as a well-known algebraic problem of eigenvalues and eigenvectors. The difficulty consists in the large matrix dimensions which requires special approach to the determination of the eigenvalues and eigenvectors of the sparse matrices and complicates effective calculation due to immense demands on the computer memory. Recently proposed iterative method [1] modified for the use in full vectorial formulation can be efficiently employed. The feasibility of the method together with some improvements will be presented.
Where's Wally? A Machine Learning Approach
Creators: name: Barthelmes, Tobias
name: Vidal, Franck P.
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Computing methodologies
Machine learning
Applied computing
Media arts

description: Object detection has been implemented in all sorts of real-life scenarios such as facial recognition, traffic monitoring and medical imaging but the research that has gone into object detection in drawings and cartoons is not nearly as extensive. The Where's Wally puzzle books give a good opportunity to implement some of these real-life methods into the fictional world. The Wally detection framework proposed is composed of two stages: i) a Haar-cascade classifier based on the Viola-Jones framework, which detects possible candidates from a scenario from the Where'sWally books, and ii) a lightweight convolutional neural network (CNN) that re-labels the objects detected by the cascade classifier. The cascade classifier was trained on 85 positive images and 172 negative images. It was then applied to 12 test images, which produced over 400 false positives. To increase the accuracy of the models, hard negative mining was implemented. The framework achieved a recall score of 84.61% and an F1 score of 78.54%. Improvements could be made to the training data or the CNN to further increase these scores.
description: Computer Graphics and Visual Computing (CGVC)
description: Computer Vision
description: 27
description: 31
description: Tobias Barthelmes and Franck P. Vidal
description: CCS Concepts: Computing methodologies --> Machine learning; Applied computing --> Media arts
Optimisation criteria of band-pass matching networks for optical receivers in microwave optical links
Creators: name: Curti, Franco
name: Tommasino, Pasquale
name: Trifiletti, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: In this paper we present a criterion for the optimisation of tuned optical receivers which can be useful in narrow band systems applications. The design goal for the input matching network has been found by minimising the input equivalent noise current setting as a constraint a constant transimpedance gain for the overall receiver. Exact formulas for the input impedance of the matching network and the penalty for detuning are provided for a single frequency together with a finite bandwidth application case study.
Theoretical and experimental study of coupled asymmetric quantum well optical switches
Creators: name: Reale, Andrea
name: Di Carlo, A.
name: Lugli, Paolo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: We present a joined theoretical and experimental study of an optical switch based on an asymmetric double quan­tum well structure. The energy band profile for the device in the presence of the optical field has been calculated using a coupled 1-D Schrodinger-Poisson solver. The absorption spectra are then calculated and compared to the experimen­tal ones, indicating the importance of non-linear effects such as band-gap renormalization. The dynamical response of the device to a train of periodic pulses has been investigated by mean of a proper set of rate equations drawn by a quite general model including all im­portant transport phenomena.
Additional file 1 of Head movement kinematics are altered during balance stability exercises in individuals with vestibular schwannoma
Creators: name: Zobeiri, Omid A.
name: Wang, Lin
name: Millar, Jennifer L.
name: Schubert, Michael C.
name: Cullen, Kathleen E.
Publisher: name: figshare
Year: 2022
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Mental Health
subject: Hematology

description: Additional file 1. Additional Tables and Figure.
Determinanten und Prädiktoren für den klinischen Verlauf nach elektivem infrarenalem Aortenrepair
Creators: name: Bachmann, Manuel
Publisher: name: Otto-von-Guericke-Universität Magdeburg
Year: 2022
Subjects: subject: Bauchaorta
subject: Aneurysma
subject: Gefäßchirurgie
subject: 617.413

description: In dieser Arbeit wurden das postoperative Gesamt- (OS) und reinterventionsfreie (RFS) Überleben der endovaskulären (EVAR) mit der offen-chirurgischen (OR) elektiven Therapie des abdominellen Aortenaneurysmas (BAA) verglichen und Vorhersagevariablen für das Outcome ermittelt. Es wurden im Zeitraum von 2006 bis 2016 konsekutiv 116 Patienten mit OR und 209 mit EVAR eingeschlossen. Für EVAR-Patienten konnte im RFS ohne Matching ein Nachteil gegenüber OR- Patienten festgestellt werden, der sich nach Matched-Pairs-Analyse bestätigte. Die Einhaltung der anatomischen Voraussetzungen gemäß Herstellerangaben beim EVAR korrelierte nicht mit OS und RFS. Weibliches vs. männliches Geschlecht und sagittaler Abknickungswinkel >55° vs. ≤55° wiesen ein signifikant schlechteres RFS für OR und EVAR auf. Für die Indikationsstellung zur Operation und für die präoperative Planung sollten diese Faktoren gesondert berücksichtigt werden.
PHEMT device for microwave power applications based on a double delta doped heterostructure
with a stop etch layer
Creators: name: Brinciotti, A.
name: Di Maio, G.
name: Ravasi, G.
name: Bianchi, S.
name: Castelli, A.
name: Scopelliti, C.L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: In this work, we have compared the DC and RF performances of two different PHEMT devices both based on a double D doped AlGaAs/InGaAs/AlGaAs Strained Single Quantum Well , with the gate evaporated either on an AlGaAs surface or on a GaAs one. In the last case an AlAs stop etch layer was introduced in the vertical structure. The effects on the stability of the RF performances during the device RF operation when the gate evaporation was performed either on GaAs or on AlGaAs were investigated too.
The University on Lincoln Island: Reimagining a University Campus as a Role-Playing Video Game
Creators: name: Headleand, Christopher J.
name: Davies, Bethany
name: Threlfall, Danielle
name: Williams, Benjamin
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Applied computing
Education
Software and its engineering
Virtual worlds software

description: This paper presents the University of Lincoln Island (TULI), a work-in-progress project where the University of Lincoln campus has been recreated digitally and re-imagined as a fantasy role-playing computer game. Universities have had to respond to a number of key challenges in response to the COVID-19 pandemic. Moving teaching and research online has been facilitated by a number of mature software platforms and tool-sets and the institutional expertise to wield them. However, there are fewer core activities that have digital provisions, thereby requiring a more creative approach. One of these areas is campus familiarisation, traditionally managed through timetabled events such as guided tours and scavenger hunts. However, these activities will be untenable until social distancing measures are lifted, forcing us to consider alternatives. This paper presents gamified virtual environments as a digital solution to support students in this area. We identify a number of key challenges and opportunities in the hopes that it will provide insight for future work in this domain.
description: Computer Graphics and Visual Computing (CGVC)
description: Education
description: 33
description: 38
description: Christopher J. Headleand, Bethany Davies, Danielle Threlfall, and Benjamin Williams
description: CCS Concepts: Applied computing --> Education; Software and its engineering --> Virtual worlds software
Defective states in semi-insulating gallium arsenide substrates
Creators: name: Castaldini, A.
name: Cavallini, A.
name: Polenta, L.
name: Canali, C.
name: Nava, F.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: Semi-insulating gallium arsenide substrates are widely used for microwave discrete devices and integrated circuits. However, the performance of the above devices may be significantly affected by the substrate quality, i.e. crystal defects and related deep levels. Consequently, a careful characterization of substrates is mandatory to improve both device performance and production yields. In this work we have investigated gallium arsenide substrates from different suppliers and/or differently processed. To these substrates we have applied, discussed and compared different methodologies (current-voltage and capacitance-voltage characteristics as well as spectroscopic methods) to characterize the many deep levels which are either present in as-received semi-insulating substrates or induced by device processing such as ion implantation and the subsequent thermal annealing.
D1.5: 4th Report on Advisory Board meetings
Creators: name: Perperidou, Dimitra
name: Polimachi Simeonidou
name: Pavlou, Ioanna
name: Giorgos Savvidis
Publisher: name: Zenodo
Year: 2019

description: The current deliverable represents the 4th Report on the Advisory Board, the final deliverable under

this task and it presents an overview of the suggestions of the members of the advisory board as

well as the actions that were taken to address them. In total seven members were added to the

board throughout the project, in different phases, depending on their expertise. The present

document summarises the recommendations that the experts had to offer, as well as the actions that

were taken from the consortium to address them.
A GaAs Equalizer-amplifier for 1 Gbit/s data transmission on coaxial cable up to 200 meters
Creators: name: Orengo, G.
name: Giannini, F.
name: Limiti, E.
name: Cardarelli, R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: A simple amplitude equalization technique has been applied to coaxial cables to allow binary data transmission up to 1 Gbit/s in a domestic or office environment, where data link lenght is less than 200 m., and cable installation appears economically advantageous as compared to fiber optic. A new monolithic integrated equalizer-amplifier has been designed to fit to different cable types and lenghts by mean of a voltage-controlled equalization.
Parental involvement in education : a preliminary study of the lived experiences of parents in BC
Creators: name: Herrera, Lisa
Publisher: name: University of British Columbia
Year: 2014

description: Parents’ involvement in their children’s schooling (PI) has become an established norm in Western society. However, because of the way parents are pressured and positioned within the school system with traditional (TPI) and formalized (FPI) models of involvement, some proponents argue for different and deeper relationships between parents and schools with collaborative (CPI) models. In British Columbia, the current government has proposed through the introduction in 2011 of the BC Education Plan (BCED Plan), that parents in the province could in the future be working in “partnership” with teachers through individualized learning for students. Through the lens of phenomenology, the lived-experiences and beliefs about education and PI of a diverse selection of participants is explored in order to better understand what parents themselves want for their children and what they are trying to achieve through connections to teachers and schools. Conclusions and recommendations about the nature of PI discourse and the future of BCED Plan are offered.
A 0.5-30 GHz monolithic PHEMT amplifier for ESM systems applications
Creators: name: Bartocci, M.
name: Lanzieri, C.
name: Peroni, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1997
Subjects: ING-INF/01 Elettronica

description: ESM wide open receivers have need, next to antenna, to a wide bandwidth preamplifier with a low noise figure, in order to increase the sensitivity. It is also important to have a high output third order interception point to reduce the harmonics and spurious. For this reason a low noise MMIC GaAsFET Pseudomorphic HEMT amplifier has been designed and developed in collaboration with Alenia Ricerche Foundry. Based on a travelling-wave amplifier structure, this component has good performances in term of noise figure, bandwidth, return loss and output power.
Learning Activities in Colours and Rainbows for Programming Skill Development
Creators: name: Roberts, Jonathan C.
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Human centered computing
visualisation
Computing methodologies
Computer graphics
Applied computing
Distance learning

description: We present how we have created a series of bilingual (English and Welsh) STEM activities focusing on rainbows, colours, light and optical effects. The activities were motivated by the many rainbows that appeared in windows in the UK, in support of the National Health Service at the start of the coronavirus pandemic. Rainbows are hopeful and are very fitting to be used as a positive iconic image at a time of much uncertainty. In this paper we explain how we have developed and organised the activities, focusing on colours, computer graphics and computer programming. Each lesson contains one or more activities, which enable people to take an active role in their learning.We have carefully prepared and organised several processes to guide academic colleagues to create and publish different activities in the theme. Which means that the activities appear similarly structured, can be categorised and searched in a consistent way. This structure can act as a blueprint for others to follow and apply to develop their own online course. The activities incrementally take people through learning about colour, rainbows, planning what to program, design and strategies to create colourful pictures using simple computer graphics principles based in processing.org.
description: Computer Graphics and Visual Computing (CGVC)
description: Education
description: 39
description: 47
description: Jonathan C. Roberts
description: CCS Concepts: Human-centered computing --> visualisation; Computing methodologies --> Computer graphics; Applied computing --> Distance learning
Automating Visualization Quality Assessment: a Case Study in Higher Education
Creators: name: Holliman, Nicolas S.
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Human centered computing
Visualization design and evaluation methods
Empirical studies in visualization

description: We present a case study in the use of machine+human mixed intelligence for visualization quality assessment, applying automated visualization quality metrics to support the human assessment of data visualizations produced as coursework by students taking higher education courses. A set of image informatics algorithms including edge congestion, visual saliency and colour analysis generate machine analysis of student visualizations. The insight from the image informatics outputs has proved helpful for the marker in assessing the work and is also provided to the students as part of a written report on their work. Student and external reviewer comments suggest that the addition of the image informatics outputs to the standard feedback document was a positive step. We review the ethical challenges of working with assessment data and of automating assessment processes.
description: Computer Graphics and Visual Computing (CGVC)
description: Education
description: 49
description: 57
description: Nicolas S. Holliman
description: CCS Concepts: Human-centered computing --> Visualization design and evaluation methods; Empirical studies in visualization
Substitutive Arnoux-Rauzy sequences have pure discrete spectrum
Creators: name: Berthé, Valérie
name: Jolivet, Timo
name: Siegel, Anne
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We prove that the symbolic dynamical system generated by a purely substitutive Arnoux-Rauzy sequence is measurably conjugate to a toral translation. The proof is based on an explicit construction of a fundamental domain with fractal boundary (a Rauzy fractal) for this toral translation.
description: 19 pages, v2 includes some corrections to match the published version, and a mistake in the graph of Fig. 1 has been corrected
Recreational Motion Simulation: A New Frontier for Virtual Worlds Research
Creators: name: Williams, Benjamin
name: Headleand, Christopher J.
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Software and its engineering
Virtual worlds software
Computing methodologies
Modeling and simulation
General and reference
General literature

description: Motion simulation is a developing field which continues to grow with the recent incline in commercial virtual reality. Whilst the majority of motion simulation research focuses on flight simulation and training, its utility in recreational settings is often overlooked. Despite this lack of research, the use of motion simulators for recreational purposes spans decades, and is still today one of the most popular applications of motion simulator devices. Furthermore, with the recent development of low-cost motion simulation platforms, consumers have begun to use these devices in the home. Research regarding motion simulation and its effects in recreational experiences is needed now more than ever, and in this position paper we outline several reasons for its importance.
description: Computer Graphics and Visual Computing (CGVC)
description: Games and Virtual Reality
description: 59
description: 64
description: Benjamin Williams and Christopher J. Headleand
description: CCS Concepts: Software and its engineering --> Virtual worlds software; Computing methodologies --> Modeling and simulation; General and reference --> General literature
The regulation of the expression of PMCA isoforms by neuroplastin has an impact on the calcium clearance in cultured hippocampal neurons
Creators: name: Junge, Lennart
Publisher: name: Otto-von-Guericke-Universität Magdeburg
Year: 2021
Subjects: subject: Hirnfunktion
subject: Nervenzelle
subject: Calciumstoffwechsel
subject: 612.8042

description: The restoration of basal cytosolic calcium levels after excitation is essential for neurons. An important part of the machinery responsible for calcium clearance is the Plasma Membrane ATPAse (PMCA), which pumps calcium ions from the cytosol to the extracellular space with high affinity. Four PMCA paralogs are specific for distinct cell types and functions. As suggested recently, PMCAs form complexes with neuroplastin (Np) and their expression levels are affected differently by this interaction. To test the hypothesis that the ability of neuroplastin to stimulate PMCA surface expression and to increase the speed of the calcium clearance depends on the neuroplastin interaction partner TRAF6, the PMCAs were overexpressed together with neuroplastin in cell lines and neurons. The experiments showed that in COS-7 cells the overexpression of neuroplastin increased the protein level of the neuron-specific PMCA2 more than of the other PMCAs. Since neuroplastin and all PMCAs have a binding site for the signal adapter TRAF6, I tested if this protein might be relevant for their interaction. By employing a neuroplastin mutant construct missing the TRAF6 binding site I could show, that the increase of PMCA2 expression levels caused by neuroplastin in HEK cells and hippocampal neurons is TRAF6-independent. Against our expectation, in calcium imaging experiments I could show that increased PMCA levels due to overexpression of neuroplastin lead to slowing down calcium extrusion after stimulation, indicating that the influence of neuroplastin on the calcium balance is more complex. Additional factors such as the time and duration of the transfection need to be considered in order to understand the influence of the interaction of PMCA and neuroplastin on the calcium balance.
Adi's Maze and the Research Arcade: A Long-term Study on the Impact of Gendered Representation on Player Preferences
Creators: name: Headleand, Christopher J.
name: Davies, Bethany
name: Williams, Benjamin
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Social and professional topics
Gender
Software and its engineering
Interactive games

description: Gender representation in games is a much discussed topic in the field of games design. A number of papers have explored the issues around sexist, and sexualised representation, and there even evidence that the assumed gender of a character has an impact on player behaviour. We introduce Adi's maze, a simple arcade game with 4 selectable characters, with male, female, and ambiguous gendered representation. In the game, the player has to collect coins in a maze while avoiding enemy NPCs in a similar format to the popular 1980's game Pac-Man. Regardless of the selected character, the player has the same objective to complete. We installed this game on two publicly accessible arcade machines (the Research Arcade) and left them in situ for 18 months. We collected all data regarding the character selection and player behaviour and we report the results from this study. Furthermore, we report insights from the development of the research arcade, and comment on it's effectiveness as a research tool.
description: Computer Graphics and Visual Computing (CGVC)
description: Games and Virtual Reality
description: 65
description: 71
description: Christopher J. Headleand, Bethany Davies, and Benjamin Williams
description: CCS Concepts: Social and professional topics --> Gender; Software and its engineering --> Interactive games
Improving Ray Tracing Performance with Variable Rate Shading
Creators: name: Dahlin, Alexander
name: Sundstedt, Veronica
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Computing methodologies
Ray tracing

description: Hardware-accelerated ray tracing has enabled ray traced reflections for real-time applications such as games. However, the number of traced rays during each frame must be kept low to achieve expected frame rates. Therefore, techniques such as rendering the reflections at quarter resolution are used to limit the number of rays. The recent hardware features inline ray tracing, and variable rate shading (VRS) could be combined to limit the number of rays even further. This research aims to use hardware VRS to limit the number of rays while maintaining the visual quality in the final rendered image. An experiment with performance tests is performed on a rendering pipeline using different techniques to generate rays. The techniques use inline ray tracing combined with VRS and ray generation shaders. These are compared and evaluated using performance tests and the image evaluator FLIP. The results show that limiting the number of rays with hardware VRS leads to improved performance while the difference in visual quality remains comparable.
description: Computer Graphics and Visual Computing (CGVC)
description: Computer Graphics
description: 73
description: 77
description: Alexander Dahlin and Veronica Sundstedt
description: CCS Concepts: Computing methodologies --> Ray tracing
Jones polynomials, volume, and essential knot surfaces: a survey
Creators: name: Futer, David
name: Kalfagianni, Efstratia
name: Purcell, Jessica S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27, 57M50

description: This paper is a brief overview of recent results by the authors relating colored Jones polynomials to geometric topology. The proofs of these results appear in the papers [arXiv:1002.0256] and [arXiv:1108.3370], while this survey focuses on the main ideas and examples.
description: 27 pages, 23 figures. v2 contains minor revisions and updated references. To appear in Proceedings of Knots in Poland III
RECCS: Real-Time Camera Control for Particle Systems
Creators: name: Köster, Marcel
name: Groß, Julian
name: Krüger, Antonio
Publisher: name: The Eurographics Association
Year: 2021
Subjects: Human centered computing
Visualization systems and tools
Scientific visualization
Interaction techniques
Computing methodologies
Shared memory algorithms
Massively parallel algorithms
Graphics processors

description: Interactive exploration and analysis of large 3D particle systems, consisting of hundreds of thousands of particles, are common tasks in the field of scientific and information visualization. These steps typically involve selection and camera-update operations in order to reveal patterns or to focus on subsets. Moreover, if a certain region is known to be potentially interesting or a selection has been made, the user will have to choose a proper camera setup to investigate further. However, such a setup is typically chosen in a way that the interesting region is in the center of the screen. Unfortunately, it still needs to show important characteristics of the selected subset and has the least amount of occlusions with respect to other particles but shows enough context information in terms of non-selected particles. In this paper, we propose a novel method for real-time camera control in 3D particle systems that fulfills these requirements. It is based on a user and/or domain-specific evaluation heuristic and parallel optimization algorithm that is designed for Graphics-Processing Units (GPUs). In addition, our approach takes only several milliseconds to complete, even on the aforementioned large datasets while consuming only a few megabytes in global GPU memory in general. This is due the fact that we are able to reduce the processing complexity significantly using screenspace information and the excessive use of fast on-chip shared memory. This allows it to be seamlessly integrated into modern visualization systems that need real-time feedback while processing large particle-based datasets.
description: Computer Graphics and Visual Computing (CGVC)
description: Computer Graphics
description: 79
description: 87
description: Marcel Köster, Julian Groß, and Antonio Krüger
description: CCS Concepts: Human-centered computing --> Visualization systems and tools; Scientific visualization; Interaction techniques; Computing methodologies --> Shared memory algorithms; Massively parallel algorithms; Graphics processors
title: WoSIS Procedures Manual 2020
Creators: name: Batjes, Niels
name: Ribeiro, Eloi
name: van Oostrum, Ad
Publisher: name: ISRIC - World Soil Information
Year: 2020

description: The '2020 Procedures Manual' describes the workflows for handling, quality-assessing and standardising soil profile data in ISRIC's  World Soil Information Service (WoSIS).  It supercedes the preceding version published in 2018.