bluuebunny/crossref_metadata_2025_split huggingface dataset:
Adaptive multiple model control for nonlinear constrained systems with a novel barrier Lyapunov function
Authors: Zhang Yanqi , Wang Xin , Wang Zhenlei 
Published: April 2023

AbstractThis paper investigates the problem of the multiple model control of nonlinear full state constrained systems with a novel barrier Lyapunov function. To handle the problem of unknown parameters, the identification model set containing identification models is established. The novel barrier Lyapunov functions (BLFs) are employed to guarantee that all system states do not violate their boundaries and can remove the restricted condition associated with traditional BLFs. By using the first order filter technique, the "explosion of complexity" difficulty caused by the repeated differential from the backstepping technique is removed. In addition, the estimation of unknown parameters is obtained by using the convex hull property. Based on the second level adaptation technique, the convex hull parameters are designed by using the identification error dynamics, and this algorithm has better convergence property than other algorithms. Then, a multiple model control strategy is developed, which not only guarantees that the requirement of all state constraints is realized, but also ensures that the boundedness of all signals of closed‐loop systems are not violated. The key advantage is that the proposed strategy does not require enormous identification models, that is, the number of identification model is reduced significantly. Finally, the effectiveness of the presented scheme is illustrated through the simulation results.
Electrodynamics and rational thermodynamics
Authors: Müller Ingo , Müller Wolfgang H. 
Published: April 2023

AbstractThe electromagnetic fields (D, H) represent contravariant components of an antisymmetric 4‐tensor, while the fields (E, B) represent covariant components of the same 4‐tensor. Both sets are identical in Lorentz frames. The governing equations for them represent equations of balance for the flux of D and the flux B across open surfaces and they are invariant under arbitrary analytic transformation of space and time. This convenient property has motivated mechanicians to reformulate mechanics and thermodynamics in terms of the symmetric 4‐tensor of energy‐momentum so as to exhibit, perhaps, the same invariance as electromagnetism: general relativity. The interpretation of electromagnetism in terms of fields carries the theory a long way. But it breaks down when absorption and emission of radiation by bodies is concerned. In this case the proper view is that of a photon gas.Also the elegant union of electromagnetism and thermodynamics meets practical difficulties for bodies with internal structure, like electric and magnetic dipoles or for mixtures of charged constituents. The description of such bodies is limited to velocities much smaller than that of light. Still in those bodies the entropy inequality implies severe and interesting restrictions on the dependence of material properties on the electromagnetic fields. It will be evaluated by using the Lagrange multiplier method.In the early days of electromagnetism there was much confusion among physicists and engineers about the different formulation of the fields and about proper dimensions and units. This dilemma is also briefly explained in the article.
Creativity and Virtual Worlds
Authors: Liggett Susan 
Published: April 2023

AbstractThe relationship between the real world and the internet is explored. The real and the virtual are separate but intersecting and overlapping worlds as far as audiences are concerned. What is the effect of a work created on the internet on the real world, and vice-versa? The rise of the internet and its effect on creativity is examined. Technology has changed the production and distribution of artworks to audiences. Repositories such as art galleries and museums can exist as virtual entities and enable audiences to view, and interact with, artifacts and artworks. Such repositories can change the ways in which audiences view and perceive artworks.
Art Thinking and Design Thinking
Authors: Townsley Jill 
Published: April 2023

AbstractA broader spectrum of creative practice is considered more closely, distinguishing between art and design as different entities within the creative tradition. Drawing distinctions between these two forms, could help us understand creativity with more breadth. Creativity may be classified across two domains in the visual arts, art thinking and design thinking. This distinction has a long tradition, however, research outside of practice-based analysis has introduced it as a multidisciplinary tool. Art thinking has in this way expanded beyond art practice and is applied as a general method for observing and utilizing patterns, in all types of creative activities.
Time and Temporality: Creative Reception and Repetition
Authors: Townsley Jill 
Published: April 2023

AbstractSpoons is a sculpture that holds contextual reference through its relation to time. Temporality is made visible as the sculpture randomly collapses in the gallery space over a period of time. It looks at the way time and temporality interact with creativity to bring meaning to an artwork. A proposition is made that meaning is constructed through a process of relational connection between the artwork and the viewer. Communication and meaning are contingent on an ever-changing interaction between origin and reception. This is a creative act, and as such meaning is creative and contingent on the time and the temporality of the moment of encounter. However, moments are always changing, so, meaning is always changing too, as time alters our socially agreed cultural contexts, interests, and concerns. The proposition is that through art thinking, creativity becomes a social event, constructed between origin and reception, fluid and relationally positioned in time and space through repetition. The case study reveals that meaning can be creative and transient, as opposed to specific or fixed, and that these creative constructs depend on time, culturally agreed contexts, and relational conditions. Consideration is also given to how the digital space can disrupt our understanding of time and temporality, as it traverses the analog and digital worlds.
Die Gruppendiskussion – Bilder über Bilder
Authors: Bührig-Hollmann Annette 
Published: April 2023

ZusammenfassungNachdem bisher aus unterschiedlichen Perspektiven auf die UNB als wesentlichem Ausbildungselement der Referendarausbildung geblickt wurde, kommt hier als eine weitere Datenquelle eine Gruppe von Referendar:innen zu Wort. Ziel dieses erneuten Zugangs ist es, eine größere Bandbreite von Auszubildenden mit unterschiedlichen Unterrichtsfächer und damit auch unterschiedlichen Fachleitungen zu berücksichtigen. Die Daten wurden während einer Gruppendiskussion im Kernseminar erhoben. Das Verfahren der Datenanalyse stützt sich bei diesem Zugang auf die Systematisierung und Auswertung der von den LAA verwendeten Metaphern, die sich innerhalb der Diskussion als ein kohärentes System beschreiben lassen. Als Ergebnis kann ein komplexes Verständnis der erkenntnisleitenden Vorstellungen der Referendar:innen zu ihrer Ausbildung gewonnen werden.
Forschungsdesign und methodologische Entscheidungen
Authors: Bührig-Hollmann Annette 
Published: April 2023

ZusammenfassungIn dieser Arbeit werden unter Berücksichtigung der involvierten Kommunikationsinstanzen unterschiedliche empirische Zugänge zum Feld gewählt. Die Datenanalyse der ministeriellen Vorgaben und institutionellen Ausbildungskonzepte bilden einen Zugang zum Verständnis der Ausbildung. Ein weiterer ist die Kommunikationsanalyse der Beratung selbst und wie diese in der Nachschau (Nachträglich lautes Denken ) von der beteiligten Referendarin wahrgenommen wird. Die Analyse der in einer Gruppendiskussion von Referendar:innen verwendeten Metaphern erweitert die Perspektive der Auszubildenden. Die Berücksichtigung unterschiedlicher methodischer Verfahren soll dabei nicht verstanden werden als eine Ausschärfung des Datenmaterials im Sinne einer Validierung der erzielten Ergebnisse. Es soll vielmehr untersucht werden, wie sich die Kommunikationsweisen der drei Instanzen zueinander verhalten.
Die Rekonstruktion einer UNB – der 2. UB von Frau Henke
Authors: Bührig-Hollmann Annette 
Published: April 2023

ZusammenfassungBei der aufgezeichneten Unterrichtsnachbesprechung (UNB) handelt es sich um den zweiten Unterrichtsbesuch (UB) im Fach Deutsch der Referendarin Frau Henke. Die Analyse der Gesprächsausschnitte gliedert sich anhand dreier heuristischer Fragen: Was wird dargestellt? Wie wird es dargestellt und wieso wird es so dargestellt?
Die Sicht der Referendarin
Authors: Bührig-Hollmann Annette 
Published: April 2023

ZusammenfassungMit der Methode des "Nachträglich Lauten Denkens" (NLD) wird innerhalb dieser Untersuchung die Sicht der Referendarin auf die UNB ermöglicht. Dabei ist von besonderem Interesse, inwiefern die Positionierungen, wie sie während der Beratung getätigt wurden, hier erkannt und ggf. kommentiert werden.
Interactions of particles with “continuous spin” fields
Authors: Schuster Philip , Toro Natalia , Zhou Kevin 
Published: April 2023

Abstract
Powerful general arguments allow only a few families of long-range interactions, exemplified by gauge field theories of electromagnetism and gravity. However, all of these arguments presuppose that massless fields have zero spin scale (Casimir invariant) and hence exactly boost invariant helicity. This misses the most general behavior compatible with Lorentz symmetry. We present a Lagrangian formalism describing interactions of matter particles with bosonic “continuous spin” fields with arbitrary spin scale ρ. Remarkably, physical observables are well approximated by familiar theories at frequencies larger than ρ, with calculable deviations at low frequencies and long distances. For example, we predict specific ρ-dependent modifications to the Lorentz force law and the Larmor formula, which lay the foundation for experimental tests of the photon’s spin scale. We also reproduce known soft radiation emission amplitudes for nonzero ρ. The particles’ effective matter currents are not fully localized to their worldlines when ρ ≠ 0, which motivates investigation of manifestly local completions of our theory. Our results also motivate the development of continuous spin analogues of gravity and non-Abelian gauge theories. Given the correspondence with familiar gauge theory in the small ρ limit, we conjecture that continuous spin particles may in fact mediate known long-range forces, with testable consequences.
Additive Diophantine Equations with Binary Recurrences, $${{\mathcal {S}}}$$-Units and Several Factorials
Authors: Bérczes Attila , Hajdu Lajos , Luca Florian , Pink István 
Published: April 2023

AbstractThere are many results in the literature concerning linear combinations of factorials among terms of linear recurrence sequences. Recently, Grossman and Luca provided effective bounds for such terms of binary recurrence sequences. In this paper we show that under certain conditions, even the greatest prime divisor of$$u_n-a_1m_1!-\dots -a_km_k!$$un-a1m1!-⋯-akmk!tends to infinity, in an effective way. We give some applications of this result, as well.
Comparison of a novel self-expanding transcatheter heart valve with two established devices for treatment of degenerated surgical aortic bioprostheses
Authors: Nikolayevska Olga , Conradi Lenard , Schirmer Johannes , Reichenspurner Hermann , Deuschl Florian , Blankenberg Stefan , Schäfer Ulrich 
Published: April 2023

Abstract
Aims
This study was performed to compare haemodynamic properties of a novel transcatheter heart valve (THV) with two established valve technologies for treatment of failing surgical aortic bioprosthetic valves (SAV). The ALLEGRA THV has been recently described with a proven safety and performance profile.

Methods and results
The study was designed as a retrospective, single-centre study investigating 112 patients (77.7 ± 7.1 years, 53.8% female, STS score 6.8 ± 5.8% and logEuroSCORE I 27.4 ± 16.1%) with failing SAV. Patients were treated with the ALLEGRA THV (NVT, n = 24), the CoreValve/EvolutR (MTD, n = 64) or the Edwards Sapien/Sapien XT/Sapien 3 (EDW, n = 24). Adverse events, haemodynamic outcomes and patient safety were analysed according to VARC-3 definitions. Overall procedural success was high (94.6%), even though 58.9% of the treated SAV were classified as small (true inner diameter < 21 mm). After treatment, the mean pressure gradient was significantly reduced (baseline: 33.7 ± 16.5 mmHg, discharge: 18.0 ± 7.1 mmHg), with a corresponding increase in effective orifice area (EOA). The complication rates did not differ in between groups. There was a trend to lower mean transvalvular gradients after implantation of self-expanding THV with supra-annular valve function, despite a higher frequency of smaller SAVs in the NVT and MTD group. Additionally, comparison between NVT and MTD revealed statistically lower transvalvular gradients (NVT 14.9 ± 5.0 mmHg, MTD 18.7 ± 7.5 mmHg, p = 0.0295) in a subgroup analysis.

Conclusions
Valve-in-valve (ViV) treatment of failing SAV with supra-annular design like the ALLEGRA THV resulted in favourable haemodynamic outcomes with similar low clinical event rates and may therefore be an interesting alternative for VIV TAVI.

Graphical abstract
Prioritize rapidly scalable methane reductions in efforts to mitigate climate change
Authors: Dunn Jennifer B. , Salas Santiago D. , Chen Qining , Allen David T. 
Published: April 2023

AbstractMethane emission reductions are crucial for addressing climate change. It offers short-term benefits as it holds high short-term reductions in radiative forcing. Efforts towards the reduction of methane emissions are already underway. In this study, we compared and analyzed the mitigation benefits of cutting large amounts of methane emissions from the oil and gas sector on short-time scales with reducing an equivalent amount of carbon dioxide using carbon capture and storage (CCS). Characteristics of CCS are that it would require substantial infrastructure development and that it incorporates deployment delays. Results illustrate that prioritizing quickly deployable methane emission reduction alternatives that necessitate minimal construction is an efficient approach to achieve near-term climate change relief.
Graphical abstract
Multi-feed, loop-dipole combined dielectric resonator antenna arrays for human brain MRI at 7 T
Authors: Wenz Daniel , Dardano Thomas 
Published: April 2023

Abstract
Objective
To determine whether a multi-feed, loop-dipole combined approach can be used to improve performance of rectangular dielectric resonator antenna (DRA) arrays human brain for MRI at 7 T.

Materials and methods
Electromagnetic field simulations in a spherical phantom and human voxel model “Duke” were conducted for different rectangular DRA geometries and dielectric constants εr. Three types of RF feed were investigated: loop-only, dipole-only and loop-dipole. Additionally, multi-channel array configurations up to 24-channels were simulated.

Results
The loop-only coupling scheme provided the highest B1+ and SAR efficiency, while the loop-dipole showed the highest SNR in the center of a spherical phantom for both single- and multi-channel configurations. For Duke, 16-channel arrays outperformed an 8-channel bow-tie array with greater B1+ efficiency (1.48- to 1.54-fold), SAR efficiency (1.03- to 1.23-fold) and SNR (1.63- to 1.78). The multi-feed, loop-dipole combined approach enabled the number of channels increase to 24 with 3 channels per block.

Discussion
This work provides novel insights into the rectangular DRA design for high field MRI and shows that the loop-only feed should be used instead of the dipole-only in transmit mode to achieve the highest B1+ and SAR efficiency, while the loop-dipole should be the best suited in receive mode to obtain the highest SNR in spherical samples of similar size and electrical properties as the human head.
Expansion and collapse of VEGF diversity in major clades of the animal kingdom
Authors: Rauniyar Khushbu , Bokharaie Honey , Jeltsch Michael 
Published: April 2023

AbstractTogether with the platelet-derived growth factors (PDGFs), the vascular endothelial growth factors (VEGFs) form the PDGF/VEGF subgroup among cystine knot growth factors. The evolutionary relationships within this subgroup have not been examined thoroughly to date. Here, we comprehensively analyze the PDGF/VEGF growth factors throughout all animal phyla and propose a phylogenetic tree. Vertebrate whole-genome duplications play a role in expanding PDGF/VEGF diversity, but several limited duplications are necessary to account for the temporal pattern of emergence. The phylogenetically oldest PDGF/VEGF-like growth factor likely featured a C-terminus with a BR3P signature, a hallmark of the modern-day lymphangiogenic growth factors VEGF-C and VEGF-D. Some younger VEGF genes, such as VEGFB and PGF, appeared completely absent in important vertebrate clades such as birds and amphibia, respectively. In contrast, individual PDGF/VEGF gene duplications frequently occurred in fish on top of the known fish-specific whole-genome duplications. The lack of precise counterparts for human genes poses limitations but also offers opportunities for research using organisms that diverge considerably from humans.
Graphical abstract
Sources for the graphical abstract: 326 MYA and older [1]; 72–240 MYA [2]; 235–65 MYA [3]
Analyses of Spatial Correlation and Coherence in ABL Flow with a Fleet of UAS
Authors: Wetz Tamino , Zink Josef , Bange Jens , Wildmann Norman 
Published: April 2023

AbstractThe spatial structures of turbulent flow in the atmospheric boundary layer (ABL) are complex and diverse. Multi-point spatial correlation measurements can help improve our understanding of these structures and their statistics. In this context, we investigate Taylor’s hypothesis and the statistics of spatial structures on the microscale. For the first time, simultaneous horizontally distributed wind measurements with a fleet of 20 quadrotor UAS (unmanned aerial systems) are realized. The measurements were taken at different heights and under different atmospheric conditions at the boundary layer field site in Falkenberg of the German Meteorological Service (DWD). A horizontal flight pattern has been specifically developed, consisting of measurements distributed along and lateral to the mean flow direction with separation distances of $$5\ldots 205$$

5
…
205

m. The validity of Taylor’s hypothesis is studied by examining the cross-correlations of longitudinally distributed UAS and comparing them with the autocorrelations of single UAS. To assess the similarity of flow structures on different scales, the lateral and longitudinal coherence of the streamwise velocity component is examined. Two modeling approaches for the decay of coherence are compared. The experimental results are in good agreement with the model approaches for neutral atmospheric conditions, whereas in stable and convective ABL, the exponential approaches are not unconditionally valid. The validation results and the agreement with the literature on coherence in the ABL underline the potential of the UAS fleet for the purpose of spatial turbulence measurements.
Topic modelling the mobility response to heat and drought
Authors: Zander Kerstin K. , Baggen Hunter S. , Garnett Stephen T. 
Published: April 2023

AbstractWe conducted a systematic literature review of peer-reviewed full text articles on the nexus between human mobility and drought or heat published between 2001 and 2021, inclusive. We identified 387 relevant articles, all of which were analysed descriptively using a dictionary-based approach and by using an unsupervised machine learning–based Latent Dirichlet Allocation (LDA) model. Most articles were in response to droughts (71%), but heat and extreme temperature became more prominent after 2015. The drought-related literature focuses geographically on African and Southern Asian countries, while heat-related research has mainly been conducted in developed countries (mostly in the USA and Australia). For both hazards, European countries are under-represented. The LDA model identified 46 topics which were clustered into five major themes. One cluster (14% of all articles) included literature on heat-related mobility, mostly data-driven models, including amenity migration. The other four clusters included literature on drought, primarily on farming societies and the agricultural sector with three of those clusters making up 63% of all articles, with the common overarching focus on climate migration and food security. One of the four drought clusters focused on social dysfunction in relation to droughts. A sentiment analysis showed articles focusing on voluntary mobility as part of adaptation to drought and heat were more positive than articles focusing on migration triggered by droughts and heat. Based on the topics and the article characterisation, we identified various research gaps, including migration in relation to urban droughts, heat in farming societies and in urban societies of developing countries, planned retreat from hot to cooler places, and the inability or barriers to doing so. More research is also needed to understand the compound effect of drought and heat, and the social and psychological processes that lead to a mobility decision.
Implementation of a hepatitis-themed virtual escape room in pharmacy education: A pilot study
Authors: Krishnan Sunanthiny , Blebil Ali Qais , Dujaili Juman Abdulelah , Chuang Sara , Lim Angelina 
Published: April 2023

AbstractAs we enter a world of blended learning in higher education, an increased need for adaptation of teaching strategies to enhance engagement has been recognised to amplify learning outcomes online. Gamification has been identified as a creative tool to engage the current cohort of learners who are also characteristically tech-savvy. To this end, escape room games have gained considerable traction in medical and pharmacy education to promote learning, critical thinking and teamwork. In this pilot study we describe the implementation of a 60-minute, web-based hepatitis-themed escape room game within a Year 3 Pharmacotherapy unit at Monash University. A total of 418 students participated in this activity. Students’ knowledge gain on the topic was assessed through a pre- and post-intervention assessment, whereby a statistically significant improvement was seen in the knowledge score following implementation of the gaming activity (58.66% pre-intervention vs. 72.05% post-intervention, p < 0.05). The innovative learning activity was also well perceived by the students. Virtual escape room game is a viable pedagogical approach to teach and reinforce clinical concepts among pharmacy students. With the evolving landscape of education and learner demographics, investment in technology- enhanced game-based learning is a promising trajectory to support students’ growth in a learner-centered environment. A comparison between virtual escape room game and traditional teaching will further inform effectiveness of the gamification on long term knowledge retention.