cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ray tracing Einstein-Æther black holes: Universal versus Killing horizons
Creators: name: Cropp, Bethan
name: Liberati, Stefano
name: Mohd, Arif
name: Visser, Matt
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Violating Lorentz-invariance, and so implicitly permitting some form of superluminal communication, necessarily alters the notion of a black hole. Nevertheless, in both Einstein-Æther gravity, and Hořava-Lifshitz gravity, there is still a causally disconnected region in black-hole solutions; now being bounded by a "Universal horizon", which traps excitations of arbitrarily high velocities. To better understand the nature of these black holes, and their Universal horizons, we study ray trajectories in these spacetimes. We find evidence that Hawking radiation is associated with the Universal horizon, while the "lingering" of ray trajectories near the Killing horizon hints at reprocessing there. In doing this we solve an apparent discrepancy between the surface gravity of the Universal horizon and the associated temperature derived by tunneling method. These results advance the understanding of these exotic horizons, and provide hints for a full understanding of black-hole thermodynamics in Lorentz-violating theories.
description: v1: 26 pages, 6 figures; v2: now 28 pages. This version accepted for publication in Physical Review D
title: Reading Kafka & Beckett in the light of irony
Creators: name: Kalinowski, Gregor McIver
Publisher: name: University of Kent
Year: 2022

description: My thesis has a double-focus: what began as a comparative study of Kafka and Beckett as ironists, became increasingly diverted with the subject of irony itself. This development led to a theoretical engagement from which I emerged with a clearer sense of what I had always presumed, that dealing with irony involves a range of hermeneutic problems akin to problems encountered reading Kafka and Beckett. What I had not anticipated was the extent to which irony solicits this engagement. These mutually informing hermeneutic concerns assist in the tracing out and extending of pre-existing comparative commentary on Kafka and Beckett. Perhaps inevitably, given the well-known links between Kafka and Kierkegaard, my companion text in irony is Kierkegaard’s thesis 'The Concept of Irony'. The link to Kafka should not detract from the fact that Kierkegaard necessarily pops up in any serious reading in irony. Through Kierkegaard I became acquainted with some of Kierkegaard’s more recent readers — of particular mention here is Sylviane Agacinski’s reading (in Aparté: Conceptions and Deaths o f Soren Kierkegaard) of The Concept o f Irony in the light of late twentieth-century theoretical developments. It was through Agacinski that I found I was not bound to decide between the various views of irony encountered in my reading, but that these constituted a spectrum or filter of points of view corresponding to a movement in irony itself. Thus conceived, irony provides the means for telling Kafka and Beckett apart in a differential filter of readings. More than this, however, this movement only ever marks the beginning of irony’s movement, yet participates in the promise of a further movement. This preserves that priceless, albeit risky, nub of not reading which lies at irony’s source, and the questionable advantage of not theorizing too systematically about Kafka and Beckett — which inevitably remains, folly or not, an essential factor behind the choice of irony in the first place.
On the infinite Lucchesi–Younger conjecture I
Creators: name: Gollin, J. Pascal
name: Heuer, Karl
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 510 Mathematik
subject: directed cuts
subject: (finitary) dijoin
subject: infinite digraphs
subject: infinite Lucchesi–Younger conjecture
subject: optimal pair

description: A dicut in a directed graph is a cut for which all of its edges are directed to a common side of the cut. A famous theorem of Lucchesi and Younger states that in every finite digraph the least size of an edge set meeting every dicut equals the maximum number of disjoint dicuts in that digraph. In this first paper out of a series of two papers, we conjecture a version of this theorem using a more structural description of this min‐max property for finite dicuts in infinite digraphs. We show that this conjecture can be reduced to countable digraphs where the underlying undirected graph is 2‐connected, and we prove several special cases of the conjecture.
Impacts of COVID-19 Pandemic on National Security Issues: Indonesia as a Case Study
Creators: name: Alam, Md. Mahmudul
Publisher: name: figshare
Year: 2023
Subjects: Welfare, insurance, disability and social security law
Public economics - taxation and revenue

description: The national security issues in particular non-traditional security issues such as law enforcement, health, food, supply chain management, industry etc. are severely impacted by the COVID-19 outbreak in all countries of the world. As such, the developing country like Indonesia has largely been suffering from this epidemic. In this context, this paper attempts to analyse some national security issues that are affecting Indonesia, which is currently struggling with the COVID-19 pandemic. Proposed here are policy measures to combat both present and future challenges. The study uses secondary data collected from different sources concerning COVID-19 pandemic and security issues of Indonesia. The study analyses the data based on descriptive statistics, highlighting the impact of the COVID-19 pandemic on Indonesian law enforcement issues, and security of health, food, supply chain management, industrial and other economic sectors. The study argues that if the vulnerability continues in these security-related issues due to pandemic, the country will face a harsh reality to manage the state-affairs. Therefore, the policy options are mainly concerned with the COVID-19 issue. Indonesia’s government should identify what measures to take by conducting rapid diagnostics (RPD) and polymerase chain reaction (PCR) tests in the laboratory, respectively. Moreover, the government and relevant stakeholders need to develop strategies that break the stranglehold of COVID-19 transmission in order to resolve Indonesian national security concern.
Evolving Highly Active Oxidic Iron(III) Phase from Corrosion of Intermetallic Iron Silicide to Master Efficient Electrocatalytic Water Oxidation and Selective Oxygenation of 5‐Hydroxymethylfurfural
Creators: name: Hausmann, J. Niklas
name: Beltrán‐Suito, Rodrigo
name: Mebs, Stefan
name: Hlukhyy, Viktor
name: Fässler, Thomas F.
name: Dau, Holger
name: Driess, Matthias
name: Menezes, Prashanth W.
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: alkaline oxygen evolution reaction
subject: intermetallic compounds
subject: iron
subject: selective oxygenation of organics
subject: silicon
subject: water oxidation

description: In a green energy economy, electrocatalysis is essential for chemical energy conversion and to produce value added chemicals from regenerative resources. To be widely applicable, an electrocatalyst should comprise the Earth's crust's most abundant elements. The most abundant 3d metal, iron, with its multiple accessible redox states has been manifold applied in chemocatalytic processes. However, due to the low conductivity of FeIIIOxHy phases, its applicability for targeted electrocatalytic oxidation reactions such as water oxidation is still limited. Herein, it is shown that iron incorporated in conductive intermetallic iron silicide (FeSi) can be employed to meet this challenge. In contrast to silicon‐poor iron–silicon alloys, intermetallic FeSi possesses an ordered structure with a peculiar bonding situation including covalent and ionic contributions together with conducting electrons. Using in situ X‐ray absorption and Raman spectroscopy, it could be demonstrated that, under the applied corrosive alkaline conditions, the FeSi partly forms a unique, oxidic iron(III) phase consisting of edge and corner sharing [FeO6] octahedra together with oxidized silicon species. This phase is capable of driving the oxyge evolution reaction (OER) at high efficiency under ambient and industrially relevant conditions (500 mA cm−2 at 1.50 ± 0.025 VRHE and 65 °C) and to selectively oxygenate 5‐hydroxymethylfurfural (HMF).
The Lagrangian Formulation of Strong-Field QED in a Plasma
Creators: name: Raicher, Erez
name: Eliezer, Shalom
name: Zigler, Arie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The Lagrangian formulation of the scalar and spinor quantum electrodynamics (QED) in the presence of strong laser fields in a plasma medium is considered. We include the plasma influence in the free Lagrangian analogously to the "Furry picture" and obtain coupled equations of motion for the plasma particles and for the laser propagation. We demonstrate that the strong-field wave (i.e. the laser) satisfies a massive dispersion relation and obtain self-consistently the effective mass of the laser photons. The Lagrangian formulation derived in this paper is the basis for the cross sections calculation of quantum processes taking place in the presence of a plasma.
The Vainshtein Mechanism in the Cosmic Web
Creators: name: Falck, Bridget
name: Koyama, Kazuya
name: Zhao, Gong-bo
name: Li, Baojiu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the dependence of the Vainshtein screening mechanism on the cosmic web morphology of both dark matter particles and halos as determined by ORIGAMI. Unlike chameleon and symmetron screening, which come into effect in regions of high density, Vainshtein screening instead depends on the dimensionality of the system, and screened bodies can still feel external fields. ORIGAMI is well-suited to this problem because it defines morphologies according to the dimensionality of the collapsing structure and does not depend on a smoothing scale or density threshold parameter. We find that halo particles are screened while filament, wall, and void particles are unscreened, and this is independent of the particle density. However, after separating halos according to their large scale morphological environment, we find no difference in the screening properties of halos in filaments versus halos in clusters. We find that the fifth force enhancement of dark matter particles in halos is greatest well outside the virial radius. We confirm the theoretical expectation that even if the internal field is suppressed by the Vainshtein mechanism, the object still feels the fifth force generated by the external fields, by measuring peculiar velocities and velocity dispersions of halos. Finally, we investigate the morphology and gravity model dependence of halo spins, concentrations, and shapes.
description: 21 pages, 14 figures, matches version accepted to JCAP; ORIGAMI code available at http://icg.port.ac.uk/~falckb
title: Effects of Hemizygia welwitschii leaf extract fractions on postharvest infestation of maize by Sitophilus zeamais Motsculsky (Coleoptera: Curculionidae)
Creators: name: Nukenine, Elias Nchiwan
name: Saidou, Clement
name: Tagne, Gabriel Fotso
name: Tofel, Haman Katamssadan
name: Zoumba, Calvin
name: Böttcher, Christoph
name: Adler, Cornel
Publisher: name: Julius Kühn-Institut
Year: 2018

description: As part of on-going efforts to use eco-friendly alternatives to chemical pesticides, leaf powder of Hemizygia welwitschii was sequentially extracted in hexane, acetone and methanol. Bioassays were carried out to establish the most active fraction(s) against Sitophilus zeamais in maize. Maize grains (50 g) were treated with concentrations within the range 2, 4, 6, and 10 g/kg of extract and Azadirachta indica seed oil (positive control) in the laboratory. The total number of progeny emerging from grains infested separately with S. zeamais eggs, larvae and pupae were recorded. Adult mortality counts were carried out 1, 3, 7 and 14 d post-exposure. Acetone extract was more toxic to the eggs, larvae and pupae than the other extracts, inhibiting progeny production by 90.90%, 88.10% and 100%, respectively, at the concentration 10 g/kg. For the same concentration, A. indica seed oil reduced progeny production by 100% for eggs, 96.08% for larvae and 70.93% for pupae. Hexane extract was more potent to the adult weevil than the other extracts, recording 100% mortality for the concentration 10 g/kg within 14 d. LC50 values were 0.78 (Hexane), 5.52 (acetone) and 1.69 g/kg (methanol). Extracts of H. welwitschii leaves had sufficient efficacy to be a component of storage pest management package for S. zeamais.
description: Julius-Kühn-Archiv, Nr. 463, Vol. 2 (2018): Proceedings of the 12th International Working Conference on Stored Product Protection (IWCSPP) in Berlin, Germany, October 7-11, 2018
Single‐trial regression of spatial exploration behavior indicates posterior EEG alpha modulation to reflect egocentric coding
Creators: name: Gehrke, Lukas
name: Gramann, Klaus
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 610 Medizin und Gesundheit
subject: electroencephalogram
subject: mobile brain/body imaging
subject: single‐trial regression
subject: spatial cognition
subject: virtual reality

description: Learning to navigate uncharted terrain is a key cognitive ability that emerges as a deeply embodied process, with eye movements and locomotion proving most useful to sample the environment. We studied healthy human participants during active spatial learning of room‐scale virtual reality (VR) mazes. In the invisible maze task, participants wearing a wireless electroencephalography (EEG) headset were free to explore their surroundings, only given the objective to build and foster a mental spatial representation of their environment. Spatial uncertainty was resolved by touching otherwise invisible walls that were briefly rendered visible inside VR, similar to finding your way in the dark. We showcase the capabilities of mobile brain/body imaging using VR, demonstrating several analysis approaches based on general linear models (GLMs) to reveal behavior‐dependent brain dynamics. Confirming spatial learning via drawn sketch maps, we employed motion capture to image spatial exploration behavior describing a shift from initial exploration to subsequent exploitation of the mental representation. Using independent component analysis, the current work specifically targeted oscillations in response to wall touches reflecting isolated spatial learning events arising in deep posterior EEG sources located in the retrosplenial complex. Single‐trial regression identified significant modulation of alpha oscillations by the immediate, egocentric, exploration behavior. When encountering novel walls, as well as with increasing walking distance between subsequent touches when encountering novel walls, alpha power decreased. We conclude that these oscillations play a prominent role during egocentric evidencing of allocentric spatial hypotheses.
A monolithic multi-time-step computational framework for first-order transient systems with disparate scales
Creators: name: Karimi, S.
name: Nakshatrala, K. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Developing robust simulation tools for problems involving multiple mathematical scales has been a subject of great interest in computational mathematics and engineering. A desirable feature to have in a numerical formulation for multiscale transient problems is to be able to employ different time-steps (multi-time-step coupling), and different time integrators and different numerical formulations (mixed methods) in different regions of the computational domain. We present two new monolithic multi-time-step mixed coupling methods for first-order transient systems. We shall employ unsteady advection-diffusion-reaction equation with linear decay as the model problem, which offers several unique challenges in terms of non-self-adjoint spatial operator and rich features in the solutions. We shall employ the dual Schur domain decomposition technique to handle the decomposition of domain into subdomains. Two different methods of enforcing compatibility along the subdomain interface will be used in the time discrete setting. A systematic theoretical analysis (which includes numerical stability, influence of perturbations, bounds on drift along the subdomain interface) will be performed. The first coupling method ensures that there is no drift along the subdomain interface but does not facilitate explicit/implicit coupling. The second coupling method allows explicit/implicit coupling with controlled (but non-zero) drift in the solution along the subdomain interface. Several canonical problems will be solved to numerically verify the theoretical predictions, and to illustrate the overall performance of the proposed coupling methods. Finally, we shall illustrate the robustness of the proposed coupling methods using a multi-time-step transient simulation of a fast bimolecular advective-diffusive-reactive system.
2018-Weber_Theers_Surmann_Ligges_Weihs-Sensitivity Analysis_of_Ordinary_Differential_Equation_Models
Creators: name: Weber, Frank
Publisher: name: QUBES Educational Resources
Year: 2023

description: This report will focus on the sensitivity analysis of ordinary differential equation (ODE) models since they can be used to model so-called Low Frequency Oscillations (LFOs).
title: Chemical properties and efficacy of Sweet orange essential oil nanoemulsion applied as cold aerosol against two stored product beetles
Creators: name: Giunti, Giulia
name: Campolo, Orlando
name: Russo, Agatino
name: Palmeri, Vincenzo
name: Zappala, Lucia
Publisher: name: Julius Kühn-Institut
Year: 2018

description: Common control strategies to manage stored product pests are mainly based on the use of synthetic insecticides and fumigants. Consumer’s demand for pesticide-free food, and the increasing resistance of pests to traditional insecticides, dictate the need to evaluate alternative control methods. For this purpose, many sustainable techniques have been tested for the control of stored product pests. Among them, Citrus essential oils can represent a valid alternative to synthetic insecticides. The effects of Sweet Orange essential oil (EO) nanoemulsion applied as cold aerosol were evaluated against adults of Tribolium confusum du Val (Coleoptera: Tenebrionidae) and Cryptolestes ferrugineus Stephens (Coleoptera: Cucujidae). Both chemical and physical characterization of the EO-based formulation was carried out. The developed formulation had an average size belonging to the nanometer scale and a low polydispersity index. The relatively high zeta potential value confirms the stability over time of the developed formulation. The efficacy of the tested formulation showed a dose-dependent response and the cumulated mortality of the exposed insects increaseduntil 24h of exposure for C. ferrugineus and until 120h for T. confusum. The tested formulation was more effective against T. confusum adults (LD50= 86.30 ppm) than C. ferrugineus ones (LD50= 36.79 ppm). The results of this study coupled with the large availability at reasonable costs of Sweet orange EO, are promising for the potential development of new tools against stored product pests.
description: Julius-Kühn-Archiv, Nr. 463, Vol. 2 (2018): Proceedings of the 12th International Working Conference on Stored Product Protection (IWCSPP) in Berlin, Germany, October 7-11, 2018
Tropfenbewegung und Stofftransport in technischen Flüssig/flüssig-Systemen. Teil 2: Auswirkung von Grenzflächeneffekten und Verunreinigungen
Creators: name: Schulz, Joschka M.
name: Petzold, Marc
name: Böhm, Lutz
name: Kraume, Matthias
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 660 Chemische Verfahrenstechnik
subject: Einzeltropfen
subject: Fluiddynamik
subject: Marangoni-Konvektion
subject: Nanopartikel
subject: Tensid
subject: Verunreinigung
subject: fluid dynamics
subject: impurities
subject: Marangoni convection
subject: nanoparticles

description: Fluiddynamik und Stofftransportprozessen kommt bei der Dimensionierung von Flüssig/flüssig-Kontaktapparaten eine entscheidende Bedeutung zu. Die Vorhersage von Betriebsparametern wird durch Schwarm- und Grenzflächeneffekte maßgeblich erschwert. Anhand von Einzeltropfenuntersuchungen kann eine grundlegende Vorhersage für fluiddynamisches Verhalten und Stofftransportleistung auf Basis einfacher Experimente und zahlreicher publizierter Korrelationen und Theorien getroffen werden. Im ersten Teil wurden die Grundlagen zur Beschreibung der Fluiddynamik und des Stofftransports für den Fall unbeeinflusster Grenzflächen erläutert. Hier wird nun ein Überblick über relevante Grenzflächenphänomene und den Einfluss verschiedener Stoffklassen gegeben, die als Begleitkomponenten oder Verunreinigung für technische Systeme üblich sind.
Multi-wavelength emissions from the millisecond pulsar binary PSR J1023+0038 during an accretion active state
Creators: name: Takata, J.
name: Li, K. L.
name: Leung, G. C. K.
name: Kong, A. K. H.
name: Tam, P. H. T.
name: Hui, C. Y.
name: Wu, E. M. H.
name: Xing, Y.
name: Cao, Y.
name: Tang, S.
name: Wang, Z.
name: Cheng, K. S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent observations strongly suggest that the millisecond pulsar binary PSR J1023+0038 has developed an accretion disk since 2013 June. We present a multi-wavelength analysis of PSR J1023+0038, which reveals that 1) its gamma-rays suddenly brightened within a few days in June/July 2013 and has remained at a high gamma-ray state for several months; 2) both UV and X-ray fluxes have increased by roughly an order of magnitude, and 3) the spectral energy distribution has changed significantly after the gamma-ray sudden flux change. Time variabilities associated with UV and X-rays are on the order of 100-500 seconds and 50-100 seconds, respectively. Our model suggests that a newly formed accretion disk due to the sudden increase of the stellar wind could explain the changes of all these observed features. The increase of UV is emitted from the disk, and a new component in gamma-rays is produced by inverse Compton scattering between the new UV component and pulsar wind. The increase of X-rays results from the enhancement of injection pulsar wind energy into the intra-binary shock due to the increase of the stellar wind. We also predict that the radio pulses may be blocked by the evaporated winds from the disk and the pulsar is still powered by rotation.
description: 8 pages, 3 figures; accepted for publication in ApJ
title: Feasibility of underground hydrogen storage with salt caverns in the offshore Polda Basin, South Australia
Creators: name: L., Wang
name: L., Wang
name: S., Rees
name: A.L., Carr
name: A.J., Feitz
Publisher: name: Commonwealth of Australia (Geoscience Australia)
Year: 2023
Subjects: subject: EARTH SCIENCES
subject: Polda Basin
subject: underground hydrogen storage
subject: halite cavern
subject: Kilroo Formation
subject: halite deposit
subject: storage capacity
subject: renewable hydrogen
subject: Exploring for the Future
subject: Published_External

description: Geoscience Australia has conducted a feasibility analysis on underground gas/hydrogen storage (UGS/UHS) through creating salt caverns in the offshore Polda Basin, South Australia. The Mercury structure in the offshore part of the Polda Basin has massive halite deposits in the Neoproterozoic Kilroo Formation at depth intervals of 1376.8–2383.8 mSS (mSS: depth (m) below mean sea level) (salt pillows), 2383.8–2538.8 mSS and 2807.8–3083.8 mSS (salt interbeds). The halite is distributed over 217 km2 approximately 20 km N-S and approximately 20 km E-W, forming an anticlinal structure near Mercury 1 well. Well data (Mercury 1) suggests the total net thickness of halite is up to 1000 m over the lower Kilroo Formation and 468 m above 2000 mSS, which is within the depth range considered suitable for UHS. The potential storage site analysed is located approximately 50-70 km offshore, west of the Eyre Peninsula and approximately 200 km from Port Lincoln. The lower thermal gradient (cold basin) observed, and overburden and formation fracture gradients, are favourable for salt cavern design. The 1376.8–1539.8 mSS and 1575.6–2367.6 mSS halite intervals in Mercury 1 were identified as potential candidates for cavern creation in the future UHS program. A conceptual design of a halite cavern is presented for the depth range of 1650–2000 mSS. The cylindrical halite cavern is evaluated for two diameters (60 m and 100 m) with the calculated hydrogen storage capacity of approximately 240 GWh and 665 GWh (equivalent to approximately 7200 and 20000 tonnes), respectively. Potentially multiple halite caverns could be built within the thick halite deposits of the Mercury structure. Compared to one of Australia’s non-hydrocarbon energy storage resources currently under construction (Snowy 2.0 hydropower) at 350 GWh, UHS within a halite cavern in the offshore Polda Basin provides an alternative for large-scale energy storage that is potentially quicker to build, has less environmental footprints and is not impacted by drought.
Customers’ Perceptions of FinTech Adaptability in the Islamic Banking Sector: Comparative study on Malaysia and Saudi Arabia
Creators: name: Alam, Md. Mahmudul
Publisher: name: figshare
Year: 2023
Subjects: Financial institutions (incl. banking)
Banking, finance and investment not elsewhere classified
Islamic studies

description: Purpose – This paper aims to compare the perceptions of Islamic bank customers concerning FinTech services in Malaysia and Saudi Arabia. It also investigates the level to which customers are willing to adapt FinTech services. Design/methodology/approach – Primary data were collected from May to September 2019 using a questionnaire to survey 102 Islamic bank customers in Malaysia, and 147 in Saudi Arabia.The data are analysed based on Structural Equation Modelling (SEM) using the partial least squares (PLS) approach. Findings – The findings show that knowledge, attitude, and subjective norms are the highly significant determining factors that influence customers’ opinions on adapting to new technology, but awareness demonstrates only a moderately positive effect. Moreover, the impact of these factors on the intention to adopt FinTech services significantly differs between Malaysian and Saudi Arabian customers. Originality/value – This is an original study based on primary data on customers of Islamic banking in Malaysia and Saudi Arabia. It provides some novel insights into how the Islamic banking industry can boost customers’ confidence and enhance their patronage by adopting FinTech in their business operation model. These findings should be of value to managers, policymakers, and regulators in the Islamic banking industry in both Muslim and non-Muslim countries.
Exploring Structure and Function of Redox Intermediates in [NiFe]-Hydrogenases by an Advanced Experimental Approach for Solvated, Lyophilized and Crystallized Metalloenzymes
Creators: name: Lorent, Christian
name: Pelmenschikov, Vladimir
name: Frielingsdorf, Stefan
name: Schoknecht, Janna
name: Caserta, Giorgio
name: Yoda, Yoshitaka
name: Wang, Hongxin
name: Tamasaku, Kenji
name: Lenz, Oliver
name: Cramer, Stephen P.
name: Horch, Marius
name: Lauterbach, Lars
name: Zebger, Ingo
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 541 Physikalische Chemie
subject: [NiFe]-hydrogenase
subject: biocatalysis
subject: in situ spectroscopy
subject: metalloenzymes
subject: vibrational spectroscopy

description: To study metalloenzymes in detail, we developed a new experimental setup allowing the controlled preparation of catalytic intermediates for characterization by various spectroscopic techniques. The in situ monitoring of redox transitions by infrared spectroscopy in enzyme lyophilizate, crystals, and solution during gas exchange in a wide temperature range can be accomplished as well. Two O2-tolerant [NiFe]-hydrogenases were investigated as model systems. First, we utilized our platform to prepare highly concentrated hydrogenase lyophilizate in a paramagnetic state harboring a bridging hydride. This procedure proved beneficial for 57Fe nuclear resonance vibrational spectroscopy and revealed, in combination with density functional theory calculations, the vibrational fingerprint of this catalytic intermediate. The same in situ IR setup, combined with resonance Raman spectroscopy, provided detailed insights into the redox chemistry of enzyme crystals, underlining the general necessity to complement X-ray crystallographic data with spectroscopic analyses.
Lebensqualitätsbefragungen von Menschen mit Behinderung in der Schweiz: Eine Forschungsarbeit zu den Möglichkeiten und Hindernissen von Peer-Befragungen mit dem überarbeiteten Fragebogen von Curaviva
Creators: name: Hesse, Sebastia
Publisher: name: Zenodo
Year: 2022

description: Die vorliegende Forschungsarbeit möchte die Möglichkeiten und Hindernisse in der Lebensqualitätserfassung von Menschen mit Behinderung aufzeigen, wenn diese selbst durch Menschen mit Behinderung als Peer durchgeführt wird. Lebensqualitätserfassung dient dem Sichtbarmachen von Lebensumständen, woraus konkrete Veränderungen für die Lebenswelt der Befragten abgeleitet werden können. Lebensqualitätsbefragungen durch Peers finden in der Schweiz bisher nicht statt. In einer Projektarbeit von Studierenden der Hochschule Luzern Soziale Arbeit wurde 2020 der Fragebogen zur Lebensqualität von Curaviva überarbeitet. Der Fragebogen wurde in Leichter Sprache, mit Unterstützter Kommunikation und der Möglichkeit für den Einsatz in Peer-Befragungen konzipiert. Vier Lebensqualitätsbefragungen durch einen Peer und einer Expertin wurden mit diesem Fragebogen im Rahmen dieser Forschungsarbeit in der Stiftung Brändi organisiert, videodokumentiert und untersucht. Die Autorenschaft - Sebastian Hesse erstellte ihre Erkenntnisse auf Grundlage von Fachliteratur, den Interviews mit den Beteiligten der Befragungen und stellt diese einer Aussenperspektive von der Expertin Stefania Calabrese und ihrer Analyse der Videos gegenüber. Erkenntnisse dieser Arbeit sind, dass Peer-Befragungen mit dem überarbeiteten Fragebogen überzeugende Resultate ermöglichen, auch wenn professionelle Schulung für Befragende bisher kaum stattfanden. Neben einem hohen Spassfaktor in den Befragungen mit dem Peer wurden zahlreiche Mehrwerte für alle Beteiligten gewonnen.
description: + Code Diss LU: hslusa basp + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Sozialpädagogik, 2022 + NL-Code: NLLUHSA202210
A note on central moments in $C^*$-algebras
Creators: name: Léka, Zoltán
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L53, 60B99

description: We present sharp estimates of the $k^{\rm th}$ central moments of normal elements in $C^*$-algebras. We shall obtain an upper bound for the weak moments of general elements as well.
description: 9 pages
Phylogeographic and evolutionary history analyses of the warty crab Eriphia verrucosa (Decapoda, Brachyura, Eriphiidae) unveil genetic imprints of a late Pleistocene vicariant event across the Gibraltar Strait, erased by postglacial expansion and admixture among refugial lineages
Creators: name: Deli, Temim
name: Kiel, Christina
name: Schubart, Christoph D.
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Crustacea, Mitochondrial DNA, Mediterranean Sea, East Atlantic, Population genetics, Historical biogeography
subject: 590 Tiere (Zoologie)

description: Background The Pleistocene cyclic sea-level fluctuations are thought to have markedly affected the distribution and genetic architecture of Atlanto-Mediterranean biota. Despite the acknowledged key role played by these historical events in shaping population genetic structure of marine species, little is still known about the processes involved in shaping the spatial distribution of genetic variation within intertidal species. We intended in this study to reconstruct the phylogeography of a common and widely distributed coastal species across the East Atlantic and Mediterranean Sea (the warty crab Eriphia verrucosa), aiming to unravel potential microevolutionary processes likely involved in shaping its genetic polymorphism. For this purpose, a total of 155 specimens of E. verrucosa from 35 locations across the entire distribution range were analyzed by comparing a 453 basepairs region of the mitochondrial gene cytochrome oxidase subunit 1 (Cox1). Results Our results unveiled the prevalence of high genetic connectivity among East Atlantic and Mediterranean populations, with noticeable genetic distinctiveness of the peripheral population from the Azores. Spatio-temporal patterns of genetic diversification and demographic history allowed retrieving genetic imprints of late Pleistocene vicariant event across the Gibraltar Strait followed by subsequent postglacial expansion events for both the East Atlantic and Mediterranean regions. Integrative evidences from the outcomes of comparison of regional genetic diversification, as well as evolutionary and biogeographic histories reconstructions, support the existence of potential glacial refugia for E. verrucosa in the East Atlantic and western Mediterranean. Our results also revealed low levels of genetic variability along with recent demographic and spatial expansion events for eastern Mediterranean warty crabs, suggesting that the eastern areas within the distribution range of the species might have been recently colonized from putative glacial refugia. Conclusions These findings provide new insights into the phylogeography and evolutionary history of a common but poorly studied Atlanto-Mediterranean decapod species. Specifically, they contribute to the understanding of the impact of historical processes on shaping contemporary population genetic structure and diversity in intertidal marine species.
Nontrivial topological states on a Möbius band
Creators: name: Beugeling, W.
name: Quelle, A.
name: Smith, C. Morais
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In the field of topological insulators, the topological properties of quantum states in samples with simple geometries, such as a cylinder or a ribbon, have been classified and understood during the last decade. Here, we extend these studies to a Möbius band, and argue that its lack of orientability prevents a smooth global definition of parity-odd quantities such as pseudovectors. In particular, the Chern number, the topological invariant for the quantum Hall effect, lies in this class. The definition of spin on the Möbius band translates into the idea of the orientable double cover, an analogy used to explain the possibility of having the quantum spin Hall effect on the Möbius band. We also provide symmetry arguments to show the possible lattice structures and Hamiltonian terms for which topological states may exist in a Möbius band, and we locate our systems in the classification of topological states. Then, we propose a method to calculate Möbius dispersions from those of the cylinder, and we show the results for a honeycomb and a kagome Möbius band with different types of edge termination. Although the quantum spin Hall effect may occur in these systems when intrinsic spin-orbit coupling is present, the quantum Hall effect is more intricate and requires the presence of a domain wall in the sample. We propose an experimental set-up which could allow for the realization of the elusive quantum Hall effect in a Möbius band.
description: 10 pages, 7 figures
Aufwertungs- und Verdrängungsprozesse in Wohnbaugenossenschaften: Gemeinnützige Wohnbauträger im Dilemma zwischen Wachstum und sozialer Verantwortung und welche Handlungsmöglichkeiten die Soziokulturelle Animation bieten kann
Creators: name: Grüter, Milo
Publisher: name: Zenodo
Year: 2022

description: Die vorliegende Arbeit setzt sich mit Verdrängungsprozessen in einem genossenschaftlichen Wohnbau auseinander. Anhand theoretischer Grundlagen wird aufgezeigt, was Verdrängung ist, wie sie stattfindet, wie sie wahrgenommen wird und welche Auswirkungen die Verdrängung von sozioökonomisch benachteiligten Bewohner*innen aus ihrem Sozialraum haben kann. Ein Fokus der Arbeit liegt auf den Handlungsmöglichkeiten, die Professionelle der Soziokulturellen Animation haben, um mit ihrer sozialräumlich orientierten Arbeit Verdrängungsprozessen entgegenzuwirken. Die theoretisch aufgearbeitete Problemstellung wird am Beispiel der Siedlung Obermaihof der allgemeinen baugenossenschaft luzern (abl) gezeigt. Aus einer qualitativen Forschung mit Experteninterviews sowie der Befragung einiger Bewohner*innen heraus konkretisierten sich Herausforderungen und Handlungsmöglichkeiten für die Soziokulturelle Animation im wohnbaugenossenschaftlichen Kontext. Es zeigt sich, dass Verdrängung sozioökonomisch benachteiligter Gruppen auch in Wohnbaugenossenschaften ein zu beachtendes Problem darstellt. Hauptursachen der Verdrängung im Obermaihof sind mangelnde Mitsprachemöglichkeiten für Betroffene im Aufwertungsprozess, die tendenzielle Abnahme des Genossenschaftsgedankens sowie die Strategie sozialer Durchmischung. Auf diese Ursachen können professionelle der Soziokulturellen Animation partizipativ, präventiv und sensibilisierend einwirken.
description: + Code Diss LU: hslusa bask + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Soziokultur, 2022 + NL-Code: NLLUHSA202210
Population and colony structure of an ant with territorial males, Cardiocondyla venustula
Creators: name: Jacobs, Susanne
name: Heinze, Jürgen
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Social insects, Colony structure, Population viscosity, Sib-mating, Life history evolution
subject: 590 Tiere (Zoologie)

description: Background Many species of social insects have large-scale mating and dispersal flights and their populations are therefore often relatively homogenous. In contrast, dispersal on the wing appears to be uncommon in most species of the ant genus Cardiocondyla, because its males are wingless and the winged queens mate in their natal nests before dispersing on foot. Here we examine the population structure of C. venustula from South Africa. This species is of particular interest for the analysis of life history evolution in Cardiocondyla, as it occupies a phylogenetic position between tropical species with multi-queen (polygynous) colonies and fighting males and a Palearctic clade with single-queen colonies and mutually peaceful males. Males of C. venustula exhibit an intermediate strategy between lethal fighting and complete tolerance – they mostly engage in non-lethal fights and defend small territories inside their natal nests. We investigated how this reproductive behavior influences colony and population structure by analyzing samples on two geographic scales in South Africa: a small 40 × 40m2 plot and a larger area with distances up to 5 km between sampling sites in Rietvlei Nature Reserve near Pretoria. Results Colonies were found to be facultatively polygynous and queens appear to mate only with a single male. The extraordinarily high inbreeding coefficient suggests regular sib-mating. Budding by workers and young queens is the predominant mode of colony-founding and leads to high population viscosity. In addition, some queens appear to found colonies independently or through adoption into foreign nests. Conclusion While C. venustula resembles tropical Cardiocondyla in queen number and mating frequency, it differs by the absence of winged disperser males. Dispersal by solitary, mated queens on foot or by short flights and their adoption by alien colonies might promote gene flow between colonies and counteract prolonged inbreeding. The abundance of suitable habitat and the high density of nests facilitate the spread of this species by budding and together with the apparent resistance against inbreeding make it a highly successful pioneer species and invader of degraded and man-made habitats.
title: Fogging loads of California fresh citrus for control of Asian citrus psyllid, Diaphorina citri
Creators: name: Corbett, Stephen
name: Sorenson, David
name: Tofangsazi, Nastaran
name: Gautam, Sandipa G.
name: Walse, Spencer
Publisher: name: Julius -Kühn-Institut
Year: 2018

description: Contact insecticides are commonly applied as fogs to disinfest and disinfect spaces. Recently, these fogs have been adapted to treat commodity within the spaces, and much has been learned regarding the efficacy of this process. When considering fresh citrus in California, fogs are applied to control both insects and microbes. One insect pest, the Asian citrus psyllid (ACP), Diaphorina citri, is a quarantine pest in California and limiting its geographic distribution is a major goal of the California citrus industry. While a variety of phytosanitary measures can be used to control adult ACP once fruit is at a packing house, ultimately, a treatment must be developed to disinfest field-run fruit prior to its exiting the grove. High-pressure fogging with 1,100-L of an aqueous mixture containing 0.2% Evergreen® (6% pyrethrins & 60% piperonyl butoxide) and 0.5% (v/v) BreakThru® (polysiloxane surfactant) was explored in laboratory-, pilot-, and commercial-scale trials as an approach to disinfest a 48-bin trailer load of fresh citrus. Laboratory-scale studies were conducted to quantify, and subsequently model, insecticidal coverage as a function of temperature, surface area, droplet size, and fog volume. Results are discussed in the context of experimental variability across confirmatory trials and continued efforts to optimize the technical and economic feasibility of fogging as a postharvest control strategy.
description: Julius-Kühn-Archiv, Nr. 463, Vol. 2 (2018): Proceedings of the 12th International Working Conference on Stored Product Protection (IWCSPP) in Berlin, Germany, October 7-11, 2018
Chiral symmetry and bulk--boundary correspondence in periodically driven one-dimensional systems
Creators: name: Asboth, J. K.
name: Tarasinski, B.
name: Delplace, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Over the past few years, topological insulators have taken center stage in solid state physics. The desire to tune the topological invariants of the bulk and thus control the number of edge states has steered theorists and experimentalists towards periodically driving parameters of these systems. In such periodically driven setups, by varying the drive sequence the effective (Floquet) Hamiltonian can be engineered to be topological: then, the principle of bulk--boundary correspondence guarantees the existence of robust edge states. It has also been realized, however, that periodically driven systems can host edge states not predicted by the Floquet Hamiltonian. The exploration of such edge states, and the corresponding topological phases unique to periodically driven systems, has only recently begun. We contribute to this goal by identifying the bulk topological invariants of periodically driven one-dimensional lattice Hamiltonians with chiral symmetry. We find simple closed expressions for these invariants, as winding numbers of blocks of the unitary operator corresponding to a part of the time evolution, and ways to tune these invariants using sublattice shifts. We illustrate our ideas on the periodically driven Su-Schrieffer-Heeger model, which we map to a discrete time quantum walk, allowing theoretical results about either of these systems to be applied to the other. Our work helps interpret the results of recent simulations where a large number of Floquet Majorana fermions in periodically driven superconductors have been found, and of recent experiments on discrete time quantum walks.
Wohnen und Betreuung im Alter: Das schweizerische und das finnische Modell im Vergleich
Creators: name: Grieser, Ana Maria
Publisher: name: Zenodo
Year: 2022

description: Der demografische Wandel in unseren Gesellschaften führt dazu, dass eine immer grössere Anzahl von Menschen stetig älter wird. In der Schweiz ist die Mehrheit der älteren Menschen zufrieden mit ihrem Leben und ihrem Wohnumfeld. Gehäuft wohnen sie in ihren privaten Haushalten und sind aufgrund ihrer Ressourcen aktiv und sozial gut vernetzt. Eine kleinere Gruppe ist hingegen von Altersarmut und anderen Belastungen betroffen und schon früh auf verschiedene Hilfeleistungen angewiesen. Die Gruppe der hochaltrigen Menschen hingegen sind gehäuft hilfe- und pflegebedürftig und auf Unterstützungsangebote angewiesen. In Finnland wird seit einigen Jahren ein Pflegefamiliensystem für ältere Menschen erfolgreich umgesetzt. Dieses Modell kann zum einen als Wohnmöglichkeit für hochaltrige Menschen eingesetzt werden, zum anderen kann es ein gutes Lebens- und Wohnumfeld für belastete ältere Menschen bieten. Die vorliegende Arbeit untersucht mittels eines selbsterarbeiteten Fragebogens Wohn- und Betreuungsformen älterer Menschen sowie ihre Zufriedenheit damit aus der Perspektive der Fachpersonen. Ausserdem werden Kenntnis und Einschätzung des finnischen Modells der Pflegefamilien für ältere Menschen bei Schweizer Fachpersonen erforscht und den Erfahrungen der finnischen Fachpersonen mit diesem Modell in ihrem Land nachgegangen. Die Umsetzung des finnischen Pflegefamilienmodells in der Schweiz könnte eine Versorgungslücke in der Schweiz decken und zur Entwicklung einer breiteren Palette von Angeboten führen, welche den Bedürfnissen der älteren Personen besser entsprechen könnte.
description: + Code Diss LU: hslusa basp + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Sozialpädagogik, 2022 + NL-Code: NLLUHSA202210
Influences of Creativity and Resource Availability in the Intelligent Career Framework: Empirical Investigation of Nigerian Entrepreneurs
Creators: name: Alam, Md. Mahmudul
Publisher: name: figshare
Year: 2023
Subjects: Farm management, rural management and agribusiness
Human resources management

description: Purpose: This research investigates the influence of creativity and resource availability on career competencies and career success of entrepreneurs in Nigeria using the Intelligent Career Framework. Design/methodology/approach: Data was obtained using answers to questionnaires given to 348 successful entrepreneurs. The data was analysed using non-parametric software (Smart-PLS). Finding: The results indicate that entrepreneurs who understand “know-why”, “know-how”, and “know-whom” can access the required resources and are doing well in their careers. It is suggested that these competencies were significantly related to entrepreneurial career success. Resource availability moderates the relationship of knowing-how, knowing-why competencies and career success, while creativity moderates only the link between knowing-whom and entrepreneurs having successful careers. Research limitations/implications: The results help us to comprehend better the nature of successful entrepreneurial careers and the prominent role of tripartite competencies in achieving a successful career. Also emphasised here is the prominence of a more holistic perspective of these components based on a mix of social, motivational, and human capital. Practical implications: These findings hinted that entrepreneur should pay uniform consideration in fostering each career competency. There are implications for career advisers, practitioners, and entrepreneurship programs. Originality/value: This is a first-of-its-kind research that used primary source data in understanding career competencies - “knowing-how, knowing-whom, and knowing-why” - with entrepreneurs' career success in Nigeria.