bluuebunny/crossref_metadata_2025_split huggingface dataset:
Inactive Al3+-doped La(CoCrFeMnNiAlx)1/(5+x)O3 high-entropy perovskite oxides as high performance supercapacitor electrodes
Authors: Guo Meng , Liu Yufeng , Zhang Fengnian , Cheng Fuhao , Cheng Chufei , Miao Yang , Gao Feng , Yu Jun 
Published: April 2022

AbstractA series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAlx)1/(5+x)O3−δ (x = 0.4, 0.5, 0.6, and 0.7) have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for supercapacitors. The crystal structure, microstructure, and elemental composition of HEPOs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) in detail. The electrochemical properties of HEPOs as supercapacitor electrodes were elucidated. The specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) are 281.84, 353.65, 325.60, and 259.30 F/g at the current density of 1 A/g, respectively. After 2000 cycles, the specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) remain 85.01%, 88.61%, 86.37%, and 91.25%, respectively. Such outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al3+-doping suppressing active ion aggregation during charge—discharge process. This research highlights the potential of HEPOs as electrodes for supercapacitors.
Interior-collapsing mechanism by hydrothermal process of the MgAl2O4/MgO porous ceramic
Authors: Yao Yao , Zhang Yue 
Published: April 2022

AbstractCeramic core is a critical component in the super-alloy turbine blade casting. In our previous work, a novel multi-phase MgAl2O4/MgO porous ceramic was prepared for this purpose. The most important property was that it crumbled completely after hydrothermal treatment in just pure water, due to the hydration of MgO. In this work, the hydration process of the MgO embedded in the inert matrix was investigated in detail. The collapse behaved as an interior destruction without any bulk expansion of the sample. The hydration percentage was the only factor related to the water-collapsibility. The morphology of hydration product indicated that the reaction advanced in particular direction. Based on the finite element analysis for the expansion effect on the porous structure, the interior-collapsing mechanism was proposed. During the hydration process, the MgO grains exerted pressure to the surrounding matrix and induced the collapse in the adjacent structure. This process took place throughout the matrix. Finally, the sample crumbled completely to the powders. No bulk dilatation was detected before the powdering, indicating that the collapse process would not exert pressure outward. Thus the alloy blade would not be damaged during the removal of the ceramic core. It was also predicted that the decrease in the MgO grain size was beneficial to the water-collapsibility.
Wie können Lehramtsstudierende bei der wissenschaftsbasierten Reflexion selbsterlebter schulischer Situationen unterstützt werden? Eine quasi-experimentelle Studie zur Lernwirksamkeit von Prompts und Feedback im Praxissemester
Authors: Schellenbach-Zell Judith 
Published: April 2022

ZusammenfassungDer vorliegende Beitrag greift aktuelle Fragen der Forschung zur Theorie-Praxis-Verknüpfung im Rahmen von Praxisphasen auf und legt den Fokus auf Instrumente der Lernbegleitung, die die Nutzung von Theorien und Befunden bei der Erklärung selbstgewählter schulischer Situationen unterstützen sollen. Diese Reflexion praktischer Situationen erfolgt schriftlich fixiert im Rahmen von Lerntagebüchern. Das untersuchte Instrument enthält zum einen strukturierende Hinweise in Form von Prompts sowie zum anderen ein nachträgliches leitfadengestütztes Feedback durch die begleitenden Dozierenden. Entsprechend werden drei Gruppen in der Lernbegleitung durch das Praxissemester im Master of Education quasi-experimentell miteinander verglichen: Während die erste Experimentalgruppe nur strukturierende Hinweise (Prompts) erhielt, wurden diese für die zweite Experimentalgruppe mit leitfadengestütztem Feedback durch die Dozierenden kombiniert. Die Kontrollgruppe erhielt allgemeine Hinweise zur Reflexion der schulischen Situation. Die Ergebnisse zeigen, dass sich der Einsatz von Prompts und Feedback in der Lernbegleitung positiv auf die Verwendung von Theorien und Befunden bei der Erklärung von schulischen Situationen auswirkt.
Rights, Mini-Publics, and Judicial Review
Authors: GJESDAL ADAM 
Published: April 2022

AbstractLandmark Supreme Court rulings determine American law by adjudicating among competing reasonable interpretations of basic political rights. Jeremy Waldron argues that this practice is democratically illegitimate because what determines the content of basic rights is a bare majority vote of an unelected, democratically unaccountable, elitist body of nine judges. I argue that Waldron's democratic critique of judicial review has implications for real-world reform, but not the implications he thinks it has. He argues that systems of legislative supremacy over the judiciary are democratically preferable to the American one. I provide reasons why his argument is unsound and explain that, properly construed, Waldron's premises support implementing a system where ordinary citizens chosen by lottery participate in a deliberative mini-public to vote on which reasonable interpretation of a basic political right will become the law of the land.
Dancehall City: Zongo Identity and Jamaican Rude Performance in Ghanaian Popular Culture
Authors: Alleyne Osei 
Published: April 2022

AbstractThe explosion of Ghanaian Reggae-Dancehall reflects the influence of Jamaican-inspired popular culture in Ghana today. This subculture is championed by local Rastafarians and by youth from the zongos (internal migrant, largely Islamic, unplanned neighborhoods). Suffering social alienation, many zongo artists have adopted postures similar to their Jamaican counterparts—mirroring Rasta and rude identities as counter-hegemonic resistance. Alleyne explores several artists variously located between the zongo, the Reggae diaspora, and the Ghanaian state, examining how subjects rework Jamaican tropes and voice their aspirations within a globalizing Ghana and rethinking the zongo as space of rousing diasporic consciousness.
Bringing to Scale: The Scaling-Up Concept in African Agricultural Value Chains
Authors: Bassett Thomas J. , Koné Moussa , Munro William 
Published: April 2022

AbstractThe concept of “scaling up” value chains dominates the African agricultural development literature. Scaling up commonly refers to three inter-related objectives: increasing agricultural production and quality, expanding farmer engagement with markets, and adding greater value to commodities that benefits all actors. Bassett, Koné, and Munro provide a critique of the assumption of linear and progressive development embedded in the scaling-up concept and offer an alternative relational network approach that highlights the contingent and relational dynamics of agricultural value chains. The research compares the selling patterns of cashew growers participating in OLAM’s Sustainable Cashew Growers Program in Côte d’Ivoire during 2018 and 2019.
The Mystery of the Missing Horses: How to Uncover an Ottoman Shadow Economy
Authors: Koh Choon Hwee 
Published: April 2022

AbstractIn the 1690s, Ottoman bureaucrats reformed the sprawling postal system, a vital communications infrastructure that undergirded imperial power. Despite the expanding monitoring capacity that resulted, a constant shortage of horses regularly left couriers stranded for days and delayed official correspondence. This essay investigates this paradox and draws on a series of fifty-one Ottoman imperial decrees and reports from 1690 to 1833 to make three arguments. It first shows how bureaucrats perceived and tried to fix the problem by rationing horse usage and strengthening enforcement of rules. Second, it reveals that a range of official and non-official actors were diverting horses toward profit-making ventures in what I call a “shadow economy.” Third, it explains why Ottoman bureaucrats were unable to recognize the existence of this shadow economy. Like contemporary administrators in Qing China who found it hard to synthesize intelligence from different frontiers, Ottoman bureaucrats treated multiple reports of missing horses as discrete, unconnected events rather than connected evidence of a competing market demand for horses. Compounding this problem of a blinkered informational order, profound economic and social changes meant that bureaucrats in the capital were slow to realize that long-held official entitlements regarding horse usage for personal uses were aiding the growth of the shadow economy. I conclude by considering some social consequences of commercial forces in Ottoman society and contemporary France, and the stakes of this study with respect to the rise of anonymity in market exchanges, a property of capitalism.
The Colombian Caribbean Sea: a tropical habitat for the Vulnerable sperm whalePhyseter macrocephalus?
Authors: Avila Isabel Cristina , Farías-Curtidor Nohelia , Castellanos-Mora Luisa , do Amaral Karina Bohrer , Barragán-Barrera Dalia C. , Orozco Carlos Andrés , León Jorge , Puentes Vladimir 
Published: April 2022

AbstractWe studied the sperm whalePhyseter macrocephalusin the Colombian Caribbean by combining data from our offshore surveys of behaviour, encounter rate, group structure and density with data from the literature. We describe for the first time the potential distribution of sperm whales in the Colombian Caribbean, using sighting and acoustic data obtained during our surveys, published information, and opportunistic encounters during 1988–2020. We conducted surveys on seismic vessels over 703 days during 2011–2016, covering an area of 68,904 km2. We recorded 98 individuals in a total of 50 groups, a density of 1.42 individuals per 1,000 km2. To determine the potential distribution of the species, we builtMaxentmodels with uncorrelated environmental variables at five depths (from the surface to c. 2,000 m). The model for 1,000 m depth had the best performance, with areas of high probability of occurrence of sperm whales in the south and north-east Colombian Caribbean over the shelf break to waters up to c. 3,000 m deep, at a median distance of 107 km from the coast, and near the Archipelago of San Andrés, Old Providence and Saint Catherine in the north-west. This area may be an important tropical habitat for sperm whales, in which they socialize, rest, breed and feed. Our study underlines the importance of monitoring marine mammals offshore and describes the potential distribution of sperm whales in the Colombian Caribbean, supporting conservation actions for this Vulnerable species, which is currently facing several threats in this region.
Food and Power in Early Medieval England: Rethinking Feorm
Authors: Lambert Tom , Leggett Sam 
Published: April 2022

ABSTRACTIt has long been accepted that royal households in the pre-Viking period subsisted on annual renders of food, sometimes termed feorm, from the free peasantry. This model of royal support is historiographically fundamental, in the sense that it is built into the foundations of much current thinking not just on the economics of kingship, but on its origins, and on the process of ‘manorialization’. This article argues that the texts which are conventionally read as references to these general-purpose food supplies are in fact concerned with feasts. This is apparent when we scrutinize both the content of food lists – which are so dominated by animal protein as to be inconsistent with the stable isotope evidence for elite diet examined in our companion article – and the contexts of documentary references to feorm and (in Latin) pastus. The article concludes with a review of the potentially far-reaching implications of this finding.
Crater Ejecta Across Maxwell Montes, Venus, and Possible Effects on Future Rock Type Measurements
Authors: Campbell Bruce A. , Whitten Jennifer L. 
Published: April 2022

AbstractVenus highlands such as Maxwell Montes are an exploration target in the search for a past water‐rich environment. We combine Magellan and Arecibo radar data to characterize surface properties across Maxwell for orbital or landed investigations. Arecibo data reveal a region surrounding and west of the 90‐km crater Cleopatra with lower radar echoes and circular polarization ratio despite increased surface reflectivity. Modeling of microwave emissivity shows that the surface undergoes step‐like reflectivity shifts at ∼6056.2 km and ∼6,061 km radius, such that the changes in radar echo between these altitudes are not due solely to dielectric effects. We propose that fine‐grained Cleopatra ejecta mantles much of Maxwell Montes, consistent with Venus distal crater ejecta patterns and the longevity of mantling debris in the highlands. Future orbital or landed studies must consider the thickness of ejecta, source material, and effects of shock or melting on ejecta mineralogy.
Enhanced Diapycnal Mixing in the Deep Ocean Around the Island of Taiwan
Authors: Tang Qunshu , Jing Zhiyou , Li Jiabiao , Sun Jie 
Published: April 2022

AbstractThe deep ocean to the east and south of Taiwan Island‒including the Okinawa Trough, Ryukyu Arc, Philippine Sea, Luzon Strait, and the northeast South China Sea‒is one of the most prominent mixing hotspots of the global ocean. The high‐resolution seismic reflection technique can provide detailed views of the water's finestructure and near‐transient turbulent mixing therein. Using legacy data from two seismic cruises, we present the finestructure and quantify turbulent mixing within the thermocline and sub‐thermocline (100–1,000 m depths) to the east and south offshore Taiwan. We derive dissipation rate ε and diapycnal diffusivity Kρ by analyzing the inertial convective turbulence regime of horizontal slope spectra from the seismically auto‐tracked wave‐fields. Dissipation and diffusivities are locally enhanced close to the topography exceeding 10−6 W⋅kg−1 and 10−2 m2⋅s−1, and gradually decrease to 10−9 W⋅kg−1 and 10−4‒10−5 m2⋅s−1 beyond tens of kilometers. The mean diffusivity distribution pattern suggests that a large fraction of the energy dissipates close to the topography and a significant fraction is radiated into the open ocean. Both the tides and west boundary current drive the significantly enhanced mixing close to the topography of ridges, isolated islands and continental slopes. Kuroshio and eddy activities are responsible for the local anomalously enhanced mixing patches far away from the topography. Comparisons among seismic results, numerical simulations and eddy analyses suggest that the energy cascades downward from large‐scale motions to small‐scale turbulence via multiple mechanisms of tide‐topography interaction, flow‐topography interaction, and frontal instability around the island of Taiwan.
Wind Fetch and Direction Effects on Langmuir Turbulence in a Coastal Ocean
Authors: Wang Xingchi , Kukulka Tobias , Plueddemann Albert J. 
Published: April 2022

AbstractMixing processes in the upper ocean play a key role in transferring heat, momentum, and matter in the ocean. These mixing processes are significantly enhanced by wave‐driven Langmuir turbulence (LT). Based on a paired analysis of observations and simulations, this study investigates wind fetch and direction effects on LT at a coastal site south of the island Martha’s Vineyard (MA, USA). Our results demonstrate that LT is strongly influenced by wind fetch and direction in coastal oceans, both of which contribute to controlling turbulent coastal transport processes. For northerly offshore winds, land limits the wind fetch and wave development, whereas southerly winds are associated with practically infinite fetch. Observed and simulated two‐dimensional wave height spectra reveal persistent southerly swell and substantially more developed wind‐driven waves from the south. For oblique offshore winds, waves develop more strongly in the alongshore direction with less limited fetch, resulting in significant wind and wave misalignments. Observations of coherent near‐surface crosswind velocities indicate that LT is only present for sufficiently developed waves. The fetch‐limited northerly winds inhibit wave developments and the formation of LT. In addition to limited fetch, strong wind–wave misalignments prevent LT development. Although energetic and persistent, swell waves do not substantially influence LT activity during the observation period because these relatively long swell waves are associated with small Stokes drift shear. These observational results agree well with turbulence‐resolving large eddy simulations (LESs) based on the wave‐averaged Navier–Stokes equation, validating the LES approach to coastal LT in the complex wind and wave conditions.
Nitrogen Cycling Across a Salinity Gradient From the Pearl River Estuary to Offshore: Insight From Nitrate Dual Isotopes
Authors: Chen Fajin , Deng Ziyun , Lao Qibin , Bian Peiwang , Jin Guangzhe , Zhu Qingmei , Zhou Xin , Chen Chunqing 
Published: April 2022

AbstractDual isotope measurements were performed on nitrate (δ15N‐NO3− and δ18O‐NO3−) in the Pearl River Estuary (PRE) and the adjacent northern South China Sea (NSCS) to investigate nitrate sources and its biogeochemical processes during rainy season. Our results indicated that in the PRE, high nitrate levels were associated with the intense human activities in PRE delta, the sources of which included the reduced nitrogen (N) fertilizer (29%), SN (nitrate derived from soil N) (18%), manure and sewage (10%), and atmospheric deposition (7%). In the nearshore area, nitrate was characterized by relatively high δ15N‐NO3− and δ18O‐NO3− values suggestive of incomplete nitrate assimilation. Besides, nitrification might be significant in the intermediate and bottom waters due to ammonia release from remineralization of sinking and sedimented organic matter (OM). In the offshore area, nitrate was depleted due to nearly complete utilization, and δ15N‐NO3− and δ18O‐NO3− showed moderate values. In addition, δ18O‐NO3− exhibited a clear vertical gradient with a decrease from the surface to the bottom. A coupled nitrification‐denitrification process in sediment porewater was supposed, which left isotope imprints in bottom waters of the offshore area. In surface waters from the nearshore to the offshore area, although assimilation was the prominent process, the δ15N‐NO3− and δ18O‐NO3− relationship deviated from the 1:1 line, suggesting significant contribution of atmospheric deposition that increased offshore. Our study suggests the external source of nitrate shifts from anthropogenic nitrogen to atmospheric source in the continuous river–estuary–ocean system, and nitrification‐denitrification become more active as it goes seaward.
Coral holobiont cues prime Endozoicomonas for a symbiotic lifestyle
Authors: Pogoreutz Claudia , Oakley Clinton A , Rädecker Nils , Cárdenas Anny , Perna Gabriela , Xiang Nan , Peng Lifeng , Davy Simon K , Ngugi David K , Voolstra Christian R 
Published: April 2022

Abstract
Endozoicomonas are prevalent, abundant bacterial associates of marine animals, including corals. Their role in holobiont health and functioning, however, remains poorly understood. To identify potential interactions within the coral holobiont, we characterized the novel isolate Endozoicomonas marisrubri sp. nov. 6c and assessed its transcriptomic and proteomic response to tissue extracts of its native host, the Red Sea coral Acropora humilis. We show that coral tissue extracts stimulated differential expression of genes putatively involved in symbiosis establishment via the modulation of the host immune response by E. marisrubri 6c, such as genes for flagellar assembly, ankyrins, ephrins, and serpins. Proteome analyses revealed that E. marisrubri 6c upregulated vitamin B1 and B6 biosynthesis and glycolytic processes in response to holobiont cues. Our results suggest that the priming of Endozoicomonas for a symbiotic lifestyle involves the modulation of host immunity and the exchange of essential metabolites with other holobiont members. Consequently, Endozoicomonas may play an important role in holobiont nutrient cycling and may therefore contribute to coral health, acclimatization, and adaptation.
Stability improvement mechanism due to less charge accumulation in ternary polymer solar cells
Authors: Xue Dong , Saito Masahiko , Osaka Itaru , Marumoto Kazuhiro 
Published: April 2022

AbstractTernary polymer solar cells based on a thiazolothiazole-based polymer donor (PTzBT) and a fullerene acceptor (PC61BM) have attracted attention because they show high efficiency and stability by addition of a non-fullerene acceptor (ITIC). However, the performance improvement mechanism is not completely elucidated. Here, we show the stability improvement mechanism due to less charge accumulation in the PTzBT cells with ITIC using operando electron spin resonance from a microscopic viewpoint. We observed two correlations between device performance and number of spins (Nspin) under solar irradiation. One correlation is the decrease in short-circuit current and the Nspin increase in electrons on PC61BM and holes in PTzBT, where the ITIC addition causes the less these Nspin. The other correlation is the increase in open-circuit voltage and the Nspin decrease in holes in ZnO. These findings explain the stability improvement mechanism, showing the correlation between less charge accumulation and higher stability, which is valuable for the development of further efficient and stable polymer solar cells.