bluuebunny/crossref_metadata_2025_split huggingface dataset:
Microstructural evolution and liquation cracking in the partially melted zone of deposited ERNiCrFe-13 filler metal subjected to TIG refusion
Authors: Guo X. , He P. , Xu K. , Chen P. Y. , Chen B. , Huo S. B. 
Published: February 2021

AbstractThe microstructure of ERNiCrFe-13 multipass weld metal has been shown to contain Laves/γ or σ/γ eutectic constituents that can increase susceptibility to solidification and weld metal liquation cracking resulting from the low eutectic reaction temperature. Under poor heat dissipation conditions such as on the edge of large thickness welded components, a partially melted zone (PMZ) may form in the weld metal during multipass welding. The microstructural evolution and liquation cracking susceptibility of this PMZ in ERNiCrFe-13 multipass welds have received little attention. In the present study, a tungsten inert gas (TIG) refusion process is used to simulate a thermal cycle with a long elevated temperature dwell time in order to investigate the microstructural evolution and liquation cracking in the weld metal PMZ. The results show that the eutectic microstructures in the PMZ evolve into three eutectic morphologies after TIG refusion, including long linear chains extending perpendicular to the boundary between the refusion zone and PMZ, skeletal structures, and fine lamellar networks. This evolution contributes to constitutional liquation occurring at the γ/Laves and γ/σ interface. Nb and Mo play a leading role in the constitutional liquation of γ/Laves and γ/σ eutectic microstructures, respectively. Liquation cracking in the PMZ is shown to occur along the linear chain grain boundaries resulting from constitutional liquation.
Smoothing additive manufactured parts using ns-pulsed laser radiation
Authors: Kuisat Florian , Lasagni Fernando , Lasagni Andrés Fabián 
Published: February 2021

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.
Modified sodium molybdate as an efficient high yielding heterogeneous catalyst for biodiesel from Ghanaian indigenous Camelina sativa as a non-edible resource
Authors: Takase Mohammed , Essandoh Paul Kwame , Kipkoech Rogers 
Published: February 2021

AbstractSodium molybdate (Na2MoO4) has been synthesized and investigated as a heterogeneous solid catalyst for biodiesel from Camelina sativa seed oil. Transesterification reactions occurred under atmospheric conditions with relatively, low temperature short reaction time and normal pressure. The prepared catalyst was characterised by means of SEM, TGA, UV, XRD and FTIR. The properties of the biodiesel were compared with international standards. The transesterification reaction was very efficient with the optimum yield higher than 95% at methanol to oil molar ratio of 17:1, catalyst amount of 6%, reaction temperature of 60 °C and reaction time of 2.5 h. The molybdate complex had a high Lewis acidity and most certainly act as alcohol O–H bond leading to a transient species which has high nucleophilic character. The catalyst was easily recovered and after being washed for three times, showed capacity of recyclability for another catalytic reaction of five cycles with similar activity. The properties of the biodiesel were comparable to international standards.
Parenting factors and meaning of life among Chinese adolescents: A six‐wave longitudinal study
Authors: Shek Daniel T.L. , Chai Catherine W.Y. , Dou Diya 
Published: February 2021

IntroductionUsing six‐wave data, the present study examined the influence of parent‐child subsystem relational qualities (indexed by parental behavioral control, psychological control, and parent‐child relationship) on the initial status and growth trajectory of meaning of life (MOL) in Chinese adolescents.MethodsA total of 2023 high school students in Hong Kong (M age = 12.53 ± 0.66 years, 48.0% male students) responded to a questionnaire measuring their perceived parent‐child subsystem relational qualities and meaning of life for six consecutive years from 2009/2010. Individual growth curve (IGC) analyses and multiple regression analyses were used.ResultsResults of IGC analyses showed that parental behavioral control and parent‐child relationship quality at Wave 1 positively predicted the initial level of adolescent MOL but negatively influenced the growth trajectory of MOL. Parental psychological control at the initial level negatively predicted the initial status of MOL but not the developmental trajectory of adolescent MOL. However, compared with adolescents experiencing poorer parent‐child relational subsystem qualities, adolescents with better parent‐child relational subsystem qualities showed significantly higher MOL at each time point. Multiple regression analyses also showed that while parent‐child relationship quality and paternal behavioral control concurrently and longitudinally exhibited positive predictions on adolescent MOL, the impact of parental psychological control on adolescent MOL showed different patterns in early and late adolescence.ConclusionsThe pioneering findings underline the important role of different parent‐child subsystem relational qualities in influencing adolescent MOL.
Benefit–Cost Analysis of Social Media Facilitated Bystander Programs
Authors: Ebers Axel , Thomsen Stephan L. 
Published: February 2021

AbstractBystander programs contribute to crime prevention by motivating people to intervene in violent situations. Social media allow addressing very specific target groups, and provide valuable information for program evaluation. This paper provides a conceptual framework for conducting benefit–cost analysis of bystander programs and puts a particular focus on the use of social media for program dissemination and data collection. The benefit–cost model treats publicly funded programs as investment projects and calculates the benefit–cost ratio. Program benefit arises from the damages avoided by preventing violent crime. We provide systematic instructions for estimating this benefit. The explained estimation techniques draw on social media data, machine-learning technology, randomized controlled trials and discrete choice experiments. In addition, we introduce a complementary approach with benefits calculated from the public attention generated by the program. To estimate the value of public attention, the approach uses the bid landscaping method, which originates from display advertising. The presented approaches offer the tools to implement a benefit–costs analysis in practice. The growing importance of social media for the dissemination of policy programs requires new evaluation methods. By providing two such methods, this paper contributes to evidence-based decision-making in a growing policy area.
Do Disabled Candidates Represent Disabled Citizens?
Authors: Reher Stefanie 
Published: February 2021

AbstractWhether citizens are better represented by politicians ‘like them’ has been the subject of much debate and analysis. Yet, this scholarship has largely ignored the 1 in 5 people who are disabled and experience economic, social and political marginalization. Linking voter and candidate data from the 2015 British general election, this study examines whether disabled citizens are better represented by disabled elites. It analyses the effects of disability on both preferences and preference congruence. The findings reveal that disabled citizens and candidates are more supportive of healthcare and general public spending, even within parties. At the same time, the views of disabled citizens are rarely more congruent with the positions of disabled candidates than those of non-disabled candidates, except on healthcare spending. The study provides ground-breaking insights into the role of disability in policy preferences and political representation while also highlighting broader implications of how the descriptive–substantive representation link is analysed.
Partisan Misalignment and the Counter-Partisan Response: How National Politics Conditions Majority-Party Policy Making in the American States
Authors: Miras Nicholas S. , Rouse Stella M. 
Published: February 2021

AbstractWhen one political party gains control of American national governing institutions, it increases the prospects of enacting its policy agenda. Faced with this partisan misalignment, the authors expect state governments controlled by the national out-party to respond to the national partisan context with more state policy activism. The study examines changes in state policy liberalism from 1974 to 2019, and finds that both Republican- and Democratic-controlled states have pushed policy further in their preferred ideological directions when the opposing party has greater partisan control over the national policy agenda in Washington. It also identifies differences between the two parties. While the effect of Republican control modestly increases as Democrats gain power at the national level, Democratic-controlled states have shown dramatically larger shifts in policy liberalism during periods of Republican national control. This arrangement, however, appears to be a contemporary one, emerging in the more polarized political environment since the mid-1990s.
HENRY VALOIS'S COURT AND ELECTIVE KINGSHIP IN THE POLISH–LITHUANIAN COMMONWEALTH, 1573–1574
Authors: KOSIOR KATARZYNA 
Published: February 2021

AbstractHenry Valois (1551–89) was elected king of the Polish–Lithuanian Commonwealth in 1573 and arrived in Poland in January 1574. After five months, Henry fled Poland–Lithuania upon inheriting the French throne from his brother, Charles IX. As Henry III of France, he was branded a violent tyrant, who allowed his mignons to run the kingdom and isolated himself from his subjects. Historians have done much to rehabilitate Henry's reputation, but his first experience of kingship in the Commonwealth has been neglected in these reassessments. This article uses the previously unstudied treasury accounts of Henry's Polish court to re-examine his experience of the Polish–Lithuanian elective, parliamentary monarchy as crucial to the development of his characteristic style of kingship and court. Some of these practices were a response to the challenges posed by the Polish political system to a newly elected king. This allows us to recover a lost political connection between Poland and France. Secondly, the article demonstrates Henry's active engagement in the Polish–Lithuanian politics, challenging the narrative that he was a passive king anticipating his return to Paris. Instead, Henry planned to cement his rule in Poland by mounting his own faction and pursuing a bold diplomatic agenda.
WARTIME AND POST-WAR RAPE IN FRANCO'S SPAIN
Authors: ALCALDE ÁNGEL 
Published: February 2021

AbstractBy examining the experience of rape in Spain in the 1930s and 1940s, this article explains how the Spanish Civil War and Franco's dictatorship dramatically increased the likelihood of women becoming victims of sexual assault. Contrary to what historians often assume, this phenomenon was not the result of rape being deliberately used as a ‘weapon of war’ or as a blunt method of political repression against women. The upsurge in sexual violence was a by-product of structural transformations in the wartime and dictatorial contexts, and it was the direct consequence, rather than the instrument, of the violent imposition of a fascist-inspired regime. Using archival evidence from numerous Spanish archives, the article historicizes rape in a wider cultural, legal, and social context and reveals the essential albeit ambiguous political nature of both wartime and post-war rape. The experience of rape was mostly shaped not by repression but structural factors such as ruralization and social hierarchization, demographic upheavals, exacerbation of violent masculinity models, the proliferation of weapons, and the influence of fascist and national-Catholic ideologies. Rape became an expression of the nature of power and social and gender relations in Franco's regime.
A new empirical equation to describe the vertical leaf distribution profile of maize
Authors: Fan P. P. , Li Y. Y. , Evers J. B. , Ming B. , Wang C. X. , Li S. K. , Xie R. Z. 
Published: February 2021

AbstractThe characteristic traits of maize (Zea mays L.) leaves affect light interception and photosynthesis. Measurement or estimation of individual leaf area has been described using discontinuous equations or bell-shaped functions. However, new maize hybrids show different canopy architecture, such as leaf angle in modern maize which is more upright and ear leaf and adjacent leaves which are longer than older hybrids. The original equations and their parameters, which have been used for older maize hybrids and grown at low plant densities, will not accurately represent modern hybrids. Therefore, the aim of this paper was to develop a new empirical equation that captures vertical leaf distribution. To characterize the vertical leaf profile, we conducted a field experiment in Jilin province, Northeast China from 2015 to 2018. Our new equation for the vertical distribution of leaf profile describes leaf length, width or leaf area as a function of leaf rank, using parameters for the maximum value for leaf length, width or area, the leaf rank at which the maximum value is obtained, and the width of the curve. It thus involves one parameter less than the previously used equations. By analysing the characteristics of this new equation, we identified four key leaf ranks (4, 8, 14 and 20) for which leaf parameter values need to be quantified in order to have a good estimation of leaf length, width and area. Together, the method of leaf area estimation proposed here adds versatility for use in modern maize hybrids and simplifies the field measurements by using the four key leaf ranks to estimate vertical leaf distribution in maize canopy instead of all leaf ranks.
Helminth-derived cystatins: the immunomodulatory properties of an Ascaris lumbricoides cystatin
Authors: Caraballo Luis , Zakzuk Josefina , Acevedo Nathalie 
Published: February 2021

AbstractHelminth infections such as ascariasis elicit a type 2 immune response resembling that involved in allergic inflammation, but differing to allergy, they are also accompanied with strong immunomodulation. This has stimulated an increasing number of investigations, not only to better understand the mechanisms of allergy and helminth immunity but to find parasite-derived anti-inflammatory products that could improve the current treatments of chronic non-communicable inflammatory diseases such as asthma. A great number of helminth-derived immunomodulators have been discovered and some of them extensively analysed, showing their potential use as anti-inflammatory drugs in clinical settings. Since Ascaris lumbricoides is one of the most successful parasites, several groups have focused on the immunomodulatory properties of this helminth. As a result, several excretory/secretory components and purified molecules have been analysed, revealing interesting anti-inflammatory activities potentially useful as therapeutic tools. One of these molecules is A. lumbricoides cystatin, whose genomic, cellular, molecular, and immunomodulatory properties are described in this review.
ICESat‐2 Elevation Retrievals in Support of Satellite‐Derived Bathymetry for Global Science Applications
Authors: Babbel Benjamin J. , Parrish Christopher E. , Magruder Lori A. 
Published: February 2021

AbstractBathymetry retrievals from 2D, multispectral imagery, referred to as Satellite‐Derived Bathymetry (SDB), afford the potential to obtain global, nearshore bathymetric data in optically clear waters. However, accurate SDB depth retrievals are limited in the absence of “seed depths.” The Ice, Cloud, and land Elevation Satellite‐2 (ICESat‐2) space‐based altimeter has proven capable of accurate bathymetry, but methods of employing ICESat‐2 bathymetry for SDB retrievals over broad spatial extents are immature. This research aims to establish and test a baseline methodology for generating bathymetric surface models using SDB with ICESat‐2. The workflow is operationally efficient (17–37 min processing time) and capable of producing bathymetry of sufficient vertical accuracy for many coastal science applications, with RMSEs of 0.96 and 1.54 m when using Sentinel‐2 and Landsat 8, respectively. The highest priorities for further automation have also been identified, supporting the long‐range goal of global coral reef habitat change analysis using ICESat‐2‐aided SDB.
Weakened ENSO‐Ningaloo Niño/Niña Teleconnection Under Greenhouse Warming
Authors: Liu Yi , Li Ziguang , Cai Wenju , Lin Xiaopei , Yang Jun‐Chao 
Published: February 2021

AbstractNingaloo Niño/Niña is a mode of climate variability in the southeastern Indian Ocean with huge impacts on Australian climate. El Niño‐Southern Oscillation (ENSO), as the dominant remote forcing, triggers Ningaloo Niño/Niña. However, how this teleconnection will respond to greenhouse warming is unclear. Using Coupled Model Intercomparison Project phase 5 (CMIP5) multimodel simulations, we find a weakened ENSO‐Ningaloo Niño/Niña teleconnection under greenhouse warming, which manifests as weakened atmospheric teleconnection from La Niña to Ningaloo Niño. Such weakened teleconnection can be linked to the tropical Pacific mean state changes including an El Niño‐like warming pattern and more stable atmosphere in the future climate, both suppressing the atmospheric convection in the western tropical Pacific, leading to a weaker Matsuno‐Gill response in the southeastern Indian Ocean. Our results suggest that Ningaloo Niño/Niña becomes more challenging to predict as greenhouse warming continues.
Electron‐Only Tail Current Sheets and Their Temporal Evolution
Authors: Hubbert M. , Qi Y. , Russell C. T. , Burch J. L. , Giles B. L. , Moore T. E. 
Published: February 2021

AbstractThe Earth's magnetotail contains a current sheet separating the anti‐Sunward field of the southern lobe from the sunward‐pointing northern lobe. Herein, we report tail current sheets that are supported only by electron currents. We examine one electron‐only current sheet in detail and briefly discuss 10 others. Three current sheets are interpreted in terms of the time‐evolution of reconnection onset. These current sheets show evidence of parallel electron heating, perpendicular ion heating, and current sheet expansion. These features are consistent with electron and ion behavior during traditional “electron‐ion” reconnection. Ground‐based and in‐situ data show that electron‐ion reconnection occurs shortly after each “pre‐ion reconnection” electron‐only reconnection event. This suggests that electron‐only reconnection can act as a precursor to electron‐ion reconnection. We note that five events occur shortly after a period of electron‐ion reconnection, which suggests that electron‐only reconnection is more than merely a precursor to ion reconnection.
Damaged Speleothems and Collapsed Karst Chambers Indicate Paleoseismicity of the NE Bohemian Massif (Niedźwiedzia Cave, Poland)
Authors: Szczygieł Jacek , Sobczyk Artur , Hercman Helena , Mendecki Maciej J. , Gąsiorowski Michał 
Published: February 2021

AbstractMultiphase speleothem damage and passage collapse in Niedźwiedzia Cave (NE Bohemian Massif, Poland) were dated with U‐series methods, revealing five events: (1) 320–306 ka, (2) 253–236 ka, (3) 162–158 ka, (4) 132–135 ka, and (5) >21 ka. Events 1, 3 and 4 are robustly constrained, and events 2 and 5 are less certain. Although we cannot unambiguously exclude other agents (frost or gravity collapses), the most likely trigger of damage in the cave was an earthquake, which is supported by timing (the damage occurred independently from climatic conditions in cold and warm periods) and deformation style (damage to the ceiling and walls as well as the passage floor). We applied ground motion models to determine the probable seismic source size, which is most likely the Sudetic Marginal Fault ‐ one of the most pronounced tectonic structures in Central Europe. Located <20 km from the cave and with documented earthquakes of M > 6, the Sudetic Marginal Fault can produce peak ground acceleration values high enough to break speleothems. The other plausible seismic sources are faults in the Upper Nysa Kłodzka Graben located to the east and the Trzebieszowice‐Biela Fault. Although there are sparse historical data that would allow estimating linked seismic hazards, the <8 km distance between the cave and faults should suffice to destroy the speleothems. Niedźwiedzia Cave shielded environmental earthquake effects from erosion. This study shows the advantage of employing speleoseismology in moderate seismic regions, where earthquake effects are rarely preserved in the geological record.
Improving Remotely Sensed River Bathymetry by Image‐Averaging
Authors: Legleiter C. J. , Kinzel P. J. 
Published: February 2021

AbstractBasic data on river bathymetry is critical for numerous applications in river research and management and is increasingly obtained via remote sensing, but the noisy, pixelated appearance of image‐derived depth maps can compromise subsequent analyses. We hypothesized that this noise originates from reflectance from an irregular water surface and introduced a framework for mitigating these effects by Inferring Bathymetry from Averaged River Images (IBARI). This workflow produces time‐averaged images from video frames stabilized to account for platform motion and/or computes a spatial average from an ensemble simulated by randomly shifting images relative to themselves. We used field observations of water depth and helicopter‐based videos from a clear‐flowing river to assess the potential of this approach to improve depth retrieval. Our results indicated that depths inferred from averaged images were more accurate and precise than those inferred from single frames; observed versus predicted regression R2 increased from 0.80 to 0.88. In addition, IBARI significantly enhanced the texture of image‐derived depth maps, leading to smoother, more coherent representations of channel morphology. Depth retrieval improved with image sequence duration, but the number of images was more important than the length of time encompassed; shorter acquisitions at higher frame rates would economize data collection. We also demonstrated the potential to scale up the IBARI workflow by producing a mosaic of bathymetric maps derived from averaged images acquired at several hovering waypoints distributed along a 2.36 km reach. This approach is well‐suited to data collected from helicopters and small unmanned aircraft systems.