bluuebunny/crossref_metadata_2025 huggingface dataset:
The Shackles of Veto: On the American Parallel of Article 19 TFEU and Its Tension with Procedural Justice
Authors: Moussa Mohamed
Published: November 2023

Article 19 TFEU's unanimity requirement shares a striking similarity with a two-century old debate on voting and minority rights between the ‘father’ of the US Constitution, James Madison, and the ‘rebellious son’, John C. Calhoun. Madison made majority voting a necessary condition for impartial lawmaking and minority protection in multistate unions. Conversely, Calhoun sought to maintain the racial status quo through advocating for a competing unanimity-based structure. Minority protection in Article 19 TFEU aligns with Calhoun's model. This Article reassesses Article 19 TFEU through the foundational principles of constitutionalism underlying the US debate and shows their continued relevance for contemporary case law and minority protection in the EU. Particularly, it demonstrates, first, that Article 19 offends the impartiality principle of nemo judex in causa sua—no person should judge their own cause—which has long been a leitmotiv in Western constitutional theory. Second, it illustrates that unanimity causes de jure and de facto ramifications for ethnic and religious minorities in the EU. Last, the Article provides a theoretically grounded and comparatively informed argument to aid ongoing attempts for treaty amendment.
Markov capacity for factor codes with an unambiguous symbol
Authors: HAN GUANGYUE , MARCUS BRIAN , WU CHENGYU
Published: November 2023

In this paper, we first give a necessary and sufficient condition for a factor code with an unambiguous symbol to admit a subshift of finite type restricted to which it is one-to-one and onto. We then give a necessary and sufficient condition for the standard factor code on a spoke graph to admit a subshift of finite type restricted to which it is finite-to-one and onto. We also conjecture that for such a code, the finite-to-one and onto property is equivalent to the existence of a stationary Markov chain that achieves the capacity of the corresponding deterministic channel.
Turbulence-induced electrical discharges in charged particle-laden Martian boundary layers
Authors: Rahman Mustafa Mutiur , Saieed Ahmed , Hickey Jean-Pierre
Published: November 2023

Martian dust storms in the planetary boundary layer share many qualitative similarities to terrestrial sandstorms. Both of these turbulence-driven, particle-laden boundary layer flows are known to generate electric fields due to the transport of differentially charged particles; this charge separation can be strong enough to lead to dielectric breakdown in the form of sparks or lightning. Using wall-modelled large-eddy simulations supplemented with conservation of equations for the charged particle transport, representative simulations of neutrally stable Martian and terrestrial particle-laden boundary layer flows are compared. The simulations, albeit canonical in nature, provide evidence to support previous observations of the less frequent occurrence of lightning on Mars but a higher occurrence of localised electric discharge events due to the much lower breakdown potential. The rarefied Martian atmosphere impedes charged particle transport, resulting in a weaker electric field than the equivalent terrestrial sandstorm. The lower drag force in the rarefied Martian atmosphere means that the electrostatic force plays a more significant role in the particle transport, which results in a self-regulation of the electric field. The strongest Martian dust storms show evidence of significant breakdown events and these discharge events only occur very close to the ground despite the very large boundary layer on Mars.
Self-propulsion of an elliptical phoretic disk emitting solute uniformly
Authors: Zhu Guangpu , Zhu Lailai
Published: November 2023

Self-propulsion of chemically active droplets and phoretic disks has been studied widely; however, most research overlooks the influence of disk shape on swimming dynamics. Inspired by experimentally observed prolate composite droplets and elliptical camphor disks, we employ simulations to investigate the phoretic dynamics of an elliptical disk that emits solutes uniformly in the creeping flow regime. By varying the disk's eccentricity$e$and the Péclet number$Pe$, we distinguish five disk behaviours: stationary, steady, orbiting, periodic and chaotic. We perform a linear stability analysis (LSA) to predict the onset of instability and the most unstable eigenmode when a stationary disk transitions spontaneously to steady self-propulsion. In addition to the LSA, we use an alternative approach to determine the perturbation growth rate, illustrating the competing roles of advection and diffusion. The steady motion features a transition from a puller-type to a neutral-type swimmer as$Pe$increases, which occurs as a bimodal concentration profile at the disk surface shifts to a polarized solute distribution, driven by convective solute transport. An elliptical disk achieves an orbiting motion through a chiral symmetry-breaking instability, wherein it repeatedly follows a circular path while simultaneously rotating. The periodic swinging motion, emerging from a steady motion via a supercritical Hopf bifurcation, is characterized by a wave-like trajectory. We uncover a transition from normal diffusion to superdiffusion as eccentricity$e$increases, corresponding to a random-walking circular disk and a ballistically swimming elliptical counterpart, respectively.
Simulating higher-order fabric structure in a coupled, anisotropic ice-flow model: application to Dome C
Authors: Lilien David A. , Rathmann Nicholas M. , Hvidberg Christine S. , Grinsted Aslak , Ershadi M. Reza , Drews Reinhard , Dahl-Jensen Dorthe
Published: November 2023

Ice-crystal fabric can induce mechanical anisotropy that significantly affects flow, but ice-flow models generally do not include fabric development or its effect upon flow. Here, we incorporate a new spectral expansion of fabric, and more complete description of its evolution, into the ice-flow model Elmer/Ice. This approach allows us to model the effect of both lattice rotation and migration recrystallization on large-scale ice flow. The fabric evolution is coupled to flow using an unapproximated non-linear orthotropic rheology that better describes deformation when the stress and fabric states are misaligned. These improvements are most relevant for simulating dynamically interesting areas, where recrystallization can be important, tuning data are scarce and rapid flow can lead to misalignment between stress and fabric. We validate the model by comparing simulated fabric to ice-core and phase-sensitive radar measurements on a transect across Dome C, East Antarctica. With appropriately tuned rates for recrystallization, the model is able to reproduce observations of fabric. However, these tuned rates differ from those previously derived from laboratory experiments, suggesting a need to better understand how recrystallization acts differently in the laboratory compared to natural settings.
Musical perception skills predict speech imitation skills: differences between speakers of tone and intonation languages
Authors: Li Peng , Zhang Yuan , Baills Florence , Prieto Pilar
Published: November 2023

The ability to imitate speech is linked to individual cognitive abilities such as working memory and the auditory processing of music. However, little research has focused on the role of specific components of musical perception aptitude in relation to an individual’s native language from a crosslinguistic perspective. This study explores the predictive role of four components of musical perception skills and working memory on phonetic language abilities for speakers of two typologically different languages, Catalan (an intonation language) and Chinese (a tone language). Sixty-one Catalan and 144 Chinese participants completed four subtests (accent, melody, pitch and rhythm) of the Profile of Music Perception Skills, a forward digit span task and a speech imitation task. The results showed that for both groups of participants, musical perception skills predicted speech imitation accuracy but working memory did not. Importantly, among the components of musical perception skills, accent was the only predictive factor for Chinese speakers, whereas melody was the only predictive factor for Catalan speakers. These findings suggest that speech imitation ability is predicted by musical perception skills rather than working memory and that the predictive role of specific musical components may depend on the phonological properties of the native language.
Comprensión del homicidio en las ciudades capitales colombianas. Un estudio de vulnerabilidad
Authors: Jiménez-García Williams Gilberto , Arenas-Valencia Wilson , Bohorquez-Bedoya Natalia
Published: November 2023

El presente artículo examina el fenómeno del homicidio en Colombia y busca comprender las condiciones de vulnerabilidad que afectan al homicidio en las ciudades colombianas. A través de un enfoque teórico y metodológico basado en la vulnerabilidad se analizó dicha relación entre la violencia homicida con los mercados ilegales, los mercados laborales pauperizados y la repartición de la riqueza. La muestra se compuso de las treinta y dos ciudades capitales departamentales de Colombia. Se usaron herramientas estadísticas multivariadas (PLS-SEM) para analizar la relación entre estos factores y el homicidio. Los hallazgos sugieren que los bajos ingresos, la falta de empleo, la desigualdad y la violencia están asociados con un mayor riesgo de homicidio.
ADAM SMITH, COLONIALISM, AND LIBERAL IMPERIALISM
Authors: Williams David
Published: November 2023

Adam Smith had a longstanding interest in colonialism and more generally relations between Europe and the rest of the world. It was through engagement with these issues that he worked through some of the central elements of his thought. This paper examines both Smith’s contexts and our own and argues that Smith’s work provides an important resource for reflecting today on relations with distant and diverse others today. It identifies three aspects of Smith’s thought that are particularly relevant: the political and economic costs of colonial ventures to the colonisers themselves, the question of whether and how imperialism had encouraged ‘progress’, and the question of how social and cultural differences should be understood and judged. The paper teases out Smith’s sometimes uncertain arguments in these areas and suggests that they can contribute to our own reflections on the troubled practices of liberal imperialism.
Implementation Matters: Evaluating the Proportional Hazard Test’s Performance
Authors: Metzger Shawna K.
Published: November 2023

Political scientists commonly use Grambsch and Therneau’s (1994, Biometrika 81, 515–526) ubiquitous Schoenfeld-based test to diagnose proportional hazard violations in Cox duration models. However, some statistical packages have changed how they implement the test’s calculation. The traditional implementation makes a simplifying assumption about the test’s variance–covariance matrix, while the newer implementation does not. Recent work suggests the test’s performance differs, depending on its implementation. I use Monte Carlo simulations to more thoroughly investigate whether the test’s implementation affects its performance. Surprisingly, I find the newer implementation performs very poorly with correlated covariates, with a false positive rate far above 5%. By contrast, the traditional implementation has no such issues in the same situations. This shocking finding raises new, complex questions for researchers moving forward. It appears to suggest, for now, researchers should favor the traditional implementation in situations where its simplifying assumption is likely met, but researchers must also be mindful that this implementation’s false positive rate can be high in misspecified models.
BAYESIAN MODELING OF A PERIPHERAL MIDDLE BRONZE AGE SETTLEMENT AT ZAHRAT ADH-DHRA‘ 1, JORDAN
Authors: Fall Patricia L , Ridder Elizabeth , Pilaar Birch Suzanne E , Falconer Steven E
Published: November 2023

Analysis of 20 calibrated accelerator mass spectrometry radiocarbon (AMS14C) ages reveals a chronology for the habitation of a unique peripheral settlement at Zahrat adh-Dhra‘ 1 (ZAD 1), Jordan during the Middle Bronze Age of the Southern Levant. Bayesian modeling distinguishes three phases of occupation between the first settlement at ZAD 1, perhaps as early as about 2050 cal BCE, and its abandonment by 1700 cal BCE. ZAD 1 represents a marginal community, both environmentally and culturally, on the hyperarid Dead Sea Plain, and exemplifies the peripheral settlements that are envisioned as important elements of Bronze Age Levantine society. Most importantly for this study, it is the only peripheral site in the Southern Levant that provides a Bayesian model for its habitation during the growth of Middle Bronze Age urbanized society. The timing of ZAD 1’s constituent phases, early in Middle Bronze I, across the Middle Bronze I/II transition and in Middle Bronze II, correspond well with emerging chronologies for the Middle Bronze Age, thereby contributing to an ongoing reassessment of regional social and settlement dynamics.
“Utopia shut up shop”: Hopeless Futures, Populism, and the American Dream
Authors: Sendroiu Ioana
Published: November 2023

This article considers the political implications of temporal orientations, building on Reinhart Koselleck’s conceptual histories of “progress” and “utopia”. A computational analysis of survey data from the 2016 US election provides a snapshot of the breakdown of the American Dream for some respondents, and its continued relevance for others. Rather than progress from past to future, data shows negative perceptions of the past or present associated with negative expectations for the future, a link especially pronounced among white respondents and those who subscribe to “America first” beliefs. At the same time, to the extent that racial privilege is inversely related to expectations of future progress, the findings suggest that utopian narratives of progress can help smooth over injustice or inequality with view to a better future. Expectations of progress are thus tightly woven into perceptions of injustice or marginalization.
The Trap of “Capitalism”, Racial or Otherwise
Authors: Bhambra Gurminder K. , Holmwood John
Published: November 2023

Loïc Wacquant’s essay, “The Trap of ‘Racial Capitalism’”, asks whether the term is “a conceptual solution or a conceptual problem”. His answer is forthright. He argues that racial capitalism has no place in a properly defined and understood social science. In this contribution, we set out the limitations, as we perceive them, of Wacquant’s own analysis and, at the same time, discuss other difficulties of the idea of racial capitalism. These, we suggest, are associated with an absence common to Wacquant and the major proponents of racial capitalism alike; namely, a failure to reckon systematically with the ways in which modern capitalism arises and develops within the global structures of European colonialism.
ON ENDOMORPHISMS OF EXTENSIONS IN TANNAKIAN CATEGORIES
Authors: ESKANDARI PAYMAN
Published: November 2023

We prove analogues of Schur’s lemma for endomorphisms of extensions in Tannakian categories. More precisely, let
$\mathbf {T}$
be a neutral Tannakian category over a field of characteristic zero. Let E be an extension of A by B in
$\mathbf {T}$
. We consider conditions under which every endomorphism of E that stabilises B induces a scalar map on
$A\oplus B$
. We give a result in this direction in the general setting of arbitrary
$\mathbf {T}$
and E, and then a stronger result when
$\mathbf {T}$
is filtered and the associated graded objects to A and B satisfy some conditions. We also discuss the sharpness of the results.
Seeking employment as an Irish English-language teacher in South Korea
Authors: Chesnut Michael , Schmitt Trevor
Published: November 2023

‘Hello Katie, I am sorry to inform you that my client does not hire Irish people due to the alcoholism [sic] nature of your kind.’ (Fox News, November 10, 2014)

The above message, sent to an Irish woman applying to teach English in South Korea in 2014 and shared widely in the media (Fox News, November 10, 2014; McCauley, 2014; Taylor, 2014) demonstrates that issues of nationality can shape the hiring of ‘foreign’ English teachers in East Asia. To better understand these issues, this study examines Irish English-language teachers’ experiences and understandings of seeking employment in Korea through interviews with six Irish English-language teachers who taught in Korea. Only one teacher explicitly stated he was discriminated against on the basis of being Irish, with three others discussing discrimination in ways which avoided explicitly taking a position regarding discrimination against Irish English-language teachers. Two participants explicitly stated they never experienced discrimination on the basis of being Irish, but surprisingly also discussed experiences in which their employment opportunities were limited due to being Irish. Additionally, certain aspects of Irish English and the desire in Korea for American English and American curriculum were identified as potential limitations on Irish English-language teachers’ employment opportunities in Korea.
Better than nothing: On defining the valence of a life
Authors: Brown Campbell
Published: November 2023

The valence of a life – that is, whether it is good, bad or neutral – is an important consideration in population ethics. This paper examines various definitions of valence. The main focus is ‘temporal’ definitions, which define valence in terms of the ‘shape’ of a life’s value over time. The paper argues that temporal definitions are viable only with a restricted domain, and therefore are incompatible with certain substantive theories of well-being. It also briefly considers some popular non-temporal definitions, and raises some problems for these.
Risk and resilience in Syrian refugee children: A multisystem analysis
Authors: Smeeth Demelza , May Andrew K. , Karam Elie G. , Rieder Michael J. , Elzagallaai Abdelbaset A. , van Uum Stan , Pluess Michael
Published: November 2023

Refugee children are often exposed to substantial trauma, placing them at increased risk for mental illness. However, this risk can be mitigated by a capacity for resilience, conferred from multiple ecological systems (e.g., family, community), including at an individual biological level. We examined the ability of hair cortisol concentrations and polygenic scores for mental health to predict risk and resilience in a sample of Syrian refugee children (n= 1359). Children were categorized as either at-risk or resilient depending on clinical thresholds for posttraumatic stress disorder, depression, and externalizing behavior problems. Logistic regression was used to examine main and interacting effects while controlling for covariates. Elevated hair cortisol concentrations were significantly associated with reduced resilience (odds ratio (OR)=0.58, 95%CI [0.40, 0.83]) while controlling for levels of war exposure. Polygenic scores for depression, self-harm, and neuroticism were not found to have any significant main effects. However, a significant interaction emerged between hair cortisol and polygenic scores for depression (OR=0.04, 95%CI [0.003 0.47]), suggesting that children predisposed to depression were more at risk for mental health problems when hair cortisol concentrations were high. Our results suggest that biomarkers (separately and in combination) might support early identification of refugee children at risk for mental health problems.
Visible Wealth in Past Societies: A Case Study of Domestic Architecture from the Hawaiian Islands
Authors: McCoy Mark D. , Panuska Joseph L.
Published: November 2023

Domestic architecture is increasingly revisited as a source of data about wealth inequality in the distant past via the Gini coefficient, a statistical tool often used in economics to compare income inequality. Many areas—including South America, Africa, South Asia and Oceania—remain under-sampled, making it difficult to develop a more complete picture of ancient political economies. In this paper we present a first look at this measure in the Hawaiian Islands. These data show that during the period prior to contact with Europeans inequality was extremely high, most similar to autocratic archaic states. We also found geographic patterning that may ultimately be linked to dryland (non-irrigated) farming. On islands reliant on dryland farming (Mau‘i, Hawai‘i), we find distinctively less inequality than elsewhere, or larger house sizes. We hypothesize these may have been innovations in how wealth was made visible to create and maintain cooperation in places where more labour would have been required to grow surplus. More research is necessary to test this hypothesis, investigate alternative interpretations, and to put these findings in larger regional context within Polynesia.
Morphological diversity of ancho chile pepper landraces from Mexico
Authors: Toledo-Aguilar Rocío , López-Sánchez Higinio , López Pedro Antonio , Aguilar-Rincón Víctor Heber , Vaquera-Huerta Humberto , Santacruz-Varela Amalio , González-Hernández Víctor Arturo , López-Pérez Adolfo , Hernández-Galeno César del A. , Ramírez-Meraz Moisés
Published: November 2023

Ancho (width) chile peppers have economic, social, culinary and cultural importance in Mexico and worldwide. This chile type considers divergent subtypes that altogether have not been analysed and therefore their morphological diversity has not been systematically described. The objectives were to describe the morphological diversity of ancho pepper landraces from Mexico, to identify groups of similarity and to define the traits with the higher contribution to the total variation. Eighty-six landraces of ancho chile peppers (red, ‘mulatos’, ‘miahuatecos’, ‘cristalinos’ and ‘huacle’), collected in six states of Mexico, and two commercial controls were evaluated in two localities, in a simple randomized complete block experimental design. We recorded 76 morphological traits. Statistical analysis included a combined ANOVA, Pearson's correlation coefficient, discriminant analysis, principal components and clusters. The morphological diversity in ancho chile peppers was mainly made up of fruit width, fruit wall thickness, stem diameter, corolla length, seed weight per fruit, plant height, stem length and pubescence. We defined four groups, which made it possible to differentiate ancho chile peppers of Puebla and the huacle chile pepper of Oaxaca from populations collected in the north and ‘Bajío’ (midland) parts of Mexico. Ancho chile peppers of Mexico showed wide morphological differences according to the type of chile pepper and seed collection regions. The traits that contributed the greatest morphological diversity were fruit width, fruit wall thickness, stem diameter, corolla length, seed weight per fruit, plant height, stem length and pubescence.
Changing trends in the global burden of mental disorders from 1990 to 2019 and predicted levels in 25 years
Authors: Wu Yang , Wang Lu , Tao Mengjun , Cao Huiru , Yuan Hui , Ye Mingquan , Chen Xingui , Wang Kai , Zhu Chunyan
Published: November 2023

Aims

The burden of mental disorders is increasing worldwide, thus, affecting society and healthcare systems. This study investigated the independent influences of age, period and cohort on the global prevalence of mental disorders from 1990 to 2019; compared them by sex; and predicted the future burden of mental disorders in the next 25 years.

Methods

The age-specific and sex-specific incidence of mental disorders worldwide was analysed according to the general analysis strategy used in the Global Burden of Disease Study in 2019. The incidence and mortality trends of mental disorders from 1990 to 2019 were evaluated through joinpoint regression analysis. The influences of age, period and cohort on the incidence of mental disorders were evaluated with an age–period–cohort model.

Results

From 1990 to 2019, the sex-specific age-standardized incidence and disability-adjusted life years (DALY) rate decreased slightly. Joinpoint regression analysis from 1990 to 2019 indicated four turning points in the male DALY rate and five turning points in the female DALY rate. In analysis of age effects, the relative risk (RR) of incidence and the DALY rate in mental disorders in men and women generally showed an inverted U-shaped pattern with increasing age. In analysis of period effects, the incidence of mental disorders increased gradually over time, and showed a sub-peak in 2004 (RR, 1.006 for males; 95% CI, 1.000–1.012; 1.002 for women, 0.997–1.008). Analysis of cohort effects showed that the incidence and DALY rate decreased in successive birth cohorts. The incidence of mental disorders is expected to decline slightly over the next 25 years, but the number of cases is expected to increase.

Conclusions

Although the age-standardized burden of mental disorders has declined in the past 30 years, the number of new cases and deaths of mental disorders worldwide has increased, and will continue to increase in the near future. Therefore, relevant policies should be used to promote the prevention and management of known risk factors and strengthen the understanding of risk profiles and incidence modes of mental disorders, to help guide future research on control and prevention strategies.
Allelopathic effects of aqueous extracts from uncomposted and composted Mexican devil (Ageratina adenophora) plants on forest fungal growth and soil nitrogen and phosphorus mobilization
Authors: Jiao Yujie , Huang Jianguo
Published: November 2023

Mexican devil [Ageratina adenophora (Spreng.) R.M. King & H. Rob.], a globally invasive weed with destructive effects on forests, has spread to numerous countries. To elucidate the inhibition of tree growth by A. adenophora, a study was conducted using the fungi (Lactarius deliciosus, Ceriporia lacerata, and Fomitopsis palustris) involved in the recycling of carbon and nutrients in forests. The focus was on investigating soil nitrogen and phosphorus availability in response to aqueous extracts from uncomposted and aerobically composted A. adenophora (EUA and ECA, respectively). The samples of composted A. adenophora from different sites exhibited a significant reduction in the concentration of allelochemicals 4,7-dimethyl-1-(propan-2-ylidene)-1,4,4a,8a-tetrahydronaphthalene-2,6(1H, 7H)-dione and 6-hydroxy-5-isopropyl-3,8-dimethyl-4a,5,6,7,8,8a-hexahydronaphthalen-2(1H)-one. This reduction more than 94% when compared with the concentration of these allelochemicals in CA. The EUA solutions at 5 and 10 mg L−1 (oven-dried plant biomass base) minimized L. deliciosus and C. lacerata growth, and significantly decreased F. palustris growth on the soil surface and within the soil. However, soil with ECA had no effect or promoting effect on the fungal growth. Compared with CK (only fungal inoculation in tested soil), the EUA solution reduced soil nitrogen and phosphorus, while ECA had the opposite effect; soil pH was increased by 0.01 to 0.08 under EUA treatment, while it decreased by 0.5 to 0.41under ECA treatment. Nitrogen and phosphorus availability were positively correlated with protease and phosphatase activity (r = 0.723 to 0.944), while available phosphorus was inversely correlated with pH in tested soils (r = -(0.809 to 0.978)). As such, the EUA solution decreased soil nitrogen and phosphorus supplies by inhibiting the liberation of proteases, phosphatases, and protons, which may lead to poor growth or even mortality of three fungal species. The in situ aerobically composted A. adenophora residues left behind may directly supply fungal species with nutrients and indirectly increase soil nutrient availability via the promotion of nitrogen and phosphorus mobilization.
The Migration of the Erosion Center Downstream of the Three Gorges Dam, China, and the Role Played by Underlying Gravel Layer
Authors: Zheng Shan , An Chenge , Wang Hualin , Li Lingyun , Wang Fei , Hassan Marwan A.
Published: November 2023

Rivers disrupted by sediment cutoff often experience degradation, but the migration of the erosion center, defined as the location with the greatest degradation rates, has not been thoroughly understood. This paper focuses on the streamwise migration of the erosion center along the ∼400‐km‐long Yichang to Chenglingji reach (YCR) downstream of the Three Gorges Dam (TGD), China. We analyzed channel morphological adjustment based on water, sediment and channel geometry data collected during 2002–2020. Based on the location and time for the occurrence of relatively large channel degradation, a clustering algorithm was used to identify the location of the erosion center. Characteristics and morphodynamic controls of the erosion centers were studied based on the migration of incisional and coarsening waves simulated by a one‐dimensional morphodynamic model for nonuniform sediment. Results show that the erosion center migrated downstream along the Yichang‐Zhicheng reach with gravel‐sand bed during 2002–2012, the migration rate was rapid after the dam closure then decreased with time. After ∼2012, large cascade dams started to operate along the upper Yangtze River, sediment load further decreased and degradation accelerated at the YCR. Correspondingly, the erosion center migrated to the sand‐bedded upper Jingjiang reach with faster rates. The erosion center migrated for a total of over 200 km with an average rate of ∼14 km/yr during 2002–2020. The underlying gravel layer was exposed due to degradation, which enhanced bed coarsening and resulted in the propagation of the erosion center downstream of the TGD.
Seasonal and Storm Event‐Based Dynamics of Dissolved Organic Carbon (DOC) Concentration in a Mediterranean Headwater Catchment
Authors: Senatore Alfonso , Corrente Giuseppina A. , Argento Eugenio L. , Castagna Jessica , Micieli Massimo , Mendicino Giuseppe , Beneduci Amerigo , Botter Gianluca
Published: November 2023

This study investigates the spatial and temporal dynamics of Dissolved Organic carbon (DOC) concentration in a Mediterranean headwater catchment (Turbolo River catchment, southern Italy) equipped with two multi‐parameter sondes providing more than two‐year (May 2019–November 2021) continuous high‐frequency measurements of several DOC‐related parameters. The sondes were installed in two nested sections, a quasi‐pristine upstream sub‐catchment and a downstream outlet with anthropogenic water quality disturbances. DOC estimates were achieved by correcting the fluorescent dissolved organic matter—fDOM—values through an original procedure not requiring extensive laboratory measurements. Then, DOC dynamics at the seasonal and storm event scales were analyzed. At the seasonal scale, results confirmed the climate control on DOC production, with increasing background concentrations in hot and dry summer months. The hydrological regulation proved crucial for DOC mobilization and export, with the top 10th percentile of discharge associated with up to 79% of the total DOC yield. The analysis at the storm scale using flushing and hysteresis indices highlighted substantial differences between the two catchments. In the steeper upstream catchment, the limited capability of preserving hydraulic connection over time with DOC sources determined the prevalence of transport as the limiting factor to DOC export. In the downstream catchment, transport‐ and source‐limited processes were observed almost equally. The correlation between the hysteretic behavior and antecedent precipitation was not linear since the process reverted to transport‐limited for high accumulated rainfall values. Exploiting high‐resolution measurements, the study provided insights into DOC export dynamics in nested headwater catchments at multiple time scales.
Interactions Between Lightning and Ship Traffic
Authors: Peterson Michael
Published: November 2023

It is important to understand connections between society and the natural environment for anticipating hazards and anthropogenic effects on the Earth system. In this study, we conduct a detailed exploration of interactions between oceanic thunderstorms and maritime traffic. Shipping traffic produces aerosols that perturb the otherwise “clean” ocean environment. Prior work proposed these aerosol effects as the cause of increased lightning over certain shipping lanes. However, introducing tall grounded objects into a high electric field environment might also facilitate lightning discharges, as we see with upward lightning over land. We consider both possibilities. Our analyses of the thunderstorms responsible for enhanced lightning activity over the shipping lane with the clearest anthropogenic signal indicate that the enhancement results from an increased frequency of lightning‐producing storms. Observed variations in thunderstorm microphysics between the shipping lane and nearby oceans are small compared to natural factors such as the Indian monsoon, and are on the same scale as the local variability in the data. By contrast, matching lightning stroke data with ship transponder events in oceanic regions where public data are available reveals a strong signal from direct ship interactions. Lightning is 15× (66×) more likely to occur at a ship location compared to 2 km (25 km) away. These results highlight the central role of direct ship interactions in explaining lightning enhancements over shipping lanes. We also document the frequency of these direct lightning interactions across various categories of vessels and on individual ships present in the public data.
Pervasive Crustal Volcanic Mush in the Highly Stretched Sunda Plate Margin of Northern Sumatra
Authors: Feng Mingye , Wei Shengji , Chen Ling , Muksin Umar , Lythgoe Karen , Wang Tuo , Wu Zimu
Published: November 2023

Arc volcanism, crustal deformation, and their interplay are poorly understood in northwestern Sumatra. Traditional receiver function H‐κ stacking studies constrain the variations in crustal thickness and Vp/Vs ratio in volcanic zones but rarely estimate the melt fractions. Here, we propose a H‐Φ stacking method, a variant of the H‐κ stacking method, and apply it to the dense nodal array data from Aceh, northern Sumatra, to estimate crustal thickness, Vp/Vs ratio, and melt fraction. Most results show considerably high Vp/Vs ratios (∼1.98) and melt fractions (up to 19%), indicating pervasive crustal magmatic mush. The northwestern edge of the Aceh crust is much thinner (∼22 km) than extended crust globally, reflecting a highly stretched crust due to tectonic processes governing the opening of the Andaman Sea. This thin crust and high melt fractions explain the Bouguer gravity anomaly, and partly explain the northward migration of Quaternary volcanics.
Global Cooling‐Driven Summer Monsoon Weakening in South China Across the Eocene‐Oligocene Transition
Authors: Jiao Wenjun , Wan Shiming , Li Yong‐Xiang , Zhao Debo , Liu Chang , Jin Hualong , Li Mengjun , Yu Zhaojie , Zhang Jin , Pei Wenqiang , Li Anchun
Published: November 2023

Recent research has suggested that East Asia has experienced a prevailing monsoon climate since the Eocene. However, there is little knowledge about the development of the East Asian monsoon system before the Miocene, particularly in southern China, due to a lack of well‐dated continuous sediment records. Here, we present new magnetic proxy records from International Ocean Discovery Program Site U1501 in the northern South China Sea. We conducted rock magnetic experiments, made scanning electron microscopy observations and performed diffuse reflectance spectrum analysis on the late Eocene‐early Oligocene core sediments. The magnetic signal of the sediments is dominated by detrital magnetite and titanomagnetite formed during the silicate weathering and erosion processes, which were used to infer the evolution of summer monsoon precipitation in southern China. Our results along with geochemical and clay mineral data from Site U1501 strongly indicate that the East Asian summer monsoon generally weakened across the Eocene‐Oligocene transition. This change was linked to coeval global cooling rather than tectonic processes. Prior to the Eocene‐Oligocene transition, the summer monsoon intensified, likely due to the latest Eocene warming event caused by the enhancement of the Atlantic Meridional Overturning Circulation, which may have preconditioned the Earth system for the greenhouse‐to‐icehouse transition.
Negative Excursion of Surface Electric Fields During Gamma‐Ray Glows in Winter Thunderstorms
Authors: Wada Y. , Kamogawa M. , Kubo M. , Enoto T. , Hayashi S. , Sawano T. , Yonetoku D. , Tsuchiya H.
Published: November 2023

During the 2020–2021 winter season, we detected 6 gamma‐ray glows at Kanazawa University, Japan. Negative surface electric fields (E‐fields; in the sign convention of atmospheric electricity) were observed by a field mill during all the glow cases. In five of the six cases, the peak E‐field reached around −12 kV m−1, and the E‐field during the glow detection was the strongest in the interval including 3 hr before and after the detection time. Therefore, negative charges should have been dominant in the thunderclouds that produced the gamma‐ray glows, and electrons were probably accelerated and multiplied by the E‐fields between a predominantly negative charge layer and a localized positive charge layer below. In addition, we extracted 8 non‐detection cases in the 2020–2021 winter season, in which surface E‐fields were stronger than −12 kV m−1. In 5 of the 8 cases, radar echoes were inadequately developed, suggesting insufficient charge accumulation. On the other hand, the remaining 3 cases had well‐developed radar echoes, and there was no significant difference from the detection cases.
Sand, Gravel, Cobbles, and Boulders: Detrital Thermochronology Shows that One Size Does Not Tell All
Authors: Lukens C. E. , Riebe C. S. , Sklar L. S. , Shuster D. L.
Published: November 2023

Detrital thermochronology has been used to measure sediment source elevations, and thus to quantify spatial variations in sediment production and erosion in steep mountain catchments. Samples commonly include a small fraction of the sediment sizes present on mountain streambeds, which according to previous modeling may not adequately represent sediment production where hillslope sediment sizes vary or where sediment breaks down during transport. Here we explore what can be learned from multiple sizes by quantifying source elevation distributions for 12 sediment size classes collected from Inyo Creek in the eastern Sierra Nevada, California. To interpret these data, we use a new analytical framework that identifies both the elevations where sediment sources deviate from catchment hypsometry and the likelihood that observed cumulative deviations could occur by chance. We find that sediment in four gravel and cobble size classes originates preferentially from higher elevations, either because erosion rates are faster or because these sizes are disproportionately represented in the sediment from high elevations. Conversely, boulders in the stream originate mostly from low elevations near the sample point, possibly reflecting the breakdown of boulders from high elevations during transport. While source elevations of finer sediment sizes are statistically indistinguishable from hypsometry, we show that these sizes are unlikely to be consistent with uniform sediment production because they cannot be considered in isolation from the coarser sizes. Our source elevation distributions from sand, gravel, cobbles, and boulders show that no one size can tell the rich story of sediment production and evolution, and highlight opportunities for future work.
A Universal Predictor‐Corrector Approach for Minimizing Artifacts Due To Mesh Refinement
Authors: Du Shukai , Stechmann Samuel N.
Published: November 2023

With nested grids or related approaches, it is known that numerical artifacts can be generated at the interface of mesh refinement. Most of the existing methods of minimizing these artifacts are either problem‐dependent or numerical methods‐dependent. In this paper, we propose a universal predictor‐corrector approach to minimize these artifacts. By its construction, the approach can be applied to a wide class of models and numerical methods without modifying the existing methods but instead incorporating an additional step. The idea is to use an additional grid setup with a refinement interface at a different location, and then to correct the predicted state near the refinement interface by using information from the other grid setup. We give some analysis for our method in the setting of a one‐dimensional advection equation, showing that the key to the success of the method depends on an optimized way of choosing the weight functions, which determine the strength of the corrector at a certain location. Furthermore, the method is also tested in more general settings by numerical experiments, including shallow water equations, multi‐dimensional problems, and a variety of underlying numerical methods including finite difference/finite volume and spectral element. Numerical tests suggest the effectiveness of the method on reducing numerical artifacts due to mesh refinement.
Deep Seismic Reflection Imaging of Mesozoic Kachchh Rift, NW India: Implications for Evolution
Authors: Mandal Biswajit , Vijaya Rao V. , Karuppannan P. , Laxminarayana K. , Chopra Sumer , Ravi Kumar M. , Kumar Prakash
Published: November 2023

Deep crustal seismic reflection profiling is carried out for first time across various tectonic domains of seismically active Mesozoic Kachchh rift basin, formed during the breakup of Gondwanaland. The seismic data, processed using the common reflection surface stack approach, provided maiden images of the shallow and deep sub‐surface structures in the region. These images reveal a 15 km thick subhorizontal lower crustal reflection fabric and crustal‐scale domal‐type structure extending from the surface to the Moho. We interpret the earlier structure represent magmatic underplating and the latter as the Kachchh Mainland uplift. We find large variations in the thickness of sediments from 150 m to 6.5 km and crustal thickness from 45 to 35 km from north to south, with a Moho up warp of 4 km beneath the Kachchh Mainland fault. The Kachchh rift basin exhibits an unusually thick crust of 45 km, contrary to many rift basins. We interpret the syn‐rifting and the Reunion mantle plume activity, manifested as Deccan volcanics, are responsible for magmatic underplating and crustal thickening. Uplift in the region is multi‐genetic in origin. Present study illuminated new faults and nature of various other faults. Moderate to large earthquakes in the region are attributed to the regional and local stresses resulting from the plate boundary and heterogeneous crustal structure. Based on the mafic lower crust and distribution of aftershocks through the entire crust, we interpret the lower crust is brittle, contrary to most models of continental rheology.
A straightforward spectral emissivity estimating method based on constructing random rough surfaces
Authors: Zhang Zezhan , Chen Mengchao , Zhang Lichuan , Li Hongzu , Huang Hairui , Zhang Zilong , Yu Peifeng , Niu Yi , Gao Shan , Wang Chao , Jiang Jing
Published: November 2023

Spectral emissivity is an essential and sensitive parameter to characterize the radiative capacity of the solid surface in scientific and engineering applications, which would be non-negligibly affected by surface morphology. However, there is a lack of assessment of the effect of roughness on emissivity and a straightforward method for estimating the emissivity of rough surfaces. This paper established an estimating method based on constructing random rough surfaces to predict rough surface (Geometric region) emissivity for metal solids. Based on this method, the emissivity of ideal gray and non-gray body surfaces was calculated and analyzed. The calculated and measured spectral emissivities of GH3044, K465, DD6, and TC4 alloys with different roughness were compared. The results show that the emissivity increases with the roughness degree, and the enhancement effect weakens with the increase of roughness or emissivity due to the existing limit (emissivity ε = 1.0). At the same time, the roughness would not change the overall spectral distribution characteristics but may attenuate the local features of the spectral emissivity. The estimated results are in good agreement with the experimental data for the above alloys’ rough surfaces. This study provides a new reliable approach to obtaining the spectral emissivity of rough surfaces. This approach is especially beneficial for measuring objects in extreme environments where emissivity is difficult to obtain. Meanwhile, this study promotes an understanding of surface morphology’s effect mechanism on emissivity.
Fenofibrate alleviates insulin resistance by reducing tissue inflammation in obese ovariectomized mice
Authors: Lee Jungu , Jeon Suyeon , Lee Mijeong , Yoon Michung
Published: November 2023

Background

Fenofibrate is a hypolipidemic peroxisome proliferator-activated receptor α (PPARα) agonist used clinically to reduce hypercholesterolemia and hypertriglyceridemia.

Objective

We investigated the effects of fenofibrate on insulin resistance and tissue inflammation in a high-fat diet (HFD)-fed ovariectomized (OVX) C57BL/6J mice, a mouse model of obese postmenopausal women.

Methods

Female OVX mice were randomly divided into 3 groups and received a low-fat diet, an HFD, or an HFD supplemented with 0.05% (w/w) fenofibrate for 9 weeks. Parameters of insulin resistance and tissue inflammation were measured using blood analysis, histological analysis, immunohistochemistry, and quantitative real-time polymerase chain reaction.

Results

When fenofibrate was administered to HFD-fed OVX mice for 9 weeks, we observed reductions in body weight gain, adipose tissue mass, and the size of visceral adipocytes without the change of food intake. Fenofibrate improved mild hyperglycemia, severe hyperinsulinemia, and glucose tolerance in these mice. It also reduced pancreatic islet size and insulin-positive β-cell area to levels similar to those in OVX mice fed a low-fat diet. Concomitantly, administration of fenofibrate not only suppressed pancreatic lipid accumulation but also decreased CD68-positive macrophages in both the pancreas and visceral adipose tissue. Treatment with fenofibrate reduced tumor necrosis factor α (TNFα) mRNA levels in adipose tissue and lowered serum TNFα levels.

Conclusion

These results suggest that fenofibrate treatment attenuates insulin resistance in part by reducing tissue inflammation and TNFα expression in HFD-fed OVX mice.