bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Heat Treatment on Corrosion Behavior of S275 Mild Steel Using Accelerated DC Voltage, LPR, and EIS
Authors: Jacob Liyamol , Parapurath Shahid , Vahdati Nader , Gunister Ebru
Published: October 2024

This study used an external DC voltage of 1.5 V to accelerate corrosion in heat-treated S275 mild steel samples at different time intervals. LPR and EIS were used to study the corrosion behavior of original and quenched steel samples. There was only a negligible difference in the corrosion rate (CR) for the original and the quenched samples up to 30 min of voltage application in a 3.5% NaCl electrolyte media. When the exposure time increased to 60 min, the original sample showed seven times higher CR than the quenched samples. The pits on the surface of the original samples acted as cathodes, enhancing the reaction rate on the surface and increasing its CR dramatically. This led to bimodal corrosion, where the first part is led by concentration and diffusion; while, the second part is led by localized corrosion. The smaller pits on the original surface samples served as cathodic reaction centers, exacerbating corrosion. The corrosion rate of the original samples ranged from 0.8 to 7.8 mmpy; whereas, the corrosion rate of the quenched samples remained consistently around 0.8 mmpy. This trend can be observed in long-term corrosion in different metals. The uniformly oriented martensitic microstructure and the quenched samples’ small grain size prevented the enhanced ion penetration due to applied voltage. This study analyses the long-term stability of structural steel samples in marine environments by accelerating the corrosion rate by an applied external DC voltage.
Epidemiological changes and outcomes of people living with HIV admitted to the intensive care unit: a 14-year retrospective study
Authors: Martínez Esther , Foncillas Alberto , Téllez Adrián , Fernández Sara , Martínez-Nadal Gemma , Rico Verónica , Tomé Adrià , Ugarte Ainoa , Rinaudo Mariano , Berrocal Leire , De Lazzari Elisa , Miró Jose M. , Nicolás Jose M. , Mallolas Josep , De la Mora Lorena , Castro Pedro
Published: October 2024

Purposes

Since 2016, the World Health Organization has recommended universal antiretroviral therapy (ART) for all people living with Human Immunodeficiency Virus (PLHIV). This recommendation may have influenced the characteristics and outcomes of PLHIV admitted to the Intensive Care Unit (ICU). This study aims to identify changes in the epidemiological and clinical characteristics of PLHIV admitted to the ICU, and their short- and medium-term outcomes before and after the implementation of universal ART (periods 2006–2015 and 2016–2019).

Methods

This retrospective, observational, single-center study included all adult PLHIV admitted to the ICU of a University Hospital in Barcelona from 2006 to 2019.

Results

The study included 502 admissions involving 428 patients, predominantly men (75%) with a median (P25-P75) age of 47.5 years (39.7–53.9). Ninety-one percent were diagnosed with HIV before admission, with 82% under ART and 60% admitted from the emergency department. In 2016–2019, there were more patients on ART pre-admission, reduced needs for invasive mechanical ventilation (IMV) and fewer in-ICU complications. ICU mortality was also lower (14% vs 7%). Predictors of in-ICU mortality included acquired immunodeficiency syndrome defining event (ADE)-related admissions, ICU complications, higher SOFA scores, IMV and renal replacement therapy (RRT) requirement. ART use during ICU admission was protective. Higher SOFA scores, admission from hospital wards, and more comorbidities predicted one-year mortality.

Conclusions

The in-ICU mortality of critically ill PLHIV has decreased in recent years, likely due to changes in patient characteristics. Pre- and ICU admission features remain the primary predictors of short- and medium-term outcomes.
Dynamic Compression of Glass/Epoxy Composites: The Effects of Fibre Architecture & Ageing, and Use of Energy Flux as a Characterisation Tool
Authors: Perry J. I. , Williamson D. M.
Published: October 2024

Fibre-reinforced composites (FRPs) are strong, light and corrosion resistant. From marine to aerospace and space applications, potential benefits from wider use of high-strength FRPs include increased fuel efficiency and service life. However, they are also highly complex, with strongly anisotropic properties which depend not just on their constituents but also their meso- and micro-structural properties like fibre architecture and fibre-matrix bonding. Developing a more robust understanding of how they behave is therefore critical if we hope to use FRPs more. High-strain-rate loading conditions are of particular importance for composites, as their high specific strength makes them ideal for many applications involving rapid accelerations, which are often at risk of high-speed impact threats. Here, FRPs with similar fibre and matrix components, but differing fibre architectures, have been studied at loading rates of the order of 0.01/s and 1000/s under both ‘pristine’ condition and after ageing by full saturation in a demineralised water bath at 40 °C. Experiments were designed to ensure equilibrium is reached early in the deformation process to discern information about stiffness and toughness, and the use of energy flux is considered in terms of power and total work done to characterise both experimental conditions and material response.
Multiple agricultural risks and insurance—issues, perspectives, and illustration for wine-growing
Authors: Aubert Cécile , Raineau Yann , Raynal Marc , Pasquier Nicolas
Published: October 2024

Agricultural producers face multiple risks, including climatic, disease, and market risks, that make crop insurance especially valuable to them. However, risk interactions raise specific issues: The value of prevention efforts in a multiple risk context, risk correlation, and compounded effects (whereby the realization of a risk makes it difficult to prevent another one) all affect the design and effectiveness of insurance. In contrast to the US, the EU-subsidized crop insurance creates different financial conditions for climate and pest risks and increases expertise costs. We discuss how this affects input use and disproportionately disadvantages organic producers because of compounded effects. We report on an experiment bundling a real pest insurance contract with an agronomic protocol aiming at reducing treatments, for vine-growing in the South-West of France. The experiment highlighted the costs to separating risks in insurance contracts, as well as the need for insurance to help transition to greener practices.
Constraining the Possible Mechanisms Underlying Performance Improvements Following Peripheral Vision Training
Authors: Biles Mandy K. , Maniglia Marcello , Yadav Ishant S. , Stewart Paul D. , DeSilva Brody C. , Visscher Kristina M.
Published: October 2024

Some training paradigms can improve performance specific to the trained portion of the visual field. Similarly, experience with both pathological and simulated central vision loss can result in compensatory improvement in performance specific to a spared retinal location. The mechanisms underlying these improvements are still debated. Modifications in the capacity to allocate attention to trained locations might explain some of the changes in performance after learning, especially given similarities between behavioral improvements due to training and improvements due to changes in attention. Using a gaze-contingent simulated scotoma paradigm which simulates central vision loss, we tested whether training to use peripheral vision influenced three aspects of visual attention: habitual attention, dynamic exogenous attention, and dynamic endogenous attention. After training, performance improvements were consistent with increased habitual attention to the trained location. Conversely, measures of dynamic shifts of attention (exogenous and endogenous attention) improved similarly in both trained and untrained locations. The lack of retinotopic specificity in dynamic attention improvements suggests that retinotopically specific perceptual improvements following simulated central vision loss are not mediated by dynamic attention changes. On the other hand, habitual attention did change retinotopically, leaving the possibility open that this aspect of attention may drive some retinotopically specific training effects. This work constrains the range of mechanisms that could underlie performance improvements after peripheral vision training, suggesting that habitual attention and dynamic attention are affected independently.
Survey on the occurrence of Aspergillus section Nigri species in grapes cultivated in Umbria (central Italy) and influence of several factors on their distribution
Authors: Covarelli Lorenzo , Tini Francesco , Perrone Giancarlo , Magistà Donato , Onofri Andrea , Beccari Giovanni
Published: October 2024

Secondary bunch rots caused by Aspergillus species belonging to the section Nigri, commonly called black aspergilli, pose a serious threat to grapes yield and quality. Due to their ability to produce ochratoxin A (OTA), they are considered the primary source of contamination of this mycotoxin in grapes. In this study, a three-year survey was realized to assess the occurrence of black aspergilli in grapes harvested in the Umbria region, a very important grapevine cultivation area in central Italy, by fungal isolation and phylogenetic analysis. In addition, the influence of growing season, vineyard location, farming system and grapes growth stages on black aspergilli distribution was examined. Phylogenetic analysis of the 208 obtained isolates showed the presence of three black aspergilli species: Aspergillus tubingensis, Aspergillus welwitschiae and Aspergillus uvarum. Interestingly, A. carbonarius, one of the most important OTA producers, was not detected in the surveyed years. A. tubingensis, whose ability to produce OTA is controversial, was always the most isolated species followed by A. welwistichiae (OTA producer). The species A. uvarum (unable to produce OTA) was detected only in one surveyed year with a low incidence. A. tubingensis was always the species with the highest incidence, regardless of location, and farming system. Growth stage appeared to influence the incidence of the three species, that, in the case of A tubingensis, was lower during setting in comparison to berries pea-size and berries harvest-ripe. Finally, in the setting and berries pea-size stages, a stereomicroscope analysis, showed that flower debris was the substrate from which black aspergilli mainly developed prior to colonizing berries and bunches.
Governance, institutional quality and economic complexity in selected African countries
Authors: Mini Litha , Moyo Clement , Phiri Andrew
Published: October 2024

New economic thinking speculates that the diversification and sophistication of economic capabilities/structures is key in explaining why African countries lag in development behind the rest of the world. We question the extent to which non-traditional growth factors such as governance and institutional quality are related to economic complexity for 35 African countries. We estimate panel GMM regressions using 8 different measures of governance/institutional quality for both linear and kinked regressions using annual data collected between 1996 and 2021. The baseline estimates reveal a positive linear relationship between most measures of governance and institutional quality and economic complexity. Our sensitivity analysis further show that institutions/governance have stronger relationship with economic complexity in the post-global financial crisis era. Moreover, nonlinear or kinked relationships emerge once the data is segregated into different income and resource abundant groups. Altogether, our findings of a nonlinear relationship between institutions/governance and economic complexity are novel to the literature and offer unique insights on how African policymakers can use governance/institutions for improving the complexity of production processes.
Tracked evolution of single biochar particle’s morphology during pyrolysis in operando x-ray micro-computed tomography
Authors: Salinas-Farran Luis , Mosonik Maryanne Chelang’At , Jervis Rhodri , Marathe Shashidhara , Rau Christoph , Volpe Roberto
Published: October 2024

The engineering of biochars with desired morphologies and pore structures is a far-reaching objective towards sustainable pore-dependent environmental technologies, such as water and soil remediation or catalysis. We hereby report a series of experiments that allow the direct following of the shape and porosity of single biochar particles during pyrolysis. Particles ~ 1–2 mm in diameter of unwashed and water-washed raw walnut shells were continuously 3D imaged during pyrolysis to 575 ℃ at a 10 K min−1 in Ar to obtain time- and temperature-resolved x-ray micro computed tomographies to a 0.82 μm resolution. Results showed visual evidence of a 30% and 70% v/v particle shrinkage for unwashed and washed samples, respectively. Particle swelling between 200 and 300 ℃ in the unwashed sample provided evidence of the softening of native biopolymers associated with lignin in untreated biomass. A purpose-defined parameter Λ shows the temperature-dependence of pore re-distribution towards the center of the particle to be linear for both samples. Λ was found to be $$3.2\times {10}^{-4}{K}^{-1}$$

3.2
×

10

-
4

K

-
1

in the washed sample, approximately 3.5 times faster than in the unwashed one. Such linear dependence is significantly slower than an exponential Arrhenius-like trend thereby providing a qualitative measure of the heat and mass transport phenomena limiting the chemical reactions in the porous medium. This evidence is key to resolving the pathways to the thermochemical decomposition of biomass leading to preparation of precision-engineered biochars.

Graphical Abstract
Addressing ethical challenges in automated vehicles: bridging the gap with hybrid AI and augmented utilitarianism
Authors: Gros Chloe , Kester Leon , Martens Marieke , Werkhoven Peter
Published: October 2024

In the realm of automated vehicles (AVs), the focus is predominantly on the potential of sub-symbolic deep-learning-based artificial intelligence (AI) systems. Our study questions the suitability of this data-driven approach for AVs, particularly in embodying societal values in their behaviour. Through a systematic examination of sub-symbolic and symbolic AI, we identify key issues for AVs, including adaptability, safety, reliability, trust, fairness, transparency, and control. Deep learning systems’ lack of adaptability and inherent complexities pose significant safety concerns and hinder meaningful human control. This limitation prevents humans from effectively updating AI decision-making processes to better reflect ethical values. Furthermore, deep learning systems are prone to biases and unfairness, leading to incidents that are difficult to explain and rectify. In contrast, symbolic, model-based approaches offer a structured framework for encoding ethical goals and principles within AV systems, thus enabling meaningful human control. However, they also face challenges, such as inefficiencies in handling large amounts of unstructured data for low-level tasks and maintaining explicit knowledge bases. Therefore, we advocate for hybrid AI, combining symbolic and sub-symbolic models with symbolic goal functions. We propose Augmented Utilitarianism (AU) as an ethical framework for developing these goal functions, aiming to minimise harm by integrating principles from consequentialism, deontology, and virtue ethics, while incorporating the perspective of the experiencer. Our methodology for eliciting moral attributes to construct an explicit ethical goal function engages collective societal values through iterative refinement, contributing to the development of safer, more reliable, and ethically aligned automated driving systems.
Tail risk driven by investment losses and exogenous shocks
Authors: Man Xinyue , Tang Qihe
Published: October 2024

Consider a company whose business carries the potential for investment losses and is additionally vulnerable to exogenous shocks. The unpredictability of the shocks makes it challenging for both the company and the regulator to accurately assess their impact, potentially leading to an underestimation of solvency capital when employing traditional approaches. In this paper, we utilize a stylized model to conduct an extreme value analysis of the tail risk of the company under a Fréchet-type and a Gumbel-type shock. Our main results explicitly demonstrate the different roles of investment risk and shock risk in driving large losses. Furthermore, we derive asymptotic estimates for the value at risk and expected shortfall of the total loss. Numerical studies are conducted to examine the accuracy of the obtained estimates.
Central Banks as Regulators and (also) Operators of Instant Payments Schemes: Confronting the Criticisms of “Needless Intervention” and “Unfair Competition”
Authors: Ragazzo Carlos , Caminha Lucas
Published: October 2024

We argue it is efficient/desirable for central banks to operate retail Instant Payments (IP) schemes and infrastructure, considering that (i) payment service providers (PSPs) face a problem of collective action, which limits their capacity to deliver a cheap, fast, open-architecture and interoperable IP scheme; and (ii) this problem may be overcome by a central bank (economically neutral actor) with a dual role of regulator and operator of IP schemes, especially by mandating participation of large PSPs and ensuring that the low cost of infrastructure is passed on to consumers. We corroborate with data from Brazil’s Pix and India’s UPI, where the efficiencies of central bank-led IP schemes also led to social gains through financial inclusion.
Geometric properties of disintegration of measures
Authors: POSSOBON RENATA , RODRIGUES CHRISTIAN S.
Published: October 2024

In this paper, we study a connection between disintegration of measures and geometric properties of probability spaces. We prove a disintegration theorem, addressing disintegration from the perspective of an optimal transport problem. We look at the disintegration of transport plans, which are used to define and study disintegration maps. Using these objects, we study the regularity and absolute continuity of disintegration of measures. In particular, we exhibit conditions for which the disintegration map is weakly continuous and one can obtain a path of measures given by this map. We show a rigidity condition for the disintegration of measures to be given into absolutely continuous measures.
Perceptions of healthcare workers on linkage between depression and hypertension in northern Ghana: a qualitative study
Authors: Adu-Amankwah Dorothy , Babagoli Masih A. , Aborigo Raymond A. , Squires Allison P. , Nonterah Engelbert , Jones Khadija R. , Alvarez Evan , Anyorikeya Maria , Horowitz Carol R , Weobong Benedict , Heller David J.
Published: October 2024

Hypertension and depression are increasingly common noncommunicable diseases in Ghana and worldwide, yet both are poorly controlled. We sought to understand how healthcare workers in rural Ghana conceptualize the interaction between hypertension and depression, and how care for these two conditions might best be integrated. We conducted a qualitative descriptive study involving in-depth interviews with 34 healthcare workers in the Kassena-Nankana districts of the Upper East Region of Ghana. We used conventional content analysis to systematically review interview transcripts, code the data content and analyze codes for salient themes. Respondents detailed three discrete conceptual models. Most emphasized depression as causing hypertension: through both emotional distress and unhealthy behavior. Others posited a bidirectional relationship, where cardiovascular morbidity worsened mood, or described a single set of underlying causes for both conditions. Nearly all proposed health interventions targeted their favored root cause of these disorders. In this representative rural Ghanaian community, healthcare workers widely agreed that cardiovascular disease and mental illness are physiologically linked and warrant an integrated care response, but held diverse views regarding precisely how and why. There was widespread support for a single primary care intervention to treat both conditions through counseling and medication.
Global stability analysis of hydrodynamic focusing in the presence of a soluble surfactant
Authors: Rubio M. , Cabezas M.G. , Montanero J.M. , Herrada M.A.
Published: October 2024

We numerically study the influence of a soluble surfactant on the microjetting mode of the liquid–liquid flow focusing configuration. The surfactant adsorbs on the interface next to the feeding capillary and accumulates in front of the emitted jet, significantly lowering the surface tension there. The resulting Marangoni stress substantially alters the balance of the tangential stresses at the interface but does not modify the interface velocity. The global stability analysis at the minimum flow rate stability limit shows that the Marangoni stress collaborates with soluto-capillarity to stabilize the microjetting mode. Our analysis unveils the noticeable effect of the Marangoni stress associated with the surface tension perturbation. Surfactant diffusion and desorption hardly affect the stability limit. Transient numerical simulations show how subcritical and supercritical base flows respond to a spatially localized initial perturbation. Our parametric study indicates that the minimum flow rate ratio depends on the adsorption constant and the surfactant concentration through the product of these two variables. The surfactant stabilizing effect increases with the outer stream flow rate. We show that surfactants not only stabilize the microemulsion resulting from the jet breakup in hydrodynamic focusing, but also allow for the reduction of droplet size. Our findings advance the fundamental understanding of the complex role of surfactants in tip streaming via hydrodynamic focusing. In particular, our results contradict the common assumption that adding surfactant favours tip streaming simply because it reduces the meniscus tip surface tension.
The Massacre of Corpus Thursday: A Historical Approach Through Images
Authors: del Castillo Troncoso Alberto
Published: October 2024

This article examines one of the most violent episodes in Mexico’s recent history—the Corpus Thursday massacre orchestrated by the Mexican government against young students on June 10, 1971. The event marked the beginning of a period known as the guerra sucia (dirty war), marked by the systematic repression of students and dissenting political groups by government forces. The present work advocates for “making history with photographs,” urging readers to explore the historical moment through the narratives presented by three distinct historical actors: the press, independent photographers, and the perspective of power from governmental organizations.
Erythrocyte membrane and breast milk fatty acid profile in lactating mothers: relationship with infant erythrocyte membrane fatty acid profile
Authors: Visentin Silvana , Malpeli Agustina , Fasano Victoria , Sala Marisa , Gonzalez Horacio Federico
Published: October 2024

During the first thousand days of life, fetus and infant’s nutrition depends on mother’s diet. Polyunsaturated fatty acids (PUFA) are important substrates in infant neurogenesis. We related erythrocyte membrane (EM) and breast milk fatty acids (FA) profile in lactating mothers with the EM FA profile in exclusively breastfed infants and evaluated maternal fat consumption. We conducted an observational, cross-sectional analytical study. During the 2016–2019 period, milk and blood samples from adult mothers 90 days post-partum and infant’s blood were analysed, and FA were determined by GC. A frequency of consumption survey of fatty acids precursor foods and sources was conducted. The sample included forty-five mother–infant EM and forty-five milk samples donated by the same mothers. A low percentage of DHA (0·14 (0·12–0·2)) was found in milk, consistent with mother’s low consumption of DHA-rich foods. A significant positive correlation between infant’s EM DHA percentage and milk DHA percentage (r = 0·39; P value 0·008), as well as between infant’s EM ω-3 fatty acids sum and milk DHA percentage (r = 0·39; P value 0·008), was found. When milk had a DHA percentage greater than or equal to 0·20 %, infants had a significant increase in DHA in their EM. Mother’s consumption of DHA precursors and sources was NS. The relation between the DHA percentage distribution found in maternal milk, and the DHA percentage distribution found in infant’s and mother’s EM was proven in this population. Dietary fatty acid intake is associated with the maternal milk lipid distribution and with mothers’ and infant’s EM fatty acids percentage.
Gilles Deleuze au Québec
Authors: Beaulieu Alain
Published: October 2024

Gilles Deleuze est, parmi les penseurs français contemporains, celui ayant démontré la plus grande sensibilité à l’égard de la culture québécoise en intégrant quelques-unes de ses forces révolutionnaires dans son œuvre. C'est ce qu'illustre la première partie de l'article en faisant référence à des figures culturelles marquantes discutées par Deleuze : Jack Kérouac, Pierre Perrault, Michèle Lalonde, Norman McLaren et Alexis le Trotteur. L'article explore ensuite la réception de Deleuze au Québec dans et à l'extérieur des milieux universitaires en montrant que la pensée deleuzienne a pris part à la contre-culture avant d'acquérir une visibilité au sein des départements de philosophie.
“A Not Unworthy Record”?: Sir Ponnambalam Arunachalam's 1901 Census of Ceylon and the Transforming of Dynamic Nominalism
Authors: Schubert Andi
Published: October 2024

Drawing inspiration from Ian Hacking's claim that new modes of description generate new possibilities for action, this essay explores the impact of changes to the mode of description through the 1901 Census in Ceylon. It begins by exploring the modes of description used in the censuses prior to 1901 to demonstrate that in Ceylon, the census was yet to emerge as the critical tool of colonial governance claimed by dominant scholarship around colonial census taking. This leads to an exploration of how the changes that Sir Ponnambalam Arunachalam, the first Ceylonese Census superintendent, made to the Census Ordinance, Census Manual, and Census Report impacted the function of the census as a mode of description. It then explores the possibilities for action generated by these changes in the mode of description, paying particular attention to the ways in which the census shaped elite, indigenous activism leading to the first major reforms of the colonial governance structure in Ceylon, including the introduction of limited franchise. Thus, Ceylon's 1901 Census affords a unique opportunity to examine the impact that shifts in modes of description have on possibilities for action.
Role of BT shunt in tetralogy of Fallot
Authors: Rasool Faiz , Qureshi Amna Zafer , Khan Asim , Kazmi Tehmina , Shah Salman Ahmad
Published: October 2024

Introduction:

Modified Blalock-Taussig shunt (BT shunt) is a palliative operation used for cyanotic heart diseases with decreased pulmonary blood supply. The definitive management of tetralogy of Fallot (TOF) is total corrective surgery, but these patients can be palliated with BT shunt. In the modern world, the BT shunt is getting out of favour in patients with TOF. In this article, we will share our 5-year experience at our institute, which also shows a decreasing trend.

Patients and methods:

It is a retrospective study. Files of all the patients admitted in our department from January 2019 to December 2023 were reviewed. Age, weight, hospital stay, inotropic support duration, mechanical ventilation duration, and outcomes were studied.

Results:

From January 2019 to December 2023, 173 patients underwent BT shunt for TOF. The mean age was 31 months, and the mean weight was 9.3 kg. The overall mortality for BT shunt was 15% after BT shunt. Hypercyanotic spell not controlled by medical management was the most common indication for BT shunt in our setup. Most of the patients with hypercyanotic spells were also candidates for total correction but due to the emergency, BT shunt was performed.

Conclusion:

The role of BT shunt in patients with TOF is decreasing due to PDA/RVOT stenting, it is likely that the BT shunt in TOF will become a thing of the past in the future even in developing countries like ours.
Bias‐Eliminating Techniques in the Computation of Power Spectra for Characterizing Gravity Waves: Interleaved Methods and Error Analyses
Authors: Jandreau Jackson , Chu Xinzhao
Published: October 2024

Observational data inherently contain noise which manifests as uncertainties in the measured parameters and creates positive biases or noise floors in second‐order products like variances, fluxes, and spectra. Historical methods estimate and subsequently subtract noise floors, but struggle with accuracy. Gardner and Chu (2020, doi.org/10.1364/AO.400375) proposed an interleaved data processing method, which inherently eliminates biases from variances and fluxes, and suggested that the method could also eliminate noise floors of power spectra. We investigate the interleaved method for spectral analysis of atmospheric waves through theoretical studies, forward modeling, and demonstration with lidar data. Our work shows that calculating the cross‐power spectral density (CPSD) from two interleaved subsamples does reduce the spectral noise floor significantly. However, only the Co‐PSD (the real part of CPSD) eliminates the noise floor completely, while taking the absolute magnitude of CPSD adds a reduced noise floor back to the spectrum when the sample number is finite. This reduced noise floor can be further minimized through averaging over more observations, completely different from traditional spectrum calculations whose noise floor cannot be reduced by incorporating more samples. We demonstrate the first application of the interleaved method to spectral data, successfully eliminating the noise floor using the Co‐PSD in a forward model and in lidar observations of the vertical wavenumber of gravity waves at McMurdo, Antarctica. This high accuracy is gained by sacrificing precision due to photon‐count splitting, requiring additional observations to counter this effect. We provide quantitative assessment of accuracy and precision as well as application recommendations.
Predicting the Probability of Abrupt Changes to Wave‐Generated Seafloor Sand Ripples
Authors: Penko A. M. , Kearney W. S.
Published: October 2024

A new, non‐dimensional ripple reset parameter and a stochastic point process model is used to estimate the likelihood of propagating ocean waves to form ripples on sandy seabeds. The ripple reset parameter is a function only of water depth, significant wave height, and mean grain size. Ripple formation is estimated by the magnitude of an intensity function based on a time series of the ripple reset parameter. The point process model is trained with a time series of observed waves and ripple change, and is then applied to predict the probability that a ripple field with a different geometry will form within a given time interval from another time series of wave data. The model is trained and tested with four field deployments at three field sites to determine its skill in predicting the ripple formation (a) at one field site over one time period after being trained with observations from the same site over a different time period, and (b) at one field site after being trained with observations from another field site. Results show that while the model is sufficient at predicting ripple formation in both scenarios, it is sensitive to the quality and quantity of the training data. Increasing the amount of training data greatly improves model performance. Employing a stochastic model based on a simple ripple reset parameter reduces tunable model parameters and provides a prediction of the probability for ripple formation given only a water depth, grain size, and time series of wave heights.
The Significance of the Long‐Wavelength Correction for Studies of Baroclinic Tides With SWOT
Authors: Zaron Edward D.
Published: October 2024

The long‐wavelength correction (LWC) of SWOT data is intended to reduce errors related to the stability of the SWOT antenna and its attitude in orbit. The algorithms used to compute the LWC utilize SWOT KaRIn sea surface‐height (SSH) measurements and additional data, and the LWC may absorb geophysical SSH into the correction. Different LWC algorithms are used on the L2 and L3 SWOT products, which are analyzed here during the 1 day repeat (Cal/Val) mission phase lasting approximately 100 days. During this mission phase the SSH anomaly (SSHA) computed using the L3 LWC is much more realistic than the L2 LWC, as shown here by comparing spatial statistics of the L2 and L3 products. The L3 LWC algorithm is nonlinear insofar as it depends on second‐order statistics of the SSHA and multi‐satellite SSHA differences, making it difficult to quantify the extent to which it could absorb baroclinic tidal signals. To overcome this difficulty, a proxy L3 LWC algorithm is developed which mimics the L3 LWC but is strictly linear in the SSHA. The proxy LWC is applied to both idealized waveforms and to the predicted internal tide available on the products, and it is found to absorb 1% or less of the signal variance, leading to corresponding pointwise errors of 10% or less. Because the errors are at longer wavelengths and are significantly smaller amplitude than internal tide signals, the LWC impact on the measurement and interpretation of internal tides with SWOT is expected to be negligible in most applications.
How Did Magma Oceans Evolve on Early Earth and Mars?
Authors: Stanley Sarah
Published: October 2024

New insights into the early timelines of rocky planets are emerging, thanks to clues from iron chemistry and primordial atmospheres.
A Global Meta‐Analysis of the Effects of Greenspaces on COVID‐19 Infection and Mortality Rates
Authors: Phogole Bopaki , Yessoufou Kowiyou
Published: October 2024

The COVID‐19 outbreak in 2020 resulted in rapidly rising infection rates with high associated mortality rates. In response, several epidemiological studies aimed to define ways in which the spread and severity of COVID‐19 can be curbed. As a result, there is a steady increase in the evidence linking greenspaces and COVID‐19 impact. However, the evidence of the benefits of greenspaces or greenness to human wellbeing in the context of COVID‐19 is fragmented and sometimes contradictory. This calls for a meta‐analysis of existing studies to clarify the matter. Here, we identified 621 studies across the world on the matter, which were then filtered down to 13 relevant studies for meta‐analysis, covering Africa, Asia, Europe, and the USA. These studies were meta‐analyzed, with the impacts of greenness on COVID‐19 infection rate quantified using regression estimates whereas impacts on mortality rates were measured using mortality rate ratios. We found evidence of significant negative correlations between greenness and both COVID‐19 infection and mortality rates. We further found that the impacts on COVID‐19 infection and related mortality are moderated by year of publication, greenness metrics, sample size, health and political covariates. This clarification has far‐reaching implications for policy development toward the establishment and management of green infrastructure for the benefit of human wellbeing.
Controls on the Stratigraphic Architecture of the US Atlantic Margin: Processes Forming the Accommodation Space
Authors: Lang G. , ten Brink U. S. , Hutchinson D. R. , Mountain G. S. , Schattner U.
Published: October 2024

Accommodation space governs the spatial and temporal distributions of sediments in continental margins. Mapping the sedimentation patterns, therefore, offers insights into the solid‐Earth processes that shape accommodation space. We assembled an unprecedented amount of seismic and borehole data along the Eastern North American Margin and used it to divide the margin's sedimentary package into eight chronostratigraphic intervals, identifying temporal shifts in depocenters under the continental shelf, slope, and rise. The Jurassic depocenters follow the syn‐rift structure and its thermal subsidence loci. The Long Island Platform is the only margin segment where the early post‐rift sediment thickness matches subsidence predictions from uniform‐stretching models, whereas in Georges Bank Basin (GBB) and Baltimore Canyon Trough (BCT), sediment thickness is 1.5–3 times higher than predicted, pointing to other factors at play. A margin‐wide Jurassic transient shoulder uplift is inferred from the occurrence of stratigraphic onlaps above thinned crust. Unlike the Jurassic, the Cretaceous and Cenozoic depocenters disregard the inherited subsidence pattern. The accommodation space over the shelf and coastal plain during the Cretaceous was affected by regional isostatic compensation of the sedimentary loads accumulated on the shelf and rise. Accommodation space development in the GBB was interrupted during the Cretaceous after the margin crossed the Great Meteor Hotspot track, resulting in a widespread permanent uplift, erosion, and sediment redistribution. The distribution of anomalous Neogene subsidence in the BCT challenges previous suggestions of mantle dynamic control on the accommodation space and favors flexural downwarping of the shelf by sediment accumulation on the rise.
Modeling of Melting Layer in Cross‐Platforms Radar Observation Operator ZJU‐AERO: Multi‐Stage Melting Particle Model, Scattering Computation, and Bulk Parameterization
Authors: Xie Hejun , Bi Lei , Wang Zheng , Han Wei
Published: October 2024

This study presents an implementation of a new melting layer model in the ZJU‐AERO radar observation operator (Accurate and Efficient Radar Operator designed by ZheJiang University). The proposed model utilizes a coated spheroid to represent melting snow and graupel. It consists of three stages–coating, soaking, and melting–to account for the dielectric and density effects of melting particles. The scattering properties of the melting particles are computed with the Invariant‐Imbedding T‐Matrix (IITM) method, and the results are tabulated as look‐up tables for the radar operator. Regarding the parameterization of bulk optical properties, a flux‐conservation scheme is employed to estimate the size distribution of melting particles. To demonstrate its flexibility and superiority, the single and bulk scattering properties of our multi‐stage melting model are compared against the traditional homogeneous model, which uses the effective medium approximation (EMA). The effectiveness of the multi‐stage melting model has also been assessed by mapping model states in the regional mesoscale model of the China Meteorology Administration (CMA‐MESO) to radar observations. In the microphysics package of CMA‐MESO, the melting process is not explicitly represented, and we assume that melting hydrometeors occur where solid and liquid phases overlap. When compared with observations, the present multi‐stage melting model successfully reproduces melting layer signatures, highlighting its potential for microphysic validation, quantitative precipitation estimations, and data assimilation studies.
An Empirical Parameterization of the Subgrid‐Scale Distribution of Water Vapor in the UTLS for Atmospheric General Circulation Models
Authors: Borella Audran , Vignon Étienne , Boucher Olivier , Rohs Susanne
Published: October 2024

Temperature and water vapor are known to fluctuate on multiple scales. In this study 27 years of airborne measurements of temperature and relative humidity from In‐service Aircraft for a Global Observing System (IAGOS) are used to parameterize the distribution of water vapor in the upper troposphere and lower stratosphere. The parameterization is designed to simulate water vapor fluctuations within gridboxes of atmospheric general circulation models (AGCMs) with typical size of a few tens to a few hundred kilometers. The distributions currently used in such models are often not supported by observations at high altitude. More sophisticated distributions are key to represent ice supersaturation, a physical phenomenon that plays a major role in the formation of natural cirrus and contrail cirrus. Here the observed distributions are fitted with a beta law whose parameters are adjusted from the gridbox mean variables. More specifically the standard deviation and skewness of the distributions are expressed as empirical functions of the average temperature and specific humidity, two typical prognostic variables of AGCMs. Thus, the distribution of water vapor is fully parameterized for a use in these models. The new parameterization reproduces the observed distributions with a determination coefficient always greater than 0.917 and with a mean value of 0.997. The parameterization is robust to a selection of various geographical subsets of data and to gridbox sizes varying between 25 and 300 km.
Deep Learning‐Based Precipitation Simulation for Tropical Cyclones, Mesoscale Convective Systems, and Atmospheric Rivers in East Asia
Authors: Zhang Lujia , Zhao Yang , Cen Yiting , Lu Mengqian
Published: October 2024

Different types of weather events, including tropical cyclones (TCs), mesoscale convective systems (MCSs), and atmospheric rivers (ARs), significantly impact precipitation patterns in East Asia. This study pioneers the application of deep learning (DL) methods, including convolutional neural network, U‐Net, and Attention U‐Net models, to simulate precipitation associated with these weather events. The spatial permutation method is also used to identify key meteorological variables for accurately generating precipitation in DL models. The DL models trained on all timeslots consistently surpass the performance of state‐of‐the‐art numerical simulations, although their efficacy slightly diminishes during extreme weather events. This outperformance is attributed to the appropriate emphasis on key variables that capture precipitation processes, such as low‐level moisture and mid‐level pressure fields. However, new DL models trained separately for TCs, MCSs, and ARs using clipped precipitation as the output does not exceed the performance of the previous DL models. Among all input features, moisture variables contribute the most to precipitation at low intensity, while the importance of other variables increases for more intense precipitation, although some discrepancies vary across models and event types. The spatial results further reveal the detailed locations of variables that are essential for accurately simulating precipitation related to weather events, such as areas of high specific humidity and strong winds. DL models could also acquire useful information from region remote to the events to improve the simulation. Overall, DL models serve as promising tools for simulating and enhancing our understanding of precipitation patterns associated with various weather events in East Asia.
Climate‐Induced Uncertainty in Modeling Gross Primary Productivity From the Light Use Efficiency Approach
Authors: Wang Jiyan , Wang Yong , Xie Xinyao , Zhao Wei , Wu Changlin , Guan Xiaobin , Yang Tao
Published: October 2024

Light use efficiency (LUE) models, along with satellite‐based vegetation maps and climatic reanalysis products as drivers, are effective tools for estimating large‐scale gross primary productivity (GPP). However, the climate‐induced uncertainty in LUE‐based GPP remains poorly understood, particularly the temporal scaling uncertainty from ignored climatic fluctuations. Here, two 1‐hourly reanalysis products, along with site‐based observations, were employed to drive a two‐leaf LUE model at 194 eddy‐covariance (EC) sites. The observation‐driven and reanalysis‐driven GPP at the 1‐hourly resolution were evaluated against EC GPP to illustrate the uncertainty from reanalysis products, with mean absolute deviation (MAD) and Nash‐Sutcliffe efficiency (NSE) as criterion. Moreover, the climate‐induced temporal scaling uncertainty was characterized by comparing distributed GPP (modeled with 1‐hourly resolution climatic drivers) and lumped GPP (modeled with 6‐hourly resolution climatic drivers). At the 1‐hourly resolution, results demonstrated that the reanalysis‐driven GPP showed a weaker relationship with EC GPP (MAD = 0.14 gC m−2h−1, NSE = 0.48) than the observation‐driven GPP (MAD = 0.12 gC m−2h−1, NSE = 0.60), confirming the nonnegligible climate‐induced uncertainty from reanalysis products. Additionally, the climate‐induced uncertainty arising from gridded radiation was found to be significantly larger than that associated with temperature and vapor pressure deficit (VPD). At the 6‐hourly resolution, both the observation‐driven and reanalysis‐driven lumped GPP exhibited a lower relationship with EC GPP (MAD = 0.63 gC m−26h−1, NSE = 0.54) than the corresponding distributed GPP (MAD = 0.57 gC m−26h−1, NSE = 0.59), demonstrating that the climate‐induced temporal scaling uncertainty in 6‐hourly GPP estimates was significantly apparent. This study emphasizes the imperative to refine reanalysis products for more precise capture of short‐term fluctuations and to reduce scaling uncertainties in coarse temporal resolution GPP estimates.
Histone lysine methylation modifiers controlled by protein stability
Authors: Park Sungryul , Cho Jin Hwa , Kim Jeong-Hoon , Kim Jung-Ae
Published: October 2024

Histone lysine methylation is pivotal in shaping the epigenetic landscape and is linked to cell physiology. Coordination of the activities of multiple histone lysine methylation modifiers, namely, methyltransferases and demethylases, modulates chromatin structure and dynamically alters the epigenetic landscape, orchestrating almost all DNA-templated processes, such as transcription, DNA replication, and DNA repair. The stability of modifier proteins, which is regulated by protein degradation, is crucial for their activity. Here, we review the current knowledge of modifier-protein degradation via specific pathways and its subsequent impact on cell physiology through epigenetic changes. By summarizing the functional links between the aberrant stability of modifier proteins and human diseases and highlighting efforts to target protein stability for therapeutic purposes, we aim to promote interest in defining novel pathways that regulate the degradation of modifiers and ultimately increase the potential for the development of novel therapeutic strategies.
Extended-depth of field random illumination microscopy, EDF-RIM, provides super-resolved projective imaging
Authors: Mazzella Lorry , Mangeat Thomas , Giroussens Guillaume , Rogez Benoit , Li Hao , Creff Justine , Saadaoui Mehdi , Martins Carla , Bouzignac Ronan , Labouesse Simon , Idier Jérome , Galland Frédéric , Allain Marc , Sentenac Anne , LeGoff Loïc
Published: October 2024

The ultimate aim of fluorescence microscopy is to achieve high-resolution imaging of increasingly larger biological samples. Extended depth of field presents a potential solution to accelerate imaging of large samples when compression of information along the optical axis is not detrimental to the interpretation of images. We have implemented an extended depth of field (EDF) approach in a random illumination microscope (RIM). RIM uses multiple speckled illuminations and variance data processing to double the resolution. It is particularly adapted to the imaging of thick samples as it does not require the knowledge of illumination patterns. We demonstrate highly-resolved projective images of biological tissues and cells. Compared to a sequential scan of the imaged volume with conventional 2D-RIM, EDF-RIM allows an order of magnitude improvement in speed and light dose reduction, with comparable resolution. As the axial information is lost in an EDF modality, we propose a method to retrieve the sample topography for samples that are organized in cell sheets.