bluuebunny/crossref_metadata_2025 huggingface dataset:
Transformation of CO2 into value-added green hydrocarbon components through a modified catalytic route using biomass-generated graphene-based structures
Authors: Moniem Mohamed A. , Shalaby Nasser H. , Amdeha Enas , El Naggar Ahmed M. A. , El Sayed Hussien A. , Abd El-sattar Nour E. A. , Hashem Ahmed I.
Published: October 2024

Carbon dioxide gas is considered one of the major contributors to the global warming phenomena and acid rains which have serious impacts on both the environment and living creatures. However, carbon dioxide can be of high benefit if introduced in some chemical processes to produce valuable products. In agreement with this goal, this research study presents the catalytic conversion of CO2 gas to hydrocarbon structures that can be highly advantageous in the energy sector. Three novel catalysts made of graphene as a support layer and active sites of transition metals (Ni, Cu, and Zn) nanoparticles were utilized during the conversion process. The preparation of these catalysts launched by producing graphene from rice straw through thermochemical treatment followed by the direct loading of metals nanoparticles on an individual basis. The structural and surface characteristics of the prepared catalytic structures were determined via Fourier Transform Infrared (FTIR), Raman Spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N2 adsorption–desorption surface area analysis. The catalytic performances of these three structures toward the conversion of carbon dioxide into valuable hydrocarbons were then investigated at different operating temperatures and reaction residence time (as a modified pathway imitating the Fischer–Tropsch reaction). The three structures could show significant activity in terms of attaining high levels of CO2 conversions which were detected as approximately 99, 95, and 82% for Ni, Zn, and Cu-containing catalysts respectively. Nevertheless, the catalysts which were made of Ni and Cu nanoparticles revealed high selectivity (nearly 55%) toward the production of liquefied petroleum gas (LPG) fractions while Zn-based catalysts could display a complete tendency to reduce carbon dioxide into CO. On the other hand, Ni-catalysts could also exhibit increased selectivity to produce the components of natural gas (NG) fraction.
Sleep Characteristics Among Children with a Parental History of Alcohol Use Disorder
Authors: Wong Maria M. , Hillebrant-Openshaw Madisen
Published: October 2024

Purpose of Review

The purpose of the review was to examine findings on sleep characteristics among children with a parental history of alcohol use disorder (CPHAUDs) in different age groups. We identified unanswered questions and discussed directions for future research. We also discussed the implications of these current findings on alcohol prevention and intervention programs.

Recent Findings

Parental ratings and youth report of sleep difficulties have been longitudinally associated with the emergence of alcohol use and alcohol-related problems among both CPHAUDsand non-CPHAUDs. There were inconsistent findings comparing sleep characteristics in these two groups. Studies that used self-report and parental ratings reported no or minimal differences while studies that used actigraphy and polysomnography found significant, albeit moderate but meaningful differences.

Current research shows that CPHAUDs and non-CPHAUDs are similar on most objective and subjective sleep measures. There are a few significant differences between the two groups that may have implications for the development of behavioral problems, substance use and other risk behaviors.
High-speed grinding: from mechanism to machine tool
Authors: Wang Yu-Long , Zhang Yan-Bin , Cui Xin , Liang Xiao-Liang , Li Run-Ze , Wang Ruo-Xin , Sharma Shubham , Liu Ming-Zheng , Gao Teng , Zhou Zong-Ming , Wang Xiao-Ming , Dambatta Yusuf Suleiman , Li Chang-He
Published: October 2024

High-speed grinding (HSG) is an advanced technology for precision machining of difficult-to-cut materials in aerospace and other fields, which could solve surface burns, defects and improve surface integrity by increasing the linear speed of the grinding wheel. The advantages of HSG have been preliminarily confirmed and the equipment has been built for experimental research, which can achieve a high grinding speed of more than 300 m/s. However, it is not yet widely used in manufacturing due to the insufficient understanding on material removal mechanism and characteristics of HSG machine tool. To fill this gap, this paper provides a comprehensive overview of HSG technologies. A new direction for adding auxiliary process in HSG is proposed. Firstly, the combined influence law of strain hardening, strain rate intensification, and thermal softening effects on material removal mechanism was revealed, and models of material removal strain rate, grinding force and grinding temperature were summarized. Secondly, the constitutive models under high strain rate boundaries were summarized by considering various properties of material and grinding parameters. Thirdly, the change law of material removal mechanism of HSG was revealed when the thermodynamic boundary conditions changed, by introducing lubrication conditions such as minimum quantity lubrication (MQL), nano-lubricant minimum quantity lubrication (NMQL) and cryogenic air (CA). Finally, the mechanical and dynamic characteristics of the key components of HSG machine tool were summarized, including main body, grinding wheel, spindle and dynamic balance system. Based on the content summarized in this paper, the prospect of HSG is put forward. This study establishes a solid foundation for future developments in the field and points to promising directions for further exploration.
The negative association between sodium-driven nutrient pattern and telomere length: the chain mediating role of diastolic pressure and waist circumference
Authors: Xing Baodi , Yu Jie , Liu Yiwen , He Shuli , Gao Qi , Chen Xinyue , Ping Fan , Xu Lingling , Li Wei , Zhang Huabing , Li Yuxiu
Published: October 2024

Background

Numerous single nutrients have been suggested to be linked with leukocyte telomere length (LTL). However, data on nutrient patterns (NPs), particularly in Chinese population, are scarce. This study aimed to examine the relationship between nutrient-based dietary patterns and LTL, and the potential role of metabolic factors.

Methods

Dietary data was obtained via 24-hour food recalls, and principal component analysis (PCA) was used to identify NPs. LTL was assessed using a real-time PCR assay. Multiple linear regression was conducted to determine the association between NPs and LTL. The potential role of metabolism among them was analyzed using mediation models.

Results

A total of 779 individuals from northern China were included in this cross-sectional analysis. Five main nutrient patterns were identified. Adjusted linear regression showed that the “high sodium” pattern was inversely associated with LTL (B=-0.481(-0.549, -0.413), P < 0.05). The “high vitamin E-fat” pattern exhibited a positive correlation (B = 0.099(0.029, 0.170), P < 0.05), whereas the “high vitamin A-vitamin B2” pattern was negatively correlated with LTL (B=-0.120(-0.183, -0.057), P < 0.05), respectively. No significant associations were observed for the remaining nutrient patterns. The mediation model demonstrated that diastolic blood pressure and waist circumference could individually and collectively mediate the negative impact of the “high sodium” pattern on LTL (BDBP=-0.0173(-0.0333, -0.0041), BWC=-0.0075(-0.0186, -0.0004), Bjoint=-0.0033 (-0.0072, -0.0006), all P < 0.05). Moreover, glycosylated hemoglobin and non-high-density lipoprotein cholesterol mediate the relationship between the “high vitamin E-fat” pattern and LTL (BHbA1c=0.0170(0.0010,0.0347), Bnon-HDL-C= 0.0335 (0.0067, 0.0626), all P < 0.05), respectively.

Conclusions

The “high sodium” and “high vitamin E-fat” nutrient patterns demonstrated negative and positive associations with LTL and metabolic indicators may play complex mediating roles in these relationships.
A systematic review and network meta-analysis on the optimal wavelength of low-level light therapy (LLLT) in treating knee osteoarthritis symptoms
Authors: Fan Tianxiang , Li Yang , Wong Arnold Y. L. , Liang Xiao , Yuan Yarou , Xia Peng , Yao Zhi , Wang Deli , Pang Marco Y. C. , Ding Changhai , Zhu Zhaohua , Li Ye , Fu Siu Ngor
Published: October 2024

Objectives

To compare the efficacy of the various wavelengths of low-level light therapy (LLLT) in alleviating knee pain, dysfunction, and stiffness in patients with knee osteoarthritis (KOA), and to compare the effectiveness of LLLT versus sham treatment in reducing knee pain, dysfunction, and stiffness.

Methods

PubMed, Web of Science, EMBASE, and Cochrane Library were searched from inception to 12 December 2023. Randomized controlled trials that assessed the effects of different wavelengths of LLLT on alleviating pain of patients with KOA were included. A conventional meta-analysis and network meta-analysis were preformed, and standardized mean differences (SMD) with 95% confidence interval (CI) were calculated.

Results

Thirteen studies involving 673 participants with KOA met inclusion criteria. Overall, LLLT was superior to sham LLLT for relieving pain (SMD = 0.96, 95% CI 0.31–1.61) but not for improving function (SMD = 0.21, 95% CI − 0.11 to 0.53) or stiffness (SMD = 0.07, 95% CI − 0.25 to 0.39). Surface under the cumulative ranking curve (SUCRA) value ranking showed the most effective wavelength of LLLT in reducing KOA pain was 904–905 nm (SUCRA, 86.90%), followed by multi-wavelengths (MWL) (SUCRA, 56.43%) and 785–850 nm (SUCRA, 54.97%). Compared to sham LLLT, L2 (SMD = 1.42, 95% CI = 0.31–2.53) and L1 (SMD = 0.82; 95% CI = 0.11–1.50) showed a significant reduction in KOA pain. However, MWL (SMD = 0.83; 95% CI = − 0.06 to 1.72) showed similar KOA pain reduction compared to sham LLLT. The certainty of evidence showed that the quality of evidence regarding the effectiveness of overall LLLT versus sham, and 904–905 nm versus sham were low, while the quality of evidence for MWL versus sham, and 785–850 nm versus sham was very low.

Conclusion

While the 904–905 nm wavelength showed potential benefits in reducing KOA pain, the overall quality of the evidence was low. LLLT with 904–905 nm or 785–850 nm wavelengths yielded significantly better reduction in KOA pain compared to sham LLLT, but further high-quality research is warranted to validate these findings.
Iron-oxide-nanoparticle-tagged Mesenchymal Stem Cell Exosomes in Therapeutics
Authors: Mehta Kosha J.
Published: October 2024

Purpose of Review

Mesenchymal Stromal/Stem Cells (MSCs) include a population of cells that are predominantly stromal cells with a small fraction of mesenchymal stem cells that demonstrate stem-cell like properties. MSCs have great therapeutic potential but are not used frequently in clinical settings because of methodological challenges posed at pre-transplantation stages, issues during post-transplantation detection, and the accompanying risks of tumorigenicity, immunogenicity and toxicity. Labelling MSCs with iron-oxide nanoparticles (IONPs) has shown promising results but it is not problem-free. This article highlights the utility of IONP-tagged MSC-derived exosomes in facilitating MSC therapeutics.

Recent Findings

To circumvent the issues associated with cell-based therapy, researchers have contemplated using a cell-free approach. MSC-derived exosomes are nanovesicles that contain beneficial biomolecules, and transplantation with these exosomes offers several procedural and physiological advantages over transplantation with parent MSCs. Notably, tagging these MSC-exosomes with IONPs leads to better guidance of these exosomes, and therefore, their therapeutic factors towards target cells, increased ability of exosomes to carry large amounts of therapeutic biomolecules, increased accumulation of exosomes at target site, increased expression of endogenous growth factors and increased therapeutic efficacy. Administration of IONP-tagged MSC-exosomes into animal models of spinal cord injury, ischemic stroke, myocardial infarction, and cancer has shown promising results such as enhanced angiogenesis, and reduction in inflammation, cell apoptosis, fibrosis, toxicity and/or tumour growth.

IONP-tagged MSC-derived exosomes show potential for disease amelioration. Further investigation is needed to address the challenges posed by this approach, including hemocompatibility issues to ensure patient safety and treatment efficacy.
Social Justice Imaginaries and Education Policy in Aotearoa New Zealand (2017–2024)
Authors: Estellés Marta , O’Neill John
Published: October 2024

In this article, we continue Martin Thrupp’s critical work in education policy in Aotearoa New Zealand by examining the policies of the Sixth Labour-led Government (2017–2023) and the Sixth National-led Government (2023-present). We consider their attempts to mitigate social injustice via education policy and the social imaginaries that underpin such efforts. Our conceptual framework draws on Nancy Fraser’s tripartite analysis (redistribution, recognition, participation), the contributions of education policy scholars who have built upon her work, and others who offer alternative framings of social justice. To contextualise our analysis, we provide a historical account of the discursive shift from equality to equity in New Zealand education policy and the recent transition by the Left from the ‘Third Way’ (Giddens, The third way: The renewal of social democracy, Polity Press, 1999) to ‘progressive neoliberalism’ (Fraser, American Affairs 1:46–64, 2017, Fraser, The old is dying and the new cannot be born: From progressive neoliberalism to Trump and beyond, Verso, 2019). Examination of selected education policies by the most recent Labour and National governments reveals that, despite equity infusing the rhetoric of both governments, their actual policies have consistently adopted affirmative responses aimed only at ameliorating inequality’s most visible effects. We conclude with a call for more intentionally transformative efforts in education based on holistic conceptions of social justice.
Effects of Attachment Design and Aligner Material on Mandibular Canine Distal Bodily Movement in Aligner Treatment
Authors: Chen Pin-Yu , Huang Heng-Li , Yu Jian-Hong , Hsu Jui-Ting
Published: October 2024

Purpose

Dental crowding is a result of a mismatch between tooth size and arch dimensions, which leads to malocclusion; treatment often involves premolar extraction before orthodontic alignment. Clear aligners are limited in their ability to achieve canine distal bodily movement, a common orthodontic maneuver. This study investigated the impacts of attachment design and aligner material on the efficacy of canine distal bodily movement.

Methods

A finite element analysis was conducted to examine the impact of various attachment designs and two aligner materials, thermoplastic polyurethanes/polycarbonate (TPU/PC) and polyethylene terephthalate glycol-modified (PETG), on mandibular canine distal bodily movement. The investigation focused on the biomechanical responses in the periodontal ligament (PDL) and surrounding alveolar bone.

Results

Attachment configuration exerted a strong influence on mandibular canine movement. Vertically oriented attachment pairs positioned mesially (mesial occlusal–mesial cervical) resulted in the most effective canine distal bodily movement, followed by a rectangular attachment. TPU/PC aligners induced slightly higher principal stresses in the PDL and von Mises stress and strain in the surrounding alveolar bone compared with PETG aligners; however, the difference was negligible, amounting to less than 6%.

Conclusion

Attachment design, specifically vertically oriented pairs positioned mesially (mesial occlusal–mesial cervical), was determined to be the crucial factor influencing the efficacy of canine distal bodily movement. The choice of aligner material (TPU/PC or PETG) has minimal impact on this orthodontic procedure.
Frontiers in construction 3D printing: self-monitoring, multi-robot, drone-assisted processes
Authors: Li Shuai , Lan Tian , Nguyen Hung-Xuan , Tran Phuong
Published: October 2024

To overcome productivity issues and revolutionize the stagnating construction industry, a large amount of research efforts has been devoted to robot-assisted construction technology. The advancements in robotics including mechanical system design, tool design, digital system design, and numerical control systems design enabled engineers to create complex geometries that are infeasible for conventional construction methods. In addition, innovative robotic systems that utilize mobile platforms, multiple robots, and unmanned aerial vehicles have demonstrated significant promise in fully automating the construction process. This work will provide a perspective on the state-of-the-art applications of robotics in the revolution of construction, where a comprehensive review of the current development of the relevant software and hardware, 3D concrete printing (3DCP), robot-assisted assembly of discrete prefabricated blocks, real-time quality monitoring and feedback control systems, and typical innovative robot-assisted structural designs are conducted. Finally, the limitations of existing robot-assisted construction technology are identified, which leads to several recommendations for future research toward fully automatic construction.
Raised by White People. Conceptualisations of ‘Culture’ in the Foster Placement of African Minority Youth in Norway
Authors: Wathne K.
Published: October 2024

This paper examines the intricate dynamics of transethnic foster placement in Norway, focusing on African minority youth and how ‘culture’ and ‘identity’ is conceptualised within this context. Through semi-structured interviews, the study builds on the lived experiences of a set of 15 families (including 60 children), alongside insights from fostered individuals, foster parents, and a placement official. The discussion delves into the profound effects of cultural dislocation and identity crisis experienced by minority youth, problematising how foster placement often leads to adverse life trajectories, including issues with uprootedness, substance abuse, psychiatric illness, and loss of ethnic identity. At the core of the discussion is the contention that while the child protection system in Norway is mandated to safeguard children, it inadvertently neglects the cultural rights and identity development of African minority youth. Employing insight from Franz Fanon and Jean-Paul Sartre to articulate the psychological impact and moral implications of such transethnic placements, the paper argues for re-evaluating assimilation practices and cultural rights within the child protection framework, highlighting the need for a culturally sensitive and rights-based approach to foster care. This research contributes to the broader discourse on human rights and social work, emphasising the ethical and legal dimensions of fostering minority children.
Does user-generated content influence value co-creation in the context of luxury fashion brand communities? Matching inclusivity and exclusivity
Authors: Basile Vincenzo , Brandão Amélia , Ferreira Mariana
Published: October 2024

Given the rise of digital technologies, brands must retain complete control and accountability for user content creation and diffusion. This paper investigates the influence of user-generated content on multiple luxury consumers’ value perceptions that arise within brand communities. A type of non-participatory netnography is performed on three fashion brand communities to analyze the content published by community members non-intrusively. Findings show that brand-related content allows users to share their perceived experiential benefits with their networks, ultimately reinforcing the brand’s experiential and symbolic dimensions. Moreover, user content influences one’s perception of value and attitude. However, if the sense of social homophily and membership is evident, diminishing a brand’s perceived value through brand dilution is unlikely. While previous studies revising the outcomes of online exposure for luxury firms have primarily focused on firm-controlled messages, this investigation acknowledges the importance of brand communities in creating and spreading brand-related content and their effect on luxury appeals. This study appears timely as the digital era empowers consumers to be proactive in Value Co-Creation dynamics and freely define the meaning of inclusivity in exclusive luxury.
Ocean Alkalinity Enhancement in Deep Water Formation Regions Under Low and High Emission Pathways
Authors: Nagwekar Tanvi , Nissen Cara , Hauck Judith
Published: October 2024

Ocean Alkalinity Enhancement (OAE) is an ocean‐based Carbon Dioxide Removal (CDR) method to mitigate climate change. Studies to characterize regional differences in OAE efficiencies and biogeochemical effects are still sparse. As subduction regions play a pivotal role for anthropogenic carbon uptake and centennial storage, we here evaluate OAE efficiencies in the subduction regions of the Southern Ocean, the Northwest Atlantic, and the Norwegian‐Barents Sea region. Using the ocean biogeochemistry model FESOM2.1‐REcoM3, we simulate continuous OAE globally and in the subduction regions under high (SSP3‐7.0) and low (SSP1‐2.6) emission scenarios. The OAE efficiency calculated by two different metrics is higher (by 8%–30%) for SSP3‐7.0 than for SSP1‐2.6 due to a lower buffer factor in a high‐ world. All subduction regions show a CDR potential (0.23–0.31; PgC uptake per Pg alkaline material) consistent with global OAE for both emission scenarios. Calculating the efficiency as the ratio of excess dissolved inorganic carbon (DIC) to excess alkalinity shows that the Southern Ocean and the Northwest Atlantic are as efficient as the global ocean (0.79–0.85), while the Norwegian‐Barents Sea region has a lower efficiency (0.65–0.75). The subduction regions store a fraction of excess carbon below 1 km that is 1.9 times higher than the global ocean. The excess surface alkalinity and thus uptake and storage follow the mixed‐layer depth seasonality, with the majority of the excess flux occurring in summer at shallow mixed layer depths. This study therefore highlights that subduction regions can be efficient for OAE if optimal deployment strategies are developed.
Permafrost Degradation Induces the Abrupt Changes of Vegetation NDVI in the Northern Hemisphere
Authors: Yang Yanpeng , Wang Xufeng , Wang Tonghong
Published: October 2024

Permafrost, widely distributed in the Northern Hemisphere, plays a vital role in regulating heat and moisture cycles within ecosystems. In the last four decades, due to global warming, permafrost degradation has accelerated significantly in high latitudes and altitudes. However, the impact of permafrost degradation on vegetation remains poorly understood to date. Based on active layer thickness (ALT) monitoring data, meteorological data and normalized difference vegetation index (NDVI) data, we found that most ALT‐monitored sites in the Northern Hemisphere show an increasing trend in NDVI and ALT. This suggests an overall increase in NDVI from 1980 to 2021 while permafrost degradation has been occurring. Permafrost degradation positively influences NDVI growth, with the intensity of the effects varying across land cover types and permafrost regions. Furthermore, based on Mann‐Kendall trend test, we detected abrupt changes in NDVI and environmental factors, further confirming that there is a strong consistency between the abrupt changes of ALT and NDVI, and the consistency between the abrupt change events of ALT and NDVI is stronger than that of air temperature and precipitation. These findings work toward a better comprehending of permafrost effects on vegetation growth in the context of climate change.
The Distribution of Surface Heat Flow on the Tibetan Plateau Revealed by Data‐Driven Methods
Authors: Zhang Zhengliang , Wu Sensen , Zhang Baohua , Du Zhenhong , Xia Qunke
Published: October 2024

Surface heat flow (SHF) serves as a vital parameter for assessing the heat transfer from deep Earth to the surface, which can provide crucial insights into internal geodynamic processes. As the “roof of the world,” the Tibetan Plateau and its tectonic evolution are highly important in terms of global climate change and geodynamic study. However, a comprehensive understanding of the SHF distribution across most regions of the Tibetan Plateau is limited due to sparse measurement data. To surmount this limitation, a spatially intelligent approach has been developed: The geographically neural network weighted regression with enhanced interpretability (EI‐GNNWR). This method integrates spatial heterogeneity and nonlinear interactions between geophysical and geological factors to predict the SHF distribution across the Tibetan Plateau. In this study, the EI‐GNNWR model is used to accurately predict SHF across the entire region. After evaluating the effectiveness and interpretability of the EI‐GNNWR model, our results demonstrate that medium to high SHF values are predominantly concentrated in the southern, northeastern, and southeastern sectors of the Tibetan Plateau. These observations suggest that the formation of zones with high SHF values may be strongly influenced by the Moho depth, ridges, topography, and average curvature of satellite gravity gradients. Especially, higher SHF values may indicate more profound geodynamic activities such as collisional orogeny, shear deformation zones, or lithospheric extension. These findings offer novel insights into the spatial patterns of SHF and deepen our understanding of the geothermal formation mechanisms driven by underlying tectonic activities.
Predicting Characteristic Length Scales of Barrier Island Segmentation in Microtidal Environments
Authors: Palermo R. V. , Ashton A. D. , Nepf H. , Kule M. , Swanson T.
Published: October 2024

Segmented barrier islands can be found in regions with small tidal ranges. In contrast to tidally dominated barriers, where inlet dynamics are thought to control island length scales, the controls on barrier island length scales in wave‐dominated environments have not been quantified. These microtidal barriers typically have a curved shoreline, suggesting the influence of wave‐driven alongshore sediment transport. Microtidal barriers are also typically hydrodynamically isolated from one another, as weak tidal flows limit interactions between adjoining barriers. To better understand the controls on and scales of barrier segmentation in the relative absence of tides, here we develop a theoretical framework to estimate the alongshore length scales at which a barrier will either breach or heal following a disturbance in the barrier morphology. The non‐dimensional framework compares the timescales of overwash (advective) and alongshore sediment transport (diffusive) processes along barrier island chains. We then apply this framework to modern barrier islands in the microtidal Gulf of Mexico using wave hindcast data and the lengths, widths, heights, and lagoon depths measured from remotely sensed geospatial data and topobathymetric data. We find that most of these barriers are currently longer than their critical length scale, often as a result of coastal restoration efforts. Our critical length scale analysis suggests that most of the Gulf of Mexico barriers are vulnerable to segmentation despite coastal restoration efforts intended to protect fisheries and the mainland coasts.
TC‐GEN: Data‐Driven Tropical Cyclone Downscaling Using Machine Learning‐Based High‐Resolution Weather Model
Authors: Jing Renzhi , Gao Jianxiong , Cai Yunuo , Xi Dazhi , Zhang Yinda , Fu Yanwei , Emanuel Kerry , Diffenbaugh Noah S. , Bendavid Eran
Published: October 2024

Synthetic downscaling of tropical cyclones (TCs) is critically important to estimate the long‐term hazard of rare high‐impact storm events. Existing downscaling approaches rely on statistical or statistical‐deterministic models that are capable of generating large samples of synthetic storms with characteristics similar to observed storms. However, these models do not capture the complex two‐way interactions between a storm and its environment. In addition, these approaches either necessitate a separate TC size model to simulate storm size or involve post‐processing to capture the asymmetries in the simulated surface wind. In this study, we present an innovative data‐driven approach for TC synthetic downscaling. Using a machine learning‐based high‐resolution global weather model (ML‐GWM), our approach can simulate the full life cycle of a storm with asymmetric surface wind that accounts for the two‐way interactions between the storm and its environment. This approach consists of multiple components: a data‐driven model for generating synthetic TC seeds, a blending method that seamlessly integrates storm seeds into the surrounding while maintaining the seed structure, and a model based on a recurrent neural network to correct for biases in storm intensity. Compared to observations and synthetic storms simulated using existing statistical‐deterministic and statistical downscaling approaches, our method shows the ability to effectively capture many aspects of TC statistics, including track density, landfall frequency, landfall intensity, and outermost wind extent. Leveraging the computational efficiency of ML‐GWM, our approach shows substantial potential for TC regional hazard and risk assessment.
Comprehensive Study of Large‐Scale Traveling Ionospheric Disturbances (LSTIDs) Observed Over Iran
Authors: Vazifehkhah Hafteh M. , Mahmoudian A.
Published: October 2024

A dense network of GNSS receivers is employed to study temporal and spatial characteristics of large‐scale traveling ionospheric disturbances (LSTIDs) in Iran. Three geomagnetic storms in 2021 are selected. To determine LSTID propagation, an eighth‐order Butterworth bandpass filter was applied to the data to remove the diurnal variability of the total electron content (TEC). Moreover, two‐dimensional TEC perturbation maps are provided to explore the meridional and zonal structures of the LSTIDs. Analysis of a major storm on November 4 (Kp = 7, Dst = −99 nT) revealed two single LSTIDs and three groups of multiple LSTIDs. The phase velocity and wavelength of LSTIDs in this event varied between 190 and 930 m/s and 1,030–5,022 km, respectively. Southward propagating LSTIDs appeared to be more frequent than northward. The complex propagation of two simultaneous LSTIDs is resolved. A large‐amplitude mixed front showing broadening both latitudinally and meridionally is revealed. No nighttime propagating LSTID is reported. In addition, global differential TEC data are explored to examine the detection of LSTID propagation. The global data validates the timing, direction of propagation, and strength of LSTIDs detected over Iran. The auroral oval extension is consistent with generating and propagating reported LSTIDs. The second storm studied occurred on August 27 (Kp = 4, Dst = −82 nT). This storm exhibited weaker LSTIDs in terms of both observed numbers and amplitude. Finally, the storm case of May 12 (Kp = 7, Dst = −61 nT) was examined. The results underscores the vital role of the Dst index in studying LSTIDs.
Iron-Rich Volcanoes Hold Hidden Rare Earth Element Reserves
Authors: Cartier Kimberly
Published: October 2024

Experiments show how concentrations of rare earth elements, critical to the green energy transition, might be hiding in plain sight in iron-rich deposits around the world.
Soil Carbon Accumulation Under Afforestation Is Driven by Contrasting Responses of Particulate and Mineral‐Associated Organic Carbon
Authors: Zhai Deping , Wang Yiyue , Liao Chang , Men Xiuxian , Wang Chi , Cheng Xiaoli
Published: October 2024

Afforestation is widely believed to sequester carbon (C) in soil. However, the effect of afforestation on soil organic C (SOC) accumulation is still debated due to the contrasting features of particulate and mineral‐associated organic C (POC and MAOC). We conducted a field investigation of 144 paired sampling sites by comparing afforested and non‐afforested lands to investigate the POC and MAOC dynamics after afforestation across the Danjiangkou basin in subtropical China, where forests are dominated by Platycladus orientalis, Quercus variabilis and Pinus massoniana. The average contents of SOC, POC, and MAOC were significantly increased by afforestation; however, POC and MAOC responded differently to afforestation type. All afforestation types promoted the POC content, and MAOC also showed positive responses to afforestation except that afforestation with P. massoniana from shrubland significantly reduced the MAOC content. With increasing SOC content, the POC grew at a faster rate than MAOC at high SOC levels. Afforestation hindered the growth rate of POC, while it promoted the growth rate of MAOC as SOC accrued, which potentially obscured the distinct patterns of C accumulation triggered by afforestation. The variation partitioning suggests that, under afforestation, microbial traits had a higher contribution to both POC and MAOM variations compared with non‐afforested land. These results suggest that the robust buildup of microbial biomass due to increased plant C input following afforestation could contribute to soil C accumulation by promoting microbial necromass.
The Silent VOICE—Searching for Geochemical Markers to Track the Impact of Late Jurassic Rift Tectonics
Authors: Galloway Jennifer M. , Hadlari Thomas , Dewing Keith , Poulton Terence , Grasby Stephen E. , Reinhardt Lutz , Rogov Mikhail , Longman Jack , Vickers Madeleine
Published: October 2024

A causal mechanism for the Volgian Isotopic Carbon Excursion (VOICE) remains enigmatic. Elemental geochemical profiles of the Deer Bay Formation, Sverdrup Basin, Arctic Canada that record the VOICE and contemporaneous strata are herein examined to provide insight into depositional environments during Late Jurassic‐Early Cretaceous time. Silver (Ag) and Cadmium (Cd) are enriched across the VOICE at localities on Axel Heiberg Island, and in Tithonian (∼Volgian) strata of Ellef Ringnes Island. Other redox‐sensitive trace elements do not exhibit spatially or temporally consistent patterns and indicate oxic conditions. A lack of relationship across the VOICE between Ag and the quality, quantity, and isotopic composition of organic matter suggests that the negative isotope excursion and interval of Ag enrichment are not merely functions of changes in organic matter source or amount, while a lack of spatially consistent change in geochemical indices of weathering similarly excludes climate change and/or sediment provenance as a driver. Therefore, in a ventilated setting and without marked changes in organic matter content, Ag enrichment may be due to hydrothermal activity. Contemporaneous Ag enrichment in strata from Svalbard suggests that a source of hot fluid sufficient to produce Ag‐rich seawater may have been related to rifting in the adjacent proto‐Amerasia Basin. Hydrothermal activity may also have been a widespread source of isotopically depleted carbon. This work develops new geochemical fingerprints that may be used to trace the spatial extent of hydrothermal events that do not leave an extinction pattern but may nonetheless have a far‐reaching influence on biogeochemical systems.
Obtaining High‐Resolution Magnetic Records From Speleothems Using Magnetic Microscopy
Authors: Borlina Cauê S. , Lima Eduardo A. , Feinberg Joshua M. , Jaqueto Plinio , Lascu Ioan , Trindade Ricardo I. F. , Font Eric , Sánchez‐Moreno Elisa M. , Dimuccio Luca Antonio , Yokoyama Yusuke , Parés Josep M. , Weiss Benjamin P. , Dorale Jeffrey A.
Published: October 2024

Speleothems are mineral deposits capable of recording detrital and/or chemical remanent magnetization at annual timescales. They can offer high‐resolution paleomagnetic records of short‐term variations in Earth's magnetic field, crucial for understanding the evolution of the dynamo. Owing to limitations on the magnetic moment sensitivity of commercial cryogenic rock magnetometers (∼10−11 Am2), paleomagnetic studies of speleothems have been limited to samples with volumes of several hundreds of mm3, averaging tens to hundreds of years of magnetic variation. Nonetheless, smaller samples (∼1–10 mm3) can be measured using superconducting quantum interference device (SQUID) microscopy, with a sensitivity better than ∼10−15 Am2. To determine the application of SQUID microscopy for obtaining robust high‐resolution records from small‐volume speleothem samples, we analyzed three different stalagmites collected from Lapa dos Morcegos Cave (Portugal), Pau d'Alho Cave (Brazil), and Crevice Cave (United States). These stalagmites are representative of a range of magnetic properties and have been previously studied with conventional rock magnetometers. We show that by using SQUID microscopy we can achieve a five‐fold improvement in temporal resolution for samples with higher abundances of magnetic carriers (e.g., Pau d'Alho Cave and Lapa dos Morcegos Cave). In contrast, speleothems with low abundances of magnetic carriers (e.g., Crevice Cave) do not benefit from higher resolution analysis and are best analyzed using conventional rock magnetometers. Overall, by targeting speleothem samples with high concentrations of magnetic carriers we can increase the temporal resolution of magnetic records, setting the stage for resolving geomagnetic variations at short time scales.
Oriented Acicular Rutile Inclusions in Eclogites: Exsolutions From Majoritic Garnet or Shock Needles?
Authors: Yang Jian‐Jun , Xu Hai‐Jun , Hirajima Takao
Published: October 2024

Oriented rutile needles (ORNs) forming a triangular network on the cross sections of garnet crystals have been widely used together with omphacite inclusions as evidence for exsolution from a majoritic garnet and exhumation of the host rocks from great depths (>200 km) in the Earth. A coronitic eclogite at Yangkou in the Chinese Su‐Lu high‐pressure metamorphic belt contains ORNs that are only found in the reddish cores of garnet porphyroblasts. The texture formed by the ORNs is not restricted to garnet but extends into the coexisting other minerals, which together form pseudomorphs after augite. Therefore, the ORNs are not specifically related to the host garnet and cannot be exsolutions therefrom. The outer zones of the garnet porphyroblasts in contact with plagioclase pseudomorphs are pale and rutile‐free but contain minute inclusions of omphacite, quartz, kyanite, phengite, and K‐feldspar, typical of coronitic garnet between augite and plagioclase. Electron backscatter diffraction reveals no optimum matching of the low index crystallographic directions of rutile and garnet as required by an exsolution mechanism. On the other hand, the ORNs resemble the amorphous lamellae in quartz and zircon in meteorite and seismic shocked rocks, and are inferred to have crystallized earlier in seismic shocked augite and were then overgrown by the host minerals. By contrast, the rutile particles in garnet cataclasites in a nearby eclogite breccia display deformed and explosive patterns and random crystallographic orientations. All these observations are best explained by the seismic shock compression and rarefaction scenario proposed earlier.
Spread or Splash: The Ubiquitous Role of Droplets in Mafic Explosive Eruptions
Authors: Comida Pier Paolo , Jones Thomas J.
Published: October 2024

Magma fragmentation is an essential process driving explosive volcanic eruptions, generating a distribution of pyroclasts with characteristic shape and grain size. These characteristics are often used to inform on the energetics of magma fragmentation and the associated eruption style and intensity. However, a portion of these pyroclasts, droplets when still in the molten state, are likely to be generated through impact mechanisms (i.e., collisions), and subsequent secondary fragmentation (i.e., splashing). Here, we successfully apply and dynamically scale concepts and findings of liquid droplet impacts in engineering to magma fragmentation processes in volcanology. We compile and model physical data for two mafic melt compositions (kimberlite and basalt) and use specific eruption examples from Igwisi Hills, Kīlauea and Stromboli volcanoes to define composition‐specific impact dynamics. Pyroclast impact dynamics have a direct control on in‐conduit processes, eruption dynamics, and ash dispersal. For low viscosity mafic melts such as kimberlite and basalt, pyroclast impacts can lead to both splash and deposition on the conduit wall, resulting either in conduit clearing or conduit narrowing, respectively. In both cases, shifting the impact regime toward surface deposition will lead to an inexorable decay in explosiveness, potentially switching the eruption style to effusive behavior. This has direct consequences for the transport of volcanic ash at the surface and inferring magma fragmentation processes (e.g., energies) from the depositional record.
The Impact of Wildfire Smoke on Asthma Control in California: A Microsimulation Approach
Authors: Maya Sigal , Thakur Neeta , Benmarhnia Tarik , Weiser Sheri D. , Kahn James G.
Published: October 2024

Wildfire smoke exposure leads to poorer health among those with pre‐existing conditions such as asthma. Particulate matter in wildfire smoke can worsen asthma control, cause acute exacerbations, and increase health resource utilization (HRU) and costs. Research to date has been retrospective with few opportunities to project changes in underlying asthma control and HRU given exposure to wildfire smoke. Using a microsimulation of 5,000 Californians with asthma, we calculated changes in asthma control distribution, risk of exacerbation, and HRU and cost outcomes in the 16 weeks during and after a wildfire. The model was calibrated against empirical values on asthma control distribution and increased HRU after exposure to wildfire smoke. Without smoke exposure, 48% of the cohort exhibited complete or well control of asthma, and 8% required acute healthcare per cycle. Following two consecutive weeks of wildfire smoke, complete or well control of asthma fell to 27%, with an additional 4% HRU. This corresponds to total additional $601,250 in all‐cause medical costs and eight fewer quality‐adjusted life years over 16 weeks of model time. Our model found increased asthma health and cost burden due to wildfire smoke that were aligned with empirical evidence from a historic wildfire event. This study establishes a framework for a more nuanced understanding of asthma impacts from wildfire smoke that can help inform the development of public health policies to mitigate harm and promote resilience among asthma patients in the face of climate change.
Reimei Satellite Observations of Alfvénic Interaction Modulating Inverted‐V Electrons and Filamentary Auroral Forms at the Poleward Edge of a Discrete Arc
Authors: Hirahara Masafumi , Ebihara Yusuke , Kitamura Naritoshi , Sakanoi Takeshi , Asamura Kazushi , Takada Taku , Saito Hirobumi
Published: October 2024

We present an event based on Reimei satellite observations in the low‐altitude midnight auroral region, showing that intense and clear energy‐dispersed electron precipitations, repetitively generated by field‐aligned accelerations due to dispersive Alfvén waves, were modulating inverted‐V electrons. These Alfvénic electrons had peak energies equal to or slightly larger than those of the inverted‐Vs and were associated with the filamentary auroral forms rapidly streaming at the poleward edge of a broad discrete arc. This arc was caused by the inverted‐V accompanied by ion depletions produced by quasi‐electrostatic parallel potential drop. Assuming instantaneous electron accelerations over a wide energy range in a single location and a simple time‐of‐flight effect for the energy‐time dispersions, the Alfvénic source distances were estimated 1,500 ± 500 km above the satellite altitude of ∼676 km, a lower bound since the interaction locations are realistically distributed in altitudinally extended regions. The electron characteristics in detailed energy‐pitch angle distributions obtained at high time resolution can be categorized into: (a) original inverted‐V fluxes energized by quasi‐electrostatic upward electric field, (b) accelerated and decelerated/reduced inverted‐V fluxes, (c) field‐aligned energy‐dispersed precipitations accelerated by dispersive Alfvén waves, and (d) upwelling secondary components effectively produced by the field‐aligned precipitations particularly at energies of a few tens of eV. This event is useful to reveal the interactions between the inverted‐V and Alfvénic electrons and their related ionospheric effects in the magnetosphere‐ionosphere coupling processes. The detailed energy‐pitch angle distributions presented here provide constraints for models of these interactions and processes.
A Statistical Examination of Interactions Between 1‐Hz Whistler Waves and Ions in the Earth's Foreshock
Authors: Wang Shan , Li Jing‐Huan , Li Li , Zhou Xu‐Zhi , Omura Yoshiharu , Zhao Jiu‐Tong , Liu Zhi‐Yang , Zong Qiu‐Gang , Zhang Hui , Yue Chao
Published: October 2024

The 1 Hz whistler wave precursors attached to shock‐like structures are often observed in the foreshock. Using observations from the Magnetospheric Multiscale mission, we investigate the interactions between 1 Hz waves and ions. Incoming solar wind ions do not cyclotron‐resonate with the wave, since typically the wave is right‐handed in their frame. We demonstrate that solar wind ions commonly exhibit 180° gyro‐phase bunching from the wave magnetic field, understanding it with a reconciled linear theory and non‐linear trapping theory for non‐cyclotron‐resonant modulations. Along the longitudinal direction, solar wind ions experience Landau resonance, exhibiting either modulations at small wave potentials or trapping in phase‐space holes at large potentials. The results also improve our understanding of foreshock structure evolution and 1 Hz wave excitation. Shock‐like structures start with having incoming solar wind and remotely reflected ions from further downstream. The ion‐scale 1 Hz waves can already appear during this stage. The excitation may be due to shock‐like dispersive radiation or kinetic instabilities resonant with these remotely reflected ions. Ions reflected by local shock‐like structures occur later, so they are not always necessary for generating 1 Hz waves. The wave leads to ion reflection further upstream, which may cause reformation of shock‐like structures. In one event, locally reflected ions exhibit non‐cyclotron‐resonant modulation in the early stage, and later approach the anomalous cyclotron resonant condition with gyro‐phases ∼270°. The latter is possibly due to nonlinear trapping in regions with an upstream‐pointing magnetic field gradient, linked to reformation. Some additional special features, such as frequency dispersions, are observed, encouraging further investigations.