bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation for doctoral research: a narrative review
Authors: McDowall Ailie , Ramos Fabiane
Published: May 2023

In Australia, only two-thirds of doctoral students finish their degrees, with underrepresented students completing at even lower rates. Students who successfully complete still experience many challenges throughout their degrees. In this narrative literature review, we use preparation and readiness for the doctorate as a framework to examine how students are prepared for studies at the doctoral level, the challenges they experience, and the support that universities provide. We also weave our own stories of the doctorate to demonstrate how the issues raised in the literature play out for doctoral students. Our findings suggest that how students are prepared for the doctorate remains under-researched, with much of the literature focusing on issues that emerge once students commence, and the supports that are provided in response to these challenges. A future focus on preparation may provide insight into how institutional processes can better support doctoral students to successfully complete their degrees.
“What’s going on in my body?”: gaps in menstrual health education and face validation of My Vital Cycles®, an ovulatory menstrual health literacy program
Authors: Roux Felicity , Burns Sharyn , Hendriks Jacqueline , Chih HuiJun
Published: May 2023

There is a high prevalence of adolescent girls with ovulatory menstrual (OM) dysfunction, which is associated with school absenteeism and mental health challenges. Low menstrual health literacy among this group has evoked calls to review OM health education. This qualitative study sought to explore gaps in current OM health education and to validate a holistic school-based OM health literacy program named My Vital Cycles®. Findings are based on 19 written reflections, six focus group discussions and three interviews conducted with 28 girls aged 14–18 years from 11 schools, and five mothers. Six themes compared current OM health education with My Vital Cycles®: understating health, comprehensiveness, resources, teaching, parents and cycle tracking. Future refinements to the program comprised: inclusion of the complete reproductive lifespan, use of visual media and developing a mobile application. These findings inform future research in a whole school approach, strengths-based teaching and changes in the health curriculum.
Quality of life in children and adolescents with growth hormone deficiency and their caregivers: an Italian survey
Authors: Maghnie M. , Orso M. , Polistena B. , Cappa M. , Pozzobon G. , d’Angela D. , Patti G. , Spandonaro F. , Granato S. , Di Virgilio R. , La Torre D. , Salerno M.
Published: May 2023

Purpose

The aim of this study was to produce evidence on quality of life (QoL) among Italian growth hormone deficiency (GHD) children and adolescents treated with growth hormone (GH) and their parents.

Methods

A survey was conducted among Italian children and adolescents aged 4–18 with a confirmed diagnosis of GHD and treated with GH therapy and their parents. The European Quality of Life 5 Dimensions 3 Level Version (EQ-5D-3L) and the Quality of Life in Short Stature Youth (QoLISSY) questionnaires were administered between May and October 2021 through the Computer-Assisted Personal Interview (CAPI) method. Results were compared with national and international reference values.

Results

The survey included 142 GHD children/adolescents and their parents. The mean EQ-5D-3L score was 0.95 [standard deviation (SD) 0.09], while the mean visual analogue scale (VAS) score was 86.2 (SD 14.2); the scores are similar to those of a reference Italian population aged 18–24 of healthy subjects. As for the QoLISSY child-version, compared to the international reference values for GHD/ idiopathic short stature (ISS) patients, we found a significantly higher score for the physical domain, and lower scores for coping and treatment; compared to the specific reference values for GHD patients, our mean scores were significantly lower for all domains except the physical one. As for the parents, we found a significantly higher score for the physical domain, and a lower score for treatment; compared to reference values GHD-specific, we found lower score in the social, emotional, treatment, parental effects, and total score domains.

Conclusions

Our results suggest that the generic health-related quality of life (HRQoL) in treated GHD patients is high, comparable to that of healthy people. The QoL elicited by a disease specific questionnaire is also good, and comparable with that of international reference values of GHD/ISS patients.
Improved Plasmonic Hot-Electron Capture in Au Nanoparticle/Polymeric Carbon Nitride by Pt Single Atoms for Broad-Spectrum Photocatalytic H2 Evolution
Authors: Gao Manyi , Tian Fenyang , Zhang Xin , Chen Zhaoyu , Yang Weiwei , Yu Yongsheng
Published: May 2023

Rationally designing broad-spectrum photocatalysts to harvest whole visible-light region photons and enhance solar energy conversion is a “holy grail” for researchers, but is still a challenging issue. Herein, based on the common polymeric carbon nitride (PCN), a hybrid co-catalysts system comprising plasmonic Au nanoparticles (NPs) and atomically dispersed Pt single atoms (PtSAs) with different functions was constructed to address this challenge. For the dual co-catalysts decorated PCN (PtSAs–Au2.5/PCN), the PCN is photoexcited to generate electrons under UV and short-wavelength visible light, and the synergetic Au NPs and PtSAs not only accelerate charge separation and transfer though Schottky junctions and metal-support bond but also act as the co-catalysts for H2 evolution. Furthermore, the Au NPs absorb long-wavelength visible light owing to its localized surface plasmon resonance, and the adjacent PtSAs trap the plasmonic hot-electrons for H2 evolution via direct electron transfer effect. Consequently, the PtSAs–Au2.5/PCN exhibits excellent broad-spectrum photocatalytic H2 evolution activity with the H2 evolution rate of 8.8 mmol g−1 h−1 at 420 nm and 264 μmol g−1 h−1 at 550 nm, much higher than that of Au2.5/PCN and PtSAs–PCN, respectively. This work provides a new strategy to design broad-spectrum photocatalysts for energy conversion reaction.
Green Fabrication of Freestanding Piezoceramic Films for Energy Harvesting and Virus Detection
Authors: Liu Shiyuan , Liao Junchen , Huang Xin , Zhang Zhuomin , Wang Weijun , Wang Xuyang , Shan Yao , Li Pengyu , Hong Ying , Peng Zehua , Li Xuemu , Khoo Bee Luan , Ho Johnny C. , Yang Zhengbao
Published: May 2023

Most electronics such as sensors, actuators and energy harvesters need piezoceramic films to interconvert mechanical and electrical energy. Transferring the ceramic films from their growth substrates for assembling electronic devices commonly requires chemical or physical etching, which comes at the sacrifice of the substrate materials, film cracks, and environmental contamination. Here, we introduce a van der Waals stripping method to fabricate large-area and freestanding piezoceramic thin films in a simple, green, and cost-effective manner. The introduction of the quasi van der Waals epitaxial platinum layer enables the capillary force of water to drive the separation process of the film and substrate interface. The fabricated lead-free film, $${\text{Ba}}_{{{0}{\text{.85}}}} {\text{Ca}}_{{{0}{\text{.15}}}} {\text{Zr}}_{{{0}{\text{.1}}}} {\text{Ti}}_{{{0}{\text{.9}}}} {\text{O}}_{{3}}$$

Ba

0
.85

Ca

0
.15

Zr

0
.1

Ti

0
.9

O
3

(BCZT), shows a high piezoelectric coefficient d33 = 209 ± 10 pm V−1 and outstanding flexibility of maximum strain 2%. The freestanding feature enables a wide application scenario, including micro energy harvesting, and covid-19 spike protein detection. We further conduct a life cycle analysis and quantify the low energy consumption and low pollution of the water-based stripping film method.
Harvesting Environment Mechanical Energy by Direct Current Triboelectric Nanogenerators
Authors: Shan Chuncai , Li Kaixian , Cheng Yuntao , Hu Chenguo
Published: May 2023

As hundreds of millions of distributed devices appear in every corner of our lives for information collection and transmission in big data era, the biggest challenge is the energy supply for these devices and the signal transmission of sensors. Triboelectric nanogenerator (TENG) as a new energy technology meets the increasing demand of today's distributed energy supply due to its ability to convert the ambient mechanical energy into electric energy. Meanwhile, TENG can also be used as a sensing system. Direct current triboelectric nanogenerator (DC-TENG) can directly supply power to electronic devices without additional rectification. It has been one of the most important developments of TENG in recent years. Herein, we review recent progress in the novel structure designs, working mechanism and corresponding method to improve the output performance for DC-TENGs from the aspect of mechanical rectifier, tribovoltaic effect, phase control, mechanical delay switch and air-discharge. The basic theory of each mode, key merits and potential development are discussed in detail. At last, we provide a guideline for future challenges of DC-TENGs, and a strategy for improving the output performance for commercial applications.
Dynamic characteristics and energy evolution of granite subjected to coupled static–cyclic impact loading
Authors: Wang Xinyu , Liu Zhongyang , Gao Xicai , Li Pengfei , Dong Bin
Published: May 2023

In many underground rock projects, rock masses are subjected to coupled static–cyclic dynamic loading. In this paper, dynamic tests were carried out on granite specimens using a modified split Hopkinson pressure bar to study the dynamic characteristics and energy evolution of the rock under coupled static–cyclic impact loading. The results show that both the dynamic characteristics and the energy evolution of granite are sensitive to the number of repeated impacts and the confining pressure. Under the same confining pressure, the dynamic increase factor (DIF), dynamic elastic modulus, and transmitted energy ratio decreases, while the cumulative dissipated energy, cumulative specific energy dissipation and dissipated energy density tend to increase as more impact cycles are applied. The effect of confining pressure on enhancing the mechanical property of the rock is pronounced: the peak stress of rocks under confining pressure during cyclic impact is higher than their quasi-static compressive strength, and the DIF increase as the confining pressure increases. However, its effect on the dynamic elastic modulus is fairly insignificant. The confining pressure could change the crack propagation path of the specimens, and the failure mode is mainly a tensile failure, with no obvious axial splitting. By increasing the confining pressure, the energy dissipation capacity of the rock is significantly improved, and its increased rate of internal damage could be slowed down.

Graphical abstract
Meteorological Pre-warning Grade of High Temperature During Flowering Stage for Summer Maize in North China Plain
Authors: Li Shuyan , Fang Wensong , Liu Tianxue , Ma Zhihong , Noor Mehmood Ali , Liang Lu , Ma Wei , Xue Changying
Published: May 2023

High temperatures during flowering stage affects the seed setting in maize and thereby result in significant yield penalties in recent changing climate era. Based on the daily maximum temperature data of the maize growing season from 1971 to 2019 at the surface meteorological observatory in Henan Province of China and maize observation data at the agricultural meteorological observatory, an early warning grade of high temperatures during the summer maize flowering stage was constructed. The daily maximum temperature of the summer maize flowering stage was ≥ 32 °C as the critical threshold of high temperature disaster, and ≥ 35 °C as the threshold of high temperature disaster. The number of high temperature days (HD) ≥ 32 °C and ≥ 35 °C during 10 days of the summer maize flowering stage were counted. The sequence of high temperature days of summer maize flowering stage was constructed and its normal distribution characteristics were verified. The quartile value of the normal distribution sequence was selected as the threshold value of high temperature in different grades, and the high temperature heat damage in the summer maize flowering stage was divided into three early warning meteorological grades. The index verification of the early warning meteorological grade was carried out by using the observation data of kernel number per ear in the agricultural meteorological station for maize. The results showed that the three grade indexes corresponding to the number of high temperature days with daily maximum temperature ≥ 32 °C were: 3 ≤ HD < 5 (Grade I), 5 ≤ HD < 7 (Grade II), and HD ≥ 7 (Grade III) and the three grade indexes corresponding to high temperature days ≥ 35 °C were: 2 ≤ HD < 3 (Grade I), 3 ≤ HD < 5 (Grade II), HD ≥ 5 (Grade III). The constructed indexes were verified as follows, the number of high temperature days ≥ 32 °C at about 90% stations was significantly negatively correlated with the number of maize grains per ear, and 74% stations which the number of high temperature days ≥ 35 °C was significantly negatively correlated with the number of maize grains per ear. Applying this index to evaluate the high temperature risk in the flowering period, we can indicate that the high temperature risk had trend of increasing gradually from north to south. In conclusion, the constructed high temperature warning meteorological grade index during the flowering stage could accurately reflect the damage grade of maize during the flowering stage.
Effects of Mineral and Organic Fertilization on Forage Maize Yield, Soil Carbon Balance, and NPK Budgets, Under Rainfed Conditions in the Azores Islands (Portugal)
Authors: Pacheco Carlos Arruda , Oliveira André , Tomaz Alexandra
Published: May 2023

Green organic fertilizers can be a valuable option to reduce the use of chemical fertilizers, improve the physical and chemical properties of soil, and promote circular agriculture. The effects of two fertilization schemes, (i) a combination of mineral fertilizers with dairy farm slurry (TA) and (ii) an organic substrate (SO) from green waste (TB), on soil fertility and forage maize (Zea mays L.) yield were studied in an on-farm trial in the Azores Island of S. Miguel (Portugal). For this purpose, soil chemical parameters were evaluated on three sampling dates, forage maize yield and yield components were compared, and the balances of soil carbon (SC), nitrogen (N), phosphorus (P), and potassium (K) were evaluated. The results showed that the maize yield obtained in TB was significantly higher than in TA. The differences in precipitation that occurred over the two years influenced the yield in both treatments. The SC, available P, and pH were significantly higher in TB at every sampling date, mainly in the subsurface layer, and overall enrichment in nitrogen was observed. Despite the need to extend this evaluation over a longer period, the results indicate that the application of SO could be an alternative to conventional mineral fertilization in forage maize in the Azores and in similar cropping systems in regions of temperate insular nature.
3D printable electroconductive gelatin-hyaluronic acid materials containing polypyrrole nanoparticles for electroactive tissue engineering
Authors: Serafin Aleksandra , Culebras Mario , Oliveira J. Miguel , Koffler Jacob , Collins Maurice N.
Published: May 2023

Electrically conductive bio-scaffolds are explored in the field of tissue engineering (TE) as a solution to address the clinical need of electroactive tissues, finding applications in nervous, cardiac, and spinal cord injury repair. In this work, we synthesise polypyrrole nanoparticles (PPy NP) via the mini-emulsion method with further combination with a gelatin/hyaluronic acid (HA) hydrogel to create electroconductive Gel:HA:PPy-NP TE scaffolds. Electroconductive Gel:HA:PPy-NP scaffolds possess excellent mechanical properties at 1.08 ± 0.26 MPa, closely matching the reported mechanical performance of the spinal cord. Scaffolds were designed with controlled porosity of 526.2 ± 74.6–403.9 ± 57.4 µm, and conductivities of 4.3 × 10–6 ± 1.1 × 10–6 S.cm−1 were reached. Rheological studies show that prior to lyophilisation, the Gel:HA:PPy-NP hydrogels display a shear-thinning behaviour. These gels were subsequently 3D printed into predefined 2 layer lattice geometries and displayed excellent post-printing shape fidelity. In vitro studies show that the Gel:HA:PPy-NP scaffolds are cytocompatible with mesenchymal stem cells and neuronal stem cells and display encouraging cell attachment and proliferation profiles. Based on these results, the incorporation of PPy NPs into Gel:HA biomaterial scaffolds enhances the conductive capabilities of the material, while showcasing biocompatible behaviour with cell cultures. Hence, Gel:HA:PPy-NP scaffolds are a promising TE option for stimulating regeneration following nervous tissue injury.
Hysteresis performance of section steel reinforced concrete-filled rectangular stainless steel tubular columns
Authors: Xie Enpu , Wang Yang , Bao Yibei , Huang Kun , Zhang Xianjiang
Published: May 2023

Due to high bearing capacity and excellent seismic performance, the section steel reinforced concrete-filled rectangular steel tube has been widely applied in engineering. The application of stainless steel for outer steel tube can improve the durability performance of members. In this study, ABAQUS software was used to perform nonlinear seismic analysis on section steel reinforced concrete-filled rectangular stainless steel tubular columns, and the numerical model was validated against experimental data. The mechanism and parametric study of the hysteresis performance were conducted. These parameters mainly include: concrete strength, strength of stainless steel, strength of section steel, steel ratio of stainless steel tube, steel ratio of section steel, axial compression ratio, and slenderness ratio. The analysis results showed that: increasing the strength of stainless steel tube and concrete can significantly improve the bearing capacity of members, but the strength of section steel has little effect; the bearing capacity decreases with the increasing slenderness ratio; when the axial compression ratio is smaller than 0.4, increasing axial compression can improve the bearing capacity. The strength of each material shows little influence on the shape of load–displacement skeleton; the axial compression ratio presents high effect on the shape of descending stage of curve, and the larger the axial compression ratio, the steeper the descending stage; the slenderness shows high influence on curve shape, and the larger the slenderness, the less the elastic stiffness, and the more gentle the descending stage of curve. Finally, a simplified load–displacement hysteretic model was proposed, which exhibits good agreement with finite element numerical analysis.
Boosting Adversarial Training Using Robust Selective Data Augmentation
Authors: Rasheed Bader , Masood Khattak Asad , Khan Adil , Protasov Stanislav , Ahmad Muhammad
Published: May 2023

Artificial neural networks are currently applied in a wide variety of fields, and they are near to achieving performance similar to humans in many tasks. Nevertheless, they are vulnerable to adversarial attacks in the form of a small intentionally designed perturbation, which could lead to misclassifications, making these models unusable, especially in applications where security is critical. The best defense against these attacks, so far, is adversarial training (AT), which improves the model’s robustness by augmenting the training data with adversarial examples. In this work, we show that the performance of AT can be further improved by employing the neighborhood of each adversarial example in the latent space to make additional targeted augmentations to the training data. More specifically, we propose a robust selective data augmentation (RSDA) approach to enhance the performance of AT. RSDA complements AT by inspecting the quality of the data from a robustness perspective and performing data transformation operations on specific neighboring samples of each adversarial sample in the latent space. We evaluate RSDA on MNIST and CIFAR-10 datasets with multiple adversarial attacks. Our experiments show that RSDA gives significantly better results than just AT on both adversarial and clean samples.
Sub-signature Operators and the Kastler-Kalau-Walze Type Theorem for Five Dimensional Manifolds with Boundary
Authors: Li Hongfeng , Wu Tong
Published: May 2023

In this paper, we prove the Kastler-Kalau-Walze type theorems for the sub-signature operators on 5-dimensional manifolds with boundary.
A Survey of Ski Patrols in the United States Comparing Medical Direction, Patroller Training, and Patient Care
Authors: Fell Lindsey L. , Linney Olivia S. , DeLoughery Thomas G. , Johnston Emily E.
Published: May 2023

Introduction

Ski patrols are tasked with substantial challenges: distance from definitive care, complex extrications, and winter environments. Rules for US ski patrols stipulate that ≥1 persons be trained in basic first aid, but no further regulations regarding the specifics of provided medical care exist. This project investigated patroller training, patient care, and medical direction of US ski patrols through a survey of ski patrol directors and medical directors.

Methods

Participants were contacted via email, phone, and personal contacts. After consultation with known ski patrol directors and medical directors for question guidance, 2 separate institutional review board-approved surveys were designed: 1 for ski patrol directors and 1 for ski patrol medical directors, containing 28 and 15 qualitative questions, respectively. The surveys were distributed with a link to the encrypted Qualtrics survey platform. After 2 reminders and 4 mo, results were downloaded from Qualtrics into an Excel spreadsheet.

Results

Twenty-two responses from patrol directors and 15 from medical directors were received. The response rate is unknown. Outdoor emergency care certification was the minimum medical training required by 77% of the study participants. Twenty-seven percent of surveyed patrols belonged to an emergency medical service agency. Fifty percent of 11 surveyed ski patrols had a medical director, 6 of whom were board certified in emergency medicine. All surveyed medical directors stated that they assisted with patroller education, and 93% assisted with protocol development.

Conclusions

The surveys demonstrated variability in patroller training, protocols, and medical directorship. The authors questioned whether ski patrols would benefit from increased standardization of care and training, quality improvement programs, and medical directorship.
The Constructicon
Authors: Diessel Holger
Published: May 2023

It is one of the central claims of construction grammar that constructions are organized in some kind of network, commonly referred to as the constructicon. In the classical model of construction grammar, developed by Berkeley linguists in the 1990s, the constructicon is an inheritance network of taxonomically related grammatical patterns. However, recent research in usage-based linguistics has expanded the classical inheritance model into a multidimensional network approach in which constructions are interrelated by multiple types of associations. The multidimensional network approach challenges longstanding assumptions of linguistic research and calls for a reorganization of the constructivist approach. This Element describes how the conception of the constructicon has changed in recent years and elaborates on some central claims of the multidimensional network approach.
The State and Capitalism in China
Authors: Pearson Margaret M. , Rithmire Meg , Tsai Kellee
Published: May 2023

China's contemporary political economy features an emboldened role for the state as owner and regulator, and with markets expected to act in the service of party-state goals. How has the relationship between the state and different types of firms evolved? This Element situates China's reform-era political economy in comparative analytic perspective with attention to adaptations of its model over time. Just as other types of economies have generated internal dynamics and external reactions that undermine initial arrangements, so too has China's political economy. While China's state has always played a core role in development, over time prioritization of growth has shifted to a variant of state capitalism best described as, “party-state capitalism,” which emphasizes risk management and leadership by the Chinese Communist Party (CCP). Rather than reflecting long-held intentions of the CCP, the transition to party-state capitalism emerged from reactions to perceived threats and problems, some domestic and some external. These adaptations are refracted in the contemporary crises of global capitalism.This title is also available as open access on Cambridge Core.
Fine Structure of Tremor Migrations Beneath the Kii Peninsula, Southwest Japan, Extracted With a Space‐Time Hough Transform
Authors: Sagae Kodai , Nakahara Hisashi , Nishimura Takeshi , Imanishi Kazutoshi
Published: May 2023

Tectonic tremors occurring on subducting plate boundaries are known to migrate at various timescales and migration speeds. Spatiotemporal patterns of tremor migration are key to investigating the rupture growth of slow earthquakes. However, spatiotemporal patterns are not sufficiently simple to visually define tremor migrations. This study developed a space‐time Hough transform to objectively extract tremor migrations. The space‐time Hough transform enables the extraction of multiple tremor migrations with various durations, migration directions, and migration speeds. We applied this method to a catalog of tremors for the period from 2012 to 2014, which was determined from the data analysis of a dense seismic array deployed in the Kii Peninsula, Southwest Japan. We successfully extracted 1,010 tremor migrations with durations ranging from 10 min to 24 hr. Along‐strike migrations propagating southwestward were predominant in the northeastern part of the Kii Peninsula, whereas those propagating northeastward were principal in the southwestern part. Regarding the along‐dip direction, tremor migrations propagating in the up‐dip directions were predominant in the deep part, and those propagating in the down‐dip directions were principal in the shallow part. The patterns of along‐strike migrations were related to the distribution of tremor energies, suggesting that tremor migrations may be controlled by heterogeneous structures of frictional properties on the plate interface. We further found that the migration speed is proportional to the inverse of the square root of the duration. This relation implies that a diffusion process controls the growth of fault ruptures behind tremor migrations.
Inter‐Annual Variability in Phytoplankton and Nutrients in the Gulf of Elat/Aqaba
Authors: Berman Hadar , Gildor Hezi , Fredj Erick
Published: May 2023

The Gulf of Elat/Aqaba exhibits high inter‐annual variability in mixed layer depth. Observations from the northern Gulf show differences of hundreds of meters in winter mixing depth, which ranges between 300 m in years with shallow mixing and up to 700 m in years with deep mixing. Deep mixing events can occur in two consecutive years or after four consecutive years of shallow mixing. The mixing depth has an effect on the concentration of nutrients and chlorophyll (and other tracers) in the surface and deep water. Using a 3D coupled physical‐ecological model, we studied the effect of shallow versus deep mixing on the processes controlling the phytoplankton bloom and on nutrient accumulation in the deep water. We found that years with deep mixing are characterized by larger spatial variability in surface and integrated chlorophyll concentration during the mixing season. We found that horizontal advection is a dominant contributor for integrated phytoplankton concentration in years with deep mixing in the northern Gulf. Even when mixing was deep and nutrient limitation decreased, light limitation on phytoplankton integrated growth was enhanced in the north compared with the south. In addition, we showed that the nutrient accumulation in the deep water after a year with deep mixing in the northern Gulf was initially affected mostly by physical processes (such as advection and vertical mixing), and less from ecological regeneration, and switched to be dominated by ecological processes alone during the third year after mixing.
Friction Experiments on Lunar Analog Gouges and Implications for the Mechanism of the Apollo 17 Long Runout Landslide
Authors: Magnarini G. , Aretusini S. , Mitchell T. M. , Pennacchioni G. , Di Toro G. , Schmitt H. H.
Published: May 2023

The Light Mantle landslide is a hypermobile landslide on the Moon. Apollo 17 astronauts collected a core sample of the top 60 cm of the Light Mantle deposit, which is currently being analyzed as part of the NASA's Apollo Next Generation Sample Analysis program. The origin of its hypermobility remains undetermined, as the proposed mechanisms are difficult to prove because of the lack of theoretical and experimental support and the scarcity of field data related to the internal structures of its deposit. Regardless of the emplacement mechanisms, it has been proposed that localized dynamic frictional weakening is responsible for the early stage instability that leads to catastrophic failure. Here, we conduct friction experiments under vacuum to investigate the viability of dynamic friction weakening in lunar analog anorthosite‐bearing gouges (i.e., rock powders). Our results show that localized dynamic friction weakening does not occur in these gouges at loading conditions where, instead, weakening is observed in other materials on Earth. Therefore, possibly other fluidization‐related mechanisms contributed to the initiation of the hypermobile Light Mantle landslide. Finally, we describe the microstructures formed in the experiments, including the presence of clast cortex aggregates. Preliminary investigation of the Light Mantle core samples (73001/73002) shows the presence of similar microstructures. Therefore, our microstructural observations will help the analysis and interpretation of the Apollo 17 core samples, as keys to insights about internal processes occurring during the emplacement of the landslide.
Temporal and Spatial Variations in Subterranean Estuary Geochemical Gradients and Nutrient Cycling Rates: Impacts on Groundwater Nutrient Export to Estuaries
Authors: Wilson Stephanie J. , Anderson Iris C. , Song Bongkeun , Tobias Craig R.
Published: May 2023

Subterranean estuaries (STEs) form at the land‐sea boundary where groundwater and seawater mix. These biogeochemically reactive zones influence groundwater‐borne nutrient concentrations and speciation prior to export via submarine groundwater discharge (SGD). We examined a STE located along the York River Estuary (YRE) to determine if SGD delivers dissolved inorganic nitrogen (DIN) and phosphorus (DIP) to the overlying water. We assessed variations in STE geochemical profiles with depth across locations, times, and tidal stages, estimated N removal along the STE flow path, measured hydraulic gradients to estimate SGD, and calculated potential nutrient fluxes. Salinity, dissolved oxygen (DO), DIN, and DIP varied significantly with depth and season (p < 0.05), but not location or tidal stage. Ammonium dominated the DIN pool deep in the STE. Moving toward the sediment surface, ammonium concentrations decreased as nitrate and DO concentrations increased, suggesting nitrification. Potential sediment N removal rates mediated by denitrification were <8 mmoles N m−2 d−1. The total groundwater discharge rate was 38 ± 11 L m−2 d−1; discharge followed tidal and seasonal patterns. Net SGD nutrient fluxes were 0.065–3.2 and 0.019–0.093 mmoles m−2 d−1 for DIN and DIP, respectively. However, microbial N removal in the STE may attenuate 0.58% to >100% of groundwater DIN. SGD fluxes were on the same order of magnitude as diffusive benthic fluxes but accounted for <10% of the nutrients delivered by fluvial advection in the YRE. Our results indicate the importance of STE biogeochemical transformations to SGD flux estimations and their role in coastal eutrophication and nutrient dynamics.
Acceleration of the Parameterization of Unified Microphysics Across Scales (PUMAS) on the Graphics Processing Unit (GPU) With Directive‐Based Methods
Authors: Sun Jian , Dennis John M. , Mickelson Sheri A. , Vanderwende Brian , Gettelman Andrew , Thayer‐Calder Katherine
Published: May 2023

Cloud microphysics is one of the most time‐consuming components in a climate model. In this study, we port the cloud microphysics parameterization in the Community Atmosphere Model (CAM), known as Parameterization of Unified Microphysics Across Scales (PUMAS), from CPU to GPU to seek a computational speedup. The directive‐based methods (OpenACC and OpenMP target offload) are determined as the best fit specifically for our development practices, which enable a single version of source code to run either on the CPU or GPU, and yield a better portability and maintainability. Their performance is first examined in a PUMAS stand‐alone kernel and the directive‐based methods can outperform a CPU node as long as there is enough computational burden on the GPU. A consistent behavior is observed when we run PUMAS on the GPU in a practical CAM simulation. A 3.6× speedup of the PUMAS execution time, including data movement between CPU and GPU, is achieved at a coarse horizontal resolution (8 NVIDIA V100 GPUs against 36 Intel Skylake CPU cores). This speedup further increases up to 5.4× at a high resolution (24 NVIDIA V100 GPUs against 108 Intel Skylake CPU cores), which highlights the fact that GPU favors larger problem size. This study demonstrates that using GPU in a CAM simulation can save noticeable computational costs even with a small portion of code being GPU‐enabled. Therefore, we are encouraged to port more parameterizations to GPU to take advantage of its computational benefit.
Modeling the Production of Heinrich Layers With a Sediment‐Enabled Iceberg Model
Authors: Fendrock Michaela , Condron Alan , McGee David
Published: May 2023

In the North Atlantic, relatively coarse grained sediments can be found periodically throughout sediment cores spanning the Last Glacial Period. These sediments were rafted by icebergs released from the Laurentide Ice Sheet (LIS) in so‐called Heinrich Events. These “Heinrich Layers” coincide with records of global climate change, suggesting that the impact of these events was propagated beyond the North Atlantic. In order to best understand the climate context and significance of Heinrich Events, it is important to constrain the mechanism for their release from the LIS and the nature of the ice sheet itself. One approach for investigating the source of Heinrich Events is to understand the sediment load of icebergs involved, information that would inform interpretations of how those icebergs were produced. By simulating Heinrich Events in a high resolution global climate model (20–40 times the resolution of previous studies), this work investigates the processes involved in the deposition of Heinrich Layers in the North Atlantic. In these simulations, the same volume of sediment is distributed differently through the same volume of icebergs, producing profoundly different sediment records. Due to the high resolution of the model, these simulated sedimentary layers can be inspected in great detail, revealing nuances of the deposit. Only when sediment is distributed throughout the entire iceberg does the model produce a sediment pattern in agreement with observations, yet icebergs with this sediment distribution are not observed in the modern‐day.
Miniaturized High Gain Broadband 16‐Element MIMO Array Using Planar Artificial Magnetic Conductor With Enhanced Isolation for WLAN/WiMAX Applications
Authors: Malekpoor Hossein , Hamidkhani Mehdi
Published: May 2023

A low‐profile 16‐element printed dipole antenna (PDA) array backed by a planar artificial magnetic conductor (AMC) is introduced for multiple‐input multiple‐output (MIMO) wireless communications. The proposed 16‐element MIMO array loaded by a 13 × 13 AMC reflector with various polarized directions exhibits a low‐profile wideband structure, which includes the broad measured bandwidths from 4.25 to 7.25 GHz with increased gains (>8 dBi) and high efficiency. The high isolation between the 16 elements with diverse polarizations is larger than 27 dB and reaches 67 dB over the operating band for MIMO systems. The suggested PDA with a microstrip V‐shaped dipole excited by a V‐shaped microstrip feedline is used to expand the broad simulated band spanning 5.34–6.70 GHz (S11 ≤ −10 dB). Moreover, the suggested 13 × 13 planar fractal AMC reflector is loaded into the PDA array to exhibit a reflection coefficient, S11, of less than −10 dB across the band of 4.26–6.90 GHz for wireless local area network and worldwide interoperability for microwave access applications. The proposed design with AMC compared to the design without AMC exhibits a size reduction of 50.3%, increased gain up to 8.2 dBi, and excellent impedance matching with unidirectional radiation patterns. The novel AMC unit cell is realized based on the planar patch with inserted slots to operate at 6.10 GHz with an AMC band spanning 5.15–7.10 GHz (32%).
The Art of Scientific Curation
Authors: Bugbee Kaylin , Smith Deborah , Wingo Stephanie , Foshee Emily
Published: May 2023

Scientific content curation provides users across diverse disciplines and levels of experience with a valuable means of accessing relevant and reliable information amid the growing data landscape.
Bayesian Monte Carlo Inversion of InSAR Time Series Deformation Induced by Wastewater Injection: A Case Study in West Texas
Authors: Zheng Weiyu , Lu Zhong , Kim Jin‐Woo
Published: May 2023

Wastewater disposal can induce detectable surface uplift, which may cause ground instability and threaten infrastructure. The distributions of local hydro‐geomechanical parameters, especially Young's modulus and hydraulic conductivity, play an essential role in these geohazards. To constrain these parameters, we have inverted spatio‐temporal deformation measured by Interferometric Synthetic Aperture Radar (InSAR) and injection information using a Bayesian Monte Carlo approach with a poroelastic finite element model. Sentinel‐1A/B imagery from 2014 to 2020 is processed to track the spatio‐temporal deformation in Winkler county, West Texas, USA. The posterior distribution of subsurface effective volumes reveals under‐reported volumes in the well near the deformation center. In addition, the inversion results provide better constraints for the parameters than those solely obtained based on the cumulative spatial deformation or temporal development of the deformation center.
Poynting Fluxes, Field‐Aligned Current Densities, and the Efficiency of the Io‐Jupiter Electrodynamic Interaction
Authors: Sulaiman A. H. , Szalay J. R. , Clark G. , Allegrini F. , Bagenal F. , Brennan M. J. , Connerney J. E. P. , Hue V. , Kurth W. S. , Lysak R. L. , Nichols J. D. , Saur J. , Bolton S. J.
Published: May 2023

Juno's highly inclined orbits provide opportunities to sample high‐latitude magnetic field lines connected to the orbit of Io, among the other Galilean satellites. Its payload offers both remote‐sensing and in‐situ measurements of the Io‐Jupiter interaction. These are at discrete points along Io's footprint tail and at least one event (12th perijove) was confirmed to be on a flux tube Alfvénically connected to Io, allowing for an investigation of how the interaction evolves down‐tail. Here we present Alfvén Poynting fluxes and field‐aligned current densities along field lines connected to Io and its orbit. We explore their dependence as a function of down‐tail distance and show the expected decay as seen in UV brightness and electron energy fluxes. We show that the Alfvén Poynting and electron energy fluxes are highly correlated and related by an efficiency that is fully consistent with acceleration from Alfvén wave filamentation via a turbulent cascade process.
Ballooning of Surface‐Advected Freshwater Bulge in a Rotating Frame
Authors: Liu Zhiqiang , Gan Jianping , Cai Zhongya
Published: May 2023

This research delves into the intrinsic dynamics of an anticyclonic circulation that involves a ballooning bulge generated by a generalized river plume over an idealized shelf topography. The circulation features a strong jet‐stream overshooting the estuary mouth, curving toward the coast, and a returning flow along the shoreside edge. Our study focuses on the ballooning process, which involves the jet‐stream’s expansion and the freshwaters’ downstream movement. We demonstrate that the negative curvature vorticity, generated by flow inertia, sustains this process by amplifying the jet‐stream through anticyclonic gradient wind balance. Our research presents new insights into the origin of the negative curvature vorticity associated with the anticyclonic bending of the jet‐stream. The negative curvature vorticity regulates the ration between streamline’s and trajectory's radius, promoting the freshwaters’ escape from the jet‐stream and facilitating the bulge’s ballooning. The negative shear vorticity over the downshelf coast near the estuary mouth is the source of the curvature vorticity. The banking and curvature‐acceleration processes, which stand for the cross‐stream variation of the downstream component of the pressure force and the turning of the jet‐stream, respectively, trade‐off this shear vorticity to form the negative curvature vorticity.
In Recognition of Our 2022 Peer Reviewers and Volunteers
Authors: Montési Laurent G. J. , Määttänen Anni , Rogers A. Deanne , Thomson Bradley J.
Published: May 2023

Peer review is the key to ensuring that the articles published in scientific journals such as JGR: Planets are based on sound scientific principles, follow state‐of‐the‐art techniques, and present exciting discoveries or novel understanding of the fundamental processes that affect solar system objects. JGR: Planets covers an extraordinarily broad range of topics addressing every aspect of geoscience with the only requirement that the work addresses planetary processes. The breadth of topics published is reflected by our editorial team composed in 2022 of associate editors Jun Cui, Joel Davis, Leigh Fletcher, Matthias Grott, Ananya Mallik, German Martínez, Molly McCanta, Katarina Miljkovic, Ryan Park, Andrew Poppe, Beatrix Sánchez‐Cano, Mariek Schmidt, Yasuhito Sekine, Kelsi Singer, Sonia Tikoo, David Trang, and Zhiyong Xiao in addition to the editors who authored this note. We rely on the expertise of the community to vet the articles submitted to the journal. In 2022, JGR: Planets benefited from 1,299 reviews provided by 775 unique volunteer reviewers. We also received help from 29 guest editors working on seven active special collections. We know that all our volunteers juggle many duties, both professional and personal. We are forever grateful that they chose to dedicate their time and energy to evaluating submitted manuscripts and advising us on the suitability of each manuscript for our journal, often suggesting ways to improve the paper. Scientific publishing is truly a selfless community effort. The entire editorial board of JGR: Planets wishes to express their most heartfelt gratitude to the many scientists who chose to support their journal. Thank you!
Intra‐Seasonal Variability in Sediment Provenance and Transport Processes in the Brahmaputra Basin
Authors: Dixit Abhishek , von Eynatten Hilmar , Schönig Jan , Karius Volker , Mahanta Chandan , Dutta Subashisa
Published: May 2023

Sediment composition in modern fluvial settings is commonly assessed regarding spatial but rarely temporal variability, potentially leading to a bias of unknown extent. Here, we present the grain‐size distribution, bulk chemical and mineralogical composition of a time‐series set of 36 suspended sediment samples from the Brahmaputra river, as well as clay and heavy mineral analysis of selected samples. Sampling covers the June–November 2021 period, which included two major flooding events. We show that the two flooding events are characterized by contrasting grain size, with the first event characterized by a grain‐size minimum and the second by a grain‐size maximum. Although grain sizes of the first flood and the period after the second are similar, their compositions differ significantly, highlighted by a factor‐two decrease of biotite largely compensated by an increase in quartz. By contrast, the content of garnet, clinopyroxene, sillimanite, and rutile increased compared to epidote and amphibole during the second flood event. By relating the results to spatio‐temporal rainfall and discharge patterns and basin morphology, we conclude that the first flooding primarily mobilized hydraulically pre‐sorted sediments from the exposed sandbars of the floodplains, while those sandbars are already submerged during the second flooding in a single‐channel system, resulting in higher sediment contributions from highland tributaries draining igneous and high‐grade metamorphic rocks. Such temporal variations pose constraints on the interpretation of compositional differences between individual samples regarding sediment provenance and dispersal and should be considered in studies of modern drainage basins as well as ancient sediment routing systems.
Spatial Patterns of Disconnectivity Explain Catchment‐Scale Sediment Dynamics and Transfer Efficiencies
Authors: Turley Mike , Hassan Marwan A.
Published: May 2023

While connectivity studies are becoming common in the Earth sciences, disconnectivity has received much less attention. Sediment storage is the direct result of sediment disconnectivity and can provide concrete evidence of the spatial patterns of disconnectivity at the catchment‐scale. In this study, we explore the catchment‐scale sediment dynamics of the Tahoma Creek watershed, a high‐gradient glacio‐volcanic landscape, within a sediment budget framework and identify and map sources of disconnectivity to determine whether they explain the spatial patterns and estimated efficiencies of sediment transfers. We found that up to 80% of the total eroded sediment is sourced from the proglacial zone. The proglacial zone is characterized by high connectivity resulting from frequent debris flows and floods, and rapidly responds to changing conditions. Down valley, however, sources of disconnectivity become increasingly more prevalent, the hillslopes become decoupled from the channel, and a majority of the eroded sediment is redeposited with as little as ∼15% reaching the outlet. The spatial distribution of sources of disconnectivity and their upslope affected areas explains, to a large degree, catchment‐scale sediment dynamics and sediment transfer efficiencies and is in close agreement with quantitative connectivity estimates. We find that steep, glaciated watersheds are predominantly disconnected over human timescales and suggest that disconnectivity is the dominant state of landscapes over most timescales of interest. Mapping sources of disconnectivity provides a straightforward and concrete approach to estimating system disconnectivity and can increase confidence when paired with quantitative indices.