bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of edge serration on the performance of stone-tip projectiles: an experimental case study of the Maros Point from Holocene South Sulawesi
Authors: Ferdianto Anton , Suryatman  , Fakhri  , Hakim Budianto , Sutikna Thomas , Lin Sam C. 
Published: July 2022

AbstractSerrated stone points have been documented in a variety of archaeological settings worldwide. In Indonesia, serrated points known as Maros point began to appear during the mid-Holocene as part of the Toalean techno-complex in southern South Sulawesi. Researchers have speculated functional and cultural reason behind the emergence of these distinctive artefact as projectile points, an assumption that has yet to be verified by archaeological data. In particular, the edge serration has been suggested to allow for deeper penetration and/or act as barbs to prevent the easy withdrawal of the points from the target. In this study, we experimentally test these functional hypotheses regarding the effect of edge serration on stone arrowheads resembling Maros points when fired using different bow draw weights. We also investigate variation in breakage and impact fracture pattern between serrated and non-serrated points. Our result show that, compared to the non-serrated points, the serrated arrows not only deliver deeper penetrations, but also require less force to withdraw from the ballistic gel target. However, these relationships are complicated by the inclusion of skin and bone in the ballistic target. The findings demonstrate that the effect of serrated stone points on projectile performance depends on factors such as the projectile delivery system and prey type. Moreover, under identical firing settings, the serrated points develop more variable macrofracture patterns than the non-serrated points, likely owing the irregular edge morphologies. Taking these results together, we discuss the implications of our experimental study on the appearance of Maros points and the Toalean techno-complex in South Sulawesi during the mid-Holocene.
Understanding metaphorical understanding (literally)
Authors: Stuart Michael T. , Wilkenfeld Daniel 
Published: July 2022

AbstractMetaphors are found all throughout science: in published papers, working hypotheses, policy documents, lecture slides, grant proposals, and press releases. They serve different functions, but perhaps most striking is the way they enable understanding, of a theory, phenomenon, or idea. In this paper, we leverage recent advances on the nature of metaphor and the nature of understanding to explore how they accomplish this feat. We attempt to shift the focus away from the epistemic value of the content of metaphors, to the epistemic value of the metaphor’s consequences. Many famous scientific metaphors are epistemically good, not primarily because of what they say about the world, but because of how they cause us to think. Specifically, metaphors increase understanding either by improving our sets of representations (by making them more minimal or more accurate), or by making it easier for us to encode and process data about complex subjects by changing how we are disposed to conceptualize those subjects. This view hints towards new positions concerning testimonial understanding, factivity, abilities, discovery via metaphor, and the relation between metaphors and models.
The impact of overbalance pressure on the alteration of sandstone geomechanical properties
Authors: Gamal Hany , Elkatatny Salaheldin 
Published: July 2022

AbstractThe overbalance pressure drilling technique is well common and practiced during the drilling operations in the petroleum field. This parameter is very critical and affects the drilled formation characteristics, and therefore, the main objective of the current study is to evaluate the impact of overbalance pressure that is applied during the drilling operation on the rock elastic and strength characteristics by employing integrated lab experimental work. Berea Buff sandstone rock type was utilized to interact with water-based drilling fluid (barite-weighted) under an extended range of overbalance pressure [300 to 1000 psi]. The current research presents extensive lab analyses that cover filtration tests for rock-mud interaction, scratch testing for determining the rock strength profile, sonic data acquisition, elastic properties determination, and spectrometry of scanning electron microscope and nuclear magnetic resonance spectrometry to study the internal pore structure changes. The analysis was performed before the mud interaction for the saturated samples (base case) and after applying different overbalance pressure (pre-mud interaction) to evaluate the rock properties alterations. The obtained results showed the high degree of impact of the overbalance pressure on the sonic wave propagation as the compressional and shear wave velocities increased by 17 and 6%, respectively with increasing the overbalance pressure. Poisson’s ratio showed a stable trend, while Young’s modulus showed an increasing trend by 23% increase with the extended range of the overbalance pressure. The rock strength showed deterioration behavior with increasing the overbalance pressure. The unconfined compression strength decreased by 10% and the tensile strength showed a 9% reduction. The internal pore spectrometry showed the rock structure alterations due to mud solids precipitations and filtrate fluid impact on the rock integrity during the rock-mud interaction. In addition, statistical analysis illustrated the high degree of relationship between the recorded rock characteristics with the overbalance pressure as a controlling factor on the rock and mud interaction.
XFEM modeling of the effect of in-situ stresses on hydraulic fracture characteristics and comparison with KGD and PKN models
Authors: Esfandiari Morteza , Pak Ali 
Published: July 2022

AbstractIncreasing the permeability of hydrocarbon reservoirs by creating artificial cracks that are induced by injection of fluids under high pressure is called hydraulic fracturing (HF). This method is widely used in petroleum reservoir engineering. For design of Hydraulic Fracture operations, several analytical models have been developed. KGD and PKN are the first and most used analytical models in this area. Although number of advanced softwares are developed in recent years, KGD and PKN models are still popular and have even been used in a number of softwares. In both models the characteristics of the fracture namely: fracture length (L), fracture width (w), and fluid pressure at the crack mouth (p) are determined based on closed form relations using the reservoir rock shear stiffness, Poisson’s ratio, fluid injection rate, and injection time. Despite their ease of use, KGD and PKN models do not consider some important geo-mechanical and hydro-mechanical parameters and this shortcoming makes their results to be approximate. The aim of this study is evaluating the effects of in-situ stress on the fracture length, width, and fluid pressure employing XFEM method. In this study, tensile fracture mode and cohesive zone model are used for creation and propagation of cracks. In this paper, by conducting a series of numerical simulations using XFEM and after verification of the results, the accuracy of the analytical formulas of KGD and PKN models are examined. The results show that due to some simplifying assumptions used in KGD and PKN analytical models and neglecting some hydraulic and geomechanical parameters such as in-situ stresses, the length, width, and fluid pressure of the crack obtained from analytical formulas differ from the results of the numerical simulations. In this paper, the effects of in-situ stresses on hydraulic fracture characteristics (width, length, and crack mouth fluid pressure) are investigated and presented in the form of a number of correction (modification) factors that can be used for improvement of the results of KGD and PKN models. The findings of this study can help for more accurate design of hydraulic fracture process in oil industry for increasing the production of hydrocarbon reservoirs.
Ultralight and hyperelastic SiC nanofiber aerogel spring for personal thermal energy regulation
Authors: Song Limeng , Fan Bingbing , Chen Yongqiang , Gao Qiancheng , Li Zhe , Wang Hailong , Zhang Xinyue , Guan Li , Li Hongxia , Zhang Rui 
Published: July 2022

AbstractMultifunctionalization is the development direction of personal thermal energy regulation equipment in the future. However, it is still a huge challenge to effectively integrate multiple functionalities into one material. In this study, a simple thermochemical process was used to prepare a multifunctional SiC nanofiber aerogel spring (SiC NFAS), which exhibited ultralow density (9 mg/cm3), ultralow thermal conductivity (0.029 W/(m·K) at 20 °C), excellent ablation and oxidation resistance, and a stable three-dimensional (3D) structure that composed of a large number of interlacing 3C-SiC nanofibers with diameters of 300–500 nm and lengths in tens to hundreds of microns. Furthermore, the as-prepared SiC NFAS displayed excellent mechanical properties, with a permanent deformation of only 1.3% at 20 °C after 1000 cycles. Remarkably, the SiC NFAS exhibited robust hyperelasticity and cyclic fatigue resistance at both low (∼−196 °C) and high (∼700 °C) temperatures. Due to its exceptional thermal insulation performance, the SiC NFAS can be used for personal thermal energy regulation. The results of the study conclusively show that the SiC NFAS is a multifunctional material and has potential insulation applications in both low- and high-temperature environments.
Zur Rolle von Unterhaltungsmagazinen in der Pandemie. Zwischen entdifferenzierten Sammelsurien und differenzierten Wissensvermittlern
Authors: Lickhardt Maren 
Published: July 2022

ZusammenfassungDieser Artikel untersucht, wie illustrierte Unterhaltungsmagazine Covid-19 in zwei Zeiträumen thematisieren: von Februar bis Juli 2020 und von Oktober bis Dezember 2021. Die Zeitschriften stellen nicht nur eine Kontaktszene zwischen Wissenschaft und Öffentlichkeit dar, sondern vermitteln auch zwischen verschiedenen professionellen Diskursen, die die Pandemie bearbeiten, und müssen selektieren, welchen Bearbeitungsmodus sie präferieren. Während sich die Zeitschriften, weil sie sich ohnehin im permanenten Krisenmodus befinden, zunächst insofern kaum von der Pandemie irritieren lassen, als sie diese im boulevardesken Modus bearbeiten, indem sie etwa die Reaktion von Prominenten zeigen, die ihrerseits Laien sind, stellen sie in der zweiten Untersuchungsphase auf seriöse Vermittlung von Wissenschaft um und tragen zur Popularisierung von medizinischem und epidemiologischem Wissen bei.
Antioxidant Machinery and Glyoxalase System Regulation Confers Salt Stress Tolerance to Wheat (Triticum aestivum L.) Plants Treated with Melatonin and Salicylic Acid
Authors: Talaat Neveen B. , Todorova Dessislava 
Published: July 2022

Abstract
Plant growth regulators melatonin (MT) and salicylic acid (SA) have potent roles in plant salt tolerance. However, only a few reports have studied the influence of their combined treatment on plant salt tolerance. The current study, as a first investigation, was aimed to evaluate the effect of MT and SA combined treatment on the antioxidant and glyoxalase defense machineries of salt-stressed wheat plants. In the present study, the potential role of 70 μM MT and/or 75 mg l−1 SA on mitigating salt injury (6.0 and 12.0 dS m−1 salinity levels) was investigated in wheat (Triticum aestivum L. cv. Sids 14). Exogenously applied MT and/or SA improved the activity of ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, glutathione reductase, glutathione peroxidase, and glutathione S-transferase, which effectively scavenged reactive oxygen species (ROS) in stressed plants. Excessive accumulation of the toxic methylglyoxal was reversed via the up-regulation of the glyoxalase system (glyoxalase I and glyoxalase II) and the ascorbate–glutathione cycle. Foliar applications also reduced membrane damage by lowering lipid peroxidation and protein oxidation due to effective ROS detoxification by antioxidants such as ascorbate, glutathione, phenols, and flavonoids. Moreover, exogenous MT and/or SA applications increased endogenous MT and SA levels under both non-saline and saline conditions. The combined treatment of MT and SA yielded the best results. Overall, this combined treatment regulated the antioxidant machinery and glyoxalase system, suggesting a role for it in salt stress mitigation. Therefore, it can be considered as an effective method for reducing salt toxicity in sustainable agricultural systems.
Chaotic Wind Driven Optimization with Fitness Distance Balance Strategy
Authors: Tang Zhentao , Tao Sichen , Wang Kaiyu , Lu Bo , Todo Yuki , Gao Shangce 
Published: July 2022

AbstractWind driven optimization (WDO) is a meta-heuristic algorithm based on swarm intelligence. The original selection method makes it easy to converge prematurely and trap in local optima. Maintaining population diversity can solve this problem well. Therefore, we introduce a new fitness-distance balance-based selection strategy to replace the original selection method, and add chaotic local search with selecting chaotic map based on memory to further improve the search performance of the algorithm. A chaotic wind driven optimization with fitness-distance balance strategy is proposed, called CFDBWDO. In the experimental section, we find the optimal parameter settings for the proposed algorithm. To verify the effect of the algorithm, we conduct comparative experiments on the CEC 2017 benchmark functions. The experimental results denote that the proposed algorithm has superior performance. Compared with WDO, CFDBWDO can gradually converge in function optimization. We further verify the practicality of the proposed algorithm with six real-world optimization problems, and the obtained results are all better than other algorithms.
Level of Fear in Front-Line Nurses During the COVID-19 Pandemic, a Cross-Sectional Study in Iran
Authors: Moradi Maryam , Sharififar Simintaj 
Published: July 2022

Abstract

Introduction:
The front-line nurses are at risk of physical and psychological damage during an epidemic. This study aimed to investigate the level of nurses’ fear in coronavirus disease 2019 (COVID-19) central hospitals in Iran.

Methods:
The study is cross-sectional. The questionnaire was designed in 2 parts (demographic and the level of fear). The sampling method was quota and random. The questionnaires were completed by the same nurses after 4 weeks.

Results:
A total of 345 questionnaires were distributed (the response rate was 89.27%). A total of 121 nurses (39.3%) were female. Most participants were in the 26-30 y group. paired t-test showed the mean fear of COVID-19 in the first and the fourth weeks was significant (P < 0.001). There was a statistical relationship between demographic variables of gender, age, marriage, number of working shifts, having children, and work experience of nurses with the level of fear.

Conclusions:
Health-care providers have shown resilience and a spirit of professional sacrifice to overcome problems. The nurses experienced a level of disease-related fear in close contact with COVID-19 patients. It is essential to apply strategies to optimize safe working conditions and minimize psychological harm and provide regular and intensive training to all health-care providers to improve preparedness.
Notes on a Perilous Journey to the United States: Irregular Migration, Trafficking in Persons, and Organized Crime
Authors: Correa-Cabrera Guadalupe , Schaefer Kathleen Blair 
Published: July 2022

ABSTRACTThis article examines the interplay between transnational criminal actors (essentially human smugglers), local crime groups, and drug cartels in the phenomenon of trafficking in persons coming from Central America along Mexico’s eastern migration routes. The analysis focuses on sex trafficking, compelled labor for criminal activities, and other forms of labor trafficking. Through qualitative research that involved 336 semistructured interviews with migrants, activists, and other persons familiar with the subject, this work describes and maps trafficking trends throughout Mexico’s eastern migration routes. It also sheds light on the role of drug cartels and other crime groups (local and transnational) in these activities.
Interactions, relationships and belonging: comparing social connectedness and perceived isolation among older women living alone in private homes and in assisted living
Authors: Berlin Melissa , Perone Angela K. 
Published: July 2022

AbstractAge-related changes shape social connectedness, isolation and loneliness among older adults. Ageing often accompanies decisions about ageing in place or moving (i.e. senior living facility). Scant research compares these two living arrangements and even sparser research focuses on older women. This study, thus, poses the following questions: How do older women (aged 75+ years) experience social connectedness and perceived isolation? How does this experience vary between older women living alone in private homes and those living in assisted living facilities? Data include semi-structured interviews with women aged 75+ years who live alone in a private home or in an assisted living facility (N = 16). Findings revealed differences in three aspects of social connectedness: interactions, relationships and belonging. Private home participants' interactions underscored intentionality, with minimal investment in forging new or deeper relationships and an emphasis on belonging to the world through awareness, contribution and cognitive ability. The experiences of participants living in assisted living were characterised by availability of interactions and casual relationships. They emphasised belonging to the facility community, while positioning themselves between the status of resident and staff. Surprisingly, most participants in both groups did not express feelings of perceived isolation. Both had adapted their social connectedness expectations to reflect their current situation.
Temporary Leaders and Stable Institutions: How Local Bureaucratic Entrepreneurs Institutionalize China's Low-Carbon Policy Experiments
Authors: Gong Weila 
Published: July 2022

AbstractTraditional analysis of China's policy experimentation has focused on the role of central–local relations and rotating leaders in shaping the local agenda-setting process. Less is known about the role of less mobile mid-level local bureaucrats who serve as bridges in the implementation process. This paper examines why some cities have performed better than others at implementing and maintaining low-carbon policy experiments. Drawing on a comparison of four case cities and over 100 expert interviews, I argue that the availability of bureaucratic entrepreneurs and their resource mobilization capacity determine the level of local engagement in climate policy experimentation. This study shows that the institutionalization of local policy experiments is not only driven by the central government or rotating top local leaders but also by bureaucratic entrepreneurs who help policy experiments survive periodic changes in the bureaucracy. The findings have important implications for the fulfilment of China's 2060 carbon neutrality pledge.
Contribution of Non‐Water Ices to Salinity and Electrical Conductivity in Ocean Worlds
Authors: Castillo‐Rogez J. C. , Daswani M. M. , Glein C. R. , Vance S. D. , Cochrane C. J. 
Published: July 2022

AbstractModeling of the electrical conductivity (EC) of icy moon oceans has previously assumed that chloride, sulfate, and other ions released from rock leaching are the main solutes and carriers of EC. Here, we show that accreted volatiles, such as carbon dioxide and ammonia, can add a significant fraction of solutes in bodies whose volatile content was in part supplied from cometary materials. These volatiles can increase the EC of aqueous solutions above 1 S/m. Our salinity and EC estimates can serve as a basis for planning future magnetometer investigations at icy moons and dwarf planets. In particular, oceans expected in some of the Uranian satellites and Neptune's satellite Triton could have EC above 3 S/m as a result of accretion of both carbon dioxide and ammonia, even if rock leaching during water‐rock separation was limited, and if chlorine and sulfur abundances may be at CI carbonaceous chondritic levels.
New Estimates of Southern Ocean Annual Net Community Production Revealed by BGC‐Argo Floats
Authors: Su Jiaoyang , Schallenberg Christina , Rohr Tyler , Strutton Peter G. , Phillips Helen E. 
Published: July 2022

AbstractUsing an expanding Southern Ocean fleet of biogeochemical Argo (BGC‐Argo) floats, we developed a novel approach to estimate annual net community production (ANCP) by integrating subsurface oxygen drawdown from all available BGC‐Argo oxygen profiles. Our results suggest that, on average, 14% of remineralization occurs between 500 and 1,000 m and 15% occurs between the euphotic depth and 100 m. Using the improved methodology, we estimated total basin‐integrated ANCP in the Southern Ocean to be 3.89 GT C year−1 suggesting a more important role for the Southern Ocean in regulating oceanic carbon storage, atmospheric CO2 exchange and climate than previously assumed.
River Plume Modulation by Infragravity Wave Forcing
Authors: Flores Raúl P. , Williams Megan E. , Horner‐Devine Alexander R. 
Published: July 2022

AbstractWe present measurements at the mouth of Río Maipo, a small river that discharges into an energetic surfzone on the coast of Chile, which document for the first time the plume response to infragravity (IG) wave forcing. We find that inlet dynamics are strongly modulated by IG waves; inlet discharge velocity varies by 20% in the IG band relative to peak ebb velocity. Drone imaging and measurements of surfzone salinity show that the plume edge is forced offshore and onshore, modifying plume width by 20%–50% at IG frequencies. We conclude that the observed modulation results from surfzone forcing at IG frequencies consistent with a moving break point; increased (decreased) wave amplitude generates stronger (weaker) wave‐driven circulation and forces the plume onshore (offshore). Although river water is often trapped in the surfzone, these dynamics may enhance mixing and cross‐shore dispersion of river‐borne materials.
Insights Into the Aerodynamic Versus Radiometric Surface Temperature Debate in Thermal‐Based Evaporation Modeling
Authors: Mallick Kaniska , Baldocchi Dennis , Jarvis Andrew , Hu Tian , Trebs Ivonne , Sulis Mauro , Bhattarai Nishan , Bossung Christian , Eid Yomna , Cleverly Jamie , Beringer Jason , Woodgate William , Silberstein Richard , Hinko‐Najera Nina , Meyer Wayne S. , Ghent Darren , Szantoi Zoltan , Boulet Gilles , Kustas William P. 
Published: July 2022

AbstractGlobal evaporation monitoring from Earth observation thermal infrared satellite missions is historically challenged due to the unavailability of any direct measurements of aerodynamic temperature. State‐of‐the‐art one‐source evaporation models use remotely sensed radiometric surface temperature as a substitute for the aerodynamic temperature and apply empirical corrections to accommodate for their inequality. This introduces substantial uncertainty in operational drought mapping over complex landscapes. By employing a non‐parametric model, we show that evaporation can be directly retrieved from thermal satellite data without the need of any empirical correction. Independent evaluation of evaporation in a broad spectrum of biome and aridity yielded statistically significant results when compared with eddy covariance observations. While our simplified model provides a new perspective to advance spatio‐temporal evaporation mapping from any thermal remote sensing mission, the direct retrieval of aerodynamic temperature also generates the highly required insight on the critical role of biophysical interactions in global evaporation research.