bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correlation analysis of feedstock flowability and temperature for laser-based powder bed fusion of polymers
Authors: Steffen Raphael Timothy , Tucker Michael Robert , Sillani Francesco , Schütz Denis , Bambach Markus 
Published: August 2024

Purpose
For additive manufacturing (AM) through laser-based powder bed fusion of polymers (PBF-LB/P), accurate characterization of powder flowability is vital for achieving high-quality parts. However, accurately characterizing feedstock flowability presents challenges because of a lack of consensus on which tests to perform and the diverse forces and mechanisms involved. This study aims to undertake a thorough investigation into the flowability of eight feedstock materials for PBF-LB/P at different temperatures using various techniques.

Design/methodology/approach
For ambient temperature assessments, established metrics such as avalanche angle and Hausner ratio, along with the approximated flow function coefficient (FFCapp), are used. The study then focuses on the influence of elevated temperatures representative of in-process conditions. FFCapp and differential scanning calorimetry (DSC) are performed and analyzed, followed by a correlation analysis as a holistic approach to identify key aspects for flowability. Furthermore, two feedstock materials are compared with a previous study to connect the present findings to PBF-LB/P processing.

Findings
The study revealed intrinsic material properties such as mechanical softening near the melting point to become significant. This partially explains why certain powders with poor ambient temperature flowability are consistently demonstrated to produce high-quality parts. FFCapp and thermal characterization through DSC are identified as critical metrics for optimizing feedstock material characteristics across temperature ranges.

Originality/value
Previous studies emphasized specific characterizations of feedstock material at ambient temperature, presented a limited materials selection or focused on metrics such as shape factors. In contrast, this study addresses a partially understood aspect by examining the critical role of temperature in governing feedstock material flowability. It advocates for the inclusion of temperature variables in flowability analyses to closely resemble the PBF-LB/P process, which can be applied to material design, selection and process optimization.
Challenges and opportunities in teaching and learning in AskALibrarian chat: differences across subject domains
Authors: Dempsey Paula R. , Insua Glenda M. , Armstrong Annie R. , Hudson Holly Joy , Caragher Kristyn , McGregor Mariah 
Published: August 2024

PurposeThis analysis of chat reference transcripts assesses differences in how librarians and graduate assistants (GAs) incorporate teaching strategies in responding to chat reference inquiries in social sciences, health sciences, humanities, STEM and business/economics at a large, public R1 university in the United States.Design/methodology/approachResearchers with disciplinary assignments in five different subject domains conducted qualitative analysis of a purposive sample of 982 transcripts of chat interactions during four semesters in 2021 and 2022.FindingsSome form of information literacy instruction (ILI) occurred in 58% of the transcripts, with slightly less teaching occurring in social sciences inquiries than in other subject areas. Of transcripts that included teaching strategies, search procedures predominated, followed by a mix of concepts and procedures, and the least with concepts only. Chat providers taught concepts specific to social sciences, health sciences and humanities, but not to STEM or business.Research limitations/implicationsThe study compares transcripts at one institution; findings may be most applicable to large, research institutions that seek to incorporate ILI in online reference services.Practical implicationsChat reference training should include best practices for ILI relevant to specific subject domains for providers without background in those disciplines and recommendations for referrals to subject specialists.Originality/valueExisting ILI literature does not address the question of how chat providers teach concepts rooted in a specific subject domain or offer a comparison of teaching strategies employed in different disciplines, by librarians versus GAs or staff.
A novel Au-NPs/DBTTA nanocomposite-based electrochemical sensor for the detection of ascorbic acid (AA)
Authors: Mecheri Nacira , Lefrada Leila , Benounis Messaoud , Ben Hassine Chedia , Berhoumi Houcine , Mabrouk Chama 
Published: August 2024

Purpose
Ascorbic acid, a water-soluble antioxidant, is an essential component of the human diet and is known for its potent antioxidant properties against several diseases. In recent years, there has been increasing interest in the development of nonenzymatic sensors due to their simplicity, efficiency and excellent selectivity. The aim of this study is to present a selective and sensitive method for the detection of ascorbic acid in aqueous system using a new electrochemical non-enzymatic sensor based on a gold nanoparticles Au-NPs-1,3-di(4-bromophényl)-5-tert-butyl-1,3,5-triazinane (DBTTA) composite.

Design/methodology/approach
Using the square wave voltammetry (SWV) technique, a series of Au-NPs-DBTTA composites were successfully developed and investigated. First, DBTTA was synthesized via the condensation of tert-butylamine and a4-bromoaniline. The structure obtained was identified by IR, 1H NMR and 13C NMR analysis. A glassy carbon electrode (GCE) was modified with 10–1 M DBTTA dissolved in an aqueous solution by cyclic voltammetry in the potential range of 1–1.4 V. Au-NPs were then deposited on the DBTTA/GCE by a chronoamperometric technique. SWV was used to study the electrochemical behavior of the modified electrode (DBTTA/Au-NPs/GCEs). To observe the effect of nanoparticles, ascorbic acid in a buffer solution was analyzed by SWV at the modified electrode with and without gold nanoparticles (Au-NPs).

Findings
The DBTTA/Au-NPs/GCE showed better electroanalytical results. The detection limit of 10–5 M was obtained and the electrode was proportional to the logarithm of the AA concentration in the range of 5 × 10−3 M to 1 × 10−1 with very good correlation parameters.

Originality/value
It was also found that the elaborated sensor exhibited reproducibility and excellent selectivity against interfering molecules such as uric acid, aspartic acid and glucose. The proposed sensor was tested for the recognition of AA in orange, and satisfactory results were obtained.
Female pumas exhibit behavioral plasticity through partitioning temporal activity at communication hubs based on life stage
Authors: Allen Maximilian L. , Green Austin M. , Avrin Alexandra C. , Wilmers Christopher C. 
Published: August 2024

AbstractIntraspecific communication among carnivores can be complex and risky, and many solitary carnivores (including pumas; Puma concolor) primarily communicate with potential mates and competitors indirectly via scent marking at communication hubs. We used multiple temporal analyses to understand if pumas of three classes (males, solo females, and females traveling with dependent kittens) varied in their temporal use of communication hubs to reduce risk while gathering information. We hypothesized that males would visit scrapes at typical times (nighttime), but that female behavioral strategies might vary based on whether they had dependent kittens or not. We found that pumas of different classes varied in their temporal patterns: male pumas concentrated their temporal activity at night (which is typical for pumas), solo females also tended to visit during the nighttime (although slightly earlier on average than males), while females with kittens were more active in the daytime. Our findings highlight the importance of communication hubs for intersexual communication in pumas and the flexibility that is inherent in puma behavioral ecology. Females adjusted their temporal behavior and visitation based on their reproductive status and life history stage, likely to assess dominant territorial males while also limiting their risk. Our study provides a mechanistic view of how communication through scent marking allows both long‐term and spatially separated communication to occur and that may allow pumas at different life stages with different risk tolerances to communicate with each other.
Understanding the oxidation of hemp seed oil and improving its stability by encapsulation into protein microcapsules
Authors: Kim Sanghoon , Hwang Hong‐Sik 
Published: August 2024

Hemp seed oil (HSO) is an edible oil low in saturated fat and rich in polyunsaturated fatty acids (PUFAs) such as omega‐6 and omega‐3 fatty acids. When they are in contact with oxygen in the air, PUFAs are easily oxidized even at room temperature due to the multiple double bonds that facilitate the formation of reactive radicals when exposed to air. This study aimed to evaluate the oxidation of HSO under different conditions and to examine the encapsulation of HSO with zein as a new method to prevent its oxidation. Peak time of weight gain monitored with thermogravimetric analysis and oxidation products detected with high‐performance liquid chromatography were used to determine the oxidation of fatty acids and HSO. It was found that the thermal decomposition of fatty acids prevailed over autoxidation beyond a certain temperature (at about 100–140°C). Encapsulating HSO into zein microcapsules, which isolates oil droplets from contact with oxygen in the air, effectively prevented its oxidation. The induction period of HSO oxidation was delayed by 7.3–9.3 times with the zein‐to‐HSO ratio of 0.5–1.25. In contrast, 0.5% (w/w) α‐tocopherol could prolong the induction period up to 2.5 times indicating that the encapsulation method was much more effective than α‐tocopherol in preventing the oxidation of HSO. This method may also be applied for other oils susceptible to oxidation such as omega‐3 oils.Practical ApplicationThis research compares the effects of three schemes that stabilize hemp seed oil from oxidation: (1) lowering temperature to slow down the oxidation reaction, (2) adding antioxidant to deactivate the initiation of oxidation reaction, and (3) encapsulating oil droplets into protein microcapsules to keep the oil from contact with oxygen. The experimental result showed the encapsulation of oils in protein microcapsules is more effective than the other two. The stabilization approaches applied to hemp seed oil can also be applied to other edible oils that are unstable.
Controlling the quality of Patinopecten yessoensis from the perspective of the ultrasound and ferulic acid influences
Authors: Liu Bing , Wu Yuan , Jiang Liang‐liang , Liang Qiu‐yan 
Published: August 2024

AbstractIn this study, the effects of ultrasound combined with ferulic acid (FA) on the quality of the Yesso scallop (Patinopecten yessoensis) adductor muscles (SAM) during refrigerated storage were investigated. The results demonstrated that the combined treatment with 350 W ultrasound and FA (UFA) significantly delayed enzyme activities and microbial growth in SAM tissues compared to FA treatment alone. After 6 days of cold storage, samples treated with UFA exhibited higher hardness (2850 g), lower thiobarbituric acid reactive substances (TBARS = 9.35 MDA mg/g SAM), and lower total volatile basic nitrogen (TVB‐N = 19.75 mg/100 g SAM) values compared to control and FA‐treated samples. Consequently, UFA treatment prolonged the shelf life of SAM by 3 days during storage at 4°C. Based on scanning electron microscopy and low‐field nuclear magnetic resonance data, these findings are attributed to UFA treatment not only reducing the degradation of SAM tissue network structure but also minimizing water loss.Practical ApplicationScallop adductor muscle (SAM) is commonly considered a delicacy owing to its unique mouthfeel and delicious taste. However, owing to its high moisture content and high levels of various nutrients, SAM has a short shelf life. In this work, a combination of ultrasound with ferulic acid (UFA) has been found to have effective preservation effects on SAM during refrigerated storage. Our study findings pave the way for a potential approach to maintain scallop quality during processing and storage. Moreover, our study also provides some theoretical basis for using and promoting these technologies in aquatic products.
Hearing loss, social isolation and depression in participants aged 50 years or over in Tasmania, Australia
Authors: Hamrah Mohammed Shoaib , Bartlett Larissa , Goldberg Lynette Ruth , Bindoff Aidan , Vickers James Clement 
Published: August 2024

AbstractObjectiveAcquired hearing loss (HL) in adult life is one of the most prevalent health conditions and is associated with several chronic diseases. Hearing loss can lead to reduced social activity and individuals' perceptions of supportiveness within social networks. This study explored the effects of corrected vs. uncorrected hearing loss on social support, social isolation, anxiety and depression.MethodsWe undertook a cross‐sectional study. An online survey was completed by 7442 Australian residents aged 50 years or older as part of the Island Study Linking Ageing and Neurodegenerative Disease (ISLAND). Respondents were grouped into those with no reported acquired HL, those with corrected HL (managed with hearing aids and other listening devices) and those with uncorrected HL.ResultsHearing loss was reported by 1274 participants (17%). Compared to male participants, there was a higher proportion of female participants in the No‐HL group (25% male, 75% female). Compared to participants with corrected or no‐HL, those with HL (n = 548, 7%) reported significantly smaller (p = .007) and less supportive social networks (p = .001), higher self‐reported anxiety (p < .001) and depression (p < .001) symptoms. Depression scores were significantly higher in those with HL‐corrected than No‐HL (SMD = .10, p = .04).ConclusionsUncorrected HL was associated with poor mental health and social isolation, compounding the risk of dementia. Correcting for HL appeared to mitigate these outcomes, except for depression. Longitudinal studies are needed to track the effects of HL correction over time. Hearing status needs to be assessed when people present with mental health concerns, so health professionals can make appropriate referrals and provide relevant advice and support.
Postoperative delirium increases follow‐up mortality following hip arthroplasty in older patients with femoral neck fracture
Authors: Wu Penghuan , Yang Ying , Yuan Aidong , Wang Yu , Zhang Yingze 
Published: August 2024

AbstractObjectiveThis study aimed to identify independent perioperative risk factors and follow‐up mortality associated with postoperative delirium in older patients undergoing hip arthroplasty at a large teaching hospital in South China. We aimed to establish a specialised model to predict the risk of postoperative delirium.MethodsThis retrospective observational study was conducted in the orthopaedics department of the hospital between January 2018 and December 2022. Participants were stratified into two groups: those with and those without postoperative delirium. The study included demographics, clinical characteristics, surgery‐related and laboratory specifics, as well as details on delirium.ResultsIn this study of 241 participants, the median age was 80 years (IQR, 74.5–85), with postoperative delirium observed in 43 individuals (18%). Multivariate logistic regression analysis identified age (OR, 1.07; 95% CI, 1.01–1.14; p = .03), arrhythmia (OR, 7.97; 95% CI, 2.25–28.29; p = .001), dementia (OR, 7.08; 95% CI, 1.73–28.95; p = .006) and a lower level of red blood cells (RBC) (OR, .33; 95% CI, .17–.64; p < .001) as independent factors associated with postoperative delirium after hip arthroplasty. Patients experiencing both preoperative and postoperative delirium had significantly higher follow‐up mortality compared to those with postoperative delirium only and those without delirium (80% vs. 38% vs. 24%, p = .02).ConclusionsThe specialised model was established to effectively predict delirium following hip arthroplasty in patients with femoral neck fracture. Postoperative delirium strongly associates with follow‐up mortality. Proactive management is crucial for minimising delirium occurrence after hip arthroplasty and improving patient outcomes.
External validation of and improvement upon a model for the prediction of placenta accreta spectrum severity using prospectively collected multicenter ultrasound data
Authors: Kolak Magdalena , Gerry Stephen , Huras Hubert , Al Naimi Ammar , Fox Karin A. , Braun Thorsten , Stefanovic Vedran , van Beekhuizen Heleen , Morel Olivier , Paping Alexander , Bertholdt Charline , Calda Pavel , Lastuvka Zdenek , Jaworowski Andrzej , Savukyne Egle , Collins Sally ,   IS‐PAS group
Published: August 2024

AbstractIntroductionThis study aimed to validate the Sargent risk stratification algorithm for the prediction of placenta accreta spectrum (PAS) severity using data collected from multiple centers and using the multicenter data to improve the model.Material and MethodsWe conducted a multicenter analysis using data collected for the IS‐PAS database. The Sargent model's effectiveness in distinguishing between abnormally adherent placenta (FIGO grade 1) and abnormally invasive placenta (FIGO grades 2 and 3) was evaluated. A new model was developed using multicenter data from the IS‐PAS database.ResultsThe database included 315 cases of suspected PAS, of which 226 had fully documented standardized ultrasound signs. The final diagnosis was normal placentation in 5, abnormally adherent placenta/FIGO grade 1 in 43, and abnormally invasive placenta/FIGO grades 2 and 3 in 178. The external validation of the Sargent model revealed moderate predictive accuracy in a multicenter setting (C‐index 0.68), compared to its higher accuracy in a single‐center context (C‐index 0.90). The newly developed model achieved a C‐index of 0.74.ConclusionsThe study underscores the difficulty in developing universally applicable PAS prediction models. While models like that of Sargent et al. show promise, their reproducibility varies across settings, likely due to the interpretation of the ultrasound signs. The findings support the need for updating the current ultrasound descriptors and for the development of any new predictive models to use data collected by different operators in multiple clinical settings.
Tackling adversity with open minds: Team personality composition facilitates shared leadership and team resilience
Authors: Mitchell Rebecca , von Stieglitz Shauna , Gu Jun , Boyle Brendan , Ocampo Anna Carmella G. 
Published: August 2024

AbstractResilient teams can efficiently resolve disruption and overcome adversity. Despite growing interest in building and maintaining resilient teams, our understanding of the factors that promote team resilience necessitates further theorizing and empirical testing. Based on conservation of resources and shared leadership theories, we propose that team member personality (i.e., mean openness to experience) serves as a resource that facilitates team resilience via shared leadership. Further, we argue that the strength of influence of shared leadership on team resilience is contingent on the variance of openness to experience scores among team members. We draw our conclusions from three studies (i.e., two recall experiments and a multi‐source field study) involving working professionals in virtual teams. Our findings shed light on the interactive role of team member personality in explaining team resilience, thereby extending our knowledge of the personality predictors of shared leadership and team resilience.
Analysis of the relationship between energy balance and properties of rumen fermentation of primiparous dairy cows during the perinatal period
Authors: Sawado Rie , Osawa Ryo , Sobajima Hideo , Hayashi Noboru , Nonaka Itoko , Terada Fuminori , Mitsumori Makoto 
Published: August 2024

AbstractShort‐chain fatty acids (SCFAs) produced in the rumen are key factors affecting dairy cows' energy balance (EB). This study aimed to quantitatively evaluate the effects of SCFAs production on EB in dairy cows. Primiparous dairy cows were divided into high non‐esterified fatty acid (NEFA; group H) and low NEFA (group L) groups based on their blood NEFA levels at week 3 postpartum, which served as an indicator of EB. The amounts of SCFAs produced in the rumen, including acetate, propionate, and butyrate (SCFAsP), were calculated using the predicted rumen volume. Because there were no differences between the groups in SCFAsP/dry matter intake, whereas 4% fat‐corrected milk (FCM)/SCFAsP was significantly higher in group H, it was suggested that more body fat was mobilized for milk production in group H. However, group L, which showed better EB, had propionate dominant and lower FCM/SCFAsP and milk energy/SCFAs energy at 3 and 7 weeks postpartum, indicating that group L had a better energy supply for milk production. These results suggest that SCFAsP produced by rumen fermentation and the composition of SCFAs in the rumen affect milk production and EB.
Analysis of longitudinal patterns and predictors of medicine use in residential aged care using group‐based trajectory modelling: The MEDTRAC‐Polypharmacy longitudinal cohort study
Authors: Wabe Nasir , Urwin Rachel , Seaman Karla , Timothy Andrea , Raban Magdalena Z. , Westbrook Johanna 
Published: August 2024

AbstractAimsPolypharmacy serves as a quality indicator in residential aged care facilities (RACFs) due to concerns about inappropriate medication use. However, aggregated polypharmacy rates at a single time offer limited value. Longitudinal analysis of polypharmacy patterns provides valuable insights into identifying potential overuse of medicines. We aimed to determine long‐term trajectories of polypharmacy (≥9 medicines) and factors associated with each polypharmacy trajectory group.MethodsThis was a longitudinal cohort study using electronic data from 30 RACFs in New South Wales, Australia. We conducted group‐based trajectory modelling to identify and characterize polypharmacy trajectories over 3 years. We evaluated the model fitness using the Bayesian Information Criterion, entropy (with a value of ≥0.8 considered ideal) and several other metrics.ResultsThe study included 2837 permanent residents (median age = 86 years, 61.7% female and 47.4% had dementia). We identified five polypharmacy trajectory groups: group 1 (no polypharmacy, 46.0%); group 2 (increasing polypharmacy, 9.4%); group 3 (decreasing polypharmacy, 9.2%); group 4 (increasing‐then decreasing polypharmacy, 10.0%), and group 5 (persistent polypharmacy, 25.4%). The model showed excellent performance (e.g., entropy = 0.9). Multinomial logistic regressions revealed the profile of each trajectory group (e.g., group 5 residents had higher odds of chronic respiratory disease compared with group 1).ConclusionsOur study identified five polypharmacy trajectory groups, including one with over a quarter of residents following a persistently high trajectory, signalling concerning medication overuse. Quality indicator programs should adopt tailored metrics to monitor diverse polypharmacy trajectory groups, moving beyond the current one‐size‐fits‐all approach and better capturing the evolving dynamics of residents' medication regimens.