bluuebunny/crossref_metadata_2025 huggingface dataset:
Inter-model agreement on projected shifts in California hydroclimate characteristics critical to water management
Authors: Persad Geeta G. , Swain Daniel L. , Kouba Claire , Ortiz-Partida J. Pablo
Published: October 2020

Shifts away from the historical hydroclimate in populated regions can have dire consequences for water management. Regions like the state of California—where highly engineered, geographically interconnected, and inflexible water management systems are predicated on particular spatiotemporal patterns of water availability—are particularly vulnerable to hydroclimate shifts. However, much of the analysis of hydroclimate sensitivity to anthropogenic climate change has focused on gross metrics like annual mean precipitation, which is highly uncertain at the regional scale. This perceived uncertainty has deterred adaptation investments and quantitative integration of climate projection data into regional water management. Here, we assess projected future shifts in the state of California in a range of hydroclimate metrics critical to water management, using data from 10 statistically downscaled global climate model and two emissions scenarios currently used by the state. We find substantial inter-model agreement under both emissions scenarios—and > 80% inter-model agreement under the more severe climate change scenario—across metrics that collectively point toward an increasingly volatile, temporally concentrated, and extreme precipitation future for the state. We show, via hydrologic and operations modeling, that accounting for shifts in these more nuanced metrics reduces the projected reliability and sustainability of current water management practices to a greater degree than would be inferred from changes in total annual precipitation alone. These results highlight both the viability and critical importance of incorporating climate change projections quantitatively into water management decisions in California and other regions vulnerable to hydroclimate shifts, and underscore the need to develop integrated climate-hydrologic-operations models and decision-making protocols capable of accounting for all projected hydroclimate shifts.
Intentional and Performative Persuasion: The Linguistic Basis for Criminalizing the (Direct and Indirect) Encouragement of Terrorism
Authors: Macdonald Stuart , Lorenzo-Dus Nuria
Published: October 2020

Article 5 of the Council of Europe Convention on the Prevention of Terrorism requires member states to criminalise ‘public provocation to commit a terrorist offence’. In the U.K., the realisation of this obligation is found in the ‘Encouragement of terrorism’ offence contained in section 1 of the Terrorism Act 2006. As well as fulfilling the U.K.’s treaty obligation, this offence was intended to stop the spread of violent extremist ideology. Although the compatibility of this offence with the right to freedom of expression enshrined in Article 10 of the European Convention on Human Rights has been queried, both the domestic courts and the European Court of Human Rights have held that it complies with Article 10’s demands. So, instead of taking Article 10 as its starting point, this article draws instead on work from the field of linguistics: namely, speech act theory (SAT). By using insights from SAT, and by examining some of the linguistic strategies that may be used to encourage acts of terrorism, the article seeks to advance the legal understanding of the concept of encouragement. In particular, the article draws out two features of encouragement that have important implications for the appropriate boundaries of the encouragement of terrorism offence -encouragement is intentional and it is performative - and argues that, as currently drafted, the offence does not reflect the nature of encouragement as an intentional activity. The article concludes by drawing out from its analysis a series of proposed amendments that together address the rights-based concerns about the offence whilst maintaining its effectiveness as a counterterrorism tool.
Understanding Stigmatisation: Results of a Qualitative Formative Study with Adolescents and Adults in DR Congo
Authors: Hartog Kim , Peters Ruth M. H. , Jordans Mark J. D.
Published: October 2020

While stigmatisation is universal, stigma research in low- and middle-income countries (LMIC) is limited. LMIC stigma research predominantly concerns health-related stigma, primarily regarding HIV/AIDS or mental illness from an adult perspective. While there are commonalities in stigmatisation, there are also contextual differences. The aim of this study in DR Congo (DRC), as a formative part in the development of a common stigma reduction intervention, was to gain insight into the commonalities and differences of stigma drivers (triggers of stigmatisation), facilitators (factors positively or negatively influencing stigmatisation), and manifestations (practices and experiences of stigmatisation) with regard to three populations: unmarried mothers, children formerly associated with armed forces and groups (CAAFAG), and an indigenous population. Group exercises, in which participants reacted to statements and substantiated their reactions, were held with the ‘general population’ (15 exercises, n = 70) and ‘populations experiencing stigma’ (10 exercises, n = 48). Data was transcribed and translated, and coded in Nvivo12. We conducted framework analysis. There were two drivers mentioned across the three populations: perceived danger was the most prominent driver, followed by perceived low value of the population experiencing stigma. There were five shared facilitators, with livelihood and personal benefit the most comparable across the populations. Connection to family or leaders received mixed reactions. If unmarried mothers and CAAFAG were perceived to have taken advice from the general population and changed their stereotyped behaviour this also featured as a facilitator. Stigma manifested itself for the three populations at family, community, leaders and services level, with participation restrictions, differential treatment, anticipated stigma and feelings of scapegoating. Stereotyping was common, with different stereotypes regarding the three populations. Although stigmatisation was persistent, positive interactions between the general population and populations experiencing stigma were shared as well. This study demonstrated utility of a health-related stigma and discrimination framework and a participatory exercise for understanding non-health related stigmatisation. Results are consistent with other studies regarding these populations in other contexts. This study identified commonalities between drivers, facilitators and manifestations—albeit with population-specific factors. Contextual information seems helpful in proposing strategy components for stigma reduction.
The leaky pipeline in research grant peer review and funding decisions: challenges and future directions
Authors: Sato Sayaka , Gygax Pascal Mark , Randall Julian , Schmid Mast Marianne
Published: October 2020

The growing literature on gender inequality in academia attests to the challenge that awaits female researchers during their academic careers. However, research has not yet conclusively resolved whether these biases persist during the peer review process of research grant funding and whether they impact respective funding decisions. Whereas many have argued for the existence of gender inequality in grant peer reviews and outcomes, others have demonstrated that gender equality is upheld during these processes. In the present paper, we illustrate how these opinions have come to such opposing conclusions and consider methodological and contextual factors that render these findings inconclusive. More specifically, we argue that a more comprehensive approach is needed to further the debate, encompassing individual and systemic biases as well as more global social barriers. We also argue that examining gender biases during the peer review process of research grant funding poses critical methodological challenges that deserve special attention. We conclude by providing directions for possible future research and more general considerations that may improve grant funding opportunities and career paths for female researchers.
Legal Imaginaries and the Anthropocene: ‘Of’ and ‘For’
Authors: Grear Anna
Published: October 2020

This reflection contrasts the dominant imaginary underlying ‘lawofthe Anthropocene’ with an imaginary reaching towards ‘law/sforthe Anthropocene’. It does so primarily by contrasting two imaginaries of human embodiment—law’s existing imaginary of quasi-disembodiment and an alternative imaginary of embodiment as co-woven with the lively incipiencies and tendencies of matter. It draws on ‘transcorporeality’ and ‘sympoiesis’ as inspiration for ‘sympoietic normativities’ as ways of co-living and co-organizing in the face of the catastrophic implications of the Anthropocene emergency.
GPU-accelerated image segmentation based on level sets and multiple texture features
Authors: Reska Daniel , Kretowski Marek
Published: October 2020

In this paper, we present a fast multi-stage image segmentation method that incorporates texture analysis into a level set-based active contour framework. This approach allows integrating multiple feature extraction methods and is not tied to any specific texture descriptors. Prior knowledge of the image patterns is also not required. The method starts with an initial feature extraction and selection, then performs a fast level set-based evolution process and ends with a final refinement stage that integrates a region-based model. The presented implementation employs a set of features based on Grey Level Co-occurrence Matrices, Gabor filters and structure tensors. The high performance of feature extraction and contour evolution stages is achieved with GPU acceleration. The method is validated on synthetic and natural images and confronted with results of the most similar among the accessible algorithms.
Over-indebted Households in Poland: Classification Tree Analysis
Authors: Wałęga Grzegorz , Wałęga Agnieszka
Published: October 2020

Increasing a personal debt burden implies greater financial vulnerability and threats for macroeconomic stability. It also generates a risk of the households over-indebtedness. The assessment of over-indebtedness is conducted with the use of various objective and subjective measures based on the micro-level data. The aim of the study is to investigate over-indebted households in Poland using a unique dataset obtained from the CATI survey. We discuss and compare the usefulness of various over-indebtedness measures across different socio-economic characteristics. Due to the differences in over-indebtedness across single measures, we perform a more complex assessment using a mix of indicators. As an alternative to other commonly criticised over-indebtedness measures, we apply the “below the poverty line” (BPL) measure. In order to obtain the profile of over-indebted households, we use classification and regression tree analysis as an alternative to logit or probit models. We find that DSTI (“debt service to income”) ratio underestimates the extent of over-indebtedness in vulnerable groups of households in comparison with the BPL. We highlight the necessity to use different measures depending on the adopted definition of over-indebtedness. A psychological burden of debts is particularly strong among older and poorly educated respondents. We also find that the age structure of over-indebted households in Poland differs from this structure in countries with a broader access to consumer credits. Our results can be used to enrich the methods of assessing the household over-indebtedness.
Urbanization alters the abundance and composition of predator communities and leads to aphid outbreaks on urban trees
Authors: Korányi Dávid , Szigeti Viktor , Mezőfi László , Kondorosy Előd , Markó Viktor
Published: October 2020

Urbanization can affect arthropod abundance in different ways. While species with narrow habitat range and low dispersal ability often respond negatively to urban environments, many habitat generalist species with good dispersal ability reach high densities in city centers. This filtering effect of urban habitats can strongly influence predator-prey-mutualist interactions and may therefore affect the abundance of predatory and phytophagous species both directly and indirectly. Here, we assessed the effect of urbanization on aphids, predatory arthropods, and ants on field maple (Acer campestre) trees in and around the city of Budapest, Hungary. We used the percentage of impervious surfaces within a 500 m radius of each site as an index of the degree of urbanization. We found that the abundance of aphids increased with increasing level of urbanization. However, abundance of predatory arthropods and occurrence of poorly dispersing species within the predator community were negatively related to urbanization, and we identified these two independent factors as significant predictors of aphid abundances. The abundance of ants decreased with urbanization, and contrary to our expectations, did not affect the abundance pattern of aphids. Our results suggest that urbanization, by altering the abundance and composition of predator communities, can disrupt biological control of aphid populations, and thus may contribute to the aphid outbreaks on urban trees.
Efficacy of Woodchip Biochar and Brown Coal Waste as Stable Sorbents for Abatement of Bioavailable Cadmium, Lead and Zinc in Soil
Authors: Amoah-Antwi C. , Kwiatkowska-Malina J. , Szara E. , Thornton S. , Fenton O. , Malina G.
Published: October 2020

Organic sorbents alter physicochemical soil properties and mitigate heavy metal (HM) bioavailability. However, some sorbents are labile and, therefore, introduce the risk of HM release into soil after mineralisation. Before field application, new stable organic sorbents such as woodchip biochar (BIO) and brown coal waste (BCW) need to be tested and compared with standard organic amendments like farmyard manure (FYM). An incubated pot experiment was conducted to investigate the efficacy of FYM, BIO and BCW (added to soil in pots at 5 and 10% w/w) to alter soil physicochemical properties and mitigate bioavailability of Cd, Pb and Zn spiked in treatments at different doses (in mg kg−1); 0 (not spiked), 1 (1 Cd, 70 Pb, 100 Zn) and 2 (3 Cd, 500 Pb, 700 Zn), and incubated for 9 weeks. At the end of the experiment, the EDTA-extractable HM fractions, pH, cation exchange capacity (CEC) and specific surface area (SSA, to check trends) were determined in all treated soils. Results showed that FYM, BCW and BIO generally improved all soil properties (except reduced pH from BCW and apparent SSA reduction from FYM) and accounted for respective maximum abatements of Cd (50.2, 69.9 and 25.5%), Pb (34.2, 64.3 and 17.4%) and Zn (14.9, 17.7 and 11.8%) bioavailability in soil. FYM and BCW were more effective at 10% w/w especially in the low contaminated soil, whereas the highest efficacy for BIO was at 5% w/w and in the high contaminated soil. The efficacies of sorption by the organic sorbents varied for different HMs and were in the orders: BCW > FYM > BIO for Cd, FYM > BCW > BIO for Pb and BIO > BCW > FYM for Zn. Soil pH and CEC were strongly correlated with HM bioavailability in all treatments and implied that immobilisation of HMs occurred via complex formation, ion exchange and pH-dependent specific adsorption. All three sorbents were beneficial as soil amendments, and in terms of HM mitigation, BCW had the highest efficacy, followed by FYM and then BIO. Considering the documented high soil stability of BCW and BIO, these results are promising for further trialling at field scale.
Study of pig manure digestate pre-treatment for subsequent valorisation by struvite
Authors: Corona Francisco , Hidalgo Dolores , Martín-Marroquín Jesús María , Meers Erik
Published: October 2020

This work evaluates the release of phosphorus contained in the digestate from the anaerobic digestion of pig manure, through an acidification process. The objective of this acidification is to increase the amount of phosphorus available in the digestate liquid fraction and, subsequently, recover this element by chemical precipitation in the form of struvite or calcium phosphate. Two digestate samples (one fresh and one old) were studied and treated by adding various amounts of sulphuric acid to the different digestate fractions (raw digestate, solid fraction and liquid fraction). For the raw digestate, phosphorus releases higher than 95% were obtained for pH 4.0. In the last part of the experiment, the influence of acid pre-treatment on the reaction yield of phosphorus precipitation, in the form of struvite or calcium phosphate, was determined. Improvements in reaction yield were obtained up to 15% for struvite and 80% for calcium phosphate, increasing also in 7.5 times the amount of phosphorus available in the digestate liquid fraction, for both cases.
Traumatic brain injury-induced cerebral microbleeds in the elderly
Authors: Toth Luca , Czigler Andras , Horvath Peter , Kornyei Balint , Szarka Nikolett , Schwarcz Attila , Ungvari Zoltan , Buki Andras , Toth Peter
Published: October 2020

Traumatic brain injury (TBI) was shown to lead to the development of cerebral microbleeds (CMBs), which are associated with long term cognitive decline and gait disturbances in patients. The elderly is one of the most vulnerable parts of the population to suffer TBI. Importantly, ageing is known to exacerbate microvascular fragility and to promote the formation of CMBs. In this overview, the effect of ageing is discussed on the development and characteristics of TBI-related CMBs, with special emphasis on CMBs associated with mild TBI. Four cases of TBI-related CMBs are described to illustrate the concept that ageing exacerbates the deleterious microvascular effects of TBI and that similar brain trauma may induce more CMBs in old patients than in young ones. Recommendations are made for future prospective studies to establish the mechanistic effects of ageing on the formation of CMBs after TBI, and to determine long-term consequences of CMBs on clinically relevant outcome measures including cognitive performance, gait and balance function.
The Zygote Argument Is Still Invalid: So What?
Authors: Mickelson Kristin M.
Published: October 2020

In “The Zygote Argument is Invalid: Now What?”, Kristin Mickelson argues that Alfred Mele’s original Zygote Argument is invalid: its two premises tell us merely that the truth of determinism is (perhaps spuriously) correlated with the absence of free human agents, but the argument nonetheless concludes with a specific explanation for that correlation, namely that deterministic laws (of the sort described by determinism) preclude—rule out, destroy, undermine, make impossible, rob us of—free will. In a recent essay, Gabriel De Marco grants that the original Zygote Argument is invalid for the reasons that Mickelson has identified, and claims that he has developed two new solutions to her invalidity objection. In this essay, I argue that both of his proposed solutions are nonstarters, the first fails as a “rescue” because it simply restates an extant solution in new jargon and the second fails because it consists in another invalid variant of the original Zygote Argument.
What is Criminal Rehabilitation?
Authors: Forsberg Lisa , Douglas Thomas
Published: October 2020

It is often said that the institutions of criminal justice ought or—perhaps more often—ought not to rehabilitate criminal offenders. But the term ‘criminal rehabilitation’ is often used without being explicitly defined, and in ways that are consistent with widely divergent conceptions. In this paper, we present a taxonomy that distinguishes, and explains the relationships between, different conceptions of criminal rehabilitation. Our taxonomy distinguishes conceptions of criminal rehabilitation on the basis of (i) the aims or ends of the putatively rehabilitative measure, and (ii) the means that may be used to achieve the intended end. We also explore some of the implications of each conception, some of the payoffs of a taxonomy of the kind we offer, and some areas for future work.
Management control packages in family businesses: a configurational approach
Authors: Einhorn Stefanie , Heinicke Xaver , Guenther Thomas W.
Published: October 2020

This study uses survey data from top managers to explore how operational (e.g., cost types and cost center accounting) and strategically oriented (e.g., strategic and business planning) management accounting (MA) practices, diagnostic and interactive use of performance measures, and cultural controls are combined (management control package) to achieve high firm performance in family businesses (FBs). In previous research, such management control (MC) packages have received limited attention even though they offer an opportunity to reveal more information on the adoption of MA practices, use of performance measures, and MCs in FBs than analyses of individual control mechanisms. We chose a qualitative comparative analysis (QCA) because this method allows for explicitly addressing the three major challenges of configurational theory: asymmetry, conjunctional causation, and equifinality. By applying QCA, our study identifies six equifinal MC packages (i.e., different configurations of MA practices, types of use, and cultural controls with similar associations with firm performance) and, thus, provides an exploratory approach to describe more complex MA and MC designs that are empirically observable. By further analyzing these MC packages with additional information on the intensity of competition, the intensity of attention focusing, the interpretation of information by top management, and the organizational culture, this study extends the existing literature on FBs. The key finding of our analysis is that, regardless of their business environment, successful FBs place a very strong emphasis on cultural controls and/or have a high degree of interactive use of performance measures to steer their business.
Effect of increased serum 25(OH)D and calcium on structure and function of post-menopausal women: a pilot study
Authors: Hillstrom H. J. , Soeters R. , Miranda M. , Backus S. I. , Hafer J. , Gibbons M. , Thaqi I. , Lenhoff M. , Hannan M. T. , Endo Y. , Sculco T. , Lane J.
Published: October 2020

The purpose was to determine if increasing serum 25(OH)D and calcium in postmenopausal women increased skeletal muscle size, strength, balance, and functional task performance while decreasing muscle fatigue. PCSA of the vastus lateralis increased and ascent of stairs time decreased after 6 months of increased serum 25(OH)D.

Purpose

The Institute of Medicine recommends ≥ 20 ng/ml of serum 25-hydroxyvitamin D [25(OH)D] for bone and overall health. Serum 25(OH)D levels have been associated with physical performance, postural sway, and falls. The purpose of this study was to determine if increasing postmenopausal women’s serum 25(OH)D levels from 20–30 ng/ml to 40–50 ng/ml improved skeletal muscle size, strength, balance, and functional performance while decreasing skeletal muscle fatigue.

Methods

Twenty-six post-menopausal women (60–85 years old) with baseline serum 25(OH)D levels between 20 and 30 ng/ml were recruited. Oral over-the-counter (OTC) vitamin D3 and calcium citrate were prescribed to increase subjects’ serum 25(OH)D to levels between 40 and 50 ng/ml, serum calcium levels above 9.2 mg/dl, and PTH levels below 60 pg/ml, which were confirmed at 6 and 12 weeks. Outcome measures assessed at baseline and 6 months included muscle physiological cross-sectional area (PCSA), muscle strength, postural balance, time to perform functional tasks, and muscle fatigue. Repeated measures comparisons between baseline and follow-up were performed.

Results

Nineteen subjects completed the study. One individual could not afford the time commitment for the repeated measures. Three individuals did not take their vitamin D as recommended. Two subjects were lost to follow-up (lack of interest), and one did not achieve targeted serum 25(OH)D. Vastus lateralis PCSA increased (p = 0.007) and ascent of stair time decreased (p = 0.042) after 6 months of increasing serum 25(OH)D levels from 20–30 ng/ml to 40–50 ng/ml. Isometric strength was unchanged. Anterior-posterior center of pressure (COP) excursion and COP path length decreased (p < 0.1) albeit non-significantly, suggesting balance may improve from increased serum 25(OH)D and calcium citrate levels.

Conclusions

Several measures of muscle structure and function were sensitive to elevated serum 25(OH)D and calcium levels indicating that further investigation of this phenomenon in post-menopausal women is warranted.
Effect of Tempering on the Bainitic Microstructure Evolution Correlated with the Hardness in a Low-Alloy Medium-Carbon Steel
Authors: Ståhlkrantz Adam , Hedström Peter , Sarius Niklas , Sundberg Hans-Åke , Kahl Sören , Thuvander Mattias , Borgenstam Annika
Published: October 2020

A low-alloy medium-carbon bainitic steel was isothermally tempered at 300 °C for up to 24 hours which led to a significant hardness decrease. In order to explain the decreasing hardness, extensive microstructural characterization using scanning and transmission electron microscopy, X-ray diffraction, and atom probe tomography was conducted. The experimental work was further supplemented by thermodynamic and kinetic simulations. It is found that the main underlying reason for the hardness reduction during tempering is related to dislocation annihilation, possibly also with corresponding changes in Cottrell atmospheres. On the other hand, cementite precipitate size, effective grain size of the bainite, and retained austenite fraction appear unchanged over the whole tempering cycle.
Evaluation of the Neurogenic Potential in the Rat Inferior Colliculus from Early Postnatal Days Until Adulthood
Authors: Engert Jonas , Rak Kristen , Bieniussa Linda , Scholl Miriam , Hagen Rudolf , Voelker Johannes
Published: October 2020

Neural stem cells (NSCs) have been recently identified in the inferior colliculus (IC). These cells are of particular interest, as no casual therapeutic options for impaired neural structures exist. This research project aims to evaluate the neurogenic potential in the rat IC from early postnatal days until adulthood. The IC of rats from postnatal day 6 up to 48 was examined by neurosphere assays and histological sections. In free-floating IC cell cultures, neurospheres formed from animals from early postnatal to adulthood. The amount of generated neurospheres decreased in older ages and increased with the number of cell line passages. Cells in the neurospheres and the histological sections stained positively with NSC markers (Doublecortin, Sox-2, Musashi-1, Nestin, and Atoh1). Dissociated single cells from the neurospheres differentiated and were stained positively for the neural lineage markers β-III-tubulin, glial fibrillary acidic protein, and myelin basic protein. In addition, NSC markers (Doublecortin, Sox-2, CDK5R1, and Ascl-1) were investigated by qRT-PCR. In conclusion, a neurogenic potential in the rat IC was detected and evaluated from early postnatal days until adulthood. The identification of NSCs in the rat IC and their age-specific characteristics contribute to a better understanding of the development and the plasticity of the auditory pathway and might be activated for therapeutic use.
Social Networks and Workers’ Earnings in Contemporary China
Authors: Wu Qiong , Wallace Michael
Published: October 2020

Guanxi is the central form of social capital in Chinese society that provides access to resources, assets, and benefits that facilitate social status and social mobility. Substantial empirical research has documented the importance of guanxi networks in accessing resources for getting good jobs, moving up to better jobs, and achieving higher wages. Chinese Lunar New Year is a special occasion of cultural and social significance to cultivate and maintain guanxi networks. We thus conceptualize guanxi networks as the visiting networks during the Chinese New Year celebration. Using the 2008 Chinese General Social Survey, we construct five measures of the Chinese New Year greeting networks and assess their impact on workers’ earnings as well as gender differences in their effects on earnings. We also consider two major structural constraints—the hukou and social class—that affect the extent of one’s social networks and earnings. Our findings not only confirm the overall positive effects of the Chinese New Year greeting networks on earnings but also offer nuances that enhance the understanding of how guanxi networks as a manifestation of social capital embedded in Chinese traditional culture work in the contemporary era and intensify gender gaps.
Integrated optimisation for production capacity, raw material ordering and production planning under time and quantity uncertainties based on two case studies
Authors: Xu Wei , Song Dong-Ping
Published: October 2020

This paper develops a supply chain (SC) model by integrating raw material ordering and production planning, and production capacity decisions based upon two case studies in manufacturing firms. Multiple types of uncertainties are considered; including: time-related uncertainty (that exists in lead-time and delay) and quantity-related uncertainty (that exists in information and material flows). The SC model consists of several sub-models, which are first formulated mathematically. Simulation (simulation-based stochastic approximation) and genetic algorithm tools are then developed to evaluate several non-parameterised strategies and optimise two parameterised strategies. Experiments are conducted to contrast these strategies, quantify their relative performance, and illustrate the value of information and the impact of uncertainties. These case studies provide useful insights into understanding to what degree the integrated planning model including production capacity decisions could benefit economically in different scenarios, which types of data should be shared, and how these data could be utilised to achieve a better SC system. This study provides insights for small and middle-sized firm management to make better decisions regarding production capacity issues with respect to external uncertainty and/or disruptions; e.g. trade wars and pandemics.
Influence of the Addition of Spruce Fibers to Industrial-Type High-Density Fiberboards Produced with Recycled Fibers
Authors: Sala Conrad M. , Robles Eduardo , Kowaluk Grzegorz
Published: October 2020

The growing production of wood-based panels and the linked consumption result in a need for substituting standard wooden raw materials. The shortage of wood availability, as well as the increasing prices and a trend towards more environmentally friendly materials and processes, have encouraged the producers of wood-based products to consider extending the life cycle of wood composites. In the present work, the influence of substituting pine with spruce for industrial high-density fiberboards with 5% of recovered fibers was studied. Samples containing 0%, 25%, 50%, and 100% spruce fibers were tested in their mechanical resistance and their interaction with water. Boards from all samples met relevant standard requirements; however, the addition of spruce caused a decrease in mechanical properties, with homogeneity having the most significant influence. The modulus of rupture dropped up to 6% and the internal bond for 47% for samples having 50% of spruce. The most significant drop (50%) was observed for surface soundness for samples made with 100% spruce. Regarding physical properties, swelling increased up to 19% with 50% spruce; on the other hand, its water absorption decreased for up to 12%. The addition of spruce to industrial high-density fiberboards also influenced the formaldehyde content negatively, with an increase of up to 21% with 50% spruce.

Graphic Abstract
A fully coupled thermo-mechanical numerical modelling of the refill friction stir spot welding process in Alclad 7075-T6 aluminium alloy sheets
Authors: Kubit Andrzej , Trzepiecinski Tomasz
Published: October 2020

Refill friction stir spot welding (RFSSW) is a solid state joining technology that has the potential to replace processes such as the open-air fusion bonding technique and rivet technology in aerospace applications. Selection of proper RFSSW parameters is a crucial task which is important to ensure the mechanical strength of the joint. The aim of this paper is to undertake numerical modelling of the RFSSW process to understand the physics of the welding process, which involves large deformations, complex contact conditions and steep temperature gradients. Three-dimensional fully coupled thermo-mechanical models of RFSSW joints between Alclad 7075-T6 aluminium alloy sheets have been built in the finite-element-based program Simufact Forming. The simulation results included the temperature distribution and the stress and strain distributions in the overlap joint. The results of numerical computations have been compared with experimental ones. The numerical model was able to predict the mechanics of material flow during the joining of sheets of Alclad aluminium alloys using RFSSW. The predictions of the temperature gradient in the weld zone were in good agreement with the temperature measured experimentally. The numerical models that have been built are capable of simulating RFSSW to reduce the number of experiments required to set optimal welding parameters.
The effect of social feedback from peers on adolescent cognitive control
Authors: Hollarek Miriam , Lee Nikki C. , Krabbendam Lydia
Published: October 2020

Introduction

Social feedback can influence cognitive control during adolescence, particularly if provided by peers. The main aim of this study was to investigate if feedback given by liked or disliked peers differentially influenced adolescents' cognitive control. The second aim was to investigate if these effects could be linked to the participants’ social embeddedness in their classroom.

Methods

A personalized incentive go/no‐go task was administered to 45 early adolescents (M = 11.6 years, 25 male) and 68 late adolescents (M = 16.7, 38 male) in the Netherlands. Feedback was given after no‐go trials in two social feedback conditions (displaying a picture of a real liked or disliked classmate) and in a non‐social control condition.

Results

Performance on the task significantly improved with age. We found no differences between conditions in cognitive control, as measured by d‐prime. However, analysis of task speed revealed slower reaction times during the liked peer condition as compared to the disliked peer and the control condition, potentially suggesting that participants responded more cautiously, or alternatively that participants were more distracted. These effects did not differ between age groups. Participants’ differences in task performance were not reflected in their social embeddedness in the classroom.

Conclusions

This study shows that the same kind of social feedback can have different effects on adolescent behaviour depending on the peer delivering the feedback. It demonstrates the importance of studying the effects of real life social environments to better understand and utilize their impact on adolescent development.
Public Perception of General Surgery Resident Autonomy and Supervision
Authors: Dickinson Karen J. , Bass Barbara L. , Nguyen Duc T. , Graviss Edward A. , Pei Kevin Y.
Published: October 2020

BACKGROUND:

Despite patients being important stakeholders in surgical training, little is known about the public's perception of trainee participation in surgical care. This study evaluates the public's perception of surgical resident autonomy and supervision.

STUDY DESIGN:

An anonymous electronic survey was sent to adult panelists older than 18 years in the US using SurveyGizmo. The design of the survey used Dillman's Tailored Design Method to optimize response rate. Participants completed surveys including demographic characteristics and perceptions toward general surgery resident autonomy. Univariable and multivariable analyses were used as appropriate.

RESULTS:

Survey response rate was 93% (2,005 of 2,148). Demographic characteristics including age, gender, race or ethnicity, and highest level of education were nationally representative. Most respondents (87%) had health insurance. On multivariable logistic regression analysis, factors associated with participants who would never allow a resident to perform any portion of the operation include: female gender (odds ratio [OR] 1.58; 95% CI, 1.28 to 1.95), no health insurance (OR 1.38; 95% CI, 1.03 to 1.84), Black race (OR 1.82; 95% CI, 1.38 to 2.41), and Hispanic ethnicity (OR 1.49; 95% CI, 1.03 to 2.15). Participants who were younger than 50 years (OR 1.57; 95% CI, 1.24 to 1.98), male (OR 1.90; 95% CI, 1.56 to 2.32), of Black race (OR 1.45; 95% CI, 0.10 to 1.91), Hispanic ethnicity (OR 1.49; 95% CI, 1.05 to 2.11), working in healthcare (OR 2.18; 95% CI, 1.67 to 2.86), or insured (OR 1.46; 95% CI, 1.07 to 1.99) were more likely to believe that resident involvement increases complications.

CONCLUSIONS:

Among survey participants broadly representing the US population, resident participation in operations is not universally accepted. Public perception of surgical resident autonomy and supervision is important, as GME continues to evolve to address readiness for independent practice.
Geographic Coverage and Verification of Trauma Centers in a Rural State: Highlighting the Utility of Location Allocation for Trauma System Planning
Authors: Amato Stas S. , Benson Jamie S. , Murphy Serena , Osler Turner M. , Hosmer David , Cook Alan D. , Wolfson Daniel L. , Erb Andrew , Malhotra Ajai , An Gary
Published: October 2020

BACKGROUND:

Care at verified trauma centers has improved survival and functional outcomes, yet determining the appropriate location of potential trauma centers is often driven by factors other than optimizing system-level patient care. Given the importance of transport time in trauma, we analyzed trauma transport patterns in a rural state lacking an organized trauma system and implemented a geographic information system to inform potential future trauma center locations.

STUDY DESIGN:

Data were collected on trauma ground transport during a 3-year period (2014 through 2016) from the Statewide Incident Reporting Network database. Geographic information system mapping and location-allocation modeling of the best-fit facility for trauma center verification was computed using trauma transport patterns, population density, road network layout, and 60-minute emergency medical services transport time based on current transport protocols.

RESULTS:

Location-allocation modeling identified 2 regional facilities positioned to become the next verified trauma centers. The proportion of the Vermont population without access to trauma center care within 60 minutes would be reduced from the current 29.68% to 5.81% if the identified facilities become verified centers.

CONCLUSIONS:

Through geospatial mapping and location-allocation modeling, we were able to identify gaps and suggest optimal trauma center locations to maximize population coverage in a rural state lacking a formal, organized trauma system. These findings could inform future decision-making for targeted capacity improvement and system design that emphasizes more equitable access to trauma center care in Vermont.
Education Time Out and Debrief: Structured Implementation of Perioperative Resident Technical Education Discussion
Authors: Popat Shreeya , Hubbard Caroline , Mayer Wesley A. , Taylor Jennifer M.
Published: October 2020

BACKGROUND:

We designed a model for pre- and postoperative discussions between faculty and trainees to maximize educational yield of cases and accelerate residents' technical development. We sought to study its effect on surgical education via participant perceptions and longitudinal validated performance evaluations.

STUDY DESIGN:

Our model included preoperative collaborative technical goal-setting, specific to the resident, or “Time Out,” and immediate postoperative granular feedback guided by validated evaluation tools, or “Debrief.” We encouraged routine use for two 3-month rotations. We administered surveys with Likert scale and open-ended questions before and after implementation to assess adoption and perceptions. Likert scale survey data were analyzed using Mann-Whitney U tests; reported time durations were analyzed using t-tests. At 2 time points per rotation, designated faculty evaluated participating residents using the Objective Structured Assessment of Technical Skills (OSATS) for open/endoscopic cases or Global Evaluative Assessment of Robotic Skills (GEARS). OSATS and GEARS data were analyzed using paired t-tests.

RESULTS:

Before our intervention, we noted significant differences between attending and resident physicians' perceptions of the frequency, importance, and challenges of perioperative educational discussions. After our intervention, these disparities resolved. In addition, participants reported significantly improved satisfaction with pre- and postoperative educational discussions (p = 0.01). Use of the model did not require increased time per participants' report. Paired GEARS/OSATS were completed for 9 trainees during the intervention, with faculty ratings revealing significant improvement in resident technical skills (p = 0.03).

CONCLUSIONS:

Our structured model for perioperative educational discussions, consisting of the preoperative “Education Time Out” and postoperative “Education Debrief,” significantly improved faculty and resident satisfaction and was associated with measurable improvements in resident technical skills without requiring significantly more time.
Mid-Term Survival after Thoracic Endovascular Aortic Repair by Indication in the Medicare Population
Authors: Ho Vy T. , Itoga Nathan K. , Tran Kenneth , Lee Jason T. , Stern Jordan R.
Published: October 2020

BACKGROUND:

Thoracic endovascular aortic repair (TEVAR) is indicated for treatment of aneurysms, dissections, and traumatic injury. We describe mid-term mortality and reintervention rates in Medicare beneficiaries undergoing TEVAR.

STUDY DESIGN:

Patients who underwent TEVAR between 2006 and 2014 were identified by CPT codes in a 20% Medicare sample. Indication for aortic repair (aneurysm, dissection, trauma) was ascertained via ICD-9 codes. Follow-up was evaluated until 2015. Kaplan-Meier survival analysis and Cox regression were used to compare mortality, with reintervention and mortality rates expressed as a composite outcome in a hazard ratio with 95% confidence interval (hazard ratio [HR] 95% CI).

RESULTS:

There were 3,095 patients who underwent TEVAR during the study period: 1,465 (47%) for aneurysm, 1,448 (47%) for dissection, and 182 (5.9%) for trauma. Mean patient age was 74.4 years, and 44.5% were female. Median follow-up was 2.7 years. The overall 30-day, 1-year, and 5-year, and 8-year survival rates were 93%, 78%, 49%, and 33%, respectively. Thirty-day mortality was highest in traumatic indications, but overall mortality was highest in patients undergoing TEVAR for aneurysm. Freedom from combined reintervention and mortality at 30 days, 1 year, 5 years, and 8 years was 89%, 73%, 43%, and 29%, respectively. Reintervention was highest in patients undergoing TEVAR for dissection (12.8%), followed by aneurysm (10.0%) and trauma (5.5%). Advanced age (HR 1.03 per year, 95% CI 1.02–1.03), congestive heart failure (CHF) (HR 1.48, 95% CI 1.33–1.65), dementia (HR 1.40, 95% CI 1.14–1.28), and rupture (HR 1.38, 95% CI 1.24–1.54) were associated with mortality.

CONCLUSIONS:

Midterm survival is lower in patients who undergo TEVAR for dissection and aneurysm compared with trauma. Aneurysmal disease, advanced age, CHF, dementia, and aortic rupture are associated with mortality and reintervention in TEVAR.
Outpatient Mastectomy: Factors Influencing Patient Selection and Predictors of Return to Care
Authors: Vuong Brooke , Dusendang Jennifer R. , Chang Sharon B. , Mentakis Margaret Ann , Shim Veronica C. , Schmittdiel Julie , Kuehner Gillian
Published: October 2020

BACKGROUND:

After implementation of the Surgical Home Recovery (SHR) initiative for mastectomy within a large, integrated health delivery system, most patients are discharged on the day of the procedure. We sought to identify predictors of SHR and unplanned return to care (RTC).

STUDY DESIGN:

Mastectomy cases with and without reconstruction from October 2017 to August 2019 were analyzed. Patient characteristics, operative variables, and multimodal pain management were compared between admitted patients and SHR patients using logistic regression. We identified predictors of RTC in SHR patients, defined as 7-day readmission, reoperation, or emergency department visit.

RESULTS:

Of 2,648 mastectomies, 1,689 (64%) were outpatient procedures and the mean age of patients was 58.5 years. Predictors of SHR included perioperative IV acetaminophen (odds ratio [OR] 1.59; 95% CI, 1.28 to 1.97), perioperative opiates (OR 1.47; 95% CI, 1.06 to 2.02), and operation performed by a high-volume breast surgeon (OR 2.12; 95% CI, 1.42 to 3.18). Bilateral mastectomies (OR 0.70; 95% CI, 0.54 to 0.91), immediate reconstruction (OR 0.52; 95% CI, 0.39 to 0.70), and American Society of Anesthesiologists class 3 to 4 (OR 0.69; 95% CI, 0.54 to 0.87) decreased the odds of SHR. Of SHR patients, 111 of 1,689 patients (7%) experienced RTC. Patients with American Society of Anesthesiologists class 3 to 4 (OR 2.01; 95% CI, 1.29 to 3.14) and African American race (OR 2.30; 95% CI, 1.38 to 4.91) were more likely to RTC; receiving IV acetaminophen (OR 0.56; 95% CI, 0.35 to 0.88) and filling an opiate prescription (OR 0.51; 95% CI, 0.34 to 0.77) decreased the odds of RTC.

CONCLUSIONS:

Surgeon volume and multimodal pain medication increased the odds of SHR. Within the SHR group, American Society of Anesthesiologists Class 3 to 4 and African American patients increased the likelihood of RTC. This study helps optimize patient selection and perioperative practice for successful SHR.